diff options
Diffstat (limited to 'modules')
388 files changed, 76125 insertions, 0 deletions
diff --git a/modules/Makefile.am b/modules/Makefile.am new file mode 100644 index 00000000..c79f5957 --- /dev/null +++ b/modules/Makefile.am @@ -0,0 +1,16 @@ +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@thkukuk.de> +# + +SUBDIRS = pam_access pam_cracklib pam_debug pam_deny pam_echo \ + pam_env pam_filter pam_ftp pam_group pam_issue pam_keyinit \ + pam_lastlog pam_limits pam_listfile pam_localuser pam_mail \ + pam_mkhomedir pam_motd pam_nologin pam_permit pam_rhosts pam_rootok \ + pam_securetty pam_selinux pam_sepermit pam_shells pam_stress \ + pam_succeed_if pam_tally pam_time pam_tty_audit pam_umask \ + pam_unix pam_userdb pam_warn pam_wheel pam_xauth pam_exec \ + pam_namespace pam_loginuid pam_faildelay + +CLEANFILES = *~ + +EXTRA_DIST = modules.map diff --git a/modules/Makefile.in b/modules/Makefile.in new file mode 100644 index 00000000..1bd72c77 --- /dev/null +++ b/modules/Makefile.in @@ -0,0 +1,555 @@ +# Makefile.in generated by automake 1.10.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY, to the extent permitted by law; without +# even the implied warranty of MERCHANTABILITY or FITNESS FOR A +# PARTICULAR PURPOSE. + +@SET_MAKE@ + +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@thkukuk.de> +# +VPATH = @srcdir@ +pkgdatadir = $(datadir)/@PACKAGE@ +pkglibdir = $(libdir)/@PACKAGE@ +pkgincludedir = $(includedir)/@PACKAGE@ +am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd +install_sh_DATA = $(install_sh) -c -m 644 +install_sh_PROGRAM = $(install_sh) -c +install_sh_SCRIPT = $(install_sh) -c +INSTALL_HEADER = $(INSTALL_DATA) +transform = $(program_transform_name) +NORMAL_INSTALL = : +PRE_INSTALL = : +POST_INSTALL = : +NORMAL_UNINSTALL = : +PRE_UNINSTALL = : +POST_UNINSTALL = : +build_triplet = @build@ +host_triplet = @host@ +subdir = modules +DIST_COMMON = $(srcdir)/Makefile.am $(srcdir)/Makefile.in +ACLOCAL_M4 = $(top_srcdir)/aclocal.m4 +am__aclocal_m4_deps = $(top_srcdir)/m4/gettext.m4 \ + $(top_srcdir)/m4/iconv.m4 \ + $(top_srcdir)/m4/jh_path_xml_catalog.m4 \ + $(top_srcdir)/m4/ld-O1.m4 $(top_srcdir)/m4/ld-as-needed.m4 \ + $(top_srcdir)/m4/lib-ld.m4 $(top_srcdir)/m4/lib-link.m4 \ + $(top_srcdir)/m4/lib-prefix.m4 $(top_srcdir)/m4/libprelude.m4 \ + $(top_srcdir)/m4/nls.m4 $(top_srcdir)/m4/po.m4 \ + $(top_srcdir)/m4/progtest.m4 $(top_srcdir)/acinclude.m4 \ + $(top_srcdir)/configure.in +am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \ + $(ACLOCAL_M4) +mkinstalldirs = $(SHELL) $(top_srcdir)/mkinstalldirs +CONFIG_HEADER = $(top_builddir)/config.h +CONFIG_CLEAN_FILES = +SOURCES = +DIST_SOURCES = +RECURSIVE_TARGETS = all-recursive check-recursive dvi-recursive \ + html-recursive info-recursive install-data-recursive \ + install-dvi-recursive install-exec-recursive \ + install-html-recursive install-info-recursive \ + install-pdf-recursive install-ps-recursive install-recursive \ + installcheck-recursive installdirs-recursive pdf-recursive \ + ps-recursive uninstall-recursive +RECURSIVE_CLEAN_TARGETS = mostlyclean-recursive clean-recursive \ + distclean-recursive maintainer-clean-recursive +ETAGS = etags +CTAGS = ctags +DIST_SUBDIRS = $(SUBDIRS) +DISTFILES = $(DIST_COMMON) $(DIST_SOURCES) $(TEXINFOS) $(EXTRA_DIST) +ACLOCAL = @ACLOCAL@ +AMTAR = @AMTAR@ +AR = @AR@ +AUTOCONF = @AUTOCONF@ +AUTOHEADER = @AUTOHEADER@ +AUTOMAKE = @AUTOMAKE@ +AWK = @AWK@ +BROWSER = @BROWSER@ +CC = @CC@ +CCDEPMODE = @CCDEPMODE@ +CFLAGS = @CFLAGS@ +CPP = @CPP@ +CPPFLAGS = @CPPFLAGS@ +CXX = @CXX@ +CXXCPP = @CXXCPP@ +CXXDEPMODE = @CXXDEPMODE@ +CXXFLAGS = @CXXFLAGS@ +CYGPATH_W = @CYGPATH_W@ +DEFS = @DEFS@ +DEPDIR = @DEPDIR@ +DSYMUTIL = @DSYMUTIL@ +ECHO = @ECHO@ +ECHO_C = @ECHO_C@ +ECHO_N = @ECHO_N@ +ECHO_T = @ECHO_T@ +EGREP = @EGREP@ +EXEEXT = @EXEEXT@ +F77 = @F77@ +FFLAGS = @FFLAGS@ +FO2PDF = @FO2PDF@ +GMSGFMT = @GMSGFMT@ +GMSGFMT_015 = @GMSGFMT_015@ +GREP = @GREP@ +HAVE_KEY_MANAGEMENT = @HAVE_KEY_MANAGEMENT@ +INSTALL = @INSTALL@ +INSTALL_DATA = @INSTALL_DATA@ +INSTALL_PROGRAM = @INSTALL_PROGRAM@ +INSTALL_SCRIPT = @INSTALL_SCRIPT@ +INSTALL_STRIP_PROGRAM = @INSTALL_STRIP_PROGRAM@ +INTLLIBS = @INTLLIBS@ +INTL_MACOSX_LIBS = @INTL_MACOSX_LIBS@ +LDFLAGS = @LDFLAGS@ +LEX = @LEX@ +LEXLIB = @LEXLIB@ +LEX_OUTPUT_ROOT = @LEX_OUTPUT_ROOT@ +LIBAUDIT = @LIBAUDIT@ +LIBCRACK = @LIBCRACK@ +LIBCRYPT = @LIBCRYPT@ +LIBDB = @LIBDB@ +LIBDL = @LIBDL@ +LIBICONV = @LIBICONV@ +LIBINTL = @LIBINTL@ +LIBNSL = @LIBNSL@ +LIBOBJS = @LIBOBJS@ +LIBPRELUDE_CFLAGS = @LIBPRELUDE_CFLAGS@ +LIBPRELUDE_CONFIG = @LIBPRELUDE_CONFIG@ +LIBPRELUDE_CONFIG_PREFIX = @LIBPRELUDE_CONFIG_PREFIX@ +LIBPRELUDE_LDFLAGS = @LIBPRELUDE_LDFLAGS@ +LIBPRELUDE_LIBS = @LIBPRELUDE_LIBS@ +LIBPRELUDE_PREFIX = @LIBPRELUDE_PREFIX@ +LIBPRELUDE_PTHREAD_CFLAGS = @LIBPRELUDE_PTHREAD_CFLAGS@ +LIBS = @LIBS@ +LIBSELINUX = @LIBSELINUX@ +LIBTOOL = @LIBTOOL@ +LN_S = @LN_S@ +LTLIBICONV = @LTLIBICONV@ +LTLIBINTL = @LTLIBINTL@ +LTLIBOBJS = @LTLIBOBJS@ +MAKEINFO = @MAKEINFO@ +MKDIR_P = @MKDIR_P@ +MSGFMT = @MSGFMT@ +MSGFMT_015 = @MSGFMT_015@ +MSGMERGE = @MSGMERGE@ +NMEDIT = @NMEDIT@ +OBJEXT = @OBJEXT@ +PACKAGE = @PACKAGE@ +PACKAGE_BUGREPORT = @PACKAGE_BUGREPORT@ +PACKAGE_NAME = @PACKAGE_NAME@ +PACKAGE_STRING = @PACKAGE_STRING@ +PACKAGE_TARNAME = @PACKAGE_TARNAME@ +PACKAGE_VERSION = @PACKAGE_VERSION@ +PAM_READ_BOTH_CONFS = @PAM_READ_BOTH_CONFS@ +PATH_SEPARATOR = @PATH_SEPARATOR@ +PIE_CFLAGS = @PIE_CFLAGS@ +PIE_LDFLAGS = @PIE_LDFLAGS@ +POSUB = @POSUB@ +RANLIB = @RANLIB@ +SCONFIGDIR = @SCONFIGDIR@ +SECUREDIR = @SECUREDIR@ +SED = @SED@ +SET_MAKE = @SET_MAKE@ +SHELL = @SHELL@ +STRIP = @STRIP@ +USE_NLS = @USE_NLS@ +VERSION = @VERSION@ +WITH_DEBUG = @WITH_DEBUG@ +WITH_PAMLOCKING = @WITH_PAMLOCKING@ +XGETTEXT = @XGETTEXT@ +XGETTEXT_015 = @XGETTEXT_015@ +XMLCATALOG = @XMLCATALOG@ +XMLLINT = @XMLLINT@ +XML_CATALOG_FILE = @XML_CATALOG_FILE@ +XSLTPROC = @XSLTPROC@ +YACC = @YACC@ +YFLAGS = @YFLAGS@ +abs_builddir = @abs_builddir@ +abs_srcdir = @abs_srcdir@ +abs_top_builddir = @abs_top_builddir@ +abs_top_srcdir = @abs_top_srcdir@ +ac_ct_CC = @ac_ct_CC@ +ac_ct_CXX = @ac_ct_CXX@ +ac_ct_F77 = @ac_ct_F77@ +am__include = @am__include@ +am__leading_dot = @am__leading_dot@ +am__quote = @am__quote@ +am__tar = @am__tar@ +am__untar = @am__untar@ +bindir = @bindir@ +build = @build@ +build_alias = @build_alias@ +build_cpu = @build_cpu@ +build_os = @build_os@ +build_vendor = @build_vendor@ +builddir = @builddir@ +datadir = @datadir@ +datarootdir = @datarootdir@ +docdir = @docdir@ +dvidir = @dvidir@ +exec_prefix = @exec_prefix@ +host = @host@ +host_alias = @host_alias@ +host_cpu = @host_cpu@ +host_os = @host_os@ +host_vendor = @host_vendor@ +htmldir = @htmldir@ +includedir = @includedir@ +infodir = @infodir@ +install_sh = @install_sh@ +libc_cv_fpie = @libc_cv_fpie@ +libdir = @libdir@ +libexecdir = @libexecdir@ +localedir = @localedir@ +localstatedir = @localstatedir@ +mandir = @mandir@ +mkdir_p = @mkdir_p@ +oldincludedir = @oldincludedir@ +pam_cv_ld_as_needed = @pam_cv_ld_as_needed@ +pam_xauth_path = @pam_xauth_path@ +pdfdir = @pdfdir@ +prefix = @prefix@ +program_transform_name = @program_transform_name@ +psdir = @psdir@ +sbindir = @sbindir@ +sharedstatedir = @sharedstatedir@ +srcdir = @srcdir@ +sysconfdir = @sysconfdir@ +target_alias = @target_alias@ +top_builddir = @top_builddir@ +top_srcdir = @top_srcdir@ +SUBDIRS = pam_access pam_cracklib pam_debug pam_deny pam_echo \ + pam_env pam_filter pam_ftp pam_group pam_issue pam_keyinit \ + pam_lastlog pam_limits pam_listfile pam_localuser pam_mail \ + pam_mkhomedir pam_motd pam_nologin pam_permit pam_rhosts pam_rootok \ + pam_securetty pam_selinux pam_sepermit pam_shells pam_stress \ + pam_succeed_if pam_tally pam_time pam_tty_audit pam_umask \ + pam_unix pam_userdb pam_warn pam_wheel pam_xauth pam_exec \ + pam_namespace pam_loginuid pam_faildelay + +CLEANFILES = *~ +EXTRA_DIST = modules.map +all: all-recursive + +.SUFFIXES: +$(srcdir)/Makefile.in: $(srcdir)/Makefile.am $(am__configure_deps) + @for dep in $?; do \ + case '$(am__configure_deps)' in \ + *$$dep*) \ + cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh \ + && exit 0; \ + exit 1;; \ + esac; \ + done; \ + echo ' cd $(top_srcdir) && $(AUTOMAKE) --gnu modules/Makefile'; \ + cd $(top_srcdir) && \ + $(AUTOMAKE) --gnu modules/Makefile +.PRECIOUS: Makefile +Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status + @case '$?' in \ + *config.status*) \ + cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \ + *) \ + echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__depfiles_maybe)'; \ + cd $(top_builddir) && $(SHELL) ./config.status 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+ am__remove_distdir=: \ + am__skip_length_check=: \ + distdir) \ + || exit 1; \ + fi; \ + done +check-am: all-am +check: check-recursive +all-am: Makefile +installdirs: installdirs-recursive +installdirs-am: +install: install-recursive +install-exec: install-exec-recursive +install-data: install-data-recursive +uninstall: uninstall-recursive + +install-am: all-am + @$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am + +installcheck: installcheck-recursive +install-strip: + $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \ + install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \ + `test -z '$(STRIP)' || \ + echo "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'"` install +mostlyclean-generic: + +clean-generic: + -test -z "$(CLEANFILES)" || rm -f $(CLEANFILES) + +distclean-generic: + -test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES) + +maintainer-clean-generic: + @echo "This command is intended for maintainers to use" + @echo "it deletes 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$(RECURSIVE_CLEAN_TARGETS) $(RECURSIVE_TARGETS) CTAGS GTAGS \ + all all-am check check-am clean clean-generic clean-libtool \ + ctags ctags-recursive distclean distclean-generic \ + distclean-libtool distclean-tags distdir dvi dvi-am html \ + html-am info info-am install install-am install-data \ + install-data-am install-dvi install-dvi-am install-exec \ + install-exec-am install-html install-html-am install-info \ + install-info-am install-man install-pdf install-pdf-am \ + install-ps install-ps-am install-strip installcheck \ + installcheck-am installdirs installdirs-am maintainer-clean \ + maintainer-clean-generic mostlyclean mostlyclean-generic \ + mostlyclean-libtool pdf pdf-am ps ps-am tags tags-recursive \ + uninstall uninstall-am + +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/modules.map b/modules/modules.map new file mode 100644 index 00000000..2234aa40 --- /dev/null +++ b/modules/modules.map @@ -0,0 +1,11 @@ +{ + global: + pam_sm_acct_mgmt; + pam_sm_authenticate; + pam_sm_chauthtok; + pam_sm_close_session; + pam_sm_open_session; + pam_sm_setcred; + local: *; +}; + diff --git a/modules/pam_access/Makefile.am b/modules/pam_access/Makefile.am new file mode 100644 index 00000000..9b58e81e --- /dev/null +++ b/modules/pam_access/Makefile.am @@ -0,0 +1,37 @@ +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@thkukuk.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README access.conf $(MANS) $(XMLS) tst-pam_access + +man_MANS = access.conf.5 pam_access.8 + +XMLS = README.xml access.conf.5.xml pam_access.8.xml + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include \ + -DPAM_ACCESS_CONFIG=\"$(SCONFIGDIR)/access.conf\" +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_access.la +pam_access_la_LIBADD = -L$(top_builddir)/libpam -lpam @LIBNSL@ + +secureconf_DATA = access.conf + +if ENABLE_REGENERATE_MAN + +noinst_DATA = README + +README: pam_access.8.xml access.conf.5.xml + +-include $(top_srcdir)/Make.xml.rules +endif + +TESTS = tst-pam_access diff --git a/modules/pam_access/Makefile.in b/modules/pam_access/Makefile.in new file mode 100644 index 00000000..a75e4529 --- /dev/null +++ b/modules/pam_access/Makefile.in @@ -0,0 +1,740 @@ +# Makefile.in generated by automake 1.10.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY, to the extent permitted by law; without +# even the implied warranty of MERCHANTABILITY or FITNESS FOR A +# PARTICULAR PURPOSE. + +@SET_MAKE@ + +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@thkukuk.de> +# + + +VPATH = @srcdir@ +pkgdatadir = $(datadir)/@PACKAGE@ +pkglibdir = $(libdir)/@PACKAGE@ +pkgincludedir = $(includedir)/@PACKAGE@ +am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd +install_sh_DATA = $(install_sh) -c -m 644 +install_sh_PROGRAM = $(install_sh) -c +install_sh_SCRIPT = $(install_sh) -c +INSTALL_HEADER = $(INSTALL_DATA) +transform = $(program_transform_name) +NORMAL_INSTALL = : +PRE_INSTALL = : +POST_INSTALL = : +NORMAL_UNINSTALL = : +PRE_UNINSTALL = : +POST_UNINSTALL = : +build_triplet = @build@ +host_triplet = @host@ +@HAVE_VERSIONING_TRUE@am__append_1 = -Wl,--version-script=$(srcdir)/../modules.map +subdir = modules/pam_access +DIST_COMMON = README $(srcdir)/Makefile.am $(srcdir)/Makefile.in +ACLOCAL_M4 = $(top_srcdir)/aclocal.m4 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maintainer-clean-generic mostlyclean \ + mostlyclean-compile mostlyclean-generic mostlyclean-libtool \ + pdf pdf-am ps ps-am tags uninstall uninstall-am uninstall-man \ + uninstall-man5 uninstall-man8 uninstall-secureconfDATA \ + uninstall-securelibLTLIBRARIES + + +@ENABLE_REGENERATE_MAN_TRUE@README: pam_access.8.xml access.conf.5.xml + +@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_access/README b/modules/pam_access/README new file mode 100644 index 00000000..ec0d67e0 --- /dev/null +++ b/modules/pam_access/README @@ -0,0 +1,120 @@ +pam_access — PAM module for logdaemon style login access control + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +The pam_access PAM module is mainly for access management. It provides +logdaemon style login access control based on login names, host or domain +names, internet addresses or network numbers, or on terminal line names in case +of non-networked logins. + +By default rules for access management are taken from config file /etc/security +/access.conf if you don't specify another file. + +If Linux PAM is compiled with audit support the module will report when it +denies access based on origin (host or tty). + +OPTIONS + +accessfile=/path/to/access.conf + + Indicate an alternative access.conf style configuration file to override + the default. This can be useful when different services need different + access lists. + +debug + + A lot of debug informations are printed with syslog(3). + +noaudit + + Do not report logins from disallowed hosts and ttys to the audit subsystem. + +fieldsep=separators + + This option modifies the field separator character that pam_access will + recognize when parsing the access configuration file. For example: fieldsep + =| will cause the default `:' character to be treated as part of a field + value and `|' becomes the field separator. Doing this may be useful in + conjuction with a system that wants to use pam_access with X based + applications, since the PAM_TTY item is likely to be of the form + "hostname:0" which includes a `:' character in its value. But you should + not need this. + +listsep=separators + + This option modifies the list separator character that pam_access will + recognize when parsing the access configuration file. For example: listsep + =, will cause the default ` ' (space) and `\t' (tab) characters to be + treated as part of a list element value and `,' becomes the only list + element separator. Doing this may be useful on a system with group + information obtained from a Windows domain, where the default built-in + groups "Domain Users", "Domain Admins" contain a space. + +nodefgroup + + The group database will not be used for tokens not identified as account + name. + +EXAMPLES + +These are some example lines which might be specified in /etc/security/ +access.conf. + +User root should be allowed to get access via cron, X11 terminal :0, tty1, ..., +tty5, tty6. + ++ : root : crond :0 tty1 tty2 tty3 tty4 tty5 tty6 + +User root should be allowed to get access from hosts which own the IPv4 +addresses. This does not mean that the connection have to be a IPv4 one, a IPv6 +connection from a host with one of this IPv4 addresses does work, too. + ++ : root : 192.168.200.1 192.168.200.4 192.168.200.9 + ++ : root : 127.0.0.1 + +User root should get access from network 192.168.201. where the term will be +evaluated by string matching. But it might be better to use network/netmask +instead. The same meaning of 192.168.201. is 192.168.201.0/24 or 192.168.201.0/ +255.255.255.0. + ++ : root : 192.168.201. + +User root should be able to have access from hosts foo1.bar.org and +foo2.bar.org (uses string matching also). + ++ : root : foo1.bar.org foo2.bar.org + +User root should be able to have access from domain foo.bar.org (uses string +matching also). + ++ : root : .foo.bar.org + +User root should be denied to get access from all other sources. + +- : root : ALL + +User foo and members of netgroup admins should be allowed to get access from +all sources. This will only work if netgroup service is available. + ++ : @admins foo : ALL + +User john and foo should get access from IPv6 host address. + ++ : john foo : 2001:4ca0:0:101::1 + +User john should get access from IPv6 net/mask. + ++ : john : 2001:4ca0:0:101::/64 + +Disallow console logins to all but the shutdown, sync and all other accounts, +which are a member of the wheel group. + +-:ALL EXCEPT (wheel) shutdown sync:LOCAL + +All other users should be denied to get access from all sources. + +- : ALL : ALL + diff --git a/modules/pam_access/README.xml b/modules/pam_access/README.xml new file mode 100644 index 00000000..8c7d078b --- /dev/null +++ b/modules/pam_access/README.xml @@ -0,0 +1,39 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_access.8.xml"> +--> +<!-- +<!ENTITY accessconf SYSTEM "access.conf.5.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_access.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_access-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_access.8.xml" xpointer='xpointer(//refsect1[@id = "pam_access-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_access.8.xml" xpointer='xpointer(//refsect1[@id = "pam_access-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="access.conf.5.xml" xpointer='xpointer(//refsect1[@id = "access.conf-examples"]/*)'/> + </section> + +</article> diff --git a/modules/pam_access/access.conf b/modules/pam_access/access.conf new file mode 100644 index 00000000..74c5fbe8 --- /dev/null +++ b/modules/pam_access/access.conf @@ -0,0 +1,122 @@ +# Login access control table. +# +# Comment line must start with "#", no space at front. +# Order of lines is important. +# +# When someone logs in, the table is scanned for the first entry that +# matches the (user, host) combination, or, in case of non-networked +# logins, the first entry that matches the (user, tty) combination. The +# permissions field of that table entry determines whether the login will +# be accepted or refused. +# +# Format of the login access control table is three fields separated by a +# ":" character: +# +# [Note, if you supply a 'fieldsep=|' argument to the pam_access.so +# module, you can change the field separation character to be +# '|'. This is useful for configurations where you are trying to use +# pam_access with X applications that provide PAM_TTY values that are +# the display variable like "host:0".] +# +# permission : users : origins +# +# The first field should be a "+" (access granted) or "-" (access denied) +# character. +# +# The second field should be a list of one or more login names, group +# names, or ALL (always matches). A pattern of the form user@host is +# matched when the login name matches the "user" part, and when the +# "host" part matches the local machine name. +# +# The third field should be a list of one or more tty names (for +# non-networked logins), host names, domain names (begin with "."), host +# addresses, internet network numbers (end with "."), ALL (always +# matches), NONE (matches no tty on non-networked logins) or +# LOCAL (matches any string that does not contain a "." character). +# +# You can use @netgroupname in host or user patterns; this even works +# for @usergroup@@hostgroup patterns. +# +# The EXCEPT operator makes it possible to write very compact rules. +# +# The group file is searched only when a name does not match that of the +# logged-in user. Both the user's primary group is matched, as well as +# groups in which users are explicitly listed. +# To avoid problems with accounts, which have the same name as a group, +# you can use brackets around group names '(group)' to differentiate. +# In this case, you should also set the "nodefgroup" option. +# +# TTY NAMES: Must be in the form returned by ttyname(3) less the initial +# "/dev" (e.g. tty1 or vc/1) +# +############################################################################## +# +# Disallow non-root logins on tty1 +# +#-:ALL EXCEPT root:tty1 +# +# Disallow console logins to all but a few accounts. +# +#-:ALL EXCEPT wheel shutdown sync:LOCAL +# +# Same, but make sure that really the group wheel and not the user +# wheel is used (use nodefgroup argument, too): +# +#-:ALL EXCEPT (wheel) shutdown sync:LOCAL +# +# Disallow non-local logins to privileged accounts (group wheel). +# +#-:wheel:ALL EXCEPT LOCAL .win.tue.nl +# +# Some accounts are not allowed to login from anywhere: +# +#-:wsbscaro wsbsecr wsbspac wsbsym wscosor wstaiwde:ALL +# +# All other accounts are allowed to login from anywhere. +# +############################################################################## +# All lines from here up to the end are building a more complex example. +############################################################################## +# +# User "root" should be allowed to get access via cron .. tty5 tty6. +#+ : root : cron crond :0 tty1 tty2 tty3 tty4 tty5 tty6 +# +# User "root" should be allowed to get access from hosts with ip addresses. +#+ : root : 192.168.200.1 192.168.200.4 192.168.200.9 +#+ : root : 127.0.0.1 +# +# User "root" should get access from network 192.168.201. +# This term will be evaluated by string matching. +# comment: It might be better to use network/netmask instead. +# The same is 192.168.201.0/24 or 192.168.201.0/255.255.255.0 +#+ : root : 192.168.201. +# +# User "root" should be able to have access from domain. +# Uses string matching also. +#+ : root : .foo.bar.org +# +# User "root" should be denied to get access from all other sources. +#- : root : ALL +# +# User "foo" and members of netgroup "nis_group" should be +# allowed to get access from all sources. +# This will only work if netgroup service is available. +#+ : @nis_group foo : ALL +# +# User "john" should get access from ipv4 net/mask +#+ : john : 127.0.0.0/24 +# +# User "john" should get access from ipv4 as ipv6 net/mask +#+ : john : ::ffff:127.0.0.0/127 +# +# User "john" should get access from ipv6 host address +#+ : john : 2001:4ca0:0:101::1 +# +# User "john" should get access from ipv6 host address (same as above) +#+ : john : 2001:4ca0:0:101:0:0:0:1 +# +# User "john" should get access from ipv6 net/mask +#+ : john : 2001:4ca0:0:101::/64 +# +# All other users should be denied to get access from all sources. +#- : ALL : ALL diff --git a/modules/pam_access/access.conf.5 b/modules/pam_access/access.conf.5 new file mode 100644 index 00000000..4221ccfc --- /dev/null +++ b/modules/pam_access/access.conf.5 @@ -0,0 +1,170 @@ +.\" Title: access.conf +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "ACCESS\.CONF" "5" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +access.conf - the login access control table file +.SH "DESCRIPTION" +.PP +The +\fI/etc/security/access\.conf\fR +file specifies (\fIuser/group\fR, +\fIhost\fR), (\fIuser/group\fR, +\fInetwork/netmask\fR) or (\fIuser/group\fR, +\fItty\fR) combinations for which a login will be either accepted or refused\. +.PP +When someone logs in, the file +\fIaccess\.conf\fR +is scanned for the first entry that matches the (\fIuser/group\fR, +\fIhost\fR) or (\fIuser/group\fR, +\fInetwork/netmask\fR) combination, or, in case of non\-networked logins, the first entry that matches the (\fIuser/group\fR, +\fItty\fR) combination\. The permissions field of that table entry determines whether the login will be accepted or refused\. +.PP +Each line of the login access control table has three fields separated by a ":" character (colon): +.PP + +\fIpermission\fR:\fIusers/groups\fR:\fIorigins\fR +.PP +The first field, the +\fIpermission\fR +field, can be either a "\fI+\fR" character (plus) for access granted or a "\fI\-\fR" character (minus) for access denied\. +.PP +The second field, the +\fIusers\fR/\fIgroup\fR +field, should be a list of one or more login names, group names, or +\fIALL\fR +(which always matches)\. To differentiate user entries from group entries, group entries should be written with brackets, e\.g\. +\fI(group)\fR\. +.PP +The third field, the +\fIorigins\fR +field, should be a list of one or more tty names (for non\-networked logins), host names, domain names (begin with "\."), host addresses, internet network numbers (end with "\."), internet network addresses with network mask (where network mask can be a decimal number or an internet address also), +\fIALL\fR +(which always matches) or +\fILOCAL\fR +(which matches any string that does not contain a "\." character)\. If supported by the system you can use +\fI@netgroupname\fR +in host or user patterns\. +.PP +The +\fIEXCEPT\fR +operator makes it possible to write very compact rules\. +.PP +If the +\fBnodefgroup\fR +is not set, the group file is searched when a name does not match that of the logged\-in user\. Only groups are matched in which users are explicitly listed\. However the PAM module does not look at the primary group id of a user\. +.PP +The "\fI#\fR" character at start of line (no space at front) can be used to mark this line as a comment line\. +.SH "EXAMPLES" +.PP +These are some example lines which might be specified in +\fI/etc/security/access\.conf\fR\. +.PP +User +\fIroot\fR +should be allowed to get access via +\fIcron\fR, X11 terminal +\fI:0\fR, +\fItty1\fR, \.\.\., +\fItty5\fR, +\fItty6\fR\. +.PP ++ : root : crond :0 tty1 tty2 tty3 tty4 tty5 tty6 +.PP +User +\fIroot\fR +should be allowed to get access from hosts which own the IPv4 addresses\. This does not mean that the connection have to be a IPv4 one, a IPv6 connection from a host with one of this IPv4 addresses does work, too\. +.PP ++ : root : 192\.168\.200\.1 192\.168\.200\.4 192\.168\.200\.9 +.PP ++ : root : 127\.0\.0\.1 +.PP +User +\fIroot\fR +should get access from network +192\.168\.201\. +where the term will be evaluated by string matching\. But it might be better to use network/netmask instead\. The same meaning of +192\.168\.201\. +is +\fI192\.168\.201\.0/24\fR +or +\fI192\.168\.201\.0/255\.255\.255\.0\fR\. +.PP ++ : root : 192\.168\.201\. +.PP +User +\fIroot\fR +should be able to have access from hosts +\fIfoo1\.bar\.org\fR +and +\fIfoo2\.bar\.org\fR +(uses string matching also)\. +.PP ++ : root : foo1\.bar\.org foo2\.bar\.org +.PP +User +\fIroot\fR +should be able to have access from domain +\fIfoo\.bar\.org\fR +(uses string matching also)\. +.PP ++ : root : \.foo\.bar\.org +.PP +User +\fIroot\fR +should be denied to get access from all other sources\. +.PP +\- : root : ALL +.PP +User +\fIfoo\fR +and members of netgroup +\fIadmins\fR +should be allowed to get access from all sources\. This will only work if netgroup service is available\. +.PP ++ : @admins foo : ALL +.PP +User +\fIjohn\fR +and +\fIfoo\fR +should get access from IPv6 host address\. +.PP ++ : john foo : 2001:4ca0:0:101::1 +.PP +User +\fIjohn\fR +should get access from IPv6 net/mask\. +.PP ++ : john : 2001:4ca0:0:101::/64 +.PP +Disallow console logins to all but the shutdown, sync and all other accounts, which are a member of the wheel group\. +.PP +\-:ALL EXCEPT (wheel) shutdown sync:LOCAL +.PP +All other users should be denied to get access from all sources\. +.PP +\- : ALL : ALL +.SH "SEE ALSO" +.PP + +\fBpam_access\fR(8), +\fBpam.d\fR(5), +\fBpam\fR(8) +.SH "AUTHORS" +.PP +Original +\fBlogin.access\fR(5) +manual was provided by Guido van Rooij which was renamed to +\fBaccess.conf\fR(5) +to reflect relation to default config file\. +.PP +Network address / netmask description and example text was introduced by Mike Becher <mike\.becher@lrz\-muenchen\.de>\. diff --git a/modules/pam_access/access.conf.5.xml b/modules/pam_access/access.conf.5.xml new file mode 100644 index 00000000..f8eb7a4e --- /dev/null +++ b/modules/pam_access/access.conf.5.xml @@ -0,0 +1,203 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN" + "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd"> + +<refentry id="access.conf"> + + <refmeta> + <refentrytitle>access.conf</refentrytitle> + <manvolnum>5</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv> + <refname>access.conf</refname> + <refpurpose>the login access control table file</refpurpose> + </refnamediv> + + + <refsect1 id='access.conf-description'> + <title>DESCRIPTION</title> + <para> + The <filename>/etc/security/access.conf</filename> file specifies + (<replaceable>user/group</replaceable>, <replaceable>host</replaceable>), + (<replaceable>user/group</replaceable>, <replaceable>network/netmask</replaceable>) or + (<replaceable>user/group</replaceable>, <replaceable>tty</replaceable>) + combinations for which a login will be either accepted or refused. + </para> + <para> + When someone logs in, the file <filename>access.conf</filename> is + scanned for the first entry that matches the + (<replaceable>user/group</replaceable>, <replaceable>host</replaceable>) or + (<replaceable>user/group</replaceable>, <replaceable>network/netmask</replaceable>) + combination, or, in case of non-networked logins, the first entry + that matches the + (<replaceable>user/group</replaceable>, <replaceable>tty</replaceable>) + combination. The permissions field of that table entry determines + whether the login will be accepted or refused. + </para> + + <para> + Each line of the login access control table has three fields separated + by a ":" character (colon): + </para> + + <para> + <replaceable>permission</replaceable>:<replaceable>users/groups</replaceable>:<replaceable>origins</replaceable> + </para> + + + <para> + The first field, the <replaceable>permission</replaceable> field, can be either a + "<emphasis>+</emphasis>" character (plus) for access granted or a + "<emphasis>-</emphasis>" character (minus) for access denied. + </para> + + <para> + The second field, the + <replaceable>users</replaceable>/<replaceable>group</replaceable> + field, should be a list of one or more login names, group names, or + <emphasis>ALL</emphasis> (which always matches). To differentiate + user entries from group entries, group entries should be written + with brackets, e.g. <emphasis>(group)</emphasis>. + </para> + + <para> + The third field, the <replaceable>origins</replaceable> + field, should be a list of one or more tty names (for non-networked + logins), host names, domain names (begin with "."), host addresses, + internet network numbers (end with "."), internet network addresses + with network mask (where network mask can be a decimal number or an + internet address also), <emphasis>ALL</emphasis> (which always matches) + or <emphasis>LOCAL</emphasis> (which matches any string that does not + contain a "." character). If supported by the system you can use + <emphasis>@netgroupname</emphasis> in host or user patterns. + </para> + + <para> + The <replaceable>EXCEPT</replaceable> operator makes it possible to + write very compact rules. + </para> + + <para> + If the <option>nodefgroup</option> is not set, the group file + is searched when a name does not match that of the logged-in + user. Only groups are matched in which users are explicitly listed. + However the PAM module does not look at the primary group id of a user. + </para> + + + <para> + The "<emphasis>#</emphasis>" character at start of line (no space + at front) can be used to mark this line as a comment line. + </para> + + </refsect1> + + <refsect1 id="access.conf-examples"> + <title>EXAMPLES</title> + <para> + These are some example lines which might be specified in + <filename>/etc/security/access.conf</filename>. + </para> + + <para> + User <emphasis>root</emphasis> should be allowed to get access via + <emphasis>cron</emphasis>, X11 terminal <emphasis remap='I'>:0</emphasis>, + <emphasis>tty1</emphasis>, ..., <emphasis>tty5</emphasis>, + <emphasis>tty6</emphasis>. + </para> + <para>+ : root : crond :0 tty1 tty2 tty3 tty4 tty5 tty6</para> + + <para> + User <emphasis>root</emphasis> should be allowed to get access from + hosts which own the IPv4 addresses. This does not mean that the + connection have to be a IPv4 one, a IPv6 connection from a host with + one of this IPv4 addresses does work, too. + </para> + <para>+ : root : 192.168.200.1 192.168.200.4 192.168.200.9</para> + <para>+ : root : 127.0.0.1</para> + + <para> + User <emphasis>root</emphasis> should get access from network + <literal>192.168.201.</literal> where the term will be evaluated by + string matching. But it might be better to use network/netmask instead. + The same meaning of <literal>192.168.201.</literal> is + <emphasis>192.168.201.0/24</emphasis> or + <emphasis>192.168.201.0/255.255.255.0</emphasis>. + </para> + <para>+ : root : 192.168.201.</para> + + <para> + User <emphasis>root</emphasis> should be able to have access from hosts + <emphasis>foo1.bar.org</emphasis> and <emphasis>foo2.bar.org</emphasis> + (uses string matching also). + </para> + <para>+ : root : foo1.bar.org foo2.bar.org</para> + + <para> + User <emphasis>root</emphasis> should be able to have access from + domain <emphasis>foo.bar.org</emphasis> (uses string matching also). + </para> + <para>+ : root : .foo.bar.org</para> + + <para> + User <emphasis>root</emphasis> should be denied to get access + from all other sources. + </para> + <para>- : root : ALL</para> + + <para> + User <emphasis>foo</emphasis> and members of netgroup + <emphasis>admins</emphasis> should be allowed to get access + from all sources. This will only work if netgroup service is available. + </para> + <para>+ : @admins foo : ALL</para> + + <para> + User <emphasis>john</emphasis> and <emphasis>foo</emphasis> + should get access from IPv6 host address. + </para> + <para>+ : john foo : 2001:4ca0:0:101::1</para> + + <para> + User <emphasis>john</emphasis> should get access from IPv6 net/mask. + </para> + <para>+ : john : 2001:4ca0:0:101::/64</para> + + <para> + Disallow console logins to all but the shutdown, sync and all + other accounts, which are a member of the wheel group. + </para> + <para>-:ALL EXCEPT (wheel) shutdown sync:LOCAL</para> + + <para> + All other users should be denied to get access from all sources. + </para> + <para>- : ALL : ALL</para> + + </refsect1> + + <refsect1 id="access.conf-see_also"> + <title>SEE ALSO</title> + <para> + <citerefentry><refentrytitle>pam_access</refentrytitle><manvolnum>8</manvolnum></citerefentry>, + <citerefentry><refentrytitle>pam.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum></citerefentry> + </para> + </refsect1> + + <refsect1 id="access.conf-author"> + <title>AUTHORS</title> + <para> + Original <citerefentry><refentrytitle>login.access</refentrytitle><manvolnum>5</manvolnum></citerefentry> + manual was provided by Guido van Rooij which was renamed to + <citerefentry><refentrytitle>access.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry> + to reflect relation to default config file. + </para> + <para> + Network address / netmask description and example text was + introduced by Mike Becher <mike.becher@lrz-muenchen.de>. + </para> + </refsect1> +</refentry> diff --git a/modules/pam_access/pam_access.8 b/modules/pam_access/pam_access.8 new file mode 100644 index 00000000..ef907492 --- /dev/null +++ b/modules/pam_access/pam_access.8 @@ -0,0 +1,112 @@ +.\" Title: pam_access +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_ACCESS" "8" "04/16/2008" "Linux-PAM Manual" "Linux-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_access - PAM module for logdaemon style login access control +.SH "SYNOPSIS" +.HP 14 +\fBpam_access\.so\fR [debug] [nodefgroup] [noaudit] [accessfile=\fIfile\fR] [fieldsep=\fIsep\fR] [listsep=\fIsep\fR] +.SH "DESCRIPTION" +.PP +The pam_access PAM module is mainly for access management\. It provides logdaemon style login access control based on login names, host or domain names, internet addresses or network numbers, or on terminal line names in case of non\-networked logins\. +.PP +By default rules for access management are taken from config file +\fI/etc/security/access\.conf\fR +if you don\'t specify another file\. +.PP +If Linux PAM is compiled with audit support the module will report when it denies access based on origin (host or tty)\. +.SH "OPTIONS" +.PP +\fBaccessfile=\fR\fB\fI/path/to/access\.conf\fR\fR +.RS 4 +Indicate an alternative +\fIaccess\.conf\fR +style configuration file to override the default\. This can be useful when different services need different access lists\. +.RE +.PP +\fBdebug\fR +.RS 4 +A lot of debug informations are printed with +\fBsyslog\fR(3)\. +.RE +.PP +\fBnoaudit\fR +.RS 4 +Do not report logins from disallowed hosts and ttys to the audit subsystem\. +.RE +.PP +\fBfieldsep=\fR\fB\fIseparators\fR\fR +.RS 4 +This option modifies the field separator character that pam_access will recognize when parsing the access configuration file\. For example: +\fBfieldsep=|\fR +will cause the default `:\' character to be treated as part of a field value and `|\' becomes the field separator\. Doing this may be useful in conjuction with a system that wants to use pam_access with X based applications, since the +\fBPAM_TTY\fR +item is likely to be of the form "hostname:0" which includes a `:\' character in its value\. But you should not need this\. +.RE +.PP +\fBlistsep=\fR\fB\fIseparators\fR\fR +.RS 4 +This option modifies the list separator character that pam_access will recognize when parsing the access configuration file\. For example: +\fBlistsep=,\fR +will cause the default ` \' (space) and `\et\' (tab) characters to be treated as part of a list element value and `,\' becomes the only list element separator\. Doing this may be useful on a system with group information obtained from a Windows domain, where the default built\-in groups "Domain Users", "Domain Admins" contain a space\. +.RE +.PP +\fBnodefgroup\fR +.RS 4 +The group database will not be used for tokens not identified as account name\. +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +All services are supported\. +.SH "RETURN VALUES" +.PP +PAM_SUCCESS +.RS 4 +Access was granted\. +.RE +.PP +PAM_PERM_DENIED +.RS 4 +Access was not granted\. +.RE +.PP +PAM_IGNORE +.RS 4 + +\fBpam_setcred\fR +was called which does nothing\. +.RE +.PP +PAM_ABORT +.RS 4 +Not all relevant data or options could be gotten\. +.RE +.PP +PAM_USER_UNKNOWN +.RS 4 +The user is not known to the system\. +.RE +.SH "FILES" +.PP +\fI/etc/security/access\.conf\fR +.RS 4 +Default configuration file +.RE +.SH "SEE ALSO" +.PP + +\fBaccess.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8)\. +.SH "AUTHORS" +.PP +The logdaemon style login access control scheme was designed and implemented by Wietse Venema\. The pam_access PAM module was developed by Alexei Nogin <alexei@nogin\.dnttm\.ru>\. The IPv6 support and the network(address) / netmask feature was developed and provided by Mike Becher <mike\.becher@lrz\-muenchen\.de>\. diff --git a/modules/pam_access/pam_access.8.xml b/modules/pam_access/pam_access.8.xml new file mode 100644 index 00000000..21970d49 --- /dev/null +++ b/modules/pam_access/pam_access.8.xml @@ -0,0 +1,253 @@ +<?xml version="1.0" encoding="ISO-8859-1"?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN" + "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd"> + +<refentry id='pam_access'> + + <refmeta> + <refentrytitle>pam_access</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class='setdesc'>Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id='pam_access-name'> + <refname>pam_access</refname> + <refpurpose> + PAM module for logdaemon style login access control + </refpurpose> + </refnamediv> + +<!-- body begins here --> + + <refsynopsisdiv> + <cmdsynopsis id="pam_access-cmdsynopsis"> + <command>pam_access.so</command> + <arg choice="opt"> + debug + </arg> + <arg choice="opt"> + nodefgroup + </arg> + <arg choice="opt"> + noaudit + </arg> + <arg choice="opt"> + accessfile=<replaceable>file</replaceable> + </arg> + <arg choice="opt"> + fieldsep=<replaceable>sep</replaceable> + </arg> + <arg choice="opt"> + listsep=<replaceable>sep</replaceable> + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + + <refsect1 id="pam_access-description"> + <title>DESCRIPTION</title> + <para> + The pam_access PAM module is mainly for access management. + It provides logdaemon style login access control based on login + names, host or domain names, internet addresses or network numbers, + or on terminal line names in case of non-networked logins. + </para> + <para> + By default rules for access management are taken from config file + <filename>/etc/security/access.conf</filename> if you don't specify + another file. + </para> + <para> + If Linux PAM is compiled with audit support the module will report + when it denies access based on origin (host or tty). + </para> + </refsect1> + + <refsect1 id="pam_access-options"> + <title>OPTIONS</title> + <variablelist> + + <varlistentry> + <term> + <option>accessfile=<replaceable>/path/to/access.conf</replaceable></option> + </term> + <listitem> + <para> + Indicate an alternative <filename>access.conf</filename> + style configuration file to override the default. This can + be useful when different services need different access lists. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>debug</option> + </term> + <listitem> + <para> + A lot of debug informations are printed with + <citerefentry><refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum></citerefentry>. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>noaudit</option> + </term> + <listitem> + <para> + Do not report logins from disallowed hosts and ttys to the audit subsystem. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>fieldsep=<replaceable>separators</replaceable></option> + </term> + <listitem> + <para> + This option modifies the field separator character that + pam_access will recognize when parsing the access + configuration file. For example: + <emphasis remap='B'>fieldsep=|</emphasis> will cause the + default `:' character to be treated as part of a field value + and `|' becomes the field separator. Doing this may be + useful in conjuction with a system that wants to use + pam_access with X based applications, since the + <emphasis remap='B'>PAM_TTY</emphasis> item is likely to be + of the form "hostname:0" which includes a `:' character in + its value. But you should not need this. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>listsep=<replaceable>separators</replaceable></option> + </term> + <listitem> + <para> + This option modifies the list separator character that + pam_access will recognize when parsing the access + configuration file. For example: + <emphasis remap='B'>listsep=,</emphasis> will cause the + default ` ' (space) and `\t' (tab) characters to be treated + as part of a list element value and `,' becomes the only + list element separator. Doing this may be useful on a system + with group information obtained from a Windows domain, + where the default built-in groups "Domain Users", + "Domain Admins" contain a space. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>nodefgroup</option> + </term> + <listitem> + <para> + The group database will not be used for tokens not + identified as account name. + </para> + </listitem> + </varlistentry> + + </variablelist> + </refsect1> + + <refsect1 id="pam_access-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + All services are supported. + </para> + </refsect1> + + <refsect1 id="pam_access-return_values"> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + Access was granted. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_PERM_DENIED</term> + <listitem> + <para> + Access was not granted. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_IGNORE</term> + <listitem> + <para> + <function>pam_setcred</function> was called which does nothing. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_ABORT</term> + <listitem> + <para> + Not all relevant data or options could be gotten. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_USER_UNKNOWN</term> + <listitem> + <para> + The user is not known to the system. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_access-files"> + <title>FILES</title> + <variablelist> + <varlistentry> + <term><filename>/etc/security/access.conf</filename></term> + <listitem> + <para>Default configuration file</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_access-see_also"> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>access.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>. + </para> + </refsect1> + + <refsect1 id="pam_access-authors"> + <title>AUTHORS</title> + <para> + The logdaemon style login access control scheme was designed and implemented by + Wietse Venema. + The pam_access PAM module was developed by + Alexei Nogin <alexei@nogin.dnttm.ru>. + The IPv6 support and the network(address) / netmask feature + was developed and provided by Mike Becher <mike.becher@lrz-muenchen.de>. + </para> + </refsect1> +</refentry> diff --git a/modules/pam_access/pam_access.c b/modules/pam_access/pam_access.c new file mode 100644 index 00000000..edb8fb0a --- /dev/null +++ b/modules/pam_access/pam_access.c @@ -0,0 +1,922 @@ +/* pam_access module */ + +/* + * Written by Alexei Nogin <alexei@nogin.dnttm.ru> 1997/06/15 + * (I took login_access from logdaemon-5.6 and converted it to PAM + * using parts of pam_time code.) + * + ************************************************************************ + * Copyright message from logdaemon-5.6 (original file name DISCLAIMER) + ************************************************************************ + * Copyright 1995 by Wietse Venema. All rights reserved. Individual files + * may be covered by other copyrights (as noted in the file itself.) + * + * This material was originally written and compiled by Wietse Venema at + * Eindhoven University of Technology, The Netherlands, in 1990, 1991, + * 1992, 1993, 1994 and 1995. + * + * Redistribution and use in source and binary forms are permitted + * provided that this entire copyright notice is duplicated in all such + * copies. + * + * This software is provided "as is" and without any expressed or implied + * warranties, including, without limitation, the implied warranties of + * merchantibility and fitness for any particular purpose. + ************************************************************************* + */ + +#include "config.h" + +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> + +#include <stdarg.h> +#include <syslog.h> +#include <string.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <pwd.h> +#include <grp.h> +#include <errno.h> +#include <ctype.h> +#include <sys/utsname.h> +#include <rpcsvc/ypclnt.h> +#include <arpa/inet.h> +#include <netdb.h> +#include <sys/socket.h> + +#ifdef HAVE_LIBAUDIT +#include <libaudit.h> +#endif + +/* + * here, we make definitions for the externally accessible functions + * in this file (these definitions are required for static modules + * but strongly encouraged generally) they are used to instruct the + * modules include file to define their prototypes. + */ + +#define PAM_SM_AUTH +#define PAM_SM_ACCOUNT +#define PAM_SM_SESSION +#define PAM_SM_PASSWORD + +#include <security/_pam_macros.h> +#include <security/pam_modules.h> +#include <security/pam_modutil.h> +#include <security/pam_ext.h> + +/* login_access.c from logdaemon-5.6 with several changes by A.Nogin: */ + + /* + * This module implements a simple but effective form of login access + * control based on login names and on host (or domain) names, internet + * addresses (or network numbers), or on terminal line names in case of + * non-networked logins. Diagnostics are reported through syslog(3). + * + * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands. + */ + +#if !defined(MAXHOSTNAMELEN) || (MAXHOSTNAMELEN < 64) +#undef MAXHOSTNAMELEN +#define MAXHOSTNAMELEN 256 +#endif + + /* Delimiters for fields and for lists of users, ttys or hosts. */ + + +#define ALL 2 +#define YES 1 +#define NO 0 + + /* + * A structure to bundle up all login-related information to keep the + * functional interfaces as generic as possible. + */ +struct login_info { + const struct passwd *user; + const char *from; + const char *config_file; + int debug; /* Print debugging messages. */ + int only_new_group_syntax; /* Only allow group entries of the form "(xyz)" */ + int noaudit; /* Do not audit denials */ + const char *fs; /* field separator */ + const char *sep; /* list-element separator */ +}; + +/* Parse module config arguments */ + +static int +parse_args(pam_handle_t *pamh, struct login_info *loginfo, + int argc, const char **argv) +{ + int i; + + loginfo->noaudit = NO; + loginfo->debug = NO; + loginfo->only_new_group_syntax = NO; + loginfo->fs = ":"; + loginfo->sep = ", \t"; + for (i=0; i<argc; ++i) { + if (!strncmp("fieldsep=", argv[i], 9)) { + + /* the admin wants to override the default field separators */ + loginfo->fs = argv[i]+9; + + } else if (!strncmp("listsep=", argv[i], 8)) { + + /* the admin wants to override the default list separators */ + loginfo->sep = argv[i]+8; + + } else if (!strncmp("accessfile=", argv[i], 11)) { + FILE *fp = fopen(11 + argv[i], "r"); + + if (fp) { + loginfo->config_file = 11 + argv[i]; + fclose(fp); + } else { + pam_syslog(pamh, LOG_ERR, + "failed to open accessfile=[%s]: %m", 11 + argv[i]); + return 0; + } + + } else if (strcmp (argv[i], "debug") == 0) { + loginfo->debug = YES; + } else if (strcmp (argv[i], "nodefgroup") == 0) { + loginfo->only_new_group_syntax = YES; + } else if (strcmp (argv[i], "noaudit") == 0) { + loginfo->noaudit = YES; + } else { + pam_syslog(pamh, LOG_ERR, "unrecognized option [%s]", argv[i]); + } + } + + return 1; /* OK */ +} + +/* --- static functions for checking whether the user should be let in --- */ + +typedef int match_func (pam_handle_t *, char *, struct login_info *); + +static int list_match (pam_handle_t *, char *, char *, struct login_info *, + match_func *); +static int user_match (pam_handle_t *, char *, struct login_info *); +static int group_match (pam_handle_t *, const char *, const char *, int); +static int from_match (pam_handle_t *, char *, struct login_info *); +static int string_match (pam_handle_t *, const char *, const char *, int); +static int network_netmask_match (pam_handle_t *, const char *, const char *, int); + + +/* isipaddr - find out if string provided is an IP address or not */ + +static int +isipaddr (const char *string, int *addr_type, + struct sockaddr_storage *addr) +{ + struct sockaddr_storage local_addr; + int is_ip; + + /* We use struct sockaddr_storage addr because + * struct in_addr/in6_addr is an integral part + * of struct sockaddr and we doesn't want to + * use its value. + */ + + if (addr == NULL) + addr = &local_addr; + + memset(addr, 0, sizeof(struct sockaddr_storage)); + + /* first ipv4 */ + if (inet_pton(AF_INET, string, addr) > 0) + { + if (addr_type != NULL) + *addr_type = AF_INET; + + is_ip = YES; + } + else if (inet_pton(AF_INET6, string, addr) > 0) + { /* then ipv6 */ + if (addr_type != NULL) { + *addr_type = AF_INET6; + } + is_ip = YES; + } + else + is_ip = NO; + + return is_ip; +} + + +/* are_addresses_equal - translate IP address strings to real IP + * addresses and compare them to find out if they are equal. + * If netmask was provided it will be used to focus comparation to + * relevant bits. + */ +static int +are_addresses_equal (const char *ipaddr0, const char *ipaddr1, + const char *netmask) +{ + struct sockaddr_storage addr0; + struct sockaddr_storage addr1; + int addr_type0 = 0; + int addr_type1 = 0; + + if (isipaddr (ipaddr0, &addr_type0, &addr0) == NO) + return NO; + + if (isipaddr (ipaddr1, &addr_type1, &addr1) == NO) + return NO; + + if (addr_type0 != addr_type1) + /* different address types */ + return NO; + + if (netmask != NULL) { + /* Got a netmask, so normalize addresses? */ + struct sockaddr_storage nmask; + unsigned char *byte_a, *byte_nm; + + memset(&nmask, 0, sizeof(struct sockaddr_storage)); + if (inet_pton(addr_type0, netmask, (void *)&nmask) > 0) { + unsigned int i; + byte_a = (unsigned char *)(&addr0); + byte_nm = (unsigned char *)(&nmask); + for (i=0; i<sizeof(struct sockaddr_storage); i++) { + byte_a[i] = byte_a[i] & byte_nm[i]; + } + + byte_a = (unsigned char *)(&addr1); + byte_nm = (unsigned char *)(&nmask); + for (i=0; i<sizeof(struct sockaddr_storage); i++) { + byte_a[i] = byte_a[i] & byte_nm[i]; + } + } + } + + + /* Are the two addresses equal? */ + if (memcmp((void *)&addr0, (void *)&addr1, + sizeof(struct sockaddr_storage)) == 0) { + return(YES); + } + + return(NO); +} + +static char * +number_to_netmask (long netmask, int addr_type, + char *ipaddr_buf, size_t ipaddr_buf_len) +{ + /* We use struct sockaddr_storage addr because + * struct in_addr/in6_addr is an integral part + * of struct sockaddr and we doesn't want to + * use its value. + */ + struct sockaddr_storage nmask; + unsigned char *byte_nm; + const char *ipaddr_dst = NULL; + int i, ip_bytes; + + if (netmask == 0) { + /* mask 0 is the same like no mask */ + return(NULL); + } + + memset(&nmask, 0, sizeof(struct sockaddr_storage)); + if (addr_type == AF_INET6) { + /* ipv6 address mask */ + ip_bytes = 16; + } else { + /* default might be an ipv4 address mask */ + addr_type = AF_INET; + ip_bytes = 4; + } + + byte_nm = (unsigned char *)(&nmask); + /* translate number to mask */ + for (i=0; i<ip_bytes; i++) { + if (netmask >= 8) { + byte_nm[i] = 0xff; + netmask -= 8; + } else + if (netmask > 0) { + byte_nm[i] = 0xff << (8 - netmask); + break; + } else + if (netmask <= 0) { + break; + } + } + + /* now generate netmask address string */ + ipaddr_dst = inet_ntop(addr_type, &nmask, ipaddr_buf, ipaddr_buf_len); + if (ipaddr_dst == ipaddr_buf) { + return (ipaddr_buf); + } + + return (NULL); +} + +/* login_access - match username/group and host/tty with access control file */ + +static int +login_access (pam_handle_t *pamh, struct login_info *item) +{ + FILE *fp; + char line[BUFSIZ]; + char *perm; /* becomes permission field */ + char *users; /* becomes list of login names */ + char *froms; /* becomes list of terminals or hosts */ + int match = NO; + int nonall_match = NO; + int end; + int lineno = 0; /* for diagnostics */ + char *sptr; + + if (item->debug) + pam_syslog (pamh, LOG_DEBUG, + "login_access: user=%s, from=%s, file=%s", + item->user->pw_name, + item->from, item->config_file); + + /* + * Process the table one line at a time and stop at the first match. + * Blank lines and lines that begin with a '#' character are ignored. + * Non-comment lines are broken at the ':' character. All fields are + * mandatory. The first field should be a "+" or "-" character. A + * non-existing table means no access control. + */ + + if ((fp = fopen(item->config_file, "r"))!=NULL) { + while (!match && fgets(line, sizeof(line), fp)) { + lineno++; + if (line[end = strlen(line) - 1] != '\n') { + pam_syslog(pamh, LOG_ERR, + "%s: line %d: missing newline or line too long", + item->config_file, lineno); + continue; + } + if (line[0] == '#') + continue; /* comment line */ + while (end > 0 && isspace(line[end - 1])) + end--; + line[end] = 0; /* strip trailing whitespace */ + if (line[0] == 0) /* skip blank lines */ + continue; + + /* Allow field seperator in last field of froms */ + if (!(perm = strtok_r(line, item->fs, &sptr)) + || !(users = strtok_r(NULL, item->fs, &sptr)) + || !(froms = strtok_r(NULL, "\n", &sptr))) { + pam_syslog(pamh, LOG_ERR, "%s: line %d: bad field count", + item->config_file, lineno); + continue; + } + if (perm[0] != '+' && perm[0] != '-') { + pam_syslog(pamh, LOG_ERR, "%s: line %d: bad first field", + item->config_file, lineno); + continue; + } + if (item->debug) + pam_syslog (pamh, LOG_DEBUG, + "line %d: %s : %s : %s", lineno, perm, users, froms); + match = list_match(pamh, users, NULL, item, user_match); + if (item->debug) + pam_syslog (pamh, LOG_DEBUG, "user_match=%d, \"%s\"", + match, item->user->pw_name); + if (match) { + match = list_match(pamh, froms, NULL, item, from_match); + if (!match && perm[0] == '+') { + nonall_match = YES; + } + if (item->debug) + pam_syslog (pamh, LOG_DEBUG, + "from_match=%d, \"%s\"", match, item->from); + } + } + (void) fclose(fp); + } else if (errno == ENOENT) { + /* This is no error. */ + pam_syslog(pamh, LOG_WARNING, "warning: cannot open %s: %m", + item->config_file); + } else { + pam_syslog(pamh, LOG_ERR, "cannot open %s: %m", item->config_file); + return NO; + } +#ifdef HAVE_LIBAUDIT + if (!item->noaudit && line[0] == '-' && (match == YES || (match == ALL && + nonall_match == YES))) { + pam_modutil_audit_write(pamh, AUDIT_ANOM_LOGIN_LOCATION, + "pam_access", 0); + } +#endif + return (match == NO || (line[0] == '+')); +} + + +/* list_match - match an item against a list of tokens with exceptions */ + +static int +list_match(pam_handle_t *pamh, char *list, char *sptr, + struct login_info *item, match_func *match_fn) +{ + char *tok; + int match = NO; + + if (item->debug && list != NULL) + pam_syslog (pamh, LOG_DEBUG, + "list_match: list=%s, item=%s", list, item->user->pw_name); + + /* + * Process tokens one at a time. We have exhausted all possible matches + * when we reach an "EXCEPT" token or the end of the list. If we do find + * a match, look for an "EXCEPT" list and recurse to determine whether + * the match is affected by any exceptions. + */ + + for (tok = strtok_r(list, item->sep, &sptr); tok != 0; + tok = strtok_r(NULL, item->sep, &sptr)) { + if (strcasecmp(tok, "EXCEPT") == 0) /* EXCEPT: give up */ + break; + if ((match = (*match_fn) (pamh, tok, item))) /* YES */ + break; + } + /* Process exceptions to matches. */ + + if (match != NO) { + while ((tok = strtok_r(NULL, item->sep, &sptr)) && strcasecmp(tok, "EXCEPT")) + /* VOID */ ; + if (tok == 0) + return match; + if (list_match(pamh, NULL, sptr, item, match_fn) == NO) + return YES; /* drop special meaning of ALL */ + } + return (NO); +} + +/* myhostname - figure out local machine name */ + +static char *myhostname(void) +{ + static char name[MAXHOSTNAMELEN + 1]; + + if (gethostname(name, MAXHOSTNAMELEN) == 0) { + name[MAXHOSTNAMELEN] = 0; + return (name); + } + return NULL; +} + +/* netgroup_match - match group against machine or user */ + +static int +netgroup_match (pam_handle_t *pamh, const char *netgroup, + const char *machine, const char *user, int debug) +{ + char *mydomain = NULL; + int retval; + + yp_get_default_domain(&mydomain); + + + retval = innetgr (netgroup, machine, user, mydomain); + if (debug == YES) + pam_syslog (pamh, LOG_DEBUG, + "netgroup_match: %d (netgroup=%s, machine=%s, user=%s, domain=%s)", + retval, netgroup ? netgroup : "NULL", + machine ? machine : "NULL", + user ? user : "NULL", mydomain ? mydomain : "NULL"); + return retval; + +} + +/* user_match - match a username against one token */ + +static int +user_match (pam_handle_t *pamh, char *tok, struct login_info *item) +{ + char *string = item->user->pw_name; + struct login_info fake_item; + char *at; + int rv; + + if (item->debug) + pam_syslog (pamh, LOG_DEBUG, + "user_match: tok=%s, item=%s", tok, string); + + /* + * If a token has the magic value "ALL" the match always succeeds. + * Otherwise, return YES if the token fully matches the username, if the + * token is a group that contains the username, or if the token is the + * name of the user's primary group. + */ + + if ((at = strchr(tok + 1, '@')) != 0) { /* split user@host pattern */ + *at = 0; + fake_item.from = myhostname(); + if (fake_item.from == NULL) + return NO; + return (user_match (pamh, tok, item) && + from_match (pamh, at + 1, &fake_item)); + } else if (tok[0] == '@') /* netgroup */ + return (netgroup_match (pamh, tok + 1, (char *) 0, string, item->debug)); + else if (tok[0] == '(' && tok[strlen(tok) - 1] == ')') + return (group_match (pamh, tok, string, item->debug)); + else if ((rv=string_match (pamh, tok, string, item->debug)) != NO) /* ALL or exact match */ + return rv; + else if (item->only_new_group_syntax == NO && + pam_modutil_user_in_group_nam_nam (pamh, + item->user->pw_name, tok)) + /* try group membership */ + return YES; + + return NO; +} + + +/* group_match - match a username against token named group */ + +static int +group_match (pam_handle_t *pamh, const char *tok, const char* usr, + int debug) +{ + char grptok[BUFSIZ]; + + if (debug) + pam_syslog (pamh, LOG_DEBUG, + "group_match: grp=%s, user=%s", grptok, usr); + + if (strlen(tok) < 3) + return NO; + + /* token is recieved under the format '(...)' */ + memset(grptok, 0, BUFSIZ); + strncpy(grptok, tok + 1, strlen(tok) - 2); + + if (pam_modutil_user_in_group_nam_nam(pamh, usr, grptok)) + return YES; + + return NO; +} + + +/* from_match - match a host or tty against a list of tokens */ + +static int +from_match (pam_handle_t *pamh UNUSED, char *tok, struct login_info *item) +{ + const char *string = item->from; + int tok_len; + int str_len; + int rv; + + if (item->debug) + pam_syslog (pamh, LOG_DEBUG, + "from_match: tok=%s, item=%s", tok, string); + + /* + * If a token has the magic value "ALL" the match always succeeds. Return + * YES if the token fully matches the string. If the token is a domain + * name, return YES if it matches the last fields of the string. If the + * token has the magic value "LOCAL", return YES if the string does not + * contain a "." character. If the token is a network number, return YES + * if it matches the head of the string. + */ + + if (string == NULL) { + return NO; + } else if (tok[0] == '@') { /* netgroup */ + return (netgroup_match (pamh, tok + 1, string, (char *) 0, item->debug)); + } else if ((rv = string_match(pamh, tok, string, item->debug)) != NO) { + /* ALL or exact match */ + return rv; + } else if (tok[0] == '.') { /* domain: match last fields */ + if ((str_len = strlen(string)) > (tok_len = strlen(tok)) + && strcasecmp(tok, string + str_len - tok_len) == 0) + return (YES); + } else if (strcasecmp(tok, "LOCAL") == 0) { /* local: no dots */ + if (strchr(string, '.') == 0) + return (YES); + } else if (tok[(tok_len = strlen(tok)) - 1] == '.') { + struct addrinfo *res; + struct addrinfo hint; + + memset (&hint, '\0', sizeof (hint)); + hint.ai_flags = AI_CANONNAME; + hint.ai_family = AF_INET; + + if (getaddrinfo (string, NULL, &hint, &res) != 0) + return NO; + else + { + struct addrinfo *runp = res; + + while (runp != NULL) + { + char buf[INET_ADDRSTRLEN+2]; + + if (runp->ai_family == AF_INET) + { + inet_ntop (runp->ai_family, + &((struct sockaddr_in *) runp->ai_addr)->sin_addr, + buf, sizeof (buf)); + + strcat (buf, "."); + + if (strncmp(tok, buf, tok_len) == 0) + { + freeaddrinfo (res); + return YES; + } + } + runp = runp->ai_next; + } + freeaddrinfo (res); + } + } else if (isipaddr(string, NULL, NULL) == YES) { + /* Assume network/netmask with a IP of a host. */ + if (network_netmask_match(pamh, tok, string, item->debug)) + return YES; + } else { + /* Assume network/netmask with a name of a host. */ + struct addrinfo *res; + struct addrinfo hint; + + memset (&hint, '\0', sizeof (hint)); + hint.ai_flags = AI_CANONNAME; + hint.ai_family = AF_UNSPEC; + + if (getaddrinfo (string, NULL, &hint, &res) != 0) + return NO; + else + { + struct addrinfo *runp = res; + + while (runp != NULL) + { + char buf[INET6_ADDRSTRLEN]; + + inet_ntop (runp->ai_family, + runp->ai_family == AF_INET + ? (void *) &((struct sockaddr_in *) runp->ai_addr)->sin_addr + : (void *) &((struct sockaddr_in6 *) runp->ai_addr)->sin6_addr, + buf, sizeof (buf)); + + if (network_netmask_match(pamh, tok, buf, item->debug)) + { + freeaddrinfo (res); + return YES; + } + runp = runp->ai_next; + } + freeaddrinfo (res); + } + } + + return NO; +} + +/* string_match - match a string against one token */ + +static int +string_match (pam_handle_t *pamh, const char *tok, const char *string, + int debug) +{ + + if (debug) + pam_syslog (pamh, LOG_DEBUG, + "string_match: tok=%s, item=%s", tok, string); + + /* + * If the token has the magic value "ALL" the match always succeeds. + * Otherwise, return YES if the token fully matches the string. + * "NONE" token matches NULL string. + */ + + if (strcasecmp(tok, "ALL") == 0) { /* all: always matches */ + return (ALL); + } else if (string != NULL) { + if (strcasecmp(tok, string) == 0) { /* try exact match */ + return (YES); + } + } else if (strcasecmp(tok, "NONE") == 0) { + return (YES); + } + return (NO); +} + + +/* network_netmask_match - match a string against one token + * where string is an ip (v4,v6) address and tok represents + * whether a single ip (v4,v6) address or a network/netmask + */ +static int +network_netmask_match (pam_handle_t *pamh, + const char *tok, const char *string, int debug) +{ + if (debug) + pam_syslog (pamh, LOG_DEBUG, + "network_netmask_match: tok=%s, item=%s", tok, string); + + if (isipaddr(string, NULL, NULL) == YES) + { + char *netmask_ptr = NULL; + static char netmask_string[MAXHOSTNAMELEN + 1] = ""; + int addr_type; + + /* OK, check if tok is of type addr/mask */ + if ((netmask_ptr = strchr(tok, '/')) != NULL) + { + long netmask = 0; + + /* YES */ + *netmask_ptr = 0; + netmask_ptr++; + + if (isipaddr(tok, &addr_type, NULL) == NO) + { /* no netaddr */ + return(NO); + } + + /* check netmask */ + if (isipaddr(netmask_ptr, NULL, NULL) == NO) + { /* netmask as integre value */ + char *endptr = NULL; + netmask = strtol(netmask_ptr, &endptr, 0); + if ((endptr == NULL) || (*endptr != '\0')) + { /* invalid netmask value */ + return(NO); + } + if ((netmask < 0) || (netmask >= 128)) + { /* netmask value out of range */ + return(NO); + } + + netmask_ptr = number_to_netmask(netmask, addr_type, + netmask_string, MAXHOSTNAMELEN); + } + + /* Netmask is now an ipv4/ipv6 address. + * This works also if netmask_ptr is NULL. + */ + return (are_addresses_equal(string, tok, netmask_ptr)); + } + else + /* NO, then check if it is only an addr */ + if (isipaddr(tok, NULL, NULL) == YES) + { /* check if they are the same, no netmask */ + return(are_addresses_equal(string, tok, NULL)); + } + } + + return (NO); +} + + +/* --- public PAM management functions --- */ + +PAM_EXTERN int +pam_sm_authenticate (pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + struct login_info loginfo; + const char *user=NULL; + const void *void_from=NULL; + const char *from; + struct passwd *user_pw; + + /* set username */ + + if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS || user == NULL + || *user == '\0') { + pam_syslog(pamh, LOG_ERR, "cannot determine the user's name"); + return PAM_USER_UNKNOWN; + } + + if ((user_pw=pam_modutil_getpwnam(pamh, user))==NULL) + return (PAM_USER_UNKNOWN); + + /* + * Bundle up the arguments to avoid unnecessary clumsiness later on. + */ + loginfo.user = user_pw; + loginfo.config_file = PAM_ACCESS_CONFIG; + + /* parse the argument list */ + + if (!parse_args(pamh, &loginfo, argc, argv)) { + pam_syslog(pamh, LOG_ERR, "failed to parse the module arguments"); + return PAM_ABORT; + } + + /* remote host name */ + + if (pam_get_item(pamh, PAM_RHOST, &void_from) + != PAM_SUCCESS) { + pam_syslog(pamh, LOG_ERR, "cannot find the remote host name"); + return PAM_ABORT; + } + from = void_from; + + if ((from==NULL) || (*from=='\0')) { + + /* local login, set tty name */ + + if (pam_get_item(pamh, PAM_TTY, &void_from) != PAM_SUCCESS + || void_from == NULL) { + D(("PAM_TTY not set, probing stdin")); + from = ttyname(STDIN_FILENO); + if (from != NULL) { + if (pam_set_item(pamh, PAM_TTY, from) != PAM_SUCCESS) + pam_syslog(pamh, LOG_WARNING, "couldn't set tty name"); + } else { + if (pam_get_item(pamh, PAM_SERVICE, &void_from) != PAM_SUCCESS + || void_from == NULL) { + pam_syslog (pamh, LOG_ERR, + "cannot determine remote host, tty or service name"); + return PAM_ABORT; + } + from = void_from; + if (loginfo.debug) + pam_syslog (pamh, LOG_DEBUG, + "cannot determine tty or remote hostname, using service %s", + from); + } + } + else + from = void_from; + + if (from[0] == '/') { /* full path, remove device path. */ + const char *f; + from++; + if ((f = strchr(from, '/')) != NULL) { + from = f + 1; + } + } + } + + loginfo.from = from; + + if (login_access(pamh, &loginfo)) { + return (PAM_SUCCESS); + } else { + pam_syslog(pamh, LOG_ERR, + "access denied for user `%s' from `%s'",user,from); + return (PAM_PERM_DENIED); + } +} + +PAM_EXTERN int +pam_sm_setcred (pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_IGNORE; +} + +PAM_EXTERN int +pam_sm_acct_mgmt (pam_handle_t *pamh, int flags, + int argc, const char **argv) +{ + return pam_sm_authenticate (pamh, flags, argc, argv); +} + +PAM_EXTERN int +pam_sm_open_session(pam_handle_t *pamh, int flags, + int argc, const char **argv) +{ + return pam_sm_authenticate(pamh, flags, argc, argv); +} + +PAM_EXTERN int +pam_sm_close_session(pam_handle_t *pamh, int flags, + int argc, const char **argv) +{ + return pam_sm_authenticate(pamh, flags, argc, argv); +} + +PAM_EXTERN int +pam_sm_chauthtok(pam_handle_t *pamh, int flags, + int argc, const char **argv) +{ + return pam_sm_authenticate(pamh, flags, argc, argv); +} + +/* end of module definition */ + +#ifdef PAM_STATIC + +/* static module data */ + +struct pam_module _pam_access_modstruct = { + "pam_access", + pam_sm_authenticate, + pam_sm_setcred, + pam_sm_acct_mgmt, + pam_sm_open_session, + pam_sm_close_session, + pam_sm_chauthtok +}; +#endif diff --git a/modules/pam_access/tst-pam_access b/modules/pam_access/tst-pam_access new file mode 100755 index 00000000..271e69fe --- /dev/null +++ b/modules/pam_access/tst-pam_access @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_access.so diff --git a/modules/pam_cracklib/Makefile.am b/modules/pam_cracklib/Makefile.am new file mode 100644 index 00000000..619ffc93 --- /dev/null +++ b/modules/pam_cracklib/Makefile.am @@ -0,0 +1,38 @@ +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README $(MANS) $(XMLS) tst-pam_cracklib + +man_MANS = pam_cracklib.8 + +XMLS = README.xml pam_cracklib.8.xml + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += 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install-strip + +.PHONY: CTAGS GTAGS all all-am check check-TESTS check-am clean \ + clean-generic clean-libtool clean-securelibLTLIBRARIES ctags \ + distclean distclean-compile distclean-generic \ + distclean-libtool distclean-tags distdir dvi dvi-am html \ + html-am info info-am install install-am install-data \ + install-data-am install-dvi install-dvi-am install-exec \ + install-exec-am install-html install-html-am install-info \ + install-info-am install-man install-man8 install-pdf \ + install-pdf-am install-ps install-ps-am \ + install-securelibLTLIBRARIES install-strip installcheck \ + installcheck-am installdirs maintainer-clean \ + maintainer-clean-generic mostlyclean mostlyclean-compile \ + mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \ + tags uninstall uninstall-am uninstall-man uninstall-man8 \ + uninstall-securelibLTLIBRARIES + + +@ENABLE_REGENERATE_MAN_TRUE@README: pam_cracklib.8.xml + +@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_cracklib/README b/modules/pam_cracklib/README new file mode 100644 index 00000000..25ec00b4 --- /dev/null +++ b/modules/pam_cracklib/README @@ -0,0 +1,220 @@ +pam_cracklib — PAM module to check the password against dictionary words + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +This module can be plugged into the password stack of a given application to +provide some plug-in strength-checking for passwords. + +The action of this module is to prompt the user for a password and check its +strength against a system dictionary and a set of rules for identifying poor +choices. + +The first action is to prompt for a single password, check its strength and +then, if it is considered strong, prompt for the password a second time (to +verify that it was typed correctly on the first occasion). All being well, the +password is passed on to subsequent modules to be installed as the new +authentication token. + +The strength checks works in the following manner: at first the Cracklib +routine is called to check if the password is part of a dictionary; if this is +not the case an additional set of strength checks is done. These checks are: + +Palindrome + + Is the new password a palindrome of the old one? + +Case Change Only + + Is the new password the the old one with only a change of case? + +Similar + + Is the new password too much like the old one? This is primarily controlled + by one argument, difok which is a number of characters that if different + between the old and new are enough to accept the new password, this + defaults to 10 or 1/2 the size of the new password whichever is smaller. + + To avoid the lockup associated with trying to change a long and complicated + password, difignore is available. This argument can be used to specify the + minimum length a new password needs to be before the difok value is + ignored. The default value for difignore is 23. + +Simple + + Is the new password too small? This is controlled by 5 arguments minlen, + dcredit, ucredit, lcredit, and ocredit. See the section on the arguments + for the details of how these work and there defaults. + +Rotated + + Is the new password a rotated version of the old password? + +Already used + + Was the password used in the past? Previously used passwords are to be + found in /etc/security/opasswd. + +This module with no arguments will work well for standard unix password +encryption. With md5 encryption, passwords can be longer than 8 characters and +the default settings for this module can make it hard for the user to choose a +satisfactory new password. Notably, the requirement that the new password +contain no more than 1/2 of the characters in the old password becomes a +non-trivial constraint. For example, an old password of the form "the quick +brown fox jumped over the lazy dogs" would be difficult to change... In +addition, the default action is to allow passwords as small as 5 characters in +length. For a md5 systems it can be a good idea to increase the required +minimum size of a password. One can then allow more credit for different kinds +of characters but accept that the new password may share most of these +characters with the old password. + +OPTIONS + +debug + + This option makes the module write information to syslog(3) indicating the + behavior of the module (this option does not write password information to + the log file). + +type=XXX + + The default action is for the module to use the following prompts when + requesting passwords: "New UNIX password: " and "Retype UNIX password: ". + The default word UNIX can be replaced with this option. + +retry=N + + Prompt user at most N times before returning with error. The default is 1 + +difok=N + + This argument will change the default of 5 for the number of characters in + the new password that must not be present in the old password. In addition, + if 1/2 of the characters in the new password are different then the new + password will be accepted anyway. + +difignore=N + + How many characters should the password have before difok will be ignored. + The default is 23. + +minlen=N + + The minimum acceptable size for the new password (plus one if credits are + not disabled which is the default). In addition to the number of characters + in the new password, credit (of +1 in length) is given for each different + kind of character (other, upper, lower and digit). The default for this + parameter is 9 which is good for a old style UNIX password all of the same + type of character but may be too low to exploit the added security of a md5 + system. Note that there is a pair of length limits in Cracklib itself, a + "way too short" limit of 4 which is hard coded in and a defined limit (6) + that will be checked without reference to minlen. If you want to allow + passwords as short as 5 characters you should not use this module. + +dcredit=N + + (N >= 0) This is the maximum credit for having digits in the new password. + If you have less than or N digits, each digit will count +1 towards meeting + the current minlen value. The default for dcredit is 1 which is the + recommended value for minlen less than 10. + + (N < 0) This is the minimum number of digits that must be met for a new + password. + +ucredit=N + + (N >= 0) This is the maximum credit for having upper case letters in the + new password. If you have less than or N upper case letters each letter + will count +1 towards meeting the current minlen value. The default for + ucredit is 1 which is the recommended value for minlen less than 10. + + (N > 0) This is the minimum number of upper case letters that must be met + for a new password. + +lcredit=N + + (N >= 0) This is the maximum credit for having lower case letters in the + new password. If you have less than or N lower case letters, each letter + will count +1 towards meeting the current minlen value. The default for + lcredit is 1 which is the recommended value for minlen less than 10. + + (N < 0) This is the minimum number of lower case letters that must be met + for a new password. + +ocredit=N + + (N >= 0) This is the maximum credit for having other characters in the new + password. If you have less than or N other characters, each character will + count +1 towards meeting the current minlen value. The default for ocredit + is 1 which is the recommended value for minlen less than 10. + + (N < 0) This is the minimum number of other characters that must be met for + a new password. + +minclass=N + + The minimum number of required classes of characters for the new password. + The default number is zero. The four classes are digits, upper and lower + letters and other characters. The difference to the credit check is that a + specific class if of characters is not required. Instead N out of four of + the classes are required. + +use_authtok + + This argument is used to force the module to not prompt the user for a new + password but use the one provided by the previously stacked password + module. + +dictpath=/path/to/dict + + Path to the cracklib dictionaries. + +EXAMPLES + +For an example of the use of this module, we show how it may be stacked with +the password component of pam_unix(8) + +# +# These lines stack two password type modules. In this example the +# user is given 3 opportunities to enter a strong password. The +# "use_authtok" argument ensures that the pam_unix module does not +# prompt for a password, but instead uses the one provided by +# pam_cracklib. +# +passwd password required pam_cracklib.so retry=3 +passwd password required pam_unix.so use_authtok + + +Another example (in the /etc/pam.d/passwd format) is for the case that you want +to use md5 password encryption: + +#%PAM-1.0 +# +# These lines allow a md5 systems to support passwords of at least 14 +# bytes with extra credit of 2 for digits and 2 for others the new +# password must have at least three bytes that are not present in the +# old password +# +password required pam_cracklib.so \ + difok=3 minlen=15 dcredit= 2 ocredit=2 +password required pam_unix.so use_authtok nullok md5 + + +And here is another example in case you don't want to use credits: + +#%PAM-1.0 +# +# These lines require the user to select a password with a minimum +# length of 8 and with at least 1 digit number, 1 upper case letter, +# and 1 other character +# +password required pam_cracklib.so \ + dcredit=-1 ucredit=-1 ocredit=-1 lcredit=0 minlen=8 +password required pam_unix.so use_authtok nullok md5 + + +AUTHOR + +pam_cracklib was written by Cristian Gafton <gafton@redhat.com> + diff --git a/modules/pam_cracklib/README.xml b/modules/pam_cracklib/README.xml new file mode 100644 index 00000000..c4a7b54c --- /dev/null +++ b/modules/pam_cracklib/README.xml @@ -0,0 +1,41 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_cracklib.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_cracklib.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_cracklib-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_cracklib.8.xml" xpointer='xpointer(//refsect1[@id = "pam_cracklib-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_cracklib.8.xml" xpointer='xpointer(//refsect1[@id = "pam_cracklib-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_cracklib.8.xml" xpointer='xpointer(//refsect1[@id = "pam_cracklib-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_cracklib.8.xml" xpointer='xpointer(//refsect1[@id = "pam_cracklib-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_cracklib/pam_cracklib.8 b/modules/pam_cracklib/pam_cracklib.8 new file mode 100644 index 00000000..b772f747 --- /dev/null +++ b/modules/pam_cracklib/pam_cracklib.8 @@ -0,0 +1,309 @@ +.\" Title: pam_cracklib +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_CRACKLIB" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_cracklib - PAM module to check the password against dictionary words +.SH "SYNOPSIS" +.HP 16 +\fBpam_cracklib\.so\fR [\fI\.\.\.\fR] +.SH "DESCRIPTION" +.PP +This module can be plugged into the +\fIpassword\fR +stack of a given application to provide some plug\-in strength\-checking for passwords\. +.PP +The action of this module is to prompt the user for a password and check its strength against a system dictionary and a set of rules for identifying poor choices\. +.PP +The first action is to prompt for a single password, check its strength and then, if it is considered strong, prompt for the password a second time (to verify that it was typed correctly on the first occasion)\. All being well, the password is passed on to subsequent modules to be installed as the new authentication token\. +.PP +The strength checks works in the following manner: at first the +\fBCracklib\fR +routine is called to check if the password is part of a dictionary; if this is not the case an additional set of strength checks is done\. These checks are: +.PP +Palindrome +.RS 4 +Is the new password a palindrome of the old one? +.RE +.PP +Case Change Only +.RS 4 +Is the new password the the old one with only a change of case? +.RE +.PP +Similar +.RS 4 +Is the new password too much like the old one? This is primarily controlled by one argument, +\fBdifok\fR +which is a number of characters that if different between the old and new are enough to accept the new password, this defaults to 10 or 1/2 the size of the new password whichever is smaller\. +.sp +To avoid the lockup associated with trying to change a long and complicated password, +\fBdifignore\fR +is available\. This argument can be used to specify the minimum length a new password needs to be before the +\fBdifok\fR +value is ignored\. The default value for +\fBdifignore\fR +is 23\. +.RE +.PP +Simple +.RS 4 +Is the new password too small? This is controlled by 5 arguments +\fBminlen\fR, +\fBdcredit\fR, +\fBucredit\fR, +\fBlcredit\fR, and +\fBocredit\fR\. See the section on the arguments for the details of how these work and there defaults\. +.RE +.PP +Rotated +.RS 4 +Is the new password a rotated version of the old password? +.RE +.PP +Already used +.RS 4 +Was the password used in the past? Previously used passwords are to be found in +\fI/etc/security/opasswd\fR\. +.RE +.PP +This module with no arguments will work well for standard unix password encryption\. With md5 encryption, passwords can be longer than 8 characters and the default settings for this module can make it hard for the user to choose a satisfactory new password\. Notably, the requirement that the new password contain no more than 1/2 of the characters in the old password becomes a non\-trivial constraint\. For example, an old password of the form "the quick brown fox jumped over the lazy dogs" would be difficult to change\.\.\. In addition, the default action is to allow passwords as small as 5 characters in length\. For a md5 systems it can be a good idea to increase the required minimum size of a password\. One can then allow more credit for different kinds of characters but accept that the new password may share most of these characters with the old password\. +.SH "OPTIONS" +.PP +.PP +\fBdebug\fR +.RS 4 +This option makes the module write information to +\fBsyslog\fR(3) +indicating the behavior of the module (this option does not write password information to the log file)\. +.RE +.PP +\fBtype=\fR\fB\fIXXX\fR\fR +.RS 4 +The default action is for the module to use the following prompts when requesting passwords: "New UNIX password: " and "Retype UNIX password: "\. The default word +\fIUNIX\fR +can be replaced with this option\. +.RE +.PP +\fBretry=\fR\fB\fIN\fR\fR +.RS 4 +Prompt user at most +\fIN\fR +times before returning with error\. The default is +\fI1\fR +.RE +.PP +\fBdifok=\fR\fB\fIN\fR\fR +.RS 4 +This argument will change the default of +\fI5\fR +for the number of characters in the new password that must not be present in the old password\. In addition, if 1/2 of the characters in the new password are different then the new password will be accepted anyway\. +.RE +.PP +\fBdifignore=\fR\fB\fIN\fR\fR +.RS 4 +How many characters should the password have before difok will be ignored\. The default is +\fI23\fR\. +.RE +.PP +\fBminlen=\fR\fB\fIN\fR\fR +.RS 4 +The minimum acceptable size for the new password (plus one if credits are not disabled which is the default)\. In addition to the number of characters in the new password, credit (of +1 in length) is given for each different kind of character (\fIother\fR, +\fIupper\fR, +\fIlower\fR +and +\fIdigit\fR)\. The default for this parameter is +\fI9\fR +which is good for a old style UNIX password all of the same type of character but may be too low to exploit the added security of a md5 system\. Note that there is a pair of length limits in +\fICracklib\fR +itself, a "way too short" limit of 4 which is hard coded in and a defined limit (6) that will be checked without reference to +\fBminlen\fR\. If you want to allow passwords as short as 5 characters you should not use this module\. +.RE +.PP +\fBdcredit=\fR\fB\fIN\fR\fR +.RS 4 +(N >= 0) This is the maximum credit for having digits in the new password\. If you have less than or +\fIN\fR +digits, each digit will count +1 towards meeting the current +\fBminlen\fR +value\. The default for +\fBdcredit\fR +is 1 which is the recommended value for +\fBminlen\fR +less than 10\. +.sp +(N < 0) This is the minimum number of digits that must be met for a new password\. +.RE +.PP +\fBucredit=\fR\fB\fIN\fR\fR +.RS 4 +(N >= 0) This is the maximum credit for having upper case letters in the new password\. If you have less than or +\fIN\fR +upper case letters each letter will count +1 towards meeting the current +\fBminlen\fR +value\. The default for +\fBucredit\fR +is +\fI1\fR +which is the recommended value for +\fBminlen\fR +less than 10\. +.sp +(N > 0) This is the minimum number of upper case letters that must be met for a new password\. +.RE +.PP +\fBlcredit=\fR\fB\fIN\fR\fR +.RS 4 +(N >= 0) This is the maximum credit for having lower case letters in the new password\. If you have less than or +\fIN\fR +lower case letters, each letter will count +1 towards meeting the current +\fBminlen\fR +value\. The default for +\fBlcredit\fR +is 1 which is the recommended value for +\fBminlen\fR +less than 10\. +.sp +(N < 0) This is the minimum number of lower case letters that must be met for a new password\. +.RE +.PP +\fBocredit=\fR\fB\fIN\fR\fR +.RS 4 +(N >= 0) This is the maximum credit for having other characters in the new password\. If you have less than or +\fIN\fR +other characters, each character will count +1 towards meeting the current +\fBminlen\fR +value\. The default for +\fBocredit\fR +is 1 which is the recommended value for +\fBminlen\fR +less than 10\. +.sp +(N < 0) This is the minimum number of other characters that must be met for a new password\. +.RE +.PP +\fBminclass=\fR\fB\fIN\fR\fR +.RS 4 +The minimum number of required classes of characters for the new password\. The default number is zero\. The four classes are digits, upper and lower letters and other characters\. The difference to the +\fBcredit\fR +check is that a specific class if of characters is not required\. Instead +\fIN\fR +out of four of the classes are required\. +.RE +.PP +\fBuse_authtok\fR +.RS 4 +This argument is used to +\fIforce\fR +the module to not prompt the user for a new password but use the one provided by the previously stacked +\fIpassword\fR +module\. +.RE +.PP +\fBdictpath=\fR\fB\fI/path/to/dict\fR\fR +.RS 4 +Path to the cracklib dictionaries\. +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +Only he +\fBpassword\fR +service is supported\. +.SH "RETURN VALUES" +.PP +.PP +PAM_SUCCESS +.RS 4 +The new password passes all checks\. +.RE +.PP +PAM_AUTHTOK_ERR +.RS 4 +No new password was entered, the username could not be determined or the new password fails the strength checks\. +.RE +.PP +PAM_AUTHTOK_RECOVERY_ERR +.RS 4 +The old password was not supplied by a previous stacked module or got not requested from the user\. The first error can happen if +\fBuse_authtok\fR +is specified\. +.RE +.PP +PAM_SERVICE_ERR +.RS 4 +A internal error occured\. +.RE +.SH "EXAMPLES" +.PP +For an example of the use of this module, we show how it may be stacked with the password component of +\fBpam_unix\fR(8) +.sp +.RS 4 +.nf +# +# These lines stack two password type modules\. In this example the +# user is given 3 opportunities to enter a strong password\. The +# "use_authtok" argument ensures that the pam_unix module does not +# prompt for a password, but instead uses the one provided by +# pam_cracklib\. +# +passwd password required pam_cracklib\.so retry=3 +passwd password required pam_unix\.so use_authtok + +.fi +.RE +.PP +Another example (in the +\fI/etc/pam\.d/passwd\fR +format) is for the case that you want to use md5 password encryption: +.sp +.RS 4 +.nf +#%PAM\-1\.0 +# +# These lines allow a md5 systems to support passwords of at least 14 +# bytes with extra credit of 2 for digits and 2 for others the new +# password must have at least three bytes that are not present in the +# old password +# +password required pam_cracklib\.so \e + difok=3 minlen=15 dcredit= 2 ocredit=2 +password required pam_unix\.so use_authtok nullok md5 + +.fi +.RE +.PP +And here is another example in case you don\'t want to use credits: +.sp +.RS 4 +.nf +#%PAM\-1\.0 +# +# These lines require the user to select a password with a minimum +# length of 8 and with at least 1 digit number, 1 upper case letter, +# and 1 other character +# +password required pam_cracklib\.so \e + dcredit=\-1 ucredit=\-1 ocredit=\-1 lcredit=0 minlen=8 +password required pam_unix\.so use_authtok nullok md5 + +.fi +.RE +.sp +.SH "SEE ALSO" +.PP + +\fBpam.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_cracklib was written by Cristian Gafton <gafton@redhat\.com> diff --git a/modules/pam_cracklib/pam_cracklib.8.xml b/modules/pam_cracklib/pam_cracklib.8.xml new file mode 100644 index 00000000..589e7b44 --- /dev/null +++ b/modules/pam_cracklib/pam_cracklib.8.xml @@ -0,0 +1,513 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_cracklib"> + + <refmeta> + <refentrytitle>pam_cracklib</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_cracklib-name"> + <refname>pam_cracklib</refname> + <refpurpose>PAM module to check the password against dictionary words</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_cracklib-cmdsynopsis"> + <command>pam_cracklib.so</command> + <arg choice="opt"> + <replaceable>...</replaceable> + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_cracklib-description"> + + <title>DESCRIPTION</title> + + <para> + This module can be plugged into the <emphasis>password</emphasis> stack of + a given application to provide some plug-in strength-checking for passwords. + </para> + + <para> + The action of this module is to prompt the user for a password and + check its strength against a system dictionary and a set of rules for + identifying poor choices. + </para> + + <para> + The first action is to prompt for a single password, check its + strength and then, if it is considered strong, prompt for the password + a second time (to verify that it was typed correctly on the first + occasion). All being well, the password is passed on to subsequent + modules to be installed as the new authentication token. + </para> + + <para> + The strength checks works in the following manner: at first the + <function>Cracklib</function> routine is called to check if the password + is part of a dictionary; if this is not the case an additional set of + strength checks is done. These checks are: + </para> + + <variablelist> + <varlistentry> + <term>Palindrome</term> + <listitem> + <para> + Is the new password a palindrome of the old one? + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>Case Change Only</term> + <listitem> + <para> + Is the new password the the old one with only a change of case? + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>Similar</term> + <listitem> + <para> + Is the new password too much like the old one? + This is primarily controlled by one argument, + <option>difok</option> which is a number of characters + that if different between the old and new are enough to accept + the new password, this defaults to 10 or 1/2 the size of the + new password whichever is smaller. + </para> + <para> + To avoid the lockup associated with trying to change a long and + complicated password, <option>difignore</option> is available. + This argument can be used to specify the minimum length a new + password needs to be before the <option>difok</option> value is + ignored. The default value for <option>difignore</option> is 23. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>Simple</term> + <listitem> + <para> + Is the new password too small? + This is controlled by 5 arguments <option>minlen</option>, + <option>dcredit</option>, <option>ucredit</option>, + <option>lcredit</option>, and <option>ocredit</option>. See the section + on the arguments for the details of how these work and there defaults. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>Rotated</term> + <listitem> + <para> + Is the new password a rotated version of the old password? + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>Already used</term> + <listitem> + <para> + Was the password used in the past? Previously used passwords + are to be found in <filename>/etc/security/opasswd</filename>. + </para> + </listitem> + </varlistentry> + </variablelist> + <para> + This module with no arguments will work well for standard unix + password encryption. With md5 encryption, passwords can be longer + than 8 characters and the default settings for this module can make it + hard for the user to choose a satisfactory new password. Notably, the + requirement that the new password contain no more than 1/2 of the + characters in the old password becomes a non-trivial constraint. For + example, an old password of the form "the quick brown fox jumped over + the lazy dogs" would be difficult to change... In addition, the + default action is to allow passwords as small as 5 characters in + length. For a md5 systems it can be a good idea to increase the + required minimum size of a password. One can then allow more credit + for different kinds of characters but accept that the new password may + share most of these characters with the old password. + </para> + + </refsect1> + + <refsect1 id="pam_cracklib-options"> + + <title>OPTIONS</title> + <para> + <variablelist> + + <varlistentry> + <term> + <option>debug</option> + </term> + <listitem> + <para> + This option makes the module write information to + <citerefentry> + <refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum> + </citerefentry> + indicating the behavior of the module (this option does + not write password information to the log file). + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>type=<replaceable>XXX</replaceable></option> + </term> + <listitem> + <para> + The default action is for the module to use the + following prompts when requesting passwords: + "New UNIX password: " and "Retype UNIX password: ". + The default word <emphasis>UNIX</emphasis> can + be replaced with this option. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>retry=<replaceable>N</replaceable></option> + </term> + <listitem> + <para> + Prompt user at most <replaceable>N</replaceable> times + before returning with error. The default is + <emphasis>1</emphasis> + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>difok=<replaceable>N</replaceable></option> + </term> + <listitem> + <para> + This argument will change the default of + <emphasis>5</emphasis> for the number of characters in + the new password that must not be present in the old + password. In addition, if 1/2 of the characters in the + new password are different then the new password will + be accepted anyway. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>difignore=<replaceable>N</replaceable></option> + </term> + <listitem> + <para> + How many characters should the password have before + difok will be ignored. The default is + <emphasis>23</emphasis>. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>minlen=<replaceable>N</replaceable></option> + </term> + <listitem> + <para> + The minimum acceptable size for the new password (plus + one if credits are not disabled which is the default). + In addition to the number of characters in the new password, + credit (of +1 in length) is given for each different kind + of character (<emphasis>other</emphasis>, + <emphasis>upper</emphasis>, <emphasis>lower</emphasis> and + <emphasis>digit</emphasis>). The default for this parameter + is <emphasis>9</emphasis> which is good for a old style UNIX + password all of the same type of character but may be too low + to exploit the added security of a md5 system. Note that + there is a pair of length limits in + <emphasis>Cracklib</emphasis> itself, a "way too short" limit + of 4 which is hard coded in and a defined limit (6) that will + be checked without reference to <option>minlen</option>. + If you want to allow passwords as short as 5 characters you + should not use this module. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>dcredit=<replaceable>N</replaceable></option> + </term> + <listitem> + <para> + (N >= 0) This is the maximum credit for having digits in + the new password. If you have less than or + <replaceable>N</replaceable> + digits, each digit will count +1 towards meeting the current + <option>minlen</option> value. The default for + <option>dcredit</option> is 1 which is the recommended + value for <option>minlen</option> less than 10. + </para> + <para> + (N < 0) This is the minimum number of digits that must + be met for a new password. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>ucredit=<replaceable>N</replaceable></option> + </term> + <listitem> + <para> + (N >= 0) This is the maximum credit for having upper + case letters in the new password. If you have less than + or <replaceable>N</replaceable> upper case letters each + letter will count +1 towards meeting the current + <option>minlen</option> value. The default for + <option>ucredit</option> is <emphasis>1</emphasis> which + is the recommended value for <option>minlen</option> less + than 10. + </para> + <para> + (N > 0) This is the minimum number of upper + case letters that must be met for a new password. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>lcredit=<replaceable>N</replaceable></option> + </term> + <listitem> + <para> + (N >= 0) This is the maximum credit for having + lower case letters in the new password. If you have + less than or <replaceable>N</replaceable> lower case + letters, each letter will count +1 towards meeting the + current <option>minlen</option> value. The default for + <option>lcredit</option> is 1 which is the recommended + value for <option>minlen</option> less than 10. + </para> + <para> + (N < 0) This is the minimum number of lower + case letters that must be met for a new password. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>ocredit=<replaceable>N</replaceable></option> + </term> + <listitem> + <para> + (N >= 0) This is the maximum credit for having other + characters in the new password. If you have less than or + <replaceable>N</replaceable> other characters, each + character will count +1 towards meeting the current + <option>minlen</option> value. The default for + <option>ocredit</option> is 1 which is the recommended + value for <option>minlen</option> less than 10. + </para> + <para> + (N < 0) This is the minimum number of other + characters that must be met for a new password. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>minclass=<replaceable>N</replaceable></option> + </term> + <listitem> + <para> + The minimum number of required classes of characters for + the new password. The default number is zero. The four + classes are digits, upper and lower letters and other + characters. + The difference to the <option>credit</option> check is + that a specific class if of characters is not required. + Instead <replaceable>N</replaceable> out of four of the + classes are required. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>use_authtok</option> + </term> + <listitem> + <para> + This argument is used to <emphasis>force</emphasis> the + module to not prompt the user for a new password but use + the one provided by the previously stacked + <emphasis>password</emphasis> module. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>dictpath=<replaceable>/path/to/dict</replaceable></option> + </term> + <listitem> + <para> + Path to the cracklib dictionaries. + </para> + </listitem> + </varlistentry> + + </variablelist> + </para> + </refsect1> + + <refsect1 id="pam_cracklib-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + Only he <option>password</option> service is supported. + </para> + </refsect1> + + <refsect1 id='pam_cracklib-return_values'> + <title>RETURN VALUES</title> + <para> + <variablelist> + + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + The new password passes all checks. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_AUTHTOK_ERR</term> + <listitem> + <para> + No new password was entered, + the username could not be determined or the new + password fails the strength checks. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_AUTHTOK_RECOVERY_ERR</term> + <listitem> + <para> + The old password was not supplied by a previous stacked + module or got not requested from the user. + The first error can happen if <option>use_authtok</option> + is specified. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_SERVICE_ERR</term> + <listitem> + <para> + A internal error occured. + </para> + </listitem> + </varlistentry> + + </variablelist> + </para> + </refsect1> + + <refsect1 id='pam_cracklib-examples'> + <title>EXAMPLES</title> + <para> + For an example of the use of this module, we show how it may be + stacked with the password component of + <citerefentry> + <refentrytitle>pam_unix</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + <programlisting> +# +# These lines stack two password type modules. In this example the +# user is given 3 opportunities to enter a strong password. The +# "use_authtok" argument ensures that the pam_unix module does not +# prompt for a password, but instead uses the one provided by +# pam_cracklib. +# +passwd password required pam_cracklib.so retry=3 +passwd password required pam_unix.so use_authtok + </programlisting> + </para> + + <para> + Another example (in the <filename>/etc/pam.d/passwd</filename> format) + is for the case that you want to use md5 password encryption: + <programlisting> +#%PAM-1.0 +# +# These lines allow a md5 systems to support passwords of at least 14 +# bytes with extra credit of 2 for digits and 2 for others the new +# password must have at least three bytes that are not present in the +# old password +# +password required pam_cracklib.so \ + difok=3 minlen=15 dcredit= 2 ocredit=2 +password required pam_unix.so use_authtok nullok md5 + </programlisting> + </para> + + <para> + And here is another example in case you don't want to use credits: + <programlisting> +#%PAM-1.0 +# +# These lines require the user to select a password with a minimum +# length of 8 and with at least 1 digit number, 1 upper case letter, +# and 1 other character +# +password required pam_cracklib.so \ + dcredit=-1 ucredit=-1 ocredit=-1 lcredit=0 minlen=8 +password required pam_unix.so use_authtok nullok md5 + </programlisting> + </para> + + </refsect1> + + <refsect1 id='pam_cracklib-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_cracklib-author'> + <title>AUTHOR</title> + <para> + pam_cracklib was written by Cristian Gafton <gafton@redhat.com> + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_cracklib/pam_cracklib.c b/modules/pam_cracklib/pam_cracklib.c new file mode 100644 index 00000000..0c39f89d --- /dev/null +++ b/modules/pam_cracklib/pam_cracklib.c @@ -0,0 +1,842 @@ +/* + * pam_cracklib module + */ + +/* + * 0.9. switch to using a distance algorithm in similar() + * 0.86. added support for setting minimum numbers of digits, uppers, + * lowers, and others + * 0.85. added six new options to use this with long passwords. + * 0.8. tidied output and improved D(()) usage for debugging. + * 0.7. added support for more obscure checks for new passwd. + * 0.6. root can reset user passwd to any values (it's only warned) + * 0.5. supports retries - 'retry=N' argument + * 0.4. added argument 'type=XXX' for 'New XXX password' prompt + * 0.3. Added argument 'debug' + * 0.2. new password is feeded to cracklib for verify after typed once + * 0.1. First release + */ + +/* + * Written by Cristian Gafton <gafton@redhat.com> 1996/09/10 + * Long password support by Philip W. Dalrymple <pwd@mdtsoft.com> 1997/07/18 + * See the end of the file for Copyright Information + * + * Modification for long password systems (>8 chars). The original + * module had problems when used in a md5 password system in that it + * allowed too short passwords but required that at least half of the + * bytes in the new password did not appear in the old one. this + * action is still the default and the changes should not break any + * current user. This modification adds 6 new options, one to set the + * number of bytes in the new password that are not in the old one, + * the other five to control the length checking, these are all + * documented (or will be before anyone else sees this code) in the PAM + * S.A.G. in the section on the cracklib module. + */ + +#include "config.h" + +#include <stdio.h> +#ifdef HAVE_CRYPT_H +# include <crypt.h> +#endif +#include <unistd.h> +#include <stdlib.h> +#include <string.h> +#include <syslog.h> +#include <stdarg.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <ctype.h> +#include <limits.h> + +#ifdef HAVE_CRACK_H +#include <crack.h> +#else +extern char *FascistCheck(char *pw, const char *dictpath); +#endif + +#ifndef CRACKLIB_DICTS +#define CRACKLIB_DICTS NULL +#endif + +/* For Translators: "%s%s" could be replaced with "<service> " or "". */ +#define PROMPT1 _("New %s%spassword: ") +/* For Translators: "%s%s" could be replaced with "<service> " or "". */ +#define PROMPT2 _("Retype new %s%spassword: ") +#define MISTYPED_PASS _("Sorry, passwords do not match.") + +#ifdef MIN +#undef MIN +#endif +#define MIN(_a, _b) (((_a) < (_b)) ? (_a) : (_b)) + +/* + * here, we make a definition for the externally accessible function + * in this file (this definition is required for static a module + * but strongly encouraged generally) it is used to instruct the + * modules include file to define the function prototypes. + */ + +#define PAM_SM_PASSWORD + +#include <security/pam_modules.h> +#include <security/_pam_macros.h> +#include <security/pam_ext.h> + +/* argument parsing */ +#define PAM_DEBUG_ARG 0x0001 + +struct cracklib_options { + int retry_times; + int diff_ok; + int diff_ignore; + int min_length; + int dig_credit; + int up_credit; + int low_credit; + int oth_credit; + int min_class; + int use_authtok; + char prompt_type[BUFSIZ]; + const char *cracklib_dictpath; +}; + +#define CO_RETRY_TIMES 1 +#define CO_DIFF_OK 5 +#define CO_DIFF_IGNORE 23 +#define CO_MIN_LENGTH 9 +# define CO_MIN_LENGTH_BASE 5 +#define CO_DIG_CREDIT 1 +#define CO_UP_CREDIT 1 +#define CO_LOW_CREDIT 1 +#define CO_OTH_CREDIT 1 +#define CO_USE_AUTHTOK 0 + +static int +_pam_parse (pam_handle_t *pamh, struct cracklib_options *opt, + int argc, const char **argv) +{ + int ctrl=0; + + /* step through arguments */ + for (ctrl=0; argc-- > 0; ++argv) { + char *ep = NULL; + + /* generic options */ + + if (!strcmp(*argv,"debug")) + ctrl |= PAM_DEBUG_ARG; + else if (!strncmp(*argv,"type=",5)) + strncpy(opt->prompt_type, *argv+5, sizeof(opt->prompt_type) - 1); + else if (!strncmp(*argv,"retry=",6)) { + opt->retry_times = strtol(*argv+6,&ep,10); + if (!ep || (opt->retry_times < 1)) + opt->retry_times = CO_RETRY_TIMES; + } else if (!strncmp(*argv,"difok=",6)) { + opt->diff_ok = strtol(*argv+6,&ep,10); + if (!ep || (opt->diff_ok < 0)) + opt->diff_ok = CO_DIFF_OK; + } else if (!strncmp(*argv,"difignore=",10)) { + opt->diff_ignore = strtol(*argv+10,&ep,10); + if (!ep || (opt->diff_ignore < 0)) + opt->diff_ignore = CO_DIFF_IGNORE; + } else if (!strncmp(*argv,"minlen=",7)) { + opt->min_length = strtol(*argv+7,&ep,10); + if (!ep || (opt->min_length < CO_MIN_LENGTH_BASE)) + opt->min_length = CO_MIN_LENGTH_BASE; + } else if (!strncmp(*argv,"dcredit=",8)) { + opt->dig_credit = strtol(*argv+8,&ep,10); + if (!ep) + opt->dig_credit = 0; + } else if (!strncmp(*argv,"ucredit=",8)) { + opt->up_credit = strtol(*argv+8,&ep,10); + if (!ep) + opt->up_credit = 0; + } else if (!strncmp(*argv,"lcredit=",8)) { + opt->low_credit = strtol(*argv+8,&ep,10); + if (!ep) + opt->low_credit = 0; + } else if (!strncmp(*argv,"ocredit=",8)) { + opt->oth_credit = strtol(*argv+8,&ep,10); + if (!ep) + opt->oth_credit = 0; + } else if (!strncmp(*argv,"minclass=",9)) { + opt->min_class = strtol(*argv+9,&ep,10); + if (!ep) + opt->min_class = 0; + if (opt->min_class > 4) + opt->min_class = 4 ; + } else if (!strncmp(*argv,"use_authtok",11)) { + opt->use_authtok = 1; + } else if (!strncmp(*argv,"dictpath=",9)) { + opt->cracklib_dictpath = *argv+9; + if (!*(opt->cracklib_dictpath)) { + opt->cracklib_dictpath = CRACKLIB_DICTS; + } + } else { + pam_syslog(pamh,LOG_ERR,"pam_parse: unknown option; %s",*argv); + } + } + opt->prompt_type[sizeof(opt->prompt_type) - 1] = '\0'; + + return ctrl; +} + +/* Helper functions */ + +/* use this to free strings. ESPECIALLY password strings */ +static char *_pam_delete(register char *xx) +{ + _pam_overwrite(xx); + free(xx); + return NULL; +} + +/* + * can't be a palindrome - like `R A D A R' or `M A D A M' + */ +static int palindrome(const char *new) +{ + int i, j; + + i = strlen (new); + + for (j = 0;j < i;j++) + if (new[i - j - 1] != new[j]) + return 0; + + return 1; +} + +/* + * Calculate how different two strings are in terms of the number of + * character removals, additions, and changes needed to go from one to + * the other + */ + +static int distdifferent(const char *old, const char *new, + size_t i, size_t j) +{ + char c, d; + + if ((i == 0) || (strlen(old) < i)) { + c = 0; + } else { + c = old[i - 1]; + } + if ((j == 0) || (strlen(new) < j)) { + d = 0; + } else { + d = new[j - 1]; + } + return (c != d); +} + +static int distcalculate(int **distances, const char *old, const char *new, + size_t i, size_t j) +{ + int tmp = 0; + + if (distances[i][j] != -1) { + return distances[i][j]; + } + + tmp = distcalculate(distances, old, new, i - 1, j - 1); + tmp = MIN(tmp, distcalculate(distances, old, new, i, j - 1)); + tmp = MIN(tmp, distcalculate(distances, old, new, i - 1, j)); + tmp += distdifferent(old, new, i, j); + + distances[i][j] = tmp; + + return tmp; +} + +static int distance(const char *old, const char *new) +{ + int **distances = NULL; + size_t m, n, i, j, r; + + m = strlen(old); + n = strlen(new); + distances = malloc(sizeof(int*) * (m + 1)); + + for (i = 0; i <= m; i++) { + distances[i] = malloc(sizeof(int) * (n + 1)); + for(j = 0; j <= n; j++) { + distances[i][j] = -1; + } + } + for (i = 0; i <= m; i++) { + distances[i][0] = i; + } + for (j = 0; j <= n; j++) { + distances[0][j] = j; + } + distances[0][0] = 0; + + r = distcalculate(distances, old, new, m, n); + + for (i = 0; i <= m; i++) { + memset(distances[i], 0, sizeof(int) * (n + 1)); + free(distances[i]); + } + free(distances); + + return r; +} + +static int similar(struct cracklib_options *opt, + const char *old, const char *new) +{ + if (distance(old, new) >= opt->diff_ok) { + return 0; + } + + if (strlen(new) >= (strlen(old) * 2)) { + return 0; + } + + /* passwords are too similar */ + return 1; +} + +/* + * enough classes of charecters + */ + +static int minclass (struct cracklib_options *opt, + const char *new) +{ + int digits = 0; + int uppers = 0; + int lowers = 0; + int others = 0; + int total_class; + int i; + int retval; + + D(( "called" )); + for (i = 0; new[i]; i++) + { + if (isdigit (new[i])) + digits = 1; + else if (isupper (new[i])) + uppers = 1; + else if (islower (new[i])) + lowers = 1; + else + others = 1; + } + + total_class = digits + uppers + lowers + others; + + D (("total class: %d\tmin_class: %d", total_class, opt->min_class)); + + if (total_class >= opt->min_class) + retval = 0; + else + retval = 1; + + return retval; +} + + +/* + * a nice mix of characters. + */ +static int simple(struct cracklib_options *opt, const char *new) +{ + int digits = 0; + int uppers = 0; + int lowers = 0; + int others = 0; + int size; + int i; + + for (i = 0;new[i];i++) { + if (isdigit (new[i])) + digits++; + else if (isupper (new[i])) + uppers++; + else if (islower (new[i])) + lowers++; + else + others++; + } + + /* + * The scam was this - a password of only one character type + * must be 8 letters long. Two types, 7, and so on. + * This is now changed, the base size and the credits or defaults + * see the docs on the module for info on these parameters, the + * defaults cause the effect to be the same as before the change + */ + + if ((opt->dig_credit >= 0) && (digits > opt->dig_credit)) + digits = opt->dig_credit; + + if ((opt->up_credit >= 0) && (uppers > opt->up_credit)) + uppers = opt->up_credit; + + if ((opt->low_credit >= 0) && (lowers > opt->low_credit)) + lowers = opt->low_credit; + + if ((opt->oth_credit >= 0) && (others > opt->oth_credit)) + others = opt->oth_credit; + + size = opt->min_length; + + if (opt->dig_credit >= 0) + size -= digits; + else if (digits < opt->dig_credit * -1) + return 1; + + if (opt->up_credit >= 0) + size -= uppers; + else if (uppers < opt->up_credit * -1) + return 1; + + if (opt->low_credit >= 0) + size -= lowers; + else if (lowers < opt->low_credit * -1) + return 1; + + if (opt->oth_credit >= 0) + size -= others; + else if (others < opt->oth_credit * -1) + return 1; + + if (size <= i) + return 0; + + return 1; +} + +static char * str_lower(char *string) +{ + char *cp; + + for (cp = string; *cp; cp++) + *cp = tolower(*cp); + return string; +} + +static const char *password_check(struct cracklib_options *opt, + const char *old, const char *new) +{ + const char *msg = NULL; + char *oldmono = NULL, *newmono, *wrapped = NULL; + + if (old && strcmp(new, old) == 0) { + msg = _("is the same as the old one"); + return msg; + } + + newmono = str_lower(x_strdup(new)); + if (old) { + oldmono = str_lower(x_strdup(old)); + wrapped = malloc(strlen(oldmono) * 2 + 1); + strcpy (wrapped, oldmono); + strcat (wrapped, oldmono); + } + + if (palindrome(newmono)) + msg = _("is a palindrome"); + + if (!msg && oldmono && strcmp(oldmono, newmono) == 0) + msg = _("case changes only"); + + if (!msg && oldmono && similar(opt, oldmono, newmono)) + msg = _("is too similar to the old one"); + + if (!msg && simple(opt, new)) + msg = _("is too simple"); + + if (!msg && wrapped && strstr(wrapped, newmono)) + msg = _("is rotated"); + + if (!msg && minclass (opt, new)) + msg = _("not enough character classes"); + + memset(newmono, 0, strlen(newmono)); + free(newmono); + if (old) { + memset(oldmono, 0, strlen(oldmono)); + memset(wrapped, 0, strlen(wrapped)); + free(oldmono); + free(wrapped); + } + + return msg; +} + + +#define OLD_PASSWORDS_FILE "/etc/security/opasswd" + +static const char * check_old_password(const char *forwho, const char *newpass) +{ + static char buf[16384]; + char *s_luser, *s_uid, *s_npas, *s_pas; + const char *msg = NULL; + FILE *opwfile; + + opwfile = fopen(OLD_PASSWORDS_FILE, "r"); + if (opwfile == NULL) + return NULL; + + while (fgets(buf, 16380, opwfile)) { + if (!strncmp(buf, forwho, strlen(forwho))) { + char *sptr; + buf[strlen(buf)-1] = '\0'; + s_luser = strtok_r(buf, ":,", &sptr); + s_uid = strtok_r(NULL, ":,", &sptr); + s_npas = strtok_r(NULL, ":,", &sptr); + s_pas = strtok_r(NULL, ":,", &sptr); + while (s_pas != NULL) { + if (!strcmp(crypt(newpass, s_pas), s_pas)) { + msg = _("has been already used"); + break; + } + s_pas = strtok_r(NULL, ":,", &sptr); + } + break; + } + } + fclose(opwfile); + + return msg; +} + + +static int _pam_unix_approve_pass(pam_handle_t *pamh, + unsigned int ctrl, + struct cracklib_options *opt, + const char *pass_old, + const char *pass_new) +{ + const char *msg = NULL; + const void *user; + int retval; + + if (pass_new == NULL || (pass_old && !strcmp(pass_old,pass_new))) { + if (ctrl & PAM_DEBUG_ARG) + pam_syslog(pamh, LOG_DEBUG, "bad authentication token"); + pam_error(pamh, "%s", pass_new == NULL ? + _("No password supplied"):_("Password unchanged")); + return PAM_AUTHTOK_ERR; + } + + /* + * if one wanted to hardwire authentication token strength + * checking this would be the place + */ + msg = password_check(opt, pass_old, pass_new); + if (!msg) { + retval = pam_get_item(pamh, PAM_USER, &user); + if (retval != PAM_SUCCESS || user == NULL) { + if (ctrl & PAM_DEBUG_ARG) + pam_syslog(pamh,LOG_ERR,"Can not get username"); + return PAM_AUTHTOK_ERR; + } + msg = check_old_password(user, pass_new); + } + + if (msg) { + if (ctrl & PAM_DEBUG_ARG) + pam_syslog(pamh, LOG_NOTICE, + "new passwd fails strength check: %s", msg); + pam_error(pamh, _("BAD PASSWORD: %s"), msg); + return PAM_AUTHTOK_ERR; + }; + return PAM_SUCCESS; + +} + +/* The Main Thing (by Cristian Gafton, CEO at this module :-) + * (stolen from http://home.netscape.com) + */ +PAM_EXTERN int pam_sm_chauthtok(pam_handle_t *pamh, int flags, + int argc, const char **argv) +{ + unsigned int ctrl; + struct cracklib_options options; + + D(("called.")); + + memset(&options, 0, sizeof(options)); + options.retry_times = CO_RETRY_TIMES; + options.diff_ok = CO_DIFF_OK; + options.diff_ignore = CO_DIFF_IGNORE; + options.min_length = CO_MIN_LENGTH; + options.dig_credit = CO_DIG_CREDIT; + options.up_credit = CO_UP_CREDIT; + options.low_credit = CO_LOW_CREDIT; + options.oth_credit = CO_OTH_CREDIT; + options.use_authtok = CO_USE_AUTHTOK; + memset(options.prompt_type, 0, BUFSIZ); + strcpy(options.prompt_type,"UNIX"); + options.cracklib_dictpath = CRACKLIB_DICTS; + + ctrl = _pam_parse(pamh, &options, argc, argv); + + if (flags & PAM_PRELIM_CHECK) { + /* Check for passwd dictionary */ + /* We cannot do that, since the original path is compiled + into the cracklib library and we don't know it. */ + return PAM_SUCCESS; + } else if (flags & PAM_UPDATE_AUTHTOK) { + int retval; + char *token1, *token2, *resp; + const void *oldtoken; + + D(("do update")); + retval = pam_get_item(pamh, PAM_OLDAUTHTOK, &oldtoken); + if (retval != PAM_SUCCESS) { + if (ctrl & PAM_DEBUG_ARG) + pam_syslog(pamh,LOG_ERR,"Can not get old passwd"); + oldtoken=NULL; + retval = PAM_SUCCESS; + } + + do { + /* + * make sure nothing inappropriate gets returned + */ + token1 = token2 = NULL; + + if (!options.retry_times) { + D(("returning %s because maxtries reached", + pam_strerror(pamh, retval))); + return retval; + } + + /* Planned modus operandi: + * Get a passwd. + * Verify it against cracklib. + * If okay get it a second time. + * Check to be the same with the first one. + * set PAM_AUTHTOK and return + */ + + if (options.use_authtok == 1) { + const void *item = NULL; + + retval = pam_get_item(pamh, PAM_AUTHTOK, &item); + if (retval != PAM_SUCCESS) { + /* very strange. */ + pam_syslog(pamh, LOG_ALERT, + "pam_get_item returned error to pam_cracklib"); + } else if (item != NULL) { /* we have a password! */ + token1 = x_strdup(item); + item = NULL; + } else { + retval = PAM_AUTHTOK_RECOVERY_ERR; /* didn't work */ + } + + } else { + /* Prepare to ask the user for the first time */ + resp = NULL; + retval = pam_prompt (pamh, PAM_PROMPT_ECHO_OFF, &resp, + PROMPT1, options.prompt_type, + options.prompt_type[0]?" ":""); + + if (retval == PAM_SUCCESS) { /* a good conversation */ + token1 = resp; + if (token1 == NULL) { + pam_syslog(pamh, LOG_NOTICE, + "could not recover authentication token 1"); + retval = PAM_AUTHTOK_RECOVERY_ERR; + } + } else { + retval = (retval == PAM_SUCCESS) ? + PAM_AUTHTOK_RECOVERY_ERR:retval ; + } + } + + if (retval != PAM_SUCCESS) { + if (ctrl & PAM_DEBUG_ARG) + pam_syslog(pamh,LOG_DEBUG,"unable to obtain a password"); + continue; + } + + D(("testing password, retval = %s", pam_strerror(pamh, retval))); + /* now test this passwd against cracklib */ + { + const char *crack_msg; + + D(("against cracklib")); + if ((crack_msg = FascistCheck(token1,options.cracklib_dictpath))) { + if (ctrl & PAM_DEBUG_ARG) + pam_syslog(pamh,LOG_DEBUG,"bad password: %s",crack_msg); + pam_error(pamh, _("BAD PASSWORD: %s"), crack_msg); + if (getuid() || (flags & PAM_CHANGE_EXPIRED_AUTHTOK)) + retval = PAM_AUTHTOK_ERR; + else + retval = PAM_SUCCESS; + } else { + /* check it for strength too... */ + D(("for strength")); + retval = _pam_unix_approve_pass (pamh, ctrl, &options, + oldtoken, token1); + if (retval != PAM_SUCCESS) { + if (getuid() || (flags & PAM_CHANGE_EXPIRED_AUTHTOK)) + retval = PAM_AUTHTOK_ERR; + else + retval = PAM_SUCCESS; + } + } + } + + D(("after testing: retval = %s", pam_strerror(pamh, retval))); + /* if cracklib/strength check said it is a bad passwd... */ + if ((retval != PAM_SUCCESS) && (retval != PAM_IGNORE)) { + int temp_unused; + + temp_unused = pam_set_item(pamh, PAM_AUTHTOK, NULL); + token1 = _pam_delete(token1); + continue; + } + + /* Now we have a good passwd. Ask for it once again */ + + if (options.use_authtok == 0) { + resp = NULL; + retval = pam_prompt (pamh, PAM_PROMPT_ECHO_OFF, &resp, + PROMPT2, options.prompt_type, + options.prompt_type[0]?" ":""); + if (retval == PAM_SUCCESS) { /* a good conversation */ + token2 = resp; + if (token2 == NULL) { + pam_syslog(pamh,LOG_NOTICE, + "could not recover authentication token 2"); + retval = PAM_AUTHTOK_RECOVERY_ERR; + } + } + + /* No else, the a retval == PAM_SUCCESS path can change retval + to a failure code. */ + if (retval != PAM_SUCCESS) { + if (ctrl & PAM_DEBUG_ARG) + pam_syslog(pamh,LOG_DEBUG,"unable to obtain retyped password"); + continue; + } + + /* Hopefully now token1 and token2 the same password ... */ + if (strcmp(token1,token2) != 0) { + /* tell the user */ + pam_error(pamh, "%s", MISTYPED_PASS); + token1 = _pam_delete(token1); + token2 = _pam_delete(token2); + pam_set_item(pamh, PAM_AUTHTOK, NULL); + if (ctrl & PAM_DEBUG_ARG) + pam_syslog(pamh,LOG_NOTICE,"Password mistyped"); + retval = PAM_AUTHTOK_RECOVERY_ERR; + continue; + } + + /* Yes, the password was typed correct twice + * we store this password as an item + */ + + { + const void *item = NULL; + + retval = pam_set_item(pamh, PAM_AUTHTOK, token1); + + /* clean up */ + token1 = _pam_delete(token1); + token2 = _pam_delete(token2); + + if ( (retval != PAM_SUCCESS) || + ((retval = pam_get_item(pamh, PAM_AUTHTOK, &item) + ) != PAM_SUCCESS) ) { + pam_syslog(pamh, LOG_CRIT, "error manipulating password"); + continue; + } + item = NULL; /* break link to password */ + return PAM_SUCCESS; + } + } + + } while (options.retry_times--); + + } else { + if (ctrl & PAM_DEBUG_ARG) + pam_syslog(pamh, LOG_NOTICE, "UNKNOWN flags setting %02X",flags); + return PAM_SERVICE_ERR; + } + + /* Not reached */ + return PAM_SERVICE_ERR; +} + + + +#ifdef PAM_STATIC +/* static module data */ +struct pam_module _pam_cracklib_modstruct = { + "pam_cracklib", + NULL, + NULL, + NULL, + NULL, + NULL, + pam_sm_chauthtok +}; +#endif + +/* + * Copyright (c) Cristian Gafton <gafton@redhat.com>, 1996. + * All rights reserved + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, and the entire permission notice in its entirety, + * including the disclaimer of warranties. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * ALTERNATIVELY, this product may be distributed under the terms of + * the GNU Public License, in which case the provisions of the GPL are + * required INSTEAD OF the above restrictions. (This clause is + * necessary due to a potential bad interaction between the GPL and + * the restrictions contained in a BSD-style copyright.) + * + * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + * + * The following copyright was appended for the long password support + * added with the libpam 0.58 release: + * + * Modificaton Copyright (c) Philip W. Dalrymple III <pwd@mdtsoft.com> + * 1997. All rights reserved + * + * THE MODIFICATION THAT PROVIDES SUPPORT FOR LONG PASSWORD TYPE CHECKING TO + * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + */ diff --git a/modules/pam_cracklib/tst-pam_cracklib b/modules/pam_cracklib/tst-pam_cracklib new file mode 100755 index 00000000..46a7060d --- /dev/null +++ b/modules/pam_cracklib/tst-pam_cracklib @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_cracklib.so diff --git a/modules/pam_debug/Makefile.am b/modules/pam_debug/Makefile.am new file mode 100644 index 00000000..0b798516 --- /dev/null +++ b/modules/pam_debug/Makefile.am @@ -0,0 +1,31 @@ +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@thkukuk.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README $(MANS) $(XMLS) tst-pam_debug + +man_MANS = pam_debug.8 +XMLS = README.xml pam_debug.8.xml + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_debug.la +pam_debug_la_LIBADD = -L$(top_builddir)/libpam -lpam + +TESTS = tst-pam_debug + +if ENABLE_REGENERATE_MAN +noinst_DATA = README +README: pam_debug.8.xml +-include $(top_srcdir)/Make.xml.rules +endif + diff --git a/modules/pam_debug/Makefile.in b/modules/pam_debug/Makefile.in new file mode 100644 index 00000000..6e1b8bb0 --- /dev/null +++ b/modules/pam_debug/Makefile.in @@ -0,0 +1,667 @@ +# Makefile.in generated by automake 1.10.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 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uninstall-securelibLTLIBRARIES + +@ENABLE_REGENERATE_MAN_TRUE@README: pam_debug.8.xml +@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_debug/README b/modules/pam_debug/README new file mode 100644 index 00000000..4afff114 --- /dev/null +++ b/modules/pam_debug/README @@ -0,0 +1,64 @@ +pam_debug — PAM module to debug the PAM stack + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +The pam_debug PAM module is intended as a debugging aide for determining how +the PAM stack is operating. This module returns what its module arguments tell +it to return. + +OPTIONS + +auth=value + + The pam_sm_authenticate(3) function will return value. + +cred=value + + The pam_sm_setcred(3) function will return value. + +acct=value + + The pam_sm_acct_mgmt(3) function will return value. + +prechauthtok=value + + The pam_sm_chauthtok(3) function will return value if the PAM_PRELIM_CHECK + flag is set. + +chauthtok=value + + The pam_sm_chauthtok(3) function will return value if the PAM_PRELIM_CHECK + flag is not set. + +open_session=value + + The pam_sm_open_session(3) function will return value. + +close_session=value + + The pam_sm_close_session(3) function will return value. + +Where value can be one of: success, open_err, symbol_err, service_err, +system_err, buf_err, perm_denied, auth_err, cred_insufficient, +authinfo_unavail, user_unknown, maxtries, new_authtok_reqd, acct_expired, +session_err, cred_unavail, cred_expired, cred_err, no_module_data, conv_err, +authtok_err, authtok_recover_err, authtok_lock_busy, authtok_disable_aging, +try_again, ignore, abort, authtok_expired, module_unknown, bad_item, +conv_again, incomplete. + +EXAMPLES + +auth requisite pam_permit.so +auth [success=2 default=ok] pam_debug.so auth=perm_denied cred=success +auth [default=reset] pam_debug.so auth=success cred=perm_denied +auth [success=done default=die] pam_debug.so +auth optional pam_debug.so auth=perm_denied cred=perm_denied +auth sufficient pam_debug.so auth=success cred=success + + +AUTHOR + +pam_debug was written by Andrew G. Morgan <morgan@kernel.org>. + diff --git a/modules/pam_debug/README.xml b/modules/pam_debug/README.xml new file mode 100644 index 00000000..ef41911b --- /dev/null +++ b/modules/pam_debug/README.xml @@ -0,0 +1,41 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_debug.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_debug.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_debug-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_debug.8.xml" xpointer='xpointer(//refsect1[@id = "pam_debug-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_debug.8.xml" xpointer='xpointer(//refsect1[@id = "pam_debug-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_debug.8.xml" xpointer='xpointer(//refsect1[@id = "pam_debug-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_debug.8.xml" xpointer='xpointer(//refsect1[@id = "pam_debug-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_debug/pam_debug.8 b/modules/pam_debug/pam_debug.8 new file mode 100644 index 00000000..4d0a9091 --- /dev/null +++ b/modules/pam_debug/pam_debug.8 @@ -0,0 +1,126 @@ +.\" Title: pam_debug +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_DEBUG" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_debug - PAM module to debug the PAM stack +.SH "SYNOPSIS" +.HP 13 +\fBpam_debug\.so\fR [auth=\fIvalue\fR] [cred=\fIvalue\fR] [acct=\fIvalue\fR] [prechauthtok=\fIvalue\fR] [chauthtok=\fIvalue\fR] [auth=\fIvalue\fR] [open_session=\fIvalue\fR] [close_session=\fIvalue\fR] +.SH "DESCRIPTION" +.PP +The pam_debug PAM module is intended as a debugging aide for determining how the PAM stack is operating\. This module returns what its module arguments tell it to return\. +.SH "OPTIONS" +.PP +\fBauth=\fR\fB\fIvalue\fR\fR +.RS 4 +The +\fBpam_sm_authenticate\fR(3) +function will return +\fIvalue\fR\. +.RE +.PP +\fBcred=\fR\fB\fIvalue\fR\fR +.RS 4 +The +\fBpam_sm_setcred\fR(3) +function will return +\fIvalue\fR\. +.RE +.PP +\fBacct=\fR\fB\fIvalue\fR\fR +.RS 4 +The +\fBpam_sm_acct_mgmt\fR(3) +function will return +\fIvalue\fR\. +.RE +.PP +\fBprechauthtok=\fR\fB\fIvalue\fR\fR +.RS 4 +The +\fBpam_sm_chauthtok\fR(3) +function will return +\fIvalue\fR +if the +\fIPAM_PRELIM_CHECK\fR +flag is set\. +.RE +.PP +\fBchauthtok=\fR\fB\fIvalue\fR\fR +.RS 4 +The +\fBpam_sm_chauthtok\fR(3) +function will return +\fIvalue\fR +if the +\fIPAM_PRELIM_CHECK\fR +flag is +\fBnot\fR +set\. +.RE +.PP +\fBopen_session=\fR\fB\fIvalue\fR\fR +.RS 4 +The +\fBpam_sm_open_session\fR(3) +function will return +\fIvalue\fR\. +.RE +.PP +\fBclose_session=\fR\fB\fIvalue\fR\fR +.RS 4 +The +\fBpam_sm_close_session\fR(3) +function will return +\fIvalue\fR\. +.RE +.PP +Where +\fIvalue\fR +can be one of: success, open_err, symbol_err, service_err, system_err, buf_err, perm_denied, auth_err, cred_insufficient, authinfo_unavail, user_unknown, maxtries, new_authtok_reqd, acct_expired, session_err, cred_unavail, cred_expired, cred_err, no_module_data, conv_err, authtok_err, authtok_recover_err, authtok_lock_busy, authtok_disable_aging, try_again, ignore, abort, authtok_expired, module_unknown, bad_item, conv_again, incomplete\. +.SH "MODULE SERVICES PROVIDED" +.PP +The services +\fBauth\fR, +\fBaccount\fR, +\fBpassword\fR +and +\fBsession\fR +are supported\. +.SH "RETURN VALUES" +.PP +PAM_SUCCESS +.RS 4 +Default return code if no other value was specified, else specified return value\. +.RE +.SH "EXAMPLES" +.sp +.RS 4 +.nf +auth requisite pam_permit\.so +auth [success=2 default=ok] pam_debug\.so auth=perm_denied cred=success +auth [default=reset] pam_debug\.so auth=success cred=perm_denied +auth [success=done default=die] pam_debug\.so +auth optional pam_debug\.so auth=perm_denied cred=perm_denied +auth sufficient pam_debug\.so auth=success cred=success + +.fi +.RE +.SH "SEE ALSO" +.PP + +\fBpam.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_debug was written by Andrew G\. Morgan <morgan@kernel\.org>\. diff --git a/modules/pam_debug/pam_debug.8.xml b/modules/pam_debug/pam_debug.8.xml new file mode 100644 index 00000000..65519852 --- /dev/null +++ b/modules/pam_debug/pam_debug.8.xml @@ -0,0 +1,231 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_debug"> + + <refmeta> + <refentrytitle>pam_debug</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_debug-name"> + <refname>pam_debug</refname> + <refpurpose>PAM module to debug the PAM stack</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_debug-cmdsynopsis"> + <command>pam_debug.so</command> + <arg choice="opt"> + auth=<replaceable>value</replaceable> + </arg> + <arg choice="opt"> + cred=<replaceable>value</replaceable> + </arg> + <arg choice="opt"> + acct=<replaceable>value</replaceable> + </arg> + <arg choice="opt"> + prechauthtok=<replaceable>value</replaceable> + </arg> + <arg choice="opt"> + chauthtok=<replaceable>value</replaceable> + </arg> + <arg choice="opt"> + auth=<replaceable>value</replaceable> + </arg> + <arg choice="opt"> + open_session=<replaceable>value</replaceable> + </arg> + <arg choice="opt"> + close_session=<replaceable>value</replaceable> + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_debug-description"> + <title>DESCRIPTION</title> + <para> + The pam_debug PAM module is intended as a debugging aide for + determining how the PAM stack is operating. This module returns + what its module arguments tell it to return. + </para> + </refsect1> + + <refsect1 id="pam_debug-options"> + <title>OPTIONS</title> + <variablelist> + <varlistentry> + <term> + <option>auth=<replaceable>value</replaceable></option> + </term> + <listitem> + <para> + The + <citerefentry> + <refentrytitle>pam_sm_authenticate</refentrytitle><manvolnum>3</manvolnum> + </citerefentry> function will return + <replaceable>value</replaceable>. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>cred=<replaceable>value</replaceable></option> + </term> + <listitem> + <para> + The + <citerefentry> + <refentrytitle>pam_sm_setcred</refentrytitle><manvolnum>3</manvolnum> + </citerefentry> function will return + <replaceable>value</replaceable>. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>acct=<replaceable>value</replaceable></option> + </term> + <listitem> + <para> + The + <citerefentry> + <refentrytitle>pam_sm_acct_mgmt</refentrytitle><manvolnum>3</manvolnum> + </citerefentry> function will return + <replaceable>value</replaceable>. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>prechauthtok=<replaceable>value</replaceable></option> + </term> + <listitem> + <para> + The + <citerefentry> + <refentrytitle>pam_sm_chauthtok</refentrytitle><manvolnum>3</manvolnum> + </citerefentry> function will return + <replaceable>value</replaceable> if the + <emphasis>PAM_PRELIM_CHECK</emphasis> flag is set. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>chauthtok=<replaceable>value</replaceable></option> + </term> + <listitem> + <para> + The + <citerefentry> + <refentrytitle>pam_sm_chauthtok</refentrytitle><manvolnum>3</manvolnum> + </citerefentry> function will return + <replaceable>value</replaceable> if the + <emphasis>PAM_PRELIM_CHECK</emphasis> flag is + <emphasis remap='B'>not</emphasis> set. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>open_session=<replaceable>value</replaceable></option> + </term> + <listitem> + <para> + The + <citerefentry> + <refentrytitle>pam_sm_open_session</refentrytitle><manvolnum>3</manvolnum> + </citerefentry> function will return + <replaceable>value</replaceable>. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>close_session=<replaceable>value</replaceable></option> + </term> + <listitem> + <para> + The + <citerefentry> + <refentrytitle>pam_sm_close_session</refentrytitle><manvolnum>3</manvolnum> + </citerefentry> function will return + <replaceable>value</replaceable>. + </para> + </listitem> + </varlistentry> + </variablelist> + <para> + Where <replaceable>value</replaceable> can be one of: success, + open_err, symbol_err, service_err, system_err, buf_err, perm_denied, + auth_err, cred_insufficient, authinfo_unavail, user_unknown, + maxtries, new_authtok_reqd, acct_expired, session_err, cred_unavail, + cred_expired, cred_err, no_module_data, conv_err, authtok_err, + authtok_recover_err, authtok_lock_busy, authtok_disable_aging, + try_again, ignore, abort, authtok_expired, module_unknown, + bad_item, conv_again, incomplete. + </para> + </refsect1> + + <refsect1 id="pam_debug-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + The services <option>auth</option>, <option>account</option>, + <option>password</option> and <option>session</option> are supported. + </para> + </refsect1> + + <refsect1 id='pam_debug-return_values'> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + Default return code if no other value was specified, + else specified return value. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id='pam_debug-examples'> + <title>EXAMPLES</title> + <programlisting> +auth requisite pam_permit.so +auth [success=2 default=ok] pam_debug.so auth=perm_denied cred=success +auth [default=reset] pam_debug.so auth=success cred=perm_denied +auth [success=done default=die] pam_debug.so +auth optional pam_debug.so auth=perm_denied cred=perm_denied +auth sufficient pam_debug.so auth=success cred=success + </programlisting> + </refsect1> + + <refsect1 id='pam_debug-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_debug-author'> + <title>AUTHOR</title> + <para> + pam_debug was written by Andrew G. Morgan <morgan@kernel.org>. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_debug/pam_debug.c b/modules/pam_debug/pam_debug.c new file mode 100644 index 00000000..b0f5bf59 --- /dev/null +++ b/modules/pam_debug/pam_debug.c @@ -0,0 +1,167 @@ +/* pam_permit module */ + +/* + * $Id: pam_debug.c,v 1.5 2006/01/24 09:42:46 kukuk Exp $ + * + * Written by Andrew Morgan <morgan@kernel.org> 2001/02/04 + * + */ + +#define DEFAULT_USER "nobody" + +#include "config.h" + +#include <stdio.h> + +/* + * This module is intended as a debugging aide for determining how + * the PAM stack is operating. + * + * here, we make definitions for the externally accessible functions + * in this file (these definitions are required for static modules + * but strongly encouraged generally) they are used to instruct the + * modules include file to define their prototypes. + */ + +#define PAM_SM_AUTH +#define PAM_SM_ACCOUNT +#define PAM_SM_SESSION +#define PAM_SM_PASSWORD + +#include <security/pam_modules.h> +#include <security/_pam_macros.h> +#include <security/pam_ext.h> + +#define _PAM_ACTION_UNDEF (-10) +#include "../../libpam/pam_tokens.h" + +/* --- authentication management functions --- */ + +static int state(pam_handle_t *pamh, const char *text) +{ + int retval; + + retval = pam_info (pamh, "%s", text); + + if (retval != PAM_SUCCESS) { + D(("pam_info failed")); + } + + return retval; +} + +static int parse_args(int retval, const char *event, + pam_handle_t *pamh, int argc, const char **argv) +{ + int i; + + for (i=0; i<argc; ++i) { + int length = strlen(event); + if (!strncmp(event, argv[i], length) && (argv[i][length] == '=')) { + int j; + const char *return_string = argv[i] + (length+1); + + for (j=0; j<_PAM_RETURN_VALUES; ++j) { + if (!strcmp(return_string, _pam_token_returns[j])) { + retval = j; + state(pamh, argv[i]); + break; + } + } + break; + } + } + + return retval; +} + +PAM_EXTERN +int pam_sm_authenticate(pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + int retval; + const char *user=NULL; + + /* + * authentication requires we know who the user wants to be + */ + retval = pam_get_user(pamh, &user, NULL); + if (retval != PAM_SUCCESS) { + D(("get user returned error: %s", pam_strerror(pamh,retval))); + return retval; + } + if (user == NULL || *user == '\0') { + D(("username not known")); + retval = pam_set_item(pamh, PAM_USER, (const void *) DEFAULT_USER); + if (retval != PAM_SUCCESS) + return retval; + } + user = NULL; /* clean up */ + + retval = parse_args(PAM_SUCCESS, "auth", pamh, argc, argv); + + return retval; +} + +PAM_EXTERN +int pam_sm_setcred(pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + return parse_args(PAM_SUCCESS, "cred", pamh, argc, argv); +} + +/* --- account management functions --- */ + +PAM_EXTERN +int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + return parse_args(PAM_SUCCESS, "acct", pamh, argc, argv); +} + +/* --- password management --- */ + +PAM_EXTERN +int pam_sm_chauthtok(pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + if (flags & PAM_PRELIM_CHECK) { + return parse_args(PAM_SUCCESS, "prechauthtok", pamh, argc, argv); + } else { + return parse_args(PAM_SUCCESS, "chauthtok", pamh, argc, argv); + } +} + +/* --- session management --- */ + +PAM_EXTERN +int pam_sm_open_session(pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + return parse_args(PAM_SUCCESS, "open_session", pamh, argc, argv); +} + +PAM_EXTERN +int pam_sm_close_session(pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + return parse_args(PAM_SUCCESS, "close_session", pamh, argc, argv); +} + +/* end of module definition */ + +#ifdef PAM_STATIC + +/* static module data */ + +struct pam_module _pam_debug_modstruct = { + "pam_debug", + pam_sm_authenticate, + pam_sm_setcred, + pam_sm_acct_mgmt, + pam_sm_open_session, + pam_sm_close_session, + pam_sm_chauthtok +}; + +#endif diff --git a/modules/pam_debug/tst-pam_debug b/modules/pam_debug/tst-pam_debug new file mode 100755 index 00000000..f07ff640 --- /dev/null +++ b/modules/pam_debug/tst-pam_debug @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_debug.so diff --git a/modules/pam_deny/Makefile.am b/modules/pam_deny/Makefile.am new file mode 100644 index 00000000..94b5f0f6 --- /dev/null +++ b/modules/pam_deny/Makefile.am @@ -0,0 +1,34 @@ +# +# Copyright (c) 2005 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README $(MANS) $(XMLS) tst-pam_deny + +man_MANS = pam_deny.8 + +XMLS = README.xml pam_deny.8.xml + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_deny.la +pam_deny_la_LIBADD = -L$(top_builddir)/libpam -lpam + +if ENABLE_REGENERATE_MAN + +noinst_DATA = README + +README: pam_deny.8.xml + +-include $(top_srcdir)/Make.xml.rules +endif + +TESTS = tst-pam_deny diff --git a/modules/pam_deny/Makefile.in b/modules/pam_deny/Makefile.in new file mode 100644 index 00000000..17cecda4 --- /dev/null +++ b/modules/pam_deny/Makefile.in @@ -0,0 +1,669 @@ +# Makefile.in generated by automake 1.10.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY, to the extent permitted by law; without +# even the implied warranty of MERCHANTABILITY or FITNESS FOR A +# PARTICULAR PURPOSE. + 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install-ps install-ps-am \ + install-securelibLTLIBRARIES install-strip installcheck \ + installcheck-am installdirs maintainer-clean \ + maintainer-clean-generic mostlyclean mostlyclean-compile \ + mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \ + tags uninstall uninstall-am uninstall-man uninstall-man8 \ + uninstall-securelibLTLIBRARIES + + +@ENABLE_REGENERATE_MAN_TRUE@README: pam_deny.8.xml + +@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_deny/README b/modules/pam_deny/README new file mode 100644 index 00000000..6b3a86f8 --- /dev/null +++ b/modules/pam_deny/README @@ -0,0 +1,31 @@ +pam_deny — The locking-out PAM module + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +This module can be used to deny access. It always indicates a failure to the +application through the PAM framework. It might be suitable for using for +default (the OTHER) entries. + +EXAMPLES + +#%PAM-1.0 +# +# If we don't have config entries for a service, the +# OTHER entries are used. To be secure, warn and deny +# access to everything. +other auth required pam_warn.so +other auth required pam_deny.so +other account required pam_warn.so +other account required pam_deny.so +other password required pam_warn.so +other password required pam_deny.so +other session required pam_warn.so +other session required pam_deny.so + + +AUTHOR + +pam_deny was written by Andrew G. Morgan <morgan@kernel.org> + diff --git a/modules/pam_deny/README.xml b/modules/pam_deny/README.xml new file mode 100644 index 00000000..ff2e82b0 --- /dev/null +++ b/modules/pam_deny/README.xml @@ -0,0 +1,36 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_deny.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_deny.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_deny-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_deny.8.xml" xpointer='xpointer(//refsect1[@id = "pam_deny-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_deny.8.xml" xpointer='xpointer(//refsect1[@id = "pam_deny-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_deny.8.xml" xpointer='xpointer(//refsect1[@id = "pam_deny-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_deny/pam_deny.8 b/modules/pam_deny/pam_deny.8 new file mode 100644 index 00000000..a9ae410a --- /dev/null +++ b/modules/pam_deny/pam_deny.8 @@ -0,0 +1,82 @@ +.\" Title: pam_deny +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_DENY" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_deny - The locking-out PAM module +.SH "SYNOPSIS" +.HP 12 +\fBpam_deny\.so\fR +.SH "DESCRIPTION" +.PP +This module can be used to deny access\. It always indicates a failure to the application through the PAM framework\. It might be suitable for using for default (the +\fIOTHER\fR) entries\. +.SH "OPTIONS" +.PP +This module does not recognise any options\. +.SH "MODULE SERVICES PROVIDED" +.PP +All services (\fBaccount\fR, +\fBauth\fR, +\fBpassword\fR +and +\fBsession\fR) are supported\. +.SH "RETURN VALUES" +.PP +.PP +PAM_AUTH_ERR +.RS 4 +This is returned by the account and auth services\. +.RE +.PP +PAM_CRED_ERR +.RS 4 +This is returned by the setcred function\. +.RE +.PP +PAM_AUTHTOK_ERR +.RS 4 +This is returned by the password service\. +.RE +.PP +PAM_SESSION_ERR +.RS 4 +This is returned by the session service\. +.RE +.SH "EXAMPLES" +.sp +.RS 4 +.nf +#%PAM\-1\.0 +# +# If we don\'t have config entries for a service, the +# OTHER entries are used\. To be secure, warn and deny +# access to everything\. +other auth required pam_warn\.so +other auth required pam_deny\.so +other account required pam_warn\.so +other account required pam_deny\.so +other password required pam_warn\.so +other password required pam_deny\.so +other session required pam_warn\.so +other session required pam_deny\.so + +.fi +.RE +.SH "SEE ALSO" +.PP + +\fBpam.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_deny was written by Andrew G\. Morgan <morgan@kernel\.org> diff --git a/modules/pam_deny/pam_deny.8.xml b/modules/pam_deny/pam_deny.8.xml new file mode 100644 index 00000000..e50beb2d --- /dev/null +++ b/modules/pam_deny/pam_deny.8.xml @@ -0,0 +1,135 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_deny"> + + <refmeta> + <refentrytitle>pam_deny</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_deny-name"> + <refname>pam_deny</refname> + <refpurpose>The locking-out PAM module</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_deny-cmdsynopsis"> + <command>pam_deny.so</command> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_deny-description"> + + <title>DESCRIPTION</title> + + <para> + This module can be used to deny access. It always indicates a failure + to the application through the PAM framework. It might be suitable + for using for default (the <emphasis>OTHER</emphasis>) entries. + </para> + + </refsect1> + + <refsect1 id="pam_deny-options"> + <title>OPTIONS</title> + <para>This module does not recognise any options.</para> + </refsect1> + + <refsect1 id="pam_deny-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + All services (<option>account</option>, <option>auth</option>, + <option>password</option> and <option>session</option>) are supported. + </para> + </refsect1> + + <refsect1 id='pam_deny-return_values'> + <title>RETURN VALUES</title> + <para> + <variablelist> + + <varlistentry> + <term>PAM_AUTH_ERR</term> + <listitem> + <para> + This is returned by the account and auth services. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_CRED_ERR</term> + <listitem> + <para> + This is returned by the setcred function. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_AUTHTOK_ERR</term> + <listitem> + <para> + This is returned by the password service. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_SESSION_ERR</term> + <listitem> + <para> + This is returned by the session service. + </para> + </listitem> + </varlistentry> + + </variablelist> + </para> + </refsect1> + + <refsect1 id='pam_deny-examples'> + <title>EXAMPLES</title> + <programlisting> +#%PAM-1.0 +# +# If we don't have config entries for a service, the +# OTHER entries are used. To be secure, warn and deny +# access to everything. +other auth required pam_warn.so +other auth required pam_deny.so +other account required pam_warn.so +other account required pam_deny.so +other password required pam_warn.so +other password required pam_deny.so +other session required pam_warn.so +other session required pam_deny.so + </programlisting> + </refsect1> + + <refsect1 id='pam_deny-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_deny-author'> + <title>AUTHOR</title> + <para> + pam_deny was written by Andrew G. Morgan <morgan@kernel.org> + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_deny/pam_deny.c b/modules/pam_deny/pam_deny.c new file mode 100644 index 00000000..83524802 --- /dev/null +++ b/modules/pam_deny/pam_deny.c @@ -0,0 +1,89 @@ +/* pam_deny module */ + +/* + * $Id: pam_deny.c,v 1.4 2005/12/14 09:58:32 kukuk Exp $ + * + * Written by Andrew Morgan <morgan@parc.power.net> 1996/3/11 + * + */ + +/* + * here, we make definitions for the externally accessible functions + * in this file (these definitions are required for static modules + * but strongly encouraged generally) they are used to instruct the + * modules include file to define their prototypes. + */ + +#include "config.h" + +#define PAM_SM_AUTH +#define PAM_SM_ACCOUNT +#define PAM_SM_SESSION +#define PAM_SM_PASSWORD + +#include <security/pam_modules.h> + +/* --- authentication management functions --- */ + +PAM_EXTERN int +pam_sm_authenticate(pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_AUTH_ERR; +} + +PAM_EXTERN int +pam_sm_setcred(pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_CRED_ERR; +} + +/* --- account management functions --- */ + +PAM_EXTERN int +pam_sm_acct_mgmt(pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_AUTH_ERR; +} + +/* --- password management --- */ + +PAM_EXTERN int +pam_sm_chauthtok(pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_AUTHTOK_ERR; +} + +/* --- session management --- */ + +PAM_EXTERN int +pam_sm_open_session(pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_SESSION_ERR; +} + +PAM_EXTERN int +pam_sm_close_session(pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_SESSION_ERR; +} + +/* end of module definition */ + +/* static module data */ +#ifdef PAM_STATIC +struct pam_module _pam_deny_modstruct = { + "pam_deny", + pam_sm_authenticate, + pam_sm_setcred, + pam_sm_acct_mgmt, + pam_sm_open_session, + pam_sm_close_session, + pam_sm_chauthtok +}; +#endif diff --git a/modules/pam_deny/tst-pam_deny b/modules/pam_deny/tst-pam_deny new file mode 100755 index 00000000..7d9d6bad --- /dev/null +++ b/modules/pam_deny/tst-pam_deny @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_deny.so diff --git a/modules/pam_echo/Makefile.am b/modules/pam_echo/Makefile.am new file mode 100644 index 00000000..d004e8f4 --- /dev/null +++ b/modules/pam_echo/Makefile.am @@ -0,0 +1,31 @@ +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@thkukuk.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README $(MANS) $(XMLS) tst-pam_echo + +man_MANS = pam_echo.8 + +XMLS = README.xml pam_echo.8.xml + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_echo.la +pam_echo_la_LIBADD = -L$(top_builddir)/libpam -lpam + +if ENABLE_REGENERATE_MAN +noinst_DATA = README +README: pam_echo.8.xml +-include $(top_srcdir)/Make.xml.rules +endif + +TESTS = tst-pam_echo diff --git a/modules/pam_echo/Makefile.in b/modules/pam_echo/Makefile.in new file mode 100644 index 00000000..9e03f2a5 --- /dev/null +++ b/modules/pam_echo/Makefile.in @@ -0,0 +1,667 @@ +# Makefile.in generated by automake 1.10.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this 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distclean-libtool distclean-tags distdir dvi dvi-am html \ + html-am info info-am install install-am install-data \ + install-data-am install-dvi install-dvi-am install-exec \ + install-exec-am install-html install-html-am install-info \ + install-info-am install-man install-man8 install-pdf \ + install-pdf-am install-ps install-ps-am \ + install-securelibLTLIBRARIES install-strip installcheck \ + installcheck-am installdirs maintainer-clean \ + maintainer-clean-generic mostlyclean mostlyclean-compile \ + mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \ + tags uninstall uninstall-am uninstall-man uninstall-man8 \ + uninstall-securelibLTLIBRARIES + +@ENABLE_REGENERATE_MAN_TRUE@README: pam_echo.8.xml +@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_echo/README b/modules/pam_echo/README new file mode 100644 index 00000000..fca26b77 --- /dev/null +++ b/modules/pam_echo/README @@ -0,0 +1,50 @@ +pam_echo — PAM module for printing text messages + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +The pam_echo PAM module is for printing text messages to inform user about +special things. Sequences starting with the % character are interpreted in the +following way: + +%H + + The name of the remote host (PAM_RHOST). + +%h + + The name of the local host. + +%s + + The service name (PAM_SERVICE). + +%t + + The name of the controlling terminal (PAM_TTY). + +%U + + The remote user name (PAM_RUSER). + +%u + + The local user name (PAM_USER). + +All other sequences beginning with % expands to the characters following the % +character. + +EXAMPLES + +For an example of the use of this module, we show how it may be used to print +informations about good passwords: + +password optional pam_echo.so file=/usr/share/doc/good-password.txt +password required pam_unix.so + + +AUTHOR + +Thorsten Kukuk <kukuk@thkukuk.de> + diff --git a/modules/pam_echo/README.xml b/modules/pam_echo/README.xml new file mode 100644 index 00000000..b1556e38 --- /dev/null +++ b/modules/pam_echo/README.xml @@ -0,0 +1,36 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_echo.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_echo.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_echo-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_echo.8.xml" xpointer='xpointer(//refsect1[@id = "pam_echo-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_echo.8.xml" xpointer='xpointer(//refsect1[@id = "pam_echo-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_echo.8.xml" xpointer='xpointer(//refsect1[@id = "pam_echo-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_echo/pam_echo.8 b/modules/pam_echo/pam_echo.8 new file mode 100644 index 00000000..3e50afb5 --- /dev/null +++ b/modules/pam_echo/pam_echo.8 @@ -0,0 +1,108 @@ +.\" Title: pam_echo +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_ECHO" "8" "04/16/2008" "Linux-PAM Manual" "Linux-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_echo - PAM module for printing text messages +.SH "SYNOPSIS" +.HP 12 +\fBpam_echo\.so\fR [file=\fI/path/message\fR] +.SH "DESCRIPTION" +.PP +The +\fIpam_echo\fR +PAM module is for printing text messages to inform user about special things\. Sequences starting with the +\fI%\fR +character are interpreted in the following way: +.PP +\fI%H\fR +.RS 4 +The name of the remote host (PAM_RHOST)\. +.RE +.PP +\fB%h\fR +.RS 4 +The name of the local host\. +.RE +.PP +\fI%s\fR +.RS 4 +The service name (PAM_SERVICE)\. +.RE +.PP +\fI%t\fR +.RS 4 +The name of the controlling terminal (PAM_TTY)\. +.RE +.PP +\fI%U\fR +.RS 4 +The remote user name (PAM_RUSER)\. +.RE +.PP +\fI%u\fR +.RS 4 +The local user name (PAM_USER)\. +.RE +.PP +All other sequences beginning with +\fI%\fR +expands to the characters following the +\fI%\fR +character\. +.SH "OPTIONS" +.PP +\fBfile=\fR\fB\fI/path/message\fR\fR +.RS 4 +The content of the file +\fI/path/message\fR +will be printed with the PAM conversion function as PAM_TEXT_INFO\. +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +All services are supported\. +.SH "RETURN VALUES" +.PP +PAM_BUF_ERR +.RS 4 +Memory buffer error\. +.RE +.PP +PAM_SUCCESS +.RS 4 +Message was successful printed\. +.RE +.PP +PAM_IGNORE +.RS 4 +PAM_SILENT flag was given or message file does not exist, no message printed\. +.RE +.SH "EXAMPLES" +.PP +For an example of the use of this module, we show how it may be used to print informations about good passwords: +.sp +.RS 4 +.nf +password optional pam_echo\.so file=/usr/share/doc/good\-password\.txt +password required pam_unix\.so + +.fi +.RE +.sp +.SH "SEE ALSO" +.PP + +\fBpam.conf\fR(8), +\fBpam.d\fR(8), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +Thorsten Kukuk <kukuk@thkukuk\.de> diff --git a/modules/pam_echo/pam_echo.8.xml b/modules/pam_echo/pam_echo.8.xml new file mode 100644 index 00000000..4a495195 --- /dev/null +++ b/modules/pam_echo/pam_echo.8.xml @@ -0,0 +1,168 @@ +<?xml version="1.0" encoding="ISO-8859-1"?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN" + "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd"> + +<refentry id='pam_echo'> + <refmeta> + <refentrytitle>pam_echo</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class='setdesc'>Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id='pam_echo-name'> + <refname>pam_echo</refname> + <refpurpose>PAM module for printing text messages</refpurpose> + </refnamediv> + +<!-- body begins here --> + + <refsynopsisdiv> + <cmdsynopsis id="pam_echo-cmdsynopsis"> + <command>pam_echo.so</command> + <arg choice="opt"> + file=<replaceable>/path/message</replaceable> + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id='pam_echo-description'> + <title>DESCRIPTION</title> + <para> + The <emphasis>pam_echo</emphasis> PAM module is for printing + text messages to inform user about special things. Sequences + starting with the <emphasis>%</emphasis> character are + interpreted in the following way: + </para> + <variablelist> + <varlistentry> + <term><emphasis>%H</emphasis></term> + <listitem> + <para>The name of the remote host (PAM_RHOST).</para> + </listitem> + </varlistentry> + <varlistentry> + <term><emphasis remap='B'>%h</emphasis></term> + <listitem> + <para>The name of the local host.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><emphasis>%s</emphasis></term> + <listitem> + <para>The service name (PAM_SERVICE).</para> + </listitem> + </varlistentry> + <varlistentry> + <term><emphasis>%t</emphasis></term> + <listitem> + <para>The name of the controlling terminal (PAM_TTY).</para> + </listitem> + </varlistentry> + <varlistentry> + <term><emphasis>%U</emphasis></term> + <listitem> + <para>The remote user name (PAM_RUSER).</para> + </listitem> + </varlistentry> + <varlistentry> + <term><emphasis>%u</emphasis></term> + <listitem> + <para>The local user name (PAM_USER).</para> + </listitem> + </varlistentry> + </variablelist> + + <para> + All other sequences beginning with <emphasis>%</emphasis> + expands to the characters following the <emphasis>%</emphasis> + character. + </para> + </refsect1> + + <refsect1 id='pam_echo-options'> + <title>OPTIONS</title> + <variablelist> + <varlistentry> + <term> + <option>file=<replaceable>/path/message</replaceable></option> + </term> + <listitem> + <para> + The content of the file <filename>/path/message</filename> + will be printed with the PAM conversion function as PAM_TEXT_INFO. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_echo-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + All services are supported. + </para> + </refsect1> + + + <refsect1 id="pam_echo-return_values"> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_BUF_ERR</term> + <listitem> + <para> + Memory buffer error. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + Message was successful printed. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_IGNORE</term> + <listitem> + <para> + PAM_SILENT flag was given or message file does not + exist, no message printed. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id='pam_echo-examples'> + <title>EXAMPLES</title> + <para> + For an example of the use of this module, we show how it may be + used to print informations about good passwords: + <programlisting> +password optional pam_echo.so file=/usr/share/doc/good-password.txt +password required pam_unix.so + </programlisting> + </para> + </refsect1> + + + <refsect1 id='pam_echo-see_also'><title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry></para> + </refsect1> + + <refsect1 id='pam_echo-author'> + <title>AUTHOR</title> + <para>Thorsten Kukuk <kukuk@thkukuk.de></para> + </refsect1> +</refentry> diff --git a/modules/pam_echo/pam_echo.c b/modules/pam_echo/pam_echo.c new file mode 100644 index 00000000..31ebca22 --- /dev/null +++ b/modules/pam_echo/pam_echo.c @@ -0,0 +1,269 @@ +/* + * Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, and the entire permission notice in its entirety, + * including the disclaimer of warranties. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * ALTERNATIVELY, this product may be distributed under the terms of + * the GNU Public License, in which case the provisions of the GPL are + * required INSTEAD OF the above restrictions. (This clause is + * necessary due to a potential bad interaction between the GPL and + * the restrictions contained in a BSD-style copyright.) + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#if defined(HAVE_CONFIG_H) +#include "config.h" +#endif + +#include <errno.h> +#include <stdio.h> +#include <fcntl.h> +#include <string.h> +#include <stdlib.h> +#include <unistd.h> +#include <limits.h> +#include <syslog.h> +#include <sys/types.h> +#include <sys/stat.h> + +#ifndef HOST_NAME_MAX +#define HOST_NAME_MAX 255 +#endif + +#define PAM_SM_ACCOUNT +#define PAM_SM_AUTH +#define PAM_SM_PASSWORD +#define PAM_SM_SESSION + +#include <security/pam_modules.h> +#include <security/pam_modutil.h> +#include <security/_pam_macros.h> +#include <security/pam_ext.h> + +static int +replace_and_print (pam_handle_t *pamh, const char *mesg) +{ + char *output; + size_t length = strlen (mesg) + PAM_MAX_MSG_SIZE; + char myhostname[HOST_NAME_MAX+1]; + const void *str = NULL; + const char *p, *q; + int item; + size_t len; + + output = malloc (length); + if (output == NULL) + { + pam_syslog (pamh, LOG_ERR, "running out of memory"); + return PAM_BUF_ERR; + } + + for (p = mesg, len = 0; *p != '\0' && len < length - 1; ++p) + { + if (*p != '%' || p[1] == '\0') + { + output[len++] = *p; + continue; + } + switch (*++p) + { + case 'H': + item = PAM_RHOST; + break; + case 'h': + item = -2; /* aka PAM_LOCALHOST */ + break; + case 's': + item = PAM_SERVICE; + break; + case 't': + item = PAM_TTY; + break; + case 'U': + item = PAM_RUSER; + break; + case 'u': + item = PAM_USER; + break; + default: + output[len++] = *p; + continue; + } + if (item == -2) + { + if (gethostname (myhostname, sizeof (myhostname)) == -1) + str = NULL; + else + str = &myhostname; + } + else + pam_get_item (pamh, item, &str); + if (str == NULL) + str = "(null)"; + for (q = str; *q != '\0' && len < length - 1; ++q) + output[len++] = *q; + } + output[len] = '\0'; + + pam_info (pamh, "%s", output); + free (output); + + return PAM_SUCCESS; +} + +static int +pam_echo (pam_handle_t *pamh, int flags, int argc, const char **argv) +{ + int fd; + int orig_argc = argc; + const char **orig_argv = argv; + const char *file = NULL; + int retval; + + if (flags & PAM_SILENT) + return PAM_IGNORE; + + for (; argc-- > 0; ++argv) + { + if (!strncmp (*argv, "file=", 5)) + file = (5 + *argv); + } + + /* No file= option, use argument for output. */ + if (file == NULL || file[0] == '\0') + { + char msg[PAM_MAX_MSG_SIZE]; + const char *p; + int i; + size_t len; + + for (i = 0, len = 0; i < orig_argc && len < sizeof (msg) - 1; ++i) + { + if (i > 0) + msg[len++] = ' '; + for (p = orig_argv[i]; *p != '\0' && len < sizeof(msg) - 1; ++p) + msg[len++] = *p; + } + msg[len] = '\0'; + + retval = replace_and_print (pamh, msg); + } + else if ((fd = open (file, O_RDONLY, 0)) >= 0) + { + char *mtmp = NULL; + struct stat st; + + /* load file into message buffer. */ + if ((fstat (fd, &st) < 0) || !st.st_size) + return PAM_IGNORE; + + mtmp = malloc (st.st_size + 1); + if (!mtmp) + return PAM_BUF_ERR; + + if (pam_modutil_read (fd, mtmp, st.st_size) == -1) + { + pam_syslog (pamh, LOG_ERR, "Error while reading %s: %m", file); + free (mtmp); + return PAM_IGNORE; + } + + if (mtmp[st.st_size - 1] == '\n') + mtmp[st.st_size - 1] = '\0'; + else + mtmp[st.st_size] = '\0'; + + close (fd); + retval = replace_and_print (pamh, mtmp); + free (mtmp); + } + else + { + pam_syslog (pamh, LOG_ERR, "Cannot open %s: %m", file); + retval = PAM_IGNORE; + } + return retval; +} + +int +pam_sm_authenticate (pam_handle_t *pamh, int flags, int argc, + const char **argv) +{ + return pam_echo (pamh, flags, argc, argv); +} + +int +pam_sm_setcred (pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_IGNORE; +} + +int +pam_sm_acct_mgmt (pam_handle_t *pamh, int flags, int argc, + const char **argv) +{ + return pam_echo (pamh, flags, argc, argv); +} + +int +pam_sm_open_session (pam_handle_t *pamh, int flags, int argc, + const char **argv) +{ + return pam_echo (pamh, flags, argc, argv); +} + +int +pam_sm_close_session (pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_IGNORE; +} + +int +pam_sm_chauthtok (pam_handle_t *pamh, int flags, int argc, + const char **argv) +{ + if (flags & PAM_PRELIM_CHECK) + return pam_echo (pamh, flags, argc, argv); + else + return PAM_IGNORE; +} + +#ifdef PAM_STATIC + +/* static module data */ + +struct pam_module _pam_echo_modstruct = { + "pam_echo", + pam_sm_authenticate, + pam_sm_setcred, + pam_sm_acct_mgmt, + pam_sm_open_session, + pam_sm_close_session, + pam_sm_chauthtok, +}; + +#endif diff --git a/modules/pam_echo/tst-pam_echo b/modules/pam_echo/tst-pam_echo new file mode 100755 index 00000000..483a2c23 --- /dev/null +++ b/modules/pam_echo/tst-pam_echo @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_echo.so diff --git a/modules/pam_env/Makefile.am b/modules/pam_env/Makefile.am new file mode 100644 index 00000000..87813688 --- /dev/null +++ b/modules/pam_env/Makefile.am @@ -0,0 +1,35 @@ +# +# Copyright (c) 2005 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README pam_env.conf $(MANS) $(XMLS) tst-pam_env environment + +man_MANS = pam_env.conf.5 pam_env.8 + +XMLS = README.xml pam_env.conf.5.xml pam_env.8.xml + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include \ + -DDEFAULT_CONF_FILE=\"$(SCONFIGDIR)/pam_env.conf\" +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_env.la +pam_env_la_LIBADD = -L$(top_builddir)/libpam -lpam + +secureconf_DATA = pam_env.conf +sysconf_DATA = environment + +if ENABLE_REGENERATE_MAN +noinst_DATA = README +README: pam_env.8.xml pam_env.conf.5.xml +-include $(top_srcdir)/Make.xml.rules +endif + +TESTS = tst-pam_env diff --git a/modules/pam_env/Makefile.in b/modules/pam_env/Makefile.in new file mode 100644 index 00000000..9cec9c26 --- /dev/null +++ b/modules/pam_env/Makefile.in @@ -0,0 +1,759 @@ +# Makefile.in generated by automake 1.10.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY, to the extent permitted by law; without +# even the implied warranty of MERCHANTABILITY or FITNESS FOR A +# PARTICULAR PURPOSE. + +@SET_MAKE@ + +# +# Copyright (c) 2005 Thorsten Kukuk <kukuk@suse.de> +# + + +VPATH = @srcdir@ +pkgdatadir = $(datadir)/@PACKAGE@ +pkglibdir = $(libdir)/@PACKAGE@ +pkgincludedir = $(includedir)/@PACKAGE@ +am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd +install_sh_DATA = $(install_sh) -c -m 644 +install_sh_PROGRAM = $(install_sh) -c +install_sh_SCRIPT = $(install_sh) -c +INSTALL_HEADER = $(INSTALL_DATA) +transform = $(program_transform_name) +NORMAL_INSTALL = : +PRE_INSTALL = : +POST_INSTALL = : +NORMAL_UNINSTALL = : +PRE_UNINSTALL = : +POST_UNINSTALL = : +build_triplet = @build@ +host_triplet = @host@ +@HAVE_VERSIONING_TRUE@am__append_1 = -Wl,--version-script=$(srcdir)/../modules.map +subdir = modules/pam_env +DIST_COMMON = README $(srcdir)/Makefile.am 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uninstall-secureconfDATA uninstall-securelibLTLIBRARIES \ + uninstall-sysconfDATA + +@ENABLE_REGENERATE_MAN_TRUE@README: pam_env.8.xml pam_env.conf.5.xml +@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_env/README b/modules/pam_env/README new file mode 100644 index 00000000..81c63154 --- /dev/null +++ b/modules/pam_env/README @@ -0,0 +1,74 @@ +pam_env — PAM module to set/unset environment variables + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +The pam_env PAM module allows the (un)setting of environment variables. +Supported is the use of previously set environment variables as well as +PAM_ITEMs such as PAM_RHOST. + +By default rules for (un)setting of variables is taken from the config file / +etc/security/pam_env.conf if no other file is specified. + +This module can also parse a file with simple KEY=VAL pairs on seperate lines +(/etc/environment by default). You can change the default file to parse, with +the envfile flag and turn it on or off by setting the readenv flag to 1 or 0 +respectively. + +OPTIONS + +conffile=/path/to/pam_env.conf + + Indicate an alternative pam_env.conf style configuration file to override + the default. This can be useful when different services need different + environments. + +debug + + A lot of debug informations are printed with syslog(3). + +envfile=/path/to/environment + + Indicate an alternative environment file to override the default. This can + be useful when different services need different environments. + +readenv=0|1 + + Turns on or off the reading of the file specified by envfile (0 is off, 1 + is on). By default this option is on. + +EXAMPLES + +These are some example lines which might be specified in /etc/security/ +pam_env.conf. + +Set the REMOTEHOST variable for any hosts that are remote, default to +"localhost" rather than not being set at all + + REMOTEHOST DEFAULT=localhost OVERRIDE=@{PAM_RHOST} + + +Set the DISPLAY variable if it seems reasonable + + DISPLAY DEFAULT=${REMOTEHOST}:0.0 OVERRIDE=${DISPLAY} + + +Now some simple variables + + PAGER DEFAULT=less + MANPAGER DEFAULT=less + LESS DEFAULT="M q e h15 z23 b80" + NNTPSERVER DEFAULT=localhost + PATH DEFAULT=${HOME}/bin:/usr/local/bin:/bin\ + :/usr/bin:/usr/local/bin/X11:/usr/bin/X11 + + +Silly examples of escaped variables, just to show how they work. + + DOLLAR DEFAULT=\$ + DOLLARDOLLAR DEFAULT= OVERRIDE=\$${DOLLAR} + DOLLARPLUS DEFAULT=\${REMOTEHOST}${REMOTEHOST} + ATSIGN DEFAULT="" OVERRIDE=\@ + + diff --git a/modules/pam_env/README.xml b/modules/pam_env/README.xml new file mode 100644 index 00000000..21a9b855 --- /dev/null +++ b/modules/pam_env/README.xml @@ -0,0 +1,39 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_env.8.xml"> +--> +<!-- +<!ENTITY accessconf SYSTEM "pam_env.conf.5.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_env.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_env-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_env.8.xml" xpointer='xpointer(//refsect1[@id = "pam_env-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_env.8.xml" xpointer='xpointer(//refsect1[@id = "pam_env-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_env.conf.5.xml" xpointer='xpointer(//refsect1[@id = "pam_env.conf-examples"]/*)'/> + </section> + +</article> diff --git a/modules/pam_env/environment b/modules/pam_env/environment new file mode 100644 index 00000000..f46b8d94 --- /dev/null +++ b/modules/pam_env/environment @@ -0,0 +1,5 @@ +# +# This file is parsed by pam_env module +# +# Syntax: simple "KEY=VAL" pairs on seperate lines +# diff --git a/modules/pam_env/pam_env.8 b/modules/pam_env/pam_env.8 new file mode 100644 index 00000000..3fce01cf --- /dev/null +++ b/modules/pam_env/pam_env.8 @@ -0,0 +1,109 @@ +.\" Title: pam_env +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_ENV" "8" "04/16/2008" "Linux-PAM Manual" "Linux-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_env - PAM module to set/unset environment variables +.SH "SYNOPSIS" +.HP 11 +\fBpam_env\.so\fR [debug] [conffile=\fIconf\-file\fR] [envfile=\fIenv\-file\fR] [readenv=\fI0|1\fR] +.SH "DESCRIPTION" +.PP +The pam_env PAM module allows the (un)setting of environment variables\. Supported is the use of previously set environment variables as well as +\fIPAM_ITEM\fRs such as +\fIPAM_RHOST\fR\. +.PP +By default rules for (un)setting of variables is taken from the config file +\fI/etc/security/pam_env\.conf\fR +if no other file is specified\. +.PP +This module can also parse a file with simple +\fIKEY=VAL\fR +pairs on seperate lines (\fI/etc/environment\fR +by default)\. You can change the default file to parse, with the +\fIenvfile\fR +flag and turn it on or off by setting the +\fIreadenv\fR +flag to 1 or 0 respectively\. +.SH "OPTIONS" +.PP +\fBconffile=\fR\fB\fI/path/to/pam_env\.conf\fR\fR +.RS 4 +Indicate an alternative +\fIpam_env\.conf\fR +style configuration file to override the default\. This can be useful when different services need different environments\. +.RE +.PP +\fBdebug\fR +.RS 4 +A lot of debug informations are printed with +\fBsyslog\fR(3)\. +.RE +.PP +\fBenvfile=\fR\fB\fI/path/to/environment\fR\fR +.RS 4 +Indicate an alternative +\fIenvironment\fR +file to override the default\. This can be useful when different services need different environments\. +.RE +.PP +\fBreadenv=\fR\fB\fI0|1\fR\fR +.RS 4 +Turns on or off the reading of the file specified by envfile (0 is off, 1 is on)\. By default this option is on\. +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +The +\fBauth\fR +and +\fBsession\fR +services are supported\. +.SH "RETURN VALUES" +.PP +PAM_ABORT +.RS 4 +Not all relevant data or options could be gotten\. +.RE +.PP +PAM_BUF_ERR +.RS 4 +Memory buffer error\. +.RE +.PP +PAM_IGNORE +.RS 4 +No pam_env\.conf and environment file was found\. +.RE +.PP +PAM_SUCCESS +.RS 4 +Environment variables were set\. +.RE +.SH "FILES" +.PP +\fI/etc/security/pam_env\.conf\fR +.RS 4 +Default configuration file +.RE +.PP +\fI/etc/environment\fR +.RS 4 +Default environment file +.RE +.SH "SEE ALSO" +.PP + +\fBpam_env.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8)\. +.SH "AUTHOR" +.PP +pam_env was written by Dave Kinchlea <kinch@kinch\.ark\.com>\. diff --git a/modules/pam_env/pam_env.8.xml b/modules/pam_env/pam_env.8.xml new file mode 100644 index 00000000..731c20b2 --- /dev/null +++ b/modules/pam_env/pam_env.8.xml @@ -0,0 +1,206 @@ +<?xml version="1.0" encoding="ISO-8859-1"?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN" + "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd"> + +<refentry id='pam_env'> + + <refmeta> + <refentrytitle>pam_env</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class='setdesc'>Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id='pam_env-name'> + <refname>pam_env</refname> + <refpurpose> + PAM module to set/unset environment variables + </refpurpose> + </refnamediv> + +<!-- body begins here --> + + <refsynopsisdiv> + <cmdsynopsis id="pam_env-cmdsynopsis"> + <command>pam_env.so</command> + <arg choice="opt"> + debug + </arg> + <arg choice="opt"> + conffile=<replaceable>conf-file</replaceable> + </arg> + <arg choice="opt"> + envfile=<replaceable>env-file</replaceable> + </arg> + <arg choice="opt"> + readenv=<replaceable>0|1</replaceable> + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + + <refsect1 id="pam_env-description"> + <title>DESCRIPTION</title> + <para> + The pam_env PAM module allows the (un)setting of environment + variables. Supported is the use of previously set environment + variables as well as <emphasis>PAM_ITEM</emphasis>s such as + <emphasis>PAM_RHOST</emphasis>. + </para> + <para> + By default rules for (un)setting of variables is taken from the + config file <filename>/etc/security/pam_env.conf</filename> if + no other file is specified. + </para> + <para> + This module can also parse a file with simple + <emphasis>KEY=VAL</emphasis> pairs on seperate lines + (<filename>/etc/environment</filename> by default). You can + change the default file to parse, with the <emphasis>envfile</emphasis> + flag and turn it on or off by setting the <emphasis>readenv</emphasis> + flag to 1 or 0 respectively. + </para> + </refsect1> + + <refsect1 id="pam_env-options"> + <title>OPTIONS</title> + <variablelist> + + <varlistentry> + <term> + <option>conffile=<replaceable>/path/to/pam_env.conf</replaceable></option> + </term> + <listitem> + <para> + Indicate an alternative <filename>pam_env.conf</filename> + style configuration file to override the default. This can + be useful when different services need different environments. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>debug</option> + </term> + <listitem> + <para> + A lot of debug informations are printed with + <citerefentry><refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum></citerefentry>. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>envfile=<replaceable>/path/to/environment</replaceable></option> + </term> + <listitem> + <para> + Indicate an alternative <filename>environment</filename> + file to override the default. This can be useful when different + services need different environments. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>readenv=<replaceable>0|1</replaceable></option> + </term> + <listitem> + <para> + Turns on or off the reading of the file specified by envfile + (0 is off, 1 is on). By default this option is on. + </para> + </listitem> + </varlistentry> + + </variablelist> + </refsect1> + + <refsect1 id="pam_env-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + The <option>auth</option> and <option>session</option> services + are supported. + </para> + </refsect1> + + <refsect1 id="pam_env-return_values"> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_ABORT</term> + <listitem> + <para> + Not all relevant data or options could be gotten. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_BUF_ERR</term> + <listitem> + <para> + Memory buffer error. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_IGNORE</term> + <listitem> + <para> + No pam_env.conf and environment file was found. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + Environment variables were set. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_env-files"> + <title>FILES</title> + <variablelist> + <varlistentry> + <term><filename>/etc/security/pam_env.conf</filename></term> + <listitem> + <para>Default configuration file</para> + </listitem> + </varlistentry> + <varlistentry> + <term><filename>/etc/environment</filename></term> + <listitem> + <para>Default environment file</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_env-see_also"> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>pam_env.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>. + </para> + </refsect1> + + <refsect1 id="pam_env-authors"> + <title>AUTHOR</title> + <para> + pam_env was written by Dave Kinchlea <kinch@kinch.ark.com>. + </para> + </refsect1> +</refentry> diff --git a/modules/pam_env/pam_env.c b/modules/pam_env/pam_env.c new file mode 100644 index 00000000..1a41833c --- /dev/null +++ b/modules/pam_env/pam_env.c @@ -0,0 +1,832 @@ +/* pam_env module */ + +/* + * $Id: pam_env.c,v 1.13 2005/12/12 14:45:00 ldv Exp $ + * + * Written by Dave Kinchlea <kinch@kinch.ark.com> 1997/01/31 + * Inspired by Andrew Morgan <morgan@kernel.org>, who also supplied the + * template for this file (via pam_mail) + */ + +#define DEFAULT_ETC_ENVFILE "/etc/environment" +#define DEFAULT_READ_ENVFILE 1 + +#include "config.h" + +#include <ctype.h> +#include <errno.h> +#include <pwd.h> +#include <stdarg.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <syslog.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <unistd.h> + +/* + * here, we make a definition for the externally accessible function + * in this file (this definition is required for static a module + * but strongly encouraged generally) it is used to instruct the + * modules include file to define the function prototypes. + */ + +#define PAM_SM_AUTH /* This is primarily a AUTH_SETCRED module */ +#define PAM_SM_SESSION /* But I like to be friendly */ +#define PAM_SM_PASSWORD /* "" */ +#define PAM_SM_ACCOUNT /* "" */ + +#include <security/pam_modules.h> +#include <security/_pam_macros.h> +#include <security/pam_ext.h> + +/* This little structure makes it easier to keep variables together */ + +typedef struct var { + char *name; + char *value; + char *defval; + char *override; +} VAR; + +#define BUF_SIZE 1024 +#define MAX_ENV 8192 + +#define GOOD_LINE 0 +#define BAD_LINE 100 /* This must be > the largest PAM_* error code */ + +#define DEFINE_VAR 101 +#define UNDEFINE_VAR 102 +#define ILLEGAL_VAR 103 + +static int _assemble_line(FILE *, char *, int); +static int _parse_line(const pam_handle_t *, char *, VAR *); +static int _check_var(pam_handle_t *, VAR *); /* This is the real meat */ +static void _clean_var(VAR *); +static int _expand_arg(pam_handle_t *, char **); +static const char * _pam_get_item_byname(pam_handle_t *, const char *); +static int _define_var(pam_handle_t *, VAR *); +static int _undefine_var(pam_handle_t *, VAR *); + +/* This is a flag used to designate an empty string */ +static char quote='Z'; + +/* argument parsing */ + +#define PAM_DEBUG_ARG 0x01 +#define PAM_NEW_CONF_FILE 0x02 +#define PAM_ENV_SILENT 0x04 +#define PAM_NEW_ENV_FILE 0x10 + +static int +_pam_parse (const pam_handle_t *pamh, int argc, const char **argv, + const char **conffile, const char **envfile, int *readenv) +{ + int ctrl=0; + + + /* step through arguments */ + for (; argc-- > 0; ++argv) { + + /* generic options */ + + if (!strcmp(*argv,"debug")) + ctrl |= PAM_DEBUG_ARG; + else if (!strncmp(*argv,"conffile=",9)) { + *conffile = 9 + *argv; + if (**conffile != '\0') { + D(("new Configuration File: %s", *conffile)); + ctrl |= PAM_NEW_CONF_FILE; + } else { + pam_syslog(pamh, LOG_ERR, + "conffile= specification missing argument - ignored"); + } + } else if (!strncmp(*argv,"envfile=",8)) { + *envfile = 8 + *argv; + if (**envfile != '\0') { + D(("new Env File: %s", *envfile)); + ctrl |= PAM_NEW_ENV_FILE; + } else { + pam_syslog (pamh, LOG_ERR, + "envfile= specification missing argument - ignored"); + } + } else if (!strncmp(*argv,"readenv=",8)) + *readenv = atoi(8+*argv); + else + pam_syslog(pamh, LOG_ERR, "unknown option: %s", *argv); + } + + return ctrl; +} + +static int +_parse_config_file(pam_handle_t *pamh, int ctrl, const char *conffile) +{ + int retval; + const char *file; + char buffer[BUF_SIZE]; + FILE *conf; + VAR Var, *var=&Var; + + var->name=NULL; var->defval=NULL; var->override=NULL; + D(("Called.")); + + if (ctrl & PAM_NEW_CONF_FILE) { + file = conffile; + } else { + file = DEFAULT_CONF_FILE; + } + + D(("Config file name is: %s", file)); + + /* + * Lets try to open the config file, parse it and process + * any variables found. + */ + + if ((conf = fopen(file,"r")) == NULL) { + pam_syslog(pamh, LOG_ERR, "Unable to open config file: %s: %m", file); + return PAM_IGNORE; + } + + /* _pam_assemble_line will provide a complete line from the config file, + * with all comments removed and any escaped newlines fixed up + */ + + while (( retval = _assemble_line(conf, buffer, BUF_SIZE)) > 0) { + D(("Read line: %s", buffer)); + + if ((retval = _parse_line(pamh, buffer, var)) == GOOD_LINE) { + retval = _check_var(pamh, var); + + if (DEFINE_VAR == retval) { + retval = _define_var(pamh, var); + + } else if (UNDEFINE_VAR == retval) { + retval = _undefine_var(pamh, var); + } + } + if (PAM_SUCCESS != retval && ILLEGAL_VAR != retval + && BAD_LINE != retval && PAM_BAD_ITEM != retval) break; + + _clean_var(var); + + } /* while */ + + (void) fclose(conf); + + /* tidy up */ + _clean_var(var); /* We could have got here prematurely, + * this is safe though */ + D(("Exit.")); + return (retval != 0 ? PAM_ABORT : PAM_SUCCESS); +} + +static int +_parse_env_file(pam_handle_t *pamh, int ctrl, const char *env_file) +{ + int retval=PAM_SUCCESS, i, t; + const char *file; + char buffer[BUF_SIZE], *key, *mark; + FILE *conf; + + if (ctrl & PAM_NEW_ENV_FILE) + file = env_file; + else + file = DEFAULT_ETC_ENVFILE; + + D(("Env file name is: %s", file)); + + if ((conf = fopen(file,"r")) == NULL) { + pam_syslog(pamh, LOG_ERR, "Unable to open env file: %s: %m", file); + return PAM_IGNORE; + } + + while (_assemble_line(conf, buffer, BUF_SIZE) > 0) { + D(("Read line: %s", buffer)); + key = buffer; + + /* skip leading white space */ + key += strspn(key, " \n\t"); + + /* skip blanks lines and comments */ + if (!key || key[0] == '#') + continue; + + /* skip over "export " if present so we can be compat with + bash type declarations */ + if (strncmp(key, "export ", (size_t) 7) == 0) + key += 7; + + /* now find the end of value */ + mark = key; + while(mark[0] != '\n' && mark[0] != '#' && mark[0] != '\0') + mark++; + if (mark[0] != '\0') + mark[0] = '\0'; + + /* + * sanity check, the key must be alpha-numeric + */ + + for ( i = 0 ; key[i] != '=' && key[i] != '\0' ; i++ ) + if (!isalnum(key[i]) && key[i] != '_') { + D(("key is not alpha numeric - '%s', ignoring", key)); + continue; + } + + /* now we try to be smart about quotes around the value, + but not too smart, we can't get all fancy with escaped + values like bash */ + if (key[i] == '=' && (key[++i] == '\"' || key[i] == '\'')) { + for ( t = i+1 ; key[t] != '\0' ; t++) + if (key[t] != '\"' && key[t] != '\'') + key[i++] = key[t]; + else if (key[t+1] != '\0') + key[i++] = key[t]; + key[i] = '\0'; + } + + /* set the env var, if it fails, we break out of the loop */ + retval = pam_putenv(pamh, key); + if (retval != PAM_SUCCESS) { + D(("error setting env \"%s\"", key)); + break; + } + } + + (void) fclose(conf); + + /* tidy up */ + D(("Exit.")); + return retval; +} + +/* + * This is where we read a line of the PAM config file. The line may be + * preceeded by lines of comments and also extended with "\\\n" + */ + +static int _assemble_line(FILE *f, char *buffer, int buf_len) +{ + char *p = buffer; + char *s, *os; + int used = 0; + + /* loop broken with a 'break' when a non-'\\n' ended line is read */ + + D(("called.")); + for (;;) { + if (used >= buf_len) { + /* Overflow */ + D(("_assemble_line: overflow")); + return -1; + } + if (fgets(p, buf_len - used, f) == NULL) { + if (used) { + /* Incomplete read */ + return -1; + } else { + /* EOF */ + return 0; + } + } + + /* skip leading spaces --- line may be blank */ + + s = p + strspn(p, " \n\t"); + if (*s && (*s != '#')) { + os = s; + + /* + * we are only interested in characters before the first '#' + * character + */ + + while (*s && *s != '#') + ++s; + if (*s == '#') { + *s = '\0'; + used += strlen(os); + break; /* the line has been read */ + } + + s = os; + + /* + * Check for backslash by scanning back from the end of + * the entered line, the '\n' has been included since + * normally a line is terminated with this + * character. fgets() should only return one though! + */ + + s += strlen(s); + while (s > os && ((*--s == ' ') || (*s == '\t') + || (*s == '\n'))); + + /* check if it ends with a backslash */ + if (*s == '\\') { + *s = '\0'; /* truncate the line here */ + used += strlen(os); + p = s; /* there is more ... */ + } else { + /* End of the line! */ + used += strlen(os); + break; /* this is the complete line */ + } + + } else { + /* Nothing in this line */ + /* Don't move p */ + } + } + + return used; +} + +static int +_parse_line (const pam_handle_t *pamh, char *buffer, VAR *var) +{ + /* + * parse buffer into var, legal syntax is + * VARIABLE [DEFAULT=[[string]] [OVERRIDE=[value]] + * + * Any other options defined make this a bad line, + * error logged and no var set + */ + + int length, quoteflg=0; + char *ptr, **valptr, *tmpptr; + + D(("Called buffer = <%s>", buffer)); + + length = strcspn(buffer," \t\n"); + + if ((var->name = malloc(length + 1)) == NULL) { + pam_syslog(pamh, LOG_ERR, "Couldn't malloc %d bytes", length+1); + return PAM_BUF_ERR; + } + + /* + * The first thing on the line HAS to be the variable name, + * it may be the only thing though. + */ + strncpy(var->name, buffer, length); + var->name[length] = '\0'; + D(("var->name = <%s>, length = %d", var->name, length)); + + /* + * Now we check for arguments, we only support two kinds and ('cause I am lazy) + * each one can actually be listed any number of times + */ + + ptr = buffer+length; + while ((length = strspn(ptr, " \t")) > 0) { + ptr += length; /* remove leading whitespace */ + D((ptr)); + if (strncmp(ptr,"DEFAULT=",8) == 0) { + ptr+=8; + D(("Default arg found: <%s>", ptr)); + valptr=&(var->defval); + } else if (strncmp(ptr, "OVERRIDE=", 9) == 0) { + ptr+=9; + D(("Override arg found: <%s>", ptr)); + valptr=&(var->override); + } else { + D(("Unrecognized options: <%s> - ignoring line", ptr)); + pam_syslog(pamh, LOG_ERR, "Unrecognized Option: %s - ignoring line", ptr); + return BAD_LINE; + } + + if ('"' != *ptr) { /* Escaped quotes not supported */ + length = strcspn(ptr, " \t\n"); + tmpptr = ptr+length; + } else { + tmpptr = strchr(++ptr, '"'); + if (!tmpptr) { + D(("Unterminated quoted string: %s", ptr-1)); + pam_syslog(pamh, LOG_ERR, "Unterminated quoted string: %s", ptr-1); + return BAD_LINE; + } + length = tmpptr - ptr; + if (*++tmpptr && ' ' != *tmpptr && '\t' != *tmpptr && '\n' != *tmpptr) { + D(("Quotes must cover the entire string: <%s>", ptr)); + pam_syslog(pamh, LOG_ERR, "Quotes must cover the entire string: <%s>", ptr); + return BAD_LINE; + } + quoteflg++; + } + if (length) { + if ((*valptr = malloc(length + 1)) == NULL) { + D(("Couldn't malloc %d bytes", length+1)); + pam_syslog(pamh, LOG_ERR, "Couldn't malloc %d bytes", length+1); + return PAM_BUF_ERR; + } + (void)strncpy(*valptr,ptr,length); + (*valptr)[length]='\0'; + } else if (quoteflg--) { + *valptr = "e; /* a quick hack to handle the empty string */ + } + ptr = tmpptr; /* Start the search where we stopped */ + } /* while */ + + /* + * The line is parsed, all is well. + */ + + D(("Exit.")); + ptr = NULL; tmpptr = NULL; valptr = NULL; + return GOOD_LINE; +} + +static int _check_var(pam_handle_t *pamh, VAR *var) +{ + /* + * Examine the variable and determine what action to take. + * Returns DEFINE_VAR, UNDEFINE_VAR depending on action to take + * or a PAM_* error code if passed back from other routines + * + * if no DEFAULT provided, the empty string is assumed + * if no OVERRIDE provided, the empty string is assumed + * if DEFAULT= and OVERRIDE evaluates to the empty string, + * this variable should be undefined + * if DEFAULT="" and OVERRIDE evaluates to the empty string, + * this variable should be defined with no value + * if OVERRIDE=value and value turns into the empty string, DEFAULT is used + * + * If DEFINE_VAR is to be returned, the correct value to define will + * be pointed to by var->value + */ + + int retval; + + D(("Called.")); + + /* + * First thing to do is to expand any arguments, but only + * if they are not the special quote values (cause expand_arg + * changes memory). + */ + + if (var->defval && ("e != var->defval) && + ((retval = _expand_arg(pamh, &(var->defval))) != PAM_SUCCESS)) { + return retval; + } + if (var->override && ("e != var->override) && + ((retval = _expand_arg(pamh, &(var->override))) != PAM_SUCCESS)) { + return retval; + } + + /* Now its easy */ + + if (var->override && *(var->override) && "e != var->override) { + /* if there is a non-empty string in var->override, we use it */ + D(("OVERRIDE variable <%s> being used: <%s>", var->name, var->override)); + var->value = var->override; + retval = DEFINE_VAR; + } else { + + var->value = var->defval; + if ("e == var->defval) { + /* + * This means that the empty string was given for defval value + * which indicates that a variable should be defined with no value + */ + *var->defval = '\0'; + D(("An empty variable: <%s>", var->name)); + retval = DEFINE_VAR; + } else if (var->defval) { + D(("DEFAULT variable <%s> being used: <%s>", var->name, var->defval)); + retval = DEFINE_VAR; + } else { + D(("UNDEFINE variable <%s>", var->name)); + retval = UNDEFINE_VAR; + } + } + + D(("Exit.")); + return retval; +} + +static int _expand_arg(pam_handle_t *pamh, char **value) +{ + const char *orig=*value, *tmpptr=NULL; + char *ptr; /* + * Sure would be nice to use tmpptr but it needs to be + * a constant so that the compiler will shut up when I + * call pam_getenv and _pam_get_item_byname -- sigh + */ + + /* No unexpanded variable can be bigger than BUF_SIZE */ + char type, tmpval[BUF_SIZE]; + + /* I know this shouldn't be hard-coded but it's so much easier this way */ + char tmp[MAX_ENV]; + + D(("Remember to initialize tmp!")); + memset(tmp, 0, MAX_ENV); + + /* + * (possibly non-existent) environment variables can be used as values + * by prepending a "$" and wrapping in {} (ie: ${HOST}), can escape with "\" + * (possibly non-existent) PAM items can be used as values + * by prepending a "@" and wrapping in {} (ie: @{PAM_RHOST}, can escape + * + */ + D(("Expanding <%s>",orig)); + while (*orig) { /* while there is some input to deal with */ + if ('\\' == *orig) { + ++orig; + if ('$' != *orig && '@' != *orig) { + D(("Unrecognized escaped character: <%c> - ignoring", *orig)); + pam_syslog(pamh, LOG_ERR, + "Unrecognized escaped character: <%c> - ignoring", + *orig); + } else if ((strlen(tmp) + 1) < MAX_ENV) { + tmp[strlen(tmp)] = *orig++; /* Note the increment */ + } else { + /* is it really a good idea to try to log this? */ + D(("Variable buffer overflow: <%s> + <%s>", tmp, tmpptr)); + pam_syslog (pamh, LOG_ERR, "Variable buffer overflow: <%s> + <%s>", + tmp, tmpptr); + } + continue; + } + if ('$' == *orig || '@' == *orig) { + if ('{' != *(orig+1)) { + D(("Expandable variables must be wrapped in {}" + " <%s> - ignoring", orig)); + pam_syslog(pamh, LOG_ERR, "Expandable variables must be wrapped in {}" + " <%s> - ignoring", orig); + if ((strlen(tmp) + 1) < MAX_ENV) { + tmp[strlen(tmp)] = *orig++; /* Note the increment */ + } + continue; + } else { + D(("Expandable argument: <%s>", orig)); + type = *orig; + orig+=2; /* skip the ${ or @{ characters */ + ptr = strchr(orig, '}'); + if (ptr) { + *ptr++ = '\0'; + } else { + D(("Unterminated expandable variable: <%s>", orig-2)); + pam_syslog(pamh, LOG_ERR, + "Unterminated expandable variable: <%s>", orig-2); + return PAM_ABORT; + } + strncpy(tmpval, orig, sizeof(tmpval)); + tmpval[sizeof(tmpval)-1] = '\0'; + orig=ptr; + /* + * so, we know we need to expand tmpval, it is either + * an environment variable or a PAM_ITEM. type will tell us which + */ + switch (type) { + + case '$': + D(("Expanding env var: <%s>",tmpval)); + tmpptr = pam_getenv(pamh, tmpval); + D(("Expanded to <%s>", tmpptr)); + break; + + case '@': + D(("Expanding pam item: <%s>",tmpval)); + tmpptr = _pam_get_item_byname(pamh, tmpval); + D(("Expanded to <%s>", tmpptr)); + break; + + default: + D(("Impossible error, type == <%c>", type)); + pam_syslog(pamh, LOG_CRIT, "Impossible error, type == <%c>", type); + return PAM_ABORT; + } /* switch */ + + if (tmpptr) { + if ((strlen(tmp) + strlen(tmpptr)) < MAX_ENV) { + strcat(tmp, tmpptr); + } else { + /* is it really a good idea to try to log this? */ + D(("Variable buffer overflow: <%s> + <%s>", tmp, tmpptr)); + pam_syslog (pamh, LOG_ERR, + "Variable buffer overflow: <%s> + <%s>", tmp, tmpptr); + } + } + } /* if ('{' != *orig++) */ + } else { /* if ( '$' == *orig || '@' == *orig) */ + if ((strlen(tmp) + 1) < MAX_ENV) { + tmp[strlen(tmp)] = *orig++; /* Note the increment */ + } else { + /* is it really a good idea to try to log this? */ + D(("Variable buffer overflow: <%s> + <%s>", tmp, tmpptr)); + pam_syslog(pamh, LOG_ERR, + "Variable buffer overflow: <%s> + <%s>", tmp, tmpptr); + } + } + } /* for (;*orig;) */ + + if (strlen(tmp) > strlen(*value)) { + free(*value); + if ((*value = malloc(strlen(tmp) +1)) == NULL) { + D(("Couldn't malloc %d bytes for expanded var", strlen(tmp)+1)); + pam_syslog (pamh, LOG_ERR, "Couldn't malloc %lu bytes for expanded var", + (unsigned long)strlen(tmp)+1); + return PAM_BUF_ERR; + } + } + strcpy(*value, tmp); + memset(tmp,'\0',sizeof(tmp)); + D(("Exit.")); + + return PAM_SUCCESS; +} + +static const char * _pam_get_item_byname(pam_handle_t *pamh, const char *name) +{ + /* + * This function just allows me to use names as given in the config + * file and translate them into the appropriate PAM_ITEM macro + */ + + int item; + const void *itemval; + + D(("Called.")); + if (strcmp(name, "PAM_USER") == 0) { + item = PAM_USER; + } else if (strcmp(name, "PAM_USER_PROMPT") == 0) { + item = PAM_USER_PROMPT; + } else if (strcmp(name, "PAM_TTY") == 0) { + item = PAM_TTY; + } else if (strcmp(name, "PAM_RUSER") == 0) { + item = PAM_RUSER; + } else if (strcmp(name, "PAM_RHOST") == 0) { + item = PAM_RHOST; + } else { + D(("Unknown PAM_ITEM: <%s>", name)); + pam_syslog (pamh, LOG_ERR, "Unknown PAM_ITEM: <%s>", name); + return NULL; + } + + if (pam_get_item(pamh, item, &itemval) != PAM_SUCCESS) { + D(("pam_get_item failed")); + return NULL; /* let pam_get_item() log the error */ + } + D(("Exit.")); + return itemval; +} + +static int _define_var(pam_handle_t *pamh, VAR *var) +{ + /* We have a variable to define, this is a simple function */ + + char *envvar; + int retval = PAM_SUCCESS; + + D(("Called.")); + if (asprintf(&envvar, "%s=%s", var->name, var->value) < 0) { + pam_syslog(pamh, LOG_ERR, "out of memory"); + return PAM_BUF_ERR; + } + + retval = pam_putenv(pamh, envvar); + _pam_drop(envvar); + D(("Exit.")); + return retval; +} + +static int _undefine_var(pam_handle_t *pamh, VAR *var) +{ + /* We have a variable to undefine, this is a simple function */ + + D(("Called and exit.")); + return pam_putenv(pamh, var->name); +} + +static void _clean_var(VAR *var) +{ + if (var->name) { + free(var->name); + } + if (var->defval && ("e != var->defval)) { + free(var->defval); + } + if (var->override && ("e != var->override)) { + free(var->override); + } + var->name = NULL; + var->value = NULL; /* never has memory specific to it */ + var->defval = NULL; + var->override = NULL; + return; +} + + + +/* --- authentication management functions (only) --- */ + +PAM_EXTERN int +pam_sm_authenticate (pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_IGNORE; +} + +PAM_EXTERN int +pam_sm_setcred (pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + int retval, ctrl, readenv=DEFAULT_READ_ENVFILE; + const char *conf_file = NULL, *env_file = NULL; + + /* + * this module sets environment variables read in from a file + */ + + D(("Called.")); + ctrl = _pam_parse(pamh, argc, argv, &conf_file, &env_file, &readenv); + + retval = _parse_config_file(pamh, ctrl, conf_file); + + if(readenv && retval == PAM_SUCCESS) { + retval = _parse_env_file(pamh, ctrl, env_file); + if (retval == PAM_IGNORE) + retval = PAM_SUCCESS; + } + + /* indicate success or failure */ + + D(("Exit.")); + return retval; +} + +PAM_EXTERN int +pam_sm_acct_mgmt (pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + pam_syslog (pamh, LOG_NOTICE, "pam_sm_acct_mgmt called inappropriately"); + return PAM_SERVICE_ERR; +} + +PAM_EXTERN int +pam_sm_open_session (pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + int retval, ctrl, readenv=DEFAULT_READ_ENVFILE; + const char *conf_file = NULL, *env_file = NULL; + + /* + * this module sets environment variables read in from a file + */ + + D(("Called.")); + ctrl = _pam_parse(pamh, argc, argv, &conf_file, &env_file, &readenv); + + retval = _parse_config_file(pamh, ctrl, conf_file); + + if(readenv && retval == PAM_SUCCESS) { + retval = _parse_env_file(pamh, ctrl, env_file); + if (retval == PAM_IGNORE) + retval = PAM_SUCCESS; + } + + /* indicate success or failure */ + + D(("Exit.")); + return retval; +} + +PAM_EXTERN int +pam_sm_close_session (pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + D(("Called and Exit")); + return PAM_SUCCESS; +} + +PAM_EXTERN int +pam_sm_chauthtok (pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + pam_syslog (pamh, LOG_NOTICE, "pam_sm_chauthtok called inappropriately"); + return PAM_SERVICE_ERR; +} + +#ifdef PAM_STATIC + +/* static module data */ + +struct pam_module _pam_env_modstruct = { + "pam_env", + pam_sm_authenticate, + pam_sm_setcred, + pam_sm_acct_mgmt, + pam_sm_open_session, + pam_sm_close_session, + pam_sm_chauthtok, +}; + +#endif + +/* end of module definition */ diff --git a/modules/pam_env/pam_env.conf b/modules/pam_env/pam_env.conf new file mode 100644 index 00000000..d0ba35c2 --- /dev/null +++ b/modules/pam_env/pam_env.conf @@ -0,0 +1,73 @@ +# +# This is the configuration file for pam_env, a PAM module to load in +# a configurable list of environment variables for a +# +# The original idea for this came from Andrew G. Morgan ... +#<quote> +# Mmm. Perhaps you might like to write a pam_env module that reads a +# default environment from a file? I can see that as REALLY +# useful... Note it would be an "auth" module that returns PAM_IGNORE +# for the auth part and sets the environment returning PAM_SUCCESS in +# the setcred function... +#</quote> +# +# What I wanted was the REMOTEHOST variable set, purely for selfish +# reasons, and AGM didn't want it added to the SimpleApps login +# program (which is where I added the patch). So, my first concern is +# that variable, from there there are numerous others that might/would +# be useful to be set: NNTPSERVER, LESS, PATH, PAGER, MANPAGER ..... +# +# Of course, these are a different kind of variable than REMOTEHOST in +# that they are things that are likely to be configured by +# administrators rather than set by logging in, how to treat them both +# in the same config file? +# +# Here is my idea: +# +# Each line starts with the variable name, there are then two possible +# options for each variable DEFAULT and OVERRIDE. +# DEFAULT allows and administrator to set the value of the +# variable to some default value, if none is supplied then the empty +# string is assumed. The OVERRIDE option tells pam_env that it should +# enter in its value (overriding the default value) if there is one +# to use. OVERRIDE is not used, "" is assumed and no override will be +# done. +# +# VARIABLE [DEFAULT=[value]] [OVERRIDE=[value]] +# +# (Possibly non-existent) environment variables may be used in values +# using the ${string} syntax and (possibly non-existent) PAM_ITEMs may +# be used in values using the @{string} syntax. Both the $ and @ +# characters can be backslash escaped to be used as literal values +# values can be delimited with "", escaped " not supported. +# Note that many environment variables that you would like to use +# may not be set by the time the module is called. +# For example, HOME is used below several times, but +# many PAM applications don't make it available by the time you need it. +# +# +# First, some special variables +# +# Set the REMOTEHOST variable for any hosts that are remote, default +# to "localhost" rather than not being set at all +#REMOTEHOST DEFAULT=localhost OVERRIDE=@{PAM_RHOST} +# +# Set the DISPLAY variable if it seems reasonable +#DISPLAY DEFAULT=${REMOTEHOST}:0.0 OVERRIDE=${DISPLAY} +# +# +# Now some simple variables +# +#PAGER DEFAULT=less +#MANPAGER DEFAULT=less +#LESS DEFAULT="M q e h15 z23 b80" +#NNTPSERVER DEFAULT=localhost +#PATH DEFAULT=${HOME}/bin:/usr/local/bin:/bin\ +#:/usr/bin:/usr/local/bin/X11:/usr/bin/X11 +# +# silly examples of escaped variables, just to show how they work. +# +#DOLLAR DEFAULT=\$ +#DOLLARDOLLAR DEFAULT= OVERRIDE=\$${DOLLAR} +#DOLLARPLUS DEFAULT=\${REMOTEHOST}${REMOTEHOST} +#ATSIGN DEFAULT="" OVERRIDE=\@ diff --git a/modules/pam_env/pam_env.conf.5 b/modules/pam_env/pam_env.conf.5 new file mode 100644 index 00000000..3870f3ec --- /dev/null +++ b/modules/pam_env/pam_env.conf.5 @@ -0,0 +1,87 @@ +.\" Title: pam_env.conf +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_ENV\.CONF" "5" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_env.conf - the environment variables config file +.SH "DESCRIPTION" +.PP +The +\fI/etc/security/pam_env\.conf\fR +file specifies the environment variables to be set, unset or modified by +\fBpam_env\fR(8)\. When someone logs in, this file is read and the environment variables are set according\. +.PP +Each line starts with the variable name, there are then two possible options for each variable DEFAULT and OVERRIDE\. DEFAULT allows and administrator to set the value of the variable to some default value, if none is supplied then the empty string is assumed\. The OVERRIDE option tells pam_env that it should enter in its value (overriding the default value) if there is one to use\. OVERRIDE is not used, "" is assumed and no override will be done\. +.PP + +\fIVARIABLE\fR +[\fIDEFAULT=[value]\fR] [\fIOVERRIDE=[value]\fR] +.PP +(Possibly non\-existent) environment variables may be used in values using the ${string} syntax and (possibly non\-existent) PAM_ITEMs may be used in values using the @{string} syntax\. Both the $ and @ characters can be backslash escaped to be used as literal values values can be delimited with "", escaped " not supported\. Note that many environment variables that you would like to use may not be set by the time the module is called\. For example, HOME is used below several times, but many PAM applications don\'t make it available by the time you need it\. +.PP +The "\fI#\fR" character at start of line (no space at front) can be used to mark this line as a comment line\. +.SH "EXAMPLES" +.PP +These are some example lines which might be specified in +\fI/etc/security/pam_env\.conf\fR\. +.PP +Set the REMOTEHOST variable for any hosts that are remote, default to "localhost" rather than not being set at all +.sp +.RS 4 +.nf + REMOTEHOST DEFAULT=localhost OVERRIDE=@{PAM_RHOST} + +.fi +.RE +.PP +Set the DISPLAY variable if it seems reasonable +.sp +.RS 4 +.nf + DISPLAY DEFAULT=${REMOTEHOST}:0\.0 OVERRIDE=${DISPLAY} + +.fi +.RE +.PP +Now some simple variables +.sp +.RS 4 +.nf + PAGER DEFAULT=less + MANPAGER DEFAULT=less + LESS DEFAULT="M q e h15 z23 b80" + NNTPSERVER DEFAULT=localhost + PATH DEFAULT=${HOME}/bin:/usr/local/bin:/bin\e + :/usr/bin:/usr/local/bin/X11:/usr/bin/X11 + +.fi +.RE +.PP +Silly examples of escaped variables, just to show how they work\. +.sp +.RS 4 +.nf + DOLLAR DEFAULT=\e$ + DOLLARDOLLAR DEFAULT= OVERRIDE=\e$${DOLLAR} + DOLLARPLUS DEFAULT=\e${REMOTEHOST}${REMOTEHOST} + ATSIGN DEFAULT="" OVERRIDE=\e@ + +.fi +.RE +.SH "SEE ALSO" +.PP + +\fBpam_env\fR(8), +\fBpam.d\fR(5), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_env was written by Dave Kinchlea <kinch@kinch\.ark\.com>\. diff --git a/modules/pam_env/pam_env.conf.5.xml b/modules/pam_env/pam_env.conf.5.xml new file mode 100644 index 00000000..090e0e75 --- /dev/null +++ b/modules/pam_env/pam_env.conf.5.xml @@ -0,0 +1,123 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_env.conf"> + + <refmeta> + <refentrytitle>pam_env.conf</refentrytitle> + <manvolnum>5</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv> + <refname>pam_env.conf</refname> + <refpurpose>the environment variables config file</refpurpose> + </refnamediv> + + + <refsect1 id='pam_env.conf-description'> + <title>DESCRIPTION</title> + + <para> + The <filename>/etc/security/pam_env.conf</filename> file specifies + the environment variables to be set, unset or modified by + <citerefentry><refentrytitle>pam_env</refentrytitle><manvolnum>8</manvolnum></citerefentry>. + When someone logs in, this file is read and the environment + variables are set according. + </para> + <para> + Each line starts with the variable name, there are then two possible + options for each variable DEFAULT and OVERRIDE. DEFAULT allows and + administrator to set the value of the variable to some default + value, if none is supplied then the empty string is assumed. The + OVERRIDE option tells pam_env that it should enter in its value + (overriding the default value) if there is one to use. OVERRIDE is + not used, "" is assumed and no override will be done. + </para> + <para> + <replaceable>VARIABLE</replaceable> + [<replaceable>DEFAULT=[value]</replaceable>] + [<replaceable>OVERRIDE=[value]</replaceable>] + </para> + + <para> + (Possibly non-existent) environment variables may be used in values + using the ${string} syntax and (possibly non-existent) PAM_ITEMs may + be used in values using the @{string} syntax. Both the $ and @ + characters can be backslash escaped to be used as literal values + values can be delimited with "", escaped " not supported. + Note that many environment variables that you would like to use + may not be set by the time the module is called. + For example, HOME is used below several times, but + many PAM applications don't make it available by the time you need it. + </para> + + <para> + The "<emphasis>#</emphasis>" character at start of line (no space + at front) can be used to mark this line as a comment line. + </para> + + </refsect1> + + <refsect1 id="pam_env.conf-examples"> + <title>EXAMPLES</title> + <para> + These are some example lines which might be specified in + <filename>/etc/security/pam_env.conf</filename>. + </para> + + <para> + Set the REMOTEHOST variable for any hosts that are remote, default + to "localhost" rather than not being set at all + </para> + <programlisting> + REMOTEHOST DEFAULT=localhost OVERRIDE=@{PAM_RHOST} + </programlisting> + + <para> + Set the DISPLAY variable if it seems reasonable + </para> + <programlisting> + DISPLAY DEFAULT=${REMOTEHOST}:0.0 OVERRIDE=${DISPLAY} + </programlisting> + + <para> + Now some simple variables + </para> + <programlisting> + PAGER DEFAULT=less + MANPAGER DEFAULT=less + LESS DEFAULT="M q e h15 z23 b80" + NNTPSERVER DEFAULT=localhost + PATH DEFAULT=${HOME}/bin:/usr/local/bin:/bin\ + :/usr/bin:/usr/local/bin/X11:/usr/bin/X11 + </programlisting> + + <para> + Silly examples of escaped variables, just to show how they work. + </para> + <programlisting> + DOLLAR DEFAULT=\$ + DOLLARDOLLAR DEFAULT= OVERRIDE=\$${DOLLAR} + DOLLARPLUS DEFAULT=\${REMOTEHOST}${REMOTEHOST} + ATSIGN DEFAULT="" OVERRIDE=\@ + </programlisting> + </refsect1> + + <refsect1 id="pam_env.conf-see_also"> + <title>SEE ALSO</title> + <para> + <citerefentry><refentrytitle>pam_env</refentrytitle><manvolnum>8</manvolnum></citerefentry>, + <citerefentry><refentrytitle>pam.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum></citerefentry> + </para> + </refsect1> + + <refsect1 id="pam_env.conf-author"> + <title>AUTHOR</title> + <para> + pam_env was written by Dave Kinchlea <kinch@kinch.ark.com>. + </para> + </refsect1> +</refentry> diff --git a/modules/pam_env/tst-pam_env b/modules/pam_env/tst-pam_env new file mode 100755 index 00000000..c40e70a8 --- /dev/null +++ b/modules/pam_env/tst-pam_env @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_env.so diff --git a/modules/pam_exec/Makefile.am b/modules/pam_exec/Makefile.am new file mode 100644 index 00000000..55fe9297 --- /dev/null +++ b/modules/pam_exec/Makefile.am @@ -0,0 +1,34 @@ +# +# Copyright (c) 2006 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README $(MANS) $(XMLS) tst-pam_exec + +man_MANS = pam_exec.8 + +XMLS = README.xml pam_exec.8.xml + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_exec.la +pam_exec_la_LIBADD = -L$(top_builddir)/libpam -lpam + +if ENABLE_REGENERATE_MAN + +noinst_DATA = README + +README: pam_exec.8.xml + +-include $(top_srcdir)/Make.xml.rules +endif + +TESTS = tst-pam_exec diff --git a/modules/pam_exec/Makefile.in b/modules/pam_exec/Makefile.in new file mode 100644 index 00000000..fac7a4e6 --- /dev/null +++ b/modules/pam_exec/Makefile.in @@ -0,0 +1,669 @@ +# Makefile.in generated by automake 1.10.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY, to the extent permitted by law; without +# even the implied warranty of MERCHANTABILITY or FITNESS FOR A +# PARTICULAR PURPOSE. + +@SET_MAKE@ + +# +# Copyright (c) 2006 Thorsten Kukuk <kukuk@suse.de> +# + + +VPATH = @srcdir@ +pkgdatadir = $(datadir)/@PACKAGE@ +pkglibdir = $(libdir)/@PACKAGE@ +pkgincludedir = $(includedir)/@PACKAGE@ +am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd +install_sh_DATA = $(install_sh) -c -m 644 +install_sh_PROGRAM = $(install_sh) -c +install_sh_SCRIPT = $(install_sh) -c +INSTALL_HEADER = $(INSTALL_DATA) +transform = $(program_transform_name) +NORMAL_INSTALL = : +PRE_INSTALL = : +POST_INSTALL = : +NORMAL_UNINSTALL = : +PRE_UNINSTALL = : +POST_UNINSTALL = : +build_triplet = @build@ +host_triplet = @host@ 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diff --git a/modules/pam_exec/README b/modules/pam_exec/README new file mode 100644 index 00000000..f0845205 --- /dev/null +++ b/modules/pam_exec/README @@ -0,0 +1,52 @@ +pam_exec — PAM module which calls an external command + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +pam_exec is a PAM module that can be used to run an external command. + +The child's environment is set to the current PAM environment list, as returned +by pam_getenvlist(3) In addition, the following PAM items are exported as +environment variables: PAM_RHOST, PAM_RUSER, PAM_SERVICE, PAM_TTY, and PAM_USER +. + +OPTIONS + +debug + + Print debug information. + +log=file + + The output of the command is appended to file + +quiet + + Per default pam_exec.so will echo the exit status of the external command + if it fails. Specifying this option will suppress the message. + +seteuid + + Per default pam_exec.so will execute the external command with the real + user ID of the calling process. Specifying this option means the command is + run with the effective user ID. + +EXAMPLES + +Add the following line to /etc/pam.d/passwd to rebuild the NIS database after +each local password change: + + passwd optional pam_exec.so seteuid make -C /var/yp + + +This will execute the command + +make -C /var/yp + +with effective user ID. + +AUTHOR + +pam_exec was written by Thorsten Kukuk <kukuk@thkukuk.de>. + diff --git a/modules/pam_exec/README.xml b/modules/pam_exec/README.xml new file mode 100644 index 00000000..5e76cab3 --- /dev/null +++ b/modules/pam_exec/README.xml @@ -0,0 +1,41 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_exec.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_exec.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_exec-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_exec.8.xml" xpointer='xpointer(//refsect1[@id = "pam_exec-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_exec.8.xml" xpointer='xpointer(//refsect1[@id = "pam_exec-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_exec.8.xml" xpointer='xpointer(//refsect1[@id = "pam_exec-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_exec.8.xml" xpointer='xpointer(//refsect1[@id = "pam_exec-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_exec/pam_exec.8 b/modules/pam_exec/pam_exec.8 new file mode 100644 index 00000000..da7c7830 --- /dev/null +++ b/modules/pam_exec/pam_exec.8 @@ -0,0 +1,116 @@ +.\" Title: pam_exec +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_EXEC" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_exec - PAM module which calls an external command +.SH "SYNOPSIS" +.HP 12 +\fBpam_exec\.so\fR [debug] [seteuid] [quiet] [log=\fIfile\fR] \fIcommand\fR [\fI\.\.\.\fR] +.SH "DESCRIPTION" +.PP +pam_exec is a PAM module that can be used to run an external command\. +.PP +The child\'s environment is set to the current PAM environment list, as returned by +\fBpam_getenvlist\fR(3) +In addition, the following PAM items are exported as environment variables: +\fIPAM_RHOST\fR, +\fIPAM_RUSER\fR, +\fIPAM_SERVICE\fR, +\fIPAM_TTY\fR, and +\fIPAM_USER\fR\. +.SH "OPTIONS" +.PP +.PP +\fBdebug\fR +.RS 4 +Print debug information\. +.RE +.PP +\fBlog=\fR\fB\fIfile\fR\fR +.RS 4 +The output of the command is appended to +\fIfile\fR +.RE +.PP +\fBquiet\fR +.RS 4 +Per default pam_exec\.so will echo the exit status of the external command if it fails\. Specifying this option will suppress the message\. +.RE +.PP +\fBseteuid\fR +.RS 4 +Per default pam_exec\.so will execute the external command with the real user ID of the calling process\. Specifying this option means the command is run with the effective user ID\. +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +The services +\fBauth\fR, +\fBaccount\fR, +\fBpassword\fR +and +\fBsession\fR +are supported\. +.SH "RETURN VALUES" +.PP +.PP +PAM_SUCCESS +.RS 4 +The external command runs successfull\. +.RE +.PP +PAM_SERVICE_ERR +.RS 4 +No argument or a wrong number of arguments were given\. +.RE +.PP +PAM_SYSTEM_ERR +.RS 4 +A system error occured or the command to execute failed\. +.RE +.PP +PAM_IGNORE +.RS 4 + +\fBpam_setcred\fR +was called, which does not execute the command\. +.RE +.SH "EXAMPLES" +.PP +Add the following line to +\fI/etc/pam\.d/passwd\fR +to rebuild the NIS database after each local password change: +.sp +.RS 4 +.nf + passwd optional pam_exec\.so seteuid make \-C /var/yp + +.fi +.RE +.sp +This will execute the command +.sp +.RS 4 +.nf +make \-C /var/yp +.fi +.RE +.sp +with effective user ID\. +.SH "SEE ALSO" +.PP + +\fBpam.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_exec was written by Thorsten Kukuk <kukuk@thkukuk\.de>\. diff --git a/modules/pam_exec/pam_exec.8.xml b/modules/pam_exec/pam_exec.8.xml new file mode 100644 index 00000000..f4dc1e15 --- /dev/null +++ b/modules/pam_exec/pam_exec.8.xml @@ -0,0 +1,217 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_exec"> + + <refmeta> + <refentrytitle>pam_exec</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_exec-name"> + <refname>pam_exec</refname> + <refpurpose>PAM module which calls an external command</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_exec-cmdsynopsis"> + <command>pam_exec.so</command> + <arg choice="opt"> + debug + </arg> + <arg choice="opt"> + seteuid + </arg> + <arg choice="opt"> + quiet + </arg> + <arg choice="opt"> + log=<replaceable>file</replaceable> + </arg> + <arg choice="plain"> + <replaceable>command</replaceable> + </arg> + <arg choice="opt"> + <replaceable>...</replaceable> + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_exec-description"> + + <title>DESCRIPTION</title> + + <para> + pam_exec is a PAM module that can be used to run + an external command. + </para> + + <para> + The child's environment is set to the current PAM environment list, as + returned by + <citerefentry> + <refentrytitle>pam_getenvlist</refentrytitle><manvolnum>3</manvolnum> + </citerefentry> + In addition, the following PAM items are + exported as environment variables: <emphasis>PAM_RHOST</emphasis>, + <emphasis>PAM_RUSER</emphasis>, <emphasis>PAM_SERVICE</emphasis>, + <emphasis>PAM_TTY</emphasis>, and <emphasis>PAM_USER</emphasis>. + </para> + + </refsect1> + + <refsect1 id="pam_exec-options"> + + <title>OPTIONS</title> + <para> + <variablelist> + + <varlistentry> + <term> + <option>debug</option> + </term> + <listitem> + <para> + Print debug information. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>log=<replaceable>file</replaceable></option> + </term> + <listitem> + <para> + The output of the command is appended to + <filename>file</filename> + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>quiet</option> + </term> + <listitem> + <para> + Per default pam_exec.so will echo the exit status of the + external command if it fails. + Specifying this option will suppress the message. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>seteuid</option> + </term> + <listitem> + <para> + Per default pam_exec.so will execute the external command + with the real user ID of the calling process. + Specifying this option means the command is run + with the effective user ID. + </para> + </listitem> + </varlistentry> + + </variablelist> + + </para> + </refsect1> + + <refsect1 id="pam_exec-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + The services <option>auth</option>, <option>account</option>, + <option>password</option> and <option>session</option> are supported. + </para> + </refsect1> + + <refsect1 id='pam_exec-return_values'> + <title>RETURN VALUES</title> + <para> + <variablelist> + + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + The external command runs successfull. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_SERVICE_ERR</term> + <listitem> + <para> + No argument or a wrong number of arguments were given. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_SYSTEM_ERR</term> + <listitem> + <para> + A system error occured or the command to execute failed. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_IGNORE</term> + <listitem> + <para> + <function>pam_setcred</function> was called, which + does not execute the command. + </para> + </listitem> + </varlistentry> + + </variablelist> + </para> + </refsect1> + + <refsect1 id='pam_exec-examples'> + <title>EXAMPLES</title> + <para> + Add the following line to <filename>/etc/pam.d/passwd</filename> to + rebuild the NIS database after each local password change: + <programlisting> + passwd optional pam_exec.so seteuid make -C /var/yp + </programlisting> + + This will execute the command + <programlisting>make -C /var/yp</programlisting> + with effective user ID. + </para> + </refsect1> + + <refsect1 id='pam_exec-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_exec-author'> + <title>AUTHOR</title> + <para> + pam_exec was written by Thorsten Kukuk <kukuk@thkukuk.de>. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_exec/pam_exec.c b/modules/pam_exec/pam_exec.c new file mode 100644 index 00000000..14dddd54 --- /dev/null +++ b/modules/pam_exec/pam_exec.c @@ -0,0 +1,341 @@ +/* + * Copyright (c) 2006 Thorsten Kukuk <kukuk@thkukuk.de> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, and the entire permission notice in its entirety, + * including the disclaimer of warranties. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * ALTERNATIVELY, this product may be distributed under the terms of + * the GNU Public License, in which case the provisions of the GPL are + * required INSTEAD OF the above restrictions. (This clause is + * necessary due to a potential bad interaction between the GPL and + * the restrictions contained in a BSD-style copyright.) + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#if defined(HAVE_CONFIG_H) +#include "config.h" +#endif + +#include <time.h> +#include <errno.h> +#include <fcntl.h> +#include <stdio.h> +#include <string.h> +#include <syslog.h> +#include <unistd.h> +#include <stdlib.h> +#include <sys/wait.h> +#include <sys/stat.h> +#include <sys/types.h> + + +#define PAM_SM_AUTH +#define PAM_SM_ACCOUNT +#define PAM_SM_SESSION +#define PAM_SM_PASSWORD + +#include <security/pam_modules.h> +#include <security/pam_modutil.h> +#include <security/pam_ext.h> + +#define ENV_ITEM(n) { (n), #n } +static struct { + int item; + const char *name; +} env_items[] = { + ENV_ITEM(PAM_SERVICE), + ENV_ITEM(PAM_USER), + ENV_ITEM(PAM_TTY), + ENV_ITEM(PAM_RHOST), + ENV_ITEM(PAM_RUSER), +}; + +static int +call_exec (pam_handle_t *pamh, int argc, const char **argv) +{ + int debug = 0; + int call_setuid = 0; + int quiet = 0; + int optargc; + const char *logfile = NULL; + pid_t pid; + + if (argc < 1) { + pam_syslog (pamh, LOG_ERR, + "This module needs at least one argument"); + return PAM_SERVICE_ERR; + } + + for (optargc = 0; optargc < argc; optargc++) + { + if (argv[optargc][0] == '/') /* paths starts with / */ + break; + + if (strcasecmp (argv[optargc], "debug") == 0) + debug = 1; + else if (strncasecmp (argv[optargc], "log=", 4) == 0) + logfile = &argv[optargc][4]; + else if (strcasecmp (argv[optargc], "seteuid") == 0) + call_setuid = 1; + else if (strcasecmp (argv[optargc], "quiet") == 0) + quiet = 1; + else + break; /* Unknown option, assume program to execute. */ + } + + + if (optargc >= argc) { + pam_syslog (pamh, LOG_ERR, "No path given as argument"); + return PAM_SERVICE_ERR; + } + + pid = fork(); + if (pid == -1) + return PAM_SYSTEM_ERR; + if (pid > 0) /* parent */ + { + int status = 0; + pid_t retval; + while ((retval = waitpid (pid, &status, 0)) == -1 && + errno == EINTR); + if (retval == (pid_t)-1) + { + pam_syslog (pamh, LOG_ERR, "waitpid returns with -1: %m"); + return PAM_SYSTEM_ERR; + } + else if (status != 0) + { + if (WIFEXITED(status)) + { + pam_syslog (pamh, LOG_ERR, "%s failed: exit code %d", + argv[optargc], WEXITSTATUS(status)); + if (!quiet) + pam_error (pamh, _("%s failed: exit code %d"), + argv[optargc], WEXITSTATUS(status)); + } + else if (WIFSIGNALED(status)) + { + pam_syslog (pamh, LOG_ERR, "%s failed: caught signal %d%s", + argv[optargc], WTERMSIG(status), + WCOREDUMP(status) ? " (core dumped)" : ""); + if (!quiet) + pam_error (pamh, _("%s failed: caught signal %d%s"), + argv[optargc], WTERMSIG(status), + WCOREDUMP(status) ? " (core dumped)" : ""); + } + else + { + pam_syslog (pamh, LOG_ERR, "%s failed: unknown status 0x%x", + argv[optargc], status); + if (!quiet) + pam_error (pamh, _("%s failed: unknown status 0x%x"), + argv[optargc], status); + } + return PAM_SYSTEM_ERR; + } + return PAM_SUCCESS; + } + else /* child */ + { + char **arggv; + int i; + + for (i = 0; i < sysconf (_SC_OPEN_MAX); i++) + close (i); + + /* New stdin. */ + if ((i = open ("/dev/null", O_RDWR)) < 0) + { + int err = errno; + pam_syslog (pamh, LOG_ERR, "open of /dev/null failed: %m"); + exit (err); + } + /* New stdout and stderr. */ + if (logfile) + { + time_t tm = time (NULL); + char *buffer = NULL; + + if ((i = open (logfile, O_CREAT|O_APPEND|O_WRONLY, + S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH)) == -1) + { + int err = errno; + pam_syslog (pamh, LOG_ERR, "open of %s failed: %m", + logfile); + exit (err); + } + if (asprintf (&buffer, "*** %s", ctime (&tm)) > 0) + { + pam_modutil_write (i, buffer, strlen (buffer)); + free (buffer); + } + } + else + if (dup (i) == -1) + { + int err = errno; + pam_syslog (pamh, LOG_ERR, "dup failed: %m"); + exit (err); + } + if (dup (i) == -1) + { + int err = errno; + pam_syslog (pamh, LOG_ERR, "dup failed: %m"); + exit (err); + } + + if (call_setuid) + if (setuid (geteuid ()) == -1) + { + int err = errno; + pam_syslog (pamh, LOG_ERR, "setuid(%lu) failed: %m", + (unsigned long) geteuid ()); + exit (err); + } + + if (setsid () == -1) + { + int err = errno; + pam_syslog (pamh, LOG_ERR, "setsid failed: %m"); + exit (err); + } + + arggv = calloc (argc + 4, sizeof (char *)); + if (arggv == NULL) + exit (ENOMEM); + + for (i = 0; i < (argc - optargc); i++) + arggv[i] = strdup(argv[i+optargc]); + arggv[i] = NULL; + + char **envlist, **tmp; + int envlen, nitems; + + /* + * Set up the child's environment list. It consists of the PAM + * environment, plus a few hand-picked PAM items. + */ + envlist = pam_getenvlist(pamh); + for (envlen = 0; envlist[envlen] != NULL; ++envlen) + /* nothing */ ; + nitems = sizeof(env_items) / sizeof(*env_items); + tmp = realloc(envlist, (envlen + nitems + 1) * sizeof(*envlist)); + if (tmp == NULL) + { + free(envlist); + pam_syslog (pamh, LOG_ERR, "realloc environment failed: %m"); + exit (ENOMEM); + } + envlist = tmp; + for (i = 0; i < nitems; ++i) + { + const void *item; + char *envstr; + + if (pam_get_item(pamh, env_items[i].item, &item) != PAM_SUCCESS || item == NULL) + continue; + if (asprintf(&envstr, "%s=%s", env_items[i].name, (const char *)item) < 0) + { + free(envlist); + pam_syslog (pamh, LOG_ERR, "prepare environment failed: %m"); + exit (ENOMEM); + } + envlist[envlen++] = envstr; + envlist[envlen] = NULL; + } + + if (debug) + pam_syslog (pamh, LOG_DEBUG, "Calling %s ...", arggv[0]); + + if (execve (arggv[0], arggv, envlist) == -1) + { + int err = errno; + pam_syslog (pamh, LOG_ERR, "execve(%s,...) failed: %m", + arggv[0]); + free(envlist); + exit (err); + } + free(envlist); + exit (1); /* should never be reached. */ + } + return PAM_SYSTEM_ERR; /* will never be reached. */ +} + +PAM_EXTERN int +pam_sm_authenticate (pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + return call_exec (pamh, argc, argv); +} + +PAM_EXTERN int +pam_sm_setcred (pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_IGNORE; +} + +/* password updating functions */ + +PAM_EXTERN int +pam_sm_chauthtok(pam_handle_t *pamh, int flags, + int argc, const char **argv) +{ + if (flags & PAM_PRELIM_CHECK) + return PAM_SUCCESS; + return call_exec (pamh, argc, argv); +} + +PAM_EXTERN int +pam_sm_acct_mgmt(pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + return call_exec (pamh, argc, argv); +} + +PAM_EXTERN int +pam_sm_open_session(pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + return call_exec (pamh, argc, argv); +} + +PAM_EXTERN int +pam_sm_close_session(pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + return call_exec (pamh, argc, argv); +} + +#ifdef PAM_STATIC +struct pam_module _pam_exec_modstruct = { + "pam_exec", + pam_sm_authenticate, + pam_sm_setcred, + pam_sm_acct_mgmt, + pam_sm_open_session, + pam_sm_close_session, + pam_sm_chauthtok, +}; +#endif diff --git a/modules/pam_exec/tst-pam_exec b/modules/pam_exec/tst-pam_exec new file mode 100755 index 00000000..a0b00393 --- /dev/null +++ b/modules/pam_exec/tst-pam_exec @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_exec.so diff --git a/modules/pam_faildelay/Makefile.am b/modules/pam_faildelay/Makefile.am new file mode 100644 index 00000000..2796018c --- /dev/null +++ b/modules/pam_faildelay/Makefile.am @@ -0,0 +1,31 @@ +# +# Copyright (c) 2006 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README $(MANS) $(XMLS) tst-pam_faildelay + +man_MANS = pam_faildelay.8 +XMLS = README.xml pam_faildelay.8.xml + +TESTS = tst-pam_faildelay + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_faildelay.la +pam_faildelay_la_LIBADD = -L$(top_builddir)/libpam -lpam + +if ENABLE_REGENERATE_MAN +noinst_DATA = README +README: pam_faildelay.8.xml +-include $(top_srcdir)/Make.xml.rules +endif + diff --git a/modules/pam_faildelay/Makefile.in b/modules/pam_faildelay/Makefile.in new file mode 100644 index 00000000..f2c2a672 --- /dev/null +++ b/modules/pam_faildelay/Makefile.in @@ -0,0 +1,667 @@ +# Makefile.in generated by automake 1.10.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY, to the extent permitted by law; without +# even the implied warranty of MERCHANTABILITY or FITNESS FOR A +# PARTICULAR PURPOSE. + +@SET_MAKE@ + +# +# Copyright (c) 2006 Thorsten Kukuk <kukuk@suse.de> +# + + +VPATH = @srcdir@ +pkgdatadir = $(datadir)/@PACKAGE@ +pkglibdir = $(libdir)/@PACKAGE@ +pkgincludedir = $(includedir)/@PACKAGE@ +am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd +install_sh_DATA = $(install_sh) -c -m 644 +install_sh_PROGRAM = $(install_sh) -c +install_sh_SCRIPT = $(install_sh) -c +INSTALL_HEADER = $(INSTALL_DATA) +transform = $(program_transform_name) +NORMAL_INSTALL = : +PRE_INSTALL = : +POST_INSTALL = : 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+@ENABLE_REGENERATE_MAN_TRUE@README: pam_faildelay.8.xml +@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_faildelay/README b/modules/pam_faildelay/README new file mode 100644 index 00000000..a06d7e3f --- /dev/null +++ b/modules/pam_faildelay/README @@ -0,0 +1,33 @@ +pam_faildelay — Change the delay on failure per-application + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +pam_faildelay is a PAM module that can be used to set the delay on failure +per-application. + +If no delay is given, pam_faildelay will use the value of FAIL_DELAY from /etc/ +login.defs. + +OPTIONS + +debug + + Turns on debugging messages sent to syslog. + +delay=N + + Set the delay on failure to N microseconds. + +EXAMPLES + +The following example will set the delay on failure to 10 seconds: + +auth optional pam_faildelay.so delay=10000000 + + +AUTHOR + +pam_faildelay was written by Darren Tucker <dtucker@zip.com.au>. + diff --git a/modules/pam_faildelay/README.xml b/modules/pam_faildelay/README.xml new file mode 100644 index 00000000..64d4accc --- /dev/null +++ b/modules/pam_faildelay/README.xml @@ -0,0 +1,41 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN" +"http://www.docbook.org/xml/4.4/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_faildelay.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_faildelay.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_faildelay-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_faildelay.8.xml" xpointer='xpointer(//refsect1[@id = "pam_faildelay-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_faildelay.8.xml" xpointer='xpointer(//refsect1[@id = "pam_faildelay-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_faildelay.8.xml" xpointer='xpointer(//refsect1[@id = "pam_faildelay-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_faildelay.8.xml" xpointer='xpointer(//refsect1[@id = "pam_faildelay-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_faildelay/pam_faildelay.8 b/modules/pam_faildelay/pam_faildelay.8 new file mode 100644 index 00000000..10e310a0 --- /dev/null +++ b/modules/pam_faildelay/pam_faildelay.8 @@ -0,0 +1,73 @@ +.\" Title: pam_faildelay +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_FAILDELAY" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_faildelay - Change the delay on failure per-application +.SH "SYNOPSIS" +.HP 17 +\fBpam_faildelay\.so\fR [debug] [delay=\fImicroseconds\fR] +.SH "DESCRIPTION" +.PP +pam_faildelay is a PAM module that can be used to set the delay on failure per\-application\. +.PP +If no +\fBdelay\fR +is given, pam_faildelay will use the value of FAIL_DELAY from +\fI/etc/login\.defs\fR\. +.SH "OPTIONS" +.PP +\fBdebug\fR +.RS 4 +Turns on debugging messages sent to syslog\. +.RE +.PP +\fBdelay=\fR\fB\fIN\fR\fR +.RS 4 +Set the delay on failure to N microseconds\. +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +Only the +\fBauth\fR +service is supported\. +.SH "RETURN VALUES" +.PP +PAM_IGNORE +.RS 4 +Delay was successful adjusted\. +.RE +.PP +PAM_SYSTEM_ERR +.RS 4 +The specified delay was not valid\. +.RE +.SH "EXAMPLES" +.PP +The following example will set the delay on failure to 10 seconds: +.sp +.RS 4 +.nf +auth optional pam_faildelay\.so delay=10000000 + +.fi +.RE +.sp +.SH "SEE ALSO" +.PP + +\fBpam_fail_delay\fR(3), +\fBpam.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_faildelay was written by Darren Tucker <dtucker@zip\.com\.au>\. diff --git a/modules/pam_faildelay/pam_faildelay.8.xml b/modules/pam_faildelay/pam_faildelay.8.xml new file mode 100644 index 00000000..d2dfd266 --- /dev/null +++ b/modules/pam_faildelay/pam_faildelay.8.xml @@ -0,0 +1,136 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN" + "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd"> + +<refentry id="pam_faildelay"> + + <refmeta> + <refentrytitle>pam_faildelay</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_faildelay-name"> + <refname>pam_faildelay</refname> + <refpurpose>Change the delay on failure per-application</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_faildelay-cmdsynopsis"> + <command>pam_faildelay.so</command> + <arg choice="opt"> + debug + </arg> + <arg choice="opt"> + delay=<replaceable>microseconds</replaceable> + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_faildelay-description"> + + <title>DESCRIPTION</title> + + <para> + pam_faildelay is a PAM module that can be used to set + the delay on failure per-application. + </para> + <para> + If no <option>delay</option> is given, pam_faildelay will + use the value of FAIL_DELAY from <filename>/etc/login.defs</filename>. + </para> + </refsect1> + + <refsect1 id="pam_faildelay-options"> + + <title>OPTIONS</title> + <variablelist> + <varlistentry> + <term> + <option>debug</option> + </term> + <listitem> + <para> + Turns on debugging messages sent to syslog. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>delay=<replaceable>N</replaceable></option> + </term> + <listitem> + <para> + Set the delay on failure to N microseconds. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_faildelay-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + Only the <option>auth</option> service is supported. + </para> + </refsect1> + + <refsect1 id='pam_faildelay-return_values'> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_IGNORE</term> + <listitem> + <para> + Delay was successful adjusted. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_SYSTEM_ERR</term> + <listitem> + <para> + The specified delay was not valid. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id='pam_faildelay-examples'> + <title>EXAMPLES</title> + <para> + The following example will set the delay on failure to + 10 seconds: + <programlisting> +auth optional pam_faildelay.so delay=10000000 + </programlisting> + </para> + </refsect1> + + <refsect1 id='pam_faildelay-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>pam_fail_delay</refentrytitle><manvolnum>3</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_faildelay-author'> + <title>AUTHOR</title> + <para> + pam_faildelay was written by Darren Tucker <dtucker@zip.com.au>. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_faildelay/pam_faildelay.c b/modules/pam_faildelay/pam_faildelay.c new file mode 100644 index 00000000..072b7dd3 --- /dev/null +++ b/modules/pam_faildelay/pam_faildelay.c @@ -0,0 +1,231 @@ +/* pam_faildelay module */ + +/* + * Allows an admin to set the delay on failure per-application. + * Provides "auth" interface only. + * + * Use by putting something like this in the relevant pam config: + * auth required pam_faildelay.so delay=[microseconds] + * + * eg: + * auth required pam_faildelay.so delay=10000000 + * will set the delay on failure to 10 seconds. + * + * If no delay option was given, pam_faildelay.so will use the + * FAIL_DELAY value of /etc/login.defs. + * + * Based on pam_rootok and parts of pam_unix both by Andrew Morgan + * <morgan@linux.kernel.org> + * + * Copyright (c) 2006 Thorsten Kukuk <kukuk@thkukuk.de> + * - Rewrite to use extended PAM functions + * - Add /etc/login.defs support + * + * Portions Copyright (c) 2005 Darren Tucker <dtucker at zip com au>. + * + * Redistribution and use in source and binary forms of, with + * or without modification, are permitted provided that the following + * conditions are met: + * + * 1. Redistributions of source code must retain any existing copyright + * notice, and this entire permission notice in its entirety, + * including the disclaimer of warranties. + * + * 2. Redistributions in binary form must reproduce all prior and current + * copyright notices, this list of conditions, and the following + * disclaimer in the documentation and/or other materials provided + * with the distribution. + * + * 3. The name of any author may not be used to endorse or promote + * products derived from this software without their specific prior + * written permission. + * + * ALTERNATIVELY, this product may be distributed under the terms of the + * GNU General Public License, in which case the provisions of the GNU + * GPL are required INSTEAD OF the above restrictions. (This clause is + * necessary due to a potential conflict between the GNU GPL and the + * restrictions contained in a BSD-style copyright.) + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR + * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE + * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH + * DAMAGE. + */ + +#include "config.h" + +#include <errno.h> +#include <ctype.h> +#include <stdio.h> +#include <limits.h> +#include <unistd.h> +#include <syslog.h> +#include <string.h> +#include <stdlib.h> + + +#define PAM_SM_AUTH + +#include <security/pam_modules.h> +#include <security/pam_ext.h> + + +#define BUF_SIZE 8192 +#define LOGIN_DEFS "/etc/login.defs" + +static char * +search_key (const char *filename) +{ + FILE *fp; + char *buf = NULL; + size_t buflen = 0; + char *retval = NULL; + + fp = fopen (filename, "r"); + if (NULL == fp) + return NULL; + + while (!feof (fp)) + { + char *tmp, *cp; +#if defined(HAVE_GETLINE) + ssize_t n = getline (&buf, &buflen, fp); +#elif defined (HAVE_GETDELIM) + ssize_t n = getdelim (&buf, &buflen, '\n', fp); +#else + ssize_t n; + + if (buf == NULL) + { + buflen = BUF_SIZE; + buf = malloc (buflen); + } + buf[0] = '\0'; + if (fgets (buf, buflen - 1, fp) == NULL) + break; + else if (buf != NULL) + n = strlen (buf); + else + n = 0; +#endif /* HAVE_GETLINE / HAVE_GETDELIM */ + cp = buf; + + if (n < 1) + break; + + tmp = strchr (cp, '#'); /* remove comments */ + if (tmp) + *tmp = '\0'; + while (isspace ((int)*cp)) /* remove spaces and tabs */ + ++cp; + if (*cp == '\0') /* ignore empty lines */ + continue; + + if (cp[strlen (cp) - 1] == '\n') + cp[strlen (cp) - 1] = '\0'; + + tmp = strsep (&cp, " \t="); + if (cp != NULL) + while (isspace ((int)*cp) || *cp == '=') + ++cp; + + if (strcasecmp (tmp, "FAIL_DELAY") == 0) + { + retval = strdup (cp); + break; + } + } + fclose (fp); + + free (buf); + + return retval; +} + + +/* --- authentication management functions (only) --- */ + +PAM_EXTERN +int pam_sm_authenticate(pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + int i, debug_flag = 0; + long int delay = -1; + + /* step through arguments */ + for (i = 0; i < argc; i++) { + if (sscanf(argv[i], "delay=%ld", &delay) == 1) { + /* sscanf did already everything necessary */ + } else if (strcmp (argv[i], "debug") == 0) + debug_flag = 1; + else + pam_syslog (pamh, LOG_ERR, "unknown option; %s", argv[i]); + } + + if (delay == -1) + { + char *endptr; + char *val = search_key (LOGIN_DEFS); + const char *val_orig = val; + + if (val == NULL) + return PAM_IGNORE; + + errno = 0; + delay = strtol (val, &endptr, 10) & 0777; + if (((delay == 0) && (val_orig == endptr)) || + ((delay == LONG_MIN || delay == LONG_MAX) && (errno == ERANGE))) + { + pam_syslog (pamh, LOG_ERR, "FAIL_DELAY=%s in %s not valid", + val, LOGIN_DEFS); + free (val); + return PAM_IGNORE; + } + + free (val); + /* delay is in seconds, convert to microseconds. */ + delay *= 1000000; + } + + if (debug_flag) + pam_syslog (pamh, LOG_DEBUG, "setting fail delay to %ld", delay); + + i = pam_fail_delay(pamh, delay); + if (i == PAM_SUCCESS) + return PAM_IGNORE; + else + return i; +} + +PAM_EXTERN +int pam_sm_setcred(pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_IGNORE; +} + + +#ifdef PAM_STATIC + +/* static module data */ + +struct pam_module _pam_faildelay_modstruct = { + "pam_faildelay", + pam_sm_authenticate, + pam_sm_setcred, + NULL, + NULL, + NULL, + NULL, +}; + +#endif + +/* end of module definition */ diff --git a/modules/pam_faildelay/tst-pam_faildelay b/modules/pam_faildelay/tst-pam_faildelay new file mode 100755 index 00000000..87f7fd44 --- /dev/null +++ b/modules/pam_faildelay/tst-pam_faildelay @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_faildelay.so diff --git a/modules/pam_filter/Makefile.am b/modules/pam_filter/Makefile.am new file mode 100644 index 00000000..ab2ceee9 --- /dev/null +++ b/modules/pam_filter/Makefile.am @@ -0,0 +1,34 @@ +# +# Copyright (c) 2005, 2006, 2007 Thorsten Kukuk <kukuk@thkukuk.de> +# + +SUBDIRS = upperLOWER + +CLEANFILES = *~ + +EXTRA_DIST = README $(MANS) $(XMLS) tst-pam_filter + +man_MANS = pam_filter.8 +XMLS = README.xml pam_filter.8.xml + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include +AM_LDFLAGS = -no-undefined -avoid-version -module +if 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install-exec \ + install-exec-am install-html install-html-am \ + install-includeHEADERS install-info install-info-am \ + install-man install-man8 install-pdf install-pdf-am install-ps \ + install-ps-am install-securelibLTLIBRARIES install-strip \ + installcheck installcheck-am installdirs installdirs-am \ + maintainer-clean maintainer-clean-generic mostlyclean \ + mostlyclean-compile mostlyclean-generic mostlyclean-libtool \ + pdf pdf-am ps ps-am tags tags-recursive uninstall uninstall-am \ + uninstall-includeHEADERS uninstall-man uninstall-man8 \ + uninstall-securelibLTLIBRARIES + +@ENABLE_REGENERATE_MAN_TRUE@README: pam_filter.8.xml +@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_filter/README b/modules/pam_filter/README new file mode 100644 index 00000000..4d4e2194 --- /dev/null +++ b/modules/pam_filter/README @@ -0,0 +1,78 @@ +pam_filter — PAM filter module + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +This module is intended to be a platform for providing access to all of the +input/output that passes between the user and the application. It is only +suitable for tty-based and (stdin/stdout) applications. + +To function this module requires filters to be installed on the system. The +single filter provided with the module simply transposes upper and lower case +letters in the input and output streams. (This can be very annoying and is not +kind to termcap based editors). + +Each component of the module has the potential to invoke the desired filter. +The filter is always execv(2) with the privilege of the calling application and +not that of the user. For this reason it cannot usually be killed by the user +without closing their session. + +OPTIONS + +debug + + Print debug information. + +new_term + + The default action of the filter is to set the PAM_TTY item to indicate the + terminal that the user is using to connect to the application. This + argument indicates that the filter should set PAM_TTY to the filtered + pseudo-terminal. + +non_term + + don't try to set the PAM_TTY item. + +runX + + In order that the module can invoke a filter it should know when to invoke + it. This argument is required to tell the filter when to do this. + + Permitted values for X are 1 and 2. These indicate the precise time that + the filter is to be run. To understand this concept it will be useful to + have read the pam(3) manual page. Basically, for each management group + there are up to two ways of calling the module's functions. In the case of + the authentication and session components there are actually two separate + functions. For the case of authentication, these functions are + pam_authenticate(3) and pam_setcred(3), here run1 means run the filter from + the pam_authenticate function and run2 means run the filter from + pam_setcred. In the case of the session modules, run1 implies that the + filter is invoked at the pam_open_session(3) stage, and run2 for + pam_close_session(3). + + For the case of the account component. Either run1 or run2 may be used. + + For the case of the password component, run1 is used to indicate that the + filter is run on the first occasion of pam_chauthtok(3) (the + PAM_PRELIM_CHECK phase) and run2 is used to indicate that the filter is run + on the second occasion (the PAM_UPDATE_AUTHTOK phase). + +filter + + The full pathname of the filter to be run and any command line arguments + that the filter might expect. + +EXAMPLES + +Add the following line to /etc/pam.d/login to see how to configure login to +transpose upper and lower case letters once the user has logged in: + + session required pam_filter.so run1 /lib/security/pam_filter/upperLOWER + + +AUTHOR + +pam_filter was written by Andrew G. Morgan <morgan@kernel.org>. + diff --git a/modules/pam_filter/README.xml b/modules/pam_filter/README.xml new file mode 100644 index 00000000..b76cb743 --- /dev/null +++ b/modules/pam_filter/README.xml @@ -0,0 +1,41 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_filter.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_filter.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_filter-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_filter.8.xml" xpointer='xpointer(//refsect1[@id = "pam_filter-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_filter.8.xml" xpointer='xpointer(//refsect1[@id = "pam_filter-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_filter.8.xml" xpointer='xpointer(//refsect1[@id = "pam_filter-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_filter.8.xml" xpointer='xpointer(//refsect1[@id = "pam_filter-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_filter/pam_filter.8 b/modules/pam_filter/pam_filter.8 new file mode 100644 index 00000000..eec58fe7 --- /dev/null +++ b/modules/pam_filter/pam_filter.8 @@ -0,0 +1,154 @@ +.\" Title: pam_filter +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_FILTER" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_filter - PAM filter module +.SH "SYNOPSIS" +.HP 14 +\fBpam_filter\.so\fR [debug] [new_term] [non_term] run1|run2 \fIfilter\fR [\fI\.\.\.\fR] +.SH "DESCRIPTION" +.PP +This module is intended to be a platform for providing access to all of the input/output that passes between the user and the application\. It is only suitable for tty\-based and (stdin/stdout) applications\. +.PP +To function this module requires +\fIfilters\fR +to be installed on the system\. The single filter provided with the module simply transposes upper and lower case letters in the input and output streams\. (This can be very annoying and is not kind to termcap based editors)\. +.PP +Each component of the module has the potential to invoke the desired filter\. The filter is always +\fBexecv\fR(2) +with the privilege of the calling application and +\fInot\fR +that of the user\. For this reason it cannot usually be killed by the user without closing their session\. +.SH "OPTIONS" +.PP +.PP +\fBdebug\fR +.RS 4 +Print debug information\. +.RE +.PP +\fBnew_term\fR +.RS 4 +The default action of the filter is to set the +\fIPAM_TTY\fR +item to indicate the terminal that the user is using to connect to the application\. This argument indicates that the filter should set +\fIPAM_TTY\fR +to the filtered pseudo\-terminal\. +.RE +.PP +\fBnon_term\fR +.RS 4 +don\'t try to set the +\fIPAM_TTY\fR +item\. +.RE +.PP +\fBrunX\fR +.RS 4 +In order that the module can invoke a filter it should know when to invoke it\. This argument is required to tell the filter when to do this\. +.sp +Permitted values for +\fIX\fR +are +\fI1\fR +and +\fI2\fR\. These indicate the precise time that the filter is to be run\. To understand this concept it will be useful to have read the +\fBpam\fR(3) +manual page\. Basically, for each management group there are up to two ways of calling the module\'s functions\. In the case of the +\fIauthentication\fR +and +\fIsession\fR +components there are actually two separate functions\. For the case of authentication, these functions are +\fBpam_authenticate\fR(3) +and +\fBpam_setcred\fR(3), here +\fBrun1\fR +means run the filter from the +\fBpam_authenticate\fR +function and +\fBrun2\fR +means run the filter from +\fBpam_setcred\fR\. In the case of the session modules, +\fIrun1\fR +implies that the filter is invoked at the +\fBpam_open_session\fR(3) +stage, and +\fIrun2\fR +for +\fBpam_close_session\fR(3)\. +.sp +For the case of the account component\. Either +\fIrun1\fR +or +\fIrun2\fR +may be used\. +.sp +For the case of the password component, +\fIrun1\fR +is used to indicate that the filter is run on the first occasion of +\fBpam_chauthtok\fR(3) +(the +\fIPAM_PRELIM_CHECK\fR +phase) and +\fIrun2\fR +is used to indicate that the filter is run on the second occasion (the +\fIPAM_UPDATE_AUTHTOK\fR +phase)\. +.RE +.PP +\fBfilter\fR +.RS 4 +The full pathname of the filter to be run and any command line arguments that the filter might expect\. +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +The services +\fBauth\fR, +\fBaccount\fR, +\fBpassword\fR +and +\fBsession\fR +are supported\. +.SH "RETURN VALUES" +.PP +.PP +PAM_SUCCESS +.RS 4 +The new filter was set successfull\. +.RE +.PP +PAM_ABORT +.RS 4 +Critical error, immediate abort\. +.RE +.SH "EXAMPLES" +.PP +Add the following line to +\fI/etc/pam\.d/login\fR +to see how to configure login to transpose upper and lower case letters once the user has logged in: +.sp +.RS 4 +.nf + session required pam_filter\.so run1 /lib/security/pam_filter/upperLOWER + +.fi +.RE +.sp +.SH "SEE ALSO" +.PP + +\fBpam.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_filter was written by Andrew G\. Morgan <morgan@kernel\.org>\. diff --git a/modules/pam_filter/pam_filter.8.xml b/modules/pam_filter/pam_filter.8.xml new file mode 100644 index 00000000..d15d7e97 --- /dev/null +++ b/modules/pam_filter/pam_filter.8.xml @@ -0,0 +1,261 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_filter"> + + <refmeta> + <refentrytitle>pam_filter</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_filter-name"> + <refname>pam_filter</refname> + <refpurpose>PAM filter module</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_filter-cmdsynopsis"> + <command>pam_filter.so</command> + <arg choice="opt"> + debug + </arg> + <arg choice="opt"> + new_term + </arg> + <arg choice="opt"> + non_term + </arg> + <arg choice="plain"> + run1|run2 + </arg> + <arg choice="plain"> + <replaceable>filter</replaceable> + </arg> + <arg choice="opt"> + <replaceable>...</replaceable> + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_filter-description"> + + <title>DESCRIPTION</title> + + <para> + This module is intended to be a platform for providing access to all + of the input/output that passes between the user and the application. + It is only suitable for tty-based and (stdin/stdout) applications. + </para> + <para> + To function this module requires <emphasis>filters</emphasis> to be + installed on the system. + The single filter provided with the module simply transposes upper and + lower case letters in the input and output streams. (This can be very + annoying and is not kind to termcap based editors). + </para> + <para> + Each component of the module has the potential to invoke the + desired filter. The filter is always + <citerefentry> + <refentrytitle>execv</refentrytitle><manvolnum>2</manvolnum> + </citerefentry> with the privilege of the calling application + and <emphasis>not</emphasis> that of the user. For this reason it + cannot usually be killed by the user without closing their session. + </para> + </refsect1> + + <refsect1 id="pam_filter-options"> + + <title>OPTIONS</title> + <para> + <variablelist> + + <varlistentry> + <term> + <option>debug</option> + </term> + <listitem> + <para> + Print debug information. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>new_term</option> + </term> + <listitem> + <para> + The default action of the filter is to set the + <emphasis>PAM_TTY</emphasis> item to indicate the + terminal that the user is using to connect to the + application. This argument indicates that the filter + should set <emphasis>PAM_TTY</emphasis> to the filtered + pseudo-terminal. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>non_term</option> + </term> + <listitem> + <para> + don't try to set the <emphasis>PAM_TTY</emphasis> item. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>runX</option> + </term> + <listitem> + <para> + In order that the module can invoke a filter it should + know when to invoke it. This argument is required to tell + the filter when to do this. + </para> + <para> + Permitted values for <emphasis>X</emphasis> are + <emphasis>1</emphasis> and <emphasis>2</emphasis>. These + indicate the precise time that the filter is to be run. + To understand this concept it will be useful to have read + the <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>3</manvolnum> + </citerefentry> manual page. + Basically, for each management group there are up to two ways + of calling the module's functions. + In the case of the <emphasis>authentication</emphasis> and + <emphasis>session</emphasis> components there are actually + two separate functions. For the case of authentication, these + functions are + <citerefentry> + <refentrytitle>pam_authenticate</refentrytitle><manvolnum>3</manvolnum> + </citerefentry> and + <citerefentry> + <refentrytitle>pam_setcred</refentrytitle><manvolnum>3</manvolnum> + </citerefentry>, here <option>run1</option> means run the + filter from the <function>pam_authenticate</function> function + and <option>run2</option> means run the filter from + <function>pam_setcred</function>. In the case of the + session modules, <emphasis>run1</emphasis> implies + that the filter is invoked at the + <citerefentry> + <refentrytitle>pam_open_session</refentrytitle><manvolnum>3</manvolnum> + </citerefentry> stage, and <emphasis>run2</emphasis> for + <citerefentry> + <refentrytitle>pam_close_session</refentrytitle><manvolnum>3</manvolnum> + </citerefentry>. + </para> + <para> + For the case of the account component. Either + <emphasis>run1</emphasis> or <emphasis>run2</emphasis> + may be used. + </para> + <para> + For the case of the password component, <emphasis>run1</emphasis> + is used to indicate that the filter is run on the first + occasion of + <citerefentry> + <refentrytitle>pam_chauthtok</refentrytitle><manvolnum>3</manvolnum> + </citerefentry> (the <emphasis>PAM_PRELIM_CHECK</emphasis> + phase) and <emphasis>run2</emphasis> is used to indicate + that the filter is run on the second occasion (the + <emphasis>PAM_UPDATE_AUTHTOK</emphasis> phase). + + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>filter</option> + </term> + <listitem> + <para> + The full pathname of the filter to be run and any command line + arguments that the filter might expect. + </para> + </listitem> + </varlistentry> + </variablelist> + + </para> + </refsect1> + + <refsect1 id="pam_filter-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + The services <option>auth</option>, <option>account</option>, + <option>password</option> and <option>session</option> are supported. + </para> + </refsect1> + + <refsect1 id='pam_filter-return_values'> + <title>RETURN VALUES</title> + <para> + <variablelist> + + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + The new filter was set successfull. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_ABORT</term> + <listitem> + <para> + Critical error, immediate abort. + </para> + </listitem> + </varlistentry> + + </variablelist> + </para> + </refsect1> + + <refsect1 id='pam_filter-examples'> + <title>EXAMPLES</title> + <para> + Add the following line to <filename>/etc/pam.d/login</filename> to + see how to configure login to transpose upper and lower case letters + once the user has logged in: + + <programlisting> + session required pam_filter.so run1 /lib/security/pam_filter/upperLOWER + </programlisting> + </para> + </refsect1> + + <refsect1 id='pam_filter-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_filter-author'> + <title>AUTHOR</title> + <para> + pam_filter was written by Andrew G. Morgan <morgan@kernel.org>. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_filter/pam_filter.c b/modules/pam_filter/pam_filter.c new file mode 100644 index 00000000..1c7731b3 --- /dev/null +++ b/modules/pam_filter/pam_filter.c @@ -0,0 +1,744 @@ +/* + * $Id: pam_filter.c,v 1.12 2005/12/12 14:45:00 ldv Exp $ + * + * written by Andrew Morgan <morgan@transmeta.com> with much help from + * Richard Stevens' UNIX Network Programming book. + */ + +#include "config.h" + +#include <stdlib.h> +#include <syslog.h> +#include <unistd.h> +#include <fcntl.h> +#include <string.h> + +#include <stdio.h> +#include <sys/types.h> +#include <sys/wait.h> +#include <sys/time.h> +#include <sys/file.h> +#include <sys/stat.h> +#include <sys/socket.h> +#include <sys/ioctl.h> +#include <termios.h> + +#include <signal.h> + +#define PAM_SM_AUTH +#define PAM_SM_ACCOUNT +#define PAM_SM_SESSION +#define PAM_SM_PASSWORD + +#include <security/pam_modules.h> +#include <security/pam_ext.h> +#include "pam_filter.h" + +/* ------ some tokens used for convenience throughout this file ------- */ + +#define FILTER_DEBUG 01 +#define FILTER_RUN1 02 +#define FILTER_RUN2 04 +#define NEW_TERM 010 +#define NON_TERM 020 + +/* -------------------------------------------------------------------- */ + +/* log errors */ + +#include <stdarg.h> + +#define TERMINAL_LEN 12 + +static int +master (const pam_handle_t *pamh, char *terminal) +/* + * try to open all of the terminals in sequence return first free one, + * or -1 + */ +{ + const char ptys[] = "pqrs", *pty = ptys; + const char hexs[] = "0123456789abcdef", *hex; + struct stat tstat; + int fd; + + strcpy(terminal, "/dev/pty??"); + + while (*pty) { /* step through four types */ + terminal[8] = *pty++; + terminal[9] = '0'; + if (stat(terminal,&tstat) < 0) { + pam_syslog(pamh, LOG_WARNING, + "unknown pseudo terminal: %s", terminal); + break; + } + for (hex = hexs; *hex; ) { /* step through 16 of these */ + terminal[9] = *hex++; + if ((fd = open(terminal, O_RDWR)) >= 0) { + return fd; + } + } + } + + /* no terminal found */ + + return -1; +} + +static int process_args(pam_handle_t *pamh + , int argc, const char **argv, const char *type + , char ***evp, const char **filtername) +{ + int ctrl=0; + + while (argc-- > 0) { + if (strcmp("debug",*argv) == 0) { + ctrl |= FILTER_DEBUG; + } else if (strcmp("new_term",*argv) == 0) { + ctrl |= NEW_TERM; + } else if (strcmp("non_term",*argv) == 0) { + ctrl |= NON_TERM; + } else if (strcmp("run1",*argv) == 0) { + ctrl |= FILTER_RUN1; + if (argc <= 0) { + pam_syslog(pamh, LOG_ALERT, "no run filter supplied"); + } else + break; + } else if (strcmp("run2",*argv) == 0) { + ctrl |= FILTER_RUN2; + if (argc <= 0) { + pam_syslog(pamh, LOG_ALERT, "no run filter supplied"); + } else + break; + } else { + pam_syslog(pamh, LOG_ERR, "unrecognized option: %s", *argv); + } + ++argv; /* step along list */ + } + + if (argc < 0) { + /* there was no reference to a filter */ + *filtername = NULL; + *evp = NULL; + } else { + char **levp; + const char *user = NULL; + const void *tmp; + int i,size, retval; + + *filtername = *++argv; + if (ctrl & FILTER_DEBUG) { + pam_syslog(pamh, LOG_DEBUG, "will run filter %s", *filtername); + } + + levp = (char **) malloc(5*sizeof(char *)); + if (levp == NULL) { + pam_syslog(pamh, LOG_CRIT, "no memory for environment of filter"); + return -1; + } + + for (size=i=0; i<argc; ++i) { + size += strlen(argv[i])+1; + } + + /* the "ARGS" variable */ + +#define ARGS_OFFSET 5 /* strlen('ARGS='); */ +#define ARGS_NAME "ARGS=" + + size += ARGS_OFFSET; + + levp[0] = (char *) malloc(size); + if (levp[0] == NULL) { + pam_syslog(pamh, LOG_CRIT, "no memory for filter arguments"); + if (levp) { + free(levp); + } + return -1; + } + + strncpy(levp[0],ARGS_NAME,ARGS_OFFSET); + for (i=0,size=ARGS_OFFSET; i<argc; ++i) { + strcpy(levp[0]+size, argv[i]); + size += strlen(argv[i]); + levp[0][size++] = ' '; + } + levp[0][--size] = '\0'; /* <NUL> terminate */ + + /* the "SERVICE" variable */ + +#define SERVICE_OFFSET 8 /* strlen('SERVICE='); */ +#define SERVICE_NAME "SERVICE=" + + retval = pam_get_item(pamh, PAM_SERVICE, &tmp); + if (retval != PAM_SUCCESS || tmp == NULL) { + pam_syslog(pamh, LOG_CRIT, "service name not found"); + if (levp) { + free(levp[0]); + free(levp); + } + return -1; + } + size = SERVICE_OFFSET+strlen(tmp); + + levp[1] = (char *) malloc(size+1); + if (levp[1] == NULL) { + pam_syslog(pamh, LOG_CRIT, "no memory for service name"); + if (levp) { + free(levp[0]); + free(levp); + } + return -1; + } + + strncpy(levp[1],SERVICE_NAME,SERVICE_OFFSET); + strcpy(levp[1]+SERVICE_OFFSET, tmp); + levp[1][size] = '\0'; /* <NUL> terminate */ + + /* the "USER" variable */ + +#define USER_OFFSET 5 /* strlen('USER='); */ +#define USER_NAME "USER=" + + pam_get_user(pamh, &user, NULL); + if (user == NULL) { + user = "<unknown>"; + } + size = USER_OFFSET+strlen(user); + + levp[2] = (char *) malloc(size+1); + if (levp[2] == NULL) { + pam_syslog(pamh, LOG_CRIT, "no memory for user's name"); + if (levp) { + free(levp[1]); + free(levp[0]); + free(levp); + } + return -1; + } + + strncpy(levp[2],USER_NAME,USER_OFFSET); + strcpy(levp[2]+USER_OFFSET, user); + levp[2][size] = '\0'; /* <NUL> terminate */ + + /* the "USER" variable */ + +#define TYPE_OFFSET 5 /* strlen('TYPE='); */ +#define TYPE_NAME "TYPE=" + + size = TYPE_OFFSET+strlen(type); + + levp[3] = (char *) malloc(size+1); + if (levp[3] == NULL) { + pam_syslog(pamh, LOG_CRIT, "no memory for type"); + if (levp) { + free(levp[2]); + free(levp[1]); + free(levp[0]); + free(levp); + } + return -1; + } + + strncpy(levp[3],TYPE_NAME,TYPE_OFFSET); + strcpy(levp[3]+TYPE_OFFSET, type); + levp[3][size] = '\0'; /* <NUL> terminate */ + + levp[4] = NULL; /* end list */ + + *evp = levp; + } + + if ((ctrl & FILTER_DEBUG) && *filtername) { + char **e; + + pam_syslog(pamh, LOG_DEBUG, "filter[%s]: %s", type, *filtername); + pam_syslog(pamh, LOG_DEBUG, "environment:"); + for (e=*evp; e && *e; ++e) { + pam_syslog(pamh, LOG_DEBUG, " %s", *e); + } + } + + return ctrl; +} + +static void free_evp(char *evp[]) +{ + int i; + + if (evp) + for (i=0; i<4; ++i) { + if (evp[i]) + free(evp[i]); + } + free(evp); +} + +static int +set_filter (pam_handle_t *pamh, int flags UNUSED, int ctrl, + const char **evp, const char *filtername) +{ + int status=-1; + char terminal[TERMINAL_LEN]; + struct termios stored_mode; /* initial terminal mode settings */ + int fd[2], child=0, child2=0, aterminal; + + if (filtername == NULL || *filtername != '/') { + pam_syslog(pamh, LOG_ALERT, + "filtername not permitted; full pathname required"); + return PAM_ABORT; + } + + if (!isatty(STDIN_FILENO) || !isatty(STDOUT_FILENO)) { + aterminal = 0; + } else { + aterminal = 1; + } + + if (aterminal) { + + /* open the master pseudo terminal */ + + fd[0] = master(pamh,terminal); + if (fd[0] < 0) { + pam_syslog(pamh, LOG_CRIT, "no master terminal"); + return PAM_AUTH_ERR; + } + + /* set terminal into raw mode.. remember old mode so that we can + revert to it after the child has quit. */ + + /* this is termios terminal handling... */ + + if ( tcgetattr(STDIN_FILENO, &stored_mode) < 0 ) { + pam_syslog(pamh, LOG_CRIT, "couldn't copy terminal mode: %m"); + /* in trouble, so close down */ + close(fd[0]); + return PAM_ABORT; + } else { + struct termios t_mode = stored_mode; + + t_mode.c_iflag = 0; /* no input control */ + t_mode.c_oflag &= ~OPOST; /* no ouput post processing */ + + /* no signals, canonical input, echoing, upper/lower output */ +#ifdef XCASE + t_mode.c_lflag &= ~(XCASE); +#endif + t_mode.c_lflag &= ~(ISIG|ICANON|ECHO); + t_mode.c_cflag &= ~(CSIZE|PARENB); /* no parity */ + t_mode.c_cflag |= CS8; /* 8 bit chars */ + + t_mode.c_cc[VMIN] = 1; /* number of chars to satisfy a read */ + t_mode.c_cc[VTIME] = 0; /* 0/10th second for chars */ + + if ( tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_mode) < 0 ) { + pam_syslog(pamh, LOG_WARNING, + "couldn't put terminal in RAW mode: %m"); + close(fd[0]); + return PAM_ABORT; + } + + /* + * NOTE: Unlike the stream socket case here the child + * opens the slave terminal as fd[1] *after* the fork... + */ + } + } else { + + /* + * not a terminal line so just open a stream socket fd[0-1] + * both set... + */ + + if ( socketpair(AF_UNIX, SOCK_STREAM, 0, fd) < 0 ) { + pam_syslog(pamh, LOG_CRIT, "couldn't open a stream pipe: %m"); + return PAM_ABORT; + } + } + + /* start child process */ + + if ( (child = fork()) < 0 ) { + + pam_syslog(pamh, LOG_WARNING, "first fork failed: %m"); + if (aterminal) { + (void) tcsetattr(STDIN_FILENO, TCSAFLUSH, &stored_mode); + } + + return PAM_AUTH_ERR; + } + + if ( child == 0 ) { /* child process *is* application */ + + if (aterminal) { + + /* close the controlling tty */ + +#if defined(__hpux) && defined(O_NOCTTY) + int t = open("/dev/tty", O_RDWR|O_NOCTTY); +#else + int t = open("/dev/tty",O_RDWR); + if (t > 0) { + (void) ioctl(t, TIOCNOTTY, NULL); + close(t); + } +#endif /* defined(__hpux) && defined(O_NOCTTY) */ + + /* make this process it's own process leader */ + if (setsid() == -1) { + pam_syslog(pamh, LOG_WARNING, + "child cannot become new session: %m"); + return PAM_ABORT; + } + + /* find slave's name */ + terminal[5] = 't'; /* want to open slave terminal */ + fd[1] = open(terminal, O_RDWR); + close(fd[0]); /* process is the child -- uses line fd[1] */ + + if (fd[1] < 0) { + pam_syslog(pamh, LOG_WARNING, + "cannot open slave terminal: %s: %m", terminal); + return PAM_ABORT; + } + + /* initialize the child's terminal to be the way the + parent's was before we set it into RAW mode */ + + if ( tcsetattr(fd[1], TCSANOW, &stored_mode) < 0 ) { + pam_syslog(pamh, LOG_WARNING, + "cannot set slave terminal mode: %s: %m", terminal); + close(fd[1]); + return PAM_ABORT; + } + + } else { + + /* nothing to do for a simple stream socket */ + + } + + /* re-assign the stdin/out to fd[1] <- (talks to filter). */ + + if ( dup2(fd[1],STDIN_FILENO) != STDIN_FILENO || + dup2(fd[1],STDOUT_FILENO) != STDOUT_FILENO || + dup2(fd[1],STDERR_FILENO) != STDERR_FILENO ) { + pam_syslog(pamh, LOG_WARNING, + "unable to re-assign STDIN/OUT/ERR: %m"); + close(fd[1]); + return PAM_ABORT; + } + + /* make sure that file descriptors survive 'exec's */ + + if ( fcntl(STDIN_FILENO, F_SETFD, 0) || + fcntl(STDOUT_FILENO,F_SETFD, 0) || + fcntl(STDERR_FILENO,F_SETFD, 0) ) { + pam_syslog(pamh, LOG_WARNING, + "unable to re-assign STDIN/OUT/ERR: %m"); + return PAM_ABORT; + } + + /* now the user input is read from the parent/filter: forget fd */ + + close(fd[1]); + + /* the current process is now aparently working with filtered + stdio/stdout/stderr --- success! */ + + return PAM_SUCCESS; + } + + /* + * process is the parent here. So we can close the application's + * input/output + */ + + close(fd[1]); + + /* Clear out passwords... there is a security problem here in + * that this process never executes pam_end. Consequently, any + * other sensitive data in this process is *not* explicitly + * overwritten, before the process terminates */ + + (void) pam_set_item(pamh, PAM_AUTHTOK, NULL); + (void) pam_set_item(pamh, PAM_OLDAUTHTOK, NULL); + + /* fork a copy of process to run the actual filter executable */ + + if ( (child2 = fork()) < 0 ) { + + pam_syslog(pamh, LOG_WARNING, "filter fork failed: %m"); + child2 = 0; + + } else if ( child2 == 0 ) { /* exec the child filter */ + + if ( dup2(fd[0],APPIN_FILENO) != APPIN_FILENO || + dup2(fd[0],APPOUT_FILENO) != APPOUT_FILENO || + dup2(fd[0],APPERR_FILENO) != APPERR_FILENO ) { + pam_syslog(pamh, LOG_WARNING, + "unable to re-assign APPIN/OUT/ERR: %m"); + close(fd[0]); + exit(1); + } + + /* make sure that file descriptors survive 'exec's */ + + if ( fcntl(APPIN_FILENO, F_SETFD, 0) == -1 || + fcntl(APPOUT_FILENO,F_SETFD, 0) == -1 || + fcntl(APPERR_FILENO,F_SETFD, 0) == -1 ) { + pam_syslog(pamh, LOG_WARNING, + "unable to retain APPIN/OUT/ERR: %m"); + close(APPIN_FILENO); + close(APPOUT_FILENO); + close(APPERR_FILENO); + exit(1); + } + + /* now the user input is read from the parent through filter */ + + execle(filtername, "<pam_filter>", NULL, evp); + + /* getting to here is an error */ + + pam_syslog(pamh, LOG_ALERT, "filter: %s: %m", filtername); + + } else { /* wait for either of the two children to exit */ + + while (child && child2) { /* loop if there are two children */ + int lstatus=0; + int chid; + + chid = wait(&lstatus); + if (chid == child) { + + if (WIFEXITED(lstatus)) { /* exited ? */ + status = WEXITSTATUS(lstatus); + } else if (WIFSIGNALED(lstatus)) { /* killed ? */ + status = -1; + } else + continue; /* just stopped etc.. */ + child = 0; /* the child has exited */ + + } else if (chid == child2) { + /* + * if the filter has exited. Let the child die + * naturally below + */ + if (WIFEXITED(lstatus) || WIFSIGNALED(lstatus)) + child2 = 0; + } else { + + pam_syslog(pamh, LOG_ALERT, + "programming error <chid=%d,lstatus=%x> " + "in file %s at line %d", + chid, lstatus, __FILE__, __LINE__); + child = child2 = 0; + status = -1; + + } + } + } + + close(fd[0]); + + /* if there is something running, wait for it to exit */ + + while (child || child2) { + int lstatus=0; + int chid; + + chid = wait(&lstatus); + + if (child && chid == child) { + + if (WIFEXITED(lstatus)) { /* exited ? */ + status = WEXITSTATUS(lstatus); + } else if (WIFSIGNALED(lstatus)) { /* killed ? */ + status = -1; + } else + continue; /* just stopped etc.. */ + child = 0; /* the child has exited */ + + } else if (child2 && chid == child2) { + + if (WIFEXITED(lstatus) || WIFSIGNALED(lstatus)) + child2 = 0; + + } else { + + pam_syslog(pamh, LOG_ALERT, + "programming error <chid=%d,lstatus=%x> " + "in file %s at line %d", + chid, lstatus, __FILE__, __LINE__); + child = child2 = 0; + status = -1; + + } + } + + if (aterminal) { + /* reset to initial terminal mode */ + (void) tcsetattr(STDIN_FILENO, TCSANOW, &stored_mode); + } + + if (ctrl & FILTER_DEBUG) { + pam_syslog(pamh, LOG_DEBUG, "parent process exited"); /* clock off */ + } + + /* quit the parent process, returning the child's exit status */ + + exit(status); + return status; /* never reached, to make gcc happy */ +} + +static int set_the_terminal(pam_handle_t *pamh) +{ + const void *tty; + + if (pam_get_item(pamh, PAM_TTY, &tty) != PAM_SUCCESS + || tty == NULL) { + tty = ttyname(STDIN_FILENO); + if (tty == NULL) { + pam_syslog(pamh, LOG_ERR, "couldn't get the tty name"); + return PAM_ABORT; + } + if (pam_set_item(pamh, PAM_TTY, tty) != PAM_SUCCESS) { + pam_syslog(pamh, LOG_ERR, "couldn't set tty name"); + return PAM_ABORT; + } + } + return PAM_SUCCESS; +} + +static int need_a_filter(pam_handle_t *pamh + , int flags, int argc, const char **argv + , const char *name, int which_run) +{ + int ctrl; + char **evp; + const char *filterfile; + int retval; + + ctrl = process_args(pamh, argc, argv, name, &evp, &filterfile); + if (ctrl == -1) { + return PAM_AUTHINFO_UNAVAIL; + } + + /* set the tty to the old or the new one? */ + + if (!(ctrl & NON_TERM) && !(ctrl & NEW_TERM)) { + retval = set_the_terminal(pamh); + if (retval != PAM_SUCCESS) { + pam_syslog(pamh, LOG_ERR, "tried and failed to set PAM_TTY"); + } + } else { + retval = PAM_SUCCESS; /* nothing to do which is always a success */ + } + + if (retval == PAM_SUCCESS && (ctrl & which_run)) { + retval = set_filter(pamh, flags, ctrl + , (const char **)evp, filterfile); + } + + if (retval == PAM_SUCCESS + && !(ctrl & NON_TERM) && (ctrl & NEW_TERM)) { + retval = set_the_terminal(pamh); + if (retval != PAM_SUCCESS) { + pam_syslog(pamh, LOG_ERR, + "tried and failed to set new terminal as PAM_TTY"); + } + } + + free_evp(evp); + + if (ctrl & FILTER_DEBUG) { + pam_syslog(pamh, LOG_DEBUG, "filter/%s, returning %d", name, retval); + pam_syslog(pamh, LOG_DEBUG, "[%s]", pam_strerror(pamh, retval)); + } + + return retval; +} + +/* ----------------- public functions ---------------- */ + +/* + * here are the advertised access points ... + */ + +/* ------------------ authentication ----------------- */ + +PAM_EXTERN int pam_sm_authenticate(pam_handle_t *pamh + , int flags, int argc, const char **argv) +{ + return need_a_filter(pamh, flags, argc, argv + , "authenticate", FILTER_RUN1); +} + +PAM_EXTERN int pam_sm_setcred(pam_handle_t *pamh, int flags + , int argc, const char **argv) +{ + return need_a_filter(pamh, flags, argc, argv, "setcred", FILTER_RUN2); +} + +/* --------------- account management ---------------- */ + +PAM_EXTERN int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, int argc, + const char **argv) +{ + return need_a_filter(pamh, flags, argc, argv + , "setcred", FILTER_RUN1|FILTER_RUN2 ); +} + +/* --------------- session management ---------------- */ + +PAM_EXTERN int pam_sm_open_session(pam_handle_t *pamh, int flags + , int argc, const char **argv) +{ + return need_a_filter(pamh, flags, argc, argv + , "open_session", FILTER_RUN1); +} + +PAM_EXTERN int pam_sm_close_session(pam_handle_t *pamh, int flags + , int argc, const char **argv) +{ + return need_a_filter(pamh, flags, argc, argv + , "close_session", FILTER_RUN2); +} + +/* --------- updating authentication tokens --------- */ + + +PAM_EXTERN int pam_sm_chauthtok(pam_handle_t *pamh, int flags + , int argc, const char **argv) +{ + int runN; + + if (flags & PAM_PRELIM_CHECK) + runN = FILTER_RUN1; + else if (flags & PAM_UPDATE_AUTHTOK) + runN = FILTER_RUN2; + else { + pam_syslog(pamh, LOG_ERR, "unknown flags for chauthtok (0x%X)", flags); + return PAM_TRY_AGAIN; + } + + return need_a_filter(pamh, flags, argc, argv, "chauthtok", runN); +} + +#ifdef PAM_STATIC + +/* ------------ stuff for static modules ------------ */ + +struct pam_module _pam_filter_modstruct = { + "pam_filter", + pam_sm_authenticate, + pam_sm_setcred, + pam_sm_acct_mgmt, + pam_sm_open_session, + pam_sm_close_session, + pam_sm_chauthtok, +}; + +#endif diff --git a/modules/pam_filter/pam_filter.h b/modules/pam_filter/pam_filter.h new file mode 100644 index 00000000..d15d113c --- /dev/null +++ b/modules/pam_filter/pam_filter.h @@ -0,0 +1,32 @@ +/* + * $Id: pam_filter.h,v 1.1 2005/08/16 12:27:42 kukuk Exp $ + * + * this file is associated with the Linux-PAM filter module. + * it was written by Andrew G. Morgan <morgan@linux.kernel.org> + * + */ + +#ifndef PAM_FILTER_H +#define PAM_FILTER_H + +#include <sys/file.h> + +/* + * this will fail if there is some problem with these file descriptors + * being allocated by the pam_filter Linux-PAM module. The numbers + * here are thought safe, but the filter developer should use the + * macros, as these numbers are subject to change. + * + * The APPXXX_FILENO file descriptors are the STDIN/OUT/ERR_FILENO of the + * application. The filter uses the STDIN/OUT/ERR_FILENO's to converse + * with the user, passes (modified) user input to the application via + * APPIN_FILENO, and receives application output from APPOUT_FILENO/ERR. + */ + +#define APPIN_FILENO 3 /* write here to give application input */ +#define APPOUT_FILENO 4 /* read here to get application output */ +#define APPERR_FILENO 5 /* read here to get application errors */ + +#define APPTOP_FILE 6 /* used by select */ + +#endif diff --git a/modules/pam_filter/tst-pam_filter b/modules/pam_filter/tst-pam_filter new file mode 100755 index 00000000..56a5d083 --- /dev/null +++ b/modules/pam_filter/tst-pam_filter @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_filter.so diff --git a/modules/pam_filter/upperLOWER/Makefile.am b/modules/pam_filter/upperLOWER/Makefile.am new file mode 100644 index 00000000..93d24ff5 --- /dev/null +++ b/modules/pam_filter/upperLOWER/Makefile.am @@ -0,0 +1,15 @@ +# +# Copyright (c) 2005 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ + +securelibfilterdir = $(SECUREDIR)/pam_filter + + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include \ + -I$(srcdir)/.. @PIE_CFLAGS@ +AM_LDFLAGS = @PIE_LDFLAGS@ +LDADD = -L$(top_builddir)/libpam -lpam + +securelibfilter_PROGRAMS = upperLOWER diff --git a/modules/pam_filter/upperLOWER/Makefile.in b/modules/pam_filter/upperLOWER/Makefile.in new file mode 100644 index 00000000..5112980c --- /dev/null +++ b/modules/pam_filter/upperLOWER/Makefile.in @@ -0,0 +1,529 @@ +# Makefile.in generated by automake 1.10.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY, to the extent permitted by law; without +# even the implied warranty of MERCHANTABILITY or FITNESS FOR A +# PARTICULAR PURPOSE. + +@SET_MAKE@ + +# +# Copyright (c) 2005 Thorsten Kukuk <kukuk@suse.de> +# + +VPATH = @srcdir@ +pkgdatadir = $(datadir)/@PACKAGE@ +pkglibdir = $(libdir)/@PACKAGE@ +pkgincludedir = $(includedir)/@PACKAGE@ +am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd +install_sh_DATA = $(install_sh) -c -m 644 +install_sh_PROGRAM = $(install_sh) -c +install_sh_SCRIPT = $(install_sh) -c +INSTALL_HEADER = $(INSTALL_DATA) +transform = $(program_transform_name) +NORMAL_INSTALL = : +PRE_INSTALL = : +POST_INSTALL = : +NORMAL_UNINSTALL = : +PRE_UNINSTALL = : +POST_UNINSTALL = : +build_triplet = @build@ +host_triplet = @host@ +securelibfilter_PROGRAMS = upperLOWER$(EXEEXT) +subdir = modules/pam_filter/upperLOWER +DIST_COMMON = $(srcdir)/Makefile.am $(srcdir)/Makefile.in +ACLOCAL_M4 = $(top_srcdir)/aclocal.m4 +am__aclocal_m4_deps = 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install-man \ + install-pdf install-pdf-am install-ps install-ps-am \ + install-securelibfilterPROGRAMS install-strip installcheck \ + installcheck-am installdirs maintainer-clean \ + maintainer-clean-generic mostlyclean mostlyclean-compile \ + mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \ + tags uninstall uninstall-am uninstall-securelibfilterPROGRAMS + +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_filter/upperLOWER/upperLOWER.c b/modules/pam_filter/upperLOWER/upperLOWER.c new file mode 100644 index 00000000..0ede4a0d --- /dev/null +++ b/modules/pam_filter/upperLOWER/upperLOWER.c @@ -0,0 +1,141 @@ +/* + * This is a sample filter program, for use with pam_filter (a module + * provided with Linux-PAM). This filter simply transposes upper and + * lower case letters, it is intended for demonstration purposes and + * it serves no purpose other than to annoy the user... + */ + +#include "config.h" + +#include <ctype.h> +#include <stdio.h> +#include <stdlib.h> +#include <syslog.h> +#include <sys/time.h> +#include <sys/types.h> +#include <unistd.h> + +#include "pam_filter.h" +#include <security/pam_modutil.h> + +/* ---------------------------------------------------------------- */ + +static void do_transpose(char *buffer,int len) +{ + int i; + for (i=0; i<len; ++i) { + if (islower(buffer[i])) { + buffer[i] = toupper(buffer[i]); + } else { + buffer[i] = tolower(buffer[i]); + } + } +} + +extern char **environ; + +int main(int argc, char **argv UNUSED) +{ + char buffer[BUFSIZ]; + fd_set readers; + void (*before_user)(char *,int); + void (*before_app)(char *,int); + + openlog("upperLOWER", LOG_CONS|LOG_PID, LOG_AUTHPRIV); + +#ifdef DEBUG + { + int i; + + fprintf(stderr,"environment :[\r\n"); + for (i=0; environ[i]; ++i) { + fprintf(stderr,"-> %s\r\n",environ[i]); + } + fprintf(stderr,"]: end\r\n"); + } +#endif + + if (argc != 1) { +#ifdef DEBUG + fprintf(stderr,"filter invoked as conventional executable\n"); +#else + syslog(LOG_ERR, "filter invoked as conventional executable"); +#endif + exit(1); + } + + before_user = before_app = do_transpose; /* assign filter functions */ + + /* enter a loop that deals with the input and output of the + user.. passing it to and from the application */ + + FD_ZERO(&readers); /* initialize reading mask */ + + for (;;) { + + FD_SET(APPOUT_FILENO, &readers); /* wake for output */ + FD_SET(APPERR_FILENO, &readers); /* wake for error */ + FD_SET(STDIN_FILENO, &readers); /* wake for input */ + + if ( select(APPTOP_FILE,&readers,NULL,NULL,NULL) < 0 ) { +#ifdef DEBUG + fprintf(stderr,"select failed\n"); +#else + syslog(LOG_WARNING,"select failed"); +#endif + break; + } + + /* application errors */ + + if ( FD_ISSET(APPERR_FILENO,&readers) ) { + int got = pam_modutil_read(APPERR_FILENO, buffer, BUFSIZ); + if (got <= 0) { + break; + } else { + /* translate to give to real terminal */ + if (before_user != NULL) + before_user(buffer, got); + if (pam_modutil_write(STDERR_FILENO, buffer, got) != got ) { + syslog(LOG_WARNING,"couldn't write %d bytes?!",got); + break; + } + } + } else if ( FD_ISSET(APPOUT_FILENO,&readers) ) { /* app output */ + int got = pam_modutil_read(APPOUT_FILENO, buffer, BUFSIZ); + if (got <= 0) { + break; + } else { + /* translate to give to real terminal */ + if (before_user != NULL) + before_user(buffer, got); + if (pam_modutil_write(STDOUT_FILENO, buffer, got) != got ) { + syslog(LOG_WARNING,"couldn't write %d bytes!?",got); + break; + } + } + } + + if ( FD_ISSET(STDIN_FILENO, &readers) ) { /* user input */ + int got = pam_modutil_read(STDIN_FILENO, buffer, BUFSIZ); + if (got < 0) { + syslog(LOG_WARNING,"user input junked"); + break; + } else if (got) { + /* translate to give to application */ + if (before_app != NULL) + before_app(buffer, got); + if (pam_modutil_write(APPIN_FILENO, buffer, got) != got ) { + syslog(LOG_WARNING,"couldn't pass %d bytes!?",got); + break; + } + } else { + /* nothing received -- an error? */ + syslog(LOG_WARNING,"user input null?"); + break; + } + } + } + + exit(0); +} diff --git a/modules/pam_ftp/Makefile.am b/modules/pam_ftp/Makefile.am new file mode 100644 index 00000000..a4ce03df --- /dev/null +++ b/modules/pam_ftp/Makefile.am @@ -0,0 +1,31 @@ +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README $(MANS) $(XMLS) tst-pam_ftp + +man_MANS = pam_ftp.8 +XMLS = README.xml pam_ftp.8.xml + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_ftp.la 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install-info \ + install-info-am install-man install-man8 install-pdf \ + install-pdf-am install-ps install-ps-am \ + install-securelibLTLIBRARIES install-strip installcheck \ + installcheck-am installdirs maintainer-clean \ + maintainer-clean-generic mostlyclean mostlyclean-compile \ + mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \ + tags uninstall uninstall-am uninstall-man uninstall-man8 \ + uninstall-securelibLTLIBRARIES + +@ENABLE_REGENERATE_MAN_TRUE@README: pam_ftp.8.xml +@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_ftp/README b/modules/pam_ftp/README new file mode 100644 index 00000000..15f4130e --- /dev/null +++ b/modules/pam_ftp/README @@ -0,0 +1,52 @@ +pam_ftp — PAM module for anonymous access module + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +pam_ftp is a PAM module which provides a pluggable anonymous ftp mode of +access. + +This module intercepts the user's name and password. If the name is ftp or +anonymous, the user's password is broken up at the @ delimiter into a PAM_RUSER +and a PAM_RHOST part; these pam-items being set accordingly. The username ( +PAM_USER) is set to ftp. In this case the module succeeds. Alternatively, the +module sets the PAM_AUTHTOK item with the entered password and fails. + +This module is not safe and easily spoofable. + +OPTIONS + +debug + + Print debug information. + +ignore + + Pay no attention to the email address of the user (if supplied). + +ftp=XXX,YYY,... + + Instead of ftp or anonymous, provide anonymous login to the comma separated + list of users: XXX,YYY,.... Should the applicant enter one of these + usernames the returned username is set to the first in the list: XXX. + +EXAMPLES + +Add the following line to /etc/pam.d/ftpd to handle ftp style anonymous login: + +# +# ftpd; add ftp-specifics. These lines enable anonymous ftp over +# standard UN*X access (the listfile entry blocks access to +# users listed in /etc/ftpusers) +# +auth sufficient pam_ftp.so +auth required pam_unix.so use_first_pass +auth required pam_listfile.so \ + onerr=succeed item=user sense=deny file=/etc/ftpusers + + +AUTHOR + +pam_ftp was written by Andrew G. Morgan <morgan@kernel.org>. + diff --git a/modules/pam_ftp/README.xml b/modules/pam_ftp/README.xml new file mode 100644 index 00000000..65de28e3 --- /dev/null +++ b/modules/pam_ftp/README.xml @@ -0,0 +1,41 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_ftp.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_ftp.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_ftp-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_ftp.8.xml" xpointer='xpointer(//refsect1[@id = "pam_ftp-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_ftp.8.xml" xpointer='xpointer(//refsect1[@id = "pam_ftp-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_ftp.8.xml" xpointer='xpointer(//refsect1[@id = "pam_ftp-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_ftp.8.xml" xpointer='xpointer(//refsect1[@id = "pam_ftp-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_ftp/pam_ftp.8 b/modules/pam_ftp/pam_ftp.8 new file mode 100644 index 00000000..45dbca2d --- /dev/null +++ b/modules/pam_ftp/pam_ftp.8 @@ -0,0 +1,105 @@ +.\" Title: pam_ftp +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_FTP" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_ftp - PAM module for anonymous access module +.SH "SYNOPSIS" +.HP 11 +\fBpam_ftp\.so\fR [debug] [ignore] [users=\fIXXX,YYY,\fR...] +.SH "DESCRIPTION" +.PP +pam_ftp is a PAM module which provides a pluggable anonymous ftp mode of access\. +.PP +This module intercepts the user\'s name and password\. If the name is +\fIftp\fR +or +\fIanonymous\fR, the user\'s password is broken up at the +\fI@\fR +delimiter into a +\fIPAM_RUSER\fR +and a +\fIPAM_RHOST\fR +part; these pam\-items being set accordingly\. The username (\fIPAM_USER\fR) is set to +\fIftp\fR\. In this case the module succeeds\. Alternatively, the module sets the +\fIPAM_AUTHTOK\fR +item with the entered password and fails\. +.PP +This module is not safe and easily spoofable\. +.SH "OPTIONS" +.PP +.PP +\fBdebug\fR +.RS 4 +Print debug information\. +.RE +.PP +\fBignore\fR +.RS 4 +Pay no attention to the email address of the user (if supplied)\. +.RE +.PP +\fBftp=\fR\fB\fIXXX,YYY,\.\.\.\fR\fR +.RS 4 +Instead of +\fIftp\fR +or +\fIanonymous\fR, provide anonymous login to the comma separated list of users: +\fB\fIXXX,YYY,\.\.\.\fR\fR\. Should the applicant enter one of these usernames the returned username is set to the first in the list: +\fIXXX\fR\. +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +Only the +\fBauth\fR +service is supported\. +.SH "RETURN VALUES" +.PP +.PP +PAM_SUCCESS +.RS 4 +The authentication was successfull\. +.RE +.PP +PAM_USER_UNKNOWN +.RS 4 +User not known\. +.RE +.SH "EXAMPLES" +.PP +Add the following line to +\fI/etc/pam\.d/ftpd\fR +to handle ftp style anonymous login: +.sp +.RS 4 +.nf +# +# ftpd; add ftp\-specifics\. These lines enable anonymous ftp over +# standard UN*X access (the listfile entry blocks access to +# users listed in /etc/ftpusers) +# +auth sufficient pam_ftp\.so +auth required pam_unix\.so use_first_pass +auth required pam_listfile\.so \e + onerr=succeed item=user sense=deny file=/etc/ftpusers + +.fi +.RE +.sp +.SH "SEE ALSO" +.PP + +\fBpam.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_ftp was written by Andrew G\. Morgan <morgan@kernel\.org>\. diff --git a/modules/pam_ftp/pam_ftp.8.xml b/modules/pam_ftp/pam_ftp.8.xml new file mode 100644 index 00000000..aca21694 --- /dev/null +++ b/modules/pam_ftp/pam_ftp.8.xml @@ -0,0 +1,183 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_ftp"> + + <refmeta> + <refentrytitle>pam_ftp</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_ftp-name"> + <refname>pam_ftp</refname> + <refpurpose>PAM module for anonymous access module</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_ftp-cmdsynopsis"> + <command>pam_ftp.so</command> + <arg choice="opt"> + debug + </arg> + <arg choice="opt"> + ignore + </arg> + <arg choice="opt" rep='repeat'> + users=<replaceable>XXX,YYY,</replaceable> + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_ftp-description"> + + <title>DESCRIPTION</title> + + <para> + pam_ftp is a PAM module which provides a pluggable + anonymous ftp mode of access. + </para> + <para> + This module intercepts the user's name and password. If the name is + <emphasis>ftp</emphasis> or <emphasis>anonymous</emphasis>, the + user's password is broken up at the <emphasis>@</emphasis> delimiter + into a <emphasis>PAM_RUSER</emphasis> and a + <emphasis>PAM_RHOST</emphasis> part; these pam-items being set + accordingly. The username (<emphasis>PAM_USER</emphasis>) is set + to <emphasis>ftp</emphasis>. In this case the module succeeds. + Alternatively, the module sets the <emphasis>PAM_AUTHTOK</emphasis> + item with the entered password and fails. + </para> + <para> + This module is not safe and easily spoofable. + </para> + </refsect1> + + <refsect1 id="pam_ftp-options"> + + <title>OPTIONS</title> + <para> + <variablelist> + + <varlistentry> + <term> + <option>debug</option> + </term> + <listitem> + <para> + Print debug information. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>ignore</option> + </term> + <listitem> + <para> + Pay no attention to the email address of the user + (if supplied). + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>ftp=<replaceable>XXX,YYY,...</replaceable></option> + </term> + <listitem> + <para> + Instead of <emphasis>ftp</emphasis> or + <emphasis>anonymous</emphasis>, provide anonymous login + to the comma separated list of users: + <option><replaceable>XXX,YYY,...</replaceable></option>. + Should the applicant enter + one of these usernames the returned username is set to + the first in the list: <emphasis>XXX</emphasis>. + </para> + </listitem> + </varlistentry> + + </variablelist> + + </para> + </refsect1> + + <refsect1 id="pam_ftp-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + Only the <option>auth</option> service is supported. + </para> + </refsect1> + + <refsect1 id='pam_ftp-return_values'> + <title>RETURN VALUES</title> + <para> + <variablelist> + + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + The authentication was successfull. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_USER_UNKNOWN</term> + <listitem> + <para> + User not known. + </para> + </listitem> + </varlistentry> + + </variablelist> + </para> + </refsect1> + + <refsect1 id='pam_ftp-examples'> + <title>EXAMPLES</title> + <para> + Add the following line to <filename>/etc/pam.d/ftpd</filename> to + handle ftp style anonymous login: + <programlisting> +# +# ftpd; add ftp-specifics. These lines enable anonymous ftp over +# standard UN*X access (the listfile entry blocks access to +# users listed in /etc/ftpusers) +# +auth sufficient pam_ftp.so +auth required pam_unix.so use_first_pass +auth required pam_listfile.so \ + onerr=succeed item=user sense=deny file=/etc/ftpusers + </programlisting> + </para> + </refsect1> + + <refsect1 id='pam_ftp-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_ftp-author'> + <title>AUTHOR</title> + <para> + pam_ftp was written by Andrew G. Morgan <morgan@kernel.org>. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_ftp/pam_ftp.c b/modules/pam_ftp/pam_ftp.c new file mode 100644 index 00000000..1a6fb5e4 --- /dev/null +++ b/modules/pam_ftp/pam_ftp.c @@ -0,0 +1,237 @@ +/* pam_ftp module */ + +/* + * $Id: pam_ftp.c,v 1.12 2008/03/05 20:21:38 t8m Exp $ + * + * Written by Andrew Morgan <morgan@linux.kernel.org> 1996/3/11 + * + */ + +#define PLEASE_ENTER_PASSWORD "Password required for %s." +#define GUEST_LOGIN_PROMPT "Guest login ok, " \ +"send your complete e-mail address as password." + +/* the following is a password that "can't be correct" */ +#define BLOCK_PASSWORD "\177BAD PASSWPRD\177" + +#include "config.h" + +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <syslog.h> +#include <stdarg.h> +#include <string.h> + +/* + * here, we make a definition for the externally accessible function + * in this file (this definition is required for static a module + * but strongly encouraged generally) it is used to instruct the + * modules include file to define the function prototypes. + */ + +#define PAM_SM_AUTH + +#include <security/pam_modules.h> +#include <security/_pam_macros.h> +#include <security/pam_ext.h> + +/* argument parsing */ + +#define PAM_DEBUG_ARG 01 +#define PAM_IGNORE_EMAIL 02 +#define PAM_NO_ANON 04 + +static int +_pam_parse(pam_handle_t *pamh, int argc, const char **argv, const char **users) +{ + int ctrl=0; + + /* step through arguments */ + for (ctrl=0; argc-- > 0; ++argv) { + + /* generic options */ + + if (!strcmp(*argv,"debug")) + ctrl |= PAM_DEBUG_ARG; + else if (!strncmp(*argv,"users=",6)) { + *users = 6 + *argv; + } else if (!strcmp(*argv,"ignore")) { + ctrl |= PAM_IGNORE_EMAIL; + } else { + pam_syslog(pamh, LOG_ERR, "unknown option: %s", *argv); + } + } + + return ctrl; +} + +/* + * check if name is in list or default list. place users name in *_user + * return 1 if listed 0 if not. + */ + +static int lookup(const char *name, const char *list, const char **_user) +{ + int anon = 0; + + *_user = name; /* this is the default */ + if (list && *list) { + const char *l; + char *list_copy, *x; + char *sptr; + + list_copy = x_strdup(list); + x = list_copy; + while (list_copy && (l = strtok_r(x, ",", &sptr))) { + x = NULL; + if (!strcmp(name, l)) { + *_user = list; + anon = 1; + } + } + _pam_overwrite(list_copy); + _pam_drop(list_copy); + } else { +#define MAX_L 2 + static const char *l[MAX_L] = { "ftp", "anonymous" }; + int i; + + for (i=0; i<MAX_L; ++i) { + if (!strcmp(l[i], name)) { + *_user = l[0]; + anon = 1; + break; + } + } + } + + return anon; +} + +/* --- authentication management functions (only) --- */ + +PAM_EXTERN int +pam_sm_authenticate (pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + int retval, anon=0, ctrl; + const char *user; + const char *users = NULL; + + /* + * this module checks if the user name is ftp or annonymous. If + * this is the case, it can set the PAM_RUSER to the entered email + * address and SUCCEEDS, otherwise it FAILS. + */ + + ctrl = _pam_parse(pamh, argc, argv, &users); + + retval = pam_get_user(pamh, &user, NULL); + if (retval != PAM_SUCCESS || user == NULL) { + pam_syslog(pamh, LOG_ERR, "no user specified"); + return PAM_USER_UNKNOWN; + } + + if (!(ctrl & PAM_NO_ANON)) { + anon = lookup(user, users, &user); + } + + if (anon) { + retval = pam_set_item(pamh, PAM_USER, (const void *)user); + if (retval != PAM_SUCCESS || user == NULL) { + pam_syslog(pamh, LOG_ERR, "user resetting failed"); + return PAM_USER_UNKNOWN; + } + } + + /* + * OK. we require an email address for user or the user's password. + * - build conversation and get their input. + */ + + { + char *resp = NULL; + const char *token; + + if (!anon) + retval = pam_prompt (pamh, PAM_PROMPT_ECHO_OFF, &resp, + PLEASE_ENTER_PASSWORD, user); + else + retval = pam_prompt (pamh, PAM_PROMPT_ECHO_OFF, &resp, + GUEST_LOGIN_PROMPT); + + if (retval != PAM_SUCCESS) { + _pam_overwrite (resp); + _pam_drop (resp); + return ((retval == PAM_CONV_AGAIN) + ? PAM_INCOMPLETE:PAM_AUTHINFO_UNAVAIL); + } + + if (anon) { + /* XXX: Some effort should be made to verify this email address! */ + + if (!(ctrl & PAM_IGNORE_EMAIL)) { + char *sptr; + token = strtok_r(resp, "@", &sptr); + retval = pam_set_item(pamh, PAM_RUSER, token); + + if ((token) && (retval == PAM_SUCCESS)) { + token = strtok_r(NULL, "@", &sptr); + retval = pam_set_item(pamh, PAM_RHOST, token); + } + } + + /* we are happy to grant annonymous access to the user */ + retval = PAM_SUCCESS; + + } else { + /* + * we have a password so set AUTHTOK + */ + + pam_set_item(pamh, PAM_AUTHTOK, resp); + + /* + * this module failed, but the next one might succeed with + * this password. + */ + + retval = PAM_AUTH_ERR; + } + + /* clean up */ + _pam_overwrite(resp); + _pam_drop(resp); + + /* success or failure */ + + return retval; + } +} + +PAM_EXTERN int +pam_sm_setcred (pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_IGNORE; +} + + +#ifdef PAM_STATIC + +/* static module data */ + +struct pam_module _pam_ftp_modstruct = { + "pam_ftp", + pam_sm_authenticate, + pam_sm_setcred, + NULL, + NULL, + NULL, + NULL, +}; + +#endif + +/* end of module definition */ diff --git a/modules/pam_ftp/tst-pam_ftp b/modules/pam_ftp/tst-pam_ftp new file mode 100755 index 00000000..1a4f67c7 --- /dev/null +++ b/modules/pam_ftp/tst-pam_ftp @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_ftp.so diff --git a/modules/pam_group/Makefile.am b/modules/pam_group/Makefile.am new file mode 100644 index 00000000..22dc831b --- /dev/null +++ b/modules/pam_group/Makefile.am @@ -0,0 +1,34 @@ +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README group.conf $(MANS) $(XMLS) tst-pam_group + +man_MANS = group.conf.5 pam_group.8 +XMLS = README.xml group.conf.5.xml pam_group.8.xml + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include 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install-man8 \ + install-pdf install-pdf-am install-ps install-ps-am \ + install-secureconfDATA install-securelibLTLIBRARIES \ + install-strip installcheck installcheck-am installdirs \ + maintainer-clean maintainer-clean-generic mostlyclean \ + mostlyclean-compile mostlyclean-generic mostlyclean-libtool \ + pdf pdf-am ps ps-am tags uninstall uninstall-am uninstall-man \ + uninstall-man5 uninstall-man8 uninstall-secureconfDATA \ + uninstall-securelibLTLIBRARIES + +@ENABLE_REGENERATE_MAN_TRUE@README: pam_group.8.xml group.conf.5.xml +@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_group/README b/modules/pam_group/README new file mode 100644 index 00000000..2e1e37a5 --- /dev/null +++ b/modules/pam_group/README @@ -0,0 +1,45 @@ +pam_group — PAM module for group access + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +The pam_group PAM module does not authenticate the user, but instead it grants +group memberships (in the credential setting phase of the authentication +module) to the user. Such memberships are based on the service they are +applying for. + +By default rules for group memberships are taken from config file /etc/security +/group.conf. + +This module's usefulness relies on the file-systems accessible to the user. The +point being that once granted the membership of a group, the user may attempt +to create a setgid binary with a restricted group ownership. Later, when the +user is not given membership to this group, they can recover group membership +with the precompiled binary. The reason that the file-systems that the user has +access to are so significant, is the fact that when a system is mounted nosuid +the user is unable to create or execute such a binary file. For this module to +provide any level of security, all file-systems that the user has write access +to should be mounted nosuid. + +The pam_group module fuctions in parallel with the /etc/group file. If the user +is granted any groups based on the behavior of this module, they are granted in +addition to those entries /etc/group (or equivalent). + +EXAMPLES + +These are some example lines which might be specified in /etc/security/ +group.conf. + +Running 'xsh' on tty* (any ttyXXX device), the user 'us' is given access to the +floppy (through membership of the floppy group) + +xsh;tty*&!ttyp*;us;Al0000-2400;floppy + +Running 'xsh' on tty* (any ttyXXX device), the user 'sword' is given access to +games (through membership of the floppy group) after work hours. + +xsh; tty* ;sword;!Wk0900-1800;games, sound +xsh; tty* ;*;Al0900-1800;floppy + + diff --git a/modules/pam_group/README.xml b/modules/pam_group/README.xml new file mode 100644 index 00000000..387d6987 --- /dev/null +++ b/modules/pam_group/README.xml @@ -0,0 +1,34 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamgroup SYSTEM "pam_group.8.xml"> +--> +<!-- +<!ENTITY groupconf SYSTEM "group.conf.5.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_group.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_group-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_group.8.xml" xpointer='xpointer(//refsect1[@id = "pam_group-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="group.conf.5.xml" xpointer='xpointer(//refsect1[@id = "group.conf-examples"]/*)'/> + </section> + +</article> diff --git a/modules/pam_group/group.conf b/modules/pam_group/group.conf new file mode 100644 index 00000000..b766becb --- /dev/null +++ b/modules/pam_group/group.conf @@ -0,0 +1,99 @@ +# +# This is the configuration file for the pam_group module. +# + +# +# *** Please note that giving group membership on a session basis is +# *** NOT inherently secure. If a user can create an executable that +# *** is setgid a group that they are infrequently given membership +# *** of, they can basically obtain group membership any time they +# *** like. Example: games are allowed between the hours of 6pm and 6am +# *** user joe logs in at 7pm writes a small C-program toplay.c that +# *** invokes their favorite shell, compiles it and does +# *** "chgrp play toplay; chmod g+s toplay". They are basically able +# *** to play games any time... You have been warned. AGM +# + +# +# The syntax of the lines is as follows: +# +# services;ttys;users;times;groups +# +# white space is ignored and lines maybe extended with '\\n' (escaped +# newlines). From reading these comments, it is clear that +# text following a '#' is ignored to the end of the line. +# +# the combination of individual users/terminals etc is a logic list +# namely individual tokens that are optionally prefixed with '!' (logical +# not) and separated with '&' (logical and) and '|' (logical or). +# +# services +# is a logic list of PAM service names that the rule applies to. +# +# ttys +# is a logic list of terminal names that this rule applies to. +# +# users +# is a logic list of users or a netgroup of users to whom this +# rule applies. +# +# NB. For these items the simple wildcard '*' may be used only once. +# With netgroups no wildcards or logic operators are allowed. +# +# times +# It is used to indicate "when" these groups are to be given to the +# user. The format here is a logic list of day/time-range +# entries the days are specified by a sequence of two character +# entries, MoTuSa for example is Monday Tuesday and Saturday. Note +# that repeated days are unset MoMo = no day, and MoWk = all weekdays +# bar Monday. The two character combinations accepted are +# +# Mo Tu We Th Fr Sa Su Wk Wd Al +# +# the last two being week-end days and all 7 days of the week +# respectively. As a final example, AlFr means all days except Friday. +# +# Each day/time-range can be prefixed with a '!' to indicate "anything +# but" +# +# The time-range part is two 24-hour times HHMM separated by a hyphen +# indicating the start and finish time (if the finish time is smaller +# than the start time it is deemed to apply on the following day). +# +# groups +# The (comma or space separated) list of groups that the user +# inherits membership of. These groups are added if the previous +# fields are satisfied by the user's request +# +# For a rule to be active, ALL of service+ttys+users must be satisfied +# by the applying process. +# + +# +# Note, to get this to work as it is currently typed you need +# +# 1. to run an application as root +# 2. add the following groups to the /etc/group file: +# floppy, play, sound +# + +# +# Here is a simple example: running 'xsh' on tty* (any ttyXXX device), +# the user 'us' is given access to the floppy (through membership of +# the floppy group) +# + +#xsh;tty*&!ttyp*;us;Al0000-2400;floppy + +# +# another example: running 'xsh' on tty* (any ttyXXX device), +# the user 'sword' is given access to games (through membership of +# the sound and play group) after work hours. +# + +#xsh; tty* ;sword;!Wk0900-1800;sound, play +#xsh; tty* ;*;Al0900-1800;floppy + +# +# End of group.conf file +# diff --git a/modules/pam_group/group.conf.5 b/modules/pam_group/group.conf.5 new file mode 100644 index 00000000..7f0f2268 --- /dev/null +++ b/modules/pam_group/group.conf.5 @@ -0,0 +1,83 @@ +.\" Title: group.conf +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "GROUP\.CONF" "5" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +group.conf - configuration file for the pam_group module +.SH "DESCRIPTION" +.PP +The pam_group PAM module does not authenticate the user, but instead it grants group memberships (in the credential setting phase of the authentication module) to the user\. Such memberships are based on the service they are applying for\. +.PP +For this module to function correctly there must be a correctly formatted +\fI/etc/security/group\.conf\fR +file present\. White spaces are ignored and lines maybe extended with \'\e\' (escaped newlines)\. Text following a \'#\' is ignored to the end of the line\. +.PP +The syntax of the lines is as follows: +.PP + +\fIservices\fR;\fIttys\fR;\fIusers\fR;\fItimes\fR;\fIgroups\fR +.PP +The first field, the +\fIservices\fR +field, is a logic list of PAM service names that the rule applies to\. +.PP +The second field, the +\fItty\fR +field, is a logic list of terminal names that this rule applies to\. +.PP +The third field, the +\fIusers\fR +field, is a logic list of users or a netgroup of users to whom this rule applies\. +.PP +For these items the simple wildcard \'*\' may be used only once\. With netgroups no wildcards or logic operators are allowed\. +.PP +The +\fItimes\fR +field is used to indicate "when" these groups are to be given to the user\. The format here is a logic list of day/time\-range entries\. The days are specified by a sequence of two character entries, MoTuSa for example is Monday Tuesday and Saturday\. Note that repeated days are unset MoMo = no day, and MoWk = all weekdays bar Monday\. The two character combinations accepted are Mo Tu We Th Fr Sa Su Wk Wd Al, the last two being week\-end days and all 7 days of the week respectively\. As a final example, AlFr means all days except Friday\. +.PP +Each day/time\-range can be prefixed with a \'!\' to indicate "anything but"\. The time\-range part is two 24\-hour times HHMM, separated by a hyphen, indicating the start and finish time (if the finish time is smaller than the start time it is deemed to apply on the following day)\. +.PP +The +\fIgroups\fR +field is a comma or space separated list of groups that the user inherits membership of\. These groups are added if the previous fields are satisfied by the user\'s request\. +.PP +For a rule to be active, ALL of service+ttys+users must be satisfied by the applying process\. +.SH "EXAMPLES" +.PP +These are some example lines which might be specified in +\fI/etc/security/group\.conf\fR\. +.PP +Running \'xsh\' on tty* (any ttyXXX device), the user \'us\' is given access to the floppy (through membership of the floppy group) +.sp +.RS 4 +.nf +xsh;tty*&!ttyp*;us;Al0000\-2400;floppy +.fi +.RE +.PP +Running \'xsh\' on tty* (any ttyXXX device), the user \'sword\' is given access to games (through membership of the floppy group) after work hours\. +.sp +.RS 4 +.nf +xsh; tty* ;sword;!Wk0900\-1800;games, sound +xsh; tty* ;*;Al0900\-1800;floppy + +.fi +.RE +.SH "SEE ALSO" +.PP + +\fBpam_group\fR(8), +\fBpam.d\fR(5), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_group was written by Andrew G\. Morgan <morgan@kernel\.org>\. diff --git a/modules/pam_group/group.conf.5.xml b/modules/pam_group/group.conf.5.xml new file mode 100644 index 00000000..9c008eb0 --- /dev/null +++ b/modules/pam_group/group.conf.5.xml @@ -0,0 +1,131 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="group.conf"> + + <refmeta> + <refentrytitle>group.conf</refentrytitle> + <manvolnum>5</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv> + <refname>group.conf</refname> + <refpurpose>configuration file for the pam_group module</refpurpose> + </refnamediv> + + <refsect1 id='group.conf-description'> + <title>DESCRIPTION</title> + + <para> + The pam_group PAM module does not authenticate the user, but instead + it grants group memberships (in the credential setting phase of the + authentication module) to the user. Such memberships are based on the + service they are applying for. + </para> + <para> + For this module to function correctly there must be a correctly + formatted <filename>/etc/security/group.conf</filename> file present. + White spaces are ignored and lines maybe extended with '\' (escaped + newlines). Text following a '#' is ignored to the end of the line. + </para> + + <para> + The syntax of the lines is as follows: + </para> + + <para> + <replaceable>services</replaceable>;<replaceable>ttys</replaceable>;<replaceable>users</replaceable>;<replaceable>times</replaceable>;<replaceable>groups</replaceable> + </para> + + + <para> + The first field, the <replaceable>services</replaceable> field, is a logic list + of PAM service names that the rule applies to. + </para> + + <para> + The second field, the <replaceable>tty</replaceable> + field, is a logic list of terminal names that this rule applies to. + </para> + + <para> + The third field, the <replaceable>users</replaceable> + field, is a logic list of users or a netgroup of users to whom this + rule applies. + </para> + + <para> + For these items the simple wildcard '*' may be used only once. + With netgroups no wildcards or logic operators are allowed. + </para> + + <para> + The <replaceable>times</replaceable> field is used to indicate "when" + these groups are to be given to the user. The format here is a logic + list of day/time-range entries. The days are specified by a sequence of + two character entries, MoTuSa for example is Monday Tuesday and Saturday. + Note that repeated days are unset MoMo = no day, and MoWk = all weekdays + bar Monday. The two character combinations accepted are Mo Tu We Th Fr Sa + Su Wk Wd Al, the last two being week-end days and all 7 days of the week + respectively. As a final example, AlFr means all days except Friday. + </para> + <para> + Each day/time-range can be prefixed with a '!' to indicate "anything but". + The time-range part is two 24-hour times HHMM, separated by a hyphen, + indicating the start and finish time (if the finish time is smaller + than the start time it is deemed to apply on the following day). + </para> + + <para> + The <replaceable>groups</replaceable> field is a comma or space + separated list of groups that the user inherits membership of. These + groups are added if the previous fields are satisfied by the user's request. + </para> + + <para> + For a rule to be active, ALL of service+ttys+users must be satisfied + by the applying process. + </para> + </refsect1> + + <refsect1 id="group.conf-examples"> + <title>EXAMPLES</title> + <para> + These are some example lines which might be specified in + <filename>/etc/security/group.conf</filename>. + </para> + + <para> + Running 'xsh' on tty* (any ttyXXX device), the user 'us' is given access + to the floppy (through membership of the floppy group) + </para> + <programlisting>xsh;tty*&!ttyp*;us;Al0000-2400;floppy</programlisting> + + <para> + Running 'xsh' on tty* (any ttyXXX device), the user 'sword' is given access + to games (through membership of the floppy group) after work hours. + </para> + <programlisting> +xsh; tty* ;sword;!Wk0900-1800;games, sound +xsh; tty* ;*;Al0900-1800;floppy + </programlisting> + </refsect1> + + <refsect1 id="group.conf-see_also"> + <title>SEE ALSO</title> + <para> + <citerefentry><refentrytitle>pam_group</refentrytitle><manvolnum>8</manvolnum></citerefentry>, + <citerefentry><refentrytitle>pam.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum></citerefentry> + </para> + </refsect1> + + <refsect1 id="group.conf-author"> + <title>AUTHOR</title> + <para> + pam_group was written by Andrew G. Morgan <morgan@kernel.org>. + </para> + </refsect1> +</refentry> diff --git a/modules/pam_group/pam_group.8 b/modules/pam_group/pam_group.8 new file mode 100644 index 00000000..fabd4a5f --- /dev/null +++ b/modules/pam_group/pam_group.8 @@ -0,0 +1,94 @@ +.\" Title: pam_group +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_GROUP" "8" "04/16/2008" "Linux-PAM Manual" "Linux-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_group - PAM module for group access +.SH "SYNOPSIS" +.HP 13 +\fBpam_group\.so\fR +.SH "DESCRIPTION" +.PP +The pam_group PAM module does not authenticate the user, but instead it grants group memberships (in the credential setting phase of the authentication module) to the user\. Such memberships are based on the service they are applying for\. +.PP +By default rules for group memberships are taken from config file +\fI/etc/security/group\.conf\fR\. +.PP +This module\'s usefulness relies on the file\-systems accessible to the user\. The point being that once granted the membership of a group, the user may attempt to create a +\fBsetgid\fR +binary with a restricted group ownership\. Later, when the user is not given membership to this group, they can recover group membership with the precompiled binary\. The reason that the file\-systems that the user has access to are so significant, is the fact that when a system is mounted +\fInosuid\fR +the user is unable to create or execute such a binary file\. For this module to provide any level of security, all file\-systems that the user has write access to should be mounted +\fInosuid\fR\. +.PP +The pam_group module fuctions in parallel with the +\fI/etc/group\fR +file\. If the user is granted any groups based on the behavior of this module, they are granted +\fIin addition\fR +to those entries +\fI/etc/group\fR +(or equivalent)\. +.SH "OPTIONS" +.PP +This module does not recognise any options\. +.SH "MODULE SERVICES PROVIDED" +.PP +Only the +\fBauth\fR +service is supported\. +.SH "RETURN VALUES" +.PP +PAM_SUCCESS +.RS 4 +group membership was granted\. +.RE +.PP +PAM_ABORT +.RS 4 +Not all relevant data could be gotten\. +.RE +.PP +PAM_BUF_ERR +.RS 4 +Memory buffer error\. +.RE +.PP +PAM_CRED_ERR +.RS 4 +Group membership was not granted\. +.RE +.PP +PAM_IGNORE +.RS 4 + +\fBpam_sm_authenticate\fR +was called which does nothing\. +.RE +.PP +PAM_USER_UNKNOWN +.RS 4 +The user is not known to the system\. +.RE +.SH "FILES" +.PP +\fI/etc/security/group\.conf\fR +.RS 4 +Default configuration file +.RE +.SH "SEE ALSO" +.PP + +\fBgroup.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8)\. +.SH "AUTHORS" +.PP +pam_group was written by Andrew G\. Morgan <morgan@kernel\.org>\. diff --git a/modules/pam_group/pam_group.8.xml b/modules/pam_group/pam_group.8.xml new file mode 100644 index 00000000..f7488fb3 --- /dev/null +++ b/modules/pam_group/pam_group.8.xml @@ -0,0 +1,162 @@ +<?xml version="1.0" encoding="ISO-8859-1"?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN" + "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd"> + +<refentry id='pam_group'> + + <refmeta> + <refentrytitle>pam_group</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class='setdesc'>Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id='pam_group-name'> + <refname>pam_group</refname> + <refpurpose> + PAM module for group access + </refpurpose> + </refnamediv> + +<!-- body begins here --> + + <refsynopsisdiv> + <cmdsynopsis id="pam_group-cmdsynopsis"> + <command>pam_group.so</command> + </cmdsynopsis> + </refsynopsisdiv> + + + <refsect1 id="pam_group-description"> + <title>DESCRIPTION</title> + <para> + The pam_group PAM module does not authenticate the user, but instead + it grants group memberships (in the credential setting phase of the + authentication module) to the user. Such memberships are based on the + service they are applying for. + </para> + <para> + By default rules for group memberships are taken from config file + <filename>/etc/security/group.conf</filename>. + </para> + <para> + This module's usefulness relies on the file-systems + accessible to the user. The point being that once granted the + membership of a group, the user may attempt to create a + <function>setgid</function> binary with a restricted group ownership. + Later, when the user is not given membership to this group, they can + recover group membership with the precompiled binary. The reason that + the file-systems that the user has access to are so significant, is the + fact that when a system is mounted <emphasis>nosuid</emphasis> the user + is unable to create or execute such a binary file. For this module to + provide any level of security, all file-systems that the user has write + access to should be mounted <emphasis>nosuid</emphasis>. + </para> + <para> + The pam_group module fuctions in parallel with the + <filename>/etc/group</filename> file. If the user is granted any groups + based on the behavior of this module, they are granted + <emphasis>in addition</emphasis> to those entries + <filename>/etc/group</filename> (or equivalent). + </para> + </refsect1> + + <refsect1 id="pam_group-options"> + <title>OPTIONS</title> + <para>This module does not recognise any options.</para> + </refsect1> + + <refsect1 id="pam_group-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + Only the <option>auth</option> service is supported. + </para> + </refsect1> + + <refsect1 id="pam_group-return_values"> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + group membership was granted. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_ABORT</term> + <listitem> + <para> + Not all relevant data could be gotten. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_BUF_ERR</term> + <listitem> + <para> + Memory buffer error. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_CRED_ERR</term> + <listitem> + <para> + Group membership was not granted. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_IGNORE</term> + <listitem> + <para> + <function>pam_sm_authenticate</function> was called which does nothing. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_USER_UNKNOWN</term> + <listitem> + <para> + The user is not known to the system. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_group-files"> + <title>FILES</title> + <variablelist> + <varlistentry> + <term><filename>/etc/security/group.conf</filename></term> + <listitem> + <para>Default configuration file</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_group-see_also"> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>group.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>. + </para> + </refsect1> + + <refsect1 id="pam_group-authors"> + <title>AUTHORS</title> + <para> + pam_group was written by Andrew G. Morgan <morgan@kernel.org>. + </para> + </refsect1> +</refentry> diff --git a/modules/pam_group/pam_group.c b/modules/pam_group/pam_group.c new file mode 100644 index 00000000..4a54da14 --- /dev/null +++ b/modules/pam_group/pam_group.c @@ -0,0 +1,842 @@ +/* pam_group module */ + +/* + * Written by Andrew Morgan <morgan@linux.kernel.org> 1996/7/6 + */ + +#include "config.h" + +#include <sys/file.h> +#include <stdio.h> +#include <stdlib.h> +#include <ctype.h> +#include <unistd.h> +#include <stdarg.h> +#include <time.h> +#include <syslog.h> +#include <string.h> + +#include <grp.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <netdb.h> + +#define PAM_GROUP_BUFLEN 1000 +#define FIELD_SEPARATOR ';' /* this is new as of .02 */ + +#ifndef TRUE +# define TRUE 1 +#endif +#ifndef FALSE +# define FALSE 0 +#endif + +typedef enum { AND, OR } operator; + +/* + * here, we make definitions for the externally accessible functions + * in this file (these definitions are required for static modules + * but strongly encouraged generally) they are used to instruct the + * modules include file to define their prototypes. + */ + +#define PAM_SM_AUTH + +#include <security/pam_modules.h> +#include <security/_pam_macros.h> +#include <security/pam_modutil.h> +#include <security/pam_ext.h> + +/* --- static functions for checking whether the user should be let in --- */ + +static void shift_bytes(char *mem, int from, int by) +{ + while (by-- > 0) { + *mem = mem[from]; + ++mem; + } +} + +/* This function should initially be called with buf = NULL. If + * an error occurs, the file descriptor is closed. Subsequent + * calls with a closed descriptor will cause buf to be deallocated. + * Therefore, always check buf after calling this to see if an error + * occurred. + */ +static int +read_field (const pam_handle_t *pamh, int fd, char **buf, int *from, int *to) +{ + /* is buf set ? */ + + if (! *buf) { + *buf = (char *) malloc(PAM_GROUP_BUFLEN); + if (! *buf) { + pam_syslog(pamh, LOG_ERR, "out of memory"); + return -1; + } + *from = *to = 0; + fd = open(PAM_GROUP_CONF, O_RDONLY); + } + + /* do we have a file open ? return error */ + + if (fd < 0 && *to <= 0) { + pam_syslog(pamh, LOG_ERR, "%s not opened", PAM_GROUP_CONF); + memset(*buf, 0, PAM_GROUP_BUFLEN); + _pam_drop(*buf); + return -1; + } + + /* check if there was a newline last time */ + + if ((*to > *from) && (*to > 0) + && ((*buf)[*from] == '\0')) { /* previous line ended */ + (*from)++; + (*buf)[0] = '\0'; + return fd; + } + + /* ready for more data: first shift the buffer's remaining data */ + + *to -= *from; + shift_bytes(*buf, *from, *to); + *from = 0; + (*buf)[*to] = '\0'; + + while (fd >= 0 && *to < PAM_GROUP_BUFLEN) { + int i; + + /* now try to fill the remainder of the buffer */ + + i = read(fd, *to + *buf, PAM_GROUP_BUFLEN - *to); + if (i < 0) { + pam_syslog(pamh, LOG_ERR, "error reading %s: %m", PAM_GROUP_CONF); + close(fd); + return -1; + } else if (!i) { + close(fd); + fd = -1; /* end of file reached */ + } else + *to += i; + + /* + * contract the buffer. Delete any comments, and replace all + * multiple spaces with single commas + */ + + i = 0; +#ifdef DEBUG_DUMP + D(("buffer=<%s>",*buf)); +#endif + while (i < *to) { + if ((*buf)[i] == ',') { + int j; + + for (j=++i; j<*to && (*buf)[j] == ','; ++j); + if (j!=i) { + shift_bytes(i + (*buf), j-i, (*to) - j); + *to -= j-i; + } + } + switch ((*buf)[i]) { + int j, c; + case '#': + c = 0; + for (j=i; j < *to && (c = (*buf)[j]) != '\n'; ++j); + if (j >= *to) { + (*buf)[*to = ++i] = '\0'; + } else if (c == '\n') { + shift_bytes(i + (*buf), j-i, (*to) - j); + *to -= j-i; + ++i; + } else { + pam_syslog(pamh, LOG_CRIT, + "internal error in file %s at line %d", + __FILE__, __LINE__); + close(fd); + return -1; + } + break; + case '\\': + if ((*buf)[i+1] == '\n') { + shift_bytes(i + *buf, 2, *to - (i+2)); + *to -= 2; + } else { + ++i; /* we don't escape non-newline characters */ + } + break; + case '!': + case ' ': + case '\t': + if ((*buf)[i] != '!') + (*buf)[i] = ','; + /* delete any trailing spaces */ + for (j=++i; j < *to && ( (c = (*buf)[j]) == ' ' + || c == '\t' ); ++j); + shift_bytes(i + *buf, j-i, (*to)-j ); + *to -= j-i; + break; + default: + ++i; + } + } + } + + (*buf)[*to] = '\0'; + + /* now return the next field (set the from/to markers) */ + { + int i; + + for (i=0; i<*to; ++i) { + switch ((*buf)[i]) { + case '#': + case '\n': /* end of the line/file */ + (*buf)[i] = '\0'; + *from = i; + return fd; + case FIELD_SEPARATOR: /* end of the field */ + (*buf)[i] = '\0'; + *from = ++i; + return fd; + } + } + *from = i; + (*buf)[*from] = '\0'; + } + + if (*to <= 0) { + D(("[end of text]")); + *buf = NULL; + } + return fd; +} + +/* read a member from a field */ + +static int logic_member(const char *string, int *at) +{ + int c,to; + int done=0; + int token=0; + + to=*at; + do { + c = string[to++]; + + switch (c) { + + case '\0': + --to; + done = 1; + break; + + case '&': + case '|': + case '!': + if (token) { + --to; + } + done = 1; + break; + + default: + if (isalpha(c) || c == '*' || isdigit(c) || c == '_' + || c == '-' || c == '.' || c == '/' || c == ':') { + token = 1; + } else if (token) { + --to; + done = 1; + } else { + ++*at; + } + } + } while (!done); + + return to - *at; +} + +typedef enum { VAL, OP } expect; + +static int +logic_field (const pam_handle_t *pamh, const void *me, + const char *x, int rule, + int (*agrees)(const pam_handle_t *pamh, const void *, + const char *, int, int)) +{ + int left=FALSE, right, not=FALSE; + operator oper=OR; + int at=0, l; + expect next=VAL; + + while ((l = logic_member(x,&at))) { + int c = x[at]; + + if (next == VAL) { + if (c == '!') + not = !not; + else if (isalpha(c) || c == '*' || isdigit(c) || c == '_' + || c == '-' || c == '.' || c == '/' || c == ':') { + right = not ^ agrees(pamh, me, x+at, l, rule); + if (oper == AND) + left &= right; + else + left |= right; + next = OP; + } else { + pam_syslog(pamh, LOG_ERR, + "garbled syntax; expected name (rule #%d)", + rule); + return FALSE; + } + } else { /* OP */ + switch (c) { + case '&': + oper = AND; + break; + case '|': + oper = OR; + break; + default: + pam_syslog(pamh, LOG_ERR, + "garbled syntax; expected & or | (rule #%d)", + rule); + D(("%c at %d",c,at)); + return FALSE; + } + next = VAL; + } + at += l; + } + + return left; +} + +static int +is_same (const pam_handle_t *pamh UNUSED, + const void *A, const char *b, int len, int rule UNUSED) +{ + int i; + const char *a; + + a = A; + for (i=0; len > 0; ++i, --len) { + if (b[i] != a[i]) { + if (b[i++] == '*') { + return (!--len || !strncmp(b+i,a+strlen(a)-len,len)); + } else + return FALSE; + } + } + + /* Ok, we know that b is a substring from A and does not contain + wildcards, but now the length of both strings must be the same, + too. */ + if (strlen (a) != strlen(b)) + return FALSE; + + return ( !len ); +} + +typedef struct { + int day; /* array of 7 bits, one set for today */ + int minute; /* integer, hour*100+minute for now */ +} TIME; + +static struct day { + const char *d; + int bit; +} const days[11] = { + { "su", 01 }, + { "mo", 02 }, + { "tu", 04 }, + { "we", 010 }, + { "th", 020 }, + { "fr", 040 }, + { "sa", 0100 }, + { "wk", 076 }, + { "wd", 0101 }, + { "al", 0177 }, + { NULL, 0 } +}; + +static TIME time_now(void) +{ + struct tm *local; + time_t the_time; + TIME this; + + the_time = time((time_t *)0); /* get the current time */ + local = localtime(&the_time); + this.day = days[local->tm_wday].bit; + this.minute = local->tm_hour*100 + local->tm_min; + + D(("day: 0%o, time: %.4d", this.day, this.minute)); + return this; +} + +/* take the current date and see if the range "date" passes it */ +static int +check_time (const pam_handle_t *pamh, const void *AT, + const char *times, int len, int rule) +{ + int not,pass; + int marked_day, time_start, time_end; + const TIME *at; + int i,j=0; + + at = AT; + D(("checking: 0%o/%.4d vs. %s", at->day, at->minute, times)); + + if (times == NULL) { + /* this should not happen */ + pam_syslog(pamh, LOG_CRIT, "internal error in file %s at line %d", + __FILE__, __LINE__); + return FALSE; + } + + if (times[j] == '!') { + ++j; + not = TRUE; + } else { + not = FALSE; + } + + for (marked_day = 0; len > 0 && isalpha(times[j]); --len) { + int this_day=-1; + + D(("%c%c ?", times[j], times[j+1])); + for (i=0; days[i].d != NULL; ++i) { + if (tolower(times[j]) == days[i].d[0] + && tolower(times[j+1]) == days[i].d[1] ) { + this_day = days[i].bit; + break; + } + } + j += 2; + if (this_day == -1) { + pam_syslog(pamh, LOG_ERR, "bad day specified (rule #%d)", rule); + return FALSE; + } + marked_day ^= this_day; + } + if (marked_day == 0) { + pam_syslog(pamh, LOG_ERR, "no day specified"); + return FALSE; + } + D(("day range = 0%o", marked_day)); + + time_start = 0; + for (i=0; len > 0 && i < 4 && isdigit(times[i+j]); ++i, --len) { + time_start *= 10; + time_start += times[i+j]-'0'; /* is this portable? */ + } + j += i; + + if (times[j] == '-') { + time_end = 0; + for (i=1; len > 0 && i < 5 && isdigit(times[i+j]); ++i, --len) { + time_end *= 10; + time_end += times[i+j]-'0'; /* is this portable? */ + } + j += i; + } else + time_end = -1; + + D(("i=%d, time_end=%d, times[j]='%c'", i, time_end, times[j])); + if (i != 5 || time_end == -1) { + pam_syslog(pamh, LOG_ERR, "no/bad times specified (rule #%d)", rule); + return TRUE; + } + D(("times(%d to %d)", time_start,time_end)); + D(("marked_day = 0%o", marked_day)); + + /* compare with the actual time now */ + + pass = FALSE; + if (time_start < time_end) { /* start < end ? --> same day */ + if ((at->day & marked_day) && (at->minute >= time_start) + && (at->minute < time_end)) { + D(("time is listed")); + pass = TRUE; + } + } else { /* spans two days */ + if ((at->day & marked_day) && (at->minute >= time_start)) { + D(("caught on first day")); + pass = TRUE; + } else { + marked_day <<= 1; + marked_day |= (marked_day & 0200) ? 1:0; + D(("next day = 0%o", marked_day)); + if ((at->day & marked_day) && (at->minute <= time_end)) { + D(("caught on second day")); + pass = TRUE; + } + } + } + + return (not ^ pass); +} + +static int find_member(const char *string, int *at) +{ + int c,to; + int done=0; + int token=0; + + to=*at; + do { + c = string[to++]; + + switch (c) { + + case '\0': + --to; + done = 1; + break; + + case '&': + case '|': + case '!': + if (token) { + --to; + } + done = 1; + break; + + default: + if (isalpha(c) || isdigit(c) || c == '_' || c == '*' + || c == '-') { + token = 1; + } else if (token) { + --to; + done = 1; + } else { + ++*at; + } + } + } while (!done); + + return to - *at; +} + +#define GROUP_BLK 10 +#define blk_size(len) (((len-1 + GROUP_BLK)/GROUP_BLK)*GROUP_BLK) + +static int mkgrplist(pam_handle_t *pamh, char *buf, gid_t **list, int len) +{ + int l,at=0; + int blks; + + blks = blk_size(len); + D(("cf. blks=%d and len=%d", blks,len)); + + while ((l = find_member(buf,&at))) { + int edge; + + if (len >= blks) { + gid_t *tmp; + + D(("allocating new block")); + tmp = (gid_t *) realloc((*list) + , sizeof(gid_t) * (blks += GROUP_BLK)); + if (tmp != NULL) { + (*list) = tmp; + } else { + pam_syslog(pamh, LOG_ERR, "out of memory for group list"); + free(*list); + (*list) = NULL; + return -1; + } + } + + /* '\0' terminate the entry */ + + edge = (buf[at+l]) ? 1:0; + buf[at+l] = '\0'; + D(("found group: %s",buf+at)); + + /* this is where we convert a group name to a gid_t */ + { + const struct group *grp; + + grp = pam_modutil_getgrnam(pamh, buf+at); + if (grp == NULL) { + pam_syslog(pamh, LOG_ERR, "bad group: %s", buf+at); + } else { + D(("group %s exists", buf+at)); + (*list)[len++] = grp->gr_gid; + } + } + + /* next entry along */ + + at += l + edge; + } + D(("returning with [%p/len=%d]->%p",list,len,*list)); + return len; +} + + +static int check_account(pam_handle_t *pamh, const char *service, + const char *tty, const char *user) +{ + int from=0,to=0,fd=-1; + char *buffer=NULL; + int count=0; + TIME here_and_now; + int retval=PAM_SUCCESS; + gid_t *grps; + int no_grps; + + /* + * first we get the current list of groups - the application + * will have previously done an initgroups(), or equivalent. + */ + + D(("counting supplementary groups")); + no_grps = getgroups(0, NULL); /* find the current number of groups */ + if (no_grps > 0) { + grps = calloc( blk_size(no_grps) , sizeof(gid_t) ); + D(("copying current list into grps [%d big]",blk_size(no_grps))); + if (getgroups(no_grps, grps) < 0) { + D(("getgroups call failed")); + no_grps = 0; + grps = NULL; + } +#ifdef DEBUG + { + int z; + for (z=0; z<no_grps; ++z) { + D(("gid[%d]=%d", z, grps[z])); + } + } +#endif + } else { + D(("no supplementary groups known")); + no_grps = 0; + grps = NULL; + } + + here_and_now = time_now(); /* find current time */ + + /* parse the rules in the configuration file */ + do { + int good=TRUE; + + /* here we get the service name field */ + + fd = read_field(pamh,fd,&buffer,&from,&to); + if (!buffer || !buffer[0]) { + /* empty line .. ? */ + continue; + } + ++count; + D(("working on rule #%d",count)); + + good = logic_field(pamh,service, buffer, count, is_same); + D(("with service: %s", good ? "passes":"fails" )); + + /* here we get the terminal name field */ + + fd = read_field(pamh,fd,&buffer,&from,&to); + if (!buffer || !buffer[0]) { + pam_syslog(pamh, LOG_ERR, + "%s: no tty entry #%d", PAM_GROUP_CONF, count); + continue; + } + good &= logic_field(pamh,tty, buffer, count, is_same); + D(("with tty: %s", good ? "passes":"fails" )); + + /* here we get the username field */ + + fd = read_field(pamh,fd,&buffer,&from,&to); + if (!buffer || !buffer[0]) { + pam_syslog(pamh, LOG_ERR, + "%s: no user entry #%d", PAM_GROUP_CONF, count); + continue; + } + /* If buffer starts with @, we are using netgroups */ + if (buffer[0] == '@') + good &= innetgr (&buffer[1], NULL, user, NULL); + else + good &= logic_field(pamh,user, buffer, count, is_same); + D(("with user: %s", good ? "passes":"fails" )); + + /* here we get the time field */ + + fd = read_field(pamh,fd,&buffer,&from,&to); + if (!buffer || !buffer[0]) { + pam_syslog(pamh, LOG_ERR, + "%s: no time entry #%d", PAM_GROUP_CONF, count); + continue; + } + + good &= logic_field(pamh,&here_and_now, buffer, count, check_time); + D(("with time: %s", good ? "passes":"fails" )); + + fd = read_field(pamh,fd,&buffer,&from,&to); + if (!buffer || !buffer[0]) { + pam_syslog(pamh, LOG_ERR, + "%s: no listed groups for rule #%d", PAM_GROUP_CONF, count); + continue; + } + + /* + * so we have a list of groups, we need to turn it into + * something to send to setgroups(2) + */ + + if (good) { + D(("adding %s to gid list", buffer)); + good = mkgrplist(pamh, buffer, &grps, no_grps); + if (good < 0) { + no_grps = 0; + } else { + no_grps = good; + } + } + + /* check the line is terminated correctly */ + + fd = read_field(pamh,fd,&buffer,&from,&to); + if (buffer && buffer[0]) { + pam_syslog(pamh, LOG_ERR, + "%s: poorly terminated rule #%d", PAM_GROUP_CONF, count); + } + + if (good > 0) { + D(("rule #%d passed, added %d groups", count, good)); + } else if (good < 0) { + retval = PAM_BUF_ERR; + } else { + D(("rule #%d failed", count)); + } + + } while (buffer); + + /* now set the groups for the user */ + + if (no_grps > 0) { +#ifdef DEBUG + int err; +#endif + D(("trying to set %d groups", no_grps)); +#ifdef DEBUG + for (err=0; err<no_grps; ++err) { + D(("gid[%d]=%d", err, grps[err])); + } +#endif + if (setgroups(no_grps, grps) != 0) { + D(("but couldn't set groups %m")); + pam_syslog(pamh, LOG_ERR, + "unable to set the group membership for user: %m"); + retval = PAM_CRED_ERR; + } + } + + if (grps) { /* tidy up */ + memset(grps, 0, sizeof(gid_t) * blk_size(no_grps)); + _pam_drop(grps); + no_grps = 0; + } + + return retval; +} + +/* --- public authentication management functions --- */ + +PAM_EXTERN int +pam_sm_authenticate (pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_IGNORE; +} + +PAM_EXTERN int +pam_sm_setcred (pam_handle_t *pamh, int flags, + int argc UNUSED, const char **argv UNUSED) +{ + const void *service=NULL, *void_tty=NULL; + const char *user=NULL; + const char *tty; + int retval; + unsigned setting; + + /* only interested in establishing credentials */ + + setting = flags; + if (!(setting & (PAM_ESTABLISH_CRED | PAM_REINITIALIZE_CRED))) { + D(("ignoring call - not for establishing credentials")); + return PAM_SUCCESS; /* don't fail because of this */ + } + + /* set service name */ + + if (pam_get_item(pamh, PAM_SERVICE, &service) + != PAM_SUCCESS || service == NULL) { + pam_syslog(pamh, LOG_ERR, "cannot find the current service name"); + return PAM_ABORT; + } + + /* set username */ + + if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS || user == NULL + || *user == '\0') { + pam_syslog(pamh, LOG_ERR, "cannot determine the user's name"); + return PAM_USER_UNKNOWN; + } + + /* set tty name */ + + if (pam_get_item(pamh, PAM_TTY, &void_tty) != PAM_SUCCESS + || void_tty == NULL) { + D(("PAM_TTY not set, probing stdin")); + tty = ttyname(STDIN_FILENO); + if (tty == NULL) { + tty = ""; + } + if (pam_set_item(pamh, PAM_TTY, tty) != PAM_SUCCESS) { + pam_syslog(pamh, LOG_ERR, "couldn't set tty name"); + return PAM_ABORT; + } + } + else + tty = (const char *) void_tty; + + if (tty[0] == '/') { /* full path */ + const char *t; + tty++; + if ((t = strchr(tty, '/')) != NULL) { + tty = t + 1; + } + } + + /* good, now we have the service name, the user and the terminal name */ + + D(("service=%s", service)); + D(("user=%s", user)); + D(("tty=%s", tty)); + + retval = check_account(pamh,service,tty,user); /* get groups */ + + return retval; +} + +/* end of module definition */ + +#ifdef PAM_STATIC + +/* static module data */ + +struct pam_module _pam_group_modstruct = { + "pam_group", + pam_sm_authenticate, + pam_sm_setcred, + NULL, + NULL, + NULL, + NULL +}; +#endif diff --git a/modules/pam_group/tst-pam_group b/modules/pam_group/tst-pam_group new file mode 100755 index 00000000..29f7ba06 --- /dev/null +++ b/modules/pam_group/tst-pam_group @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_group.so diff --git a/modules/pam_issue/Makefile.am b/modules/pam_issue/Makefile.am new file mode 100644 index 00000000..8161fd81 --- /dev/null +++ b/modules/pam_issue/Makefile.am @@ -0,0 +1,31 @@ +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README $(MANS) $(XMLS) tst-pam_issue + +man_MANS = pam_issue.8 +XMLS = README.xml pam_issue.8.xml + +TESTS = tst-pam_issue + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_issue.la +pam_issue_la_LIBADD = -L$(top_builddir)/libpam -lpam + +if ENABLE_REGENERATE_MAN +noinst_DATA = README +README: pam_issue.8.xml +-include $(top_srcdir)/Make.xml.rules +endif + diff --git a/modules/pam_issue/Makefile.in b/modules/pam_issue/Makefile.in new file mode 100644 index 00000000..85475625 --- /dev/null +++ b/modules/pam_issue/Makefile.in @@ -0,0 +1,667 @@ +# Makefile.in generated by automake 1.10.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY, to the extent permitted by law; without +# even the implied warranty of MERCHANTABILITY or FITNESS FOR A +# PARTICULAR PURPOSE. + +@SET_MAKE@ + +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + + +VPATH = @srcdir@ +pkgdatadir = $(datadir)/@PACKAGE@ +pkglibdir = $(libdir)/@PACKAGE@ +pkgincludedir = $(includedir)/@PACKAGE@ +am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd +install_sh_DATA = $(install_sh) -c -m 644 +install_sh_PROGRAM = $(install_sh) -c +install_sh_SCRIPT = $(install_sh) 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uninstall-man uninstall-man8 \ + uninstall-securelibLTLIBRARIES + +@ENABLE_REGENERATE_MAN_TRUE@README: pam_issue.8.xml +@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_issue/README b/modules/pam_issue/README new file mode 100644 index 00000000..e3192beb --- /dev/null +++ b/modules/pam_issue/README @@ -0,0 +1,79 @@ +pam_issue — PAM module to add issue file to user prompt + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +pam_issue is a PAM module to prepend an issue file to the username prompt. It +also by default parses escape codes in the issue file similar to some common +getty's (using \x format). + +Recognized escapes: + +\d + + current day + +\l + + name of this tty + +\m + + machine architecture (uname -m) + +\n + + machine's network node hostname (uname -n) + +\o + + domain name of this system + +\r + + release number of operating system (uname -r) + +\t + + current time + +\s + + operating system name (uname -s) + +\u + + number of users currently logged in + +\U + + same as \u except it is suffixed with "user" or "users" (eg. "1 user" or + "10 users") + +\v + + operating system version and build date (uname -v) + +OPTIONS + +noesc + + Turns off escape code parsing. + +issue=issue-file-name + + The file to output if not using the default. + +EXAMPLES + +Add the following line to /etc/pam.d/login to set the user specific issue at +login: + + auth optional pam_issue.so issue=/etc/issue + + +AUTHOR + +pam_issue was written by Ben Collins <bcollins@debian.org>. + diff --git a/modules/pam_issue/README.xml b/modules/pam_issue/README.xml new file mode 100644 index 00000000..b5b61c3a --- /dev/null +++ b/modules/pam_issue/README.xml @@ -0,0 +1,41 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_issue.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_issue.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_issue-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_issue.8.xml" xpointer='xpointer(//refsect1[@id = "pam_issue-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_issue.8.xml" xpointer='xpointer(//refsect1[@id = "pam_issue-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_issue.8.xml" xpointer='xpointer(//refsect1[@id = "pam_issue-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_issue.8.xml" xpointer='xpointer(//refsect1[@id = "pam_issue-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_issue/pam_issue.8 b/modules/pam_issue/pam_issue.8 new file mode 100644 index 00000000..8b580ebe --- /dev/null +++ b/modules/pam_issue/pam_issue.8 @@ -0,0 +1,138 @@ +.\" Title: pam_issue +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_ISSUE" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_issue - PAM module to add issue file to user prompt +.SH "SYNOPSIS" +.HP 13 +\fBpam_issue\.so\fR [noesc] [issue=\fIissue\-file\-name\fR] +.SH "DESCRIPTION" +.PP +pam_issue is a PAM module to prepend an issue file to the username prompt\. It also by default parses escape codes in the issue file similar to some common getty\'s (using \ex format)\. +.PP +Recognized escapes: +.PP +\fB\ed\fR +.RS 4 +current day +.RE +.PP +\fB\el\fR +.RS 4 +name of this tty +.RE +.PP +\fB\em\fR +.RS 4 +machine architecture (uname \-m) +.RE +.PP +\fB\en\fR +.RS 4 +machine\'s network node hostname (uname \-n) +.RE +.PP +\fB\eo\fR +.RS 4 +domain name of this system +.RE +.PP +\fB\er\fR +.RS 4 +release number of operating system (uname \-r) +.RE +.PP +\fB\et\fR +.RS 4 +current time +.RE +.PP +\fB\es\fR +.RS 4 +operating system name (uname \-s) +.RE +.PP +\fB\eu\fR +.RS 4 +number of users currently logged in +.RE +.PP +\fB\eU\fR +.RS 4 +same as \eu except it is suffixed with "user" or "users" (eg\. "1 user" or "10 users") +.RE +.PP +\fB\ev\fR +.RS 4 +operating system version and build date (uname \-v) +.RE +.SH "OPTIONS" +.PP +.PP +\fBnoesc\fR +.RS 4 +Turns off escape code parsing\. +.RE +.PP +\fBissue=\fR\fB\fIissue\-file\-name\fR\fR +.RS 4 +The file to output if not using the default\. +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +Only the +\fBauth\fR +service is supported\. +.SH "RETURN VALUES" +.PP +.PP +PAM_BUF_ERR +.RS 4 +Memory buffer error\. +.RE +.PP +PAM_IGNORE +.RS 4 +The prompt was already changed\. +.RE +.PP +PAM_SERVICE_ERR +.RS 4 +A service module error occured\. +.RE +.PP +PAM_SUCCESS +.RS 4 +The new prompt was set successfull\. +.RE +.SH "EXAMPLES" +.PP +Add the following line to +\fI/etc/pam\.d/login\fR +to set the user specific issue at login: +.sp +.RS 4 +.nf + auth optional pam_issue\.so issue=/etc/issue + +.fi +.RE +.sp +.SH "SEE ALSO" +.PP + +\fBpam.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_issue was written by Ben Collins <bcollins@debian\.org>\. diff --git a/modules/pam_issue/pam_issue.8.xml b/modules/pam_issue/pam_issue.8.xml new file mode 100644 index 00000000..fd0d06ae --- /dev/null +++ b/modules/pam_issue/pam_issue.8.xml @@ -0,0 +1,234 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_issue"> + + <refmeta> + <refentrytitle>pam_issue</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_issue-name"> + <refname>pam_issue</refname> + <refpurpose>PAM module to add issue file to user prompt</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_issue-cmdsynopsis"> + <command>pam_issue.so</command> + <arg choice="opt"> + noesc + </arg> + <arg choice="opt"> + issue=<replaceable>issue-file-name</replaceable> + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_issue-description"> + + <title>DESCRIPTION</title> + + <para> + pam_issue is a PAM module to prepend an issue file to the username + prompt. It also by default parses escape codes in the issue file + similar to some common getty's (using \x format). + </para> + <para> + Recognized escapes: + </para> + <variablelist> + <varlistentry> + <term><emphasis remap='B'>\d</emphasis></term> + <listitem> + <para>current day</para> + </listitem> + </varlistentry> + <varlistentry> + <term><emphasis remap='B'>\l</emphasis></term> + <listitem> + <para>name of this tty</para> + </listitem> + </varlistentry> + <varlistentry> + <term><emphasis remap='B'>\m</emphasis></term> + <listitem> + <para>machine architecture (uname -m)</para> + </listitem> + </varlistentry> + <varlistentry> + <term><emphasis remap='B'>\n</emphasis></term> + <listitem> + <para>machine's network node hostname (uname -n)</para> + </listitem> + </varlistentry> + <varlistentry> + <term><emphasis remap='B'>\o</emphasis></term> + <listitem> + <para>domain name of this system</para> + </listitem> + </varlistentry> + <varlistentry> + <term><emphasis remap='B'>\r</emphasis></term> + <listitem> + <para>release number of operating system (uname -r)</para> + </listitem> + </varlistentry> + <varlistentry> + <term><emphasis remap='B'>\t</emphasis></term> + <listitem> + <para>current time</para> + </listitem> + </varlistentry> + <varlistentry> + <term><emphasis remap='B'>\s</emphasis></term> + <listitem> + <para>operating system name (uname -s)</para> + </listitem> + </varlistentry> + <varlistentry> + <term><emphasis remap='B'>\u</emphasis></term> + <listitem> + <para>number of users currently logged in</para> + </listitem> + </varlistentry> + <varlistentry> + <term><emphasis remap='B'>\U</emphasis></term> + <listitem> + <para> + same as \u except it is suffixed with "user" or + "users" (eg. "1 user" or "10 users") + </para> + </listitem> + </varlistentry> + <varlistentry> + <term><emphasis remap='B'>\v</emphasis></term> + <listitem> + <para>operating system version and build date (uname -v)</para> + </listitem> + </varlistentry> + </variablelist> + + </refsect1> + + <refsect1 id="pam_issue-options"> + + <title>OPTIONS</title> + <para> + <variablelist> + + <varlistentry> + <term> + <option>noesc</option> + </term> + <listitem> + <para> + Turns off escape code parsing. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>issue=<replaceable>issue-file-name</replaceable></option> + </term> + <listitem> + <para> + The file to output if not using the default. + </para> + </listitem> + </varlistentry> + + </variablelist> + + </para> + </refsect1> + + <refsect1 id="pam_issue-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + Only the <option>auth</option> service is supported. + </para> + </refsect1> + + <refsect1 id='pam_issue-return_values'> + <title>RETURN VALUES</title> + <para> + <variablelist> + + <varlistentry> + <term>PAM_BUF_ERR</term> + <listitem> + <para> + Memory buffer error. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_IGNORE</term> + <listitem> + <para> + The prompt was already changed. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_SERVICE_ERR</term> + <listitem> + <para> + A service module error occured. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + The new prompt was set successfull. + </para> + </listitem> + </varlistentry> + + </variablelist> + </para> + </refsect1> + + <refsect1 id='pam_issue-examples'> + <title>EXAMPLES</title> + <para> + Add the following line to <filename>/etc/pam.d/login</filename> to + set the user specific issue at login: + <programlisting> + auth optional pam_issue.so issue=/etc/issue + </programlisting> + </para> + </refsect1> + + <refsect1 id='pam_issue-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_issue-author'> + <title>AUTHOR</title> + <para> + pam_issue was written by Ben Collins <bcollins@debian.org>. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_issue/pam_issue.c b/modules/pam_issue/pam_issue.c new file mode 100644 index 00000000..7a8a24d5 --- /dev/null +++ b/modules/pam_issue/pam_issue.c @@ -0,0 +1,310 @@ +/* pam_issue module - a simple /etc/issue parser to set PAM_USER_PROMPT + * + * Copyright 1999 by Ben Collins <bcollins@debian.org> + * + * Needs to be called before any other auth modules so we can setup the + * user prompt before it's first used. Allows one argument option, which + * is the full path to a file to be used for issue (uses /etc/issue as a + * default) such as "issue=/etc/issue.telnet". + * + * We can also parse escapes within the the issue file (enabled by + * default, but can be disabled with the "noesc" option). It's the exact + * same parsing as util-linux's agetty program performs. + * + * Released under the GNU LGPL version 2 or later + */ + +#include "config.h" + +#include <string.h> +#include <stdio.h> +#include <stdlib.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <string.h> +#include <unistd.h> +#include <sys/utsname.h> +#include <utmp.h> +#include <time.h> +#include <syslog.h> + +#define PAM_SM_AUTH + +#include <security/_pam_macros.h> +#include <security/pam_modules.h> +#include <security/pam_ext.h> + +static int _user_prompt_set = 0; + +static int read_issue_raw(pam_handle_t *pamh, FILE *fp, char **prompt); +static int read_issue_quoted(pam_handle_t *pamh, FILE *fp, char **prompt); + +/* --- authentication management functions (only) --- */ + +PAM_EXTERN int +pam_sm_authenticate (pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + int retval = PAM_SERVICE_ERR; + FILE *fp; + const char *issue_file = NULL; + int parse_esc = 1; + const void *item = NULL; + const char *cur_prompt; + char *issue_prompt = NULL; + + /* If we've already set the prompt, don't set it again */ + if(_user_prompt_set) + return PAM_IGNORE; + + /* We set this here so if we fail below, we wont get further + than this next time around (only one real failure) */ + _user_prompt_set = 1; + + for ( ; argc-- > 0 ; ++argv ) { + if (!strncmp(*argv,"issue=",6)) { + issue_file = 6 + *argv; + D(("set issue_file to: %s", issue_file)); + } else if (!strcmp(*argv,"noesc")) { + parse_esc = 0; + D(("turning off escape parsing by request")); + } else + D(("unknown option passed: %s", *argv)); + } + + if (issue_file == NULL) + issue_file = "/etc/issue"; + + if ((fp = fopen(issue_file, "r")) == NULL) { + pam_syslog(pamh, LOG_ERR, "error opening %s: %m", issue_file); + return PAM_SERVICE_ERR; + } + + if ((retval = pam_get_item(pamh, PAM_USER_PROMPT, &item)) != PAM_SUCCESS) { + fclose(fp); + return retval; + } + + cur_prompt = item; + if (cur_prompt == NULL) + cur_prompt = ""; + + if (parse_esc) + retval = read_issue_quoted(pamh, fp, &issue_prompt); + else + retval = read_issue_raw(pamh, fp, &issue_prompt); + + fclose(fp); + + if (retval != PAM_SUCCESS) + goto out; + + { + size_t size = strlen(issue_prompt) + strlen(cur_prompt) + 1; + char *new_prompt = realloc(issue_prompt, size); + + if (new_prompt == NULL) { + pam_syslog(pamh, LOG_ERR, "out of memory"); + retval = PAM_BUF_ERR; + goto out; + } + issue_prompt = new_prompt; + } + + strcat(issue_prompt, cur_prompt); + retval = pam_set_item(pamh, PAM_USER_PROMPT, + (const void *) issue_prompt); + out: + _pam_drop(issue_prompt); + return (retval == PAM_SUCCESS) ? PAM_IGNORE : retval; +} + +PAM_EXTERN int +pam_sm_setcred (pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_IGNORE; +} + +static int +read_issue_raw(pam_handle_t *pamh, FILE *fp, char **prompt) +{ + char *issue; + struct stat st; + + *prompt = NULL; + + if (fstat(fileno(fp), &st) < 0) { + pam_syslog(pamh, LOG_ERR, "stat error: %m"); + return PAM_SERVICE_ERR; + } + + if ((issue = malloc(st.st_size + 1)) == NULL) { + pam_syslog(pamh, LOG_ERR, "out of memory"); + return PAM_BUF_ERR; + } + + if (fread(issue, 1, st.st_size, fp) != st.st_size) { + pam_syslog(pamh, LOG_ERR, "read error: %m"); + _pam_drop(issue); + return PAM_SERVICE_ERR; + } + + issue[st.st_size] = '\0'; + *prompt = issue; + return PAM_SUCCESS; +} + +static int +read_issue_quoted(pam_handle_t *pamh, FILE *fp, char **prompt) +{ + int c; + size_t size = 1024; + char *issue; + struct utsname uts; + + *prompt = NULL; + + if ((issue = malloc(size)) == NULL) { + pam_syslog(pamh, LOG_ERR, "out of memory"); + return PAM_BUF_ERR; + } + + issue[0] = '\0'; + (void) uname(&uts); + + while ((c = getc(fp)) != EOF) { + char buf[1024]; + + buf[0] = '\0'; + if (c == '\\') { + if ((c = getc(fp)) == EOF) + break; + switch (c) { + case 's': + strncat(buf, uts.sysname, sizeof(buf) - 1); + break; + case 'n': + strncat(buf, uts.nodename, sizeof(buf) - 1); + break; + case 'r': + strncat(buf, uts.release, sizeof(buf) - 1); + break; + case 'v': + strncat(buf, uts.version, sizeof(buf) - 1); + break; + case 'm': + strncat(buf, uts.machine, sizeof(buf) - 1); + break; + case 'o': + { + char domainname[256]; + + if (getdomainname(domainname, sizeof(domainname)) >= 0) { + domainname[sizeof(domainname)-1] = '\0'; + strncat(buf, domainname, sizeof(buf) - 1); + } + } + break; + case 'd': + case 't': + { + const char *weekday[] = { + "Sun", "Mon", "Tue", "Wed", "Thu", + "Fri", "Sat" }; + const char *month[] = { + "Jan", "Feb", "Mar", "Apr", "May", + "Jun", "Jul", "Aug", "Sep", "Oct", + "Nov", "Dec" }; + time_t now; + struct tm *tm; + + (void) time (&now); + tm = localtime(&now); + + if (c == 'd') + snprintf (buf, sizeof buf, "%s %s %d %d", + weekday[tm->tm_wday], month[tm->tm_mon], + tm->tm_mday, tm->tm_year + 1900); + else + snprintf (buf, sizeof buf, "%02d:%02d:%02d", + tm->tm_hour, tm->tm_min, tm->tm_sec); + } + break; + case 'l': + { + char *ttyn = ttyname(1); + if (ttyn) { + if (!strncmp(ttyn, "/dev/", 5)) + ttyn += 5; + strncat(buf, ttyn, sizeof(buf) - 1); + } + } + break; + case 'u': + case 'U': + { + unsigned int users = 0; + struct utmp *ut; + setutent(); + while ((ut = getutent())) { + if (ut->ut_type == USER_PROCESS) + ++users; + } + endutent(); + if (c == 'U') + snprintf (buf, sizeof buf, "%u %s", users, + (users == 1) ? "user" : "users"); + else + snprintf (buf, sizeof buf, "%u", users); + break; + } + default: + buf[0] = c; buf[1] = '\0'; + } + } else { + buf[0] = c; buf[1] = '\0'; + } + + if ((strlen(issue) + strlen(buf)) + 1 > size) { + char *new_issue; + + size += strlen(buf) + 1; + new_issue = (char *) realloc (issue, size); + if (new_issue == NULL) { + _pam_drop(issue); + return PAM_BUF_ERR; + } + issue = new_issue; + strcat(issue, buf); + } + } + + if (ferror(fp)) { + pam_syslog(pamh, LOG_ERR, "read error: %m"); + _pam_drop(issue); + return PAM_SERVICE_ERR; + } + + *prompt = issue; + return PAM_SUCCESS; +} + +#ifdef PAM_STATIC + +/* static module data */ + +struct pam_module _pam_issue_modstruct = { + "pam_issue", + pam_sm_authenticate, + pam_sm_setcred, + NULL, + NULL, + NULL, + NULL, +}; + +#endif + +/* end of module definition */ diff --git a/modules/pam_issue/tst-pam_issue b/modules/pam_issue/tst-pam_issue new file mode 100755 index 00000000..0fe4f763 --- /dev/null +++ b/modules/pam_issue/tst-pam_issue @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_issue.so diff --git a/modules/pam_keyinit/Makefile.am b/modules/pam_keyinit/Makefile.am new file mode 100644 index 00000000..5039705a --- /dev/null +++ b/modules/pam_keyinit/Makefile.am @@ -0,0 +1,33 @@ +# +# Copyright (c) 2006 David Howells <dhowells@redhat.com> +# + +CLEANFILES = *~ + +EXTRA_DIST = README $(XMLS) pam_keyinit.8 tst-pam_keyinit +XMLS = README.xml pam_keyinit.8.xml + +if HAVE_KEY_MANAGEMENT + man_MANS = pam_keyinit.8 + TESTS = tst-pam_keyinit +endif + +if ENABLE_REGENERATE_MAN +noinst_DATA = README +README: pam_keyinit.8.xml +-include $(top_srcdir)/Make.xml.rules +endif + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +if HAVE_KEY_MANAGEMENT + securelib_LTLIBRARIES = pam_keyinit.la +endif +pam_keyinit_la_LIBADD = -L$(top_builddir)/libpam -lpam diff --git a/modules/pam_keyinit/Makefile.in b/modules/pam_keyinit/Makefile.in new file mode 100644 index 00000000..cdc28d60 --- /dev/null +++ b/modules/pam_keyinit/Makefile.in @@ -0,0 +1,669 @@ +# Makefile.in generated by automake 1.10.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY, to the extent permitted by law; without +# even the implied warranty of MERCHANTABILITY or FITNESS FOR A +# PARTICULAR PURPOSE. + +@SET_MAKE@ + +# +# Copyright (c) 2006 David Howells <dhowells@redhat.com> +# + + +VPATH = @srcdir@ +pkgdatadir = $(datadir)/@PACKAGE@ +pkglibdir = $(libdir)/@PACKAGE@ +pkgincludedir = $(includedir)/@PACKAGE@ +am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd +install_sh_DATA = $(install_sh) -c -m 644 +install_sh_PROGRAM = $(install_sh) -c +install_sh_SCRIPT = $(install_sh) -c +INSTALL_HEADER = $(INSTALL_DATA) +transform = $(program_transform_name) +NORMAL_INSTALL = : +PRE_INSTALL = : +POST_INSTALL = : +NORMAL_UNINSTALL = : +PRE_UNINSTALL = : +POST_UNINSTALL = : +build_triplet = @build@ +host_triplet = @host@ +@HAVE_VERSIONING_TRUE@am__append_1 = -Wl,--version-script=$(srcdir)/../modules.map +subdir = modules/pam_keyinit +DIST_COMMON = README $(srcdir)/Makefile.am $(srcdir)/Makefile.in +ACLOCAL_M4 = $(top_srcdir)/aclocal.m4 +am__aclocal_m4_deps = $(top_srcdir)/m4/gettext.m4 \ + $(top_srcdir)/m4/iconv.m4 \ + $(top_srcdir)/m4/jh_path_xml_catalog.m4 \ + $(top_srcdir)/m4/ld-O1.m4 $(top_srcdir)/m4/ld-as-needed.m4 \ + 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00000000..38344d9a --- /dev/null +++ b/modules/pam_keyinit/README @@ -0,0 +1,68 @@ +pam_keyinit — Kernel session keyring initialiser module + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +The pam_keyinit PAM module ensures that the invoking process has a session +keyring other than the user default session keyring. + +The session component of the module checks to see if the process's session +keyring is the user default, and, if it is, creates a new anonymous session +keyring with which to replace it. + +If a new session keyring is created, it will install a link to the user common +keyring in the session keyring so that keys common to the user will be +automatically accessible through it. + +The session keyring of the invoking process will thenceforth be inherited by +all its children unless they override it. + +This module is intended primarily for use by login processes. Be aware that +after the session keyring has been replaced, the old session keyring and the +keys it contains will no longer be accessible. + +This module should not, generally, be invoked by programs like su, since it is +usually desirable for the key set to percolate through to the alternate +context. The keys have their own permissions system to manage this. + +This module should be included as early as possible in a PAM configuration, so +that other PAM modules can attach tokens to the keyring. + +The keyutils package is used to manipulate keys more directly. This can be +obtained from: + +Keyutils + +OPTIONS + +debug + + Log debug information with syslog(3). + +force + + Causes the session keyring of the invoking process to be replaced + unconditionally. + +revoke + + Causes the session keyring of the invoking process to be revoked when the + invoking process exits if the session keyring was created for this process + in the first place. + +EXAMPLES + +Add this line to your login entries to start each login session with its own +session keyring: + +session required pam_keyinit.so + + +This will prevent keys from one session leaking into another session for the +same user. + +AUTHOR + +pam_keyinit was written by David Howells, <dhowells@redhat.com>. + diff --git a/modules/pam_keyinit/README.xml b/modules/pam_keyinit/README.xml new file mode 100644 index 00000000..47659e89 --- /dev/null +++ b/modules/pam_keyinit/README.xml @@ -0,0 +1,41 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_keyinit.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_keyinit.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_keyinit-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_keyinit.8.xml" xpointer='xpointer(//refsect1[@id = "pam_keyinit-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_keyinit.8.xml" xpointer='xpointer(//refsect1[@id = "pam_keyinit-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_keyinit.8.xml" xpointer='xpointer(//refsect1[@id = "pam_keyinit-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_keyinit.8.xml" xpointer='xpointer(//refsect1[@id = "pam_keyinit-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_keyinit/pam_keyinit.8 b/modules/pam_keyinit/pam_keyinit.8 new file mode 100644 index 00000000..25e27137 --- /dev/null +++ b/modules/pam_keyinit/pam_keyinit.8 @@ -0,0 +1,124 @@ +.\" Title: pam_keyinit +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_KEYINIT" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_keyinit - Kernel session keyring initialiser module +.SH "SYNOPSIS" +.HP 15 +\fBpam_keyinit\.so\fR [debug] [force] [revoke] +.SH "DESCRIPTION" +.PP +The pam_keyinit PAM module ensures that the invoking process has a session keyring other than the user default session keyring\. +.PP +The session component of the module checks to see if the process\'s session keyring is the user default, and, if it is, creates a new anonymous session keyring with which to replace it\. +.PP +If a new session keyring is created, it will install a link to the user common keyring in the session keyring so that keys common to the user will be automatically accessible through it\. +.PP +The session keyring of the invoking process will thenceforth be inherited by all its children unless they override it\. +.PP +This module is intended primarily for use by login processes\. Be aware that after the session keyring has been replaced, the old session keyring and the keys it contains will no longer be accessible\. +.PP +This module should not, generally, be invoked by programs like +\fBsu\fR, since it is usually desirable for the key set to percolate through to the alternate context\. The keys have their own permissions system to manage this\. +.PP +This module should be included as early as possible in a PAM configuration, so that other PAM modules can attach tokens to the keyring\. +.PP +The keyutils package is used to manipulate keys more directly\. This can be obtained from: +.PP + +\fI Keyutils \fR\&[1] +.SH "OPTIONS" +.PP +\fBdebug\fR +.RS 4 +Log debug information with +\fBsyslog\fR(3)\. +.RE +.PP +\fBforce\fR +.RS 4 +Causes the session keyring of the invoking process to be replaced unconditionally\. +.RE +.PP +\fBrevoke\fR +.RS 4 +Causes the session keyring of the invoking process to be revoked when the invoking process exits if the session keyring was created for this process in the first place\. +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +Only the +\fBsession\fR +service is supported\. +.SH "RETURN VALUES" +.PP +PAM_SUCCESS +.RS 4 +This module will usually return this value +.RE +.PP +PAM_AUTH_ERR +.RS 4 +Authentication failure\. +.RE +.PP +PAM_BUF_ERR +.RS 4 +Memory buffer error\. +.RE +.PP +PAM_IGNORE +.RS 4 +The return value should be ignored by PAM dispatch\. +.RE +.PP +PAM_SERVICE_ERR +.RS 4 +Cannot determine the user name\. +.RE +.PP +PAM_SESSION_ERR +.RS 4 +This module will return this value if its arguments are invalid or if a system error such as ENOMEM occurs\. +.RE +.PP +PAM_USER_UNKNOWN +.RS 4 +User not known\. +.RE +.SH "EXAMPLES" +.PP +Add this line to your login entries to start each login session with its own session keyring: +.sp +.RS 4 +.nf +session required pam_keyinit\.so + +.fi +.RE +.PP +This will prevent keys from one session leaking into another session for the same user\. +.SH "SEE ALSO" +.PP + +\fBpam.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8) +\fBkeyctl\fR(1) +.SH "AUTHOR" +.PP +pam_keyinit was written by David Howells, <dhowells@redhat\.com>\. +.SH "NOTES" +.IP " 1." 4 +Keyutils +.RS 4 +\%http://people.redhat.com/~dhowells/keyutils/ +.RE diff --git a/modules/pam_keyinit/pam_keyinit.8.xml b/modules/pam_keyinit/pam_keyinit.8.xml new file mode 100644 index 00000000..c7dddf54 --- /dev/null +++ b/modules/pam_keyinit/pam_keyinit.8.xml @@ -0,0 +1,241 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_keyinit"> + + <refmeta> + <refentrytitle>pam_keyinit</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_keyinit-name"> + <refname>pam_keyinit</refname> + <refpurpose>Kernel session keyring initialiser module</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_keyinit-cmdsynopsis"> + <command>pam_keyinit.so</command> + <arg choice="opt"> + debug + </arg> + <arg choice="opt"> + force + </arg> + <arg choice="opt"> + revoke + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_keyinit-description"> + <title>DESCRIPTION</title> + <para> + The pam_keyinit PAM module ensures that the invoking process has a + session keyring other than the user default session keyring. + </para> + <para> + The session component of the module checks to see if the process's + session keyring is the user default, and, if it is, creates a new + anonymous session keyring with which to replace it. + </para> + <para> + If a new session keyring is created, it will install a link to the user + common keyring in the session keyring so that keys common to the user + will be automatically accessible through it. + </para> + <para> + The session keyring of the invoking process will thenceforth be inherited + by all its children unless they override it. + </para> + <para> + This module is intended primarily for use by login processes. Be aware + that after the session keyring has been replaced, the old session keyring + and the keys it contains will no longer be accessible. + </para> + <para> + This module should not, generally, be invoked by programs like + <emphasis remap='B'>su</emphasis>, since it is usually desirable for the + key set to percolate through to the alternate context. The keys have + their own permissions system to manage this. + </para> + <para> + This module should be included as early as possible in a PAM + configuration, so that other PAM modules can attach tokens to the + keyring. + </para> + <para> + The keyutils package is used to manipulate keys more directly. This + can be obtained from: + </para> + <para> + <ulink url="http://people.redhat.com/~dhowells/keyutils/"> + Keyutils + </ulink> + </para> + </refsect1> + + <refsect1 id="pam_keyinit-options"> + <title>OPTIONS</title> + <variablelist> + <varlistentry> + <term> + <option>debug</option> + </term> + <listitem> + <para> + Log debug information with <citerefentry> + <refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum> + </citerefentry>. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>force</option> + </term> + <listitem> + <para> + Causes the session keyring of the invoking process to be replaced + unconditionally. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>revoke</option> + </term> + <listitem> + <para> + Causes the session keyring of the invoking process to be revoked + when the invoking process exits if the session keyring was created + for this process in the first place. + </para> + </listitem> + </varlistentry> + + </variablelist> + </refsect1> + + <refsect1 id="pam_keyinit-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + Only the <emphasis remap='B'>session</emphasis> service is supported. + </para> + </refsect1> + + <refsect1 id='pam_keyinit-return_values'> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + This module will usually return this value + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_AUTH_ERR</term> + <listitem> + <para> + Authentication failure. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_BUF_ERR</term> + <listitem> + <para> + Memory buffer error. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_IGNORE</term> + <listitem> + <para> + The return value should be ignored by PAM dispatch. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_SERVICE_ERR</term> + <listitem> + <para> + Cannot determine the user name. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_SESSION_ERR</term> + <listitem> + <para> + This module will return this value if its arguments are invalid or + if a system error such as ENOMEM occurs. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_USER_UNKNOWN</term> + <listitem> + <para> + User not known. + </para> + </listitem> + </varlistentry> + + </variablelist> + </refsect1> + + <refsect1 id='pam_keyinit-examples'> + <title>EXAMPLES</title> + <para> + Add this line to your login entries to start each login session with its + own session keyring: + <programlisting> +session required pam_keyinit.so + </programlisting> + </para> + <para> + This will prevent keys from one session leaking into another session for + the same user. + </para> + </refsect1> + + <refsect1 id='pam_keyinit-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + <citerefentry> + <refentrytitle>keyctl</refentrytitle><manvolnum>1</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_keyinit-author'> + <title>AUTHOR</title> + <para> + pam_keyinit was written by David Howells, <dhowells@redhat.com>. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_keyinit/pam_keyinit.c b/modules/pam_keyinit/pam_keyinit.c new file mode 100644 index 00000000..378a7723 --- /dev/null +++ b/modules/pam_keyinit/pam_keyinit.c @@ -0,0 +1,269 @@ +/* pam_keyinit.c: Initialise the session keyring on login through a PAM module + * + * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#include "config.h" +#include <stdarg.h> +#include <string.h> +#include <syslog.h> +#include <pwd.h> +#include <unistd.h> +#include <errno.h> +#include <security/pam_modules.h> +#include <security/pam_modutil.h> +#include <security/pam_ext.h> +#include <sys/syscall.h> + +#define KEY_SPEC_SESSION_KEYRING -3 /* ID for session keyring */ +#define KEY_SPEC_USER_KEYRING -4 /* ID for UID-specific keyring */ +#define KEY_SPEC_USER_SESSION_KEYRING -5 /* - key ID for UID-session keyring */ + +#define KEYCTL_GET_KEYRING_ID 0 /* ask for a keyring's ID */ +#define KEYCTL_JOIN_SESSION_KEYRING 1 /* start named session keyring */ +#define KEYCTL_REVOKE 3 /* revoke a key */ +#define KEYCTL_LINK 8 /* link a key into a keyring */ + +static int my_session_keyring; +static int session_counter; +static int do_revoke; +static int revoke_as_uid; +static int revoke_as_gid; +static int xdebug = 0; + +static void debug(pam_handle_t *pamh, const char *fmt, ...) + __attribute__((format(printf, 2, 3))); + +static void debug(pam_handle_t *pamh, const char *fmt, ...) +{ + va_list va; + + if (xdebug) { + va_start(va, fmt); + pam_vsyslog(pamh, LOG_DEBUG, fmt, va); + va_end(va); + } +} + +static int error(pam_handle_t *pamh, const char *fmt, ...) + __attribute__((format(printf, 2, 3))); + +static int error(pam_handle_t *pamh, const char *fmt, ...) +{ + va_list va; + + va_start(va, fmt); + pam_vsyslog(pamh, LOG_ERR, fmt, va); + va_end(va); + + return PAM_SESSION_ERR; +} + +/* + * initialise the session keyring for this process + */ +static int init_keyrings(pam_handle_t *pamh, int force) +{ + int session, usession, ret; + + if (!force) { + /* get the IDs of the session keyring and the user session + * keyring */ + session = syscall(__NR_keyctl, + KEYCTL_GET_KEYRING_ID, + KEY_SPEC_SESSION_KEYRING, + 0); + debug(pamh, "GET SESSION = %d", session); + if (session < 0) { + /* don't worry about keyrings if facility not + * installed */ + if (errno == ENOSYS) + return PAM_SUCCESS; + return PAM_SESSION_ERR; + } + + usession = syscall(__NR_keyctl, + KEYCTL_GET_KEYRING_ID, + KEY_SPEC_USER_SESSION_KEYRING, + 0); + debug(pamh, "GET SESSION = %d", usession); + if (usession < 0) + return PAM_SESSION_ERR; + + /* if the user session keyring is our keyring, then we don't + * need to do anything if we're not forcing */ + if (session != usession) + return PAM_SUCCESS; + } + + /* create a session keyring, discarding the old one */ + ret = syscall(__NR_keyctl, + KEYCTL_JOIN_SESSION_KEYRING, + NULL); + debug(pamh, "JOIN = %d", ret); + if (ret < 0) + return PAM_SESSION_ERR; + + my_session_keyring = ret; + + /* make a link from the session keyring to the user keyring */ + ret = syscall(__NR_keyctl, + KEYCTL_LINK, + KEY_SPEC_USER_KEYRING, + KEY_SPEC_SESSION_KEYRING); + + return ret < 0 ? PAM_SESSION_ERR : PAM_SUCCESS; +} + +/* + * revoke the session keyring for this process + */ +static void kill_keyrings(pam_handle_t *pamh) +{ + int old_uid, old_gid; + + /* revoke the session keyring we created earlier */ + if (my_session_keyring > 0) { + debug(pamh, "REVOKE %d", my_session_keyring); + + old_uid = geteuid(); + old_gid = getegid(); + debug(pamh, "UID:%d [%d] GID:%d [%d]", + revoke_as_uid, old_uid, revoke_as_gid, old_gid); + + /* switch to the real UID and GID so that we have permission to + * revoke the key */ + if (revoke_as_gid != old_gid && setregid(-1, revoke_as_gid) < 0) + error(pamh, "Unable to change GID to %d temporarily\n", + revoke_as_gid); + + if (revoke_as_uid != old_uid && setreuid(-1, revoke_as_uid) < 0) + error(pamh, "Unable to change UID to %d temporarily\n", + revoke_as_uid); + + syscall(__NR_keyctl, + KEYCTL_REVOKE, + my_session_keyring); + + /* return to the orignal UID and GID (probably root) */ + if (revoke_as_uid != old_uid && setreuid(-1, old_uid) < 0) + error(pamh, "Unable to change UID back to %d\n", old_uid); + + if (revoke_as_gid != old_gid && setregid(-1, old_gid) < 0) + error(pamh, "Unable to change GID back to %d\n", old_gid); + + my_session_keyring = 0; + } +} + +/* + * open a PAM session by making sure there's a session keyring + */ +PAM_EXTERN +int pam_sm_open_session(pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + struct passwd *pw; + const char *username; + int ret, old_uid, uid, old_gid, gid, loop, force = 0; + + for (loop = 0; loop < argc; loop++) { + if (strcmp(argv[loop], "force") == 0) + force = 1; + else if (strcmp(argv[loop], "debug") == 0) + xdebug = 1; + else if (strcmp(argv[loop], "revoke") == 0) + do_revoke = 1; + } + + /* don't do anything if already created a keyring (will be called + * multiple times if mentioned more than once in a pam script) + */ + session_counter++; + + debug(pamh, "OPEN %d", session_counter); + + if (my_session_keyring > 0) + return PAM_SUCCESS; + + /* look up the target UID */ + ret = pam_get_user(pamh, &username, "key user"); + if (ret != PAM_SUCCESS) + return ret; + + pw = pam_modutil_getpwnam(pamh, username); + if (!pw) { + error(pamh, "Unable to look up user \"%s\"\n", username); + return PAM_USER_UNKNOWN; + } + + revoke_as_uid = uid = pw->pw_uid; + old_uid = getuid(); + revoke_as_gid = gid = pw->pw_gid; + old_gid = getgid(); + debug(pamh, "UID:%d [%d] GID:%d [%d]", uid, old_uid, gid, old_gid); + + /* switch to the real UID and GID so that the keyring ends up owned by + * the right user */ + if (gid != old_gid && setregid(gid, -1) < 0) { + error(pamh, "Unable to change GID to %d temporarily\n", gid); + return PAM_SESSION_ERR; + } + + if (uid != old_uid && setreuid(uid, -1) < 0) { + error(pamh, "Unable to change UID to %d temporarily\n", uid); + setregid(old_gid, -1); + return PAM_SESSION_ERR; + } + + ret = init_keyrings(pamh, force); + + /* return to the orignal UID and GID (probably root) */ + if (uid != old_uid && setreuid(old_uid, -1) < 0) + ret = error(pamh, "Unable to change UID back to %d\n", old_uid); + + if (gid != old_gid && setregid(old_gid, -1) < 0) + ret = error(pamh, "Unable to change GID back to %d\n", old_gid); + + return ret; +} + +/* + * close a PAM session by revoking the session keyring if requested + */ +PAM_EXTERN +int pam_sm_close_session(pam_handle_t *pamh, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + debug(pamh, "CLOSE %d,%d,%d", + session_counter, my_session_keyring, do_revoke); + + session_counter--; + + if (session_counter == 0 && my_session_keyring > 0 && do_revoke) + kill_keyrings(pamh); + + return PAM_SUCCESS; +} + +#ifdef PAM_STATIC + +/* static module data */ + +struct pam_module _pam_keyinit_modstruct = { + "pam_keyinit", + NULL, + NULL, + NULL, + pam_sm_open_session, + pam_sm_close_session, + NULL +}; +#endif + diff --git a/modules/pam_keyinit/tst-pam_keyinit b/modules/pam_keyinit/tst-pam_keyinit new file mode 100755 index 00000000..f0a7b9bc --- /dev/null +++ b/modules/pam_keyinit/tst-pam_keyinit @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_keyinit.so diff --git a/modules/pam_lastlog/Makefile.am b/modules/pam_lastlog/Makefile.am new file mode 100644 index 00000000..899bda7b --- /dev/null +++ b/modules/pam_lastlog/Makefile.am @@ -0,0 +1,31 @@ +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +EXTRA_DIST = README $(MANS) $(XMLS) tst-pam_lastlog + +man_MANS = pam_lastlog.8 +XMLS = README.xml pam_lastlog.8.xml + +TESTS = tst-pam_lastlog + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_lastlog.la +pam_lastlog_la_LIBADD = -L$(top_builddir)/libpam -lpam -lutil + +if ENABLE_REGENERATE_MAN +noinst_DATA = README +README: pam_lastlog.8.xml +-include $(top_srcdir)/Make.xml.rules +endif + diff --git a/modules/pam_lastlog/Makefile.in b/modules/pam_lastlog/Makefile.in new file mode 100644 index 00000000..6bd440a2 --- /dev/null +++ b/modules/pam_lastlog/Makefile.in @@ -0,0 +1,667 @@ +# Makefile.in generated by automake 1.10.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY, to the extent permitted by law; without +# even the implied warranty of MERCHANTABILITY or FITNESS FOR A +# PARTICULAR PURPOSE. + +@SET_MAKE@ + +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + + 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install-ps install-ps-am \ + install-securelibLTLIBRARIES install-strip installcheck \ + installcheck-am installdirs maintainer-clean \ + maintainer-clean-generic mostlyclean mostlyclean-compile \ + mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \ + tags uninstall uninstall-am uninstall-man uninstall-man8 \ + uninstall-securelibLTLIBRARIES + +@ENABLE_REGENERATE_MAN_TRUE@README: pam_lastlog.8.xml +@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_lastlog/README b/modules/pam_lastlog/README new file mode 100644 index 00000000..9f6c5505 --- /dev/null +++ b/modules/pam_lastlog/README @@ -0,0 +1,57 @@ +pam_lastlog — PAM module to display date of last login + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +pam_lastlog is a PAM module to display a line of information about the last +login of the user. In addition, the module maintains the /var/log/lastlog file. + +Some applications may perform this function themselves. In such cases, this +module is not necessary. + +OPTIONS + +debug + + Print debug information. + +silent + + Don't inform the user about any previous login, just upate the /var/log/ + lastlog file. + +never + + If the /var/log/lastlog file does not contain any old entries for the user, + indicate that the user has never previously logged in with a welcome + message. + +nodate + + Don't display the date of the last login. + +noterm + + Don't display the terminal name on which the last login was attempted. + +nohost + + Don't indicate from which host the last login was attempted. + +nowtmp + + Don't update the wtmp entry. + +EXAMPLES + +Add the following line to /etc/pam.d/login to display the last login time of an +user: + + session required pam_lastlog.so nowtmp + + +AUTHOR + +pam_lastlog was written by Andrew G. Morgan <morgan@kernel.org>. + diff --git a/modules/pam_lastlog/README.xml b/modules/pam_lastlog/README.xml new file mode 100644 index 00000000..7fe70339 --- /dev/null +++ b/modules/pam_lastlog/README.xml @@ -0,0 +1,41 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_lastlog.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_lastlog.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_lastlog-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_lastlog.8.xml" xpointer='xpointer(//refsect1[@id = "pam_lastlog-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_lastlog.8.xml" xpointer='xpointer(//refsect1[@id = "pam_lastlog-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_lastlog.8.xml" xpointer='xpointer(//refsect1[@id = "pam_lastlog-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_lastlog.8.xml" xpointer='xpointer(//refsect1[@id = "pam_lastlog-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_lastlog/pam_lastlog.8 b/modules/pam_lastlog/pam_lastlog.8 new file mode 100644 index 00000000..e822c84b --- /dev/null +++ b/modules/pam_lastlog/pam_lastlog.8 @@ -0,0 +1,113 @@ +.\" Title: pam_lastlog +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_LASTLOG" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_lastlog - PAM module to display date of last login +.SH "SYNOPSIS" +.HP 15 +\fBpam_lastlog\.so\fR [debug] [silent] [never] [nodate] [nohost] [noterm] [nowtmp] +.SH "DESCRIPTION" +.PP +pam_lastlog is a PAM module to display a line of information about the last login of the user\. In addition, the module maintains the +\fI/var/log/lastlog\fR +file\. +.PP +Some applications may perform this function themselves\. In such cases, this module is not necessary\. +.SH "OPTIONS" +.PP +\fBdebug\fR +.RS 4 +Print debug information\. +.RE +.PP +\fBsilent\fR +.RS 4 +Don\'t inform the user about any previous login, just upate the +\fI/var/log/lastlog\fR +file\. +.RE +.PP +\fBnever\fR +.RS 4 +If the +\fI/var/log/lastlog\fR +file does not contain any old entries for the user, indicate that the user has never previously logged in with a welcome message\. +.RE +.PP +\fBnodate\fR +.RS 4 +Don\'t display the date of the last login\. +.RE +.PP +\fBnoterm\fR +.RS 4 +Don\'t display the terminal name on which the last login was attempted\. +.RE +.PP +\fBnohost\fR +.RS 4 +Don\'t indicate from which host the last login was attempted\. +.RE +.PP +\fBnowtmp\fR +.RS 4 +Don\'t update the wtmp entry\. +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +Only the +\fBsession\fR +service is supported\. +.SH "RETURN VALUES" +.PP +.PP +PAM_SUCCESS +.RS 4 +Everything was successfull\. +.RE +.PP +PAM_SERVICE_ERR +.RS 4 +Internal service module error\. +.RE +.PP +PAM_USER_UNKNOWN +.RS 4 +User not known\. +.RE +.SH "EXAMPLES" +.PP +Add the following line to +\fI/etc/pam\.d/login\fR +to display the last login time of an user: +.sp +.RS 4 +.nf + session required pam_lastlog\.so nowtmp + +.fi +.RE +.SH "FILES" +.PP +\fI/var/log/lastlog\fR +.RS 4 +Lastlog logging file +.RE +.SH "SEE ALSO" +.PP + +\fBpam.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_lastlog was written by Andrew G\. Morgan <morgan@kernel\.org>\. diff --git a/modules/pam_lastlog/pam_lastlog.8.xml b/modules/pam_lastlog/pam_lastlog.8.xml new file mode 100644 index 00000000..066eff58 --- /dev/null +++ b/modules/pam_lastlog/pam_lastlog.8.xml @@ -0,0 +1,231 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_lastlog"> + + <refmeta> + <refentrytitle>pam_lastlog</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_lastlog-name"> + <refname>pam_lastlog</refname> + <refpurpose>PAM module to display date of last login</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_lastlog-cmdsynopsis"> + <command>pam_lastlog.so</command> + <arg choice="opt"> + debug + </arg> + <arg choice="opt"> + silent + </arg> + <arg choice="opt"> + never + </arg> + <arg choice="opt"> + nodate + </arg> + <arg choice="opt"> + nohost + </arg> + <arg choice="opt"> + noterm + </arg> + <arg choice="opt"> + nowtmp + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_lastlog-description"> + + <title>DESCRIPTION</title> + + <para> + pam_lastlog is a PAM module to display a line of information + about the last login of the user. In addition, the module maintains + the <filename>/var/log/lastlog</filename> file. + </para> + <para> + Some applications may perform this function themselves. In such + cases, this module is not necessary. + </para> + </refsect1> + + <refsect1 id="pam_lastlog-options"> + + <title>OPTIONS</title> + <variablelist> + <varlistentry> + <term> + <option>debug</option> + </term> + <listitem> + <para> + Print debug information. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>silent</option> + </term> + <listitem> + <para> + Don't inform the user about any previous login, + just upate the <filename>/var/log/lastlog</filename> file. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>never</option> + </term> + <listitem> + <para> + If the <filename>/var/log/lastlog</filename> file does + not contain any old entries for the user, indicate that + the user has never previously logged in with a welcome + message. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>nodate</option> + </term> + <listitem> + <para> + Don't display the date of the last login. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>noterm</option> + </term> + <listitem> + <para> + Don't display the terminal name on which the + last login was attempted. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>nohost</option> + </term> + <listitem> + <para> + Don't indicate from which host the last login was + attempted. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>nowtmp</option> + </term> + <listitem> + <para> + Don't update the wtmp entry. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_lastlog-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + Only the <option>session</option> service is supported. + </para> + </refsect1> + + <refsect1 id='pam_lastlog-return_values'> + <title>RETURN VALUES</title> + <para> + <variablelist> + + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + Everything was successfull. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_SERVICE_ERR</term> + <listitem> + <para> + Internal service module error. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_USER_UNKNOWN</term> + <listitem> + <para> + User not known. + </para> + </listitem> + </varlistentry> + + </variablelist> + </para> + </refsect1> + + <refsect1 id='pam_lastlog-examples'> + <title>EXAMPLES</title> + <para> + Add the following line to <filename>/etc/pam.d/login</filename> to + display the last login time of an user: + </para> + <programlisting> + session required pam_lastlog.so nowtmp + </programlisting> + </refsect1> + + <refsect1 id="pam_lastlog-files"> + <title>FILES</title> + <variablelist> + <varlistentry> + <term><filename>/var/log/lastlog</filename></term> + <listitem> + <para>Lastlog logging file</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id='pam_lastlog-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_lastlog-author'> + <title>AUTHOR</title> + <para> + pam_lastlog was written by Andrew G. Morgan <morgan@kernel.org>. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_lastlog/pam_lastlog.c b/modules/pam_lastlog/pam_lastlog.c new file mode 100644 index 00000000..a75e1ce7 --- /dev/null +++ b/modules/pam_lastlog/pam_lastlog.c @@ -0,0 +1,452 @@ +/* pam_lastlog module */ + +/* + * Written by Andrew Morgan <morgan@linux.kernel.org> 1996/3/11 + * + * This module does the necessary work to display the last login + * time+date for this user, it then updates this entry for the + * present (login) service. + */ + +#include "config.h" + +#include <fcntl.h> +#include <time.h> +#include <errno.h> +#ifdef HAVE_UTMP_H +# include <utmp.h> +#else +# include <lastlog.h> +#endif +#include <pwd.h> +#include <stdlib.h> +#include <stdarg.h> +#include <stdio.h> +#include <string.h> +#include <sys/types.h> +#include <syslog.h> +#include <unistd.h> + +#if defined(hpux) || defined(sunos) || defined(solaris) +# ifndef _PATH_LASTLOG +# define _PATH_LASTLOG "/usr/adm/lastlog" +# endif /* _PATH_LASTLOG */ +# ifndef UT_HOSTSIZE +# define UT_HOSTSIZE 16 +# endif /* UT_HOSTSIZE */ +# ifndef UT_LINESIZE +# define UT_LINESIZE 12 +# endif /* UT_LINESIZE */ +#endif +#if defined(hpux) +struct lastlog { + time_t ll_time; + char ll_line[UT_LINESIZE]; + char ll_host[UT_HOSTSIZE]; /* same as in utmp */ +}; +#endif /* hpux */ + +/* XXX - time before ignoring lock. Is 1 sec enough? */ +#define LASTLOG_IGNORE_LOCK_TIME 1 + +#define DEFAULT_HOST "" /* "[no.where]" */ +#define DEFAULT_TERM "" /* "tt???" */ + +/* + * here, we make a definition for the externally accessible function + * in this file (this definition is required for static a module + * but strongly encouraged generally) it is used to instruct the + * modules include file to define the function prototypes. + */ + +#define PAM_SM_SESSION + +#include <security/pam_modules.h> +#include <security/_pam_macros.h> +#include <security/pam_modutil.h> +#include <security/pam_ext.h> + +/* argument parsing */ + +#define LASTLOG_DATE 01 /* display the date of the last login */ +#define LASTLOG_HOST 02 /* display the last host used (if set) */ +#define LASTLOG_LINE 04 /* display the last terminal used */ +#define LASTLOG_NEVER 010 /* display a welcome message for first login */ +#define LASTLOG_DEBUG 020 /* send info to syslog(3) */ +#define LASTLOG_QUIET 040 /* keep quiet about things */ +#define LASTLOG_WTMP 0100 /* log to wtmp as well as lastlog */ + +static int +_pam_parse(pam_handle_t *pamh, int flags, int argc, const char **argv) +{ + int ctrl=(LASTLOG_DATE|LASTLOG_HOST|LASTLOG_LINE|LASTLOG_WTMP); + + /* does the appliction require quiet? */ + if (flags & PAM_SILENT) { + ctrl |= LASTLOG_QUIET; + } + + /* step through arguments */ + for (; argc-- > 0; ++argv) { + + /* generic options */ + + if (!strcmp(*argv,"debug")) { + ctrl |= LASTLOG_DEBUG; + } else if (!strcmp(*argv,"nodate")) { + ctrl &= ~LASTLOG_DATE; + } else if (!strcmp(*argv,"noterm")) { + ctrl &= ~LASTLOG_LINE; + } else if (!strcmp(*argv,"nohost")) { + ctrl &= ~LASTLOG_HOST; + } else if (!strcmp(*argv,"silent")) { + ctrl |= LASTLOG_QUIET; + } else if (!strcmp(*argv,"never")) { + ctrl |= LASTLOG_NEVER; + } else if (!strcmp(*argv,"nowtmp")) { + ctrl &= ~LASTLOG_WTMP; + } else { + pam_syslog(pamh, LOG_ERR, "unknown option: %s", *argv); + } + } + + D(("ctrl = %o", ctrl)); + return ctrl; +} + +static const char * +get_tty(pam_handle_t *pamh) +{ + const void *void_terminal_line = NULL; + const char *terminal_line; + + if (pam_get_item(pamh, PAM_TTY, &void_terminal_line) != PAM_SUCCESS + || void_terminal_line == NULL) { + terminal_line = DEFAULT_TERM; + } else { + terminal_line = void_terminal_line; + } + if (!strncmp("/dev/", terminal_line, 5)) { + /* strip leading "/dev/" from tty. */ + terminal_line += 5; + } + D(("terminal = %s", terminal_line)); + return terminal_line; +} + +static int +last_login_read(pam_handle_t *pamh, int announce, int last_fd, uid_t uid) +{ + struct flock last_lock; + struct lastlog last_login; + int retval = PAM_SUCCESS; + char the_time[256]; + char *date = NULL; + char *host = NULL; + char *line = NULL; + + memset(&last_lock, 0, sizeof(last_lock)); + last_lock.l_type = F_RDLCK; + last_lock.l_whence = SEEK_SET; + last_lock.l_start = sizeof(last_login) * (off_t) uid; + last_lock.l_len = sizeof(last_login); + + if (fcntl(last_fd, F_SETLK, &last_lock) < 0) { + D(("locking %s failed..(waiting a little)", _PATH_LASTLOG)); + pam_syslog(pamh, LOG_WARNING, + "file %s is locked/read", _PATH_LASTLOG); + sleep(LASTLOG_IGNORE_LOCK_TIME); + } + + if (pam_modutil_read(last_fd, (char *) &last_login, + sizeof(last_login)) != sizeof(last_login)) { + memset(&last_login, 0, sizeof(last_login)); + } + + last_lock.l_type = F_UNLCK; + (void) fcntl(last_fd, F_SETLK, &last_lock); /* unlock */ + + if (!last_login.ll_time) { + if (announce & LASTLOG_DEBUG) { + pam_syslog(pamh, LOG_DEBUG, + "first login for user with uid %lu", + (unsigned long int)uid); + } + } + + if (!(announce & LASTLOG_QUIET)) { + + if (last_login.ll_time) { + + /* we want the date? */ + if (announce & LASTLOG_DATE) { + struct tm *tm, tm_buf; + time_t ll_time; + + ll_time = last_login.ll_time; + tm = localtime_r (&ll_time, &tm_buf); + strftime (the_time, sizeof (the_time), + /* TRANSLATORS: "strftime options for date of last login" */ + _(" %a %b %e %H:%M:%S %Z %Y"), tm); + + date = the_time; + } + + /* we want & have the host? */ + if ((announce & LASTLOG_HOST) + && (last_login.ll_host[0] != '\0')) { + /* TRANSLATORS: " from <host>" */ + if (asprintf(&host, _(" from %.*s"), UT_HOSTSIZE, + last_login.ll_host) < 0) { + pam_syslog(pamh, LOG_ERR, "out of memory"); + retval = PAM_BUF_ERR; + goto cleanup; + } + } + + /* we want and have the terminal? */ + if ((announce & LASTLOG_LINE) + && (last_login.ll_line[0] != '\0')) { + /* TRANSLATORS: " on <terminal>" */ + if (asprintf(&line, _(" on %.*s"), UT_LINESIZE, + last_login.ll_line) < 0) { + pam_syslog(pamh, LOG_ERR, "out of memory"); + retval = PAM_BUF_ERR; + goto cleanup; + } + } + + /* TRANSLATORS: "Last login: <date> from <host> on <terminal>" */ + retval = pam_info(pamh, _("Last login:%s%s%s"), + date ? date : "", + host ? host : "", + line ? line : ""); + } else if (announce & LASTLOG_NEVER) { + D(("this is the first time this user has logged in")); + retval = pam_info(pamh, "%s", _("Welcome to your new account!")); + } + } + + /* cleanup */ + cleanup: + memset(&last_login, 0, sizeof(last_login)); + _pam_overwrite(date); + _pam_overwrite(host); + _pam_drop(host); + _pam_overwrite(line); + _pam_drop(line); + + return retval; +} + +static int +last_login_write(pam_handle_t *pamh, int announce, int last_fd, + uid_t uid, const char *user) +{ + struct flock last_lock; + struct lastlog last_login; + time_t ll_time; + const void *void_remote_host = NULL; + const char *remote_host; + const char *terminal_line; + int retval = PAM_SUCCESS; + + /* rewind */ + if (lseek(last_fd, sizeof(last_login) * (off_t) uid, SEEK_SET) < 0) { + pam_syslog(pamh, LOG_ERR, "failed to lseek %s: %m", _PATH_LASTLOG); + return PAM_SERVICE_ERR; + } + + /* set this login date */ + D(("set the most recent login time")); + (void) time(&ll_time); /* set the time */ + last_login.ll_time = ll_time; + + /* set the remote host */ + if (pam_get_item(pamh, PAM_RHOST, &void_remote_host) != PAM_SUCCESS + || void_remote_host == NULL) { + remote_host = DEFAULT_HOST; + } else { + remote_host = void_remote_host; + } + + /* copy to last_login */ + last_login.ll_host[0] = '\0'; + strncat(last_login.ll_host, remote_host, sizeof(last_login.ll_host)-1); + + /* set the terminal line */ + terminal_line = get_tty(pamh); + + /* copy to last_login */ + last_login.ll_line[0] = '\0'; + strncat(last_login.ll_line, terminal_line, sizeof(last_login.ll_line)-1); + terminal_line = NULL; + + D(("locking lastlog file")); + + /* now we try to lock this file-record exclusively; non-blocking */ + memset(&last_lock, 0, sizeof(last_lock)); + last_lock.l_type = F_WRLCK; + last_lock.l_whence = SEEK_SET; + last_lock.l_start = sizeof(last_login) * (off_t) uid; + last_lock.l_len = sizeof(last_login); + + if (fcntl(last_fd, F_SETLK, &last_lock) < 0) { + D(("locking %s failed..(waiting a little)", _PATH_LASTLOG)); + pam_syslog(pamh, LOG_WARNING, "file %s is locked/write", _PATH_LASTLOG); + sleep(LASTLOG_IGNORE_LOCK_TIME); + } + + D(("writing to the lastlog file")); + if (pam_modutil_write (last_fd, (char *) &last_login, + sizeof (last_login)) != sizeof(last_login)) { + pam_syslog(pamh, LOG_ERR, "failed to write %s: %m", _PATH_LASTLOG); + retval = PAM_SERVICE_ERR; + } + + last_lock.l_type = F_UNLCK; + (void) fcntl(last_fd, F_SETLK, &last_lock); /* unlock */ + D(("unlocked")); + + if (announce & LASTLOG_WTMP) { + /* write wtmp entry for user */ + logwtmp(last_login.ll_line, user, remote_host); + } + + /* cleanup */ + memset(&last_login, 0, sizeof(last_login)); + + return retval; +} + +static int +last_login_date(pam_handle_t *pamh, int announce, uid_t uid, const char *user) +{ + int retval; + int last_fd; + + /* obtain the last login date and all the relevant info */ + last_fd = open(_PATH_LASTLOG, O_RDWR); + if (last_fd < 0) { + if (errno == ENOENT) { + last_fd = open(_PATH_LASTLOG, O_RDWR|O_CREAT, + S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH); + if (last_fd < 0) { + pam_syslog(pamh, LOG_ERR, + "unable to create %s: %m", _PATH_LASTLOG); + D(("unable to create %s file", _PATH_LASTLOG)); + return PAM_SERVICE_ERR; + } + pam_syslog(pamh, LOG_WARNING, + "file %s created", _PATH_LASTLOG); + D(("file %s created", _PATH_LASTLOG)); + } else { + pam_syslog(pamh, LOG_ERR, "unable to open %s: %m", _PATH_LASTLOG); + D(("unable to open %s file", _PATH_LASTLOG)); + return PAM_SERVICE_ERR; + } + } + + if (lseek(last_fd, sizeof(struct lastlog) * (off_t) uid, SEEK_SET) < 0) { + pam_syslog(pamh, LOG_ERR, "failed to lseek %s: %m", _PATH_LASTLOG); + D(("unable to lseek %s file", _PATH_LASTLOG)); + return PAM_SERVICE_ERR; + } + + retval = last_login_read(pamh, announce, last_fd, uid); + if (retval != PAM_SUCCESS) + { + close(last_fd); + D(("error while reading lastlog file")); + return retval; + } + + retval = last_login_write(pamh, announce, last_fd, uid, user); + + close(last_fd); + D(("all done with last login")); + + return retval; +} + +/* --- authentication management functions (only) --- */ + +PAM_EXTERN int +pam_sm_open_session(pam_handle_t *pamh, int flags, + int argc, const char **argv) +{ + int retval, ctrl; + const void *user; + const struct passwd *pwd; + uid_t uid; + + /* + * this module gets the uid of the PAM_USER. Uses it to display + * last login info and then updates the lastlog for that user. + */ + + ctrl = _pam_parse(pamh, flags, argc, argv); + + /* which user? */ + + retval = pam_get_item(pamh, PAM_USER, &user); + if (retval != PAM_SUCCESS || user == NULL || *(const char *)user == '\0') { + pam_syslog(pamh, LOG_NOTICE, "user unknown"); + return PAM_USER_UNKNOWN; + } + + /* what uid? */ + + pwd = pam_modutil_getpwnam (pamh, user); + if (pwd == NULL) { + D(("couldn't identify user %s", user)); + return PAM_USER_UNKNOWN; + } + uid = pwd->pw_uid; + pwd = NULL; /* tidy up */ + + /* process the current login attempt (indicate last) */ + + retval = last_login_date(pamh, ctrl, uid, user); + + /* indicate success or failure */ + + uid = -1; /* forget this */ + + return retval; +} + +PAM_EXTERN int +pam_sm_close_session (pam_handle_t *pamh, int flags, + int argc, const char **argv) +{ + const char *terminal_line; + + if (!(_pam_parse(pamh, flags, argc, argv) & LASTLOG_WTMP)) + return PAM_SUCCESS; + + terminal_line = get_tty(pamh); + + /* Wipe out utmp logout entry */ + logwtmp(terminal_line, "", ""); + + return PAM_SUCCESS; +} + +#ifdef PAM_STATIC + +/* static module data */ + +struct pam_module _pam_lastlog_modstruct = { + "pam_lastlog", + NULL, + NULL, + NULL, + pam_sm_open_session, + pam_sm_close_session, + NULL, +}; + +#endif + +/* end of module definition */ diff --git a/modules/pam_lastlog/tst-pam_lastlog b/modules/pam_lastlog/tst-pam_lastlog new file mode 100755 index 00000000..ea9a5eb0 --- /dev/null +++ b/modules/pam_lastlog/tst-pam_lastlog @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_lastlog.so diff --git a/modules/pam_limits/Makefile.am b/modules/pam_limits/Makefile.am new file mode 100644 index 00000000..13232ea6 --- /dev/null +++ b/modules/pam_limits/Makefile.am @@ -0,0 +1,38 @@ +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README $(MANS) $(XMLS) limits.conf tst-pam_limits + +man_MANS = limits.conf.5 pam_limits.8 +XMLS = README.xml limits.conf.5.xml pam_limits.8.xml + +TESTS = tst-pam_limits + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) +limits_conf_dir = $(SCONFIGDIR)/limits.d + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include \ + -DLIMITS_FILE_DIR=\"$(limits_conf_dir)/*.conf\" \ + -DLIMITS_FILE=\"$(SCONFIGDIR)/limits.conf\" +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_limits.la +pam_limits_la_LIBADD = -L$(top_builddir)/libpam -lpam + +secureconf_DATA = limits.conf + +if ENABLE_REGENERATE_MAN +noinst_DATA = README +README: pam_limits.8.xml limits.conf.5.xml +-include $(top_srcdir)/Make.xml.rules +endif + +install-data-local: + mkdir -p $(DESTDIR)$(limits_conf_dir) diff --git a/modules/pam_limits/Makefile.in b/modules/pam_limits/Makefile.in new file mode 100644 index 00000000..97f38f65 --- /dev/null +++ b/modules/pam_limits/Makefile.in @@ -0,0 +1,744 @@ +# Makefile.in generated by automake 1.10.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY, to the extent permitted by law; without +# even the implied warranty of MERCHANTABILITY or FITNESS FOR A +# PARTICULAR PURPOSE. + +@SET_MAKE@ + +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + + +VPATH = @srcdir@ +pkgdatadir = $(datadir)/@PACKAGE@ +pkglibdir = $(libdir)/@PACKAGE@ +pkgincludedir = $(includedir)/@PACKAGE@ +am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd +install_sh_DATA = 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$(top_srcdir)/Make.xml.rules + +install-data-local: + mkdir -p $(DESTDIR)$(limits_conf_dir) +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_limits/README b/modules/pam_limits/README new file mode 100644 index 00000000..3c59052a --- /dev/null +++ b/modules/pam_limits/README @@ -0,0 +1,64 @@ +pam_limits — PAM module to limit resources + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +The pam_limits PAM module sets limits on the system resources that can be +obtained in a user-session. Users of uid=0 are affected by this limits, too. + +By default limits are taken from the /etc/security/limits.conf config file. +Then individual files from the /etc/security/limits.d/ directory are read. The +files are parsed one after another in the order of "C" locale. The effect of +the individual files is the same as if all the files were concatenated together +in the order of parsing. If a config file is explicitely specified with a +module option then the files in the above directory are not parsed. + +The module must not be called by a multithreaded application. + +If Linux PAM is compiled with audit support the module will report when it +denies access based on limit of maximum number of concurrent login sessions. + +OPTIONS + +change_uid + + Change real uid to the user for who the limits are set up. Use this option + if you have problems like login not forking a shell for user who has no + processes. Be warned that something else may break when you do this. + +conf=/path/to/limits.conf + + Indicate an alternative limits.conf style configuration file to override + the default. + +debug + + Print debug information. + +utmp_early + + Some broken applications actually allocate a utmp entry for the user before + the user is admitted to the system. If some of the services you are + configuring PAM for do this, you can selectively use this module argument + to compensate for this behavior and at the same time maintain system-wide + consistency with a single limits.conf file. + +noaudit + + Do not report exceeded maximum logins count to the audit subsystem. + +EXAMPLES + +These are some example lines which might be specified in /etc/security/ +limits.conf. + +* soft core 0 +* hard rss 10000 +@student hard nproc 20 +@faculty soft nproc 20 +@faculty hard nproc 50 +ftp hard nproc 0 +@student - maxlogins 4 + + diff --git a/modules/pam_limits/README.xml b/modules/pam_limits/README.xml new file mode 100644 index 00000000..964a5a21 --- /dev/null +++ b/modules/pam_limits/README.xml @@ -0,0 +1,39 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamlimits SYSTEM "pam_limits.8.xml"> +--> +<!-- +<!ENTITY limitsconf SYSTEM "limits.conf.5.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_limits.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_limits-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_limits.8.xml" xpointer='xpointer(//refsect1[@id = "pam_limits-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_limits.8.xml" xpointer='xpointer(//refsect1[@id = "pam_limits-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="limits.conf.5.xml" xpointer='xpointer(//refsect1[@id = "limits.conf-examples"]/*)'/> + </section> + +</article> diff --git a/modules/pam_limits/limits.conf b/modules/pam_limits/limits.conf new file mode 100644 index 00000000..5d5c3f70 --- /dev/null +++ b/modules/pam_limits/limits.conf @@ -0,0 +1,50 @@ +# /etc/security/limits.conf +# +#Each line describes a limit for a user in the form: +# +#<domain> <type> <item> <value> +# +#Where: +#<domain> can be: +# - an user name +# - a group name, with @group syntax +# - the wildcard *, for default entry +# - the wildcard %, can be also used with %group syntax, +# for maxlogin limit +# +#<type> can have the two values: +# - "soft" for enforcing the soft limits +# - "hard" for enforcing hard limits +# +#<item> can be one of the following: +# - core - limits the core file size (KB) +# - data - max data size (KB) +# - fsize - maximum filesize (KB) +# - memlock - max locked-in-memory address space (KB) +# - nofile - max number of open files +# - rss - max resident set size (KB) +# - stack - max stack size (KB) +# - cpu - max CPU time (MIN) +# - nproc - max number of processes +# - as - address space limit (KB) +# - maxlogins - max number of logins for this user +# - maxsyslogins - max number of logins on the system +# - priority - the priority to run user process with +# - locks - max number of file locks the user can hold +# - sigpending - max number of pending signals +# - msgqueue - max memory used by POSIX message queues (bytes) +# - nice - max nice priority allowed to raise to values: [-20, 19] +# - rtprio - max realtime priority +# +#<domain> <type> <item> <value> +# + +#* soft core 0 +#* hard rss 10000 +#@student hard nproc 20 +#@faculty soft nproc 20 +#@faculty hard nproc 50 +#ftp hard nproc 0 +#@student - maxlogins 4 + +# End of file diff --git a/modules/pam_limits/limits.conf.5 b/modules/pam_limits/limits.conf.5 new file mode 100644 index 00000000..0aba7137 --- /dev/null +++ b/modules/pam_limits/limits.conf.5 @@ -0,0 +1,219 @@ +.\" Title: limits.conf +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "LIMITS\.CONF" "5" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +limits.conf - configuration file for the pam_limits module +.SH "DESCRIPTION" +.PP +The syntax of the lines is as follows: +.PP + +\fI<domain>\fR +\fI<type>\fR +\fI<item>\fR +\fI<value>\fR +.PP +The fields listed above should be filled as follows: +.PP +\fB<domain>\fR +.RS 4 +.sp +.RS 4 +\h'-04'\(bu\h'+03'a username +.RE +.sp +.RS 4 +\h'-04'\(bu\h'+03'a groupname, with +\fB@group\fR +syntax\. This should not be confused with netgroups\. +.RE +.sp +.RS 4 +\h'-04'\(bu\h'+03'the wildcard +\fB*\fR, for default entry\. +.RE +.sp +.RS 4 +\h'-04'\(bu\h'+03'the wildcard +\fB%\fR, for maxlogins limit only, can also be used with +\fI%group\fR +syntax\. +.RE +.RE +.PP +\fB<type>\fR +.RS 4 +.PP +\fBhard\fR +.RS 4 +for enforcing +\fBhard\fR +resource limits\. These limits are set by the superuser and enforced by the Kernel\. The user cannot raise his requirement of system resources above such values\. +.RE +.PP +\fBsoft\fR +.RS 4 +for enforcing +\fBsoft\fR +resource limits\. These limits are ones that the user can move up or down within the permitted range by any pre\-existing +\fBhard\fR +limits\. The values specified with this token can be thought of as +\fIdefault\fR +values, for normal system usage\. +.RE +.PP +\fB\-\fR +.RS 4 +for enforcing both +\fBsoft\fR +and +\fBhard\fR +resource limits together\. +.sp +Note, if you specify a type of \'\-\' but neglect to supply the item and value fields then the module will never enforce any limits on the specified user/group etc\. \. +.RE +.RE +.PP +\fB<item>\fR +.RS 4 +.PP +\fBcore\fR +.RS 4 +limits the core file size (KB) +.RE +.PP +\fBdata\fR +.RS 4 +maximum data size (KB) +.RE +.PP +\fBfsize\fR +.RS 4 +maximum filesize (KB) +.RE +.PP +\fBmemlock\fR +.RS 4 +maximum locked\-in\-memory address space (KB) +.RE +.PP +\fBnofile\fR +.RS 4 +maximum number of open files +.RE +.PP +\fBrss\fR +.RS 4 +maximum resident set size (KB) +.RE +.PP +\fBstack\fR +.RS 4 +maximum stack size (KB) +.RE +.PP +\fBcpu\fR +.RS 4 +maximum CPU time (minutes) +.RE +.PP +\fBnproc\fR +.RS 4 +maximum number of processes +.RE +.PP +\fBas\fR +.RS 4 +address space limit (KB) +.RE +.PP +\fBmaxlogins\fR +.RS 4 +maximum number of logins for this user except for this with +\fIuid=0\fR +.RE +.PP +\fBmaxsyslogins\fR +.RS 4 +maximum number of logins on system +.RE +.PP +\fBpriority\fR +.RS 4 +the priority to run user process with (negative values boost process priority) +.RE +.PP +\fBlocks\fR +.RS 4 +maximum locked files (Linux 2\.4 and higher) +.RE +.PP +\fBsigpending\fR +.RS 4 +maximum number of pending signals (Linux 2\.6 and higher) +.RE +.PP +\fBmsqqueue\fR +.RS 4 +maximum memory used by POSIX message queues (bytes) (Linux 2\.6 and higher) +.RE +.PP +\fBnice\fR +.RS 4 +maximum nice priority allowed to raise to (Linux 2\.6\.12 and higher) values: [\-20,19] +.RE +.PP +\fBrtprio\fR +.RS 4 +maximum realtime priority allowed for non\-privileged processes (Linux 2\.6\.12 and higher) +.RE +.RE +.PP +In general, individual limits have priority over group limits, so if you impose no limits for +\fIadmin\fR +group, but one of the members in this group have a limits line, the user will have its limits set according to this line\. +.PP +Also, please note that all limit settings are set +\fIper login\fR\. They are not global, nor are they permanent; existing only for the duration of the session\. +.PP +In the +\fIlimits\fR +configuration file, the \'\fB#\fR\' character introduces a comment \- after which the rest of the line is ignored\. +.PP +The pam_limits module does its best to report configuration problems found in its configuration file via +\fBsyslog\fR(3)\. +.SH "EXAMPLES" +.PP +These are some example lines which might be specified in +\fI/etc/security/limits\.conf\fR\. +.sp +.RS 4 +.nf +* soft core 0 +* hard rss 10000 +@student hard nproc 20 +@faculty soft nproc 20 +@faculty hard nproc 50 +ftp hard nproc 0 +@student \- maxlogins 4 + +.fi +.RE +.SH "SEE ALSO" +.PP + +\fBpam_limits\fR(8), +\fBpam.d\fR(5), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_limits was initially written by Cristian Gafton <gafton@redhat\.com> diff --git a/modules/pam_limits/limits.conf.5.xml b/modules/pam_limits/limits.conf.5.xml new file mode 100644 index 00000000..fb1fad27 --- /dev/null +++ b/modules/pam_limits/limits.conf.5.xml @@ -0,0 +1,287 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="limits.conf"> + + <refmeta> + <refentrytitle>limits.conf</refentrytitle> + <manvolnum>5</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv> + <refname>limits.conf</refname> + <refpurpose>configuration file for the pam_limits module</refpurpose> + </refnamediv> + + <refsect1 id='limits.conf-description'> + <title>DESCRIPTION</title> + <para> + The syntax of the lines is as follows: + </para> + <para> + <replaceable><domain></replaceable> <replaceable><type></replaceable> + <replaceable><item></replaceable> <replaceable><value></replaceable> + </para> + <para> + The fields listed above should be filled as follows: + </para> + <variablelist> + <varlistentry> + <term> + <option><domain></option> + </term> + <listitem> + <itemizedlist> + <listitem> + <para> + a username + </para> + </listitem> + <listitem> + <para> + a groupname, with <emphasis remap='B'>@group</emphasis> syntax. + This should not be confused with netgroups. + </para> + </listitem> + <listitem> + <para> + the wildcard <emphasis remap='B'>*</emphasis>, for default entry. + </para> + </listitem> + <listitem> + <para> + the wildcard <emphasis remap='B'>%</emphasis>, for maxlogins limit only, + can also be used with <emphasis remap='b'>%group</emphasis> syntax. + </para> + </listitem> + </itemizedlist> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option><type></option> + </term> + <listitem> + <variablelist> + <varlistentry> + <term><option>hard</option></term> + <listitem> + <para> + for enforcing <emphasis remap='B'>hard</emphasis> resource limits. + These limits are set by the superuser and enforced by the Kernel. + The user cannot raise his requirement of system resources above such values. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>soft</option></term> + <listitem> + <para> + for enforcing <emphasis remap='B'>soft</emphasis> resource limits. + These limits are ones that the user can move up or down within the + permitted range by any pre-existing <emphasis remap='B'>hard</emphasis> + limits. The values specified with this token can be thought of as + <emphasis>default</emphasis> values, for normal system usage. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>-</option></term> + <listitem> + <para> + for enforcing both <emphasis remap='B'>soft</emphasis> and + <emphasis remap='B'>hard</emphasis> resource limits together. + </para> + <para> + Note, if you specify a type of '-' but neglect to supply the + item and value fields then the module will never enforce any + limits on the specified user/group etc. . + </para> + </listitem> + </varlistentry> + </variablelist> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option><item></option> + </term> + <listitem> + <variablelist> + <varlistentry> + <term><option>core</option></term> + <listitem> + <para>limits the core file size (KB)</para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>data</option></term> + <listitem> + <para>maximum data size (KB)</para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>fsize</option></term> + <listitem> + <para>maximum filesize (KB)</para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>memlock</option></term> + <listitem> + <para>maximum locked-in-memory address space (KB)</para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>nofile</option></term> + <listitem> + <para>maximum number of open files</para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>rss</option></term> + <listitem> + <para>maximum resident set size (KB)</para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>stack</option></term> + <listitem> + <para>maximum stack size (KB)</para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>cpu</option></term> + <listitem> + <para>maximum CPU time (minutes)</para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>nproc</option></term> + <listitem> + <para>maximum number of processes</para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>as</option></term> + <listitem> + <para>address space limit (KB)</para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>maxlogins</option></term> + <listitem> + <para>maximum number of logins for this user except + for this with <emphasis>uid=0</emphasis></para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>maxsyslogins</option></term> + <listitem> + <para>maximum number of logins on system</para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>priority</option></term> + <listitem> + <para>the priority to run user process with (negative + values boost process priority)</para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>locks</option></term> + <listitem> + <para>maximum locked files (Linux 2.4 and higher)</para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>sigpending</option></term> + <listitem> + <para>maximum number of pending signals (Linux 2.6 and higher)</para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>msqqueue</option></term> + <listitem> + <para>maximum memory used by POSIX message queues (bytes) + (Linux 2.6 and higher)</para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>nice</option></term> + <listitem> + <para>maximum nice priority allowed to raise to (Linux 2.6.12 and higher) values: [-20,19]</para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>rtprio</option></term> + <listitem> + <para>maximum realtime priority allowed for non-privileged processes + (Linux 2.6.12 and higher)</para> + </listitem> + </varlistentry> + </variablelist> + </listitem> + </varlistentry> + + </variablelist> + <para> + In general, individual limits have priority over group limits, so if + you impose no limits for <emphasis>admin</emphasis> group, but one of + the members in this group have a limits line, the user will have its + limits set according to this line. + </para> + <para> + Also, please note that all limit settings are set + <emphasis>per login</emphasis>. They are not global, nor are they + permanent; existing only for the duration of the session. + </para> + <para> + In the <emphasis>limits</emphasis> configuration file, the + '<emphasis remap='B'>#</emphasis>' character introduces a comment + - after which the rest of the line is ignored. + </para> + <para> + The pam_limits module does its best to report configuration problems + found in its configuration file via <citerefentry> + <refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum></citerefentry>. + </para> + </refsect1> + + <refsect1 id="limits.conf-examples"> + <title>EXAMPLES</title> + <para> + These are some example lines which might be specified in + <filename>/etc/security/limits.conf</filename>. + </para> + <programlisting> +* soft core 0 +* hard rss 10000 +@student hard nproc 20 +@faculty soft nproc 20 +@faculty hard nproc 50 +ftp hard nproc 0 +@student - maxlogins 4 + </programlisting> + </refsect1> + + <refsect1 id="limits.conf-see_also"> + <title>SEE ALSO</title> + <para> + <citerefentry><refentrytitle>pam_limits</refentrytitle><manvolnum>8</manvolnum></citerefentry>, + <citerefentry><refentrytitle>pam.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum></citerefentry> + </para> + </refsect1> + + <refsect1 id="limits.conf-author"> + <title>AUTHOR</title> + <para> + pam_limits was initially written by Cristian Gafton <gafton@redhat.com> + </para> + </refsect1> +</refentry> diff --git a/modules/pam_limits/pam_limits.8 b/modules/pam_limits/pam_limits.8 new file mode 100644 index 00000000..8ffe28e4 --- /dev/null +++ b/modules/pam_limits/pam_limits.8 @@ -0,0 +1,132 @@ +.\" Title: pam_limits +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_LIMITS" "8" "04/16/2008" "Linux-PAM Manual" "Linux-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_limits - PAM module to limit resources +.SH "SYNOPSIS" +.HP 14 +\fBpam_limits\.so\fR [change_uid] [conf=\fI/path/to/limits\.conf\fR] [debug] [utmp_early] [noaudit] +.SH "DESCRIPTION" +.PP +The pam_limits PAM module sets limits on the system resources that can be obtained in a user\-session\. Users of +\fIuid=0\fR +are affected by this limits, too\. +.PP +By default limits are taken from the +\fI/etc/security/limits\.conf\fR +config file\. Then individual files from the +\fI/etc/security/limits\.d/\fR +directory are read\. The files are parsed one after another in the order of "C" locale\. The effect of the individual files is the same as if all the files were concatenated together in the order of parsing\. If a config file is explicitely specified with a module option then the files in the above directory are not parsed\. +.PP +The module must not be called by a multithreaded application\. +.PP +If Linux PAM is compiled with audit support the module will report when it denies access based on limit of maximum number of concurrent login sessions\. +.SH "OPTIONS" +.PP +\fBchange_uid\fR +.RS 4 +Change real uid to the user for who the limits are set up\. Use this option if you have problems like login not forking a shell for user who has no processes\. Be warned that something else may break when you do this\. +.RE +.PP +\fBconf=\fR\fB\fI/path/to/limits\.conf\fR\fR +.RS 4 +Indicate an alternative limits\.conf style configuration file to override the default\. +.RE +.PP +\fBdebug\fR +.RS 4 +Print debug information\. +.RE +.PP +\fButmp_early\fR +.RS 4 +Some broken applications actually allocate a utmp entry for the user before the user is admitted to the system\. If some of the services you are configuring PAM for do this, you can selectively use this module argument to compensate for this behavior and at the same time maintain system\-wide consistency with a single limits\.conf file\. +.RE +.PP +\fBnoaudit\fR +.RS 4 +Do not report exceeded maximum logins count to the audit subsystem\. +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +Only the +\fBsession\fR +service is supported\. +.SH "RETURN VALUES" +.PP +PAM_ABORT +.RS 4 +Cannot get current limits\. +.RE +.PP +PAM_IGNORE +.RS 4 +No limits found for this user\. +.RE +.PP +PAM_PERM_DENIED +.RS 4 +New limits could not be set\. +.RE +.PP +PAM_SERVICE_ERR +.RS 4 +Cannot read config file\. +.RE +.PP +PAM_SESSEION_ERR +.RS 4 +Error recovering account name\. +.RE +.PP +PAM_SUCCESS +.RS 4 +Limits were changed\. +.RE +.PP +PAM_USER_UNKNOWN +.RS 4 +The user is not known to the system\. +.RE +.SH "FILES" +.PP +\fI/etc/security/limits\.conf\fR +.RS 4 +Default configuration file +.RE +.SH "EXAMPLES" +.PP +For the services you need resources limits (login for example) put a the following line in +\fI/etc/pam\.d/login\fR +as the last line for that service (usually after the pam_unix session line): +.sp +.RS 4 +.nf +#%PAM\-1\.0 +# +# Resource limits imposed on login sessions via pam_limits +# +session required pam_limits\.so + +.fi +.RE +.PP +Replace "login" for each service you are using this module\. +.SH "SEE ALSO" +.PP + +\fBlimits.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8)\. +.SH "AUTHORS" +.PP +pam_limits was initially written by Cristian Gafton <gafton@redhat\.com> diff --git a/modules/pam_limits/pam_limits.8.xml b/modules/pam_limits/pam_limits.8.xml new file mode 100644 index 00000000..98afdcd4 --- /dev/null +++ b/modules/pam_limits/pam_limits.8.xml @@ -0,0 +1,256 @@ +<?xml version="1.0" encoding="ISO-8859-1"?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN" + "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd"> + +<refentry id='pam_limits'> + + <refmeta> + <refentrytitle>pam_limits</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class='setdesc'>Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id='pam_limits-name'> + <refname>pam_limits</refname> + <refpurpose> + PAM module to limit resources + </refpurpose> + </refnamediv> + +<!-- body begins here --> + + <refsynopsisdiv> + <cmdsynopsis id="pam_limits-cmdsynopsis"> + <command>pam_limits.so</command> + <arg choice="opt"> + change_uid + </arg> + <arg choice="opt"> + conf=<replaceable>/path/to/limits.conf</replaceable> + </arg> + <arg choice="opt"> + debug + </arg> + <arg choice="opt"> + utmp_early + </arg> + <arg choice="opt"> + noaudit + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + + <refsect1 id="pam_limits-description"> + <title>DESCRIPTION</title> + <para> + The pam_limits PAM module sets limits on the system resources that can be + obtained in a user-session. Users of <emphasis>uid=0</emphasis> are affected + by this limits, too. + </para> + <para> + By default limits are taken from the <filename>/etc/security/limits.conf</filename> + config file. Then individual files from the <filename>/etc/security/limits.d/</filename> + directory are read. The files are parsed one after another in the order of "C" locale. + The effect of the individual files is the same as if all the files were + concatenated together in the order of parsing. + If a config file is explicitely specified with a module option then the + files in the above directory are not parsed. + </para> + <para> + The module must not be called by a multithreaded application. + </para> + <para> + If Linux PAM is compiled with audit support the module will report + when it denies access based on limit of maximum number of concurrent + login sessions. + </para> + </refsect1> + + <refsect1 id="pam_limits-options"> + <title>OPTIONS</title> + <variablelist> + <varlistentry> + <term> + <option>change_uid</option> + </term> + <listitem> + <para> + Change real uid to the user for who the limits are set up. Use this + option if you have problems like login not forking a shell for user + who has no processes. Be warned that something else may break when + you do this. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>conf=<replaceable>/path/to/limits.conf</replaceable></option> + </term> + <listitem> + <para> + Indicate an alternative limits.conf style configuration file to + override the default. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>debug</option> + </term> + <listitem> + <para> + Print debug information. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>utmp_early</option> + </term> + <listitem> + <para> + Some broken applications actually allocate a utmp entry for + the user before the user is admitted to the system. If some + of the services you are configuring PAM for do this, you can + selectively use this module argument to compensate for this + behavior and at the same time maintain system-wide consistency + with a single limits.conf file. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>noaudit</option> + </term> + <listitem> + <para> + Do not report exceeded maximum logins count to the audit subsystem. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_limits-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + Only the <option>session</option> service is supported. + </para> + </refsect1> + + <refsect1 id="pam_limits-return_values"> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_ABORT</term> + <listitem> + <para> + Cannot get current limits. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_IGNORE</term> + <listitem> + <para> + No limits found for this user. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_PERM_DENIED</term> + <listitem> + <para> + New limits could not be set. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_SERVICE_ERR</term> + <listitem> + <para> + Cannot read config file. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_SESSEION_ERR</term> + <listitem> + <para> + Error recovering account name. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + Limits were changed. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_USER_UNKNOWN</term> + <listitem> + <para> + The user is not known to the system. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_limits-files"> + <title>FILES</title> + <variablelist> + <varlistentry> + <term><filename>/etc/security/limits.conf</filename></term> + <listitem> + <para>Default configuration file</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id='pam_limits-examples'> + <title>EXAMPLES</title> + <para> + For the services you need resources limits (login for example) put a + the following line in <filename>/etc/pam.d/login</filename> as the last + line for that service (usually after the pam_unix session line): + </para> + <programlisting> +#%PAM-1.0 +# +# Resource limits imposed on login sessions via pam_limits +# +session required pam_limits.so + </programlisting> + <para> + Replace "login" for each service you are using this module. + </para> + </refsect1> + + <refsect1 id="pam_limits-see_also"> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>limits.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>. + </para> + </refsect1> + + <refsect1 id="pam_limits-authors"> + <title>AUTHORS</title> + <para> + pam_limits was initially written by Cristian Gafton <gafton@redhat.com> + </para> + </refsect1> +</refentry> diff --git a/modules/pam_limits/pam_limits.c b/modules/pam_limits/pam_limits.c new file mode 100644 index 00000000..f1e29b85 --- /dev/null +++ b/modules/pam_limits/pam_limits.c @@ -0,0 +1,777 @@ +/* + * pam_limits - impose resource limits when opening a user session + * + * 1.6 - modified for PLD (added process priority settings) + * by Marcin Korzonek <mkorz@shadow.eu.org> + * 1.5 - Elliot Lee's "max system logins patch" + * 1.4 - addressed bug in configuration file parser + * 1.3 - modified the configuration file format + * 1.2 - added 'debug' and 'conf=' arguments + * 1.1 - added @group support + * 1.0 - initial release - Linux ONLY + * + * See end for Copyright information + */ + +#if !defined(linux) && !defined(__linux) +#warning THIS CODE IS KNOWN TO WORK ONLY ON LINUX !!! +#endif + +#include "config.h" + +#include <stdio.h> +#include <unistd.h> +#include <string.h> +#include <ctype.h> +#include <stdlib.h> +#include <errno.h> +#include <syslog.h> +#include <stdarg.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/resource.h> +#include <limits.h> +#include <glob.h> +#include <utmp.h> +#ifndef UT_USER /* some systems have ut_name instead of ut_user */ +#define UT_USER ut_user +#endif + +#include <grp.h> +#include <pwd.h> +#include <locale.h> + +#ifdef HAVE_LIBAUDIT +#include <libaudit.h> +#endif + +/* Module defines */ +#define LINE_LENGTH 1024 + +#define LIMITS_DEF_USER 0 /* limit was set by an user entry */ +#define LIMITS_DEF_GROUP 1 /* limit was set by a group entry */ +#define LIMITS_DEF_ALLGROUP 2 /* limit was set by a group entry */ +#define LIMITS_DEF_ALL 3 /* limit was set by an default entry */ +#define LIMITS_DEF_DEFAULT 4 /* limit was set by an default entry */ +#define LIMITS_DEF_NONE 5 /* this limit was not set yet */ + +static const char *limits_def_names[] = { + "USER", + "GROUP", + "ALLGROUP", + "ALL", + "DEFAULT", + "NONE", + NULL +}; + +struct user_limits_struct { + int supported; + int src_soft; + int src_hard; + struct rlimit limit; +}; + +/* internal data */ +struct pam_limit_s { + int login_limit; /* the max logins limit */ + int login_limit_def; /* which entry set the login limit */ + int flag_numsyslogins; /* whether to limit logins only for a + specific user or to count all logins */ + int priority; /* the priority to run user process with */ + struct user_limits_struct limits[RLIM_NLIMITS]; + const char *conf_file; + int utmp_after_pam_call; + char login_group[LINE_LENGTH]; +}; + +#define LIMIT_LOGIN RLIM_NLIMITS+1 +#define LIMIT_NUMSYSLOGINS RLIM_NLIMITS+2 + +#define LIMIT_PRI RLIM_NLIMITS+3 + +#define LIMIT_SOFT 1 +#define LIMIT_HARD 2 + +#define PAM_SM_SESSION + +#include <security/pam_modules.h> +#include <security/_pam_macros.h> +#include <security/pam_modutil.h> +#include <security/pam_ext.h> + +/* argument parsing */ + +#define PAM_DEBUG_ARG 0x0001 +#define PAM_DO_SETREUID 0x0002 +#define PAM_UTMP_EARLY 0x0004 +#define PAM_NO_AUDIT 0x0008 + +/* Limits from globbed files. */ +#define LIMITS_CONF_GLOB LIMITS_FILE_DIR + +#define CONF_FILE (pl->conf_file != NULL)?pl->conf_file:LIMITS_FILE + +static int +_pam_parse (const pam_handle_t *pamh, int argc, const char **argv, + struct pam_limit_s *pl) +{ + int ctrl=0; + + /* step through arguments */ + for (ctrl=0; argc-- > 0; ++argv) { + + /* generic options */ + + if (!strcmp(*argv,"debug")) { + ctrl |= PAM_DEBUG_ARG; + } else if (!strncmp(*argv,"conf=",5)) { + pl->conf_file = *argv+5; + } else if (!strncmp(*argv,"change_uid",10)) { + ctrl |= PAM_DO_SETREUID; + } else if (!strcmp(*argv,"utmp_early")) { + ctrl |= PAM_UTMP_EARLY; + } else if (!strcmp(*argv,"noaudit")) { + ctrl |= PAM_NO_AUDIT; + } else { + pam_syslog(pamh, LOG_ERR, "unknown option: %s", *argv); + } + } + + return ctrl; +} + + +#define LIMITED_OK 0 /* limit setting appeared to work */ +#define LIMIT_ERR 1 /* error setting a limit */ +#define LOGIN_ERR 2 /* too many logins err */ + +/* Counts the number of user logins and check against the limit*/ +static int +check_logins (pam_handle_t *pamh, const char *name, int limit, int ctrl, + struct pam_limit_s *pl) +{ + struct utmp *ut; + int count; + + if (ctrl & PAM_DEBUG_ARG) { + pam_syslog(pamh, LOG_DEBUG, + "checking logins for '%s' (maximum of %d)", name, limit); + } + + if (limit < 0) + return 0; /* no limits imposed */ + if (limit == 0) /* maximum 0 logins ? */ { + pam_syslog(pamh, LOG_WARNING, "No logins allowed for '%s'", name); + return LOGIN_ERR; + } + + setutent(); + + /* Because there is no definition about when an application + actually adds a utmp entry, some applications bizarrely do the + utmp call before the have PAM authenticate them to the system: + you're logged it, sort of...? Anyway, you can use the + "utmp_early" module argument in your PAM config file to make + allowances for this sort of problem. (There should be a PAM + standard for this, since if a module wants to actually map a + username then any early utmp entry will be for the unmapped + name = broken.) */ + + if (ctrl & PAM_UTMP_EARLY) { + count = 0; + } else { + count = 1; + } + + while((ut = getutent())) { +#ifdef USER_PROCESS + if (ut->ut_type != USER_PROCESS) { + continue; + } +#endif + if (ut->UT_USER[0] == '\0') { + continue; + } + if (!pl->flag_numsyslogins) { + if (((pl->login_limit_def == LIMITS_DEF_USER) + || (pl->login_limit_def == LIMITS_DEF_GROUP) + || (pl->login_limit_def == LIMITS_DEF_DEFAULT)) + && strncmp(name, ut->UT_USER, sizeof(ut->UT_USER)) != 0) { + continue; + } + if ((pl->login_limit_def == LIMITS_DEF_ALLGROUP) + && !pam_modutil_user_in_group_nam_nam(pamh, ut->UT_USER, pl->login_group)) { + continue; + } + } + if (++count > limit) { + break; + } + } + endutent(); + if (count > limit) { + if (name) { + pam_syslog(pamh, LOG_WARNING, + "Too many logins (max %d) for %s", limit, name); + } else { + pam_syslog(pamh, LOG_WARNING, "Too many system logins (max %d)", limit); + } + return LOGIN_ERR; + } + return 0; +} + +static int init_limits(struct pam_limit_s *pl) +{ + int i; + int retval = PAM_SUCCESS; + + D(("called.")); + + for(i = 0; i < RLIM_NLIMITS; i++) { + int r = getrlimit(i, &pl->limits[i].limit); + if (r == -1) { + pl->limits[i].supported = 0; + if (errno != EINVAL) { + retval = !PAM_SUCCESS; + } + } else { + pl->limits[i].supported = 1; + pl->limits[i].src_soft = LIMITS_DEF_NONE; + pl->limits[i].src_hard = LIMITS_DEF_NONE; + } + } + + errno = 0; + pl->priority = getpriority (PRIO_PROCESS, 0); + if (pl->priority == -1 && errno != 0) + retval = !PAM_SUCCESS; + pl->login_limit = -2; + pl->login_limit_def = LIMITS_DEF_NONE; + + return retval; +} + +static void +process_limit (const pam_handle_t *pamh, int source, const char *lim_type, + const char *lim_item, const char *lim_value, + int ctrl, struct pam_limit_s *pl) +{ + int limit_item; + int limit_type = 0; + int int_value = 0; + rlim_t rlimit_value = 0; + char *endptr; + const char *value_orig = lim_value; + + if (ctrl & PAM_DEBUG_ARG) + pam_syslog(pamh, LOG_DEBUG, "%s: processing %s %s %s for %s", + __FUNCTION__, lim_type, lim_item, lim_value, + limits_def_names[source]); + + if (strcmp(lim_item, "cpu") == 0) + limit_item = RLIMIT_CPU; + else if (strcmp(lim_item, "fsize") == 0) + limit_item = RLIMIT_FSIZE; + else if (strcmp(lim_item, "data") == 0) + limit_item = RLIMIT_DATA; + else if (strcmp(lim_item, "stack") == 0) + limit_item = RLIMIT_STACK; + else if (strcmp(lim_item, "core") == 0) + limit_item = RLIMIT_CORE; + else if (strcmp(lim_item, "rss") == 0) + limit_item = RLIMIT_RSS; + else if (strcmp(lim_item, "nproc") == 0) + limit_item = RLIMIT_NPROC; + else if (strcmp(lim_item, "nofile") == 0) + limit_item = RLIMIT_NOFILE; + else if (strcmp(lim_item, "memlock") == 0) + limit_item = RLIMIT_MEMLOCK; +#ifdef RLIMIT_AS + else if (strcmp(lim_item, "as") == 0) + limit_item = RLIMIT_AS; +#endif /*RLIMIT_AS*/ +#ifdef RLIMIT_LOCKS + else if (strcmp(lim_item, "locks") == 0) + limit_item = RLIMIT_LOCKS; +#endif +#ifdef RLIMIT_SIGPENDING + else if (strcmp(lim_item, "sigpending") == 0) + limit_item = RLIMIT_SIGPENDING; +#endif +#ifdef RLIMIT_MSGQUEUE + else if (strcmp(lim_item, "msgqueue") == 0) + limit_item = RLIMIT_MSGQUEUE; +#endif +#ifdef RLIMIT_NICE + else if (strcmp(lim_item, "nice") == 0) + limit_item = RLIMIT_NICE; +#endif +#ifdef RLIMIT_RTPRIO + else if (strcmp(lim_item, "rtprio") == 0) + limit_item = RLIMIT_RTPRIO; +#endif + else if (strcmp(lim_item, "maxlogins") == 0) { + limit_item = LIMIT_LOGIN; + pl->flag_numsyslogins = 0; + } else if (strcmp(lim_item, "maxsyslogins") == 0) { + limit_item = LIMIT_NUMSYSLOGINS; + pl->flag_numsyslogins = 1; + } else if (strcmp(lim_item, "priority") == 0) { + limit_item = LIMIT_PRI; + } else { + pam_syslog(pamh, LOG_DEBUG, "unknown limit item '%s'", lim_item); + return; + } + + if (strcmp(lim_type,"soft")==0) + limit_type=LIMIT_SOFT; + else if (strcmp(lim_type, "hard")==0) + limit_type=LIMIT_HARD; + else if (strcmp(lim_type,"-")==0) + limit_type=LIMIT_SOFT | LIMIT_HARD; + else if (limit_item != LIMIT_LOGIN && limit_item != LIMIT_NUMSYSLOGINS) { + pam_syslog(pamh, LOG_DEBUG, "unknown limit type '%s'", lim_type); + return; + } + if (limit_item != LIMIT_PRI +#ifdef RLIMIT_NICE + && limit_item != RLIMIT_NICE +#endif + && (strcmp(lim_value, "-1") == 0 + || strcmp(lim_value, "-") == 0 || strcmp(lim_value, "unlimited") == 0 + || strcmp(lim_value, "infinity") == 0)) { + int_value = -1; + rlimit_value = RLIM_INFINITY; + } else if (limit_item == LIMIT_PRI || limit_item == LIMIT_LOGIN || +#ifdef RLIMIT_NICE + limit_item == RLIMIT_NICE || +#endif + limit_item == LIMIT_NUMSYSLOGINS) { + long temp; + temp = strtol (lim_value, &endptr, 10); + temp = temp < INT_MAX ? temp : INT_MAX; + int_value = temp > INT_MIN ? temp : INT_MIN; + if (int_value == 0 && value_orig == endptr) { + pam_syslog(pamh, LOG_DEBUG, + "wrong limit value '%s' for limit type '%s'", + lim_value, lim_type); + return; + } + } else { +#ifdef __USE_FILE_OFFSET64 + rlimit_value = strtoull (lim_value, &endptr, 10); +#else + rlimit_value = strtoul (lim_value, &endptr, 10); +#endif + if (rlimit_value == 0 && value_orig == endptr) { + pam_syslog(pamh, LOG_DEBUG, + "wrong limit value '%s' for limit type '%s'", + lim_value, lim_type); + return; + } + } + + /* one more special case when limiting logins */ + if ((source == LIMITS_DEF_ALL || source == LIMITS_DEF_ALLGROUP) + && (limit_item != LIMIT_LOGIN)) { + if (ctrl & PAM_DEBUG_ARG) + pam_syslog(pamh, LOG_DEBUG, + "'%%' domain valid for maxlogins type only"); + return; + } + + switch(limit_item) { + case RLIMIT_CPU: + if (rlimit_value != RLIM_INFINITY) + { + if (rlimit_value >= RLIM_INFINITY/60) + rlimit_value = RLIM_INFINITY; + else + rlimit_value *= 60; + } + break; + case RLIMIT_FSIZE: + case RLIMIT_DATA: + case RLIMIT_STACK: + case RLIMIT_CORE: + case RLIMIT_RSS: + case RLIMIT_MEMLOCK: +#ifdef RLIMIT_AS + case RLIMIT_AS: +#endif + if (rlimit_value != RLIM_INFINITY) + { + if (rlimit_value >= RLIM_INFINITY/1024) + rlimit_value = RLIM_INFINITY; + else + rlimit_value *= 1024; + } + break; +#ifdef RLIMIT_NICE + case RLIMIT_NICE: + if (int_value > 19) + int_value = 19; + if (int_value < -20) + int_value = -20; + rlimit_value = 20 - int_value; +#endif + break; + } + + if ( (limit_item != LIMIT_LOGIN) + && (limit_item != LIMIT_NUMSYSLOGINS) + && (limit_item != LIMIT_PRI) ) { + if (limit_type & LIMIT_SOFT) { + if (pl->limits[limit_item].src_soft < source) { + return; + } else { + pl->limits[limit_item].limit.rlim_cur = rlimit_value; + pl->limits[limit_item].src_soft = source; + } + } + if (limit_type & LIMIT_HARD) { + if (pl->limits[limit_item].src_hard < source) { + return; + } else { + pl->limits[limit_item].limit.rlim_max = rlimit_value; + pl->limits[limit_item].src_hard = source; + } + } + } else { + /* recent kernels support negative priority limits (=raise priority) */ + + if (limit_item == LIMIT_PRI) { + pl->priority = int_value; + } else { + if (pl->login_limit_def < source) { + return; + } else { + pl->login_limit = int_value; + pl->login_limit_def = source; + } + } + } + return; +} + +static int parse_config_file(pam_handle_t *pamh, const char *uname, int ctrl, + struct pam_limit_s *pl) +{ + FILE *fil; + char buf[LINE_LENGTH]; + + /* check for the LIMITS_FILE */ + if (ctrl & PAM_DEBUG_ARG) + pam_syslog(pamh, LOG_DEBUG, "reading settings from '%s'", CONF_FILE); + fil = fopen(CONF_FILE, "r"); + if (fil == NULL) { + pam_syslog (pamh, LOG_WARNING, + "cannot read settings from %s: %m", CONF_FILE); + return PAM_SERVICE_ERR; + } + + /* start the show */ + while (fgets(buf, LINE_LENGTH, fil) != NULL) { + char domain[LINE_LENGTH]; + char ltype[LINE_LENGTH]; + char item[LINE_LENGTH]; + char value[LINE_LENGTH]; + int i; + size_t j; + char *tptr,*line; + + line = buf; + /* skip the leading white space */ + while (*line && isspace(*line)) + line++; + + /* Rip off the comments */ + tptr = strchr(line,'#'); + if (tptr) + *tptr = '\0'; + /* Rip off the newline char */ + tptr = strchr(line,'\n'); + if (tptr) + *tptr = '\0'; + /* Anything left ? */ + if (!strlen(line)) + continue; + + domain[0] = ltype[0] = item[0] = value[0] = '\0'; + + i = sscanf(line,"%s%s%s%s", domain, ltype, item, value); + D(("scanned line[%d]: domain[%s], ltype[%s], item[%s], value[%s]", + i, domain, ltype, item, value)); + + for(j=0; j < strlen(ltype); j++) + ltype[j]=tolower(ltype[j]); + + if (i == 4) { /* a complete line */ + for(j=0; j < strlen(item); j++) + item[j]=tolower(item[j]); + for(j=0; j < strlen(value); j++) + value[j]=tolower(value[j]); + + if (strcmp(uname, domain) == 0) /* this user have a limit */ + process_limit(pamh, LIMITS_DEF_USER, ltype, item, value, ctrl, pl); + else if (domain[0]=='@') { + if (ctrl & PAM_DEBUG_ARG) { + pam_syslog(pamh, LOG_DEBUG, + "checking if %s is in group %s", + uname, domain + 1); + } + if (pam_modutil_user_in_group_nam_nam(pamh, uname, domain+1)) + process_limit(pamh, LIMITS_DEF_GROUP, ltype, item, value, ctrl, + pl); + } else if (domain[0]=='%') { + if (ctrl & PAM_DEBUG_ARG) { + pam_syslog(pamh, LOG_DEBUG, + "checking if %s is in group %s", + uname, domain + 1); + } + if (strcmp(domain,"%") == 0) + process_limit(pamh, LIMITS_DEF_ALL, ltype, item, value, ctrl, + pl); + else if (pam_modutil_user_in_group_nam_nam(pamh, uname, domain+1)) { + strcpy(pl->login_group, domain+1); + process_limit(pamh, LIMITS_DEF_ALLGROUP, ltype, item, value, ctrl, + pl); + } + } else if (strcmp(domain, "*") == 0) + process_limit(pamh, LIMITS_DEF_DEFAULT, ltype, item, value, ctrl, + pl); + } else if (i == 2 && ltype[0] == '-') { /* Probably a no-limit line */ + if (strcmp(uname, domain) == 0) { + if (ctrl & PAM_DEBUG_ARG) { + pam_syslog(pamh, LOG_DEBUG, "no limits for '%s'", uname); + } + fclose(fil); + return PAM_IGNORE; + } else if (domain[0] == '@' && pam_modutil_user_in_group_nam_nam(pamh, uname, domain+1)) { + if (ctrl & PAM_DEBUG_ARG) { + pam_syslog(pamh, LOG_DEBUG, + "no limits for '%s' in group '%s'", + uname, domain+1); + } + fclose(fil); + return PAM_IGNORE; + } + } else { + pam_syslog(pamh, LOG_WARNING, "invalid line '%s' - skipped", line); + } + } + fclose(fil); + return PAM_SUCCESS; +} + +static int setup_limits(pam_handle_t *pamh, + const char *uname, uid_t uid, int ctrl, + struct pam_limit_s *pl) +{ + int i; + int status; + int retval = LIMITED_OK; + + for (i=0, status=LIMITED_OK; i<RLIM_NLIMITS; i++) { + if (!pl->limits[i].supported) { + /* skip it if its not known to the system */ + continue; + } + if (pl->limits[i].src_soft == LIMITS_DEF_NONE && + pl->limits[i].src_hard == LIMITS_DEF_NONE) { + /* skip it if its not initialized */ + continue; + } + if (pl->limits[i].limit.rlim_cur > pl->limits[i].limit.rlim_max) + pl->limits[i].limit.rlim_cur = pl->limits[i].limit.rlim_max; + status |= setrlimit(i, &pl->limits[i].limit); + } + + if (status) { + retval = LIMIT_ERR; + } + + status = setpriority(PRIO_PROCESS, 0, pl->priority); + if (status != 0) { + retval = LIMIT_ERR; + } + + if (uid == 0) { + D(("skip login limit check for uid=0")); + } else if (pl->login_limit > 0) { + if (check_logins(pamh, uname, pl->login_limit, ctrl, pl) == LOGIN_ERR) { +#ifdef HAVE_LIBAUDIT + if (!(ctrl & PAM_NO_AUDIT)) { + pam_modutil_audit_write(pamh, AUDIT_ANOM_LOGIN_SESSIONS, + "pam_limits", PAM_PERM_DENIED); + /* ignore return value as we fail anyway */ + } +#endif + retval |= LOGIN_ERR; + } + } else if (pl->login_limit == 0) { + retval |= LOGIN_ERR; + } + + return retval; +} + +/* now the session stuff */ +PAM_EXTERN int +pam_sm_open_session (pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + int retval; + int i; + int glob_rc; + char *user_name; + struct passwd *pwd; + int ctrl; + struct pam_limit_s plstruct; + struct pam_limit_s *pl = &plstruct; + glob_t globbuf; + const char *oldlocale; + + D(("called.")); + + memset(pl, 0, sizeof(*pl)); + memset(&globbuf, 0, sizeof(globbuf)); + + ctrl = _pam_parse(pamh, argc, argv, pl); + retval = pam_get_item( pamh, PAM_USER, (void*) &user_name ); + if ( user_name == NULL || retval != PAM_SUCCESS ) { + pam_syslog(pamh, LOG_CRIT, "open_session - error recovering username"); + return PAM_SESSION_ERR; + } + + pwd = pam_modutil_getpwnam(pamh, user_name); + if (!pwd) { + if (ctrl & PAM_DEBUG_ARG) + pam_syslog(pamh, LOG_WARNING, + "open_session username '%s' does not exist", user_name); + return PAM_USER_UNKNOWN; + } + + retval = init_limits(pl); + if (retval != PAM_SUCCESS) { + pam_syslog(pamh, LOG_WARNING, "cannot initialize"); + return PAM_ABORT; + } + + retval = parse_config_file(pamh, pwd->pw_name, ctrl, pl); + if (retval == PAM_IGNORE) { + D(("the configuration file ('%s') has an applicable '<domain> -' entry", CONF_FILE)); + return PAM_SUCCESS; + } + if (retval != PAM_SUCCESS || pl->conf_file != NULL) + /* skip reading limits.d if config file explicitely specified */ + goto out; + + /* Read subsequent *.conf files, if they exist. */ + + /* set the LC_COLLATE so the sorting order doesn't depend + on system locale */ + + oldlocale = setlocale(LC_COLLATE, "C"); + glob_rc = glob(LIMITS_CONF_GLOB, GLOB_ERR, NULL, &globbuf); + + if (oldlocale != NULL) + setlocale (LC_COLLATE, oldlocale); + + if (!glob_rc) { + /* Parse the *.conf files. */ + for (i = 0; globbuf.gl_pathv[i] != NULL; i++) { + pl->conf_file = globbuf.gl_pathv[i]; + retval = parse_config_file(pamh, pwd->pw_name, ctrl, pl); + if (retval == PAM_IGNORE) { + D(("the configuration file ('%s') has an applicable '<domain> -' entry", pl->conf_file)); + globfree(&globbuf); + return PAM_SUCCESS; + } + if (retval != PAM_SUCCESS) + goto out; + } + } + +out: + globfree(&globbuf); + if (retval != PAM_SUCCESS) + { + pam_syslog(pamh, LOG_WARNING, "error parsing the configuration file: '%s' ",CONF_FILE); + return retval; + } + + if (ctrl & PAM_DO_SETREUID) { + setreuid(pwd->pw_uid, -1); + } + + retval = setup_limits(pamh, pwd->pw_name, pwd->pw_uid, ctrl, pl); + if (retval & LOGIN_ERR) + pam_error(pamh, _("Too many logins for '%s'."), pwd->pw_name); + if (retval != LIMITED_OK) { + return PAM_PERM_DENIED; + } + + return PAM_SUCCESS; +} + +PAM_EXTERN int +pam_sm_close_session (pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + /* nothing to do */ + return PAM_SUCCESS; +} + +#ifdef PAM_STATIC + +/* static module data */ + +struct pam_module _pam_limits_modstruct = { + "pam_limits", + NULL, + NULL, + NULL, + pam_sm_open_session, + pam_sm_close_session, + NULL +}; +#endif + +/* + * Copyright (c) Cristian Gafton, 1996-1997, <gafton@redhat.com> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, and the entire permission notice in its entirety, + * including the disclaimer of warranties. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * ALTERNATIVELY, this product may be distributed under the terms of + * the GNU Public License, in which case the provisions of the GPL are + * required INSTEAD OF the above restrictions. (This clause is + * necessary due to a potential bad interaction between the GPL and + * the restrictions contained in a BSD-style copyright.) + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + */ diff --git a/modules/pam_limits/tst-pam_limits b/modules/pam_limits/tst-pam_limits new file mode 100755 index 00000000..f563beb7 --- /dev/null +++ b/modules/pam_limits/tst-pam_limits @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_limits.so diff --git a/modules/pam_listfile/Makefile.am b/modules/pam_listfile/Makefile.am new file mode 100644 index 00000000..2f211320 --- /dev/null +++ b/modules/pam_listfile/Makefile.am @@ -0,0 +1,31 @@ +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README $(MANS) $(XMLS) tst-pam_listfile + +man_MANS = pam_listfile.8 +XMLS = README.xml pam_listfile.8.xml + +TESTS = tst-pam_listfile + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_listfile.la +pam_listfile_la_LIBADD = -L$(top_builddir)/libpam -lpam + +if ENABLE_REGENERATE_MAN +noinst_DATA = README +README: pam_listfile.8.xml +-include $(top_srcdir)/Make.xml.rules +endif + diff --git a/modules/pam_listfile/Makefile.in b/modules/pam_listfile/Makefile.in new file mode 100644 index 00000000..89d0427b --- /dev/null +++ b/modules/pam_listfile/Makefile.in @@ -0,0 +1,667 @@ +# Makefile.in generated by automake 1.10.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY, to the extent permitted by law; without +# even the implied warranty of MERCHANTABILITY or FITNESS FOR A +# PARTICULAR PURPOSE. + +@SET_MAKE@ + +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + + +VPATH = @srcdir@ +pkgdatadir = $(datadir)/@PACKAGE@ +pkglibdir = $(libdir)/@PACKAGE@ +pkgincludedir = $(includedir)/@PACKAGE@ +am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd +install_sh_DATA = $(install_sh) -c -m 644 +install_sh_PROGRAM = $(install_sh) -c +install_sh_SCRIPT = $(install_sh) -c +INSTALL_HEADER = $(INSTALL_DATA) +transform = $(program_transform_name) +NORMAL_INSTALL = : +PRE_INSTALL = : +POST_INSTALL = : +NORMAL_UNINSTALL = : +PRE_UNINSTALL = : +POST_UNINSTALL = : +build_triplet = @build@ +host_triplet = @host@ +@HAVE_VERSIONING_TRUE@am__append_1 = -Wl,--version-script=$(srcdir)/../modules.map +subdir = modules/pam_listfile +DIST_COMMON = README $(srcdir)/Makefile.am $(srcdir)/Makefile.in +ACLOCAL_M4 = $(top_srcdir)/aclocal.m4 +am__aclocal_m4_deps = $(top_srcdir)/m4/gettext.m4 \ + $(top_srcdir)/m4/iconv.m4 \ + $(top_srcdir)/m4/jh_path_xml_catalog.m4 \ + $(top_srcdir)/m4/ld-O1.m4 $(top_srcdir)/m4/ld-as-needed.m4 \ + $(top_srcdir)/m4/lib-ld.m4 $(top_srcdir)/m4/lib-link.m4 \ + $(top_srcdir)/m4/lib-prefix.m4 $(top_srcdir)/m4/libprelude.m4 \ + $(top_srcdir)/m4/nls.m4 $(top_srcdir)/m4/po.m4 \ + $(top_srcdir)/m4/progtest.m4 $(top_srcdir)/acinclude.m4 \ + $(top_srcdir)/configure.in +am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \ + $(ACLOCAL_M4) +mkinstalldirs = $(SHELL) 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uninstall-man uninstall-man8 \ + uninstall-securelibLTLIBRARIES + +@ENABLE_REGENERATE_MAN_TRUE@README: pam_listfile.8.xml +@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_listfile/README b/modules/pam_listfile/README new file mode 100644 index 00000000..7fe7051b --- /dev/null +++ b/modules/pam_listfile/README @@ -0,0 +1,101 @@ +pam_listfile — deny or allow services based on an arbitrary file + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +pam_listfile is a PAM module which provides a way to deny or allow services +based on an arbitrary file. + +The module gets the item of the type specified -- user specifies the username, +PAM_USER; tty specifies the name of the terminal over which the request has +been made, PAM_TTY; rhost specifies the name of the remote host (if any) from +which the request was made, PAM_RHOST; and ruser specifies the name of the +remote user (if available) who made the request, PAM_RUSER -- and looks for an +instance of that item in the file=filename. filename contains one line per item +listed. If the item is found, then if sense=allow, PAM_SUCCESS is returned, +causing the authorization request to succeed; else if sense=deny, PAM_AUTH_ERR +is returned, causing the authorization request to fail. + +If an error is encountered (for instance, if filename does not exist, or a +poorly-constructed argument is encountered), then if onerr=succeed, PAM_SUCCESS +is returned, otherwise if onerr=fail, PAM_AUTH_ERR or PAM_SERVICE_ERR (as +appropriate) will be returned. + +An additional argument, apply=, can be used to restrict the application of the +above to a specific user (apply=username) or a given group (apply=@groupname). +This added restriction is only meaningful when used with the tty, rhost and +shell items. + +Besides this last one, all arguments should be specified; do not count on any +default behavior. + +No credentials are awarded by this module. + +OPTIONS + +item=[tty|user|rhost|ruser|group|shell] + + What is listed in the file and should be checked for. + +sense=[allow|deny] + + Action to take if found in file, if the item is NOT found in the file, then + the opposite action is requested. + +file=/path/filename + + File containing one item per line. The file needs to be a plain file and + not world writeable. + +onerr=[succeed|fail] + + What to do if something weird happens like being unable to open the file. + +apply=[user|@group] + + Restrict the user class for which the restriction apply. Note that with + item=[user|ruser|group] this does not make sense, but for item=[tty|rhost| + shell] it have a meaning. + +quiet + + Do not treat service refusals or missing list files as errors that need to + be logged. + +EXAMPLES + +Classic 'ftpusers' authentication can be implemented with this entry in /etc/ +pam.d/ftpd: + +# +# deny ftp-access to users listed in the /etc/ftpusers file +# +auth required pam_listfile.so \ + onerr=succeed item=user sense=deny file=/etc/ftpusers + + +Note, users listed in /etc/ftpusers file are (counterintuitively) not allowed +access to the ftp service. + +To allow login access only for certain users, you can use a /etc/pam.d/login +entry like this: + +# +# permit login to users listed in /etc/loginusers +# +auth required pam_listfile.so \ + onerr=fail item=user sense=allow file=/etc/loginusers + + +For this example to work, all users who are allowed to use the login service +should be listed in the file /etc/loginusers. Unless you are explicitly trying +to lock out root, make sure that when you do this, you leave a way for root to +log in, either by listing root in /etc/loginusers, or by listing a user who is +able to su to the root account. + +AUTHOR + +pam_listfile was written by Michael K. Johnson <johnsonm@redhat.com> and Elliot +Lee <sopwith@cuc.edu>. + diff --git a/modules/pam_listfile/README.xml b/modules/pam_listfile/README.xml new file mode 100644 index 00000000..d851aef3 --- /dev/null +++ b/modules/pam_listfile/README.xml @@ -0,0 +1,41 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_listfile.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_listfile.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_listfile-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_listfile.8.xml" xpointer='xpointer(//refsect1[@id = "pam_listfile-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_listfile.8.xml" xpointer='xpointer(//refsect1[@id = "pam_listfile-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_listfile.8.xml" xpointer='xpointer(//refsect1[@id = "pam_listfile-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_listfile.8.xml" xpointer='xpointer(//refsect1[@id = "pam_listfile-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_listfile/pam_listfile.8 b/modules/pam_listfile/pam_listfile.8 new file mode 100644 index 00000000..52b89e8f --- /dev/null +++ b/modules/pam_listfile/pam_listfile.8 @@ -0,0 +1,189 @@ +.\" Title: pam_listfile +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_LISTFILE" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_listfile - deny or allow services based on an arbitrary file +.SH "SYNOPSIS" +.HP 16 +\fBpam_listfile\.so\fR item=[tty|user|rhost|ruser|group|shell] sense=[allow|deny] file=\fI/path/filename\fR onerr=[succeed|fail] [apply=[\fIuser\fR|\fI@group\fR]] [quiet] +.SH "DESCRIPTION" +.PP +pam_listfile is a PAM module which provides a way to deny or allow services based on an arbitrary file\. +.PP +The module gets the +\fBitem\fR +of the type specified \-\- +\fIuser\fR +specifies the username, +\fIPAM_USER\fR; tty specifies the name of the terminal over which the request has been made, +\fIPAM_TTY\fR; rhost specifies the name of the remote host (if any) from which the request was made, +\fIPAM_RHOST\fR; and ruser specifies the name of the remote user (if available) who made the request, +\fIPAM_RUSER\fR +\-\- and looks for an instance of that item in the +\fBfile=\fR\fB\fIfilename\fR\fR\. +\fIfilename\fR +contains one line per item listed\. If the item is found, then if +\fBsense=\fR\fB\fIallow\fR\fR, +\fIPAM_SUCCESS\fR +is returned, causing the authorization request to succeed; else if +\fBsense=\fR\fB\fIdeny\fR\fR, +\fIPAM_AUTH_ERR\fR +is returned, causing the authorization request to fail\. +.PP +If an error is encountered (for instance, if +\fIfilename\fR +does not exist, or a poorly\-constructed argument is encountered), then if +\fIonerr=succeed\fR, +\fIPAM_SUCCESS\fR +is returned, otherwise if +\fIonerr=fail\fR, +\fIPAM_AUTH_ERR\fR +or +\fIPAM_SERVICE_ERR\fR +(as appropriate) will be returned\. +.PP +An additional argument, +\fBapply=\fR, can be used to restrict the application of the above to a specific user (\fBapply=\fR\fB\fIusername\fR\fR) or a given group (\fBapply=\fR\fB\fI@groupname\fR\fR)\. This added restriction is only meaningful when used with the +\fItty\fR, +\fIrhost\fR +and +\fIshell\fR +items\. +.PP +Besides this last one, all arguments should be specified; do not count on any default behavior\. +.PP +No credentials are awarded by this module\. +.SH "OPTIONS" +.PP +.PP +\fBitem=[tty|user|rhost|ruser|group|shell]\fR +.RS 4 +What is listed in the file and should be checked for\. +.RE +.PP +\fBsense=[allow|deny]\fR +.RS 4 +Action to take if found in file, if the item is NOT found in the file, then the opposite action is requested\. +.RE +.PP +\fBfile=\fR\fB\fI/path/filename\fR\fR +.RS 4 +File containing one item per line\. The file needs to be a plain file and not world writeable\. +.RE +.PP +\fBonerr=[succeed|fail]\fR +.RS 4 +What to do if something weird happens like being unable to open the file\. +.RE +.PP +\fBapply=[\fR\fB\fIuser\fR\fR\fB|\fR\fB\fI@group\fR\fR\fB]\fR +.RS 4 +Restrict the user class for which the restriction apply\. Note that with +\fBitem=[user|ruser|group]\fR +this does not make sense, but for +\fBitem=[tty|rhost|shell]\fR +it have a meaning\. +.RE +.PP +\fBquiet\fR +.RS 4 +Do not treat service refusals or missing list files as errors that need to be logged\. +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +The services +\fBauth\fR, +\fBaccount\fR, +\fBpassword\fR +and +\fBsession\fR +are supported\. +.SH "RETURN VALUES" +.PP +.PP +PAM_AUTH_ERR +.RS 4 +Authentication failure\. +.RE +.PP +PAM_BUF_ERR +.RS 4 +Memory buffer error\. +.RE +.PP +PAM_IGNORE +.RS 4 +The rule does not apply to the +\fBapply\fR +option\. +.RE +.PP +PAM_SERVICE_ERR +.RS 4 +Error in service module\. +.RE +.PP +PAM_SUCCESS +.RS 4 +Success\. +.RE +.SH "EXAMPLES" +.PP +Classic \'ftpusers\' authentication can be implemented with this entry in +\fI/etc/pam\.d/ftpd\fR: +.sp +.RS 4 +.nf +# +# deny ftp\-access to users listed in the /etc/ftpusers file +# +auth required pam_listfile\.so \e + onerr=succeed item=user sense=deny file=/etc/ftpusers + +.fi +.RE +.sp +Note, users listed in +\fI/etc/ftpusers\fR +file are (counterintuitively) +\fInot\fR +allowed access to the ftp service\. +.PP +To allow login access only for certain users, you can use a +\fI/etc/pam\.d/login\fR +entry like this: +.sp +.RS 4 +.nf +# +# permit login to users listed in /etc/loginusers +# +auth required pam_listfile\.so \e + onerr=fail item=user sense=allow file=/etc/loginusers + +.fi +.RE +.sp +For this example to work, all users who are allowed to use the login service should be listed in the file +\fI/etc/loginusers\fR\. Unless you are explicitly trying to lock out root, make sure that when you do this, you leave a way for root to log in, either by listing root in +\fI/etc/loginusers\fR, or by listing a user who is able to +\fIsu\fR +to the root account\. +.SH "SEE ALSO" +.PP + +\fBpam.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_listfile was written by Michael K\. Johnson <johnsonm@redhat\.com> and Elliot Lee <sopwith@cuc\.edu>\. diff --git a/modules/pam_listfile/pam_listfile.8.xml b/modules/pam_listfile/pam_listfile.8.xml new file mode 100644 index 00000000..e54e80a4 --- /dev/null +++ b/modules/pam_listfile/pam_listfile.8.xml @@ -0,0 +1,297 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_listfile"> + + <refmeta> + <refentrytitle>pam_listfile</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_listfile-name"> + <refname>pam_listfile</refname> + <refpurpose>deny or allow services based on an arbitrary file</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_listfile-cmdsynopsis"> + <command>pam_listfile.so</command> + <arg choice="plain"> + item=[tty|user|rhost|ruser|group|shell] + </arg> + <arg choice="plain"> + sense=[allow|deny] + </arg> + <arg choice="plain"> + file=<replaceable>/path/filename</replaceable> + </arg> + <arg choice="plain"> + onerr=[succeed|fail] + </arg> + <arg choice="opt"> + apply=[<replaceable>user</replaceable>|<replaceable>@group</replaceable>] + </arg> + <arg choice="opt"> + quiet + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_listfile-description"> + + <title>DESCRIPTION</title> + + <para> + pam_listfile is a PAM module which provides a way to deny or + allow services based on an arbitrary file. + </para> + <para> + The module gets the <option>item</option> of the type specified -- + <emphasis>user</emphasis> specifies the username, + <emphasis>PAM_USER</emphasis>; tty specifies the name of the terminal + over which the request has been made, <emphasis>PAM_TTY</emphasis>; + rhost specifies the name of the remote host (if any) from which the + request was made, <emphasis>PAM_RHOST</emphasis>; and ruser specifies + the name of the remote user (if available) who made the request, + <emphasis>PAM_RUSER</emphasis> -- and looks for an instance of that + item in the <option>file=<replaceable>filename</replaceable></option>. + <filename>filename</filename> contains one line per item listed. If + the item is found, then if + <option>sense=<replaceable>allow</replaceable></option>, + <emphasis>PAM_SUCCESS</emphasis> is returned, causing the authorization + request to succeed; else if + <option>sense=<replaceable>deny</replaceable></option>, + <emphasis>PAM_AUTH_ERR</emphasis> is returned, causing the authorization + request to fail. + </para> + <para> + If an error is encountered (for instance, if + <filename>filename</filename> does not exist, or a poorly-constructed + argument is encountered), then if <emphasis>onerr=succeed</emphasis>, + <emphasis>PAM_SUCCESS</emphasis> is returned, otherwise if + <emphasis>onerr=fail</emphasis>, <emphasis>PAM_AUTH_ERR</emphasis> or + <emphasis>PAM_SERVICE_ERR</emphasis> (as appropriate) will be returned. + </para> + <para> + An additional argument, <option>apply=</option>, can be used + to restrict the application of the above to a specific user + (<option>apply=<replaceable>username</replaceable></option>) + or a given group + (<option>apply=<replaceable>@groupname</replaceable></option>). + This added restriction is only meaningful when used with the + <emphasis>tty</emphasis>, <emphasis>rhost</emphasis> and + <emphasis>shell</emphasis> items. + </para> + <para> + Besides this last one, all arguments should be specified; do not + count on any default behavior. + </para> + <para> + No credentials are awarded by this module. + </para> + </refsect1> + + <refsect1 id="pam_listfile-options"> + + <title>OPTIONS</title> + <para> + <variablelist> + + <varlistentry> + <term> + <option>item=[tty|user|rhost|ruser|group|shell]</option> + </term> + <listitem> + <para> + What is listed in the file and should be checked for. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>sense=[allow|deny]</option> + </term> + <listitem> + <para> + Action to take if found in file, if the item is NOT found in + the file, then the opposite action is requested. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>file=<replaceable>/path/filename</replaceable></option> + </term> + <listitem> + <para> + File containing one item per line. The file needs to be a plain + file and not world writeable. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>onerr=[succeed|fail]</option> + </term> + <listitem> + <para> + What to do if something weird happens like being unable to open + the file. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>apply=[<replaceable>user</replaceable>|<replaceable>@group</replaceable>]</option> + </term> + <listitem> + <para> + Restrict the user class for which the restriction apply. Note that + with <option>item=[user|ruser|group]</option> this does not make sense, + but for <option>item=[tty|rhost|shell]</option> it have a meaning. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>quiet</option> + </term> + <listitem> + <para> + Do not treat service refusals or missing list files as + errors that need to be logged. + </para> + </listitem> + </varlistentry> + </variablelist> + + </para> + </refsect1> + + <refsect1 id="pam_listfile-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + The services <option>auth</option>, <option>account</option>, + <option>password</option> and <option>session</option> are supported. + </para> + </refsect1> + + <refsect1 id='pam_listfile-return_values'> + <title>RETURN VALUES</title> + <para> + <variablelist> + + <varlistentry> + <term>PAM_AUTH_ERR</term> + <listitem> + <para>Authentication failure.</para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_BUF_ERR</term> + <listitem> + <para> + Memory buffer error. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_IGNORE</term> + <listitem> + <para> + The rule does not apply to the <option>apply</option> option. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_SERVICE_ERR</term> + <listitem> + <para> + Error in service module. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + Success. + </para> + </listitem> + </varlistentry> + + </variablelist> + </para> + </refsect1> + + <refsect1 id='pam_listfile-examples'> + <title>EXAMPLES</title> + <para> + Classic 'ftpusers' authentication can be implemented with this entry + in <filename>/etc/pam.d/ftpd</filename>: + <programlisting> +# +# deny ftp-access to users listed in the /etc/ftpusers file +# +auth required pam_listfile.so \ + onerr=succeed item=user sense=deny file=/etc/ftpusers + </programlisting> + Note, users listed in <filename>/etc/ftpusers</filename> file are + (counterintuitively) <emphasis>not</emphasis> allowed access to + the ftp service. + </para> + <para> + To allow login access only for certain users, you can use a + <filename>/etc/pam.d/login</filename> entry like this: + <programlisting> +# +# permit login to users listed in /etc/loginusers +# +auth required pam_listfile.so \ + onerr=fail item=user sense=allow file=/etc/loginusers + </programlisting> + For this example to work, all users who are allowed to use the + login service should be listed in the file + <filename>/etc/loginusers</filename>. Unless you are explicitly + trying to lock out root, make sure that when you do this, you leave + a way for root to log in, either by listing root in + <filename>/etc/loginusers</filename>, or by listing a user who is + able to <emphasis>su</emphasis> to the root account. + </para> + </refsect1> + + <refsect1 id='pam_listfile-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_listfile-author'> + <title>AUTHOR</title> + <para> + pam_listfile was written by Michael K. Johnson <johnsonm@redhat.com> + and Elliot Lee <sopwith@cuc.edu>. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_listfile/pam_listfile.c b/modules/pam_listfile/pam_listfile.c new file mode 100644 index 00000000..f276e5b8 --- /dev/null +++ b/modules/pam_listfile/pam_listfile.c @@ -0,0 +1,462 @@ +/* + * by Elliot Lee <sopwith@redhat.com>, Red Hat Software. July 25, 1996. + * log refused access error christopher mccrory <chrismcc@netus.com> 1998/7/11 + * + * This code began life as the pam_rootok module. + */ + +#include "config.h" + +#include <stdio.h> +#include <stdlib.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <unistd.h> +#include <syslog.h> +#include <stdarg.h> +#include <string.h> +#include <pwd.h> +#include <grp.h> + +#ifdef DEBUG +#include <assert.h> +#endif + +/* + * here, we make a definition for the externally accessible function + * in this file (this definition is required for static a module + * but strongly encouraged generally) it is used to instruct the + * modules include file to define the function prototypes. + */ + +#define PAM_SM_AUTH +#define PAM_SM_ACCOUNT +#define PAM_SM_PASSWORD +#define PAM_SM_SESSION + +#include <security/pam_modules.h> +#include <security/_pam_macros.h> +#include <security/pam_modutil.h> +#include <security/pam_ext.h> + +/* checks if a user is on a list of members */ +static int is_on_list(char * const *list, const char *member) +{ + while (*list) { + if (strcmp(*list, member) == 0) + return 1; + list++; + } + return 0; +} + +/* --- authentication management functions (only) --- */ + +/* Extended Items that are not directly available via pam_get_item() */ +#define EI_GROUP (1 << 0) +#define EI_SHELL (1 << 1) + +/* Constants for apply= parameter */ +#define APPLY_TYPE_NULL 0 +#define APPLY_TYPE_NONE 1 +#define APPLY_TYPE_USER 2 +#define APPLY_TYPE_GROUP 3 + +#define LESSER(a, b) ((a) < (b) ? (a) : (b)) + +PAM_EXTERN int +pam_sm_authenticate (pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + int retval, i, citem=0, extitem=0, onerr=PAM_SERVICE_ERR, sense=2, quiet=0; + const void *void_citemp; + const char *citemp; + char *ifname=NULL; + char aline[256]; + char mybuf[256],myval[256]; + struct stat fileinfo; + FILE *inf; + char apply_val[256]; + int apply_type; + + /* Stuff for "extended" items */ + struct passwd *userinfo; + struct group *grpinfo; + char *itemlist[256]; /* Maximum of 256 items */ + + apply_type=APPLY_TYPE_NULL; + memset(apply_val,0,sizeof(apply_val)); + + for(i=0; i < argc; i++) { + { + const char *junk; + + memset(mybuf,'\0',sizeof(mybuf)); + memset(myval,'\0',sizeof(mybuf)); + junk = strchr(argv[i], '='); + if((junk == NULL) || (junk - argv[i]) >= (int) sizeof(mybuf)) { + pam_syslog(pamh,LOG_ERR, "Bad option: \"%s\"", + argv[i]); + continue; + } + strncpy(mybuf, argv[i], + LESSER(junk - argv[i], (int)sizeof(mybuf) - 1)); + strncpy(myval, junk + 1, sizeof(myval) - 1); + } + if(!strcmp(mybuf,"onerr")) + if(!strcmp(myval,"succeed")) + onerr = PAM_SUCCESS; + else if(!strcmp(myval,"fail")) + onerr = PAM_SERVICE_ERR; + else { + if (ifname) free (ifname); + return PAM_SERVICE_ERR; + } + else if(!strcmp(mybuf,"sense")) + if(!strcmp(myval,"allow")) + sense=0; + else if(!strcmp(myval,"deny")) + sense=1; + else { + if (ifname) free (ifname); + return onerr; + } + else if(!strcmp(mybuf,"file")) { + if (ifname) free (ifname); + ifname = (char *)malloc(strlen(myval)+1); + if (!ifname) + return PAM_BUF_ERR; + strcpy(ifname,myval); + } else if(!strcmp(mybuf,"item")) + if(!strcmp(myval,"user")) + citem = PAM_USER; + else if(!strcmp(myval,"tty")) + citem = PAM_TTY; + else if(!strcmp(myval,"rhost")) + citem = PAM_RHOST; + else if(!strcmp(myval,"ruser")) + citem = PAM_RUSER; + else { /* These items are related to the user, but are not + directly gettable with pam_get_item */ + citem = PAM_USER; + if(!strcmp(myval,"group")) + extitem = EI_GROUP; + else if(!strcmp(myval,"shell")) + extitem = EI_SHELL; + else + citem = 0; + } else if(!strcmp(mybuf,"apply")) { + apply_type=APPLY_TYPE_NONE; + memset(apply_val,'\0',sizeof(apply_val)); + if (myval[0]=='@') { + apply_type=APPLY_TYPE_GROUP; + strncpy(apply_val,myval+1,sizeof(apply_val)-1); + } else { + apply_type=APPLY_TYPE_USER; + strncpy(apply_val,myval,sizeof(apply_val)-1); + } + } else if (!strcmp(mybuf,"quiet")) { + quiet = 1; + } else { + free(ifname); + pam_syslog(pamh,LOG_ERR, "Unknown option: %s",mybuf); + return onerr; + } + } + + if(!citem) { + pam_syslog(pamh,LOG_ERR, + "Unknown item or item not specified"); + free(ifname); + return onerr; + } else if(!ifname) { + pam_syslog(pamh,LOG_ERR, "List filename not specified"); + return onerr; + } else if(sense == 2) { + pam_syslog(pamh,LOG_ERR, + "Unknown sense or sense not specified"); + free(ifname); + return onerr; + } else if( + (apply_type==APPLY_TYPE_NONE) || + ((apply_type!=APPLY_TYPE_NULL) && (*apply_val=='\0')) + ) { + pam_syslog(pamh,LOG_ERR, + "Invalid usage for apply= parameter"); + free (ifname); + return onerr; + } + + /* Check if it makes sense to use the apply= parameter */ + if (apply_type != APPLY_TYPE_NULL) { + if((citem==PAM_USER) || (citem==PAM_RUSER)) { + pam_syslog(pamh,LOG_WARNING, + "Non-sense use for apply= parameter"); + apply_type=APPLY_TYPE_NULL; + } + if(extitem && (extitem==EI_GROUP)) { + pam_syslog(pamh,LOG_WARNING, + "Non-sense use for apply= parameter"); + apply_type=APPLY_TYPE_NULL; + } + } + + /* Short-circuit - test if this session apply for this user */ + { + const char *user_name; + int rval; + + rval=pam_get_user(pamh,&user_name,NULL); + if((rval==PAM_SUCCESS) && user_name && user_name[0]) { + /* Got it ? Valid ? */ + if(apply_type==APPLY_TYPE_USER) { + if(strcmp(user_name, apply_val)) { + /* Does not apply to this user */ +#ifdef DEBUG + pam_syslog(pamh,LOG_DEBUG, + "don't apply: apply=%s, user=%s", + apply_val,user_name); +#endif /* DEBUG */ + free(ifname); + return PAM_IGNORE; + } + } else if(apply_type==APPLY_TYPE_GROUP) { + if(!pam_modutil_user_in_group_nam_nam(pamh,user_name,apply_val)) { + /* Not a member of apply= group */ +#ifdef DEBUG + pam_syslog(pamh,LOG_DEBUG, + + "don't apply: %s not a member of group %s", + user_name,apply_val); +#endif /* DEBUG */ + free(ifname); + return PAM_IGNORE; + } + } + } + } + + retval = pam_get_item(pamh,citem,&void_citemp); + citemp = void_citemp; + if(retval != PAM_SUCCESS) { + return onerr; + } + if((citem == PAM_USER) && !citemp) { + retval = pam_get_user(pamh,&citemp,NULL); + if (retval != PAM_SUCCESS || !citemp) { + free(ifname); + return PAM_SERVICE_ERR; + } + } + if((citem == PAM_TTY) && citemp) { + /* Normalize the TTY name. */ + if(strncmp(citemp, "/dev/", 5) == 0) { + citemp += 5; + } + } + + if(!citemp || (strlen(citemp) == 0)) { + free(ifname); + /* The item was NULL - we are sure not to match */ + return sense?PAM_SUCCESS:PAM_AUTH_ERR; + } + + if(extitem) { + switch(extitem) { + case EI_GROUP: + userinfo = pam_modutil_getpwnam(pamh, citemp); + if (userinfo == NULL) { + pam_syslog(pamh,LOG_ERR, "getpwnam(%s) failed", + citemp); + free(ifname); + return onerr; + } + grpinfo = pam_modutil_getgrgid(pamh, userinfo->pw_gid); + if (grpinfo == NULL) { + pam_syslog(pamh,LOG_ERR, "getgrgid(%d) failed", + (int)userinfo->pw_gid); + free(ifname); + return onerr; + } + itemlist[0] = x_strdup(grpinfo->gr_name); + setgrent(); + for (i=1; (i < (int)(sizeof(itemlist)/sizeof(itemlist[0])-1)) && + (grpinfo = getgrent()); ) { + if (is_on_list(grpinfo->gr_mem,citemp)) { + itemlist[i++] = x_strdup(grpinfo->gr_name); + } + } + endgrent(); + itemlist[i] = NULL; + break; + case EI_SHELL: + /* Assume that we have already gotten PAM_USER in + pam_get_item() - a valid assumption since citem + gets set to PAM_USER in the extitem switch */ + userinfo = pam_modutil_getpwnam(pamh, citemp); + if (userinfo == NULL) { + pam_syslog(pamh,LOG_ERR, "getpwnam(%s) failed", + citemp); + free(ifname); + return onerr; + } + citemp = userinfo->pw_shell; + break; + default: + pam_syslog(pamh,LOG_ERR, + + "Internal weirdness, unknown extended item %d", + extitem); + free(ifname); + return onerr; + } + } +#ifdef DEBUG + pam_syslog(pamh,LOG_INFO, + + "Got file = %s, item = %d, value = %s, sense = %d", + ifname, citem, citemp, sense); +#endif + if(lstat(ifname,&fileinfo)) { + pam_syslog(pamh,LOG_ERR, "Couldn't open %s",ifname); + free(ifname); + return onerr; + } + + if((fileinfo.st_mode & S_IWOTH) + || !S_ISREG(fileinfo.st_mode)) { + /* If the file is world writable or is not a + normal file, return error */ + pam_syslog(pamh,LOG_ERR, + "%s is either world writable or not a normal file", + ifname); + free(ifname); + return PAM_AUTH_ERR; + } + + inf = fopen(ifname,"r"); + if(inf == NULL) { /* Check that we opened it successfully */ + if (onerr == PAM_SERVICE_ERR) { + /* Only report if it's an error... */ + pam_syslog(pamh,LOG_ERR, "Error opening %s", ifname); + } + free(ifname); + return onerr; + } + /* There should be no more errors from here on */ + retval=PAM_AUTH_ERR; + /* This loop assumes that PAM_SUCCESS == 0 + and PAM_AUTH_ERR != 0 */ +#ifdef DEBUG + assert(PAM_SUCCESS == 0); + assert(PAM_AUTH_ERR != 0); +#endif + if(extitem == EI_GROUP) { + while((fgets(aline,sizeof(aline),inf) != NULL) + && retval) { + if(strlen(aline) == 0) + continue; + if(aline[strlen(aline) - 1] == '\n') + aline[strlen(aline) - 1] = '\0'; + for(i=0;itemlist[i];) + /* If any of the items match, strcmp() == 0, and we get out + of this loop */ + retval = (strcmp(aline,itemlist[i++]) && retval); + } + for(i=0;itemlist[i];) + free(itemlist[i++]); + } else { + while((fgets(aline,sizeof(aline),inf) != NULL) + && retval) { + char *a = aline; + if(strlen(aline) == 0) + continue; + if(aline[strlen(aline) - 1] == '\n') + aline[strlen(aline) - 1] = '\0'; + if(strlen(aline) == 0) + continue; + if(aline[strlen(aline) - 1] == '\r') + aline[strlen(aline) - 1] = '\0'; + if(citem == PAM_TTY) + if(strncmp(a, "/dev/", 5) == 0) + a += 5; + retval = strcmp(a,citemp); + } + } + fclose(inf); + free(ifname); + if ((sense && retval) || (!sense && !retval)) { +#ifdef DEBUG + pam_syslog(pamh,LOG_INFO, + "Returning PAM_SUCCESS, retval = %d", retval); +#endif + return PAM_SUCCESS; + } + else { + const void *service; + const char *user_name; +#ifdef DEBUG + pam_syslog(pamh,LOG_INFO, + "Returning PAM_AUTH_ERR, retval = %d", retval); +#endif + (void) pam_get_item(pamh, PAM_SERVICE, &service); + (void) pam_get_user(pamh, &user_name, NULL); + if (!quiet) + pam_syslog (pamh, LOG_ALERT, "Refused user %s for service %s", + user_name, (const char *)service); + return PAM_AUTH_ERR; + } +} + +PAM_EXTERN int +pam_sm_setcred (pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_SUCCESS; +} + +PAM_EXTERN int +pam_sm_acct_mgmt (pam_handle_t *pamh, int flags, + int argc, const char **argv) +{ + return pam_sm_authenticate(pamh, flags, argc, argv); +} + +PAM_EXTERN int +pam_sm_open_session (pam_handle_t *pamh, int flags, + int argc, const char **argv) +{ + return pam_sm_authenticate(pamh, flags, argc, argv); +} + +PAM_EXTERN int +pam_sm_close_session (pam_handle_t *pamh, int flags, + int argc, const char **argv) +{ + return pam_sm_authenticate(pamh, flags, argc, argv); +} + +PAM_EXTERN int +pam_sm_chauthtok (pam_handle_t *pamh, int flags, + int argc, const char **argv) +{ + return pam_sm_authenticate(pamh, flags, argc, argv); +} + +#ifdef PAM_STATIC + +/* static module data */ + +struct pam_module _pam_listfile_modstruct = { + "pam_listfile", + pam_sm_authenticate, + pam_sm_setcred, + pam_sm_acct_mgmt, + pam_sm_open_session, + pam_sm_close_session, + pam_sm_chauthtok, +}; + +#endif /* PAM_STATIC */ + +/* end of module definition */ diff --git a/modules/pam_listfile/tst-pam_listfile b/modules/pam_listfile/tst-pam_listfile new file mode 100755 index 00000000..f555a9f5 --- /dev/null +++ b/modules/pam_listfile/tst-pam_listfile @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_listfile.so diff --git a/modules/pam_localuser/Makefile.am b/modules/pam_localuser/Makefile.am new file mode 100644 index 00000000..d4e47937 --- /dev/null +++ b/modules/pam_localuser/Makefile.am @@ -0,0 +1,31 @@ +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README ${MANS} $(XMLS) tst-pam_localuser + +TESTS = tst-pam_localuser + +man_MANS = pam_localuser.8 +XMLS = README.xml pam_localuser.8.xml + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_localuser.la +pam_localuser_la_LIBADD = -L$(top_builddir)/libpam -lpam + +if ENABLE_REGENERATE_MAN +noinst_DATA = README +README: pam_localuser.8.xml +-include $(top_srcdir)/Make.xml.rules +endif + diff --git a/modules/pam_localuser/Makefile.in b/modules/pam_localuser/Makefile.in new file mode 100644 index 00000000..c87af7b9 --- /dev/null +++ b/modules/pam_localuser/Makefile.in @@ -0,0 +1,667 @@ +# Makefile.in generated by automake 1.10.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY, to the extent permitted by law; without +# even the implied warranty of MERCHANTABILITY or FITNESS FOR A +# PARTICULAR PURPOSE. + +@SET_MAKE@ + +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + + +VPATH = @srcdir@ +pkgdatadir = $(datadir)/@PACKAGE@ +pkglibdir = $(libdir)/@PACKAGE@ +pkgincludedir = $(includedir)/@PACKAGE@ +am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd +install_sh_DATA = $(install_sh) -c -m 644 +install_sh_PROGRAM = $(install_sh) -c +install_sh_SCRIPT = $(install_sh) -c +INSTALL_HEADER = $(INSTALL_DATA) +transform = $(program_transform_name) +NORMAL_INSTALL = : +PRE_INSTALL = : +POST_INSTALL = : +NORMAL_UNINSTALL = : +PRE_UNINSTALL = : +POST_UNINSTALL = : +build_triplet = @build@ +host_triplet = @host@ +@HAVE_VERSIONING_TRUE@am__append_1 = -Wl,--version-script=$(srcdir)/../modules.map +subdir = modules/pam_localuser +DIST_COMMON = README $(srcdir)/Makefile.am $(srcdir)/Makefile.in +ACLOCAL_M4 = $(top_srcdir)/aclocal.m4 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distclean-libtool distclean-tags distdir dvi dvi-am html \ + html-am info info-am install install-am install-data \ + install-data-am install-dvi install-dvi-am install-exec \ + install-exec-am install-html install-html-am install-info \ + install-info-am install-man install-man8 install-pdf \ + install-pdf-am install-ps install-ps-am \ + install-securelibLTLIBRARIES install-strip installcheck \ + installcheck-am installdirs maintainer-clean \ + maintainer-clean-generic mostlyclean mostlyclean-compile \ + mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \ + tags uninstall uninstall-am uninstall-man uninstall-man8 \ + uninstall-securelibLTLIBRARIES + +@ENABLE_REGENERATE_MAN_TRUE@README: pam_localuser.8.xml +@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_localuser/README b/modules/pam_localuser/README new file mode 100644 index 00000000..50663ead --- /dev/null +++ b/modules/pam_localuser/README @@ -0,0 +1,38 @@ +pam_localuser — require users to be listed in /etc/passwd + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +pam_localuser is a PAM module to help implementing site-wide login policies, +where they typically include a subset of the network's users and a few accounts +that are local to a particular workstation. Using pam_localuser and pam_wheel +or pam_listfile is an effective way to restrict access to either local users +and/or a subset of the network's users. + +This could also be implemented using pam_listfile.so and a very short awk +script invoked by cron, but it's common enough to have been separated out. + +OPTIONS + +debug + + Print debug information. + +file=/path/passwd + + Use a file other than /etc/passwd. + +EXAMPLES + +Add the following line to /etc/pam.d/su to allow only local users in group +wheel to use su. + +account sufficient pam_localuser.so +account required pam_wheel.so + + +AUTHOR + +pam_localuser was written by Nalin Dahyabhai <nalin@redhat.com>. + diff --git a/modules/pam_localuser/README.xml b/modules/pam_localuser/README.xml new file mode 100644 index 00000000..4ab56d9d --- /dev/null +++ b/modules/pam_localuser/README.xml @@ -0,0 +1,41 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_localuser.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_localuser.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_localuser-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_localuser.8.xml" xpointer='xpointer(//refsect1[@id = "pam_localuser-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_localuser.8.xml" xpointer='xpointer(//refsect1[@id = "pam_localuser-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_localuser.8.xml" xpointer='xpointer(//refsect1[@id = "pam_localuser-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_localuser.8.xml" xpointer='xpointer(//refsect1[@id = "pam_localuser-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_localuser/pam_localuser.8 b/modules/pam_localuser/pam_localuser.8 new file mode 100644 index 00000000..49dce02c --- /dev/null +++ b/modules/pam_localuser/pam_localuser.8 @@ -0,0 +1,88 @@ +.\" Title: pam_localuser +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_LOCALUSER" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_localuser - require users to be listed in /etc/passwd +.SH "SYNOPSIS" +.HP 17 +\fBpam_localuser\.so\fR [debug] [file=\fI/path/passwd\fR] +.SH "DESCRIPTION" +.PP +pam_localuser is a PAM module to help implementing site\-wide login policies, where they typically include a subset of the network\'s users and a few accounts that are local to a particular workstation\. Using pam_localuser and pam_wheel or pam_listfile is an effective way to restrict access to either local users and/or a subset of the network\'s users\. +.PP +This could also be implemented using pam_listfile\.so and a very short awk script invoked by cron, but it\'s common enough to have been separated out\. +.SH "OPTIONS" +.PP +.PP +\fBdebug\fR +.RS 4 +Print debug information\. +.RE +.PP +\fBfile=\fR\fB\fI/path/passwd\fR\fR +.RS 4 +Use a file other than +\fI/etc/passwd\fR\. +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +All services (\fBaccount\fR, +\fBauth\fR, +\fBpassword\fR +and +\fBsession\fR) are supported\. +.SH "RETURN VALUES" +.PP +.PP +PAM_SUCCESS +.RS 4 +The new localuser was set successfull\. +.RE +.PP +PAM_SERVICE_ERR +.RS 4 +No username was given\. +.RE +.PP +PAM_USER_UNKNOWN +.RS 4 +User not known\. +.RE +.SH "EXAMPLES" +.PP +Add the following line to +\fI/etc/pam\.d/su\fR +to allow only local users in group wheel to use su\. +.sp +.RS 4 +.nf +account sufficient pam_localuser\.so +account required pam_wheel\.so + +.fi +.RE +.sp +.SH "FILES" +.PP +\fI/etc/passwd\fR +.RS 4 +Local user account information\. +.RE +.SH "SEE ALSO" +.PP + +\fBpam.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_localuser was written by Nalin Dahyabhai <nalin@redhat\.com>\. diff --git a/modules/pam_localuser/pam_localuser.8.xml b/modules/pam_localuser/pam_localuser.8.xml new file mode 100644 index 00000000..ac00ce99 --- /dev/null +++ b/modules/pam_localuser/pam_localuser.8.xml @@ -0,0 +1,173 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_localuser"> + + <refmeta> + <refentrytitle>pam_localuser</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_localuser-name"> + <refname>pam_localuser</refname> + <refpurpose>require users to be listed in /etc/passwd</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_localuser-cmdsynopsis"> + <command>pam_localuser.so</command> + <arg choice="opt"> + debug + </arg> + <arg choice="opt"> + file=<replaceable>/path/passwd</replaceable> + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_localuser-description"> + + <title>DESCRIPTION</title> + + <para> + pam_localuser is a PAM module to help implementing site-wide login + policies, where they typically include a subset of the network's + users and a few accounts that are local to a particular workstation. + Using pam_localuser and pam_wheel or pam_listfile is an effective + way to restrict access to either local users and/or a subset of the + network's users. + </para> + <para> + This could also be implemented using pam_listfile.so and a very + short awk script invoked by cron, but it's common enough to have + been separated out. + </para> + + </refsect1> + + <refsect1 id="pam_localuser-options"> + + <title>OPTIONS</title> + <para> + <variablelist> + + <varlistentry> + <term> + <option>debug</option> + </term> + <listitem> + <para> + Print debug information. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>file=<replaceable>/path/passwd</replaceable></option> + </term> + <listitem> + <para> + Use a file other than <filename>/etc/passwd</filename>. + </para> + </listitem> + </varlistentry> + + </variablelist> + + </para> + </refsect1> + + <refsect1 id="pam_localuser-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + All services (<option>account</option>, <option>auth</option>, + <option>password</option> and <option>session</option>) are supported. + </para> + </refsect1> + + <refsect1 id='pam_localuser-return_values'> + <title>RETURN VALUES</title> + <para> + <variablelist> + + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + The new localuser was set successfull. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_SERVICE_ERR</term> + <listitem> + <para> + No username was given. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_USER_UNKNOWN</term> + <listitem> + <para> + User not known. + </para> + </listitem> + </varlistentry> + + </variablelist> + </para> + </refsect1> + + <refsect1 id='pam_localuser-examples'> + <title>EXAMPLES</title> + <para> + Add the following line to <filename>/etc/pam.d/su</filename> to + allow only local users in group wheel to use su. + <programlisting> +account sufficient pam_localuser.so +account required pam_wheel.so + </programlisting> + </para> + </refsect1> + + <refsect1 id="pam_localuser-files"> + <title>FILES</title> + <variablelist> + <varlistentry> + <term><filename>/etc/passwd</filename></term> + <listitem> + <para>Local user account information.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id='pam_localuser-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_localuser-author'> + <title>AUTHOR</title> + <para> + pam_localuser was written by Nalin Dahyabhai <nalin@redhat.com>. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_localuser/pam_localuser.c b/modules/pam_localuser/pam_localuser.c new file mode 100644 index 00000000..aa43bc4c --- /dev/null +++ b/modules/pam_localuser/pam_localuser.c @@ -0,0 +1,174 @@ +/* + * Copyright 2001, 2004 Red Hat, Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, and the entire permission notice in its entirety, + * including the disclaimer of warranties. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * ALTERNATIVELY, this product may be distributed under the terms of + * the GNU Public License, in which case the provisions of the GPL are + * required INSTEAD OF the above restrictions. (This clause is + * necessary due to a potential bad interaction between the GPL and + * the restrictions contained in a BSD-style copyright.) + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include "config.h" + +#include <errno.h> +#include <limits.h> +#include <stdlib.h> +#include <string.h> +#include <syslog.h> +#include <stdio.h> +#include <stdarg.h> +#include <time.h> +#include <unistd.h> +#include <sys/stat.h> +#include <sys/types.h> + +#define PAM_SM_AUTH +#define PAM_SM_ACCOUNT +#include <security/pam_modules.h> +#include <security/_pam_macros.h> +#include <security/pam_ext.h> + +#define MODULE_NAME "pam_localuser" + +PAM_EXTERN int +pam_sm_authenticate (pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + int i, ret = PAM_SUCCESS; + FILE *fp; + int debug = 0; + const char *filename = "/etc/passwd"; + char line[LINE_MAX], name[LINE_MAX]; + const char* user; + + /* process arguments */ + for(i = 0; i < argc; i++) { + if(strcmp("debug", argv[i]) == 0) { + debug = 1; + } + } + for(i = 0; i < argc; i++) { + if(strncmp("file=", argv[i], 5) == 0) { + filename = argv[i] + 5; + if(debug) { + pam_syslog (pamh, LOG_DEBUG, + "set filename to \"%s\"", + filename); + } + } + } + + /* open the file */ + fp = fopen(filename, "r"); + if(fp == NULL) { + pam_syslog (pamh, LOG_ERR, "error opening \"%s\": %m", + filename); + return PAM_SYSTEM_ERR; + } + + if(pam_get_user(pamh, &user, NULL) != PAM_SUCCESS) { + pam_syslog (pamh, LOG_ERR, "user name not specified yet"); + fclose(fp); + return PAM_SYSTEM_ERR; + } + + if ((user == NULL) || (strlen(user) == 0)) { + pam_syslog (pamh, LOG_ERR, "user name not valid"); + fclose(fp); + return PAM_SYSTEM_ERR; + } + + /* scan the file, using fgets() instead of fgetpwent() because i + * don't want to mess with applications which call fgetpwent() */ + ret = PAM_PERM_DENIED; + snprintf(name, sizeof(name), "%s:", user); + i = strlen(name); + while(fgets(line, sizeof(line), fp) != NULL) { + if(debug) { + pam_syslog (pamh, LOG_DEBUG, "checking \"%s\"", line); + } + if(strncmp(name, line, i) == 0) { + ret = PAM_SUCCESS; + break; + } + } + + /* okay, we're done */ + fclose(fp); + return ret; +} + +PAM_EXTERN int +pam_sm_setcred (pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_SUCCESS; +} + +PAM_EXTERN int +pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, int argc, const char **argv) +{ + return pam_sm_authenticate(pamh, flags, argc, argv); +} + +PAM_EXTERN int +pam_sm_open_session (pam_handle_t *pamh, int flags, + int argc, const char **argv) +{ + return pam_sm_authenticate(pamh, flags, argc, argv); +} + +PAM_EXTERN int +pam_sm_close_session (pam_handle_t *pamh, int flags, + int argc, const char **argv) +{ + return pam_sm_authenticate(pamh, flags, argc, argv); +} + +PAM_EXTERN int +pam_sm_chauthtok (pam_handle_t *pamh, int flags, + int argc, const char **argv) +{ + return pam_sm_authenticate(pamh, flags, argc, argv); +} + +#ifdef PAM_STATIC + +/* static module data */ + +struct pam_module _pam_localuser_modstruct = { + "pam_localuser", + pam_sm_authenticate, + pam_sm_setcred, + pam_sm_acct_mgmt, + pam_sm_open_session, + pam_sm_close_session, + pam_sm_chauthtok +}; + +#endif diff --git a/modules/pam_localuser/tst-pam_localuser b/modules/pam_localuser/tst-pam_localuser new file mode 100755 index 00000000..2bcdf6b9 --- /dev/null +++ b/modules/pam_localuser/tst-pam_localuser @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_localuser.so diff --git a/modules/pam_loginuid/Makefile.am b/modules/pam_loginuid/Makefile.am new file mode 100644 index 00000000..636db963 --- /dev/null +++ b/modules/pam_loginuid/Makefile.am @@ -0,0 +1,34 @@ +# +# Copyright (c) 2006 Thorsten Kukuk <kukuk@thkukuk.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README $(MANS) $(XMLS) tst-pam_loginuid + +man_MANS = pam_loginuid.8 + +XMLS = README.xml pam_loginuid.8.xml + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_loginuid.la +pam_loginuid_la_LIBADD = -L$(top_builddir)/libpam -lpam @LIBAUDIT@ + +if ENABLE_REGENERATE_MAN + +noinst_DATA = README + +README: pam_loginuid.8.xml + +-include $(top_srcdir)/Make.xml.rules +endif + +TESTS = tst-pam_loginuid diff --git a/modules/pam_loginuid/Makefile.in b/modules/pam_loginuid/Makefile.in new file mode 100644 index 00000000..064ef5bc --- /dev/null +++ b/modules/pam_loginuid/Makefile.in @@ -0,0 +1,669 @@ +# Makefile.in generated by automake 1.10.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY, to the extent permitted by law; without +# even the implied warranty of MERCHANTABILITY or FITNESS FOR A +# PARTICULAR PURPOSE. + +@SET_MAKE@ + +# +# Copyright (c) 2006 Thorsten Kukuk <kukuk@thkukuk.de> +# + + +VPATH = @srcdir@ +pkgdatadir = $(datadir)/@PACKAGE@ +pkglibdir = $(libdir)/@PACKAGE@ +pkgincludedir = $(includedir)/@PACKAGE@ +am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd +install_sh_DATA = $(install_sh) -c -m 644 +install_sh_PROGRAM = 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mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \ + tags uninstall uninstall-am uninstall-man uninstall-man8 \ + uninstall-securelibLTLIBRARIES + + +@ENABLE_REGENERATE_MAN_TRUE@README: pam_loginuid.8.xml + +@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_loginuid/README b/modules/pam_loginuid/README new file mode 100644 index 00000000..f07cffeb --- /dev/null +++ b/modules/pam_loginuid/README @@ -0,0 +1,29 @@ +pam_loginuid — Record user's login uid to the process attribute + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +The pam_loginuid module sets the loginuid process attribute for the process +that was authenticated. This is necessary for applications to be correctly +audited. This PAM module should only be used for entry point applications like: +login, sshd, gdm, vsftpd, crond and atd. There are probably other entry point +applications besides these. You should not use it for applications like sudo or +su as that defeats the purpose by changing the loginuid to the account they +just switched to. + +EXAMPLES + +#%PAM-1.0 +auth required pam_unix.so +auth required pam_nologin.so +account required pam_unix.so +password required pam_unix.so +session required pam_unix.so +session required pam_loginuid.so + + +AUTHOR + +pam_loginuid was written by Steve Grubb <sgrubb@redhat.com> + diff --git a/modules/pam_loginuid/README.xml b/modules/pam_loginuid/README.xml new file mode 100644 index 00000000..3bcd38ab --- /dev/null +++ b/modules/pam_loginuid/README.xml @@ -0,0 +1,36 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_loginuid.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_loginuid.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_loginuid-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_loginuid.8.xml" xpointer='xpointer(//refsect1[@id = "pam_loginuid-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_loginuid.8.xml" xpointer='xpointer(//refsect1[@id = "pam_loginuid-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_loginuid.8.xml" xpointer='xpointer(//refsect1[@id = "pam_loginuid-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_loginuid/pam_loginuid.8 b/modules/pam_loginuid/pam_loginuid.8 new file mode 100644 index 00000000..46147c35 --- /dev/null +++ b/modules/pam_loginuid/pam_loginuid.8 @@ -0,0 +1,63 @@ +.\" Title: pam_loginuid +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_LOGINUID" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_loginuid - Record user's login uid to the process attribute +.SH "SYNOPSIS" +.HP 16 +\fBpam_loginuid\.so\fR [require_auditd] +.SH "DESCRIPTION" +.PP +The pam_loginuid module sets the loginuid process attribute for the process that was authenticated\. This is necessary for applications to be correctly audited\. This PAM module should only be used for entry point applications like: login, sshd, gdm, vsftpd, crond and atd\. There are probably other entry point applications besides these\. You should not use it for applications like sudo or su as that defeats the purpose by changing the loginuid to the account they just switched to\. +.SH "OPTIONS" +.PP +\fBrequire_auditd\fR +.RS 4 +This option, when given, will cause this module to query the audit daemon status and deny logins if it is not running\. +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +The +\fBsession\fR +service is supported\. +.SH "RETURN VALUES" +.PP +.PP +PAM_SESSION_ERR +.RS 4 +An error occured during session management\. +.RE +.SH "EXAMPLES" +.sp +.RS 4 +.nf +#%PAM\-1\.0 +auth required pam_unix\.so +auth required pam_nologin\.so +account required pam_unix\.so +password required pam_unix\.so +session required pam_unix\.so +session required pam_loginuid\.so + +.fi +.RE +.SH "SEE ALSO" +.PP + +\fBpam.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8), +\fBauditctl\fR(8), +\fBauditd\fR(8) +.SH "AUTHOR" +.PP +pam_loginuid was written by Steve Grubb <sgrubb@redhat\.com> diff --git a/modules/pam_loginuid/pam_loginuid.8.xml b/modules/pam_loginuid/pam_loginuid.8.xml new file mode 100644 index 00000000..f50336d0 --- /dev/null +++ b/modules/pam_loginuid/pam_loginuid.8.xml @@ -0,0 +1,125 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_loginuid"> + + <refmeta> + <refentrytitle>pam_loginuid</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_loginuid-name"> + <refname>pam_loginuid</refname> + <refpurpose>Record user's login uid to the process attribute</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_loginuid-cmdsynopsis"> + <command>pam_loginuid.so</command> + <arg choice="opt"> + require_auditd + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_loginuid-description"> + + <title>DESCRIPTION</title> + + <para> + The pam_loginuid module sets the loginuid process attribute for the + process that was authenticated. This is necessary for applications + to be correctly audited. This PAM module should only be used for entry + point applications like: login, sshd, gdm, vsftpd, crond and atd. + There are probably other entry point applications besides these. + You should not use it for applications like sudo or su as that + defeats the purpose by changing the loginuid to the account they just + switched to. + </para> + </refsect1> + + <refsect1 id="pam_loginuid-options"> + <title>OPTIONS</title> + <variablelist> + <varlistentry> + <term> + <option>require_auditd</option> + </term> + <listitem> + <para> + This option, when given, will cause this module to query + the audit daemon status and deny logins if it is not running. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_loginuid-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + The <option>session</option> service is supported. + </para> + </refsect1> + + <refsect1 id='pam_loginuid-return_values'> + <title>RETURN VALUES</title> + <para> + <variablelist> + <varlistentry> + <term>PAM_SESSION_ERR</term> + <listitem> + <para> + An error occured during session management. + </para> + </listitem> + </varlistentry> + + </variablelist> + </para> + </refsect1> + + <refsect1 id='pam_loginuid-examples'> + <title>EXAMPLES</title> + <programlisting> +#%PAM-1.0 +auth required pam_unix.so +auth required pam_nologin.so +account required pam_unix.so +password required pam_unix.so +session required pam_unix.so +session required pam_loginuid.so + </programlisting> + </refsect1> + + <refsect1 id='pam_loginuid-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>auditctl</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>auditd</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_loginuid-author'> + <title>AUTHOR</title> + <para> + pam_loginuid was written by Steve Grubb <sgrubb@redhat.com> + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_loginuid/pam_loginuid.c b/modules/pam_loginuid/pam_loginuid.c new file mode 100644 index 00000000..13509e7e --- /dev/null +++ b/modules/pam_loginuid/pam_loginuid.c @@ -0,0 +1,239 @@ +/* pam_loginuid.c -- + * Copyright 2005 Red Hat Inc., Durham, North Carolina. + * All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * Authors: + * Steve Grubb <sgrubb@redhat.com> + * + * PAM module that sets the login uid introduced in kernel 2.6.11 + */ + +#include "config.h" +#include <stdio.h> +#include <stdarg.h> +#include <syslog.h> +#include <string.h> +#include <pwd.h> +#include <unistd.h> +#include <limits.h> +#include <errno.h> + +#include <security/pam_modules.h> +#include <security/pam_ext.h> +#include <security/pam_modutil.h> + +#include <fcntl.h> + +#ifdef HAVE_LIBAUDIT +#include <libaudit.h> +#include <sys/select.h> +#include <errno.h> +#endif + +/* + * This function writes the loginuid to the /proc system. It returns + * 0 on success and 1 on failure. + */ +static int set_loginuid(pam_handle_t *pamh, uid_t uid) +{ + int fd, count, rc = 0; + char loginuid[24]; + + count = snprintf(loginuid, sizeof(loginuid), "%d", uid); + fd = open("/proc/self/loginuid", O_NOFOLLOW|O_WRONLY|O_TRUNC); + if (fd < 0) { + if (errno != ENOENT) { + rc = 1; + pam_syslog(pamh, LOG_ERR, + "Cannot open /proc/self/loginuid: %m"); + } + return rc; + } + if (pam_modutil_write(fd, loginuid, count) != count) + rc = 1; + close(fd); + return rc; +} + +#ifdef HAVE_LIBAUDIT +/* + * This function is called only if "require_auditd" option is passed. It is + * called after loginuid has been set. The purpose is to disallow logins + * should the audit daemon not be running or crashed. It returns PAM_SUCCESS + * if the audit daemon is running and PAM_SESSION_ERR otherwise. + */ +static int check_auditd(void) +{ + int fd, retval; + + fd = audit_open(); + if (fd < 0) { + /* This is here to let people that build their own kernel + and disable the audit system get in. You get these error + codes only when the kernel doesn't have audit + compiled in. */ + if (errno == EINVAL || errno == EPROTONOSUPPORT || + errno == EAFNOSUPPORT) + return PAM_SUCCESS; + return PAM_SESSION_ERR; + } + retval = audit_request_status(fd); + if (retval > 0) { + struct audit_reply rep; + int i; + int timeout = 30; /* tenths of seconds */ + fd_set read_mask; + + FD_ZERO(&read_mask); + FD_SET(fd, &read_mask); + + for (i = 0; i < timeout; i++) { + struct timeval t; + int rc; + + t.tv_sec = 0; + t.tv_usec = 100000; + do { + rc = select(fd+1, &read_mask, NULL, NULL, &t); + } while (rc < 0 && errno == EINTR); + + rc = audit_get_reply(fd, &rep, GET_REPLY_NONBLOCKING,0); + if (rc > 0) { + /* If we get done or error, break out */ + if (rep.type == NLMSG_DONE || + rep.type == NLMSG_ERROR) + break; + + /* If its not status, keep looping */ + if (rep.type != AUDIT_GET) + continue; + + /* Found it... */ + close(fd); + if (rep.status->pid == 0) + return PAM_SESSION_ERR; + else + return PAM_SUCCESS; + } + } + } + close(fd); + if (retval == -ECONNREFUSED) { + /* This is here to let people that build their own kernel + and disable the audit system get in. ECONNREFUSED is + issued by the kernel when there is "no on listening". */ + return PAM_SUCCESS; + } else if (retval == -EPERM && getuid() != 0) { + /* If we get this, then the kernel supports auditing + * but we don't have enough privilege to write to the + * socket. Therefore, we have already been authenticated + * and we are a common user. Just act as though auditing + * is not enabled. Any other error we take seriously. */ + return PAM_SUCCESS; + } + + return PAM_SESSION_ERR; +} +#endif + +/* + * Initialize audit session for user + */ +static int +_pam_loginuid(pam_handle_t *pamh, int flags UNUSED, +#ifdef HAVE_LIBAUDIT + int argc, const char **argv +#else + int argc UNUSED, const char **argv UNUSED +#endif +) +{ + const char *user = NULL; + struct passwd *pwd; +#ifdef HAVE_LIBAUDIT + int require_auditd = 0; +#endif + + /* get user name */ + if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS) + { + pam_syslog(pamh, LOG_ERR, "error recovering login user-name"); + return PAM_SESSION_ERR; + } + + /* get user info */ + if ((pwd = pam_modutil_getpwnam(pamh, user)) == NULL) { + pam_syslog(pamh, LOG_ERR, + "error: login user-name '%s' does not exist", user); + return PAM_SESSION_ERR; + } + + if (set_loginuid(pamh, pwd->pw_uid)) { + pam_syslog(pamh, LOG_ERR, "set_loginuid failed\n"); + return PAM_SESSION_ERR; + } + +#ifdef HAVE_LIBAUDIT + while (argc-- > 0) { + if (strcmp(*argv, "require_auditd") == 0) + require_auditd = 1; + argv++; + } + + if (require_auditd) + return check_auditd(); + else +#endif + return PAM_SUCCESS; +} + +/* + * PAM routines + * + * This is here for vsftpd which doesn't seem to run the session stack + */ +PAM_EXTERN int +pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, int argc, const char **argv) +{ + return _pam_loginuid(pamh, flags, argc, argv); +} + +PAM_EXTERN int +pam_sm_open_session(pam_handle_t *pamh, int flags, int argc, const char **argv) +{ + return _pam_loginuid(pamh, flags, argc, argv); +} + +PAM_EXTERN int +pam_sm_close_session(pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_SUCCESS; +} + +/* static module data */ +#ifdef PAM_STATIC +struct pam_module _pam_loginuid_modstruct = { + "pam_loginuid", + NULL, + NULL, + pam_sm_acct_mgmt, + pam_sm_open_session, + pam_sm_close_session, + NULL +}; +#endif diff --git a/modules/pam_loginuid/tst-pam_loginuid b/modules/pam_loginuid/tst-pam_loginuid new file mode 100755 index 00000000..bd1e83b7 --- /dev/null +++ b/modules/pam_loginuid/tst-pam_loginuid @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_loginuid.so diff --git a/modules/pam_mail/Makefile.am b/modules/pam_mail/Makefile.am new file mode 100644 index 00000000..0b5d2d70 --- /dev/null +++ b/modules/pam_mail/Makefile.am @@ -0,0 +1,31 @@ +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README $(MANS) $(XMLS) tst-pam_mail + +man_MANS = pam_mail.8 +XMLS = README.xml pam_mail.8.xml + +TESTS = tst-pam_mail + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_mail.la +pam_mail_la_LIBADD = -L$(top_builddir)/libpam -lpam + +if ENABLE_REGENERATE_MAN +noinst_DATA = README +README: pam_mail.8.xml +-include $(top_srcdir)/Make.xml.rules +endif + diff --git a/modules/pam_mail/Makefile.in b/modules/pam_mail/Makefile.in new file mode 100644 index 00000000..22e6c9ce --- /dev/null +++ b/modules/pam_mail/Makefile.in @@ -0,0 +1,667 @@ +# Makefile.in generated by automake 1.10.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY, to the extent permitted by law; without +# even the implied warranty of MERCHANTABILITY or FITNESS FOR A +# PARTICULAR PURPOSE. + +@SET_MAKE@ + +# +# Copyright (c) 2005, 2006 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install-ps install-ps-am \ + install-securelibLTLIBRARIES install-strip installcheck \ + installcheck-am installdirs maintainer-clean \ + maintainer-clean-generic mostlyclean mostlyclean-compile \ + mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \ + tags uninstall uninstall-am uninstall-man uninstall-man8 \ + uninstall-securelibLTLIBRARIES + +@ENABLE_REGENERATE_MAN_TRUE@README: pam_mail.8.xml +@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_mail/README b/modules/pam_mail/README new file mode 100644 index 00000000..a0a0b7d9 --- /dev/null +++ b/modules/pam_mail/README @@ -0,0 +1,71 @@ +pam_mail — Inform about available mail + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +The pam_mail PAM module provides the "you have new mail" service to the user. +It can be plugged into any application that has credential or session hooks. It +gives a single message indicating the newness of any mail it finds in the +user's mail folder. This module also sets the PAM environment variable, MAIL, +to the user's mail directory. + +If the mail spool file (be it /var/mail/$USER or a pathname given with the dir= +parameter) is a directory then pam_mail assumes it is in the Maildir format. + +OPTIONS + +close + + Indicate if the user has any mail also on logout. + +debug + + Print debug information. + +dir=maildir + + Look for the users' mail in an alternative location defined by maildir/ + <login>. The default location for mail is /var/mail/<login>. Note, if the + supplied maildir is prefixed by a '~', the directory is interpreted as + indicating a file in the user's home directory. + +empty + + Also print message if user has no mail. + +hash=count + + Mail directory hash depth. For example, a hashcount of 2 would make the + mail file be /var/spool/mail/u/s/user. + +noenv + + Do not set the MAIL environment variable. + +nopen + + Don't print any mail information on login. This flag is useful to get the + MAIL environment variable set, but to not display any information about it. + +quiet + + Only report when there is new mail. + +standard + + Old style "You have..." format which doesn't show the mail spool being + used. This also implies "empty". + +EXAMPLES + +Add the following line to /etc/pam.d/login to indicate that the user has new +mail when they login to the system. + +session optional pam_mail.so standard + + +AUTHOR + +pam_mail was written by Andrew G. Morgan <morgan@kernel.org>. + diff --git a/modules/pam_mail/README.xml b/modules/pam_mail/README.xml new file mode 100644 index 00000000..4165d857 --- /dev/null +++ b/modules/pam_mail/README.xml @@ -0,0 +1,41 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_mail.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_mail.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_mail-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_mail.8.xml" xpointer='xpointer(//refsect1[@id = "pam_mail-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_mail.8.xml" xpointer='xpointer(//refsect1[@id = "pam_mail-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_mail.8.xml" xpointer='xpointer(//refsect1[@id = "pam_mail-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_mail.8.xml" xpointer='xpointer(//refsect1[@id = "pam_mail-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_mail/pam_mail.8 b/modules/pam_mail/pam_mail.8 new file mode 100644 index 00000000..0d067894 --- /dev/null +++ b/modules/pam_mail/pam_mail.8 @@ -0,0 +1,139 @@ +.\" Title: pam_mail +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_MAIL" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_mail - Inform about available mail +.SH "SYNOPSIS" +.HP 12 +\fBpam_mail\.so\fR [close] [debug] [dir=\fImaildir\fR] [empty] [hash=\fIcount\fR] [noenv] [nopen] [quit] [standard] +.SH "DESCRIPTION" +.PP +The pam_mail PAM module provides the "you have new mail" service to the user\. It can be plugged into any application that has credential or session hooks\. It gives a single message indicating the +\fInewness\fR +of any mail it finds in the user\'s mail folder\. This module also sets the PAM environment variable, +\fBMAIL\fR, to the user\'s mail directory\. +.PP +If the mail spool file (be it +\fI/var/mail/$USER\fR +or a pathname given with the +\fBdir=\fR +parameter) is a directory then pam_mail assumes it is in the +\fIMaildir\fR +format\. +.SH "OPTIONS" +.PP +.PP +\fBclose\fR +.RS 4 +Indicate if the user has any mail also on logout\. +.RE +.PP +\fBdebug\fR +.RS 4 +Print debug information\. +.RE +.PP +\fBdir=\fR\fB\fImaildir\fR\fR +.RS 4 +Look for the users\' mail in an alternative location defined by +\fImaildir/<login>\fR\. The default location for mail is +\fI/var/mail/<login>\fR\. Note, if the supplied +\fImaildir\fR +is prefixed by a \'~\', the directory is interpreted as indicating a file in the user\'s home directory\. +.RE +.PP +\fBempty\fR +.RS 4 +Also print message if user has no mail\. +.RE +.PP +\fBhash=\fR\fB\fIcount\fR\fR +.RS 4 +Mail directory hash depth\. For example, a +\fIhashcount\fR +of 2 would make the mail file be +\fI/var/spool/mail/u/s/user\fR\. +.RE +.PP +\fBnoenv\fR +.RS 4 +Do not set the +\fBMAIL\fR +environment variable\. +.RE +.PP +\fBnopen\fR +.RS 4 +Don\'t print any mail information on login\. This flag is useful to get the +\fBMAIL\fR +environment variable set, but to not display any information about it\. +.RE +.PP +\fBquiet\fR +.RS 4 +Only report when there is new mail\. +.RE +.PP +\fBstandard\fR +.RS 4 +Old style "You have\.\.\." format which doesn\'t show the mail spool being used\. This also implies "empty"\. +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +The +\fBauth\fR +and +\fBaccount\fR +services are supported\. +.SH "RETURN VALUES" +.PP +PAM_BUF_ERR +.RS 4 +Memory buffer error\. +.RE +.PP +PAM_SERVICE_ERR +.RS 4 +Badly formed arguments\. +.RE +.PP +PAM_SUCCESS +.RS 4 +Success\. +.RE +.PP +PAM_USER_UNKNOWN +.RS 4 +User not known\. +.RE +.SH "EXAMPLES" +.PP +Add the following line to +\fI/etc/pam\.d/login\fR +to indicate that the user has new mail when they login to the system\. +.sp +.RS 4 +.nf +session optional pam_mail\.so standard + +.fi +.RE +.sp +.SH "SEE ALSO" +.PP + +\fBpam.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_mail was written by Andrew G\. Morgan <morgan@kernel\.org>\. diff --git a/modules/pam_mail/pam_mail.8.xml b/modules/pam_mail/pam_mail.8.xml new file mode 100644 index 00000000..d3c481a5 --- /dev/null +++ b/modules/pam_mail/pam_mail.8.xml @@ -0,0 +1,279 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_mail"> + + <refmeta> + <refentrytitle>pam_mail</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_mail-name"> + <refname>pam_mail</refname> + <refpurpose>Inform about available mail</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_mail-cmdsynopsis"> + <command>pam_mail.so</command> + <arg choice="opt"> + close + </arg> + <arg choice="opt"> + debug + </arg> + <arg choice="opt"> + dir=<replaceable>maildir</replaceable> + </arg> + <arg choice="opt"> + empty + </arg> + <arg choice="opt"> + hash=<replaceable>count</replaceable> + </arg> + <arg choice="opt"> + noenv + </arg> + <arg choice="opt"> + nopen + </arg> + <arg choice="opt"> + quit + </arg> + <arg choice="opt"> + standard + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_mail-description"> + + <title>DESCRIPTION</title> + + <para> + The pam_mail PAM module provides the "you have new mail" + service to the user. It can be plugged into any application + that has credential or session hooks. It gives a single message + indicating the <emphasis>newness</emphasis> of any mail it finds + in the user's mail folder. This module also sets the PAM + environment variable, <emphasis remap='B'>MAIL</emphasis>, to the + user's mail directory. + </para> + <para> + If the mail spool file (be it <filename>/var/mail/$USER</filename> + or a pathname given with the <option>dir=</option> parameter) is + a directory then pam_mail assumes it is in the + <emphasis remap='I'>Maildir</emphasis> format. + </para> + </refsect1> + + <refsect1 id="pam_mail-options"> + + <title>OPTIONS</title> + <para> + <variablelist> + + <varlistentry> + <term> + <option>close</option> + </term> + <listitem> + <para> + Indicate if the user has any mail also on logout. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>debug</option> + </term> + <listitem> + <para> + Print debug information. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>dir=<replaceable>maildir</replaceable></option> + </term> + <listitem> + <para> + Look for the users' mail in an alternative location defined by + <filename>maildir/<login></filename>. The default + location for mail is <filename>/var/mail/<login></filename>. + Note, if the supplied + <filename>maildir</filename> is prefixed by a '~', the + directory is interpreted as indicating a file in the user's + home directory. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>empty</option> + </term> + <listitem> + <para> + Also print message if user has no mail. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>hash=<replaceable>count</replaceable></option> + </term> + <listitem> + <para> + Mail directory hash depth. For example, a + <emphasis>hashcount</emphasis> of 2 would + make the mail file be + <filename>/var/spool/mail/u/s/user</filename>. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>noenv</option> + </term> + <listitem> + <para> + Do not set the <emphasis remap='B'>MAIL</emphasis> + environment variable. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>nopen</option> + </term> + <listitem> + <para> + Don't print any mail information on login. This flag is + useful to get the <emphasis remap='B'>MAIL</emphasis> + environment variable set, but to not display any information + about it. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>quiet</option> + </term> + <listitem> + <para> + Only report when there is new mail. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>standard</option> + </term> + <listitem> + <para> + Old style "You have..." format which doesn't show the + mail spool being used. This also implies "empty". + </para> + </listitem> + </varlistentry> + + </variablelist> + + </para> + </refsect1> + + <refsect1 id="pam_mail-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + The <emphasis remap='B'>auth</emphasis> and + <emphasis remap='B'>account</emphasis> services are supported. + </para> + </refsect1> + + <refsect1 id='pam_mail-return_values'> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_BUF_ERR</term> + <listitem> + <para> + Memory buffer error. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_SERVICE_ERR</term> + <listitem> + <para> + Badly formed arguments. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + Success. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_USER_UNKNOWN</term> + <listitem> + <para> + User not known. + </para> + </listitem> + </varlistentry> + + </variablelist> + </refsect1> + + <refsect1 id='pam_mail-examples'> + <title>EXAMPLES</title> + <para> + Add the following line to <filename>/etc/pam.d/login</filename> to + indicate that the user has new mail when they login to the system. + <programlisting> +session optional pam_mail.so standard + </programlisting> + </para> + </refsect1> + + <refsect1 id='pam_mail-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_mail-author'> + <title>AUTHOR</title> + <para> + pam_mail was written by Andrew G. Morgan <morgan@kernel.org>. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_mail/pam_mail.c b/modules/pam_mail/pam_mail.c new file mode 100644 index 00000000..46395b53 --- /dev/null +++ b/modules/pam_mail/pam_mail.c @@ -0,0 +1,489 @@ +/* pam_mail module */ + +/* + * Written by Andrew Morgan <morgan@linux.kernel.org> 1996/3/11 + * $HOME additions by David Kinchlea <kinch@kinch.ark.com> 1997/1/7 + * mailhash additions by Chris Adams <cadams@ro.com> 1998/7/11 + */ + +#include "config.h" + +#include <ctype.h> +#include <pwd.h> +#include <stdarg.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <syslog.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <unistd.h> +#include <dirent.h> +#include <errno.h> + +#ifdef HAVE_PATHS_H +#include <paths.h> +#endif + +#define DEFAULT_MAIL_DIRECTORY PAM_PATH_MAILDIR +#define MAIL_FILE_FORMAT "%s%s/%s" +#define MAIL_ENV_NAME "MAIL" +#define MAIL_ENV_FORMAT MAIL_ENV_NAME "=%s" + +/* + * here, we make a definition for the externally accessible function + * in this file (this definition is required for static a module + * but strongly encouraged generally) it is used to instruct the + * modules include file to define the function prototypes. + */ + +#define PAM_SM_SESSION +#define PAM_SM_AUTH + +#include <security/pam_modules.h> +#include <security/_pam_macros.h> +#include <security/pam_modutil.h> +#include <security/pam_ext.h> + +/* argument parsing */ + +#define PAM_DEBUG_ARG 0x0001 +#define PAM_NO_LOGIN 0x0002 +#define PAM_LOGOUT_TOO 0x0004 +#define PAM_NEW_MAIL_DIR 0x0010 +#define PAM_MAIL_SILENT 0x0020 +#define PAM_NO_ENV 0x0040 +#define PAM_HOME_MAIL 0x0100 +#define PAM_EMPTY_TOO 0x0200 +#define PAM_STANDARD_MAIL 0x0400 +#define PAM_QUIET_MAIL 0x1000 + +#define HAVE_NEW_MAIL 0x1 +#define HAVE_OLD_MAIL 0x2 +#define HAVE_NO_MAIL 0x3 +#define HAVE_MAIL 0x4 + +static int +_pam_parse (const pam_handle_t *pamh, int flags, int argc, + const char **argv, const char **maildir, size_t *hashcount) +{ + int ctrl=0; + + if (flags & PAM_SILENT) { + ctrl |= PAM_MAIL_SILENT; + } + + *hashcount = 0; + + /* step through arguments */ + for (; argc-- > 0; ++argv) { + + /* generic options */ + + if (!strcmp(*argv,"debug")) + ctrl |= PAM_DEBUG_ARG; + else if (!strcmp(*argv,"quiet")) + ctrl |= PAM_QUIET_MAIL; + else if (!strcmp(*argv,"standard")) + ctrl |= PAM_STANDARD_MAIL | PAM_EMPTY_TOO; + else if (!strncmp(*argv,"dir=",4)) { + *maildir = 4 + *argv; + if (**maildir != '\0') { + D(("new mail directory: %s", *maildir)); + ctrl |= PAM_NEW_MAIL_DIR; + } else { + pam_syslog(pamh, LOG_ERR, + "dir= specification missing argument - ignored"); + } + } else if (!strncmp(*argv,"hash=",5)) { + char *ep = NULL; + *hashcount = strtoul(*argv+5,&ep,10); + if (!ep) { + *hashcount = 0; + } + } else if (!strcmp(*argv,"close")) { + ctrl |= PAM_LOGOUT_TOO; + } else if (!strcmp(*argv,"nopen")) { + ctrl |= PAM_NO_LOGIN; + } else if (!strcmp(*argv,"noenv")) { + ctrl |= PAM_NO_ENV; + } else if (!strcmp(*argv,"empty")) { + ctrl |= PAM_EMPTY_TOO; + } else { + pam_syslog(pamh, LOG_ERR, "unknown option: %s", *argv); + } + } + + if ((*hashcount != 0) && !(ctrl & PAM_NEW_MAIL_DIR)) { + *maildir = DEFAULT_MAIL_DIRECTORY; + ctrl |= PAM_NEW_MAIL_DIR; + } + + return ctrl; +} + +static int +get_folder(pam_handle_t *pamh, int ctrl, + const char *path_mail, char **folder_p, size_t hashcount) +{ + int retval; + const char *user, *path; + char *folder = NULL; + const struct passwd *pwd = NULL; + + retval = pam_get_user(pamh, &user, NULL); + if (retval != PAM_SUCCESS || user == NULL) { + pam_syslog(pamh, LOG_ERR, "cannot determine username"); + retval = PAM_USER_UNKNOWN; + goto get_folder_cleanup; + } + + if (ctrl & PAM_NEW_MAIL_DIR) { + path = path_mail; + if (*path == '~') { /* support for $HOME delivery */ + pwd = pam_modutil_getpwnam(pamh, user); + if (pwd == NULL) { + pam_syslog(pamh, LOG_ERR, "user unknown"); + retval = PAM_USER_UNKNOWN; + goto get_folder_cleanup; + } + /* + * "~/xxx" and "~xxx" are treated as same + */ + if (!*++path || (*path == '/' && !*++path)) { + pam_syslog(pamh, LOG_ERR, + "badly formed mail path [%s]", path_mail); + retval = PAM_SERVICE_ERR; + goto get_folder_cleanup; + } + ctrl |= PAM_HOME_MAIL; + if (hashcount != 0) { + pam_syslog(pamh, LOG_ERR, + "cannot do hash= and home directory mail"); + } + } + } else { + path = DEFAULT_MAIL_DIRECTORY; + } + + /* put folder together */ + + hashcount = hashcount < strlen(user) ? hashcount : strlen(user); + + retval = PAM_BUF_ERR; + if (ctrl & PAM_HOME_MAIL) { + if (pwd == NULL) { + pwd = pam_modutil_getpwnam(pamh, user); + if (pwd == NULL) { + pam_syslog(pamh, LOG_ERR, "user unknown"); + retval = PAM_USER_UNKNOWN; + goto get_folder_cleanup; + } + } + if (asprintf(&folder, MAIL_FILE_FORMAT, pwd->pw_dir, "", path) < 0) + goto get_folder_cleanup; + } else { + int rc; + size_t i; + char *hash; + + if ((hash = malloc(2 * hashcount + 1)) == NULL) + goto get_folder_cleanup; + + for (i = 0; i < hashcount; i++) { + hash[2 * i] = '/'; + hash[2 * i + 1] = user[i]; + } + hash[2 * i] = '\0'; + + rc = asprintf(&folder, MAIL_FILE_FORMAT, path, hash, user); + _pam_overwrite(hash); + _pam_drop(hash); + if (rc < 0) + goto get_folder_cleanup; + } + D(("folder=[%s]", folder)); + retval = PAM_SUCCESS; + + /* tidy up */ + + get_folder_cleanup: + user = NULL; + path = NULL; + + *folder_p = folder; + folder = NULL; + + if (retval == PAM_BUF_ERR) + pam_syslog(pamh, LOG_CRIT, "out of memory for mail folder"); + + return retval; +} + +static int +get_mail_status(pam_handle_t *pamh, int ctrl, const char *folder) +{ + int type = 0; + struct stat mail_st; + + if (stat(folder, &mail_st) < 0) + return 0; + + if (S_ISDIR(mail_st.st_mode)) { /* Assume Maildir format */ + int i, save_errno; + char *dir; + struct dirent **namelist; + + if (asprintf(&dir, "%s/new", folder) < 0) { + pam_syslog(pamh, LOG_CRIT, "out of memory"); + goto get_mail_status_cleanup; + } + i = scandir(dir, &namelist, 0, alphasort); + save_errno = errno; + _pam_overwrite(dir); + _pam_drop(dir); + if (i < 0) { + type = 0; + namelist = NULL; + if (save_errno == ENOMEM) { + pam_syslog(pamh, LOG_CRIT, "out of memory"); + goto get_mail_status_cleanup; + } + } + type = (i > 2) ? HAVE_NEW_MAIL : 0; + while (--i >= 0) + _pam_drop(namelist[i]); + _pam_drop(namelist); + if (type == 0) { + if (asprintf(&dir, "%s/cur", folder) < 0) { + pam_syslog(pamh, LOG_CRIT, "out of memory"); + goto get_mail_status_cleanup; + } + i = scandir(dir, &namelist, 0, alphasort); + save_errno = errno; + _pam_overwrite(dir); + _pam_drop(dir); + if (i < 0) { + type = 0; + namelist = NULL; + if (save_errno == ENOMEM) { + pam_syslog(pamh, LOG_CRIT, "out of memory"); + goto get_mail_status_cleanup; + } + } + if (i > 2) + type = HAVE_OLD_MAIL; + else + type = (ctrl & PAM_EMPTY_TOO) ? HAVE_NO_MAIL : 0; + while (--i >= 0) + _pam_drop(namelist[i]); + _pam_drop(namelist); + } + } else { + if (mail_st.st_size > 0) { + if (mail_st.st_atime < mail_st.st_mtime) /* new */ + type = HAVE_NEW_MAIL; + else /* old */ + type = (ctrl & PAM_STANDARD_MAIL) ? HAVE_MAIL : HAVE_OLD_MAIL; + } else if (ctrl & PAM_EMPTY_TOO) { + type = HAVE_NO_MAIL; + } else { + type = 0; + } + } + + get_mail_status_cleanup: + memset(&mail_st, 0, sizeof(mail_st)); + D(("user has %d mail in %s folder", type, folder)); + return type; +} + +static int +report_mail(pam_handle_t *pamh, int ctrl, int type, const char *folder) +{ + int retval; + + if (!(ctrl & PAM_MAIL_SILENT) || + ((ctrl & PAM_QUIET_MAIL) && type == HAVE_NEW_MAIL)) + { + if (ctrl & PAM_STANDARD_MAIL) + switch (type) + { + case HAVE_NO_MAIL: + retval = pam_info (pamh, "%s", _("No mail.")); + break; + case HAVE_NEW_MAIL: + retval = pam_info (pamh, "%s", _("You have new mail.")); + break; + case HAVE_OLD_MAIL: + retval = pam_info (pamh, "%s", _("You have old mail.")); + break; + case HAVE_MAIL: + default: + retval = pam_info (pamh, "%s", _("You have mail.")); + break; + } + else + switch (type) + { + case HAVE_NO_MAIL: + retval = pam_info (pamh, _("You have no mail in folder %s."), + folder); + break; + case HAVE_NEW_MAIL: + retval = pam_info (pamh, _("You have new mail in folder %s."), + folder); + break; + case HAVE_OLD_MAIL: + retval = pam_info (pamh, _("You have old mail in folder %s."), + folder); + break; + case HAVE_MAIL: + default: + retval = pam_info (pamh, _("You have mail in folder %s."), + folder); + break; + } + } + else + { + D(("keeping quiet")); + retval = PAM_SUCCESS; + } + + D(("returning %s", pam_strerror(pamh, retval))); + return retval; +} + +static int _do_mail(pam_handle_t *, int, int, const char **, int); + +/* --- authentication functions --- */ + +PAM_EXTERN int +pam_sm_authenticate (pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_IGNORE; +} + +/* Checking mail as part of authentication */ +PAM_EXTERN +int pam_sm_setcred(pam_handle_t *pamh, int flags, int argc, + const char **argv) +{ + if (!(flags & (PAM_ESTABLISH_CRED|PAM_DELETE_CRED))) + return PAM_IGNORE; + return _do_mail(pamh,flags,argc,argv,(flags & PAM_ESTABLISH_CRED)); +} + +/* --- session management functions --- */ + +PAM_EXTERN +int pam_sm_close_session(pam_handle_t *pamh,int flags,int argc + ,const char **argv) +{ + return _do_mail(pamh,flags,argc,argv,0); +} + +/* Checking mail as part of the session management */ +PAM_EXTERN +int pam_sm_open_session(pam_handle_t *pamh, int flags, int argc, + const char **argv) +{ + return _do_mail(pamh,flags,argc,argv,1); +} + + +/* --- The Beaf (Tm) --- */ + +static int _do_mail(pam_handle_t *pamh, int flags, int argc, + const char **argv, int est) +{ + int retval, ctrl, type; + size_t hashcount; + char *folder = NULL; + const char *path_mail = NULL; + + /* + * this module (un)sets the MAIL environment variable, and checks if + * the user has any new mail. + */ + + ctrl = _pam_parse(pamh, flags, argc, argv, &path_mail, &hashcount); + + /* which folder? */ + + retval = get_folder(pamh, ctrl, path_mail, &folder, hashcount); + if (retval != PAM_SUCCESS) { + D(("failed to find folder")); + return retval; + } + + /* set the MAIL variable? */ + + if (!(ctrl & PAM_NO_ENV) && est) { + char *tmp; + + if (asprintf(&tmp, MAIL_ENV_FORMAT, folder) < 0) { + pam_syslog(pamh, LOG_CRIT, + "no memory for " MAIL_ENV_NAME " variable"); + retval = PAM_BUF_ERR; + goto do_mail_cleanup; + } + D(("setting env: %s", tmp)); + retval = pam_putenv(pamh, tmp); + _pam_overwrite(tmp); + _pam_drop(tmp); + if (retval != PAM_SUCCESS) { + pam_syslog(pamh, LOG_CRIT, + "unable to set " MAIL_ENV_NAME " variable"); + retval = PAM_BUF_ERR; + goto do_mail_cleanup; + } + } else { + D(("not setting " MAIL_ENV_NAME " variable")); + } + + /* + * OK. we've got the mail folder... what about its status? + */ + + if ((est && !(ctrl & PAM_NO_LOGIN)) + || (!est && (ctrl & PAM_LOGOUT_TOO))) { + type = get_mail_status(pamh, ctrl, folder); + if (type != 0) { + retval = report_mail(pamh, ctrl, type, folder); + type = 0; + } + } + + /* Delete environment variable? */ + if ( ! est && ! (ctrl & PAM_NO_ENV) ) + (void) pam_putenv(pamh, MAIL_ENV_NAME); + + do_mail_cleanup: + _pam_overwrite(folder); + _pam_drop(folder); + + /* indicate success or failure */ + + return retval; +} + +#ifdef PAM_STATIC + +/* static module data */ + +struct pam_module _pam_mail_modstruct = { + "pam_mail", + pam_sm_authenticate, + pam_sm_setcred, + NULL, + pam_sm_open_session, + pam_sm_close_session, + NULL, +}; + +#endif + +/* end of module definition */ diff --git a/modules/pam_mail/tst-pam_mail b/modules/pam_mail/tst-pam_mail new file mode 100755 index 00000000..99fb7ed0 --- /dev/null +++ b/modules/pam_mail/tst-pam_mail @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_mail.so diff --git a/modules/pam_mkhomedir/Makefile.am b/modules/pam_mkhomedir/Makefile.am new file mode 100644 index 00000000..7ed3a9f0 --- /dev/null +++ b/modules/pam_mkhomedir/Makefile.am @@ -0,0 +1,33 @@ +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README $(MANS) $(XMLS) tst-pam_mkhomedir + +man_MANS = pam_mkhomedir.8 + +XMLS = README.xml pam_mkhomedir.8.xml + +TESTS = tst-pam_mkhomedir + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_mkhomedir.la +pam_mkhomedir_la_SOURCES = pam_mkhomedir.c +pam_mkhomedir_la_LIBADD = -L$(top_builddir)/libpam -lpam + +if ENABLE_REGENERATE_MAN +noinst_DATA = README +README: pam_mkhomedir.8.xml +-include $(top_srcdir)/Make.xml.rules +endif + diff --git a/modules/pam_mkhomedir/Makefile.in b/modules/pam_mkhomedir/Makefile.in new file mode 100644 index 00000000..24cb3b73 --- /dev/null +++ b/modules/pam_mkhomedir/Makefile.in @@ -0,0 +1,668 @@ +# Makefile.in generated by automake 1.10.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 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mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \ + tags uninstall uninstall-am uninstall-man uninstall-man8 \ + uninstall-securelibLTLIBRARIES + +@ENABLE_REGENERATE_MAN_TRUE@README: pam_mkhomedir.8.xml +@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_mkhomedir/README b/modules/pam_mkhomedir/README new file mode 100644 index 00000000..64810060 --- /dev/null +++ b/modules/pam_mkhomedir/README @@ -0,0 +1,36 @@ +pam_mkhomedir — PAM module to create users home directory + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +The pam_mkhomedir PAM module will create a users home directory if it does not +exist when the session begins. This allows users to be present in central +database (such as NIS, kerberos or LDAP) without using a distributed file +system or pre-creating a large number of directories. The skeleton directory +(usually /etc/skel/) is used to copy default files and also set's a umask for +the creation. + +The new users home directory will not be removed after logout of the user. + +EXAMPLES + +A sample /etc/pam.d/login file: + + auth requisite pam_securetty.so + auth sufficient pam_ldap.so + auth required pam_unix.so + auth required pam_nologin.so + account sufficient pam_ldap.so + account required pam_unix.so + password required pam_unix.so + session required pam_mkhomedir.so skel=/etc/skel/ umask=0022 + session required pam_unix.so + session optional pam_lastlog.so + session optional pam_mail.so standard + + +AUTHOR + +pam_mkhomedir was written by Jason Gunthorpe <jgg@debian.org>. + diff --git a/modules/pam_mkhomedir/README.xml b/modules/pam_mkhomedir/README.xml new file mode 100644 index 00000000..978cbe77 --- /dev/null +++ b/modules/pam_mkhomedir/README.xml @@ -0,0 +1,36 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_mkhomedir.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_mkhomedir.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_mkhomedir-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_mkhomedir.8.xml" xpointer='xpointer(//refsect1[@id = "pam_mkhomedir-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_mkhomedir.8.xml" xpointer='xpointer(//refsect1[@id = "pam_mkhomedir-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_mkhomedir.8.xml" xpointer='xpointer(//refsect1[@id = "pam_mkhomedir-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_mkhomedir/pam_mkhomedir.8 b/modules/pam_mkhomedir/pam_mkhomedir.8 new file mode 100644 index 00000000..cab1fda1 --- /dev/null +++ b/modules/pam_mkhomedir/pam_mkhomedir.8 @@ -0,0 +1,109 @@ +.\" Title: pam_mkhomedir +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_MKHOMEDIR" "8" "04/16/2008" "Linux-PAM Manual" "Linux-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_mkhomedir - PAM module to create users home directory +.SH "SYNOPSIS" +.HP 17 +\fBpam_mkhomedir\.so\fR [silent] [umask=\fImode\fR] [skel=\fIskeldir\fR] +.SH "DESCRIPTION" +.PP +The pam_mkhomedir PAM module will create a users home directory if it does not exist when the session begins\. This allows users to be present in central database (such as NIS, kerberos or LDAP) without using a distributed file system or pre\-creating a large number of directories\. The skeleton directory (usually +\fI/etc/skel/\fR) is used to copy default files and also set\'s a umask for the creation\. +.PP +The new users home directory will not be removed after logout of the user\. +.SH "OPTIONS" +.PP +\fBsilent\fR +.RS 4 +Don\'t print informative messages\. +.RE +.PP +\fBumask=\fR\fB\fImask\fR\fR +.RS 4 +The user file\-creation mask is set to +\fImask\fR\. The default value of mask is 0022\. +.RE +.PP +\fBskel=\fR\fB\fI/path/to/skel/directory\fR\fR +.RS 4 +Indicate an alternative +\fIskel\fR +directory to override the default +\fI/etc/skel\fR\. +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +Only the +\fBsession\fR +service is supported\. +.SH "RETURN VALUES" +.PP +PAM_BUF_ERR +.RS 4 +Memory buffer error\. +.RE +.PP +PAM_CRED_INSUFFICIENT +.RS 4 +Insufficient credentials to access authentication data\. +.RE +.PP +PAM_PERM_DENIED +.RS 4 +Not enough permissions to create the new directory or read the skel directory\. +.RE +.PP +PAM_USER_UNKNOWN +.RS 4 +User not known to the underlying authentication module\. +.RE +.PP +PAM_SUCCESS +.RS 4 +Environment variables were set\. +.RE +.SH "FILES" +.PP +\fI/etc/skel\fR +.RS 4 +Default skel directory +.RE +.SH "EXAMPLES" +.PP +A sample /etc/pam\.d/login file: +.sp +.RS 4 +.nf + auth requisite pam_securetty\.so + auth sufficient pam_ldap\.so + auth required pam_unix\.so + auth required pam_nologin\.so + account sufficient pam_ldap\.so + account required pam_unix\.so + password required pam_unix\.so + session required pam_mkhomedir\.so skel=/etc/skel/ umask=0022 + session required pam_unix\.so + session optional pam_lastlog\.so + session optional pam_mail\.so standard + +.fi +.RE +.sp +.SH "SEE ALSO" +.PP + +\fBpam.d\fR(8), +\fBpam\fR(8)\. +.SH "AUTHOR" +.PP +pam_mkhomedir was written by Jason Gunthorpe <jgg@debian\.org>\. diff --git a/modules/pam_mkhomedir/pam_mkhomedir.8.xml b/modules/pam_mkhomedir/pam_mkhomedir.8.xml new file mode 100644 index 00000000..3c40de15 --- /dev/null +++ b/modules/pam_mkhomedir/pam_mkhomedir.8.xml @@ -0,0 +1,203 @@ +<?xml version="1.0" encoding="ISO-8859-1"?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN" + "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd"> + +<refentry id='pam_mkhomedir'> + + <refmeta> + <refentrytitle>pam_mkhomedir</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class='setdesc'>Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id='pam_mkhomedir-name'> + <refname>pam_mkhomedir</refname> + <refpurpose> + PAM module to create users home directory + </refpurpose> + </refnamediv> + +<!-- body begins here --> + + <refsynopsisdiv> + <cmdsynopsis id="pam_mkhomedir-cmdsynopsis"> + <command>pam_mkhomedir.so</command> + <arg choice="opt"> + silent + </arg> + <arg choice="opt"> + umask=<replaceable>mode</replaceable> + </arg> + <arg choice="opt"> + skel=<replaceable>skeldir</replaceable> + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + + <refsect1 id="pam_mkhomedir-description"> + <title>DESCRIPTION</title> + <para> + The pam_mkhomedir PAM module will create a users home directory + if it does not exist when the session begins. This allows users + to be present in central database (such as NIS, kerberos or LDAP) + without using a distributed file system or pre-creating a large + number of directories. The skeleton directory (usually + <filename>/etc/skel/</filename>) is used to copy default files + and also set's a umask for the creation. + </para> + <para> + The new users home directory will not be removed after logout + of the user. + </para> + </refsect1> + + <refsect1 id="pam_mkhomedir-options"> + <title>OPTIONS</title> + <variablelist> + + <varlistentry> + <term> + <option>silent</option> + </term> + <listitem> + <para> + Don't print informative messages. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>umask=<replaceable>mask</replaceable></option> + </term> + <listitem> + <para> + The user file-creation mask is set to + <replaceable>mask</replaceable>. The default value of mask is + 0022. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>skel=<replaceable>/path/to/skel/directory</replaceable></option> + </term> + <listitem> + <para> + Indicate an alternative <filename>skel</filename> directory + to override the default <filename>/etc/skel</filename>. + </para> + </listitem> + </varlistentry> + + </variablelist> + </refsect1> + + <refsect1 id="pam_mkhomedir-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + Only the <option>session</option> service is supported. + </para> + </refsect1> + + <refsect1 id="pam_mkhomedir-return_values"> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_BUF_ERR</term> + <listitem> + <para> + Memory buffer error. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_CRED_INSUFFICIENT</term> + <listitem> + <para> + Insufficient credentials to access authentication data. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_PERM_DENIED</term> + <listitem> + <para> + Not enough permissions to create the new directory + or read the skel directory. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_USER_UNKNOWN</term> + <listitem> + <para> + User not known to the underlying authentication module. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + Environment variables were set. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_mkhomedir-files"> + <title>FILES</title> + <variablelist> + <varlistentry> + <term><filename>/etc/skel</filename></term> + <listitem> + <para>Default skel directory</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id='pam_mkhomedir-examples'> + <title>EXAMPLES</title> + <para> + A sample /etc/pam.d/login file: + <programlisting> + auth requisite pam_securetty.so + auth sufficient pam_ldap.so + auth required pam_unix.so + auth required pam_nologin.so + account sufficient pam_ldap.so + account required pam_unix.so + password required pam_unix.so + session required pam_mkhomedir.so skel=/etc/skel/ umask=0022 + session required pam_unix.so + session optional pam_lastlog.so + session optional pam_mail.so standard + </programlisting> + </para> + </refsect1> + + + <refsect1 id="pam_mkhomedir-see_also"> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>. + </para> + </refsect1> + + <refsect1 id="pam_mkhomedir-author"> + <title>AUTHOR</title> + <para> + pam_mkhomedir was written by Jason Gunthorpe <jgg@debian.org>. + </para> + </refsect1> +</refentry> diff --git a/modules/pam_mkhomedir/pam_mkhomedir.c b/modules/pam_mkhomedir/pam_mkhomedir.c new file mode 100644 index 00000000..44b092c1 --- /dev/null +++ b/modules/pam_mkhomedir/pam_mkhomedir.c @@ -0,0 +1,511 @@ +/* PAM Make Home Dir module + + This module will create a users home directory if it does not exist + when the session begins. This allows users to be present in central + database (such as nis, kerb or ldap) without using a distributed + file system or pre-creating a large number of directories. + + Here is a sample /etc/pam.d/login file for Debian GNU/Linux + 2.1: + + auth requisite pam_securetty.so + auth sufficient pam_ldap.so + auth required pam_unix.so + auth optional pam_group.so + auth optional pam_mail.so + account requisite pam_time.so + account sufficient pam_ldap.so + account required pam_unix.so + session required pam_mkhomedir.so skel=/etc/skel/ umask=0022 + session required pam_unix.so + session optional pam_lastlog.so + password required pam_unix.so + + Released under the GNU LGPL version 2 or later + Originally written by Jason Gunthorpe <jgg@debian.org> Feb 1999 + Structure taken from pam_lastlogin by Andrew Morgan + <morgan@parc.power.net> 1996 + */ + +#include "config.h" + +#include <stdarg.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <unistd.h> +#include <pwd.h> +#include <errno.h> +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <dirent.h> +#include <syslog.h> + +/* + * here, we make a definition for the externally accessible function + * in this file (this definition is required for static a module + * but strongly encouraged generally) it is used to instruct the + * modules include file to define the function prototypes. + */ + +#define PAM_SM_SESSION + +#include <security/pam_modules.h> +#include <security/_pam_macros.h> +#include <security/pam_modutil.h> +#include <security/pam_ext.h> + + +/* argument parsing */ +#define MKHOMEDIR_DEBUG 020 /* be verbose about things */ +#define MKHOMEDIR_QUIET 040 /* keep quiet about things */ + +static unsigned int UMask = 0022; +static char SkelDir[BUFSIZ] = "/etc/skel"; /* THIS MODULE IS NOT THREAD SAFE */ + +static int +_pam_parse (const pam_handle_t *pamh, int flags, int argc, const char **argv) +{ + int ctrl = 0; + + /* does the appliction require quiet? */ + if ((flags & PAM_SILENT) == PAM_SILENT) + ctrl |= MKHOMEDIR_QUIET; + + /* step through arguments */ + for (; argc-- > 0; ++argv) + { + if (!strcmp(*argv, "silent")) { + ctrl |= MKHOMEDIR_QUIET; + } else if (!strcmp(*argv, "debug")) { + ctrl |= MKHOMEDIR_DEBUG; + } else if (!strncmp(*argv,"umask=",6)) { + UMask = strtol(*argv+6,0,0); + } else if (!strncmp(*argv,"skel=",5)) { + strncpy(SkelDir,*argv+5,sizeof(SkelDir)); + SkelDir[sizeof(SkelDir)-1] = '\0'; + } else { + pam_syslog(pamh, LOG_ERR, "unknown option: %s", *argv); + } + } + + D(("ctrl = %o", ctrl)); + return ctrl; +} + +static int +rec_mkdir (const char *dir, mode_t mode) +{ + char *cp; + char *parent = strdup (dir); + + if (parent == NULL) + return 1; + + cp = strrchr (parent, '/'); + + if (cp != NULL && cp != parent) + { + struct stat st; + + *cp++ = '\0'; + if (stat (parent, &st) == -1 && errno == ENOENT) + if (rec_mkdir (parent, mode) != 0) + { + free (parent); + return 1; + } + } + + free (parent); + + if (mkdir (dir, mode) != 0 && errno != EEXIST) + return 1; + + return 0; +} + +/* Do the actual work of creating a home dir */ +static int +create_homedir (pam_handle_t * pamh, int ctrl, + const struct passwd *pwd, + const char *source, const char *dest) +{ + char remark[BUFSIZ]; + DIR *D; + struct dirent *Dir; + int retval = PAM_AUTH_ERR; + + /* Mention what is happening, if the notification fails that is OK */ + if ((ctrl & MKHOMEDIR_QUIET) != MKHOMEDIR_QUIET) + pam_info(pamh, _("Creating directory '%s'."), dest); + + /* Create the new directory */ + if (rec_mkdir (dest,0755) != 0) + { + pam_error(pamh, _("Unable to create directory %s: %m"), dest); + pam_syslog(pamh, LOG_ERR, "unable to create directory %s: %m", dest); + return PAM_PERM_DENIED; + } + + /* See if we need to copy the skel dir over. */ + if ((source == NULL) || (strlen(source) == 0)) + { + retval = PAM_SUCCESS; + goto go_out; + } + + /* Scan the directory */ + D = opendir (source); + if (D == 0) + { + pam_syslog(pamh, LOG_DEBUG, "unable to read directory %s: %m", source); + retval = PAM_PERM_DENIED; + goto go_out; + } + + for (Dir = readdir(D); Dir != 0; Dir = readdir(D)) + { + int SrcFd; + int DestFd; + int Res; + struct stat St; +#ifndef PATH_MAX + char *newsource = NULL, *newdest = NULL; + /* track length of buffers */ + int nslen = 0, ndlen = 0; + int slen = strlen(source), dlen = strlen(dest); +#else + char newsource[PATH_MAX], newdest[PATH_MAX]; +#endif + + /* Skip some files.. */ + if (strcmp(Dir->d_name,".") == 0 || + strcmp(Dir->d_name,"..") == 0) + continue; + + /* Determine what kind of file it is. */ +#ifndef PATH_MAX + nslen = slen + strlen(Dir->d_name) + 2; + + if (nslen <= 0) + { + retval = PAM_BUF_ERR; + goto go_out; + } + + if ((newsource = malloc (nslen)) == NULL) + { + retval = PAM_BUF_ERR; + goto go_out; + } + + sprintf(newsource, "%s/%s", source, Dir->d_name); +#else + snprintf(newsource,sizeof(newsource),"%s/%s",source,Dir->d_name); +#endif + + if (lstat(newsource,&St) != 0) +#ifndef PATH_MAX + { + free(newsource); + newsource = NULL; + continue; + } +#else + continue; +#endif + + + /* We'll need the new file's name. */ +#ifndef PATH_MAX + ndlen = dlen + strlen(Dir->d_name)+2; + + if (ndlen <= 0) + { + retval = PAM_BUF_ERR; + goto go_out; + } + + if ((newdest = malloc(ndlen)) == NULL) + { + free (newsource); + retval = PAM_BUF_ERR; + goto go_out; + } + + sprintf (newdest, "%s/%s", dest, Dir->d_name); +#else + snprintf (newdest,sizeof (newdest),"%s/%s",dest,Dir->d_name); +#endif + + /* If it's a directory, recurse. */ + if (S_ISDIR(St.st_mode)) + { + retval = create_homedir (pamh, ctrl, pwd, newsource, newdest); + +#ifndef PATH_MAX + free(newsource); newsource = NULL; + free(newdest); newdest = NULL; +#endif + + if (retval != PAM_SUCCESS) + { + closedir(D); + goto go_out; + } + continue; + } + + /* If it's a symlink, create a new link. */ + if (S_ISLNK(St.st_mode)) + { + int pointedlen = 0; +#ifndef PATH_MAX + char *pointed = NULL; + { + int size = 100; + + while (1) { + pointed = (char *) malloc(size); + if ( ! pointed ) { + free(newsource); + free(newdest); + return PAM_BUF_ERR; + } + pointedlen = readlink (newsource, pointed, size); + if ( pointedlen < 0 ) break; + if ( pointedlen < size ) break; + free (pointed); + size *= 2; + } + } + if ( pointedlen < 0 ) + free(pointed); + else + pointed[pointedlen] = 0; +#else + char pointed[PATH_MAX]; + memset(pointed, 0, sizeof(pointed)); + + pointedlen = readlink(newsource, pointed, sizeof(pointed) - 1); +#endif + + if ( pointedlen >= 0 ) { + if(symlink(pointed, newdest) == 0) + { + if (lchown(newdest,pwd->pw_uid,pwd->pw_gid) != 0) + { + pam_syslog(pamh, LOG_DEBUG, + "unable to change perms on link %s: %m", newdest); + closedir(D); +#ifndef PATH_MAX + free(pointed); + free(newsource); + free(newdest); +#endif + return PAM_PERM_DENIED; + } + } +#ifndef PATH_MAX + free(pointed); +#endif + } +#ifndef PATH_MAX + free(newsource); newsource = NULL; + free(newdest); newdest = NULL; +#endif + continue; + } + + /* If it's not a regular file, it's probably not a good idea to create + * the new device node, FIFO, or whatever it is. */ + if (!S_ISREG(St.st_mode)) + { +#ifndef PATH_MAX + free(newsource); newsource = NULL; + free(newdest); newdest = NULL; +#endif + continue; + } + + /* Open the source file */ + if ((SrcFd = open(newsource,O_RDONLY)) < 0 || fstat(SrcFd,&St) != 0) + { + pam_syslog(pamh, LOG_DEBUG, + "unable to open src file %s: %m", newsource); + closedir(D); + +#ifndef PATH_MAX + free(newsource); newsource = NULL; + free(newdest); newdest = NULL; +#endif + + return PAM_PERM_DENIED; + } + if (stat(newsource,&St) != 0) + { + pam_syslog(pamh, LOG_DEBUG, "unable to stat src file %s: %m", + newsource); + close(SrcFd); + closedir(D); + +#ifndef PATH_MAX + free(newsource); newsource = NULL; + free(newdest); newdest = NULL; +#endif + + return PAM_PERM_DENIED; + } + + /* Open the dest file */ + if ((DestFd = open(newdest,O_WRONLY | O_TRUNC | O_CREAT,0600)) < 0) + { + pam_syslog(pamh, LOG_DEBUG, + "unable to open dest file %s: %m", newdest); + close(SrcFd); + closedir(D); + +#ifndef PATH_MAX + free(newsource); newsource = NULL; + free(newdest); newdest = NULL; +#endif + return PAM_PERM_DENIED; + } + + /* Set the proper ownership and permissions for the module. We make + the file a+w and then mask it with the set mask. This preseves + execute bits */ + if (fchmod(DestFd,(St.st_mode | 0222) & (~UMask)) != 0 || + fchown(DestFd,pwd->pw_uid,pwd->pw_gid) != 0) + { + pam_syslog(pamh, LOG_DEBUG, + "unable to change perms on copy %s: %m", newdest); + close(SrcFd); + close(DestFd); + closedir(D); + +#ifndef PATH_MAX + free(newsource); newsource = NULL; + free(newdest); newdest = NULL; +#endif + + return PAM_PERM_DENIED; + } + + /* Copy the file */ + do + { + Res = pam_modutil_read(SrcFd,remark,sizeof(remark)); + + if (Res == 0) + continue; + + if (Res > 0) { + if (pam_modutil_write(DestFd,remark,Res) == Res) + continue; + } + + /* If we get here, pam_modutil_read returned a -1 or + pam_modutil_write returned something unexpected. */ + pam_syslog(pamh, LOG_DEBUG, "unable to perform IO: %m"); + close(SrcFd); + close(DestFd); + closedir(D); + +#ifndef PATH_MAX + free(newsource); newsource = NULL; + free(newdest); newdest = NULL; +#endif + + return PAM_PERM_DENIED; + } + while (Res != 0); + close(SrcFd); + close(DestFd); + +#ifndef PATH_MAX + free(newsource); newsource = NULL; + free(newdest); newdest = NULL; +#endif + + } + closedir(D); + + retval = PAM_SUCCESS; + + go_out: + + if (chmod(dest,0777 & (~UMask)) != 0 || + chown(dest,pwd->pw_uid,pwd->pw_gid) != 0) + { + pam_syslog(pamh, LOG_DEBUG, + "unable to change perms on directory %s: %m", dest); + return PAM_PERM_DENIED; + } + + return retval; +} + +/* --- authentication management functions (only) --- */ + +PAM_EXTERN int +pam_sm_open_session (pam_handle_t *pamh, int flags, int argc, + const char **argv) +{ + int retval, ctrl; + const void *user; + const struct passwd *pwd; + struct stat St; + + /* Parse the flag values */ + ctrl = _pam_parse(pamh, flags, argc, argv); + + /* Determine the user name so we can get the home directory */ + retval = pam_get_item(pamh, PAM_USER, &user); + if (retval != PAM_SUCCESS || user == NULL || *(const char *)user == '\0') + { + pam_syslog(pamh, LOG_NOTICE, "user unknown"); + return PAM_USER_UNKNOWN; + } + + /* Get the password entry */ + pwd = pam_modutil_getpwnam (pamh, user); + if (pwd == NULL) + { + D(("couldn't identify user %s", user)); + return PAM_CRED_INSUFFICIENT; + } + + /* Stat the home directory, if something exists then we assume it is + correct and return a success*/ + if (stat(pwd->pw_dir,&St) == 0) + return PAM_SUCCESS; + + return create_homedir(pamh,ctrl,pwd,SkelDir,pwd->pw_dir); +} + +/* Ignore */ +PAM_EXTERN +int pam_sm_close_session (pam_handle_t * pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_SUCCESS; +} + +#ifdef PAM_STATIC + +/* static module data */ +struct pam_module _pam_mkhomedir_modstruct = +{ + "pam_mkhomedir", + NULL, + NULL, + NULL, + pam_sm_open_session, + pam_sm_close_session, + NULL, +}; + +#endif diff --git a/modules/pam_mkhomedir/tst-pam_mkhomedir b/modules/pam_mkhomedir/tst-pam_mkhomedir new file mode 100755 index 00000000..5447883f --- /dev/null +++ b/modules/pam_mkhomedir/tst-pam_mkhomedir @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_mkhomedir.so diff --git a/modules/pam_motd/Makefile.am b/modules/pam_motd/Makefile.am new file mode 100644 index 00000000..872e5d37 --- /dev/null +++ b/modules/pam_motd/Makefile.am @@ -0,0 +1,31 @@ +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README $(MANS) $(XMLS) tst-pam_motd + +man_MANS = pam_motd.8 +XMLS = README.xml pam_motd.8.xml + +TESTS = tst-pam_motd + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_motd.la +pam_motd_la_LIBADD = -L$(top_builddir)/libpam -lpam + +if ENABLE_REGENERATE_MAN +noinst_DATA = README +README: pam_motd.8.xml +-include $(top_srcdir)/Make.xml.rules +endif + diff --git a/modules/pam_motd/Makefile.in b/modules/pam_motd/Makefile.in new file mode 100644 index 00000000..1b2ec6e8 --- /dev/null +++ b/modules/pam_motd/Makefile.in @@ -0,0 +1,667 @@ +# Makefile.in generated by automake 1.10.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY, to the extent permitted by law; without +# even the implied warranty of MERCHANTABILITY or FITNESS FOR A +# PARTICULAR PURPOSE. + +@SET_MAKE@ + +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + + +VPATH = @srcdir@ +pkgdatadir = $(datadir)/@PACKAGE@ +pkglibdir = $(libdir)/@PACKAGE@ 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install-strip installcheck \ + installcheck-am installdirs maintainer-clean \ + maintainer-clean-generic mostlyclean mostlyclean-compile \ + mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \ + tags uninstall uninstall-am uninstall-man uninstall-man8 \ + uninstall-securelibLTLIBRARIES + +@ENABLE_REGENERATE_MAN_TRUE@README: pam_motd.8.xml +@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_motd/README b/modules/pam_motd/README new file mode 100644 index 00000000..414ad6f6 --- /dev/null +++ b/modules/pam_motd/README @@ -0,0 +1,27 @@ +pam_motd — Display the motd file + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +pam_motd is a PAM module that can be used to display arbitrary motd (message of +the day) files after a succesful login. By default the /etc/motd file is shown. +The message size is limited to 64KB. + +OPTIONS + +motd=/path/filename + + The /path/filename file is displayed as message of the day. + +EXAMPLES + +The suggested usage for /etc/pam.d/login is: + +session optional pam_motd.so motd=/etc/motd + + +AUTHOR + +pam_motd was written by Ben Collins <bcollins@debian.org>. + diff --git a/modules/pam_motd/README.xml b/modules/pam_motd/README.xml new file mode 100644 index 00000000..779e4d17 --- /dev/null +++ b/modules/pam_motd/README.xml @@ -0,0 +1,41 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_motd.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_motd.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_motd-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_motd.8.xml" xpointer='xpointer(//refsect1[@id = "pam_motd-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_motd.8.xml" xpointer='xpointer(//refsect1[@id = "pam_motd-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_motd.8.xml" xpointer='xpointer(//refsect1[@id = "pam_motd-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_motd.8.xml" xpointer='xpointer(//refsect1[@id = "pam_motd-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_motd/pam_motd.8 b/modules/pam_motd/pam_motd.8 new file mode 100644 index 00000000..d2763c5a --- /dev/null +++ b/modules/pam_motd/pam_motd.8 @@ -0,0 +1,64 @@ +.\" Title: pam_motd +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_MOTD" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_motd - Display the motd file +.SH "SYNOPSIS" +.HP 12 +\fBpam_motd\.so\fR [motd=\fI/path/filename\fR] +.SH "DESCRIPTION" +.PP +pam_motd is a PAM module that can be used to display arbitrary motd (message of the day) files after a succesful login\. By default the +\fI/etc/motd\fR +file is shown\. The message size is limited to 64KB\. +.SH "OPTIONS" +.PP +\fBmotd=\fR\fB\fI/path/filename\fR\fR +.RS 4 +The +\fI/path/filename\fR +file is displayed as message of the day\. +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +Only the +\fBsession\fR +service is supported\. +.SH "RETURN VALUES" +.PP +PAM_IGNORE +.RS 4 +This is the only return value of this module\. +.RE +.SH "EXAMPLES" +.PP +The suggested usage for +\fI/etc/pam\.d/login\fR +is: +.sp +.RS 4 +.nf +session optional pam_motd\.so motd=/etc/motd + +.fi +.RE +.sp +.SH "SEE ALSO" +.PP + +\fBmotd\fR(5), +\fBpam.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_motd was written by Ben Collins <bcollins@debian\.org>\. diff --git a/modules/pam_motd/pam_motd.8.xml b/modules/pam_motd/pam_motd.8.xml new file mode 100644 index 00000000..7bd6798c --- /dev/null +++ b/modules/pam_motd/pam_motd.8.xml @@ -0,0 +1,114 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_motd"> + + <refmeta> + <refentrytitle>pam_motd</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_motd-name"> + <refname>pam_motd</refname> + <refpurpose>Display the motd file</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_motd-cmdsynopsis"> + <command>pam_motd.so</command> + <arg choice="opt"> + motd=<replaceable>/path/filename</replaceable> + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_motd-description"> + + <title>DESCRIPTION</title> + + <para> + pam_motd is a PAM module that can be used to display + arbitrary motd (message of the day) files after a succesful + login. By default the <filename>/etc/motd</filename> file is + shown. The message size is limited to 64KB. + </para> + + </refsect1> + + <refsect1 id="pam_motd-options"> + + <title>OPTIONS</title> + <variablelist> + <varlistentry> + <term> + <option>motd=<replaceable>/path/filename</replaceable></option> + </term> + <listitem> + <para> + The <filename>/path/filename</filename> file is displayed + as message of the day. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_motd-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + Only the <option>session</option> service is supported. + </para> + </refsect1> + + <refsect1 id='pam_motd-return_values'> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_IGNORE</term> + <listitem> + <para> + This is the only return value of this module. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id='pam_motd-examples'> + <title>EXAMPLES</title> + <para> + The suggested usage for <filename>/etc/pam.d/login</filename> is: + <programlisting> +session optional pam_motd.so motd=/etc/motd + </programlisting> + </para> + </refsect1> + + <refsect1 id='pam_motd-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>motd</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_motd-author'> + <title>AUTHOR</title> + <para> + pam_motd was written by Ben Collins <bcollins@debian.org>. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_motd/pam_motd.c b/modules/pam_motd/pam_motd.c new file mode 100644 index 00000000..abf10a2f --- /dev/null +++ b/modules/pam_motd/pam_motd.c @@ -0,0 +1,130 @@ +/* pam_motd module */ + +/* + * Modified for pam_motd by Ben Collins <bcollins@debian.org> + * + * Based off of: + * $Id: pam_motd.c,v 1.12 2005/10/04 11:35:18 ldv Exp $ + * + * Written by Michael K. Johnson <johnsonm@redhat.com> 1996/10/24 + * + */ + +#include "config.h" + +#include <stdio.h> +#include <string.h> +#include <stdlib.h> +#include <unistd.h> +#include <fcntl.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <pwd.h> +#include <syslog.h> + +#include <security/_pam_macros.h> +#include <security/pam_ext.h> +/* + * here, we make a definition for the externally accessible function + * in this file (this definition is required for static a module + * but strongly encouraged generally) it is used to instruct the + * modules include file to define the function prototypes. + */ + +#define PAM_SM_SESSION +#define DEFAULT_MOTD "/etc/motd" + +#include <security/pam_modules.h> +#include <security/pam_modutil.h> + +/* --- session management functions (only) --- */ + +PAM_EXTERN int +pam_sm_close_session (pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_IGNORE; +} + +static char default_motd[] = DEFAULT_MOTD; + +PAM_EXTERN +int pam_sm_open_session(pam_handle_t *pamh, int flags, + int argc, const char **argv) +{ + int retval = PAM_IGNORE; + int fd; + const char *motd_path = NULL; + char *mtmp = NULL; + + if (flags & PAM_SILENT) { + return retval; + } + + for (; argc-- > 0; ++argv) { + if (!strncmp(*argv,"motd=",5)) { + + motd_path = 5 + *argv; + if (*motd_path != '\0') { + D(("set motd path: %s", motd_path)); + } else { + motd_path = NULL; + pam_syslog(pamh, LOG_ERR, + "motd= specification missing argument - ignored"); + } + } + else + pam_syslog(pamh, LOG_ERR, "unknown option: %s", *argv); + } + + if (motd_path == NULL) + motd_path = default_motd; + + while ((fd = open(motd_path, O_RDONLY, 0)) >= 0) { + struct stat st; + + /* fill in message buffer with contents of motd */ + if ((fstat(fd, &st) < 0) || !st.st_size || st.st_size > 0x10000) + break; + + if (!(mtmp = malloc(st.st_size+1))) + break; + + if (pam_modutil_read(fd, mtmp, st.st_size) != st.st_size) + break; + + if (mtmp[st.st_size-1] == '\n') + mtmp[st.st_size-1] = '\0'; + else + mtmp[st.st_size] = '\0'; + + pam_info (pamh, "%s", mtmp); + break; + } + + _pam_drop (mtmp); + + if (fd >= 0) + close(fd); + + return retval; +} + + +#ifdef PAM_STATIC + +/* static module data */ + +struct pam_module _pam_motd_modstruct = { + "pam_motd", + NULL, + NULL, + NULL, + pam_sm_open_session, + pam_sm_close_session, + NULL, +}; + +#endif + +/* end of module definition */ diff --git a/modules/pam_motd/tst-pam_motd b/modules/pam_motd/tst-pam_motd new file mode 100755 index 00000000..155e2304 --- /dev/null +++ b/modules/pam_motd/tst-pam_motd @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_motd.so diff --git a/modules/pam_namespace/Makefile.am b/modules/pam_namespace/Makefile.am new file mode 100644 index 00000000..05d47cf3 --- /dev/null +++ b/modules/pam_namespace/Makefile.am @@ -0,0 +1,42 @@ +# +# Copyright (c) 2006 Red Hat, Inc. +# + +CLEANFILES = *~ +MAN5 = namespace.conf.5 +MAN8 = pam_namespace.8 + +XMLS = README.xml namespace.conf.5.xml pam_namespace.8.xml + +if ENABLE_REGENERATE_MAN +noinst_DATA = README +-include $(top_srcdir)/Make.xml.rules +endif + +EXTRA_DIST = README namespace.conf namespace.init $(MAN5) $(MAN8) $(XMLS) tst-pam_namespace + +noinst_HEADERS = md5.h pam_namespace.h argv_parse.h + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) +namespaceddir = $(SCONFIGDIR)/namespace.d + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include \ + -DSECURECONF_DIR=\"$(SCONFIGDIR)/\" +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +if HAVE_UNSHARE +securelib_LTLIBRARIES = pam_namespace.la +pam_namespace_la_SOURCES = pam_namespace.c md5.c argv_parse.c +pam_namespace_la_LIBADD = -L$(top_builddir)/libpam -lpam @LIBSELINUX@ + +secureconf_DATA = namespace.conf +secureconf_SCRIPTS = namespace.init +namespaced_DATA = + +TESTS = tst-pam_namespace +man_MANS = $(MAN5) $(MAN8) +endif 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dvi dvi-am html \ + html-am info info-am install install-am install-data \ + install-data-am install-dvi install-dvi-am install-exec \ + install-exec-am install-html install-html-am install-info \ + install-info-am install-man install-man5 install-man8 \ + install-namespacedDATA install-pdf install-pdf-am install-ps \ + install-ps-am install-secureconfDATA install-secureconfSCRIPTS \ + install-securelibLTLIBRARIES install-strip installcheck \ + installcheck-am installdirs maintainer-clean \ + maintainer-clean-generic mostlyclean mostlyclean-compile \ + mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \ + tags uninstall uninstall-am uninstall-man uninstall-man5 \ + uninstall-man8 uninstall-namespacedDATA \ + uninstall-secureconfDATA uninstall-secureconfSCRIPTS \ + uninstall-securelibLTLIBRARIES + +@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_namespace/README b/modules/pam_namespace/README new file mode 100644 index 00000000..13c9c45b --- /dev/null +++ b/modules/pam_namespace/README @@ -0,0 +1,203 @@ +pam_namespace — PAM module for configuring namespace for a session + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +The pam_namespace PAM module sets up a private namespace for a session with +polyinstantiated directories. A polyinstantiated directory provides a different +instance of itself based on user name, or when using SELinux, user name, +security context or both. If an executable script /etc/security/namespace.init +exists, it is used to initialize the namespace every time a new instance +directory is setup. The script receives the polyinstantiated directory path, +the instance directory path, flag whether the instance directory was newly +created (0 for no, 1 for yes), and the user name as its arguments. + +The pam_namespace module disassociates the session namespace from the parent +namespace. Any mounts/unmounts performed in the parent namespace, such as +mounting of devices, are not reflected in the session namespace. To propagate +selected mount/unmount events from the parent namespace into the disassociated +session namespace, an administrator may use the special shared-subtree feature. +For additional information on shared-subtree feature, please refer to the mount +(8) man page and the shared-subtree description at http://lwn.net/Articles/ +159077 and http://lwn.net/Articles/159092. + +OPTIONS + +debug + + A lot of debug information is logged using syslog + +unmnt_remnt + + For programs such as su and newrole, the login session has already setup a + polyinstantiated namespace. For these programs, polyinstantiation is + performed based on new user id or security context, however the command + first needs to undo the polyinstantiation performed by login. This argument + instructs the command to first undo previous polyinstantiation before + proceeding with new polyinstantiation based on new id/context + +unmnt_only + + For trusted programs that want to undo any existing bind mounts and process + instance directories on their own, this argument allows them to unmount + currently mounted instance directories + +require_selinux + + If selinux is not enabled, return failure + +gen_hash + + Instead of using the security context string for the instance name, + generate and use its md5 hash. + +ignore_config_error + + If a line in the configuration file corresponding to a polyinstantiated + directory contains format error, skip that line process the next line. + Without this option, pam will return an error to the calling program + resulting in termination of the session. + +ignore_instance_parent_mode + + Instance parent directories by default are expected to have the restrictive + mode of 000. Using this option, an administrator can choose to ignore the + mode of the instance parent. This option should be used with caution as it + will reduce security and isolation goals of the polyinstantiation + mechanism. + +no_unmount_on_close + + For certain trusted programs such as newrole, open session is called from a + child process while the parent perfoms close session and pam end functions. + For these commands use this option to instruct pam_close_session to not + unmount the bind mounted polyinstantiated directory in the parent. + +use_current_context + + Useful for services which do not change the SELinux context with setexeccon + call. The module will use the current SELinux context of the calling + process for the level and context polyinstantiation. + +use_default_context + + Useful for services which do not use pam_selinux for changing the SELinux + context with setexeccon call. The module will use the default SELinux + context of the user for the level and context polyinstantiation. + +DESCRIPTION + +The pam_namespace.so module allows setup of private namespaces with +polyinstantiated directories. Directories can be polyinstantiated based on user +name or, in the case of SELinux, user name, sensitivity level or complete +security context. If an executable script /etc/security/namespace.init exists, +it is used to initialize the namespace every time a new instance directory is +setup. The script receives the polyinstantiated directory path and the instance +directory path as its arguments. + +The /etc/security/namespace.conf file specifies which directories are +polyinstantiated, how they are polyinstantiated, how instance directories would +be named, and any users for whom polyinstantiation would not be performed. + +When someone logs in, the file namespace.conf is scanned. Comments are marked +by # characters. Each non comment line represents one polyinstantiated +directory. The fields are separated by spaces but can be quoted by " characters +also escape sequences \b, \n, and \t are recognized. The fields are as follows: + +polydir instance_prefix method list_of_uids + +The first field, polydir, is the absolute pathname of the directory to +polyinstantiate. The special string $HOME is replaced with the user's home +directory, and $USER with the username. This field cannot be blank. + +The second field, instance_prefix is the string prefix used to build the +pathname for the instantiation of <polydir>. Depending on the polyinstantiation +method it is then appended with "instance differentiation string" to generate +the final instance directory path. This directory is created if it did not +exist already, and is then bind mounted on the <polydir> to provide an instance +of <polydir> based on the <method> column. The special string $HOME is replaced +with the user's home directory, and $USER with the username. This field cannot +be blank. + +The third field, method, is the method used for polyinstantiation. It can take +these values; "user" for polyinstantiation based on user name, "level" for +polyinstantiation based on process MLS level and user name, "context" for +polyinstantiation based on process security context and user name, "tmpfs" for +mounting tmpfs filesystem as an instance dir, and "tmpdir" for creating +temporary directory as an instance dir which is removed when the user's session +is closed. Methods "context" and "level" are only available with SELinux. This +field cannot be blank. + +The fourth field, list_of_uids, is a comma separated list of user names for +whom the polyinstantiation is not performed. If left blank, polyinstantiation +will be performed for all users. If the list is preceded with a single "~" +character, polyinstantiation is performed only for users in the list. + +The method field can contain also following optional flags separated by : +characters. + +create=mode,owner,group - create the polyinstantiated directory. The mode, +owner and group parameters are optional. The default for mode is determined by +umask, the default owner is the user whose session is opened, the default group +is the primary group of the user. + +iscript=path - path to the instance directory init script. The base directory +for relative paths is /etc/security/namespace.d. + +noinit - instance directory init script will not be executed. + +shared - the instance directories for "context" and "level" methods will not +contain the user name and will be shared among all users. + +The directory where polyinstantiated instances are to be created, must exist +and must have, by default, the mode of 0000. The requirement that the instance +parent be of mode 0000 can be overridden with the command line option +ignore_instance_parent_mode + +In case of context or level polyinstantiation the SELinux context which is used +for polyinstantiation is the context used for executing a new process as +obtained by getexeccon. This context must be set by the calling application or +pam_selinux.so module. If this context is not set the polyinstatiation will be +based just on user name. + +The "instance differentiation string" is <user name> for "user" method and +<user name>_<raw directory context> for "context" and "level" methods. If the +whole string is too long the end of it is replaced with md5sum of itself. Also +when command line option gen_hash is used the whole string is replaced with +md5sum of itself. + +EXAMPLES + +These are some example lines which might be specified in /etc/security/ +namespace.conf. + + +      # The following three lines will polyinstantiate /tmp, +      # /var/tmp and user's home directories. /tmp and /var/tmp +      # will be polyinstantiated based on the security level +      # as well as user name, whereas home directory will be +      # polyinstantiated based on the full security context and user name. +      # Polyinstantiation will not be performed for user root +      # and adm for directories /tmp and /var/tmp, whereas home +      # directories will be polyinstantiated for all users. +      # +      # Note that instance directories do not have to reside inside +      # the polyinstantiated directory. In the examples below, +      # instances of /tmp will be created in /tmp-inst directory, +      # where as instances of /var/tmp and users home directories +      # will reside within the directories that are being +      # polyinstantiated. +      # +      /tmp     /tmp-inst/               level      root,adm +      /var/tmp /var/tmp/tmp-inst/   level      root,adm +      $HOME    $HOME/$USER.inst/inst- context +    + +For the <service>s you need polyinstantiation (login for example) put the +following line in /etc/pam.d/<service> as the last line for session group: + +session required pam_namespace.so [arguments] + +This module also depends on pam_selinux.so setting the context. + diff --git a/modules/pam_namespace/README.xml b/modules/pam_namespace/README.xml new file mode 100644 index 00000000..4ef99c9f --- /dev/null +++ b/modules/pam_namespace/README.xml @@ -0,0 +1,44 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamns SYSTEM "pam_namespace.8.xml"> +--> +<!-- +<!ENTITY nsconf SYSTEM "namespace.conf.5.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_namespace.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_namespace-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_namespace.8.xml" xpointer='xpointer(//refsect1[@id = "pam_namespace-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_namespace.8.xml" xpointer='xpointer(//refsect1[@id = "pam_namespace-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="namespace.conf.5.xml" xpointer='xpointer(//refsect1[@id = "namespace.conf-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="namespace.conf.5.xml" xpointer='xpointer(//refsect1[@id = "namespace.conf-examples"]/*)'/> + </section> + +</article> diff --git a/modules/pam_namespace/argv_parse.c b/modules/pam_namespace/argv_parse.c new file mode 100644 index 00000000..acc76d74 --- /dev/null +++ b/modules/pam_namespace/argv_parse.c @@ -0,0 +1,165 @@ +/* + * argv_parse.c --- utility function for parsing a string into a + * argc, argv array. + * + * This file defines a function argv_parse() which parsing a + * passed-in string, handling double quotes and backslashes, and + * creates an allocated argv vector which can be freed using the + * argv_free() function. + * + * See argv_parse.h for the formal definition of the functions. + * + * Copyright 1999 by Theodore Ts'o. + * + * Permission to use, copy, modify, and distribute this software for + * any purpose with or without fee is hereby granted, provided that + * the above copyright notice and this permission notice appear in all + * copies. THE SOFTWARE IS PROVIDED "AS IS" AND THEODORE TS'O (THE + * AUTHOR) DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, + * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, + * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER + * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION + * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR + * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. (Isn't + * it sick that the U.S. culture of lawsuit-happy lawyers requires + * this kind of disclaimer?) + * + * Version 1.1, modified 2/27/1999 + */ + +#include <stdlib.h> +#include <ctype.h> +#include <string.h> +#include "argv_parse.h" + +#define STATE_WHITESPACE 1 +#define STATE_TOKEN 2 +#define STATE_QUOTED 3 + +/* + * Returns 0 on success, -1 on failure. + */ +int argv_parse(const char *in_buf, int *ret_argc, char ***ret_argv) +{ + int argc = 0, max_argc = 0; + char **argv, **new_argv, *buf, ch; + const char *cp = 0; + char *outcp = 0; + int state = STATE_WHITESPACE; + + buf = malloc(strlen(in_buf)+1); + if (!buf) + return -1; + + max_argc = 0; argc = 0; argv = 0; + outcp = buf; + for (cp = in_buf; (ch = *cp); cp++) { + if (state == STATE_WHITESPACE) { + if (isspace((int) ch)) + continue; + /* Not whitespace, so start a new token */ + state = STATE_TOKEN; + if (argc >= max_argc) { + max_argc += 3; + new_argv = realloc(argv, + (max_argc+1)*sizeof(char *)); + if (!new_argv) { + if (argv) free(argv); + free(buf); + return -1; + } + argv = new_argv; + } + argv[argc++] = outcp; + } + if (state == STATE_QUOTED) { + if (ch == '"') + state = STATE_TOKEN; + else + *outcp++ = ch; + continue; + } + /* Must be processing characters in a word */ + if (isspace((int) ch)) { + /* + * Terminate the current word and start + * looking for the beginning of the next word. + */ + *outcp++ = 0; + state = STATE_WHITESPACE; + continue; + } + if (ch == '"') { + state = STATE_QUOTED; + continue; + } + if (ch == '\\') { + ch = *++cp; + switch (ch) { + case '\0': + ch = '\\'; cp--; break; + case 'n': + ch = '\n'; break; + case 't': + ch = '\t'; break; + case 'b': + ch = '\b'; break; + } + } + *outcp++ = ch; + } + if (state != STATE_WHITESPACE) + *outcp++ = '\0'; + if (argv == 0) { + argv = malloc(sizeof(char *)); + free(buf); + } + argv[argc] = 0; + if (ret_argc) + *ret_argc = argc; + if (ret_argv) + *ret_argv = argv; + return 0; +} + +void argv_free(char **argv) +{ + if (*argv) + free(*argv); + free(argv); +} + +#ifdef DEBUG_ARGV_PARSE +/* + * For debugging + */ + +#include <stdio.h> + +int main(int argc, char **argv) +{ + int ac, ret; + char **av, **cpp; + char buf[256]; + + while (!feof(stdin)) { + if (fgets(buf, sizeof(buf), stdin) == NULL) + break; + ret = argv_parse(buf, &ac, &av); + if (ret != 0) { + printf("Argv_parse returned %d!\n", ret); + continue; + } + printf("Argv_parse returned %d arguments...\n", ac); + for (cpp = av; *cpp; cpp++) { + if (cpp != av) + printf(", "); + printf("'%s'", *cpp); + } + printf("\n"); + argv_free(av); + } + exit(0); +} +#endif diff --git a/modules/pam_namespace/argv_parse.h b/modules/pam_namespace/argv_parse.h new file mode 100644 index 00000000..c7878fc1 --- /dev/null +++ b/modules/pam_namespace/argv_parse.h @@ -0,0 +1,43 @@ +/* + * argv_parse.h --- header file for the argv parser. + * + * This file defines the interface for the functions argv_parse() and + * argv_free(). + * + *********************************************************************** + * int argv_parse(char *in_buf, int *ret_argc, char ***ret_argv) + * + * This function takes as its first argument a string which it will + * parse into an argv argument vector, with each white-space separated + * word placed into its own slot in the argv. This function handles + * double quotes and backslashes so that the parsed words can contain + * special characters. The count of the number words found in the + * parsed string, as well as the argument vector, are returned into + * ret_argc and ret_argv, respectively. + *********************************************************************** + * extern void argv_free(char **argv); + * + * This function frees the argument vector created by argv_parse(). + *********************************************************************** + * + * Copyright 1999 by Theodore Ts'o. + * + * Permission to use, copy, modify, and distribute this software for + * any purpose with or without fee is hereby granted, provided that + * the above copyright notice and this permission notice appear in all + * copies. THE SOFTWARE IS PROVIDED "AS IS" AND THEODORE TS'O (THE + * AUTHOR) DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, + * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, + * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER + * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION + * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR + * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. (Isn't + * it sick that the U.S. culture of lawsuit-happy lawyers requires + * this kind of disclaimer?) + * + * Version 1.1, modified 2/27/1999 + */ + +extern int argv_parse(const char *in_buf, int *ret_argc, char ***ret_argv); +extern void argv_free(char **argv); diff --git a/modules/pam_namespace/md5.c b/modules/pam_namespace/md5.c new file mode 100644 index 00000000..9a060d27 --- /dev/null +++ b/modules/pam_namespace/md5.c @@ -0,0 +1,260 @@ +/* + * $Id: md5.c,v 1.1 2006/06/27 13:07:43 t8m Exp $ + * + * This code implements the MD5 message-digest algorithm. + * The algorithm is due to Ron Rivest. This code was + * written by Colin Plumb in 1993, no copyright is claimed. + * This code is in the public domain; do with it what you wish. + * + * Equivalent code is available from RSA Data Security, Inc. + * This code has been tested against that, and is equivalent, + * except that you don't need to include two pages of legalese + * with every copy. + * + * To compute the message digest of a chunk of bytes, declare an + * MD5Context structure, pass it to MD5Init, call MD5Update as + * needed on buffers full of bytes, and then call MD5Final, which + * will fill a supplied 16-byte array with the digest. + * + */ + +#include <string.h> +#include "md5.h" + +#define MD5Name(x) x + +#if defined(__i386) || defined(__i386__) || defined(__x86_64) || defined(__x86_64__) +#define byteReverse(buf, len) /* Nothing */ +#else +static void byteReverse(unsigned char *buf, unsigned longs); + +/* + * Note: this code is harmless on little-endian machines. + */ +static void byteReverse(unsigned char *buf, unsigned longs) +{ + uint32 t; + do { + t = (uint32) ((unsigned) buf[3] << 8 | buf[2]) << 16 | + ((unsigned) buf[1] << 8 | buf[0]); + *(uint32 *) buf = t; + buf += 4; + } while (--longs); +} +#endif + +/* + * Start MD5 accumulation. Set bit count to 0 and buffer to mysterious + * initialization constants. + */ +void MD5Name(MD5Init)(struct MD5Context *ctx) +{ + ctx->buf[0] = 0x67452301U; + ctx->buf[1] = 0xefcdab89U; + ctx->buf[2] = 0x98badcfeU; + ctx->buf[3] = 0x10325476U; + + ctx->bits[0] = 0; + ctx->bits[1] = 0; +} + +/* + * Update context to reflect the concatenation of another buffer full + * of bytes. + */ +void MD5Name(MD5Update)(struct MD5Context *ctx, unsigned const char *buf, unsigned len) +{ + uint32 t; + + /* Update bitcount */ + + t = ctx->bits[0]; + if ((ctx->bits[0] = t + ((uint32) len << 3)) < t) + ctx->bits[1]++; /* Carry from low to high */ + ctx->bits[1] += len >> 29; + + t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */ + + /* Handle any leading odd-sized chunks */ + + if (t) { + unsigned char *p = (unsigned char *) ctx->in + t; + + t = 64 - t; + if (len < t) { + memcpy(p, buf, len); + return; + } + memcpy(p, buf, t); + byteReverse(ctx->in, 16); + MD5Name(MD5Transform)(ctx->buf, (uint32 *) ctx->in); + buf += t; + len -= t; + } + /* Process data in 64-byte chunks */ + + while (len >= 64) { + memcpy(ctx->in, buf, 64); + byteReverse(ctx->in, 16); + MD5Name(MD5Transform)(ctx->buf, (uint32 *) ctx->in); + buf += 64; + len -= 64; + } + + /* Handle any remaining bytes of data. */ + + memcpy(ctx->in, buf, len); +} + +/* + * Final wrapup - pad to 64-byte boundary with the bit pattern + * 1 0* (64-bit count of bits processed, MSB-first) + */ +void MD5Name(MD5Final)(unsigned char digest[16], struct MD5Context *ctx) +{ + unsigned count; + unsigned char *p; + + /* Compute number of bytes mod 64 */ + count = (ctx->bits[0] >> 3) & 0x3F; + + /* Set the first char of padding to 0x80. This is safe since there is + always at least one byte free */ + p = ctx->in + count; + *p++ = 0x80; + + /* Bytes of padding needed to make 64 bytes */ + count = 64 - 1 - count; + + /* Pad out to 56 mod 64 */ + if (count < 8) { + /* Two lots of padding: Pad the first block to 64 bytes */ + memset(p, 0, count); + byteReverse(ctx->in, 16); + MD5Name(MD5Transform)(ctx->buf, (uint32 *) ctx->in); + + /* Now fill the next block with 56 bytes */ + memset(ctx->in, 0, 56); + } else { + /* Pad block to 56 bytes */ + memset(p, 0, count - 8); + } + byteReverse(ctx->in, 14); + + /* Append length in bits and transform */ + ((uint32 *) ctx->in)[14] = ctx->bits[0]; + ((uint32 *) ctx->in)[15] = ctx->bits[1]; + + MD5Name(MD5Transform)(ctx->buf, (uint32 *) ctx->in); + byteReverse((unsigned char *) ctx->buf, 4); + memcpy(digest, ctx->buf, 16); + memset(ctx, 0, sizeof(ctx)); /* In case it's sensitive */ +} + +/* The four core functions - F1 is optimized somewhat */ + +/* #define F1(x, y, z) (x & y | ~x & z) */ +#define F1(x, y, z) (z ^ (x & (y ^ z))) +#define F2(x, y, z) F1(z, x, y) +#define F3(x, y, z) (x ^ y ^ z) +#define F4(x, y, z) (y ^ (x | ~z)) + +/* This is the central step in the MD5 algorithm. */ +#define MD5STEP(f, w, x, y, z, data, s) \ + ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x ) + +/* + * The core of the MD5 algorithm, this alters an existing MD5 hash to + * reflect the addition of 16 longwords of new data. MD5Update blocks + * the data and converts bytes into longwords for this routine. + */ +void MD5Name(MD5Transform)(uint32 buf[4], uint32 const in[16]) +{ + register uint32 a, b, c, d; + + a = buf[0]; + b = buf[1]; + c = buf[2]; + d = buf[3]; + + MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478U, 7); + MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756U, 12); + MD5STEP(F1, c, d, a, b, in[2] + 0x242070dbU, 17); + MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceeeU, 22); + MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0fafU, 7); + MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62aU, 12); + MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613U, 17); + MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501U, 22); + MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8U, 7); + MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7afU, 12); + MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1U, 17); + MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7beU, 22); + MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122U, 7); + MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193U, 12); + MD5STEP(F1, c, d, a, b, in[14] + 0xa679438eU, 17); + MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821U, 22); + + MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562U, 5); + MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340U, 9); + MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51U, 14); + MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aaU, 20); + MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105dU, 5); + MD5STEP(F2, d, a, b, c, in[10] + 0x02441453U, 9); + MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681U, 14); + MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8U, 20); + MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6U, 5); + MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6U, 9); + MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87U, 14); + MD5STEP(F2, b, c, d, a, in[8] + 0x455a14edU, 20); + MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905U, 5); + MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8U, 9); + MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9U, 14); + MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8aU, 20); + + MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942U, 4); + MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681U, 11); + MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122U, 16); + MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380cU, 23); + MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44U, 4); + MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9U, 11); + MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60U, 16); + MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70U, 23); + MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6U, 4); + MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127faU, 11); + MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085U, 16); + MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05U, 23); + MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039U, 4); + MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5U, 11); + MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8U, 16); + MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665U, 23); + + MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244U, 6); + MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97U, 10); + MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7U, 15); + MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039U, 21); + MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3U, 6); + MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92U, 10); + MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47dU, 15); + MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1U, 21); + MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4fU, 6); + MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0U, 10); + MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314U, 15); + MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1U, 21); + MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82U, 6); + MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235U, 10); + MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bbU, 15); + MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391U, 21); + + buf[0] += a; + buf[1] += b; + buf[2] += c; + buf[3] += d; +} + +void MD5Name(MD5)(unsigned const char *buf, unsigned len, unsigned char digest[16]) +{ + struct MD5Context ctx; + MD5Name(MD5Init)(&ctx); + MD5Name(MD5Update)(&ctx, buf, len); + MD5Name(MD5Final)(digest, &ctx); +} diff --git a/modules/pam_namespace/md5.h b/modules/pam_namespace/md5.h new file mode 100644 index 00000000..73f85833 --- /dev/null +++ b/modules/pam_namespace/md5.h @@ -0,0 +1,28 @@ + +#ifndef MD5_H +#define MD5_H + +typedef unsigned int uint32; + +struct MD5Context { + uint32 buf[4]; + uint32 bits[2]; + unsigned char in[64]; +}; + +#define MD5_DIGEST_LENGTH 16 + +void MD5Init(struct MD5Context *); +void MD5Update(struct MD5Context *, unsigned const char *, unsigned); +void MD5Final(unsigned char digest[MD5_DIGEST_LENGTH], struct MD5Context *); +void MD5Transform(uint32 buf[4], uint32 const in[MD5_DIGEST_LENGTH]); +void MD5(unsigned const char *, unsigned, unsigned char digest[MD5_DIGEST_LENGTH]); + + +/* + * This is needed to make RSAREF happy on some MS-DOS compilers. + */ + +typedef struct MD5Context MD5_CTX; + +#endif /* MD5_H */ diff --git a/modules/pam_namespace/namespace.conf b/modules/pam_namespace/namespace.conf new file mode 100644 index 00000000..f973225f --- /dev/null +++ b/modules/pam_namespace/namespace.conf @@ -0,0 +1,28 @@ +# /etc/security/namespace.conf +# +# See /usr/share/doc/pam-*/txts/README.pam_namespace for more information. +# +# Uncommenting the following three lines will polyinstantiate +# /tmp, /var/tmp and user's home directories. /tmp and /var/tmp will +# be polyinstantiated based on the MLS level part of the security context as well as user +# name, Polyinstantion will not be performed for user root and adm for directories +# /tmp and /var/tmp, whereas home directories will be polyinstantiated for all users. +# The user name and context is appended to the instance prefix. +# +# Note that instance directories do not have to reside inside the +# polyinstantiated directory. In the examples below, instances of /tmp +# will be created in /tmp-inst directory, where as instances of /var/tmp +# and users home directories will reside within the directories that +# are being polyinstantiated. +# +# Instance parent directories must exist for the polyinstantiation +# mechanism to work. By default, they should be created with the mode +# of 000. pam_namespace module will enforce this mode unless it +# is explicitly called with an argument to ignore the mode of the +# instance parent. System administrators should use this argument with +# caution, as it will reduce security and isolation achieved by +# polyinstantiation. +# +#/tmp /tmp-inst/ level root,adm +#/var/tmp /var/tmp/tmp-inst/ level root,adm +#$HOME $HOME/$USER.inst/ level diff --git a/modules/pam_namespace/namespace.conf.5 b/modules/pam_namespace/namespace.conf.5 new file mode 100644 index 00000000..9e293dbd --- /dev/null +++ b/modules/pam_namespace/namespace.conf.5 @@ -0,0 +1,139 @@ +.\" Title: namespace.conf +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "NAMESPACE\.CONF" "5" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +namespace.conf - the namespace configuration file +.SH "DESCRIPTION" +.PP +The +\fIpam_namespace\.so\fR +module allows setup of private namespaces with polyinstantiated directories\. Directories can be polyinstantiated based on user name or, in the case of SELinux, user name, sensitivity level or complete security context\. If an executable script +\fI/etc/security/namespace\.init\fR +exists, it is used to initialize the namespace every time a new instance directory is setup\. The script receives the polyinstantiated directory path and the instance directory path as its arguments\. +.PP +The +\fI/etc/security/namespace\.conf\fR +file specifies which directories are polyinstantiated, how they are polyinstantiated, how instance directories would be named, and any users for whom polyinstantiation would not be performed\. +.PP +When someone logs in, the file +\fInamespace\.conf\fR +is scanned\. Comments are marked by +\fI#\fR +characters\. Each non comment line represents one polyinstantiated directory\. The fields are separated by spaces but can be quoted by +\fI"\fR +characters also escape sequences +\fI\eb\fR, +\fI\en\fR, and +\fI\et\fR +are recognized\. The fields are as follows: +.PP +\fIpolydir\fR +\fIinstance_prefix\fR +\fImethod\fR +\fIlist_of_uids\fR +.PP +The first field, +\fIpolydir\fR, is the absolute pathname of the directory to polyinstantiate\. The special string +\fI$HOME\fR +is replaced with the user\'s home directory, and +\fI$USER\fR +with the username\. This field cannot be blank\. +.PP +The second field, +\fIinstance_prefix\fR +is the string prefix used to build the pathname for the instantiation of <polydir>\. Depending on the polyinstantiation +\fImethod\fR +it is then appended with "instance differentiation string" to generate the final instance directory path\. This directory is created if it did not exist already, and is then bind mounted on the <polydir> to provide an instance of <polydir> based on the <method> column\. The special string +\fI$HOME\fR +is replaced with the user\'s home directory, and +\fI$USER\fR +with the username\. This field cannot be blank\. +.PP +The third field, +\fImethod\fR, is the method used for polyinstantiation\. It can take these values; "user" for polyinstantiation based on user name, "level" for polyinstantiation based on process MLS level and user name, "context" for polyinstantiation based on process security context and user name, "tmpfs" for mounting tmpfs filesystem as an instance dir, and "tmpdir" for creating temporary directory as an instance dir which is removed when the user\'s session is closed\. Methods "context" and "level" are only available with SELinux\. This field cannot be blank\. +.PP +The fourth field, +\fIlist_of_uids\fR, is a comma separated list of user names for whom the polyinstantiation is not performed\. If left blank, polyinstantiation will be performed for all users\. If the list is preceded with a single "~" character, polyinstantiation is performed only for users in the list\. +.PP +The +\fImethod\fR +field can contain also following optional flags separated by +\fI:\fR +characters\. +.PP +\fIcreate\fR=\fImode\fR,\fIowner\fR,\fIgroup\fR +\- create the polyinstantiated directory\. The mode, owner and group parameters are optional\. The default for mode is determined by umask, the default owner is the user whose session is opened, the default group is the primary group of the user\. +.PP +\fIiscript\fR=\fIpath\fR +\- path to the instance directory init script\. The base directory for relative paths is +\fI/etc/security/namespace\.d\fR\. +.PP +\fInoinit\fR +\- instance directory init script will not be executed\. +.PP +\fIshared\fR +\- the instance directories for "context" and "level" methods will not contain the user name and will be shared among all users\. +.PP +The directory where polyinstantiated instances are to be created, must exist and must have, by default, the mode of 0000\. The requirement that the instance parent be of mode 0000 can be overridden with the command line option +\fIignore_instance_parent_mode\fR +.PP +In case of context or level polyinstantiation the SELinux context which is used for polyinstantiation is the context used for executing a new process as obtained by getexeccon\. This context must be set by the calling application or +\fIpam_selinux\.so\fR +module\. If this context is not set the polyinstatiation will be based just on user name\. +.PP +The "instance differentiation string" is <user name> for "user" method and <user name>_<raw directory context> for "context" and "level" methods\. If the whole string is too long the end of it is replaced with md5sum of itself\. Also when command line option +\fIgen_hash\fR +is used the whole string is replaced with md5sum of itself\. +.SH "EXAMPLES" +.PP +These are some example lines which might be specified in +\fI/etc/security/namespace\.conf\fR\. +.sp +.RS 4 +.nf + # The following three lines will polyinstantiate /tmp, + # /var/tmp and user\'s home directories\. /tmp and /var/tmp + # will be polyinstantiated based on the security level + # as well as user name, whereas home directory will be + # polyinstantiated based on the full security context and user name\. + # Polyinstantiation will not be performed for user root + # and adm for directories /tmp and /var/tmp, whereas home + # directories will be polyinstantiated for all users\. + # + # Note that instance directories do not have to reside inside + # the polyinstantiated directory\. In the examples below, + # instances of /tmp will be created in /tmp\-inst directory, + # where as instances of /var/tmp and users home directories + # will reside within the directories that are being + # polyinstantiated\. + # + /tmp /tmp\-inst/ level root,adm + /var/tmp /var/tmp/tmp\-inst/ level root,adm + $HOME $HOME/$USER\.inst/inst\- context + +.fi +.RE +.PP +For the <service>s you need polyinstantiation (login for example) put the following line in /etc/pam\.d/<service> as the last line for session group: +.PP +session required pam_namespace\.so [arguments] +.PP +This module also depends on pam_selinux\.so setting the context\. +.SH "SEE ALSO" +.PP + +\fBpam_namespace\fR(8), +\fBpam.d\fR(5), +\fBpam\fR(8) +.SH "AUTHORS" +.PP +The namespace\.conf manual page was written by Janak Desai <janak@us\.ibm\.com>\. More features added by Tomas Mraz <tmraz@redhat\.com>\. diff --git a/modules/pam_namespace/namespace.conf.5.xml b/modules/pam_namespace/namespace.conf.5.xml new file mode 100644 index 00000000..a1769600 --- /dev/null +++ b/modules/pam_namespace/namespace.conf.5.xml @@ -0,0 +1,210 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="namespace.conf"> + + <refmeta> + <refentrytitle>namespace.conf</refentrytitle> + <manvolnum>5</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv> + <refname>namespace.conf</refname> + <refpurpose>the namespace configuration file</refpurpose> + </refnamediv> + + + <refsect1 id='namespace.conf-description'> + <title>DESCRIPTION</title> + + <para> + The <emphasis>pam_namespace.so</emphasis> module allows setup of + private namespaces with polyinstantiated directories. + Directories can be polyinstantiated based on user name + or, in the case of SELinux, user name, sensitivity level or complete security context. If an + executable script <filename>/etc/security/namespace.init</filename> + exists, it is used to initialize the namespace every time a new instance + directory is setup. The script receives the polyinstantiated + directory path and the instance directory path as its arguments. + </para> + + <para> + The <filename>/etc/security/namespace.conf</filename> file specifies + which directories are polyinstantiated, how they are polyinstantiated, + how instance directories would be named, and any users for whom + polyinstantiation would not be performed. + </para> + + <para> + When someone logs in, the file <filename>namespace.conf</filename> is + scanned. Comments are marked by <emphasis>#</emphasis> characters. + Each non comment line represents one polyinstantiated + directory. The fields are separated by spaces but can be quoted by + <emphasis>"</emphasis> characters also escape + sequences <emphasis>\b</emphasis>, <emphasis>\n</emphasis>, and + <emphasis>\t</emphasis> are recognized. The fields are as follows: + </para> + + <para><replaceable>polydir</replaceable> <replaceable>instance_prefix</replaceable> <replaceable>method</replaceable> <replaceable>list_of_uids</replaceable> + </para> + + <para> + The first field, <replaceable>polydir</replaceable>, is the absolute + pathname of the directory to polyinstantiate. The special string + <emphasis>$HOME</emphasis> is replaced with the user's home directory, + and <emphasis>$USER</emphasis> with the username. This field cannot + be blank. + </para> + + <para> + The second field, <replaceable>instance_prefix</replaceable> is + the string prefix used to build the pathname for the instantiation + of <polydir>. Depending on the polyinstantiation + <replaceable>method</replaceable> it is then appended with + "instance differentiation string" to generate the final + instance directory path. This directory is created if it did not exist + already, and is then bind mounted on the <polydir> to provide an + instance of <polydir> based on the <method> column. + The special string <emphasis>$HOME</emphasis> is replaced with the + user's home directory, and <emphasis>$USER</emphasis> with the username. + This field cannot be blank. + </para> + + <para> + The third field, <replaceable>method</replaceable>, is the method + used for polyinstantiation. It can take these values; "user" + for polyinstantiation based on user name, "level" for + polyinstantiation based on process MLS level and user name, "context" for + polyinstantiation based on process security context and user name, + "tmpfs" for mounting tmpfs filesystem as an instance dir, and + "tmpdir" for creating temporary directory as an instance dir which is + removed when the user's session is closed. + Methods "context" and "level" are only available with SELinux. This + field cannot be blank. + </para> + + <para> + The fourth field, <replaceable>list_of_uids</replaceable>, is + a comma separated list of user names for whom the polyinstantiation + is not performed. If left blank, polyinstantiation will be performed + for all users. If the list is preceded with a single "~" character, + polyinstantiation is performed only for users in the list. + </para> + + <para> + The <replaceable>method</replaceable> field can contain also following + optional flags separated by <emphasis>:</emphasis> characters. + </para> + + <para><emphasis>create</emphasis>=<replaceable>mode</replaceable>,<replaceable>owner</replaceable>,<replaceable>group</replaceable> + - create the polyinstantiated directory. The mode, owner and group parameters + are optional. The default for mode is determined by umask, the default + owner is the user whose session is opened, the default group is the + primary group of the user. + </para> + + <para><emphasis>iscript</emphasis>=<replaceable>path</replaceable> + - path to the instance directory init script. The base directory for relative + paths is <filename>/etc/security/namespace.d</filename>. + </para> + + <para><emphasis>noinit</emphasis> + - instance directory init script will not be executed. + </para> + + <para><emphasis>shared</emphasis> + - the instance directories for "context" and "level" methods will not + contain the user name and will be shared among all users. + </para> + + <para> + The directory where polyinstantiated instances are to be + created, must exist and must have, by default, the mode of 0000. The + requirement that the instance parent be of mode 0000 can be overridden + with the command line option <emphasis>ignore_instance_parent_mode</emphasis> + </para> + + <para> + In case of context or level polyinstantiation the SELinux context + which is used for polyinstantiation is the context used for executing + a new process as obtained by getexeccon. This context must be set + by the calling application or <filename>pam_selinux.so</filename> + module. If this context is not set the polyinstatiation will be + based just on user name. + </para> + + <para> + The "instance differentiation string" is <user name> for "user" + method and <user name>_<raw directory context> for "context" + and "level" methods. If the whole string is too long the end of it is + replaced with md5sum of itself. Also when command line option + <emphasis>gen_hash</emphasis> is used the whole string is replaced + with md5sum of itself. + </para> + + </refsect1> + + <refsect1 id="namespace.conf-examples"> + <title>EXAMPLES</title> + <para> + These are some example lines which might be specified in + <filename>/etc/security/namespace.conf</filename>. + </para> + + <literallayout> + # The following three lines will polyinstantiate /tmp, + # /var/tmp and user's home directories. /tmp and /var/tmp + # will be polyinstantiated based on the security level + # as well as user name, whereas home directory will be + # polyinstantiated based on the full security context and user name. + # Polyinstantiation will not be performed for user root + # and adm for directories /tmp and /var/tmp, whereas home + # directories will be polyinstantiated for all users. + # + # Note that instance directories do not have to reside inside + # the polyinstantiated directory. In the examples below, + # instances of /tmp will be created in /tmp-inst directory, + # where as instances of /var/tmp and users home directories + # will reside within the directories that are being + # polyinstantiated. + # + /tmp /tmp-inst/ level root,adm + /var/tmp /var/tmp/tmp-inst/ level root,adm + $HOME $HOME/$USER.inst/inst- context + </literallayout> + + <para> + For the <service>s you need polyinstantiation (login for example) + put the following line in /etc/pam.d/<service> as the last line for + session group: + </para> + + <para> + session required pam_namespace.so [arguments] + </para> + + <para> + This module also depends on pam_selinux.so setting the context. + </para> + + </refsect1> + + <refsect1 id="namespace.conf-see_also"> + <title>SEE ALSO</title> + <para> + <citerefentry><refentrytitle>pam_namespace</refentrytitle><manvolnum>8</manvolnum></citerefentry>, + <citerefentry><refentrytitle>pam.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum></citerefentry> + </para> + </refsect1> + + <refsect1 id="namespace.conf-author"> + <title>AUTHORS</title> + <para> + The namespace.conf manual page was written by Janak Desai <janak@us.ibm.com>. + More features added by Tomas Mraz <tmraz@redhat.com>. + </para> + </refsect1> +</refentry> diff --git a/modules/pam_namespace/namespace.init b/modules/pam_namespace/namespace.init new file mode 100755 index 00000000..424c6d0c --- /dev/null +++ b/modules/pam_namespace/namespace.init @@ -0,0 +1,24 @@ +#!/bin/sh -p +# It receives polydir path as $1, the instance path as $2, +# a flag whether the instance dir was newly created (0 - no, 1 - yes) in $3, +# and user name in $4. +# +# The following section will copy the contents of /etc/skel if this is a +# newly created home directory. +if [ "$3" = 1 ]; then + # This line will fix the labeling on all newly created directories + [ -x /sbin/restorecon ] && /sbin/restorecon "$1" + user="$4" + passwd=$(getent passwd "$user") + homedir=$(echo "$passwd" | cut -f6 -d":") + if [ "$1" = "$homedir" ]; then + gid=$(echo "$passwd" | cut -f4 -d":") + cp -rT /etc/skel "$homedir" + chown -R "$user":"$gid" "$homedir" + mode=$(awk '/^UMASK/{gsub("#.*$", "", $2); printf "%o", and(0777,compl(strtonum("0" $2))); exit}' /etc/login.defs) + chmod ${mode:-700} "$homedir" + [ -x /sbin/restorecon ] && /sbin/restorecon -R "$homedir" + fi +fi + +exit 0 diff --git a/modules/pam_namespace/pam_namespace.8 b/modules/pam_namespace/pam_namespace.8 new file mode 100644 index 00000000..485e06b5 --- /dev/null +++ b/modules/pam_namespace/pam_namespace.8 @@ -0,0 +1,157 @@ +.\" Title: pam_namespace +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_NAMESPACE" "8" "04/16/2008" "Linux-PAM Manual" "Linux-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_namespace - PAM module for configuring namespace for a session +.SH "SYNOPSIS" +.HP 17 +\fBpam_namespace\.so\fR [debug] [unmnt_remnt] [unmnt_only] [require_selinux] [gen_hash] [ignore_config_error] [ignore_instance_parent_mode] [no_unmount_on_close] [use_current_context] [use_default_context] +.SH "DESCRIPTION" +.PP +The pam_namespace PAM module sets up a private namespace for a session with polyinstantiated directories\. A polyinstantiated directory provides a different instance of itself based on user name, or when using SELinux, user name, security context or both\. If an executable script +\fI/etc/security/namespace\.init\fR +exists, it is used to initialize the namespace every time a new instance directory is setup\. The script receives the polyinstantiated directory path, the instance directory path, flag whether the instance directory was newly created (0 for no, 1 for yes), and the user name as its arguments\. +.PP +The pam_namespace module disassociates the session namespace from the parent namespace\. Any mounts/unmounts performed in the parent namespace, such as mounting of devices, are not reflected in the session namespace\. To propagate selected mount/unmount events from the parent namespace into the disassociated session namespace, an administrator may use the special shared\-subtree feature\. For additional information on shared\-subtree feature, please refer to the mount(8) man page and the shared\-subtree description at http://lwn\.net/Articles/159077 and http://lwn\.net/Articles/159092\. +.SH "OPTIONS" +.PP +\fBdebug\fR +.RS 4 +A lot of debug information is logged using syslog +.RE +.PP +\fBunmnt_remnt\fR +.RS 4 +For programs such as su and newrole, the login session has already setup a polyinstantiated namespace\. For these programs, polyinstantiation is performed based on new user id or security context, however the command first needs to undo the polyinstantiation performed by login\. This argument instructs the command to first undo previous polyinstantiation before proceeding with new polyinstantiation based on new id/context +.RE +.PP +\fBunmnt_only\fR +.RS 4 +For trusted programs that want to undo any existing bind mounts and process instance directories on their own, this argument allows them to unmount currently mounted instance directories +.RE +.PP +\fBrequire_selinux\fR +.RS 4 +If selinux is not enabled, return failure +.RE +.PP +\fBgen_hash\fR +.RS 4 +Instead of using the security context string for the instance name, generate and use its md5 hash\. +.RE +.PP +\fBignore_config_error\fR +.RS 4 +If a line in the configuration file corresponding to a polyinstantiated directory contains format error, skip that line process the next line\. Without this option, pam will return an error to the calling program resulting in termination of the session\. +.RE +.PP +\fBignore_instance_parent_mode\fR +.RS 4 +Instance parent directories by default are expected to have the restrictive mode of 000\. Using this option, an administrator can choose to ignore the mode of the instance parent\. This option should be used with caution as it will reduce security and isolation goals of the polyinstantiation mechanism\. +.RE +.PP +\fBno_unmount_on_close\fR +.RS 4 +For certain trusted programs such as newrole, open session is called from a child process while the parent perfoms close session and pam end functions\. For these commands use this option to instruct pam_close_session to not unmount the bind mounted polyinstantiated directory in the parent\. +.RE +.PP +\fBuse_current_context\fR +.RS 4 +Useful for services which do not change the SELinux context with setexeccon call\. The module will use the current SELinux context of the calling process for the level and context polyinstantiation\. +.RE +.PP +\fBuse_default_context\fR +.RS 4 +Useful for services which do not use pam_selinux for changing the SELinux context with setexeccon call\. The module will use the default SELinux context of the user for the level and context polyinstantiation\. +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +The +\fBsession\fR +service is supported\. The module must not be called from multithreaded processes\. +.SH "RETURN VALUES" +.PP +PAM_SUCCESS +.RS 4 +Namespace setup was successful\. +.RE +.PP +PAM_SERVICE_ERR +.RS 4 +Unexpected system error occurred while setting up namespace\. +.RE +.PP +PAM_SESSION_ERR +.RS 4 +Unexpected namespace configuration error occurred\. +.RE +.SH "FILES" +.PP +\fI/etc/security/namespace\.conf\fR +.RS 4 +Main configuration file +.RE +.PP +\fI/etc/security/namespace\.d\fR +.RS 4 +Directory for additional configuration files +.RE +.PP +\fI/etc/security/namespace\.init\fR +.RS 4 +Init script for instance directories +.RE +.SH "EXAMPLES" +.PP +For the <service>s you need polyinstantiation (login for example) put the following line in /etc/pam\.d/<service> as the last line for session group: +.PP +session required pam_namespace\.so [arguments] +.PP +To use polyinstantiation with graphical display manager gdm, insert the following line, before exit 0, in /etc/gdm/PostSession/Default: +.PP +/usr/sbin/gdm\-safe\-restart +.PP +This allows gdm to restart after each session and appropriately adjust namespaces of display manager and the X server\. If polyinstantiation of /tmp is desired along with the graphical environment, then additional configuration changes are needed to address the interaction of X server and font server namespaces with their use of /tmp to create communication sockets\. Please use the initialization script +\fI/etc/security/namespace\.init\fR +to ensure that the X server and its clients can appropriately access the communication socket X0\. Please refer to the sample instructions provided in the comment section of the instance initialization script +\fI/etc/security/namespace\.init\fR\. In addition, perform the following changes to use graphical environment with polyinstantiation of /tmp: +.PP + +.sp +.RS 4 +.nf + 1\. Disable the use of font server by commenting out "FontPath" + line in /etc/X11/xorg\.conf\. If you do want to use the font server + then you will have to augment the instance initialization + script to appropriately provide /tmp/\.font\-unix from the + polyinstantiated /tmp\. + 2\. Ensure that the gdm service is setup to use pam_namespace, + as described above, by modifying /etc/pam\.d/gdm\. + 3\. Ensure that the display manager is configured to restart X server + with each new session\. This default setup can be verified by + making sure that /usr/share/gdm/defaults\.conf contains + "AlwaysRestartServer=true", and it is not overridden by + /etc/gdm/custom\.conf\. + +.fi +.RE +.sp +.SH "SEE ALSO" +.PP + +\fBnamespace.conf\fR(5), +\fBpam.d\fR(8), +\fBmount\fR(8), +\fBpam\fR(8)\. +.SH "AUTHORS" +.PP +The namespace setup scheme was designed by Stephen Smalley, Janak Desai and Chad Sellers\. The pam_namespace PAM module was developed by Janak Desai <janak@us\.ibm\.com>, Chad Sellers <csellers@tresys\.com> and Steve Grubb <sgrubb@redhat\.com>\. Additional improvements by Xavier Toth <txtoth@gmail\.com> and Tomas Mraz <tmraz@redhat\.com>\. diff --git a/modules/pam_namespace/pam_namespace.8.xml b/modules/pam_namespace/pam_namespace.8.xml new file mode 100644 index 00000000..32c5359d --- /dev/null +++ b/modules/pam_namespace/pam_namespace.8.xml @@ -0,0 +1,390 @@ +<?xml version="1.0" encoding="ISO-8859-1"?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN" + "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd"> + +<refentry id='pam_namespace'> + + <refmeta> + <refentrytitle>pam_namespace</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class='setdesc'>Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id='pam_namespace-name'> + <refname>pam_namespace</refname> + <refpurpose> + PAM module for configuring namespace for a session + </refpurpose> + </refnamediv> + +<!-- body begins here --> + + <refsynopsisdiv> + <cmdsynopsis id="pam_namespace-cmdsynopsis"> + <command>pam_namespace.so</command> + <arg choice="opt"> + debug + </arg> + <arg choice="opt"> + unmnt_remnt + </arg> + <arg choice="opt"> + unmnt_only + </arg> + <arg choice="opt"> + require_selinux + </arg> + <arg choice="opt"> + gen_hash + </arg> + <arg choice="opt"> + ignore_config_error + </arg> + <arg choice="opt"> + ignore_instance_parent_mode + </arg> + <arg choice="opt"> + no_unmount_on_close + </arg> + <arg choice="opt"> + use_current_context + </arg> + <arg choice="opt"> + use_default_context + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + + <refsect1 id="pam_namespace-description"> + <title>DESCRIPTION</title> + <para> + The pam_namespace PAM module sets up a private namespace for a session + with polyinstantiated directories. A polyinstantiated directory + provides a different instance of itself based on user name, or when + using SELinux, user name, security context or both. If an executable + script <filename>/etc/security/namespace.init</filename> exists, it + is used to initialize the namespace every time a new instance + directory is setup. The script receives the polyinstantiated + directory path, the instance directory path, flag whether the instance + directory was newly created (0 for no, 1 for yes), and the user name + as its arguments. + </para> + + <para> + The pam_namespace module disassociates the session namespace from + the parent namespace. Any mounts/unmounts performed in the parent + namespace, such as mounting of devices, are not reflected in the + session namespace. To propagate selected mount/unmount events from + the parent namespace into the disassociated session namespace, an + administrator may use the special shared-subtree feature. For + additional information on shared-subtree feature, please refer to + the mount(8) man page and the shared-subtree description at + http://lwn.net/Articles/159077 and http://lwn.net/Articles/159092. + </para> + + </refsect1> + + <refsect1 id="pam_namespace-options"> + <title>OPTIONS</title> + <variablelist> + + <varlistentry> + <term> + <option>debug</option> + </term> + <listitem> + <para> + A lot of debug information is logged using syslog + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>unmnt_remnt</option> + </term> + <listitem> + <para> + For programs such as su and newrole, the login + session has already setup a polyinstantiated + namespace. For these programs, polyinstantiation + is performed based on new user id or security + context, however the command first needs to + undo the polyinstantiation performed by login. + This argument instructs the command to + first undo previous polyinstantiation before + proceeding with new polyinstantiation based on + new id/context + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>unmnt_only</option> + </term> + <listitem> + <para> + For trusted programs that want to undo any + existing bind mounts and process instance + directories on their own, this argument allows + them to unmount currently mounted instance + directories + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>require_selinux</option> + </term> + <listitem> + <para> + If selinux is not enabled, return failure + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>gen_hash</option> + </term> + <listitem> + <para> + Instead of using the security context string + for the instance name, generate and use its + md5 hash. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>ignore_config_error</option> + </term> + <listitem> + <para> + If a line in the configuration file corresponding + to a polyinstantiated directory contains format + error, skip that line process the next line. + Without this option, pam will return an error + to the calling program resulting in termination + of the session. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>ignore_instance_parent_mode</option> + </term> + <listitem> + <para> + Instance parent directories by default are expected to have + the restrictive mode of 000. Using this option, an administrator + can choose to ignore the mode of the instance parent. This option + should be used with caution as it will reduce security and + isolation goals of the polyinstantiation mechanism. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>no_unmount_on_close</option> + </term> + <listitem> + <para> + For certain trusted programs such as newrole, open session + is called from a child process while the parent perfoms + close session and pam end functions. For these commands + use this option to instruct pam_close_session to not + unmount the bind mounted polyinstantiated directory in the + parent. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>use_current_context</option> + </term> + <listitem> + <para> + Useful for services which do not change the SELinux context + with setexeccon call. The module will use the current SELinux + context of the calling process for the level and context + polyinstantiation. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>use_default_context</option> + </term> + <listitem> + <para> + Useful for services which do not use pam_selinux for changing + the SELinux context with setexeccon call. The module will use + the default SELinux context of the user for the level and context + polyinstantiation. + </para> + </listitem> + </varlistentry> + + </variablelist> + </refsect1> + + <refsect1 id="pam_namespace-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + The <option>session</option> service is supported. The module must not + be called from multithreaded processes. + </para> + </refsect1> + + <refsect1 id="pam_namespace-return_values"> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + Namespace setup was successful. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_SERVICE_ERR</term> + <listitem> + <para> + Unexpected system error occurred while setting up namespace. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_SESSION_ERR</term> + <listitem> + <para> + Unexpected namespace configuration error occurred. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_namespace-files"> + <title>FILES</title> + <variablelist> + <varlistentry> + <term><filename>/etc/security/namespace.conf</filename></term> + <listitem> + <para>Main configuration file</para> + </listitem> + </varlistentry> + + <varlistentry> + <term><filename>/etc/security/namespace.d</filename></term> + <listitem> + <para>Directory for additional configuration files</para> + </listitem> + </varlistentry> + + <varlistentry> + <term><filename>/etc/security/namespace.init</filename></term> + <listitem> + <para>Init script for instance directories</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_namespace-examples"> + <title>EXAMPLES</title> + + <para> + For the <service>s you need polyinstantiation (login for example) + put the following line in /etc/pam.d/<service> as the last line for + session group: + </para> + + <para> + session required pam_namespace.so [arguments] + </para> + + <para> + To use polyinstantiation with graphical display manager gdm, insert the + following line, before exit 0, in /etc/gdm/PostSession/Default: + </para> + + <para> + /usr/sbin/gdm-safe-restart + </para> + + <para> + This allows gdm to restart after each session and appropriately adjust + namespaces of display manager and the X server. If polyinstantiation + of /tmp is desired along with the graphical environment, then additional + configuration changes are needed to address the interaction of X server + and font server namespaces with their use of /tmp to create + communication sockets. Please use the initialization script + <filename>/etc/security/namespace.init</filename> to ensure that + the X server and its clients can appropriately access the + communication socket X0. Please refer to the sample instructions + provided in the comment section of the instance initialization script + <filename>/etc/security/namespace.init</filename>. In addition, + perform the following changes to use graphical environment with + polyinstantiation of /tmp: + </para> + + <para> + <literallayout> + 1. Disable the use of font server by commenting out "FontPath" + line in /etc/X11/xorg.conf. If you do want to use the font server + then you will have to augment the instance initialization + script to appropriately provide /tmp/.font-unix from the + polyinstantiated /tmp. + 2. Ensure that the gdm service is setup to use pam_namespace, + as described above, by modifying /etc/pam.d/gdm. + 3. Ensure that the display manager is configured to restart X server + with each new session. This default setup can be verified by + making sure that /usr/share/gdm/defaults.conf contains + "AlwaysRestartServer=true", and it is not overridden by + /etc/gdm/custom.conf. + </literallayout> + </para> + + </refsect1> + + <refsect1 id="pam_namespace-see_also"> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>namespace.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>mount</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>. + </para> + </refsect1> + + <refsect1 id="pam_namespace-authors"> + <title>AUTHORS</title> + <para> + The namespace setup scheme was designed by Stephen Smalley, Janak Desai + and Chad Sellers. + The pam_namespace PAM module was developed by Janak Desai <janak@us.ibm.com>, + Chad Sellers <csellers@tresys.com> and Steve Grubb <sgrubb@redhat.com>. + Additional improvements by Xavier Toth <txtoth@gmail.com> and Tomas Mraz + <tmraz@redhat.com>. + </para> + </refsect1> +</refentry> diff --git a/modules/pam_namespace/pam_namespace.c b/modules/pam_namespace/pam_namespace.c new file mode 100644 index 00000000..80c51443 --- /dev/null +++ b/modules/pam_namespace/pam_namespace.c @@ -0,0 +1,1913 @@ +/****************************************************************************** + * A module for Linux-PAM that will set the default namespace after + * establishing a session via PAM. + * + * (C) Copyright IBM Corporation 2005 + * (C) Copyright Red Hat, Inc. 2006, 2008 + * All Rights Reserved. + * + * Written by: Janak Desai <janak@us.ibm.com> + * With Revisions by: Steve Grubb <sgrubb@redhat.com> + * Contributions by: Xavier Toth <txtoth@gmail.com>, + * Tomas Mraz <tmraz@redhat.com> + * Derived from a namespace setup patch by Chad Sellers <cdselle@tycho.nsa.gov> + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * on the rights to use, copy, modify, merge, publish, distribute, sub + * license, and/or sell copies of the Software, and to permit persons to whom + * the Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL + * IBM AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + */ + +#include "pam_namespace.h" +#include "argv_parse.h" + +/* + * Adds an entry for a polyinstantiated directory to the linked list of + * polyinstantiated directories. It is called from process_line() while + * parsing the namespace configuration file. + */ +static void add_polydir_entry(struct instance_data *idata, + struct polydir_s *ent) +{ + /* Now attach to linked list */ + ent->next = NULL; + if (idata->polydirs_ptr == NULL) + idata->polydirs_ptr = ent; + else { + struct polydir_s *tail; + + tail = idata->polydirs_ptr; + while (tail->next) + tail = tail->next; + tail->next = ent; + } +} + +static void del_polydir(struct polydir_s *poly) +{ + free(poly->uid); + free(poly->init_script); + free(poly); +} + +/* + * Deletes all the entries in the linked list. + */ +static void del_polydir_list(struct polydir_s *polydirs_ptr) +{ + struct polydir_s *dptr = polydirs_ptr; + + while (dptr) { + struct polydir_s *tptr = dptr; + dptr = dptr->next; + del_polydir(tptr); + } +} + +static void cleanup_data(pam_handle_t *pamh UNUSED , void *data, int err UNUSED) +{ + del_polydir_list(data); +} + +static char *expand_variables(const char *orig, const char *var_names[], const char *var_values[]) +{ + const char *src = orig; + char *dst; + char *expanded; + char c; + size_t dstlen = 0; + while (*src) { + if (*src == '$') { + int i; + for (i = 0; var_names[i]; i++) { + int namelen = strlen(var_names[i]); + if (strncmp(var_names[i], src+1, namelen) == 0) { + dstlen += strlen(var_values[i]) - 1; /* $ */ + src += namelen; + break; + } + } + } + ++dstlen; + ++src; + } + if ((dst=expanded=malloc(dstlen + 1)) == NULL) + return NULL; + src = orig; + while ((c=*src) != '\0') { + if (c == '$') { + int i; + for (i = 0; var_names[i]; i++) { + int namelen = strlen(var_names[i]); + if (strncmp(var_names[i], src+1, namelen) == 0) { + dst = stpcpy(dst, var_values[i]); + --dst; + c = *dst; /* replace $ */ + src += namelen; + break; + } + } + } + *dst = c; + ++dst; + ++src; + } + *dst = '\0'; + return expanded; +} + +static int parse_create_params(char *params, struct polydir_s *poly) +{ + char *sptr; + struct passwd *pwd; + struct group *grp; + + poly->mode = (mode_t)ULONG_MAX; + poly->owner = (uid_t)ULONG_MAX; + poly->group = (gid_t)ULONG_MAX; + + if (*params != '=') + return 0; + params++; + + params = strtok_r(params, ",", &sptr); + if (params == NULL) + return 0; + + errno = 0; + poly->mode = (mode_t)strtoul(params, NULL, 0); + if (errno != 0) { + poly->mode = (mode_t)ULONG_MAX; + } + + params = strtok_r(NULL, ",", &sptr); + if (params == NULL) + return 0; + + pwd = getpwnam(params); /* session modules are not reentrant */ + if (pwd == NULL) + return -1; + poly->owner = pwd->pw_uid; + + params = strtok_r(NULL, ",", &sptr); + if (params == NULL) { + poly->group = pwd->pw_gid; + return 0; + } + grp = getgrnam(params); + if (grp == NULL) + return -1; + poly->group = grp->gr_gid; + + return 0; +} + +static int parse_iscript_params(char *params, struct polydir_s *poly) +{ + if (*params != '=') + return 0; + params++; + + if (*params != '\0') { + if (*params != '/') { /* path is relative to NAMESPACE_D_DIR */ + if (asprintf(&poly->init_script, "%s%s", NAMESPACE_D_DIR, params) == -1) + return -1; + } else { + poly->init_script = strdup(params); + } + if (poly->init_script == NULL) + return -1; + } + return 0; +} + +static int parse_method(char *method, struct polydir_s *poly, + struct instance_data *idata) +{ + enum polymethod pm; + char *sptr; + static const char *method_names[] = { "user", "context", "level", "tmpdir", + "tmpfs", NULL }; + static const char *flag_names[] = { "create", "noinit", "iscript", + "shared", NULL }; + static const unsigned int flag_values[] = { POLYDIR_CREATE, POLYDIR_NOINIT, + POLYDIR_ISCRIPT, POLYDIR_SHARED }; + int i; + char *flag; + + method = strtok_r(method, ":", &sptr); + pm = NONE; + + for (i = 0; method_names[i]; i++) { + if (strcmp(method, method_names[i]) == 0) { + pm = i + 1; /* 0 = NONE */ + } + } + + if (pm == NONE) { + pam_syslog(idata->pamh, LOG_NOTICE, "Unknown method"); + return -1; + } + + poly->method = pm; + + while ((flag=strtok_r(NULL, ":", &sptr)) != NULL) { + for (i = 0; flag_names[i]; i++) { + int namelen = strlen(flag_names[i]); + + if (strncmp(flag, flag_names[i], namelen) == 0) { + poly->flags |= flag_values[i]; + switch (flag_values[i]) { + case POLYDIR_CREATE: + if (parse_create_params(flag+namelen, poly) != 0) { + pam_syslog(idata->pamh, LOG_CRIT, "Invalid create parameters"); + return -1; + } + break; + + case POLYDIR_ISCRIPT: + if (parse_iscript_params(flag+namelen, poly) != 0) { + pam_syslog(idata->pamh, LOG_CRIT, "Memory allocation error"); + return -1; + }; + break; + } + } + } + } + + return 0; +} + +/* + * Called from parse_config_file, this function processes a single line + * of the namespace configuration file. It skips over comments and incomplete + * or malformed lines. It processes a valid line with information on + * polyinstantiating a directory by populating appropriate fields of a + * polyinstatiated directory structure and then calling add_polydir_entry to + * add that entry to the linked list of polyinstantiated directories. + */ +static int process_line(char *line, const char *home, const char *rhome, + struct instance_data *idata) +{ + char *dir = NULL, *instance_prefix = NULL, *rdir = NULL; + char *method, *uids; + char *tptr; + struct polydir_s *poly; + int retval = 0; + char **config_options = NULL; + static const char *var_names[] = {"HOME", "USER", NULL}; + const char *var_values[] = {home, idata->user}; + const char *rvar_values[] = {rhome, idata->ruser}; + int len; + + poly = calloc(1, sizeof(*poly)); + if (poly == NULL) + goto erralloc; + + /* + * skip the leading white space + */ + while (*line && isspace(*line)) + line++; + + /* + * Rip off the comments + */ + tptr = strchr(line,'#'); + if (tptr) + *tptr = '\0'; + + /* + * Rip off the newline char + */ + tptr = strchr(line,'\n'); + if (tptr) + *tptr = '\0'; + + /* + * Anything left ? + */ + if (line[0] == 0) + return 0; + + /* + * Initialize and scan the five strings from the line from the + * namespace configuration file. + */ + retval = argv_parse(line, NULL, &config_options); + if (retval != 0) { + goto erralloc; + } + + dir = config_options[0]; + if (dir == NULL) { + pam_syslog(idata->pamh, LOG_NOTICE, "Invalid line missing polydir"); + goto skipping; + } + instance_prefix = config_options[1]; + if (instance_prefix == NULL) { + pam_syslog(idata->pamh, LOG_NOTICE, "Invalid line missing instance_prefix"); + instance_prefix = NULL; + goto skipping; + } + method = config_options[2]; + if (method == NULL) { + pam_syslog(idata->pamh, LOG_NOTICE, "Invalid line missing method"); + instance_prefix = NULL; + dir = NULL; + goto skipping; + } + + /* + * Only the uids field is allowed to be blank, to indicate no + * override users for polyinstantiation of that directory. If + * any of the other fields are blank, the line is incomplete so + * skip it. + */ + uids = config_options[3]; + + /* + * Expand $HOME and $USER in poly dir and instance dir prefix + */ + if ((rdir=expand_variables(dir, var_names, rvar_values)) == NULL) { + instance_prefix = NULL; + dir = NULL; + goto erralloc; + } + + if ((dir=expand_variables(dir, var_names, var_values)) == NULL) { + instance_prefix = NULL; + goto erralloc; + } + + if ((instance_prefix=expand_variables(instance_prefix, var_names, var_values)) + == NULL) { + goto erralloc; + } + + if (idata->flags & PAMNS_DEBUG) { + pam_syslog(idata->pamh, LOG_DEBUG, "Expanded polydir: '%s'", dir); + pam_syslog(idata->pamh, LOG_DEBUG, "Expanded ruser polydir: '%s'", rdir); + pam_syslog(idata->pamh, LOG_DEBUG, "Expanded instance prefix: '%s'", instance_prefix); + } + + len = strlen(dir); + if (len > 0 && dir[len-1] == '/') { + dir[len-1] = '\0'; + } + + len = strlen(rdir); + if (len > 0 && rdir[len-1] == '/') { + rdir[len-1] = '\0'; + } + + if (dir[0] == '\0' || rdir[0] == '\0') { + pam_syslog(idata->pamh, LOG_NOTICE, "Invalid polydir"); + goto skipping; + } + + /* + * Populate polyinstantiated directory structure with appropriate + * pathnames and the method with which to polyinstantiate. + */ + if (strlen(dir) >= sizeof(poly->dir) + || strlen(rdir) >= sizeof(poly->rdir) + || strlen(instance_prefix) >= sizeof(poly->instance_prefix)) { + pam_syslog(idata->pamh, LOG_NOTICE, "Pathnames too long"); + goto skipping; + } + strcpy(poly->dir, dir); + strcpy(poly->rdir, rdir); + strcpy(poly->instance_prefix, instance_prefix); + + if (parse_method(method, poly, idata) != 0) { + goto skipping; + } + + if (poly->method == TMPDIR) { + if (sizeof(poly->instance_prefix) - strlen(poly->instance_prefix) < 7) { + pam_syslog(idata->pamh, LOG_NOTICE, "Pathnames too long"); + goto skipping; + } + strcat(poly->instance_prefix, "XXXXXX"); + } + + /* + * Ensure that all pathnames are absolute path names. + */ + if ((poly->dir[0] != '/') || (poly->method != TMPFS && poly->instance_prefix[0] != '/')) { + pam_syslog(idata->pamh, LOG_NOTICE, "Pathnames must start with '/'"); + goto skipping; + } + if (strstr(dir, "..") || strstr(poly->instance_prefix, "..")) { + pam_syslog(idata->pamh, LOG_NOTICE, "Pathnames must not contain '..'"); + goto skipping; + } + + /* + * If the line in namespace.conf for a directory to polyinstantiate + * contains a list of override users (users for whom polyinstantiation + * is not performed), read the user ids, convert names into uids, and + * add to polyinstantiated directory structure. + */ + if (uids) { + uid_t *uidptr; + const char *ustr, *sstr; + int count, i; + + if (*uids == '~') { + poly->flags |= POLYDIR_EXCLUSIVE; + uids++; + } + for (count = 0, ustr = sstr = uids; sstr; ustr = sstr + 1, count++) + sstr = strchr(ustr, ','); + + poly->num_uids = count; + poly->uid = (uid_t *) malloc(count * sizeof (uid_t)); + uidptr = poly->uid; + if (uidptr == NULL) { + goto erralloc; + } + + ustr = uids; + for (i = 0; i < count; i++) { + struct passwd *pwd; + + tptr = strchr(ustr, ','); + if (tptr) + *tptr = '\0'; + + pwd = pam_modutil_getpwnam(idata->pamh, ustr); + if (pwd == NULL) { + pam_syslog(idata->pamh, LOG_ERR, "Unknown user %s in configuration", ustr); + poly->num_uids--; + } else { + *uidptr = pwd->pw_uid; + uidptr++; + } + ustr = tptr + 1; + } + } + + /* + * Add polyinstantiated directory structure to the linked list + * of all polyinstantiated directory structures. + */ + add_polydir_entry(idata, poly); + + goto out; + +erralloc: + pam_syslog(idata->pamh, LOG_CRIT, "Memory allocation error"); + +skipping: + if (idata->flags & PAMNS_IGN_CONFIG_ERR) + retval = 0; + else + retval = PAM_SERVICE_ERR; + del_polydir(poly); +out: + free(rdir); + free(dir); + free(instance_prefix); + argv_free(config_options); + return retval; +} + + +/* + * Parses /etc/security/namespace.conf file to build a linked list of + * polyinstantiated directory structures of type polydir_s. Each entry + * in the linked list contains information needed to polyinstantiate + * one directory. + */ +static int parse_config_file(struct instance_data *idata) +{ + FILE *fil; + char *home, *rhome; + const char *confname; + struct passwd *cpwd; + char *line; + int retval; + size_t len = 0; + glob_t globbuf; + const char *oldlocale; + size_t n; + + /* + * Extract the user's home directory to resolve $HOME entries + * in the namespace configuration file. + */ + cpwd = pam_modutil_getpwnam(idata->pamh, idata->user); + if (!cpwd) { + pam_syslog(idata->pamh, LOG_ERR, + "Error getting home dir for '%s'", idata->user); + return PAM_SESSION_ERR; + } + if ((home=strdup(cpwd->pw_dir)) == NULL) { + pam_syslog(idata->pamh, LOG_CRIT, + "Memory allocation error"); + return PAM_SESSION_ERR; + } + + cpwd = pam_modutil_getpwnam(idata->pamh, idata->ruser); + if (!cpwd) { + pam_syslog(idata->pamh, LOG_ERR, + "Error getting home dir for '%s'", idata->ruser); + free(home); + return PAM_SESSION_ERR; + } + + if ((rhome=strdup(cpwd->pw_dir)) == NULL) { + pam_syslog(idata->pamh, LOG_CRIT, + "Memory allocation error"); + free(home); + return PAM_SESSION_ERR; + } + + /* + * Open configuration file, read one line at a time and call + * process_line to process each line. + */ + + memset(&globbuf, '\0', sizeof(globbuf)); + oldlocale = setlocale(LC_COLLATE, "C"); + glob(NAMESPACE_D_GLOB, 0, NULL, &globbuf); + if (oldlocale != NULL) + setlocale(LC_COLLATE, oldlocale); + + confname = PAM_NAMESPACE_CONFIG; + n = 0; + for (;;) { + if (idata->flags & PAMNS_DEBUG) + pam_syslog(idata->pamh, LOG_DEBUG, "Parsing config file %s", + confname); + fil = fopen(confname, "r"); + if (fil == NULL) { + pam_syslog(idata->pamh, LOG_ERR, "Error opening config file %s", + confname); + globfree(&globbuf); + free(rhome); + free(home); + return PAM_SERVICE_ERR; + } + + /* Use unlocked IO */ + __fsetlocking(fil, FSETLOCKING_BYCALLER); + + line = NULL; + /* loop reading the file */ + while (getline(&line, &len, fil) > 0) { + retval = process_line(line, home, rhome, idata); + if (retval) { + pam_syslog(idata->pamh, LOG_ERR, + "Error processing conf file %s line %s", confname, line); + fclose(fil); + free(line); + globfree(&globbuf); + free(rhome); + free(home); + return PAM_SERVICE_ERR; + } + } + fclose(fil); + free(line); + + if (n >= globbuf.gl_pathc) + break; + + confname = globbuf.gl_pathv[n]; + n++; + } + + globfree(&globbuf); + free(rhome); + free(home); + + /* All done...just some debug stuff */ + if (idata->flags & PAMNS_DEBUG) { + struct polydir_s *dptr = idata->polydirs_ptr; + uid_t *iptr; + uid_t i; + + pam_syslog(idata->pamh, LOG_DEBUG, + dptr?"Configured poly dirs:":"No configured poly dirs"); + while (dptr) { + pam_syslog(idata->pamh, LOG_DEBUG, "dir='%s' iprefix='%s' meth=%d", + dptr->dir, dptr->instance_prefix, dptr->method); + for (i = 0, iptr = dptr->uid; i < dptr->num_uids; i++, iptr++) + pam_syslog(idata->pamh, LOG_DEBUG, "override user %d ", *iptr); + dptr = dptr->next; + } + } + + return PAM_SUCCESS; +} + + +/* + * This funtion returns true if a given uid is present in the polyinstantiated + * directory's list of override uids. If the uid is one of the override + * uids for the polyinstantiated directory, polyinstantiation is not + * performed for that user for that directory. + * If exclusive is set the returned values are opposite. + */ +static int ns_override(struct polydir_s *polyptr, struct instance_data *idata, + uid_t uid) +{ + unsigned int i; + + if (idata->flags & PAMNS_DEBUG) + pam_syslog(idata->pamh, LOG_DEBUG, + "Checking for ns override in dir %s for uid %d", + polyptr->dir, uid); + + for (i = 0; i < polyptr->num_uids; i++) { + if (uid == polyptr->uid[i]) { + return !(polyptr->flags & POLYDIR_EXCLUSIVE); + } + } + + return !!(polyptr->flags & POLYDIR_EXCLUSIVE); +} + +/* + * md5hash generates a hash of the passed in instance directory name. + */ +static char *md5hash(const char *instname, struct instance_data *idata) +{ + int i; + char *md5inst = NULL; + char *to; + unsigned char inst_digest[MD5_DIGEST_LENGTH]; + + /* + * Create MD5 hashes for instance pathname. + */ + + MD5((const unsigned char *)instname, strlen(instname), inst_digest); + + if ((md5inst = malloc(MD5_DIGEST_LENGTH * 2 + 1)) == NULL) { + pam_syslog(idata->pamh, LOG_ERR, "Unable to allocate buffer"); + return NULL; + } + + to = md5inst; + for (i = 0; i < MD5_DIGEST_LENGTH; i++) { + snprintf(to, 3, "%02x", (unsigned int)inst_digest[i]); + to += 2; + } + + return md5inst; +} + +#ifdef WITH_SELINUX +static int form_context(const struct polydir_s *polyptr, + security_context_t *i_context, security_context_t *origcon, + struct instance_data *idata) +{ + int rc = PAM_SUCCESS; + security_context_t scon = NULL; + security_class_t tclass; + + /* + * Get the security context of the directory to polyinstantiate. + */ + rc = getfilecon(polyptr->dir, origcon); + if (rc < 0 || *origcon == NULL) { + pam_syslog(idata->pamh, LOG_ERR, + "Error getting poly dir context, %m"); + return PAM_SESSION_ERR; + } + + if (polyptr->method == USER) return PAM_SUCCESS; + + if (idata->flags & PAMNS_USE_CURRENT_CONTEXT) { + rc = getcon(&scon); + } else if (idata->flags & PAMNS_USE_DEFAULT_CONTEXT) { + char *seuser = NULL, *level = NULL; + + if ((rc=getseuserbyname(idata->user, &seuser, &level)) == 0) { + rc = get_default_context_with_level(seuser, level, NULL, &scon); + free(seuser); + free(level); + } + } else { + rc = getexeccon(&scon); + } + if (rc < 0 || scon == NULL) { + pam_syslog(idata->pamh, LOG_ERR, + "Error getting exec context, %m"); + return PAM_SESSION_ERR; + } + + /* + * If polyinstantiating based on security context, get current + * process security context, get security class for directories, + * and ask the policy to provide security context of the + * polyinstantiated instance directory. + */ + + if (polyptr->method == CONTEXT) { + tclass = string_to_security_class("dir"); + + if (security_compute_member(scon, *origcon, tclass, + i_context) < 0) { + pam_syslog(idata->pamh, LOG_ERR, + "Error computing poly dir member context"); + freecon(scon); + return PAM_SESSION_ERR; + } else if (idata->flags & PAMNS_DEBUG) + pam_syslog(idata->pamh, LOG_DEBUG, + "member context returned by policy %s", *i_context); + freecon(scon); + return PAM_SUCCESS; + } + + /* + * If polyinstantiating based on security level, get current + * process security context, get security class for directories, + * and change the directories MLS Level to match process. + */ + + if (polyptr->method == LEVEL) { + context_t scontext = NULL; + context_t fcontext = NULL; + rc = PAM_SESSION_ERR; + + scontext = context_new(scon); + if (! scontext) { + pam_syslog(idata->pamh, LOG_ERR, "out of memory"); + goto fail; + } + fcontext = context_new(*origcon); + if (! fcontext) { + pam_syslog(idata->pamh, LOG_ERR, "out of memory"); + goto fail; + } + if (context_range_set(fcontext, context_range_get(scontext)) != 0) { + pam_syslog(idata->pamh, LOG_ERR, "Unable to set MLS Componant of context"); + goto fail; + } + *i_context=strdup(context_str(fcontext)); + if (! *i_context) { + pam_syslog(idata->pamh, LOG_ERR, "out of memory"); + goto fail; + } + + rc = PAM_SUCCESS; + fail: + context_free(scontext); + context_free(fcontext); + freecon(scon); + return rc; + } + /* Should never get here */ + return PAM_SUCCESS; +} +#endif + +/* + * poly_name returns the name of the polyinstantiated instance directory + * based on the method used for polyinstantiation (user, context or level) + * In addition, the function also returns the security contexts of the + * original directory to polyinstantiate and the polyinstantiated instance + * directory. + */ +#ifdef WITH_SELINUX +static int poly_name(const struct polydir_s *polyptr, char **i_name, + security_context_t *i_context, security_context_t *origcon, + struct instance_data *idata) +#else +static int poly_name(const struct polydir_s *polyptr, char **i_name, + struct instance_data *idata) +#endif +{ + int rc; + char *hash = NULL; + enum polymethod pm; +#ifdef WITH_SELINUX + security_context_t rawcon = NULL; +#endif + + *i_name = NULL; +#ifdef WITH_SELINUX + *i_context = NULL; + *origcon = NULL; + if ((idata->flags & PAMNS_SELINUX_ENABLED) && + (rc=form_context(polyptr, i_context, origcon, idata)) != PAM_SUCCESS) { + return rc; + } +#endif + + rc = PAM_SESSION_ERR; + /* + * Set the name of the polyinstantiated instance dir based on the + * polyinstantiation method. + */ + + pm = polyptr->method; + if (pm == LEVEL || pm == CONTEXT) +#ifdef WITH_SELINUX + if (!(idata->flags & PAMNS_CTXT_BASED_INST)) { +#else + { + pam_syslog(idata->pamh, LOG_NOTICE, + "Context and level methods not available, using user method"); +#endif + if (polyptr->flags & POLYDIR_SHARED) { + rc = PAM_IGNORE; + goto fail; + } + pm = USER; + } + + switch (pm) { + case USER: + if (asprintf(i_name, "%s", idata->user) < 0) { + *i_name = NULL; + goto fail; + } + break; + +#ifdef WITH_SELINUX + case LEVEL: + case CONTEXT: + if (selinux_trans_to_raw_context(*i_context, &rawcon) < 0) { + pam_syslog(idata->pamh, LOG_ERR, "Error translating directory context"); + goto fail; + } + if (polyptr->flags & POLYDIR_SHARED) { + if (asprintf(i_name, "%s", rawcon) < 0) { + *i_name = NULL; + goto fail; + } + } else { + if (asprintf(i_name, "%s_%s", rawcon, idata->user) < 0) { + *i_name = NULL; + goto fail; + } + } + break; + +#endif /* WITH_SELINUX */ + + case TMPDIR: + case TMPFS: + if ((*i_name=strdup("")) == NULL) + goto fail; + return PAM_SUCCESS; + + default: + if (idata->flags & PAMNS_DEBUG) + pam_syslog(idata->pamh, LOG_ERR, "Unknown method"); + goto fail; + } + + if (idata->flags & PAMNS_DEBUG) + pam_syslog(idata->pamh, LOG_DEBUG, "poly_name %s", *i_name); + + if ((idata->flags & PAMNS_GEN_HASH) || strlen(*i_name) > NAMESPACE_MAX_DIR_LEN) { + hash = md5hash(*i_name, idata); + if (hash == NULL) { + goto fail; + } + if (idata->flags & PAMNS_GEN_HASH) { + free(*i_name); + *i_name = hash; + hash = NULL; + } else { + char *newname; + if (asprintf(&newname, "%.*s_%s", NAMESPACE_MAX_DIR_LEN-1-(int)strlen(hash), + *i_name, hash) < 0) { + goto fail; + } + free(*i_name); + *i_name = newname; + } + } + rc = PAM_SUCCESS; + +fail: + free(hash); +#ifdef WITH_SELINUX + freecon(rawcon); +#endif + if (rc != PAM_SUCCESS) { +#ifdef WITH_SELINUX + freecon(*i_context); + *i_context = NULL; + freecon(*origcon); + *origcon = NULL; +#endif + free(*i_name); + *i_name = NULL; + } + return rc; +} + +static int check_inst_parent(char *ipath, struct instance_data *idata) +{ + struct stat instpbuf; + char *inst_parent, *trailing_slash; + /* + * stat the instance parent path to make sure it exists + * and is a directory. Check that its mode is 000 (unless the + * admin explicitly instructs to ignore the instance parent + * mode by the "ignore_instance_parent_mode" argument). + */ + inst_parent = (char *) malloc(strlen(ipath)+1); + if (!inst_parent) { + pam_syslog(idata->pamh, LOG_ERR, "Error allocating pathname string"); + return PAM_SESSION_ERR; + } + + strcpy(inst_parent, ipath); + trailing_slash = strrchr(inst_parent, '/'); + if (trailing_slash) + *trailing_slash = '\0'; + + if (stat(inst_parent, &instpbuf) < 0) { + pam_syslog(idata->pamh, LOG_ERR, "Error stating %s, %m", inst_parent); + free(inst_parent); + return PAM_SESSION_ERR; + } + + /* + * Make sure we are dealing with a directory + */ + if (!S_ISDIR(instpbuf.st_mode)) { + pam_syslog(idata->pamh, LOG_ERR, "Instance parent %s is not a dir", + inst_parent); + free(inst_parent); + return PAM_SESSION_ERR; + } + + if ((idata->flags & PAMNS_IGN_INST_PARENT_MODE) == 0) { + if (instpbuf.st_mode & (S_IRWXU|S_IRWXG|S_IRWXO)) { + pam_syslog(idata->pamh, LOG_ERR, "Mode of inst parent %s not 000", + inst_parent); + free(inst_parent); + return PAM_SESSION_ERR; + } + } + free(inst_parent); + return PAM_SUCCESS; +} + +/* +* Check to see if there is a namespace initialization script in +* the /etc/security directory. If such a script exists +* execute it and pass directory to polyinstantiate and instance +* directory as arguments. +*/ +static int inst_init(const struct polydir_s *polyptr, const char *ipath, + struct instance_data *idata, int newdir) +{ + pid_t rc, pid; + sighandler_t osighand = NULL; + int status; + const char *init_script = NAMESPACE_INIT_SCRIPT; + + osighand = signal(SIGCHLD, SIG_DFL); + if (osighand == SIG_ERR) { + pam_syslog(idata->pamh, LOG_ERR, "Cannot set signal value"); + rc = PAM_SESSION_ERR; + goto out; + } + + if ((polyptr->flags & POLYDIR_ISCRIPT) && polyptr->init_script) + init_script = polyptr->init_script; + + if (access(init_script, F_OK) == 0) { + if (access(init_script, X_OK) < 0) { + if (idata->flags & PAMNS_DEBUG) + pam_syslog(idata->pamh, LOG_ERR, + "Namespace init script not executable"); + rc = PAM_SESSION_ERR; + goto out; + } else { + pid = fork(); + if (pid == 0) { +#ifdef WITH_SELINUX + if (idata->flags & PAMNS_SELINUX_ENABLED) { + if (setexeccon(NULL) < 0) + exit(1); + } +#endif + if (execl(init_script, init_script, + polyptr->dir, ipath, newdir?"1":"0", idata->user, (char *)NULL) < 0) + exit(1); + } else if (pid > 0) { + while (((rc = waitpid(pid, &status, 0)) == (pid_t)-1) && + (errno == EINTR)); + if (rc == (pid_t)-1) { + pam_syslog(idata->pamh, LOG_ERR, "waitpid failed- %m"); + rc = PAM_SESSION_ERR; + goto out; + } + if (!WIFEXITED(status) || WIFSIGNALED(status) > 0) { + pam_syslog(idata->pamh, LOG_ERR, + "Error initializing instance"); + rc = PAM_SESSION_ERR; + goto out; + } + } else if (pid < 0) { + pam_syslog(idata->pamh, LOG_ERR, + "Cannot fork to run namespace init script, %m"); + rc = PAM_SESSION_ERR; + goto out; + } + } + } + rc = PAM_SUCCESS; +out: + (void) signal(SIGCHLD, osighand); + + return rc; +} + +static int create_polydir(struct polydir_s *polyptr, + struct instance_data *idata) +{ + mode_t mode; + int rc; +#ifdef WITH_SELINUX + security_context_t dircon, oldcon = NULL; +#endif + const char *dir = polyptr->dir; + + if (polyptr->mode != (mode_t)ULONG_MAX) + mode = polyptr->mode; + else + mode = 0777; + +#ifdef WITH_SELINUX + if (idata->flags & PAMNS_SELINUX_ENABLED) { + getfscreatecon(&oldcon); + rc = matchpathcon(dir, S_IFDIR, &dircon); + if (rc) { + pam_syslog(idata->pamh, LOG_NOTICE, + "Unable to get default context for directory %s, check your policy: %m", dir); + } else { + if (idata->flags & PAMNS_DEBUG) + pam_syslog(idata->pamh, LOG_DEBUG, + "Polydir %s context: %s", dir, (char *)dircon); + if (setfscreatecon(dircon) != 0) + pam_syslog(idata->pamh, LOG_NOTICE, + "Error setting context for directory %s: %m", dir); + freecon(dircon); + } + matchpathcon_fini(); + } +#endif + + rc = mkdir(dir, mode); + if (rc != 0) { + pam_syslog(idata->pamh, LOG_ERR, + "Error creating directory %s: %m", dir); + return PAM_SESSION_ERR; + } + +#ifdef WITH_SELINUX + if (idata->flags & PAMNS_SELINUX_ENABLED) { + if (setfscreatecon(oldcon) != 0) + pam_syslog(idata->pamh, LOG_NOTICE, + "Error resetting fs create context: %m"); + freecon(oldcon); + } +#endif + + if (idata->flags & PAMNS_DEBUG) + pam_syslog(idata->pamh, LOG_DEBUG, "Created polydir %s", dir); + + if (polyptr->mode != (mode_t)ULONG_MAX) { + /* explicit mode requested */ + if (chmod(dir, mode) != 0) { + pam_syslog(idata->pamh, LOG_ERR, + "Error changing mode of directory %s: %m", dir); + rmdir(dir); + return PAM_SESSION_ERR; + } + } + + if (polyptr->owner != (uid_t)ULONG_MAX) { + if (chown(dir, polyptr->owner, polyptr->group) != 0) { + pam_syslog(idata->pamh, LOG_ERR, + "Unable to change owner on directory %s: %m", dir); + rmdir(dir); + return PAM_SESSION_ERR; + } + if (idata->flags & PAMNS_DEBUG) + pam_syslog(idata->pamh, LOG_DEBUG, + "Polydir owner %u group %u from configuration", polyptr->owner, polyptr->group); + } else { + if (chown(dir, idata->uid, idata->gid) != 0) { + pam_syslog(idata->pamh, LOG_ERR, + "Unable to change owner on directory %s: %m", dir); + rmdir(dir); + return PAM_SESSION_ERR; + } + if (idata->flags & PAMNS_DEBUG) + pam_syslog(idata->pamh, LOG_DEBUG, + "Polydir owner %u group %u", idata->uid, idata->gid); + } + + return PAM_SUCCESS; +} + +/* + * Create polyinstantiated instance directory (ipath). + */ +#ifdef WITH_SELINUX +static int create_dirs(struct polydir_s *polyptr, char *ipath, struct stat *statbuf, + security_context_t icontext, security_context_t ocontext, + struct instance_data *idata) +#else +static int create_dirs(struct polydir_s *polyptr, char *ipath, struct stat *statbuf, + struct instance_data *idata) +#endif +{ + struct stat newstatbuf; + int fd; + int newdir = 0; + + /* + * Check to make sure instance parent is valid. + */ + if (check_inst_parent(ipath, idata)) + return PAM_SESSION_ERR; + + /* + * Create instance directory and set its security context to the context + * returned by the security policy. Set its mode and ownership + * attributes to match that of the original directory that is being + * polyinstantiated. + */ + + if (polyptr->method == TMPDIR) { + if (mkdtemp(polyptr->instance_prefix) == NULL) { + pam_syslog(idata->pamh, LOG_ERR, "Error creating temporary instance %s, %m", + polyptr->instance_prefix); + polyptr->method = NONE; /* do not clean up! */ + return PAM_SESSION_ERR; + } + /* copy the actual directory name to ipath */ + strcpy(ipath, polyptr->instance_prefix); + } else if (mkdir(ipath, S_IRUSR) < 0) { + if (errno == EEXIST) + goto inst_init; + else { + pam_syslog(idata->pamh, LOG_ERR, "Error creating %s, %m", + ipath); + return PAM_SESSION_ERR; + } + } + + newdir = 1; + /* Open a descriptor to it to prevent races */ + fd = open(ipath, O_DIRECTORY | O_RDONLY); + if (fd < 0) { + pam_syslog(idata->pamh, LOG_ERR, "Error opening %s, %m", ipath); + rmdir(ipath); + return PAM_SESSION_ERR; + } +#ifdef WITH_SELINUX + /* If SE Linux is disabled, no need to label it */ + if (idata->flags & PAMNS_SELINUX_ENABLED) { + /* If method is USER, icontext is NULL */ + if (icontext) { + if (fsetfilecon(fd, icontext) < 0) { + pam_syslog(idata->pamh, LOG_ERR, + "Error setting context of %s to %s", ipath, icontext); + close(fd); + rmdir(ipath); + return PAM_SESSION_ERR; + } + } else { + if (fsetfilecon(fd, ocontext) < 0) { + pam_syslog(idata->pamh, LOG_ERR, + "Error setting context of %s to %s", ipath, ocontext); + close(fd); + rmdir(ipath); + return PAM_SESSION_ERR; + } + } + } +#endif + if (fstat(fd, &newstatbuf) < 0) { + pam_syslog(idata->pamh, LOG_ERR, "Error stating %s, %m", + ipath); + rmdir(ipath); + return PAM_SESSION_ERR; + } + if (newstatbuf.st_uid != statbuf->st_uid || + newstatbuf.st_gid != statbuf->st_gid) { + if (fchown(fd, statbuf->st_uid, statbuf->st_gid) < 0) { + pam_syslog(idata->pamh, LOG_ERR, + "Error changing owner for %s, %m", + ipath); + close(fd); + rmdir(ipath); + return PAM_SESSION_ERR; + } + } + if (fchmod(fd, statbuf->st_mode & 07777) < 0) { + pam_syslog(idata->pamh, LOG_ERR, "Error changing mode for %s, %m", + ipath); + close(fd); + rmdir(ipath); + return PAM_SESSION_ERR; + } + close(fd); + + /* + * Check to see if there is a namespace initialization script in + * the /etc/security directory. If such a script exists + * execute it and pass directory to polyinstantiate and instance + * directory as arguments. + */ + +inst_init: + if (polyptr->flags & POLYDIR_NOINIT) + return PAM_SUCCESS; + + return inst_init(polyptr, ipath, idata, newdir); +} + + +/* + * This function performs the namespace setup for a particular directory + * that is being polyinstantiated. It creates an MD5 hash of instance + * directory, calls create_dirs to create it with appropriate + * security attributes, and performs bind mount to setup the process + * namespace. + */ +static int ns_setup(struct polydir_s *polyptr, + struct instance_data *idata) +{ + int retval = 0; + char *inst_dir = NULL; + char *instname = NULL; + struct stat statbuf; +#ifdef WITH_SELINUX + security_context_t instcontext = NULL, origcontext = NULL; +#endif + + if (idata->flags & PAMNS_DEBUG) + pam_syslog(idata->pamh, LOG_DEBUG, + "Set namespace for directory %s", polyptr->dir); + + while (stat(polyptr->dir, &statbuf) < 0) { + if (retval || !(polyptr->flags & POLYDIR_CREATE)) { + pam_syslog(idata->pamh, LOG_ERR, "Error stating %s, %m", + polyptr->dir); + return PAM_SESSION_ERR; + } else { + if (create_polydir(polyptr, idata) != PAM_SUCCESS) + return PAM_SESSION_ERR; + retval = PAM_SESSION_ERR; /* bail out on next failed stat */ + } + } + + /* + * Make sure we are dealing with a directory + */ + if (!S_ISDIR(statbuf.st_mode)) { + pam_syslog(idata->pamh, LOG_ERR, "Polydir %s is not a dir", + polyptr->dir); + return PAM_SESSION_ERR; + } + + if (polyptr->method == TMPFS) { + if (mount("tmpfs", polyptr->dir, "tmpfs", 0, NULL) < 0) { + pam_syslog(idata->pamh, LOG_ERR, "Error mounting tmpfs on %s, %m", + polyptr->dir); + return PAM_SESSION_ERR; + } + /* we must call inst_init after the mount in this case */ + return inst_init(polyptr, "tmpfs", idata, 1); + } + + /* + * Obtain the name of instance pathname based on the + * polyinstantiation method and instance context returned by + * security policy. + */ +#ifdef WITH_SELINUX + retval = poly_name(polyptr, &instname, &instcontext, + &origcontext, idata); +#else + retval = poly_name(polyptr, &instname, idata); +#endif + + if (retval != PAM_SUCCESS) { + if (retval != PAM_IGNORE) + pam_syslog(idata->pamh, LOG_ERR, "Error getting instance name"); + goto cleanup; + } else { +#ifdef WITH_SELINUX + if ((idata->flags & PAMNS_DEBUG) && + (idata->flags & PAMNS_SELINUX_ENABLED)) + pam_syslog(idata->pamh, LOG_DEBUG, "Inst ctxt %s Orig ctxt %s", + instcontext, origcontext); +#endif + } + + if (asprintf(&inst_dir, "%s%s", polyptr->instance_prefix, instname) < 0) + goto error_out; + + if (idata->flags & PAMNS_DEBUG) + pam_syslog(idata->pamh, LOG_DEBUG, "instance_dir %s", + inst_dir); + + /* + * Create instance directory with appropriate security + * contexts, owner, group and mode bits. + */ +#ifdef WITH_SELINUX + retval = create_dirs(polyptr, inst_dir, &statbuf, instcontext, + origcontext, idata); +#else + retval = create_dirs(polyptr, inst_dir, &statbuf, idata); +#endif + + if (retval < 0) { + pam_syslog(idata->pamh, LOG_ERR, "Error creating instance dir"); + goto error_out; + } + + /* + * Bind mount instance directory on top of the polyinstantiated + * directory to provide an instance of polyinstantiated directory + * based on polyinstantiated method. + */ + if (mount(inst_dir, polyptr->dir, NULL, MS_BIND, NULL) < 0) { + pam_syslog(idata->pamh, LOG_ERR, "Error mounting %s on %s, %m", + inst_dir, polyptr->dir); + goto error_out; + } + + goto cleanup; + + /* + * various error exit points. Free allocated memory and set return + * value to indicate a pam session error. + */ +error_out: + retval = PAM_SESSION_ERR; + +cleanup: + free(inst_dir); + free(instname); +#ifdef WITH_SELINUX + freecon(instcontext); + freecon(origcontext); +#endif + return retval; +} + + +/* + * This function checks to see if the current working directory is + * inside the directory passed in as the first argument. + */ +static int cwd_in(char *dir, struct instance_data *idata) +{ + int retval = 0; + char cwd[PATH_MAX]; + + if (getcwd(cwd, PATH_MAX) == NULL) { + pam_syslog(idata->pamh, LOG_ERR, "Can't get current dir, %m"); + return -1; + } + + if (strncmp(cwd, dir, strlen(dir)) == 0) { + if (idata->flags & PAMNS_DEBUG) + pam_syslog(idata->pamh, LOG_DEBUG, "cwd is inside %s", dir); + retval = 1; + } else { + if (idata->flags & PAMNS_DEBUG) + pam_syslog(idata->pamh, LOG_DEBUG, "cwd is outside %s", dir); + } + + return retval; +} + +static int cleanup_tmpdirs(struct instance_data *idata) +{ + struct polydir_s *pptr; + pid_t rc, pid; + sighandler_t osighand = NULL; + int status; + + osighand = signal(SIGCHLD, SIG_DFL); + if (osighand == SIG_ERR) { + pam_syslog(idata->pamh, LOG_ERR, "Cannot set signal value"); + rc = PAM_SESSION_ERR; + goto out; + } + + for (pptr = idata->polydirs_ptr; pptr; pptr = pptr->next) { + if (pptr->method == TMPDIR && access(pptr->instance_prefix, F_OK) == 0) { + pid = fork(); + if (pid == 0) { +#ifdef WITH_SELINUX + if (idata->flags & PAMNS_SELINUX_ENABLED) { + if (setexeccon(NULL) < 0) + exit(1); + } +#endif + if (execl("/bin/rm", "/bin/rm", "-rf", pptr->instance_prefix, (char *)NULL) < 0) + exit(1); + } else if (pid > 0) { + while (((rc = waitpid(pid, &status, 0)) == (pid_t)-1) && + (errno == EINTR)); + if (rc == (pid_t)-1) { + pam_syslog(idata->pamh, LOG_ERR, "waitpid failed- %m"); + rc = PAM_SESSION_ERR; + goto out; + } + if (!WIFEXITED(status) || WIFSIGNALED(status) > 0) { + pam_syslog(idata->pamh, LOG_ERR, + "Error removing %s", pptr->instance_prefix); + } + } else if (pid < 0) { + pam_syslog(idata->pamh, LOG_ERR, + "Cannot fork to run namespace init script, %m"); + rc = PAM_SESSION_ERR; + goto out; + } + } + } + + rc = PAM_SUCCESS; +out: + signal(SIGCHLD, osighand); + return rc; +} + +/* + * This function checks to see if polyinstantiation is needed for any + * of the directories listed in the configuration file. If needed, + * cycles through all polyinstantiated directory entries and calls + * ns_setup to setup polyinstantiation for each one of them. + */ +static int setup_namespace(struct instance_data *idata, enum unmnt_op unmnt) +{ + int retval = 0, need_poly = 0, changing_dir = 0; + char *cptr, *fptr, poly_parent[PATH_MAX]; + struct polydir_s *pptr; + + if (idata->flags & PAMNS_DEBUG) + pam_syslog(idata->pamh, LOG_DEBUG, "Set up namespace for pid %d", + getpid()); + + /* + * Cycle through all polyinstantiated directory entries to see if + * polyinstantiation is needed at all. + */ + for (pptr = idata->polydirs_ptr; pptr; pptr = pptr->next) { + if (ns_override(pptr, idata, idata->uid)) { + if (unmnt == NO_UNMNT || ns_override(pptr, idata, idata->ruid)) { + if (idata->flags & PAMNS_DEBUG) + pam_syslog(idata->pamh, LOG_DEBUG, + "Overriding poly for user %d for dir %s", + idata->uid, pptr->dir); + } else { + if (idata->flags & PAMNS_DEBUG) + pam_syslog(idata->pamh, LOG_DEBUG, + "Need unmount ns for user %d for dir %s", + idata->ruid, pptr->dir); + need_poly = 1; + break; + } + continue; + } else { + if (idata->flags & PAMNS_DEBUG) + pam_syslog(idata->pamh, LOG_DEBUG, + "Need poly ns for user %d for dir %s", + idata->uid, pptr->dir); + need_poly = 1; + break; + } + } + + /* + * If polyinstantiation is needed, call the unshare system call to + * disassociate from the parent namespace. + */ + if (need_poly) { + if (unshare(CLONE_NEWNS) < 0) { + pam_syslog(idata->pamh, LOG_ERR, + "Unable to unshare from parent namespace, %m"); + return PAM_SESSION_ERR; + } + } else { + del_polydir_list(idata->polydirs_ptr); + return PAM_SUCCESS; + } + + /* + * Again cycle through all polyinstantiated directories, this time, + * call ns_setup to setup polyinstantiation for a particular entry. + */ + for (pptr = idata->polydirs_ptr; pptr; pptr = pptr->next) { + enum unmnt_op dir_unmnt = unmnt; + + if (ns_override(pptr, idata, idata->ruid)) { + dir_unmnt = NO_UNMNT; + } + if (ns_override(pptr, idata, idata->uid)) { + if (dir_unmnt == NO_UNMNT) { + continue; + } else { + dir_unmnt = UNMNT_ONLY; + } + } + + if (idata->flags & PAMNS_DEBUG) + pam_syslog(idata->pamh, LOG_DEBUG, + "Setting poly ns for user %d for dir %s", + idata->uid, pptr->dir); + + if ((dir_unmnt == UNMNT_REMNT) || (dir_unmnt == UNMNT_ONLY)) { + /* + * Check to see if process current directory is in the + * bind mounted instance_parent directory that we are trying to + * umount + */ + if ((changing_dir = cwd_in(pptr->rdir, idata)) < 0) { + retval = PAM_SESSION_ERR; + goto out; + } else if (changing_dir) { + if (idata->flags & PAMNS_DEBUG) + pam_syslog(idata->pamh, LOG_DEBUG, "changing cwd"); + + /* + * Change current working directory to the parent of + * the mount point, that is parent of the orig + * directory where original contents of the polydir + * are available from + */ + strcpy(poly_parent, pptr->rdir); + fptr = strchr(poly_parent, '/'); + cptr = strrchr(poly_parent, '/'); + if (fptr && cptr && (fptr == cptr)) + strcpy(poly_parent, "/"); + else if (cptr) + *cptr = '\0'; + if (chdir(poly_parent) < 0) { + pam_syslog(idata->pamh, LOG_ERR, + "Can't chdir to %s, %m", poly_parent); + } + } + + if (umount(pptr->rdir) < 0) { + int saved_errno = errno; + pam_syslog(idata->pamh, LOG_ERR, "Unmount of %s failed, %m", + pptr->rdir); + if (saved_errno != EINVAL) { + retval = PAM_SESSION_ERR; + goto out; + } + } else if (idata->flags & PAMNS_DEBUG) + pam_syslog(idata->pamh, LOG_DEBUG, "Umount succeeded %s", + pptr->rdir); + } + + if (dir_unmnt != UNMNT_ONLY) { + retval = ns_setup(pptr, idata); + if (retval == PAM_IGNORE) + retval = PAM_SUCCESS; + if (retval != PAM_SUCCESS) + break; + } + } +out: + if (retval != PAM_SUCCESS) + cleanup_tmpdirs(idata); + else if (pam_set_data(idata->pamh, NAMESPACE_POLYDIR_DATA, idata->polydirs_ptr, + cleanup_data) != PAM_SUCCESS) { + pam_syslog(idata->pamh, LOG_ERR, "Unable to set namespace data"); + cleanup_tmpdirs(idata); + return PAM_SYSTEM_ERR; + } + return retval; +} + + +/* + * Orig namespace. This function is called from when closing a pam + * session. If authorized, it unmounts instance directory. + */ +static int orig_namespace(struct instance_data *idata) +{ + struct polydir_s *pptr; + + if (idata->flags & PAMNS_DEBUG) + pam_syslog(idata->pamh, LOG_DEBUG, "orig namespace for pid %d", + getpid()); + + /* + * Cycle through all polyinstantiated directories from the namespace + * configuration file to see if polyinstantiation was performed for + * this user for each of the entry. If it was, try and unmount + * appropriate polyinstantiated instance directories. + */ + for (pptr = idata->polydirs_ptr; pptr; pptr = pptr->next) { + if (ns_override(pptr, idata, idata->uid)) + continue; + else { + if (idata->flags & PAMNS_DEBUG) + pam_syslog(idata->pamh, LOG_DEBUG, + "Unmounting instance dir for user %d & dir %s", + idata->uid, pptr->dir); + + if (umount(pptr->dir) < 0) { + pam_syslog(idata->pamh, LOG_ERR, "Unmount of %s failed, %m", + pptr->dir); + return PAM_SESSION_ERR; + } else if (idata->flags & PAMNS_DEBUG) + pam_syslog(idata->pamh, LOG_DEBUG, "Unmount of %s succeeded", + pptr->dir); + } + } + + cleanup_tmpdirs(idata); + return 0; +} + + +#ifdef WITH_SELINUX +/* + * This function checks if the calling program has requested context + * change by calling setexeccon(). If context change is not requested + * then it does not make sense to polyinstantiate based on context. + * The return value from this function is used when selecting the + * polyinstantiation method. If context change is not requested then + * the polyinstantiation method is set to USER, even if the configuration + * file lists the method as "context" or "level". + */ +static int ctxt_based_inst_needed(void) +{ + security_context_t scon = NULL; + int rc = 0; + + rc = getexeccon(&scon); + if (rc < 0 || scon == NULL) + return 0; + else { + freecon(scon); + return 1; + } +} +#endif + + +static int get_user_data(struct instance_data *idata) +{ + int retval; + char *user_name; + struct passwd *pwd; + /* + * Lookup user and fill struct items + */ + retval = pam_get_item(idata->pamh, PAM_USER, (void*) &user_name ); + if ( user_name == NULL || retval != PAM_SUCCESS ) { + pam_syslog(idata->pamh, LOG_ERR, "Error recovering pam user name"); + return PAM_SESSION_ERR; + } + + pwd = pam_modutil_getpwnam(idata->pamh, user_name); + if (!pwd) { + pam_syslog(idata->pamh, LOG_ERR, "user unknown '%s'", user_name); + return PAM_USER_UNKNOWN; + } + + /* + * Add the user info to the instance data so we can refer to them later. + */ + idata->user[0] = 0; + strncat(idata->user, user_name, sizeof(idata->user) - 1); + idata->uid = pwd->pw_uid; + idata->gid = pwd->pw_gid; + + /* Fill in RUSER too */ + retval = pam_get_item(idata->pamh, PAM_RUSER, (void*) &user_name ); + if ( user_name != NULL && retval == PAM_SUCCESS && user_name[0] != '\0' ) { + strncat(idata->ruser, user_name, sizeof(idata->ruser) - 1); + pwd = pam_modutil_getpwnam(idata->pamh, user_name); + } else { + pwd = pam_modutil_getpwuid(idata->pamh, getuid()); + } + if (!pwd) { + pam_syslog(idata->pamh, LOG_ERR, "user unknown '%s'", user_name); + return PAM_USER_UNKNOWN; + } + user_name = pwd->pw_name; + + idata->ruser[0] = 0; + strncat(idata->ruser, user_name, sizeof(idata->ruser) - 1); + idata->ruid = pwd->pw_uid; + + return PAM_SUCCESS; +} + +/* + * Entry point from pam_open_session call. + */ +PAM_EXTERN int pam_sm_open_session(pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + int i, retval; + struct instance_data idata; + enum unmnt_op unmnt = NO_UNMNT; + + /* init instance data */ + idata.flags = 0; + idata.polydirs_ptr = NULL; + idata.pamh = pamh; +#ifdef WITH_SELINUX + if (is_selinux_enabled()) + idata.flags |= PAMNS_SELINUX_ENABLED; + if (ctxt_based_inst_needed()) + idata.flags |= PAMNS_CTXT_BASED_INST; +#endif + + /* Parse arguments. */ + for (i = 0; i < argc; i++) { + if (strcmp(argv[i], "debug") == 0) + idata.flags |= PAMNS_DEBUG; + if (strcmp(argv[i], "gen_hash") == 0) + idata.flags |= PAMNS_GEN_HASH; + if (strcmp(argv[i], "ignore_config_error") == 0) + idata.flags |= PAMNS_IGN_CONFIG_ERR; + if (strcmp(argv[i], "ignore_instance_parent_mode") == 0) + idata.flags |= PAMNS_IGN_INST_PARENT_MODE; + if (strcmp(argv[i], "use_current_context") == 0) { + idata.flags |= PAMNS_USE_CURRENT_CONTEXT; + idata.flags |= PAMNS_CTXT_BASED_INST; + } + if (strcmp(argv[i], "use_default_context") == 0) { + idata.flags |= PAMNS_USE_DEFAULT_CONTEXT; + idata.flags |= PAMNS_CTXT_BASED_INST; + } + if (strcmp(argv[i], "unmnt_remnt") == 0) + unmnt = UNMNT_REMNT; + if (strcmp(argv[i], "unmnt_only") == 0) + unmnt = UNMNT_ONLY; + if (strcmp(argv[i], "require_selinux") == 0) { + if (~(idata.flags & PAMNS_SELINUX_ENABLED)) { + pam_syslog(idata.pamh, LOG_ERR, + "selinux_required option given and selinux is disabled"); + return PAM_SESSION_ERR; + } + } + } + if (idata.flags & PAMNS_DEBUG) + pam_syslog(idata.pamh, LOG_DEBUG, "open_session - start"); + + retval = get_user_data(&idata); + if (retval != PAM_SUCCESS) + return retval; + + /* + * Parse namespace configuration file which lists directories to + * polyinstantiate, directory where instance directories are to + * be created and the method used for polyinstantiation. + */ + retval = parse_config_file(&idata); + if (retval != PAM_SUCCESS) { + del_polydir_list(idata.polydirs_ptr); + return PAM_SESSION_ERR; + } + + if (idata.polydirs_ptr) { + retval = setup_namespace(&idata, unmnt); + if (idata.flags & PAMNS_DEBUG) { + if (retval) + pam_syslog(idata.pamh, LOG_DEBUG, + "namespace setup failed for pid %d", getpid()); + else + pam_syslog(idata.pamh, LOG_DEBUG, + "namespace setup ok for pid %d", getpid()); + } + } else if (idata.flags & PAMNS_DEBUG) + pam_syslog(idata.pamh, LOG_DEBUG, "Nothing to polyinstantiate"); + + if (retval != PAM_SUCCESS) + del_polydir_list(idata.polydirs_ptr); + return retval; +} + + +/* + * Entry point from pam_close_session call. + */ +PAM_EXTERN int pam_sm_close_session(pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + int i, retval; + struct instance_data idata; + void *polyptr; + + /* init instance data */ + idata.flags = 0; + idata.polydirs_ptr = NULL; + idata.pamh = pamh; +#ifdef WITH_SELINUX + if (is_selinux_enabled()) + idata.flags |= PAMNS_SELINUX_ENABLED; + if (ctxt_based_inst_needed()) + idata.flags |= PAMNS_CTXT_BASED_INST; +#endif + + /* Parse arguments. */ + for (i = 0; i < argc; i++) { + if (strcmp(argv[i], "debug") == 0) + idata.flags |= PAMNS_DEBUG; + if (strcmp(argv[i], "ignore_config_error") == 0) + idata.flags |= PAMNS_IGN_CONFIG_ERR; + if (strcmp(argv[i], "no_unmount_on_close") == 0) + idata.flags |= PAMNS_NO_UNMOUNT_ON_CLOSE; + } + + if (idata.flags & PAMNS_DEBUG) + pam_syslog(idata.pamh, LOG_DEBUG, "close_session - start"); + + /* + * For certain trusted programs such as newrole, open session + * is called from a child process while the parent perfoms + * close session and pam end functions. For these commands + * pam_close_session should not perform the unmount of the + * polyinstantiatied directory because it will result in + * undoing of parents polyinstantiatiaion. These commands + * will invoke pam_namespace with the "no_unmount_on_close" + * argument. + */ + if (idata.flags & PAMNS_NO_UNMOUNT_ON_CLOSE) { + if (idata.flags & PAMNS_DEBUG) + pam_syslog(idata.pamh, LOG_DEBUG, "close_session - sucessful"); + return PAM_SUCCESS; + } + + retval = get_user_data(&idata); + if (retval != PAM_SUCCESS) + return retval; + + retval = pam_get_data(idata.pamh, NAMESPACE_POLYDIR_DATA, (const void **)&polyptr); + if (retval != PAM_SUCCESS || polyptr == NULL) + /* nothing to reset */ + return PAM_SUCCESS; + + idata.polydirs_ptr = polyptr; + + if (idata.flags & PAMNS_DEBUG) + pam_syslog(idata.pamh, LOG_DEBUG, "Resetting namespace for pid %d", + getpid()); + + retval = orig_namespace(&idata); + if (idata.flags & PAMNS_DEBUG) { + if (retval) + pam_syslog(idata.pamh, LOG_DEBUG, + "resetting namespace failed for pid %d", getpid()); + else + pam_syslog(idata.pamh, LOG_DEBUG, + "resetting namespace ok for pid %d", getpid()); + } + + pam_set_data(idata.pamh, NAMESPACE_POLYDIR_DATA, NULL, NULL); + + return PAM_SUCCESS; +} + +#ifdef PAM_STATIC + +/* static module data */ + +struct pam_module _pam_namespace_modstruct = { + "pam_namespace", + NULL, + NULL, + NULL, + pam_sm_open_session, + pam_sm_close_session, + NULL +}; +#endif diff --git a/modules/pam_namespace/pam_namespace.h b/modules/pam_namespace/pam_namespace.h new file mode 100644 index 00000000..bfc0da17 --- /dev/null +++ b/modules/pam_namespace/pam_namespace.h @@ -0,0 +1,168 @@ +/****************************************************************************** + * A module for Linux-PAM that will set the default namespace after + * establishing a session via PAM. + * + * (C) Copyright IBM Corporation 2005 + * (C) Copyright Red Hat 2006 + * All Rights Reserved. + * + * Written by: Janak Desai <janak@us.ibm.com> + * With Revisions by: Steve Grubb <sgrubb@redhat.com> + * Derived from a namespace setup patch by Chad Sellers <cdselle@tycho.nsa.gov> + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * on the rights to use, copy, modify, merge, publish, distribute, sub + * license, and/or sell copies of the Software, and to permit persons to whom + * the Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL + * IBM AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + */ + +#if !(defined(linux)) +#error THIS CODE IS KNOWN TO WORK ONLY ON LINUX !!! +#endif + +#include "config.h" + +#include <stdio.h> +#include <stdio_ext.h> +#include <unistd.h> +#include <string.h> +#include <ctype.h> +#include <stdlib.h> +#include <errno.h> +#include <syslog.h> +#include <dlfcn.h> +#include <stdarg.h> +#include <pwd.h> +#include <grp.h> +#include <limits.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/resource.h> +#include <sys/mount.h> +#include <sys/wait.h> +#include <libgen.h> +#include <fcntl.h> +#include <sched.h> +#include <glob.h> +#include <locale.h> +#include "security/pam_modules.h" +#include "security/pam_modutil.h" +#include "security/pam_ext.h" +#include "md5.h" + +#ifdef WITH_SELINUX +#include <selinux/selinux.h> +#include <selinux/get_context_list.h> +#include <selinux/context.h> +#endif + +#ifndef CLONE_NEWNS +#define CLONE_NEWNS 0x00020000 /* Flag to create new namespace */ +#endif + +/* + * Module defines + */ +#ifndef SECURECONF_DIR +#define SECURECONF_DIR "/etc/security/" +#endif + +#define PAM_NAMESPACE_CONFIG (SECURECONF_DIR "namespace.conf") +#define NAMESPACE_INIT_SCRIPT (SECURECONF_DIR "namespace.init") +#define NAMESPACE_D_DIR (SECURECONF_DIR "namespace.d/") +#define NAMESPACE_D_GLOB (SECURECONF_DIR "namespace.d/*.conf") + +/* module flags */ +#define PAMNS_DEBUG 0x00000100 /* Running in debug mode */ +#define PAMNS_SELINUX_ENABLED 0x00000400 /* SELinux is enabled */ +#define PAMNS_CTXT_BASED_INST 0x00000800 /* Context based instance needed */ +#define PAMNS_GEN_HASH 0x00002000 /* Generate md5 hash for inst names */ +#define PAMNS_IGN_CONFIG_ERR 0x00004000 /* Ignore format error in conf file */ +#define PAMNS_IGN_INST_PARENT_MODE 0x00008000 /* Ignore instance parent mode */ +#define PAMNS_NO_UNMOUNT_ON_CLOSE 0x00010000 /* no unmount at session close */ +#define PAMNS_USE_CURRENT_CONTEXT 0x00020000 /* use getcon instead of getexeccon */ +#define PAMNS_USE_DEFAULT_CONTEXT 0x00040000 /* use get_default_context instead of getexeccon */ + +/* polydir flags */ +#define POLYDIR_EXCLUSIVE 0x00000001 /* polyinstatiate exclusively for override uids */ +#define POLYDIR_CREATE 0x00000002 /* create the polydir */ +#define POLYDIR_NOINIT 0x00000004 /* no init script */ +#define POLYDIR_SHARED 0x00000008 /* share context/level instances among users */ +#define POLYDIR_ISCRIPT 0x00000010 /* non default init script */ + + +#define NAMESPACE_MAX_DIR_LEN 80 +#define NAMESPACE_POLYDIR_DATA "pam_namespace:polydir_data" + +/* + * Polyinstantiation method options, based on user, security context + * or both + */ +enum polymethod { + NONE, + USER, + CONTEXT, + LEVEL, + TMPDIR, + TMPFS +}; + +/* + * Depending on the application using this namespace module, we + * may need to unmount priviously bind mounted instance directory. + * Applications such as login and sshd, that establish a new + * session unmount of instance directory is not needed. For applications + * such as su and newrole, that switch the identity, this module + * has to unmount previous instance directory first and re-mount + * based on the new indentity. For other trusted applications that + * just want to undo polyinstantiation, only unmount of previous + * instance directory is needed. + */ +enum unmnt_op { + NO_UNMNT, + UNMNT_REMNT, + UNMNT_ONLY, +}; + +/* + * Structure that holds information about a directory to polyinstantiate + */ +struct polydir_s { + char dir[PATH_MAX]; /* directory to polyinstantiate */ + char rdir[PATH_MAX]; /* directory to unmount (based on RUSER) */ + char instance_prefix[PATH_MAX]; /* prefix for instance dir path name */ + enum polymethod method; /* method used to polyinstantiate */ + unsigned int num_uids; /* number of override uids */ + uid_t *uid; /* list of override uids */ + unsigned int flags; /* polydir flags */ + char *init_script; /* path to init script */ + uid_t owner; /* user which should own the polydir */ + gid_t group; /* group which should own the polydir */ + mode_t mode; /* mode of the polydir */ + struct polydir_s *next; /* pointer to the next polydir entry */ +}; + +struct instance_data { + pam_handle_t *pamh; /* The pam handle for this instance */ + struct polydir_s *polydirs_ptr; /* The linked list pointer */ + char user[LOGIN_NAME_MAX]; /* User name */ + char ruser[LOGIN_NAME_MAX]; /* Requesting user name */ + uid_t uid; /* The uid of the user */ + gid_t gid; /* The gid of the user's primary group */ + uid_t ruid; /* The uid of the requesting user */ + unsigned long flags; /* Flags for debug, selinux etc */ +}; diff --git a/modules/pam_namespace/tst-pam_namespace b/modules/pam_namespace/tst-pam_namespace new file mode 100755 index 00000000..c929dfcf --- /dev/null +++ b/modules/pam_namespace/tst-pam_namespace @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_namespace.so diff --git a/modules/pam_nologin/Makefile.am b/modules/pam_nologin/Makefile.am new file mode 100644 index 00000000..02840dde --- /dev/null +++ b/modules/pam_nologin/Makefile.am @@ -0,0 +1,31 @@ +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README $(MANS) $(XMLS) tst-pam_nologin + +TESTS = tst-pam_nologin + +man_MANS = pam_nologin.8 +XMLS = README.xml pam_nologin.8.xml + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_nologin.la +pam_nologin_la_LIBADD = -L$(top_builddir)/libpam -lpam + +if ENABLE_REGENERATE_MAN +noinst_DATA = README +README: pam_nologin.8.xml +-include $(top_srcdir)/Make.xml.rules +endif + diff --git a/modules/pam_nologin/Makefile.in b/modules/pam_nologin/Makefile.in new file mode 100644 index 00000000..fd41dd3f --- /dev/null +++ b/modules/pam_nologin/Makefile.in @@ -0,0 +1,667 @@ +# Makefile.in generated by automake 1.10.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 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uninstall-securelibLTLIBRARIES + +@ENABLE_REGENERATE_MAN_TRUE@README: pam_nologin.8.xml +@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_nologin/README b/modules/pam_nologin/README new file mode 100644 index 00000000..3ffa591d --- /dev/null +++ b/modules/pam_nologin/README @@ -0,0 +1,41 @@ +pam_nologin — Prevent non-root users from login + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +pam_nologin is a PAM module that prevents users from logging into the system +when /etc/nologin exists. The contents of the /etc/nologin file are displayed +to the user. The pam_nologin module has no effect on the root user's ability to +log in. + +OPTIONS + +file=/path/nologin + + Use this file instead the default /etc/nologin. + +successok + + Return PAM_SUCCESS if no file exists, the default is PAM_IGNORE. + +EXAMPLES + +The suggested usage for /etc/pam.d/login is: + +auth required pam_nologin.so + + +NOTES + +In order to make this module effective, all login methods should be secured by +it. It should be used as a required method listed before any sufficient methods +in order to get standard Unix nologin semantics. Note, the use of successok +module argument causes the module to return PAM_SUCCESS and as such would break +such a configuration - failing sufficient modules would lead to a successful +login because the nologin module succeeded. + +AUTHOR + +pam_nologin was written by Michael K. Johnson <johnsonm@redhat.com>. + diff --git a/modules/pam_nologin/README.xml b/modules/pam_nologin/README.xml new file mode 100644 index 00000000..bc0808e7 --- /dev/null +++ b/modules/pam_nologin/README.xml @@ -0,0 +1,46 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_nologin.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_nologin.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_nologin-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_nologin.8.xml" xpointer='xpointer(//refsect1[@id = "pam_nologin-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_nologin.8.xml" xpointer='xpointer(//refsect1[@id = "pam_nologin-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_nologin.8.xml" xpointer='xpointer(//refsect1[@id = "pam_nologin-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_nologin.8.xml" xpointer='xpointer(//refsect1[@id = "pam_nologin-note"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_nologin.8.xml" xpointer='xpointer(//refsect1[@id = "pam_nologin-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_nologin/pam_nologin.8 b/modules/pam_nologin/pam_nologin.8 new file mode 100644 index 00000000..0ddad026 --- /dev/null +++ b/modules/pam_nologin/pam_nologin.8 @@ -0,0 +1,110 @@ +.\" Title: pam_nologin +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_NOLOGIN" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_nologin - Prevent non-root users from login +.SH "SYNOPSIS" +.HP 15 +\fBpam_nologin\.so\fR [file=\fI/path/nologin\fR] [successok] +.SH "DESCRIPTION" +.PP +pam_nologin is a PAM module that prevents users from logging into the system when +\fI/etc/nologin\fR +exists\. The contents of the +\fI/etc/nologin\fR +file are displayed to the user\. The pam_nologin module has no effect on the root user\'s ability to log in\. +.SH "OPTIONS" +.PP +\fBfile=\fR\fB\fI/path/nologin\fR\fR +.RS 4 +Use this file instead the default +\fI/etc/nologin\fR\. +.RE +.PP +\fBsuccessok\fR +.RS 4 +Return PAM_SUCCESS if no file exists, the default is PAM_IGNORE\. +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +The +\fBauth\fR +and +\fBacct\fR +services are supported\. +.SH "RETURN VALUES" +.PP +PAM_AUTH_ERR +.RS 4 +The user is not root and +\fI/etc/nologin\fR +exists, so the user is not permitted to log in\. +.RE +.PP +PAM_BUF_ERR +.RS 4 +Memory buffer error\. +.RE +.PP +PAM_IGNORE +.RS 4 +This is the default return value\. +.RE +.PP +PAM_SUCCESS +.RS 4 +Success: either the user is root or the +\fI/etc/nologin\fR +file does not exist\. +.RE +.PP +PAM_USER_UNKNOWN +.RS 4 +User not known to the underlying authentication module\. +.RE +.SH "EXAMPLES" +.PP +The suggested usage for +\fI/etc/pam\.d/login\fR +is: +.sp +.RS 4 +.nf +auth required pam_nologin\.so + +.fi +.RE +.sp +.SH "NOTES" +.PP +In order to make this module effective, all login methods should be secured by it\. It should be used as a +\fIrequired\fR +method listed before any +\fIsufficient\fR +methods in order to get standard Unix nologin semantics\. Note, the use of +\fBsuccessok\fR +module argument causes the module to return +\fIPAM_SUCCESS\fR +and as such would break such a configuration \- failing +\fIsufficient\fR +modules would lead to a successful login because the nologin module +\fIsucceeded\fR\. +.SH "SEE ALSO" +.PP + +\fBnologin\fR(5), +\fBpam.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_nologin was written by Michael K\. Johnson <johnsonm@redhat\.com>\. diff --git a/modules/pam_nologin/pam_nologin.8.xml b/modules/pam_nologin/pam_nologin.8.xml new file mode 100644 index 00000000..9710df9d --- /dev/null +++ b/modules/pam_nologin/pam_nologin.8.xml @@ -0,0 +1,174 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_nologin"> + + <refmeta> + <refentrytitle>pam_nologin</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_nologin-name"> + <refname>pam_nologin</refname> + <refpurpose>Prevent non-root users from login</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_nologin-cmdsynopsis"> + <command>pam_nologin.so</command> + <arg choice="opt"> + file=<replaceable>/path/nologin</replaceable> + </arg> + <arg choice="opt"> + successok + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_nologin-description"> + + <title>DESCRIPTION</title> + + <para> + pam_nologin is a PAM module that prevents users from logging into + the system when <filename>/etc/nologin</filename> exists. The contents + of the <filename>/etc/nologin</filename> file are displayed to the + user. The pam_nologin module has no effect on the root user's ability + to log in. + </para> + </refsect1> + + <refsect1 id="pam_nologin-options"> + + <title>OPTIONS</title> + <variablelist> + <varlistentry> + <term> + <option>file=<replaceable>/path/nologin</replaceable></option> + </term> + <listitem> + <para> + Use this file instead the default + <filename>/etc/nologin</filename>. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>successok</option> + </term> + <listitem> + <para> + Return PAM_SUCCESS if no file exists, the default is PAM_IGNORE. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_nologin-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + The <option>auth</option> and <option>acct</option> services are + supported. + </para> + </refsect1> + + <refsect1 id='pam_nologin-return_values'> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_AUTH_ERR</term> + <listitem> + <para> + The user is not root and <filename>/etc/nologin</filename> + exists, so the user is not permitted to log in. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_BUF_ERR</term> + <listitem> + <para>Memory buffer error.</para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_IGNORE</term> + <listitem> + <para> + This is the default return value. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + Success: either the user is root or the + <filename>/etc/nologin</filename> file does not exist. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_USER_UNKNOWN</term> + <listitem> + <para> + User not known to the underlying authentication module. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id='pam_nologin-examples'> + <title>EXAMPLES</title> + <para> + The suggested usage for <filename>/etc/pam.d/login</filename> is: + <programlisting> +auth required pam_nologin.so + </programlisting> + </para> + </refsect1> + <refsect1 id='pam_nologin-note'> + <title>NOTES</title> + <para> + In order to make this module effective, all login methods should be + secured by it. It should be used as a <emphasis>required</emphasis> + method listed before any <emphasis>sufficient</emphasis> methods in + order to get standard Unix nologin semantics. Note, the use of + <option>successok</option> module argument causes the module to + return <emphasis>PAM_SUCCESS</emphasis> and as such would break + such a configuration - failing <emphasis>sufficient</emphasis> modules + would lead to a successful login because the nologin module + <emphasis>succeeded</emphasis>. + </para> + </refsect1> + + <refsect1 id='pam_nologin-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>nologin</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_nologin-author'> + <title>AUTHOR</title> + <para> + pam_nologin was written by Michael K. Johnson <johnsonm@redhat.com>. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_nologin/pam_nologin.c b/modules/pam_nologin/pam_nologin.c new file mode 100644 index 00000000..570d9dc3 --- /dev/null +++ b/modules/pam_nologin/pam_nologin.c @@ -0,0 +1,180 @@ +/* pam_nologin module */ + +/* + * $Id: pam_nologin.c,v 1.11 2005/09/22 22:16:02 ldv Exp $ + * + * Written by Michael K. Johnson <johnsonm@redhat.com> 1996/10/24 + * + */ + +#include "config.h" + +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <fcntl.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <syslog.h> +#include <pwd.h> + +#include <security/_pam_macros.h> +/* + * here, we make a definition for the externally accessible function + * in this file (this definition is required for static a module + * but strongly encouraged generally) it is used to instruct the + * modules include file to define the function prototypes. + */ + +#define PAM_SM_AUTH +#define PAM_SM_ACCOUNT + +#include <security/pam_modules.h> +#include <security/pam_modutil.h> +#include <security/pam_ext.h> + +/* + * parse some command line options + */ +struct opt_s { + int retval_when_nofile; + const char *nologin_file; +}; + +static void +parse_args(pam_handle_t *pamh, int argc, const char **argv, struct opt_s *opts) +{ + int i; + + memset(opts, 0, sizeof(*opts)); + + opts->retval_when_nofile = PAM_IGNORE; + opts->nologin_file = "/etc/nologin"; + + for (i=0; i<argc; ++i) { + if (!strcmp("successok", argv[i])) { + opts->retval_when_nofile = PAM_SUCCESS; + } else if (!strncmp("file=", argv[i], 5)) { + opts->nologin_file = argv[i] + 5; + } else { + pam_syslog(pamh, LOG_ERR, "unknown option: %s", argv[i]); + } + } +} + +/* + * do the meat of the work for this module + */ + +static int perform_check(pam_handle_t *pamh, struct opt_s *opts) +{ + const char *username; + int retval = opts->retval_when_nofile; + int fd; + + if ((pam_get_user(pamh, &username, NULL) != PAM_SUCCESS) || !username) { + pam_syslog(pamh, LOG_WARNING, "cannot determine username"); + return PAM_USER_UNKNOWN; + } + + if ((fd = open(opts->nologin_file, O_RDONLY, 0)) >= 0) { + + char *mtmp=NULL; + int msg_style = PAM_TEXT_INFO; + struct passwd *user_pwd; + struct stat st; + + user_pwd = pam_modutil_getpwnam(pamh, username); + if (user_pwd == NULL) { + retval = PAM_USER_UNKNOWN; + msg_style = PAM_ERROR_MSG; + } else if (user_pwd->pw_uid) { + retval = PAM_AUTH_ERR; + msg_style = PAM_ERROR_MSG; + } + + /* fill in message buffer with contents of /etc/nologin */ + if (fstat(fd, &st) < 0) { + /* give up trying to display message */ + goto clean_up_fd; + } + + mtmp = malloc(st.st_size+1); + if (!mtmp) { + pam_syslog(pamh, LOG_ERR, "out of memory"); + retval = PAM_BUF_ERR; + goto clean_up_fd; + } + + if (pam_modutil_read(fd, mtmp, st.st_size) == st.st_size) { + mtmp[st.st_size] = '\0'; + (void) pam_prompt (pamh, msg_style, NULL, "%s", mtmp); + } + else + retval = PAM_SYSTEM_ERR; + + free(mtmp); + + clean_up_fd: + + close(fd); + } + + return retval; +} + +/* --- authentication management functions --- */ + +PAM_EXTERN int +pam_sm_authenticate (pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + struct opt_s opts; + + parse_args(pamh, argc, argv, &opts); + + return perform_check(pamh, &opts); +} + +PAM_EXTERN int +pam_sm_setcred (pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc, const char **argv) +{ + struct opt_s opts; + + parse_args(pamh, argc, argv, &opts); + + return opts.retval_when_nofile; +} + +/* --- account management function --- */ + +PAM_EXTERN int +pam_sm_acct_mgmt(pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + struct opt_s opts; + + parse_args(pamh, argc, argv, &opts); + + return perform_check(pamh, &opts); +} + + +#ifdef PAM_STATIC + +/* static module data */ + +struct pam_module _pam_nologin_modstruct = { + "pam_nologin", + pam_sm_authenticate, + pam_sm_setcred, + pam_sm_acct_mgmt, + NULL, + NULL, + NULL, +}; + +#endif /* PAM_STATIC */ + +/* end of module definition */ diff --git a/modules/pam_nologin/tst-pam_nologin b/modules/pam_nologin/tst-pam_nologin new file mode 100755 index 00000000..caa91b67 --- /dev/null +++ b/modules/pam_nologin/tst-pam_nologin @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_nologin.so diff --git a/modules/pam_permit/Makefile.am b/modules/pam_permit/Makefile.am new file mode 100644 index 00000000..aa6db7a1 --- /dev/null +++ b/modules/pam_permit/Makefile.am @@ -0,0 +1,31 @@ +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README $(MANS) $(XMLS) tst-pam_permit + +man_MANS = pam_permit.8 +XMLS = README.xml pam_permit.8.xml + +TESTS = tst-pam_permit + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_permit.la +pam_permit_la_LIBADD = -L$(top_builddir)/libpam -lpam + +if ENABLE_REGENERATE_MAN +noinst_DATA = README +README: pam_permit.8.xml +-include $(top_srcdir)/Make.xml.rules +endif + diff --git a/modules/pam_permit/Makefile.in b/modules/pam_permit/Makefile.in new file mode 100644 index 00000000..30c5cd6e --- /dev/null +++ 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mostlyclean mostlyclean-compile \ + mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \ + tags uninstall uninstall-am uninstall-man uninstall-man8 \ + uninstall-securelibLTLIBRARIES + +@ENABLE_REGENERATE_MAN_TRUE@README: pam_permit.8.xml +@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_permit/README b/modules/pam_permit/README new file mode 100644 index 00000000..d479dccd --- /dev/null +++ b/modules/pam_permit/README @@ -0,0 +1,30 @@ +pam_permit — The promiscuous module + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +pam_permit is a PAM module that always permit access. It does nothing else. + +In the case of authentication, the user's name will be set to nobody if the +application didn't set one. Many applications and PAM modules become confused +if this name is unknown. + +This module is very dangerous. It should be used with extreme caution. + +OPTIONS + +This module does not recognise any options. + +EXAMPLES + +Add this line to your other login entries to disable account management, but +continue to permit users to log in. + +account required pam_permit.so + + +AUTHOR + +pam_permit was written by Andrew G. Morgan, <morgan@kernel.org>. + diff --git a/modules/pam_permit/README.xml b/modules/pam_permit/README.xml new file mode 100644 index 00000000..acb38b51 --- /dev/null +++ b/modules/pam_permit/README.xml @@ -0,0 +1,41 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_permit.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_permit.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_permit-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_permit.8.xml" xpointer='xpointer(//refsect1[@id = "pam_permit-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_permit.8.xml" xpointer='xpointer(//refsect1[@id = "pam_permit-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_permit.8.xml" xpointer='xpointer(//refsect1[@id = "pam_permit-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_permit.8.xml" xpointer='xpointer(//refsect1[@id = "pam_permit-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_permit/pam_permit.8 b/modules/pam_permit/pam_permit.8 new file mode 100644 index 00000000..6011d1a3 --- /dev/null +++ b/modules/pam_permit/pam_permit.8 @@ -0,0 +1,64 @@ +.\" Title: pam_permit +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_PERMIT" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_permit - The promiscuous module +.SH "SYNOPSIS" +.HP 14 +\fBpam_permit\.so\fR +.SH "DESCRIPTION" +.PP +pam_permit is a PAM module that always permit access\. It does nothing else\. +.PP +In the case of authentication, the user\'s name will be set to +\fInobody\fR +if the application didn\'t set one\. Many applications and PAM modules become confused if this name is unknown\. +.PP +This module is very dangerous\. It should be used with extreme caution\. +.SH "OPTIONS" +.PP +This module does not recognise any options\. +.SH "MODULE SERVICES PROVIDED" +.PP +The services +\fBauth\fR, +\fBaccount\fR, +\fBpassword\fR +and +\fBsession\fR +are supported\. +.SH "RETURN VALUES" +.PP +PAM_SUCCESS +.RS 4 +This module always returns this value\. +.RE +.SH "EXAMPLES" +.PP +Add this line to your other login entries to disable account management, but continue to permit users to log in\. +.sp +.RS 4 +.nf +account required pam_permit\.so + +.fi +.RE +.sp +.SH "SEE ALSO" +.PP + +\fBpam.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_permit was written by Andrew G\. Morgan, <morgan@kernel\.org>\. diff --git a/modules/pam_permit/pam_permit.8.xml b/modules/pam_permit/pam_permit.8.xml new file mode 100644 index 00000000..4db7a963 --- /dev/null +++ b/modules/pam_permit/pam_permit.8.xml @@ -0,0 +1,105 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_permit"> + + <refmeta> + <refentrytitle>pam_permit</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_permit-name"> + <refname>pam_permit</refname> + <refpurpose>The promiscuous module</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_permit-cmdsynopsis"> + <command>pam_permit.so</command> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_permit-description"> + + <title>DESCRIPTION</title> + + <para> + pam_permit is a PAM module that always permit access. It does + nothing else. + </para> + <para> + In the case of authentication, the user's name will be set to + <emphasis>nobody</emphasis> if the application didn't set one. + Many applications and PAM modules become confused if this name + is unknown. + </para> + <para> + This module is very dangerous. It should be used with extreme + caution. + </para> + </refsect1> + + <refsect1 id="pam_permit-options"> + + <title>OPTIONS</title> + <para> This module does not recognise any options.</para> + </refsect1> + + <refsect1 id="pam_permit-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + The services <option>auth</option>, <option>account</option>, + <option>password</option> and <option>session</option> are supported. + </para> + </refsect1> + + <refsect1 id='pam_permit-return_values'> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + This module always returns this value. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id='pam_permit-examples'> + <title>EXAMPLES</title> + <para> + Add this line to your other login entries to disable account + management, but continue to permit users to log in. + <programlisting> +account required pam_permit.so + </programlisting> + </para> + </refsect1> + + <refsect1 id='pam_permit-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_permit-author'> + <title>AUTHOR</title> + <para> + pam_permit was written by Andrew G. Morgan, <morgan@kernel.org>. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_permit/pam_permit.c b/modules/pam_permit/pam_permit.c new file mode 100644 index 00000000..d85f8d75 --- /dev/null +++ b/modules/pam_permit/pam_permit.c @@ -0,0 +1,116 @@ +/* pam_permit module */ + +/* + * $Id: pam_permit.c,v 1.4 2005/09/17 08:50:29 t8m Exp $ + * + * Written by Andrew Morgan <morgan@parc.power.net> 1996/3/11 + * + */ + +#include "config.h" + +#define DEFAULT_USER "nobody" + +#include <stdio.h> + +/* + * here, we make definitions for the externally accessible functions + * in this file (these definitions are required for static modules + * but strongly encouraged generally) they are used to instruct the + * modules include file to define their prototypes. + */ + +#define PAM_SM_AUTH +#define PAM_SM_ACCOUNT +#define PAM_SM_SESSION +#define PAM_SM_PASSWORD + +#include <security/pam_modules.h> +#include <security/_pam_macros.h> + +/* --- authentication management functions --- */ + +PAM_EXTERN int +pam_sm_authenticate(pam_handle_t *pamh, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + int retval; + const char *user=NULL; + + /* + * authentication requires we know who the user wants to be + */ + retval = pam_get_user(pamh, &user, NULL); + if (retval != PAM_SUCCESS) { + D(("get user returned error: %s", pam_strerror(pamh,retval))); + return retval; + } + if (user == NULL || *user == '\0') { + D(("username not known")); + retval = pam_set_item(pamh, PAM_USER, (const void *) DEFAULT_USER); + if (retval != PAM_SUCCESS) + return PAM_USER_UNKNOWN; + } + user = NULL; /* clean up */ + + return PAM_SUCCESS; +} + +PAM_EXTERN int +pam_sm_setcred(pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_SUCCESS; +} + +/* --- account management functions --- */ + +PAM_EXTERN int +pam_sm_acct_mgmt(pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_SUCCESS; +} + +/* --- password management --- */ + +PAM_EXTERN int +pam_sm_chauthtok(pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_SUCCESS; +} + +/* --- session management --- */ + +PAM_EXTERN int +pam_sm_open_session(pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_SUCCESS; +} + +PAM_EXTERN int +pam_sm_close_session(pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_SUCCESS; +} + +/* end of module definition */ + +#ifdef PAM_STATIC + +/* static module data */ + +struct pam_module _pam_permit_modstruct = { + "pam_permit", + pam_sm_authenticate, + pam_sm_setcred, + pam_sm_acct_mgmt, + pam_sm_open_session, + pam_sm_close_session, + pam_sm_chauthtok +}; + +#endif diff --git a/modules/pam_permit/tst-pam_permit b/modules/pam_permit/tst-pam_permit new file mode 100755 index 00000000..8adb427f --- /dev/null +++ b/modules/pam_permit/tst-pam_permit @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_permit.so diff --git a/modules/pam_rhosts/Makefile.am b/modules/pam_rhosts/Makefile.am new file mode 100644 index 00000000..547ad621 --- /dev/null +++ b/modules/pam_rhosts/Makefile.am @@ -0,0 +1,32 @@ +# +# Copyright (c) 2005, 2006, 2008 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README $(MANS) $(XMLS) tst-pam_rhosts + +TESTS = tst-pam_rhosts + +man_MANS = pam_rhosts.8 + +XMLS = README.xml pam_rhosts.8.xml + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_rhosts.la +pam_rhosts_la_LIBADD = -L$(top_builddir)/libpam -lpam + +if ENABLE_REGENERATE_MAN +noinst_DATA = README +README: pam_rhosts.8.xml +-include $(top_srcdir)/Make.xml.rules +endif + diff --git a/modules/pam_rhosts/Makefile.in b/modules/pam_rhosts/Makefile.in new file mode 100644 index 00000000..45e32dca --- /dev/null +++ b/modules/pam_rhosts/Makefile.in @@ -0,0 +1,667 @@ +# Makefile.in generated by automake 1.10.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY, to the extent permitted by law; without +# even the implied warranty of MERCHANTABILITY or FITNESS FOR A +# PARTICULAR PURPOSE. + +@SET_MAKE@ + +# +# Copyright (c) 2005, 2006, 2008 Thorsten Kukuk <kukuk@suse.de> +# + + +VPATH = @srcdir@ +pkgdatadir 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install-ps install-ps-am \ + install-securelibLTLIBRARIES install-strip installcheck \ + installcheck-am installdirs maintainer-clean \ + maintainer-clean-generic mostlyclean mostlyclean-compile \ + mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \ + tags uninstall uninstall-am uninstall-man uninstall-man8 \ + uninstall-securelibLTLIBRARIES + +@ENABLE_REGENERATE_MAN_TRUE@README: pam_rhosts.8.xml +@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_rhosts/README b/modules/pam_rhosts/README new file mode 100644 index 00000000..b1911785 --- /dev/null +++ b/modules/pam_rhosts/README @@ -0,0 +1,56 @@ +pam_rhosts — The rhosts PAM module + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +This module performs the standard network authentication for services, as used +by traditional implementations of rlogin and rsh etc. + +The authentication mechanism of this module is based on the contents of two +files; /etc/hosts.equiv (or and ~/.rhosts. Firstly, hosts listed in the former +file are treated as equivalent to the localhost. Secondly, entries in the +user's own copy of the latter file is used to map "remote-host remote-user" +pairs to that user's account on the current host. Access is granted to the user +if their host is present in /etc/hosts.equiv and their remote account is +identical to their local one, or if their remote account has an entry in their +personal configuration file. + +The module authenticates a remote user (internally specified by the item +PAM_RUSER connecting from the remote host (internally specified by the item +PAM_RHOST). Accordingly, for applications to be compatible this authentication +module they must set these items prior to calling pam_authenticate(). The +module is not capable of independently probing the network connection for such +information. + +OPTIONS + +debug + + Print debug information. + +silent + + Don't print informative messages. + +superuser=account + + Handle account as root. + +EXAMPLES + +To grant a remote user access by /etc/hosts.equiv or .rhosts for rsh add the +following lines to /etc/pam.d/rsh: + +#%PAM-1.0 +# +auth required pam_rhosts.so +auth required pam_nologin.so +auth required pam_env.so +auth required pam_unix.so + + +AUTHOR + +pam_rhosts was written by Thorsten Kukuk <kukuk@thkukuk.de> + diff --git a/modules/pam_rhosts/README.xml b/modules/pam_rhosts/README.xml new file mode 100644 index 00000000..5d3307e7 --- /dev/null +++ b/modules/pam_rhosts/README.xml @@ -0,0 +1,41 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_rhosts.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_rhosts.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_rhosts-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_rhosts.8.xml" xpointer='xpointer(//refsect1[@id = "pam_rhosts-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_rhosts.8.xml" xpointer='xpointer(//refsect1[@id = "pam_rhosts-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_rhosts.8.xml" xpointer='xpointer(//refsect1[@id = "pam_rhosts-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_rhosts.8.xml" xpointer='xpointer(//refsect1[@id = "pam_rhosts-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_rhosts/pam_rhosts.8 b/modules/pam_rhosts/pam_rhosts.8 new file mode 100644 index 00000000..e21da4ec --- /dev/null +++ b/modules/pam_rhosts/pam_rhosts.8 @@ -0,0 +1,108 @@ +.\" Title: pam_rhosts +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_RHOSTS" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_rhosts - The rhosts PAM module +.SH "SYNOPSIS" +.HP 14 +\fBpam_rhosts\.so\fR +.SH "DESCRIPTION" +.PP +This module performs the standard network authentication for services, as used by traditional implementations of +\fBrlogin\fR +and +\fBrsh\fR +etc\. +.PP +The authentication mechanism of this module is based on the contents of two files; +\fI/etc/hosts\.equiv\fR +(or and +\fI~/\.rhosts\fR\. Firstly, hosts listed in the former file are treated as equivalent to the localhost\. Secondly, entries in the user\'s own copy of the latter file is used to map "\fIremote\-host remote\-user\fR" pairs to that user\'s account on the current host\. Access is granted to the user if their host is present in +\fI/etc/hosts\.equiv\fR +and their remote account is identical to their local one, or if their remote account has an entry in their personal configuration file\. +.PP +The module authenticates a remote user (internally specified by the item +\fIPAM_RUSER\fR +connecting from the remote host (internally specified by the item +\fBPAM_RHOST\fR)\. Accordingly, for applications to be compatible this authentication module they must set these items prior to calling +\fBpam_authenticate()\fR\. The module is not capable of independently probing the network connection for such information\. +.SH "OPTIONS" +.PP +\fBdebug\fR +.RS 4 +Print debug information\. +.RE +.PP +\fBsilent\fR +.RS 4 +Don\'t print informative messages\. +.RE +.PP +\fBsuperuser=\fR\fB\fIaccount\fR\fR +.RS 4 +Handle +\fIaccount\fR +as root\. +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +Only the +\fBauth\fR +service is supported\. +.SH "RETURN VALUES" +.PP +PAM_AUTH_ERR +.RS 4 +The remote host, remote user name or the local user name couldn\'t be determined or access was denied by +\fI\.rhosts\fR +file\. +.RE +.PP +PAM_USER_UNKNOWN +.RS 4 +User is not known to system\. +.RE +.SH "EXAMPLES" +.PP +To grant a remote user access by +\fI/etc/hosts\.equiv\fR +or +\fI\.rhosts\fR +for +\fBrsh\fR +add the following lines to +\fI/etc/pam\.d/rsh\fR: +.sp +.RS 4 +.nf +#%PAM\-1\.0 +# +auth required pam_rhosts\.so +auth required pam_nologin\.so +auth required pam_env\.so +auth required pam_unix\.so + +.fi +.RE +.sp +.SH "SEE ALSO" +.PP + +\fBrootok\fR(3), +\fBhosts.equiv\fR(5), +\fBrhosts\fR(5), +\fBpam.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_rhosts was written by Thorsten Kukuk <kukuk@thkukuk\.de> diff --git a/modules/pam_rhosts/pam_rhosts.8.xml b/modules/pam_rhosts/pam_rhosts.8.xml new file mode 100644 index 00000000..e559f315 --- /dev/null +++ b/modules/pam_rhosts/pam_rhosts.8.xml @@ -0,0 +1,171 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_rhosts"> + + <refmeta> + <refentrytitle>pam_rhosts</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_rhosts-name"> + <refname>pam_rhosts</refname> + <refpurpose>The rhosts PAM module</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_rhosts-cmdsynopsis"> + <command>pam_rhosts.so</command> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_rhosts-description"> + + <title>DESCRIPTION</title> + + <para> + This module performs the standard network authentication for services, + as used by traditional implementations of <command>rlogin</command> + and <command>rsh</command> etc. + </para> + <para> + The authentication mechanism of this module is based on the contents + of two files; <filename>/etc/hosts.equiv</filename> (or + and <filename>~/.rhosts</filename>. Firstly, hosts listed in the + former file are treated as equivalent to the localhost. Secondly, + entries in the user's own copy of the latter file is used to map + "<emphasis>remote-host remote-user</emphasis>" pairs to that user's + account on the current host. Access is granted to the user if their + host is present in <filename>/etc/hosts.equiv</filename> and their + remote account is identical to their local one, or if their remote + account has an entry in their personal configuration file. + </para> + <para> + The module authenticates a remote user (internally specified by the + item <parameter>PAM_RUSER</parameter> connecting from the remote + host (internally specified by the item <command>PAM_RHOST</command>). + Accordingly, for applications to be compatible this authentication + module they must set these items prior to calling + <function>pam_authenticate()</function>. The module is not capable + of independently probing the network connection for such information. + </para> + </refsect1> + + <refsect1 id="pam_rhosts-options"> + <title>OPTIONS</title> + <variablelist> + <varlistentry> + <term> + <option>debug</option> + </term> + <listitem> + <para> + Print debug information. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>silent</option> + </term> + <listitem> + <para> + Don't print informative messages. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>superuser=<replaceable>account</replaceable></option> + </term> + <listitem> + <para> + Handle <replaceable>account</replaceable> as root. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_rhosts-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + Only the <option>auth</option> service is supported. + </para> + </refsect1> + + <refsect1 id='pam_rhosts-return_values'> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_AUTH_ERR</term> + <listitem> + <para> + The remote host, remote user name or the local user name + couldn't be determined or access was denied by + <filename>.rhosts</filename> file. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_USER_UNKNOWN</term> + <listitem> + <para> + User is not known to system. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id='pam_rhosts-examples'> + <title>EXAMPLES</title> + <para> + To grant a remote user access by <filename>/etc/hosts.equiv</filename> + or <filename>.rhosts</filename> for <command>rsh</command> add the + following lines to <filename>/etc/pam.d/rsh</filename>: + <programlisting> +#%PAM-1.0 +# +auth required pam_rhosts.so +auth required pam_nologin.so +auth required pam_env.so +auth required pam_unix.so + </programlisting> + </para> + </refsect1> + + <refsect1 id='pam_rhosts-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>rootok</refentrytitle><manvolnum>3</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>hosts.equiv</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>rhosts</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_rhosts-author'> + <title>AUTHOR</title> + <para> + pam_rhosts was written by Thorsten Kukuk <kukuk@thkukuk.de> + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_rhosts/pam_rhosts.c b/modules/pam_rhosts/pam_rhosts.c new file mode 100644 index 00000000..8e120614 --- /dev/null +++ b/modules/pam_rhosts/pam_rhosts.c @@ -0,0 +1,155 @@ +/* + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, and the entire permission notice in its entirety, + * including the disclaimer of warranties. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * ALTERNATIVELY, this product may be distributed under the terms of + * the GNU Public License, in which case the provisions of the GPL are + * required INSTEAD OF the above restrictions. (This clause is + * necessary due to a potential bad interaction between the GPL and + * the restrictions contained in a BSD-style copyright.) + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + */ +#include "config.h" + +#include <pwd.h> +#include <netdb.h> +#include <string.h> +#include <syslog.h> + +#define PAM_SM_AUTH /* only defines this management group */ + +#include <security/pam_modules.h> +#include <security/pam_modutil.h> +#include <security/pam_ext.h> + +PAM_EXTERN +int pam_sm_authenticate (pam_handle_t *pamh, int flags, int argc, + const char **argv) +{ + const char *luser = NULL; + const char *ruser = NULL, *rhost = NULL; + const char *opt_superuser = NULL; + const void *c_void; + int opt_debug = 0; + int opt_silent; + int as_root; + int retval; + + opt_silent = flags & PAM_SILENT; + + while (argc-- > 0) { + if (strcmp(*argv, "debug") == 0) + opt_debug = 1; + else if (strcmp (*argv, "silent") == 0 || strcmp(*argv, "suppress") == 0) + opt_silent = 1; + else if (strncmp(*argv, "superuser=", sizeof("superuser=")-1) == 0) + opt_superuser = *argv+sizeof("superuser=")-1; + else + pam_syslog(pamh, LOG_WARNING, "unrecognized option '%s'", *argv); + + ++argv; + } + + retval = pam_get_item (pamh, PAM_RHOST, &c_void); + if (retval != PAM_SUCCESS) { + pam_syslog(pamh, LOG_ERR, "could not get the remote host name"); + return retval; + } + rhost = c_void; + + retval = pam_get_item(pamh, PAM_RUSER, &c_void); + ruser = c_void; + if (retval != PAM_SUCCESS) { + pam_syslog(pamh, LOG_ERR, "could not get the remote username"); + return retval; + } + + retval = pam_get_user(pamh, &luser, NULL); + if (retval != PAM_SUCCESS) { + pam_syslog(pamh, LOG_ERR, "could not determine name of local user"); + return retval; + } + + if (rhost == NULL || ruser == NULL || luser == NULL) + return PAM_AUTH_ERR; + + if (opt_superuser && strcmp(opt_superuser, luser) == 0) + as_root = 1; + else { + struct passwd *lpwd; + + lpwd = pam_modutil_getpwnam(pamh, luser); + if (lpwd == NULL) { + if (opt_debug) + /* don't print by default, could be the users password */ + pam_syslog(pamh, LOG_DEBUG, + "user '%s' unknown to this system", luser); + return PAM_USER_UNKNOWN; + + } + as_root = (lpwd->pw_uid == 0); + } + +#ifdef HAVE_RUSEROK_AF + retval = ruserok_af (rhost, as_root, ruser, luser, PF_UNSPEC); +#else + retval = ruserok (rhost, as_root, ruser, luser); +#endif + if (retval != 0) { + if (!opt_silent || opt_debug) + pam_syslog(pamh, LOG_WARNING, "denied access to %s@%s as %s", + ruser, rhost, luser); + return PAM_AUTH_ERR; + } else { + if (!opt_silent || opt_debug) + pam_syslog(pamh, LOG_NOTICE, "allowed access to %s@%s as %s", + ruser, rhost, luser); + return PAM_SUCCESS; + } +} + + +PAM_EXTERN int +pam_sm_setcred (pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_SUCCESS; +} + + +#ifdef PAM_STATIC + +/* static module data */ + +struct pam_module _pam_rhosts_modstruct = { + "pam_rhosts", + pam_sm_authenticate, + pam_sm_setcred, + NULL, + NULL, + NULL, + NULL, +}; + +#endif diff --git a/modules/pam_rhosts/tst-pam_rhosts b/modules/pam_rhosts/tst-pam_rhosts new file mode 100755 index 00000000..65e85a98 --- /dev/null +++ b/modules/pam_rhosts/tst-pam_rhosts @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_rhosts.so diff --git a/modules/pam_rootok/Makefile.am b/modules/pam_rootok/Makefile.am new file mode 100644 index 00000000..54fe2720 --- /dev/null +++ b/modules/pam_rootok/Makefile.am @@ -0,0 +1,33 @@ +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README $(MANS) $(XMLS) tst-pam_rootok + +man_MANS = pam_rootok.8 +XMLS = README.xml pam_rootok.8.xml + +TESTS = tst-pam_rootok + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include +if HAVE_LIBSELINUX +AM_CFLAGS += -DWITH_SELINUX +endif +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_rootok.la +pam_rootok_la_LIBADD = -L$(top_builddir)/libpam -lpam @LIBSELINUX@ + +if ENABLE_REGENERATE_MAN +noinst_DATA = README +README: pam_rootok.8.xml +-include $(top_srcdir)/Make.xml.rules +endif diff --git a/modules/pam_rootok/Makefile.in b/modules/pam_rootok/Makefile.in new file mode 100644 index 00000000..41976b11 --- /dev/null +++ b/modules/pam_rootok/Makefile.in @@ -0,0 +1,669 @@ +# Makefile.in generated by automake 1.10.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006, 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+pdf-am: + +ps: ps-am + +ps-am: + +uninstall-am: uninstall-man uninstall-securelibLTLIBRARIES + +uninstall-man: uninstall-man8 + +.MAKE: install-am install-strip + +.PHONY: CTAGS GTAGS all all-am check check-TESTS check-am clean \ + clean-generic clean-libtool clean-securelibLTLIBRARIES ctags \ + distclean distclean-compile distclean-generic \ + distclean-libtool distclean-tags distdir dvi dvi-am html \ + html-am info info-am install install-am install-data \ + install-data-am install-dvi install-dvi-am install-exec \ + install-exec-am install-html install-html-am install-info \ + install-info-am install-man install-man8 install-pdf \ + install-pdf-am install-ps install-ps-am \ + install-securelibLTLIBRARIES install-strip installcheck \ + installcheck-am installdirs maintainer-clean \ + maintainer-clean-generic mostlyclean mostlyclean-compile \ + mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \ + tags uninstall uninstall-am uninstall-man uninstall-man8 \ + uninstall-securelibLTLIBRARIES + +@ENABLE_REGENERATE_MAN_TRUE@README: pam_rootok.8.xml +@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_rootok/README b/modules/pam_rootok/README new file mode 100644 index 00000000..55a44756 --- /dev/null +++ b/modules/pam_rootok/README @@ -0,0 +1,33 @@ +pam_rootok — Gain only root access + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +pam_rootok is a PAM module that authenticates the user if their UID is 0. +Applications that are created setuid-root generally retain the UID of the user +but run with the authority of an enhanced effective-UID. It is the real UID +that is checked. + +OPTIONS + +debug + + Print debug information. + +EXAMPLES + +In the case of the su(1) application the historical usage is to permit the +superuser to adopt the identity of a lesser user without the use of a password. +To obtain this behavior with PAM the following pair of lines are needed for the +corresponding entry in the /etc/pam.d/su configuration file: + +# su authentication. Root is granted access by default. +auth sufficient pam_rootok.so +auth required pam_unix.so + + +AUTHOR + +pam_rootok was written by Andrew G. Morgan, <morgan@kernel.org>. + diff --git a/modules/pam_rootok/README.xml b/modules/pam_rootok/README.xml new file mode 100644 index 00000000..6fb58cd0 --- /dev/null +++ b/modules/pam_rootok/README.xml @@ -0,0 +1,41 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_rootok.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_rootok.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_rootok-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_rootok.8.xml" xpointer='xpointer(//refsect1[@id = "pam_rootok-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_rootok.8.xml" xpointer='xpointer(//refsect1[@id = "pam_rootok-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_rootok.8.xml" xpointer='xpointer(//refsect1[@id = "pam_rootok-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_rootok.8.xml" xpointer='xpointer(//refsect1[@id = "pam_rootok-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_rootok/pam_rootok.8 b/modules/pam_rootok/pam_rootok.8 new file mode 100644 index 00000000..83ea8c09 --- /dev/null +++ b/modules/pam_rootok/pam_rootok.8 @@ -0,0 +1,83 @@ +.\" Title: pam_rootok +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_ROOTOK" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_rootok - Gain only root access +.SH "SYNOPSIS" +.HP 14 +\fBpam_rootok\.so\fR [debug] +.SH "DESCRIPTION" +.PP +pam_rootok is a PAM module that authenticates the user if their +\fIUID\fR +is +\fI0\fR\. Applications that are created setuid\-root generally retain the +\fIUID\fR +of the user but run with the authority of an enhanced effective\-UID\. It is the real +\fIUID\fR +that is checked\. +.SH "OPTIONS" +.PP +\fBdebug\fR +.RS 4 +Print debug information\. +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +Only the +\fBauth\fR +service is supported\. +.SH "RETURN VALUES" +.PP +PAM_SUCCESS +.RS 4 +The +\fIUID\fR +is +\fI0\fR\. +.RE +.PP +PAM_AUTH_ERR +.RS 4 +The +\fIUID\fR +is +\fBnot\fR +\fI0\fR\. +.RE +.SH "EXAMPLES" +.PP +In the case of the +\fBsu\fR(1) +application the historical usage is to permit the superuser to adopt the identity of a lesser user without the use of a password\. To obtain this behavior with PAM the following pair of lines are needed for the corresponding entry in the +\fI/etc/pam\.d/su\fR +configuration file: +.sp +.RS 4 +.nf +# su authentication\. Root is granted access by default\. +auth sufficient pam_rootok\.so +auth required pam_unix\.so + +.fi +.RE +.sp +.SH "SEE ALSO" +.PP + +\fBsu\fR(1), +\fBpam.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_rootok was written by Andrew G\. Morgan, <morgan@kernel\.org>\. diff --git a/modules/pam_rootok/pam_rootok.8.xml b/modules/pam_rootok/pam_rootok.8.xml new file mode 100644 index 00000000..ec8dee43 --- /dev/null +++ b/modules/pam_rootok/pam_rootok.8.xml @@ -0,0 +1,130 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_rootok"> + + <refmeta> + <refentrytitle>pam_rootok</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_rootok-name"> + <refname>pam_rootok</refname> + <refpurpose>Gain only root access</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_rootok-cmdsynopsis"> + <command>pam_rootok.so</command> + <arg choice="opt"> + debug + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_rootok-description"> + + <title>DESCRIPTION</title> + + <para> + pam_rootok is a PAM module that authenticates the user if their + <emphasis>UID</emphasis> is <emphasis>0</emphasis>. + Applications that are created setuid-root generally retain the + <emphasis>UID</emphasis> of the user but run with the authority + of an enhanced effective-UID. It is the real <emphasis>UID</emphasis> + that is checked. + </para> + </refsect1> + + <refsect1 id="pam_rootok-options"> + <title>OPTIONS</title> + <variablelist> + <varlistentry> + <term> + <option>debug</option> + </term> + <listitem> + <para> + Print debug information. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_rootok-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + Only the <option>auth</option> service is supported. + </para> + </refsect1> + + <refsect1 id='pam_rootok-return_values'> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + The <emphasis>UID</emphasis> is <emphasis>0</emphasis>. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_AUTH_ERR</term> + <listitem> + <para> + The <emphasis>UID</emphasis> is <emphasis remap='B'>not</emphasis> + <emphasis>0</emphasis>. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id='pam_rootok-examples'> + <title>EXAMPLES</title> + <para> + In the case of the <citerefentry> + <refentrytitle>su</refentrytitle><manvolnum>1</manvolnum> + </citerefentry> application the historical usage is to + permit the superuser to adopt the identity of a lesser user + without the use of a password. To obtain this behavior with PAM + the following pair of lines are needed for the corresponding entry + in the <filename>/etc/pam.d/su</filename> configuration file: + <programlisting> +# su authentication. Root is granted access by default. +auth sufficient pam_rootok.so +auth required pam_unix.so + </programlisting> + </para> + </refsect1> + + <refsect1 id='pam_rootok-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>su</refentrytitle><manvolnum>1</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_rootok-author'> + <title>AUTHOR</title> + <para> + pam_rootok was written by Andrew G. Morgan, <morgan@kernel.org>. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_rootok/pam_rootok.c b/modules/pam_rootok/pam_rootok.c new file mode 100644 index 00000000..4eb34412 --- /dev/null +++ b/modules/pam_rootok/pam_rootok.c @@ -0,0 +1,106 @@ +/* pam_rootok module */ + +/* + * $Id: pam_rootok.c,v 1.7 2005/12/12 14:45:02 ldv Exp $ + * + * Written by Andrew Morgan <morgan@linux.kernel.org> 1996/3/11 + */ + +#include "config.h" + +#include <stdio.h> +#include <unistd.h> +#include <syslog.h> +#include <stdarg.h> +#include <string.h> + +/* + * here, we make a definition for the externally accessible function + * in this file (this definition is required for static a module + * but strongly encouraged generally) it is used to instruct the + * modules include file to define the function prototypes. + */ + +#define PAM_SM_AUTH + +#include <security/pam_modules.h> +#include <security/pam_ext.h> + +#ifdef WITH_SELINUX +#include <selinux/selinux.h> +#include <selinux/av_permissions.h> +#endif + +/* argument parsing */ + +#define PAM_DEBUG_ARG 01 + +static int +_pam_parse (const pam_handle_t *pamh, int argc, const char **argv) +{ + int ctrl=0; + + /* step through arguments */ + for (ctrl=0; argc-- > 0; ++argv) { + + /* generic options */ + + if (!strcmp(*argv,"debug")) + ctrl |= PAM_DEBUG_ARG; + else { + pam_syslog(pamh, LOG_ERR, "unknown option: %s", *argv); + } + } + + return ctrl; +} + +/* --- authentication management functions (only) --- */ + +PAM_EXTERN int +pam_sm_authenticate (pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + int ctrl; + int retval = PAM_AUTH_ERR; + + ctrl = _pam_parse(pamh, argc, argv); + if (getuid() == 0) +#ifdef WITH_SELINUX + if (is_selinux_enabled()<1 || checkPasswdAccess(PASSWD__ROOTOK)==0) +#endif + retval = PAM_SUCCESS; + + if (ctrl & PAM_DEBUG_ARG) { + pam_syslog(pamh, LOG_DEBUG, "authentication %s", + (retval==PAM_SUCCESS) ? "succeeded" : "failed"); + } + + return retval; +} + +PAM_EXTERN int +pam_sm_setcred (pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_SUCCESS; +} + + +#ifdef PAM_STATIC + +/* static module data */ + +struct pam_module _pam_rootok_modstruct = { + "pam_rootok", + pam_sm_authenticate, + pam_sm_setcred, + NULL, + NULL, + NULL, + NULL, +}; + +#endif + +/* end of module definition */ diff --git a/modules/pam_rootok/tst-pam_rootok b/modules/pam_rootok/tst-pam_rootok new file mode 100755 index 00000000..385ef760 --- /dev/null +++ b/modules/pam_rootok/tst-pam_rootok @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_rootok.so diff --git a/modules/pam_securetty/Makefile.am b/modules/pam_securetty/Makefile.am new file mode 100644 index 00000000..dd8d9473 --- /dev/null +++ b/modules/pam_securetty/Makefile.am @@ -0,0 +1,30 @@ +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README $(MANS) $(XMLS) tst-pam_securetty + +TESTS = tst-pam_securetty + +man_MANS = pam_securetty.8 +XMLS = README.xml pam_securetty.8.xml + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_securetty.la +pam_securetty_la_LIBADD = -L$(top_builddir)/libpam -lpam + +if ENABLE_REGENERATE_MAN +noinst_DATA = README +README: pam_securetty.8.xml +-include $(top_srcdir)/Make.xml.rules +endif diff --git a/modules/pam_securetty/Makefile.in b/modules/pam_securetty/Makefile.in new file mode 100644 index 00000000..9d202b46 --- /dev/null +++ b/modules/pam_securetty/Makefile.in @@ -0,0 +1,667 @@ +# Makefile.in generated by automake 1.10.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 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uninstall-man uninstall-man8 \ + uninstall-securelibLTLIBRARIES + +@ENABLE_REGENERATE_MAN_TRUE@README: pam_securetty.8.xml +@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_securetty/README b/modules/pam_securetty/README new file mode 100644 index 00000000..d4ee5f97 --- /dev/null +++ b/modules/pam_securetty/README @@ -0,0 +1,33 @@ +pam_securetty — Limit root login to special devices + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +pam_securetty is a PAM module that allows root logins only if the user is +logging in on a "secure" tty, as defined by the listing in /etc/securetty. +pam_securetty also checks to make sure that /etc/securetty is a plain file and +not world writable. + +This module has no effect on non-root users and requires that the application +fills in the PAM_TTY item correctly. + +For canonical usage, should be listed as a required authentication method +before any sufficient authentication methods. + +OPTIONS + +debug + + Print debug information. + +EXAMPLES + +auth required pam_securetty.so +auth required pam_unix.so + + +AUTHOR + +pam_securetty was written by Elliot Lee <sopwith@cuc.edu>. + diff --git a/modules/pam_securetty/README.xml b/modules/pam_securetty/README.xml new file mode 100644 index 00000000..a8c098a0 --- /dev/null +++ b/modules/pam_securetty/README.xml @@ -0,0 +1,41 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_securetty.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_securetty.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_securetty-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_securetty.8.xml" xpointer='xpointer(//refsect1[@id = "pam_securetty-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_securetty.8.xml" xpointer='xpointer(//refsect1[@id = "pam_securetty-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_securetty.8.xml" xpointer='xpointer(//refsect1[@id = "pam_securetty-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_securetty.8.xml" xpointer='xpointer(//refsect1[@id = "pam_securetty-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_securetty/pam_securetty.8 b/modules/pam_securetty/pam_securetty.8 new file mode 100644 index 00000000..843ba406 --- /dev/null +++ b/modules/pam_securetty/pam_securetty.8 @@ -0,0 +1,97 @@ +.\" Title: pam_securetty +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_SECURETTY" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_securetty - Limit root login to special devices +.SH "SYNOPSIS" +.HP 17 +\fBpam_securetty\.so\fR [debug] +.SH "DESCRIPTION" +.PP +pam_securetty is a PAM module that allows root logins only if the user is logging in on a "secure" tty, as defined by the listing in +\fI/etc/securetty\fR\. pam_securetty also checks to make sure that +\fI/etc/securetty\fR +is a plain file and not world writable\. +.PP +This module has no effect on non\-root users and requires that the application fills in the +\fBPAM_TTY\fR +item correctly\. +.PP +For canonical usage, should be listed as a +\fBrequired\fR +authentication method before any +\fBsufficient\fR +authentication methods\. +.SH "OPTIONS" +.PP +\fBdebug\fR +.RS 4 +Print debug information\. +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +Only the +\fBauth\fR +service is supported\. +.SH "RETURN VALUES" +.PP +PAM_SUCCESS +.RS 4 +The user is allowed to continue authentication\. Either the user is not root, or the root user is trying to log in on an acceptable device\. +.RE +.PP +PAM_AUTH_ERR +.RS 4 +Authentication is rejected\. Either root is attempting to log in via an unacceptable device, or the +\fI/etc/securetty\fR +file is world writable or not a normal file\. +.RE +.PP +PAM_INCOMPLETE +.RS 4 +An application error occurred\. pam_securetty was not able to get information it required from the application that called it\. +.RE +.PP +PAM_SERVICE_ERR +.RS 4 +An error occurred while the module was determining the user\'s name or tty, or the module could not open +\fI/etc/securetty\fR\. +.RE +.PP +PAM_IGNORE +.RS 4 +The module could not find the user name in the +\fI/etc/passwd\fR +file to verify whether the user had a UID of 0\. Therefore, the results of running this module are ignored\. +.RE +.SH "EXAMPLES" +.PP + +.sp +.RS 4 +.nf +auth required pam_securetty\.so +auth required pam_unix\.so + +.fi +.RE +.sp +.SH "SEE ALSO" +.PP + +\fBsecuretty\fR(5), +\fBpam.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_securetty was written by Elliot Lee <sopwith@cuc\.edu>\. diff --git a/modules/pam_securetty/pam_securetty.8.xml b/modules/pam_securetty/pam_securetty.8.xml new file mode 100644 index 00000000..56348d78 --- /dev/null +++ b/modules/pam_securetty/pam_securetty.8.xml @@ -0,0 +1,167 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_securetty"> + + <refmeta> + <refentrytitle>pam_securetty</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_securetty-name"> + <refname>pam_securetty</refname> + <refpurpose>Limit root login to special devices</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_securetty-cmdsynopsis"> + <command>pam_securetty.so</command> + <arg choice="opt"> + debug + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_securetty-description"> + + <title>DESCRIPTION</title> + + <para> + pam_securetty is a PAM module that allows root logins only if the + user is logging in on a "secure" tty, as defined by the listing + in <filename>/etc/securetty</filename>. pam_securetty also checks + to make sure that <filename>/etc/securetty</filename> is a plain + file and not world writable. + </para> + <para> + This module has no effect on non-root users and requires that the + application fills in the <emphasis remap='B'>PAM_TTY</emphasis> + item correctly. + </para> + <para> + For canonical usage, should be listed as a + <emphasis remap='B'>required</emphasis> authentication method + before any <emphasis remap='B'>sufficient</emphasis> + authentication methods. + </para> + </refsect1> + + <refsect1 id="pam_securetty-options"> + <title>OPTIONS</title> + <variablelist> + <varlistentry> + <term> + <option>debug</option> + </term> + <listitem> + <para> + Print debug information. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_securetty-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + Only the <option>auth</option> service is supported. + </para> + </refsect1> + + <refsect1 id='pam_securetty-return_values'> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + The user is allowed to continue authentication. + Either the user is not root, or the root user is + trying to log in on an acceptable device. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_AUTH_ERR</term> + <listitem> + <para> + Authentication is rejected. Either root is attempting to + log in via an unacceptable device, or the + <filename>/etc/securetty</filename> file is world writable or + not a normal file. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_INCOMPLETE</term> + <listitem> + <para> + An application error occurred. pam_securetty was not able + to get information it required from the application that + called it. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_SERVICE_ERR</term> + <listitem> + <para> + An error occurred while the module was determining the + user's name or tty, or the module could not open + <filename>/etc/securetty</filename>. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_IGNORE</term> + <listitem> + <para> + The module could not find the user name in the + <filename>/etc/passwd</filename> file to verify whether + the user had a UID of 0. Therefore, the results of running + this module are ignored. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id='pam_securetty-examples'> + <title>EXAMPLES</title> + <para> + <programlisting> +auth required pam_securetty.so +auth required pam_unix.so + </programlisting> + </para> + </refsect1> + + <refsect1 id='pam_securetty-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>securetty</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_securetty-author'> + <title>AUTHOR</title> + <para> + pam_securetty was written by Elliot Lee <sopwith@cuc.edu>. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_securetty/pam_securetty.c b/modules/pam_securetty/pam_securetty.c new file mode 100644 index 00000000..9dbe9bc4 --- /dev/null +++ b/modules/pam_securetty/pam_securetty.c @@ -0,0 +1,219 @@ +/* pam_securetty module */ + +#define SECURETTY_FILE "/etc/securetty" +#define TTY_PREFIX "/dev/" + +/* + * by Elliot Lee <sopwith@redhat.com>, Red Hat Software. + * July 25, 1996. + * This code shamelessly ripped from the pam_rootok module. + * Slight modifications AGM. 1996/12/3 + */ + +#include "config.h" + +#include <stdio.h> +#include <stdlib.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <unistd.h> +#include <syslog.h> +#include <stdarg.h> +#include <pwd.h> +#include <string.h> +#include <ctype.h> + +/* + * here, we make a definition for the externally accessible function + * in this file (this definition is required for static a module + * but strongly encouraged generally) it is used to instruct the + * modules include file to define the function prototypes. + */ + +#define PAM_SM_AUTH +#define PAM_SM_ACCOUNT + +#include <security/pam_modules.h> +#include <security/pam_modutil.h> +#include <security/pam_ext.h> + +#define PAM_DEBUG_ARG 0x0001 + +static int +_pam_parse (const pam_handle_t *pamh, int argc, const char **argv) +{ + int ctrl=0; + + /* step through arguments */ + for (ctrl=0; argc-- > 0; ++argv) { + + /* generic options */ + + if (!strcmp(*argv,"debug")) + ctrl |= PAM_DEBUG_ARG; + else { + pam_syslog(pamh, LOG_ERR, "unknown option: %s", *argv); + } + } + + return ctrl; +} + +static int +securetty_perform_check (pam_handle_t *pamh, int ctrl, + const char *function_name) +{ + int retval = PAM_AUTH_ERR; + const char *username; + const char *uttyname; + const void *void_uttyname; + char ttyfileline[256]; + char ptname[256]; + struct stat ttyfileinfo; + struct passwd *user_pwd; + FILE *ttyfile; + + /* log a trail for debugging */ + if (ctrl & PAM_DEBUG_ARG) { + pam_syslog(pamh, LOG_DEBUG, "pam_securetty called via %s function", + function_name); + } + + retval = pam_get_user(pamh, &username, NULL); + if (retval != PAM_SUCCESS || username == NULL) { + pam_syslog(pamh, LOG_WARNING, "cannot determine username"); + return (retval == PAM_CONV_AGAIN ? PAM_INCOMPLETE:PAM_SERVICE_ERR); + } + + user_pwd = pam_modutil_getpwnam(pamh, username); + if (user_pwd == NULL) { + return PAM_USER_UNKNOWN; + } else if (user_pwd->pw_uid != 0) { /* If the user is not root, + securetty's does not apply + to them */ + return PAM_SUCCESS; + } + + retval = pam_get_item(pamh, PAM_TTY, &void_uttyname); + uttyname = void_uttyname; + if (retval != PAM_SUCCESS || uttyname == NULL) { + pam_syslog (pamh, LOG_WARNING, "cannot determine user's tty"); + return PAM_SERVICE_ERR; + } + + /* The PAM_TTY item may be prefixed with "/dev/" - skip that */ + if (strncmp(TTY_PREFIX, uttyname, sizeof(TTY_PREFIX)-1) == 0) { + uttyname += sizeof(TTY_PREFIX)-1; + } + + if (stat(SECURETTY_FILE, &ttyfileinfo)) { + pam_syslog(pamh, LOG_NOTICE, "Couldn't open %s: %m", SECURETTY_FILE); + return PAM_SUCCESS; /* for compatibility with old securetty handling, + this needs to succeed. But we still log the + error. */ + } + + if ((ttyfileinfo.st_mode & S_IWOTH) || !S_ISREG(ttyfileinfo.st_mode)) { + /* If the file is world writable or is not a + normal file, return error */ + pam_syslog(pamh, LOG_ERR, + "%s is either world writable or not a normal file", + SECURETTY_FILE); + return PAM_AUTH_ERR; + } + + ttyfile = fopen(SECURETTY_FILE,"r"); + if (ttyfile == NULL) { /* Check that we opened it successfully */ + pam_syslog(pamh, LOG_ERR, "Error opening %s: %m", SECURETTY_FILE); + return PAM_SERVICE_ERR; + } + + if (isdigit(uttyname[0])) { + snprintf(ptname, sizeof(ptname), "pts/%s", uttyname); + } else { + ptname[0] = '\0'; + } + + retval = 1; + + while ((fgets(ttyfileline, sizeof(ttyfileline)-1, ttyfile) != NULL) + && retval) { + if (ttyfileline[strlen(ttyfileline) - 1] == '\n') + ttyfileline[strlen(ttyfileline) - 1] = '\0'; + + retval = ( strcmp(ttyfileline, uttyname) + && (!ptname[0] || strcmp(ptname, uttyname)) ); + } + fclose(ttyfile); + + if (retval) { + pam_syslog(pamh, LOG_WARNING, "access denied: tty '%s' is not secure !", + uttyname); + + retval = PAM_AUTH_ERR; + } else { + if ((retval == PAM_SUCCESS) && (ctrl & PAM_DEBUG_ARG)) { + pam_syslog(pamh, LOG_DEBUG, "access allowed for '%s' on '%s'", + username, uttyname); + } + retval = PAM_SUCCESS; + + } + + return retval; +} + +/* --- authentication management functions --- */ + +PAM_EXTERN +int pam_sm_authenticate(pam_handle_t *pamh, int flags UNUSED, int argc, + const char **argv) +{ + int ctrl; + + /* parse the arguments */ + ctrl = _pam_parse (pamh, argc, argv); + + return securetty_perform_check(pamh, ctrl, __FUNCTION__); +} + +PAM_EXTERN int +pam_sm_setcred (pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_SUCCESS; +} + +/* --- account management functions --- */ + +PAM_EXTERN int +pam_sm_acct_mgmt (pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + int ctrl; + + /* parse the arguments */ + ctrl = _pam_parse (pamh, argc, argv); + + /* take the easy route */ + return securetty_perform_check(pamh, ctrl, __FUNCTION__); +} + + +#ifdef PAM_STATIC + +/* static module data */ + +struct pam_module _pam_securetty_modstruct = { + "pam_securetty", + pam_sm_authenticate, + pam_sm_setcred, + pam_sm_acct_mgmt, + NULL, + NULL, + NULL, +}; + +#endif /* PAM_STATIC */ + +/* end of module definition */ diff --git a/modules/pam_securetty/tst-pam_securetty b/modules/pam_securetty/tst-pam_securetty new file mode 100755 index 00000000..1252f798 --- /dev/null +++ b/modules/pam_securetty/tst-pam_securetty @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_securetty.so diff --git a/modules/pam_selinux/Makefile.am b/modules/pam_selinux/Makefile.am new file mode 100644 index 00000000..baf782a8 --- /dev/null +++ b/modules/pam_selinux/Makefile.am @@ -0,0 +1,43 @@ +# +# Copyright (c) 2005, 2006, 2007 Thorsten Kukuk <kukuk@thkukuk.de> +# + +CLEANFILES = *~ +MAINTAINERCLEANFILES = $(MANS) README + +EXTRA_DIST = README $(XMLS) pam_selinux.8 pam_selinux_check.8 \ + tst-pam_selinux + +if HAVE_LIBSELINUX + TESTS = tst-pam_selinux + man_MANS = pam_selinux.8 +endif + +XMLS = README.xml pam_selinux.8.xml + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include \ + -I$(top_srcdir)/libpam_misc/include + +pam_selinux_check_LDFLAGS = $(AM_LDFLAGS) \ + -L$(top_builddir)/libpam -lpam \ + -L$(top_builddir)/libpam_misc -lpam_misc + +pam_selinux_la_LIBADD = -L$(top_builddir)/libpam -lpam @LIBSELINUX@ +pam_selinux_la_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + pam_selinux_la_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +if HAVE_LIBSELINUX + securelib_LTLIBRARIES = pam_selinux.la + noinst_PROGRAMS = pam_selinux_check +endif +if ENABLE_REGENERATE_MAN +noinst_DATA = README pam_selinux.8 +README: pam_selinux.8.xml +-include $(top_srcdir)/Make.xml.rules +endif + diff --git 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uninstall-securelibLTLIBRARIES + +@ENABLE_REGENERATE_MAN_TRUE@README: pam_selinux.8.xml +@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_selinux/README b/modules/pam_selinux/README new file mode 100644 index 00000000..9e841f2e --- /dev/null +++ b/modules/pam_selinux/README @@ -0,0 +1,66 @@ +pam_selinux — PAM module to set the default security context + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +In a nutshell, pam_selinux sets up the default security context for the next +execed shell. + +When an application opens a session using pam_selinux, the shell that gets +executed will be run in the default security context, or if the user chooses +and the pam file allows the selected security context. Also the controlling tty +will have it's security context modified to match the users. + +Adding pam_selinux into a pam file could cause other pam modules to change +their behavior if the exec another application. The close and open option help +mitigate this problem. close option will only cause the close portion of the +pam_selinux to execute, and open will only cause the open portion to run. You +can add pam_selinux to the config file twice. Add the pam_selinux close as the +executes the open pass through the modules, pam_selinux open_session will +happen last. When PAM executes the close pass through the modules pam_selinux +close_session will happen first. + +OPTIONS + +close + + Only execute the close_session portion of the module. + +debug + + Turns on debugging via syslog(3). + +open + + Only execute the open_session portion of the module. + +nottys + + Do not try to setup the ttys security context. + +verbose + + attempt to inform the user when security context is set. + +select_context + + Attempt to ask the user for a custom security context role. If MLS is on + ask also for sensitivity level. + +use_current_range + + Use the sensitivity range of the process for the user context. This option + and the select_context option are mutually exclusive. + +EXAMPLES + +auth required pam_unix.so +session required pam_permit.so +session optional pam_selinux.so + + +AUTHOR + +pam_selinux was written by Dan Walsh <dwalsh@redhat.com>. + diff --git a/modules/pam_selinux/README.xml b/modules/pam_selinux/README.xml new file mode 100644 index 00000000..7e1baf55 --- /dev/null +++ b/modules/pam_selinux/README.xml @@ -0,0 +1,41 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_selinux.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_selinux.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_selinux-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_selinux.8.xml" xpointer='xpointer(//refsect1[@id = "pam_selinux-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_selinux.8.xml" xpointer='xpointer(//refsect1[@id = "pam_selinux-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_selinux.8.xml" xpointer='xpointer(//refsect1[@id = "pam_selinux-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_selinux.8.xml" xpointer='xpointer(//refsect1[@id = "pam_selinux-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_selinux/pam_selinux.8 b/modules/pam_selinux/pam_selinux.8 new file mode 100644 index 00000000..bfcf7ba7 --- /dev/null +++ b/modules/pam_selinux/pam_selinux.8 @@ -0,0 +1,101 @@ +.\" Title: pam_selinux +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_SELINUX" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_selinux - PAM module to set the default security context +.SH "SYNOPSIS" +.HP 15 +\fBpam_selinux\.so\fR [close] [debug] [open] [nottys] [verbose] [select_context] [use_current_range] +.SH "DESCRIPTION" +.PP +In a nutshell, pam_selinux sets up the default security context for the next execed shell\. +.PP +When an application opens a session using pam_selinux, the shell that gets executed will be run in the default security context, or if the user chooses and the pam file allows the selected security context\. Also the controlling tty will have it\'s security context modified to match the users\. +.PP +Adding pam_selinux into a pam file could cause other pam modules to change their behavior if the exec another application\. The close and open option help mitigate this problem\. close option will only cause the close portion of the pam_selinux to execute, and open will only cause the open portion to run\. You can add pam_selinux to the config file twice\. Add the pam_selinux close as the executes the open pass through the modules, pam_selinux open_session will happen last\. When PAM executes the close pass through the modules pam_selinux close_session will happen first\. +.SH "OPTIONS" +.PP +\fBclose\fR +.RS 4 +Only execute the close_session portion of the module\. +.RE +.PP +\fBdebug\fR +.RS 4 +Turns on debugging via +\fBsyslog\fR(3)\. +.RE +.PP +\fBopen\fR +.RS 4 +Only execute the open_session portion of the module\. +.RE +.PP +\fBnottys\fR +.RS 4 +Do not try to setup the ttys security context\. +.RE +.PP +\fBverbose\fR +.RS 4 +attempt to inform the user when security context is set\. +.RE +.PP +\fBselect_context\fR +.RS 4 +Attempt to ask the user for a custom security context role\. If MLS is on ask also for sensitivity level\. +.RE +.PP +\fBuse_current_range\fR +.RS 4 +Use the sensitivity range of the process for the user context\. This option and the select_context option are mutually exclusive\. +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +Only the +\fBsession\fR +service is supported\. +.SH "RETURN VALUES" +.PP +PAM_AUTH_ERR +.RS 4 +Unable to get or set a valid context\. +.RE +.PP +PAM_SUCCESS +.RS 4 +The security context was set successfull\. +.RE +.PP +PAM_USER_UNKNOWN +.RS 4 +The user is not known to the system\. +.RE +.SH "EXAMPLES" +.sp +.RS 4 +.nf +auth required pam_unix\.so +session required pam_permit\.so +session optional pam_selinux\.so + +.fi +.RE +.SH "SEE ALSO" +.PP + +\fBpam.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_selinux was written by Dan Walsh <dwalsh@redhat\.com>\. diff --git a/modules/pam_selinux/pam_selinux.8.xml b/modules/pam_selinux/pam_selinux.8.xml new file mode 100644 index 00000000..3acd1322 --- /dev/null +++ b/modules/pam_selinux/pam_selinux.8.xml @@ -0,0 +1,220 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_selinux"> + + <refmeta> + <refentrytitle>pam_selinux</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_selinux-name"> + <refname>pam_selinux</refname> + <refpurpose>PAM module to set the default security context</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_selinux-cmdsynopsis"> + <command>pam_selinux.so</command> + <arg choice="opt"> + close + </arg> + <arg choice="opt"> + debug + </arg> + <arg choice="opt"> + open + </arg> + <arg choice="opt"> + nottys + </arg> + <arg choice="opt"> + verbose + </arg> + <arg choice="opt"> + select_context + </arg> + <arg choice="opt"> + use_current_range + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_selinux-description"> + <title>DESCRIPTION</title> + <para> + In a nutshell, pam_selinux sets up the default security context for the + next execed shell. + </para> + <para> + When an application opens a session using pam_selinux, the shell that + gets executed will be run in the default security context, or if the + user chooses and the pam file allows the selected security context. + Also the controlling tty will have it's security context modified to + match the users. + </para> + <para> + Adding pam_selinux into a pam file could cause other pam modules to + change their behavior if the exec another application. The close and + open option help mitigate this problem. close option will only cause + the close portion of the pam_selinux to execute, and open will only + cause the open portion to run. You can add pam_selinux to the config + file twice. Add the pam_selinux close as the executes the open pass + through the modules, pam_selinux open_session will happen last. + When PAM executes the close pass through the modules pam_selinux + close_session will happen first. + </para> + </refsect1> + + <refsect1 id="pam_selinux-options"> + <title>OPTIONS</title> + <variablelist> + <varlistentry> + <term> + <option>close</option> + </term> + <listitem> + <para> + Only execute the close_session portion of the module. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>debug</option> + </term> + <listitem> + <para> + Turns on debugging via + <citerefentry> + <refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum> + </citerefentry>. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>open</option> + </term> + <listitem> + <para> + Only execute the open_session portion of the module. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>nottys</option> + </term> + <listitem> + <para> + Do not try to setup the ttys security context. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>verbose</option> + </term> + <listitem> + <para> + attempt to inform the user when security context is set. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>select_context</option> + </term> + <listitem> + <para> + Attempt to ask the user for a custom security context role. + If MLS is on ask also for sensitivity level. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>use_current_range</option> + </term> + <listitem> + <para> + Use the sensitivity range of the process for the user context. + This option and the select_context option are mutually exclusive. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_selinux-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + Only the <option>session</option> service is supported. + </para> + </refsect1> + + <refsect1 id='pam_selinux-return_values'> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_AUTH_ERR</term> + <listitem> + <para> + Unable to get or set a valid context. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + The security context was set successfull. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_USER_UNKNOWN</term> + <listitem> + <para> + The user is not known to the system. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id='pam_selinux-examples'> + <title>EXAMPLES</title> + <programlisting> +auth required pam_unix.so +session required pam_permit.so +session optional pam_selinux.so + </programlisting> + </refsect1> + + <refsect1 id='pam_selinux-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_selinux-author'> + <title>AUTHOR</title> + <para> + pam_selinux was written by Dan Walsh <dwalsh@redhat.com>. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_selinux/pam_selinux.c b/modules/pam_selinux/pam_selinux.c new file mode 100644 index 00000000..f679e33d --- /dev/null +++ b/modules/pam_selinux/pam_selinux.c @@ -0,0 +1,722 @@ +/****************************************************************************** + * A module for Linux-PAM that will set the default security context after login + * via PAM. + * + * Copyright (c) 2003 Red Hat, Inc. + * Written by Dan Walsh <dwalsh@redhat.com> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, and the entire permission notice in its entirety, + * including the disclaimer of warranties. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * ALTERNATIVELY, this product may be distributed under the terms of + * the GNU Public License, in which case the provisions of the GPL are + * required INSTEAD OF the above restrictions. (This clause is + * necessary due to a potential bad interaction between the GPL and + * the restrictions contained in a BSD-style copyright.) + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ + +#include "config.h" + +#include <errno.h> +#include <limits.h> +#include <pwd.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <syslog.h> + +#define PAM_SM_AUTH +#define PAM_SM_SESSION + +#include <security/pam_modules.h> +#include <security/_pam_macros.h> +#include <security/pam_modutil.h> +#include <security/pam_ext.h> + +#include <selinux/selinux.h> +#include <selinux/get_context_list.h> +#include <selinux/flask.h> +#include <selinux/av_permissions.h> +#include <selinux/selinux.h> +#include <selinux/context.h> +#include <selinux/get_default_type.h> + +#ifdef HAVE_LIBAUDIT +#include <libaudit.h> +#include <sys/select.h> +#include <errno.h> +#endif + +/* Send audit message */ +static + +int send_audit_message(pam_handle_t *pamh, int success, security_context_t default_context, + security_context_t selected_context) +{ + int rc=0; +#ifdef HAVE_LIBAUDIT + char *msg = NULL; + int audit_fd = audit_open(); + security_context_t default_raw=NULL; + security_context_t selected_raw=NULL; + rc = -1; + if (audit_fd < 0) { + if (errno == EINVAL || errno == EPROTONOSUPPORT || + errno == EAFNOSUPPORT) + return 0; /* No audit support in kernel */ + pam_syslog(pamh, LOG_ERR, "Error connecting to audit system."); + return rc; + } + if (selinux_trans_to_raw_context(default_context, &default_raw) < 0) { + pam_syslog(pamh, LOG_ERR, "Error translating default context."); + default_raw = NULL; + } + if (selinux_trans_to_raw_context(selected_context, &selected_raw) < 0) { + pam_syslog(pamh, LOG_ERR, "Error translating selected context."); + selected_raw = NULL; + } + if (asprintf(&msg, "pam: default-context=%s selected-context=%s", + default_raw ? default_raw : (default_context ? default_context : "?"), + selected_raw ? selected_raw : (selected_context ? selected_context : "?")) < 0) { + pam_syslog(pamh, LOG_ERR, "Error allocating memory."); + goto out; + } + if (audit_log_user_message(audit_fd, AUDIT_USER_ROLE_CHANGE, + msg, NULL, NULL, NULL, success) <= 0) { + pam_syslog(pamh, LOG_ERR, "Error sending audit message."); + goto out; + } + rc = 0; + out: + free(msg); + freecon(default_raw); + freecon(selected_raw); + close(audit_fd); +#else + pam_syslog(pamh, LOG_NOTICE, "pam: default-context=%s selected-context=%s success %d", default_context, selected_context, success); +#endif + return rc; +} +static int +send_text (pam_handle_t *pamh, const char *text, int debug) +{ + if (debug) + pam_syslog(pamh, LOG_NOTICE, "%s", text); + return pam_info (pamh, "%s", text); +} + +/* + * This function sends a message to the user and gets the response. The caller + * is responsible for freeing the responses. + */ +static int +query_response (pam_handle_t *pamh, const char *text, const char *def, + char **responses, int debug) +{ + int rc; + if (def) + rc = pam_prompt (pamh, PAM_PROMPT_ECHO_ON, responses, "%s [%s] ", text, def); + else + rc = pam_prompt (pamh, PAM_PROMPT_ECHO_ON, responses, "%s ", text); + if (debug) + pam_syslog(pamh, LOG_NOTICE, "%s %s", text, responses[0]); + return rc; +} + +static security_context_t +manual_context (pam_handle_t *pamh, const char *user, int debug) +{ + security_context_t newcon=NULL; + context_t new_context; + int mls_enabled = is_selinux_mls_enabled(); + char *type=NULL; + char *responses=NULL; + + while (1) { + query_response(pamh, + _("Would you like to enter a security context? [N] "), NULL, + &responses,debug); + if ((responses[0] == 'y') || (responses[0] == 'Y')) + { + if (mls_enabled) + new_context = context_new ("user:role:type:level"); + else + new_context = context_new ("user:role:type"); + + if (!new_context) + goto fail_set; + + if (context_user_set (new_context, user)) + goto fail_set; + + _pam_drop(responses); + /* Allow the user to enter each field of the context individually */ + query_response(pamh,_("role:"), NULL, &responses,debug); + if (responses[0] != '\0') { + if (context_role_set (new_context, responses)) + goto fail_set; + if (get_default_type(responses, &type)) + goto fail_set; + if (context_type_set (new_context, type)) + goto fail_set; + } + _pam_drop(responses); + if (mls_enabled) + { + query_response(pamh,_("level:"), NULL, &responses,debug); + if (responses[0] != '\0') { + if (context_range_set (new_context, responses)) + goto fail_set; + } + } + /* Get the string value of the context and see if it is valid. */ + if (!security_check_context(context_str(new_context))) { + newcon = strdup(context_str(new_context)); + context_free (new_context); + return newcon; + } + else + send_text(pamh,_("Not a valid security context"),debug); + context_free (new_context); + } + else { + _pam_drop(responses); + return NULL; + } + } /* end while */ + fail_set: + free(type); + _pam_drop(responses); + context_free (new_context); + return NULL; +} + +static int mls_range_allowed(pam_handle_t *pamh, security_context_t src, security_context_t dst, int debug) +{ + struct av_decision avd; + int retval; + unsigned int bit = CONTEXT__CONTAINS; + context_t src_context = context_new (src); + context_t dst_context = context_new (dst); + context_range_set(dst_context, context_range_get(src_context)); + if (debug) + pam_syslog(pamh, LOG_NOTICE, "Checking if %s mls range valid for %s", dst, context_str(dst_context)); + + retval = security_compute_av(context_str(dst_context), dst, SECCLASS_CONTEXT, bit, &avd); + context_free(src_context); + context_free(dst_context); + if (retval || ((bit & avd.allowed) != bit)) + return 0; + + return 1; +} + +static security_context_t +config_context (pam_handle_t *pamh, security_context_t puser_context, int debug) +{ + security_context_t newcon=NULL; + context_t new_context; + int mls_enabled = is_selinux_mls_enabled(); + char *responses=NULL; + char *type=NULL; + char resp_val = 0; + + pam_prompt (pamh, PAM_TEXT_INFO, NULL, _("Default Security Context %s\n"), puser_context); + + while (1) { + query_response(pamh, + _("Would you like to enter a different role or level?"), "n", + &responses,debug); + + resp_val = responses[0]; + _pam_drop(responses); + if ((resp_val == 'y') || (resp_val == 'Y')) + { + new_context = context_new(puser_context); + + /* Allow the user to enter role and level individually */ + query_response(pamh,_("role:"), context_role_get(new_context), + &responses, debug); + if (responses[0]) { + if (get_default_type(responses, &type)) { + pam_prompt (pamh, PAM_ERROR_MSG, NULL, _("No default type for role %s\n"), responses); + _pam_drop(responses); + continue; + } else { + if (context_role_set(new_context, responses)) + goto fail_set; + if (context_type_set (new_context, type)) + goto fail_set; + } + } + _pam_drop(responses); + if (mls_enabled) + { + query_response(pamh,_("level:"), context_range_get(new_context), + &responses, debug); + if (responses[0]) { + if (context_range_set(new_context, responses)) + goto fail_set; + } + _pam_drop(responses); + } + if (debug) + pam_syslog(pamh, LOG_NOTICE, "Selected Security Context %s", context_str(new_context)); + + /* Get the string value of the context and see if it is valid. */ + if (!security_check_context(context_str(new_context))) { + newcon = strdup(context_str(new_context)); + context_free (new_context); + + /* we have to check that this user is allowed to go into the + range they have specified ... role is tied to an seuser, so that'll + be checked at setexeccon time */ + if (mls_enabled && !mls_range_allowed(pamh, puser_context, newcon, debug)) { + pam_syslog(pamh, LOG_NOTICE, "Security context %s is not allowed for %s", puser_context, newcon); + + send_audit_message(pamh, 0, puser_context, newcon); + + free(newcon); + goto fail_range; + } + return newcon; + } + else { + send_audit_message(pamh, 0, puser_context, context_str(new_context)); + send_text(pamh,_("Not a valid security context"),debug); + } + context_free(new_context); /* next time around allocates another */ + } + else + return strdup(puser_context); + } /* end while */ + + return NULL; + + fail_set: + free(type); + _pam_drop(responses); + context_free (new_context); + send_audit_message(pamh, 0, puser_context, NULL); + fail_range: + return NULL; +} + +static void +security_restorelabel_tty(const pam_handle_t *pamh, + const char *tty, security_context_t context) +{ + char ttybuf[PATH_MAX]; + const char *ptr; + + if (context==NULL) + return; + + if(strncmp("/dev/", tty, 5)) { + snprintf(ttybuf,sizeof(ttybuf),"/dev/%s",tty); + ptr = ttybuf; + } + else + ptr = tty; + + if (setfilecon(ptr, context) && errno != ENOENT) + { + pam_syslog(pamh, LOG_NOTICE, + "Warning! Could not relabel %s with %s, not relabeling: %m", + ptr, context); + } +} + +static security_context_t +security_label_tty(pam_handle_t *pamh, char *tty, + security_context_t usercon) +{ + char ttybuf[PATH_MAX]; + int status=0; + security_context_t newdev_context=NULL; /* The new context of a device */ + security_context_t prev_context=NULL; /* The new context of a device */ + const char *ptr; + + if(strncmp("/dev/", tty, 5)) + { + snprintf(ttybuf,sizeof(ttybuf),"/dev/%s",tty); + ptr = ttybuf; + } + else + ptr = tty; + + if (getfilecon(ptr, &prev_context) < 0) + { + if(errno != ENOENT) + pam_syslog(pamh, LOG_NOTICE, + "Warning! Could not get current context for %s, not relabeling: %m", + ptr); + return NULL; + } + if( security_compute_relabel(usercon,prev_context,SECCLASS_CHR_FILE, + &newdev_context)!=0) + { + pam_syslog(pamh, LOG_NOTICE, + "Warning! Could not get new context for %s, not relabeling: %m", + ptr); + pam_syslog(pamh, LOG_NOTICE, + "usercon=%s, prev_context=%s", usercon, prev_context); + freecon(prev_context); + return NULL; + } + status=setfilecon(ptr,newdev_context); + if (status) + { + pam_syslog(pamh, LOG_NOTICE, + "Warning! Could not relabel %s with %s, not relabeling: %m", + ptr,newdev_context); + freecon(prev_context); + prev_context=NULL; + } + freecon(newdev_context); + return prev_context; +} + +static security_context_t user_context=NULL; +static security_context_t prev_user_context=NULL; +static security_context_t ttyn_context=NULL; /* The current context of ttyn device */ +static int selinux_enabled=0; +static char *ttyn=NULL; + +/* Tell the user that access has been granted. */ +static void +verbose_message(pam_handle_t *pamh, char *msg, int debug) +{ + if (debug) + pam_syslog(pamh, LOG_NOTICE, msg); + + pam_info (pamh, "%s", msg); +} + +PAM_EXTERN int +pam_sm_authenticate(pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + /* Fail by default. */ + return PAM_AUTH_ERR; +} + +PAM_EXTERN int +pam_sm_setcred(pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_SUCCESS; +} + +PAM_EXTERN int +pam_sm_open_session(pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + int i, debug = 0, ttys=1, has_tty=isatty(0); + int verbose=0, close_session=0; + int select_context = 0; + int use_current_range = 0; + int ret = 0; + security_context_t* contextlist = NULL; + int num_contexts = 0; + const char *username = NULL; + const void *tty = NULL; + char *seuser=NULL; + char *level=NULL; + security_context_t default_user_context=NULL; + + /* Parse arguments. */ + for (i = 0; i < argc; i++) { + if (strcmp(argv[i], "debug") == 0) { + debug = 1; + } + if (strcmp(argv[i], "nottys") == 0) { + ttys = 0; + } + if (strcmp(argv[i], "verbose") == 0) { + verbose = 1; + } + if (strcmp(argv[i], "close") == 0) { + close_session = 1; + } + if (strcmp(argv[i], "select_context") == 0) { + select_context = 1; + } + if (strcmp(argv[i], "use_current_range") == 0) { + use_current_range = 1; + } + } + + if (debug) + pam_syslog(pamh, LOG_NOTICE, "Open Session"); + + if (select_context && use_current_range) { + pam_syslog(pamh, LOG_ERR, "select_context cannot be used with use_current_range"); + select_context = 0; + } + + /* this module is only supposed to execute close_session */ + if (close_session) + return PAM_SUCCESS; + + if (!(selinux_enabled = is_selinux_enabled()>0) ) + return PAM_SUCCESS; + + if (pam_get_item(pamh, PAM_USER, (void *) &username) != PAM_SUCCESS || + username == NULL) { + return PAM_USER_UNKNOWN; + } + + if (getseuserbyname(username, &seuser, &level)==0) { + num_contexts = get_ordered_context_list_with_level(seuser, + level, + NULL, + &contextlist); + if (debug) + pam_syslog(pamh, LOG_DEBUG, "Username= %s SELinux User = %s Level= %s", + username, seuser, level); + free(seuser); + free(level); + } + if (num_contexts > 0) { + default_user_context=strdup(contextlist[0]); + freeconary(contextlist); + if (default_user_context == NULL) { + pam_syslog(pamh, LOG_ERR, "Out of memory"); + return PAM_AUTH_ERR; + } + user_context = default_user_context; + if (select_context && has_tty) { + user_context = config_context(pamh, default_user_context, debug); + if (user_context == NULL) { + freecon(default_user_context); + pam_syslog(pamh, LOG_ERR, "Unable to get valid context for %s", + username); + pam_prompt (pamh, PAM_ERROR_MSG, NULL, _("Unable to get valid context for %s"), username); + if (security_getenforce() == 1) + return PAM_AUTH_ERR; + else + return PAM_SUCCESS; + } + } + } + else { + if (has_tty) { + user_context = manual_context(pamh,seuser,debug); + if (user_context == NULL) { + pam_syslog (pamh, LOG_ERR, "Unable to get valid context for %s", + username); + if (security_getenforce() == 1) + return PAM_AUTH_ERR; + else + return PAM_SUCCESS; + } + } else { + pam_syslog (pamh, LOG_ERR, + "Unable to get valid context for %s, No valid tty", + username); + if (security_getenforce() == 1) + return PAM_AUTH_ERR; + else + return PAM_SUCCESS; + } + } + + if (use_current_range && is_selinux_mls_enabled()) { + security_context_t process_context=NULL; + if (getcon(&process_context) == 0) { + context_t pcon, ucon; + char *process_level=NULL; + security_context_t orig_context; + + if (user_context) + orig_context = user_context; + else + orig_context = default_user_context; + + pcon = context_new(process_context); + freecon(process_context); + process_level = strdup(context_range_get(pcon)); + context_free(pcon); + + if (debug) + pam_syslog (pamh, LOG_DEBUG, "process level=%s", process_level); + + ucon = context_new(orig_context); + + context_range_set(ucon, process_level); + free(process_level); + + if (!mls_range_allowed(pamh, orig_context, context_str(ucon), debug)) { + send_text(pamh, _("Requested MLS level not in permitted range"), debug); + /* even if default_user_context is NULL audit that anyway */ + send_audit_message(pamh, 0, default_user_context, context_str(ucon)); + context_free(ucon); + return PAM_AUTH_ERR; + } + + if (debug) + pam_syslog (pamh, LOG_DEBUG, "adjusted context=%s", context_str(ucon)); + + /* replace the user context with the level adjusted one */ + freecon(user_context); + user_context = strdup(context_str(ucon)); + + context_free(ucon); + } + } + + if (getexeccon(&prev_user_context)<0) { + prev_user_context=NULL; + } + if (ttys) { + /* Get the name of the terminal. */ + if (pam_get_item(pamh, PAM_TTY, &tty) != PAM_SUCCESS) { + tty = NULL; + } + + if ((tty == NULL) || (strlen(tty) == 0) || + strcmp(tty, "ssh") == 0 || strncmp(tty, "NODEV", 5) == 0) { + tty = ttyname(STDIN_FILENO); + if ((tty == NULL) || (strlen(tty) == 0)) { + tty = ttyname(STDOUT_FILENO); + } + if ((tty == NULL) || (strlen(tty) == 0)) { + tty = ttyname(STDERR_FILENO); + } + } + } + if(ttys && tty ) { + ttyn=strdup(tty); + ttyn_context=security_label_tty(pamh,ttyn,user_context); + } + send_audit_message(pamh, 1, default_user_context, user_context); + if (default_user_context != user_context) { + freecon(default_user_context); + } + ret = setexeccon(user_context); + if (ret==0 && verbose) { + char msg[PATH_MAX]; + snprintf(msg, sizeof(msg), + _("Security Context %s Assigned"), user_context); + verbose_message(pamh, msg, debug); + } + if (ret) { + pam_syslog(pamh, LOG_ERR, + "Error! Unable to set %s executable context %s.", + username, user_context); + if (security_getenforce() == 1) { + freecon(user_context); + return PAM_AUTH_ERR; + } + } else { + if (debug) + pam_syslog(pamh, LOG_NOTICE, "set %s security context to %s", + username, user_context); + } +#ifdef HAVE_SETKEYCREATECON + ret = setkeycreatecon(user_context); + if (ret==0 && verbose) { + char msg[PATH_MAX]; + snprintf(msg, sizeof(msg), + _("Key Creation Context %s Assigned"), user_context); + verbose_message(pamh, msg, debug); + } + if (ret) { + pam_syslog(pamh, LOG_ERR, + "Error! Unable to set %s key creation context %s.", + username, user_context); + if (security_getenforce() == 1) { + freecon(user_context); + return PAM_AUTH_ERR; + } + } else { + if (debug) + pam_syslog(pamh, LOG_NOTICE, "set %s key creation context to %s", + username, user_context); + } +#endif + freecon(user_context); + + return PAM_SUCCESS; +} + +PAM_EXTERN int +pam_sm_close_session(pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + int i, debug = 0, status = PAM_SUCCESS, open_session = 0; + if (! (selinux_enabled )) + return PAM_SUCCESS; + + /* Parse arguments. */ + for (i = 0; i < argc; i++) { + if (strcmp(argv[i], "debug") == 0) { + debug = 1; + } + if (strcmp(argv[i], "open") == 0) { + open_session = 1; + } + } + + if (debug) + pam_syslog(pamh, LOG_NOTICE, "Close Session"); + + if (open_session) + return PAM_SUCCESS; + + if (ttyn) { + if (debug) + pam_syslog(pamh, LOG_NOTICE, "Restore tty %s -> %s", + ttyn,ttyn_context); + + security_restorelabel_tty(pamh,ttyn,ttyn_context); + freecon(ttyn_context); + free(ttyn); + ttyn=NULL; + } + if (prev_user_context) { + if (setexeccon(prev_user_context)) { + pam_syslog(pamh, LOG_ERR, "Unable to restore executable context %s.", + prev_user_context); + if (security_getenforce() == 1) + status = PAM_AUTH_ERR; + else + status = PAM_SUCCESS; + } + freecon(prev_user_context); + prev_user_context = NULL; + } + + if (debug) + pam_syslog(pamh, LOG_NOTICE, "setcontext back to orginal"); + + return status; +} diff --git a/modules/pam_selinux/pam_selinux_check.8 b/modules/pam_selinux/pam_selinux_check.8 new file mode 100644 index 00000000..d6fcdff1 --- /dev/null +++ b/modules/pam_selinux/pam_selinux_check.8 @@ -0,0 +1,35 @@ +.TH pam_selinux_check 8 2002/05/23 "Red Hat Linux" "System Administrator's Manual" +.SH NAME +pam_selinux_check \- login program to test pam_selinux.so +.SH SYNOPSIS +.B pam_selinux_check [user] +.br + +.SH DESCRIPTION +With no arguments, +.B pam_selinux_check +will prompt for user + +.SH OPTIONS +.IP target_user +The user to login as. + +.SH DIAGNOSTICS +You must setup a /etc/pam.d/pam_selinux_check file, in order for the check to work. + +When checking if a selinux is valid, +.B pam_selinux_check +returns an exit code of 0 for success and > 0 on error: + +.nf +1: Authentication failure +.fi + +.SH SEE ALSO +pam_selinux(8) + +.SH BUGS +Let's hope not, but if you find any, please email the author. + +.SH AUTHOR +Dan Walsh <dwalsh@redhat.com> diff --git a/modules/pam_selinux/pam_selinux_check.c b/modules/pam_selinux/pam_selinux_check.c new file mode 100644 index 00000000..30526d37 --- /dev/null +++ b/modules/pam_selinux/pam_selinux_check.c @@ -0,0 +1,161 @@ +/****************************************************************************** + * A module for Linux-PAM that will set the default security context after login + * via PAM. + * + * Copyright (c) 2003 Red Hat, Inc. + * Written by Dan Walsh <dwalsh@redhat.com> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, and the entire permission notice in its entirety, + * including the disclaimer of warranties. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * ALTERNATIVELY, this product may be distributed under the terms of + * the GNU Public License, in which case the provisions of the GPL are + * required INSTEAD OF the above restrictions. (This clause is + * necessary due to a potential bad interaction between the GPL and + * the restrictions contained in a BSD-style copyright.) + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ + +/************************************************************************ + * + * All PAM code goes in this section. + * + ************************************************************************/ + +#include "config.h" + +#include <errno.h> +#include <syslog.h> +#include <unistd.h> /* for getuid(), exit(), getopt() */ +#include <signal.h> +#include <sys/wait.h> /* for wait() */ + +#include <security/pam_appl.h> /* for PAM functions */ +#include <security/pam_misc.h> /* for misc_conv PAM utility function */ + +#define SERVICE_NAME "pam_selinux_check" /* the name of this program for PAM */ + /* The file containing the context to run + * the scripts under. */ +int authenticate_via_pam( const char *user , pam_handle_t **pamh); + +/* authenticate_via_pam() + * + * in: user + * out: nothing + * return: value condition + * ----- --------- + * 1 pam thinks that the user authenticated themselves properly + * 0 otherwise + * + * this function uses pam to authenticate the user running this + * program. this is the only function in this program that makes pam + * calls. + * + */ + +int authenticate_via_pam( const char *user , pam_handle_t **pamh) { + + struct pam_conv *conv; + int result = 0; /* our result, set to 0 (not authenticated) by default */ + + /* this is a jump table of functions for pam to use when it wants to * + * communicate with the user. we'll be using misc_conv(), which is * + * provided for us via pam_misc.h. */ + struct pam_conv pam_conversation = { + misc_conv, + NULL + }; + conv = &pam_conversation; + + + /* make `p_pam_handle' a valid pam handle so we can use it when * + * calling pam functions. */ + if( PAM_SUCCESS != pam_start( SERVICE_NAME, + user, + conv, + pamh ) ) { + fprintf( stderr, _("failed to initialize PAM\n") ); + exit( -1 ); + } + + if( PAM_SUCCESS != pam_set_item(*pamh, PAM_RUSER, user)) + { + fprintf( stderr, _("failed to pam_set_item()\n") ); + exit( -1 ); + } + + /* Ask PAM to authenticate the user running this program */ + if( PAM_SUCCESS == pam_authenticate(*pamh,0) ) { + if ( PAM_SUCCESS == pam_open_session(*pamh, 0) ) + result = 1; /* user authenticated OK! */ + } + return( result ); + +} /* authenticate_via_pam() */ + +int +main (int argc, char **argv) +{ + pam_handle_t *pamh; + int childPid; + + if (argc < 1) + exit (-1); + + if (!authenticate_via_pam(argv[1],&pamh)) + exit(-1); + + childPid = fork(); + if (childPid < 0) { + /* error in fork() */ + fprintf(stderr, _("login: failure forking: %m")); + pam_close_session(pamh, 0); + /* We're done with PAM. Free `pam_handle'. */ + pam_end( pamh, PAM_SUCCESS ); + exit(0); + } + if (childPid) { + close(0); close(1); close(2); + struct sigaction sa; + memset(&sa,0,sizeof(sa)); + sa.sa_handler = SIG_IGN; + sigaction(SIGQUIT, &sa, NULL); + sigaction(SIGINT, &sa, NULL); + while(wait(NULL) == -1 && errno == EINTR) /**/ ; + openlog("login", LOG_ODELAY, LOG_AUTHPRIV); + pam_close_session(pamh, 0); + /* We're done with PAM. Free `pam_handle'. */ + pam_end( pamh, PAM_SUCCESS ); + exit(0); + } + argv[0]=strdup ("/bin/sh"); + argv[1]=NULL; + + /* NOTE: The environment has not been sanitized. LD_PRELOAD and other fun + * things could be set. */ + execv("/bin/sh",argv); + fprintf(stderr,"Failure\n"); + return 0; +} diff --git a/modules/pam_selinux/tst-pam_selinux b/modules/pam_selinux/tst-pam_selinux new file mode 100755 index 00000000..14c3d82f --- /dev/null +++ b/modules/pam_selinux/tst-pam_selinux @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_selinux.so diff --git a/modules/pam_sepermit/Makefile.am b/modules/pam_sepermit/Makefile.am new file mode 100644 index 00000000..579e142f --- /dev/null +++ b/modules/pam_sepermit/Makefile.am @@ -0,0 +1,43 @@ +# +# Copyright (c) 2005, 2006, 2007 Thorsten Kukuk <kukuk@thkukuk.de> +# Copyright (c) 2008 Red Hat, Inc. +# + +CLEANFILES = *~ +MAINTAINERCLEANFILES = $(MANS) README + +EXTRA_DIST = README $(XMLS) pam_sepermit.8 sepermit.conf tst-pam_sepermit + +if HAVE_LIBSELINUX + TESTS = tst-pam_sepermit + man_MANS = pam_sepermit.8 +endif + +XMLS = README.xml pam_sepermit.8.xml + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) +sepermitlockdir = ${localstatedir}/run/sepermit + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include \ + -I$(top_srcdir)/libpam_misc/include \ + -D SEPERMIT_CONF_FILE=\"$(SCONFIGDIR)/sepermit.conf\" \ + -D SEPERMIT_LOCKDIR=\"$(sepermitlockdir)\" + +pam_sepermit_la_LIBADD = -L$(top_builddir)/libpam -lpam @LIBSELINUX@ +pam_sepermit_la_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + pam_sepermit_la_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +if HAVE_LIBSELINUX + secureconf_DATA = sepermit.conf + sepermitlock_DATA = + + securelib_LTLIBRARIES = pam_sepermit.la +endif +if ENABLE_REGENERATE_MAN +noinst_DATA = README pam_sepermit.8 +README: pam_sepermit.8.xml +-include $(top_srcdir)/Make.xml.rules +endif diff --git a/modules/pam_sepermit/Makefile.in b/modules/pam_sepermit/Makefile.in new file mode 100644 index 00000000..fa5b9d64 --- /dev/null +++ b/modules/pam_sepermit/Makefile.in @@ -0,0 +1,723 @@ +# 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clean-securelibLTLIBRARIES ctags \ + distclean distclean-compile distclean-generic \ + distclean-libtool distclean-tags distdir dvi dvi-am html \ + html-am info info-am install install-am install-data \ + install-data-am install-dvi install-dvi-am install-exec \ + install-exec-am install-html install-html-am install-info \ + install-info-am install-man install-man8 install-pdf \ + install-pdf-am install-ps install-ps-am install-secureconfDATA \ + install-securelibLTLIBRARIES install-sepermitlockDATA \ + install-strip installcheck installcheck-am installdirs \ + maintainer-clean maintainer-clean-generic mostlyclean \ + mostlyclean-compile mostlyclean-generic mostlyclean-libtool \ + pdf pdf-am ps ps-am tags uninstall uninstall-am uninstall-man \ + uninstall-man8 uninstall-secureconfDATA \ + uninstall-securelibLTLIBRARIES uninstall-sepermitlockDATA + +@ENABLE_REGENERATE_MAN_TRUE@README: pam_sepermit.8.xml +@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_sepermit/README b/modules/pam_sepermit/README new file mode 100644 index 00000000..11429832 --- /dev/null +++ b/modules/pam_sepermit/README @@ -0,0 +1,51 @@ +pam_sepermit — PAM module to allow/deny login depending on SELinux enforcement +state + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +The pam_sepermit module allows or denies login depending on SELinux enforcement +state. + +When the user which is logging in matches an entry in the config file he is +allowed access only when the SELinux is in enforcing mode. Otherwise he is +denied access. For users not matching any entry in the config file the +pam_sepermit module returns PAM_IGNORE return value. + +The config file contains a simple list of user names one per line. If the name +is prefixed with @ character it means that all users in the group name match. +If it is prefixed with a % character the SELinux user is used to match against +the name instead of the account name. Note that when SELinux is disabled the +SELinux user assigned to the account cannot be determined. This means that such +entries are never matched when SELinux is disabled and pam_sepermit will return +PAM_IGNORE. + +Each user name in the configuration file can have optional arguments separated +by : character. The only currently recognized argument is exclusive. The +pam_sepermit module will allow only single concurrent user session for the user +with this argument specified and it will attempt to kill all processes of the +user after logout. + +OPTIONS + +debug + + Turns on debugging via syslog(3). + +conf=/path/to/config/file + + Path to alternative config file overriding the default. + +EXAMPLES + +auth [success=done ignore=ignore default=bad] pam_sepermit.so +auth required pam_unix.so +account required pam_unix.so +session required pam_permit.so + + +AUTHOR + +pam_sepermit was written by Tomas Mraz <tmraz@redhat.com>. + diff --git a/modules/pam_sepermit/README.xml b/modules/pam_sepermit/README.xml new file mode 100644 index 00000000..bb65951c --- /dev/null +++ b/modules/pam_sepermit/README.xml @@ -0,0 +1,41 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_sepermit.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_sepermit.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_sepermit-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_sepermit.8.xml" xpointer='xpointer(//refsect1[@id = "pam_sepermit-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_sepermit.8.xml" xpointer='xpointer(//refsect1[@id = "pam_sepermit-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_sepermit.8.xml" xpointer='xpointer(//refsect1[@id = "pam_sepermit-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_sepermit.8.xml" xpointer='xpointer(//refsect1[@id = "pam_sepermit-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_sepermit/pam_sepermit.8 b/modules/pam_sepermit/pam_sepermit.8 new file mode 100644 index 00000000..40486668 --- /dev/null +++ b/modules/pam_sepermit/pam_sepermit.8 @@ -0,0 +1,110 @@ +.\" Title: pam_sepermit +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_SEPERMIT" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_sepermit - PAM module to allow/deny login depending on SELinux enforcement state +.SH "SYNOPSIS" +.HP 16 +\fBpam_sepermit\.so\fR [debug] [conf=\fI/path/to/config/file\fR] +.SH "DESCRIPTION" +.PP +The pam_sepermit module allows or denies login depending on SELinux enforcement state\. +.PP +When the user which is logging in matches an entry in the config file he is allowed access only when the SELinux is in enforcing mode\. Otherwise he is denied access\. For users not matching any entry in the config file the pam_sepermit module returns PAM_IGNORE return value\. +.PP +The config file contains a simple list of user names one per line\. If the +\fIname\fR +is prefixed with +\fI@\fR +character it means that all users in the group +\fIname\fR +match\. If it is prefixed with a +\fI%\fR +character the SELinux user is used to match against the +\fIname\fR +instead of the account name\. Note that when SELinux is disabled the SELinux user assigned to the account cannot be determined\. This means that such entries are never matched when SELinux is disabled and pam_sepermit will return PAM_IGNORE\. +.PP +Each user name in the configuration file can have optional arguments separated by +\fI:\fR +character\. The only currently recognized argument is +\fIexclusive\fR\. The pam_sepermit module will allow only single concurrent user session for the user with this argument specified and it will attempt to kill all processes of the user after logout\. +.SH "OPTIONS" +.PP +\fBdebug\fR +.RS 4 +Turns on debugging via +\fBsyslog\fR(3)\. +.RE +.PP +\fBconf=\fR\fB\fI/path/to/config/file\fR\fR +.RS 4 +Path to alternative config file overriding the default\. +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +Only the +\fBauth\fR +and +\fBaccount\fR +services are supported\. +.SH "RETURN VALUES" +.PP +PAM_AUTH_ERR +.RS 4 +SELinux is disabled or in the permissive mode and the user matches\. +.RE +.PP +PAM_SUCCESS +.RS 4 +SELinux is in the enforcing mode and the user matches\. +.RE +.PP +PAM_IGNORE +.RS 4 +The user does not match any entry in the config file\. +.RE +.PP +PAM_USER_UNKNOWN +.RS 4 +The module was unable to determine the user\'s name\. +.RE +.PP +PAM_SERVICE_ERR +.RS 4 +Error during reading or parsing the config file\. +.RE +.SH "FILES" +.PP +\fI/etc/security/sepermit\.conf\fR +.RS 4 +Default configuration file +.RE +.SH "EXAMPLES" +.sp +.RS 4 +.nf +auth [success=done ignore=ignore default=bad] pam_sepermit\.so +auth required pam_unix\.so +account required pam_unix\.so +session required pam_permit\.so + +.fi +.RE +.SH "SEE ALSO" +.PP + +\fBpam.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_sepermit was written by Tomas Mraz <tmraz@redhat\.com>\. diff --git a/modules/pam_sepermit/pam_sepermit.8.xml b/modules/pam_sepermit/pam_sepermit.8.xml new file mode 100644 index 00000000..c2546b62 --- /dev/null +++ b/modules/pam_sepermit/pam_sepermit.8.xml @@ -0,0 +1,189 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_sepermit"> + + <refmeta> + <refentrytitle>pam_sepermit</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_sepermit-name"> + <refname>pam_sepermit</refname> + <refpurpose>PAM module to allow/deny login depending on SELinux enforcement state</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_sepermit-cmdsynopsis"> + <command>pam_sepermit.so</command> + <arg choice="opt"> + debug + </arg> + <arg choice="opt"> + conf=<replaceable>/path/to/config/file</replaceable> + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_sepermit-description"> + <title>DESCRIPTION</title> + <para> + The pam_sepermit module allows or denies login depending on SELinux + enforcement state. + </para> + <para> + When the user which is logging in matches an entry in the config file + he is allowed access only when the SELinux is in enforcing mode. Otherwise + he is denied access. For users not matching any entry in the config file + the pam_sepermit module returns PAM_IGNORE return value. + </para> + <para> + The config file contains a simple list of user names one per line. If the + <replaceable>name</replaceable> is prefixed with <emphasis>@</emphasis> character it means that all + users in the group <replaceable>name</replaceable> match. If it is prefixed + with a <emphasis>%</emphasis> character the SELinux user is used to match against the <replaceable>name</replaceable> + instead of the account name. Note that when SELinux is disabled the + SELinux user assigned to the account cannot be determined. This means that + such entries are never matched when SELinux is disabled and pam_sepermit + will return PAM_IGNORE. + </para> + <para> + Each user name in the configuration file can have optional arguments separated + by <emphasis>:</emphasis> character. The only currently recognized argument is <emphasis>exclusive</emphasis>. + The pam_sepermit module will allow only single concurrent user session for + the user with this argument specified and it will attempt to kill all processes + of the user after logout. + </para> + </refsect1> + + <refsect1 id="pam_sepermit-options"> + <title>OPTIONS</title> + <variablelist> + <varlistentry> + <term> + <option>debug</option> + </term> + <listitem> + <para> + Turns on debugging via + <citerefentry> + <refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum> + </citerefentry>. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>conf=<replaceable>/path/to/config/file</replaceable></option> + </term> + <listitem> + <para> + Path to alternative config file overriding the default. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_sepermit-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + Only the <option>auth</option> and <option>account</option> + services are supported. + </para> + </refsect1> + + <refsect1 id='pam_sepermit-return_values'> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_AUTH_ERR</term> + <listitem> + <para> + SELinux is disabled or in the permissive mode and the user + matches. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + SELinux is in the enforcing mode and the user matches. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_IGNORE</term> + <listitem> + <para> + The user does not match any entry in the config file. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_USER_UNKNOWN</term> + <listitem> + <para> + The module was unable to determine the user's name. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_SERVICE_ERR</term> + <listitem> + <para> + Error during reading or parsing the config file. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_sepermit-files"> + <title>FILES</title> + <variablelist> + <varlistentry> + <term><filename>/etc/security/sepermit.conf</filename></term> + <listitem> + <para>Default configuration file</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id='pam_sepermit-examples'> + <title>EXAMPLES</title> + <programlisting> +auth [success=done ignore=ignore default=bad] pam_sepermit.so +auth required pam_unix.so +account required pam_unix.so +session required pam_permit.so + </programlisting> + </refsect1> + + <refsect1 id='pam_sepermit-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_sepermit-author'> + <title>AUTHOR</title> + <para> + pam_sepermit was written by Tomas Mraz <tmraz@redhat.com>. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_sepermit/pam_sepermit.c b/modules/pam_sepermit/pam_sepermit.c new file mode 100644 index 00000000..0d5ab21a --- /dev/null +++ b/modules/pam_sepermit/pam_sepermit.c @@ -0,0 +1,408 @@ +/****************************************************************************** + * A module for Linux-PAM that allows/denies acces based on SELinux state. + * + * Copyright (c) 2007, 2008 Red Hat, Inc. + * Originally written by Tomas Mraz <tmraz@redhat.com> + * Contributions by Dan Walsh <dwalsh@redhat.com> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, and the entire permission notice in its entirety, + * including the disclaimer of warranties. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * ALTERNATIVELY, this product may be distributed under the terms of + * the GNU Public License, in which case the provisions of the GPL are + * required INSTEAD OF the above restrictions. (This clause is + * necessary due to a potential bad interaction between the GPL and + * the restrictions contained in a BSD-style copyright.) + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ + +#include "config.h" + +#include <errno.h> +#include <pwd.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <syslog.h> +#include <ctype.h> +#include <signal.h> +#include <limits.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <unistd.h> +#include <pwd.h> +#include <dirent.h> + +#define PAM_SM_AUTH +#define PAM_SM_ACCOUNT + +#include <security/pam_modules.h> +#include <security/_pam_macros.h> +#include <security/pam_modutil.h> +#include <security/pam_ext.h> + +#include <selinux/selinux.h> + +#define MODULE "pam_sepermit" +#define OPT_DELIM ":" + +struct lockfd { + uid_t uid; + int fd; + int debug; +}; + +#define PROC_BASE "/proc" +#define MAX_NAMES (int)(sizeof(unsigned long)*8) + +static int +match_process_uid(pid_t pid, uid_t uid) +{ + char buf[128]; + uid_t puid; + FILE *f; + int re = 0; + + snprintf (buf, sizeof buf, PROC_BASE "/%d/status", pid); + if (!(f = fopen (buf, "r"))) + return 0; + + while (fgets(buf, sizeof buf, f)) { + if (sscanf (buf, "Uid:\t%d", &puid)) { + re = uid == puid; + break; + } + } + fclose(f); + return re; +} + +static int +check_running (pam_handle_t *pamh, uid_t uid, int killall, int debug) +{ + DIR *dir; + struct dirent *de; + pid_t *pid_table, pid, self; + int i; + int pids, max_pids; + int running = 0; + self = getpid(); + if (!(dir = opendir(PROC_BASE))) { + pam_syslog(pamh, LOG_ERR, "Failed to open proc directory file %s:", PROC_BASE); + return -1; + } + max_pids = 256; + pid_table = malloc(max_pids * sizeof (pid_t)); + if (!pid_table) { + pam_syslog(pamh, LOG_CRIT, "Memory allocation error"); + return -1; + } + pids = 0; + while ((de = readdir (dir)) != NULL) { + if (!(pid = (pid_t)atoi(de->d_name)) || pid == self) + continue; + + if (pids == max_pids) { + if (!(pid_table = realloc(pid_table, 2*pids*sizeof(pid_t)))) { + pam_syslog(pamh, LOG_CRIT, "Memory allocation error"); + return -1; + } + max_pids *= 2; + } + pid_table[pids++] = pid; + } + + (void)closedir(dir); + + for (i = 0; i < pids; i++) { + pid_t id; + + if (match_process_uid(pid_table[i], uid) == 0) + continue; + id = pid_table[i]; + + if (killall) { + if (debug) + pam_syslog(pamh, LOG_NOTICE, "Attempting to kill %d", id); + kill(id, SIGKILL); + } + running++; + } + + free(pid_table); + return running; +} + +static void +sepermit_unlock(pam_handle_t *pamh, void *plockfd, int error_status UNUSED) +{ + struct lockfd *lockfd = plockfd; + struct flock fl; + + memset(&fl, 0, sizeof(fl)); + fl.l_type = F_UNLCK; + fl.l_whence = SEEK_SET; + + if (lockfd->debug) + pam_syslog(pamh, LOG_ERR, "Unlocking fd: %d uid: %d", lockfd->fd, lockfd->uid); + + /* Don't kill uid==0 */ + if (lockfd->uid) + /* This is a DOS but it prevents an app from forking to prevent killing */ + while(check_running(pamh, lockfd->uid, 1, lockfd->debug) > 0) + continue; + + fcntl(lockfd->fd, F_SETLK, &fl); + close(lockfd->fd); + free(lockfd); +} + +static int +sepermit_lock(pam_handle_t *pamh, const char *user, int debug) +{ + char buf[PATH_MAX]; + struct flock fl; + + memset(&fl, 0, sizeof(fl)); + fl.l_type = F_WRLCK; + fl.l_whence = SEEK_SET; + + struct passwd *pw = pam_modutil_getpwnam( pamh, user ); + if (!pw) { + pam_syslog(pamh, LOG_ERR, "Unable to find uid for user %s", user); + return -1; + } + if (check_running(pamh, pw->pw_uid, 0, debug) > 0) { + pam_syslog(pamh, LOG_ERR, "User %s processes are running. Exclusive login not allowed", user); + return -1; + } + + snprintf(buf, sizeof(buf), "%s/%d.lock", SEPERMIT_LOCKDIR, pw->pw_uid); + int fd = open(buf, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR); + if (fd < 0) { + pam_syslog(pamh, LOG_ERR, "Unable to open lock file %s/%d.lock", SEPERMIT_LOCKDIR, pw->pw_uid); + return -1; + } + + /* Need to close on exec */ + fcntl(fd, F_SETFD, FD_CLOEXEC); + + if (fcntl(fd, F_SETLK, &fl) == -1) { + pam_syslog(pamh, LOG_ERR, "User %s with exclusive login already logged in", user); + close(fd); + return -1; + } + struct lockfd *lockfd=calloc(1, sizeof(struct lockfd)); + if (!lockfd) { + close(fd); + pam_syslog(pamh, LOG_CRIT, "Memory allocation error"); + return -1; + } + lockfd->uid = pw->pw_uid; + lockfd->debug = debug; + lockfd->fd=fd; + pam_set_data(pamh, MODULE, lockfd, sepermit_unlock); + return 0; +} + +/* return 0 when matched, -1 when unmatched, pam error otherwise */ +static int +sepermit_match(pam_handle_t *pamh, const char *cfgfile, const char *user, + const char *seuser, int debug) +{ + FILE *f; + char *line = NULL; + char *start; + size_t len = 0; + int matched = 0; + int exclusive = 0; + + f = fopen(cfgfile, "r"); + + if (!f) { + pam_syslog(pamh, LOG_ERR, "Failed to open config file %s: %m", cfgfile); + return PAM_SERVICE_ERR; + } + + while (!matched && getline(&line, &len, f) != -1) { + size_t n; + char *sptr; + char *opt; + + if (line[0] == '#') + continue; + + start = line; + while (isspace(*start)) + ++start; + n = strlen(start); + while (n > 0 && isspace(start[n-1])) { + --n; + } + if (n == 0) + continue; + + start[n] = '\0'; + start = strtok_r(start, OPT_DELIM, &sptr); + + switch (start[0]) { + case '@': + ++start; + if (debug) + pam_syslog(pamh, LOG_NOTICE, "Matching user %s against group %s", user, start); + if (pam_modutil_user_in_group_nam_nam(pamh, user, start)) { + matched = 1; + } + break; + case '%': + ++start; + if (debug) + pam_syslog(pamh, LOG_NOTICE, "Matching seuser %s against seuser %s", seuser, start); + if (strcmp(seuser, start) == 0) { + matched = 1; + } + break; + default: + if (debug) + pam_syslog(pamh, LOG_NOTICE, "Matching user %s against user %s", user, start); + if (strcmp(user, start) == 0) { + matched = 1; + } + } + if (matched) + while ((opt=strtok_r(NULL, OPT_DELIM, &sptr)) != NULL) { + if (strcmp(opt, "exclusive") == 0) + exclusive = 1; + else if (debug) { + pam_syslog(pamh, LOG_NOTICE, "Unknown user option: %s", opt); + } + } + } + + free(line); + fclose(f); + if (matched) + return exclusive ? sepermit_lock(pamh, user, debug) : 0; + else + return -1; +} + +PAM_EXTERN int +pam_sm_authenticate(pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + int i; + int rv; + int debug = 0; + int sense = PAM_AUTH_ERR; + const char *user = NULL; + char *seuser = NULL; + char *level = NULL; + const char *cfgfile = SEPERMIT_CONF_FILE; + + /* Parse arguments. */ + for (i = 0; i < argc; i++) { + if (strcmp(argv[i], "debug") == 0) { + debug = 1; + } + if (strcmp(argv[i], "conf=") == 0) { + cfgfile = argv[i] + 5; + } + } + + if (debug) + pam_syslog(pamh, LOG_NOTICE, "Parsing config file: %s", cfgfile); + + if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS || user == NULL + || *user == '\0') { + pam_syslog(pamh, LOG_ERR, "Cannot determine the user's name"); + return PAM_USER_UNKNOWN; + } + + if (is_selinux_enabled() > 0) { + if (security_getenforce() == 1) { + if (debug) + pam_syslog(pamh, LOG_NOTICE, "Enforcing mode, access will be allowed on match"); + sense = PAM_SUCCESS; + } + + if (getseuserbyname(user, &seuser, &level) != 0) { + seuser = NULL; + level = NULL; + pam_syslog(pamh, LOG_ERR, "getseuserbyname failed: %m"); + } + } + + if (debug && sense != PAM_SUCCESS) + pam_syslog(pamh, LOG_NOTICE, "Access will not be allowed on match"); + + rv = sepermit_match(pamh, cfgfile, user, seuser, debug); + + if (debug) + pam_syslog(pamh, LOG_NOTICE, "sepermit_match returned: %d", rv); + + free(seuser); + free(level); + + switch (rv) { + case -1: + return PAM_IGNORE; + case 0: + return sense; + } + + return rv; +} + +PAM_EXTERN int +pam_sm_setcred (pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_IGNORE; +} + +PAM_EXTERN int +pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, + int argc, const char **argv) +{ + return pam_sm_authenticate(pamh, flags, argc, argv); +} + +#ifdef PAM_STATIC + +/* static module data */ + +struct pam_module _pam_sepermit_modstruct = { + "pam_sepermit", + pam_sm_authenticate, + pam_sm_setcred, + pam_sm_acct_mgmt, + NULL, + NULL, + NULL +}; +#endif + diff --git a/modules/pam_sepermit/sepermit.conf b/modules/pam_sepermit/sepermit.conf new file mode 100644 index 00000000..951f3dfe --- /dev/null +++ b/modules/pam_sepermit/sepermit.conf @@ -0,0 +1,11 @@ +# /etc/security/sepermit.conf +# +# Each line contains either: +# - an user name +# - a group name, with @group syntax +# - a SELinux user name, with %seuser syntax +# Each line can contain optional arguments separated by : +# The possible arguments are: +# - exclusive - only single login session will +# be allowed for the user and the user's processes +# will be killed on logout diff --git a/modules/pam_sepermit/tst-pam_sepermit b/modules/pam_sepermit/tst-pam_sepermit new file mode 100755 index 00000000..6e6d2363 --- /dev/null +++ b/modules/pam_sepermit/tst-pam_sepermit @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_sepermit.so diff --git a/modules/pam_shells/Makefile.am b/modules/pam_shells/Makefile.am new file mode 100644 index 00000000..543e01b4 --- /dev/null +++ b/modules/pam_shells/Makefile.am @@ -0,0 +1,31 @@ +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README $(MANS) $(XMLS) tst-pam_shells + +man_MANS = pam_shells.8 +XMLS = README.xml pam_shells.8.xml + +TESTS = tst-pam_shells + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_shells.la +pam_shells_la_LIBADD = -L$(top_builddir)/libpam -lpam + +if ENABLE_REGENERATE_MAN +noinst_DATA = README +README: pam_shells.8.xml +-include $(top_srcdir)/Make.xml.rules +endif + diff --git a/modules/pam_shells/Makefile.in b/modules/pam_shells/Makefile.in new file mode 100644 index 00000000..6068cb6d --- /dev/null +++ b/modules/pam_shells/Makefile.in @@ -0,0 +1,667 @@ +# Makefile.in generated by automake 1.10.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY, to the extent permitted by law; without +# even the implied warranty of MERCHANTABILITY or FITNESS FOR A +# PARTICULAR PURPOSE. + +@SET_MAKE@ + +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + + +VPATH = @srcdir@ +pkgdatadir = $(datadir)/@PACKAGE@ +pkglibdir = $(libdir)/@PACKAGE@ +pkgincludedir = $(includedir)/@PACKAGE@ +am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd +install_sh_DATA = $(install_sh) -c -m 644 +install_sh_PROGRAM = $(install_sh) -c +install_sh_SCRIPT = $(install_sh) -c +INSTALL_HEADER = $(INSTALL_DATA) +transform = $(program_transform_name) +NORMAL_INSTALL = : +PRE_INSTALL = : +POST_INSTALL = : +NORMAL_UNINSTALL = : +PRE_UNINSTALL = : +POST_UNINSTALL = : +build_triplet = @build@ +host_triplet = @host@ +@HAVE_VERSIONING_TRUE@am__append_1 = -Wl,--version-script=$(srcdir)/../modules.map +subdir = modules/pam_shells +DIST_COMMON = README 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distdir dvi dvi-am html \ + html-am info info-am install install-am install-data \ + install-data-am install-dvi install-dvi-am install-exec \ + install-exec-am install-html install-html-am install-info \ + install-info-am install-man install-man8 install-pdf \ + install-pdf-am install-ps install-ps-am \ + install-securelibLTLIBRARIES install-strip installcheck \ + installcheck-am installdirs maintainer-clean \ + maintainer-clean-generic mostlyclean mostlyclean-compile \ + mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \ + tags uninstall uninstall-am uninstall-man uninstall-man8 \ + uninstall-securelibLTLIBRARIES + +@ENABLE_REGENERATE_MAN_TRUE@README: pam_shells.8.xml +@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_shells/README b/modules/pam_shells/README new file mode 100644 index 00000000..f4658be3 --- /dev/null +++ b/modules/pam_shells/README @@ -0,0 +1,24 @@ +pam_shells — PAM module to check for valid login shell + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +pam_shells is a PAM module that only allows access to the system if the users +shell is listed in /etc/shells. + +It also checks if /etc/shells is a plain file and not world writable. + +OPTIONS + +This module does not recognise any options. + +EXAMPLES + +auth required pam_shells.so + + +AUTHOR + +pam_shells was written by Erik Troan <ewt@redhat.com>. + diff --git a/modules/pam_shells/README.xml b/modules/pam_shells/README.xml new file mode 100644 index 00000000..154b97b5 --- /dev/null +++ b/modules/pam_shells/README.xml @@ -0,0 +1,41 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_shells.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_shells.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_shells-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_shells.8.xml" xpointer='xpointer(//refsect1[@id = "pam_shells-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_shells.8.xml" xpointer='xpointer(//refsect1[@id = "pam_shells-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_shells.8.xml" xpointer='xpointer(//refsect1[@id = "pam_shells-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_shells.8.xml" xpointer='xpointer(//refsect1[@id = "pam_shells-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_shells/pam_shells.8 b/modules/pam_shells/pam_shells.8 new file mode 100644 index 00000000..ceca6f1b --- /dev/null +++ b/modules/pam_shells/pam_shells.8 @@ -0,0 +1,73 @@ +.\" Title: pam_shells +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_SHELLS" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_shells - PAM module to check for valid login shell +.SH "SYNOPSIS" +.HP 14 +\fBpam_shells\.so\fR +.SH "DESCRIPTION" +.PP +pam_shells is a PAM module that only allows access to the system if the users shell is listed in +\fI/etc/shells\fR\. +.PP +It also checks if +\fI/etc/shells\fR +is a plain file and not world writable\. +.SH "OPTIONS" +.PP +This module does not recognise any options\. +.SH "MODULE SERVICES PROVIDED" +.PP +The services +\fBauth\fR +and +\fBaccount\fR +are supported\. +.SH "RETURN VALUES" +.PP +PAM_AUTH_ERR +.RS 4 +Access to the system was denied\. +.RE +.PP +PAM_SUCCESS +.RS 4 +The users login shell was listed as valid shell in +\fI/etc/shells\fR\. +.RE +.PP +PAM_SERVICE_ERR +.RS 4 +The module was not able to get the name of the user\. +.RE +.SH "EXAMPLES" +.PP + +.sp +.RS 4 +.nf +auth required pam_shells\.so + +.fi +.RE +.sp +.SH "SEE ALSO" +.PP + +\fBshells\fR(5), +\fBpam.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_shells was written by Erik Troan <ewt@redhat\.com>\. diff --git a/modules/pam_shells/pam_shells.8.xml b/modules/pam_shells/pam_shells.8.xml new file mode 100644 index 00000000..abbd5cbd --- /dev/null +++ b/modules/pam_shells/pam_shells.8.xml @@ -0,0 +1,117 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_shells"> + + <refmeta> + <refentrytitle>pam_shells</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_shells-name"> + <refname>pam_shells</refname> + <refpurpose>PAM module to check for valid login shell</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_shells-cmdsynopsis"> + <command>pam_shells.so</command> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_shells-description"> + + <title>DESCRIPTION</title> + + <para> + pam_shells is a PAM module that only allows access to the + system if the users shell is listed in <filename>/etc/shells</filename>. + </para> + <para> + It also checks if <filename>/etc/shells</filename> is a plain + file and not world writable. + </para> + </refsect1> + + <refsect1 id="pam_shells-options"> + + <title>OPTIONS</title> + <para> This module does not recognise any options.</para> + </refsect1> + + <refsect1 id="pam_shells-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + The services <option>auth</option> and <option>account</option> + are supported. + </para> + </refsect1> + + <refsect1 id='pam_shells-return_values'> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_AUTH_ERR</term> + <listitem> + <para> + Access to the system was denied. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + The users login shell was listed as valid shell in + <filename>/etc/shells</filename>. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_SERVICE_ERR</term> + <listitem> + <para> + The module was not able to get the name of the user. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id='pam_shells-examples'> + <title>EXAMPLES</title> + <para> + <programlisting> +auth required pam_shells.so + </programlisting> + </para> + </refsect1> + + <refsect1 id='pam_shells-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>shells</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_shells-author'> + <title>AUTHOR</title> + <para> + pam_shells was written by Erik Troan <ewt@redhat.com>. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_shells/pam_shells.c b/modules/pam_shells/pam_shells.c new file mode 100644 index 00000000..89fc297e --- /dev/null +++ b/modules/pam_shells/pam_shells.c @@ -0,0 +1,146 @@ +/* pam_shells module */ + +#define SHELL_FILE "/etc/shells" + +/* + * by Erik Troan <ewt@redhat.com>, Red Hat Software. + * August 5, 1996. + * This code shamelessly ripped from the pam_securetty module. + */ + +#include "config.h" + +#include <pwd.h> +#include <stdarg.h> +#include <string.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/stat.h> +#include <syslog.h> +#include <unistd.h> + +/* + * here, we make a definition for the externally accessible function + * in this file (this definition is required for static a module + * but strongly encouraged generally) it is used to instruct the + * modules include file to define the function prototypes. + */ + +#define PAM_SM_AUTH +#define PAM_SM_ACCOUNT + +#include <security/pam_modules.h> +#include <security/pam_modutil.h> +#include <security/pam_ext.h> + +static int perform_check(pam_handle_t *pamh) +{ + int retval = PAM_AUTH_ERR; + const char *userName; + char *userShell; + char shellFileLine[256]; + struct stat sb; + struct passwd * pw; + FILE * shellFile; + + retval = pam_get_user(pamh, &userName, NULL); + if (retval != PAM_SUCCESS) { + return PAM_SERVICE_ERR; + } + + if (!userName || (userName[0] == '\0')) { + + /* Don't let them use a NULL username... */ + retval = pam_get_user(pamh,&userName,NULL); + if (retval != PAM_SUCCESS) + return PAM_SERVICE_ERR; + + /* It could still be NULL the second time. */ + if (!userName || (userName[0] == '\0')) + return PAM_SERVICE_ERR; + } + + pw = pam_modutil_getpwnam(pamh, userName); + if (!pw) { + return PAM_AUTH_ERR; /* user doesn't exist */ + } + userShell = pw->pw_shell; + + if (stat(SHELL_FILE,&sb)) { + pam_syslog(pamh, LOG_ERR, "Cannot stat %s: %m", SHELL_FILE); + return PAM_AUTH_ERR; /* must have /etc/shells */ + } + + if ((sb.st_mode & S_IWOTH) || !S_ISREG(sb.st_mode)) { + pam_syslog(pamh, LOG_ERR, + "%s is either world writable or not a normal file", + SHELL_FILE); + return PAM_AUTH_ERR; + } + + shellFile = fopen(SHELL_FILE,"r"); + if (shellFile == NULL) { /* Check that we opened it successfully */ + pam_syslog(pamh, LOG_ERR, "Error opening %s: %m", SHELL_FILE); + return PAM_SERVICE_ERR; + } + + retval = 1; + + while(retval && (fgets(shellFileLine, 255, shellFile) != NULL)) { + if (shellFileLine[strlen(shellFileLine) - 1] == '\n') + shellFileLine[strlen(shellFileLine) - 1] = '\0'; + retval = strcmp(shellFileLine, userShell); + } + + fclose(shellFile); + + if (retval) { + return PAM_AUTH_ERR; + } else { + return PAM_SUCCESS; + } +} + +/* --- authentication management functions (only) --- */ + +PAM_EXTERN +int pam_sm_authenticate(pam_handle_t *pamh, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return perform_check(pamh); +} + +PAM_EXTERN +int pam_sm_setcred(pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_SUCCESS; +} + +/* --- account management functions (only) --- */ + +PAM_EXTERN +int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return perform_check(pamh); +} + +#ifdef PAM_STATIC + +/* static module data */ + +struct pam_module _pam_shells_modstruct = { + "pam_shells", + pam_sm_authenticate, + pam_sm_setcred, + pam_sm_acct_mgmt, + NULL, + NULL, + NULL, +}; + +#endif /* PAM_STATIC */ + +/* end of module definition */ diff --git a/modules/pam_shells/tst-pam_shells b/modules/pam_shells/tst-pam_shells new file mode 100755 index 00000000..dccc33d0 --- /dev/null +++ b/modules/pam_shells/tst-pam_shells @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_shells.so diff --git a/modules/pam_stress/Makefile.am b/modules/pam_stress/Makefile.am new file mode 100644 index 00000000..b5f80938 --- /dev/null +++ b/modules/pam_stress/Makefile.am @@ -0,0 +1,20 @@ +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README tst-pam_stress + +TESTS = tst-pam_stress + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include 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--- /dev/null +++ b/modules/pam_stress/README @@ -0,0 +1,64 @@ +# +# This describes the behavior of this module with respect to the +# /etc/pam.conf file. +# +# writen by Andrew Morgan <morgan@parc.power.net> +# + +This module recognizes the following arguments. + +debug put lots of information in syslog. + *NOTE* this option writes passwords to syslog, so + don't use anything sensitive when testing. + +no_warn don't give warnings about things (otherwise warnings are issued + via the conversation function) + +use_first_pass don't prompt for a password, for pam_sm_authentication + function just use item PAM_AUTHTOK. + +try_first_pass don't prompt for a password unless there has been no + previous authentication token (item PAM_AUTHTOK is NULL) + +rootok This is intended for the pam_sm_chauthtok function and + it instructs this function to permit root to change + the user's password without entering the old password. + +The following arguments are acted on by the module. They are intended +to make the module give the impression of failing as a fully +functioning module might. + +expired an argument intended for the account and chauthtok module + parts. It instructs the module to act as if the user's + password has expired + +fail_1 this instructs the module to make its first function fail. + +fail_2 this instructs the module to make its second function (if there + is one) fail. + + The function break up is indicated in the Module + Developers' Guide. Listed here it is: + + service function 1 function 2 + ------- ---------- ---------- + auth pam_sm_authenticate pam_sm_setcred + password pam_sm_chauthtok + session pam_sm_open_session pam_sm_close_session + account pam_sm_acct_mgmt + +prelim for pam_sm_chauthtok, means fail on PAM_PRELIM_CHECK. + +required for pam_sm_chauthtok, means fail if the user hasn't already + been authenticated by this module. (See stress_new_pwd data + item below.) + +# +# data strings that this module uses are the following: +# + +data name value(s) Comments +--------- -------- -------- +stress_new_pwd yes tells pam_sm_chauthtok that + pam_sm_acct_mgmt says we need a new + password diff --git a/modules/pam_stress/pam_stress.c b/modules/pam_stress/pam_stress.c new file mode 100644 index 00000000..c254868f --- /dev/null +++ b/modules/pam_stress/pam_stress.c @@ -0,0 +1,570 @@ +/* + * pam_stress module + * + * created by Andrew Morgan <morgan@linux.kernel.org> 1996/3/12 + */ + +#include "config.h" + +#include <stdlib.h> +#include <stdio.h> + +#include <syslog.h> + +#include <stdarg.h> +#include <string.h> +#include <unistd.h> + +/* + * here, we make definitions for the externally accessible functions + * in this file (these definitions are required for static modules + * but strongly encouraged generally) they are used to instruct the + * modules include file to define their prototypes. + */ + +#define PAM_SM_AUTH +#define PAM_SM_ACCOUNT +#define PAM_SM_SESSION +#define PAM_SM_PASSWORD + +#include <security/pam_modules.h> +#include <security/_pam_macros.h> +#include <security/pam_ext.h> + +/* ---------- */ + +/* an internal function to turn all possible test arguments into bits + of a ctrl number */ + +/* generic options */ + +#define PAM_ST_DEBUG 01 +#define PAM_ST_NO_WARN 02 +#define PAM_ST_USE_PASS1 04 +#define PAM_ST_TRY_PASS1 010 +#define PAM_ST_ROOTOK 020 + +/* simulation options */ + +#define PAM_ST_EXPIRED 040 +#define PAM_ST_FAIL_1 0100 +#define PAM_ST_FAIL_2 0200 +#define PAM_ST_PRELIM 0400 +#define PAM_ST_REQUIRE_PWD 01000 + +/* some syslogging */ + +static void +_pam_report (const pam_handle_t *pamh, int ctrl, const char *name, + int flags, int argc, const char **argv) +{ + if (ctrl & PAM_ST_DEBUG) { + pam_syslog(pamh, LOG_DEBUG, "CALLED: %s", name); + pam_syslog(pamh, LOG_DEBUG, "FLAGS : 0%o%s", + flags, (flags & PAM_SILENT) ? " (silent)":""); + pam_syslog(pamh, LOG_DEBUG, "CTRL = 0%o", ctrl); + pam_syslog(pamh, LOG_DEBUG, "ARGV :"); + while (argc--) { + pam_syslog(pamh, LOG_DEBUG, " \"%s\"", *argv++); + } + } +} + +static int +_pam_parse (const pam_handle_t *pamh, int argc, const char **argv) +{ + int ctrl=0; + + /* step through arguments */ + for (ctrl=0; argc-- > 0; ++argv) { + + /* generic options */ + + if (!strcmp(*argv,"debug")) + ctrl |= PAM_ST_DEBUG; + else if (!strcmp(*argv,"no_warn")) + ctrl |= PAM_ST_NO_WARN; + else if (!strcmp(*argv,"use_first_pass")) + ctrl |= PAM_ST_USE_PASS1; + else if (!strcmp(*argv,"try_first_pass")) + ctrl |= PAM_ST_TRY_PASS1; + else if (!strcmp(*argv,"rootok")) + ctrl |= PAM_ST_ROOTOK; + + /* simulation options */ + + else if (!strcmp(*argv,"expired")) /* signal password needs + renewal */ + ctrl |= PAM_ST_EXPIRED; + else if (!strcmp(*argv,"fail_1")) /* instruct fn 1 to fail */ + ctrl |= PAM_ST_FAIL_1; + else if (!strcmp(*argv,"fail_2")) /* instruct fn 2 to fail */ + ctrl |= PAM_ST_FAIL_2; + else if (!strcmp(*argv,"prelim")) /* instruct pam_sm_setcred + to fail on first call */ + ctrl |= PAM_ST_PRELIM; + else if (!strcmp(*argv,"required")) /* module is fussy about the + user being authenticated */ + ctrl |= PAM_ST_REQUIRE_PWD; + + else { + pam_syslog(pamh, LOG_ERR, "unknown option: %s", *argv); + } + } + + return ctrl; +} + +static int converse(pam_handle_t *pamh, int nargs + , struct pam_message **message + , struct pam_response **response) +{ + int retval; + const void *void_conv; + const struct pam_conv *conv; + + retval = pam_get_item(pamh,PAM_CONV,&void_conv); + conv = void_conv; + if (retval == PAM_SUCCESS && conv) { + retval = conv->conv(nargs, (const struct pam_message **) message + , response, conv->appdata_ptr); + if (retval != PAM_SUCCESS) { + pam_syslog(pamh, LOG_ERR, "converse returned %d: %s", + retval, pam_strerror(pamh, retval)); + } + } else { + pam_syslog(pamh, LOG_ERR, "converse failed to get pam_conv"); + if (retval == PAM_SUCCESS) + retval = PAM_BAD_ITEM; /* conv was null */ + } + + return retval; +} + +/* authentication management functions */ + +static int stress_get_password(pam_handle_t *pamh, int flags + , int ctrl, char **password) +{ + const void *pam_pass; + char *pass; + + if ( (ctrl & (PAM_ST_TRY_PASS1|PAM_ST_USE_PASS1)) + && (pam_get_item(pamh,PAM_AUTHTOK,&pam_pass) + == PAM_SUCCESS) + && (pam_pass != NULL) ) { + if ((pass = strdup(pam_pass)) == NULL) + return PAM_BUF_ERR; + } else if ((ctrl & PAM_ST_USE_PASS1)) { + pam_syslog(pamh, LOG_WARNING, "no forwarded password"); + return PAM_PERM_DENIED; + } else { /* we will have to get one */ + struct pam_message msg[1],*pmsg[1]; + struct pam_response *resp; + int retval; + + /* set up conversation call */ + + pmsg[0] = &msg[0]; + msg[0].msg_style = PAM_PROMPT_ECHO_OFF; + msg[0].msg = "STRESS Password: "; + resp = NULL; + + if ((retval = converse(pamh,1,pmsg,&resp)) != PAM_SUCCESS) { + return retval; + } + + if (resp) { + if ((resp[0].resp == NULL) && (ctrl & PAM_ST_DEBUG)) { + pam_syslog(pamh, LOG_DEBUG, + "pam_sm_authenticate: NULL authtok given"); + } + if ((flags & PAM_DISALLOW_NULL_AUTHTOK) + && resp[0].resp == NULL) { + free(resp); + return PAM_AUTH_ERR; + } + + pass = resp[0].resp; /* remember this! */ + + resp[0].resp = NULL; + } else { + if (ctrl & PAM_ST_DEBUG) { + pam_syslog(pamh, LOG_DEBUG, + "pam_sm_authenticate: no error reported"); + pam_syslog(pamh, LOG_DEBUG, + "getting password, but NULL returned!?"); + } + return PAM_CONV_ERR; + } + if (resp) + free(resp); + } + + *password = pass; /* this *MUST* be free()'d by this module */ + + return PAM_SUCCESS; +} + +/* function to clean up data items */ + +static void +wipe_up (pam_handle_t *pamh UNUSED, void *data, int error UNUSED) +{ + free(data); +} + +PAM_EXTERN +int pam_sm_authenticate(pam_handle_t *pamh, int flags, + int argc, const char **argv) +{ + const char *username; + int retval=PAM_SUCCESS; + char *pass; + int ctrl; + + D(("called.")); + + ctrl = _pam_parse(pamh, argc, argv); + _pam_report(pamh, ctrl, "pam_sm_authenticate", flags, argc, argv); + + /* try to get the username */ + + retval = pam_get_user(pamh, &username, "username: "); + if (retval != PAM_SUCCESS || !username) { + pam_syslog(pamh, LOG_WARNING, + "pam_sm_authenticate: failed to get username"); + if (retval == PAM_SUCCESS) + retval = PAM_USER_UNKNOWN; /* username was null */ + return retval; + } + else if ((ctrl & PAM_ST_DEBUG) && (retval == PAM_SUCCESS)) { + pam_syslog(pamh, LOG_DEBUG, + "pam_sm_authenticate: username = %s", username); + } + + /* now get the password */ + + retval = stress_get_password(pamh,flags,ctrl,&pass); + if (retval != PAM_SUCCESS) { + pam_syslog(pamh, LOG_WARNING, + "pam_sm_authenticate: failed to get a password"); + return retval; + } + + /* try to set password item */ + + retval = pam_set_item(pamh,PAM_AUTHTOK,pass); + _pam_overwrite(pass); /* clean up local copy of password */ + free(pass); + pass = NULL; + if (retval != PAM_SUCCESS) { + pam_syslog(pamh, LOG_WARNING, + "pam_sm_authenticate: failed to store new password"); + return retval; + } + + /* if we are debugging then we print the password */ + + if (ctrl & PAM_ST_DEBUG) { + const void *pam_pass; + (void) pam_get_item(pamh,PAM_AUTHTOK,&pam_pass); + pam_syslog(pamh, LOG_DEBUG, + "pam_st_authenticate: password entered is: [%s]", + (const char *)pam_pass); + } + + /* if we signal a fail for this function then fail */ + + if ((ctrl & PAM_ST_FAIL_1) && retval == PAM_SUCCESS) + return PAM_PERM_DENIED; + + return retval; +} + +PAM_EXTERN +int pam_sm_setcred(pam_handle_t *pamh, int flags, + int argc, const char **argv) +{ + int ctrl = _pam_parse(pamh, argc, argv); + + D(("called. [post parsing]")); + + _pam_report(pamh, ctrl, "pam_sm_setcred", flags, argc, argv); + + if (ctrl & PAM_ST_FAIL_2) + return PAM_CRED_ERR; + + return PAM_SUCCESS; +} + +/* account management functions */ + +PAM_EXTERN +int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, + int argc, const char **argv) +{ + int ctrl = _pam_parse(pamh, argc, argv); + + D(("called. [post parsing]")); + + _pam_report(pamh, ctrl,"pam_sm_acct_mgmt", flags, argc, argv); + + if (ctrl & PAM_ST_FAIL_1) + return PAM_PERM_DENIED; + else if (ctrl & PAM_ST_EXPIRED) { + int retval; + void *text = strdup("yes"); + if (!text) + return PAM_BUF_ERR; + retval = pam_set_data(pamh,"stress_new_pwd",text,wipe_up); + if (retval != PAM_SUCCESS) { + pam_syslog(pamh, LOG_DEBUG, + "pam_sm_acct_mgmt: failed setting stress_new_pwd"); + free(text); + return retval; + } + + if (ctrl & PAM_ST_DEBUG) { + pam_syslog(pamh, LOG_DEBUG, + "pam_sm_acct_mgmt: need a new password"); + } + return PAM_NEW_AUTHTOK_REQD; + } + + return PAM_SUCCESS; +} + +PAM_EXTERN +int pam_sm_open_session(pam_handle_t *pamh, int flags, + int argc, const char **argv) +{ + const void *username, *service; + int ctrl = _pam_parse(pamh, argc, argv); + + D(("called. [post parsing]")); + + _pam_report(pamh, ctrl,"pam_sm_open_session", flags, argc, argv); + + if ((pam_get_item(pamh, PAM_USER, &username) + != PAM_SUCCESS || !username) + || (pam_get_item(pamh, PAM_SERVICE, &service) + != PAM_SUCCESS || !service)) { + pam_syslog(pamh, LOG_WARNING, "pam_sm_open_session: for whom?"); + return PAM_SESSION_ERR; + } + + pam_syslog(pamh, LOG_NOTICE, "opened [%s] session for user [%s]", + (const char *)service, (const char *)username); + + if (ctrl & PAM_ST_FAIL_1) + return PAM_SESSION_ERR; + + return PAM_SUCCESS; +} + +PAM_EXTERN +int pam_sm_close_session(pam_handle_t *pamh, int flags, + int argc, const char **argv) +{ + const void *username, *service; + int ctrl = _pam_parse(pamh, argc, argv); + + D(("called. [post parsing]")); + + _pam_report(pamh, ctrl,"pam_sm_close_session", flags, argc, argv); + + if ((pam_get_item(pamh, PAM_USER, &username) + != PAM_SUCCESS || !username) + || (pam_get_item(pamh, PAM_SERVICE, &service) + != PAM_SUCCESS || !service)) { + pam_syslog(pamh, LOG_WARNING, "pam_sm_close_session: for whom?"); + return PAM_SESSION_ERR; + } + + pam_syslog(pamh, LOG_NOTICE, "closed [%s] session for user [%s]", + (const char *)service, (const char *)username); + + if (ctrl & PAM_ST_FAIL_2) + return PAM_SESSION_ERR; + + return PAM_SUCCESS; +} + +PAM_EXTERN +int pam_sm_chauthtok(pam_handle_t *pamh, int flags, + int argc, const char **argv) +{ + int retval; + int ctrl = _pam_parse(pamh, argc, argv); + + D(("called. [post parsing]")); + + _pam_report(pamh, ctrl,"pam_sm_chauthtok", flags, argc, argv); + + /* this function should be called twice by the Linux-PAM library */ + + if (flags & PAM_PRELIM_CHECK) { /* first call */ + if (ctrl & PAM_ST_DEBUG) { + pam_syslog(pamh, LOG_DEBUG, "pam_sm_chauthtok: prelim check"); + } + if (ctrl & PAM_ST_PRELIM) + return PAM_TRY_AGAIN; + + return PAM_SUCCESS; + } else if (flags & PAM_UPDATE_AUTHTOK) { /* second call */ + struct pam_message msg[3],*pmsg[3]; + struct pam_response *resp; + const void *text; + char *txt=NULL; + int i; + + if (ctrl & PAM_ST_DEBUG) { + pam_syslog(pamh, LOG_DEBUG, "pam_sm_chauthtok: alter password"); + } + + if (ctrl & PAM_ST_FAIL_1) + return PAM_AUTHTOK_LOCK_BUSY; + + if ( !(ctrl && PAM_ST_EXPIRED) + && (flags & PAM_CHANGE_EXPIRED_AUTHTOK) + && (pam_get_data(pamh,"stress_new_pwd", &text) + != PAM_SUCCESS || strcmp(text,"yes"))) { + return PAM_SUCCESS; /* the token has not expired */ + } + + /* the password should be changed */ + + if ((ctrl & PAM_ST_REQUIRE_PWD) + && !(getuid() == 0 && (ctrl & PAM_ST_ROOTOK)) + ) { /* first get old one? */ + char *pass; + + if (ctrl & PAM_ST_DEBUG) { + pam_syslog(pamh, LOG_DEBUG, + "pam_sm_chauthtok: getting old password"); + } + retval = stress_get_password(pamh,flags,ctrl,&pass); + if (retval != PAM_SUCCESS) { + pam_syslog(pamh, LOG_DEBUG, + "pam_sm_chauthtok: no password obtained"); + return retval; + } + retval = pam_set_item(pamh, PAM_OLDAUTHTOK, pass); + _pam_overwrite(pass); + free(pass); + pass = NULL; + if (retval != PAM_SUCCESS) { + pam_syslog(pamh, LOG_DEBUG, + "pam_sm_chauthtok: could not set OLDAUTHTOK"); + return retval; + } + } + + /* set up for conversation */ + + if (!(flags & PAM_SILENT)) { + const void *username; + + if ( pam_get_item(pamh, PAM_USER, &username) + || username == NULL ) { + pam_syslog(pamh, LOG_ERR, "no username set"); + return PAM_USER_UNKNOWN; + } + pmsg[0] = &msg[0]; + msg[0].msg_style = PAM_TEXT_INFO; + if (asprintf(&txt, _("Changing STRESS password for %s."), + (const char *)username) < 0) { + pam_syslog(pamh, LOG_CRIT, "out of memory"); + return PAM_BUF_ERR; + } + + msg[0].msg = txt; + i = 1; + } else { + i = 0; + } + + pmsg[i] = &msg[i]; + msg[i].msg_style = PAM_PROMPT_ECHO_OFF; + msg[i++].msg = _("Enter new STRESS password: "); + pmsg[i] = &msg[i]; + msg[i].msg_style = PAM_PROMPT_ECHO_OFF; + msg[i++].msg = _("Retype new STRESS password: "); + resp = NULL; + + retval = converse(pamh,i,pmsg,&resp); + if (txt) { + free(txt); + txt = NULL; /* clean up */ + } + if (retval != PAM_SUCCESS) { + return retval; + } + + if (resp == NULL) { + pam_syslog(pamh, LOG_ERR, + "pam_sm_chauthtok: no response from conv"); + return PAM_CONV_ERR; + } + + /* store the password */ + + if (resp[i-2].resp && resp[i-1].resp) { + if (strcmp(resp[i-2].resp,resp[i-1].resp)) { + /* passwords are not the same; forget and return error */ + + _pam_drop_reply(resp, i); + + if (!(flags & PAM_SILENT) && !(ctrl & PAM_ST_NO_WARN)) { + pmsg[0] = &msg[0]; + msg[0].msg_style = PAM_ERROR_MSG; + msg[0].msg = _("Verification mis-typed; " + "password unchanged"); + resp = NULL; + (void) converse(pamh,1,pmsg,&resp); + if (resp) { + _pam_drop_reply(resp, 1); + } + } + return PAM_AUTHTOK_ERR; + } + + if (pam_get_item(pamh,PAM_AUTHTOK,&text) + == PAM_SUCCESS) { + (void) pam_set_item(pamh,PAM_OLDAUTHTOK,text); + text = NULL; + } + (void) pam_set_item(pamh,PAM_AUTHTOK,resp[0].resp); + } else { + pam_syslog(pamh, LOG_DEBUG, + "pam_sm_chauthtok: problem with resp"); + retval = PAM_SYSTEM_ERR; + } + + _pam_drop_reply(resp, i); /* clean up the passwords */ + } else { + pam_syslog(pamh, LOG_ERR, + "pam_sm_chauthtok: this must be a Linux-PAM error"); + return PAM_SYSTEM_ERR; + } + + return retval; +} + + +#ifdef PAM_STATIC + +/* static module data */ + +struct pam_module _pam_stress_modstruct = { + "pam_stress", + pam_sm_authenticate, + pam_sm_setcred, + pam_sm_acct_mgmt, + pam_sm_open_session, + pam_sm_close_session, + pam_sm_chauthtok +}; + +#endif diff --git a/modules/pam_stress/tst-pam_stress b/modules/pam_stress/tst-pam_stress new file mode 100755 index 00000000..24be7560 --- /dev/null +++ b/modules/pam_stress/tst-pam_stress @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_stress.so diff --git a/modules/pam_succeed_if/Makefile.am b/modules/pam_succeed_if/Makefile.am new file mode 100644 index 00000000..0394f42d --- /dev/null +++ b/modules/pam_succeed_if/Makefile.am @@ -0,0 +1,31 @@ +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README ${MANS} ${XMLS} tst-pam_succeed_if + +TESTS = tst-pam_succeed_if + +man_MANS = pam_succeed_if.8 + +XMLS = README.xml pam_succeed_if.8.xml + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_succeed_if.la +pam_succeed_if_la_LIBADD = -L$(top_builddir)/libpam -lpam + +if ENABLE_REGENERATE_MAN +noinst_DATA = README +README: pam_succeed_if.8.xml +-include $(top_srcdir)/Make.xml.rules +endif diff --git a/modules/pam_succeed_if/Makefile.in b/modules/pam_succeed_if/Makefile.in new file mode 100644 index 00000000..d155d22f --- /dev/null +++ b/modules/pam_succeed_if/Makefile.in @@ -0,0 +1,667 @@ +# Makefile.in generated by automake 1.10.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY, to the extent permitted by law; without +# even the implied warranty of MERCHANTABILITY or FITNESS FOR A +# PARTICULAR PURPOSE. + +@SET_MAKE@ + +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + + +VPATH = @srcdir@ +pkgdatadir = $(datadir)/@PACKAGE@ +pkglibdir = $(libdir)/@PACKAGE@ +pkgincludedir = $(includedir)/@PACKAGE@ +am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd +install_sh_DATA = $(install_sh) -c -m 644 +install_sh_PROGRAM = $(install_sh) -c +install_sh_SCRIPT = $(install_sh) -c +INSTALL_HEADER = $(INSTALL_DATA) +transform = $(program_transform_name) +NORMAL_INSTALL = : +PRE_INSTALL = : +POST_INSTALL = : +NORMAL_UNINSTALL = : +PRE_UNINSTALL = : +POST_UNINSTALL = : +build_triplet = @build@ +host_triplet = @host@ +@HAVE_VERSIONING_TRUE@am__append_1 = -Wl,--version-script=$(srcdir)/../modules.map +subdir = modules/pam_succeed_if +DIST_COMMON = README $(srcdir)/Makefile.am $(srcdir)/Makefile.in +ACLOCAL_M4 = $(top_srcdir)/aclocal.m4 +am__aclocal_m4_deps = $(top_srcdir)/m4/gettext.m4 \ + $(top_srcdir)/m4/iconv.m4 \ + $(top_srcdir)/m4/jh_path_xml_catalog.m4 \ + $(top_srcdir)/m4/ld-O1.m4 $(top_srcdir)/m4/ld-as-needed.m4 \ + $(top_srcdir)/m4/lib-ld.m4 $(top_srcdir)/m4/lib-link.m4 \ + $(top_srcdir)/m4/lib-prefix.m4 $(top_srcdir)/m4/libprelude.m4 \ + $(top_srcdir)/m4/nls.m4 $(top_srcdir)/m4/po.m4 \ + $(top_srcdir)/m4/progtest.m4 $(top_srcdir)/acinclude.m4 \ + $(top_srcdir)/configure.in +am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \ + $(ACLOCAL_M4) +mkinstalldirs = $(SHELL) $(top_srcdir)/mkinstalldirs +CONFIG_HEADER = $(top_builddir)/config.h +CONFIG_CLEAN_FILES = +am__vpath_adj_setup = srcdirstrip=`echo "$(srcdir)" | sed 's|.|.|g'`; +am__vpath_adj = case $$p in \ + $(srcdir)/*) f=`echo "$$p" | sed "s|^$$srcdirstrip/||"`;; \ + *) f=$$p;; \ + esac; +am__strip_dir = `echo $$p | sed -e 's|^.*/||'`; +am__installdirs = "$(DESTDIR)$(securelibdir)" "$(DESTDIR)$(man8dir)" +securelibLTLIBRARIES_INSTALL = $(INSTALL) +LTLIBRARIES = $(securelib_LTLIBRARIES) 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distdir dvi dvi-am html \ + html-am info info-am install install-am install-data \ + install-data-am install-dvi install-dvi-am install-exec \ + install-exec-am install-html install-html-am install-info \ + install-info-am install-man install-man8 install-pdf \ + install-pdf-am install-ps install-ps-am \ + install-securelibLTLIBRARIES install-strip installcheck \ + installcheck-am installdirs maintainer-clean \ + maintainer-clean-generic mostlyclean mostlyclean-compile \ + mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \ + tags uninstall uninstall-am uninstall-man uninstall-man8 \ + uninstall-securelibLTLIBRARIES + +@ENABLE_REGENERATE_MAN_TRUE@README: pam_succeed_if.8.xml +@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_succeed_if/README b/modules/pam_succeed_if/README new file mode 100644 index 00000000..6e4907c6 --- /dev/null +++ b/modules/pam_succeed_if/README @@ -0,0 +1,124 @@ +pam_succeed_if — test account characteristics + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +pam_succeed_if.so is designed to succeed or fail authentication based on +characteristics of the account belonging to the user being authenticated. One +use is to select whether to load other modules based on this test. + +The module should be given one or more conditions as module arguments, and +authentication will succeed only if all of the conditions are met. + +OPTIONS + +The following flags are supported: + +debug + + Turns on debugging messages sent to syslog. + +use_uid + + Evaluate conditions using the account of the user whose UID the application + is running under instead of the user being authenticated. + +quiet + + Don't log failure or success to the system log. + +quiet_fail + + Don't log failure to the system log. + +quiet_success + + Don't log success to the system log. + +Conditions are three words: a field, a test, and a value to test for. + +Available fields are user, uid, gid, shell, home and service: + +field < number + + Field has a value numerically less than number. + +field <= number + + Field has a value numerically less than or equal to number. + +field eq number + + Field has a value numerically equal to number. + +field >= number + + Field has a value numerically greater than or equal to number. + +field > number + + Field has a value numerically greater than number. + +field ne number + + Field has a value numerically different from number. + +field = string + + Field exactly matches the given string. + +field != string + + Field does not match the given string. + +field =~ glob + + Field matches the given glob. + +field !~ glob + + Field does not match the given glob. + +field in item:item:... + + Field is contained in the list of items separated by colons. + +field notin item:item:... + + Field is not contained in the list of items separated by colons. + +user ingroup group + + User is in given group. + +user notingroup group + + User is not in given group. + +user innetgr netgroup + + (user,host) is in given netgroup. + +user notinnetgr group + + (user,host) is not in given netgroup. + +EXAMPLES + +To emulate the behaviour of pam_wheel, except there is no fallback to group 0: + +auth required pam_succeed_if.so quiet user ingroup wheel + + +Given that the type matches, only loads the othermodule rule if the UID is over +500. Adjust the number after default to skip several rules. + +type [default=1 success=ignore] pam_succeed_if.so quiet uid > 500 +type required othermodule.so arguments... + + +AUTHOR + +Nalin Dahyabhai <nalin@redhat.com> + diff --git a/modules/pam_succeed_if/README.xml b/modules/pam_succeed_if/README.xml new file mode 100644 index 00000000..c52f00a0 --- /dev/null +++ b/modules/pam_succeed_if/README.xml @@ -0,0 +1,41 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_succeed_if.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_succeed_if.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_succeed_if-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_succeed_if.8.xml" xpointer='xpointer(//refsect1[@id = "pam_succeed_if-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_succeed_if.8.xml" xpointer='xpointer(//refsect1[@id = "pam_succeed_if-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_succeed_if.8.xml" xpointer='xpointer(//refsect1[@id = "pam_succeed_if-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_succeed_if.8.xml" xpointer='xpointer(//refsect1[@id = "pam_succeed_if-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_succeed_if/pam_succeed_if.8 b/modules/pam_succeed_if/pam_succeed_if.8 new file mode 100644 index 00000000..65c710e8 --- /dev/null +++ b/modules/pam_succeed_if/pam_succeed_if.8 @@ -0,0 +1,191 @@ +.\" Title: pam_succeed_if +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM +.\" Source: Linux-PAM +.\" +.TH "PAM_SUCCEED_IF" "8" "04/16/2008" "Linux-PAM" "Linux\-PAM" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_succeed_if - test account characteristics +.SH "SYNOPSIS" +.HP 18 +\fBpam_succeed_if\.so\fR [\fIflag\fR...] [\fIcondition\fR...] +.SH "DESCRIPTION" +.PP +pam_succeed_if\.so is designed to succeed or fail authentication based on characteristics of the account belonging to the user being authenticated\. One use is to select whether to load other modules based on this test\. +.PP +The module should be given one or more conditions as module arguments, and authentication will succeed only if all of the conditions are met\. +.SH "OPTIONS" +.PP +The following +\fIflag\fRs are supported: +.PP +\fBdebug\fR +.RS 4 +Turns on debugging messages sent to syslog\. +.RE +.PP +\fBuse_uid\fR +.RS 4 +Evaluate conditions using the account of the user whose UID the application is running under instead of the user being authenticated\. +.RE +.PP +\fBquiet\fR +.RS 4 +Don\'t log failure or success to the system log\. +.RE +.PP +\fBquiet_fail\fR +.RS 4 +Don\'t log failure to the system log\. +.RE +.PP +\fBquiet_success\fR +.RS 4 +Don\'t log success to the system log\. +.RE +.PP + +\fICondition\fRs are three words: a field, a test, and a value to test for\. +.PP +Available fields are +\fIuser\fR, +\fIuid\fR, +\fIgid\fR, +\fIshell\fR, +\fIhome\fR +and +\fIservice\fR: +.PP +\fBfield < number\fR +.RS 4 +Field has a value numerically less than number\. +.RE +.PP +\fBfield <= number\fR +.RS 4 +Field has a value numerically less than or equal to number\. +.RE +.PP +\fBfield eq number\fR +.RS 4 +Field has a value numerically equal to number\. +.RE +.PP +\fBfield >= number\fR +.RS 4 +Field has a value numerically greater than or equal to number\. +.RE +.PP +\fBfield > number\fR +.RS 4 +Field has a value numerically greater than number\. +.RE +.PP +\fBfield ne number\fR +.RS 4 +Field has a value numerically different from number\. +.RE +.PP +\fBfield = string\fR +.RS 4 +Field exactly matches the given string\. +.RE +.PP +\fBfield != string\fR +.RS 4 +Field does not match the given string\. +.RE +.PP +\fBfield =~ glob\fR +.RS 4 +Field matches the given glob\. +.RE +.PP +\fBfield !~ glob\fR +.RS 4 +Field does not match the given glob\. +.RE +.PP +\fBfield in item:item:\.\.\.\fR +.RS 4 +Field is contained in the list of items separated by colons\. +.RE +.PP +\fBfield notin item:item:\.\.\.\fR +.RS 4 +Field is not contained in the list of items separated by colons\. +.RE +.PP +\fBuser ingroup group\fR +.RS 4 +User is in given group\. +.RE +.PP +\fBuser notingroup group\fR +.RS 4 +User is not in given group\. +.RE +.PP +\fBuser innetgr netgroup\fR +.RS 4 +(user,host) is in given netgroup\. +.RE +.PP +\fBuser notinnetgr group\fR +.RS 4 +(user,host) is not in given netgroup\. +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +All services are supported\. +.SH "RETURN VALUES" +.PP +PAM_SUCCESS +.RS 4 +The condition was true\. +.RE +.PP +PAM_AUTH_ERR +.RS 4 +The condition was false\. +.RE +.PP +PAM_SERVICE_ERR +.RS 4 +A service error occured or the arguments can\'t be parsed as numbers\. +.RE +.SH "EXAMPLES" +.PP +To emulate the behaviour of +\fIpam_wheel\fR, except there is no fallback to group 0: +.sp +.RS 4 +.nf +auth required pam_succeed_if\.so quiet user ingroup wheel + +.fi +.RE +.PP +Given that the type matches, only loads the othermodule rule if the UID is over 500\. Adjust the number after default to skip several rules\. +.sp +.RS 4 +.nf +type [default=1 success=ignore] pam_succeed_if\.so quiet uid > 500 +type required othermodule\.so arguments\.\.\. + +.fi +.RE +.SH "SEE ALSO" +.PP + +\fBglob\fR(7), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +Nalin Dahyabhai <nalin@redhat\.com> diff --git a/modules/pam_succeed_if/pam_succeed_if.8.xml b/modules/pam_succeed_if/pam_succeed_if.8.xml new file mode 100644 index 00000000..d064e03b --- /dev/null +++ b/modules/pam_succeed_if/pam_succeed_if.8.xml @@ -0,0 +1,297 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + + +<refentry id='pam_succeed_if'> +<!-- Copyright 2003, 2004 Red Hat, Inc. --> +<!-- Written by Nalin Dahyabhai <nalin@redhat.com> --> + + <refmeta> + <refentrytitle>pam_succeed_if</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class='sectdesc'>Linux-PAM</refmiscinfo> + </refmeta> + + <refnamediv id='pam_succeed_if-name'> + <refname>pam_succeed_if</refname> + <refpurpose>test account characteristics</refpurpose> + </refnamediv> + + + <refsynopsisdiv> + <cmdsynopsis id='pam_succeed_if-cmdsynopsis'> + <command>pam_succeed_if.so</command> + <arg choice='opt' rep='repeat'><replaceable>flag</replaceable></arg> + <arg choice='opt' rep='repeat'><replaceable>condition</replaceable></arg> + </cmdsynopsis> + </refsynopsisdiv> + + + <refsect1 id='pam_succeed_if-description'> + <title>DESCRIPTION</title> + <para> + pam_succeed_if.so is designed to succeed or fail authentication + based on characteristics of the account belonging to the user being + authenticated. One use is to select whether to load other modules based + on this test. + </para> + + <para> + The module should be given one or more conditions as module arguments, + and authentication will succeed only if all of the conditions are met. + </para> + </refsect1> + + <refsect1 id="pam_succeed_if-options"> + <title>OPTIONS</title> + <para> + The following <emphasis>flag</emphasis>s are supported: + </para> + + <variablelist> + <varlistentry> + <term><option>debug</option></term> + <listitem> + <para>Turns on debugging messages sent to syslog.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>use_uid</option></term> + <listitem> + <para> + Evaluate conditions using the account of the user whose UID + the application is running under instead of the user being + authenticated. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>quiet</option></term> + <listitem> + <para>Don't log failure or success to the system log.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>quiet_fail</option></term> + <listitem> + <para> + Don't log failure to the system log. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>quiet_success</option></term> + <listitem> + <para> + Don't log success to the system log. + </para> + </listitem> + </varlistentry> + </variablelist> + + <para> + <emphasis>Condition</emphasis>s are three words: a field, a test, + and a value to test for. + </para> + <para> + Available fields are <emphasis>user</emphasis>, + <emphasis>uid</emphasis>, <emphasis>gid</emphasis>, + <emphasis>shell</emphasis>, <emphasis>home</emphasis> + and <emphasis>service</emphasis>: + </para> + + <variablelist> + <varlistentry> + <term><option>field < number</option></term> + <listitem> + <para>Field has a value numerically less than number.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>field <= number</option></term> + <listitem> + <para> + Field has a value numerically less than or equal to number. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>field eq number</option></term> + <listitem> + <para> + Field has a value numerically equal to number. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>field >= number</option></term> + <listitem> + <para> + Field has a value numerically greater than or equal to number. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>field > number</option></term> + <listitem> + <para> + Field has a value numerically greater than number. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>field ne number</option></term> + <listitem> + <para> + Field has a value numerically different from number. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>field = string</option></term> + <listitem> + <para> + Field exactly matches the given string. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>field != string</option></term> + <listitem> + <para> + Field does not match the given string. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>field =~ glob</option></term> + <listitem> + <para>Field matches the given glob.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>field !~ glob</option></term> + <listitem> + <para>Field does not match the given glob.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>field in item:item:...</option></term> + <listitem> + <para>Field is contained in the list of items separated by colons.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>field notin item:item:...</option></term> + <listitem> + <para>Field is not contained in the list of items separated by colons.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>user ingroup group</option></term> + <listitem> + <para>User is in given group.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>user notingroup group</option></term> + <listitem> + <para>User is not in given group.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>user innetgr netgroup</option></term> + <listitem> + <para>(user,host) is in given netgroup.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><option>user notinnetgr group</option></term> + <listitem> + <para>(user,host) is not in given netgroup.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_succeed_if-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + All services are supported. + </para> + </refsect1> + + <refsect1 id='pam_succeed_if-return_values'> + <title>RETURN VALUES</title> + <variablelist> + + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + The condition was true. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_AUTH_ERR</term> + <listitem> + <para> + The condition was false. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_SERVICE_ERR</term> + <listitem> + <para> + A service error occured or the arguments can't be + parsed as numbers. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + + <refsect1 id='pam_succeed_if-examples'> + <title>EXAMPLES</title> + <para> + To emulate the behaviour of <emphasis>pam_wheel</emphasis>, except + there is no fallback to group 0: + </para> + <programlisting> +auth required pam_succeed_if.so quiet user ingroup wheel + </programlisting> + + <para> + Given that the type matches, only loads the othermodule rule if + the UID is over 500. Adjust the number after default to skip + several rules. + </para> + <programlisting> +type [default=1 success=ignore] pam_succeed_if.so quiet uid > 500 +type required othermodule.so arguments... + </programlisting> + </refsect1> + + <refsect1 id='pam_succeed_if-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>glob</refentrytitle><manvolnum>7</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_succeed_if-author'> + <title>AUTHOR</title> + <para>Nalin Dahyabhai <nalin@redhat.com></para> + </refsect1> +</refentry> diff --git a/modules/pam_succeed_if/pam_succeed_if.c b/modules/pam_succeed_if/pam_succeed_if.c new file mode 100644 index 00000000..06cb5d6a --- /dev/null +++ b/modules/pam_succeed_if/pam_succeed_if.c @@ -0,0 +1,552 @@ +/****************************************************************************** + * A simple user-attribute based module for PAM. + * + * Copyright (c) 2003 Red Hat, Inc. + * Written by Nalin Dahyabhai <nalin@redhat.com> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, and the entire permission notice in its entirety, + * including the disclaimer of warranties. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * ALTERNATIVELY, this product may be distributed under the terms of + * the GNU Public License, in which case the provisions of the GPL are + * required INSTEAD OF the above restrictions. (This clause is + * necessary due to a potential bad interaction between the GPL and + * the restrictions contained in a BSD-style copyright.) + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ + +#include "config.h" + +#include <sys/types.h> +#include <errno.h> +#include <fcntl.h> +#include <fnmatch.h> +#include <limits.h> +#include <stdarg.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <syslog.h> +#include <unistd.h> +#include <pwd.h> +#include <grp.h> +#include <netdb.h> + +#define PAM_SM_AUTH +#define PAM_SM_ACCOUNT +#define PAM_SM_SESSION +#define PAM_SM_PASSWORD + +#include <security/pam_modules.h> +#include <security/pam_modutil.h> +#include <security/pam_ext.h> + +/* Basically, run cmp(atol(left), atol(right)), returning PAM_SUCCESS if + * the function returns non-zero, PAM_AUTH_ERR if it returns zero, and + * PAM_SERVICE_ERR if the arguments can't be parsed as numbers. */ +static int +evaluate_num(const pam_handle_t *pamh, const char *left, + const char *right, int (*cmp)(int, int)) +{ + long l, r; + char *p; + int ret = PAM_SUCCESS; + + errno = 0; + l = strtol(left, &p, 0); + if ((p == NULL) || (*p != '\0') || errno) { + pam_syslog(pamh, LOG_INFO, "\"%s\" is not a number", left); + ret = PAM_SERVICE_ERR; + } + + r = strtol(right, &p, 0); + if ((p == NULL) || (*p != '\0') || errno) { + pam_syslog(pamh, LOG_INFO, "\"%s\" is not a number", right); + ret = PAM_SERVICE_ERR; + } + + if (ret != PAM_SUCCESS) { + return ret; + } + + return cmp(l, r) ? PAM_SUCCESS : PAM_AUTH_ERR; +} + +/* Simple numeric comparison callbacks. */ +static int +eq(int i, int j) +{ + return i == j; +} +static int +ne(int i, int j) +{ + return i != j; +} +static int +lt(int i, int j) +{ + return i < j; +} +static int +le(int i, int j) +{ + return lt(i, j) || eq(i, j); +} +static int +gt(int i, int j) +{ + return i > j; +} +static int +ge(int i, int j) +{ + return gt(i, j) || eq(i, j); +} + +/* Test for numeric equality. */ +static int +evaluate_eqn(const pam_handle_t *pamh, const char *left, const char *right) +{ + return evaluate_num(pamh, left, right, eq); +} +/* Test for string equality. */ +static int +evaluate_eqs(const char *left, const char *right) +{ + return (strcmp(left, right) == 0) ? PAM_SUCCESS : PAM_AUTH_ERR; +} +/* Test for numeric inequality. */ +static int +evaluate_nen(const pam_handle_t *pamh, const char *left, const char *right) +{ + return evaluate_num(pamh, left, right, ne); +} +/* Test for string inequality. */ +static int +evaluate_nes(const char *left, const char *right) +{ + return (strcmp(left, right) != 0) ? PAM_SUCCESS : PAM_AUTH_ERR; +} +/* Test for numeric less-than-ness(?) */ +static int +evaluate_lt(const pam_handle_t *pamh, const char *left, const char *right) +{ + return evaluate_num(pamh, left, right, lt); +} +/* Test for numeric less-than-or-equal-ness(?) */ +static int +evaluate_le(const pam_handle_t *pamh, const char *left, const char *right) +{ + return evaluate_num(pamh, left, right, le); +} +/* Test for numeric greater-than-ness(?) */ +static int +evaluate_gt(const pam_handle_t *pamh, const char *left, const char *right) +{ + return evaluate_num(pamh, left, right, gt); +} +/* Test for numeric greater-than-or-equal-ness(?) */ +static int +evaluate_ge(const pam_handle_t *pamh, const char *left, const char *right) +{ + return evaluate_num(pamh, left, right, ge); +} +/* Check for file glob match. */ +static int +evaluate_glob(const char *left, const char *right) +{ + return (fnmatch(right, left, 0) == 0) ? PAM_SUCCESS : PAM_AUTH_ERR; +} +/* Check for file glob mismatch. */ +static int +evaluate_noglob(const char *left, const char *right) +{ + return (fnmatch(right, left, 0) != 0) ? PAM_SUCCESS : PAM_AUTH_ERR; +} +/* Check for list match. */ +static int +evaluate_inlist(const char *left, const char *right) +{ + char *p; + /* Don't care about left containing ':'. */ + while ((p=strstr(right, left)) != NULL) { + if (p == right || *(p-1) == ':') { /* ':' is a list separator */ + p += strlen(left); + if (*p == '\0' || *p == ':') { + return PAM_SUCCESS; + } + } + right = strchr(p, ':'); + if (right == NULL) + break; + else + ++right; + } + return PAM_AUTH_ERR; +} +/* Check for list mismatch. */ +static int +evaluate_notinlist(const char *left, const char *right) +{ + return evaluate_inlist(left, right) != PAM_SUCCESS ? PAM_SUCCESS : PAM_AUTH_ERR; +} +/* Return PAM_SUCCESS if the user is in the group. */ +static int +evaluate_ingroup(pam_handle_t *pamh, const char *user, const char *group) +{ + if (pam_modutil_user_in_group_nam_nam(pamh, user, group) == 1) + return PAM_SUCCESS; + return PAM_AUTH_ERR; +} +/* Return PAM_SUCCESS if the user is NOT in the group. */ +static int +evaluate_notingroup(pam_handle_t *pamh, const char *user, const char *group) +{ + if (pam_modutil_user_in_group_nam_nam(pamh, user, group) == 0) + return PAM_SUCCESS; + return PAM_AUTH_ERR; +} +/* Return PAM_SUCCESS if the (host,user) is in the netgroup. */ +static int +evaluate_innetgr(const char *host, const char *user, const char *group) +{ + if (innetgr(group, host, user, NULL) == 1) + return PAM_SUCCESS; + return PAM_AUTH_ERR; +} +/* Return PAM_SUCCESS if the (host,user) is NOT in the netgroup. */ +static int +evaluate_notinnetgr(const char *host, const char *user, const char *group) +{ + if (innetgr(group, host, user, NULL) == 0) + return PAM_SUCCESS; + return PAM_AUTH_ERR; +} + +/* Match a triple. */ +static int +evaluate(pam_handle_t *pamh, int debug, + const char *left, const char *qual, const char *right, + struct passwd *pwd) +{ + char buf[LINE_MAX] = ""; + const char *attribute = left; + /* Figure out what we're evaluating here, and convert it to a string.*/ + if ((strcasecmp(left, "login") == 0) || + (strcasecmp(left, "name") == 0) || + (strcasecmp(left, "user") == 0)) { + snprintf(buf, sizeof(buf), "%s", pwd->pw_name); + left = buf; + } + if (strcasecmp(left, "uid") == 0) { + snprintf(buf, sizeof(buf), "%lu", (unsigned long) pwd->pw_uid); + left = buf; + } + if (strcasecmp(left, "gid") == 0) { + snprintf(buf, sizeof(buf), "%lu", (unsigned long) pwd->pw_gid); + left = buf; + } + if (strcasecmp(left, "shell") == 0) { + snprintf(buf, sizeof(buf), "%s", pwd->pw_shell); + left = buf; + } + if ((strcasecmp(left, "home") == 0) || + (strcasecmp(left, "dir") == 0) || + (strcasecmp(left, "homedir") == 0)) { + snprintf(buf, sizeof(buf), "%s", pwd->pw_dir); + left = buf; + } + if (strcasecmp(left, "service") == 0) { + const void *svc; + if (pam_get_item(pamh, PAM_SERVICE, &svc) != PAM_SUCCESS) + svc = ""; + snprintf(buf, sizeof(buf), "%s", (const char *)svc); + left = buf; + } + /* If we have no idea what's going on, return an error. */ + if (left != buf) { + pam_syslog(pamh, LOG_CRIT, "unknown attribute \"%s\"", left); + return PAM_SERVICE_ERR; + } + if (debug) { + pam_syslog(pamh, LOG_DEBUG, "'%s' resolves to '%s'", + attribute, left); + } + + /* Attribute value < some threshold. */ + if ((strcasecmp(qual, "<") == 0) || + (strcasecmp(qual, "lt") == 0)) { + return evaluate_lt(pamh, left, right); + } + /* Attribute value <= some threshold. */ + if ((strcasecmp(qual, "<=") == 0) || + (strcasecmp(qual, "le") == 0)) { + return evaluate_le(pamh, left, right); + } + /* Attribute value > some threshold. */ + if ((strcasecmp(qual, ">") == 0) || + (strcasecmp(qual, "gt") == 0)) { + return evaluate_gt(pamh, left, right); + } + /* Attribute value >= some threshold. */ + if ((strcasecmp(qual, ">=") == 0) || + (strcasecmp(qual, "ge") == 0)) { + return evaluate_ge(pamh, left, right); + } + /* Attribute value == some threshold. */ + if (strcasecmp(qual, "eq") == 0) { + return evaluate_eqn(pamh, left, right); + } + /* Attribute value = some string. */ + if (strcasecmp(qual, "=") == 0) { + return evaluate_eqs(left, right); + } + /* Attribute value != some threshold. */ + if (strcasecmp(qual, "ne") == 0) { + return evaluate_nen(pamh, left, right); + } + /* Attribute value != some string. */ + if (strcasecmp(qual, "!=") == 0) { + return evaluate_nes(left, right); + } + /* Attribute value matches some pattern. */ + if ((strcasecmp(qual, "=~") == 0) || + (strcasecmp(qual, "glob") == 0)) { + return evaluate_glob(left, right); + } + if ((strcasecmp(qual, "!~") == 0) || + (strcasecmp(qual, "noglob") == 0)) { + return evaluate_noglob(left, right); + } + /* Attribute value matches item in list. */ + if (strcasecmp(qual, "in") == 0) { + return evaluate_inlist(left, right); + } + if (strcasecmp(qual, "notin") == 0) { + return evaluate_notinlist(left, right); + } + /* User is in this group. */ + if (strcasecmp(qual, "ingroup") == 0) { + return evaluate_ingroup(pamh, pwd->pw_name, right); + } + /* User is not in this group. */ + if (strcasecmp(qual, "notingroup") == 0) { + return evaluate_notingroup(pamh, pwd->pw_name, right); + } + /* (Rhost, user) is in this netgroup. */ + if (strcasecmp(qual, "innetgr") == 0) { + const void *rhost; + if (pam_get_item(pamh, PAM_RHOST, &rhost) != PAM_SUCCESS) + rhost = NULL; + return evaluate_innetgr(rhost, pwd->pw_name, right); + } + /* (Rhost, user) is not in this group. */ + if (strcasecmp(qual, "notinnetgr") == 0) { + const void *rhost; + if (pam_get_item(pamh, PAM_RHOST, &rhost) != PAM_SUCCESS) + rhost = NULL; + return evaluate_notinnetgr(rhost, pwd->pw_name, right); + } + /* Fail closed. */ + return PAM_SERVICE_ERR; +} + +PAM_EXTERN int +pam_sm_authenticate (pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + const void *prompt; + const char *user; + struct passwd *pwd; + int ret, i, count, use_uid, debug; + const char *left, *right, *qual; + int quiet_fail, quiet_succ; + + /* Get the user prompt. */ + ret = pam_get_item(pamh, PAM_USER_PROMPT, &prompt); + if ((ret != PAM_SUCCESS) || (prompt == NULL) || (strlen(prompt) == 0)) { + prompt = "login: "; + } + + quiet_fail = 0; + quiet_succ = 0; + for (use_uid = 0, debug = 0, i = 0; i < argc; i++) { + if (strcmp(argv[i], "debug") == 0) { + debug++; + } + if (strcmp(argv[i], "use_uid") == 0) { + use_uid++; + } + if (strcmp(argv[i], "quiet") == 0) { + quiet_fail++; + quiet_succ++; + } + if (strcmp(argv[i], "quiet_fail") == 0) { + quiet_fail++; + } + if (strcmp(argv[i], "quiet_success") == 0) { + quiet_succ++; + } + } + + if (use_uid) { + /* Get information about the user. */ + pwd = pam_modutil_getpwuid(pamh, getuid()); + if (pwd == NULL) { + pam_syslog(pamh, LOG_CRIT, + "error retrieving information about user %lu", + (unsigned long)getuid()); + return PAM_USER_UNKNOWN; + } + user = pwd->pw_name; + } else { + /* Get the user's name. */ + ret = pam_get_user(pamh, &user, prompt); + if ((ret != PAM_SUCCESS) || (user == NULL)) { + pam_syslog(pamh, LOG_CRIT, + "error retrieving user name: %s", + pam_strerror(pamh, ret)); + return ret; + } + + /* Get information about the user. */ + pwd = pam_modutil_getpwnam(pamh, user); + if (pwd == NULL) { + pam_syslog(pamh, LOG_CRIT, + "error retrieving information about user %s", + user); + return PAM_USER_UNKNOWN; + } + } + + /* Walk the argument list. */ + i = count = 0; + left = qual = right = NULL; + while (i <= argc) { + if ((left != NULL) && (qual != NULL) && (right != NULL)) { + ret = evaluate(pamh, debug, + left, qual, right, + pwd); + if (ret != PAM_SUCCESS) { + if(!quiet_fail) + pam_syslog(pamh, LOG_INFO, + "requirement \"%s %s %s\" " + "not met by user \"%s\"", + left, qual, right, user); + break; + } + else + if(!quiet_succ) + pam_syslog(pamh, LOG_INFO, + "requirement \"%s %s %s\" " + "was met by user \"%s\"", + left, qual, right, user); + left = qual = right = NULL; + } + if ((i < argc) && (strcmp(argv[i], "debug") == 0)) { + i++; + continue; + } + if ((i < argc) && (strcmp(argv[i], "use_uid") == 0)) { + i++; + continue; + } + if ((i < argc) && (strcmp(argv[i], "quiet") == 0)) { + i++; + continue; + } + if ((i < argc) && (strcmp(argv[i], "quiet_fail") == 0)) { + i++; + continue; + } + if ((i < argc) && (strcmp(argv[i], "quiet_success") == 0)) { + i++; + continue; + } + if ((i < argc) && (left == NULL)) { + left = argv[i++]; + count++; + continue; + } + if ((i < argc) && (qual == NULL)) { + qual = argv[i++]; + count++; + continue; + } + if ((i < argc) && (right == NULL)) { + right = argv[i++]; + count++; + continue; + } + i++; + } + + return ret; +} + +PAM_EXTERN int +pam_sm_setcred(pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_IGNORE; +} + +PAM_EXTERN int +pam_sm_acct_mgmt(pam_handle_t *pamh, int flags, int argc, const char **argv) +{ + return pam_sm_authenticate(pamh, flags, argc, argv); +} + +PAM_EXTERN int +pam_sm_open_session(pam_handle_t *pamh, int flags, int argc, const char **argv) +{ + return pam_sm_authenticate(pamh, flags, argc, argv); +} + +PAM_EXTERN int +pam_sm_close_session(pam_handle_t *pamh, int flags, int argc, const char **argv) +{ + return pam_sm_authenticate(pamh, flags, argc, argv); +} + +PAM_EXTERN int +pam_sm_chauthtok(pam_handle_t *pamh, int flags, int argc, const char **argv) +{ + return pam_sm_authenticate(pamh, flags, argc, argv); +} + +/* static module data */ +#ifdef PAM_STATIC +struct pam_module _pam_succeed_if_modstruct = { + "pam_succeed_if", + pam_sm_authenticate, + pam_sm_setcred, + pam_sm_acct_mgmt, + pam_sm_open_session, + pam_sm_close_session, + pam_sm_chauthtok +}; +#endif diff --git a/modules/pam_succeed_if/tst-pam_succeed_if b/modules/pam_succeed_if/tst-pam_succeed_if new file mode 100755 index 00000000..f2b6dd3f --- /dev/null +++ b/modules/pam_succeed_if/tst-pam_succeed_if @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_succeed_if.so diff --git a/modules/pam_tally/Makefile.am b/modules/pam_tally/Makefile.am new file mode 100644 index 00000000..c4c181a9 --- /dev/null +++ b/modules/pam_tally/Makefile.am @@ -0,0 +1,36 @@ +# +# Copyright (c) 2005, 2006, 2007 Thorsten Kukuk <kukuk@thkukuk.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README $(MANS) $(XMLS) tst-pam_tally + +man_MANS = pam_tally.8 +XMLS = README.xml pam_tally.8.xml + +TESTS = tst-pam_tally + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +noinst_HEADERS = faillog.h + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include + +pam_tally_la_LDFLAGS = -no-undefined -avoid-version -module +pam_tally_la_LIBADD = -L$(top_builddir)/libpam -lpam +if HAVE_VERSIONING + pam_tally_la_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_tally.la +sbin_PROGRAMS = pam_tally + +pam_tally_SOURCES = pam_tally_app.c + +if ENABLE_REGENERATE_MAN +noinst_DATA = README +README: pam_tally.8.xml +-include $(top_srcdir)/Make.xml.rules +endif diff --git a/modules/pam_tally/Makefile.in b/modules/pam_tally/Makefile.in new file mode 100644 index 00000000..ad8ce4af --- /dev/null +++ b/modules/pam_tally/Makefile.in @@ -0,0 +1,718 @@ +# Makefile.in generated by automake 1.10.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY, to the 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a/modules/pam_tally/README b/modules/pam_tally/README new file mode 100644 index 00000000..d3bf5354 --- /dev/null +++ b/modules/pam_tally/README @@ -0,0 +1,132 @@ +pam_tally — The login counter (tallying) module + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +This module maintains a count of attempted accesses, can reset count on +success, can deny access if too many attempts fail. + +pam_tally comes in two parts: pam_tally.so and pam_tally. The former is the PAM +module and the latter, a stand-alone program. pam_tally is an (optional) +application which can be used to interrogate and manipulate the counter file. +It can display users' counts, set individual counts, or clear all counts. +Setting artificially high counts may be useful for blocking users without +changing their passwords. For example, one might find it useful to clear all +counts every midnight from a cron job. The faillog(8) command can be used +instead of pam_tally to to maintain the counter file. + +Normally, failed attempts to access root will not cause the root account to +become blocked, to prevent denial-of-service: if your users aren't given shell +accounts and root may only login via su or at the machine console (not telnet/ +rsh, etc), this is safe. + +OPTIONS + +GLOBAL OPTIONS + + This can be used for auth and account services. + + onerr=[fail|succeed] + + If something weird happens (like unable to open the file), return with + PAM_SUCESS if onerr=succeed is given, else with the corresponding PAM + error code. + + file=/path/to/counter + + File where to keep counts. Default is /var/log/faillog. + + audit + + Will log the user name into the system log if the user is not found. + +AUTH OPTIONS + + Authentication phase first checks if user should be denied access and if + not it increments attempted login counter. Then on call to pam_setcred(3) + it resets the attempts counter. + + deny=n + + Deny access if tally for this user exceeds n. + + lock_time=n + + Always deny for n seconds after failed attempt. + + unlock_time=n + + Allow access after n seconds after failed attempt. If this option is + used the user will be locked out for the specified amount of time after + he exceeded his maximum allowed attempts. Otherwise the account is + locked until the lock is removed by a manual intervention of the system + administrator. + + magic_root + + If the module is invoked by a user with uid=0 the counter is not + incremented. The sys-admin should use this for user launched services, + like su, otherwise this argument should be omitted. + + no_lock_time + + Do not use the .fail_locktime field in /var/log/faillog for this user. + + no_reset + + Don't reset count on successful entry, only decrement. + + even_deny_root_account + + Root account can become unavailable. + + per_user + + If /var/log/faillog contains a non-zero .fail_max/.fail_locktime field + for this user then use it instead of deny=n/ lock_time=n parameter. + + no_lock_time + + Don't use .fail_locktime filed in /var/log/faillog for this user. + +ACCOUNT OPTIONS + + Account phase resets attempts counter if the user is not magic root. This + phase can be used optionaly for services which don't call pam_setcred(3) + correctly or if the reset should be done regardless of the failure of the + account phase of other modules. + + magic_root + + If the module is invoked by a user with uid=0 the counter is not + incremented. The sys-admin should use this for user launched services, + like su, otherwise this argument should be omitted. + + no_reset + + Don't reset count on successful entry, only decrement. + +EXAMPLES + +Add the following line to /etc/pam.d/login to lock the account after too many +failed logins. The number of allowed fails is specified by /var/log/faillog and +needs to be set with pam_tally or faillog(8) before. + +auth required pam_securetty.so +auth required pam_tally.so per_user +auth required pam_env.so +auth required pam_unix.so +auth required pam_nologin.so +account required pam_unix.so +password required pam_unix.so +session required pam_limits.so +session required pam_unix.so +session required pam_lastlog.so nowtmp +session optional pam_mail.so standard + + +AUTHOR + +pam_tally was written by Tim Baverstock and Tomas Mraz. + diff --git a/modules/pam_tally/README.xml b/modules/pam_tally/README.xml new file mode 100644 index 00000000..3c6de50e --- /dev/null +++ b/modules/pam_tally/README.xml @@ -0,0 +1,41 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_tally.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_tally.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_tally-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_tally.8.xml" xpointer='xpointer(//refsect1[@id = "pam_tally-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_tally.8.xml" xpointer='xpointer(//refsect1[@id = "pam_tally-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_tally.8.xml" xpointer='xpointer(//refsect1[@id = "pam_tally-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_tally.8.xml" xpointer='xpointer(//refsect1[@id = "pam_tally-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_tally/faillog.h b/modules/pam_tally/faillog.h new file mode 100644 index 00000000..0f16261b --- /dev/null +++ b/modules/pam_tally/faillog.h @@ -0,0 +1,55 @@ +/* + * Copyright 1989 - 1994, Julianne Frances Haugh + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of Julianne F. Haugh nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +/* + * faillog.h - login failure logging file format + * + * $Id: faillog.h,v 1.1.1.1 2000/06/20 22:11:59 agmorgan Exp $ + * + * The login failure file is maintained by login(1) and faillog(8) + * Each record in the file represents a separate UID and the file + * is indexed in that fashion. + */ + +#ifndef _FAILLOG_H +#define _FAILLOG_H + +struct faillog { + short fail_cnt; /* failures since last success */ + short fail_max; /* failures before turning account off */ + char fail_line[12]; /* last failure occured here */ + time_t fail_time; /* last failure occured then */ + /* + * If nonzero, the account will be re-enabled if there are no + * failures for fail_locktime seconds since last failure. + */ + long fail_locktime; +}; + +#endif diff --git a/modules/pam_tally/pam_tally.8 b/modules/pam_tally/pam_tally.8 new file mode 100644 index 00000000..205b7663 --- /dev/null +++ b/modules/pam_tally/pam_tally.8 @@ -0,0 +1,221 @@ +.\" Title: pam_tally +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_TALLY" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_tally - The login counter (tallying) module +.SH "SYNOPSIS" +.HP 13 +\fBpam_tally\.so\fR [file=\fI/path/to/counter\fR] [onerr=[\fIfail\fR|\fIsucceed\fR]] [magic_root] [even_deny_root_account] [deny=\fIn\fR] [lock_time=\fIn\fR] [unlock_time=\fIn\fR] [per_user] [no_lock_time] [no_reset] [audit] +.HP 10 +\fBpam_tally\fR [\-\-file\ \fI/path/to/counter\fR] [\-\-user\ \fIusername\fR] [\-\-reset[=\fIn\fR]] [\-\-quiet] +.SH "DESCRIPTION" +.PP +This module maintains a count of attempted accesses, can reset count on success, can deny access if too many attempts fail\. +.PP +pam_tally comes in two parts: +\fBpam_tally\.so\fR +and +\fBpam_tally\fR\. The former is the PAM module and the latter, a stand\-alone program\. +\fBpam_tally\fR +is an (optional) application which can be used to interrogate and manipulate the counter file\. It can display users\' counts, set individual counts, or clear all counts\. Setting artificially high counts may be useful for blocking users without changing their passwords\. For example, one might find it useful to clear all counts every midnight from a cron job\. The +\fBfaillog\fR(8) +command can be used instead of pam_tally to to maintain the counter file\. +.PP +Normally, failed attempts to access +\fIroot\fR +will +\fBnot\fR +cause the root account to become blocked, to prevent denial\-of\-service: if your users aren\'t given shell accounts and root may only login via +\fBsu\fR +or at the machine console (not telnet/rsh, etc), this is safe\. +.SH "OPTIONS" +.PP +GLOBAL OPTIONS +.RS 4 +This can be used for +\fIauth\fR +and +\fIaccount\fR +services\. +.PP +\fBonerr=[\fR\fB\fIfail\fR\fR\fB|\fR\fB\fIsucceed\fR\fR\fB]\fR +.RS 4 +If something weird happens (like unable to open the file), return with +\fBPAM_SUCESS\fR +if +\fBonerr=\fR\fB\fIsucceed\fR\fR +is given, else with the corresponding PAM error code\. +.RE +.PP +\fBfile=\fR\fB\fI/path/to/counter\fR\fR +.RS 4 +File where to keep counts\. Default is +\fI/var/log/faillog\fR\. +.RE +.PP +\fBaudit\fR +.RS 4 +Will log the user name into the system log if the user is not found\. +.RE +.RE +.PP +AUTH OPTIONS +.RS 4 +Authentication phase first checks if user should be denied access and if not it increments attempted login counter\. Then on call to +\fBpam_setcred\fR(3) +it resets the attempts counter\. +.PP +\fBdeny=\fR\fB\fIn\fR\fR +.RS 4 +Deny access if tally for this user exceeds +\fIn\fR\. +.RE +.PP +\fBlock_time=\fR\fB\fIn\fR\fR +.RS 4 +Always deny for +\fIn\fR +seconds after failed attempt\. +.RE +.PP +\fBunlock_time=\fR\fB\fIn\fR\fR +.RS 4 +Allow access after +\fIn\fR +seconds after failed attempt\. If this option is used the user will be locked out for the specified amount of time after he exceeded his maximum allowed attempts\. Otherwise the account is locked until the lock is removed by a manual intervention of the system administrator\. +.RE +.PP +\fBmagic_root\fR +.RS 4 +If the module is invoked by a user with uid=0 the counter is not incremented\. The sys\-admin should use this for user launched services, like +\fBsu\fR, otherwise this argument should be omitted\. +.RE +.PP +\fBno_lock_time\fR +.RS 4 +Do not use the \.fail_locktime field in +\fI/var/log/faillog\fR +for this user\. +.RE +.PP +\fBno_reset\fR +.RS 4 +Don\'t reset count on successful entry, only decrement\. +.RE +.PP +\fBeven_deny_root_account\fR +.RS 4 +Root account can become unavailable\. +.RE +.PP +\fBper_user\fR +.RS 4 +If +\fI/var/log/faillog\fR +contains a non\-zero \.fail_max/\.fail_locktime field for this user then use it instead of +\fBdeny=\fR\fB\fIn\fR\fR/ +\fBlock_time=\fR\fB\fIn\fR\fR +parameter\. +.RE +.PP +\fBno_lock_time\fR +.RS 4 +Don\'t use \.fail_locktime filed in +\fI/var/log/faillog\fR +for this user\. +.RE +.RE +.PP +ACCOUNT OPTIONS +.RS 4 +Account phase resets attempts counter if the user is +\fBnot\fR +magic root\. This phase can be used optionaly for services which don\'t call +\fBpam_setcred\fR(3) +correctly or if the reset should be done regardless of the failure of the account phase of other modules\. +.PP +\fBmagic_root\fR +.RS 4 +If the module is invoked by a user with uid=0 the counter is not incremented\. The sys\-admin should use this for user launched services, like +\fBsu\fR, otherwise this argument should be omitted\. +.RE +.PP +\fBno_reset\fR +.RS 4 +Don\'t reset count on successful entry, only decrement\. +.RE +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +The +\fBauth\fR +and +\fBaccount\fR +services are supported\. +.SH "RETURN VALUES" +.PP +PAM_AUTH_ERR +.RS 4 +A invalid option was given, the module was not able to retrive the user name, no valid counter file was found, or too many failed logins\. +.RE +.PP +PAM_SUCCESS +.RS 4 +Everything was successfull\. +.RE +.PP +PAM_USER_UNKNOWN +.RS 4 +User not known\. +.RE +.SH "EXAMPLES" +.PP +Add the following line to +\fI/etc/pam\.d/login\fR +to lock the account after too many failed logins\. The number of allowed fails is specified by +\fI/var/log/faillog\fR +and needs to be set with pam_tally or +\fBfaillog\fR(8) +before\. +.sp +.RS 4 +.nf +auth required pam_securetty\.so +auth required pam_tally\.so per_user +auth required pam_env\.so +auth required pam_unix\.so +auth required pam_nologin\.so +account required pam_unix\.so +password required pam_unix\.so +session required pam_limits\.so +session required pam_unix\.so +session required pam_lastlog\.so nowtmp +session optional pam_mail\.so standard + +.fi +.RE +.SH "FILES" +.PP +\fI/var/log/faillog\fR +.RS 4 +failure logging file +.RE +.SH "SEE ALSO" +.PP + +\fBfaillog\fR(8), +\fBpam.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_tally was written by Tim Baverstock and Tomas Mraz\. diff --git a/modules/pam_tally/pam_tally.8.xml b/modules/pam_tally/pam_tally.8.xml new file mode 100644 index 00000000..4f89269e --- /dev/null +++ b/modules/pam_tally/pam_tally.8.xml @@ -0,0 +1,427 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_tally"> + + <refmeta> + <refentrytitle>pam_tally</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_tally-name"> + <refname>pam_tally</refname> + <refpurpose>The login counter (tallying) module</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_tally-cmdsynopsis1"> + <command>pam_tally.so</command> + <arg choice="opt"> + file=<replaceable>/path/to/counter</replaceable> + </arg> + <arg choice="opt"> + onerr=[<replaceable>fail</replaceable>|<replaceable>succeed</replaceable>] + </arg> + <arg choice="opt"> + magic_root + </arg> + <arg choice="opt"> + even_deny_root_account + </arg> + <arg choice="opt"> + deny=<replaceable>n</replaceable> + </arg> + <arg choice="opt"> + lock_time=<replaceable>n</replaceable> + </arg> + <arg choice="opt"> + unlock_time=<replaceable>n</replaceable> + </arg> + <arg choice="opt"> + per_user + </arg> + <arg choice="opt"> + no_lock_time + </arg> + <arg choice="opt"> + no_reset + </arg> + <arg choice="opt"> + audit + </arg> + </cmdsynopsis> + <cmdsynopsis id="pam_tally-cmdsynopsis2"> + <command>pam_tally</command> + <arg choice="opt"> + --file <replaceable>/path/to/counter</replaceable> + </arg> + <arg choice="opt"> + --user <replaceable>username</replaceable> + </arg> + <arg choice="opt"> + --reset[=<replaceable>n</replaceable>] + </arg> + <arg choice="opt"> + --quiet + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_tally-description"> + + <title>DESCRIPTION</title> + + <para> + This module maintains a count of attempted accesses, can + reset count on success, can deny access if too many attempts fail. + </para> + <para> + pam_tally comes in two parts: + <emphasis remap='B'>pam_tally.so</emphasis> and + <command>pam_tally</command>. The former is the PAM module and + the latter, a stand-alone program. <command>pam_tally</command> + is an (optional) application which can be used to interrogate and + manipulate the counter file. It can display users' counts, set + individual counts, or clear all counts. Setting artificially high + counts may be useful for blocking users without changing their + passwords. For example, one might find it useful to clear all counts + every midnight from a cron job. The + <citerefentry> + <refentrytitle>faillog</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> command can be used instead of pam_tally to to + maintain the counter file. + </para> + <para> + Normally, failed attempts to access <emphasis>root</emphasis> will + <emphasis remap='B'>not</emphasis> cause the root account to become + blocked, to prevent denial-of-service: if your users aren't given + shell accounts and root may only login via <command>su</command> or + at the machine console (not telnet/rsh, etc), this is safe. + </para> + </refsect1> + + <refsect1 id="pam_tally-options"> + + <title>OPTIONS</title> + <variablelist> + <varlistentry> + <term> + GLOBAL OPTIONS + </term> + <listitem> + <para> + This can be used for <emphasis>auth</emphasis> and + <emphasis>account</emphasis> services. + </para> + <variablelist> + <varlistentry> + <term> + <option>onerr=[<replaceable>fail</replaceable>|<replaceable>succeed</replaceable>]</option> + </term> + <listitem> + <para> + If something weird happens (like unable to open the file), + return with <errorcode>PAM_SUCESS</errorcode> if + <option>onerr=<replaceable>succeed</replaceable></option> + is given, else with the corresponding PAM error code. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>file=<replaceable>/path/to/counter</replaceable></option> + </term> + <listitem> + <para> + File where to keep counts. Default is + <filename>/var/log/faillog</filename>. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>audit</option> + </term> + <listitem> + <para> + Will log the user name into the system log if the user is not found. + </para> + </listitem> + </varlistentry> + </variablelist> + </listitem> + </varlistentry> + + <varlistentry> + <term> + AUTH OPTIONS + </term> + <listitem> + <para> + Authentication phase first checks if user should be denied + access and if not it increments attempted login counter. Then + on call to <citerefentry> + <refentrytitle>pam_setcred</refentrytitle><manvolnum>3</manvolnum> + </citerefentry> it resets the attempts counter. + </para> + <variablelist> + <varlistentry> + <term> + <option>deny=<replaceable>n</replaceable></option> + </term> + <listitem> + <para> + Deny access if tally for this user exceeds + <replaceable>n</replaceable>. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>lock_time=<replaceable>n</replaceable></option> + </term> + <listitem> + <para> + Always deny for <replaceable>n</replaceable> seconds + after failed attempt. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>unlock_time=<replaceable>n</replaceable></option> + </term> + <listitem> + <para> + Allow access after <replaceable>n</replaceable> seconds + after failed attempt. If this option is used the user will + be locked out for the specified amount of time after he + exceeded his maximum allowed attempts. Otherwise the + account is locked until the lock is removed by a manual + intervention of the system administrator. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>magic_root</option> + </term> + <listitem> + <para> + If the module is invoked by a user with uid=0 the + counter is not incremented. The sys-admin should use this + for user launched services, like <command>su</command>, + otherwise this argument should be omitted. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>no_lock_time</option> + </term> + <listitem> + <para> + Do not use the .fail_locktime field in + <filename>/var/log/faillog</filename> for this user. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>no_reset</option> + </term> + <listitem> + <para> + Don't reset count on successful entry, only decrement. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>even_deny_root_account</option> + </term> + <listitem> + <para> + Root account can become unavailable. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>per_user</option> + </term> + <listitem> + <para> + If <filename>/var/log/faillog</filename> contains a non-zero + .fail_max/.fail_locktime field for this user then use it + instead of <option>deny=<replaceable>n</replaceable></option>/ + <option>lock_time=<replaceable>n</replaceable></option> parameter. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>no_lock_time</option> + </term> + <listitem> + <para> + Don't use .fail_locktime filed in + <filename>/var/log/faillog</filename> for this user. + </para> + </listitem> + </varlistentry> + + </variablelist> + </listitem> + </varlistentry> + + + <varlistentry> + <term> + ACCOUNT OPTIONS + </term> + <listitem> + <para> + Account phase resets attempts counter if the user is + <emphasis remap='B'>not</emphasis> magic root. + This phase can be used optionaly for services which don't call + <citerefentry> + <refentrytitle>pam_setcred</refentrytitle><manvolnum>3</manvolnum> + </citerefentry> correctly or if the reset should be done regardless + of the failure of the account phase of other modules. + </para> + <variablelist> + <varlistentry> + <term> + <option>magic_root</option> + </term> + <listitem> + <para> + If the module is invoked by a user with uid=0 the + counter is not incremented. The sys-admin should use this + for user launched services, like <command>su</command>, + otherwise this argument should be omitted. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>no_reset</option> + </term> + <listitem> + <para> + Don't reset count on successful entry, only decrement. + </para> + </listitem> + </varlistentry> + </variablelist> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_tally-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + The <option>auth</option> and <option>account</option> + services are supported. + </para> + </refsect1> + + <refsect1 id='pam_tally-return_values'> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_AUTH_ERR</term> + <listitem> + <para> + A invalid option was given, the module was not able + to retrive the user name, no valid counter file + was found, or too many failed logins. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + Everything was successfull. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_USER_UNKNOWN</term> + <listitem> + <para> + User not known. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id='pam_tally-examples'> + <title>EXAMPLES</title> + <para> + Add the following line to <filename>/etc/pam.d/login</filename> to + lock the account after too many failed logins. The number of + allowed fails is specified by <filename>/var/log/faillog</filename> + and needs to be set with pam_tally or <citerefentry> + <refentrytitle>faillog</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> before. + </para> + <programlisting> +auth required pam_securetty.so +auth required pam_tally.so per_user +auth required pam_env.so +auth required pam_unix.so +auth required pam_nologin.so +account required pam_unix.so +password required pam_unix.so +session required pam_limits.so +session required pam_unix.so +session required pam_lastlog.so nowtmp +session optional pam_mail.so standard + </programlisting> + </refsect1> + + <refsect1 id="pam_tally-files"> + <title>FILES</title> + <variablelist> + <varlistentry> + <term><filename>/var/log/faillog</filename></term> + <listitem> + <para>failure logging file</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id='pam_tally-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>faillog</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_tally-author'> + <title>AUTHOR</title> + <para> + pam_tally was written by Tim Baverstock and Tomas Mraz. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_tally/pam_tally.c b/modules/pam_tally/pam_tally.c new file mode 100644 index 00000000..8814659a --- /dev/null +++ b/modules/pam_tally/pam_tally.c @@ -0,0 +1,867 @@ +/* + * pam_tally.c + * + */ + + +/* By Tim Baverstock <warwick@mmm.co.uk>, Multi Media Machine Ltd. + * 5 March 1997 + * + * Stuff stolen from pam_rootok and pam_listfile + * + * Changes by Tomas Mraz <tmraz@redhat.com> 5 January 2005 + * Audit option added for Tomas patch by + * Sebastien Tricaud <toady@gscore.org> 13 January 2005 + */ + +#include "config.h" + +#include <stdio.h> +#include <string.h> +#include <unistd.h> +#include <stdarg.h> +#include <stdlib.h> +#include <syslog.h> +#include <pwd.h> +#include <time.h> + +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/param.h> +#include "faillog.h" + +/* + * here, we make a definition for the externally accessible function + * in this file (this definition is required for static a module + * but strongly encouraged generally) it is used to instruct the + * modules include file to define the function prototypes. + */ + +#ifndef MAIN +#define PAM_SM_AUTH +#define PAM_SM_ACCOUNT +/* #define PAM_SM_SESSION */ +/* #define PAM_SM_PASSWORD */ + +#include <security/pam_modutil.h> +#include <security/pam_ext.h> +#endif +#include <security/pam_modules.h> + +#ifndef TRUE +#define TRUE 1L +#define FALSE 0L +#endif + +#ifndef HAVE_FSEEKO +#define fseeko fseek +#endif + +/*---------------------------------------------------------------------*/ + +#define DEFAULT_LOGFILE "/var/log/faillog" +#define MODULE_NAME "pam_tally" + +#define tally_t unsigned short int +#define TALLY_FMT "%hu" +#define TALLY_HI ((tally_t)~0L) + +#ifndef FILENAME_MAX +# define FILENAME_MAX MAXPATHLEN +#endif + +struct fail_s { + struct faillog fs_faillog; +#ifndef MAIN + time_t fs_fail_time; +#endif /* ndef MAIN */ +}; + +struct tally_options { + const char *filename; + tally_t deny; + long lock_time; + long unlock_time; + unsigned int ctrl; +}; + +#define PHASE_UNKNOWN 0 +#define PHASE_AUTH 1 +#define PHASE_ACCOUNT 2 +#define PHASE_SESSION 3 + +#define OPT_MAGIC_ROOT 01 +#define OPT_FAIL_ON_ERROR 02 +#define OPT_DENY_ROOT 04 +#define OPT_PER_USER 010 +#define OPT_NO_LOCK_TIME 020 +#define OPT_NO_RESET 040 +#define OPT_AUDIT 0100 + + +/*---------------------------------------------------------------------*/ + +/* some syslogging */ + +#ifdef MAIN +#define pam_syslog tally_log +static void +tally_log (const pam_handle_t *pamh UNUSED, int priority UNUSED, + const char *fmt, ...) +{ + va_list args; + + va_start(args, fmt); + fprintf(stderr, "%s: ", MODULE_NAME); + vfprintf(stderr, fmt, args); + fprintf(stderr,"\n"); + va_end(args); +} + +#define pam_modutil_getpwnam(pamh,user) getpwnam(user) + +#endif + +/*---------------------------------------------------------------------*/ + +/* --- Support function: parse arguments --- */ + +#ifndef MAIN + +static void +log_phase_no_auth(pam_handle_t *pamh, int phase, const char *argv) +{ + if ( phase != PHASE_AUTH ) { + pam_syslog(pamh, LOG_ERR, + "option %s allowed in auth phase only", argv); + } +} + +static int +tally_parse_args(pam_handle_t *pamh, struct tally_options *opts, + int phase, int argc, const char **argv) +{ + memset(opts, 0, sizeof(*opts)); + opts->filename = DEFAULT_LOGFILE; + + for ( ; argc-- > 0; ++argv ) { + + if ( ! strncmp( *argv, "file=", 5 ) ) { + const char *from = *argv + 5; + if ( *from!='/' || strlen(from)>FILENAME_MAX-1 ) { + pam_syslog(pamh, LOG_ERR, + "filename not /rooted or too long; %s", *argv); + return PAM_AUTH_ERR; + } + opts->filename = from; + } + else if ( ! strcmp( *argv, "onerr=fail" ) ) { + opts->ctrl |= OPT_FAIL_ON_ERROR; + } + else if ( ! strcmp( *argv, "onerr=succeed" ) ) { + opts->ctrl &= ~OPT_FAIL_ON_ERROR; + } + else if ( ! strcmp( *argv, "magic_root" ) ) { + opts->ctrl |= OPT_MAGIC_ROOT; + } + else if ( ! strcmp( *argv, "even_deny_root_account" ) ) { + log_phase_no_auth(pamh, phase, *argv); + opts->ctrl |= OPT_DENY_ROOT; + } + else if ( ! strncmp( *argv, "deny=", 5 ) ) { + log_phase_no_auth(pamh, phase, *argv); + if ( sscanf((*argv)+5,TALLY_FMT,&opts->deny) != 1 ) { + pam_syslog(pamh, LOG_ERR, "bad number supplied: %s", *argv); + return PAM_AUTH_ERR; + } + } + else if ( ! strncmp( *argv, "lock_time=", 10 ) ) { + log_phase_no_auth(pamh, phase, *argv); + if ( sscanf((*argv)+10,"%ld",&opts->lock_time) != 1 ) { + pam_syslog(pamh, LOG_ERR, "bad number supplied: %s", *argv); + return PAM_AUTH_ERR; + } + } + else if ( ! strncmp( *argv, "unlock_time=", 12 ) ) { + log_phase_no_auth(pamh, phase, *argv); + if ( sscanf((*argv)+12,"%ld",&opts->unlock_time) != 1 ) { + pam_syslog(pamh, LOG_ERR, "bad number supplied: %s", *argv); + return PAM_AUTH_ERR; + } + } + else if ( ! strcmp( *argv, "per_user" ) ) + { + log_phase_no_auth(pamh, phase, *argv); + opts->ctrl |= OPT_PER_USER; + } + else if ( ! strcmp( *argv, "no_lock_time") ) + { + log_phase_no_auth(pamh, phase, *argv); + opts->ctrl |= OPT_NO_LOCK_TIME; + } + else if ( ! strcmp( *argv, "no_reset" ) ) { + opts->ctrl |= OPT_NO_RESET; + } + else if ( ! strcmp ( *argv, "audit") ) { + opts->ctrl |= OPT_AUDIT; + } + else { + pam_syslog(pamh, LOG_ERR, "unknown option: %s", *argv); + } + } + + return PAM_SUCCESS; +} + +#endif /* #ifndef MAIN */ + +/*---------------------------------------------------------------------*/ + +/* --- Support function: get uid (and optionally username) from PAM or + cline_user --- */ + +#ifdef MAIN +static char *cline_user=0; /* cline_user is used in the administration prog */ +#endif + +static int +pam_get_uid(pam_handle_t *pamh, uid_t *uid, const char **userp, struct tally_options *opts) +{ + const char *user = NULL; + struct passwd *pw; + +#ifdef MAIN + user = cline_user; +#else + if ((pam_get_user( pamh, &user, NULL )) != PAM_SUCCESS) { + pam_syslog(pamh, LOG_ERR, "pam_get_user; user?"); + return PAM_AUTH_ERR; + } +#endif + + if ( !user || !*user ) { + pam_syslog(pamh, LOG_ERR, "pam_get_uid; user?"); + return PAM_AUTH_ERR; + } + + if ( ! ( pw = pam_modutil_getpwnam( pamh, user ) ) ) { + opts->ctrl & OPT_AUDIT ? + pam_syslog(pamh, LOG_ERR, "pam_get_uid; no such user %s", user) : + pam_syslog(pamh, LOG_ERR, "pam_get_uid; no such user"); + return PAM_USER_UNKNOWN; + } + + if ( uid ) *uid = pw->pw_uid; + if ( userp ) *userp = user; + return PAM_SUCCESS; +} + +/*---------------------------------------------------------------------*/ + +/* --- Support functions: set/get tally data --- */ + +#ifndef MAIN + +static void +_cleanup(pam_handle_t *pamh UNUSED, void *data, int error_status UNUSED) +{ + free(data); +} + + +static void +tally_set_data( pam_handle_t *pamh, time_t oldtime ) +{ + time_t *data; + + if ( (data=malloc(sizeof(time_t))) != NULL ) { + *data = oldtime; + pam_set_data(pamh, MODULE_NAME, (void *)data, _cleanup); + } +} + +static int +tally_get_data( pam_handle_t *pamh, time_t *oldtime ) +{ + int rv; + const void *data; + + rv = pam_get_data(pamh, MODULE_NAME, &data); + if ( rv == PAM_SUCCESS && data != NULL && oldtime != NULL ) { + *oldtime = *(const time_t *)data; + pam_set_data(pamh, MODULE_NAME, NULL, NULL); + } + else { + rv = -1; + if (oldtime) + *oldtime = 0; + } + return rv; +} +#endif /* #ifndef MAIN */ + +/*---------------------------------------------------------------------*/ + +/* --- Support function: open/create tallyfile and return tally for uid --- */ + +/* If on entry *tally==TALLY_HI, tallyfile is opened READONLY */ +/* Otherwise, if on entry tallyfile doesn't exist, creation is attempted. */ + +static int +get_tally(pam_handle_t *pamh, tally_t *tally, uid_t uid, + const char *filename, FILE **TALLY, struct fail_s *fsp) +{ + struct stat fileinfo; + int lstat_ret = lstat(filename,&fileinfo); + + if ( lstat_ret && *tally!=TALLY_HI ) { + int oldmask = umask(077); + *TALLY=fopen(filename, "a"); + /* Create file, or append-open in pathological case. */ + umask(oldmask); + if ( !*TALLY ) { + pam_syslog(pamh, LOG_ALERT, "Couldn't create %s", filename); + return PAM_AUTH_ERR; + } + lstat_ret = fstat(fileno(*TALLY),&fileinfo); + fclose(*TALLY); + } + + if ( lstat_ret ) { + pam_syslog(pamh, LOG_ALERT, "Couldn't stat %s", filename); + return PAM_AUTH_ERR; + } + + if((fileinfo.st_mode & S_IWOTH) || !S_ISREG(fileinfo.st_mode)) { + /* If the file is world writable or is not a + normal file, return error */ + pam_syslog(pamh, LOG_ALERT, + "%s is either world writable or not a normal file", + filename); + return PAM_AUTH_ERR; + } + + if ( ! ( *TALLY = fopen(filename,(*tally!=TALLY_HI)?"r+":"r") ) ) { + pam_syslog(pamh, LOG_ALERT, "Error opening %s for update", filename); + +/* Discovering why account service fails: e/uid are target user. + * + * perror(MODULE_NAME); + * fprintf(stderr,"uid %d euid %d\n",getuid(), geteuid()); + */ + return PAM_AUTH_ERR; + } + + if ( fseeko( *TALLY, (off_t) uid * sizeof(struct faillog), SEEK_SET ) ) { + pam_syslog(pamh, LOG_ALERT, "fseek failed for %s", filename); + fclose(*TALLY); + return PAM_AUTH_ERR; + } + + if ( (size_t)fileinfo.st_size <= uid * sizeof(struct faillog) ) { + + memset(fsp, 0, sizeof(struct faillog)); + *tally=0; + fsp->fs_faillog.fail_time = time(NULL); + + } else if (( fread((char *) &fsp->fs_faillog, + sizeof(struct faillog), 1, *TALLY) )==0 ) { + + *tally=0; /* Assuming a gappy filesystem */ + + } else { + + *tally = fsp->fs_faillog.fail_cnt; + + } + + return PAM_SUCCESS; +} + +/*---------------------------------------------------------------------*/ + +/* --- Support function: update and close tallyfile with tally!=TALLY_HI --- */ + +static int +set_tally(pam_handle_t *pamh, tally_t tally, uid_t uid, + const char *filename, FILE **TALLY, struct fail_s *fsp) +{ + int retval = PAM_SUCCESS; + + if ( tally!=TALLY_HI ) { + if ( fseeko( *TALLY, (off_t) uid * sizeof(struct faillog), SEEK_SET ) ) { + pam_syslog(pamh, LOG_ALERT, "fseek failed for %s", filename); + retval = PAM_AUTH_ERR; + } else { + fsp->fs_faillog.fail_cnt = tally; + if (fwrite((char *) &fsp->fs_faillog, + sizeof(struct faillog), 1, *TALLY)==0 ) { + pam_syslog(pamh, LOG_ALERT, "update (fwrite) failed for %s", filename); + retval = PAM_AUTH_ERR; + } + } + } + + if ( fclose(*TALLY) ) { + pam_syslog(pamh, LOG_ALERT, "update (fclose) failed for %s", filename); + return PAM_AUTH_ERR; + } + *TALLY=NULL; + return retval; +} + +/*---------------------------------------------------------------------*/ + +/* --- PAM bits --- */ + +#ifndef MAIN + +#define RETURN_ERROR(i) return ((opts->ctrl & OPT_FAIL_ON_ERROR)?(i):(PAM_SUCCESS)) + +/*---------------------------------------------------------------------*/ + +/* --- tally bump function: bump tally for uid by (signed) inc --- */ + +static int +tally_bump (int inc, time_t *oldtime, pam_handle_t *pamh, + uid_t uid, const char *user, struct tally_options *opts) +{ + tally_t + tally = 0; /* !TALLY_HI --> Log opened for update */ + + FILE + *TALLY = NULL; + const void + *remote_host = NULL, + *cur_tty = NULL; + struct fail_s fs, *fsp = &fs; + int i; + + i=get_tally(pamh, &tally, uid, opts->filename, &TALLY, fsp); + if ( i != PAM_SUCCESS ) { RETURN_ERROR( i ); } + + /* to remember old fail time (for locktime) */ + fsp->fs_fail_time = fsp->fs_faillog.fail_time; + if ( inc > 0 ) { + if ( oldtime ) { + *oldtime = fsp->fs_faillog.fail_time; + } + fsp->fs_faillog.fail_time = time(NULL); + } else { + if ( oldtime ) { + fsp->fs_faillog.fail_time = *oldtime; + } + } + (void) pam_get_item(pamh, PAM_RHOST, &remote_host); + if (!remote_host) { + + (void) pam_get_item(pamh, PAM_TTY, &cur_tty); + if (!cur_tty) { + strncpy(fsp->fs_faillog.fail_line, "unknown", + sizeof(fsp->fs_faillog.fail_line) - 1); + fsp->fs_faillog.fail_line[sizeof(fsp->fs_faillog.fail_line)-1] = 0; + } else { + strncpy(fsp->fs_faillog.fail_line, cur_tty, + sizeof(fsp->fs_faillog.fail_line)-1); + fsp->fs_faillog.fail_line[sizeof(fsp->fs_faillog.fail_line)-1] = 0; + } + + } else { + strncpy(fsp->fs_faillog.fail_line, remote_host, + (size_t)sizeof(fsp->fs_faillog.fail_line)); + fsp->fs_faillog.fail_line[sizeof(fsp->fs_faillog.fail_line)-1] = 0; + } + + if ( !(opts->ctrl & OPT_MAGIC_ROOT) || getuid() ) { /* magic_root doesn't change tally */ + + tally+=inc; + + if ( tally==TALLY_HI ) { /* Overflow *and* underflow. :) */ + tally-=inc; + pam_syslog(pamh, LOG_ALERT, "Tally %sflowed for user %s", + (inc<0)?"under":"over",user); + } + } + + i=set_tally(pamh, tally, uid, opts->filename, &TALLY, fsp ); + if ( i != PAM_SUCCESS ) { RETURN_ERROR( i ); } + + return PAM_SUCCESS; +} + +static int +tally_check (time_t oldtime, pam_handle_t *pamh, uid_t uid, + const char *user, struct tally_options *opts) +{ + tally_t + deny = opts->deny; + tally_t + tally = 0; /* !TALLY_HI --> Log opened for update */ + long + lock_time = opts->lock_time; + + struct fail_s fs, *fsp = &fs; + FILE *TALLY=0; + int i; + + i=get_tally(pamh, &tally, uid, opts->filename, &TALLY, fsp); + if ( i != PAM_SUCCESS ) { RETURN_ERROR( i ); } + + if ( !(opts->ctrl & OPT_MAGIC_ROOT) || getuid() ) { /* magic_root skips tally check */ + + /* To deny or not to deny; that is the question */ + + /* if there's .fail_max entry and per_user=TRUE then deny=.fail_max */ + + if ( (fsp->fs_faillog.fail_max) && (opts->ctrl & OPT_PER_USER) ) { + deny = fsp->fs_faillog.fail_max; + } + if ( (fsp->fs_faillog.fail_locktime) && (opts->ctrl & OPT_PER_USER) ) { + lock_time = fsp->fs_faillog.fail_locktime; + } + if (lock_time && oldtime + && !(opts->ctrl & OPT_NO_LOCK_TIME) ) + { + if ( lock_time + oldtime > time(NULL) ) + { + pam_syslog(pamh, LOG_NOTICE, + "user %s (%lu) has time limit [%lds left]" + " since last failure.", + user, (unsigned long int) uid, + oldtime+lock_time + -time(NULL)); + return PAM_AUTH_ERR; + } + } + if (opts->unlock_time && oldtime) + { + if ( opts->unlock_time + oldtime <= time(NULL) ) + { /* ignore deny check after unlock_time elapsed */ + return PAM_SUCCESS; + } + } + if ( + ( deny != 0 ) && /* deny==0 means no deny */ + ( tally > deny ) && /* tally>deny means exceeded */ + ( ((opts->ctrl & OPT_DENY_ROOT) || uid) ) /* even_deny stops uid check */ + ) { + pam_syslog(pamh, LOG_NOTICE, + "user %s (%lu) tally "TALLY_FMT", deny "TALLY_FMT, + user, (unsigned long int) uid, tally, deny); + return PAM_AUTH_ERR; /* Only unconditional failure */ + } + } + + return PAM_SUCCESS; +} + +static int +tally_reset (pam_handle_t *pamh, uid_t uid, struct tally_options *opts) +{ + tally_t + tally = 0; /* !TALLY_HI --> Log opened for update */ + + struct fail_s fs, *fsp = &fs; + FILE *TALLY=0; + int i; + + i=get_tally(pamh, &tally, uid, opts->filename, &TALLY, fsp); + if ( i != PAM_SUCCESS ) { RETURN_ERROR( i ); } + + /* resets if not magic root + */ + + if ( (!(opts->ctrl & OPT_MAGIC_ROOT) || getuid()) + && !(opts->ctrl & OPT_NO_RESET) ) + { tally=0; } + + if (tally == 0) + { + fsp->fs_faillog.fail_time = (time_t) 0; + strcpy(fsp->fs_faillog.fail_line, ""); + } + + i=set_tally(pamh, tally, uid, opts->filename, &TALLY, fsp); + if ( i != PAM_SUCCESS ) { RETURN_ERROR( i ); } + + return PAM_SUCCESS; +} + +/*---------------------------------------------------------------------*/ + +/* --- authentication management functions (only) --- */ + +#ifdef PAM_SM_AUTH + +PAM_EXTERN int +pam_sm_authenticate(pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + int + rvcheck, rvbump; + time_t + oldtime = 0; + struct tally_options + options, *opts = &options; + uid_t + uid; + const char + *user; + + rvcheck = tally_parse_args(pamh, opts, PHASE_AUTH, argc, argv); + if ( rvcheck != PAM_SUCCESS ) + RETURN_ERROR( rvcheck ); + + rvcheck = pam_get_uid(pamh, &uid, &user, opts); + if ( rvcheck != PAM_SUCCESS ) + RETURN_ERROR( rvcheck ); + + rvbump = tally_bump(1, &oldtime, pamh, uid, user, opts); + rvcheck = tally_check(oldtime, pamh, uid, user, opts); + + tally_set_data(pamh, oldtime); + + return rvcheck != PAM_SUCCESS ? rvcheck : rvbump; +} + +PAM_EXTERN int +pam_sm_setcred(pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + int + rv; + time_t + oldtime = 0; + struct tally_options + options, *opts = &options; + uid_t + uid; + const char + *user; + + rv = tally_parse_args(pamh, opts, PHASE_AUTH, argc, argv); + if ( rv != PAM_SUCCESS ) + RETURN_ERROR( rv ); + + rv = pam_get_uid(pamh, &uid, &user, opts); + if ( rv != PAM_SUCCESS ) + RETURN_ERROR( rv ); + + if ( tally_get_data(pamh, &oldtime) != 0 ) + /* no data found */ + return PAM_SUCCESS; + + if ( (rv=tally_bump(-1, &oldtime, pamh, uid, user, opts)) != PAM_SUCCESS ) + return rv; + return tally_reset(pamh, uid, opts); +} + +#endif + +/*---------------------------------------------------------------------*/ + +/* --- authentication management functions (only) --- */ + +#ifdef PAM_SM_ACCOUNT + +/* To reset failcount of user on successfull login */ + +PAM_EXTERN int +pam_sm_acct_mgmt(pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + int + rv; + time_t + oldtime = 0; + struct tally_options + options, *opts = &options; + uid_t + uid; + const char + *user; + + rv = tally_parse_args(pamh, opts, PHASE_ACCOUNT, argc, argv); + if ( rv != PAM_SUCCESS ) + RETURN_ERROR( rv ); + + rv = pam_get_uid(pamh, &uid, &user, opts); + if ( rv != PAM_SUCCESS ) + RETURN_ERROR( rv ); + + if ( tally_get_data(pamh, &oldtime) != 0 ) + /* no data found */ + return PAM_SUCCESS; + + if ( (rv=tally_bump(-1, &oldtime, pamh, uid, user, opts)) != PAM_SUCCESS ) + return rv; + return tally_reset(pamh, uid, opts); +} + +#endif /* #ifdef PAM_SM_ACCOUNT */ + +/*-----------------------------------------------------------------------*/ + +#ifdef PAM_STATIC + +/* static module data */ + +struct pam_module _pam_tally_modstruct = { + MODULE_NAME, +#ifdef PAM_SM_AUTH + pam_sm_authenticate, + pam_sm_setcred, +#else + NULL, + NULL, +#endif +#ifdef PAM_SM_ACCOUNT + pam_sm_acct_mgmt, +#else + NULL, +#endif + NULL, + NULL, + NULL, +}; + +#endif /* #ifdef PAM_STATIC */ + +/*-----------------------------------------------------------------------*/ + +#else /* #ifndef MAIN */ + +static const char *cline_filename = DEFAULT_LOGFILE; +static tally_t cline_reset = TALLY_HI; /* Default is `interrogate only' */ +static int cline_quiet = 0; + +/* + * Not going to link with pamlib just for these.. :) + */ + +static const char * +pam_errors( int i ) +{ + switch (i) { + case PAM_AUTH_ERR: return _("Authentication error"); + case PAM_SERVICE_ERR: return _("Service error"); + case PAM_USER_UNKNOWN: return _("Unknown user"); + default: return _("Unknown error"); + } +} + +static int +getopts( char **argv ) +{ + const char *pname = *argv; + for ( ; *argv ; (void)(*argv && ++argv) ) { + if ( !strcmp (*argv,"--file") ) cline_filename=*++argv; + else if ( !strncmp(*argv,"--file=",7) ) cline_filename=*argv+7; + else if ( !strcmp (*argv,"--user") ) cline_user=*++argv; + else if ( !strncmp(*argv,"--user=",7) ) cline_user=*argv+7; + else if ( !strcmp (*argv,"--reset") ) cline_reset=0; + else if ( !strncmp(*argv,"--reset=",8)) { + if ( sscanf(*argv+8,TALLY_FMT,&cline_reset) != 1 ) + fprintf(stderr,_("%s: Bad number given to --reset=\n"),pname), exit(0); + } + else if ( !strcmp (*argv,"--quiet") ) cline_quiet=1; + else { + fprintf(stderr,_("%s: Unrecognised option %s\n"),pname,*argv); + return FALSE; + } + } + return TRUE; +} + +int main ( int argc UNUSED, char **argv ) +{ + struct fail_s fs, *fsp = &fs; + + if ( ! getopts( argv+1 ) ) { + printf(_("%s: [--file rooted-filename] [--user username] " + "[--reset[=n]] [--quiet]\n"), + *argv); + exit(0); + } + + umask(077); + + /* + * Major difference between individual user and all users: + * --user just handles one user, just like PAM. + * --user=* handles all users, sniffing cline_filename for nonzeros + */ + + if ( cline_user ) { + uid_t uid; + tally_t tally=cline_reset; + FILE *TALLY=0; + struct tally_options opts; + int i; + + memset(&opts, 0, sizeof(opts)); + opts.ctrl = OPT_AUDIT; + i=pam_get_uid(NULL, &uid, NULL, &opts); + if ( i != PAM_SUCCESS ) { + fprintf(stderr,"%s: %s\n",*argv,pam_errors(i)); + exit(0); + } + + i=get_tally(NULL, &tally, uid, cline_filename, &TALLY, fsp); + if ( i != PAM_SUCCESS ) { + fprintf(stderr,"%s: %s\n",*argv,pam_errors(i)); + exit(0); + } + + if ( !cline_quiet ) + printf("User %s\t(%lu)\t%s "TALLY_FMT"\n",cline_user, + (unsigned long int) uid, + (cline_reset!=TALLY_HI)?"had":"has",tally); + + i=set_tally(NULL, cline_reset, uid, cline_filename, &TALLY, fsp); + if ( i != PAM_SUCCESS ) { + fprintf(stderr,"%s: %s\n",*argv,pam_errors(i)); + exit(0); + } + } + else /* !cline_user (ie, operate on all users) */ { + FILE *TALLY=fopen(cline_filename, "r"); + uid_t uid=0; + if ( !TALLY ) perror(*argv), exit(0); + + for ( ; !feof(TALLY); uid++ ) { + tally_t tally; + struct passwd *pw; + if ( ! fread((char *) &fsp->fs_faillog, + sizeof (struct faillog), 1, TALLY) + || ! fsp->fs_faillog.fail_cnt ) { + continue; + } + tally = fsp->fs_faillog.fail_cnt; + + if ( ( pw=getpwuid(uid) ) ) { + printf("User %s\t(%lu)\t%s "TALLY_FMT"\n",pw->pw_name, + (unsigned long int) uid, + (cline_reset!=TALLY_HI)?"had":"has",tally); + } + else { + printf("User [NONAME]\t(%lu)\t%s "TALLY_FMT"\n", + (unsigned long int) uid, + (cline_reset!=TALLY_HI)?"had":"has",tally); + } + } + fclose(TALLY); + if ( cline_reset!=0 && cline_reset!=TALLY_HI ) { + fprintf(stderr,_("%s: Can't reset all users to non-zero\n"),*argv); + } + else if ( !cline_reset ) { + TALLY=fopen(cline_filename, "w"); + if ( !TALLY ) perror(*argv), exit(0); + fclose(TALLY); + } + } + return 0; +} + + +#endif /* #ifndef MAIN */ diff --git a/modules/pam_tally/pam_tally_app.c b/modules/pam_tally/pam_tally_app.c new file mode 100644 index 00000000..9e6e1faf --- /dev/null +++ b/modules/pam_tally/pam_tally_app.c @@ -0,0 +1,7 @@ +/* + # This seemed like such a good idea at the time. :) + */ + +#define MAIN +#include "pam_tally.c" + diff --git a/modules/pam_tally/tst-pam_tally b/modules/pam_tally/tst-pam_tally new file mode 100755 index 00000000..15291af6 --- /dev/null +++ b/modules/pam_tally/tst-pam_tally @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_tally.so diff --git a/modules/pam_time/Makefile.am b/modules/pam_time/Makefile.am new file mode 100644 index 00000000..9c63ee5e --- /dev/null +++ b/modules/pam_time/Makefile.am @@ -0,0 +1,32 @@ +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README $(MANS) $(XMLS) time.conf tst-pam_time + +man_MANS = time.conf.5 pam_time.8 +XMLS = README.xml time.conf.5.xml pam_time.8.xml + +TESTS = tst-pam_time + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include \ + -DPAM_TIME_CONF=\"$(SCONFIGDIR)/time.conf\" +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif +pam_time_la_LIBADD = -L$(top_builddir)/libpam -lpam + +securelib_LTLIBRARIES = pam_time.la +secureconf_DATA = time.conf + +if ENABLE_REGENERATE_MAN +noinst_DATA = README +README: pam_time.8.xml time.conf.5.xml +-include $(top_srcdir)/Make.xml.rules +endif diff --git a/modules/pam_time/Makefile.in b/modules/pam_time/Makefile.in new file mode 100644 index 00000000..c33bd0d9 --- /dev/null +++ b/modules/pam_time/Makefile.in @@ -0,0 +1,738 @@ +# Makefile.in generated by automake 1.10.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006, 2007, 2008 Free Software 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+â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +The pam_time PAM module does not authenticate the user, but instead it +restricts access to a system and or specific applications at various times of +the day and on specific days or over various terminal lines. This module can be +configured to deny access to (individual) users based on their name, the time +of day, the day of week, the service they are applying for and their terminal +from which they are making their request. + +By default rules for time/port access are taken from config file /etc/security/ +time.conf. + +If Linux PAM is compiled with audit support the module will report when it +denies access. + +EXAMPLES + +These are some example lines which might be specified in /etc/security/ +time.conf. + +All users except for root are denied access to console-login at all times: + +login ; tty* & !ttyp* ; !root ; !Al0000-2400 + + +Games (configured to use PAM) are only to be accessed out of working hours. +This rule does not apply to the user waster: + + +games ; * ; !waster ; Wd0000-2400 | Wk1800-0800 + + diff --git a/modules/pam_time/README.xml b/modules/pam_time/README.xml new file mode 100644 index 00000000..6c11eec1 --- /dev/null +++ b/modules/pam_time/README.xml @@ -0,0 +1,34 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamtime SYSTEM "pam_time.8.xml"> +--> +<!-- +<!ENTITY timeconf SYSTEM "time.conf.5.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_time.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_time-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_time.8.xml" xpointer='xpointer(//refsect1[@id = "pam_time-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="time.conf.5.xml" xpointer='xpointer(//refsect1[@id = "time.conf-examples"]/*)'/> + </section> + +</article> diff --git a/modules/pam_time/pam_time.8 b/modules/pam_time/pam_time.8 new file mode 100644 index 00000000..4dfb7023 --- /dev/null +++ b/modules/pam_time/pam_time.8 @@ -0,0 +1,95 @@ +.\" Title: pam_time +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_TIME" "8" "04/16/2008" "Linux-PAM Manual" "Linux-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_time - PAM module for time control access +.SH "SYNOPSIS" +.HP 12 +\fBpam_time\.so\fR [debug] [noaudit] +.SH "DESCRIPTION" +.PP +The pam_time PAM module does not authenticate the user, but instead it restricts access to a system and or specific applications at various times of the day and on specific days or over various terminal lines\. This module can be configured to deny access to (individual) users based on their name, the time of day, the day of week, the service they are applying for and their terminal from which they are making their request\. +.PP +By default rules for time/port access are taken from config file +\fI/etc/security/time\.conf\fR\. +.PP +If Linux PAM is compiled with audit support the module will report when it denies access\. +.SH "OPTIONS" +.PP +\fBdebug\fR +.RS 4 +Some debug informations are printed with +\fBsyslog\fR(3)\. +.RE +.PP +\fBnoaudit\fR +.RS 4 +Do not report logins at disallowed time to the audit subsystem\. +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +Only the +\fBaccount\fR +service is supported\. +.SH "RETURN VALUES" +.PP +PAM_SUCCESS +.RS 4 +Access was granted\. +.RE +.PP +PAM_ABORT +.RS 4 +Not all relevant data could be gotten\. +.RE +.PP +PAM_BUF_ERR +.RS 4 +Memory buffer error\. +.RE +.PP +PAM_PERM_DENIED +.RS 4 +Access was not granted\. +.RE +.PP +PAM_USER_UNKNOWN +.RS 4 +The user is not known to the system\. +.RE +.SH "FILES" +.PP +\fI/etc/security/time\.conf\fR +.RS 4 +Default configuration file +.RE +.SH "EXAMPLES" +.sp +.RS 4 +.nf +#%PAM\-1\.0 +# +# apply pam_time accounting to login requests +# +login account required pam_time\.so + +.fi +.RE +.SH "SEE ALSO" +.PP + +\fBtime.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8)\. +.SH "AUTHOR" +.PP +pam_time was written by Andrew G\. Morgan <morgan@kernel\.org>\. diff --git a/modules/pam_time/pam_time.8.xml b/modules/pam_time/pam_time.8.xml new file mode 100644 index 00000000..e0b149a7 --- /dev/null +++ b/modules/pam_time/pam_time.8.xml @@ -0,0 +1,183 @@ +<?xml version="1.0" encoding="ISO-8859-1"?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN" + "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd"> + +<refentry id='pam_time'> + + <refmeta> + <refentrytitle>pam_time</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class='setdesc'>Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id='pam_time-name'> + <refname>pam_time</refname> + <refpurpose> + PAM module for time control access + </refpurpose> + </refnamediv> + +<!-- body begins here --> + + <refsynopsisdiv> + <cmdsynopsis id="pam_time-cmdsynopsis"> + <command>pam_time.so</command> + <arg choice="opt"> + debug + </arg> + <arg choice="opt"> + noaudit + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + + <refsect1 id="pam_time-description"> + <title>DESCRIPTION</title> + <para> + The pam_time PAM module does not authenticate the user, but instead + it restricts access to a system and or specific applications at + various times of the day and on specific days or over various + terminal lines. This module can be configured to deny access to + (individual) users based on their name, the time of day, the day of + week, the service they are applying for and their terminal from which + they are making their request. + </para> + <para> + By default rules for time/port access are taken from config file + <filename>/etc/security/time.conf</filename>. + </para> + <para> + If Linux PAM is compiled with audit support the module will report + when it denies access. + </para> + </refsect1> + + <refsect1 id="pam_time-options"> + <title>OPTIONS</title> + <variablelist> + + <varlistentry> + <term> + <option>debug</option> + </term> + <listitem> + <para> + Some debug informations are printed with + <citerefentry><refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum></citerefentry>. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>noaudit</option> + </term> + <listitem> + <para> + Do not report logins at disallowed time to the audit subsystem. + </para> + </listitem> + </varlistentry> + + </variablelist> + </refsect1> + + <refsect1 id="pam_time-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + Only the <option>account</option> service is supported. + </para> + </refsect1> + + <refsect1 id="pam_time-return_values"> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + Access was granted. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_ABORT</term> + <listitem> + <para> + Not all relevant data could be gotten. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_BUF_ERR</term> + <listitem> + <para> + Memory buffer error. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_PERM_DENIED</term> + <listitem> + <para> + Access was not granted. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_USER_UNKNOWN</term> + <listitem> + <para> + The user is not known to the system. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_time-files"> + <title>FILES</title> + <variablelist> + <varlistentry> + <term><filename>/etc/security/time.conf</filename></term> + <listitem> + <para>Default configuration file</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id='pam_time-examples'> + <title>EXAMPLES</title> + <programlisting> +#%PAM-1.0 +# +# apply pam_time accounting to login requests +# +login account required pam_time.so + </programlisting> + </refsect1> + + <refsect1 id="pam_time-see_also"> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>time.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>. + </para> + </refsect1> + + <refsect1 id="pam_time-authors"> + <title>AUTHOR</title> + <para> + pam_time was written by Andrew G. Morgan <morgan@kernel.org>. + </para> + </refsect1> +</refentry> diff --git a/modules/pam_time/pam_time.c b/modules/pam_time/pam_time.c new file mode 100644 index 00000000..8e3b2486 --- /dev/null +++ b/modules/pam_time/pam_time.c @@ -0,0 +1,687 @@ +/* pam_time module */ + +/* + * Written by Andrew Morgan <morgan@linux.kernel.org> 1996/6/22 + * (File syntax and much other inspiration from the shadow package + * shadow-960129) + */ + +#include "config.h" + +#include <sys/file.h> +#include <stdio.h> +#include <stdlib.h> +#include <ctype.h> +#include <unistd.h> +#include <stdarg.h> +#include <time.h> +#include <syslog.h> +#include <string.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <netdb.h> + +#ifdef HAVE_LIBAUDIT +#include <libaudit.h> +#endif + +#define PAM_TIME_BUFLEN 1000 +#define FIELD_SEPARATOR ';' /* this is new as of .02 */ + +#define PAM_DEBUG_ARG 0x0001 +#define PAM_NO_AUDIT 0x0002 + +#ifndef TRUE +# define TRUE 1 +#endif +#ifndef FALSE +# define FALSE 0 +#endif + +typedef enum { AND, OR } operator; + +/* + * here, we make definitions for the externally accessible functions + * in this file (these definitions are required for static modules + * but strongly encouraged generally) they are used to instruct the + * modules include file to define their prototypes. + */ + +#define PAM_SM_ACCOUNT + +#include <security/_pam_macros.h> +#include <security/pam_modules.h> +#include <security/pam_ext.h> +#include <security/pam_modutil.h> + +static int +_pam_parse (const pam_handle_t *pamh, int argc, const char **argv) +{ + int ctrl = 0; + + /* step through arguments */ + for (; argc-- > 0; ++argv) { + + /* generic options */ + + if (!strcmp(*argv, "debug")) { + ctrl |= PAM_DEBUG_ARG; + } else if (!strcmp(*argv, "noaudit")) { + ctrl |= PAM_NO_AUDIT; + } else { + pam_syslog(pamh, LOG_ERR, "unknown option: %s", *argv); + } + } + + return ctrl; +} + +/* --- static functions for checking whether the user should be let in --- */ + +static void +shift_bytes(char *mem, int from, int by) +{ + while (by-- > 0) { + *mem = mem[from]; + ++mem; + } +} + +static int +read_field(const pam_handle_t *pamh, int fd, char **buf, int *from, int *to) +{ + /* is buf set ? */ + + if (! *buf) { + *buf = (char *) malloc(PAM_TIME_BUFLEN); + if (! *buf) { + pam_syslog(pamh, LOG_ERR, "out of memory"); + D(("no memory")); + return -1; + } + *from = *to = 0; + fd = open(PAM_TIME_CONF, O_RDONLY); + } + + /* do we have a file open ? return error */ + + if (fd < 0 && *to <= 0) { + pam_syslog(pamh, LOG_ERR, "error opening %s: %m", PAM_TIME_CONF); + memset(*buf, 0, PAM_TIME_BUFLEN); + _pam_drop(*buf); + return -1; + } + + /* check if there was a newline last time */ + + if ((*to > *from) && (*to > 0) + && ((*buf)[*from] == '\0')) { /* previous line ended */ + (*from)++; + (*buf)[0] = '\0'; + return fd; + } + + /* ready for more data: first shift the buffer's remaining data */ + + *to -= *from; + shift_bytes(*buf, *from, *to); + *from = 0; + (*buf)[*to] = '\0'; + + while (fd >= 0 && *to < PAM_TIME_BUFLEN) { + int i; + + /* now try to fill the remainder of the buffer */ + + i = read(fd, *to + *buf, PAM_TIME_BUFLEN - *to); + if (i < 0) { + pam_syslog(pamh, LOG_ERR, "error reading %s: %m", PAM_TIME_CONF); + close(fd); + return -1; + } else if (!i) { + close(fd); + fd = -1; /* end of file reached */ + } else + *to += i; + + /* + * contract the buffer. Delete any comments, and replace all + * multiple spaces with single commas + */ + + i = 0; +#ifdef DEBUG_DUMP + D(("buffer=<%s>",*buf)); +#endif + while (i < *to) { + if ((*buf)[i] == ',') { + int j; + + for (j=++i; j<*to && (*buf)[j] == ','; ++j); + if (j!=i) { + shift_bytes(i + (*buf), j-i, (*to) - j); + *to -= j-i; + } + } + switch ((*buf)[i]) { + int j,c; + case '#': + c = 0; + for (j=i; j < *to && (c = (*buf)[j]) != '\n'; ++j); + if (j >= *to) { + (*buf)[*to = ++i] = '\0'; + } else if (c == '\n') { + shift_bytes(i + (*buf), j-i, (*to) - j); + *to -= j-i; + ++i; + } else { + pam_syslog(pamh, LOG_CRIT, + "internal error in file %s at line %d", + __FILE__, __LINE__); + close(fd); + return -1; + } + break; + case '\\': + if ((*buf)[i+1] == '\n') { + shift_bytes(i + *buf, 2, *to - (i+2)); + *to -= 2; + } else { + ++i; /* we don't escape non-newline characters */ + } + break; + case '!': + case ' ': + case '\t': + if ((*buf)[i] != '!') + (*buf)[i] = ','; + /* delete any trailing spaces */ + for (j=++i; j < *to && ( (c = (*buf)[j]) == ' ' + || c == '\t' ); ++j); + shift_bytes(i + *buf, j-i, (*to)-j ); + *to -= j-i; + break; + default: + ++i; + } + } + } + + (*buf)[*to] = '\0'; + + /* now return the next field (set the from/to markers) */ + { + int i; + + for (i=0; i<*to; ++i) { + switch ((*buf)[i]) { + case '#': + case '\n': /* end of the line/file */ + (*buf)[i] = '\0'; + *from = i; + return fd; + case FIELD_SEPARATOR: /* end of the field */ + (*buf)[i] = '\0'; + *from = ++i; + return fd; + } + } + *from = i; + (*buf)[*from] = '\0'; + } + + if (*to <= 0) { + D(("[end of text]")); + *buf = NULL; + } + + return fd; +} + +/* read a member from a field */ + +static int +logic_member(const char *string, int *at) +{ + int c,to; + int done=0; + int token=0; + + to=*at; + do { + c = string[to++]; + + switch (c) { + + case '\0': + --to; + done = 1; + break; + + case '&': + case '|': + case '!': + if (token) { + --to; + } + done = 1; + break; + + default: + if (isalpha(c) || c == '*' || isdigit(c) || c == '_' + || c == '-' || c == '.' || c == '/' || c == ':') { + token = 1; + } else if (token) { + --to; + done = 1; + } else { + ++*at; + } + } + } while (!done); + + return to - *at; +} + +typedef enum { VAL, OP } expect; + +static int +logic_field(pam_handle_t *pamh, const void *me, const char *x, int rule, + int (*agrees)(pam_handle_t *pamh, + const void *, const char *, int, int)) +{ + int left=FALSE, right, not=FALSE; + operator oper=OR; + int at=0, l; + expect next=VAL; + + while ((l = logic_member(x,&at))) { + int c = x[at]; + + if (next == VAL) { + if (c == '!') + not = !not; + else if (isalpha(c) || c == '*' || isdigit(c) || c == '_' + || c == '-' || c == '.' || c == '/' || c == ':') { + right = not ^ agrees(pamh, me, x+at, l, rule); + if (oper == AND) + left &= right; + else + left |= right; + next = OP; + } else { + pam_syslog(pamh, LOG_ERR, + "garbled syntax; expected name (rule #%d)", + rule); + return FALSE; + } + } else { /* OP */ + switch (c) { + case '&': + oper = AND; + break; + case '|': + oper = OR; + break; + default: + pam_syslog(pamh, LOG_ERR, + "garbled syntax; expected & or | (rule #%d)", + rule); + D(("%c at %d",c,at)); + return FALSE; + } + next = VAL; + } + at += l; + } + + return left; +} + +static int +is_same(pam_handle_t *pamh UNUSED, const void *A, const char *b, + int len, int rule UNUSED) +{ + int i; + const char *a; + + a = A; + for (i=0; len > 0; ++i, --len) { + if (b[i] != a[i]) { + if (b[i++] == '*') { + return (!--len || !strncmp(b+i,a+strlen(a)-len,len)); + } else + return FALSE; + } + } + + /* Ok, we know that b is a substring from A and does not contain + wildcards, but now the length of both strings must be the same, + too. */ + if (strlen (a) != strlen(b)) + return FALSE; + + return ( !len ); +} + +typedef struct { + int day; /* array of 7 bits, one set for today */ + int minute; /* integer, hour*100+minute for now */ +} TIME; + +static struct day { + const char *d; + int bit; +} const days[11] = { + { "su", 01 }, + { "mo", 02 }, + { "tu", 04 }, + { "we", 010 }, + { "th", 020 }, + { "fr", 040 }, + { "sa", 0100 }, + { "wk", 076 }, + { "wd", 0101 }, + { "al", 0177 }, + { NULL, 0 } +}; + +static TIME +time_now(void) +{ + struct tm *local; + time_t the_time; + TIME this; + + the_time = time((time_t *)0); /* get the current time */ + local = localtime(&the_time); + this.day = days[local->tm_wday].bit; + this.minute = local->tm_hour*100 + local->tm_min; + + D(("day: 0%o, time: %.4d", this.day, this.minute)); + return this; +} + +/* take the current date and see if the range "date" passes it */ +static int +check_time(pam_handle_t *pamh, const void *AT, const char *times, + int len, int rule) +{ + int not,pass; + int marked_day, time_start, time_end; + const TIME *at; + int i,j=0; + + at = AT; + D(("chcking: 0%o/%.4d vs. %s", at->day, at->minute, times)); + + if (times == NULL) { + /* this should not happen */ + pam_syslog(pamh, LOG_CRIT, + "internal error in file %s at line %d", + __FILE__, __LINE__); + return FALSE; + } + + if (times[j] == '!') { + ++j; + not = TRUE; + } else { + not = FALSE; + } + + for (marked_day = 0; len > 0 && isalpha(times[j]); --len) { + int this_day=-1; + + D(("%c%c ?", times[j], times[j+1])); + for (i=0; days[i].d != NULL; ++i) { + if (tolower(times[j]) == days[i].d[0] + && tolower(times[j+1]) == days[i].d[1] ) { + this_day = days[i].bit; + break; + } + } + j += 2; + if (this_day == -1) { + pam_syslog(pamh, LOG_ERR, "bad day specified (rule #%d)", rule); + return FALSE; + } + marked_day ^= this_day; + } + if (marked_day == 0) { + pam_syslog(pamh, LOG_ERR, "no day specified"); + return FALSE; + } + D(("day range = 0%o", marked_day)); + + time_start = 0; + for (i=0; len > 0 && i < 4 && isdigit(times[i+j]); ++i, --len) { + time_start *= 10; + time_start += times[i+j]-'0'; /* is this portable? */ + } + j += i; + + if (times[j] == '-') { + time_end = 0; + for (i=1; len > 0 && i < 5 && isdigit(times[i+j]); ++i, --len) { + time_end *= 10; + time_end += times[i+j]-'0'; /* is this portable */ + } + j += i; + } else + time_end = -1; + + D(("i=%d, time_end=%d, times[j]='%c'", i, time_end, times[j])); + if (i != 5 || time_end == -1) { + pam_syslog(pamh, LOG_ERR, "no/bad times specified (rule #%d)", rule); + return TRUE; + } + D(("times(%d to %d)", time_start,time_end)); + D(("marked_day = 0%o", marked_day)); + + /* compare with the actual time now */ + + pass = FALSE; + if (time_start < time_end) { /* start < end ? --> same day */ + if ((at->day & marked_day) && (at->minute >= time_start) + && (at->minute < time_end)) { + D(("time is listed")); + pass = TRUE; + } + } else { /* spans two days */ + if ((at->day & marked_day) && (at->minute >= time_start)) { + D(("caught on first day")); + pass = TRUE; + } else { + marked_day <<= 1; + marked_day |= (marked_day & 0200) ? 1:0; + D(("next day = 0%o", marked_day)); + if ((at->day & marked_day) && (at->minute <= time_end)) { + D(("caught on second day")); + pass = TRUE; + } + } + } + + return (not ^ pass); +} + +static int +check_account(pam_handle_t *pamh, const char *service, + const char *tty, const char *user) +{ + int from=0,to=0,fd=-1; + char *buffer=NULL; + int count=0; + TIME here_and_now; + int retval=PAM_SUCCESS; + + here_and_now = time_now(); /* find current time */ + do { + int good=TRUE,intime; + + /* here we get the service name field */ + + fd = read_field(pamh, fd, &buffer, &from, &to); + + if (!buffer || !buffer[0]) { + /* empty line .. ? */ + continue; + } + ++count; + + good = logic_field(pamh, service, buffer, count, is_same); + D(("with service: %s", good ? "passes":"fails" )); + + /* here we get the terminal name field */ + + fd = read_field(pamh, fd, &buffer, &from, &to); + if (!buffer || !buffer[0]) { + pam_syslog(pamh, LOG_ERR, + "%s: no tty entry #%d", PAM_TIME_CONF, count); + continue; + } + good &= logic_field(pamh, tty, buffer, count, is_same); + D(("with tty: %s", good ? "passes":"fails" )); + + /* here we get the username field */ + + fd = read_field(pamh, fd, &buffer, &from, &to); + if (!buffer || !buffer[0]) { + pam_syslog(pamh, LOG_ERR, + "%s: no user entry #%d", PAM_TIME_CONF, count); + continue; + } + /* If buffer starts with @, we are using netgroups */ + if (buffer[0] == '@') + good &= innetgr (&buffer[1], NULL, user, NULL); + else + good &= logic_field(pamh, user, buffer, count, is_same); + D(("with user: %s", good ? "passes":"fails" )); + + /* here we get the time field */ + + fd = read_field(pamh, fd, &buffer, &from, &to); + if (!buffer || !buffer[0]) { + pam_syslog(pamh, LOG_ERR, + "%s: no time entry #%d", PAM_TIME_CONF, count); + continue; + } + + intime = logic_field(pamh, &here_and_now, buffer, count, check_time); + D(("with time: %s", intime ? "passes":"fails" )); + + fd = read_field(pamh, fd, &buffer, &from, &to); + if (buffer && buffer[0]) { + pam_syslog(pamh, LOG_ERR, + "%s: poorly terminated rule #%d", PAM_TIME_CONF, count); + continue; + } + + if (good && !intime) { + /* + * for security parse whole file.. also need to ensure + * that the buffer is free()'d and the file is closed. + */ + retval = PAM_PERM_DENIED; + } else { + D(("rule passed")); + } + } while (buffer); + + return retval; +} + +/* --- public account management functions --- */ + +PAM_EXTERN int +pam_sm_acct_mgmt(pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + const void *service=NULL, *void_tty=NULL; + const char *tty; + const char *user=NULL; + int ctrl; + int rv; + + ctrl = _pam_parse(pamh, argc, argv); + + /* set service name */ + + if (pam_get_item(pamh, PAM_SERVICE, &service) + != PAM_SUCCESS || service == NULL) { + pam_syslog(pamh, LOG_ERR, "cannot find the current service name"); + return PAM_ABORT; + } + + /* set username */ + + if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS || user == NULL + || *user == '\0') { + pam_syslog(pamh, LOG_ERR, "can not get the username"); + return PAM_USER_UNKNOWN; + } + + /* set tty name */ + + if (pam_get_item(pamh, PAM_TTY, &void_tty) != PAM_SUCCESS + || void_tty == NULL) { + D(("PAM_TTY not set, probing stdin")); + tty = ttyname(STDIN_FILENO); + if (tty == NULL) { + tty = ""; + } + if (pam_set_item(pamh, PAM_TTY, tty) != PAM_SUCCESS) { + pam_syslog(pamh, LOG_ERR, "couldn't set tty name"); + return PAM_ABORT; + } + } + else + tty = void_tty; + + if (tty[0] == '/') { /* full path */ + const char *t; + tty++; + if ((t = strchr(tty, '/')) != NULL) { + tty = t + 1; + } + } + + /* good, now we have the service name, the user and the terminal name */ + + D(("service=%s", service)); + D(("user=%s", user)); + D(("tty=%s", tty)); + + rv = check_account(pamh, service, tty, user); + if (rv != PAM_SUCCESS) { +#ifdef HAVE_LIBAUDIT + if (!(ctrl & PAM_NO_AUDIT)) { + pam_modutil_audit_write(pamh, AUDIT_ANOM_LOGIN_TIME, + "pam_time", rv); /* ignore return value as we fail anyway */ + } +#endif + if (ctrl & PAM_DEBUG_ARG) { + pam_syslog(pamh, LOG_DEBUG, "user %s rejected", user); + } + } + return rv; +} + +/* end of module definition */ + +#ifdef PAM_STATIC + +/* static module data */ + +struct pam_module _pam_time_modstruct = { + "pam_time", + NULL, + NULL, + pam_sm_acct_mgmt, + NULL, + NULL, + NULL +}; +#endif diff --git a/modules/pam_time/time.conf b/modules/pam_time/time.conf new file mode 100644 index 00000000..c7b7989c --- /dev/null +++ b/modules/pam_time/time.conf @@ -0,0 +1,65 @@ +# this is an example configuration file for the pam_time module. Its syntax +# was initially based heavily on that of the shadow package (shadow-960129). +# +# the syntax of the lines is as follows: +# +# services;ttys;users;times +# +# white space is ignored and lines maybe extended with '\\n' (escaped +# newlines). As should be clear from reading these comments, +# text following a '#' is ignored to the end of the line. +# +# the combination of individual users/terminals etc is a logic list +# namely individual tokens that are optionally prefixed with '!' (logical +# not) and separated with '&' (logical and) and '|' (logical or). +# +# services +# is a logic list of PAM service names that the rule applies to. +# +# ttys +# is a logic list of terminal names that this rule applies to. +# +# users +# is a logic list of users or a netgroup of users to whom this +# rule applies. +# +# NB. For these items the simple wildcard '*' may be used only once. +# +# times +# the format here is a logic list of day/time-range +# entries the days are specified by a sequence of two character +# entries, MoTuSa for example is Monday Tuesday and Saturday. Note +# that repeated days are unset MoMo = no day, and MoWk = all weekdays +# bar Monday. The two character combinations accepted are +# +# Mo Tu We Th Fr Sa Su Wk Wd Al +# +# the last two being week-end days and all 7 days of the week +# respectively. As a final example, AlFr means all days except Friday. +# +# each day/time-range can be prefixed with a '!' to indicate "anything +# but" +# +# The time-range part is two 24-hour times HHMM separated by a hyphen +# indicating the start and finish time (if the finish time is smaller +# than the start time it is deemed to apply on the following day). +# +# for a rule to be active, ALL of service+ttys+users must be satisfied +# by the applying process. +# + +# +# Here is a simple example: running blank on tty* (any ttyXXX device), +# the users 'you' and 'me' are denied service all of the time +# + +#blank;tty* & !ttyp*;you|me;!Al0000-2400 + +# Another silly example, user 'root' is denied xsh access +# from pseudo terminals at the weekend and on mondays. + +#xsh;ttyp*;root;!WdMo0000-2400 + +# +# End of example file. +# diff --git a/modules/pam_time/time.conf.5 b/modules/pam_time/time.conf.5 new file mode 100644 index 00000000..479a3e1d --- /dev/null +++ b/modules/pam_time/time.conf.5 @@ -0,0 +1,91 @@ +.\" Title: time.conf +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "TIME\.CONF" "5" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +time.conf - configuration file for the pam_time module +.SH "DESCRIPTION" +.PP +The pam_time PAM module does not authenticate the user, but instead it restricts access to a system and or specific applications at various times of the day and on specific days or over various terminal lines\. This module can be configured to deny access to (individual) users based on their name, the time of day, the day of week, the service they are applying for and their terminal from which they are making their request\. +.PP +For this module to function correctly there must be a correctly formatted +\fI/etc/security/time\.conf\fR +file present\. White spaces are ignored and lines maybe extended with \'\e\' (escaped newlines)\. Text following a \'#\' is ignored to the end of the line\. +.PP +The syntax of the lines is as follows: +.PP + +\fIservices\fR;\fIttys\fR;\fIusers\fR;\fItimes\fR +.PP +In words, each rule occupies a line, terminated with a newline or the beginning of a comment; a \'\fB#\fR\'\. It contains four fields separated with semicolons, \'\fB;\fR\'\. +.PP +The first field, the +\fIservices\fR +field, is a logic list of PAM service names that the rule applies to\. +.PP +The second field, the +\fItty\fR +field, is a logic list of terminal names that this rule applies to\. +.PP +The third field, the +\fIusers\fR +field, is a logic list of users or a netgroup of users to whom this rule applies\. +.PP +For these items the simple wildcard \'*\' may be used only once\. With netgroups no wildcards or logic operators are allowed\. +.PP +The +\fItimes\fR +field is used to indicate the times at which this rule applies\. The format here is a logic list of day/time\-range entries\. The days are specified by a sequence of two character entries, MoTuSa for example is Monday Tuesday and Saturday\. Note that repeated days are unset MoMo = no day, and MoWk = all weekdays bar Monday\. The two character combinations accepted are Mo Tu We Th Fr Sa Su Wk Wd Al, the last two being week\-end days and all 7 days of the week respectively\. As a final example, AlFr means all days except Friday\. +.PP +Each day/time\-range can be prefixed with a \'!\' to indicate "anything but"\. The time\-range part is two 24\-hour times HHMM, separated by a hyphen, indicating the start and finish time (if the finish time is smaller than the start time it is deemed to apply on the following day)\. +.PP +For a rule to be active, ALL of service+ttys+users must be satisfied by the applying process\. +.PP +Note, currently there is no daemon enforcing the end of a session\. This needs to be remedied\. +.PP +Poorly formatted rules are logged as errors using +\fBsyslog\fR(3)\. +.SH "EXAMPLES" +.PP +These are some example lines which might be specified in +\fI/etc/security/time\.conf\fR\. +.PP +All users except for +\fIroot\fR +are denied access to console\-login at all times: +.sp +.RS 4 +.nf +login ; tty* & !ttyp* ; !root ; !Al0000\-2400 + +.fi +.RE +.PP +Games (configured to use PAM) are only to be accessed out of working hours\. This rule does not apply to the user +\fIwaster\fR: +.sp +.RS 4 +.nf + +games ; * ; !waster ; Wd0000\-2400 | Wk1800\-0800 + +.fi +.RE +.sp +.SH "SEE ALSO" +.PP + +\fBpam_time\fR(8), +\fBpam.d\fR(5), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_time was written by Andrew G\. Morgan <morgan@kernel\.org>\. diff --git a/modules/pam_time/time.conf.5.xml b/modules/pam_time/time.conf.5.xml new file mode 100644 index 00000000..224fda34 --- /dev/null +++ b/modules/pam_time/time.conf.5.xml @@ -0,0 +1,143 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="time.conf"> + + <refmeta> + <refentrytitle>time.conf</refentrytitle> + <manvolnum>5</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv> + <refname>time.conf</refname> + <refpurpose>configuration file for the pam_time module</refpurpose> + </refnamediv> + + <refsect1 id='time.conf-description'> + <title>DESCRIPTION</title> + + <para> + The pam_time PAM module does not authenticate the user, but instead + it restricts access to a system and or specific applications at + various times of the day and on specific days or over various + terminal lines. This module can be configured to deny access to + (individual) users based on their name, the time of day, the day of + week, the service they are applying for and their terminal from which + they are making their request. + </para> + <para> + For this module to function correctly there must be a correctly + formatted <filename>/etc/security/time.conf</filename> file present. + White spaces are ignored and lines maybe extended with '\' (escaped + newlines). Text following a '#' is ignored to the end of the line. + </para> + + <para> + The syntax of the lines is as follows: + </para> + + <para> + <replaceable>services</replaceable>;<replaceable>ttys</replaceable>;<replaceable>users</replaceable>;<replaceable>times</replaceable> + </para> + <para> + In words, each rule occupies a line, terminated with a newline + or the beginning of a comment; a '<emphasis remap='B'>#</emphasis>'. + It contains four fields separated with semicolons, + '<emphasis remap='B'>;</emphasis>'. + </para> + + <para> + The first field, the <replaceable>services</replaceable> field, + is a logic list of PAM service names that the rule applies to. + </para> + + <para> + The second field, the <replaceable>tty</replaceable> + field, is a logic list of terminal names that this rule applies to. + </para> + + <para> + The third field, the <replaceable>users</replaceable> + field, is a logic list of users or a netgroup of users to whom this + rule applies. + </para> + + <para> + For these items the simple wildcard '*' may be used only once. + With netgroups no wildcards or logic operators are allowed. + </para> + + <para> + The <replaceable>times</replaceable> field is used to indicate the times + at which this rule applies. The format here is a logic + list of day/time-range entries. The days are specified by a sequence of + two character entries, MoTuSa for example is Monday Tuesday and Saturday. + Note that repeated days are unset MoMo = no day, and MoWk = all weekdays + bar Monday. The two character combinations accepted are Mo Tu We Th Fr Sa + Su Wk Wd Al, the last two being week-end days and all 7 days of the week + respectively. As a final example, AlFr means all days except Friday. + </para> + <para> + Each day/time-range can be prefixed with a '!' to indicate + "anything but". + The time-range part is two 24-hour times HHMM, separated by a hyphen, + indicating the start and finish time (if the finish time is smaller + than the start time it is deemed to apply on the following day). + </para> + + <para> + For a rule to be active, ALL of service+ttys+users must be satisfied + by the applying process. + </para> + <para> + Note, currently there is no daemon enforcing the end of a session. + This needs to be remedied. + </para> + <para> + Poorly formatted rules are logged as errors using + <citerefentry><refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum></citerefentry>. + </para> + </refsect1> + + <refsect1 id="time.conf-examples"> + <title>EXAMPLES</title> + <para> + These are some example lines which might be specified in + <filename>/etc/security/time.conf</filename>. + </para> + <para> + All users except for <emphasis>root</emphasis> are denied access + to console-login at all times: + <programlisting> +login ; tty* & !ttyp* ; !root ; !Al0000-2400 + </programlisting> + </para> + + <para> + Games (configured to use PAM) are only to be accessed out of + working hours. This rule does not apply to the user + <emphasis>waster</emphasis>: + <programlisting> +games ; * ; !waster ; Wd0000-2400 | Wk1800-0800 + </programlisting> + </para> + </refsect1> + + <refsect1 id="time.conf-see_also"> + <title>SEE ALSO</title> + <para> + <citerefentry><refentrytitle>pam_time</refentrytitle><manvolnum>8</manvolnum></citerefentry>, + <citerefentry><refentrytitle>pam.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum></citerefentry> + </para> + </refsect1> + + <refsect1 id="time.conf-author"> + <title>AUTHOR</title> + <para> + pam_time was written by Andrew G. Morgan <morgan@kernel.org>. + </para> + </refsect1> +</refentry> diff --git a/modules/pam_time/tst-pam_time b/modules/pam_time/tst-pam_time new file mode 100755 index 00000000..030717bb --- /dev/null +++ b/modules/pam_time/tst-pam_time @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_time.so diff --git a/modules/pam_tty_audit/Makefile.am b/modules/pam_tty_audit/Makefile.am new file mode 100644 index 00000000..5bb64585 --- /dev/null +++ b/modules/pam_tty_audit/Makefile.am @@ -0,0 +1,30 @@ +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README $(MANS) $(XMLS) + +man_MANS = pam_tty_audit.8 +XMLS = README.xml pam_tty_audit.8.xml + +securelibdir = $(SECUREDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +if HAVE_AUDIT_TTY_STATUS + pam_tty_audit_la_LIBADD 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--- /dev/null +++ b/modules/pam_tty_audit/README @@ -0,0 +1,48 @@ +pam_tty_audit — Enable or disable TTY auditing for specified users + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +The pam_tty_audit PAM module is used to enable or disable TTY auditing. By +default, the kernel does not audit input on any TTY. + +OPTIONS + +disable=patterns + + For each user matching one of comma-separated glob patterns, disable TTY + auditing. This overrides any previous enable option matchin the same user + name on the command line. + +enable=patterns + + For each user matching one of comma-separated glob patterns, enable TTY + auditing. This overrides any previous disable option matching the same user + name on the command line. + +open_only + + Set the TTY audit flag when opening the session, but do not restore it when + closing the session. Using this option is necessary for some services that + don't fork() to run the authenticated session, such as sudo. + +NOTES + +When TTY auditing is enabled, it is inherited by all processes started by that +user. In particular, daemons restarted by an user will still have TTY auditing +enabled, and audit TTY input even by other users unless auditing for these +users is explicitly disabled. Therefore, it is recommended to use disable=* as +the first option for most daemons using PAM. + +EXAMPLES + +Audit all administrative actions. + +session required pam_tty_audit.so disable=* enable=root + + +AUTHOR + +pam_tty_audit was written by Miloslav TrmaÄ <mitr@redhat.com>. + diff --git a/modules/pam_tty_audit/README.xml b/modules/pam_tty_audit/README.xml new file mode 100644 index 00000000..4dad6bbe --- /dev/null +++ b/modules/pam_tty_audit/README.xml @@ -0,0 +1,41 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd"> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_tty_audit.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_tty_audit-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_tty_audit.8.xml" xpointer='xpointer(//refsect1[@id = "pam_tty_audit-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_tty_audit.8.xml" xpointer='xpointer(//refsect1[@id = "pam_tty_audit-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_tty_audit.8.xml" xpointer='xpointer(//refsect1[@id = "pam_tty_audit-notes"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_tty_audit.8.xml" xpointer='xpointer(//refsect1[@id = "pam_tty_audit-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_tty_audit.8.xml" xpointer='xpointer(//refsect1[@id = "pam_tty_audit-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_tty_audit/pam_tty_audit.8 b/modules/pam_tty_audit/pam_tty_audit.8 new file mode 100644 index 00000000..fdf0121b --- /dev/null +++ b/modules/pam_tty_audit/pam_tty_audit.8 @@ -0,0 +1,80 @@ +.\" Title: pam_tty_audit +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_TTY_AUDIT" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_tty_audit - Enable or disable TTY auditing for specified users +.SH "SYNOPSIS" +.HP 17 +\fBpam_tty_audit\.so\fR [disable=\fIpatterns\fR] [enable=\fIpatterns\fR] +.SH "DESCRIPTION" +.PP +The pam_tty_audit PAM module is used to enable or disable TTY auditing\. By default, the kernel does not audit input on any TTY\. +.SH "OPTIONS" +.PP +\fBdisable=\fR\fB\fIpatterns\fR\fR +.RS 4 +For each user matching one of comma\-separated glob +\fB\fIpatterns\fR\fR, disable TTY auditing\. This overrides any previous +\fBenable\fR +option matchin the same user name on the command line\. +.RE +.PP +\fBenable=\fR\fB\fIpatterns\fR\fR +.RS 4 +For each user matching one of comma\-separated glob +\fB\fIpatterns\fR\fR, enable TTY auditing\. This overrides any previous +\fBdisable\fR +option matching the same user name on the command line\. +.RE +.PP +\fBopen_only\fR +.RS 4 +Set the TTY audit flag when opening the session, but do not restore it when closing the session\. Using this option is necessary for some services that don\'t +\fBfork()\fR +to run the authenticated session, such as +\fBsudo\fR\. +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +Only the +\fBsession\fR +service is supported\. +.SH "RETURN VALUES" +.PP +PAM_SESSION_ERR +.RS 4 +Error reading or modifying the TTY audit flag\. See the system log for more details\. +.RE +.PP +PAM_SUCCESS +.RS 4 +Success\. +.RE +.SH "NOTES" +.PP +When TTY auditing is enabled, it is inherited by all processes started by that user\. In particular, daemons restarted by an user will still have TTY auditing enabled, and audit TTY input even by other users unless auditing for these users is explicitly disabled\. Therefore, it is recommended to use +\fBdisable=*\fR +as the first option for most daemons using PAM\. +.SH "EXAMPLES" +.PP +Audit all administrative actions\. +.sp +.RS 4 +.nf +session required pam_tty_audit\.so disable=* enable=root + +.fi +.RE +.sp +.SH "AUTHOR" +.PP +pam_tty_audit was written by Miloslav TrmaÄ <mitr@redhat\.com>\. diff --git a/modules/pam_tty_audit/pam_tty_audit.8.xml b/modules/pam_tty_audit/pam_tty_audit.8.xml new file mode 100644 index 00000000..f6f0602f --- /dev/null +++ b/modules/pam_tty_audit/pam_tty_audit.8.xml @@ -0,0 +1,145 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_tty_audit"> + + <refmeta> + <refentrytitle>pam_tty_audit</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_tty_audit-name"> + <refname>pam_tty_audit</refname> + <refpurpose>Enable or disable TTY auditing for specified users</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_tty_audit-cmdsynopsis"> + <command>pam_tty_audit.so</command> + <arg choice="opt"> + disable=<replaceable>patterns</replaceable> + </arg> + <arg choice="opt"> + enable=<replaceable>patterns</replaceable> + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_tty_audit-description"> + <title>DESCRIPTION</title> + <para> + The pam_tty_audit PAM module is used to enable or disable TTY auditing. + By default, the kernel does not audit input on any TTY. + </para> + </refsect1> + + <refsect1 id="pam_tty_audit-options"> + <title>OPTIONS</title> + <variablelist> + <varlistentry> + <term> + <option>disable=<replaceable>patterns</replaceable></option> + </term> + <listitem> + <para> + For each user matching one of comma-separated glob + <option><replaceable>patterns</replaceable></option>, disable + TTY auditing. This overrides any previous <option>enable</option> + option matchin the same user name on the command line. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>enable=<replaceable>patterns</replaceable></option> + </term> + <listitem> + <para> + For each user matching one of comma-separated glob + <option><replaceable>patterns</replaceable></option>, enable + TTY auditing. This overrides any previous <option>disable</option> + option matching the same user name on the command line. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>open_only</option> + </term> + <listitem> + <para> + Set the TTY audit flag when opening the session, but do not restore + it when closing the session. Using this option is necessary for + some services that don't <function>fork()</function> to run the + authenticated session, such as <command>sudo</command>. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_tty_audit-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + Only the <emphasis remap='B'>session</emphasis> service is supported. + </para> + </refsect1> + + <refsect1 id='pam_tty_audit-return_values'> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_SESSION_ERR</term> + <listitem> + <para> + Error reading or modifying the TTY audit flag. See the system log + for more details. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + Success. + </para> + </listitem> + </varlistentry> + + </variablelist> + </refsect1> + + <refsect1 id='pam_tty_audit-notes'> + <title>NOTES</title> + <para> + When TTY auditing is enabled, it is inherited by all processes started by + that user. In particular, daemons restarted by an user will still have + TTY auditing enabled, and audit TTY input even by other users unless + auditing for these users is explicitly disabled. Therefore, it is + recommended to use <option>disable=*</option> as the first option for + most daemons using PAM. + </para> + </refsect1> + + <refsect1 id='pam_tty_audit-examples'> + <title>EXAMPLES</title> + <para> + Audit all administrative actions. + <programlisting> +session required pam_tty_audit.so disable=* enable=root + </programlisting> + </para> + </refsect1> + + <refsect1 id='pam_tty_audit-author'> + <title>AUTHOR</title> + <para> + pam_tty_audit was written by Miloslav Trmač + <mitr@redhat.com>. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_tty_audit/pam_tty_audit.c b/modules/pam_tty_audit/pam_tty_audit.c new file mode 100644 index 00000000..d57dbbe3 --- /dev/null +++ b/modules/pam_tty_audit/pam_tty_audit.c @@ -0,0 +1,346 @@ +/* Copyright © 2007, 2008 Red Hat, Inc. All rights reserved. + Red Hat author: Miloslav TrmaÄ <mitr@redhat.com> + + Redistribution and use in source and binary forms of Linux-PAM, with + or without modification, are permitted provided that the following + conditions are met: + + 1. Redistributions of source code must retain any existing copyright + notice, and this entire permission notice in its entirety, + including the disclaimer of warranties. + + 2. Redistributions in binary form must reproduce all prior and current + copyright notices, this list of conditions, and the following + disclaimer in the documentation and/or other materials provided + with the distribution. + + 3. The name of any author may not be used to endorse or promote + products derived from this software without their specific prior + written permission. + + ALTERNATIVELY, this product may be distributed under the terms of the + GNU General Public License, in which case the provisions of the GNU + GPL are required INSTEAD OF the above restrictions. (This clause is + necessary due to a potential conflict between the GNU GPL and the + restrictions contained in a BSD-style copyright.) + + THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, + INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR + TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE + USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH + DAMAGE. */ + +#include <errno.h> +#include <fnmatch.h> +#include <stdlib.h> +#include <string.h> +#include <syslog.h> +#include <sys/socket.h> +#include <unistd.h> + +#include <libaudit.h> +#include <linux/netlink.h> + +#define PAM_SM_SESSION + +#include <security/pam_ext.h> +#include <security/pam_modules.h> +#include <security/pam_modutil.h> + +#define DATANAME "pam_tty_audit_last_state" + +/* Open an audit netlink socket */ +static int +nl_open (void) +{ + return socket (AF_NETLINK, SOCK_RAW, NETLINK_AUDIT); +} + +static int +nl_send (int fd, unsigned type, unsigned flags, const void *data, size_t size) +{ + struct sockaddr_nl addr; + struct msghdr msg; + struct nlmsghdr nlm; + struct iovec iov[2]; + ssize_t res; + + nlm.nlmsg_len = NLMSG_LENGTH (size); + nlm.nlmsg_type = type; + nlm.nlmsg_flags = NLM_F_REQUEST | flags; + nlm.nlmsg_seq = 0; + nlm.nlmsg_pid = 0; + iov[0].iov_base = &nlm; + iov[0].iov_len = sizeof (nlm); + iov[1].iov_base = (void *)data; + iov[1].iov_len = size; + addr.nl_family = AF_NETLINK; + addr.nl_pid = 0; + addr.nl_groups = 0; + msg.msg_name = &addr; + msg.msg_namelen = sizeof (addr); + msg.msg_iov = iov; + msg.msg_iovlen = 2; + msg.msg_control = NULL; + msg.msg_controllen = 0; + msg.msg_flags = 0; + res = sendmsg (fd, &msg, 0); + if (res == -1) + return -1; + if ((size_t)res != nlm.nlmsg_len) + { + errno = EIO; + return -1; + } + return 0; +} + +static int +nl_recv (int fd, unsigned type, void *buf, size_t size) +{ + struct sockaddr_nl addr; + struct msghdr msg; + struct nlmsghdr nlm; + struct iovec iov[2]; + ssize_t res; + + again: + iov[0].iov_base = &nlm; + iov[0].iov_len = sizeof (nlm); + msg.msg_name = &addr; + msg.msg_namelen = sizeof (addr); + msg.msg_iov = iov; + msg.msg_iovlen = 1; + msg.msg_control = NULL; + msg.msg_controllen = 0; + if (type != NLMSG_ERROR) + { + res = recvmsg (fd, &msg, MSG_PEEK); + if (res == -1) + return -1; + if (res != NLMSG_LENGTH (0)) + { + errno = EIO; + return -1; + } + if (nlm.nlmsg_type == NLMSG_ERROR) + { + struct nlmsgerr err; + + iov[1].iov_base = &err; + iov[1].iov_len = sizeof (err); + msg.msg_iovlen = 2; + res = recvmsg (fd, &msg, 0); + if (res == -1) + return -1; + if ((size_t)res != NLMSG_LENGTH (sizeof (err)) + || nlm.nlmsg_type != NLMSG_ERROR) + { + errno = EIO; + return -1; + } + if (err.error == 0) + goto again; + errno = -err.error; + return -1; + } + } + if (size != 0) + { + iov[1].iov_base = buf; + iov[1].iov_len = size; + msg.msg_iovlen = 2; + } + res = recvmsg (fd, &msg, 0); + if (res == -1) + return -1; + if ((size_t)res != NLMSG_LENGTH (size) + || nlm.nlmsg_type != type) + { + errno = EIO; + return -1; + } + return 0; +} + +static int +nl_recv_ack (int fd) +{ + struct nlmsgerr err; + + if (nl_recv (fd, NLMSG_ERROR, &err, sizeof (err)) != 0) + return -1; + if (err.error != 0) + { + errno = -err.error; + return -1; + } + return 0; +} + +static void +cleanup_old_status (pam_handle_t *pamh, void *data, int error_status) +{ + (void)pamh; + (void)error_status; + free (data); +} + +int +pam_sm_open_session (pam_handle_t *pamh, int flags, int argc, const char **argv) +{ + enum command { CMD_NONE, CMD_ENABLE, CMD_DISABLE }; + + enum command command; + struct audit_tty_status *old_status, new_status; + const char *user; + int i, fd, open_only; + + (void)flags; + + if (pam_get_user (pamh, &user, NULL) != PAM_SUCCESS) + { + pam_syslog (pamh, LOG_ERR, "error determining target user's name"); + return PAM_SESSION_ERR; + } + + command = CMD_NONE; + open_only = 0; + for (i = 0; i < argc; i++) + { + if (strncmp (argv[i], "enable=", 7) == 0 + || strncmp (argv[i], "disable=", 8) == 0) + { + enum command this_command; + char *copy, *tok_data, *tok; + + this_command = *argv[i] == 'e' ? CMD_ENABLE : CMD_DISABLE; + copy = strdup (strchr (argv[i], '=') + 1); + if (copy == NULL) + return PAM_SESSION_ERR; + for (tok = strtok_r (copy, ",", &tok_data); tok != NULL; + tok = strtok_r (NULL, ",", &tok_data)) + { + if (fnmatch (tok, user, 0) == 0) + { + command = this_command; + break; + } + } + free (copy); + } + else if (strcmp (argv[i], "open_only") == 0) + open_only = 1; + else + { + pam_syslog (pamh, LOG_ERR, "unknown option `%s'", argv[i]); + return PAM_SESSION_ERR; + } + } + if (command == CMD_NONE) + return PAM_SUCCESS; + + old_status = malloc (sizeof (*old_status)); + if (old_status == NULL) + return PAM_SESSION_ERR; + + fd = nl_open (); + if (fd == -1 + || nl_send (fd, AUDIT_TTY_GET, 0, NULL, 0) != 0 + || nl_recv (fd, AUDIT_TTY_GET, old_status, sizeof (*old_status)) != 0) + { + pam_syslog (pamh, LOG_ERR, "error reading current audit status: %m"); + if (fd != -1) + close (fd); + free (old_status); + return PAM_SESSION_ERR; + } + + new_status.enabled = (command == CMD_ENABLE ? 1 : 0); + if (old_status->enabled == new_status.enabled) + { + free (old_status); + goto ok_fd; + } + + if (open_only == 0 + && pam_set_data (pamh, DATANAME, old_status, cleanup_old_status) + != PAM_SUCCESS) + { + pam_syslog (pamh, LOG_ERR, "error saving old audit status"); + close (fd); + free (old_status); + return PAM_SESSION_ERR; + } + + if (nl_send (fd, AUDIT_TTY_SET, NLM_F_ACK, &new_status, + sizeof (new_status)) != 0 + || nl_recv_ack (fd) != 0) + { + pam_syslog (pamh, LOG_ERR, "error setting current audit status: %m"); + close (fd); + if (open_only != 0) + free (old_status); + return PAM_SESSION_ERR; + } + /* Fall through */ + ok_fd: + close (fd); + pam_syslog (pamh, LOG_DEBUG, "changed status from %d to %d", + old_status->enabled, new_status.enabled); + if (open_only != 0) + free (old_status); + return PAM_SUCCESS; +} + +int +pam_sm_close_session (pam_handle_t *pamh, int flags, int argc, + const char **argv) +{ + const void *status_; + + (void)flags; + (void)argc; + (void)argv; + if (pam_get_data (pamh, DATANAME, &status_) == PAM_SUCCESS) + { + const struct audit_tty_status *status; + int fd; + + status = status_; + + fd = nl_open (); + if (fd == -1 + || nl_send (fd, AUDIT_TTY_SET, NLM_F_ACK, status, + sizeof (*status)) != 0 + || nl_recv_ack (fd) != 0) + { + pam_syslog (pamh, LOG_ERR, "error restoring audit status: %m"); + if (fd != -1) + close (fd); + return PAM_SESSION_ERR; + } + close (fd); + pam_syslog (pamh, LOG_ERR, "restored status to %d", status->enabled); + } + return PAM_SUCCESS; +} + +/* static module data */ +#ifdef PAM_STATIC +struct pam_module _pam_tty_audit_modstruct = { + "pam_tty_audit", + NULL, + NULL, + NULL, + pam_sm_open_session, + pam_sm_close_session, + NULL +}; +#endif diff --git a/modules/pam_umask/Makefile.am b/modules/pam_umask/Makefile.am new file mode 100644 index 00000000..53a666aa --- /dev/null +++ b/modules/pam_umask/Makefile.am @@ -0,0 +1,32 @@ +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README $(MANS) $(XMLS) tst-pam_umask + +man_MANS = pam_umask.8 + +XMLS = README.xml pam_umask.8.xml + +TESTS = tst-pam_umask + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_umask.la +pam_umask_la_LIBADD = -L$(top_builddir)/libpam -lpam + +if ENABLE_REGENERATE_MAN +noinst_DATA = README +README: pam_umask.8.xml +-include $(top_srcdir)/Make.xml.rules +endif + diff --git a/modules/pam_umask/Makefile.in b/modules/pam_umask/Makefile.in new file mode 100644 index 00000000..3a4176e9 --- /dev/null +++ b/modules/pam_umask/Makefile.in @@ -0,0 +1,667 @@ +# Makefile.in generated by automake 1.10.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 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+@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_umask/README b/modules/pam_umask/README new file mode 100644 index 00000000..69003ec3 --- /dev/null +++ b/modules/pam_umask/README @@ -0,0 +1,58 @@ +pam_umask — PAM module to set the file mode creation mask + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +pam_umask is a PAM module to set the file mode creation mask of the current +environment. The umask affects the default permissions assigned to newly +created files. + +The PAM module tries to get the umask value from the following places in the +following order: + + â— umask= argument + + â— umask= entry of the users GECOS field + + â— pri= entry of the users GECOS field + + â— ulimit= entry of the users GECOS field + + â— UMASK= entry from /etc/default/login + + â— UMASK entry from /etc/login.defs + +OPTIONS + +debug + + Print debug information. + +silent + + Don't print informative messages. + +usergroups + + If the user is not root, and the user ID is equal to the group ID, and the + username is the same as primary group name, the umask group bits are set to + be the same as owner bits (examples: 022 -> 002, 077 -> 007). + +umask=mask + + Sets the calling process's file mode creation mask (umask) to mask & 0777. + The value is interpreted as Octal. + +EXAMPLES + +Add the following line to /etc/pam.d/login to set the user specific umask at +login: + + session optional pam_umask.so umask=0022 + + +AUTHOR + +pam_umask was written by Thorsten Kukuk <kukuk@thkukuk.de>. + diff --git a/modules/pam_umask/README.xml b/modules/pam_umask/README.xml new file mode 100644 index 00000000..9afbe543 --- /dev/null +++ b/modules/pam_umask/README.xml @@ -0,0 +1,41 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_umask.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_umask.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_umask-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_umask.8.xml" xpointer='xpointer(//refsect1[@id = "pam_umask-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_umask.8.xml" xpointer='xpointer(//refsect1[@id = "pam_umask-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_umask.8.xml" xpointer='xpointer(//refsect1[@id = "pam_umask-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_umask.8.xml" xpointer='xpointer(//refsect1[@id = "pam_umask-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_umask/pam_umask.8 b/modules/pam_umask/pam_umask.8 new file mode 100644 index 00000000..7098f107 --- /dev/null +++ b/modules/pam_umask/pam_umask.8 @@ -0,0 +1,116 @@ +.\" Title: pam_umask +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_UMASK" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_umask - PAM module to set the file mode creation mask +.SH "SYNOPSIS" +.HP 13 +\fBpam_umask\.so\fR [debug] [silent] [usergroups] [umask=\fImask\fR] +.SH "DESCRIPTION" +.PP +pam_umask is a PAM module to set the file mode creation mask of the current environment\. The umask affects the default permissions assigned to newly created files\. +.PP +The PAM module tries to get the umask value from the following places in the following order: +.sp +.RS 4 +\h'-04'\(bu\h'+03'umask= argument +.RE +.sp +.RS 4 +\h'-04'\(bu\h'+03'umask= entry of the users GECOS field +.RE +.sp +.RS 4 +\h'-04'\(bu\h'+03'pri= entry of the users GECOS field +.RE +.sp +.RS 4 +\h'-04'\(bu\h'+03'ulimit= entry of the users GECOS field +.RE +.sp +.RS 4 +\h'-04'\(bu\h'+03'UMASK= entry from /etc/default/login +.RE +.sp +.RS 4 +\h'-04'\(bu\h'+03'UMASK entry from /etc/login\.defs +.RE +.sp +.RE +.SH "OPTIONS" +.PP +.PP +\fBdebug\fR +.RS 4 +Print debug information\. +.RE +.PP +\fBsilent\fR +.RS 4 +Don\'t print informative messages\. +.RE +.PP +\fBusergroups\fR +.RS 4 +If the user is not root, and the user ID is equal to the group ID, and the username is the same as primary group name, the umask group bits are set to be the same as owner bits (examples: 022 \-> 002, 077 \-> 007)\. +.RE +.PP +\fBumask=\fR\fB\fImask\fR\fR +.RS 4 +Sets the calling process\'s file mode creation mask (umask) to +\fBmask\fR +& 0777\. The value is interpreted as Octal\. +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +Only the +\fBsession\fR +service is supported\. +.SH "RETURN VALUES" +.PP +.PP +PAM_SUCCESS +.RS 4 +The new umask was set successfull\. +.RE +.PP +PAM_SERVICE_ERR +.RS 4 +No username was given\. +.RE +.PP +PAM_USER_UNKNOWN +.RS 4 +User not known\. +.RE +.SH "EXAMPLES" +.PP +Add the following line to +\fI/etc/pam\.d/login\fR +to set the user specific umask at login: +.sp +.RS 4 +.nf + session optional pam_umask\.so umask=0022 + +.fi +.RE +.sp +.SH "SEE ALSO" +.PP + +\fBpam.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_umask was written by Thorsten Kukuk <kukuk@thkukuk\.de>\. diff --git a/modules/pam_umask/pam_umask.8.xml b/modules/pam_umask/pam_umask.8.xml new file mode 100644 index 00000000..d65e6660 --- /dev/null +++ b/modules/pam_umask/pam_umask.8.xml @@ -0,0 +1,220 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_umask"> + + <refmeta> + <refentrytitle>pam_umask</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_umask-name"> + <refname>pam_umask</refname> + <refpurpose>PAM module to set the file mode creation mask</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_umask-cmdsynopsis"> + <command>pam_umask.so</command> + <arg choice="opt"> + debug + </arg> + <arg choice="opt"> + silent + </arg> + <arg choice="opt"> + usergroups + </arg> + <arg choice="opt"> + umask=<replaceable>mask</replaceable> + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_umask-description"> + + <title>DESCRIPTION</title> + + <para> + pam_umask is a PAM module to set the file mode creation mask + of the current environment. The umask affects the default + permissions assigned to newly created files. + </para> + <para> + The PAM module tries to get the umask value from the + following places in the following order: + <itemizedlist> + <listitem> + <para> + umask= argument + </para> + </listitem> + <listitem> + <para> + umask= entry of the users GECOS field + </para> + </listitem> + <listitem> + <para> + pri= entry of the users GECOS field + </para> + </listitem> + <listitem> + <para> + ulimit= entry of the users GECOS field + </para> + </listitem> + <listitem> + <para> + UMASK= entry from /etc/default/login + </para> + </listitem> + <listitem> + <para> + UMASK entry from /etc/login.defs + </para> + </listitem> + </itemizedlist> + </para> + + </refsect1> + + <refsect1 id="pam_umask-options"> + + <title>OPTIONS</title> + <para> + <variablelist> + + <varlistentry> + <term> + <option>debug</option> + </term> + <listitem> + <para> + Print debug information. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>silent</option> + </term> + <listitem> + <para> + Don't print informative messages. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>usergroups</option> + </term> + <listitem> + <para> + If the user is not root, and the user ID is equal to the + group ID, and the username is the same as primary group name, + the umask group bits are set to be the same as + owner bits (examples: 022 -> 002, 077 -> 007). + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>umask=<replaceable>mask</replaceable></option> + </term> + <listitem> + <para> + Sets the calling process's file mode creation mask (umask) + to <option>mask</option> & 0777. The value is interpreted + as Octal. + </para> + </listitem> + </varlistentry> + + </variablelist> + + </para> + </refsect1> + + <refsect1 id="pam_umask-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + Only the <option>session</option> service is supported. + </para> + </refsect1> + + <refsect1 id='pam_umask-return_values'> + <title>RETURN VALUES</title> + <para> + <variablelist> + + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + The new umask was set successfull. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_SERVICE_ERR</term> + <listitem> + <para> + No username was given. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_USER_UNKNOWN</term> + <listitem> + <para> + User not known. + </para> + </listitem> + </varlistentry> + + </variablelist> + </para> + </refsect1> + + <refsect1 id='pam_umask-examples'> + <title>EXAMPLES</title> + <para> + Add the following line to <filename>/etc/pam.d/login</filename> to + set the user specific umask at login: + <programlisting> + session optional pam_umask.so umask=0022 + </programlisting> + </para> + </refsect1> + + <refsect1 id='pam_umask-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_umask-author'> + <title>AUTHOR</title> + <para> + pam_umask was written by Thorsten Kukuk <kukuk@thkukuk.de>. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_umask/pam_umask.c b/modules/pam_umask/pam_umask.c new file mode 100644 index 00000000..eb88c1ac --- /dev/null +++ b/modules/pam_umask/pam_umask.c @@ -0,0 +1,319 @@ +/* + * Copyright (c) 2005, 2006, 2007 Thorsten Kukuk <kukuk@thkukuk.de> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, and the entire permission notice in its entirety, + * including the disclaimer of warranties. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * ALTERNATIVELY, this product may be distributed under the terms of + * the GNU Public License V2, in which case the provisions of the GPL + * are required INSTEAD OF the above restrictions. (This clause is + * necessary due to a potential bad interaction between the GPL and + * the restrictions contained in a BSD-style copyright.) + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include "config.h" + +#include <pwd.h> +#include <grp.h> +#include <stdio.h> +#include <ctype.h> +#include <errno.h> +#include <limits.h> +#include <string.h> +#include <stdarg.h> +#include <unistd.h> +#include <stdlib.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <sys/resource.h> +#include <syslog.h> + +#define PAM_SM_SESSION + +#include <security/pam_modules.h> +#include <security/pam_modutil.h> +#include <security/pam_ext.h> + +#define BUF_SIZE 4096 +#define LOGIN_DEFS "/etc/login.defs" +#define LOGIN_CONF "/etc/default/login" + +struct options_t { + int debug; + int usergroups; + int silent; + char *umask; +}; +typedef struct options_t options_t; + +static void +parse_option (const pam_handle_t *pamh, const char *argv, options_t *options) +{ + if (argv == NULL || argv[0] == '\0') + return; + + if (strcasecmp (argv, "debug") == 0) + options->debug = 1; + else if (strncasecmp (argv, "umask=", 6) == 0) + options->umask = strdup (&argv[6]); + else if (strcasecmp (argv, "usergroups") == 0) + options->usergroups = 1; + else if (strcasecmp (argv, "silent") == 0) + options->silent = 1; + else + pam_syslog (pamh, LOG_ERR, "Unknown option: `%s'", argv); +} + +static char * +search_key (const char *filename) +{ + FILE *fp; + char *buf = NULL; + size_t buflen = 0; + char *retval = NULL; + + fp = fopen (filename, "r"); + if (NULL == fp) + return NULL; + + while (!feof (fp)) + { + char *tmp, *cp; +#if defined(HAVE_GETLINE) + ssize_t n = getline (&buf, &buflen, fp); +#elif defined (HAVE_GETDELIM) + ssize_t n = getdelim (&buf, &buflen, '\n', fp); +#else + ssize_t n; + + if (buf == NULL) + { + buflen = BUF_SIZE; + buf = malloc (buflen); + } + buf[0] = '\0'; + if (fgets (buf, buflen - 1, fp) == NULL) + break; + else if (buf != NULL) + n = strlen (buf); + else + n = 0; +#endif /* HAVE_GETLINE / HAVE_GETDELIM */ + cp = buf; + + if (n < 1) + break; + + tmp = strchr (cp, '#'); /* remove comments */ + if (tmp) + *tmp = '\0'; + while (isspace ((int)*cp)) /* remove spaces and tabs */ + ++cp; + if (*cp == '\0') /* ignore empty lines */ + continue; + + if (cp[strlen (cp) - 1] == '\n') + cp[strlen (cp) - 1] = '\0'; + + tmp = strsep (&cp, " \t="); + if (cp != NULL) + while (isspace ((int)*cp) || *cp == '=') + ++cp; + + if (strcasecmp (tmp, "UMASK") == 0) + { + retval = strdup (cp); + break; + } + } + fclose (fp); + + free (buf); + + return retval; +} + +static int +get_options (const pam_handle_t *pamh, options_t *options, + int argc, const char **argv) +{ + memset (options, 0, sizeof (options_t)); + /* Parse parameters for module */ + for ( ; argc-- > 0; argv++) + parse_option (pamh, *argv, options); + + if (options->umask == NULL) + options->umask = search_key (LOGIN_DEFS); + if (options->umask == NULL) + options->umask = search_key (LOGIN_CONF); + + return 0; +} + +static void +set_umask (const char *value) +{ + const char *value_orig = value; + mode_t mask; + char *endptr; + + mask = strtoul (value, &endptr, 8) & 0777; + if (((mask == 0) && (value_orig == endptr)) || + ((mask == UINT_MAX) && (errno == ERANGE))) + return; + umask (mask); + return; +} + +/* Set the process nice, ulimit, and umask from the + password file entry. */ +static void +setup_limits_from_gecos (pam_handle_t *pamh, options_t *options, + struct passwd *pw) +{ + char *cp; + + if (options->usergroups) + { + /* if not root, and UID == GID, and username is the same as + primary group name, set umask group bits to be the same as + owner bits (examples: 022 -> 002, 077 -> 007). */ + if (pw->pw_uid != 0 && pw->pw_uid == pw->pw_gid) + { + struct group *grp = pam_modutil_getgrgid (pamh, pw->pw_gid); + if (grp && (strcmp (pw->pw_name, grp->gr_name) == 0)) + { + mode_t oldmask = umask (0777); + umask ((oldmask & ~070) | ((oldmask >> 3) & 070)); + } + } + } + + /* See if the GECOS field contains values for NICE, UMASK or ULIMIT. */ + for (cp = pw->pw_gecos; cp != NULL; cp = strchr (cp, ',')) + { + if (*cp == ',') + cp++; + + if (strncasecmp (cp, "umask=", 6) == 0) + umask (strtol (cp + 6, NULL, 8) & 0777); + else if (strncasecmp (cp, "pri=", 4) == 0) + { + errno = 0; + if (nice (strtol (cp + 4, NULL, 10)) == -1 && errno != 0) + { + if (!options->silent || options->debug) + pam_error (pamh, "nice failed: %m\n"); + pam_syslog (pamh, LOG_ERR, "nice failed: %m"); + } + } + else if (strncasecmp (cp, "ulimit=", 7) == 0) + { + struct rlimit rlimit_fsize; + rlimit_fsize.rlim_cur = 512L * strtol (cp + 7, NULL, 10); + rlimit_fsize.rlim_max = rlimit_fsize.rlim_cur; + if (setrlimit (RLIMIT_FSIZE, &rlimit_fsize) == -1) + { + if (!options->silent || options->debug) + pam_error (pamh, "setrlimit failed: %m\n"); + pam_syslog (pamh, LOG_ERR, "setrlimit failed: %m"); + } + } + } +} + + +PAM_EXTERN int +pam_sm_open_session (pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + struct passwd *pw; + options_t options; + const char *name; + int retval = PAM_SUCCESS; + + get_options (pamh, &options, argc, argv); + if (flags & PAM_SILENT) + options.silent = 1; + + /* get the user name. */ + if ((retval = pam_get_user (pamh, &name, NULL)) != PAM_SUCCESS) + { + pam_syslog (pamh, LOG_ERR, "pam_get_user failed: return %d", retval); + return (retval == PAM_CONV_AGAIN ? PAM_INCOMPLETE:retval); + } + + if (name == NULL || name[0] == '\0') + { + if (name) + { + pam_syslog (pamh, LOG_ERR, "bad username [%s]", name); + return PAM_USER_UNKNOWN; + } + return PAM_SERVICE_ERR; + } + + pw = pam_modutil_getpwnam (pamh, name); + if (pw == NULL) + { + pam_syslog (pamh, LOG_ERR, "account for %s not found", name); + return PAM_USER_UNKNOWN; + } + + if (options.umask != NULL) + { + set_umask (options.umask); + free (options.umask); + } + + setup_limits_from_gecos (pamh, &options, pw); + + return retval; +} + +PAM_EXTERN int +pam_sm_close_session (pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_SUCCESS; +} + +#ifdef PAM_STATIC + +/* static module data */ + +struct pam_module _pam_umask_modstruct = { + "pam_umask", + NULL, + NULL, + NULL, + pam_sm_open_session, + pam_sm_close_session, + NULL +}; + +#endif + +/* end of module definition */ diff --git a/modules/pam_umask/tst-pam_umask b/modules/pam_umask/tst-pam_umask new file mode 100755 index 00000000..3608a9de --- /dev/null +++ b/modules/pam_umask/tst-pam_umask @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_umask.so diff --git a/modules/pam_unix/CHANGELOG b/modules/pam_unix/CHANGELOG new file mode 100644 index 00000000..509ce0a3 --- /dev/null +++ b/modules/pam_unix/CHANGELOG @@ -0,0 +1,55 @@ +$Id: CHANGELOG,v 1.1.1.1 2000/06/20 22:12:01 agmorgan Exp $ + +* Mon Aug 16 1999 Jan Rêkorajski <baggins@pld.org.pl> +- fixed reentrancy problems + +* Sun Jul 4 21:03:42 PDT 1999 + +- temporarily removed the crypt16 stuff. I'm really paranoid about + crypto stuff and exporting it, and there are a few too many 's-box' + references in the code for my liking.. + +* Wed Jun 30 1999 Steve Langasek <vorlon@netexpress.net> +- further NIS+ fixes + +* Sun Jun 27 1999 Steve Langasek <vorlon@netexpress.net> +- fix to uid-handling code for NIS+ + +* Sat Jun 26 1999 Jan Rêkorajski <baggins@mimuw.edu.pl> +- merged MD5 fix and early failure syslog + by Andrey Vladimirovich Savochkin <saw@msu.ru> +- minor fixes +- added signal handler to unix_chkpwd + +* Fri Jun 25 1999 Stephen Langasek <vorlon@netexpress.net> +- reorganized the code to let it build as separate C files + +* Sun Jun 20 1999 Jan Rêkorajski <baggins@mimuw.edu.pl> +- fixes in pam_unix_auth, it incorrectly saved and restored return + value when likeauth option was used + +* Tue Jun 15 1999 Jan Rêkorajski <baggins@mimuw.edu.pl> +- added NIS+ support + +* Mon Jun 14 1999 Jan Rêkorajski <baggins@mimuw.edu.pl> +- total rewrite based on pam_pwdb module, now there is ONE pam_unix.so + module, it accepts the same options as pam_pwdb - all of them correctly ;) + (pam_pwdb dosn't understand what DISALLOW_NULL_AUTHTOK means) + +* Tue Apr 20 1999 Jan Rêkorajski <baggins@mimuw.edu.pl> +- Arghhh, pam_unix_passwd was not updating /etc/shadow when used with + pam_cracklib. + +* Mon Apr 19 1999 Jan Rêkorajski <baggins@mimuw.edu.pl> +- added "remember=XXX" option that means 'remember XXX old passwords' + Old passwords are stored in /etc/security/opasswd, there can be + maximum of 400 passwords per user. + +* Sat Mar 27 1999 Jan Rêkorajski <baggins@mimuw.edu.pl> +- added crypt16 to pam_unix_auth and pam_unix_passwd (check only, this algorithm + is too lame to use it in real life) + +* Sun Mar 21 1999 Jan Rêkorajski <baggins@mimuw.edu.pl> +- pam_unix_auth now correctly behave when user has NULL AUTHTOK +- pam_unix_auth returns PAM_PERM_DENIED when seteuid fails + diff --git a/modules/pam_unix/Makefile.am b/modules/pam_unix/Makefile.am new file mode 100644 index 00000000..61a3b0ce --- /dev/null +++ b/modules/pam_unix/Makefile.am @@ -0,0 +1,66 @@ +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README md5.c md5_crypt.c lckpwdf.-c $(MANS) CHANGELOG \ + tst-pam_unix $(XMLS) + +man_MANS = pam_unix.8 unix_chkpwd.8 unix_update.8 +XMLS = README.xml pam_unix.8.xml unix_chkpwd.8.xml unix_update.8.xml + +TESTS = tst-pam_unix + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include \ + -DCHKPWD_HELPER=\"$(sbindir)/unix_chkpwd\" \ + -DUPDATE_HELPER=\"$(sbindir)/unix_update\" + +if HAVE_LIBSELINUX + AM_CFLAGS += -D"WITH_SELINUX" +endif + +pam_unix_la_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + pam_unix_la_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif +pam_unix_la_LIBADD = @LIBNSL@ -L$(top_builddir)/libpam -lpam \ + @LIBCRYPT@ @LIBSELINUX@ + +securelib_LTLIBRARIES = pam_unix.la + +noinst_HEADERS = md5.h support.h yppasswd.h bigcrypt.h passverify.h + +sbin_PROGRAMS = unix_chkpwd unix_update + +noinst_PROGRAMS = bigcrypt + +pam_unix_la_SOURCES = bigcrypt.c pam_unix_acct.c \ + pam_unix_auth.c pam_unix_passwd.c pam_unix_sess.c support.c \ + passverify.c yppasswd_xdr.c md5_good.c md5_broken.c + +bigcrypt_SOURCES = bigcrypt.c bigcrypt_main.c +bigcrypt_CFLAGS = $(AM_CFLAGS) +bigcrypt_LDADD = @LIBCRYPT@ + +unix_chkpwd_SOURCES = unix_chkpwd.c md5_good.c md5_broken.c bigcrypt.c \ + passverify.c +unix_chkpwd_CFLAGS = $(AM_CFLAGS) @PIE_CFLAGS@ -DHELPER_COMPILE=\"unix_chkpwd\" +unix_chkpwd_LDFLAGS = @PIE_LDFLAGS@ +unix_chkpwd_LDADD = @LIBCRYPT@ @LIBSELINUX@ + +unix_update_SOURCES = unix_update.c md5_good.c md5_broken.c bigcrypt.c \ + passverify.c +unix_update_CFLAGS = $(AM_CFLAGS) @PIE_CFLAGS@ -DHELPER_COMPILE=\"unix_update\" +unix_update_LDFLAGS = @PIE_LDFLAGS@ +unix_update_LDADD = @LIBCRYPT@ @LIBSELINUX@ + +if ENABLE_REGENERATE_MAN +noinst_DATA = README +README: pam_unix.8.xml +-include $(top_srcdir)/Make.xml.rules +endif + diff --git a/modules/pam_unix/Makefile.in b/modules/pam_unix/Makefile.in new file mode 100644 index 00000000..200a72b6 --- /dev/null +++ b/modules/pam_unix/Makefile.in @@ -0,0 +1,974 @@ +# Makefile.in generated by automake 1.10.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY, to the extent permitted by law; without +# even the implied warranty of MERCHANTABILITY or FITNESS FOR A +# PARTICULAR PURPOSE. + +@SET_MAKE@ + +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + + + + +VPATH = 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install-pdf install-pdf-am install-ps \ + install-ps-am install-sbinPROGRAMS \ + install-securelibLTLIBRARIES install-strip installcheck \ + installcheck-am installdirs maintainer-clean \ + maintainer-clean-generic mostlyclean mostlyclean-compile \ + mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \ + tags uninstall uninstall-am uninstall-man uninstall-man8 \ + uninstall-sbinPROGRAMS uninstall-securelibLTLIBRARIES + +@ENABLE_REGENERATE_MAN_TRUE@README: pam_unix.8.xml +@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_unix/README b/modules/pam_unix/README new file mode 100644 index 00000000..fb2efab4 --- /dev/null +++ b/modules/pam_unix/README @@ -0,0 +1,159 @@ +pam_unix — Module for traditional password authentication + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +This is the standard Unix authentication module. It uses standard calls from +the system's libraries to retrieve and set account information as well as +authentication. Usually this is obtained from the /etc/passwd and the /etc/ +shadow file as well if shadow is enabled. + +The account component performs the task of establishing the status of the +user's account and password based on the following shadow elements: expire, +last_change, max_change, min_change, warn_change. In the case of the latter, it +may offer advice to the user on changing their password or, through the +PAM_AUTHTOKEN_REQD return, delay giving service to the user until they have +established a new password. The entries listed above are documented in the +shadow(5) manual page. Should the user's record not contain one or more of +these entries, the corresponding shadow check is not performed. + +The authentication component performs the task of checking the users +credentials (password). The default action of this module is to not permit the +user access to a service if their official password is blank. + +A helper binary, unix_chkpwd(8), is provided to check the user's password when +it is stored in a read protected database. This binary is very simple and will +only check the password of the user invoking it. It is called transparently on +behalf of the user by the authenticating component of this module. In this way +it is possible for applications like xlock(1) to work without being +setuid-root. The module, by default, will temporarily turn off SIGCHLD handling +for the duration of execution of the helper binary. This is generally the right +thing to do, as many applications are not prepared to handle this signal from a +child they didn't know was fork()d. The noreap module argument can be used to +suppress this temporary shielding and may be needed for use with certain +applications. + +The password component of this module performs the task of updating the user's +password. + +The session component of this module logs when a user logins or leave the +system. + +Remaining arguments, supported by others functions of this module, are silently +ignored. Other arguments are logged as errors through syslog(3). + +OPTIONS + +debug + + Turns on debugging via syslog(3). + +audit + + A little more extreme than debug. + +nullok + + The default action of this module is to not permit the user access to a + service if their official password is blank. The nullok argument overrides + this default. + +try_first_pass + + Before prompting the user for their password, the module first tries the + previous stacked module's password in case that satisfies this module as + well. + +use_first_pass + + The argument use_first_pass forces the module to use a previous stacked + modules password and will never prompt the user - if no password is + available or the password is not appropriate, the user will be denied + access. + +nodelay + + This argument can be used to discourage the authentication component from + requesting a delay should the authentication as a whole fail. The default + action is for the module to request a delay-on-failure of the order of two + second. + +use_authtok + + When password changing enforce the module to set the new password to the + one provided by a previously stacked password module (this is used in the + example of the stacking of the pam_cracklib module documented above). + +not_set_pass + + This argument is used to inform the module that it is not to pay attention + to/make available the old or new passwords from/to other (stacked) password + modules. + +nis + + NIS RPC is used for setting new passwords. + +remember=n + + The last n passwords for each user are saved in /etc/security/opasswd in + order to force password change history and keep the user from alternating + between the same password too frequently. + +shadow + + Try to maintain a shadow based system. + +md5 + + When a user changes their password next, encrypt it with the MD5 algorithm. + +bigcrypt + + When a user changes their password next, encrypt it with the DEC C2 + algorithm. + +sha256 + + When a user changes their password next, encrypt it with the SHA256 + algorithm. If the SHA256 algorithm is not known to the libcrypt, fall back + to MD5. + +sha512 + + When a user changes their password next, encrypt it with the SHA512 + algorithm. If the SHA512 algorithm is not known to the libcrypt, fall back + to MD5. + +rounds=n + + Set the optional number of rounds of the SHA256 and SHA512 password hashing + algorithms to n. + +broken_shadow + + Ignore errors reading shadow inforation for users in the account management + module. + +Invalid arguments are logged with syslog(3). + +EXAMPLES + +An example usage for /etc/pam.d/login would be: + +# Authenticate the user +auth required pam_unix.so +# Ensure users account and password are still active +account required pam_unix.so +# Change the users password, but at first check the strength +# with pam_cracklib(8) +password required pam_cracklib.so retry=3 minlen=6 difok=3 +password required pam_unix.so use_authtok nullok md5 +session required pam_unix.so + + +AUTHOR + +pam_unix was written by various people. + diff --git a/modules/pam_unix/README.xml b/modules/pam_unix/README.xml new file mode 100644 index 00000000..7fd340b3 --- /dev/null +++ b/modules/pam_unix/README.xml @@ -0,0 +1,41 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_unix.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_unix.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_unix-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_unix.8.xml" xpointer='xpointer(//refsect1[@id = "pam_unix-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_unix.8.xml" xpointer='xpointer(//refsect1[@id = "pam_unix-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_unix.8.xml" xpointer='xpointer(//refsect1[@id = "pam_unix-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_unix.8.xml" xpointer='xpointer(//refsect1[@id = "pam_unix-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_unix/bigcrypt.c b/modules/pam_unix/bigcrypt.c new file mode 100644 index 00000000..9cd55384 --- /dev/null +++ b/modules/pam_unix/bigcrypt.c @@ -0,0 +1,148 @@ +/* + * This function implements the "bigcrypt" algorithm specifically for + * Linux-PAM. + * + * This algorithm is algorithm 0 (default) shipped with the C2 secure + * implementation of Digital UNIX. + * + * Disclaimer: This work is not based on the source code to Digital + * UNIX, nor am I connected to Digital Equipment Corp, in any way + * other than as a customer. This code is based on published + * interfaces and reasonable guesswork. + * + * Description: The cleartext is divided into blocks of SEGMENT_SIZE=8 + * characters or less. Each block is encrypted using the standard UNIX + * libc crypt function. The result of the encryption for one block + * provides the salt for the suceeding block. + * + * Restrictions: The buffer used to hold the encrypted result is + * statically allocated. (see MAX_PASS_LEN below). This is necessary, + * as the returned pointer points to "static data that are overwritten + * by each call", (XPG3: XSI System Interface + Headers pg 109), and + * this is a drop in replacement for crypt(); + * + * Andy Phillips <atp@mssl.ucl.ac.uk> + */ + +#include "config.h" + +#include <string.h> +#include <stdlib.h> +#include <security/_pam_macros.h> +#ifdef HAVE_CRYPT_H +#include <crypt.h> +#endif + +#include "bigcrypt.h" + +/* + * Max cleartext password length in segments of 8 characters this + * function can deal with (16 segments of 8 chars= max 128 character + * password). + */ + +#define MAX_PASS_LEN 16 +#define SEGMENT_SIZE 8 +#define SALT_SIZE 2 +#define KEYBUF_SIZE ((MAX_PASS_LEN*SEGMENT_SIZE)+SALT_SIZE) +#define ESEGMENT_SIZE 11 +#define CBUF_SIZE ((MAX_PASS_LEN*ESEGMENT_SIZE)+SALT_SIZE+1) + +char *bigcrypt(const char *key, const char *salt) +{ + char *dec_c2_cryptbuf; +#ifdef HAVE_CRYPT_R + struct crypt_data *cdata; +#endif + unsigned long int keylen, n_seg, j; + char *cipher_ptr, *plaintext_ptr, *tmp_ptr, *salt_ptr; + char keybuf[KEYBUF_SIZE + 1]; + + D(("called with key='%s', salt='%s'.", key, salt)); + + /* reset arrays */ + dec_c2_cryptbuf = malloc(CBUF_SIZE); + if (!dec_c2_cryptbuf) { + return NULL; + } +#ifdef HAVE_CRYPT_R + cdata = malloc(sizeof(*cdata)); + if(!cdata) { + free(dec_c2_cryptbuf); + return NULL; + } + cdata->initialized = 0; +#endif + memset(keybuf, 0, KEYBUF_SIZE + 1); + memset(dec_c2_cryptbuf, 0, CBUF_SIZE); + + /* fill KEYBUF_SIZE with key */ + strncpy(keybuf, key, KEYBUF_SIZE); + + /* deal with case that we are doing a password check for a + conventially encrypted password: the salt will be + SALT_SIZE+ESEGMENT_SIZE long. */ + if (strlen(salt) == (SALT_SIZE + ESEGMENT_SIZE)) + keybuf[SEGMENT_SIZE] = '\0'; /* terminate password early(?) */ + + keylen = strlen(keybuf); + + if (!keylen) { + n_seg = 1; + } else { + /* work out how many segments */ + n_seg = 1 + ((keylen - 1) / SEGMENT_SIZE); + } + + if (n_seg > MAX_PASS_LEN) + n_seg = MAX_PASS_LEN; /* truncate at max length */ + + /* set up some pointers */ + cipher_ptr = dec_c2_cryptbuf; + plaintext_ptr = keybuf; + + /* do the first block with supplied salt */ +#ifdef HAVE_CRYPT_R + tmp_ptr = crypt_r(plaintext_ptr, salt, cdata); /* libc crypt_r() */ +#else + tmp_ptr = crypt(plaintext_ptr, salt); /* libc crypt() */ +#endif + /* and place in the static area */ + strncpy(cipher_ptr, tmp_ptr, 13); + cipher_ptr += ESEGMENT_SIZE + SALT_SIZE; + plaintext_ptr += SEGMENT_SIZE; /* first block of SEGMENT_SIZE */ + + /* change the salt (1st 2 chars of previous block) - this was found + by dowsing */ + + salt_ptr = cipher_ptr - ESEGMENT_SIZE; + + /* so far this is identical to "return crypt(key, salt);", if + there is more than one block encrypt them... */ + + if (n_seg > 1) { + for (j = 2; j <= n_seg; j++) { + +#ifdef HAVE_CRYPT_R + tmp_ptr = crypt_r(plaintext_ptr, salt_ptr, cdata); +#else + tmp_ptr = crypt(plaintext_ptr, salt_ptr); +#endif + + /* skip the salt for seg!=0 */ + strncpy(cipher_ptr, (tmp_ptr + SALT_SIZE), ESEGMENT_SIZE); + + cipher_ptr += ESEGMENT_SIZE; + plaintext_ptr += SEGMENT_SIZE; + salt_ptr = cipher_ptr - ESEGMENT_SIZE; + } + } + D(("key=|%s|, salt=|%s|\nbuf=|%s|\n", key, salt, dec_c2_cryptbuf)); + +#ifdef HAVE_CRYPT_R + free(cdata); +#endif + + /* this is the <NUL> terminated encrypted password */ + return dec_c2_cryptbuf; +} diff --git a/modules/pam_unix/bigcrypt.h b/modules/pam_unix/bigcrypt.h new file mode 100644 index 00000000..a66a96e6 --- /dev/null +++ b/modules/pam_unix/bigcrypt.h @@ -0,0 +1 @@ +extern char *bigcrypt(const char *key, const char *salt); diff --git a/modules/pam_unix/bigcrypt_main.c b/modules/pam_unix/bigcrypt_main.c new file mode 100644 index 00000000..fab212d9 --- /dev/null +++ b/modules/pam_unix/bigcrypt_main.c @@ -0,0 +1,18 @@ +#include <stdio.h> +#include <string.h> + +#include "bigcrypt.h" + +int +main(int argc, char **argv) +{ + if (argc < 3) { + fprintf(stderr, "Usage: %s password salt\n", + strchr(argv[0], '/') ? + (strchr(argv[0], '/') + 1) : + argv[0]); + return 0; + } + fprintf(stdout, "%s\n", bigcrypt(argv[1], argv[2])); + return 0; +} diff --git a/modules/pam_unix/lckpwdf.-c b/modules/pam_unix/lckpwdf.-c new file mode 100644 index 00000000..7145617e --- /dev/null +++ b/modules/pam_unix/lckpwdf.-c @@ -0,0 +1,142 @@ +/* + * This is a hack, but until libc and glibc both include this function + * by default (libc only includes it if nys is not being used, at the + * moment, and glibc doesn't appear to have it at all) we need to have + * it here, too. :-( + * + * This should not become an official part of PAM. + * + * BEGIN_HACK + */ + +/* + * lckpwdf.c -- prevent simultaneous updates of password files + * + * Before modifying any of the password files, call lckpwdf(). It may block + * for up to 15 seconds trying to get the lock. Return value is 0 on success + * or -1 on failure. When you are done, call ulckpwdf() to release the lock. + * The lock is also released automatically when the process exits. Only one + * process at a time may hold the lock. + * + * These functions are supposed to be conformant with AT&T SVID Issue 3. + * + * Written by Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>, + * public domain. + */ + +#include <fcntl.h> +#include <signal.h> +#ifdef WITH_SELINUX +#include <selinux/selinux.h> +#endif + +#define LOCKFILE "/etc/.pwd.lock" +#define TIMEOUT 15 + +static int lockfd = -1; + +static int set_close_on_exec(int fd) +{ + int flags = fcntl(fd, F_GETFD, 0); + if (flags == -1) + return -1; + flags |= FD_CLOEXEC; + return fcntl(fd, F_SETFD, flags); +} + +static int do_lock(int fd) +{ + struct flock fl; + + memset(&fl, 0, sizeof fl); + fl.l_type = F_WRLCK; + fl.l_whence = SEEK_SET; + return fcntl(fd, F_SETLKW, &fl); +} + +static void alarm_catch(int sig) +{ +/* does nothing, but fcntl F_SETLKW will fail with EINTR */ +} + +static int lckpwdf(void) +{ + struct sigaction act, oldact; + sigset_t set, oldset; + + if (lockfd != -1) + return -1; + +#ifdef WITH_SELINUX + if(is_selinux_enabled()>0) + { + lockfd = open(LOCKFILE, O_WRONLY); + if(lockfd == -1 && errno == ENOENT) + { + security_context_t create_context; + int rc; + + if(getfilecon("/etc/passwd", &create_context)) + return -1; + rc = setfscreatecon(create_context); + freecon(create_context); + if(rc) + return -1; + lockfd = open(LOCKFILE, O_CREAT | O_WRONLY, 0600); + if(setfscreatecon(NULL)) + return -1; + } + } + else +#endif + lockfd = open(LOCKFILE, O_CREAT | O_WRONLY, 0600); + if (lockfd == -1) + return -1; + if (set_close_on_exec(lockfd) == -1) + goto cleanup_fd; + + memset(&act, 0, sizeof act); + act.sa_handler = alarm_catch; + act.sa_flags = 0; + sigfillset(&act.sa_mask); + if (sigaction(SIGALRM, &act, &oldact) == -1) + goto cleanup_fd; + + sigemptyset(&set); + sigaddset(&set, SIGALRM); + if (sigprocmask(SIG_UNBLOCK, &set, &oldset) == -1) + goto cleanup_sig; + + alarm(TIMEOUT); + if (do_lock(lockfd) == -1) + goto cleanup_alarm; + alarm(0); + sigprocmask(SIG_SETMASK, &oldset, NULL); + sigaction(SIGALRM, &oldact, NULL); + return 0; + + cleanup_alarm: + alarm(0); + sigprocmask(SIG_SETMASK, &oldset, NULL); + cleanup_sig: + sigaction(SIGALRM, &oldact, NULL); + cleanup_fd: + close(lockfd); + lockfd = -1; + return -1; +} + +static int ulckpwdf(void) +{ + unlink(LOCKFILE); + if (lockfd == -1) + return -1; + + if (close(lockfd) == -1) { + lockfd = -1; + return -1; + } + lockfd = -1; + return 0; +} +/* END_HACK */ diff --git a/modules/pam_unix/md5.c b/modules/pam_unix/md5.c new file mode 100644 index 00000000..7ee9ed00 --- /dev/null +++ b/modules/pam_unix/md5.c @@ -0,0 +1,256 @@ +/* + * $Id: md5.c,v 1.1.1.1 2000/06/20 22:12:03 agmorgan Exp $ + * + * This code implements the MD5 message-digest algorithm. + * The algorithm is due to Ron Rivest. This code was + * written by Colin Plumb in 1993, no copyright is claimed. + * This code is in the public domain; do with it what you wish. + * + * Equivalent code is available from RSA Data Security, Inc. + * This code has been tested against that, and is equivalent, + * except that you don't need to include two pages of legalese + * with every copy. + * + * To compute the message digest of a chunk of bytes, declare an + * MD5Context structure, pass it to MD5Init, call MD5Update as + * needed on buffers full of bytes, and then call MD5Final, which + * will fill a supplied 16-byte array with the digest. + * + */ + +#include <string.h> +#include "md5.h" + +#ifndef HIGHFIRST +#define byteReverse(buf, len) /* Nothing */ +#else +static void byteReverse(unsigned char *buf, unsigned longs); + +#ifndef ASM_MD5 +/* + * Note: this code is harmless on little-endian machines. + */ +static void byteReverse(unsigned char *buf, unsigned longs) +{ + uint32 t; + do { + t = (uint32) ((unsigned) buf[3] << 8 | buf[2]) << 16 | + ((unsigned) buf[1] << 8 | buf[0]); + *(uint32 *) buf = t; + buf += 4; + } while (--longs); +} +#endif +#endif + +/* + * Start MD5 accumulation. Set bit count to 0 and buffer to mysterious + * initialization constants. + */ +void MD5Name(MD5Init)(struct MD5Context *ctx) +{ + ctx->buf[0] = 0x67452301U; + ctx->buf[1] = 0xefcdab89U; + ctx->buf[2] = 0x98badcfeU; + ctx->buf[3] = 0x10325476U; + + ctx->bits[0] = 0; + ctx->bits[1] = 0; +} + +/* + * Update context to reflect the concatenation of another buffer full + * of bytes. + */ +void MD5Name(MD5Update)(struct MD5Context *ctx, unsigned const char *buf, unsigned len) +{ + uint32 t; + + /* Update bitcount */ + + t = ctx->bits[0]; + if ((ctx->bits[0] = t + ((uint32) len << 3)) < t) + ctx->bits[1]++; /* Carry from low to high */ + ctx->bits[1] += len >> 29; + + t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */ + + /* Handle any leading odd-sized chunks */ + + if (t) { + unsigned char *p = (unsigned char *) ctx->in + t; + + t = 64 - t; + if (len < t) { + memcpy(p, buf, len); + return; + } + memcpy(p, buf, t); + byteReverse(ctx->in, 16); + MD5Name(MD5Transform)(ctx->buf, (uint32 *) ctx->in); + buf += t; + len -= t; + } + /* Process data in 64-byte chunks */ + + while (len >= 64) { + memcpy(ctx->in, buf, 64); + byteReverse(ctx->in, 16); + MD5Name(MD5Transform)(ctx->buf, (uint32 *) ctx->in); + buf += 64; + len -= 64; + } + + /* Handle any remaining bytes of data. */ + + memcpy(ctx->in, buf, len); +} + +/* + * Final wrapup - pad to 64-byte boundary with the bit pattern + * 1 0* (64-bit count of bits processed, MSB-first) + */ +void MD5Name(MD5Final)(unsigned char digest[16], struct MD5Context *ctx) +{ + unsigned count; + unsigned char *p; + + /* Compute number of bytes mod 64 */ + count = (ctx->bits[0] >> 3) & 0x3F; + + /* Set the first char of padding to 0x80. This is safe since there is + always at least one byte free */ + p = ctx->in + count; + *p++ = 0x80; + + /* Bytes of padding needed to make 64 bytes */ + count = 64 - 1 - count; + + /* Pad out to 56 mod 64 */ + if (count < 8) { + /* Two lots of padding: Pad the first block to 64 bytes */ + memset(p, 0, count); + byteReverse(ctx->in, 16); + MD5Name(MD5Transform)(ctx->buf, (uint32 *) ctx->in); + + /* Now fill the next block with 56 bytes */ + memset(ctx->in, 0, 56); + } else { + /* Pad block to 56 bytes */ + memset(p, 0, count - 8); + } + byteReverse(ctx->in, 14); + + /* Append length in bits and transform */ + ((uint32 *) ctx->in)[14] = ctx->bits[0]; + ((uint32 *) ctx->in)[15] = ctx->bits[1]; + + MD5Name(MD5Transform)(ctx->buf, (uint32 *) ctx->in); + byteReverse((unsigned char *) ctx->buf, 4); + memcpy(digest, ctx->buf, 16); + memset(ctx, 0, sizeof(ctx)); /* In case it's sensitive */ +} + +#ifndef ASM_MD5 + +/* The four core functions - F1 is optimized somewhat */ + +/* #define F1(x, y, z) (x & y | ~x & z) */ +#define F1(x, y, z) (z ^ (x & (y ^ z))) +#define F2(x, y, z) F1(z, x, y) +#define F3(x, y, z) (x ^ y ^ z) +#define F4(x, y, z) (y ^ (x | ~z)) + +/* This is the central step in the MD5 algorithm. */ +#define MD5STEP(f, w, x, y, z, data, s) \ + ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x ) + +/* + * The core of the MD5 algorithm, this alters an existing MD5 hash to + * reflect the addition of 16 longwords of new data. MD5Update blocks + * the data and converts bytes into longwords for this routine. + */ +void MD5Name(MD5Transform)(uint32 buf[4], uint32 const in[16]) +{ + register uint32 a, b, c, d; + + a = buf[0]; + b = buf[1]; + c = buf[2]; + d = buf[3]; + + MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478U, 7); + MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756U, 12); + MD5STEP(F1, c, d, a, b, in[2] + 0x242070dbU, 17); + MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceeeU, 22); + MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0fafU, 7); + MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62aU, 12); + MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613U, 17); + MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501U, 22); + MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8U, 7); + MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7afU, 12); + MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1U, 17); + MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7beU, 22); + MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122U, 7); + MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193U, 12); + MD5STEP(F1, c, d, a, b, in[14] + 0xa679438eU, 17); + MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821U, 22); + + MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562U, 5); + MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340U, 9); + MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51U, 14); + MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aaU, 20); + MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105dU, 5); + MD5STEP(F2, d, a, b, c, in[10] + 0x02441453U, 9); + MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681U, 14); + MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8U, 20); + MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6U, 5); + MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6U, 9); + MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87U, 14); + MD5STEP(F2, b, c, d, a, in[8] + 0x455a14edU, 20); + MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905U, 5); + MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8U, 9); + MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9U, 14); + MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8aU, 20); + + MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942U, 4); + MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681U, 11); + MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122U, 16); + MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380cU, 23); + MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44U, 4); + MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9U, 11); + MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60U, 16); + MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70U, 23); + MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6U, 4); + MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127faU, 11); + MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085U, 16); + MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05U, 23); + MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039U, 4); + MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5U, 11); + MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8U, 16); + MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665U, 23); + + MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244U, 6); + MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97U, 10); + MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7U, 15); + MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039U, 21); + MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3U, 6); + MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92U, 10); + MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47dU, 15); + MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1U, 21); + MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4fU, 6); + MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0U, 10); + MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314U, 15); + MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1U, 21); + MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82U, 6); + MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235U, 10); + MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bbU, 15); + MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391U, 21); + + buf[0] += a; + buf[1] += b; + buf[2] += c; + buf[3] += d; +} + +#endif diff --git a/modules/pam_unix/md5.h b/modules/pam_unix/md5.h new file mode 100644 index 00000000..103f168a --- /dev/null +++ b/modules/pam_unix/md5.h @@ -0,0 +1,31 @@ + +#ifndef MD5_H +#define MD5_H + +typedef unsigned int uint32; + +struct MD5Context { + uint32 buf[4]; + uint32 bits[2]; + unsigned char in[64]; +}; + +void GoodMD5Init(struct MD5Context *); +void GoodMD5Update(struct MD5Context *, unsigned const char *, unsigned); +void GoodMD5Final(unsigned char digest[16], struct MD5Context *); +void GoodMD5Transform(uint32 buf[4], uint32 const in[16]); +void BrokenMD5Init(struct MD5Context *); +void BrokenMD5Update(struct MD5Context *, unsigned const char *, unsigned); +void BrokenMD5Final(unsigned char digest[16], struct MD5Context *); +void BrokenMD5Transform(uint32 buf[4], uint32 const in[16]); + +char *Goodcrypt_md5(const char *pw, const char *salt); +char *Brokencrypt_md5(const char *pw, const char *salt); + +/* + * This is needed to make RSAREF happy on some MS-DOS compilers. + */ + +typedef struct MD5Context MD5_CTX; + +#endif /* MD5_H */ diff --git a/modules/pam_unix/md5_broken.c b/modules/pam_unix/md5_broken.c new file mode 100644 index 00000000..193daebb --- /dev/null +++ b/modules/pam_unix/md5_broken.c @@ -0,0 +1,4 @@ +#define MD5Name(x) Broken##x + +#include "md5.c" +#include "md5_crypt.c" diff --git a/modules/pam_unix/md5_crypt.c b/modules/pam_unix/md5_crypt.c new file mode 100644 index 00000000..8b7bc66b --- /dev/null +++ b/modules/pam_unix/md5_crypt.c @@ -0,0 +1,154 @@ +/* + * $Id: md5_crypt.c,v 1.2 2001/07/10 20:24:16 vorlon Exp $ + * + * ---------------------------------------------------------------------------- + * "THE BEER-WARE LICENSE" (Revision 42): + * <phk@login.dknet.dk> wrote this file. As long as you retain this notice you + * can do whatever you want with this stuff. If we meet some day, and you think + * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp + * ---------------------------------------------------------------------------- + * + * Origin: Id: crypt.c,v 1.3 1995/05/30 05:42:22 rgrimes Exp + * + */ + +#include <string.h> +#include <stdlib.h> +#include "md5.h" + +static unsigned char itoa64[] = /* 0 ... 63 => ascii - 64 */ +"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; + +static void to64(char *s, unsigned long v, int n) +{ + while (--n >= 0) { + *s++ = itoa64[v & 0x3f]; + v >>= 6; + } +} + +/* + * UNIX password + * + * Use MD5 for what it is best at... + */ + +char *MD5Name(crypt_md5)(const char *pw, const char *salt) +{ + const char *magic = "$1$"; + /* This string is magic for this algorithm. Having + * it this way, we can get get better later on */ + char *passwd, *p; + const char *sp, *ep; + unsigned char final[16]; + int sl, pl, i, j; + MD5_CTX ctx, ctx1; + unsigned long l; + + /* Refine the Salt first */ + sp = salt; + + /* TODO: now that we're using malloc'ed memory, get rid of the + strange constant buffer size. */ + passwd = malloc(120); + + /* If it starts with the magic string, then skip that */ + if (!strncmp(sp, magic, strlen(magic))) + sp += strlen(magic); + + /* It stops at the first '$', max 8 chars */ + for (ep = sp; *ep && *ep != '$' && ep < (sp + 8); ep++) + continue; + + /* get the length of the true salt */ + sl = ep - sp; + + MD5Name(MD5Init)(&ctx); + + /* The password first, since that is what is most unknown */ + MD5Name(MD5Update)(&ctx,(unsigned const char *)pw,strlen(pw)); + + /* Then our magic string */ + MD5Name(MD5Update)(&ctx,(unsigned const char *)magic,strlen(magic)); + + /* Then the raw salt */ + MD5Name(MD5Update)(&ctx,(unsigned const char *)sp,sl); + + /* Then just as many characters of the MD5(pw,salt,pw) */ + MD5Name(MD5Init)(&ctx1); + MD5Name(MD5Update)(&ctx1,(unsigned const char *)pw,strlen(pw)); + MD5Name(MD5Update)(&ctx1,(unsigned const char *)sp,sl); + MD5Name(MD5Update)(&ctx1,(unsigned const char *)pw,strlen(pw)); + MD5Name(MD5Final)(final,&ctx1); + for (pl = strlen(pw); pl > 0; pl -= 16) + MD5Name(MD5Update)(&ctx,(unsigned const char *)final,pl>16 ? 16 : pl); + + /* Don't leave anything around in vm they could use. */ + memset(final, 0, sizeof final); + + /* Then something really weird... */ + for (j = 0, i = strlen(pw); i; i >>= 1) + if (i & 1) + MD5Name(MD5Update)(&ctx, (unsigned const char *)final+j, 1); + else + MD5Name(MD5Update)(&ctx, (unsigned const char *)pw+j, 1); + + /* Now make the output string */ + strcpy(passwd, magic); + strncat(passwd, sp, sl); + strcat(passwd, "$"); + + MD5Name(MD5Final)(final,&ctx); + + /* + * and now, just to make sure things don't run too fast + * On a 60 Mhz Pentium this takes 34 msec, so you would + * need 30 seconds to build a 1000 entry dictionary... + */ + for (i = 0; i < 1000; i++) { + MD5Name(MD5Init)(&ctx1); + if (i & 1) + MD5Name(MD5Update)(&ctx1,(unsigned const char *)pw,strlen(pw)); + else + MD5Name(MD5Update)(&ctx1,(unsigned const char *)final,16); + + if (i % 3) + MD5Name(MD5Update)(&ctx1,(unsigned const char *)sp,sl); + + if (i % 7) + MD5Name(MD5Update)(&ctx1,(unsigned const char *)pw,strlen(pw)); + + if (i & 1) + MD5Name(MD5Update)(&ctx1,(unsigned const char *)final,16); + else + MD5Name(MD5Update)(&ctx1,(unsigned const char *)pw,strlen(pw)); + MD5Name(MD5Final)(final,&ctx1); + } + + p = passwd + strlen(passwd); + + l = (final[0] << 16) | (final[6] << 8) | final[12]; + to64(p, l, 4); + p += 4; + l = (final[1] << 16) | (final[7] << 8) | final[13]; + to64(p, l, 4); + p += 4; + l = (final[2] << 16) | (final[8] << 8) | final[14]; + to64(p, l, 4); + p += 4; + l = (final[3] << 16) | (final[9] << 8) | final[15]; + to64(p, l, 4); + p += 4; + l = (final[4] << 16) | (final[10] << 8) | final[5]; + to64(p, l, 4); + p += 4; + l = final[11]; + to64(p, l, 2); + p += 2; + *p = '\0'; + + /* Don't leave anything around in vm they could use. */ + memset(final, 0, sizeof final); + + return passwd; +} diff --git a/modules/pam_unix/md5_good.c b/modules/pam_unix/md5_good.c new file mode 100644 index 00000000..131e4516 --- /dev/null +++ b/modules/pam_unix/md5_good.c @@ -0,0 +1,5 @@ +#define HIGHFIRST +#define MD5Name(x) Good##x + +#include "md5.c" +#include "md5_crypt.c" diff --git a/modules/pam_unix/pam_unix.8 b/modules/pam_unix/pam_unix.8 new file mode 100644 index 00000000..2f0d0008 --- /dev/null +++ b/modules/pam_unix/pam_unix.8 @@ -0,0 +1,189 @@ +.\" Title: pam_unix +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_UNIX" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_unix - Module for traditional password authentication +.SH "SYNOPSIS" +.HP 12 +\fBpam_unix\.so\fR [\.\.\.] +.SH "DESCRIPTION" +.PP +This is the standard Unix authentication module\. It uses standard calls from the system\'s libraries to retrieve and set account information as well as authentication\. Usually this is obtained from the /etc/passwd and the /etc/shadow file as well if shadow is enabled\. +.PP +The account component performs the task of establishing the status of the user\'s account and password based on the following +\fIshadow\fR +elements: expire, last_change, max_change, min_change, warn_change\. In the case of the latter, it may offer advice to the user on changing their password or, through the +\fBPAM_AUTHTOKEN_REQD\fR +return, delay giving service to the user until they have established a new password\. The entries listed above are documented in the +\fBshadow\fR(5) +manual page\. Should the user\'s record not contain one or more of these entries, the corresponding +\fIshadow\fR +check is not performed\. +.PP +The authentication component performs the task of checking the users credentials (password)\. The default action of this module is to not permit the user access to a service if their official password is blank\. +.PP +A helper binary, +\fBunix_chkpwd\fR(8), is provided to check the user\'s password when it is stored in a read protected database\. This binary is very simple and will only check the password of the user invoking it\. It is called transparently on behalf of the user by the authenticating component of this module\. In this way it is possible for applications like +\fBxlock\fR(1) +to work without being setuid\-root\. The module, by default, will temporarily turn off SIGCHLD handling for the duration of execution of the helper binary\. This is generally the right thing to do, as many applications are not prepared to handle this signal from a child they didn\'t know was +\fBfork()\fRd\. The +\fBnoreap\fR +module argument can be used to suppress this temporary shielding and may be needed for use with certain applications\. +.PP +The password component of this module performs the task of updating the user\'s password\. +.PP +The session component of this module logs when a user logins or leave the system\. +.PP +Remaining arguments, supported by others functions of this module, are silently ignored\. Other arguments are logged as errors through +\fBsyslog\fR(3)\. +.SH "OPTIONS" +.PP +\fBdebug\fR +.RS 4 +Turns on debugging via +\fBsyslog\fR(3)\. +.RE +.PP +\fBaudit\fR +.RS 4 +A little more extreme than debug\. +.RE +.PP +\fBnullok\fR +.RS 4 +The default action of this module is to not permit the user access to a service if their official password is blank\. The +\fBnullok\fR +argument overrides this default\. +.RE +.PP +\fBtry_first_pass\fR +.RS 4 +Before prompting the user for their password, the module first tries the previous stacked module\'s password in case that satisfies this module as well\. +.RE +.PP +\fBuse_first_pass\fR +.RS 4 +The argument +\fBuse_first_pass\fR +forces the module to use a previous stacked modules password and will never prompt the user \- if no password is available or the password is not appropriate, the user will be denied access\. +.RE +.PP +\fBnodelay\fR +.RS 4 +This argument can be used to discourage the authentication component from requesting a delay should the authentication as a whole fail\. The default action is for the module to request a delay\-on\-failure of the order of two second\. +.RE +.PP +\fBuse_authtok\fR +.RS 4 +When password changing enforce the module to set the new password to the one provided by a previously stacked +\fBpassword\fR +module (this is used in the example of the stacking of the +\fBpam_cracklib\fR +module documented above)\. +.RE +.PP +\fBnot_set_pass\fR +.RS 4 +This argument is used to inform the module that it is not to pay attention to/make available the old or new passwords from/to other (stacked) password modules\. +.RE +.PP +\fBnis\fR +.RS 4 +NIS RPC is used for setting new passwords\. +.RE +.PP +\fBremember=\fR\fB\fIn\fR\fR +.RS 4 +The last +\fIn\fR +passwords for each user are saved in +\fI/etc/security/opasswd\fR +in order to force password change history and keep the user from alternating between the same password too frequently\. +.RE +.PP +\fBshadow\fR +.RS 4 +Try to maintain a shadow based system\. +.RE +.PP +\fBmd5\fR +.RS 4 +When a user changes their password next, encrypt it with the MD5 algorithm\. +.RE +.PP +\fBbigcrypt\fR +.RS 4 +When a user changes their password next, encrypt it with the DEC C2 algorithm\. +.RE +.PP +\fBsha256\fR +.RS 4 +When a user changes their password next, encrypt it with the SHA256 algorithm\. If the SHA256 algorithm is not known to the libcrypt, fall back to MD5\. +.RE +.PP +\fBsha512\fR +.RS 4 +When a user changes their password next, encrypt it with the SHA512 algorithm\. If the SHA512 algorithm is not known to the libcrypt, fall back to MD5\. +.RE +.PP +\fBrounds=\fR\fB\fIn\fR\fR +.RS 4 +Set the optional number of rounds of the SHA256 and SHA512 password hashing algorithms to +\fIn\fR\. +.RE +.PP +\fBbroken_shadow\fR +.RS 4 +Ignore errors reading shadow inforation for users in the account management module\. +.RE +.PP +Invalid arguments are logged with +\fBsyslog\fR(3)\. +.SH "MODULE SERVICES PROVIDED" +.PP +All service are supported\. +.SH "RETURN VALUES" +.PP +PAM_IGNORE +.RS 4 +Ignore this module\. +.RE +.SH "EXAMPLES" +.PP +An example usage for +\fI/etc/pam\.d/login\fR +would be: +.sp +.RS 4 +.nf +# Authenticate the user +auth required pam_unix\.so +# Ensure users account and password are still active +account required pam_unix\.so +# Change the users password, but at first check the strength +# with pam_cracklib(8) +password required pam_cracklib\.so retry=3 minlen=6 difok=3 +password required pam_unix\.so use_authtok nullok md5 +session required pam_unix\.so + +.fi +.RE +.sp +.SH "SEE ALSO" +.PP + +\fBpam.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_unix was written by various people\. diff --git a/modules/pam_unix/pam_unix.8.xml b/modules/pam_unix/pam_unix.8.xml new file mode 100644 index 00000000..290cb2b9 --- /dev/null +++ b/modules/pam_unix/pam_unix.8.xml @@ -0,0 +1,379 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_unix"> + + <refmeta> + <refentrytitle>pam_unix</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_unix-name"> + <refname>pam_unix</refname> + <refpurpose>Module for traditional password authentication</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_unix-cmdsynopsis"> + <command>pam_unix.so</command> + <arg choice="opt"> + ... + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_unix-description"> + + <title>DESCRIPTION</title> + + <para> + This is the standard Unix authentication module. It uses standard + calls from the system's libraries to retrieve and set account + information as well as authentication. Usually this is obtained + from the /etc/passwd and the /etc/shadow file as well if shadow is + enabled. + </para> + + <para> + The account component performs the task of establishing the status + of the user's account and password based on the following + <emphasis>shadow</emphasis> elements: expire, last_change, max_change, + min_change, warn_change. In the case of the latter, it may offer advice + to the user on changing their password or, through the + <emphasis remap='B'>PAM_AUTHTOKEN_REQD</emphasis> return, delay + giving service to the user until they have established a new password. + The entries listed above are documented in the <citerefentry> + <refentrytitle>shadow</refentrytitle><manvolnum>5</manvolnum> + </citerefentry> manual page. Should the user's record not contain + one or more of these entries, the corresponding + <emphasis>shadow</emphasis> check is not performed. + </para> + + <para> + The authentication component performs the task of checking the + users credentials (password). The default action of this module + is to not permit the user access to a service if their official + password is blank. + </para> + + <para> + A helper binary, <citerefentry> + <refentrytitle>unix_chkpwd</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, is provided + to check the user's password when it is stored in a read + protected database. This binary is very simple and will only + check the password of the user invoking it. It is called + transparently on behalf of the user by the authenticating + component of this module. In this way it is possible + for applications like <citerefentry> + <refentrytitle>xlock</refentrytitle><manvolnum>1</manvolnum> + </citerefentry> to work without + being setuid-root. The module, by default, will temporarily turn + off SIGCHLD handling for the duration of execution of the helper + binary. This is generally the right thing to do, as many applications + are not prepared to handle this signal from a child they didn't know + was <function>fork()</function>d. The <option>noreap</option> module + argument can be used to suppress this temporary shielding and may be + needed for use with certain applications. + </para> + + <para> + The password component of this module performs the task of updating + the user's password. + </para> + + <para> + The session component of this module logs when a user logins + or leave the system. + </para> + + <para> + Remaining arguments, supported by others functions of this + module, are silently ignored. Other arguments are logged as + errors through <citerefentry> + <refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum> + </citerefentry>. + </para> + </refsect1> + + <refsect1 id="pam_unix-options"> + + <title>OPTIONS</title> + <variablelist> + <varlistentry> + <term> + <option>debug</option> + </term> + <listitem> + <para> + Turns on debugging via + <citerefentry> + <refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum> + </citerefentry>. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>audit</option> + </term> + <listitem> + <para> + A little more extreme than debug. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>nullok</option> + </term> + <listitem> + <para> + The default action of this module is to not permit the + user access to a service if their official password is blank. + The <option>nullok</option> argument overrides this default. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>try_first_pass</option> + </term> + <listitem> + <para> + Before prompting the user for their password, the module first + tries the previous stacked module's password in case that + satisfies this module as well. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>use_first_pass</option> + </term> + <listitem> + <para> + The argument <option>use_first_pass</option> forces the module + to use a previous stacked modules password and will never prompt + the user - if no password is available or the password is not + appropriate, the user will be denied access. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>nodelay</option> + </term> + <listitem> + <para> + This argument can be used to discourage the authentication + component from requesting a delay should the authentication + as a whole fail. The default action is for the module to + request a delay-on-failure of the order of two second. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>use_authtok</option> + </term> + <listitem> + <para> + When password changing enforce the module to set the new + password to the one provided by a previously stacked + <option>password</option> module (this is used in the + example of the stacking of the <command>pam_cracklib</command> + module documented above). + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>not_set_pass</option> + </term> + <listitem> + <para> + This argument is used to inform the module that it is not to + pay attention to/make available the old or new passwords from/to + other (stacked) password modules. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>nis</option> + </term> + <listitem> + <para> + NIS RPC is used for setting new passwords. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>remember=<replaceable>n</replaceable></option> + </term> + <listitem> + <para> + The last <replaceable>n</replaceable> passwords for each + user are saved in <filename>/etc/security/opasswd</filename> + in order to force password change history and keep the user + from alternating between the same password too frequently. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>shadow</option> + </term> + <listitem> + <para> + Try to maintain a shadow based system. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>md5</option> + </term> + <listitem> + <para> + When a user changes their password next, encrypt + it with the MD5 algorithm. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>bigcrypt</option> + </term> + <listitem> + <para> + When a user changes their password next, + encrypt it with the DEC C2 algorithm. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>sha256</option> + </term> + <listitem> + <para> + When a user changes their password next, + encrypt it with the SHA256 algorithm. If the + SHA256 algorithm is not known to the libcrypt, + fall back to MD5. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>sha512</option> + </term> + <listitem> + <para> + When a user changes their password next, + encrypt it with the SHA512 algorithm. If the + SHA512 algorithm is not known to the libcrypt, + fall back to MD5. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>rounds=<replaceable>n</replaceable></option> + </term> + <listitem> + <para> + Set the optional number of rounds of the SHA256 and SHA512 + password hashing algorithms to <replaceable>n</replaceable>. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>broken_shadow</option> + </term> + <listitem> + <para> + Ignore errors reading shadow inforation for + users in the account management module. + </para> + </listitem> + </varlistentry> + </variablelist> + <para> + Invalid arguments are logged with <citerefentry> + <refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum> + </citerefentry>. + </para> + </refsect1> + + <refsect1 id="pam_unix-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + All service are supported. + </para> + </refsect1> + + <refsect1 id='pam_unix-return_values'> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_IGNORE</term> + <listitem> + <para> + Ignore this module. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id='pam_unix-examples'> + <title>EXAMPLES</title> + <para> + An example usage for <filename>/etc/pam.d/login</filename> + would be: + <programlisting> +# Authenticate the user +auth required pam_unix.so +# Ensure users account and password are still active +account required pam_unix.so +# Change the users password, but at first check the strength +# with pam_cracklib(8) +password required pam_cracklib.so retry=3 minlen=6 difok=3 +password required pam_unix.so use_authtok nullok md5 +session required pam_unix.so + </programlisting> + </para> + </refsect1> + + <refsect1 id='pam_unix-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_unix-author'> + <title>AUTHOR</title> + <para> + pam_unix was written by various people. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_unix/pam_unix_acct.c b/modules/pam_unix/pam_unix_acct.c new file mode 100644 index 00000000..c09bc175 --- /dev/null +++ b/modules/pam_unix/pam_unix_acct.c @@ -0,0 +1,297 @@ +/* + * Copyright Elliot Lee, 1996. All rights reserved. + * Copyright Jan Rêkorajski, 1999. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, and the entire permission notice in its entirety, + * including the disclaimer of warranties. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * ALTERNATIVELY, this product may be distributed under the terms of + * the GNU Public License, in which case the provisions of the GPL are + * required INSTEAD OF the above restrictions. (This clause is + * necessary due to a potential bad interaction between the GPL and + * the restrictions contained in a BSD-style copyright.) + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include "config.h" + +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <unistd.h> +#include <sys/types.h> +#include <syslog.h> +#include <pwd.h> +#include <shadow.h> +#include <time.h> /* for time() */ +#include <errno.h> +#include <sys/wait.h> + +#include <security/_pam_macros.h> + +/* indicate that the following groups are defined */ + +#define PAM_SM_ACCOUNT + +#include <security/pam_modules.h> +#include <security/pam_ext.h> +#include <security/pam_modutil.h> + +#include "support.h" +#include "passverify.h" + +int _unix_run_verify_binary(pam_handle_t *pamh, unsigned int ctrl, + const char *user, int *daysleft) +{ + int retval=0, child, fds[2]; + void (*sighandler)(int) = NULL; + D(("running verify_binary")); + + /* create a pipe for the messages */ + if (pipe(fds) != 0) { + D(("could not make pipe")); + pam_syslog(pamh, LOG_ERR, "Could not make pipe: %m"); + return PAM_AUTH_ERR; + } + D(("called.")); + + if (off(UNIX_NOREAP, ctrl)) { + /* + * This code arranges that the demise of the child does not cause + * the application to receive a signal it is not expecting - which + * may kill the application or worse. + * + * The "noreap" module argument is provided so that the admin can + * override this behavior. + */ + sighandler = signal(SIGCHLD, SIG_DFL); + } + + /* fork */ + child = fork(); + if (child == 0) { + size_t i=0; + struct rlimit rlim; + static char *envp[] = { NULL }; + char *args[] = { NULL, NULL, NULL, NULL }; + + close(0); close(1); + /* reopen stdin as pipe */ + close(fds[0]); + dup2(fds[1], STDOUT_FILENO); + + /* XXX - should really tidy up PAM here too */ + + if (getrlimit(RLIMIT_NOFILE,&rlim)==0) { + for (i=2; i < rlim.rlim_max; i++) { + if ((unsigned int)fds[1] != i) { + close(i); + } + } + } + + if (geteuid() == 0) { + /* must set the real uid to 0 so the helper will not error + out if pam is called from setuid binary (su, sudo...) */ + setuid(0); + } + + /* exec binary helper */ + args[0] = x_strdup(CHKPWD_HELPER); + args[1] = x_strdup(user); + args[2] = x_strdup("chkexpiry"); + + execve(CHKPWD_HELPER, args, envp); + + pam_syslog(pamh, LOG_ERR, "helper binary execve failed: %m"); + /* should not get here: exit with error */ + close (fds[1]); + D(("helper binary is not available")); + printf("-1\n"); + exit(PAM_AUTHINFO_UNAVAIL); + } else { + close(fds[1]); + if (child > 0) { + char buf[32]; + int rc=0; + rc=waitpid(child, &retval, 0); /* wait for helper to complete */ + if (rc<0) { + pam_syslog(pamh, LOG_ERR, "unix_chkpwd waitpid returned %d: %m", rc); + retval = PAM_AUTH_ERR; + } else { + retval = WEXITSTATUS(retval); + rc = pam_modutil_read(fds[0], buf, sizeof(buf) - 1); + if(rc > 0) { + buf[rc] = '\0'; + if (sscanf(buf,"%d", daysleft) != 1 ) + retval = PAM_AUTH_ERR; + } + else { + pam_syslog(pamh, LOG_ERR, "read unix_chkpwd output error %d: %m", rc); + retval = PAM_AUTH_ERR; + } + } + } else { + pam_syslog(pamh, LOG_ERR, "Fork failed: %m"); + D(("fork failed")); + retval = PAM_AUTH_ERR; + } + close(fds[0]); + } + if (sighandler != SIG_ERR) { + (void) signal(SIGCHLD, sighandler); /* restore old signal handler */ + } + D(("Returning %d",retval)); + return retval; +} + +/* + * PAM framework looks for this entry-point to pass control to the + * account management module. + */ + +PAM_EXTERN int pam_sm_acct_mgmt(pam_handle_t * pamh, int flags, + int argc, const char **argv) +{ + unsigned int ctrl; + const void *void_uname; + const char *uname; + int retval, daysleft; + struct spwd *spent; + struct passwd *pwent; + char buf[256]; + + D(("called.")); + + ctrl = _set_ctrl(pamh, flags, NULL, NULL, argc, argv); + + retval = pam_get_item(pamh, PAM_USER, &void_uname); + uname = void_uname; + D(("user = `%s'", uname)); + if (retval != PAM_SUCCESS || uname == NULL) { + pam_syslog(pamh, LOG_ALERT, + "could not identify user (from uid=%lu)", + (unsigned long int)getuid()); + return PAM_USER_UNKNOWN; + } + + retval = get_account_info(pamh, uname, &pwent, &spent); + if (retval == PAM_USER_UNKNOWN) { + pam_syslog(pamh, LOG_ALERT, + "could not identify user (from getpwnam(%s))", + uname); + return retval; + } + + if (retval == PAM_SUCCESS && spent == NULL) + return PAM_SUCCESS; + + if (retval == PAM_UNIX_RUN_HELPER) { + retval = _unix_run_verify_binary(pamh, ctrl, uname, &daysleft); + if (retval == PAM_AUTHINFO_UNAVAIL && + on(UNIX_BROKEN_SHADOW, ctrl)) + return PAM_SUCCESS; + } else if (retval != PAM_SUCCESS) { + if (on(UNIX_BROKEN_SHADOW,ctrl)) + return PAM_SUCCESS; + else + return retval; + } else + retval = check_shadow_expiry(pamh, spent, &daysleft); + + switch (retval) { + case PAM_ACCT_EXPIRED: + pam_syslog(pamh, LOG_NOTICE, + "account %s has expired (account expired)", + uname); + _make_remark(pamh, ctrl, PAM_ERROR_MSG, + _("Your account has expired; please contact your system administrator")); + break; + case PAM_NEW_AUTHTOK_REQD: + if (daysleft == 0) { + pam_syslog(pamh, LOG_NOTICE, + "expired password for user %s (root enforced)", + uname); + _make_remark(pamh, ctrl, PAM_ERROR_MSG, + _("You are required to change your password immediately (root enforced)")); + } else { + pam_syslog(pamh, LOG_DEBUG, + "expired password for user %s (password aged)", + uname); + _make_remark(pamh, ctrl, PAM_ERROR_MSG, + _("You are required to change your password immediately (password aged)")); + } + break; + case PAM_AUTHTOK_EXPIRED: + pam_syslog(pamh, LOG_NOTICE, + "account %s has expired (failed to change password)", + uname); + _make_remark(pamh, ctrl, PAM_ERROR_MSG, + _("Your account has expired; please contact your system administrator")); + break; + case PAM_SUCCESS: + if (daysleft >= 0) { + pam_syslog(pamh, LOG_DEBUG, + "password for user %s will expire in %d days", + uname, daysleft); +#if defined HAVE_DNGETTEXT && defined ENABLE_NLS + snprintf (buf, sizeof (buf), + dngettext(PACKAGE, + "Warning: your password will expire in %d day", + "Warning: your password will expire in %d days", + daysleft), + daysleft); +#else + if (daysleft == 1) + snprintf(buf, sizeof (buf), + _("Warning: your password will expire in %d day"), + daysleft); + else + snprintf(buf, sizeof (buf), + /* TRANSLATORS: only used if dngettext is not supported */ + _("Warning: your password will expire in %d days"), + daysleft); +#endif + _make_remark(pamh, ctrl, PAM_TEXT_INFO, buf); + } + } + + D(("all done")); + + return retval; +} + + +/* static module data */ +#ifdef PAM_STATIC +struct pam_module _pam_unix_acct_modstruct = { + "pam_unix_acct", + NULL, + NULL, + pam_sm_acct_mgmt, + NULL, + NULL, + NULL, +}; +#endif diff --git a/modules/pam_unix/pam_unix_auth.c b/modules/pam_unix/pam_unix_auth.c new file mode 100644 index 00000000..dfedd608 --- /dev/null +++ b/modules/pam_unix/pam_unix_auth.c @@ -0,0 +1,229 @@ +/* + * Copyright Alexander O. Yuriev, 1996. All rights reserved. + * NIS+ support by Thorsten Kukuk <kukuk@weber.uni-paderborn.de> + * Copyright Jan Rêkorajski, 1999. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, and the entire permission notice in its entirety, + * including the disclaimer of warranties. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * ALTERNATIVELY, this product may be distributed under the terms of + * the GNU Public License, in which case the provisions of the GPL are + * required INSTEAD OF the above restrictions. (This clause is + * necessary due to a potential bad interaction between the GPL and + * the restrictions contained in a BSD-style copyright.) + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +/* #define DEBUG */ + +#include "config.h" + +#include <stdio.h> +#include <stdlib.h> +#include <stdarg.h> +#include <string.h> +#include <unistd.h> +#include <fcntl.h> +#include <ctype.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <syslog.h> + +/* indicate the following groups are defined */ + +#define PAM_SM_AUTH + +#define _PAM_EXTERN_FUNCTIONS +#include <security/_pam_macros.h> +#include <security/pam_modules.h> +#include <security/pam_ext.h> + +#include "support.h" + +/* + * PAM framework looks for these entry-points to pass control to the + * authentication module. + */ + +/* Fun starts here :) + + * pam_sm_authenticate() performs UNIX/shadow authentication + * + * First, if shadow support is available, attempt to perform + * authentication using shadow passwords. If shadow is not + * available, or user does not have a shadow password, fallback + * onto a normal UNIX authentication + */ + +#define _UNIX_AUTHTOK "-UN*X-PASS" + +#define AUTH_RETURN \ +do { \ + if (on(UNIX_LIKE_AUTH, ctrl) && ret_data) { \ + D(("recording return code for next time [%d]", \ + retval)); \ + *ret_data = retval; \ + pam_set_data(pamh, "unix_setcred_return", \ + (void *) ret_data, setcred_free); \ + } else if (ret_data) \ + free (ret_data); \ + D(("done. [%s]", pam_strerror(pamh, retval))); \ + return retval; \ +} while (0) + + +static void +setcred_free (pam_handle_t *pamh UNUSED, void *ptr, int err UNUSED) +{ + if (ptr) + free (ptr); +} + + +PAM_EXTERN int pam_sm_authenticate(pam_handle_t * pamh, int flags + ,int argc, const char **argv) +{ + unsigned int ctrl; + int retval, *ret_data = NULL; + const char *name; + const void *p; + + D(("called.")); + + ctrl = _set_ctrl(pamh, flags, NULL, NULL, argc, argv); + + /* Get a few bytes so we can pass our return value to + pam_sm_setcred(). */ + if (on(UNIX_LIKE_AUTH, ctrl)) + ret_data = malloc(sizeof(int)); + + /* get the user'name' */ + + retval = pam_get_user(pamh, &name, NULL); + if (retval == PAM_SUCCESS) { + /* + * Various libraries at various times have had bugs related to + * '+' or '-' as the first character of a user name. Don't + * allow this characters here. + */ + if (name == NULL || name[0] == '-' || name[0] == '+') { + pam_syslog(pamh, LOG_ERR, "bad username [%s]", name); + retval = PAM_USER_UNKNOWN; + AUTH_RETURN; + } + if (retval == PAM_SUCCESS && on(UNIX_DEBUG, ctrl)) + D(("username [%s] obtained", name)); + } else { + D(("trouble reading username")); + if (retval == PAM_CONV_AGAIN) { + D(("pam_get_user/conv() function is not ready yet")); + /* it is safe to resume this function so we translate this + * retval to the value that indicates we're happy to resume. + */ + retval = PAM_INCOMPLETE; + } + AUTH_RETURN; + } + + /* if this user does not have a password... */ + + if (_unix_blankpasswd(pamh, ctrl, name)) { + D(("user '%s' has blank passwd", name)); + name = NULL; + retval = PAM_SUCCESS; + AUTH_RETURN; + } + /* get this user's authentication token */ + + retval = _unix_read_password(pamh, ctrl, NULL, _("Password: "), NULL + ,_UNIX_AUTHTOK, &p); + if (retval != PAM_SUCCESS) { + if (retval != PAM_CONV_AGAIN) { + pam_syslog(pamh, LOG_CRIT, + "auth could not identify password for [%s]", name); + } else { + D(("conversation function is not ready yet")); + /* + * it is safe to resume this function so we translate this + * retval to the value that indicates we're happy to resume. + */ + retval = PAM_INCOMPLETE; + } + name = NULL; + AUTH_RETURN; + } + D(("user=%s, password=[%s]", name, p)); + + /* verify the password of this user */ + retval = _unix_verify_password(pamh, name, p, ctrl); + name = p = NULL; + + AUTH_RETURN; +} + + +/* + * The only thing _pam_set_credentials_unix() does is initialization of + * UNIX group IDs. + * + * Well, everybody but me on linux-pam is convinced that it should not + * initialize group IDs, so I am not doing it but don't say that I haven't + * warned you. -- AOY + */ + +PAM_EXTERN int +pam_sm_setcred (pam_handle_t *pamh, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + int retval; + const void *pretval = NULL; + + D(("called.")); + + retval = PAM_SUCCESS; + + D(("recovering return code from auth call")); + /* We will only find something here if UNIX_LIKE_AUTH is set -- + don't worry about an explicit check of argv. */ + if (pam_get_data(pamh, "unix_setcred_return", &pretval) == PAM_SUCCESS + && pretval) { + retval = *(const int *)pretval; + pam_set_data(pamh, "unix_setcred_return", NULL, NULL); + D(("recovered data indicates that old retval was %d", retval)); + } + + return retval; +} + +#ifdef PAM_STATIC +struct pam_module _pam_unix_auth_modstruct = { + "pam_unix_auth", + pam_sm_authenticate, + pam_sm_setcred, + NULL, + NULL, + NULL, + NULL, +}; +#endif diff --git a/modules/pam_unix/pam_unix_passwd.c b/modules/pam_unix/pam_unix_passwd.c new file mode 100644 index 00000000..d221220f --- /dev/null +++ b/modules/pam_unix/pam_unix_passwd.c @@ -0,0 +1,790 @@ +/* + * Main coding by Elliot Lee <sopwith@redhat.com>, Red Hat Software. + * Copyright (C) 1996. + * Copyright (c) Jan Rêkorajski, 1999. + * Copyright (c) Red Hat, Inc., 2007, 2008. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, and the entire permission notice in its entirety, + * including the disclaimer of warranties. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * ALTERNATIVELY, this product may be distributed under the terms of + * the GNU Public License, in which case the provisions of the GPL are + * required INSTEAD OF the above restrictions. (This clause is + * necessary due to a potential bad interaction between the GPL and + * the restrictions contained in a BSD-style copyright.) + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include "config.h" + +#include <stdio.h> +#include <stdlib.h> +#include <stdarg.h> +#include <string.h> +#include <malloc.h> +#include <unistd.h> +#include <errno.h> +#include <sys/types.h> +#include <pwd.h> +#include <syslog.h> +#include <shadow.h> +#include <time.h> /* for time() */ +#include <fcntl.h> +#include <ctype.h> +#include <sys/time.h> +#include <sys/stat.h> +#include <rpc/rpc.h> +#include <rpcsvc/yp_prot.h> +#include <rpcsvc/ypclnt.h> + +#include <signal.h> +#include <errno.h> +#include <sys/wait.h> +#ifdef WITH_SELINUX +static int selinux_enabled=-1; +#include <selinux/selinux.h> +#define SELINUX_ENABLED (selinux_enabled!=-1 ? selinux_enabled : (selinux_enabled=is_selinux_enabled()>0)) +#endif + +#include <security/_pam_macros.h> + +/* indicate the following groups are defined */ + +#define PAM_SM_PASSWORD + +#include <security/pam_modules.h> +#include <security/pam_ext.h> +#include <security/pam_modutil.h> + +#include "yppasswd.h" +#include "md5.h" +#include "support.h" +#include "passverify.h" +#include "bigcrypt.h" + +#if !((__GLIBC__ == 2) && (__GLIBC_MINOR__ >= 1)) +extern int getrpcport(const char *host, unsigned long prognum, + unsigned long versnum, unsigned int proto); +#endif /* GNU libc 2.1 */ + +/* + How it works: + Gets in username (has to be done) from the calling program + Does authentication of user (only if we are not running as root) + Gets new password/checks for sanity + Sets it. + */ + +/* data tokens */ + +#define _UNIX_OLD_AUTHTOK "-UN*X-OLD-PASS" +#define _UNIX_NEW_AUTHTOK "-UN*X-NEW-PASS" + +#define MAX_PASSWD_TRIES 3 + +static char *getNISserver(pam_handle_t *pamh) +{ + char *master; + char *domainname; + int port, err; + + if ((err = yp_get_default_domain(&domainname)) != 0) { + pam_syslog(pamh, LOG_WARNING, "can't get local yp domain: %s", + yperr_string(err)); + return NULL; + } + if ((err = yp_master(domainname, "passwd.byname", &master)) != 0) { + pam_syslog(pamh, LOG_WARNING, "can't find the master ypserver: %s", + yperr_string(err)); + return NULL; + } + port = getrpcport(master, YPPASSWDPROG, YPPASSWDPROC_UPDATE, IPPROTO_UDP); + if (port == 0) { + pam_syslog(pamh, LOG_WARNING, + "yppasswdd not running on NIS master host"); + return NULL; + } + if (port >= IPPORT_RESERVED) { + pam_syslog(pamh, LOG_WARNING, + "yppasswd daemon running on illegal port"); + return NULL; + } + return master; +} + +#ifdef WITH_SELINUX + +static int _unix_run_update_binary(pam_handle_t *pamh, unsigned int ctrl, const char *user, + const char *fromwhat, const char *towhat, int remember) +{ + int retval, child, fds[2]; + void (*sighandler)(int) = NULL; + + D(("called.")); + /* create a pipe for the password */ + if (pipe(fds) != 0) { + D(("could not make pipe")); + return PAM_AUTH_ERR; + } + + if (off(UNIX_NOREAP, ctrl)) { + /* + * This code arranges that the demise of the child does not cause + * the application to receive a signal it is not expecting - which + * may kill the application or worse. + * + * The "noreap" module argument is provided so that the admin can + * override this behavior. + */ + sighandler = signal(SIGCHLD, SIG_DFL); + } + + /* fork */ + child = fork(); + if (child == 0) { + size_t i=0; + struct rlimit rlim; + static char *envp[] = { NULL }; + char *args[] = { NULL, NULL, NULL, NULL, NULL, NULL }; + char buffer[16]; + + /* XXX - should really tidy up PAM here too */ + + close(0); close(1); + /* reopen stdin as pipe */ + close(fds[1]); + dup2(fds[0], STDIN_FILENO); + + if (getrlimit(RLIMIT_NOFILE,&rlim)==0) { + for (i=2; i < rlim.rlim_max; i++) { + if ((unsigned int)fds[0] != i) + close(i); + } + } + + if (SELINUX_ENABLED && geteuid() == 0) { + /* must set the real uid to 0 so the helper will not error + out if pam is called from setuid binary (su, sudo...) */ + setuid(0); + } + + /* exec binary helper */ + args[0] = x_strdup(UPDATE_HELPER); + args[1] = x_strdup(user); + args[2] = x_strdup("update"); + if (on(UNIX_SHADOW, ctrl)) + args[3] = x_strdup("1"); + else + args[3] = x_strdup("0"); + + snprintf(buffer, sizeof(buffer), "%d", remember); + args[4] = x_strdup(buffer); + + execve(UPDATE_HELPER, args, envp); + + /* should not get here: exit with error */ + D(("helper binary is not available")); + exit(PAM_AUTHINFO_UNAVAIL); + } else if (child > 0) { + /* wait for child */ + /* if the stored password is NULL */ + int rc=0; + if (fromwhat) + pam_modutil_write(fds[1], fromwhat, strlen(fromwhat)+1); + else + pam_modutil_write(fds[1], "", 1); + if (towhat) { + pam_modutil_write(fds[1], towhat, strlen(towhat)+1); + } + else + pam_modutil_write(fds[1], "", 1); + + close(fds[0]); /* close here to avoid possible SIGPIPE above */ + close(fds[1]); + rc=waitpid(child, &retval, 0); /* wait for helper to complete */ + if (rc<0) { + pam_syslog(pamh, LOG_ERR, "unix_update waitpid failed: %m"); + retval = PAM_AUTH_ERR; + } else { + retval = WEXITSTATUS(retval); + } + } else { + D(("fork failed")); + close(fds[0]); + close(fds[1]); + retval = PAM_AUTH_ERR; + } + + if (sighandler != SIG_ERR) { + (void) signal(SIGCHLD, sighandler); /* restore old signal handler */ + } + + return retval; +} +#endif + +static int check_old_password(const char *forwho, const char *newpass) +{ + static char buf[16384]; + char *s_luser, *s_uid, *s_npas, *s_pas; + int retval = PAM_SUCCESS; + FILE *opwfile; + + opwfile = fopen(OLD_PASSWORDS_FILE, "r"); + if (opwfile == NULL) + return PAM_ABORT; + + while (fgets(buf, 16380, opwfile)) { + if (!strncmp(buf, forwho, strlen(forwho))) { + char *sptr; + buf[strlen(buf) - 1] = '\0'; + s_luser = strtok_r(buf, ":,", &sptr); + s_uid = strtok_r(NULL, ":,", &sptr); + s_npas = strtok_r(NULL, ":,", &sptr); + s_pas = strtok_r(NULL, ":,", &sptr); + while (s_pas != NULL) { + char *md5pass = Goodcrypt_md5(newpass, s_pas); + if (!strcmp(md5pass, s_pas)) { + _pam_delete(md5pass); + retval = PAM_AUTHTOK_ERR; + break; + } + s_pas = strtok_r(NULL, ":,", &sptr); + _pam_delete(md5pass); + } + break; + } + } + fclose(opwfile); + + return retval; +} + +static int _do_setpass(pam_handle_t* pamh, const char *forwho, + const char *fromwhat, + char *towhat, unsigned int ctrl, int remember) +{ + struct passwd *pwd = NULL; + int retval = 0; + int unlocked = 0; + char *master = NULL; + + D(("called")); + + pwd = getpwnam(forwho); + + if (pwd == NULL) { + retval = PAM_AUTHTOK_ERR; + goto done; + } + + if (on(UNIX_NIS, ctrl) && _unix_comesfromsource(pamh, forwho, 0, 1)) { + if ((master=getNISserver(pamh)) != NULL) { + struct timeval timeout; + struct yppasswd yppwd; + CLIENT *clnt; + int status; + enum clnt_stat err; + + /* Unlock passwd file to avoid deadlock */ + unlock_pwdf(); + unlocked = 1; + + /* Initialize password information */ + yppwd.newpw.pw_passwd = pwd->pw_passwd; + yppwd.newpw.pw_name = pwd->pw_name; + yppwd.newpw.pw_uid = pwd->pw_uid; + yppwd.newpw.pw_gid = pwd->pw_gid; + yppwd.newpw.pw_gecos = pwd->pw_gecos; + yppwd.newpw.pw_dir = pwd->pw_dir; + yppwd.newpw.pw_shell = pwd->pw_shell; + yppwd.oldpass = fromwhat ? strdup (fromwhat) : strdup (""); + yppwd.newpw.pw_passwd = towhat; + + D(("Set password %s for %s", yppwd.newpw.pw_passwd, forwho)); + + /* The yppasswd.x file said `unix authentication required', + * so I added it. This is the only reason it is in here. + * My yppasswdd doesn't use it, but maybe some others out there + * do. --okir + */ + clnt = clnt_create(master, YPPASSWDPROG, YPPASSWDVERS, "udp"); + clnt->cl_auth = authunix_create_default(); + memset((char *) &status, '\0', sizeof(status)); + timeout.tv_sec = 25; + timeout.tv_usec = 0; + err = clnt_call(clnt, YPPASSWDPROC_UPDATE, + (xdrproc_t) xdr_yppasswd, (char *) &yppwd, + (xdrproc_t) xdr_int, (char *) &status, + timeout); + + free (yppwd.oldpass); + + if (err) { + _make_remark(pamh, ctrl, PAM_TEXT_INFO, + clnt_sperrno(err)); + } else if (status) { + D(("Error while changing NIS password.\n")); + } + D(("The password has%s been changed on %s.", + (err || status) ? " not" : "", master)); + pam_syslog(pamh, LOG_NOTICE, "password%s changed for %s on %s", + (err || status) ? " not" : "", pwd->pw_name, master); + + auth_destroy(clnt->cl_auth); + clnt_destroy(clnt); + if (err || status) { + _make_remark(pamh, ctrl, PAM_TEXT_INFO, + _("NIS password could not be changed.")); + retval = PAM_TRY_AGAIN; + } +#ifdef DEBUG + sleep(5); +#endif + } else { + retval = PAM_TRY_AGAIN; + } + } + + if (_unix_comesfromsource(pamh, forwho, 1, 0)) { + if(unlocked) { + if (lock_pwdf() != PAM_SUCCESS) { + return PAM_AUTHTOK_LOCK_BUSY; + } + } +#ifdef WITH_SELINUX + if (unix_selinux_confined()) + return _unix_run_update_binary(pamh, ctrl, forwho, fromwhat, towhat, remember); +#endif + /* first, save old password */ + if (save_old_password(forwho, fromwhat, remember)) { + retval = PAM_AUTHTOK_ERR; + goto done; + } + if (on(UNIX_SHADOW, ctrl) || is_pwd_shadowed(pwd)) { + retval = unix_update_shadow(pamh, forwho, towhat); + if (retval == PAM_SUCCESS) + if (!is_pwd_shadowed(pwd)) + retval = unix_update_passwd(pamh, forwho, "x"); + } else { + retval = unix_update_passwd(pamh, forwho, towhat); + } + } + + +done: + unlock_pwdf(); + + return retval; +} + +static int _unix_verify_shadow(pam_handle_t *pamh, const char *user, unsigned int ctrl) +{ + struct passwd *pwent = NULL; /* Password and shadow password */ + struct spwd *spent = NULL; /* file entries for the user */ + int daysleft; + int retval; + + retval = get_account_info(pamh, user, &pwent, &spent); + if (retval == PAM_USER_UNKNOWN) { + return retval; + } + + if (retval == PAM_SUCCESS && spent == NULL) + return PAM_SUCCESS; + + if (retval == PAM_UNIX_RUN_HELPER) { + retval = _unix_run_verify_binary(pamh, ctrl, user, &daysleft); + if (retval == PAM_AUTH_ERR || retval == PAM_USER_UNKNOWN) + return retval; + } + else if (retval == PAM_SUCCESS) + retval = check_shadow_expiry(pamh, spent, &daysleft); + + if (on(UNIX__IAMROOT, ctrl) || retval == PAM_NEW_AUTHTOK_REQD) + return PAM_SUCCESS; + + return retval; +} + +static int _pam_unix_approve_pass(pam_handle_t * pamh + ,unsigned int ctrl + ,const char *pass_old + ,const char *pass_new) +{ + const void *user; + const char *remark = NULL; + int retval = PAM_SUCCESS; + + D(("&new=%p, &old=%p", pass_old, pass_new)); + D(("new=[%s]", pass_new)); + D(("old=[%s]", pass_old)); + + if (pass_new == NULL || (pass_old && !strcmp(pass_old, pass_new))) { + if (on(UNIX_DEBUG, ctrl)) { + pam_syslog(pamh, LOG_DEBUG, "bad authentication token"); + } + _make_remark(pamh, ctrl, PAM_ERROR_MSG, pass_new == NULL ? + _("No password supplied") : _("Password unchanged")); + return PAM_AUTHTOK_ERR; + } + /* + * if one wanted to hardwire authentication token strength + * checking this would be the place - AGM + */ + + retval = pam_get_item(pamh, PAM_USER, &user); + if (retval != PAM_SUCCESS) { + if (on(UNIX_DEBUG, ctrl)) { + pam_syslog(pamh, LOG_ERR, "Can not get username"); + return PAM_AUTHTOK_ERR; + } + } + if (off(UNIX__IAMROOT, ctrl)) { + if (strlen(pass_new) < 6) + remark = _("You must choose a longer password"); + D(("length check [%s]", remark)); + if (on(UNIX_REMEMBER_PASSWD, ctrl)) { + if ((retval = check_old_password(user, pass_new)) == PAM_AUTHTOK_ERR) + remark = _("Password has been already used. Choose another."); + if (retval == PAM_ABORT) { + pam_syslog(pamh, LOG_ERR, "can't open %s file to check old passwords", + OLD_PASSWORDS_FILE); + return retval; + } + } + } + if (remark) { + _make_remark(pamh, ctrl, PAM_ERROR_MSG, remark); + retval = PAM_AUTHTOK_ERR; + } + return retval; +} + + +PAM_EXTERN int pam_sm_chauthtok(pam_handle_t * pamh, int flags, + int argc, const char **argv) +{ + unsigned int ctrl, lctrl; + int retval; + int remember = -1; + int rounds = -1; + + /* <DO NOT free() THESE> */ + const char *user; + const void *pass_old, *pass_new; + /* </DO NOT free() THESE> */ + + D(("called.")); + + ctrl = _set_ctrl(pamh, flags, &remember, &rounds, argc, argv); + + /* + * First get the name of a user + */ + retval = pam_get_user(pamh, &user, NULL); + if (retval == PAM_SUCCESS) { + /* + * Various libraries at various times have had bugs related to + * '+' or '-' as the first character of a user name. Don't + * allow them. + */ + if (user == NULL || user[0] == '-' || user[0] == '+') { + pam_syslog(pamh, LOG_ERR, "bad username [%s]", user); + return PAM_USER_UNKNOWN; + } + if (retval == PAM_SUCCESS && on(UNIX_DEBUG, ctrl)) + pam_syslog(pamh, LOG_DEBUG, "username [%s] obtained", + user); + } else { + if (on(UNIX_DEBUG, ctrl)) + pam_syslog(pamh, LOG_DEBUG, + "password - could not identify user"); + return retval; + } + + D(("Got username of %s", user)); + + /* + * Before we do anything else, check to make sure that the user's + * info is in one of the databases we can modify from this module, + * which currently is 'files' and 'nis'. We have to do this because + * getpwnam() doesn't tell you *where* the information it gives you + * came from, nor should it. That's our job. + */ + if (_unix_comesfromsource(pamh, user, 1, on(UNIX_NIS, ctrl)) == 0) { + pam_syslog(pamh, LOG_DEBUG, + "user \"%s\" does not exist in /etc/passwd%s", + user, on(UNIX_NIS, ctrl) ? " or NIS" : ""); + return PAM_USER_UNKNOWN; + } else { + struct passwd *pwd; + _unix_getpwnam(pamh, user, 1, 1, &pwd); + if (pwd == NULL) { + pam_syslog(pamh, LOG_DEBUG, + "user \"%s\" has corrupted passwd entry", + user); + return PAM_USER_UNKNOWN; + } + } + + /* + * This is not an AUTH module! + */ + if (on(UNIX__NONULL, ctrl)) + set(UNIX__NULLOK, ctrl); + + if (on(UNIX__PRELIM, ctrl)) { + /* + * obtain and verify the current password (OLDAUTHTOK) for + * the user. + */ + char *Announce; + + D(("prelim check")); + + if (_unix_blankpasswd(pamh, ctrl, user)) { + return PAM_SUCCESS; + } else if (off(UNIX__IAMROOT, ctrl)) { + /* instruct user what is happening */ + if (asprintf(&Announce, _("Changing password for %s."), + user) < 0) { + pam_syslog(pamh, LOG_CRIT, + "password - out of memory"); + return PAM_BUF_ERR; + } + + lctrl = ctrl; + set(UNIX__OLD_PASSWD, lctrl); + retval = _unix_read_password(pamh, lctrl + ,Announce + ,_("(current) UNIX password: ") + ,NULL + ,_UNIX_OLD_AUTHTOK + ,&pass_old); + free(Announce); + + if (retval != PAM_SUCCESS) { + pam_syslog(pamh, LOG_NOTICE, + "password - (old) token not obtained"); + return retval; + } + /* verify that this is the password for this user */ + + retval = _unix_verify_password(pamh, user, pass_old, ctrl); + } else { + D(("process run by root so do nothing this time around")); + pass_old = NULL; + retval = PAM_SUCCESS; /* root doesn't have too */ + } + + if (retval != PAM_SUCCESS) { + D(("Authentication failed")); + pass_old = NULL; + return retval; + } + retval = pam_set_item(pamh, PAM_OLDAUTHTOK, (const void *) pass_old); + pass_old = NULL; + if (retval != PAM_SUCCESS) { + pam_syslog(pamh, LOG_CRIT, + "failed to set PAM_OLDAUTHTOK"); + } + retval = _unix_verify_shadow(pamh,user, ctrl); + if (retval == PAM_AUTHTOK_ERR) { + if (off(UNIX__IAMROOT, ctrl)) + _make_remark(pamh, ctrl, PAM_ERROR_MSG, + _("You must wait longer to change your password")); + else + retval = PAM_SUCCESS; + } + } else if (on(UNIX__UPDATE, ctrl)) { + /* + * tpass is used below to store the _pam_md() return; it + * should be _pam_delete()'d. + */ + + char *tpass = NULL; + int retry = 0; + + /* + * obtain the proposed password + */ + + D(("do update")); + + /* + * get the old token back. NULL was ok only if root [at this + * point we assume that this has already been enforced on a + * previous call to this function]. + */ + + if (off(UNIX_NOT_SET_PASS, ctrl)) { + retval = pam_get_item(pamh, PAM_OLDAUTHTOK + ,&pass_old); + } else { + retval = pam_get_data(pamh, _UNIX_OLD_AUTHTOK + ,&pass_old); + if (retval == PAM_NO_MODULE_DATA) { + retval = PAM_SUCCESS; + pass_old = NULL; + } + } + D(("pass_old [%s]", pass_old)); + + if (retval != PAM_SUCCESS) { + pam_syslog(pamh, LOG_NOTICE, "user not authenticated"); + return retval; + } + + D(("get new password now")); + + lctrl = ctrl; + + if (on(UNIX_USE_AUTHTOK, lctrl)) { + set(UNIX_USE_FIRST_PASS, lctrl); + } + retry = 0; + retval = PAM_AUTHTOK_ERR; + while ((retval != PAM_SUCCESS) && (retry++ < MAX_PASSWD_TRIES)) { + /* + * use_authtok is to force the use of a previously entered + * password -- needed for pluggable password strength checking + */ + + retval = _unix_read_password(pamh, lctrl + ,NULL + ,_("Enter new UNIX password: ") + ,_("Retype new UNIX password: ") + ,_UNIX_NEW_AUTHTOK + ,&pass_new); + + if (retval != PAM_SUCCESS) { + if (on(UNIX_DEBUG, ctrl)) { + pam_syslog(pamh, LOG_ALERT, + "password - new password not obtained"); + } + pass_old = NULL; /* tidy up */ + return retval; + } + D(("returned to _unix_chauthtok")); + + /* + * At this point we know who the user is and what they + * propose as their new password. Verify that the new + * password is acceptable. + */ + + if (*(const char *)pass_new == '\0') { /* "\0" password = NULL */ + pass_new = NULL; + } + retval = _pam_unix_approve_pass(pamh, ctrl, pass_old, pass_new); + } + + if (retval != PAM_SUCCESS) { + pam_syslog(pamh, LOG_NOTICE, + "new password not acceptable"); + pass_new = pass_old = NULL; /* tidy up */ + return retval; + } + if (lock_pwdf() != PAM_SUCCESS) { + return PAM_AUTHTOK_LOCK_BUSY; + } + + if (pass_old) { + retval = _unix_verify_password(pamh, user, pass_old, ctrl); + if (retval != PAM_SUCCESS) { + pam_syslog(pamh, LOG_NOTICE, "user password changed by another process"); + unlock_pwdf(); + return retval; + } + } + + retval = _unix_verify_shadow(pamh, user, ctrl); + if (retval != PAM_SUCCESS) { + pam_syslog(pamh, LOG_NOTICE, "user shadow entry expired"); + unlock_pwdf(); + return retval; + } + + retval = _pam_unix_approve_pass(pamh, ctrl, pass_old, pass_new); + if (retval != PAM_SUCCESS) { + pam_syslog(pamh, LOG_NOTICE, + "new password not acceptable 2"); + pass_new = pass_old = NULL; /* tidy up */ + unlock_pwdf(); + return retval; + } + + /* + * By reaching here we have approved the passwords and must now + * rebuild the password database file. + */ + + /* + * First we encrypt the new password. + */ + + tpass = create_password_hash(pass_new, ctrl, rounds); + if (tpass == NULL) { + pam_syslog(pamh, LOG_CRIT, + "out of memory for password"); + pass_new = pass_old = NULL; /* tidy up */ + unlock_pwdf(); + return PAM_BUF_ERR; + } + + D(("password processed")); + + /* update the password database(s) -- race conditions..? */ + + retval = _do_setpass(pamh, user, pass_old, tpass, ctrl, + remember); + /* _do_setpass has called unlock_pwdf for us */ + + _pam_delete(tpass); + pass_old = pass_new = NULL; + } else { /* something has broken with the module */ + pam_syslog(pamh, LOG_ALERT, + "password received unknown request"); + retval = PAM_ABORT; + } + + D(("retval was %d", retval)); + + return retval; +} + + +/* static module data */ +#ifdef PAM_STATIC +struct pam_module _pam_unix_passwd_modstruct = { + "pam_unix_passwd", + NULL, + NULL, + NULL, + NULL, + NULL, + pam_sm_chauthtok, +}; +#endif diff --git a/modules/pam_unix/pam_unix_sess.c b/modules/pam_unix/pam_unix_sess.c new file mode 100644 index 00000000..3379df42 --- /dev/null +++ b/modules/pam_unix/pam_unix_sess.c @@ -0,0 +1,143 @@ +/* + * $Id: pam_unix_sess.c,v 1.10 2008/01/23 15:35:13 t8m Exp $ + * + * Copyright Alexander O. Yuriev, 1996. All rights reserved. + * Copyright Jan Rêkorajski, 1999. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, and the entire permission notice in its entirety, + * including the disclaimer of warranties. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * ALTERNATIVELY, this product may be distributed under the terms of + * the GNU Public License, in which case the provisions of the GPL are + * required INSTEAD OF the above restrictions. (This clause is + * necessary due to a potential bad interaction between the GPL and + * the restrictions contained in a BSD-style copyright.) + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include "config.h" + +#include <stdio.h> +#include <stdlib.h> +#include <stdarg.h> +#include <unistd.h> +#include <syslog.h> +#include <fcntl.h> +#include <sys/types.h> +#include <sys/stat.h> + +/* indicate the following groups are defined */ + +#define PAM_SM_SESSION + +#include <security/_pam_macros.h> +#include <security/pam_modules.h> +#include <security/pam_ext.h> +#include <security/pam_modutil.h> + +#include "support.h" + +/* + * PAM framework looks for these entry-points to pass control to the + * session module. + */ + +PAM_EXTERN int pam_sm_open_session(pam_handle_t * pamh, int flags, + int argc, const char **argv) +{ + char *user_name, *service; + unsigned int ctrl; + int retval; + const char *login_name; + + D(("called.")); + + ctrl = _set_ctrl(pamh, flags, NULL, NULL, argc, argv); + + retval = pam_get_item(pamh, PAM_USER, (void *) &user_name); + if (user_name == NULL || *user_name == '\0' || retval != PAM_SUCCESS) { + pam_syslog(pamh, LOG_CRIT, + "open_session - error recovering username"); + return PAM_SESSION_ERR; /* How did we get authenticated with + no username?! */ + } + retval = pam_get_item(pamh, PAM_SERVICE, (void *) &service); + if (service == NULL || *service == '\0' || retval != PAM_SUCCESS) { + pam_syslog(pamh, LOG_CRIT, + "open_session - error recovering service"); + return PAM_SESSION_ERR; + } + login_name = pam_modutil_getlogin(pamh); + if (login_name == NULL) { + login_name = ""; + } + pam_syslog(pamh, LOG_INFO, "session opened for user %s by %s(uid=%lu)", + user_name, login_name, (unsigned long)getuid()); + + return PAM_SUCCESS; +} + +PAM_EXTERN int pam_sm_close_session(pam_handle_t * pamh, int flags, + int argc, const char **argv) +{ + char *user_name, *service; + unsigned int ctrl; + int retval; + + D(("called.")); + + ctrl = _set_ctrl(pamh, flags, NULL, NULL, argc, argv); + + retval = pam_get_item(pamh, PAM_USER, (void *) &user_name); + if (user_name == NULL || *user_name == '\0' || retval != PAM_SUCCESS) { + pam_syslog(pamh, LOG_CRIT, + "close_session - error recovering username"); + return PAM_SESSION_ERR; /* How did we get authenticated with + no username?! */ + } + retval = pam_get_item(pamh, PAM_SERVICE, (void *) &service); + if (service == NULL || *service == '\0' || retval != PAM_SUCCESS) { + pam_syslog(pamh, LOG_CRIT, + "close_session - error recovering service"); + return PAM_SESSION_ERR; + } + pam_syslog(pamh, LOG_INFO, "session closed for user %s", + user_name); + + return PAM_SUCCESS; +} + +/* static module data */ +#ifdef PAM_STATIC +struct pam_module _pam_unix_session_modstruct = { + "pam_unix_session", + NULL, + NULL, + NULL, + pam_sm_open_session, + pam_sm_close_session, + NULL, +}; +#endif + diff --git a/modules/pam_unix/passverify.c b/modules/pam_unix/passverify.c new file mode 100644 index 00000000..6d588e63 --- /dev/null +++ b/modules/pam_unix/passverify.c @@ -0,0 +1,1129 @@ +/* + * Copyright information at end of file. + */ +#include "config.h" +#include <security/_pam_macros.h> +#include <security/pam_modules.h> +#include "support.h" +#include <stdio.h> +#include <string.h> +#include <sys/types.h> +#include <unistd.h> +#include <pwd.h> +#include <shadow.h> +#include <syslog.h> +#include <stdarg.h> +#include <signal.h> +#include <errno.h> +#include <time.h> +#include <sys/time.h> +#include <sys/stat.h> +#include <fcntl.h> +#ifdef HAVE_CRYPT_H +#include <crypt.h> +#endif + +#include "md5.h" +#include "bigcrypt.h" +#include "passverify.h" + +#ifdef WITH_SELINUX +#include <selinux/selinux.h> +#define SELINUX_ENABLED is_selinux_enabled()>0 +#else +#define SELINUX_ENABLED 0 +#endif + +#ifdef HELPER_COMPILE +#define pam_modutil_getpwnam(h,n) getpwnam(n) +#define pam_modutil_getspnam(h,n) getspnam(n) +#define pam_syslog(h,a,b,c) helper_log_err(a,b,c) +#else +#include <security/pam_modutil.h> +#include <security/pam_ext.h> +#endif + +#if defined(USE_LCKPWDF) && !defined(HAVE_LCKPWDF) +# include "./lckpwdf.-c" +#endif + +static void +strip_hpux_aging(char *hash) +{ + static const char valid[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" + "abcdefghijklmnopqrstuvwxyz" + "0123456789./"; + if ((*hash != '$') && (strlen(hash) > 13)) { + for (hash += 13; *hash != '\0'; hash++) { + if (strchr(valid, *hash) == NULL) { + *hash = '\0'; + break; + } + } + } +} + +int +verify_pwd_hash(const char *p, char *hash, unsigned int nullok) +{ + size_t hash_len; + char *pp = NULL; + int retval; + D(("called")); + + strip_hpux_aging(hash); + hash_len = strlen(hash); + if (!hash_len) { + /* the stored password is NULL */ + if (nullok) { /* this means we've succeeded */ + D(("user has empty password - access granted")); + retval = PAM_SUCCESS; + } else { + D(("user has empty password - access denied")); + retval = PAM_AUTH_ERR; + } + } else if (!p || *hash == '*' || *hash == '!') { + retval = PAM_AUTH_ERR; + } else { + if (!strncmp(hash, "$1$", 3)) { + pp = Goodcrypt_md5(p, hash); + if (pp && strcmp(pp, hash) != 0) { + _pam_delete(pp); + pp = Brokencrypt_md5(p, hash); + } + } else if (*hash != '$' && hash_len >= 13) { + pp = bigcrypt(p, hash); + if (pp && hash_len == 13 && strlen(pp) > hash_len) { + _pam_overwrite(pp + hash_len); + } + } else { + /* + * Ok, we don't know the crypt algorithm, but maybe + * libcrypt knows about it? We should try it. + */ +#ifdef HAVE_CRYPT_R + struct crypt_data *cdata; + cdata = malloc(sizeof(*cdata)); + if (cdata != NULL) { + cdata->initialized = 0; + pp = x_strdup(crypt_r(p, hash, cdata)); + memset(cdata, '\0', sizeof(*cdata)); + free(cdata); + } +#else + pp = x_strdup(crypt(p, hash)); +#endif + } + p = NULL; /* no longer needed here */ + + /* the moment of truth -- do we agree with the password? */ + D(("comparing state of pp[%s] and salt[%s]", pp, salt)); + + if (pp && strcmp(pp, hash) == 0) { + retval = PAM_SUCCESS; + } else { + retval = PAM_AUTH_ERR; + } + } + + if (pp) + _pam_delete(pp); + D(("done [%d].", retval)); + + return retval; +} + +int +is_pwd_shadowed(const struct passwd *pwd) +{ + if (pwd != NULL) { + if (strcmp(pwd->pw_passwd, "x") == 0) { + return 1; + } + if ((pwd->pw_passwd[0] == '#') && + (pwd->pw_passwd[1] == '#') && + (strcmp(pwd->pw_name, pwd->pw_passwd + 2) == 0)) { + return 1; + } + } + return 0; +} + +#ifdef HELPER_COMPILE +int +get_account_info(const char *name, + struct passwd **pwd, struct spwd **spwdent) +#else +int +get_account_info(pam_handle_t *pamh, const char *name, + struct passwd **pwd, struct spwd **spwdent) +#endif +{ + /* UNIX passwords area */ + *pwd = pam_modutil_getpwnam(pamh, name); /* Get password file entry... */ + *spwdent = NULL; + + if (*pwd != NULL) { + if (strcmp((*pwd)->pw_passwd, "*NP*") == 0) + { /* NIS+ */ +#ifdef HELPER_COMPILE + uid_t save_euid, save_uid; + + save_euid = geteuid(); + save_uid = getuid(); + if (save_uid == (*pwd)->pw_uid) + setreuid(save_euid, save_uid); + else { + setreuid(0, -1); + if (setreuid(-1, (*pwd)->pw_uid) == -1) { + setreuid(-1, 0); + setreuid(0, -1); + if(setreuid(-1, (*pwd)->pw_uid) == -1) + return PAM_CRED_INSUFFICIENT; + } + } + + *spwdent = pam_modutil_getspnam(pamh, name); + if (save_uid == (*pwd)->pw_uid) + setreuid(save_uid, save_euid); + else { + setreuid(-1, 0); + setreuid(save_uid, -1); + setreuid(-1, save_euid); + } + + if (*spwdent == NULL || (*spwdent)->sp_pwdp == NULL) + return PAM_AUTHINFO_UNAVAIL; +#else + /* we must run helper for NIS+ passwords */ + return PAM_UNIX_RUN_HELPER; +#endif + } else if (is_pwd_shadowed(*pwd)) { + /* + * ...and shadow password file entry for this user, + * if shadowing is enabled + */ +#ifndef HELPER_COMPILE + if (geteuid() || SELINUX_ENABLED) + return PAM_UNIX_RUN_HELPER; +#endif + *spwdent = pam_modutil_getspnam(pamh, name); + if (*spwdent == NULL || (*spwdent)->sp_pwdp == NULL) + return PAM_AUTHINFO_UNAVAIL; + } + } else { + return PAM_USER_UNKNOWN; + } + return PAM_SUCCESS; +} + +#ifdef HELPER_COMPILE +int +get_pwd_hash(const char *name, + struct passwd **pwd, char **hash) +#else +int +get_pwd_hash(pam_handle_t *pamh, const char *name, + struct passwd **pwd, char **hash) +#endif +{ + int retval; + struct spwd *spwdent = NULL; + +#ifdef HELPER_COMPILE + retval = get_account_info(name, pwd, &spwdent); +#else + retval = get_account_info(pamh, name, pwd, &spwdent); +#endif + if (retval != PAM_SUCCESS) { + return retval; + } + + if (spwdent) + *hash = x_strdup(spwdent->sp_pwdp); + else + *hash = x_strdup((*pwd)->pw_passwd); + if (*hash == NULL) + return PAM_BUF_ERR; + + return PAM_SUCCESS; +} + +#ifdef HELPER_COMPILE +int +check_shadow_expiry(struct spwd *spent, int *daysleft) +#else +int +check_shadow_expiry(pam_handle_t *pamh, struct spwd *spent, int *daysleft) +#endif +{ + long int curdays; + *daysleft = -1; + curdays = (long int)(time(NULL) / (60 * 60 * 24)); + D(("today is %d, last change %d", curdays, spent->sp_lstchg)); + if ((curdays > spent->sp_expire) && (spent->sp_expire != -1)) { + D(("account expired")); + return PAM_ACCT_EXPIRED; + } + if (spent->sp_lstchg == 0) { + D(("need a new password")); + *daysleft = 0; + return PAM_NEW_AUTHTOK_REQD; + } + if (curdays < spent->sp_lstchg) { + pam_syslog(pamh, LOG_DEBUG, + "account %s has password changed in future", + spent->sp_namp); + return PAM_SUCCESS; + } + if ((curdays - spent->sp_lstchg > spent->sp_max) + && (curdays - spent->sp_lstchg > spent->sp_inact) + && (curdays - spent->sp_lstchg > spent->sp_max + spent->sp_inact) + && (spent->sp_max != -1) && (spent->sp_inact != -1)) { + *daysleft = (int)((spent->sp_lstchg + spent->sp_max) - curdays); + D(("authtok expired")); + return PAM_AUTHTOK_EXPIRED; + } + if ((curdays - spent->sp_lstchg > spent->sp_max) && (spent->sp_max != -1)) { + D(("need a new password 2")); + return PAM_NEW_AUTHTOK_REQD; + } + if ((curdays - spent->sp_lstchg > spent->sp_max - spent->sp_warn) + && (spent->sp_max != -1) && (spent->sp_warn != -1)) { + *daysleft = (int)((spent->sp_lstchg + spent->sp_max) - curdays); + D(("warn before expiry")); + } + return PAM_SUCCESS; + +} + +/* passwd/salt conversion macros */ + +#define PW_TMPFILE "/etc/npasswd" +#define SH_TMPFILE "/etc/nshadow" +#define OPW_TMPFILE "/etc/security/nopasswd" + +/* + * i64c - convert an integer to a radix 64 character + */ +static int +i64c(int i) +{ + if (i < 0) + return ('.'); + else if (i > 63) + return ('z'); + if (i == 0) + return ('.'); + if (i == 1) + return ('/'); + if (i >= 2 && i <= 11) + return ('0' - 2 + i); + if (i >= 12 && i <= 37) + return ('A' - 12 + i); + if (i >= 38 && i <= 63) + return ('a' - 38 + i); + return ('\0'); +} + +/* <where> must point to a buffer of at least <length>+1 length */ +static void +crypt_make_salt(char *where, int length) +{ + struct timeval tv; + MD5_CTX ctx; + unsigned char tmp[16]; + unsigned char *src = (unsigned char *)where; + int i; +#ifdef PAM_PATH_RANDOMDEV + int fd; + int rv; + + if ((rv = fd = open(PAM_PATH_RANDOMDEV, O_RDONLY)) != -1) { + while ((rv = read(fd, where, length)) != length && errno == EINTR); + close (fd); + } + if (rv != length) { +#endif + /* + * Code lifted from Marek Michalkiewicz's shadow suite. (CG) + * removed use of static variables (AGM) + * + * will work correctly only for length <= 16 */ + src = tmp; + GoodMD5Init(&ctx); + gettimeofday(&tv, (struct timezone *) 0); + GoodMD5Update(&ctx, (void *) &tv, sizeof tv); + i = getpid(); + GoodMD5Update(&ctx, (void *) &i, sizeof i); + i = clock(); + GoodMD5Update(&ctx, (void *) &i, sizeof i); + GoodMD5Update(&ctx, src, length); + GoodMD5Final(tmp, &ctx); +#ifdef PAM_PATH_RANDOMDEV + } +#endif + for (i = 0; i < length; i++) + *where++ = i64c(src[i] & 077); + *where = '\0'; +} + +char * +crypt_md5_wrapper(const char *pass_new) +{ + unsigned char result[16]; + char *cp = (char *) result; + + cp = stpcpy(cp, "$1$"); /* magic for the MD5 */ + crypt_make_salt(cp, 8); + + /* no longer need cleartext */ + cp = Goodcrypt_md5(pass_new, (const char *) result); + pass_new = NULL; + + return cp; +} + +char * +create_password_hash(const char *password, unsigned int ctrl, int rounds) +{ + const char *algoid; + char salt[64]; /* contains rounds number + max 16 bytes of salt + algo id */ + char *sp; + + if (on(UNIX_MD5_PASS, ctrl)) { + return crypt_md5_wrapper(password); + } + if (on(UNIX_SHA256_PASS, ctrl)) { + algoid = "$5$"; + } else if (on(UNIX_SHA512_PASS, ctrl)) { + algoid = "$6$"; + } else { /* must be crypt/bigcrypt */ + char tmppass[9]; + char *crypted; + + crypt_make_salt(salt, 2); + if (off(UNIX_BIGCRYPT, ctrl) && strlen(password) > 8) { + strncpy(tmppass, password, sizeof(tmppass)-1); + tmppass[sizeof(tmppass)-1] = '\0'; + password = tmppass; + } + crypted = bigcrypt(password, salt); + memset(tmppass, '\0', sizeof(tmppass)); + password = NULL; + return crypted; + } + + sp = stpcpy(salt, algoid); + if (on(UNIX_ALGO_ROUNDS, ctrl)) { + sp += snprintf(sp, sizeof(salt) - 3, "rounds=%u$", rounds); + } + crypt_make_salt(sp, 8); + /* For now be conservative so the resulting hashes + * are not too long. 8 bytes of salt prevents dictionary + * attacks well enough. */ + sp = crypt(password, salt); + if (strncmp(algoid, sp, strlen(algoid)) != 0) { + /* libc doesn't know the algorithm, use MD5 */ + memset(sp, '\0', strlen(sp)); + return crypt_md5_wrapper(password); + } + + return x_strdup(sp); +} + +#ifdef WITH_SELINUX +int +unix_selinux_confined(void) +{ + static int confined = -1; + int fd; + char tempfile[]="/etc/.pwdXXXXXX"; + + if (confined != -1) + return confined; + + /* cannot be confined without SELinux enabled */ + if (!SELINUX_ENABLED){ + confined = 0; + return confined; + } + + /* let's try opening shadow read only */ + if ((fd=open("/etc/shadow", O_RDONLY)) != -1) { + close(fd); + confined = 0; + return confined; + } + + if (errno == EACCES) { + confined = 1; + return confined; + } + + /* shadow opening failed because of other reasons let's try + creating a file in /etc */ + if ((fd=mkstemp(tempfile)) != -1) { + unlink(tempfile); + close(fd); + confined = 0; + return confined; + } + + confined = 1; + return confined; +} + +#else +int +unix_selinux_confined(void) +{ + return 0; +} +#endif + +#ifdef USE_LCKPWDF +int +lock_pwdf(void) +{ + int i; + int retval; + +#ifndef HELPER_COMPILE + if (unix_selinux_confined()) { + return PAM_SUCCESS; + } +#endif + /* These values for the number of attempts and the sleep time + are, of course, completely arbitrary. + My reading of the PAM docs is that, once pam_chauthtok() has been + called with PAM_UPDATE_AUTHTOK, we are obliged to take any + reasonable steps to make sure the token is updated; so retrying + for 1/10 sec. isn't overdoing it. */ + i=0; + while((retval = lckpwdf()) != 0 && i < 100) { + usleep(1000); + i++; + } + if(retval != 0) { + return PAM_AUTHTOK_LOCK_BUSY; + } + return PAM_SUCCESS; +} + +void +unlock_pwdf(void) +{ +#ifndef HELPER_COMPILE + if (unix_selinux_confined()) { + return; + } +#endif + ulckpwdf(); +} +#else +int +lock_pwdf(void) +{ + return PAM_SUCCESS; +} + +void +unlock_pwdf(void) +{ + return; +} +#endif + +int +save_old_password(const char *forwho, const char *oldpass, + int howmany) +{ + static char buf[16384]; + static char nbuf[16384]; + char *s_luser, *s_uid, *s_npas, *s_pas, *pass; + int npas; + FILE *pwfile, *opwfile; + int err = 0; + int oldmask; + int found = 0; + struct passwd *pwd = NULL; + struct stat st; +#ifdef WITH_SELINUX + security_context_t prev_context=NULL; +#endif + + if (howmany < 0) { + return PAM_SUCCESS; + } + + if (oldpass == NULL) { + return PAM_SUCCESS; + } + + oldmask = umask(077); + +#ifdef WITH_SELINUX + if (SELINUX_ENABLED) { + security_context_t passwd_context=NULL; + if (getfilecon("/etc/passwd",&passwd_context)<0) { + return PAM_AUTHTOK_ERR; + }; + if (getfscreatecon(&prev_context)<0) { + freecon(passwd_context); + return PAM_AUTHTOK_ERR; + } + if (setfscreatecon(passwd_context)) { + freecon(passwd_context); + freecon(prev_context); + return PAM_AUTHTOK_ERR; + } + freecon(passwd_context); + } +#endif + pwfile = fopen(OPW_TMPFILE, "w"); + umask(oldmask); + if (pwfile == NULL) { + err = 1; + goto done; + } + + opwfile = fopen(OLD_PASSWORDS_FILE, "r"); + if (opwfile == NULL) { + fclose(pwfile); + err = 1; + goto done; + } + + if (fstat(fileno(opwfile), &st) == -1) { + fclose(opwfile); + fclose(pwfile); + err = 1; + goto done; + } + + if (fchown(fileno(pwfile), st.st_uid, st.st_gid) == -1) { + fclose(opwfile); + fclose(pwfile); + err = 1; + goto done; + } + if (fchmod(fileno(pwfile), st.st_mode) == -1) { + fclose(opwfile); + fclose(pwfile); + err = 1; + goto done; + } + + while (fgets(buf, 16380, opwfile)) { + if (!strncmp(buf, forwho, strlen(forwho))) { + char *sptr = NULL; + found = 1; + if (howmany == 0) + continue; + buf[strlen(buf) - 1] = '\0'; + s_luser = strtok_r(buf, ":", &sptr); + s_uid = strtok_r(NULL, ":", &sptr); + s_npas = strtok_r(NULL, ":", &sptr); + s_pas = strtok_r(NULL, ":", &sptr); + npas = strtol(s_npas, NULL, 10) + 1; + while (npas > howmany) { + s_pas = strpbrk(s_pas, ","); + if (s_pas != NULL) + s_pas++; + npas--; + } + pass = crypt_md5_wrapper(oldpass); + if (s_pas == NULL) + snprintf(nbuf, sizeof(nbuf), "%s:%s:%d:%s\n", + s_luser, s_uid, npas, pass); + else + snprintf(nbuf, sizeof(nbuf),"%s:%s:%d:%s,%s\n", + s_luser, s_uid, npas, s_pas, pass); + _pam_delete(pass); + if (fputs(nbuf, pwfile) < 0) { + err = 1; + break; + } + } else if (fputs(buf, pwfile) < 0) { + err = 1; + break; + } + } + fclose(opwfile); + + if (!found) { + pwd = getpwnam(forwho); + if (pwd == NULL) { + err = 1; + } else { + pass = crypt_md5_wrapper(oldpass); + snprintf(nbuf, sizeof(nbuf), "%s:%lu:1:%s\n", + forwho, (unsigned long)pwd->pw_uid, pass); + _pam_delete(pass); + if (fputs(nbuf, pwfile) < 0) { + err = 1; + } + } + } + + if (fclose(pwfile)) { + D(("error writing entries to old passwords file: %m")); + err = 1; + } + +done: + if (!err) { + if (rename(OPW_TMPFILE, OLD_PASSWORDS_FILE)) + err = 1; + } +#ifdef WITH_SELINUX + if (SELINUX_ENABLED) { + if (setfscreatecon(prev_context)) { + err = 1; + } + if (prev_context) + freecon(prev_context); + prev_context=NULL; + } +#endif + if (!err) { + return PAM_SUCCESS; + } else { + unlink(OPW_TMPFILE); + return PAM_AUTHTOK_ERR; + } +} + +#ifdef HELPER_COMPILE +int +unix_update_passwd(const char *forwho, const char *towhat) +#else +int +unix_update_passwd(pam_handle_t *pamh, const char *forwho, const char *towhat) +#endif +{ + struct passwd *tmpent = NULL; + struct stat st; + FILE *pwfile, *opwfile; + int err = 1; + int oldmask; +#ifdef WITH_SELINUX + security_context_t prev_context=NULL; +#endif + + oldmask = umask(077); +#ifdef WITH_SELINUX + if (SELINUX_ENABLED) { + security_context_t passwd_context=NULL; + if (getfilecon("/etc/passwd",&passwd_context)<0) { + return PAM_AUTHTOK_ERR; + }; + if (getfscreatecon(&prev_context)<0) { + freecon(passwd_context); + return PAM_AUTHTOK_ERR; + } + if (setfscreatecon(passwd_context)) { + freecon(passwd_context); + freecon(prev_context); + return PAM_AUTHTOK_ERR; + } + freecon(passwd_context); + } +#endif + pwfile = fopen(PW_TMPFILE, "w"); + umask(oldmask); + if (pwfile == NULL) { + err = 1; + goto done; + } + + opwfile = fopen("/etc/passwd", "r"); + if (opwfile == NULL) { + fclose(pwfile); + err = 1; + goto done; + } + + if (fstat(fileno(opwfile), &st) == -1) { + fclose(opwfile); + fclose(pwfile); + err = 1; + goto done; + } + + if (fchown(fileno(pwfile), st.st_uid, st.st_gid) == -1) { + fclose(opwfile); + fclose(pwfile); + err = 1; + goto done; + } + if (fchmod(fileno(pwfile), st.st_mode) == -1) { + fclose(opwfile); + fclose(pwfile); + err = 1; + goto done; + } + + tmpent = fgetpwent(opwfile); + while (tmpent) { + if (!strcmp(tmpent->pw_name, forwho)) { + /* To shut gcc up */ + union { + const char *const_charp; + char *charp; + } assigned_passwd; + assigned_passwd.const_charp = towhat; + + tmpent->pw_passwd = assigned_passwd.charp; + err = 0; + } + if (putpwent(tmpent, pwfile)) { + D(("error writing entry to password file: %m")); + err = 1; + break; + } + tmpent = fgetpwent(opwfile); + } + fclose(opwfile); + + if (fclose(pwfile)) { + D(("error writing entries to password file: %m")); + err = 1; + } + +done: + if (!err) { + if (!rename(PW_TMPFILE, "/etc/passwd")) +#ifdef HELPER_COMPILE + helper_log_err( +#else + pam_syslog(pamh, +#endif + LOG_NOTICE, "password changed for %s", forwho); + else + err = 1; + } +#ifdef WITH_SELINUX + if (SELINUX_ENABLED) { + if (setfscreatecon(prev_context)) { + err = 1; + } + if (prev_context) + freecon(prev_context); + prev_context=NULL; + } +#endif + if (!err) { + return PAM_SUCCESS; + } else { + unlink(PW_TMPFILE); + return PAM_AUTHTOK_ERR; + } +} + +#ifdef HELPER_COMPILE +int +unix_update_shadow(const char *forwho, char *towhat) +#else +int +unix_update_shadow(pam_handle_t *pamh, const char *forwho, char *towhat) +#endif +{ + struct spwd *spwdent = NULL, *stmpent = NULL; + struct stat st; + FILE *pwfile, *opwfile; + int err = 1; + int oldmask; +#ifdef WITH_SELINUX + security_context_t prev_context=NULL; +#endif + + spwdent = getspnam(forwho); + if (spwdent == NULL) { + return PAM_USER_UNKNOWN; + } + oldmask = umask(077); + +#ifdef WITH_SELINUX + if (SELINUX_ENABLED) { + security_context_t shadow_context=NULL; + if (getfilecon("/etc/shadow",&shadow_context)<0) { + return PAM_AUTHTOK_ERR; + }; + if (getfscreatecon(&prev_context)<0) { + freecon(shadow_context); + return PAM_AUTHTOK_ERR; + } + if (setfscreatecon(shadow_context)) { + freecon(shadow_context); + freecon(prev_context); + return PAM_AUTHTOK_ERR; + } + freecon(shadow_context); + } +#endif + pwfile = fopen(SH_TMPFILE, "w"); + umask(oldmask); + if (pwfile == NULL) { + err = 1; + goto done; + } + + opwfile = fopen("/etc/shadow", "r"); + if (opwfile == NULL) { + fclose(pwfile); + err = 1; + goto done; + } + + if (fstat(fileno(opwfile), &st) == -1) { + fclose(opwfile); + fclose(pwfile); + err = 1; + goto done; + } + + if (fchown(fileno(pwfile), st.st_uid, st.st_gid) == -1) { + fclose(opwfile); + fclose(pwfile); + err = 1; + goto done; + } + if (fchmod(fileno(pwfile), st.st_mode) == -1) { + fclose(opwfile); + fclose(pwfile); + err = 1; + goto done; + } + + stmpent = fgetspent(opwfile); + while (stmpent) { + + if (!strcmp(stmpent->sp_namp, forwho)) { + stmpent->sp_pwdp = towhat; + stmpent->sp_lstchg = time(NULL) / (60 * 60 * 24); + err = 0; + D(("Set password %s for %s", stmpent->sp_pwdp, forwho)); + } + + if (putspent(stmpent, pwfile)) { + D(("error writing entry to shadow file: %m")); + err = 1; + break; + } + + stmpent = fgetspent(opwfile); + } + fclose(opwfile); + + if (fclose(pwfile)) { + D(("error writing entries to shadow file: %m")); + err = 1; + } + + done: + if (!err) { + if (!rename(SH_TMPFILE, "/etc/shadow")) +#ifdef HELPER_COMPILE + helper_log_err( +#else + pam_syslog(pamh, +#endif + LOG_NOTICE, "password changed for %s", forwho); + else + err = 1; + } + +#ifdef WITH_SELINUX + if (SELINUX_ENABLED) { + if (setfscreatecon(prev_context)) { + err = 1; + } + if (prev_context) + freecon(prev_context); + prev_context=NULL; + } +#endif + + if (!err) { + return PAM_SUCCESS; + } else { + unlink(SH_TMPFILE); + return PAM_AUTHTOK_ERR; + } +} + +#ifdef HELPER_COMPILE + +int +helper_verify_password(const char *name, const char *p, int nullok) +{ + struct passwd *pwd = NULL; + char *salt = NULL; + int retval; + + retval = get_pwd_hash(name, &pwd, &salt); + + if (pwd == NULL || salt == NULL) { + helper_log_err(LOG_WARNING, "check pass; user unknown"); + retval = PAM_USER_UNKNOWN; + } else { + retval = verify_pwd_hash(p, salt, nullok); + } + + if (salt) { + _pam_overwrite(salt); + _pam_drop(salt); + } + + p = NULL; /* no longer needed here */ + + return retval; +} + +void +helper_log_err(int err, const char *format, ...) +{ + va_list args; + + va_start(args, format); + openlog(HELPER_COMPILE, LOG_CONS | LOG_PID, LOG_AUTHPRIV); + vsyslog(err, format, args); + va_end(args); + closelog(); +} + +static void +su_sighandler(int sig) +{ +#ifndef SA_RESETHAND + /* emulate the behaviour of the SA_RESETHAND flag */ + if ( sig == SIGILL || sig == SIGTRAP || sig == SIGBUS || sig = SIGSERV ) + signal(sig, SIG_DFL); +#endif + if (sig > 0) { + _exit(sig); + } +} + +void +setup_signals(void) +{ + struct sigaction action; /* posix signal structure */ + + /* + * Setup signal handlers + */ + (void) memset((void *) &action, 0, sizeof(action)); + action.sa_handler = su_sighandler; +#ifdef SA_RESETHAND + action.sa_flags = SA_RESETHAND; +#endif + (void) sigaction(SIGILL, &action, NULL); + (void) sigaction(SIGTRAP, &action, NULL); + (void) sigaction(SIGBUS, &action, NULL); + (void) sigaction(SIGSEGV, &action, NULL); + action.sa_handler = SIG_IGN; + action.sa_flags = 0; + (void) sigaction(SIGTERM, &action, NULL); + (void) sigaction(SIGHUP, &action, NULL); + (void) sigaction(SIGINT, &action, NULL); + (void) sigaction(SIGQUIT, &action, NULL); +} + +char * +getuidname(uid_t uid) +{ + struct passwd *pw; + static char username[256]; + + pw = getpwuid(uid); + if (pw == NULL) + return NULL; + + strncpy(username, pw->pw_name, sizeof(username)); + username[sizeof(username) - 1] = '\0'; + + return username; +} + +int +read_passwords(int fd, int npass, char **passwords) +{ + int rbytes = 0; + int offset = 0; + int i = 0; + char *pptr; + while (npass > 0) { + rbytes = read(fd, passwords[i]+offset, MAXPASS-offset); + + if (rbytes < 0) { + if (errno == EINTR) continue; + break; + } + if (rbytes == 0) + break; + + while (npass > 0 && (pptr=memchr(passwords[i]+offset, '\0', rbytes)) + != NULL) { + rbytes -= pptr - (passwords[i]+offset) + 1; + i++; + offset = 0; + npass--; + if (rbytes > 0) { + if (npass > 0) + memcpy(passwords[i], pptr+1, rbytes); + memset(pptr+1, '\0', rbytes); + } + } + offset += rbytes; + } + + /* clear up */ + if (offset > 0 && npass > 0) { + memset(passwords[i], '\0', offset); + } + + return i; +} + +#endif +/* ****************************************************************** * + * Copyright (c) Jan Rêkorajski 1999. + * Copyright (c) Andrew G. Morgan 1996-8. + * Copyright (c) Alex O. Yuriev, 1996. + * Copyright (c) Cristian Gafton 1996. + * Copyright (c) Red Hat, Inc. 1996, 2007, 2008. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, and the entire permission notice in its entirety, + * including the disclaimer of warranties. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * ALTERNATIVELY, this product may be distributed under the terms of + * the GNU Public License, in which case the provisions of the GPL are + * required INSTEAD OF the above restrictions. (This clause is + * necessary due to a potential bad interaction between the GPL and + * the restrictions contained in a BSD-style copyright.) + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + */ diff --git a/modules/pam_unix/passverify.h b/modules/pam_unix/passverify.h new file mode 100644 index 00000000..e8e112d0 --- /dev/null +++ b/modules/pam_unix/passverify.h @@ -0,0 +1,124 @@ +/* + * Copyright information at end of file. + */ + +#include <sys/types.h> +#include <pwd.h> +#include <security/pam_modules.h> + +#define PAM_UNIX_RUN_HELPER PAM_CRED_INSUFFICIENT + +#define MAXPASS 200 /* the maximum length of a password */ + +#define OLD_PASSWORDS_FILE "/etc/security/opasswd" + +int +verify_pwd_hash(const char *p, char *hash, unsigned int nullok); + +int +is_pwd_shadowed(const struct passwd *pwd); + +char * +crypt_md5_wrapper(const char *pass_new); + +char * +create_password_hash(const char *password, unsigned int ctrl, int rounds); + +int +unix_selinux_confined(void); + +int +lock_pwdf(void); + +void +unlock_pwdf(void); + +int +save_old_password(const char *forwho, const char *oldpass, + int howmany); + +#ifdef HELPER_COMPILE +void +helper_log_err(int err, const char *format,...); + +int +helper_verify_password(const char *name, const char *p, int nullok); + +void +setup_signals(void); + +char * +getuidname(uid_t uid); + +int +read_passwords(int fd, int npass, char **passwords); + +int +get_account_info(const char *name, + struct passwd **pwd, struct spwd **spwdent); + +int +get_pwd_hash(const char *name, + struct passwd **pwd, char **hash); + +int +check_shadow_expiry(struct spwd *spent, int *daysleft); + +int +unix_update_passwd(const char *forwho, const char *towhat); + +int +unix_update_shadow(const char *forwho, char *towhat); +#else +int +get_account_info(pam_handle_t *pamh, const char *name, + struct passwd **pwd, struct spwd **spwdent); + +int +get_pwd_hash(pam_handle_t *pamh, const char *name, + struct passwd **pwd, char **hash); + +int +check_shadow_expiry(pam_handle_t *pamh, struct spwd *spent, int *daysleft); + +int +unix_update_passwd(pam_handle_t *pamh, const char *forwho, const char *towhat); + +int +unix_update_shadow(pam_handle_t *pamh, const char *forwho, char *towhat); +#endif + +/* ****************************************************************** * + * Copyright (c) Red Hat, Inc. 2007. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, and the entire permission notice in its entirety, + * including the disclaimer of warranties. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * ALTERNATIVELY, this product may be distributed under the terms of + * the GNU Public License, in which case the provisions of the GPL are + * required INSTEAD OF the above restrictions. (This clause is + * necessary due to a potential bad interaction between the GPL and + * the restrictions contained in a BSD-style copyright.) + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + */ diff --git a/modules/pam_unix/support.c b/modules/pam_unix/support.c new file mode 100644 index 00000000..b82cad26 --- /dev/null +++ b/modules/pam_unix/support.c @@ -0,0 +1,893 @@ +/* + * Copyright information at end of file. + */ + +#include "config.h" + +#include <stdlib.h> +#include <unistd.h> +#include <stdarg.h> +#include <stdio.h> +#include <string.h> +#include <malloc.h> +#include <pwd.h> +#include <shadow.h> +#include <limits.h> +#include <utmp.h> +#include <errno.h> +#include <signal.h> +#include <ctype.h> +#include <syslog.h> +#include <sys/resource.h> +#include <rpcsvc/ypclnt.h> + +#include <security/_pam_macros.h> +#include <security/pam_modules.h> +#include <security/pam_ext.h> +#include <security/pam_modutil.h> + +#include "support.h" +#include "passverify.h" +#ifdef WITH_SELINUX +#include <selinux/selinux.h> +#define SELINUX_ENABLED is_selinux_enabled()>0 +#else +#define SELINUX_ENABLED 0 +#endif + +/* this is a front-end for module-application conversations */ + +int _make_remark(pam_handle_t * pamh, unsigned int ctrl, + int type, const char *text) +{ + int retval = PAM_SUCCESS; + + if (off(UNIX__QUIET, ctrl)) { + retval = pam_prompt(pamh, type, NULL, "%s", text); + } + return retval; +} + +/* + * set the control flags for the UNIX module. + */ + +int _set_ctrl(pam_handle_t *pamh, int flags, int *remember, int *rounds, + int argc, const char **argv) +{ + unsigned int ctrl; + + D(("called.")); + + ctrl = UNIX_DEFAULTS; /* the default selection of options */ + + /* set some flags manually */ + + if (getuid() == 0 && !(flags & PAM_CHANGE_EXPIRED_AUTHTOK)) { + D(("IAMROOT")); + set(UNIX__IAMROOT, ctrl); + } + if (flags & PAM_UPDATE_AUTHTOK) { + D(("UPDATE_AUTHTOK")); + set(UNIX__UPDATE, ctrl); + } + if (flags & PAM_PRELIM_CHECK) { + D(("PRELIM_CHECK")); + set(UNIX__PRELIM, ctrl); + } + if (flags & PAM_SILENT) { + D(("SILENT")); + set(UNIX__QUIET, ctrl); + } + /* now parse the arguments to this module */ + + while (argc-- > 0) { + int j; + + D(("pam_unix arg: %s", *argv)); + + for (j = 0; j < UNIX_CTRLS_; ++j) { + if (unix_args[j].token + && !strncmp(*argv, unix_args[j].token, strlen(unix_args[j].token))) { + break; + } + } + + if (j >= UNIX_CTRLS_) { + pam_syslog(pamh, LOG_ERR, + "unrecognized option [%s]", *argv); + } else { + ctrl &= unix_args[j].mask; /* for turning things off */ + ctrl |= unix_args[j].flag; /* for turning things on */ + + if (remember != NULL) { + if (j == UNIX_REMEMBER_PASSWD) { + *remember = strtol(*argv + 9, NULL, 10); + if ((*remember == INT_MIN) || (*remember == INT_MAX)) + *remember = -1; + if (*remember > 400) + *remember = 400; + } + } + if (rounds != NULL) { + if (j == UNIX_ALGO_ROUNDS) { + *rounds = strtol(*argv + 7, NULL, 10); + if ((*rounds < 1000) || (*rounds == INT_MAX)) + /* don't care about bogus values */ + unset(UNIX_ALGO_ROUNDS, ctrl); + if (*rounds >= 10000000) + *rounds = 9999999; + } + } + } + + ++argv; /* step to next argument */ + } + + if (flags & PAM_DISALLOW_NULL_AUTHTOK) { + D(("DISALLOW_NULL_AUTHTOK")); + set(UNIX__NONULL, ctrl); + } + + /* auditing is a more sensitive version of debug */ + + if (on(UNIX_AUDIT, ctrl)) { + set(UNIX_DEBUG, ctrl); + } + /* return the set of flags */ + + D(("done.")); + return ctrl; +} + +static void _cleanup(pam_handle_t * pamh UNUSED, void *x, int error_status UNUSED) +{ + _pam_delete(x); +} + +/* ************************************************************** * + * Useful non-trivial functions * + * ************************************************************** */ + + /* + * the following is used to keep track of the number of times a user fails + * to authenticate themself. + */ + +#define FAIL_PREFIX "-UN*X-FAIL-" +#define UNIX_MAX_RETRIES 3 + +struct _pam_failed_auth { + char *user; /* user that's failed to be authenticated */ + char *name; /* attempt from user with name */ + int uid; /* uid of calling user */ + int euid; /* euid of calling process */ + int count; /* number of failures so far */ +}; + +#ifndef PAM_DATA_REPLACE +#error "Need to get an updated libpam 0.52 or better" +#endif + +static void _cleanup_failures(pam_handle_t * pamh, void *fl, int err) +{ + int quiet; + const void *service = NULL; + const void *ruser = NULL; + const void *rhost = NULL; + const void *tty = NULL; + struct _pam_failed_auth *failure; + + D(("called")); + + quiet = err & PAM_DATA_SILENT; /* should we log something? */ + err &= PAM_DATA_REPLACE; /* are we just replacing data? */ + failure = (struct _pam_failed_auth *) fl; + + if (failure != NULL) { + + if (!quiet && !err) { /* under advisement from Sun,may go away */ + + /* log the number of authentication failures */ + if (failure->count > 1) { + (void) pam_get_item(pamh, PAM_SERVICE, + &service); + (void) pam_get_item(pamh, PAM_RUSER, + &ruser); + (void) pam_get_item(pamh, PAM_RHOST, + &rhost); + (void) pam_get_item(pamh, PAM_TTY, + &tty); + pam_syslog(pamh, LOG_NOTICE, + "%d more authentication failure%s; " + "logname=%s uid=%d euid=%d " + "tty=%s ruser=%s rhost=%s " + "%s%s", + failure->count - 1, failure->count == 2 ? "" : "s", + failure->name, failure->uid, failure->euid, + tty ? (const char *)tty : "", ruser ? (const char *)ruser : "", + rhost ? (const char *)rhost : "", + (failure->user && failure->user[0] != '\0') + ? " user=" : "", failure->user + ); + + if (failure->count > UNIX_MAX_RETRIES) { + pam_syslog(pamh, LOG_ALERT, + "service(%s) ignoring max retries; %d > %d", + service == NULL ? "**unknown**" : (const char *)service, + failure->count, + UNIX_MAX_RETRIES); + } + } + } + _pam_delete(failure->user); /* tidy up */ + _pam_delete(failure->name); /* tidy up */ + free(failure); + } +} + +/* + * _unix_getpwnam() searches only /etc/passwd and NIS to find user information + */ +static void _unix_cleanup(pam_handle_t *pamh UNUSED, void *data, int error_status UNUSED) +{ + free(data); +} + +int _unix_getpwnam(pam_handle_t *pamh, const char *name, + int files, int nis, struct passwd **ret) +{ + FILE *passwd; + char buf[16384]; + int matched = 0, buflen; + char *slogin, *spasswd, *suid, *sgid, *sgecos, *shome, *sshell, *p; + + memset(buf, 0, sizeof(buf)); + + if (!matched && files) { + int userlen = strlen(name); + passwd = fopen("/etc/passwd", "r"); + if (passwd != NULL) { + while (fgets(buf, sizeof(buf), passwd) != NULL) { + if ((buf[userlen] == ':') && + (strncmp(name, buf, userlen) == 0)) { + p = buf + strlen(buf) - 1; + while (isspace(*p) && (p >= buf)) { + *p-- = '\0'; + } + matched = 1; + break; + } + } + fclose(passwd); + } + } + + if (!matched && nis) { + char *userinfo = NULL, *domain = NULL; + int len = 0, i; + len = yp_get_default_domain(&domain); + if (len == YPERR_SUCCESS) { + len = yp_bind(domain); + } + if (len == YPERR_SUCCESS) { + i = yp_match(domain, "passwd.byname", name, + strlen(name), &userinfo, &len); + yp_unbind(domain); + if ((i == YPERR_SUCCESS) && ((size_t)len < sizeof(buf))) { + strncpy(buf, userinfo, sizeof(buf) - 1); + buf[sizeof(buf) - 1] = '\0'; + matched = 1; + } + } + } + + if (matched && (ret != NULL)) { + *ret = NULL; + + slogin = buf; + + spasswd = strchr(slogin, ':'); + if (spasswd == NULL) { + return matched; + } + *spasswd++ = '\0'; + + suid = strchr(spasswd, ':'); + if (suid == NULL) { + return matched; + } + *suid++ = '\0'; + + sgid = strchr(suid, ':'); + if (sgid == NULL) { + return matched; + } + *sgid++ = '\0'; + + sgecos = strchr(sgid, ':'); + if (sgecos == NULL) { + return matched; + } + *sgecos++ = '\0'; + + shome = strchr(sgecos, ':'); + if (shome == NULL) { + return matched; + } + *shome++ = '\0'; + + sshell = strchr(shome, ':'); + if (sshell == NULL) { + return matched; + } + *sshell++ = '\0'; + + buflen = sizeof(struct passwd) + + strlen(slogin) + 1 + + strlen(spasswd) + 1 + + strlen(suid) + 1 + + strlen(sgid) + 1 + + strlen(sgecos) + 1 + + strlen(shome) + 1 + + strlen(sshell) + 1; + *ret = malloc(buflen); + if (*ret == NULL) { + return matched; + } + memset(*ret, '\0', buflen); + + (*ret)->pw_uid = strtol(suid, &p, 10); + if ((strlen(suid) == 0) || (*p != '\0')) { + free(*ret); + *ret = NULL; + return matched; + } + + (*ret)->pw_gid = strtol(sgid, &p, 10); + if ((strlen(sgid) == 0) || (*p != '\0')) { + free(*ret); + *ret = NULL; + return matched; + } + + p = ((char*)(*ret)) + sizeof(struct passwd); + (*ret)->pw_name = strcpy(p, slogin); + p += strlen(p) + 1; + (*ret)->pw_passwd = strcpy(p, spasswd); + p += strlen(p) + 1; + (*ret)->pw_gecos = strcpy(p, sgecos); + p += strlen(p) + 1; + (*ret)->pw_dir = strcpy(p, shome); + p += strlen(p) + 1; + (*ret)->pw_shell = strcpy(p, sshell); + + snprintf(buf, sizeof(buf), "_pam_unix_getpwnam_%s", name); + + if (pam_set_data(pamh, buf, + *ret, _unix_cleanup) != PAM_SUCCESS) { + free(*ret); + *ret = NULL; + } + } + + return matched; +} + +/* + * _unix_comsefromsource() is a quick check to see if information about a given + * user comes from a particular source (just files and nis for now) + * + */ +int _unix_comesfromsource(pam_handle_t *pamh, + const char *name, int files, int nis) +{ + return _unix_getpwnam(pamh, name, files, nis, NULL); +} + +/* + * verify the password of a user + */ + +#include <sys/types.h> +#include <sys/wait.h> + +static int _unix_run_helper_binary(pam_handle_t *pamh, const char *passwd, + unsigned int ctrl, const char *user) +{ + int retval, child, fds[2]; + void (*sighandler)(int) = NULL; + + D(("called.")); + /* create a pipe for the password */ + if (pipe(fds) != 0) { + D(("could not make pipe")); + return PAM_AUTH_ERR; + } + + if (off(UNIX_NOREAP, ctrl)) { + /* + * This code arranges that the demise of the child does not cause + * the application to receive a signal it is not expecting - which + * may kill the application or worse. + * + * The "noreap" module argument is provided so that the admin can + * override this behavior. + */ + sighandler = signal(SIGCHLD, SIG_DFL); + } + + /* fork */ + child = fork(); + if (child == 0) { + int i=0; + struct rlimit rlim; + static char *envp[] = { NULL }; + char *args[] = { NULL, NULL, NULL, NULL }; + + /* XXX - should really tidy up PAM here too */ + + close(0); close(1); + /* reopen stdin as pipe */ + close(fds[1]); + dup2(fds[0], STDIN_FILENO); + + if (getrlimit(RLIMIT_NOFILE,&rlim)==0) { + for (i=2; i < (int)rlim.rlim_max; i++) { + if (fds[0] != i) + close(i); + } + } + + if (geteuid() == 0) { + /* must set the real uid to 0 so the helper will not error + out if pam is called from setuid binary (su, sudo...) */ + setuid(0); + } + + /* exec binary helper */ + args[0] = strdup(CHKPWD_HELPER); + args[1] = x_strdup(user); + if (off(UNIX__NONULL, ctrl)) { /* this means we've succeeded */ + args[2]=strdup("nullok"); + } else { + args[2]=strdup("nonull"); + } + + execve(CHKPWD_HELPER, args, envp); + + /* should not get here: exit with error */ + D(("helper binary is not available")); + exit(PAM_AUTHINFO_UNAVAIL); + } else if (child > 0) { + /* wait for child */ + /* if the stored password is NULL */ + int rc=0; + if (passwd != NULL) { /* send the password to the child */ + write(fds[1], passwd, strlen(passwd)+1); + passwd = NULL; + } else { + write(fds[1], "", 1); /* blank password */ + } + close(fds[0]); /* close here to avoid possible SIGPIPE above */ + close(fds[1]); + rc=waitpid(child, &retval, 0); /* wait for helper to complete */ + if (rc<0) { + pam_syslog(pamh, LOG_ERR, "unix_chkpwd waitpid returned %d: %m", rc); + retval = PAM_AUTH_ERR; + } else { + retval = WEXITSTATUS(retval); + } + } else { + D(("fork failed")); + close(fds[0]); + close(fds[1]); + retval = PAM_AUTH_ERR; + } + + if (sighandler != SIG_ERR) { + (void) signal(SIGCHLD, sighandler); /* restore old signal handler */ + } + + D(("returning %d", retval)); + return retval; +} + +/* + * _unix_blankpasswd() is a quick check for a blank password + * + * returns TRUE if user does not have a password + * - to avoid prompting for one in such cases (CG) + */ + +int +_unix_blankpasswd (pam_handle_t *pamh, unsigned int ctrl, const char *name) +{ + struct passwd *pwd = NULL; + char *salt = NULL; + int retval; + + D(("called")); + + /* + * This function does not have to be too smart if something goes + * wrong, return FALSE and let this case to be treated somewhere + * else (CG) + */ + + if (on(UNIX__NONULL, ctrl)) + return 0; /* will fail but don't let on yet */ + + /* UNIX passwords area */ + + retval = get_pwd_hash(pamh, name, &pwd, &salt); + + if (retval == PAM_UNIX_RUN_HELPER) { + /* salt will not be set here so we can return immediately */ + if (_unix_run_helper_binary(pamh, NULL, ctrl, name) == PAM_SUCCESS) + return 1; + else + return 0; + } + + /* Does this user have a password? */ + if (salt == NULL) { + retval = 0; + } else { + if (strlen(salt) == 0) + retval = 1; + else + retval = 0; + } + + /* tidy up */ + + if (salt) + _pam_delete(salt); + + return retval; +} + +int _unix_verify_password(pam_handle_t * pamh, const char *name + ,const char *p, unsigned int ctrl) +{ + struct passwd *pwd = NULL; + char *salt = NULL; + char *data_name; + int retval; + + + D(("called")); + +#ifdef HAVE_PAM_FAIL_DELAY + if (off(UNIX_NODELAY, ctrl)) { + D(("setting delay")); + (void) pam_fail_delay(pamh, 2000000); /* 2 sec delay for on failure */ + } +#endif + + /* locate the entry for this user */ + + D(("locating user's record")); + + retval = get_pwd_hash(pamh, name, &pwd, &salt); + + data_name = (char *) malloc(sizeof(FAIL_PREFIX) + strlen(name)); + if (data_name == NULL) { + pam_syslog(pamh, LOG_CRIT, "no memory for data-name"); + } else { + strcpy(data_name, FAIL_PREFIX); + strcpy(data_name + sizeof(FAIL_PREFIX) - 1, name); + } + + if (retval != PAM_SUCCESS) { + if (retval == PAM_UNIX_RUN_HELPER) { + D(("running helper binary")); + retval = _unix_run_helper_binary(pamh, p, ctrl, name); + } else { + D(("user's record unavailable")); + p = NULL; + if (on(UNIX_AUDIT, ctrl)) { + /* this might be a typo and the user has given a password + instead of a username. Careful with this. */ + pam_syslog(pamh, LOG_WARNING, + "check pass; user (%s) unknown", name); + } else { + name = NULL; + if (on(UNIX_DEBUG, ctrl) || pwd == NULL) { + pam_syslog(pamh, LOG_WARNING, + "check pass; user unknown"); + } else { + /* don't log failure as another pam module can succeed */ + goto cleanup; + } + } + } + } else { + retval = verify_pwd_hash(p, salt, off(UNIX__NONULL, ctrl)); + } + + if (retval == PAM_SUCCESS) { + if (data_name) /* reset failures */ + pam_set_data(pamh, data_name, NULL, _cleanup_failures); + } else { + if (data_name != NULL) { + struct _pam_failed_auth *new = NULL; + const struct _pam_failed_auth *old = NULL; + + /* get a failure recorder */ + + new = (struct _pam_failed_auth *) + malloc(sizeof(struct _pam_failed_auth)); + + if (new != NULL) { + + const char *login_name; + const void *void_old; + + + login_name = pam_modutil_getlogin(pamh); + if (login_name == NULL) { + login_name = ""; + } + + new->user = x_strdup(name ? name : ""); + new->uid = getuid(); + new->euid = geteuid(); + new->name = x_strdup(login_name); + + /* any previous failures for this user ? */ + if (pam_get_data(pamh, data_name, &void_old) + == PAM_SUCCESS) + old = void_old; + else + old = NULL; + + if (old != NULL) { + new->count = old->count + 1; + if (new->count >= UNIX_MAX_RETRIES) { + retval = PAM_MAXTRIES; + } + } else { + const void *service=NULL; + const void *ruser=NULL; + const void *rhost=NULL; + const void *tty=NULL; + + (void) pam_get_item(pamh, PAM_SERVICE, + &service); + (void) pam_get_item(pamh, PAM_RUSER, + &ruser); + (void) pam_get_item(pamh, PAM_RHOST, + &rhost); + (void) pam_get_item(pamh, PAM_TTY, + &tty); + + pam_syslog(pamh, LOG_NOTICE, + "authentication failure; " + "logname=%s uid=%d euid=%d " + "tty=%s ruser=%s rhost=%s " + "%s%s", + new->name, new->uid, new->euid, + tty ? (const char *)tty : "", + ruser ? (const char *)ruser : "", + rhost ? (const char *)rhost : "", + (new->user && new->user[0] != '\0') + ? " user=" : "", + new->user + ); + new->count = 1; + } + + pam_set_data(pamh, data_name, new, _cleanup_failures); + + } else { + pam_syslog(pamh, LOG_CRIT, + "no memory for failure recorder"); + } + } + } + +cleanup: + if (data_name) + _pam_delete(data_name); + if (salt) + _pam_delete(salt); + + D(("done [%d].", retval)); + + return retval; +} + +/* + * obtain a password from the user + */ + +int _unix_read_password(pam_handle_t * pamh + ,unsigned int ctrl + ,const char *comment + ,const char *prompt1 + ,const char *prompt2 + ,const char *data_name + ,const void **pass) +{ + int authtok_flag; + int retval = PAM_SUCCESS; + char *token; + + D(("called")); + + /* + * make sure nothing inappropriate gets returned + */ + + *pass = token = NULL; + + /* + * which authentication token are we getting? + */ + + authtok_flag = on(UNIX__OLD_PASSWD, ctrl) ? PAM_OLDAUTHTOK : PAM_AUTHTOK; + + /* + * should we obtain the password from a PAM item ? + */ + + if (on(UNIX_TRY_FIRST_PASS, ctrl) || on(UNIX_USE_FIRST_PASS, ctrl)) { + retval = pam_get_item(pamh, authtok_flag, pass); + if (retval != PAM_SUCCESS) { + /* very strange. */ + pam_syslog(pamh, LOG_ALERT, + "pam_get_item returned error to unix-read-password" + ); + return retval; + } else if (*pass != NULL) { /* we have a password! */ + return PAM_SUCCESS; + } else if (on(UNIX_USE_FIRST_PASS, ctrl)) { + return PAM_AUTHTOK_RECOVERY_ERR; /* didn't work */ + } else if (on(UNIX_USE_AUTHTOK, ctrl) + && off(UNIX__OLD_PASSWD, ctrl)) { + return PAM_AUTHTOK_ERR; + } + } + /* + * getting here implies we will have to get the password from the + * user directly. + */ + + { + int replies=1; + char *resp[2] = { NULL, NULL }; + + if (comment != NULL && off(UNIX__QUIET, ctrl)) { + retval = pam_info(pamh, "%s", comment); + } + + if (retval == PAM_SUCCESS) { + retval = pam_prompt(pamh, PAM_PROMPT_ECHO_OFF, + &resp[0], "%s", prompt1); + + if (retval == PAM_SUCCESS && prompt2 != NULL) { + retval = pam_prompt(pamh, PAM_PROMPT_ECHO_OFF, + &resp[1], "%s", prompt2); + ++replies; + } + } + + if (resp[0] != NULL && resp[replies-1] != NULL) { + /* interpret the response */ + + if (retval == PAM_SUCCESS) { /* a good conversation */ + + token = resp[0]; + if (token != NULL) { + if (replies == 2) { + /* verify that password entered correctly */ + if (strcmp(token, resp[replies - 1])) { + /* mistyped */ + retval = PAM_AUTHTOK_RECOVERY_ERR; + _make_remark(pamh, ctrl, + PAM_ERROR_MSG, MISTYPED_PASS); + } + } + } else { + pam_syslog(pamh, LOG_NOTICE, + "could not recover authentication token"); + } + + } + + } else { + retval = (retval == PAM_SUCCESS) + ? PAM_AUTHTOK_RECOVERY_ERR : retval; + } + + resp[0] = NULL; + if (replies > 1) + _pam_delete(resp[1]); + } + + if (retval != PAM_SUCCESS) { + _pam_delete(token); + + if (on(UNIX_DEBUG, ctrl)) + pam_syslog(pamh, LOG_DEBUG, + "unable to obtain a password"); + return retval; + } + /* 'token' is the entered password */ + + if (off(UNIX_NOT_SET_PASS, ctrl)) { + + /* we store this password as an item */ + + retval = pam_set_item(pamh, authtok_flag, token); + _pam_delete(token); /* clean it up */ + if (retval != PAM_SUCCESS + || (retval = pam_get_item(pamh, authtok_flag, pass)) + != PAM_SUCCESS) { + + *pass = NULL; + pam_syslog(pamh, LOG_CRIT, "error manipulating password"); + return retval; + + } + } else { + /* + * then store it as data specific to this module. pam_end() + * will arrange to clean it up. + */ + + retval = pam_set_data(pamh, data_name, (void *) token, _cleanup); + if (retval != PAM_SUCCESS) { + pam_syslog(pamh, LOG_CRIT, + "error manipulating password data [%s]", + pam_strerror(pamh, retval)); + _pam_delete(token); + return retval; + } + *pass = token; + token = NULL; /* break link to password */ + } + + return PAM_SUCCESS; +} + +/* ****************************************************************** * + * Copyright (c) Jan Rêkorajski 1999. + * Copyright (c) Andrew G. Morgan 1996-8. + * Copyright (c) Alex O. Yuriev, 1996. + * Copyright (c) Cristian Gafton 1996. + * Copyright (c) Red Hat, Inc. 2007. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, and the entire permission notice in its entirety, + * including the disclaimer of warranties. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * ALTERNATIVELY, this product may be distributed under the terms of + * the GNU Public License, in which case the provisions of the GPL are + * required INSTEAD OF the above restrictions. (This clause is + * necessary due to a potential bad interaction between the GPL and + * the restrictions contained in a BSD-style copyright.) + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + */ diff --git a/modules/pam_unix/support.h b/modules/pam_unix/support.h new file mode 100644 index 00000000..3ccdc5c7 --- /dev/null +++ b/modules/pam_unix/support.h @@ -0,0 +1,162 @@ +/* + * $Id: support.h,v 1.14 2008/01/23 15:35:13 t8m Exp $ + */ + +#ifndef _PAM_UNIX_SUPPORT_H +#define _PAM_UNIX_SUPPORT_H + +#include <pwd.h> + +/* + * here is the string to inform the user that the new passwords they + * typed were not the same. + */ + +#define MISTYPED_PASS "Sorry, passwords do not match" + +/* type definition for the control options */ + +typedef struct { + const char *token; + unsigned int mask; /* shall assume 32 bits of flags */ + unsigned int flag; +} UNIX_Ctrls; + +/* + * macro to determine if a given flag is on + */ + +#define on(x,ctrl) (unix_args[x].flag & ctrl) + +/* + * macro to determine that a given flag is NOT on + */ + +#define off(x,ctrl) (!on(x,ctrl)) + +/* + * macro to turn on/off a ctrl flag manually + */ + +#define set(x,ctrl) (ctrl = ((ctrl)&unix_args[x].mask)|unix_args[x].flag) +#define unset(x,ctrl) (ctrl &= ~(unix_args[x].flag)) + +/* the generic mask */ + +#define _ALL_ON_ (~0U) + +/* end of macro definitions definitions for the control flags */ + +/* ****************************************************************** * + * ctrl flags proper.. + */ + +/* + * here are the various options recognized by the unix module. They + * are enumerated here and then defined below. Internal arguments are + * given NULL tokens. + */ + +#define UNIX__OLD_PASSWD 0 /* internal */ +#define UNIX__VERIFY_PASSWD 1 /* internal */ +#define UNIX__IAMROOT 2 /* internal */ + +#define UNIX_AUDIT 3 /* print more things than debug.. + some information may be sensitive */ +#define UNIX_USE_FIRST_PASS 4 +#define UNIX_TRY_FIRST_PASS 5 +#define UNIX_NOT_SET_PASS 6 /* don't set the AUTHTOK items */ + +#define UNIX__PRELIM 7 /* internal */ +#define UNIX__UPDATE 8 /* internal */ +#define UNIX__NONULL 9 /* internal */ +#define UNIX__QUIET 10 /* internal */ +#define UNIX_USE_AUTHTOK 11 /* insist on reading PAM_AUTHTOK */ +#define UNIX_SHADOW 12 /* signal shadow on */ +#define UNIX_MD5_PASS 13 /* force the use of MD5 passwords */ +#define UNIX__NULLOK 14 /* Null token ok */ +#define UNIX_DEBUG 15 /* send more info to syslog(3) */ +#define UNIX_NODELAY 16 /* admin does not want a fail-delay */ +#define UNIX_NIS 17 /* wish to use NIS for pwd */ +#define UNIX_BIGCRYPT 18 /* use DEC-C2 crypt()^x function */ +#define UNIX_LIKE_AUTH 19 /* need to auth for setcred to work */ +#define UNIX_REMEMBER_PASSWD 20 /* Remember N previous passwords */ +#define UNIX_NOREAP 21 /* don't reap child process */ +#define UNIX_BROKEN_SHADOW 22 /* ignore errors reading password aging + * information during acct management */ +#define UNIX_SHA256_PASS 23 /* new password hashes will use SHA256 */ +#define UNIX_SHA512_PASS 24 /* new password hashes will use SHA512 */ +#define UNIX_ALGO_ROUNDS 25 /* optional number of rounds for new + password hash algorithms */ +/* -------------- */ +#define UNIX_CTRLS_ 26 /* number of ctrl arguments defined */ + + +static const UNIX_Ctrls unix_args[UNIX_CTRLS_] = +{ +/* symbol token name ctrl mask ctrl * + * ----------------------- ------------------- --------------------- -------- */ + +/* UNIX__OLD_PASSWD */ {NULL, _ALL_ON_, 01}, +/* UNIX__VERIFY_PASSWD */ {NULL, _ALL_ON_, 02}, +/* UNIX__IAMROOT */ {NULL, _ALL_ON_, 04}, +/* UNIX_AUDIT */ {"audit", _ALL_ON_, 010}, +/* UNIX_USE_FIRST_PASS */ {"use_first_pass", _ALL_ON_^(060), 020}, +/* UNIX_TRY_FIRST_PASS */ {"try_first_pass", _ALL_ON_^(060), 040}, +/* UNIX_NOT_SET_PASS */ {"not_set_pass", _ALL_ON_, 0100}, +/* UNIX__PRELIM */ {NULL, _ALL_ON_^(0600), 0200}, +/* UNIX__UPDATE */ {NULL, _ALL_ON_^(0600), 0400}, +/* UNIX__NONULL */ {NULL, _ALL_ON_, 01000}, +/* UNIX__QUIET */ {NULL, _ALL_ON_, 02000}, +/* UNIX_USE_AUTHTOK */ {"use_authtok", _ALL_ON_, 04000}, +/* UNIX_SHADOW */ {"shadow", _ALL_ON_, 010000}, +/* UNIX_MD5_PASS */ {"md5", _ALL_ON_^(0400000), 020000}, +/* UNIX__NULLOK */ {"nullok", _ALL_ON_^(01000), 0}, +/* UNIX_DEBUG */ {"debug", _ALL_ON_, 040000}, +/* UNIX_NODELAY */ {"nodelay", _ALL_ON_, 0100000}, +/* UNIX_NIS */ {"nis", _ALL_ON_, 0200000}, +/* UNIX_BIGCRYPT */ {"bigcrypt", _ALL_ON_^(020000), 0400000}, +/* UNIX_LIKE_AUTH */ {"likeauth", _ALL_ON_, 01000000}, +/* UNIX_REMEMBER_PASSWD */ {"remember=", _ALL_ON_, 02000000}, +/* UNIX_NOREAP */ {"noreap", _ALL_ON_, 04000000}, +/* UNIX_BROKEN_SHADOW */ {"broken_shadow", _ALL_ON_, 010000000}, +/* UNIX_SHA256_PASS */ {"sha256", _ALL_ON_^(040420000), 020000000}, +/* UNIX_SHA512_PASS */ {"sha512", _ALL_ON_^(020420000), 040000000}, +/* UNIX_ALGO_ROUNDS */ {"rounds=", _ALL_ON_, 0100000000}, +}; + +#define UNIX_DEFAULTS (unix_args[UNIX__NONULL].flag) + + +/* use this to free strings. ESPECIALLY password strings */ + +#define _pam_delete(xx) \ +{ \ + _pam_overwrite(xx); \ + _pam_drop(xx); \ +} + +extern int _make_remark(pam_handle_t * pamh, unsigned int ctrl + ,int type, const char *text); +extern int _set_ctrl(pam_handle_t * pamh, int flags, int *remember, int *rounds, + int argc, const char **argv); +extern int _unix_getpwnam (pam_handle_t *pamh, + const char *name, int files, int nis, + struct passwd **ret); +extern int _unix_comesfromsource (pam_handle_t *pamh, + const char *name, int files, int nis); +extern int _unix_blankpasswd(pam_handle_t *pamh,unsigned int ctrl, + const char *name); +extern int _unix_verify_password(pam_handle_t * pamh, const char *name + ,const char *p, unsigned int ctrl); +extern int _unix_read_password(pam_handle_t * pamh + ,unsigned int ctrl + ,const char *comment + ,const char *prompt1 + ,const char *prompt2 + ,const char *data_name + ,const void **pass); + +extern int _unix_run_verify_binary(pam_handle_t *pamh, + unsigned int ctrl, const char *user, int *daysleft); +#endif /* _PAM_UNIX_SUPPORT_H */ diff --git a/modules/pam_unix/tst-pam_unix b/modules/pam_unix/tst-pam_unix new file mode 100755 index 00000000..22922800 --- /dev/null +++ b/modules/pam_unix/tst-pam_unix @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_unix.so diff --git a/modules/pam_unix/unix_chkpwd.8 b/modules/pam_unix/unix_chkpwd.8 new file mode 100644 index 00000000..07c8e781 --- /dev/null +++ b/modules/pam_unix/unix_chkpwd.8 @@ -0,0 +1,38 @@ +.\" Title: unix_chkpwd +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "UNIX_CHKPWD" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +unix_chkpwd - Helper binary that verifies the password of the current user +.SH "SYNOPSIS" +.HP 12 +\fBunix_chkpwd\fR [\.\.\.] +.SH "DESCRIPTION" +.PP + +\fIunix_chkpwd\fR +is a helper program for the +\fIpam_unix\fR +module that verifies the password of the current user\. It also checks password and account expiration dates in +\fIshadow\fR\. It is not intended to be run directly from the command line and logs a security violation if done so\. +.PP +It is typically installed setuid root or setgid shadow\. +.PP +The interface of the helper \- command line options, and input/output data format are internal to the +\fIpam_unix\fR +module and it should not be called directly from applications\. +.SH "SEE ALSO" +.PP + +\fBpam_unix\fR(8) +.SH "AUTHOR" +.PP +Written by Andrew Morgan and other various people\. diff --git a/modules/pam_unix/unix_chkpwd.8.xml b/modules/pam_unix/unix_chkpwd.8.xml new file mode 100644 index 00000000..a10dbe33 --- /dev/null +++ b/modules/pam_unix/unix_chkpwd.8.xml @@ -0,0 +1,67 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="unix_chkpwd"> + + <refmeta> + <refentrytitle>unix_chkpwd</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="unix_chkpwd-name"> + <refname>unix_chkpwd</refname> + <refpurpose>Helper binary that verifies the password of the current user</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="unix_chkpwd-cmdsynopsis"> + <command>unix_chkpwd</command> + <arg choice="opt"> + ... + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="unix_chkpwd-description"> + + <title>DESCRIPTION</title> + + <para> + <emphasis>unix_chkpwd</emphasis> is a helper program for the + <emphasis>pam_unix</emphasis> module that verifies the + password of the current user. It also checks password and account + expiration dates in <emphasis>shadow</emphasis>. It is not intended to + be run directly from the command line and logs a security violation if + done so. + </para> + + <para> + It is typically installed setuid root or setgid shadow. + </para> + + <para> + The interface of the helper - command line options, and input/output + data format are internal to the <emphasis>pam_unix</emphasis> + module and it should not be called directly from applications. + </para> + </refsect1> + + <refsect1 id='unix_chkpwd-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>pam_unix</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='unix_chkpwd-author'> + <title>AUTHOR</title> + <para> + Written by Andrew Morgan and other various people. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_unix/unix_chkpwd.c b/modules/pam_unix/unix_chkpwd.c new file mode 100644 index 00000000..5f872d27 --- /dev/null +++ b/modules/pam_unix/unix_chkpwd.c @@ -0,0 +1,187 @@ +/* + * This program is designed to run setuid(root) or with sufficient + * privilege to read all of the unix password databases. It is designed + * to provide a mechanism for the current user (defined by this + * process' uid) to verify their own password. + * + * The password is read from the standard input. The exit status of + * this program indicates whether the user is authenticated or not. + * + * Copyright information is located at the end of the file. + * + */ + +#include "config.h" + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <syslog.h> +#include <unistd.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <pwd.h> +#include <shadow.h> +#include <signal.h> +#include <time.h> + +#include <security/_pam_types.h> +#include <security/_pam_macros.h> + +#include "passverify.h" + +static int _check_expiry(const char *uname) +{ + struct spwd *spent; + struct passwd *pwent; + int retval; + int daysleft; + + retval = get_account_info(uname, &pwent, &spent); + if (retval != PAM_SUCCESS) { + helper_log_err(LOG_ALERT, "could not obtain user info (%s)", uname); + printf("-1\n"); + return retval; + } + + if (spent == NULL) { + printf("-1\n"); + return retval; + } + + retval = check_shadow_expiry(spent, &daysleft); + printf("%d\n", daysleft); + return retval; +} + +int main(int argc, char *argv[]) +{ + char pass[MAXPASS + 1]; + char *option; + int npass, nullok; + int blankpass = 0; + int retval = PAM_AUTH_ERR; + char *user; + char *passwords[] = { pass }; + + /* + * Catch or ignore as many signal as possible. + */ + setup_signals(); + + /* + * we establish that this program is running with non-tty stdin. + * this is to discourage casual use. It does *NOT* prevent an + * intruder from repeatadly running this program to determine the + * password of the current user (brute force attack, but one for + * which the attacker must already have gained access to the user's + * account). + */ + + if (isatty(STDIN_FILENO) || argc != 3 ) { + helper_log_err(LOG_NOTICE + ,"inappropriate use of Unix helper binary [UID=%d]" + ,getuid()); + fprintf(stderr + ,"This binary is not designed for running in this way\n" + "-- the system administrator has been informed\n"); + sleep(10); /* this should discourage/annoy the user */ + return PAM_SYSTEM_ERR; + } + + /* + * Determine what the current user's name is. + * We must thus skip the check if the real uid is 0. + */ + if (getuid() == 0) { + user=argv[1]; + } + else { + user = getuidname(getuid()); + /* if the caller specifies the username, verify that user + matches it */ + if (strcmp(user, argv[1])) { + user = argv[1]; + /* no match -> permanently change to the real user and proceed */ + if (setuid(getuid()) != 0) + return PAM_AUTH_ERR; + } + } + + option=argv[2]; + + if (strcmp(option, "chkexpiry") == 0) + /* Check account information from the shadow file */ + return _check_expiry(argv[1]); + /* read the nullok/nonull option */ + else if (strcmp(option, "nullok") == 0) + nullok = 1; + else if (strcmp(option, "nonull") == 0) + nullok = 0; + else + return PAM_SYSTEM_ERR; + + /* read the password from stdin (a pipe from the pam_unix module) */ + + npass = read_passwords(STDIN_FILENO, 1, passwords); + + if (npass != 1) { /* is it a valid password? */ + helper_log_err(LOG_DEBUG, "no password supplied"); + *pass = '\0'; + } + + if (*pass == '\0') { + blankpass = 1; + } + + retval = helper_verify_password(user, pass, nullok); + + memset(pass, '\0', MAXPASS); /* clear memory of the password */ + + /* return pass or fail */ + + if (retval != PAM_SUCCESS) { + if (!nullok || !blankpass) + /* no need to log blank pass test */ + helper_log_err(LOG_NOTICE, "password check failed for user (%s)", user); + return PAM_AUTH_ERR; + } else { + return PAM_SUCCESS; + } +} + +/* + * Copyright (c) Andrew G. Morgan, 1996. All rights reserved + * Copyright (c) Red Hat, Inc., 2007,2008. All rights reserved + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, and the entire permission notice in its entirety, + * including the disclaimer of warranties. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * ALTERNATIVELY, this product may be distributed under the terms of + * the GNU Public License, in which case the provisions of the GPL are + * required INSTEAD OF the above restrictions. (This clause is + * necessary due to a potential bad interaction between the GPL and + * the restrictions contained in a BSD-style copyright.) + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + */ diff --git a/modules/pam_unix/unix_update.8 b/modules/pam_unix/unix_update.8 new file mode 100644 index 00000000..b9f1668b --- /dev/null +++ b/modules/pam_unix/unix_update.8 @@ -0,0 +1,37 @@ +.\" Title: unix_update +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "UNIX_UPDATE" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +unix_update - Helper binary that updates the password of a given user +.SH "SYNOPSIS" +.HP 12 +\fBunix_update\fR [\.\.\.] +.SH "DESCRIPTION" +.PP + +\fIunix_update\fR +is a helper program for the +\fIpam_unix\fR +module that updates the password of a given user\. It is not intended to be run directly from the command line and logs a security violation if done so\. +.PP +The purpose of the helper is to enable tighter confinement of login and password changing services\. The helper is thus called only when SELinux is enabled and in the enforcing mode on the system\. +.PP +The interface of the helper \- command line options, and input/output data format are internal to the +\fIpam_unix\fR +module and it should not be called directly from applications\. +.SH "SEE ALSO" +.PP + +\fBpam_unix\fR(8) +.SH "AUTHOR" +.PP +Written by Tomas Mraz and other various people\. diff --git a/modules/pam_unix/unix_update.8.xml b/modules/pam_unix/unix_update.8.xml new file mode 100644 index 00000000..07695951 --- /dev/null +++ b/modules/pam_unix/unix_update.8.xml @@ -0,0 +1,67 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="unix_update"> + + <refmeta> + <refentrytitle>unix_update</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="unix_update-name"> + <refname>unix_update</refname> + <refpurpose>Helper binary that updates the password of a given user</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="unix_update-cmdsynopsis"> + <command>unix_update</command> + <arg choice="opt"> + ... + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="unix_update-description"> + + <title>DESCRIPTION</title> + + <para> + <emphasis>unix_update</emphasis> is a helper program for the + <emphasis>pam_unix</emphasis> module that updates the + password of a given user. It is not intended to be run directly + from the command line and logs a security violation if done so. + </para> + + <para> + The purpose of the helper is to enable tighter confinement of + login and password changing services. The helper is thus called only + when SELinux is enabled and in the enforcing mode on the system. + </para> + + <para> + The interface of the helper - command line options, and input/output + data format are internal to the <emphasis>pam_unix</emphasis> + module and it should not be called directly from applications. + </para> + </refsect1> + + <refsect1 id='unix_update-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>pam_unix</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='unix_update-author'> + <title>AUTHOR</title> + <para> + Written by Tomas Mraz and other various people. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_unix/unix_update.c b/modules/pam_unix/unix_update.c new file mode 100644 index 00000000..f54a59ce --- /dev/null +++ b/modules/pam_unix/unix_update.c @@ -0,0 +1,188 @@ +/* + * This program is designed to run with sufficient privilege + * to read and write all of the unix password databases. + * Its purpose is to allow updating the databases when + * SELinux confinement of the caller domain prevents them to + * do that themselves. + * + * The password is read from the standard input. The exit status of + * this program indicates whether the password was updated or not. + * + * Copyright information is located at the end of the file. + * + */ + +#include "config.h" + +#include <stdarg.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <syslog.h> +#include <unistd.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <pwd.h> +#include <shadow.h> +#include <signal.h> +#include <time.h> +#include <sys/time.h> + +#include <security/_pam_types.h> +#include <security/_pam_macros.h> + +#include "passverify.h" + +static int +set_password(const char *forwho, const char *shadow, const char *remember) +{ + struct passwd *pwd = NULL; + int retval; + char pass[MAXPASS + 1]; + char towhat[MAXPASS + 1]; + int npass = 0; + /* we don't care about number format errors because the helper + should be called internally only */ + int doshadow = atoi(shadow); + int nremember = atoi(remember); + char *passwords[] = { pass, towhat }; + + /* read the password from stdin (a pipe from the pam_unix module) */ + + npass = read_passwords(STDIN_FILENO, 2, passwords); + + if (npass != 2) { /* is it a valid password? */ + if (npass == 1) { + helper_log_err(LOG_DEBUG, "no new password supplied"); + memset(pass, '\0', MAXPASS); + } else { + helper_log_err(LOG_DEBUG, "no valid passwords supplied"); + } + return PAM_AUTHTOK_ERR; + } + + if (lock_pwdf() != PAM_SUCCESS) + return PAM_AUTHTOK_LOCK_BUSY; + + pwd = getpwnam(forwho); + + if (pwd == NULL) { + retval = PAM_USER_UNKNOWN; + goto done; + } + + /* does pass agree with the official one? + we always allow change from null pass */ + retval = helper_verify_password(forwho, pass, 1); + if (retval != PAM_SUCCESS) { + goto done; + } + + /* first, save old password */ + if (save_old_password(forwho, pass, nremember)) { + retval = PAM_AUTHTOK_ERR; + goto done; + } + + if (doshadow || is_pwd_shadowed(pwd)) { + retval = unix_update_shadow(forwho, towhat); + if (retval == PAM_SUCCESS) + if (!is_pwd_shadowed(pwd)) + retval = unix_update_passwd(forwho, "x"); + } else { + retval = unix_update_passwd(forwho, towhat); + } + +done: + memset(pass, '\0', MAXPASS); + memset(towhat, '\0', MAXPASS); + + unlock_pwdf(); + + if (retval == PAM_SUCCESS) { + return PAM_SUCCESS; + } else { + return PAM_AUTHTOK_ERR; + } +} + +int main(int argc, char *argv[]) +{ + char *option; + + /* + * Catch or ignore as many signal as possible. + */ + setup_signals(); + + /* + * we establish that this program is running with non-tty stdin. + * this is to discourage casual use. It does *NOT* prevent an + * intruder from repeatadly running this program to determine the + * password of the current user (brute force attack, but one for + * which the attacker must already have gained access to the user's + * account). + */ + + if (isatty(STDIN_FILENO) || argc != 5 ) { + helper_log_err(LOG_NOTICE + ,"inappropriate use of Unix helper binary [UID=%d]" + ,getuid()); + fprintf(stderr + ,"This binary is not designed for running in this way\n" + "-- the system administrator has been informed\n"); + sleep(10); /* this should discourage/annoy the user */ + return PAM_SYSTEM_ERR; + } + + /* We must be root to read/update shadow. + */ + if (geteuid() != 0) { + return PAM_CRED_INSUFFICIENT; + } + + option = argv[2]; + + if (strcmp(option, "update") == 0) { + /* Attempting to change the password */ + return set_password(argv[1], argv[3], argv[4]); + } + + return PAM_SYSTEM_ERR; +} + +/* + * Copyright (c) Andrew G. Morgan, 1996. All rights reserved + * Copyright (c) Red Hat, Inc., 2007, 2008. All rights reserved + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, and the entire permission notice in its entirety, + * including the disclaimer of warranties. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * ALTERNATIVELY, this product may be distributed under the terms of + * the GNU Public License, in which case the provisions of the GPL are + * required INSTEAD OF the above restrictions. (This clause is + * necessary due to a potential bad interaction between the GPL and + * the restrictions contained in a BSD-style copyright.) + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + */ diff --git a/modules/pam_unix/yppasswd.h b/modules/pam_unix/yppasswd.h new file mode 100644 index 00000000..6b414be0 --- /dev/null +++ b/modules/pam_unix/yppasswd.h @@ -0,0 +1,51 @@ +/* + * yppasswdd + * Copyright 1994, 1995, 1996 Olaf Kirch, <okir@monad.swb.de> + * + * This program is covered by the GNU General Public License, version 2. + * It is provided in the hope that it is useful. However, the author + * disclaims ALL WARRANTIES, expressed or implied. See the GPL for details. + * + * This file was generated automatically by rpcgen from yppasswd.x, and + * editied manually. + */ + +#ifndef _YPPASSWD_H_ +#define _YPPASSWD_H_ + +#define YPPASSWDPROG ((u_long)100009) +#define YPPASSWDVERS ((u_long)1) +#define YPPASSWDPROC_UPDATE ((u_long)1) + +/* + * The password struct passed by the update call. I renamed it to + * xpasswd to avoid a type clash with the one defined in <pwd.h>. + */ +#ifndef __sgi +typedef struct xpasswd { + char *pw_name; + char *pw_passwd; + int pw_uid; + int pw_gid; + char *pw_gecos; + char *pw_dir; + char *pw_shell; +} xpasswd; + +#else +#include <pwd.h> +typedef struct xpasswd xpasswd; +#endif + +/* The updated password information, plus the old password. + */ +typedef struct yppasswd { + char *oldpass; + xpasswd newpw; +} yppasswd; + +/* XDR encoding/decoding routines */ +bool_t xdr_xpasswd(XDR * xdrs, xpasswd * objp); +bool_t xdr_yppasswd(XDR * xdrs, yppasswd * objp); + +#endif /* _YPPASSWD_H_ */ diff --git a/modules/pam_unix/yppasswd_xdr.c b/modules/pam_unix/yppasswd_xdr.c new file mode 100644 index 00000000..bf3f2fc6 --- /dev/null +++ b/modules/pam_unix/yppasswd_xdr.c @@ -0,0 +1,38 @@ +/* + * yppasswdd + * Copyright 1994, 1995, 1996 Olaf Kirch, <okir@monad.swb.de> + * + * This program is covered by the GNU General Public License, version 2. + * It is provided in the hope that it is useful. However, the author + * disclaims ALL WARRANTIES, expressed or implied. See the GPL for details. + * + * This file was generated automatically by rpcgen from yppasswd.x, and + * editied manually. + */ + +#include "config.h" + +#include <rpc/rpc.h> +#include <rpcsvc/yp_prot.h> +#include <rpcsvc/ypclnt.h> +#include "yppasswd.h" + +bool_t +xdr_xpasswd(XDR * xdrs, xpasswd * objp) +{ + return xdr_string(xdrs, &objp->pw_name, ~0) + && xdr_string(xdrs, &objp->pw_passwd, ~0) + && xdr_int(xdrs, &objp->pw_uid) + && xdr_int(xdrs, &objp->pw_gid) + && xdr_string(xdrs, &objp->pw_gecos, ~0) + && xdr_string(xdrs, &objp->pw_dir, ~0) + && xdr_string(xdrs, &objp->pw_shell, ~0); +} + + +bool_t +xdr_yppasswd(XDR * xdrs, yppasswd * objp) +{ + return xdr_string(xdrs, &objp->oldpass, ~0) + && xdr_xpasswd(xdrs, &objp->newpw); +} diff --git a/modules/pam_userdb/Makefile.am b/modules/pam_userdb/Makefile.am new file mode 100644 index 00000000..a442ef83 --- /dev/null +++ b/modules/pam_userdb/Makefile.am @@ -0,0 +1,34 @@ +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# 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install-strip installcheck \ + installcheck-am installdirs maintainer-clean \ + maintainer-clean-generic mostlyclean mostlyclean-compile \ + mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \ + tags uninstall uninstall-am uninstall-man uninstall-man8 \ + uninstall-securelibLTLIBRARIES + +@ENABLE_REGENERATE_MAN_TRUE@README: pam_userdb.8.xml +@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_userdb/README b/modules/pam_userdb/README new file mode 100644 index 00000000..8e1a5ffd --- /dev/null +++ b/modules/pam_userdb/README @@ -0,0 +1,74 @@ +pam_userdb — PAM module to authenticate against a db database + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +The pam_userdb module is used to verify a username/password pair against values +stored in a Berkeley DB database. The database is indexed by the username, and +the data fields corresponding to the username keys are the passwords. + +OPTIONS + +crypt=[crypt|none] + + Indicates whether encrypted or plaintext passwords are stored in the + database. If it is crypt, passwords should be stored in the database in + crypt(3) form. If none is selected, passwords should be stored in the + database as plaintext. + +db=/path/database + + Use the /path/database database for performing lookup. There is no default; + the module will return PAM_IGNORE if no database is provided. + +debug + + Print debug information. + +dump + + Dump all the entries in the database to the log. Don't do this by default! + +icase + + Make the password verification to be case insensitive (ie when working with + registration numbers and such). Only works with plaintext password storage. + +try_first_pass + + Use the authentication token previously obtained by another module that did + the conversation with the application. If this token can not be obtained + then the module will try to converse. This option can be used for stacking + different modules that need to deal with the authentication tokens. + +use_first_pass + + Use the authentication token previously obtained by another module that did + the conversation with the application. If this token can not be obtained + then the module will fail. This option can be used for stacking different + modules that need to deal with the authentication tokens. + +unknown_ok + + Do not return error when checking for a user that is not in the database. + This can be used to stack more than one pam_userdb module that will check a + username/password pair in more than a database. + +key_only + + The username and password are concatenated together in the database hash as + 'username-password' with a random value. if the concatenation of the + username and password with a dash in the middle returns any result, the + user is valid. this is useful in cases where the username may not be unique + but the username and password pair are. + +EXAMPLES + +auth sufficient pam_userdb.so icase db=/etc/dbtest.db + + +AUTHOR + +pam_userdb was written by Cristian Gafton >gafton@redhat.com<. + diff --git a/modules/pam_userdb/README.xml b/modules/pam_userdb/README.xml new file mode 100644 index 00000000..b22c09e7 --- /dev/null +++ b/modules/pam_userdb/README.xml @@ -0,0 +1,41 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_userdb.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_userdb.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_userdb-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_userdb.8.xml" xpointer='xpointer(//refsect1[@id = "pam_userdb-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_userdb.8.xml" xpointer='xpointer(//refsect1[@id = "pam_userdb-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_userdb.8.xml" xpointer='xpointer(//refsect1[@id = "pam_userdb-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_userdb.8.xml" xpointer='xpointer(//refsect1[@id = "pam_userdb-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_userdb/create.pl b/modules/pam_userdb/create.pl new file mode 100644 index 00000000..28088102 --- /dev/null +++ b/modules/pam_userdb/create.pl @@ -0,0 +1,23 @@ +#!/usr/bin/perl +# this program creates a database in ARGV[1] from pairs given on +# stdandard input +# +# $Id: create.pl,v 1.2 2004/09/28 13:48:47 kukuk Exp $ + +use DB_File; + +my $database = $ARGV[0]; +die "Use: create.pl <database>\n" unless ($database); +print "Using database: $database\n"; + +my %lusers = (); + +tie %lusers, 'DB_File', $database, O_RDWR|O_CREAT, 0644, $DB_HASH ; +while (<STDIN>) { + my ($user, $pass) = split; + + $lusers{$user} = $pass; +} +untie %lusers; + + diff --git a/modules/pam_userdb/pam_userdb.8 b/modules/pam_userdb/pam_userdb.8 new file mode 100644 index 00000000..86f83d7d --- /dev/null +++ b/modules/pam_userdb/pam_userdb.8 @@ -0,0 +1,136 @@ +.\" Title: pam_userdb +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_USERDB" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_userdb - PAM module to authenticate against a db database +.SH "SYNOPSIS" +.HP 14 +\fBpam_userdb\.so\fR db=\fI/path/database\fR [debug] [crypt=[crypt|none]] [icase] [dump] [try_first_pass] [use_first_pass] [unknown_ok] [key_only] +.SH "DESCRIPTION" +.PP +The pam_userdb module is used to verify a username/password pair against values stored in a Berkeley DB database\. The database is indexed by the username, and the data fields corresponding to the username keys are the passwords\. +.SH "OPTIONS" +.PP +\fBcrypt=[crypt|none]\fR +.RS 4 +Indicates whether encrypted or plaintext passwords are stored in the database\. If it is +\fBcrypt\fR, passwords should be stored in the database in +\fBcrypt\fR(3) +form\. If +\fBnone\fR +is selected, passwords should be stored in the database as plaintext\. +.RE +.PP +\fBdb=\fR\fB\fI/path/database\fR\fR +.RS 4 +Use the +\fI/path/database\fR +database for performing lookup\. There is no default; the module will return +\fBPAM_IGNORE\fR +if no database is provided\. +.RE +.PP +\fBdebug\fR +.RS 4 +Print debug information\. +.RE +.PP +\fBdump\fR +.RS 4 +Dump all the entries in the database to the log\. Don\'t do this by default! +.RE +.PP +\fBicase\fR +.RS 4 +Make the password verification to be case insensitive (ie when working with registration numbers and such)\. Only works with plaintext password storage\. +.RE +.PP +\fBtry_first_pass\fR +.RS 4 +Use the authentication token previously obtained by another module that did the conversation with the application\. If this token can not be obtained then the module will try to converse\. This option can be used for stacking different modules that need to deal with the authentication tokens\. +.RE +.PP +\fBuse_first_pass\fR +.RS 4 +Use the authentication token previously obtained by another module that did the conversation with the application\. If this token can not be obtained then the module will fail\. This option can be used for stacking different modules that need to deal with the authentication tokens\. +.RE +.PP +\fBunknown_ok\fR +.RS 4 +Do not return error when checking for a user that is not in the database\. This can be used to stack more than one pam_userdb module that will check a username/password pair in more than a database\. +.RE +.PP +\fBkey_only\fR +.RS 4 +The username and password are concatenated together in the database hash as \'username\-password\' with a random value\. if the concatenation of the username and password with a dash in the middle returns any result, the user is valid\. this is useful in cases where the username may not be unique but the username and password pair are\. +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +The services +\fBauth\fR +and +\fBaccount\fR +are supported\. +.SH "RETURN VALUES" +.PP +PAM_AUTH_ERR +.RS 4 +Authentication failure\. +.RE +.PP +PAM_AUTHTOK_RECOVERY_ERR +.RS 4 +Authentication information cannot be recovered\. +.RE +.PP +PAM_BUF_ERR +.RS 4 +Memory buffer error\. +.RE +.PP +PAM_CONV_ERR +.RS 4 +Conversation failure\. +.RE +.PP +PAM_SERVICE_ERR +.RS 4 +Error in service module\. +.RE +.PP +PAM_SUCCESS +.RS 4 +Success\. +.RE +.PP +PAM_USER_UNKNOWN +.RS 4 +User not known to the underlying authentication module\. +.RE +.SH "EXAMPLES" +.sp +.RS 4 +.nf +auth sufficient pam_userdb\.so icase db=/etc/dbtest\.db + +.fi +.RE +.SH "SEE ALSO" +.PP + +\fBcrypt\fR(3), +\fBpam.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_userdb was written by Cristian Gafton >gafton@redhat\.com<\. diff --git a/modules/pam_userdb/pam_userdb.8.xml b/modules/pam_userdb/pam_userdb.8.xml new file mode 100644 index 00000000..70b416b3 --- /dev/null +++ b/modules/pam_userdb/pam_userdb.8.xml @@ -0,0 +1,292 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_userdb"> + + <refmeta> + <refentrytitle>pam_userdb</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_userdb-name"> + <refname>pam_userdb</refname> + <refpurpose>PAM module to authenticate against a db database</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_userdb-cmdsynopsis"> + <command>pam_userdb.so</command> + <arg choice="plain"> + db=<replaceable>/path/database</replaceable> + </arg> + <arg choice="opt"> + debug + </arg> + <arg choice="opt"> + crypt=[crypt|none] + </arg> + <arg choice="opt"> + icase + </arg> + <arg choice="opt"> + dump + </arg> + <arg choice="opt"> + try_first_pass + </arg> + <arg choice="opt"> + use_first_pass + </arg> + <arg choice="opt"> + unknown_ok + </arg> + <arg choice="opt"> + key_only + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_userdb-description"> + + <title>DESCRIPTION</title> + + <para> + The pam_userdb module is used to verify a username/password pair + against values stored in a Berkeley DB database. The database is + indexed by the username, and the data fields corresponding to the + username keys are the passwords. + </para> + </refsect1> + + <refsect1 id="pam_userdb-options"> + + <title>OPTIONS</title> + <variablelist> + <varlistentry> + <term> + <option>crypt=[crypt|none]</option> + </term> + <listitem> + <para> + Indicates whether encrypted or plaintext passwords are stored + in the database. If it is <option>crypt</option>, passwords + should be stored in the database in + <citerefentry> + <refentrytitle>crypt</refentrytitle><manvolnum>3</manvolnum> + </citerefentry> form. If <option>none</option> is selected, + passwords should be stored in the database as plaintext. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>db=<replaceable>/path/database</replaceable></option> + </term> + <listitem> + <para> + Use the <filename>/path/database</filename> database for + performing lookup. There is no default; the module will + return <emphasis remap='B'>PAM_IGNORE</emphasis> if no + database is provided. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>debug</option> + </term> + <listitem> + <para> + Print debug information. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>dump</option> + </term> + <listitem> + <para> + Dump all the entries in the database to the log. + Don't do this by default! + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>icase</option> + </term> + <listitem> + <para> + Make the password verification to be case insensitive + (ie when working with registration numbers and such). + Only works with plaintext password storage. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>try_first_pass</option> + </term> + <listitem> + <para> + Use the authentication token previously obtained by + another module that did the conversation with the + application. If this token can not be obtained then + the module will try to converse. This option can + be used for stacking different modules that need to + deal with the authentication tokens. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>use_first_pass</option> + </term> + <listitem> + <para> + Use the authentication token previously obtained by + another module that did the conversation with the + application. If this token can not be obtained then + the module will fail. This option can be used for + stacking different modules that need to deal with + the authentication tokens. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>unknown_ok</option> + </term> + <listitem> + <para> + Do not return error when checking for a user that is + not in the database. This can be used to stack more + than one pam_userdb module that will check a + username/password pair in more than a database. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>key_only</option> + </term> + <listitem> + <para> + The username and password are concatenated together + in the database hash as 'username-password' with a + random value. if the concatenation of the username and + password with a dash in the middle returns any result, + the user is valid. this is useful in cases where + the username may not be unique but the username and + password pair are. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_userdb-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + The services <option>auth</option> and <option>account</option> + are supported. + </para> + </refsect1> + + <refsect1 id='pam_userdb-return_values'> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_AUTH_ERR</term> + <listitem> + <para>Authentication failure.</para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_AUTHTOK_RECOVERY_ERR</term> + <listitem> + <para> + Authentication information cannot be recovered. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_BUF_ERR</term> + <listitem> + <para> + Memory buffer error. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_CONV_ERR</term> + <listitem> + <para> + Conversation failure. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_SERVICE_ERR</term> + <listitem> + <para> + Error in service module. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + Success. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_USER_UNKNOWN</term> + <listitem> + <para> + User not known to the underlying authentication module. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id='pam_userdb-examples'> + <title>EXAMPLES</title> + <programlisting> +auth sufficient pam_userdb.so icase db=/etc/dbtest.db + </programlisting> + </refsect1> + + <refsect1 id='pam_userdb-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>crypt</refentrytitle><manvolnum>3</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_userdb-author'> + <title>AUTHOR</title> + <para> + pam_userdb was written by Cristian Gafton >gafton@redhat.com<. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_userdb/pam_userdb.c b/modules/pam_userdb/pam_userdb.c new file mode 100644 index 00000000..a796b15e --- /dev/null +++ b/modules/pam_userdb/pam_userdb.c @@ -0,0 +1,517 @@ +/* pam_userdb module */ + +/* + * Written by Cristian Gafton <gafton@redhat.com> 1996/09/10 + * See the end of the file for Copyright Information + */ + +#include "config.h" + +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <string.h> +#include <syslog.h> +#include <stdarg.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <errno.h> +#ifdef HAVE_CRYPT_H +#include <crypt.h> +#endif + +#include "pam_userdb.h" + +#ifdef HAVE_NDBM_H +# include <ndbm.h> +#else +# ifdef HAVE_DB_H +# define DB_DBM_HSEARCH 1 /* use the dbm interface */ +# include <db.h> +# else +# error "failed to find a libdb or equivalent" +# endif +#endif + +/* + * here, we make a definition for the externally accessible function + * in this file (this definition is required for static a module + * but strongly encouraged generally) it is used to instruct the + * modules include file to define the function prototypes. + */ + +#define PAM_SM_AUTH +#define PAM_SM_ACCOUNT + +#include <security/pam_modules.h> +#include <security/pam_ext.h> +#include <security/_pam_macros.h> + +/* + * Conversation function to obtain the user's password + */ +static int +obtain_authtok(pam_handle_t *pamh) +{ + char *resp; + const void *item; + int retval; + + retval = pam_prompt(pamh, PAM_PROMPT_ECHO_OFF, &resp, _("Password: ")); + + if (retval != PAM_SUCCESS) + return retval; + + if (resp == NULL) + return PAM_CONV_ERR; + + /* set the auth token */ + retval = pam_set_item(pamh, PAM_AUTHTOK, resp); + + /* clean it up */ + _pam_overwrite(resp); + _pam_drop(resp); + + if ( (retval != PAM_SUCCESS) || + (retval = pam_get_item(pamh, PAM_AUTHTOK, &item)) + != PAM_SUCCESS ) { + return retval; + } + + return retval; +} + +static int +_pam_parse (pam_handle_t *pamh, int argc, const char **argv, + const char **database, const char **cryptmode) +{ + int ctrl; + + *database = NULL; + *cryptmode = NULL; + + /* step through arguments */ + for (ctrl = 0; argc-- > 0; ++argv) + { + /* generic options */ + + if (!strcmp(*argv,"debug")) + ctrl |= PAM_DEBUG_ARG; + else if (!strcasecmp(*argv, "icase")) + ctrl |= PAM_ICASE_ARG; + else if (!strcasecmp(*argv, "dump")) + ctrl |= PAM_DUMP_ARG; + else if (!strcasecmp(*argv, "unknown_ok")) + ctrl |= PAM_UNKNOWN_OK_ARG; + else if (!strcasecmp(*argv, "key_only")) + ctrl |= PAM_KEY_ONLY_ARG; + else if (!strcasecmp(*argv, "use_first_pass")) + ctrl |= PAM_USE_FPASS_ARG; + else if (!strcasecmp(*argv, "try_first_pass")) + ctrl |= PAM_TRY_FPASS_ARG; + else if (!strncasecmp(*argv,"db=", 3)) + { + *database = (*argv) + 3; + if (**database == '\0') { + *database = NULL; + pam_syslog(pamh, LOG_ERR, + "db= specification missing argument - ignored"); + } + } + else if (!strncasecmp(*argv,"crypt=", 6)) + { + *cryptmode = (*argv) + 6; + if (**cryptmode == '\0') + pam_syslog(pamh, LOG_ERR, + "crypt= specification missing argument - ignored"); + } + else + { + pam_syslog(pamh, LOG_ERR, "unknown option: %s", *argv); + } + } + + return ctrl; +} + + +/* + * Looks up an user name in a database and checks the password + * + * return values: + * 1 = User not found + * 0 = OK + * -1 = Password incorrect + * -2 = System error + */ +static int +user_lookup (pam_handle_t *pamh, const char *database, const char *cryptmode, + const char *user, const char *pass, int ctrl) +{ + DBM *dbm; + datum key, data; + + /* Open the DB file. */ + dbm = dbm_open(database, O_RDONLY, 0644); + if (dbm == NULL) { + pam_syslog(pamh, LOG_ERR, + "user_lookup: could not open database `%s': %m", database); + return -2; + } + + /* dump out the database contents for debugging */ + if (ctrl & PAM_DUMP_ARG) { + pam_syslog(pamh, LOG_INFO, "Database dump:"); + for (key = dbm_firstkey(dbm); key.dptr != NULL; + key = dbm_nextkey(dbm)) { + data = dbm_fetch(dbm, key); + pam_syslog(pamh, LOG_INFO, + "key[len=%d] = `%s', data[len=%d] = `%s'", + key.dsize, key.dptr, data.dsize, data.dptr); + } + } + + /* do some more init work */ + memset(&key, 0, sizeof(key)); + memset(&data, 0, sizeof(data)); + if (ctrl & PAM_KEY_ONLY_ARG) { + if (asprintf(&key.dptr, "%s-%s", user, pass) < 0) + key.dptr = NULL; + else + key.dsize = strlen(key.dptr); + } else { + key.dptr = x_strdup(user); + key.dsize = strlen(user); + } + + if (key.dptr) { + data = dbm_fetch(dbm, key); + memset(key.dptr, 0, key.dsize); + free(key.dptr); + } + + if (ctrl & PAM_DEBUG_ARG) { + pam_syslog(pamh, LOG_INFO, + "password in database is [%p]`%.*s', len is %d", + data.dptr, data.dsize, (char *) data.dptr, data.dsize); + } + + if (data.dptr != NULL) { + int compare = 0; + + if (ctrl & PAM_KEY_ONLY_ARG) + { + dbm_close (dbm); + return 0; /* found it, data contents don't matter */ + } + + if (cryptmode && strncasecmp(cryptmode, "crypt", 5) == 0) { + + /* crypt(3) password storage */ + + char *cryptpw; + char salt[2]; + + if (data.dsize != 13) { + compare = -2; + } else if (ctrl & PAM_ICASE_ARG) { + compare = -2; + } else { + salt[0] = *data.dptr; + salt[1] = *(data.dptr + 1); + + cryptpw = crypt (pass, salt); + + if (cryptpw) { + compare = strncasecmp (data.dptr, cryptpw, data.dsize); + } else { + compare = -2; + if (ctrl & PAM_DEBUG_ARG) { + pam_syslog(pamh, LOG_INFO, "crypt() returned NULL"); + } + }; + + }; + + } else { + + /* Unknown password encryption method - + * default to plaintext password storage + */ + + if (strlen(pass) != (size_t)data.dsize) { + compare = 1; /* wrong password len -> wrong password */ + } else if (ctrl & PAM_ICASE_ARG) { + compare = strncasecmp(data.dptr, pass, data.dsize); + } else { + compare = strncmp(data.dptr, pass, data.dsize); + } + + if (cryptmode && strncasecmp(cryptmode, "none", 4) + && (ctrl & PAM_DEBUG_ARG)) { + pam_syslog(pamh, LOG_INFO, "invalid value for crypt parameter: %s", + cryptmode); + pam_syslog(pamh, LOG_INFO, "defaulting to plaintext password mode"); + } + + } + + dbm_close(dbm); + if (compare == 0) + return 0; /* match */ + else + return -1; /* wrong */ + } else { + int saw_user = 0; + + if (ctrl & PAM_DEBUG_ARG) { + pam_syslog(pamh, LOG_INFO, "error returned by dbm_fetch: %m"); + } + + /* probably we should check dbm_error() here */ + + if ((ctrl & PAM_KEY_ONLY_ARG) == 0) { + dbm_close(dbm); + return 1; /* not key_only, so no entry => no entry for the user */ + } + + /* now handle the key_only case */ + for (key = dbm_firstkey(dbm); + key.dptr != NULL; + key = dbm_nextkey(dbm)) { + int compare; + /* first compare the user portion (case sensitive) */ + compare = strncmp(key.dptr, user, strlen(user)); + if (compare == 0) { + /* assume failure */ + compare = -1; + /* if we have the divider where we expect it to be... */ + if (key.dptr[strlen(user)] == '-') { + saw_user = 1; + if ((size_t)key.dsize == strlen(user) + 1 + strlen(pass)) { + if (ctrl & PAM_ICASE_ARG) { + /* compare the password portion (case insensitive)*/ + compare = strncasecmp(key.dptr + strlen(user) + 1, + pass, + strlen(pass)); + } else { + /* compare the password portion (case sensitive) */ + compare = strncmp(key.dptr + strlen(user) + 1, + pass, + strlen(pass)); + } + } + } + if (compare == 0) { + dbm_close(dbm); + return 0; /* match */ + } + } + } + dbm_close(dbm); + if (saw_user) + return -1; /* saw the user, but password mismatch */ + else + return 1; /* not found */ + } + + /* NOT REACHED */ + return -2; +} + +/* --- authentication management functions (only) --- */ + +PAM_EXTERN int +pam_sm_authenticate(pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + const char *username; + const void *password; + const char *database = NULL; + const char *cryptmode = NULL; + int retval = PAM_AUTH_ERR, ctrl; + + /* parse arguments */ + ctrl = _pam_parse(pamh, argc, argv, &database, &cryptmode); + if (database == NULL) { + pam_syslog(pamh, LOG_ERR, "can not get the database name"); + return PAM_SERVICE_ERR; + } + + /* Get the username */ + retval = pam_get_user(pamh, &username, NULL); + if ((retval != PAM_SUCCESS) || (!username)) { + pam_syslog(pamh, LOG_ERR, "can not get the username"); + return PAM_SERVICE_ERR; + } + + if ((ctrl & PAM_USE_FPASS_ARG) == 0 && (ctrl & PAM_TRY_FPASS_ARG) == 0) { + /* Converse to obtain a password */ + retval = obtain_authtok(pamh); + if (retval != PAM_SUCCESS) { + pam_syslog(pamh, LOG_ERR, "can not obtain password from user"); + return retval; + } + } + + /* Check if we got a password */ + retval = pam_get_item(pamh, PAM_AUTHTOK, &password); + if (retval != PAM_SUCCESS || password == NULL) { + if ((ctrl & PAM_TRY_FPASS_ARG) != 0) { + /* Converse to obtain a password */ + retval = obtain_authtok(pamh); + if (retval != PAM_SUCCESS) { + pam_syslog(pamh, LOG_ERR, "can not obtain password from user"); + return retval; + } + retval = pam_get_item(pamh, PAM_AUTHTOK, &password); + } + if (retval != PAM_SUCCESS || password == NULL) { + pam_syslog(pamh, LOG_ERR, "can not recover user password"); + return PAM_AUTHTOK_RECOVERY_ERR; + } + } + + if (ctrl & PAM_DEBUG_ARG) + pam_syslog(pamh, LOG_INFO, "Verify user `%s' with a password", + username); + + /* Now use the username to look up password in the database file */ + retval = user_lookup(pamh, database, cryptmode, username, password, ctrl); + switch (retval) { + case -2: + /* some sort of system error. The log was already printed */ + return PAM_SERVICE_ERR; + case -1: + /* incorrect password */ + pam_syslog(pamh, LOG_WARNING, + "user `%s' denied access (incorrect password)", + username); + return PAM_AUTH_ERR; + case 1: + /* the user does not exist in the database */ + if (ctrl & PAM_DEBUG_ARG) + pam_syslog(pamh, LOG_NOTICE, + "user `%s' not found in the database", username); + return PAM_USER_UNKNOWN; + case 0: + /* Otherwise, the authentication looked good */ + pam_syslog(pamh, LOG_NOTICE, "user '%s' granted access", username); + return PAM_SUCCESS; + default: + /* we don't know anything about this return value */ + pam_syslog(pamh, LOG_ERR, + "internal module error (retval = %d, user = `%s'", + retval, username); + return PAM_SERVICE_ERR; + } + + /* should not be reached */ + return PAM_IGNORE; +} + +PAM_EXTERN int +pam_sm_setcred(pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_SUCCESS; +} + +PAM_EXTERN int +pam_sm_acct_mgmt(pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + const char *username; + const char *database = NULL; + const char *cryptmode = NULL; + int retval = PAM_AUTH_ERR, ctrl; + + /* parse arguments */ + ctrl = _pam_parse(pamh, argc, argv, &database, &cryptmode); + + /* Get the username */ + retval = pam_get_user(pamh, &username, NULL); + if ((retval != PAM_SUCCESS) || (!username)) { + pam_syslog(pamh, LOG_ERR,"can not get the username"); + return PAM_SERVICE_ERR; + } + + /* Now use the username to look up password in the database file */ + retval = user_lookup(pamh, database, cryptmode, username, "", ctrl); + switch (retval) { + case -2: + /* some sort of system error. The log was already printed */ + return PAM_SERVICE_ERR; + case -1: + /* incorrect password, but we don't care */ + /* FALL THROUGH */ + case 0: + /* authentication succeeded. dumbest password ever. */ + return PAM_SUCCESS; + case 1: + /* the user does not exist in the database */ + return PAM_USER_UNKNOWN; + default: + /* we don't know anything about this return value */ + pam_syslog(pamh, LOG_ERR, + "internal module error (retval = %d, user = `%s'", + retval, username); + return PAM_SERVICE_ERR; + } + + return PAM_SUCCESS; +} + + +#ifdef PAM_STATIC + +/* static module data */ + +struct pam_module _pam_userdb_modstruct = { + "pam_userdb", + pam_sm_authenticate, + pam_sm_setcred, + pam_sm_acct_mgmt, + NULL, + NULL, + NULL, +}; + +#endif + +/* + * Copyright (c) Cristian Gafton <gafton@redhat.com>, 1999 + * All rights reserved + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, and the entire permission notice in its entirety, + * including the disclaimer of warranties. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * ALTERNATIVELY, this product may be distributed under the terms of + * the GNU Public License, in which case the provisions of the GPL are + * required INSTEAD OF the above restrictions. (This clause is + * necessary due to a potential bad interaction between the GPL and + * the restrictions contained in a BSD-style copyright.) + * + * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + */ diff --git a/modules/pam_userdb/pam_userdb.h b/modules/pam_userdb/pam_userdb.h new file mode 100644 index 00000000..5a3396a2 --- /dev/null +++ b/modules/pam_userdb/pam_userdb.h @@ -0,0 +1,62 @@ + +#ifndef _PAM_USERSDB_H +#define _PAM_USERSDB_H +/* $Id: pam_userdb.h,v 1.4 2005/09/18 13:04:57 kukuk Exp $ */ + +/* Header files */ +#include <security/pam_appl.h> + +/* argument parsing */ +#define PAM_DEBUG_ARG 0x0001 +#define PAM_ICASE_ARG 0x0002 +#define PAM_DUMP_ARG 0x0004 +#define PAM_UNKNOWN_OK_ARG 0x0010 +#define PAM_KEY_ONLY_ARG 0x0020 +#define PAM_USE_FPASS_ARG 0x0040 +#define PAM_TRY_FPASS_ARG 0x0080 + +/* Useful macros */ +#define x_strdup(s) ( (s) ? strdup(s):NULL ) + +/* The name of the module we are compiling */ +#ifndef MODULE_NAME +#define MODULE_NAME "pam_userdb" +#endif /* MODULE_NAME */ + +#endif /* _PAM_USERSDB_H */ + +/* + * Copyright (c) Cristian Gafton <gafton@redhat.com>, 1999 + * All rights reserved + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, and the entire permission notice in its entirety, + * including the disclaimer of warranties. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * ALTERNATIVELY, this product may be distributed under the terms of + * the GNU Public License, in which case the provisions of the GPL are + * required INSTEAD OF the above restrictions. (This clause is + * necessary due to a potential bad interaction between the GPL and + * the restrictions contained in a BSD-style copyright.) + * + * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + */ diff --git a/modules/pam_userdb/tst-pam_userdb b/modules/pam_userdb/tst-pam_userdb new file mode 100755 index 00000000..5d5eb195 --- /dev/null +++ b/modules/pam_userdb/tst-pam_userdb @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_userdb.so diff --git a/modules/pam_warn/Makefile.am b/modules/pam_warn/Makefile.am new file mode 100644 index 00000000..6ecc1362 --- /dev/null +++ b/modules/pam_warn/Makefile.am @@ -0,0 +1,31 @@ +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README $(MANS) $(XMLS) tst-pam_warn + +man_MANS = pam_warn.8 +XMLS = README.xml pam_warn.8.xml + +TESTS = tst-pam_warn + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include +AM_LDFLAGS = -no-undefined -avoid-version -module \ + -L$(top_builddir)/libpam -lpam +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_warn.la + +if ENABLE_REGENERATE_MAN +noinst_DATA = README +README: pam_warn.8.xml +-include $(top_srcdir)/Make.xml.rules +endif + diff --git a/modules/pam_warn/Makefile.in b/modules/pam_warn/Makefile.in new file mode 100644 index 00000000..73a5b463 --- /dev/null +++ b/modules/pam_warn/Makefile.in @@ -0,0 +1,667 @@ +# Makefile.in generated by automake 1.10.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY, to the extent permitted by law; without +# even the implied warranty of MERCHANTABILITY or FITNESS FOR A +# PARTICULAR PURPOSE. + +@SET_MAKE@ + +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + + +VPATH = @srcdir@ +pkgdatadir = $(datadir)/@PACKAGE@ +pkglibdir = $(libdir)/@PACKAGE@ +pkgincludedir = $(includedir)/@PACKAGE@ +am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd +install_sh_DATA = $(install_sh) -c -m 644 +install_sh_PROGRAM = $(install_sh) -c +install_sh_SCRIPT = $(install_sh) -c +INSTALL_HEADER = $(INSTALL_DATA) +transform = $(program_transform_name) +NORMAL_INSTALL = : +PRE_INSTALL = : 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$(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_warn/README b/modules/pam_warn/README new file mode 100644 index 00000000..a0713173 --- /dev/null +++ b/modules/pam_warn/README @@ -0,0 +1,36 @@ +pam_warn — PAM module which logs all PAM items if called + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +pam_warn is a PAM module that logs the service, terminal, user, remote user and +remote host to syslog(3). The items are not probed for, but instead obtained +from the standard PAM items. The module always returns PAM_IGNORE, indicating +that it does not want to affect the authentication process. + +OPTIONS + +This module does not recognise any options. + +EXAMPLES + +#%PAM-1.0 +# +# If we don't have config entries for a service, the +# OTHER entries are used. To be secure, warn and deny +# access to everything. +other auth required pam_warn.so +other auth required pam_deny.so +other account required pam_warn.so +other account required pam_deny.so +other password required pam_warn.so +other password required pam_deny.so +other session required pam_warn.so +other session required pam_deny.so + + +AUTHOR + +pam_warn was written by Andrew G. Morgan <morgan@kernel.org>. + diff --git a/modules/pam_warn/README.xml b/modules/pam_warn/README.xml new file mode 100644 index 00000000..4367c28f --- /dev/null +++ b/modules/pam_warn/README.xml @@ -0,0 +1,41 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_warn.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_warn.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_warn-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_warn.8.xml" xpointer='xpointer(//refsect1[@id = "pam_warn-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_warn.8.xml" xpointer='xpointer(//refsect1[@id = "pam_warn-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_warn.8.xml" xpointer='xpointer(//refsect1[@id = "pam_warn-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_warn.8.xml" xpointer='xpointer(//refsect1[@id = "pam_warn-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_warn/pam_warn.8 b/modules/pam_warn/pam_warn.8 new file mode 100644 index 00000000..66a3ca84 --- /dev/null +++ b/modules/pam_warn/pam_warn.8 @@ -0,0 +1,69 @@ +.\" Title: pam_warn +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_WARN" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_warn - PAM module which logs all PAM items if called +.SH "SYNOPSIS" +.HP 12 +\fBpam_warn\.so\fR +.SH "DESCRIPTION" +.PP +pam_warn is a PAM module that logs the service, terminal, user, remote user and remote host to +\fBsyslog\fR(3)\. The items are not probed for, but instead obtained from the standard PAM items\. The module always returns +\fBPAM_IGNORE\fR, indicating that it does not want to affect the authentication process\. +.SH "OPTIONS" +.PP +This module does not recognise any options\. +.SH "MODULE SERVICES PROVIDED" +.PP +The services +\fBauth\fR, +\fBaccount\fR, +\fBpassword\fR +and +\fBsession\fR +are supported\. +.SH "RETURN VALUES" +.PP +PAM_IGNORE +.RS 4 +This module always returns PAM_IGNORE\. +.RE +.SH "EXAMPLES" +.sp +.RS 4 +.nf +#%PAM\-1\.0 +# +# If we don\'t have config entries for a service, the +# OTHER entries are used\. To be secure, warn and deny +# access to everything\. +other auth required pam_warn\.so +other auth required pam_deny\.so +other account required pam_warn\.so +other account required pam_deny\.so +other password required pam_warn\.so +other password required pam_deny\.so +other session required pam_warn\.so +other session required pam_deny\.so + +.fi +.RE +.SH "SEE ALSO" +.PP + +\fBpam.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_warn was written by Andrew G\. Morgan <morgan@kernel\.org>\. diff --git a/modules/pam_warn/pam_warn.8.xml b/modules/pam_warn/pam_warn.8.xml new file mode 100644 index 00000000..b3261b86 --- /dev/null +++ b/modules/pam_warn/pam_warn.8.xml @@ -0,0 +1,104 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_warn"> + + <refmeta> + <refentrytitle>pam_warn</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + <refnamediv id="pam_warn-name"> + <refname>pam_warn</refname> + <refpurpose>PAM module which logs all PAM items if called</refpurpose> + </refnamediv> + <refsynopsisdiv> + <cmdsynopsis id="pam_warn-cmdsynopsis"> + <command>pam_warn.so</command> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_warn-description"> + <title>DESCRIPTION</title> + <para> + pam_warn is a PAM module that logs the service, terminal, user, + remote user and remote host to + <citerefentry> + <refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum> + </citerefentry>. The items are not probed for, but instead obtained + from the standard PAM items. The module always returns + <emphasis remap='B'>PAM_IGNORE</emphasis>, indicating that it + does not want to affect the authentication process. + </para> + </refsect1> + + <refsect1 id="pam_warn-options"> + <title>OPTIONS</title> + <para>This module does not recognise any options.</para> + </refsect1> + + <refsect1 id="pam_warn-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + The services <option>auth</option>, <option>account</option>, + <option>password</option> and <option>session</option> are supported. + </para> + </refsect1> + + <refsect1 id='pam_warn-return_values'> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_IGNORE</term> + <listitem> + <para> + This module always returns PAM_IGNORE. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id='pam_warn-examples'> + <title>EXAMPLES</title> + <programlisting> +#%PAM-1.0 +# +# If we don't have config entries for a service, the +# OTHER entries are used. To be secure, warn and deny +# access to everything. +other auth required pam_warn.so +other auth required pam_deny.so +other account required pam_warn.so +other account required pam_deny.so +other password required pam_warn.so +other password required pam_deny.so +other session required pam_warn.so +other session required pam_deny.so + </programlisting> + </refsect1> + + <refsect1 id='pam_warn-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_warn-author'> + <title>AUTHOR</title> + <para> + pam_warn was written by Andrew G. Morgan <morgan@kernel.org>. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_warn/pam_warn.c b/modules/pam_warn/pam_warn.c new file mode 100644 index 00000000..8c3b9d69 --- /dev/null +++ b/modules/pam_warn/pam_warn.c @@ -0,0 +1,123 @@ +/* pam_warn module */ + +/* + * $Id: pam_warn.c,v 1.6 2005/09/17 08:59:04 t8m Exp $ + * + * Written by Andrew Morgan <morgan@linux.kernel.org> 1996/3/11 + */ + +#include "config.h" + +#include <stdio.h> +#include <unistd.h> +#include <syslog.h> +#include <stdarg.h> + +/* + * here, we make a definition for the externally accessible function + * in this file (this definition is required for static a module + * but strongly encouraged generally) it is used to instruct the + * modules include file to define the function prototypes. + */ + +#define PAM_SM_AUTH +#define PAM_SM_PASSWORD + +#include <security/pam_modules.h> +#include <security/pam_ext.h> + +/* some syslogging */ + +#define OBTAIN(item, value, default_value) do { \ + (void) pam_get_item(pamh, item, &value); \ + value = value ? value : default_value ; \ +} while (0) + +static void log_items(pam_handle_t *pamh, const char *function) +{ + const void *service=NULL, *user=NULL, *terminal=NULL, + *rhost=NULL, *ruser=NULL; + + OBTAIN(PAM_SERVICE, service, "<unknown>"); + OBTAIN(PAM_TTY, terminal, "<unknown>"); + OBTAIN(PAM_USER, user, "<unknown>"); + OBTAIN(PAM_RUSER, ruser, "<unknown>"); + OBTAIN(PAM_RHOST, rhost, "<unknown>"); + + pam_syslog(pamh, LOG_NOTICE, + "function=[%s] service=[%s] terminal=[%s] user=[%s]" + " ruser=[%s] rhost=[%s]\n", function, + (const char *) service, (const char *) terminal, + (const char *) user, (const char *) ruser, + (const char *) rhost); +} + +/* --- authentication management functions (only) --- */ + +PAM_EXTERN +int pam_sm_authenticate(pam_handle_t *pamh, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + log_items(pamh, __FUNCTION__); + return PAM_IGNORE; +} + +PAM_EXTERN +int pam_sm_setcred(pam_handle_t *pamh, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + log_items(pamh, __FUNCTION__); + return PAM_IGNORE; +} + +/* password updating functions */ + +PAM_EXTERN +int pam_sm_chauthtok(pam_handle_t *pamh, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + log_items(pamh, __FUNCTION__); + return PAM_IGNORE; +} + +PAM_EXTERN int +pam_sm_acct_mgmt(pam_handle_t *pamh, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + log_items(pamh, __FUNCTION__); + return PAM_IGNORE; +} + +PAM_EXTERN int +pam_sm_open_session(pam_handle_t *pamh, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + log_items(pamh, __FUNCTION__); + return PAM_IGNORE; +} + +PAM_EXTERN int +pam_sm_close_session(pam_handle_t *pamh, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + log_items(pamh, __FUNCTION__); + return PAM_IGNORE; +} + +#ifdef PAM_STATIC + +/* static module data */ + +struct pam_module _pam_warn_modstruct = { + "pam_warn", + pam_sm_authenticate, + pam_sm_setcred, + pam_sm_acct_mgmt, + pam_sm_open_session, + pam_sm_close_session, + pam_sm_chauthtok, +}; + +#endif + +/* end of module definition */ diff --git a/modules/pam_warn/tst-pam_warn b/modules/pam_warn/tst-pam_warn new file mode 100755 index 00000000..0b48365a --- /dev/null +++ b/modules/pam_warn/tst-pam_warn @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_warn.so diff --git a/modules/pam_wheel/Makefile.am b/modules/pam_wheel/Makefile.am new file mode 100644 index 00000000..82a98305 --- /dev/null +++ b/modules/pam_wheel/Makefile.am @@ -0,0 +1,31 @@ +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README ${MANS} $(XMLS) tst-pam_wheel + +man_MANS = pam_wheel.8 +XMLS = README.xml pam_wheel.8.xml + +TESTS = tst-pam_wheel + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include +AM_LDFLAGS = -no-undefined 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00000000..6a2b21c5 --- /dev/null +++ b/modules/pam_wheel/README @@ -0,0 +1,61 @@ +pam_wheel — Only permit root access to members of group wheel + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +The pam_wheel PAM module is used to enforce the so-called wheel group. By +default it permits root access to the system if the applicant user is a member +of the wheel group. If no group with this name exist, the module is using the +group with the group-ID 0. + +OPTIONS + +debug + + Print debug information. + +deny + + Reverse the sense of the auth operation: if the user is trying to get UID 0 + access and is a member of the wheel group (or the group of the group + option), deny access. Conversely, if the user is not in the group, return + PAM_IGNORE (unless trust was also specified, in which case we return + PAM_SUCCESS). + +group=name + + Instead of checking the wheel or GID 0 groups, use the name group to + perform the authentication. + +root_only + + The check for wheel membership is done only. + +trust + + The pam_wheel module will return PAM_SUCCESS instead of PAM_IGNORE if the + user is a member of the wheel group (thus with a little play stacking the + modules the wheel members may be able to su to root without being prompted + for a passwd). + +use_uid + + The check for wheel membership will be done against the current uid instead + of the original one (useful when jumping with su from one account to + another for example). + +EXAMPLES + +The root account gains access by default (rootok), only wheel members can +become root (wheel) but Unix authenticate non-root applicants. + +su auth sufficient pam_rootok.so +su auth required pam_wheel.so +su auth required pam_unix.so + + +AUTHOR + +pam_wheel was written by Cristian Gafton <gafton@redhat.com>. + diff --git a/modules/pam_wheel/README.xml b/modules/pam_wheel/README.xml new file mode 100644 index 00000000..9e33d7ff --- /dev/null +++ b/modules/pam_wheel/README.xml @@ -0,0 +1,41 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_wheel.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_wheel.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_wheel-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_wheel.8.xml" xpointer='xpointer(//refsect1[@id = "pam_wheel-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_wheel.8.xml" xpointer='xpointer(//refsect1[@id = "pam_wheel-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_wheel.8.xml" xpointer='xpointer(//refsect1[@id = "pam_wheel-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_wheel.8.xml" xpointer='xpointer(//refsect1[@id = "pam_wheel-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_wheel/pam_wheel.8 b/modules/pam_wheel/pam_wheel.8 new file mode 100644 index 00000000..f1c63dac --- /dev/null +++ b/modules/pam_wheel/pam_wheel.8 @@ -0,0 +1,127 @@ +.\" Title: pam_wheel +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_WHEEL" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_wheel - Only permit root access to members of group wheel +.SH "SYNOPSIS" +.HP 13 +\fBpam_wheel\.so\fR [debug] [deny] [group=\fIname\fR] [root_only] [trust] [use_uid] +.SH "DESCRIPTION" +.PP +The pam_wheel PAM module is used to enforce the so\-called +\fIwheel\fR +group\. By default it permits root access to the system if the applicant user is a member of the +\fIwheel\fR +group\. If no group with this name exist, the module is using the group with the group\-ID +\fB0\fR\. +.SH "OPTIONS" +.PP +\fBdebug\fR +.RS 4 +Print debug information\. +.RE +.PP +\fBdeny\fR +.RS 4 +Reverse the sense of the auth operation: if the user is trying to get UID 0 access and is a member of the wheel group (or the group of the +\fBgroup\fR +option), deny access\. Conversely, if the user is not in the group, return PAM_IGNORE (unless +\fBtrust\fR +was also specified, in which case we return PAM_SUCCESS)\. +.RE +.PP +\fBgroup=\fR\fB\fIname\fR\fR +.RS 4 +Instead of checking the wheel or GID 0 groups, use the +\fB\fIname\fR\fR +group to perform the authentication\. +.RE +.PP +\fBroot_only\fR +.RS 4 +The check for wheel membership is done only\. +.RE +.PP +\fBtrust\fR +.RS 4 +The pam_wheel module will return PAM_SUCCESS instead of PAM_IGNORE if the user is a member of the wheel group (thus with a little play stacking the modules the wheel members may be able to su to root without being prompted for a passwd)\. +.RE +.PP +\fBuse_uid\fR +.RS 4 +The check for wheel membership will be done against the current uid instead of the original one (useful when jumping with su from one account to another for example)\. +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +The +\fBauth\fR +and +\fBaccount\fR +services are supported\. +.SH "RETURN VALUES" +.PP +PAM_AUTH_ERR +.RS 4 +Authentication failure\. +.RE +.PP +PAM_BUF_ERR +.RS 4 +Memory buffer error\. +.RE +.PP +PAM_IGNORE +.RS 4 +The return value should be ignored by PAM dispatch\. +.RE +.PP +PAM_PERM_DENY +.RS 4 +Permission denied\. +.RE +.PP +PAM_SERVICE_ERR +.RS 4 +Cannot determine the user name\. +.RE +.PP +PAM_SUCCESS +.RS 4 +Success\. +.RE +.PP +PAM_USER_UNKNOWN +.RS 4 +User not known\. +.RE +.SH "EXAMPLES" +.PP +The root account gains access by default (rootok), only wheel members can become root (wheel) but Unix authenticate non\-root applicants\. +.sp +.RS 4 +.nf +su auth sufficient pam_rootok\.so +su auth required pam_wheel\.so +su auth required pam_unix\.so + +.fi +.RE +.sp +.SH "SEE ALSO" +.PP + +\fBpam.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_wheel was written by Cristian Gafton <gafton@redhat\.com>\. diff --git a/modules/pam_wheel/pam_wheel.8.xml b/modules/pam_wheel/pam_wheel.8.xml new file mode 100644 index 00000000..bf8b7349 --- /dev/null +++ b/modules/pam_wheel/pam_wheel.8.xml @@ -0,0 +1,242 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_wheel"> + + <refmeta> + <refentrytitle>pam_wheel</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_wheel-name"> + <refname>pam_wheel</refname> + <refpurpose>Only permit root access to members of group wheel</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_wheel-cmdsynopsis"> + <command>pam_wheel.so</command> + <arg choice="opt"> + debug + </arg> + <arg choice="opt"> + deny + </arg> + <arg choice="opt"> + group=<replaceable>name</replaceable> + </arg> + <arg choice="opt"> + root_only + </arg> + <arg choice="opt"> + trust + </arg> + <arg choice="opt"> + use_uid + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_wheel-description"> + <title>DESCRIPTION</title> + <para> + The pam_wheel PAM module is used to enforce the so-called + <emphasis>wheel</emphasis> group. By default it permits root + access to the system if the applicant user is a member of the + <emphasis>wheel</emphasis> group. If no group with this name exist, + the module is using the group with the group-ID + <emphasis remap='B'>0</emphasis>. + </para> + </refsect1> + + <refsect1 id="pam_wheel-options"> + <title>OPTIONS</title> + <variablelist> + <varlistentry> + <term> + <option>debug</option> + </term> + <listitem> + <para> + Print debug information. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>deny</option> + </term> + <listitem> + <para> + Reverse the sense of the auth operation: if the user + is trying to get UID 0 access and is a member of the + wheel group (or the group of the <option>group</option> option), + deny access. Conversely, if the user is not in the group, return + PAM_IGNORE (unless <option>trust</option> was also specified, + in which case we return PAM_SUCCESS). + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>group=<replaceable>name</replaceable></option> + </term> + <listitem> + <para> + Instead of checking the wheel or GID 0 groups, use + the <option><replaceable>name</replaceable></option> group + to perform the authentication. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>root_only</option> + </term> + <listitem> + <para> + The check for wheel membership is done only. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>trust</option> + </term> + <listitem> + <para> + The pam_wheel module will return PAM_SUCCESS instead + of PAM_IGNORE if the user is a member of the wheel group + (thus with a little play stacking the modules the wheel + members may be able to su to root without being prompted + for a passwd). + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>use_uid</option> + </term> + <listitem> + <para> + The check for wheel membership will be done against + the current uid instead of the original one (useful when + jumping with su from one account to another for example). + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_wheel-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + The <emphasis remap='B'>auth</emphasis> and + <emphasis remap='B'>account</emphasis> services are supported. + </para> + </refsect1> + + <refsect1 id='pam_wheel-return_values'> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_AUTH_ERR</term> + <listitem> + <para> + Authentication failure. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_BUF_ERR</term> + <listitem> + <para> + Memory buffer error. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_IGNORE</term> + <listitem> + <para> + The return value should be ignored by PAM dispatch. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_PERM_DENY</term> + <listitem> + <para> + Permission denied. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_SERVICE_ERR</term> + <listitem> + <para> + Cannot determine the user name. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + Success. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_USER_UNKNOWN</term> + <listitem> + <para> + User not known. + </para> + </listitem> + </varlistentry> + + </variablelist> + </refsect1> + + <refsect1 id='pam_wheel-examples'> + <title>EXAMPLES</title> + <para> + The root account gains access by default (rootok), only wheel + members can become root (wheel) but Unix authenticate non-root + applicants. + <programlisting> +su auth sufficient pam_rootok.so +su auth required pam_wheel.so +su auth required pam_unix.so + </programlisting> + </para> + </refsect1> + + <refsect1 id='pam_wheel-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_wheel-author'> + <title>AUTHOR</title> + <para> + pam_wheel was written by Cristian Gafton <gafton@redhat.com>. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_wheel/pam_wheel.c b/modules/pam_wheel/pam_wheel.c new file mode 100644 index 00000000..d7d8096e --- /dev/null +++ b/modules/pam_wheel/pam_wheel.c @@ -0,0 +1,316 @@ +/* pam_wheel module */ + +/* + * Written by Cristian Gafton <gafton@redhat.com> 1996/09/10 + * See the end of the file for Copyright Information + * + * + * 1.2 - added 'deny' and 'group=' options + * 1.1 - added 'trust' option + * 1.0 - the code is working for at least another person, so... :-) + * 0.1 - use vsyslog instead of vfprintf/syslog in _pam_log + * - return PAM_IGNORE on success (take care of sloppy sysadmins..) + * - use pam_get_user instead of pam_get_item(...,PAM_USER,...) + * - a new arg use_uid to auth the current uid instead of the + * initial (logged in) one. + * 0.0 - first release + * + * TODO: + * - try to use make_remark from pam_unix/support.c + * - consider returning on failure PAM_FAIL_NOW if the user is not + * a wheel member. + */ + +#include "config.h" + +#include <stdio.h> +#include <unistd.h> +#include <string.h> +#include <syslog.h> +#include <stdarg.h> +#include <sys/types.h> +#include <pwd.h> +#include <grp.h> + +/* + * here, we make a definition for the externally accessible function + * in this file (this definition is required for static a module + * but strongly encouraged generally) it is used to instruct the + * modules include file to define the function prototypes. + */ + +#define PAM_SM_AUTH +#define PAM_SM_ACCOUNT + +#include <security/pam_modules.h> +#include <security/pam_modutil.h> +#include <security/pam_ext.h> + +/* checks if a user is on a list of members of the GID 0 group */ +static int is_on_list(char * const *list, const char *member) +{ + while (list && *list) { + if (strcmp(*list, member) == 0) + return 1; + list++; + } + return 0; +} + +/* argument parsing */ + +#define PAM_DEBUG_ARG 0x0001 +#define PAM_USE_UID_ARG 0x0002 +#define PAM_TRUST_ARG 0x0004 +#define PAM_DENY_ARG 0x0010 +#define PAM_ROOT_ONLY_ARG 0x0020 + +static int +_pam_parse (const pam_handle_t *pamh, int argc, const char **argv, + char *use_group, size_t group_length) +{ + int ctrl=0; + + memset(use_group, '\0', group_length); + + /* step through arguments */ + for (ctrl=0; argc-- > 0; ++argv) { + + /* generic options */ + + if (!strcmp(*argv,"debug")) + ctrl |= PAM_DEBUG_ARG; + else if (!strcmp(*argv,"use_uid")) + ctrl |= PAM_USE_UID_ARG; + else if (!strcmp(*argv,"trust")) + ctrl |= PAM_TRUST_ARG; + else if (!strcmp(*argv,"deny")) + ctrl |= PAM_DENY_ARG; + else if (!strcmp(*argv,"root_only")) + ctrl |= PAM_ROOT_ONLY_ARG; + else if (!strncmp(*argv,"group=",6)) + strncpy(use_group,*argv+6,group_length-1); + else { + pam_syslog(pamh, LOG_ERR, "unknown option: %s", *argv); + } + } + + return ctrl; +} + +static int +perform_check (pam_handle_t *pamh, int ctrl, const char *use_group) +{ + const char *username = NULL; + const char *fromsu; + struct passwd *pwd, *tpwd = NULL; + struct group *grp; + int retval = PAM_AUTH_ERR; + + retval = pam_get_user(pamh, &username, NULL); + if ((retval != PAM_SUCCESS) || (!username)) { + if (ctrl & PAM_DEBUG_ARG) { + pam_syslog(pamh, LOG_DEBUG, "can not get the username"); + } + return PAM_SERVICE_ERR; + } + + pwd = pam_modutil_getpwnam (pamh, username); + if (!pwd) { + if (ctrl & PAM_DEBUG_ARG) { + pam_syslog(pamh, LOG_NOTICE, "unknown user %s", username); + } + return PAM_USER_UNKNOWN; + } + if (ctrl & PAM_ROOT_ONLY_ARG) { + /* su to a non uid 0 account ? */ + if (pwd->pw_uid != 0) { + return PAM_IGNORE; + } + } + + if (ctrl & PAM_USE_UID_ARG) { + tpwd = pam_modutil_getpwuid (pamh, getuid()); + if (!tpwd) { + if (ctrl & PAM_DEBUG_ARG) { + pam_syslog(pamh, LOG_NOTICE, "who is running me ?!"); + } + return PAM_SERVICE_ERR; + } + fromsu = tpwd->pw_name; + } else { + fromsu = pam_modutil_getlogin(pamh); + if (fromsu) { + tpwd = pam_modutil_getpwnam (pamh, fromsu); + } + if (!fromsu || !tpwd) { + if (ctrl & PAM_DEBUG_ARG) { + pam_syslog(pamh, LOG_NOTICE, "who is running me ?!"); + } + return PAM_SERVICE_ERR; + } + } + + /* + * At this point fromsu = username-of-invoker; tpwd = pwd ptr for fromsu + */ + + if (!use_group[0]) { + if ((grp = pam_modutil_getgrnam (pamh, "wheel")) == NULL) { + grp = pam_modutil_getgrgid (pamh, 0); + } + } else { + grp = pam_modutil_getgrnam (pamh, use_group); + } + + if (!grp || (!grp->gr_mem && (tpwd->pw_gid != grp->gr_gid))) { + if (ctrl & PAM_DEBUG_ARG) { + if (!use_group[0]) { + pam_syslog(pamh, LOG_NOTICE, "no members in a GID 0 group"); + } else { + pam_syslog(pamh, LOG_NOTICE, + "no members in '%s' group", use_group); + } + } + if (ctrl & PAM_DENY_ARG) { + /* if this was meant to deny access to the members + * of this group and the group does not exist, allow + * access + */ + return PAM_IGNORE; + } else { + return PAM_AUTH_ERR; + } + } + + /* + * test if the user is a member of the group, or if the + * user has the "wheel" (sic) group as its primary group. + */ + + if (is_on_list(grp->gr_mem, fromsu) || (tpwd->pw_gid == grp->gr_gid)) { + + if (ctrl & PAM_DENY_ARG) { + retval = PAM_PERM_DENIED; + + } else if (ctrl & PAM_TRUST_ARG) { + retval = PAM_SUCCESS; /* this can be a sufficient check */ + + } else { + retval = PAM_IGNORE; + } + + } else { + + if (ctrl & PAM_DENY_ARG) { + + if (ctrl & PAM_TRUST_ARG) { + retval = PAM_SUCCESS; /* this can be a sufficient check */ + } else { + retval = PAM_IGNORE; + } + + } else { + retval = PAM_PERM_DENIED; + } + } + + if (ctrl & PAM_DEBUG_ARG) { + if (retval == PAM_IGNORE) { + pam_syslog(pamh, LOG_NOTICE, + "Ignoring access request '%s' for '%s'", + fromsu, username); + } else { + pam_syslog(pamh, LOG_NOTICE, "Access %s to '%s' for '%s'", + (retval != PAM_SUCCESS) ? "denied":"granted", + fromsu, username); + } + } + + return retval; +} + +/* --- authentication management functions --- */ + +PAM_EXTERN int +pam_sm_authenticate (pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + char use_group[BUFSIZ]; + int ctrl; + + ctrl = _pam_parse(pamh, argc, argv, use_group, sizeof(use_group)); + + return perform_check(pamh, ctrl, use_group); +} + +PAM_EXTERN int +pam_sm_setcred (pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_SUCCESS; +} + +PAM_EXTERN int +pam_sm_acct_mgmt (pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + char use_group[BUFSIZ]; + int ctrl; + + ctrl = _pam_parse(pamh, argc, argv, use_group, sizeof(use_group)); + + return perform_check(pamh, ctrl, use_group); +} + +#ifdef PAM_STATIC + +/* static module data */ + +struct pam_module _pam_wheel_modstruct = { + "pam_wheel", + pam_sm_authenticate, + pam_sm_setcred, + pam_sm_acct_mgmt, + NULL, + NULL, + NULL +}; + +#endif /* PAM_STATIC */ + +/* + * Copyright (c) Cristian Gafton <gafton@redhat.com>, 1996, 1997 + * All rights reserved + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, and the entire permission notice in its entirety, + * including the disclaimer of warranties. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * ALTERNATIVELY, this product may be distributed under the terms of + * the GNU Public License, in which case the provisions of the GPL are + * required INSTEAD OF the above restrictions. (This clause is + * necessary due to a potential bad interaction between the GPL and + * the restrictions contained in a BSD-style copyright.) + * + * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + */ diff --git a/modules/pam_wheel/tst-pam_wheel b/modules/pam_wheel/tst-pam_wheel new file mode 100755 index 00000000..4bf5d6a6 --- /dev/null +++ b/modules/pam_wheel/tst-pam_wheel @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_wheel.so diff --git a/modules/pam_xauth/Makefile.am b/modules/pam_xauth/Makefile.am new file mode 100644 index 00000000..8f1d56b0 --- /dev/null +++ b/modules/pam_xauth/Makefile.am @@ -0,0 +1,31 @@ +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ + +EXTRA_DIST = README ${MANS} $(XMLS) tst-pam_xauth + +man_MANS = pam_xauth.8 +XMLS = README.xml pam_xauth.8.xml + +TESTS = tst-pam_xauth + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include +AM_LDFLAGS = -no-undefined -avoid-version -module \ + -L$(top_builddir)/libpam -lpam +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_xauth.la + +if ENABLE_REGENERATE_MAN +noinst_DATA = README +README: pam_xauth.8.xml +-include $(top_srcdir)/Make.xml.rules +endif + diff --git a/modules/pam_xauth/Makefile.in b/modules/pam_xauth/Makefile.in new file mode 100644 index 00000000..1c315ee6 --- /dev/null +++ b/modules/pam_xauth/Makefile.in @@ -0,0 +1,667 @@ +# Makefile.in generated by automake 1.10.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY, to the extent permitted by law; without +# even the implied warranty of MERCHANTABILITY or FITNESS FOR A +# PARTICULAR PURPOSE. + +@SET_MAKE@ + +# +# Copyright (c) 2005, 2006 Thorsten Kukuk <kukuk@suse.de> +# + + +VPATH = @srcdir@ +pkgdatadir = $(datadir)/@PACKAGE@ +pkglibdir = $(libdir)/@PACKAGE@ +pkgincludedir = $(includedir)/@PACKAGE@ +am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd +install_sh_DATA = $(install_sh) -c -m 644 +install_sh_PROGRAM = $(install_sh) -c +install_sh_SCRIPT = $(install_sh) -c +INSTALL_HEADER = $(INSTALL_DATA) +transform = $(program_transform_name) +NORMAL_INSTALL = : +PRE_INSTALL = : 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$(top_srcdir)/Make.xml.rules +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/modules/pam_xauth/README b/modules/pam_xauth/README new file mode 100644 index 00000000..4e0e3ec4 --- /dev/null +++ b/modules/pam_xauth/README @@ -0,0 +1,90 @@ +pam_xauth — PAM module to forward xauth keys between users + +â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â”â” + +DESCRIPTION + +The pam_xauth PAM module is designed to forward xauth keys (sometimes referred +to as "cookies") between users. + +Without pam_xauth, when xauth is enabled and a user uses the su(1) command to +assume another user's priviledges, that user is no longer able to access the +original user's X display because the new user does not have the key needed to +access the display. pam_xauth solves the problem by forwarding the key from the +user running su (the source user) to the user whose identity the source user is +assuming (the target user) when the session is created, and destroying the key +when the session is torn down. + +This means, for example, that when you run su(1) from an xterm sesssion, you +will be able to run X programs without explicitly dealing with the xauth(1) +xauth command or ~/.Xauthority files. + +pam_xauth will only forward keys if xauth can list a key connected to the +$DISPLAY environment variable. + +Primitive access control is provided by ~/.xauth/export in the invoking user's +home directory and ~/.xauth/import in the target user's home directory. + +If a user has a ~/.xauth/import file, the user will only receive cookies from +users listed in the file. If there is no ~/.xauth/import file, the user will +accept cookies from any other user. + +If a user has a .xauth/export file, the user will only forward cookies to users +listed in the file. If there is no ~/.xauth/export file, and the invoking user +is not root, the user will forward cookies to any other user. If there is no ~ +/.xauth/export file, and the invoking user is root, the user will not forward +cookies to other users. + +Both the import and export files support wildcards (such as *). Both the import +and export files can be empty, signifying that no users are allowed. + +OPTIONS + +debug + + Print debug information. + +xauthpath=/path/to/xauth + + Specify the path the xauth program (it is expected in /usr/X11R6/bin/xauth, + /usr/bin/xauth, or /usr/bin/X11/xauth by default). + +systemuser=UID + + Specify the highest UID which will be assumed to belong to a "system" user. + pam_xauth will refuse to forward credentials to users with UID less than or + equal to this number, except for root and the "targetuser", if specified. + +targetuser=UID + + Specify a single target UID which is exempt from the systemuser check. + +EXAMPLES + +Add the following line to /etc/pam.d/su to forward xauth keys between users +when calling su: + +session optional pam_xauth.so + + +IMPLEMENTATION DETAILS + +pam_xauth will work only if it is used from a setuid application in which the +getuid() call returns the id of the user running the application, and for which +PAM can supply the name of the account that the user is attempting to assume. +The typical application of this type is su(1). The application must call both +pam_open_session() and pam_close_session() with the ruid set to the uid of the +calling user and the euid set to root, and must have provided as the PAM_USER +item the name of the target user. + +pam_xauth calls xauth(1) as the source user to extract the key for $DISPLAY, +then calls xauth as the target user to merge the key into the a temporary +database and later remove the database. + +pam_xauth cannot be told to not remove the keys when the session is closed. + +AUTHOR + +pam_xauth was written by Nalin Dahyabhai <nalin@redhat.com>, based on original +version by Michael K. Johnson <johnsonm@redhat.com>. + diff --git a/modules/pam_xauth/README.xml b/modules/pam_xauth/README.xml new file mode 100644 index 00000000..adefbd98 --- /dev/null +++ b/modules/pam_xauth/README.xml @@ -0,0 +1,46 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" +"http://www.docbook.org/xml/4.3/docbookx.dtd" +[ +<!-- +<!ENTITY pamaccess SYSTEM "pam_xauth.8.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_xauth.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_xauth-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_xauth.8.xml" xpointer='xpointer(//refsect1[@id = "pam_xauth-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_xauth.8.xml" xpointer='xpointer(//refsect1[@id = "pam_xauth-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_xauth.8.xml" xpointer='xpointer(//refsect1[@id = "pam_xauth-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_xauth.8.xml" xpointer='xpointer(//refsect1[@id = "pam_xauth-implementation"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_xauth.8.xml" xpointer='xpointer(//refsect1[@id = "pam_xauth-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_xauth/pam_xauth.8 b/modules/pam_xauth/pam_xauth.8 new file mode 100644 index 00000000..0793ce93 --- /dev/null +++ b/modules/pam_xauth/pam_xauth.8 @@ -0,0 +1,163 @@ +.\" Title: pam_xauth +.\" Author: +.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/> +.\" Date: 04/16/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_XAUTH" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.SH "NAME" +pam_xauth - PAM module to forward xauth keys between users +.SH "SYNOPSIS" +.HP 13 +\fBpam_xauth\.so\fR [debug] [xauthpath=\fI/path/to/xauth\fR] [systemuser=\fIUID\fR] [targetuser=\fIUID\fR] +.SH "DESCRIPTION" +.PP +The pam_xauth PAM module is designed to forward xauth keys (sometimes referred to as "cookies") between users\. +.PP +Without pam_xauth, when xauth is enabled and a user uses the +\fBsu\fR(1) +command to assume another user\'s priviledges, that user is no longer able to access the original user\'s X display because the new user does not have the key needed to access the display\. pam_xauth solves the problem by forwarding the key from the user running su (the source user) to the user whose identity the source user is assuming (the target user) when the session is created, and destroying the key when the session is torn down\. +.PP +This means, for example, that when you run +\fBsu\fR(1) +from an xterm sesssion, you will be able to run X programs without explicitly dealing with the +\fBxauth\fR(1) +xauth command or ~/\.Xauthority files\. +.PP +pam_xauth will only forward keys if xauth can list a key connected to the $DISPLAY environment variable\. +.PP +Primitive access control is provided by +\fI~/\.xauth/export\fR +in the invoking user\'s home directory and +\fI~/\.xauth/import\fR +in the target user\'s home directory\. +.PP +If a user has a +\fI~/\.xauth/import\fR +file, the user will only receive cookies from users listed in the file\. If there is no +\fI~/\.xauth/import\fR +file, the user will accept cookies from any other user\. +.PP +If a user has a +\fI\.xauth/export\fR +file, the user will only forward cookies to users listed in the file\. If there is no +\fI~/\.xauth/export\fR +file, and the invoking user is not +\fBroot\fR, the user will forward cookies to any other user\. If there is no +\fI~/\.xauth/export\fR +file, and the invoking user is +\fBroot\fR, the user will +\fInot\fR +forward cookies to other users\. +.PP +Both the import and export files support wildcards (such as +\fI*\fR)\. Both the import and export files can be empty, signifying that no users are allowed\. +.SH "OPTIONS" +.PP +\fBdebug\fR +.RS 4 +Print debug information\. +.RE +.PP +\fBxauthpath=\fR\fB\fI/path/to/xauth\fR\fR +.RS 4 +Specify the path the xauth program (it is expected in +\fI/usr/X11R6/bin/xauth\fR, +\fI/usr/bin/xauth\fR, or +\fI/usr/bin/X11/xauth\fR +by default)\. +.RE +.PP +\fBsystemuser=\fR\fB\fIUID\fR\fR +.RS 4 +Specify the highest UID which will be assumed to belong to a "system" user\. pam_xauth will refuse to forward credentials to users with UID less than or equal to this number, except for root and the "targetuser", if specified\. +.RE +.PP +\fBtargetuser=\fR\fB\fIUID\fR\fR +.RS 4 +Specify a single target UID which is exempt from the systemuser check\. +.RE +.SH "MODULE SERVICES PROVIDED" +.PP +Only the +\fBsession\fR +service is supported\. +.SH "RETURN VALUES" +.PP +PAM_BUF_ERR +.RS 4 +Memory buffer error\. +.RE +.PP +PAM_PERM_DENIED +.RS 4 +Permission denied by import/export file\. +.RE +.PP +PAM_SESSION_ERR +.RS 4 +Cannot determine user name, UID or access users home directory\. +.RE +.PP +PAM_SUCCESS +.RS 4 +Success\. +.RE +.PP +PAM_USER_UNKNOWN +.RS 4 +User not known\. +.RE +.SH "EXAMPLES" +.PP +Add the following line to +\fI/etc/pam\.d/su\fR +to forward xauth keys between users when calling su: +.sp +.RS 4 +.nf +session optional pam_xauth\.so + +.fi +.RE +.sp +.SH "IMPLEMENTATION DETAILS" +.PP +pam_xauth will work +\fIonly\fR +if it is used from a setuid application in which the +\fBgetuid\fR() call returns the id of the user running the application, and for which PAM can supply the name of the account that the user is attempting to assume\. The typical application of this type is +\fBsu\fR(1)\. The application must call both +\fBpam_open_session\fR() and +\fBpam_close_session\fR() with the ruid set to the uid of the calling user and the euid set to root, and must have provided as the PAM_USER item the name of the target user\. +.PP +pam_xauth calls +\fBxauth\fR(1) +as the source user to extract the key for $DISPLAY, then calls xauth as the target user to merge the key into the a temporary database and later remove the database\. +.PP +pam_xauth cannot be told to not remove the keys when the session is closed\. +.SH "FILES" +.PP +\fI~/\.xauth/import\fR +.RS 4 +XXX +.RE +.PP +\fI~/\.xauth/export\fR +.RS 4 +XXX +.RE +.SH "SEE ALSO" +.PP + +\fBpam.conf\fR(5), +\fBpam.d\fR(8), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_xauth was written by Nalin Dahyabhai <nalin@redhat\.com>, based on original version by Michael K\. Johnson <johnsonm@redhat\.com>\. diff --git a/modules/pam_xauth/pam_xauth.8.xml b/modules/pam_xauth/pam_xauth.8.xml new file mode 100644 index 00000000..f6323f26 --- /dev/null +++ b/modules/pam_xauth/pam_xauth.8.xml @@ -0,0 +1,293 @@ +<?xml version="1.0" encoding='UTF-8'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" + "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<refentry id="pam_xauth"> + + <refmeta> + <refentrytitle>pam_xauth</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_xauth-name"> + <refname>pam_xauth</refname> + <refpurpose>PAM module to forward xauth keys between users</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_xauth-cmdsynopsis"> + <command>pam_xauth.so</command> + <arg choice="opt"> + debug + </arg> + <arg choice="opt"> + xauthpath=<replaceable>/path/to/xauth</replaceable> + </arg> + <arg choice="opt"> + systemuser=<replaceable>UID</replaceable> + </arg> + <arg choice="opt"> + targetuser=<replaceable>UID</replaceable> + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_xauth-description"> + <title>DESCRIPTION</title> + <para> + The pam_xauth PAM module is designed to forward xauth keys + (sometimes referred to as "cookies") between users. + </para> + <para> + Without pam_xauth, when xauth is enabled and a user uses the + <citerefentry> + <refentrytitle>su</refentrytitle><manvolnum>1</manvolnum> + </citerefentry> command to assume another user's priviledges, + that user is no longer able to access the original user's X display + because the new user does not have the key needed to access the + display. pam_xauth solves the problem by forwarding the key from + the user running su (the source user) to the user whose identity the + source user is assuming (the target user) when the session is created, + and destroying the key when the session is torn down. + </para> + <para> + This means, for example, that when you run + <citerefentry> + <refentrytitle>su</refentrytitle><manvolnum>1</manvolnum> + </citerefentry> from an xterm sesssion, you will be able to run + X programs without explicitly dealing with the + <citerefentry> + <refentrytitle>xauth</refentrytitle><manvolnum>1</manvolnum> + </citerefentry> xauth command or ~/.Xauthority files. + </para> + <para> + pam_xauth will only forward keys if xauth can list a key connected + to the $DISPLAY environment variable. + </para> + <para> + Primitive access control is provided by + <filename>~/.xauth/export</filename> in the invoking user's home + directory and <filename>~/.xauth/import</filename> in the target + user's home directory. + </para> + <para> + If a user has a <filename>~/.xauth/import</filename> file, the user + will only receive cookies from users listed in the file. If there is + no <filename>~/.xauth/import</filename> file, the user will accept + cookies from any other user. + </para> + <para> + If a user has a <filename>.xauth/export</filename> file, the user will + only forward cookies to users listed in the file. If there is no + <filename>~/.xauth/export</filename> file, and the invoking user is + not <emphasis remap='B'>root</emphasis>, the user will forward cookies + to any other user. If there is no <filename>~/.xauth/export</filename> + file, and the invoking user is <emphasis remap='B'>root</emphasis>, + the user will <emphasis remap='I'>not</emphasis> forward cookies to + other users. + </para> + <para> + Both the import and export files support wildcards (such as + <emphasis remap='I'>*</emphasis>). Both the import and export files + can be empty, signifying that no users are allowed. + </para> + </refsect1> + + <refsect1 id="pam_xauth-options"> + <title>OPTIONS</title> + <variablelist> + <varlistentry> + <term> + <option>debug</option> + </term> + <listitem> + <para> + Print debug information. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>xauthpath=<replaceable>/path/to/xauth</replaceable></option> + </term> + <listitem> + <para> + Specify the path the xauth program (it is expected in + <filename>/usr/X11R6/bin/xauth</filename>, + <filename>/usr/bin/xauth</filename>, or + <filename>/usr/bin/X11/xauth</filename> by default). + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>systemuser=<replaceable>UID</replaceable></option> + </term> + <listitem> + <para> + Specify the highest UID which will be assumed to belong to a + "system" user. pam_xauth will refuse to forward credentials to + users with UID less than or equal to this number, except for + root and the "targetuser", if specified. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>targetuser=<replaceable>UID</replaceable></option> + </term> + <listitem> + <para> + Specify a single target UID which is exempt from the + systemuser check. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_xauth-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + Only the <emphasis remap='B'>session</emphasis> service is supported. + </para> + </refsect1> + + <refsect1 id='pam_xauth-return_values'> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_BUF_ERR</term> + <listitem> + <para> + Memory buffer error. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_PERM_DENIED</term> + <listitem> + <para> + Permission denied by import/export file. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_SESSION_ERR</term> + <listitem> + <para> + Cannot determine user name, UID or access users home directory. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + Success. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_USER_UNKNOWN</term> + <listitem> + <para> + User not known. + </para> + </listitem> + </varlistentry> + + </variablelist> + </refsect1> + + <refsect1 id='pam_xauth-examples'> + <title>EXAMPLES</title> + <para> + Add the following line to <filename>/etc/pam.d/su</filename> to + forward xauth keys between users when calling su: + <programlisting> +session optional pam_xauth.so + </programlisting> + </para> + </refsect1> + + <refsect1 id="pam_xauth-implementation"> + <title>IMPLEMENTATION DETAILS</title> + <para> + pam_xauth will work <emphasis remap='I'>only</emphasis> if it is + used from a setuid application in which the + <function>getuid</function>() call returns the id of the user + running the application, and for which PAM can supply the name + of the account that the user is attempting to assume. The typical + application of this type is + <citerefentry> + <refentrytitle>su</refentrytitle><manvolnum>1</manvolnum> + </citerefentry>. + The application must call both <function>pam_open_session</function>() + and <function>pam_close_session</function>() with the ruid set to the + uid of the calling user and the euid set to root, and must have + provided as the PAM_USER item the name of the target user. + </para> + <para> + pam_xauth calls + <citerefentry> + <refentrytitle>xauth</refentrytitle><manvolnum>1</manvolnum> + </citerefentry> as the source user to extract the key for $DISPLAY, + then calls xauth as the target user to merge the key into the a + temporary database and later remove the database. + </para> + <para> + pam_xauth cannot be told to not remove the keys when the session + is closed. + </para> + </refsect1> + + <refsect1 id="pam_lastlog-files"> + <title>FILES</title> + <variablelist> + <varlistentry> + <term><filename>~/.xauth/import</filename></term> + <listitem> + <para>XXX</para> + </listitem> + </varlistentry> + <varlistentry> + <term><filename>~/.xauth/export</filename></term> + <listitem> + <para>XXX</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + + <refsect1 id='pam_xauth-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_xauth-author'> + <title>AUTHOR</title> + <para> + pam_xauth was written by Nalin Dahyabhai <nalin@redhat.com>, + based on original version by + Michael K. Johnson <johnsonm@redhat.com>. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_xauth/pam_xauth.c b/modules/pam_xauth/pam_xauth.c new file mode 100644 index 00000000..1135d4b7 --- /dev/null +++ b/modules/pam_xauth/pam_xauth.c @@ -0,0 +1,686 @@ +/* + * Copyright 2001-2003 Red Hat, Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, and the entire permission notice in its entirety, + * including the disclaimer of warranties. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * ALTERNATIVELY, this product may be distributed under the terms of + * the GNU Public License, in which case the provisions of the GPL are + * required INSTEAD OF the above restrictions. (This clause is + * necessary due to a potential bad interaction between the GPL and + * the restrictions contained in a BSD-style copyright.) + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include "config.h" +#include <sys/types.h> +#include <sys/fsuid.h> +#include <sys/wait.h> +#include <errno.h> +#include <fnmatch.h> +#include <grp.h> +#include <limits.h> +#include <netdb.h> +#include <pwd.h> +#include <stdarg.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <syslog.h> +#include <unistd.h> + +#define PAM_SM_SESSION + +#include <security/pam_modules.h> +#include <security/_pam_macros.h> +#include <security/pam_modutil.h> +#include <security/pam_ext.h> + +#define DATANAME "pam_xauth_cookie_file" +#define XAUTHENV "XAUTHORITY" +#define HOMEENV "HOME" +#define XAUTHDEF ".Xauthority" +#define XAUTHTMP ".xauthXXXXXX" + +/* Hurd compatibility */ +#ifndef PATH_MAX +#define PATH_MAX 4096 +#endif + +/* Possible paths to xauth executable */ +static const char * const xauthpaths[] = { +#ifdef PAM_PATH_XAUTH + PAM_PATH_XAUTH, +#endif + "/usr/X11R6/bin/xauth", + "/usr/bin/xauth", + "/usr/bin/X11/xauth" +}; + +/* Run a given command (with a NULL-terminated argument list), feeding it the + * given input on stdin, and storing any output it generates. */ +static int +run_coprocess(const char *input, char **output, + uid_t uid, gid_t gid, const char *command, ...) +{ + int ipipe[2], opipe[2], i; + char buf[LINE_MAX]; + pid_t child; + char *buffer = NULL; + size_t buffer_size = 0; + va_list ap; + + *output = NULL; + + /* Create stdio pipery. */ + if (pipe(ipipe) == -1) { + return -1; + } + if (pipe(opipe) == -1) { + close(ipipe[0]); + close(ipipe[1]); + return -1; + } + + /* Fork off a child. */ + child = fork(); + if (child == -1) { + close(ipipe[0]); + close(ipipe[1]); + close(opipe[0]); + close(opipe[1]); + return -1; + } + + if (child == 0) { + /* We're the child. */ + size_t j; + char *args[10]; + const char *tmp; + /* Drop privileges. */ + setgid(gid); + setgroups(0, NULL); + setuid(uid); + /* Initialize the argument list. */ + memset(args, 0, sizeof(args)); + /* Set the pipe descriptors up as stdin and stdout, and close + * everything else, including the original values for the + * descriptors. */ + dup2(ipipe[0], STDIN_FILENO); + dup2(opipe[1], STDOUT_FILENO); + for (i = 0; i < sysconf(_SC_OPEN_MAX); i++) { + if ((i != STDIN_FILENO) && (i != STDOUT_FILENO)) { + close(i); + } + } + /* Convert the varargs list into a regular array of strings. */ + va_start(ap, command); + args[0] = strdup(command); + for (j = 1; j < ((sizeof(args) / sizeof(args[0])) - 1); j++) { + tmp = va_arg(ap, const char*); + if (tmp == NULL) { + break; + } + args[j] = strdup(tmp); + } + /* Run the command. */ + execv(command, args); + /* Never reached. */ + exit(1); + } + + /* We're the parent, so close the other ends of the pipes. */ + close(ipipe[0]); + close(opipe[1]); + /* Send input to the process (if we have any), then send an EOF. */ + if (input) { + (void)pam_modutil_write(ipipe[1], input, strlen(input)); + } + close(ipipe[1]); + + /* Read data output until we run out of stuff to read. */ + i = pam_modutil_read(opipe[0], buf, sizeof(buf)); + while ((i != 0) && (i != -1)) { + char *tmp; + /* Resize the buffer to hold the data. */ + tmp = realloc(buffer, buffer_size + i + 1); + if (tmp == NULL) { + /* Uh-oh, bail. */ + if (buffer != NULL) { + free(buffer); + } + close(opipe[0]); + waitpid(child, NULL, 0); + return -1; + } + /* Save the new buffer location, copy the newly-read data into + * the buffer, and make sure the result will be + * nul-terminated. */ + buffer = tmp; + memcpy(buffer + buffer_size, buf, i); + buffer[buffer_size + i] = '\0'; + buffer_size += i; + /* Try to read again. */ + i = pam_modutil_read(opipe[0], buf, sizeof(buf)); + } + /* No more data. Clean up and return data. */ + close(opipe[0]); + *output = buffer; + waitpid(child, NULL, 0); + return 0; +} + +/* Free a data item. */ +static void +cleanup (pam_handle_t *pamh UNUSED, void *data, int err UNUSED) +{ + free (data); +} + +/* Check if we want to allow export to the other user, or import from the + * other user. */ +static int +check_acl(pam_handle_t *pamh, + const char *sense, const char *this_user, const char *other_user, + int noent_code, int debug) +{ + char path[PATH_MAX]; + struct passwd *pwd; + FILE *fp; + int i; + uid_t euid; + /* Check this user's <sense> file. */ + pwd = pam_modutil_getpwnam(pamh, this_user); + if (pwd == NULL) { + pam_syslog(pamh, LOG_ERR, + "error determining home directory for '%s'", + this_user); + return PAM_SESSION_ERR; + } + /* Figure out what that file is really named. */ + i = snprintf(path, sizeof(path), "%s/.xauth/%s", pwd->pw_dir, sense); + if ((i >= (int)sizeof(path)) || (i < 0)) { + pam_syslog(pamh, LOG_ERR, + "name of user's home directory is too long"); + return PAM_SESSION_ERR; + } + euid = geteuid(); + setfsuid(pwd->pw_uid); + fp = fopen(path, "r"); + setfsuid(euid); + if (fp != NULL) { + char buf[LINE_MAX], *tmp; + /* Scan the file for a list of specs of users to "trust". */ + while (fgets(buf, sizeof(buf), fp) != NULL) { + tmp = memchr(buf, '\r', sizeof(buf)); + if (tmp != NULL) { + *tmp = '\0'; + } + tmp = memchr(buf, '\n', sizeof(buf)); + if (tmp != NULL) { + *tmp = '\0'; + } + if (fnmatch(buf, other_user, 0) == 0) { + if (debug) { + pam_syslog(pamh, LOG_DEBUG, + "%s %s allowed by %s", + other_user, sense, path); + } + fclose(fp); + return PAM_SUCCESS; + } + } + /* If there's no match in the file, we fail. */ + if (debug) { + pam_syslog(pamh, LOG_DEBUG, "%s not listed in %s", + other_user, path); + } + fclose(fp); + return PAM_PERM_DENIED; + } else { + /* Default to okay if the file doesn't exist. */ + switch (errno) { + case ENOENT: + if (noent_code == PAM_SUCCESS) { + if (debug) { + pam_syslog(pamh, LOG_DEBUG, + "%s does not exist, ignoring", + path); + } + } else { + if (debug) { + pam_syslog(pamh, LOG_DEBUG, + "%s does not exist, failing", + path); + } + } + return noent_code; + default: + if (debug) { + pam_syslog(pamh, LOG_ERR, + "error opening %s: %m", path); + } + return PAM_PERM_DENIED; + } + } +} + +int +pam_sm_open_session (pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + char *cookiefile = NULL, *xauthority = NULL, + *cookie = NULL, *display = NULL, *tmp = NULL; + const char *user, *xauth = NULL; + struct passwd *tpwd, *rpwd; + int fd, i, debug = 0; + int retval = PAM_SUCCESS; + uid_t systemuser = 499, targetuser = 0, euid; + + /* Parse arguments. We don't understand many, so no sense in breaking + * this into a separate function. */ + for (i = 0; i < argc; i++) { + if (strcmp(argv[i], "debug") == 0) { + debug = 1; + continue; + } + if (strncmp(argv[i], "xauthpath=", 10) == 0) { + xauth = argv[i] + 10; + continue; + } + if (strncmp(argv[i], "targetuser=", 11) == 0) { + long l = strtol(argv[i] + 11, &tmp, 10); + if ((strlen(argv[i] + 11) > 0) && (*tmp == '\0')) { + targetuser = l; + } else { + pam_syslog(pamh, LOG_WARNING, + "invalid value for targetuser (`%s')", + argv[i] + 11); + } + continue; + } + if (strncmp(argv[i], "systemuser=", 11) == 0) { + long l = strtol(argv[i] + 11, &tmp, 10); + if ((strlen(argv[i] + 11) > 0) && (*tmp == '\0')) { + systemuser = l; + } else { + pam_syslog(pamh, LOG_WARNING, + "invalid value for systemuser (`%s')", + argv[i] + 11); + } + continue; + } + pam_syslog(pamh, LOG_WARNING, "unrecognized option `%s'", + argv[i]); + } + + if (xauth == NULL) { + size_t j; + for (j = 0; j < sizeof(xauthpaths)/sizeof(xauthpaths[0]); j++) { + if (access(xauthpaths[j], X_OK) == 0) { + xauth = xauthpaths[j]; + break; + } + } + if (xauth == NULL) { + /* xauth executable not found - nothing to do */ + return PAM_SUCCESS; + } + } + + /* If DISPLAY isn't set, we don't really care, now do we? */ + if ((display = getenv("DISPLAY")) == NULL) { + if (debug) { + pam_syslog(pamh, LOG_DEBUG, + "user has no DISPLAY, doing nothing"); + } + return PAM_SUCCESS; + } + + /* Read the target user's name. */ + if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS) { + pam_syslog(pamh, LOG_ERR, + "error determining target user's name"); + retval = PAM_SESSION_ERR; + goto cleanup; + } + rpwd = pam_modutil_getpwuid(pamh, getuid()); + if (rpwd == NULL) { + pam_syslog(pamh, LOG_ERR, + "error determining invoking user's name"); + retval = PAM_SESSION_ERR; + goto cleanup; + } + + /* Get the target user's UID and primary GID, which we'll need to set + * on the xauthority file we create later on. */ + tpwd = pam_modutil_getpwnam(pamh, user); + if (tpwd == NULL) { + pam_syslog(pamh, LOG_ERR, + "error determining target user's UID"); + retval = PAM_SESSION_ERR; + goto cleanup; + } + + if (debug) { + pam_syslog(pamh, LOG_DEBUG, + "requesting user %lu/%lu, target user %lu/%lu", + (unsigned long) rpwd->pw_uid, + (unsigned long) rpwd->pw_gid, + (unsigned long) tpwd->pw_uid, + (unsigned long) tpwd->pw_gid); + } + + /* If the UID is a system account (and not the superuser), forget + * about forwarding keys. */ + if ((tpwd->pw_uid != 0) && + (tpwd->pw_uid != targetuser) && + (tpwd->pw_uid <= systemuser)) { + if (debug) { + pam_syslog(pamh, LOG_DEBUG, + "not forwarding cookies to user ID %lu", + (unsigned long) tpwd->pw_uid); + } + retval = PAM_SESSION_ERR; + goto cleanup; + } + + /* Check that both users are amenable to this. By default, this + * boils down to this policy: + * export(ruser=root): only if <user> is listed in .xauth/export + * export(ruser=*) if <user> is listed in .xauth/export, or + * if .xauth/export does not exist + * import(user=*): if <ruser> is listed in .xauth/import, or + * if .xauth/import does not exist */ + i = (getuid() != 0 || tpwd->pw_uid == 0) ? PAM_SUCCESS : PAM_PERM_DENIED; + i = check_acl(pamh, "export", rpwd->pw_name, user, i, debug); + if (i != PAM_SUCCESS) { + retval = PAM_SESSION_ERR; + goto cleanup; + } + i = PAM_SUCCESS; + i = check_acl(pamh, "import", user, rpwd->pw_name, i, debug); + if (i != PAM_SUCCESS) { + retval = PAM_SESSION_ERR; + goto cleanup; + } + + /* Figure out where the source user's .Xauthority file is. */ + if (getenv(XAUTHENV) != NULL) { + cookiefile = strdup(getenv(XAUTHENV)); + } else { + cookiefile = malloc(strlen(rpwd->pw_dir) + 1 + + strlen(XAUTHDEF) + 1); + if (cookiefile == NULL) { + retval = PAM_SESSION_ERR; + goto cleanup; + } + strcpy(cookiefile, rpwd->pw_dir); + strcat(cookiefile, "/"); + strcat(cookiefile, XAUTHDEF); + } + if (debug) { + pam_syslog(pamh, LOG_DEBUG, "reading keys from `%s'", + cookiefile); + } + + /* Read the user's .Xauthority file. Because the current UID is + * the original user's UID, this will only fail if something has + * gone wrong, or we have no cookies. */ + if (debug) { + pam_syslog(pamh, LOG_DEBUG, + "running \"%s %s %s %s %s\" as %lu/%lu", + xauth, "-f", cookiefile, "nlist", display, + (unsigned long) getuid(), (unsigned long) getgid()); + } + if (run_coprocess(NULL, &cookie, + getuid(), getgid(), + xauth, "-f", cookiefile, "nlist", display, + NULL) == 0) { + /* Check that we got a cookie. If not, we get creative. */ + if (((cookie == NULL) || (strlen(cookie) == 0)) && + ((strncmp(display, "localhost:", 10) == 0) || + (strncmp(display, "localhost/unix:", 15) == 0))) { + char *t, *screen; + size_t tlen, slen; + /* Free the useless cookie string. */ + if (cookie != NULL) { + free(cookie); + cookie = NULL; + } + /* Allocate enough space to hold an adjusted name. */ + tlen = strlen(display) + LINE_MAX + 1; + t = malloc(tlen); + if (t != NULL) { + memset(t, 0, tlen); + if (gethostname(t, tlen - 1) != -1) { + /* Append the protocol and then the + * screen number. */ + if (strlen(t) < tlen - 6) { + strcat(t, "/unix:"); + } + screen = strchr(display, ':'); + if (screen != NULL) { + screen++; + slen = strlen(screen); + if (strlen(t) + slen < tlen) { + strcat(t, screen); + } + } + if (debug) { + pam_syslog(pamh, LOG_DEBUG, + "no key for `%s', " + "trying `%s'", + display, t); + } + /* Read the cookie for this display. */ + if (debug) { + pam_syslog(pamh, LOG_DEBUG, + "running " + "\"%s %s %s %s %s\" as " + "%lu/%lu", + xauth, + "-f", + cookiefile, + "nlist", + t, + (unsigned long) getuid(), + (unsigned long) getgid()); + } + run_coprocess(NULL, &cookie, + getuid(), getgid(), + xauth, "-f", cookiefile, + "nlist", t, NULL); + } + free(t); + t = NULL; + } + } + + /* Check that we got a cookie, this time for real. */ + if ((cookie == NULL) || (strlen(cookie) == 0)) { + if (debug) { + pam_syslog(pamh, LOG_DEBUG, "no key"); + } + retval = PAM_SESSION_ERR; + goto cleanup; + } + + /* Generate the environment variable + * "XAUTHORITY=<homedir>/filename". */ + if (asprintf(&xauthority, "%s=%s/%s", + XAUTHENV, tpwd->pw_dir, XAUTHTMP) < 0) { + xauthority = NULL; + if (debug) { + pam_syslog(pamh, LOG_DEBUG, "out of memory"); + } + retval = PAM_SESSION_ERR; + goto cleanup; + } + + /* Generate a new file to hold the data. */ + euid = geteuid(); + setfsuid(tpwd->pw_uid); + fd = mkstemp(xauthority + strlen(XAUTHENV) + 1); + setfsuid(euid); + if (fd == -1) { + pam_syslog(pamh, LOG_ERR, + "error creating temporary file `%s': %m", + xauthority + strlen(XAUTHENV) + 1); + retval = PAM_SESSION_ERR; + goto cleanup; + } + /* Set permissions on the new file and dispose of the + * descriptor. */ + if (fchown(fd, tpwd->pw_uid, tpwd->pw_gid) < 0) + pam_syslog (pamh, LOG_ERR, "fchown: %m"); + close(fd); + + /* Get a copy of the filename to save as a data item for + * removal at session-close time. */ + free(cookiefile); + cookiefile = strdup(xauthority + strlen(XAUTHENV) + 1); + + /* Save the filename. */ + if (pam_set_data(pamh, DATANAME, cookiefile, cleanup) != PAM_SUCCESS) { + pam_syslog(pamh, LOG_ERR, + "error saving name of temporary file `%s'", + cookiefile); + unlink(cookiefile); + retval = PAM_SESSION_ERR; + goto cleanup; + } + + /* Set the new variable in the environment. */ + if (pam_putenv (pamh, xauthority) != PAM_SUCCESS) + pam_syslog(pamh, LOG_ERR, + "can't set environment variable '%s'", + xauthority); + putenv (xauthority); /* The environment owns this string now. */ + xauthority = NULL; /* Don't free environment variables. */ + + /* set $DISPLAY in pam handle to make su - work */ + { + char *d; + + if (asprintf(&d, "DISPLAY=%s", display) < 0) + { + pam_syslog(pamh, LOG_DEBUG, "out of memory"); + cookiefile = NULL; + retval = PAM_SESSION_ERR; + goto cleanup; + } + + if (pam_putenv (pamh, d) != PAM_SUCCESS) + pam_syslog (pamh, LOG_DEBUG, + "can't set environment variable '%s'", d); + free (d); + } + + /* Merge the cookie we read before into the new file. */ + if (debug) { + pam_syslog(pamh, LOG_DEBUG, + "writing key `%s' to temporary file `%s'", + cookie, cookiefile); + } + if (debug) { + pam_syslog(pamh, LOG_DEBUG, + "running \"%s %s %s %s %s\" as %lu/%lu", + xauth, "-f", cookiefile, "nmerge", "-", + (unsigned long) tpwd->pw_uid, + (unsigned long) tpwd->pw_gid); + } + run_coprocess(cookie, &tmp, + tpwd->pw_uid, tpwd->pw_gid, + xauth, "-f", cookiefile, "nmerge", "-", NULL); + + /* We don't need to keep a copy of these around any more. */ + cookiefile = NULL; + free(tmp); + } +cleanup: + /* Unset any old XAUTHORITY variable in the environment. */ + if (retval != PAM_SUCCESS && getenv (XAUTHENV)) + unsetenv (XAUTHENV); + free(cookiefile); + free(cookie); + free(xauthority); + return retval; +} + +int +pam_sm_close_session (pam_handle_t *pamh, int flags UNUSED, + int argc, const char **argv) +{ + void *cookiefile; + int i, debug = 0; + + /* Parse arguments. We don't understand many, so no sense in breaking + * this into a separate function. */ + for (i = 0; i < argc; i++) { + if (strcmp(argv[i], "debug") == 0) { + debug = 1; + continue; + } + if (strncmp(argv[i], "xauthpath=", 10) == 0) { + continue; + } + if (strncmp(argv[i], "systemuser=", 11) == 0) { + continue; + } + if (strncmp(argv[i], "targetuser=", 11) == 0) { + continue; + } + pam_syslog(pamh, LOG_WARNING, "unrecognized option `%s'", + argv[i]); + } + + /* Try to retrieve the name of a file we created when the session was + * opened. */ + if (pam_get_data(pamh, DATANAME, (const void**) &cookiefile) == PAM_SUCCESS) { + /* We'll only try to remove the file once. */ + if (strlen((char*)cookiefile) > 0) { + if (debug) { + pam_syslog(pamh, LOG_DEBUG, "removing `%s'", + (char*)cookiefile); + } + unlink((char*)cookiefile); + *((char*)cookiefile) = '\0'; + } + } + return PAM_SUCCESS; +} + +/* static module data */ +#ifdef PAM_STATIC +struct pam_module _pam_xauth_modstruct = { + "pam_xauth", + NULL, + NULL, + NULL, + pam_sm_open_session, + pam_sm_close_session, + NULL +}; +#endif diff --git a/modules/pam_xauth/tst-pam_xauth b/modules/pam_xauth/tst-pam_xauth new file mode 100755 index 00000000..32948963 --- /dev/null +++ b/modules/pam_xauth/tst-pam_xauth @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_xauth.so |