diff options
Diffstat (limited to 'Linux-PAM/modules/pam_sepermit')
| -rw-r--r-- | Linux-PAM/modules/pam_sepermit/Makefile.am | 43 | ||||
| -rw-r--r-- | Linux-PAM/modules/pam_sepermit/Makefile.in | 722 | ||||
| -rw-r--r-- | Linux-PAM/modules/pam_sepermit/README | 51 | ||||
| -rw-r--r-- | Linux-PAM/modules/pam_sepermit/README.xml | 41 | ||||
| -rw-r--r-- | Linux-PAM/modules/pam_sepermit/pam_sepermit.8 | 110 | ||||
| -rw-r--r-- | Linux-PAM/modules/pam_sepermit/pam_sepermit.8.xml | 189 | ||||
| -rw-r--r-- | Linux-PAM/modules/pam_sepermit/pam_sepermit.c | 405 | ||||
| -rw-r--r-- | Linux-PAM/modules/pam_sepermit/sepermit.conf | 11 | ||||
| -rwxr-xr-x | Linux-PAM/modules/pam_sepermit/tst-pam_sepermit | 2 |
9 files changed, 1574 insertions, 0 deletions
diff --git a/Linux-PAM/modules/pam_sepermit/Makefile.am b/Linux-PAM/modules/pam_sepermit/Makefile.am new file mode 100644 index 00000000..579e142f --- /dev/null +++ b/Linux-PAM/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/Linux-PAM/modules/pam_sepermit/Makefile.in b/Linux-PAM/modules/pam_sepermit/Makefile.in new file mode 100644 index 00000000..9ab1aece --- /dev/null +++ b/Linux-PAM/modules/pam_sepermit/Makefile.in @@ -0,0 +1,722 @@ +# Makefile.in generated by automake 1.10 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, +# 2003, 2004, 2005, 2006 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, 2007 Thorsten Kukuk <kukuk@thkukuk.de> +# Copyright (c) 2008 Red Hat, Inc. +# + + +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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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/Linux-PAM/modules/pam_sepermit/README b/Linux-PAM/modules/pam_sepermit/README new file mode 100644 index 00000000..11429832 --- /dev/null +++ b/Linux-PAM/modules/pam_sepermit/README @@ -0,0 +1,51 @@ +pam_sepermit — PAM module to allow/deny login depending on SELinux enforcement +state + +━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ + +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/Linux-PAM/modules/pam_sepermit/README.xml b/Linux-PAM/modules/pam_sepermit/README.xml new file mode 100644 index 00000000..bb65951c --- /dev/null +++ b/Linux-PAM/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/Linux-PAM/modules/pam_sepermit/pam_sepermit.8 b/Linux-PAM/modules/pam_sepermit/pam_sepermit.8 new file mode 100644 index 00000000..217d3df5 --- /dev/null +++ b/Linux-PAM/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: 02/04/2008 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" +.TH "PAM_SEPERMIT" "8" "02/04/2008" "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/Linux-PAM/modules/pam_sepermit/pam_sepermit.8.xml b/Linux-PAM/modules/pam_sepermit/pam_sepermit.8.xml new file mode 100644 index 00000000..c2546b62 --- /dev/null +++ b/Linux-PAM/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/Linux-PAM/modules/pam_sepermit/pam_sepermit.c b/Linux-PAM/modules/pam_sepermit/pam_sepermit.c new file mode 100644 index 00000000..47f95030 --- /dev/null +++ b/Linux-PAM/modules/pam_sepermit/pam_sepermit.c @@ -0,0 +1,405 @@ +/****************************************************************************** + * 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; + } + + 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/Linux-PAM/modules/pam_sepermit/sepermit.conf b/Linux-PAM/modules/pam_sepermit/sepermit.conf new file mode 100644 index 00000000..951f3dfe --- /dev/null +++ b/Linux-PAM/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/Linux-PAM/modules/pam_sepermit/tst-pam_sepermit b/Linux-PAM/modules/pam_sepermit/tst-pam_sepermit new file mode 100755 index 00000000..6e6d2363 --- /dev/null +++ b/Linux-PAM/modules/pam_sepermit/tst-pam_sepermit @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_sepermit.so |