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This change introduces pam_modutil_sanitize_helper_fds - a new function
that redirects standard descriptors and closes all other descriptors.
pam_modutil_sanitize_helper_fds supports three types of input and output
redirection:
- PAM_MODUTIL_IGNORE_FD: do not redirect at all.
- PAM_MODUTIL_PIPE_FD: redirect to a pipe. For stdin, it is implemented
by creating a pipe, closing its write end, and redirecting stdin to
its read end. Likewise, for stdout/stderr it is implemented by
creating a pipe, closing its read end, and redirecting to its write
end. Unlike stdin redirection, stdout/stderr redirection to a pipe
has a side effect that a process writing to such descriptor should be
prepared to handle SIGPIPE appropriately.
- PAM_MODUTIL_NULL_FD: redirect to /dev/null. For stdin, it is
implemented via PAM_MODUTIL_PIPE_FD because there is no functional
difference. For stdout/stderr, it is classic redirection to
/dev/null.
PAM_MODUTIL_PIPE_FD is usually more suitable due to linux kernel
security restrictions, but when the helper process might be writing to
the corresponding descriptor and termination of the helper process by
SIGPIPE is not desirable, one should choose PAM_MODUTIL_NULL_FD.
* libpam/pam_modutil_sanitize.c: New file.
* libpam/Makefile.am (libpam_la_SOURCES): Add it.
* libpam/include/security/pam_modutil.h (pam_modutil_redirect_fd,
pam_modutil_sanitize_helper_fds): New declarations.
* libpam/libpam.map (LIBPAM_MODUTIL_1.1.9): New interface.
* modules/pam_exec/pam_exec.c (call_exec): Use
pam_modutil_sanitize_helper_fds.
* modules/pam_mkhomedir/pam_mkhomedir.c (create_homedir): Likewise.
* modules/pam_unix/pam_unix_acct.c (_unix_run_verify_binary): Likewise.
* modules/pam_unix/pam_unix_passwd.c (_unix_run_update_binary):
Likewise.
* modules/pam_unix/support.c (_unix_run_helper_binary): Likewise.
* modules/pam_xauth/pam_xauth.c (run_coprocess): Likewise.
* modules/pam_unix/support.h (MAX_FD_NO): Remove.
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Purpose of commit: bugfix
Commit summary:
---------------
2010-10-04 Dmitry V. Levin <ldv@altlinux.org>
* libpam/pam_modutil_priv.c: New file.
* libpam/Makefile.am (libpam_la_SOURCES): Add it.
* libpam/include/security/pam_modutil.h (struct pam_modutil_privs,
PAM_MODUTIL_DEF_PRIVS, pam_modutil_drop_priv,
pam_modutil_regain_priv): New declarations.
* libpam/libpam.map (LIBPAM_MODUTIL_1.1.3): New interface.
* modules/pam_env/pam_env.c (handle_env): Use new pam_modutil interface.
* modules/pam_mail/pam_mail.c (_do_mail): Likewise.
* modules/pam_xauth/pam_xauth.c (check_acl, pam_sm_open_session,
pam_sm_close_session): Likewise.
(pam_sm_open_session): Remove redundant fchown call.
Fixes CVE-2010-3430, CVE-2010-3431.
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Purpose of commit: regression fix
Commit summary:
---------------
2009-11-10 Thorsten Kukuk <kukuk@suse.de>
* doc/man/pam_get_authtok.3.xml: Document pam_get_authtok_noverify
and pam_get_authtok_verify.
* libpam/Makefile.am (libpam_la_LDFLAGS): Bump revesion of libpam.
* libpam/pam_get_authtok.c (pam_get_authtok_internal): Renamed
from pam_get_authtok, add flags argument, always check return
values.
* modules/pam_cracklib/pam_cracklib.c (pam_sm_chauthtok): Use
pam_get_authtok_noverify and pam_get_authtok_verify.
* libpam/include/security/pam_ext.h: Add prototypes for
pam_get_authtok_noverify and pam_get_authtok_verify.
* libpam/libpam.map: Add new pam_get_authtok_* functions.
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Purpose of commit: new feature
Commit summary:
---------------
2008-12-03 Thorsten Kukuk <kukuk@suse.de>
* doc/man/Makefile.am: Add pam_get_authtok.3.xml.
* doc/man/pam_get_authtok.3.xml: New.
* libpam/Makefile.am: Add pam_get_authtok.c.
* libpam/libpam.map: Export pam_get_authtok.
* libpam/pam_get_authtok.c: New.
* libpam/pam_private.h: Add mod_argc and mod_argv to pam_handle.
* libpam_include/security/pam_ext.h: Add pam_get_authtok
prototype.
* modules/pam_cracklib/pam_cracklib.c: Use pam_get_authtok.
* modules/pam_pwhistory/pam_pwhistory.c: Likewise.
* po/POTFILES.in: Add libpam/pam_get_authtok.c.
* xtests/tst-pam_cracklib1.c: Adjust error codes.
* modules/pam_timestamp/Makefile.am: Remove hmactest.c from
EXTRA_DIST.
* po/*.po: Regenerated.
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Purpose of commit: new feature and cleanup
Commit summary:
---------------
2007-12-07 Tomas Mraz <t8m@centrum.cz>
* libpam/libpam.map: Add LIBPAM_MODUTIL_1.1 version.
* libpam/pam_audit.c: Add _pam_audit_open() and
pam_modutil_audit_write().
(_pam_auditlog): Call _pam_audit_open().
* libpam/include/security/pam_modutil.h: Add pam_modutil_audit_write().
* modules/pam_access/pam_access.8.xml: Add noaudit option.
Document auditing.
* modules/pam_access/pam_access.c: Move fs, sep, pam_access_debug, and
only_new_group_syntax variables to struct login_info. Add noaudit
member.
(_parse_args): Adjust for the move of variables and add support for
noaudit option.
(group_match): Add debug parameter.
(string_match): Likewise.
(network_netmask_match): Likewise.
(login_access): Adjust for the move of variables. Add nonall_match.
Add call to pam_modutil_audit_write().
(list_match): Adjust for the move of variables.
(user_match): Likewise.
(from_match): Likewise.
(pam_sm_authenticate): Call _parse_args() earlier.
* modules/pam_limits/pam_limits.8.xml: Add noaudit option.
Document auditing.
* modules/pam_limits/pam_limits.c (_pam_parse): Add noaudit option.
(setup_limits): Call pam_modutil_audit_write().
* modules/pam_time/pam_time.8.xml: Add debug and noaudit options.
Document auditing.
* modules/pam_time/pam_time.c: Add option parsing (_pam_parse()).
(check_account): Call _pam_parse(). Call pam_modutil_audit_write()
and pam_syslog() on login denials.
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Purpose of commit: cleanup
Commit summary:
---------------
2006-06-14 Thorsten Kukuk <kukuk@thkukuk.de>
* configure.in: Remove --enable-memory-debug, add option
to disable prelude if installed.
* modules/pam_tally/pam_tally.c: Remove MEMORY_DEBUG
* modules/pam_filter/upperLOWER/upperLOWER.c: Likewise.
* modules/pam_unix/unix_chkpwd.c: Likewise.
* libpam/include/security/_pam_types.h: Likewise.
* libpam/libpam.map: Remove LIBPAM_MALLOC_DEBUG export.
* libpam/pam_malloc.c: Remove file.
* libpam/Makefile.am: Remove pam_malloc.c and pam_malloc.h.
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Purpose of commit: new feature
Commit summary:
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Moved functions from pammodutil to libpam.
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Purpose of commit: new feature
Commit summary:
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Add pam_syslog to unify log messages from PAM modules.
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Purpose of commit: new feature
Commit summary:
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Add PAM extensions pam_*prompt, pam_*error and pam_*info for usage
by modules to libpam, add new pam_ext.h header file with prototypes.
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Purpose of commit: cleanup
Commit summary:
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Remove unused files.
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Purpose of commit: new feature
Commit summary:
---------------
Big "automake/autoconf/libtool" commit
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