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-rw-r--r--modules/pam_selinux/Makefile.am40
-rw-r--r--modules/pam_selinux/Makefile.in1150
-rw-r--r--modules/pam_selinux/README85
-rw-r--r--modules/pam_selinux/README.xml41
-rw-r--r--modules/pam_selinux/pam_selinux.8151
-rw-r--r--modules/pam_selinux/pam_selinux.8.xml276
-rw-r--r--modules/pam_selinux/pam_selinux.c841
-rw-r--r--modules/pam_selinux/pam_selinux_check.835
-rw-r--r--modules/pam_selinux/pam_selinux_check.c161
-rwxr-xr-xmodules/pam_selinux/tst-pam_selinux2
10 files changed, 2782 insertions, 0 deletions
diff --git a/modules/pam_selinux/Makefile.am b/modules/pam_selinux/Makefile.am
new file mode 100644
index 0000000..28c60d8
--- /dev/null
+++ b/modules/pam_selinux/Makefile.am
@@ -0,0 +1,40 @@
+#
+# 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_la_LDFLAGS = -no-undefined -avoid-version -module
+pam_selinux_la_LIBADD = $(top_builddir)/libpam/libpam.la @LIBSELINUX@ @LIBAUDIT@
+if HAVE_VERSIONING
+ pam_selinux_la_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map
+endif
+
+if HAVE_LIBSELINUX
+ securelib_LTLIBRARIES = pam_selinux.la
+ noinst_PROGRAMS = pam_selinux_check
+ pam_selinux_check_LDADD = $(top_builddir)/libpam/libpam.la \
+ $(top_builddir)/libpam_misc/libpam_misc.la
+endif
+if ENABLE_REGENERATE_MAN
+noinst_DATA = README pam_selinux.8
+README: pam_selinux.8.xml
+-include $(top_srcdir)/Make.xml.rules
+endif
diff --git a/modules/pam_selinux/Makefile.in b/modules/pam_selinux/Makefile.in
new file mode 100644
index 0000000..6c39eef
--- /dev/null
+++ b/modules/pam_selinux/Makefile.in
@@ -0,0 +1,1150 @@
+# Makefile.in generated by automake 1.13.4 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2013 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+#
+# Copyright (c) 2005, 2006, 2007 Thorsten Kukuk <kukuk@thkukuk.de>
+#
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+
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+am__installdirs = "$(DESTDIR)$(securelibdir)" "$(DESTDIR)$(man8dir)"
+LTLIBRARIES = $(securelib_LTLIBRARIES)
+pam_selinux_la_DEPENDENCIES = $(top_builddir)/libpam/libpam.la
+pam_selinux_la_SOURCES = pam_selinux.c
+pam_selinux_la_OBJECTS = pam_selinux.lo
+AM_V_lt = $(am__v_lt_@AM_V@)
+am__v_lt_ = $(am__v_lt_@AM_DEFAULT_V@)
+am__v_lt_0 = --silent
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+ $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=link $(CCLD) \
+ $(AM_CFLAGS) $(CFLAGS) $(pam_selinux_la_LDFLAGS) $(LDFLAGS) -o \
+ $@
+@HAVE_LIBSELINUX_TRUE@am_pam_selinux_la_rpath = -rpath $(securelibdir)
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+ case $$dist_files in \
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+ if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
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+ find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
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+ test -f "$(distdir)/$$file" \
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+distclean-generic:
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+@ENABLE_REGENERATE_MAN_TRUE@README: pam_selinux.8.xml
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+# 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.
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diff --git a/modules/pam_selinux/README b/modules/pam_selinux/README
new file mode 100644
index 0000000..fb4d449
--- /dev/null
+++ b/modules/pam_selinux/README
@@ -0,0 +1,85 @@
+pam_selinux — PAM module to set the default security context
+
+━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+
+DESCRIPTION
+
+pam_selinux is a PAM module that sets up the default SELinux security context
+for the next executed process.
+
+When a new session is started, the open_session part of the module computes and
+sets up the execution security context used for the next execve(2) call, the
+file security context for the controlling terminal, and the security context
+used for creating a new kernel keyring.
+
+When the session is ended, the close_session part of the module restores old
+security contexts that were in effect before the change made by the
+open_session part of the module.
+
+Adding pam_selinux into the PAM stack might disrupt behavior of other PAM
+modules which execute applications. To avoid that, pam_selinux.so open should
+be placed after such modules in the PAM stack, and pam_selinux.so close should
+be placed before them. When such a placement is not feasible, pam_selinux.so
+restore could be used to temporary restore original security contexts.
+
+OPTIONS
+
+open
+
+ Only execute the open_session part of the module.
+
+close
+
+ Only execute the close_session part of the module.
+
+restore
+
+ In open_session part of the module, temporarily restore the security
+ contexts as they were before the previous call of the module. Another call
+ of this module without the restore option will set up the new security
+ contexts again.
+
+nottys
+
+ Do not setup security context of the controlling terminal.
+
+debug
+
+ Turn on debug messages via syslog(3).
+
+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.
+
+env_params
+
+ Attempt to obtain a custom security context role from PAM environment. If
+ MLS is on, obtain also sensitivity level. This option and the
+ select_context option are mutually exclusive. The respective PAM
+ environment variables are SELINUX_ROLE_REQUESTED, SELINUX_LEVEL_REQUESTED,
+ and SELINUX_USE_CURRENT_RANGE. The first two variables are self describing
+ and the last one if set to 1 makes the PAM module behave as if the
+ use_current_range was specified on the command line of the module.
+
+use_current_range
+
+ Use the sensitivity level of the current process for the user context
+ instead of the default level. Also suppresses asking of the sensitivity
+ level from the user or obtaining it from PAM environment.
+
+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 0000000..7e1baf5
--- /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 0000000..5822cc1
--- /dev/null
+++ b/modules/pam_selinux/pam_selinux.8
@@ -0,0 +1,151 @@
+'\" t
+.\" Title: pam_selinux
+.\" Author: [see the "AUTHOR" section]
+.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
+.\" Date: 05/18/2017
+.\" Manual: Linux-PAM Manual
+.\" Source: Linux-PAM Manual
+.\" Language: English
+.\"
+.TH "PAM_SELINUX" "8" "05/18/2017" "Linux-PAM Manual" "Linux\-PAM Manual"
+.\" -----------------------------------------------------------------
+.\" * Define some portability stuff
+.\" -----------------------------------------------------------------
+.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.\" http://bugs.debian.org/507673
+.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
+.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.ie \n(.g .ds Aq \(aq
+.el .ds Aq '
+.\" -----------------------------------------------------------------
+.\" * set default formatting
+.\" -----------------------------------------------------------------
+.\" disable hyphenation
+.nh
+.\" disable justification (adjust text to left margin only)
+.ad l
+.\" -----------------------------------------------------------------
+.\" * MAIN CONTENT STARTS HERE *
+.\" -----------------------------------------------------------------
+.SH "NAME"
+pam_selinux \- PAM module to set the default security context
+.SH "SYNOPSIS"
+.HP \w'\fBpam_selinux\&.so\fR\ 'u
+\fBpam_selinux\&.so\fR [open] [close] [restore] [nottys] [debug] [verbose] [select_context] [env_params] [use_current_range]
+.SH "DESCRIPTION"
+.PP
+pam_selinux is a PAM module that sets up the default SELinux security context for the next executed process\&.
+.PP
+When a new session is started, the open_session part of the module computes and sets up the execution security context used for the next
+\fBexecve\fR(2)
+call, the file security context for the controlling terminal, and the security context used for creating a new kernel keyring\&.
+.PP
+When the session is ended, the close_session part of the module restores old security contexts that were in effect before the change made by the open_session part of the module\&.
+.PP
+Adding pam_selinux into the PAM stack might disrupt behavior of other PAM modules which execute applications\&. To avoid that,
+\fIpam_selinux\&.so open\fR
+should be placed after such modules in the PAM stack, and
+\fIpam_selinux\&.so close\fR
+should be placed before them\&. When such a placement is not feasible,
+\fIpam_selinux\&.so restore\fR
+could be used to temporary restore original security contexts\&.
+.SH "OPTIONS"
+.PP
+\fBopen\fR
+.RS 4
+Only execute the open_session part of the module\&.
+.RE
+.PP
+\fBclose\fR
+.RS 4
+Only execute the close_session part of the module\&.
+.RE
+.PP
+\fBrestore\fR
+.RS 4
+In open_session part of the module, temporarily restore the security contexts as they were before the previous call of the module\&. Another call of this module without the restore option will set up the new security contexts again\&.
+.RE
+.PP
+\fBnottys\fR
+.RS 4
+Do not setup security context of the controlling terminal\&.
+.RE
+.PP
+\fBdebug\fR
+.RS 4
+Turn on debug messages via
+\fBsyslog\fR(3)\&.
+.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
+\fBenv_params\fR
+.RS 4
+Attempt to obtain a custom security context role from PAM environment\&. If MLS is on, obtain also sensitivity level\&. This option and the select_context option are mutually exclusive\&. The respective PAM environment variables are
+\fISELINUX_ROLE_REQUESTED\fR,
+\fISELINUX_LEVEL_REQUESTED\fR, and
+\fISELINUX_USE_CURRENT_RANGE\fR\&. The first two variables are self describing and the last one if set to 1 makes the PAM module behave as if the use_current_range was specified on the command line of the module\&.
+.RE
+.PP
+\fBuse_current_range\fR
+.RS 4
+Use the sensitivity level of the current process for the user context instead of the default level\&. Also suppresses asking of the sensitivity level from the user or obtaining it from PAM environment\&.
+.RE
+.SH "MODULE TYPES PROVIDED"
+.PP
+Only the
+\fBsession\fR
+module type is provided\&.
+.SH "RETURN VALUES"
+.PP
+PAM_SUCCESS
+.RS 4
+The security context was set successfully\&.
+.RE
+.PP
+PAM_SESSION_ERR
+.RS 4
+Unable to get or set a valid context\&.
+.RE
+.PP
+PAM_USER_UNKNOWN
+.RS 4
+The user is not known to the system\&.
+.RE
+.PP
+PAM_BUF_ERR
+.RS 4
+Memory allocation error\&.
+.RE
+.SH "EXAMPLES"
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+auth required pam_unix\&.so
+session required pam_permit\&.so
+session optional pam_selinux\&.so
+
+.fi
+.if n \{\
+.RE
+.\}
+.SH "SEE ALSO"
+.PP
+\fBexecve\fR(2),
+\fBtty\fR(4),
+\fBpam.d\fR(5),
+\fBpam\fR(8),
+\fBselinux\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 0000000..28d465f
--- /dev/null
+++ b/modules/pam_selinux/pam_selinux.8.xml
@@ -0,0 +1,276 @@
+<?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">
+ open
+ </arg>
+ <arg choice="opt">
+ close
+ </arg>
+ <arg choice="opt">
+ restore
+ </arg>
+ <arg choice="opt">
+ nottys
+ </arg>
+ <arg choice="opt">
+ debug
+ </arg>
+ <arg choice="opt">
+ verbose
+ </arg>
+ <arg choice="opt">
+ select_context
+ </arg>
+ <arg choice="opt">
+ env_params
+ </arg>
+ <arg choice="opt">
+ use_current_range
+ </arg>
+ </cmdsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1 id="pam_selinux-description">
+ <title>DESCRIPTION</title>
+ <para>
+ pam_selinux is a PAM module that sets up the default SELinux security
+ context for the next executed process.
+ </para>
+ <para>
+ When a new session is started, the open_session part of the module
+ computes and sets up the execution security context used for the next
+ <citerefentry>
+ <refentrytitle>execve</refentrytitle><manvolnum>2</manvolnum>
+ </citerefentry>
+ call, the file security context for the controlling terminal, and
+ the security context used for creating a new kernel keyring.
+ </para>
+ <para>
+ When the session is ended, the close_session part of the module restores
+ old security contexts that were in effect before the change made
+ by the open_session part of the module.
+ </para>
+ <para>
+ Adding pam_selinux into the PAM stack might disrupt behavior of other
+ PAM modules which execute applications. To avoid that,
+ <emphasis>pam_selinux.so open</emphasis> should be placed after such
+ modules in the PAM stack, and <emphasis>pam_selinux.so close</emphasis>
+ should be placed before them. When such a placement is not feasible,
+ <emphasis>pam_selinux.so restore</emphasis> could be used to temporary
+ restore original security contexts.
+ </para>
+ </refsect1>
+
+ <refsect1 id="pam_selinux-options">
+ <title>OPTIONS</title>
+ <variablelist>
+ <varlistentry>
+ <term>
+ <option>open</option>
+ </term>
+ <listitem>
+ <para>
+ Only execute the open_session part of the module.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>close</option>
+ </term>
+ <listitem>
+ <para>
+ Only execute the close_session part of the module.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>restore</option>
+ </term>
+ <listitem>
+ <para>
+ In open_session part of the module, temporarily restore the
+ security contexts as they were before the previous call of
+ the module. Another call of this module without the restore
+ option will set up the new security contexts again.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>nottys</option>
+ </term>
+ <listitem>
+ <para>
+ Do not setup security context of the controlling terminal.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>debug</option>
+ </term>
+ <listitem>
+ <para>
+ Turn on debug messages via
+ <citerefentry>
+ <refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum>
+ </citerefentry>.
+ </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>env_params</option>
+ </term>
+ <listitem>
+ <para>
+ Attempt to obtain a custom security context role from PAM environment.
+ If MLS is on, obtain also sensitivity level. This option and the
+ select_context option are mutually exclusive. The respective PAM
+ environment variables are <emphasis>SELINUX_ROLE_REQUESTED</emphasis>,
+ <emphasis>SELINUX_LEVEL_REQUESTED</emphasis>, and
+ <emphasis>SELINUX_USE_CURRENT_RANGE</emphasis>. The first two variables
+ are self describing and the last one if set to 1 makes the PAM module behave as
+ if the use_current_range was specified on the command line of the module.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>use_current_range</option>
+ </term>
+ <listitem>
+ <para>
+ Use the sensitivity level of the current process for the user context
+ instead of the default level. Also suppresses asking of the
+ sensitivity level from the user or obtaining it from PAM environment.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1 id="pam_selinux-types">
+ <title>MODULE TYPES PROVIDED</title>
+ <para>
+ Only the <option>session</option> module type is provided.
+ </para>
+ </refsect1>
+
+ <refsect1 id='pam_selinux-return_values'>
+ <title>RETURN VALUES</title>
+ <variablelist>
+ <varlistentry>
+ <term>PAM_SUCCESS</term>
+ <listitem>
+ <para>
+ The security context was set successfully.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_SESSION_ERR</term>
+ <listitem>
+ <para>
+ Unable to get or set a valid context.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_USER_UNKNOWN</term>
+ <listitem>
+ <para>
+ The user is not known to the system.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_BUF_ERR</term>
+ <listitem>
+ <para>
+ Memory allocation error.
+ </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>execve</refentrytitle><manvolnum>2</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>tty</refentrytitle><manvolnum>4</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>pam.d</refentrytitle><manvolnum>5</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>selinux</refentrytitle><manvolnum>8</manvolnum>
+ </citerefentry>
+ </para>
+ </refsect1>
+
+ <refsect1 id='pam_selinux-author'>
+ <title>AUTHOR</title>
+ <para>
+ pam_selinux was written by Dan Walsh &lt;dwalsh@redhat.com&gt;.
+ </para>
+ </refsect1>
+
+</refentry>
diff --git a/modules/pam_selinux/pam_selinux.c b/modules/pam_selinux/pam_selinux.c
new file mode 100644
index 0000000..348cdd4
--- /dev/null
+++ b/modules/pam_selinux/pam_selinux.c
@@ -0,0 +1,841 @@
+/******************************************************************************
+ * A module for Linux-PAM that will set the default security context after login
+ * via PAM.
+ *
+ * Copyright (c) 2003-2008 Red Hat, Inc.
+ * Written by Dan Walsh <dwalsh@redhat.com>
+ * Additional improvements by Tomas Mraz <tmraz@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;
+ const void *tty = NULL, *rhost = 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;
+ }
+ (void)pam_get_item(pamh, PAM_TTY, &tty);
+ (void)pam_get_item(pamh, PAM_RHOST, &rhost);
+ 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, rhost, NULL, tty, 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 **response, int debug)
+{
+ int rc;
+ if (def)
+ rc = pam_prompt (pamh, PAM_PROMPT_ECHO_ON, response, "%s [%s] ", text, def);
+ else
+ rc = pam_prompt (pamh, PAM_PROMPT_ECHO_ON, response, "%s ", text);
+
+ if (*response == NULL) {
+ rc = PAM_CONV_ERR;
+ }
+
+ if (rc != PAM_SUCCESS) {
+ pam_syslog(pamh, LOG_WARNING, "No response to query: %s", text);
+ } else if (debug)
+ pam_syslog(pamh, LOG_NOTICE, "%s %s", text, *response);
+ return rc;
+}
+
+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;
+ security_class_t class;
+ access_vector_t bit;
+ context_t src_context;
+ context_t dst_context;
+
+ class = string_to_security_class("context");
+ if (!class) {
+ pam_syslog(pamh, LOG_ERR, "Failed to translate security class context. %m");
+ return 0;
+ }
+
+ bit = string_to_av_perm(class, "contains");
+ if (!bit) {
+ pam_syslog(pamh, LOG_ERR, "Failed to translate av perm contains. %m");
+ return 0;
+ }
+
+ src_context = context_new (src);
+ 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, class, 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 defaultcon, int use_current_range, int debug)
+{
+ security_context_t newcon=NULL;
+ context_t new_context;
+ int mls_enabled = is_selinux_mls_enabled();
+ char *response=NULL;
+ char *type=NULL;
+ char resp_val = 0;
+
+ pam_prompt (pamh, PAM_TEXT_INFO, NULL, _("Default Security Context %s\n"), defaultcon);
+
+ while (1) {
+ if (query_response(pamh,
+ _("Would you like to enter a different role or level?"), "n",
+ &response, debug) == PAM_SUCCESS) {
+ resp_val = response[0];
+ _pam_drop(response);
+ } else {
+ resp_val = 'N';
+ }
+ if ((resp_val == 'y') || (resp_val == 'Y'))
+ {
+ if ((new_context = context_new(defaultcon)) == NULL)
+ goto fail_set;
+
+ /* Allow the user to enter role and level individually */
+ if (query_response(pamh, _("role:"), context_role_get(new_context),
+ &response, debug) == PAM_SUCCESS && response[0]) {
+ if (get_default_type(response, &type)) {
+ pam_prompt (pamh, PAM_ERROR_MSG, NULL, _("No default type for role %s\n"), response);
+ _pam_drop(response);
+ continue;
+ } else {
+ if (context_role_set(new_context, response))
+ goto fail_set;
+ if (context_type_set (new_context, type))
+ goto fail_set;
+ _pam_drop(type);
+ }
+ }
+ _pam_drop(response);
+
+ if (mls_enabled)
+ {
+ if (use_current_range) {
+ security_context_t mycon = NULL;
+ context_t my_context;
+
+ if (getcon(&mycon) != 0)
+ goto fail_set;
+ my_context = context_new(mycon);
+ if (my_context == NULL) {
+ freecon(mycon);
+ goto fail_set;
+ }
+ freecon(mycon);
+ if (context_range_set(new_context, context_range_get(my_context))) {
+ context_free(my_context);
+ goto fail_set;
+ }
+ context_free(my_context);
+ } else if (query_response(pamh, _("level:"), context_range_get(new_context),
+ &response, debug) == PAM_SUCCESS && response[0]) {
+ if (context_range_set(new_context, response))
+ goto fail_set;
+ }
+ _pam_drop(response);
+ }
+
+ 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));
+ if (newcon == NULL)
+ goto fail_set;
+ 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, defaultcon, newcon, debug)) {
+ pam_syslog(pamh, LOG_NOTICE, "Security context %s is not allowed for %s", defaultcon, newcon);
+
+ send_audit_message(pamh, 0, defaultcon, newcon);
+
+ free(newcon);
+ goto fail_range;
+ }
+ return newcon;
+ }
+ else {
+ send_audit_message(pamh, 0, defaultcon, 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(defaultcon);
+ } /* end while */
+
+ return NULL;
+
+ fail_set:
+ free(type);
+ _pam_drop(response);
+ context_free (new_context);
+ send_audit_message(pamh, 0, defaultcon, NULL);
+ fail_range:
+ return NULL;
+}
+
+static security_context_t
+context_from_env (pam_handle_t *pamh, security_context_t defaultcon, int env_params, int use_current_range, int debug)
+{
+ security_context_t newcon = NULL;
+ context_t new_context;
+ context_t my_context = NULL;
+ int mls_enabled = is_selinux_mls_enabled();
+ const char *env = NULL;
+ char *type = NULL;
+ int fail = 1;
+
+ if ((new_context = context_new(defaultcon)) == NULL)
+ goto fail_set;
+
+ if (env_params && (env = pam_getenv(pamh, "SELINUX_ROLE_REQUESTED")) != NULL && env[0] != '\0') {
+ if (debug)
+ pam_syslog(pamh, LOG_NOTICE, "Requested role: %s", env);
+
+ if (get_default_type(env, &type)) {
+ pam_syslog(pamh, LOG_NOTICE, "No default type for role %s", env);
+ goto fail_set;
+ } else {
+ if (context_role_set(new_context, env))
+ goto fail_set;
+ if (context_type_set(new_context, type))
+ goto fail_set;
+ }
+ }
+
+ if (mls_enabled) {
+ if ((env = pam_getenv(pamh, "SELINUX_USE_CURRENT_RANGE")) != NULL && env[0] == '1') {
+ if (debug)
+ pam_syslog(pamh, LOG_NOTICE, "SELINUX_USE_CURRENT_RANGE is set");
+ use_current_range = 1;
+ }
+
+ if (use_current_range) {
+ security_context_t mycon = NULL;
+
+ if (getcon(&mycon) != 0)
+ goto fail_set;
+ my_context = context_new(mycon);
+ if (my_context == NULL) {
+ freecon(mycon);
+ goto fail_set;
+ }
+ freecon(mycon);
+ env = context_range_get(my_context);
+ } else {
+ env = pam_getenv(pamh, "SELINUX_LEVEL_REQUESTED");
+ }
+
+ if (env != NULL && env[0] != '\0') {
+ if (debug)
+ pam_syslog(pamh, LOG_NOTICE, "Requested level: %s", env);
+ if (context_range_set(new_context, env))
+ goto fail_set;
+ }
+ }
+
+ newcon = strdup(context_str(new_context));
+ if (newcon == NULL)
+ goto fail_set;
+
+ if (debug)
+ pam_syslog(pamh, LOG_NOTICE, "Selected Security Context %s", newcon);
+
+ /* Get the string value of the context and see if it is valid. */
+ if (security_check_context(newcon)) {
+ pam_syslog(pamh, LOG_NOTICE, "Not a valid security context %s", newcon);
+
+ goto fail_set;
+ }
+
+ /* 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, defaultcon, newcon, debug)) {
+ pam_syslog(pamh, LOG_NOTICE, "Security context %s is not allowed for %s", defaultcon, newcon);
+
+ goto fail_set;
+ }
+
+ fail = 0;
+
+ fail_set:
+ free(type);
+ context_free(my_context);
+ context_free(new_context);
+ if (fail) {
+ send_audit_message(pamh, 0, defaultcon, newcon);
+ freecon(newcon);
+ newcon = NULL;
+ }
+ return newcon;
+}
+
+#define DATANAME "pam_selinux_context"
+typedef struct {
+ security_context_t exec_context;
+ security_context_t prev_exec_context;
+ security_context_t default_user_context;
+ security_context_t tty_context;
+ security_context_t prev_tty_context;
+ char *tty_path;
+} module_data_t;
+
+static void
+free_module_data(module_data_t *data)
+{
+ free(data->tty_path);
+ freecon(data->prev_tty_context);
+ freecon(data->tty_context);
+ freecon(data->default_user_context);
+ freecon(data->prev_exec_context);
+ if (data->exec_context != data->default_user_context)
+ freecon(data->exec_context);
+ memset(data, 0, sizeof(*data));
+ free(data);
+}
+
+static void
+cleanup(pam_handle_t *pamh UNUSED, void *data, int err UNUSED)
+{
+ free_module_data(data);
+}
+
+static const module_data_t *
+get_module_data(const pam_handle_t *pamh)
+{
+ const void *data;
+
+ return (pam_get_data(pamh, DATANAME, &data) == PAM_SUCCESS) ? data : NULL;
+}
+
+static const char *
+get_item(const pam_handle_t *pamh, int item_type)
+{
+ const void *item;
+
+ return (pam_get_item(pamh, item_type, &item) == PAM_SUCCESS) ? item : NULL;
+}
+
+static int
+set_exec_context(const pam_handle_t *pamh, security_context_t context)
+{
+ if (setexeccon(context) == 0)
+ return 0;
+ pam_syslog(pamh, LOG_ERR, "Setting executable context \"%s\" failed: %m",
+ context ? context : "");
+ return -1;
+}
+
+static int
+set_file_context(const pam_handle_t *pamh, security_context_t context,
+ const char *file)
+{
+ if (!file)
+ return 0;
+ if (setfilecon(file, context) == 0 || errno == ENOENT)
+ return 0;
+ pam_syslog(pamh, LOG_ERR, "Setting file context \"%s\" failed for %s: %m",
+ context ? context : "", file);
+ return -1;
+}
+
+static int
+compute_exec_context(pam_handle_t *pamh, module_data_t *data,
+ int select_context, int use_current_range,
+ int env_params, int debug)
+{
+ const char *username;
+
+#ifdef HAVE_GETSEUSER
+ const char *service;
+#endif
+ char *seuser = NULL;
+ char *level = NULL;
+ security_context_t *contextlist = NULL;
+ int num_contexts = 0;
+ const struct passwd *pwd;
+
+ if (!(username = get_item(pamh, PAM_USER))) {
+ pam_syslog(pamh, LOG_ERR, "Cannot obtain the user name");
+ return PAM_USER_UNKNOWN;
+ }
+
+ if ((pwd = pam_modutil_getpwnam(pamh, username)) != NULL) {
+ username = pwd->pw_name;
+ } /* ignore error and keep using original username */
+
+ /* compute execute context */
+#ifdef HAVE_GETSEUSER
+ if (!(service = get_item(pamh, PAM_SERVICE))) {
+ pam_syslog(pamh, LOG_ERR, "Cannot obtain the service name");
+ return PAM_SESSION_ERR;
+ }
+ if (getseuser(username, service, &seuser, &level) == 0) {
+#else
+ if (getseuserbyname(username, &seuser, &level) == 0) {
+#endif
+ 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(level);
+ }
+ if (num_contexts > 0) {
+ free(seuser);
+ data->default_user_context = strdup(contextlist[0]);
+ freeconary(contextlist);
+ if (!data->default_user_context) {
+ pam_syslog(pamh, LOG_CRIT, "Out of memory");
+ return PAM_BUF_ERR;
+ }
+
+ data->exec_context = data->default_user_context;
+ if (select_context)
+ data->exec_context = config_context(pamh, data->default_user_context,
+ use_current_range, debug);
+ else if (env_params || use_current_range)
+ data->exec_context = context_from_env(pamh, data->default_user_context,
+ env_params, use_current_range,
+ debug);
+ }
+
+ if (!data->exec_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 (getexeccon(&data->prev_exec_context) < 0)
+ data->prev_exec_context = NULL;
+
+ return PAM_SUCCESS;
+}
+
+static int
+compute_tty_context(const pam_handle_t *pamh, module_data_t *data)
+{
+ const char *tty = get_item(pamh, PAM_TTY);
+
+ if (!tty || !*tty || !strcmp(tty, "ssh") || !strncmp(tty, "NODEV", 5)) {
+ tty = ttyname(STDIN_FILENO);
+ if (!tty || !*tty)
+ tty = ttyname(STDOUT_FILENO);
+ if (!tty || !*tty)
+ tty = ttyname(STDERR_FILENO);
+ if (!tty || !*tty)
+ return PAM_SUCCESS;
+ }
+
+ if (strncmp("/dev/", tty, 5)) {
+ if (asprintf(&data->tty_path, "%s%s", "/dev/", tty) < 0)
+ data->tty_path = NULL;
+ } else {
+ data->tty_path = strdup(tty);
+ }
+
+ if (!data->tty_path) {
+ pam_syslog(pamh, LOG_CRIT, "Out of memory");
+ return PAM_BUF_ERR;
+ }
+
+ if (getfilecon(data->tty_path, &data->prev_tty_context) < 0) {
+ data->prev_tty_context = NULL;
+ if (errno == ENOENT) {
+ free(data->tty_path);
+ data->tty_path = NULL;
+ return PAM_SUCCESS;
+ }
+ pam_syslog(pamh, LOG_ERR, "Failed to get current context for %s: %m",
+ data->tty_path);
+ return (security_getenforce() == 1) ? PAM_SESSION_ERR : PAM_SUCCESS;
+ }
+
+ if (security_compute_relabel(data->exec_context, data->prev_tty_context,
+ SECCLASS_CHR_FILE, &data->tty_context)) {
+ data->tty_context = NULL;
+ pam_syslog(pamh, LOG_ERR, "Failed to compute new context for %s: %m",
+ data->tty_path);
+ freecon(data->prev_tty_context);
+ data->prev_tty_context = NULL;
+ free(data->tty_path);
+ data->tty_path = NULL;
+ return (security_getenforce() == 1) ? PAM_SESSION_ERR : PAM_SUCCESS;
+ }
+
+ return PAM_SUCCESS;
+}
+
+static int
+restore_context(const pam_handle_t *pamh, const module_data_t *data, int debug)
+{
+ int err;
+
+ if (!data) {
+ if (debug)
+ pam_syslog(pamh, LOG_NOTICE, "No context to restore");
+ return PAM_SUCCESS;
+ }
+
+ if (debug && data->tty_path)
+ pam_syslog(pamh, LOG_NOTICE,
+ "Restore file context of tty %s: [%s] -> [%s]",
+ data->tty_path,
+ data->tty_context ? data->tty_context : "",
+ data->prev_tty_context ? data->prev_tty_context : "");
+ err = set_file_context(pamh, data->prev_tty_context, data->tty_path);
+
+ if (debug)
+ pam_syslog(pamh, LOG_NOTICE, "Restore executable context: [%s] -> [%s]",
+ data->exec_context,
+ data->prev_exec_context ? data->prev_exec_context : "");
+ err |= set_exec_context(pamh, data->prev_exec_context);
+
+ if (err && security_getenforce() == 1)
+ return PAM_SESSION_ERR;
+
+ return PAM_SUCCESS;
+}
+
+static int
+set_context(pam_handle_t *pamh, const module_data_t *data,
+ int debug, int verbose)
+{
+ int rc, err;
+
+ if (debug && data->tty_path)
+ pam_syslog(pamh, LOG_NOTICE, "Set file context of tty %s: [%s] -> [%s]",
+ data->tty_path,
+ data->prev_tty_context ? data->prev_tty_context : "",
+ data->tty_context ? data->tty_context : "");
+ err = set_file_context(pamh, data->tty_context, data->tty_path);
+
+ if (debug)
+ pam_syslog(pamh, LOG_NOTICE, "Set executable context: [%s] -> [%s]",
+ data->prev_exec_context ? data->prev_exec_context : "",
+ data->exec_context);
+ rc = set_exec_context(pamh, data->exec_context);
+ err |= rc;
+
+ send_audit_message(pamh, !rc, data->default_user_context, data->exec_context);
+ if (verbose && !rc) {
+ char msg[PATH_MAX];
+
+ snprintf(msg, sizeof(msg),
+ _("Security Context %s Assigned"), data->exec_context);
+ send_text(pamh, msg, debug);
+ }
+#ifdef HAVE_SETKEYCREATECON
+ if (debug)
+ pam_syslog(pamh, LOG_NOTICE, "Set key creation context to %s",
+ data->exec_context ? data->exec_context : "");
+ rc = setkeycreatecon(data->exec_context);
+ err |= rc;
+ if (rc)
+ pam_syslog(pamh, LOG_ERR, "Setting key creation context %s failed: %m",
+ data->exec_context ? data->exec_context : "");
+ if (verbose && !rc) {
+ char msg[PATH_MAX];
+
+ snprintf(msg, sizeof(msg),
+ _("Key Creation Context %s Assigned"), data->exec_context);
+ send_text(pamh, msg, debug);
+ }
+#endif
+
+ if (err && security_getenforce() == 1)
+ return PAM_SESSION_ERR;
+
+ return PAM_SUCCESS;
+}
+
+static int
+create_context(pam_handle_t *pamh, int argc, const char **argv,
+ int debug, int verbose)
+{
+ int i;
+ int ttys = 1;
+ int select_context = 0;
+ int use_current_range = 0;
+ int env_params = 0;
+ module_data_t *data;
+
+ /* Parse arguments. */
+ for (i = 0; i < argc; i++) {
+ if (strcmp(argv[i], "nottys") == 0) {
+ ttys = 0;
+ }
+ if (strcmp(argv[i], "select_context") == 0) {
+ select_context = 1;
+ }
+ if (strcmp(argv[i], "use_current_range") == 0) {
+ use_current_range = 1;
+ }
+ if (strcmp(argv[i], "env_params") == 0) {
+ env_params = 1;
+ }
+ }
+
+ if (is_selinux_enabled() <= 0) {
+ if (debug)
+ pam_syslog(pamh, LOG_NOTICE, "SELinux is not enabled");
+ return PAM_SUCCESS;
+ }
+
+ if (select_context && env_params) {
+ pam_syslog(pamh, LOG_ERR,
+ "select_context cannot be used with env_params");
+ select_context = 0;
+ }
+
+ if (!(data = calloc(1, sizeof(*data)))) {
+ pam_syslog(pamh, LOG_CRIT, "Out of memory");
+ return PAM_BUF_ERR;
+ }
+
+ i = compute_exec_context(pamh, data, select_context, use_current_range,
+ env_params, debug);
+ if (i != PAM_SUCCESS) {
+ free_module_data(data);
+ return i;
+ }
+
+ if (!data->exec_context) {
+ free_module_data(data);
+ return (security_getenforce() == 1) ? PAM_SESSION_ERR : PAM_SUCCESS;
+ }
+
+ if (ttys && (i = compute_tty_context(pamh, data)) != PAM_SUCCESS) {
+ free_module_data(data);
+ return i;
+ }
+
+ if ((i = pam_set_data(pamh, DATANAME, data, cleanup)) != PAM_SUCCESS) {
+ pam_syslog(pamh, LOG_ERR, "Error saving context: %m");
+ free_module_data(data);
+ return i;
+ }
+
+ return set_context(pamh, data, debug, verbose);
+}
+
+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;
+}
+
+int
+pam_sm_setcred(pam_handle_t *pamh UNUSED, int flags UNUSED,
+ int argc UNUSED, const char **argv UNUSED)
+{
+ return PAM_SUCCESS;
+}
+
+int
+pam_sm_open_session(pam_handle_t *pamh, int flags UNUSED,
+ int argc, const char **argv)
+{
+ const module_data_t *data;
+ int i, debug = 0, verbose = 0, close_session = 0, restore = 0;
+
+ /* Parse arguments. */
+ for (i = 0; i < argc; i++) {
+ if (strcmp(argv[i], "debug") == 0) {
+ debug = 1;
+ }
+ if (strcmp(argv[i], "verbose") == 0) {
+ verbose = 1;
+ }
+ if (strcmp(argv[i], "close") == 0) {
+ close_session = 1;
+ }
+ if (strcmp(argv[i], "restore") == 0) {
+ restore = 1;
+ }
+ }
+
+ if (debug)
+ pam_syslog(pamh, LOG_NOTICE, "Open Session");
+
+ /* Is this module supposed to execute close_session only? */
+ if (close_session)
+ return PAM_SUCCESS;
+
+ data = get_module_data(pamh);
+
+ /* Is this module supposed only to restore original context? */
+ if (restore)
+ return restore_context(pamh, data, debug);
+
+ /* If there is a saved context, this module is supposed to set it again. */
+ return data ? set_context(pamh, data, debug, verbose) :
+ create_context(pamh, argc, argv, debug, verbose);
+}
+
+int
+pam_sm_close_session(pam_handle_t *pamh, int flags UNUSED,
+ int argc, const char **argv)
+{
+ int i, debug = 0, open_session = 0;
+
+ /* 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");
+
+ /* Is this module supposed to execute open_session only? */
+ if (open_session)
+ return PAM_SUCCESS;
+
+ /* Restore original context. */
+ return restore_context(pamh, get_module_data(pamh), debug);
+}
diff --git a/modules/pam_selinux/pam_selinux_check.8 b/modules/pam_selinux/pam_selinux_check.8
new file mode 100644
index 0000000..34f578d
--- /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 0000000..30526d3
--- /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 0000000..14c3d82
--- /dev/null
+++ b/modules/pam_selinux/tst-pam_selinux
@@ -0,0 +1,2 @@
+#!/bin/sh
+../../tests/tst-dlopen .libs/pam_selinux.so
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-03 19:09:54 +0000