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-rw-r--r--modules/pam_motd/Makefile.am33
-rw-r--r--modules/pam_motd/Makefile.in1150
-rw-r--r--modules/pam_motd/README82
-rw-r--r--modules/pam_motd/README.xml41
-rw-r--r--modules/pam_motd/pam_motd.8195
-rw-r--r--modules/pam_motd/pam_motd.8.xml215
-rw-r--r--modules/pam_motd/pam_motd.c445
-rwxr-xr-xmodules/pam_motd/tst-pam_motd2
8 files changed, 2163 insertions, 0 deletions
diff --git a/modules/pam_motd/Makefile.am b/modules/pam_motd/Makefile.am
new file mode 100644
index 0000000..956dad2
--- /dev/null
+++ b/modules/pam_motd/Makefile.am
@@ -0,0 +1,33 @@
+#
+# Copyright (c) 2005, 2006, 2009 Thorsten Kukuk <kukuk@suse.de>
+#
+
+CLEANFILES = *~
+MAINTAINERCLEANFILES = $(MANS) README
+
+EXTRA_DIST = $(XMLS)
+
+if HAVE_DOC
+dist_man_MANS = pam_motd.8
+endif
+XMLS = README.xml pam_motd.8.xml
+dist_check_SCRIPTS = tst-pam_motd
+TESTS = $(dist_check_SCRIPTS)
+
+securelibdir = $(SECUREDIR)
+secureconfdir = $(SCONFIGDIR)
+
+AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include \
+ $(WARN_CFLAGS)
+AM_LDFLAGS = -no-undefined -avoid-version -module
+if HAVE_VERSIONING
+ AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map
+endif
+
+securelib_LTLIBRARIES = pam_motd.la
+pam_motd_la_LIBADD = $(top_builddir)/libpam/libpam.la
+
+if ENABLE_REGENERATE_MAN
+dist_noinst_DATA = README
+-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 0000000..14ab6bb
--- /dev/null
+++ b/modules/pam_motd/Makefile.in
@@ -0,0 +1,1150 @@
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+
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+# with or without modifications, as long as this notice is preserved.
+
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+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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+ cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+ else \
+ test -f "$(distdir)/$$file" \
+ || cp -p $$d/$$file "$(distdir)/$$file" \
+ || exit 1; \
+ fi; \
+ done
+check-am: all-am
+ $(MAKE) $(AM_MAKEFLAGS) $(dist_check_SCRIPTS)
+ $(MAKE) $(AM_MAKEFLAGS) check-TESTS
+check: check-am
+all-am: Makefile $(LTLIBRARIES) $(MANS) $(DATA)
+installdirs:
+ for dir in "$(DESTDIR)$(securelibdir)" "$(DESTDIR)$(man8dir)"; do \
+ test -z "$$dir" || $(MKDIR_P) "$$dir"; \
+ done
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+ $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
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+ install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
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+ fi
+mostlyclean-generic:
+ -test -z "$(TEST_LOGS)" || rm -f $(TEST_LOGS)
+ -test -z "$(TEST_LOGS:.log=.trs)" || rm -f $(TEST_LOGS:.log=.trs)
+ -test -z "$(TEST_SUITE_LOG)" || rm -f $(TEST_SUITE_LOG)
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+clean-generic:
+ -test -z "$(CLEANFILES)" || rm -f $(CLEANFILES)
+
+distclean-generic:
+ -test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+ -test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+ @echo "This command is intended for maintainers to use"
+ @echo "it deletes files that may require special tools to rebuild."
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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_motd/README b/modules/pam_motd/README
new file mode 100644
index 0000000..01bc64e
--- /dev/null
+++ b/modules/pam_motd/README
@@ -0,0 +1,82 @@
+pam_motd — Display the motd file
+
+━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+
+DESCRIPTION
+
+pam_motd is a PAM module that can be used to display arbitrary motd (message of
+the day) files after a successful login. By default, pam_motd shows files in
+the following locations:
+
+/etc/motd
+/run/motd
+/usr/lib/motd
+/etc/motd.d/
+/run/motd.d/
+/usr/lib/motd.d/
+
+Each message size is limited to 64KB.
+
+If /etc/motd does not exist, then /run/motd is shown. If /run/motd does not
+exist, then /usr/lib/motd is shown.
+
+Similar overriding behavior applies to the directories. Files in /etc/motd.d/
+override files with the same name in /run/motd.d/ and /usr/lib/motd.d/. Files
+in /run/motd.d/ override files with the same name in /usr/lib/motd.d/.
+
+Files in the directories listed above are displayed in lexicographic order by
+name. Moreover, the files are filtered by reading them with the credentials of
+the target user authenticating on the system.
+
+To silence a message, a symbolic link with target /dev/null may be placed in /
+etc/motd.d with the same filename as the message to be silenced. Example:
+Creating a symbolic link as follows silences /usr/lib/motd.d/my_motd.
+
+ln -s /dev/null /etc/motd.d/my_motd
+
+The MOTD_SHOWN=pam environment variable is set after showing the motd files,
+even when all of them were silenced using symbolic links.
+
+OPTIONS
+
+motd=/path/filename
+
+ The /path/filename file is displayed as message of the day. Multiple paths
+ to try can be specified as a colon-separated list. By default this option
+ is set to /etc/motd:/run/motd:/usr/lib/motd.
+
+motd_dir=/path/dirname.d
+
+ The /path/dirname.d directory is scanned and each file contained inside of
+ it is displayed. Multiple directories to scan can be specified as a
+ colon-separated list. By default this option is set to /etc/motd.d:/run/
+ motd.d:/usr/lib/motd.d.
+
+When no options are given, the default behavior applies for both options.
+Specifying either option (or both) will disable the default behavior for both
+options.
+
+EXAMPLES
+
+The suggested usage for /etc/pam.d/login is:
+
+session optional pam_motd.so
+
+
+To use a motd file from a different location:
+
+session optional pam_motd.so motd=/elsewhere/motd
+
+
+To use a motd file from elsewhere, along with a corresponding .d directory:
+
+session optional pam_motd.so motd=/elsewhere/motd motd_dir=/elsewhere/motd.d
+
+
+AUTHOR
+
+pam_motd was written by Ben Collins <bcollins@debian.org>.
+
+The motd_dir= option was added by Allison Karlitskaya
+<allison.karlitskaya@redhat.com>.
+
diff --git a/modules/pam_motd/README.xml b/modules/pam_motd/README.xml
new file mode 100644
index 0000000..779e4d1
--- /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 0000000..a211d6e
--- /dev/null
+++ b/modules/pam_motd/pam_motd.8
@@ -0,0 +1,195 @@
+'\" t
+.\" Title: pam_motd
+.\" Author: [see the "AUTHOR" section]
+.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
+.\" Date: 09/03/2021
+.\" Manual: Linux-PAM Manual
+.\" Source: Linux-PAM Manual
+.\" Language: English
+.\"
+.TH "PAM_MOTD" "8" "09/03/2021" "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_motd \- Display the motd file
+.SH "SYNOPSIS"
+.HP \w'\fBpam_motd\&.so\fR\ 'u
+\fBpam_motd\&.so\fR [motd=\fI/path/filename\fR] [motd_dir=\fI/path/dirname\&.d\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 successful login\&. By default, pam_motd shows files in the following locations:
+.PP
+.RS 4
+/etc/motd
+.RE
+.RS 4
+/run/motd
+.RE
+.RS 4
+/usr/lib/motd
+.RE
+.RS 4
+/etc/motd\&.d/
+.RE
+.RS 4
+/run/motd\&.d/
+.RE
+.RS 4
+/usr/lib/motd\&.d/
+.RE
+.PP
+Each message size is limited to 64KB\&.
+.PP
+If
+/etc/motd
+does not exist, then
+/run/motd
+is shown\&. If
+/run/motd
+does not exist, then
+/usr/lib/motd
+is shown\&.
+.PP
+Similar overriding behavior applies to the directories\&. Files in
+/etc/motd\&.d/
+override files with the same name in
+/run/motd\&.d/
+and
+/usr/lib/motd\&.d/\&. Files in
+/run/motd\&.d/
+override files with the same name in
+/usr/lib/motd\&.d/\&.
+.PP
+Files in the directories listed above are displayed in lexicographic order by name\&. Moreover, the files are filtered by reading them with the credentials of the target user authenticating on the system\&.
+.PP
+To silence a message, a symbolic link with target
+/dev/null
+may be placed in
+/etc/motd\&.d
+with the same filename as the message to be silenced\&. Example: Creating a symbolic link as follows silences
+/usr/lib/motd\&.d/my_motd\&.
+.PP
+\fBln \-s /dev/null /etc/motd\&.d/my_motd\fR
+.PP
+The
+\fBMOTD_SHOWN=pam\fR
+environment variable is set after showing the motd files, even when all of them were silenced using symbolic links\&.
+.SH "OPTIONS"
+.PP
+\fBmotd=\fR\fB\fI/path/filename\fR\fR
+.RS 4
+The
+/path/filename
+file is displayed as message of the day\&. Multiple paths to try can be specified as a colon\-separated list\&. By default this option is set to
+/etc/motd:/run/motd:/usr/lib/motd\&.
+.RE
+.PP
+\fBmotd_dir=\fR\fB\fI/path/dirname\&.d\fR\fR
+.RS 4
+The
+/path/dirname\&.d
+directory is scanned and each file contained inside of it is displayed\&. Multiple directories to scan can be specified as a colon\-separated list\&. By default this option is set to
+/etc/motd\&.d:/run/motd\&.d:/usr/lib/motd\&.d\&.
+.RE
+.PP
+When no options are given, the default behavior applies for both options\&. Specifying either option (or both) will disable the default behavior for both options\&.
+.SH "MODULE TYPES PROVIDED"
+.PP
+Only the
+\fBsession\fR
+module type is provided\&.
+.SH "RETURN VALUES"
+.PP
+PAM_ABORT
+.RS 4
+Not all relevant data or options could be obtained\&.
+.RE
+.PP
+PAM_BUF_ERR
+.RS 4
+Memory buffer error\&.
+.RE
+.PP
+PAM_IGNORE
+.RS 4
+This is the default return value of this module\&.
+.RE
+.SH "EXAMPLES"
+.PP
+The suggested usage for
+/etc/pam\&.d/login
+is:
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+session optional pam_motd\&.so
+
+.fi
+.if n \{\
+.RE
+.\}
+.PP
+To use a
+motd
+file from a different location:
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+session optional pam_motd\&.so motd=/elsewhere/motd
+
+.fi
+.if n \{\
+.RE
+.\}
+.PP
+To use a
+motd
+file from elsewhere, along with a corresponding
+\&.d
+directory:
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+session optional pam_motd\&.so motd=/elsewhere/motd motd_dir=/elsewhere/motd\&.d
+
+.fi
+.if n \{\
+.RE
+.\}
+.sp
+.SH "SEE ALSO"
+.PP
+\fBmotd\fR(5),
+\fBpam.conf\fR(5),
+\fBpam.d\fR(5),
+\fBpam\fR(8)
+.SH "AUTHOR"
+.PP
+pam_motd was written by Ben Collins <bcollins@debian\&.org>\&.
+.PP
+The
+\fBmotd_dir=\fR
+option was added by Allison Karlitskaya <allison\&.karlitskaya@redhat\&.com>\&.
diff --git a/modules/pam_motd/pam_motd.8.xml b/modules/pam_motd/pam_motd.8.xml
new file mode 100644
index 0000000..0afd4c9
--- /dev/null
+++ b/modules/pam_motd/pam_motd.8.xml
@@ -0,0 +1,215 @@
+<?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>
+ <arg choice="opt">
+ motd_dir=<replaceable>/path/dirname.d</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 successful
+ login. By default, pam_motd shows files in the
+ following locations:
+ </para>
+ <para>
+ <simplelist type='vert'>
+ <member><filename>/etc/motd</filename></member>
+ <member><filename>/run/motd</filename></member>
+ <member><filename>/usr/lib/motd</filename></member>
+ <member><filename>/etc/motd.d/</filename></member>
+ <member><filename>/run/motd.d/</filename></member>
+ <member><filename>/usr/lib/motd.d/</filename></member>
+ </simplelist>
+ </para>
+ <para>
+ Each message size is limited to 64KB.
+ </para>
+ <para>
+ If <filename>/etc/motd</filename> does not exist,
+ then <filename>/run/motd</filename> is shown. If
+ <filename>/run/motd</filename> does not exist, then
+ <filename>/usr/lib/motd</filename> is shown.
+ </para>
+ <para>
+ Similar overriding behavior applies to the directories.
+ Files in <filename>/etc/motd.d/</filename> override files
+ with the same name in <filename>/run/motd.d/</filename> and
+ <filename>/usr/lib/motd.d/</filename>. Files in <filename>/run/motd.d/</filename>
+ override files with the same name in <filename>/usr/lib/motd.d/</filename>.
+ </para>
+ <para>
+ Files in the directories listed above are displayed in lexicographic
+ order by name. Moreover, the files are filtered by reading them with the
+ credentials of the target user authenticating on the system.
+ </para>
+ <para>
+ To silence a message,
+ a symbolic link with target <filename>/dev/null</filename>
+ may be placed in <filename>/etc/motd.d</filename> with
+ the same filename as the message to be silenced. Example:
+ Creating a symbolic link as follows silences <filename>/usr/lib/motd.d/my_motd</filename>.
+ </para>
+ <para>
+ <command>ln -s /dev/null /etc/motd.d/my_motd</command>
+ </para>
+ <para>
+ The <emphasis remap='B'>MOTD_SHOWN=pam</emphasis> environment variable
+ is set after showing the motd files, even when all of them were silenced
+ using symbolic links.
+ </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. Multiple paths to try can be
+ specified as a colon-separated list. By default this option
+ is set to <filename>/etc/motd:/run/motd:/usr/lib/motd</filename>.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>motd_dir=<replaceable>/path/dirname.d</replaceable></option>
+ </term>
+ <listitem>
+ <para>
+ The <filename>/path/dirname.d</filename> directory is scanned
+ and each file contained inside of it is displayed. Multiple
+ directories to scan can be specified as a colon-separated list.
+ By default this option is set to <filename>/etc/motd.d:/run/motd.d:/usr/lib/motd.d</filename>.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ <para>
+ When no options are given, the default behavior applies for both
+ options. Specifying either option (or both) will disable the
+ default behavior for both options.
+ </para>
+ </refsect1>
+
+ <refsect1 id="pam_motd-types">
+ <title>MODULE TYPES PROVIDED</title>
+ <para>
+ Only the <option>session</option> module type is provided.
+ </para>
+ </refsect1>
+
+ <refsect1 id='pam_motd-return_values'>
+ <title>RETURN VALUES</title>
+ <variablelist>
+ <varlistentry>
+ <term>PAM_ABORT</term>
+ <listitem>
+ <para>
+ Not all relevant data or options could be obtained.
+ </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 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
+ </programlisting>
+ </para>
+ <para>
+ To use a <filename>motd</filename> file from a different location:
+ <programlisting>
+session optional pam_motd.so motd=/elsewhere/motd
+ </programlisting>
+ </para>
+ <para>
+ To use a <filename>motd</filename> file from elsewhere, along with a
+ corresponding <filename>.d</filename> directory:
+ <programlisting>
+session optional pam_motd.so motd=/elsewhere/motd motd_dir=/elsewhere/motd.d
+ </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>5</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 &lt;bcollins@debian.org&gt;.
+ </para>
+ <para>
+ The <option>motd_dir=</option> option was added by
+ Allison Karlitskaya &lt;allison.karlitskaya@redhat.com&gt;.
+ </para>
+ </refsect1>
+
+</refentry>
diff --git a/modules/pam_motd/pam_motd.c b/modules/pam_motd/pam_motd.c
new file mode 100644
index 0000000..6ac8cba
--- /dev/null
+++ b/modules/pam_motd/pam_motd.c
@@ -0,0 +1,445 @@
+/*
+ * pam_motd module
+ *
+ * Modified for pam_motd by Ben Collins <bcollins@debian.org>
+ * 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 <dirent.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <pwd.h>
+#include <syslog.h>
+#include <errno.h>
+
+#include <security/_pam_macros.h>
+#include <security/pam_ext.h>
+#include <security/pam_modules.h>
+#include <security/pam_modutil.h>
+#include "pam_inline.h"
+
+#define DEFAULT_MOTD "/etc/motd:/run/motd:/usr/lib/motd"
+#define DEFAULT_MOTD_D "/etc/motd.d:/run/motd.d:/usr/lib/motd.d"
+
+/* --- session management functions (only) --- */
+
+int
+pam_sm_close_session (pam_handle_t *pamh UNUSED, int flags UNUSED,
+ int argc UNUSED, const char **argv UNUSED)
+{
+ return PAM_IGNORE;
+}
+
+static const char default_motd[] = DEFAULT_MOTD;
+static const char default_motd_dir[] = DEFAULT_MOTD_D;
+
+static void try_to_display_fd(pam_handle_t *pamh, int fd)
+{
+ struct stat st;
+ char *mtmp = NULL;
+
+ /* fill in message buffer with contents of motd */
+ if ((fstat(fd, &st) < 0) || !st.st_size || st.st_size > 0x10000)
+ return;
+
+ if (!(mtmp = malloc(st.st_size+1)))
+ return;
+
+ if (pam_modutil_read(fd, mtmp, st.st_size) == st.st_size) {
+ if (mtmp[st.st_size-1] == '\n')
+ mtmp[st.st_size-1] = '\0';
+ else
+ mtmp[st.st_size] = '\0';
+
+ pam_info (pamh, "%s", mtmp);
+ }
+
+ _pam_drop(mtmp);
+}
+
+/*
+ * Split a DELIM-separated string ARG into an array.
+ * Outputs a newly allocated array of strings OUT_ARG_SPLIT
+ * and the number of strings OUT_NUM_STRS.
+ * Returns 0 in case of error, 1 in case of success.
+ */
+static int pam_split_string(const pam_handle_t *pamh, char *arg, char delim,
+ char ***out_arg_split, unsigned int *out_num_strs)
+{
+ char *arg_extracted = NULL;
+ const char *arg_ptr = arg;
+ char **arg_split = NULL;
+ char delim_str[2];
+ unsigned int i = 0;
+ unsigned int num_strs = 0;
+ int retval = 0;
+
+ delim_str[0] = delim;
+ delim_str[1] = '\0';
+
+ if (arg == NULL) {
+ goto out;
+ }
+
+ while (arg_ptr != NULL) {
+ num_strs++;
+ arg_ptr = strchr(arg_ptr + sizeof(const char), delim);
+ }
+
+ arg_split = calloc(num_strs, sizeof(*arg_split));
+ if (arg_split == NULL) {
+ pam_syslog(pamh, LOG_CRIT, "failed to allocate string array");
+ goto out;
+ }
+
+ arg_extracted = strtok_r(arg, delim_str, &arg);
+ while (arg_extracted != NULL && i < num_strs) {
+ arg_split[i++] = arg_extracted;
+ arg_extracted = strtok_r(NULL, delim_str, &arg);
+ }
+
+ retval = 1;
+
+ out:
+ *out_num_strs = num_strs;
+ *out_arg_split = arg_split;
+
+ return retval;
+}
+
+/* Join A_STR and B_STR, inserting a "/" between them if one is not already trailing
+ * in A_STR or beginning B_STR. A pointer to a newly allocated string holding the
+ * joined string is returned in STRP_OUT.
+ * Returns -1 in case of error, or the number of bytes in the joined string in
+ * case of success. */
+static int join_dir_strings(char **strp_out, const char *a_str, const char *b_str)
+{
+ int has_sep = 0;
+ int retval = -1;
+ char *join_strp = NULL;
+
+ if (strp_out == NULL || a_str == NULL || b_str == NULL) {
+ goto out;
+ }
+ if (strlen(a_str) == 0) {
+ goto out;
+ }
+
+ has_sep = (a_str[strlen(a_str) - 1] == '/') || (b_str[0] == '/');
+
+ retval = asprintf(&join_strp, "%s%s%s", a_str,
+ (has_sep == 1) ? "" : "/", b_str);
+
+ if (retval < 0) {
+ goto out;
+ }
+
+ *strp_out = join_strp;
+
+ out:
+ return retval;
+}
+
+static int compare_strings(const void *a, const void *b)
+{
+ const char *a_str = *(const char * const *)a;
+ const char *b_str = *(const char * const *)b;
+
+ if (a_str == NULL && b_str == NULL) {
+ return 0;
+ }
+ else if (a_str == NULL) {
+ return -1;
+ }
+ else if (b_str == NULL) {
+ return 1;
+ }
+ else {
+ return strcmp(a_str, b_str);
+ }
+}
+
+static int filter_dirents(const struct dirent *d)
+{
+ return (d->d_type == DT_REG || d->d_type == DT_LNK);
+}
+
+static void try_to_display_directories_with_overrides(pam_handle_t *pamh,
+ char **motd_dir_path_split, unsigned int num_motd_dirs, int report_missing)
+{
+ struct dirent ***dirscans = NULL;
+ unsigned int *dirscans_sizes = NULL;
+ unsigned int dirscans_size_total = 0;
+ char **dirnames_all = NULL;
+ unsigned int i;
+ int i_dirnames = 0;
+
+ if (pamh == NULL || motd_dir_path_split == NULL) {
+ goto out;
+ }
+ if (num_motd_dirs < 1) {
+ goto out;
+ }
+
+ if ((dirscans = calloc(num_motd_dirs, sizeof(*dirscans))) == NULL) {
+ pam_syslog(pamh, LOG_CRIT, "failed to allocate dirent arrays");
+ goto out;
+ }
+ if ((dirscans_sizes = calloc(num_motd_dirs, sizeof(*dirscans_sizes))) == NULL) {
+ pam_syslog(pamh, LOG_CRIT, "failed to allocate dirent array sizes");
+ goto out;
+ }
+
+ for (i = 0; i < num_motd_dirs; i++) {
+ int rv;
+ rv = scandir(motd_dir_path_split[i], &(dirscans[i]),
+ filter_dirents, alphasort);
+ if (rv < 0) {
+ if (errno != ENOENT || report_missing) {
+ pam_syslog(pamh, LOG_ERR, "error scanning directory %s: %m",
+ motd_dir_path_split[i]);
+ }
+ } else {
+ dirscans_sizes[i] = rv;
+ }
+ dirscans_size_total += dirscans_sizes[i];
+ }
+
+ if (dirscans_size_total == 0)
+ goto out;
+
+ /* Allocate space for all file names found in the directories, including duplicates. */
+ if ((dirnames_all = calloc(dirscans_size_total, sizeof(*dirnames_all))) == NULL) {
+ pam_syslog(pamh, LOG_CRIT, "failed to allocate dirname array");
+ goto out;
+ }
+
+ for (i = 0; i < num_motd_dirs; i++) {
+ unsigned int j;
+
+ for (j = 0; j < dirscans_sizes[i]; j++) {
+ dirnames_all[i_dirnames] = dirscans[i][j]->d_name;
+ i_dirnames++;
+ }
+ }
+
+ qsort(dirnames_all, dirscans_size_total,
+ sizeof(const char *), compare_strings);
+
+ for (i = 0; i < dirscans_size_total; i++) {
+ unsigned int j;
+
+ if (dirnames_all[i] == NULL) {
+ continue;
+ }
+
+ /* Skip duplicate file names. */
+ if (i > 0 && strcmp(dirnames_all[i], dirnames_all[i - 1]) == 0) {
+ continue;
+ }
+
+ for (j = 0; j < num_motd_dirs; j++) {
+ char *abs_path = NULL;
+ int fd;
+
+ if (join_dir_strings(&abs_path, motd_dir_path_split[j],
+ dirnames_all[i]) < 0 || abs_path == NULL) {
+ continue;
+ }
+
+ fd = open(abs_path, O_RDONLY, 0);
+ _pam_drop(abs_path);
+
+ if (fd >= 0) {
+ try_to_display_fd(pamh, fd);
+ close(fd);
+
+ /* We displayed a file, skip to the next file name. */
+ break;
+ }
+ }
+ }
+
+ out:
+ _pam_drop(dirnames_all);
+ if (dirscans_sizes != NULL) {
+ for (i = 0; i < num_motd_dirs; i++) {
+ unsigned int j;
+
+ for (j = 0; j < dirscans_sizes[i]; j++)
+ _pam_drop(dirscans[i][j]);
+ _pam_drop(dirscans[i]);
+ }
+ _pam_drop(dirscans_sizes);
+ }
+ _pam_drop(dirscans);
+}
+
+static int drop_privileges(pam_handle_t *pamh, struct pam_modutil_privs *privs)
+{
+ struct passwd *pw;
+ const char *username;
+ int retval;
+
+ retval = pam_get_user(pamh, &username, NULL);
+
+ if (retval == PAM_SUCCESS) {
+ pw = pam_modutil_getpwnam (pamh, username);
+ } else {
+ return PAM_SESSION_ERR;
+ }
+
+ if (pw == NULL || pam_modutil_drop_priv(pamh, privs, pw)) {
+ return PAM_SESSION_ERR;
+ }
+
+ return PAM_SUCCESS;
+}
+
+static int try_to_display(pam_handle_t *pamh, char **motd_path_split,
+ unsigned int num_motd_paths,
+ char **motd_dir_path_split,
+ unsigned int num_motd_dir_paths, int report_missing)
+{
+ PAM_MODUTIL_DEF_PRIVS(privs);
+
+ if (drop_privileges(pamh, &privs) != PAM_SUCCESS) {
+ pam_syslog(pamh, LOG_ERR, "Unable to drop privileges");
+ return PAM_SESSION_ERR;
+ }
+
+ if (motd_path_split != NULL) {
+ unsigned int i;
+
+ for (i = 0; i < num_motd_paths; i++) {
+ int fd = open(motd_path_split[i], O_RDONLY, 0);
+
+ if (fd >= 0) {
+ try_to_display_fd(pamh, fd);
+ close(fd);
+
+ /* We found and displayed a file,
+ * move onto next filename.
+ */
+ break;
+ }
+ }
+ }
+
+ if (motd_dir_path_split != NULL) {
+ try_to_display_directories_with_overrides(pamh,
+ motd_dir_path_split,
+ num_motd_dir_paths,
+ report_missing);
+ }
+
+ if (pam_modutil_regain_priv(pamh, &privs)) {
+ pam_syslog(pamh, LOG_ERR, "Unable to regain privileges");
+ return PAM_SESSION_ERR;
+ }
+
+ return PAM_SUCCESS;
+}
+
+int pam_sm_open_session(pam_handle_t *pamh, int flags,
+ int argc, const char **argv)
+{
+ int retval = PAM_IGNORE;
+ const char *motd_path = NULL;
+ char *motd_path_copy = NULL;
+ unsigned int num_motd_paths = 0;
+ char **motd_path_split = NULL;
+ const char *motd_dir_path = NULL;
+ char *motd_dir_path_copy = NULL;
+ unsigned int num_motd_dir_paths = 0;
+ char **motd_dir_path_split = NULL;
+ int report_missing;
+
+ if (flags & PAM_SILENT) {
+ return retval;
+ }
+
+ for (; argc-- > 0; ++argv) {
+ const char *str;
+ if ((str = pam_str_skip_prefix(*argv, "motd=")) != NULL) {
+
+ motd_path = str;
+ 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 if ((str = pam_str_skip_prefix(*argv, "motd_dir=")) != NULL) {
+
+ motd_dir_path = str;
+ if (*motd_dir_path != '\0') {
+ D(("set motd.d path: %s", motd_dir_path));
+ } else {
+ motd_dir_path = NULL;
+ pam_syslog(pamh, LOG_ERR,
+ "motd_dir= specification missing argument - ignored");
+ }
+ }
+ else
+ pam_syslog(pamh, LOG_ERR, "unknown option: %s", *argv);
+ }
+
+ if (motd_path == NULL && motd_dir_path == NULL) {
+ motd_path = default_motd;
+ motd_dir_path = default_motd_dir;
+ report_missing = 0;
+ } else {
+ report_missing = 1;
+ }
+
+ if (motd_path != NULL) {
+ motd_path_copy = strdup(motd_path);
+ }
+
+ if (motd_path_copy != NULL) {
+ if (pam_split_string(pamh, motd_path_copy, ':',
+ &motd_path_split, &num_motd_paths) == 0) {
+ goto out;
+ }
+ }
+
+ if (motd_dir_path != NULL) {
+ motd_dir_path_copy = strdup(motd_dir_path);
+ }
+
+ if (motd_dir_path_copy != NULL) {
+ if (pam_split_string(pamh, motd_dir_path_copy, ':',
+ &motd_dir_path_split, &num_motd_dir_paths) == 0) {
+ goto out;
+ }
+ }
+
+ retval = try_to_display(pamh, motd_path_split, num_motd_paths,
+ motd_dir_path_split, num_motd_dir_paths,
+ report_missing);
+
+ out:
+ _pam_drop(motd_path_copy);
+ _pam_drop(motd_path_split);
+ _pam_drop(motd_dir_path_copy);
+ _pam_drop(motd_dir_path_split);
+
+ if (retval == PAM_SUCCESS) {
+ retval = pam_putenv(pamh, "MOTD_SHOWN=pam");
+ return retval == PAM_SUCCESS ? PAM_IGNORE : retval;
+ } else {
+ return retval;
+ }
+}
+
+/* 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 0000000..155e230
--- /dev/null
+++ b/modules/pam_motd/tst-pam_motd
@@ -0,0 +1,2 @@
+#!/bin/sh
+../../tests/tst-dlopen .libs/pam_motd.so
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-22 17:45:40 +0000