Adding upstream version 1.3.1.upstream/1.3.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

8 files changed, 2559 insertions, 0 deletions

diff --git a/modules/pam_xauth/Makefile.am b/modules/pam_xauth/Makefile.am
new file mode 100644
index 0000000..0735d13
--- /dev/null
+++ b/modules/pam_xauth/Makefile.am
@@ -0,0 +1,31 @@
+#
+# Copyright (c) 2005, 2006, 2009 Thorsten Kukuk <kukuk@suse.de>
+#
+
+CLEANFILES = *~
+MAINTAINERCLEANFILES = $(MANS) README
+
+EXTRA_DIST = README ${MANS} $(XMLS) tst-pam_xauth
+
+man_MANS = pam_xauth.8
+XMLS = README.xml pam_xauth.8.xml
+
+TESTS = tst-pam_xauth
+
+securelibdir = $(SECUREDIR)
+secureconfdir = $(SCONFIGDIR)
+
+AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include
+AM_LDFLAGS = -no-undefined -avoid-version -module
+if HAVE_VERSIONING
+  AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map
+endif
+
+securelib_LTLIBRARIES = pam_xauth.la
+pam_xauth_la_LIBADD = $(top_builddir)/libpam/libpam.la @LIBSELINUX@
+
+if ENABLE_REGENERATE_MAN
+noinst_DATA = README
+README: pam_xauth.8.xml
+-include $(top_srcdir)/Make.xml.rules
+endif
diff --git a/modules/pam_xauth/Makefile.in b/modules/pam_xauth/Makefile.in
new file mode 100644
index 0000000..be7fbe6
--- /dev/null
+++ b/modules/pam_xauth/Makefile.in
@@ -0,0 +1,1114 @@
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+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --gnu modules/pam_xauth/Makefile
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+	    list2="$$list2 $$p"; \
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+	done; \
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+	  echo " $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(INSTALL) $(INSTALL_STRIP_FLAG) $$list2 '$(DESTDIR)$(securelibdir)'"; \
+	  $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(INSTALL) $(INSTALL_STRIP_FLAG) $$list2 "$(DESTDIR)$(securelibdir)"; \
+	}
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+	  $(am__strip_dir) \
+	  echo " $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=uninstall rm -f '$(DESTDIR)$(securelibdir)/$$f'"; \
+	  $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=uninstall rm -f "$(DESTDIR)$(securelibdir)/$$f"; \
+	done
+
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+	@list='$(securelib_LTLIBRARIES)'; \
+	locs=`for p in $$list; do echo $$p; done | \
+	      sed 's|^[^/]*$$|.|; s|/[^/]*$$||; s|$$|/so_locations|' | \
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+	test -z "$$locs" || { \
+	  echo rm -f $${locs}; \
+	  rm -f $${locs}; \
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+	$(AM_V_CCLD)$(LINK) -rpath $(securelibdir) $(pam_xauth_la_OBJECTS) $(pam_xauth_la_LIBADD) $(LIBS)
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+# Recover from deleted '.trs' file; this should ensure that
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+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
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diff --git a/modules/pam_xauth/README b/modules/pam_xauth/README
new file mode 100644
index 0000000..a32822d
--- /dev/null
+++ b/modules/pam_xauth/README
@@ -0,0 +1,90 @@
+pam_xauth — PAM module to forward xauth keys between users
+
+━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+
+DESCRIPTION
+
+The pam_xauth PAM module is designed to forward xauth keys (sometimes referred
+to as "cookies") between users.
+
+Without pam_xauth, when xauth is enabled and a user uses the su(1) command to
+assume another user's privileges, that user is no longer able to access the
+original user's X display because the new user does not have the key needed to
+access the display. pam_xauth solves the problem by forwarding the key from the
+user running su (the source user) to the user whose identity the source user is
+assuming (the target user) when the session is created, and destroying the key
+when the session is torn down.
+
+This means, for example, that when you run su(1) from an xterm session, you
+will be able to run X programs without explicitly dealing with the xauth(1)
+xauth command or ~/.Xauthority files.
+
+pam_xauth will only forward keys if xauth can list a key connected to the
+$DISPLAY environment variable.
+
+Primitive access control is provided by ~/.xauth/export in the invoking user's
+home directory and ~/.xauth/import in the target user's home directory.
+
+If a user has a ~/.xauth/import file, the user will only receive cookies from
+users listed in the file. If there is no ~/.xauth/import file, the user will
+accept cookies from any other user.
+
+If a user has a .xauth/export file, the user will only forward cookies to users
+listed in the file. If there is no ~/.xauth/export file, and the invoking user
+is not root, the user will forward cookies to any other user. If there is no ~
+/.xauth/export file, and the invoking user is root, the user will not forward
+cookies to other users.
+
+Both the import and export files support wildcards (such as *). Both the import
+and export files can be empty, signifying that no users are allowed.
+
+OPTIONS
+
+debug
+
+    Print debug information.
+
+xauthpath=/path/to/xauth
+
+    Specify the path the xauth program (it is expected in /usr/X11R6/bin/xauth,
+    /usr/bin/xauth, or /usr/bin/X11/xauth by default).
+
+systemuser=UID
+
+    Specify the highest UID which will be assumed to belong to a "system" user.
+    pam_xauth will refuse to forward credentials to users with UID less than or
+    equal to this number, except for root and the "targetuser", if specified.
+
+targetuser=UID
+
+    Specify a single target UID which is exempt from the systemuser check.
+
+EXAMPLES
+
+Add the following line to /etc/pam.d/su to forward xauth keys between users
+when calling su:
+
+session  optional  pam_xauth.so
+
+
+IMPLEMENTATION DETAILS
+
+pam_xauth will work only if it is used from a setuid application in which the
+getuid() call returns the id of the user running the application, and for which
+PAM can supply the name of the account that the user is attempting to assume.
+The typical application of this type is su(1). The application must call both
+pam_open_session() and pam_close_session() with the ruid set to the uid of the
+calling user and the euid set to root, and must have provided as the PAM_USER
+item the name of the target user.
+
+pam_xauth calls xauth(1) as the source user to extract the key for $DISPLAY,
+then calls xauth as the target user to merge the key into the a temporary
+database and later remove the database.
+
+pam_xauth cannot be told to not remove the keys when the session is closed.
+
+AUTHOR
+
+pam_xauth was written by Nalin Dahyabhai <nalin@redhat.com>, based on original
+version by Michael K. Johnson <johnsonm@redhat.com>.
+
diff --git a/modules/pam_xauth/README.xml b/modules/pam_xauth/README.xml
new file mode 100644
index 0000000..adefbd9
--- /dev/null
+++ b/modules/pam_xauth/README.xml
@@ -0,0 +1,46 @@
+<?xml version="1.0" encoding='UTF-8'?>
+<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
+"http://www.docbook.org/xml/4.3/docbookx.dtd"
+[
+<!--
+<!ENTITY pamaccess SYSTEM "pam_xauth.8.xml">
+-->
+]>
+
+<article>
+
+  <articleinfo>
+
+    <title>
+      <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+      href="pam_xauth.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_xauth-name"]/*)'/>
+    </title>
+
+  </articleinfo>
+
+  <section>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+      href="pam_xauth.8.xml" xpointer='xpointer(//refsect1[@id = "pam_xauth-description"]/*)'/>
+  </section>
+
+  <section>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+      href="pam_xauth.8.xml" xpointer='xpointer(//refsect1[@id = "pam_xauth-options"]/*)'/>
+  </section>
+
+  <section>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+      href="pam_xauth.8.xml" xpointer='xpointer(//refsect1[@id = "pam_xauth-examples"]/*)'/>
+  </section>
+
+  <section>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+      href="pam_xauth.8.xml" xpointer='xpointer(//refsect1[@id = "pam_xauth-implementation"]/*)'/>
+  </section>
+
+  <section>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+      href="pam_xauth.8.xml" xpointer='xpointer(//refsect1[@id = "pam_xauth-author"]/*)'/>
+  </section>
+
+</article>
diff --git a/modules/pam_xauth/pam_xauth.8 b/modules/pam_xauth/pam_xauth.8
new file mode 100644
index 0000000..86f8cc1
--- /dev/null
+++ b/modules/pam_xauth/pam_xauth.8
@@ -0,0 +1,183 @@
+'\" t
+.\"     Title: pam_xauth
+.\"    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_XAUTH" "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_xauth \- PAM module to forward xauth keys between users
+.SH "SYNOPSIS"
+.HP \w'\fBpam_xauth\&.so\fR\ 'u
+\fBpam_xauth\&.so\fR [debug] [xauthpath=\fI/path/to/xauth\fR] [systemuser=\fIUID\fR] [targetuser=\fIUID\fR]
+.SH "DESCRIPTION"
+.PP
+The pam_xauth PAM module is designed to forward xauth keys (sometimes referred to as "cookies") between users\&.
+.PP
+Without pam_xauth, when xauth is enabled and a user uses the
+\fBsu\fR(1)
+command to assume another user\*(Aqs privileges, that user is no longer able to access the original user\*(Aqs X display because the new user does not have the key needed to access the display\&. pam_xauth solves the problem by forwarding the key from the user running su (the source user) to the user whose identity the source user is assuming (the target user) when the session is created, and destroying the key when the session is torn down\&.
+.PP
+This means, for example, that when you run
+\fBsu\fR(1)
+from an xterm session, you will be able to run X programs without explicitly dealing with the
+\fBxauth\fR(1)
+xauth command or ~/\&.Xauthority files\&.
+.PP
+pam_xauth will only forward keys if xauth can list a key connected to the $DISPLAY environment variable\&.
+.PP
+Primitive access control is provided by
+~/\&.xauth/export
+in the invoking user\*(Aqs home directory and
+~/\&.xauth/import
+in the target user\*(Aqs home directory\&.
+.PP
+If a user has a
+~/\&.xauth/import
+file, the user will only receive cookies from users listed in the file\&. If there is no
+~/\&.xauth/import
+file, the user will accept cookies from any other user\&.
+.PP
+If a user has a
+\&.xauth/export
+file, the user will only forward cookies to users listed in the file\&. If there is no
+~/\&.xauth/export
+file, and the invoking user is not
+\fBroot\fR, the user will forward cookies to any other user\&. If there is no
+~/\&.xauth/export
+file, and the invoking user is
+\fBroot\fR, the user will
+\fInot\fR
+forward cookies to other users\&.
+.PP
+Both the import and export files support wildcards (such as
+\fI*\fR)\&. Both the import and export files can be empty, signifying that no users are allowed\&.
+.SH "OPTIONS"
+.PP
+\fBdebug\fR
+.RS 4
+Print debug information\&.
+.RE
+.PP
+\fBxauthpath=\fR\fB\fI/path/to/xauth\fR\fR
+.RS 4
+Specify the path the xauth program (it is expected in
+/usr/X11R6/bin/xauth,
+/usr/bin/xauth, or
+/usr/bin/X11/xauth
+by default)\&.
+.RE
+.PP
+\fBsystemuser=\fR\fB\fIUID\fR\fR
+.RS 4
+Specify the highest UID which will be assumed to belong to a "system" user\&. pam_xauth will refuse to forward credentials to users with UID less than or equal to this number, except for root and the "targetuser", if specified\&.
+.RE
+.PP
+\fBtargetuser=\fR\fB\fIUID\fR\fR
+.RS 4
+Specify a single target UID which is exempt from the systemuser check\&.
+.RE
+.SH "MODULE TYPES PROVIDED"
+.PP
+Only the
+\fBsession\fR
+type is provided\&.
+.SH "RETURN VALUES"
+.PP
+PAM_BUF_ERR
+.RS 4
+Memory buffer error\&.
+.RE
+.PP
+PAM_PERM_DENIED
+.RS 4
+Permission denied by import/export file\&.
+.RE
+.PP
+PAM_SESSION_ERR
+.RS 4
+Cannot determine user name, UID or access users home directory\&.
+.RE
+.PP
+PAM_SUCCESS
+.RS 4
+Success\&.
+.RE
+.PP
+PAM_USER_UNKNOWN
+.RS 4
+User not known\&.
+.RE
+.SH "EXAMPLES"
+.PP
+Add the following line to
+/etc/pam\&.d/su
+to forward xauth keys between users when calling su:
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+session  optional  pam_xauth\&.so
+      
+.fi
+.if n \{\
+.RE
+.\}
+.sp
+.SH "IMPLEMENTATION DETAILS"
+.PP
+pam_xauth will work
+\fIonly\fR
+if it is used from a setuid application in which the
+\fBgetuid\fR() call returns the id of the user running the application, and for which PAM can supply the name of the account that the user is attempting to assume\&. The typical application of this type is
+\fBsu\fR(1)\&. The application must call both
+\fBpam_open_session\fR() and
+\fBpam_close_session\fR() with the ruid set to the uid of the calling user and the euid set to root, and must have provided as the PAM_USER item the name of the target user\&.
+.PP
+pam_xauth calls
+\fBxauth\fR(1)
+as the source user to extract the key for $DISPLAY, then calls xauth as the target user to merge the key into the a temporary database and later remove the database\&.
+.PP
+pam_xauth cannot be told to not remove the keys when the session is closed\&.
+.SH "FILES"
+.PP
+~/\&.xauth/import
+.RS 4
+XXX
+.RE
+.PP
+~/\&.xauth/export
+.RS 4
+XXX
+.RE
+.SH "SEE ALSO"
+.PP
+\fBpam.conf\fR(5),
+\fBpam.d\fR(5),
+\fBpam\fR(8)
+.SH "AUTHOR"
+.PP
+pam_xauth was written by Nalin Dahyabhai <nalin@redhat\&.com>, based on original version by Michael K\&. Johnson <johnsonm@redhat\&.com>\&.
diff --git a/modules/pam_xauth/pam_xauth.8.xml b/modules/pam_xauth/pam_xauth.8.xml
new file mode 100644
index 0000000..08c06cf
--- /dev/null
+++ b/modules/pam_xauth/pam_xauth.8.xml
@@ -0,0 +1,293 @@
+<?xml version="1.0" encoding='UTF-8'?>
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
+	"http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd">
+
+<refentry id="pam_xauth">
+
+  <refmeta>
+    <refentrytitle>pam_xauth</refentrytitle>
+    <manvolnum>8</manvolnum>
+    <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo>
+  </refmeta>
+
+  <refnamediv id="pam_xauth-name">
+    <refname>pam_xauth</refname>
+    <refpurpose>PAM module to forward xauth keys between users</refpurpose>
+  </refnamediv>
+
+  <refsynopsisdiv>
+    <cmdsynopsis id="pam_xauth-cmdsynopsis">
+      <command>pam_xauth.so</command>
+      <arg choice="opt">
+	debug
+      </arg>
+      <arg choice="opt">
+        xauthpath=<replaceable>/path/to/xauth</replaceable>
+      </arg>
+      <arg choice="opt">
+        systemuser=<replaceable>UID</replaceable>
+      </arg>
+      <arg choice="opt">
+        targetuser=<replaceable>UID</replaceable>
+      </arg>
+    </cmdsynopsis>
+  </refsynopsisdiv>
+
+  <refsect1 id="pam_xauth-description">
+    <title>DESCRIPTION</title>
+    <para>
+      The pam_xauth PAM module is designed to forward xauth keys
+      (sometimes referred to as "cookies") between users.
+    </para>
+    <para>
+      Without pam_xauth, when xauth is enabled and a user uses the
+       <citerefentry>
+        <refentrytitle>su</refentrytitle><manvolnum>1</manvolnum>
+      </citerefentry> command to assume another user's privileges,
+      that user is no longer able to access the original user's X display
+      because the new user does not have the key needed to access the
+      display. pam_xauth solves the problem by forwarding the key from
+      the user running su (the source user) to the user whose identity the
+      source user is assuming (the target user) when the session is created,
+      and destroying the key when the session is torn down.
+    </para>
+    <para>
+      This means, for example, that when you run
+       <citerefentry>
+        <refentrytitle>su</refentrytitle><manvolnum>1</manvolnum>
+      </citerefentry> from an xterm session, you will be able to run
+      X programs without explicitly dealing with the
+      <citerefentry>
+        <refentrytitle>xauth</refentrytitle><manvolnum>1</manvolnum>
+      </citerefentry> xauth command or ~/.Xauthority files.
+    </para>
+    <para>
+      pam_xauth will only forward keys if xauth can list a key connected
+      to the $DISPLAY environment variable.
+    </para>
+    <para>
+      Primitive access control is provided by
+      <filename>~/.xauth/export</filename> in the invoking user's home
+      directory and <filename>~/.xauth/import</filename> in the target
+      user's home directory.
+    </para>
+    <para>
+      If a user has a <filename>~/.xauth/import</filename> file, the user
+      will only receive cookies from users listed in the file. If there is
+      no <filename>~/.xauth/import</filename> file, the user will accept
+      cookies from any other user.
+    </para>
+    <para>
+      If a user has a <filename>.xauth/export</filename> file, the user will
+      only forward cookies to users listed in the file. If there is no
+      <filename>~/.xauth/export</filename> file, and the invoking user is
+      not <emphasis remap='B'>root</emphasis>, the user will forward cookies
+      to any other user. If there is no <filename>~/.xauth/export</filename>
+      file, and the invoking user is <emphasis remap='B'>root</emphasis>,
+      the user will <emphasis remap='I'>not</emphasis> forward cookies to
+      other users.
+    </para>
+    <para>
+      Both the import and export files support wildcards (such as
+      <emphasis remap='I'>*</emphasis>). Both the import and export files
+      can be empty, signifying that no users are allowed.
+    </para>
+  </refsect1>
+
+  <refsect1 id="pam_xauth-options">
+    <title>OPTIONS</title>
+    <variablelist>
+      <varlistentry>
+        <term>
+          <option>debug</option>
+        </term>
+        <listitem>
+          <para>
+	    Print debug information.
+          </para>
+        </listitem>
+      </varlistentry>
+      <varlistentry>
+        <term>
+          <option>xauthpath=<replaceable>/path/to/xauth</replaceable></option>
+        </term>
+        <listitem>
+          <para>
+            Specify the path the xauth program (it is expected in
+            <filename>/usr/X11R6/bin/xauth</filename>,
+            <filename>/usr/bin/xauth</filename>, or
+            <filename>/usr/bin/X11/xauth</filename> by default).
+          </para>
+        </listitem>
+      </varlistentry>
+      <varlistentry>
+        <term>
+          <option>systemuser=<replaceable>UID</replaceable></option>
+        </term>
+        <listitem>
+          <para>
+            Specify the highest UID which will be assumed to belong to a
+            "system" user. pam_xauth will refuse to forward credentials to
+            users with UID less than or equal to this number, except for
+            root and the "targetuser", if specified.
+          </para>
+        </listitem>
+      </varlistentry>
+      <varlistentry>
+        <term>
+          <option>targetuser=<replaceable>UID</replaceable></option>
+        </term>
+        <listitem>
+          <para>
+            Specify  a single target UID which is exempt from the
+            systemuser check.
+          </para>
+        </listitem>
+      </varlistentry>
+    </variablelist>
+  </refsect1>
+
+  <refsect1 id="pam_xauth-types">
+    <title>MODULE TYPES PROVIDED</title>
+    <para>
+      Only the <emphasis remap='B'>session</emphasis> type is provided.
+    </para>
+  </refsect1>
+
+  <refsect1 id='pam_xauth-return_values'>
+    <title>RETURN VALUES</title>
+    <variablelist>
+      <varlistentry>
+        <term>PAM_BUF_ERR</term>
+        <listitem>
+           <para>
+             Memory buffer error.
+          </para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term>PAM_PERM_DENIED</term>
+        <listitem>
+          <para>
+            Permission denied by import/export file.
+          </para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term>PAM_SESSION_ERR</term>
+        <listitem>
+          <para>
+	    Cannot determine user name, UID or access users home directory.
+          </para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term>PAM_SUCCESS</term>
+        <listitem>
+          <para>
+            Success.
+          </para>
+        </listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term>PAM_USER_UNKNOWN</term>
+        <listitem>
+          <para>
+            User not known.
+          </para>
+        </listitem>
+      </varlistentry>
+
+    </variablelist>
+  </refsect1>
+
+  <refsect1 id='pam_xauth-examples'>
+    <title>EXAMPLES</title>
+    <para>
+      Add the following line to <filename>/etc/pam.d/su</filename> to
+      forward xauth keys between users when calling su:
+      <programlisting>
+session  optional  pam_xauth.so
+      </programlisting>
+    </para>
+  </refsect1>
+
+  <refsect1 id="pam_xauth-implementation">
+    <title>IMPLEMENTATION DETAILS</title>
+    <para>
+      pam_xauth will work <emphasis remap='I'>only</emphasis> if it is
+      used from a setuid application in which the
+      <function>getuid</function>() call returns the id of the user
+      running the application, and for which PAM can supply the name
+      of the account that the user is attempting to assume. The typical
+      application of this type is
+      <citerefentry>
+       <refentrytitle>su</refentrytitle><manvolnum>1</manvolnum>
+      </citerefentry>.
+      The application must call both <function>pam_open_session</function>()
+      and <function>pam_close_session</function>() with the ruid set to the
+      uid of the calling user and the euid set to root, and must have
+      provided as the PAM_USER item the name of the target user.
+    </para>
+    <para>
+      pam_xauth calls
+      <citerefentry>
+       <refentrytitle>xauth</refentrytitle><manvolnum>1</manvolnum>
+      </citerefentry> as the source user to extract the key for $DISPLAY,
+      then calls xauth as the target user to merge the key into the a
+      temporary database and later remove the database.
+    </para>
+    <para>
+      pam_xauth cannot be told to not remove the keys when the session
+      is closed.
+    </para>
+  </refsect1>
+
+  <refsect1 id="pam_lastlog-files">
+    <title>FILES</title>
+    <variablelist>
+      <varlistentry>
+        <term><filename>~/.xauth/import</filename></term>
+        <listitem>
+          <para>XXX</para>
+        </listitem>
+      </varlistentry>
+      <varlistentry>
+        <term><filename>~/.xauth/export</filename></term>
+        <listitem>
+          <para>XXX</para>
+        </listitem>
+      </varlistentry>
+    </variablelist>
+  </refsect1>
+
+
+  <refsect1 id='pam_xauth-see_also'>
+    <title>SEE ALSO</title>
+    <para>
+      <citerefentry>
+	<refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum>
+      </citerefentry>,
+      <citerefentry>
+	<refentrytitle>pam.d</refentrytitle><manvolnum>5</manvolnum>
+      </citerefentry>,
+      <citerefentry>
+	<refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum>
+      </citerefentry>
+    </para>
+  </refsect1>
+
+  <refsect1 id='pam_xauth-author'>
+    <title>AUTHOR</title>
+      <para>
+        pam_xauth was written by Nalin Dahyabhai &lt;nalin@redhat.com&gt;,
+        based on original version by
+        Michael K. Johnson &lt;johnsonm@redhat.com&gt;.
+      </para>
+  </refsect1>
+
+</refentry>
diff --git a/modules/pam_xauth/pam_xauth.c b/modules/pam_xauth/pam_xauth.c
new file mode 100644
index 0000000..3339def
--- /dev/null
+++ b/modules/pam_xauth/pam_xauth.c
@@ -0,0 +1,800 @@
+/*
+ * Copyright 2001-2003 Red Hat, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, and the entire permission notice in its entirety,
+ *    including the disclaimer of warranties.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior
+ *    written permission.
+ *
+ * ALTERNATIVELY, this product may be distributed under the terms of
+ * the GNU Public License, in which case the provisions of the GPL are
+ * required INSTEAD OF the above restrictions.  (This clause is
+ * necessary due to a potential bad interaction between the GPL and
+ * the restrictions contained in a BSD-style copyright.)
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fnmatch.h>
+#include <grp.h>
+#include <limits.h>
+#include <netdb.h>
+#include <pwd.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+#include <unistd.h>
+
+#define PAM_SM_SESSION
+
+#include <security/pam_modules.h>
+#include <security/_pam_macros.h>
+#include <security/pam_modutil.h>
+#include <security/pam_ext.h>
+
+#ifdef WITH_SELINUX
+#include <selinux/selinux.h>
+#include <selinux/label.h>
+#include <sys/stat.h>
+#endif
+
+#define DATANAME "pam_xauth_cookie_file"
+#define XAUTHENV "XAUTHORITY"
+#define HOMEENV  "HOME"
+#define XAUTHDEF ".Xauthority"
+#define XAUTHTMP ".xauthXXXXXX"
+
+/* Hurd compatibility */
+#ifndef PATH_MAX
+#define PATH_MAX 4096
+#endif
+
+/* Possible paths to xauth executable */
+static const char * const xauthpaths[] = {
+#ifdef PAM_PATH_XAUTH
+	PAM_PATH_XAUTH,
+#endif
+	"/usr/X11R6/bin/xauth",
+	"/usr/bin/xauth",
+	"/usr/bin/X11/xauth"
+};
+
+/* Run a given command (with a NULL-terminated argument list), feeding it the
+ * given input on stdin, and storing any output it generates. */
+static int
+run_coprocess(pam_handle_t *pamh, const char *input, char **output,
+	      uid_t uid, gid_t gid, const char *command, ...)
+{
+	int ipipe[2], opipe[2], i;
+	char buf[LINE_MAX];
+	pid_t child;
+	char *buffer = NULL;
+	size_t buffer_size = 0;
+	va_list ap;
+
+	*output = NULL;
+
+	/* Create stdio pipery. */
+	if (pipe(ipipe) == -1) {
+		pam_syslog(pamh, LOG_ERR, "Could not create pipe: %m");
+		return -1;
+	}
+	if (pipe(opipe) == -1) {
+		pam_syslog(pamh, LOG_ERR, "Could not create pipe: %m");
+		close(ipipe[0]);
+		close(ipipe[1]);
+		return -1;
+	}
+
+	/* Fork off a child. */
+	child = fork();
+	if (child == -1) {
+		pam_syslog(pamh, LOG_ERR, "Could not fork: %m");
+		close(ipipe[0]);
+		close(ipipe[1]);
+		close(opipe[0]);
+		close(opipe[1]);
+		return -1;
+	}
+
+	if (child == 0) {
+		/* We're the child. */
+		size_t j;
+		const char *args[10];
+		/* Drop privileges. */
+		if (setgid(gid) == -1)
+		  {
+		    int err = errno;
+		    pam_syslog (pamh, LOG_ERR, "setgid(%lu) failed: %m",
+				(unsigned long) getegid ());
+		    _exit (err);
+		  }
+		if (setgroups(0, NULL) == -1)
+		  {
+		    int err = errno;
+		    pam_syslog (pamh, LOG_ERR, "setgroups() failed: %m");
+		    _exit (err);
+		  }
+		if (setuid(uid) == -1)
+		  {
+		    int err = errno;
+		    pam_syslog (pamh, LOG_ERR, "setuid(%lu) failed: %m",
+				(unsigned long) geteuid ());
+		    _exit (err);
+		  }
+		/* Set the pipe descriptors up as stdin and stdout, and close
+		 * everything else, including the original values for the
+		 * descriptors. */
+		if (dup2(ipipe[0], STDIN_FILENO) != STDIN_FILENO) {
+		    int err = errno;
+		    pam_syslog(pamh, LOG_ERR, "dup2 of %s failed: %m", "stdin");
+		    _exit(err);
+		}
+		if (dup2(opipe[1], STDOUT_FILENO) != STDOUT_FILENO) {
+		    int err = errno;
+		    pam_syslog(pamh, LOG_ERR, "dup2 of %s failed: %m", "stdout");
+		    _exit(err);
+		}
+		if (pam_modutil_sanitize_helper_fds(pamh, PAM_MODUTIL_IGNORE_FD,
+						    PAM_MODUTIL_IGNORE_FD,
+						    PAM_MODUTIL_NULL_FD) < 0) {
+		    _exit(1);
+		}
+		/* Initialize the argument list. */
+		memset(args, 0, sizeof(args));
+		/* Convert the varargs list into a regular array of strings. */
+		va_start(ap, command);
+		args[0] = command;
+		for (j = 1; j < ((sizeof(args) / sizeof(args[0])) - 1); j++) {
+			args[j] = va_arg(ap, const char*);
+			if (args[j] == NULL) {
+				break;
+			}
+		}
+		/* Run the command. */
+		execv(command, (char *const *) args);
+		/* Never reached. */
+		_exit(1);
+	}
+
+	/* We're the parent, so close the other ends of the pipes. */
+	close(opipe[1]);
+	/* Send input to the process (if we have any), then send an EOF. */
+	if (input) {
+		(void)pam_modutil_write(ipipe[1], input, strlen(input));
+	}
+	close(ipipe[0]); /* close here to avoid possible SIGPIPE above */
+	close(ipipe[1]);
+
+	/* Read data output until we run out of stuff to read. */
+	i = pam_modutil_read(opipe[0], buf, sizeof(buf));
+	while ((i != 0) && (i != -1)) {
+		char *tmp;
+		/* Resize the buffer to hold the data. */
+		tmp = realloc(buffer, buffer_size + i + 1);
+		if (tmp == NULL) {
+			/* Uh-oh, bail. */
+			if (buffer != NULL) {
+				free(buffer);
+			}
+			close(opipe[0]);
+			waitpid(child, NULL, 0);
+			return -1;
+		}
+		/* Save the new buffer location, copy the newly-read data into
+		 * the buffer, and make sure the result will be
+		 * nul-terminated. */
+		buffer = tmp;
+		memcpy(buffer + buffer_size, buf, i);
+		buffer[buffer_size + i] = '\0';
+		buffer_size += i;
+		/* Try to read again. */
+		i = pam_modutil_read(opipe[0], buf, sizeof(buf));
+	}
+	/* No more data.  Clean up and return data. */
+	close(opipe[0]);
+	*output = buffer;
+	waitpid(child, NULL, 0);
+	return 0;
+}
+
+/* Free a data item. */
+static void
+cleanup (pam_handle_t *pamh UNUSED, void *data, int err UNUSED)
+{
+	free (data);
+}
+
+/* Check if we want to allow export to the other user, or import from the
+ * other user. */
+static int
+check_acl(pam_handle_t *pamh,
+	  const char *sense, const char *this_user, const char *other_user,
+	  int noent_code, int debug)
+{
+	char path[PATH_MAX];
+	struct passwd *pwd;
+	FILE *fp = NULL;
+	int i, fd = -1, save_errno;
+	struct stat st;
+	PAM_MODUTIL_DEF_PRIVS(privs);
+
+	/* Check this user's <sense> file. */
+	pwd = pam_modutil_getpwnam(pamh, this_user);
+	if (pwd == NULL) {
+		pam_syslog(pamh, LOG_ERR,
+			   "error determining home directory for '%s'",
+			   this_user);
+		return PAM_SESSION_ERR;
+	}
+	/* Figure out what that file is really named. */
+	i = snprintf(path, sizeof(path), "%s/.xauth/%s", pwd->pw_dir, sense);
+	if ((i >= (int)sizeof(path)) || (i < 0)) {
+		pam_syslog(pamh, LOG_ERR,
+			   "name of user's home directory is too long");
+		return PAM_SESSION_ERR;
+	}
+	if (pam_modutil_drop_priv(pamh, &privs, pwd))
+		return PAM_SESSION_ERR;
+	if (!stat(path, &st)) {
+		if (!S_ISREG(st.st_mode))
+			errno = EINVAL;
+		else
+			fd = open(path, O_RDONLY | O_NOCTTY);
+	}
+	save_errno = errno;
+	if (pam_modutil_regain_priv(pamh, &privs)) {
+		if (fd >= 0)
+			close(fd);
+		return PAM_SESSION_ERR;
+	}
+	if (fd >= 0) {
+		if (!fstat(fd, &st)) {
+			if (!S_ISREG(st.st_mode))
+				errno = EINVAL;
+			else
+				fp = fdopen(fd, "r");
+		}
+		if (!fp) {
+			save_errno = errno;
+			close(fd);
+		}
+	}
+	if (fp) {
+		char buf[LINE_MAX], *tmp;
+		/* Scan the file for a list of specs of users to "trust". */
+		while (fgets(buf, sizeof(buf), fp) != NULL) {
+			tmp = memchr(buf, '\r', sizeof(buf));
+			if (tmp != NULL) {
+				*tmp = '\0';
+			}
+			tmp = memchr(buf, '\n', sizeof(buf));
+			if (tmp != NULL) {
+				*tmp = '\0';
+			}
+			if (fnmatch(buf, other_user, 0) == 0) {
+				if (debug) {
+					pam_syslog(pamh, LOG_DEBUG,
+						   "%s %s allowed by %s",
+						   other_user, sense, path);
+				}
+				fclose(fp);
+				return PAM_SUCCESS;
+			}
+		}
+		/* If there's no match in the file, we fail. */
+		if (debug) {
+			pam_syslog(pamh, LOG_DEBUG, "%s not listed in %s",
+				   other_user, path);
+		}
+		fclose(fp);
+		return PAM_PERM_DENIED;
+	} else {
+		/* Default to okay if the file doesn't exist. */
+	        errno = save_errno;
+		switch (errno) {
+		case ENOENT:
+			if (noent_code == PAM_SUCCESS) {
+				if (debug) {
+					pam_syslog(pamh, LOG_DEBUG,
+						   "%s does not exist, ignoring",
+						   path);
+				}
+			} else {
+				if (debug) {
+					pam_syslog(pamh, LOG_DEBUG,
+						   "%s does not exist, failing",
+						   path);
+				}
+			}
+			return noent_code;
+		default:
+			if (debug) {
+				pam_syslog(pamh, LOG_DEBUG,
+					   "error opening %s: %m", path);
+			}
+			return PAM_PERM_DENIED;
+		}
+	}
+}
+
+int
+pam_sm_open_session (pam_handle_t *pamh, int flags UNUSED,
+		     int argc, const char **argv)
+{
+	char *cookiefile = NULL, *xauthority = NULL,
+	     *cookie = NULL, *display = NULL, *tmp = NULL,
+	     *xauthlocalhostname = NULL;
+	const char *user, *xauth = NULL;
+	struct passwd *tpwd, *rpwd;
+	int fd, i, debug = 0;
+	int retval = PAM_SUCCESS;
+	uid_t systemuser = 499, targetuser = 0;
+
+	/* Parse arguments.  We don't understand many, so no sense in breaking
+	 * this into a separate function. */
+	for (i = 0; i < argc; i++) {
+		if (strcmp(argv[i], "debug") == 0) {
+			debug = 1;
+			continue;
+		}
+		if (strncmp(argv[i], "xauthpath=", 10) == 0) {
+			xauth = argv[i] + 10;
+			continue;
+		}
+		if (strncmp(argv[i], "targetuser=", 11) == 0) {
+			long l = strtol(argv[i] + 11, &tmp, 10);
+			if ((strlen(argv[i] + 11) > 0) && (*tmp == '\0')) {
+				targetuser = l;
+			} else {
+				pam_syslog(pamh, LOG_WARNING,
+					   "invalid value for targetuser (`%s')",
+					   argv[i] + 11);
+			}
+			continue;
+		}
+		if (strncmp(argv[i], "systemuser=", 11) == 0) {
+			long l = strtol(argv[i] + 11, &tmp, 10);
+			if ((strlen(argv[i] + 11) > 0) && (*tmp == '\0')) {
+				systemuser = l;
+			} else {
+				pam_syslog(pamh, LOG_WARNING,
+					   "invalid value for systemuser (`%s')",
+					   argv[i] + 11);
+			}
+			continue;
+		}
+		pam_syslog(pamh, LOG_WARNING, "unrecognized option `%s'",
+			   argv[i]);
+	}
+
+	if (xauth == NULL) {
+	        size_t j;
+		for (j = 0; j < sizeof(xauthpaths)/sizeof(xauthpaths[0]); j++) {
+			if (access(xauthpaths[j], X_OK) == 0) {
+				xauth = xauthpaths[j];
+				break;
+			}
+		}
+		if (xauth == NULL) {
+			/* xauth executable not found - nothing to do */
+			return PAM_SUCCESS;
+		}
+	}
+
+	/* If DISPLAY isn't set, we don't really care, now do we? */
+	if ((display = getenv("DISPLAY")) == NULL) {
+		if (debug) {
+			pam_syslog(pamh, LOG_DEBUG,
+				   "user has no DISPLAY, doing nothing");
+		}
+		return PAM_SUCCESS;
+	}
+
+	/* Read the target user's name. */
+	if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS) {
+		pam_syslog(pamh, LOG_ERR,
+			   "error determining target user's name");
+		retval = PAM_SESSION_ERR;
+		goto cleanup;
+	}
+	rpwd = pam_modutil_getpwuid(pamh, getuid());
+	if (rpwd == NULL) {
+		pam_syslog(pamh, LOG_ERR,
+			   "error determining invoking user's name");
+		retval = PAM_SESSION_ERR;
+		goto cleanup;
+	}
+
+	/* Get the target user's UID and primary GID, which we'll need to set
+	 * on the xauthority file we create later on. */
+	tpwd = pam_modutil_getpwnam(pamh, user);
+	if (tpwd == NULL) {
+		pam_syslog(pamh, LOG_ERR,
+			   "error determining target user's UID");
+		retval = PAM_SESSION_ERR;
+		goto cleanup;
+	}
+
+	if (debug) {
+		pam_syslog(pamh, LOG_DEBUG,
+			   "requesting user %lu/%lu, target user %lu/%lu",
+			   (unsigned long) rpwd->pw_uid,
+			   (unsigned long) rpwd->pw_gid,
+			   (unsigned long) tpwd->pw_uid,
+			   (unsigned long) tpwd->pw_gid);
+	}
+
+	/* If the UID is a system account (and not the superuser), forget
+	 * about forwarding keys. */
+	if ((tpwd->pw_uid != 0) &&
+	    (tpwd->pw_uid != targetuser) &&
+	    (tpwd->pw_uid <= systemuser)) {
+		if (debug) {
+			pam_syslog(pamh, LOG_DEBUG,
+				   "not forwarding cookies to user ID %lu",
+				   (unsigned long) tpwd->pw_uid);
+		}
+		retval = PAM_SESSION_ERR;
+		goto cleanup;
+	}
+
+
+	/* If current user and the target user are the same, don't
+	   check the ACL list, but forward X11 */
+	if (strcmp (rpwd->pw_name, tpwd->pw_name) != 0) {
+
+	  /* Check that both users are amenable to this.  By default, this
+	   * boils down to this policy:
+	   * export(ruser=root): only if <user> is listed in .xauth/export
+	   * export(ruser=*) if <user> is listed in .xauth/export, or
+	   *                 if .xauth/export does not exist
+	   * import(user=*): if <ruser> is listed in .xauth/import, or
+	   *                 if .xauth/import does not exist */
+	  i = (getuid() != 0 || tpwd->pw_uid == 0) ? PAM_SUCCESS : PAM_PERM_DENIED;
+	  i = check_acl(pamh, "export", rpwd->pw_name, user, i, debug);
+	  if (i != PAM_SUCCESS) {
+	    retval = PAM_SESSION_ERR;
+	    goto cleanup;
+	  }
+	  i = PAM_SUCCESS;
+	  i = check_acl(pamh, "import", user, rpwd->pw_name, i, debug);
+	  if (i != PAM_SUCCESS) {
+	    retval = PAM_SESSION_ERR;
+	    goto cleanup;
+	  }
+	}  else {
+	  if (debug)
+	    pam_syslog (pamh, LOG_DEBUG, "current and target user are the same, forward X11");
+	}
+
+	/* Figure out where the source user's .Xauthority file is. */
+	if (getenv(XAUTHENV) != NULL) {
+		cookiefile = strdup(getenv(XAUTHENV));
+	} else {
+		cookiefile = malloc(strlen(rpwd->pw_dir) + 1 +
+				    strlen(XAUTHDEF) + 1);
+		if (cookiefile == NULL) {
+			retval = PAM_SESSION_ERR;
+			goto cleanup;
+		}
+		strcpy(cookiefile, rpwd->pw_dir);
+		strcat(cookiefile, "/");
+		strcat(cookiefile, XAUTHDEF);
+	}
+	if (debug) {
+		pam_syslog(pamh, LOG_DEBUG, "reading keys from `%s'",
+			   cookiefile);
+	}
+
+	/* Read the user's .Xauthority file.  Because the current UID is
+	 * the original user's UID, this will only fail if something has
+	 * gone wrong, or we have no cookies. */
+	if (debug) {
+		pam_syslog(pamh, LOG_DEBUG,
+			   "running \"%s %s %s %s %s\" as %lu/%lu",
+			   xauth, "-f", cookiefile, "nlist", display,
+			   (unsigned long) getuid(), (unsigned long) getgid());
+	}
+	if (run_coprocess(pamh, NULL, &cookie,
+			  getuid(), getgid(),
+			  xauth, "-f", cookiefile, "nlist", display,
+			  NULL) == 0) {
+#ifdef WITH_SELINUX
+		security_context_t context = NULL;
+#endif
+		PAM_MODUTIL_DEF_PRIVS(privs);
+
+		/* Check that we got a cookie.  If not, we get creative. */
+		if (((cookie == NULL) || (strlen(cookie) == 0)) &&
+		    ((strncmp(display, "localhost:", 10) == 0) ||
+		     (strncmp(display, "localhost/unix:", 15) == 0))) {
+			char *t, *screen;
+			size_t tlen, slen;
+			/* Free the useless cookie string. */
+			if (cookie != NULL) {
+				free(cookie);
+				cookie = NULL;
+			}
+			/* Allocate enough space to hold an adjusted name. */
+			tlen = strlen(display) + LINE_MAX + 1;
+			t = malloc(tlen);
+			if (t != NULL) {
+				memset(t, 0, tlen);
+				if (gethostname(t, tlen - 1) != -1) {
+					/* Append the protocol and then the
+					 * screen number. */
+					if (strlen(t) < tlen - 6) {
+						strcat(t, "/unix:");
+					}
+					screen = strchr(display, ':');
+					if (screen != NULL) {
+						screen++;
+						slen = strlen(screen);
+						if (strlen(t) + slen < tlen) {
+							strcat(t, screen);
+						}
+					}
+					if (debug) {
+						pam_syslog(pamh, LOG_DEBUG,
+							   "no key for `%s', "
+							   "trying `%s'",
+							   display, t);
+					}
+					/* Read the cookie for this display. */
+					if (debug) {
+						pam_syslog(pamh, LOG_DEBUG,
+						       "running "
+						       "\"%s %s %s %s %s\" as "
+						       "%lu/%lu",
+						       xauth,
+						       "-f",
+						       cookiefile,
+						       "nlist",
+						       t,
+						       (unsigned long) getuid(),
+						       (unsigned long) getgid());
+					}
+					run_coprocess(pamh, NULL, &cookie,
+						      getuid(), getgid(),
+						      xauth, "-f", cookiefile,
+						      "nlist", t, NULL);
+				}
+				free(t);
+				t = NULL;
+			}
+		}
+
+		/* Check that we got a cookie, this time for real. */
+		if ((cookie == NULL) || (strlen(cookie) == 0)) {
+			if (debug) {
+				pam_syslog(pamh, LOG_DEBUG, "no key");
+			}
+			retval = PAM_SESSION_ERR;
+			goto cleanup;
+		}
+
+		/* Generate the environment variable
+		 * "XAUTHORITY=<homedir>/filename". */
+		if (asprintf(&xauthority, "%s=%s/%s",
+			     XAUTHENV, tpwd->pw_dir, XAUTHTMP) < 0) {
+			xauthority = NULL;
+			if (debug) {
+				pam_syslog(pamh, LOG_DEBUG, "out of memory");
+			}
+			retval = PAM_SESSION_ERR;
+			goto cleanup;
+		}
+
+		/* Generate a new file to hold the data. */
+		if (pam_modutil_drop_priv(pamh, &privs, tpwd)) {
+			retval = PAM_SESSION_ERR;
+			goto cleanup;
+		}
+#ifdef WITH_SELINUX
+		if (is_selinux_enabled() > 0) {
+			struct selabel_handle *ctx = selabel_open(SELABEL_CTX_FILE, NULL, 0);
+			if (ctx != NULL) {
+				if (selabel_lookup(ctx, &context,
+						   xauthority + sizeof(XAUTHENV), S_IFREG) != 0) {
+					pam_syslog(pamh, LOG_WARNING,
+						   "could not get SELinux label for '%s'",
+						   xauthority + sizeof(XAUTHENV));
+				}
+				selabel_close(ctx);
+				if (setfscreatecon(context)) {
+					pam_syslog(pamh, LOG_WARNING,
+						   "setfscreatecon(%s) failed: %m", context);
+				}
+			}
+		}
+#endif /* WITH_SELINUX */
+		fd = mkstemp(xauthority + sizeof(XAUTHENV));
+		if (fd < 0)
+			pam_syslog(pamh, LOG_ERR,
+				   "error creating temporary file `%s': %m",
+				   xauthority + sizeof(XAUTHENV));
+#ifdef WITH_SELINUX
+		if (context != NULL) {
+			free(context);
+			setfscreatecon(NULL);
+		}
+#endif /* WITH_SELINUX */
+		if (fd >= 0)
+			close(fd);
+		if (pam_modutil_regain_priv(pamh, &privs) || fd < 0) {
+			retval = PAM_SESSION_ERR;
+			goto cleanup;
+		}
+
+		/* Get a copy of the filename to save as a data item for
+		 * removal at session-close time. */
+		free(cookiefile);
+		cookiefile = strdup(xauthority + sizeof(XAUTHENV));
+
+		/* Save the filename. */
+		if (pam_set_data(pamh, DATANAME, cookiefile, cleanup) != PAM_SUCCESS) {
+			pam_syslog(pamh, LOG_ERR,
+				   "error saving name of temporary file `%s'",
+				   cookiefile);
+			unlink(cookiefile);
+			retval = PAM_SESSION_ERR;
+			goto cleanup;
+		}
+
+		/* Set the new variable in the environment. */
+		if (pam_putenv (pamh, xauthority) != PAM_SUCCESS)
+			pam_syslog(pamh, LOG_ERR,
+				   "can't set environment variable '%s'",
+				   xauthority);
+		putenv (xauthority); /* The environment owns this string now. */
+		xauthority = NULL; /* Don't free environment variables. */
+
+		/* set $DISPLAY in pam handle to make su - work */
+		{
+		  char *d;
+
+		  if (asprintf(&d, "DISPLAY=%s", display) < 0)
+		    {
+		      pam_syslog(pamh, LOG_CRIT, "out of memory");
+		      cookiefile = NULL;
+		      retval = PAM_SESSION_ERR;
+		      goto cleanup;
+		    }
+
+		  if (pam_putenv (pamh, d) != PAM_SUCCESS)
+		    pam_syslog (pamh, LOG_ERR,
+				"can't set environment variable '%s'", d);
+		  free (d);
+		}
+
+		/* set XAUTHLOCALHOSTNAME to make sure that su - work under gnome */
+		if ((xauthlocalhostname = getenv("XAUTHLOCALHOSTNAME")) != NULL) {
+		  char *d;
+
+		  if (asprintf(&d, "XAUTHLOCALHOSTNAME=%s", xauthlocalhostname) < 0) {
+		    pam_syslog(pamh, LOG_CRIT, "out of memory");
+		    retval = PAM_SESSION_ERR;
+		    goto cleanup;
+		  }
+
+		  if (pam_putenv (pamh, d) != PAM_SUCCESS)
+		    pam_syslog (pamh, LOG_ERR,
+				"can't set environment variable '%s'", d);
+		  free (d);
+		}
+
+		/* Merge the cookie we read before into the new file. */
+		if (debug) {
+			pam_syslog(pamh, LOG_DEBUG,
+				   "writing key `%s' to temporary file `%s'",
+				   cookie, cookiefile);
+		}
+		if (debug) {
+			pam_syslog(pamh, LOG_DEBUG,
+				  "running \"%s %s %s %s %s\" as %lu/%lu",
+				  xauth, "-f", cookiefile, "nmerge", "-",
+				  (unsigned long) tpwd->pw_uid,
+				  (unsigned long) tpwd->pw_gid);
+		}
+		run_coprocess(pamh, cookie, &tmp,
+			      tpwd->pw_uid, tpwd->pw_gid,
+			      xauth, "-f", cookiefile, "nmerge", "-", NULL);
+
+		/* We don't need to keep a copy of these around any more. */
+		cookiefile = NULL;
+		free(tmp);
+	}
+cleanup:
+	/* Unset any old XAUTHORITY variable in the environment. */
+	if (retval != PAM_SUCCESS && getenv (XAUTHENV))
+		unsetenv (XAUTHENV);
+	free(cookiefile);
+	free(cookie);
+	free(xauthority);
+	return retval;
+}
+
+int
+pam_sm_close_session (pam_handle_t *pamh, int flags UNUSED,
+		      int argc, const char **argv)
+{
+	int i, debug = 0;
+	const char *user;
+	const void *data;
+	const char *cookiefile;
+	struct passwd *tpwd;
+	PAM_MODUTIL_DEF_PRIVS(privs);
+
+	/* Try to retrieve the name of a file we created when
+	 * the session was opened. */
+	if (pam_get_data(pamh, DATANAME, &data) != PAM_SUCCESS)
+		return PAM_SUCCESS;
+	cookiefile = data;
+
+	/* Parse arguments.  We don't understand many, so
+	 * no sense in breaking this into a separate function. */
+	for (i = 0; i < argc; i++) {
+		if (strcmp(argv[i], "debug") == 0) {
+			debug = 1;
+			continue;
+		}
+		if (strncmp(argv[i], "xauthpath=", 10) == 0)
+			continue;
+		if (strncmp(argv[i], "systemuser=", 11) == 0)
+			continue;
+		if (strncmp(argv[i], "targetuser=", 11) == 0)
+			continue;
+		pam_syslog(pamh, LOG_WARNING, "unrecognized option `%s'",
+		       argv[i]);
+	}
+
+	if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS) {
+		pam_syslog(pamh, LOG_ERR,
+			   "error determining target user's name");
+		return PAM_SESSION_ERR;
+	}
+	if (!(tpwd = pam_modutil_getpwnam(pamh, user))) {
+		pam_syslog(pamh, LOG_ERR,
+			   "error determining target user's UID");
+		return PAM_SESSION_ERR;
+	}
+
+	if (debug)
+		pam_syslog(pamh, LOG_DEBUG, "removing `%s'", cookiefile);
+	if (pam_modutil_drop_priv(pamh, &privs, tpwd))
+		return PAM_SESSION_ERR;
+	if (unlink(cookiefile) == -1 && errno != ENOENT)
+	  pam_syslog(pamh, LOG_WARNING, "Couldn't remove `%s': %m", cookiefile);
+	if (pam_modutil_regain_priv(pamh, &privs))
+		return PAM_SESSION_ERR;
+
+	return PAM_SUCCESS;
+}
diff --git a/modules/pam_xauth/tst-pam_xauth b/modules/pam_xauth/tst-pam_xauth
new file mode 100755
index 0000000..3294896
--- /dev/null
+++ b/modules/pam_xauth/tst-pam_xauth
@@ -0,0 +1,2 @@
+#!/bin/sh
+../../tests/tst-dlopen .libs/pam_xauth.so