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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>6.41. pam_xauth - forward xauth keys between users</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="Linux-PAM_SAG.html" title="The Linux-PAM System Administrators' Guide"><link rel="up" href="sag-module-reference.html" title="Chapter 6. A reference guide for available modules"><link rel="prev" href="sag-pam_wheel.html" title="6.40. pam_wheel - only permit root access to members of group wheel"><link rel="next" href="sag-see-also.html" title="Chapter 7. See also"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">6.41. pam_xauth - forward xauth keys between users</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="sag-pam_wheel.html">Prev</a> </td><th width="60%" align="center">Chapter 6. A reference guide for available modules</th><td width="20%" align="right"> <a accesskey="n" href="sag-see-also.html">Next</a></td></tr></table><hr></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="sag-pam_xauth"></a>6.41. pam_xauth - forward xauth keys between users</h2></div></div></div><div class="cmdsynopsis"><p><code class="command">pam_xauth.so</code> [
debug
] [
xauthpath=<em class="replaceable"><code>/path/to/xauth</code></em>
] [
systemuser=<em class="replaceable"><code>UID</code></em>
] [
targetuser=<em class="replaceable"><code>UID</code></em>
]</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_xauth-description"></a>6.41.1. DESCRIPTION</h3></div></div></div><p>
The pam_xauth PAM module is designed to forward xauth keys
(sometimes referred to as "cookies") between users.
</p><p>
Without pam_xauth, when xauth is enabled and a user uses the
<span class="citerefentry"><span class="refentrytitle">su</span>(1)</span> 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.
</p><p>
This means, for example, that when you run
<span class="citerefentry"><span class="refentrytitle">su</span>(1)</span> from an xterm session, you will be able to run
X programs without explicitly dealing with the
<span class="citerefentry"><span class="refentrytitle">xauth</span>(1)</span> xauth command or ~/.Xauthority files.
</p><p>
pam_xauth will only forward keys if xauth can list a key connected
to the $DISPLAY environment variable.
</p><p>
Primitive access control is provided by
<code class="filename">~/.xauth/export</code> in the invoking user's home
directory and <code class="filename">~/.xauth/import</code> in the target
user's home directory.
</p><p>
If a user has a <code class="filename">~/.xauth/import</code> file, the user
will only receive cookies from users listed in the file. If there is
no <code class="filename">~/.xauth/import</code> file, the user will accept
cookies from any other user.
</p><p>
If a user has a <code class="filename">.xauth/export</code> file, the user will
only forward cookies to users listed in the file. If there is no
<code class="filename">~/.xauth/export</code> file, and the invoking user is
not <span class="emphasis"><em>root</em></span>, the user will forward cookies
to any other user. If there is no <code class="filename">~/.xauth/export</code>
file, and the invoking user is <span class="emphasis"><em>root</em></span>,
the user will <span class="emphasis"><em>not</em></span> forward cookies to
other users.
</p><p>
Both the import and export files support wildcards (such as
<span class="emphasis"><em>*</em></span>). Both the import and export files
can be empty, signifying that no users are allowed.
</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_xauth-options"></a>6.41.2. OPTIONS</h3></div></div></div><div class="variablelist"><dl class="variablelist"><dt><span class="term">
<code class="option">debug</code>
</span></dt><dd><p>
Print debug information.
</p></dd><dt><span class="term">
<code class="option">xauthpath=<em class="replaceable"><code>/path/to/xauth</code></em></code>
</span></dt><dd><p>
Specify the path the xauth program (it is expected in
<code class="filename">/usr/X11R6/bin/xauth</code>,
<code class="filename">/usr/bin/xauth</code>, or
<code class="filename">/usr/bin/X11/xauth</code> by default).
</p></dd><dt><span class="term">
<code class="option">systemuser=<em class="replaceable"><code>UID</code></em></code>
</span></dt><dd><p>
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.
</p></dd><dt><span class="term">
<code class="option">targetuser=<em class="replaceable"><code>UID</code></em></code>
</span></dt><dd><p>
Specify a single target UID which is exempt from the
systemuser check.
</p></dd></dl></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_xauth-types"></a>6.41.3. MODULE TYPES PROVIDED</h3></div></div></div><p>
Only the <span class="emphasis"><em>session</em></span> type is provided.
</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_xauth-return_values"></a>6.41.4. RETURN VALUES</h3></div></div></div><div class="variablelist"><dl class="variablelist"><dt><span class="term">PAM_BUF_ERR</span></dt><dd><p>
Memory buffer error.
</p></dd><dt><span class="term">PAM_PERM_DENIED</span></dt><dd><p>
Permission denied by import/export file.
</p></dd><dt><span class="term">PAM_SESSION_ERR</span></dt><dd><p>
Cannot determine user name, UID or access users home directory.
</p></dd><dt><span class="term">PAM_SUCCESS</span></dt><dd><p>
Success.
</p></dd><dt><span class="term">PAM_USER_UNKNOWN</span></dt><dd><p>
User not known.
</p></dd></dl></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_xauth-examples"></a>6.41.5. EXAMPLES</h3></div></div></div><p>
Add the following line to <code class="filename">/etc/pam.d/su</code> to
forward xauth keys between users when calling su:
</p><pre class="programlisting">
session optional pam_xauth.so
</pre><p>
</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_xauth-author"></a>6.41.6. AUTHOR</h3></div></div></div><p>
pam_xauth was written by Nalin Dahyabhai <nalin@redhat.com>,
based on original version by
Michael K. Johnson <johnsonm@redhat.com>.
</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="sag-pam_wheel.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="sag-module-reference.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="sag-see-also.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">6.40. pam_wheel - only permit root access to members of group wheel </td><td width="20%" align="center"><a accesskey="h" href="Linux-PAM_SAG.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 7. See also</td></tr></table></div></body></html>