<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>6.27.pam_rootok - gain only root access</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2"><link rel="home" href="Linux-PAM_SAG.html" title="The Linux-PAM System Administrators' Guide"><link rel="up" href="sag-module-reference.html" title="Chapter6.A reference guide for available modules"><link rel="prev" href="sag-pam_rhosts.html" title="6.26.pam_rhosts - grant access using .rhosts file"><link rel="next" href="sag-pam_securetty.html" title="6.28.pam_securetty - limit root login to special devices"></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">6.27.pam_rootok - gain only root access</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="sag-pam_rhosts.html">Prev</a></td><th width="60%" align="center">Chapter6.A reference guide for available modules</th><td width="20%" align="right"><a accesskey="n" href="sag-pam_securetty.html">Next</a></td></tr></table><hr></div><div class="section" title="6.27.pam_rootok - gain only root access"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="sag-pam_rootok"></a>6.27.pam_rootok - gain only root access</h2></div></div></div><div class="cmdsynopsis"><p><code class="command">pam_rootok.so</code> [
debug
]</p></div><div class="section" title="6.27.1.DESCRIPTION"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_rootok-description"></a>6.27.1.DESCRIPTION</h3></div></div></div><p>
pam_rootok is a PAM module that authenticates the user if their
<span class="emphasis"><em>UID</em></span> is <span class="emphasis"><em>0</em></span>.
Applications that are created setuid-root generally retain the
<span class="emphasis"><em>UID</em></span> of the user but run with the authority
of an enhanced effective-UID. It is the real <span class="emphasis"><em>UID</em></span>
that is checked.
</p></div><div class="section" title="6.27.2.OPTIONS"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_rootok-options"></a>6.27.2.OPTIONS</h3></div></div></div><div class="variablelist"><dl><dt><span class="term">
<code class="option">debug</code>
</span></dt><dd><p>
Print debug information.
</p></dd></dl></div></div><div class="section" title="6.27.3.MODULE TYPES PROVIDED"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_rootok-types"></a>6.27.3.MODULE TYPES PROVIDED</h3></div></div></div><p>
Only the <code class="option">auth</code> type is provided.
</p></div><div class="section" title="6.27.4.RETURN VALUES"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_rootok-return_values"></a>6.27.4.RETURN VALUES</h3></div></div></div><div class="variablelist"><dl><dt><span class="term">PAM_SUCCESS</span></dt><dd><p>
The <span class="emphasis"><em>UID</em></span> is <span class="emphasis"><em>0</em></span>.
</p></dd><dt><span class="term">PAM_AUTH_ERR</span></dt><dd><p>
The <span class="emphasis"><em>UID</em></span> is <span class="emphasis"><em>not</em></span>
<span class="emphasis"><em>0</em></span>.
</p></dd></dl></div></div><div class="section" title="6.27.5.EXAMPLES"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_rootok-examples"></a>6.27.5.EXAMPLES</h3></div></div></div><p>
In the case of the <span class="citerefentry"><span class="refentrytitle">su</span>(1)</span> application the historical usage is to
permit the superuser to adopt the identity of a lesser user
without the use of a password. To obtain this behavior with PAM
the following pair of lines are needed for the corresponding entry
in the <code class="filename">/etc/pam.d/su</code> configuration file:
</p><pre class="programlisting">
# su authentication. Root is granted access by default.
auth sufficient pam_rootok.so
auth required pam_unix.so
</pre><p>
</p></div><div class="section" title="6.27.6.AUTHOR"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_rootok-author"></a>6.27.6.AUTHOR</h3></div></div></div><p>
pam_rootok was written by Andrew G. Morgan, <morgan@kernel.org>.
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