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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>6.27. pam_rootok - gain only root access</title><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot"><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_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">Chapter 6. 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"><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"><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"><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 class="variablelist"><dt><span class="term">
          <code class="option">debug</code>
        </span></dt><dd><p>
            Print debug information.
          </p></dd></dl></div></div><div class="section"><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>
      The <code class="option">auth</code>, <code class="option">acct</code> and
      <code class="option">password</code> module types are provided.
    </p></div><div class="section"><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 class="variablelist"><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"><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"><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>.
      </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_rhosts.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-pam_securetty.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">6.26. pam_rhosts - grant access using .rhosts file </td><td width="20%" align="center"><a accesskey="h" href="Linux-PAM_SAG.html">Home</a></td><td width="40%" align="right" valign="top"> 6.28. pam_securetty - limit root login to special devices</td></tr></table></div></body></html>