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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>6.28. pam_securetty - limit root login to special devices</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_rootok.html" title="6.27. pam_rootok - gain only root access"><link rel="next" href="sag-pam_selinux.html" title="6.29. pam_selinux - set the default security context"></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">6.28. pam_securetty - limit root login to special devices</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="sag-pam_rootok.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_selinux.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_securetty"></a>6.28. pam_securetty - limit root login to special devices</h2></div></div></div><div class="cmdsynopsis"><p><code class="command">pam_securetty.so</code>  [
        debug
      ]</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_securetty-description"></a>6.28.1. DESCRIPTION</h3></div></div></div><p>
      pam_securetty is a PAM module that allows root logins only if the
      user is logging in on a "secure" tty, as defined by the listing
      in <code class="filename">/etc/securetty</code>. pam_securetty also checks
      to make sure that <code class="filename">/etc/securetty</code> is a plain
      file and not world writable. It will also allow root logins on
      the tty specified with <code class="option">console=</code> switch on the
      kernel command line and on ttys from the
      <code class="filename">/sys/class/tty/console/active</code>.
    </p><p>
      This module has no effect on non-root users and requires that the
      application fills in the <span class="emphasis"><em>PAM_TTY</em></span>
      item correctly.
    </p><p>
      For canonical usage, should be listed as a
      <span class="emphasis"><em>required</em></span> authentication method
      before any <span class="emphasis"><em>sufficient</em></span>
      authentication methods.
    </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_securetty-options"></a>6.28.2. 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">noconsole</code>
        </span></dt><dd><p>
            Do not automatically allow root logins on the kernel console
            device, as specified on the kernel command line or by the sys file,
            if it is not also specified in the
            <code class="filename">/etc/securetty</code> file.
          </p></dd></dl></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_securetty-types"></a>6.28.3. MODULE TYPES PROVIDED</h3></div></div></div><p>
      Only the <code class="option">auth</code> module type is provided.
    </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_securetty-return_values"></a>6.28.4. RETURN VALUES</h3></div></div></div><div class="variablelist"><dl class="variablelist"><dt><span class="term">PAM_SUCCESS</span></dt><dd><p>
            The user is allowed to continue authentication.
            Either the user is not root, or the root user is
            trying to log in on an acceptable device.
          </p></dd><dt><span class="term">PAM_AUTH_ERR</span></dt><dd><p>
            Authentication is rejected. Either root is attempting to
            log in via an unacceptable device, or the
            <code class="filename">/etc/securetty</code> file is world writable or
            not a normal file.
          </p></dd><dt><span class="term">PAM_INCOMPLETE</span></dt><dd><p>
            An application error occurred. pam_securetty was not able
            to get information it required from the application that
            called it.
          </p></dd><dt><span class="term">PAM_SERVICE_ERR</span></dt><dd><p>
            An error occurred while the module was determining the
            user's name or tty, or the module could not open
            <code class="filename">/etc/securetty</code>.
          </p></dd><dt><span class="term">PAM_USER_UNKNOWN</span></dt><dd><p>
            The module could not find the user name in the
            <code class="filename">/etc/passwd</code> file to verify whether
            the user had a UID of 0. Therefore, the results of running
            this module are ignored.
          </p></dd></dl></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_securetty-examples"></a>6.28.5. EXAMPLES</h3></div></div></div><p>
      </p><pre class="programlisting">
auth  required  pam_securetty.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_securetty-author"></a>6.28.6. AUTHOR</h3></div></div></div><p>
        pam_securetty was written by Elliot Lee &lt;sopwith@cuc.edu&gt;.
      </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_rootok.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_selinux.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">6.27. pam_rootok - gain only root access </td><td width="20%" align="center"><a accesskey="h" href="Linux-PAM_SAG.html">Home</a></td><td width="40%" align="right" valign="top"> 6.29. pam_selinux - set the default security context</td></tr></table></div></body></html>
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