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+<?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_securetty">
+
+ <refmeta>
+ <refentrytitle>pam_securetty</refentrytitle>
+ <manvolnum>8</manvolnum>
+ <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo>
+ </refmeta>
+
+ <refnamediv id="pam_securetty-name">
+ <refname>pam_securetty</refname>
+ <refpurpose>Limit root login to special devices</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <cmdsynopsis id="pam_securetty-cmdsynopsis">
+ <command>pam_securetty.so</command>
+ <arg choice="opt">
+ debug
+ </arg>
+ </cmdsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1 id="pam_securetty-description">
+
+ <title>DESCRIPTION</title>
+
+ <para>
+ 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 the <filename>securetty</filename> file. pam_securetty checks at
+ first, if <filename>/etc/securetty</filename> exists. If not and
+ it was built with vendordir support, it will use
+ <filename>%vendordir%/securetty</filename>. pam_securetty also
+ checks that the <filename>securetty</filename> files are plain
+ files and not world writable. It will also allow root logins on
+ the tty specified with <option>console=</option> switch on the
+ kernel command line and on ttys from the
+ <filename>/sys/class/tty/console/active</filename>.
+ </para>
+ <para>
+ This module has no effect on non-root users and requires that the
+ application fills in the <emphasis remap='B'>PAM_TTY</emphasis>
+ item correctly.
+ </para>
+ <para>
+ For canonical usage, should be listed as a
+ <emphasis remap='B'>required</emphasis> authentication method
+ before any <emphasis remap='B'>sufficient</emphasis>
+ authentication methods.
+ </para>
+ </refsect1>
+
+ <refsect1 id="pam_securetty-options">
+ <title>OPTIONS</title>
+ <variablelist>
+ <varlistentry>
+ <term>
+ <option>debug</option>
+ </term>
+ <listitem>
+ <para>
+ Print debug information.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>noconsole</option>
+ </term>
+ <listitem>
+ <para>
+ 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
+ <filename>securetty</filename> file.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1 id="pam_securetty-types">
+ <title>MODULE TYPES PROVIDED</title>
+ <para>
+ Only the <option>auth</option> module type is provided.
+ </para>
+ </refsect1>
+
+ <refsect1 id='pam_securetty-return_values'>
+ <title>RETURN VALUES</title>
+ <variablelist>
+ <varlistentry>
+ <term>PAM_SUCCESS</term>
+ <listitem>
+ <para>
+ 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.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_AUTH_ERR</term>
+ <listitem>
+ <para>
+ Authentication is rejected. Either root is attempting to
+ log in via an unacceptable device, or the
+ <filename>securetty</filename> file is world writable or
+ not a normal file.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_BUF_ERR</term>
+ <listitem>
+ <para>
+ Memory buffer error.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_CONV_ERR</term>
+ <listitem>
+ <para>
+ The conversation method supplied by the application
+ failed to obtain the username.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_INCOMPLETE</term>
+ <listitem>
+ <para>
+ The conversation method supplied by the application
+ returned PAM_CONV_AGAIN.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_SERVICE_ERR</term>
+ <listitem>
+ <para>
+ An error occurred while the module was determining the
+ user's name or tty, or the module could not open
+ the <filename>securetty</filename> file.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_USER_UNKNOWN</term>
+ <listitem>
+ <para>
+ The module could not find the user name in the
+ <filename>/etc/passwd</filename> file to verify whether
+ the user had a UID of 0. Therefore, the results of running
+ this module are ignored.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1 id='pam_securetty-examples'>
+ <title>EXAMPLES</title>
+ <para>
+ <programlisting>
+auth required pam_securetty.so
+auth required pam_unix.so
+ </programlisting>
+ </para>
+ </refsect1>
+
+ <refsect1 id='pam_securetty-see_also'>
+ <title>SEE ALSO</title>
+ <para>
+ <citerefentry>
+ <refentrytitle>securetty</refentrytitle><manvolnum>5</manvolnum>
+ </citerefentry>,
+ <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_securetty-author'>
+ <title>AUTHOR</title>
+ <para>
+ pam_securetty was written by Elliot Lee &lt;sopwith@cuc.edu&gt;.
+ </para>
+ </refsect1>
+
+</refentry>