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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_shells">
+
+ <refmeta>
+ <refentrytitle>pam_shells</refentrytitle>
+ <manvolnum>8</manvolnum>
+ <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo>
+ </refmeta>
+
+ <refnamediv id="pam_shells-name">
+ <refname>pam_shells</refname>
+ <refpurpose>PAM module to check for valid login shell</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <cmdsynopsis id="pam_shells-cmdsynopsis">
+ <command>pam_shells.so</command>
+ </cmdsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1 id="pam_shells-description">
+
+ <title>DESCRIPTION</title>
+
+ <para>
+ pam_shells is a PAM module that only allows access to the
+ system if the user's shell is listed in <filename>/etc/shells</filename>.
+ </para>
+ <para>
+ It also checks if <filename>/etc/shells</filename> is a plain
+ file and not world writable.
+ </para>
+ </refsect1>
+
+ <refsect1 id="pam_shells-options">
+
+ <title>OPTIONS</title>
+ <para> This module does not recognise any options.</para>
+ </refsect1>
+
+ <refsect1 id="pam_shells-types">
+ <title>MODULE TYPES PROVIDED</title>
+ <para>
+ The <option>auth</option> and <option>account</option>
+ module types are provided.
+ </para>
+ </refsect1>
+
+ <refsect1 id='pam_shells-return_values'>
+ <title>RETURN VALUES</title>
+ <variablelist>
+ <varlistentry>
+ <term>PAM_AUTH_ERR</term>
+ <listitem>
+ <para>
+ Access to the system was denied.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_SUCCESS</term>
+ <listitem>
+ <para>
+ The user's login shell was listed as valid shell in
+ <filename>/etc/shells</filename>.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_SERVICE_ERR</term>
+ <listitem>
+ <para>
+ The module was not able to get the name of the user.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1 id='pam_shells-examples'>
+ <title>EXAMPLES</title>
+ <para>
+ <programlisting>
+auth required pam_shells.so
+ </programlisting>
+ </para>
+ </refsect1>
+
+ <refsect1 id='pam_shells-see_also'>
+ <title>SEE ALSO</title>
+ <para>
+ <citerefentry>
+ <refentrytitle>shells</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_shells-author'>
+ <title>AUTHOR</title>
+ <para>
+ pam_shells was written by Erik Troan &lt;ewt@redhat.com&gt;.
+ </para>
+ </refsect1>
+
+</refentry>