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+<?xml version="1.0" encoding="ISO-8859-1"?>
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
+ "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd">
+
+<refentry id='pam_limits'>
+
+ <refmeta>
+ <refentrytitle>pam_limits</refentrytitle>
+ <manvolnum>8</manvolnum>
+ <refmiscinfo class='setdesc'>Linux-PAM Manual</refmiscinfo>
+ </refmeta>
+
+ <refnamediv id='pam_limits-name'>
+ <refname>pam_limits</refname>
+ <refpurpose>
+ PAM module to limit resources
+ </refpurpose>
+ </refnamediv>
+
+<!-- body begins here -->
+
+ <refsynopsisdiv>
+ <cmdsynopsis id="pam_limits-cmdsynopsis">
+ <command>pam_limits.so</command>
+ <arg choice="opt">
+ change_uid
+ </arg>
+ <arg choice="opt">
+ conf=<replaceable>/path/to/limits.conf</replaceable>
+ </arg>
+ <arg choice="opt">
+ debug
+ </arg>
+ <arg choice="opt">
+ utmp_early
+ </arg>
+ <arg choice="opt">
+ noaudit
+ </arg>
+ </cmdsynopsis>
+ </refsynopsisdiv>
+
+
+ <refsect1 id="pam_limits-description">
+ <title>DESCRIPTION</title>
+ <para>
+ The pam_limits PAM module sets limits on the system resources that can be
+ obtained in a user-session. Users of <emphasis>uid=0</emphasis> are affected
+ by this limits, too.
+ </para>
+ <para>
+ By default limits are taken from the <filename>/etc/security/limits.conf</filename>
+ config file. Then individual files from the <filename>/etc/security/limits.d/</filename>
+ directory are read. The files are parsed one after another in the order of "C" locale.
+ The effect of the individual files is the same as if all the files were
+ concatenated together in the order of parsing.
+ If a config file is explicitely specified with a module option then the
+ files in the above directory are not parsed.
+ </para>
+ <para>
+ The module must not be called by a multithreaded application.
+ </para>
+ <para>
+ If Linux PAM is compiled with audit support the module will report
+ when it denies access based on limit of maximum number of concurrent
+ login sessions.
+ </para>
+ </refsect1>
+
+ <refsect1 id="pam_limits-options">
+ <title>OPTIONS</title>
+ <variablelist>
+ <varlistentry>
+ <term>
+ <option>change_uid</option>
+ </term>
+ <listitem>
+ <para>
+ Change real uid to the user for who the limits are set up. Use this
+ option if you have problems like login not forking a shell for user
+ who has no processes. Be warned that something else may break when
+ you do this.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>conf=<replaceable>/path/to/limits.conf</replaceable></option>
+ </term>
+ <listitem>
+ <para>
+ Indicate an alternative limits.conf style configuration file to
+ override the default.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>debug</option>
+ </term>
+ <listitem>
+ <para>
+ Print debug information.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>utmp_early</option>
+ </term>
+ <listitem>
+ <para>
+ Some broken applications actually allocate a utmp entry for
+ the user before the user is admitted to the system. If some
+ of the services you are configuring PAM for do this, you can
+ selectively use this module argument to compensate for this
+ behavior and at the same time maintain system-wide consistency
+ with a single limits.conf file.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>noaudit</option>
+ </term>
+ <listitem>
+ <para>
+ Do not report exceeded maximum logins count to the audit subsystem.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1 id="pam_limits-services">
+ <title>MODULE SERVICES PROVIDED</title>
+ <para>
+ Only the <option>session</option> service is supported.
+ </para>
+ </refsect1>
+
+ <refsect1 id="pam_limits-return_values">
+ <title>RETURN VALUES</title>
+ <variablelist>
+ <varlistentry>
+ <term>PAM_ABORT</term>
+ <listitem>
+ <para>
+ Cannot get current limits.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_IGNORE</term>
+ <listitem>
+ <para>
+ No limits found for this user.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_PERM_DENIED</term>
+ <listitem>
+ <para>
+ New limits could not be set.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_SERVICE_ERR</term>
+ <listitem>
+ <para>
+ Cannot read config file.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_SESSEION_ERR</term>
+ <listitem>
+ <para>
+ Error recovering account name.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_SUCCESS</term>
+ <listitem>
+ <para>
+ Limits were changed.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_USER_UNKNOWN</term>
+ <listitem>
+ <para>
+ The user is not known to the system.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1 id="pam_limits-files">
+ <title>FILES</title>
+ <variablelist>
+ <varlistentry>
+ <term><filename>/etc/security/limits.conf</filename></term>
+ <listitem>
+ <para>Default configuration file</para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1 id='pam_limits-examples'>
+ <title>EXAMPLES</title>
+ <para>
+ For the services you need resources limits (login for example) put a
+ the following line in <filename>/etc/pam.d/login</filename> as the last
+ line for that service (usually after the pam_unix session line):
+ </para>
+ <programlisting>
+#%PAM-1.0
+#
+# Resource limits imposed on login sessions via pam_limits
+#
+session required pam_limits.so
+ </programlisting>
+ <para>
+ Replace "login" for each service you are using this module.
+ </para>
+ </refsect1>
+
+ <refsect1 id="pam_limits-see_also">
+ <title>SEE ALSO</title>
+ <para>
+ <citerefentry>
+ <refentrytitle>limits.conf</refentrytitle><manvolnum>5</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum>
+ </citerefentry>.
+ </para>
+ </refsect1>
+
+ <refsect1 id="pam_limits-authors">
+ <title>AUTHORS</title>
+ <para>
+ pam_limits was initially written by Cristian Gafton &lt;gafton@redhat.com&gt;
+ </para>
+ </refsect1>
+</refentry>