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-<?xml version='1.0'?> <!--*-nxml-*-->
-<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
- "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
-
-<!--
- This file is part of systemd.
-
- Copyright 2010 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
--->
-
-<refentry id="pam_systemd">
-
- <refentryinfo>
- <title>pam_systemd</title>
- <productname>systemd</productname>
-
- <authorgroup>
- <author>
- <contrib>Developer</contrib>
- <firstname>Lennart</firstname>
- <surname>Poettering</surname>
- <email>lennart@poettering.net</email>
- </author>
- </authorgroup>
- </refentryinfo>
-
- <refmeta>
- <refentrytitle>pam_systemd</refentrytitle>
- <manvolnum>8</manvolnum>
- </refmeta>
-
- <refnamediv>
- <refname>pam_systemd</refname>
- <refpurpose>Register user sessions in the systemd login manager</refpurpose>
- </refnamediv>
-
- <refsynopsisdiv>
- <cmdsynopsis>
- <command>pam_systemd.so</command>
- </cmdsynopsis>
- </refsynopsisdiv>
-
- <refsect1>
- <title>Description</title>
-
- <para><command>pam_systemd</command> registers user
- sessions in the systemd login manager
- <citerefentry><refentrytitle>systemd-logind.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
- and hence the systemd control group hierarchy.</para>
-
- <para>On login, this module ensures the following:</para>
-
- <orderedlist>
- <listitem><para>If it does not exist yet, the
- user runtime directory
- <filename>/run/user/$USER</filename> is
- created and its ownership changed to the user
- that is logging in.</para></listitem>
-
- <listitem><para>The
- <varname>$XDG_SESSION_ID</varname> environment
- variable is initialized. If auditing is
- available and
- <command>pam_loginuid.so</command> run before
- this module (which is highly recommended), the
- variable is initialized from the auditing
- session id
- (<filename>/proc/self/sessionid</filename>). Otherwise
- an independent session counter is
- used.</para></listitem>
-
- <listitem><para>A new control group
- <filename>/user/$USER/$XDG_SESSION_ID</filename>
- is created and the login process moved into
- it.</para></listitem>
- </orderedlist>
-
- <para>On logout, this module ensures the following:</para>
-
- <orderedlist>
- <listitem><para>If
- <varname>$XDG_SESSION_ID</varname> is set and
- <option>kill-session-processes=1</option> specified, all
- remaining processes in the
- <filename>/user/$USER/$XDG_SESSION_ID</filename>
- control group are killed and the control group
- is removed.</para></listitem>
-
- <listitem><para>If the last subgroup of the
- <filename>/user/$USER</filename> control group
- was removed the
- <varname>$XDG_RUNTIME_DIR</varname> directory
- and all its contents are
- removed, too.</para></listitem>
- </orderedlist>
-
- <para>If the system was not booted up with systemd as
- init system, this module does nothing and immediately
- returns PAM_SUCCESS.</para>
-
- </refsect1>
-
- <refsect1>
- <title>Options</title>
-
- <para>The following options are understood:</para>
-
- <variablelist>
- <varlistentry>
- <term><option>kill-session-processes=</option></term>
-
- <listitem><para>Takes a boolean
- argument. If true, all processes
- created by the user during his session
- and from his session will be
- terminated when he logs out from his
- session.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><option>kill-only-users=</option></term>
-
- <listitem><para>Takes a comma
- separated list of user names or
- numeric user ids as argument. If this
- option is used the effect of the
- <option>kill-session-processes=</option> options
- will apply only to the listed
- users. If this option is not used the
- option applies to all local
- users. Note that
- <option>kill-exclude-users=</option>
- takes precedence over this list and is
- hence subtracted from the list
- specified here.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><option>kill-exclude-users=</option></term>
-
- <listitem><para>Takes a comma
- separated list of user names or
- numeric user ids as argument. Users
- listed in this argument will not be
- subject to the effect of
- <option>kill-session-processes=</option>. Note
- that this option takes precedence
- over
- <option>kill-only-users=</option>, and
- hence whatever is listed for
- <option>kill-exclude-users=</option>
- is guaranteed to never be killed by
- this PAM module, independent of any
- other configuration
- setting.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><option>controllers=</option></term>
-
- <listitem><para>Takes a comma
- separated list of control group
- controllers in which hierarchies a
- user/session control group will be
- created by default for each user
- logging in, in addition to the control
- group in the named 'name=systemd'
- hierarchy. If omitted, defaults to an
- empty list.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><option>reset-controllers=</option></term>
-
- <listitem><para>Takes a comma
- separated list of control group
- controllers in which hierarchies the
- logged in processes will be reset to
- the root control
- group.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><option>debug=</option></term>
-
- <listitem><para>Takes a boolean
- argument. If yes, the module will log
- debugging information as it
- operates.</para></listitem>
- </varlistentry>
- </variablelist>
-
- <para>Note that setting
- <varname>kill-session-processes=1</varname> will break tools
- like
- <citerefentry><refentrytitle>screen</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
-
- <para>Note that
- <varname>kill-session-processes=1</varname> is a
- stricter version of
- <varname>KillUserProcesses=1</varname> which may be
- configured system-wide in
- <citerefentry><refentrytitle>logind.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>. The
- former kills processes of a session as soon as it
- ends, the latter kills processes as soon as the last
- session of the user ends.</para>
-
- <para>If the options are omitted they default to
- <option>kill-session-processes=0</option>,
- <option>kill-only-users=</option>,
- <option>kill-exclude-users=</option>,
- <option>controllers=</option>,
- <option>reset-controllers=</option>,
- <option>debug=no</option>.</para>
- </refsect1>
-
- <refsect1>
- <title>Module Types Provided</title>
-
- <para>Only <option>session</option> is provided.</para>
- </refsect1>
-
- <refsect1>
- <title>Environment</title>
-
- <para>The following environment variables are set for the processes of the user's session:</para>
-
- <variablelist>
- <varlistentry>
- <term><varname>$XDG_SESSION_ID</varname></term>
-
- <listitem><para>A session identifier,
- suitable to be used in file names. The
- string itself should be considered
- opaque, although often it is just the
- audit session ID as reported by
- <filename>/proc/self/sessionid</filename>. Each
- ID will be assigned only once during
- machine uptime. It may hence be used
- to uniquely label files or other
- resources of this
- session.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><varname>$XDG_RUNTIME_DIR</varname></term>
-
- <listitem><para>Path to a user-private
- user-writable directory that is bound
- to the user login time on the
- machine. It is automatically created
- the first time a user logs in and
- removed on his final logout. If a user
- logs in twice at the same time, both
- sessions will see the same
- <varname>$XDG_RUNTIME_DIR</varname>
- and the same contents. If a user logs
- in once, then logs out again, and logs
- in again, the directory contents will
- have been lost in between, but
- applications should not rely on this
- behavior and must be able to deal with
- stale files. To store session-private
- data in this directory the user should
- include the value of <varname>$XDG_SESSION_ID</varname>
- in the filename. This directory shall
- be used for runtime file system
- objects such as AF_UNIX sockets,
- FIFOs, PID files and similar. It is
- guaranteed that this directory is
- local and offers the greatest possible
- file system feature set the
- operating system
- provides.</para></listitem>
- </varlistentry>
- </variablelist>
- </refsect1>
-
- <refsect1>
- <title>Example</title>
-
- <programlisting>#%PAM-1.0
-auth required pam_unix.so
-auth required pam_nologin.so
-account required pam_unix.so
-password required pam_unix.so
-session required pam_unix.so
-session required pam_loginuid.so
-session required pam_systemd.so kill-session-processes=1</programlisting>
- </refsect1>
-
- <refsect1>
- <title>See Also</title>
- <para>
- <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemd-logind.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>logind.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>loginctl</refentrytitle><manvolnum>1</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>,
- <citerefentry><refentrytitle>pam_loginuid</refentrytitle><manvolnum>8</manvolnum></citerefentry>
- </para>
- </refsect1>
-
-</refentry>