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c72d5456e2
The desktop brand is stored as DESKTOP variable for sessions. It can be set arbitrarily by the session owner and identifies the desktop environment that is running on that session.
328 lines
16 KiB
XML
328 lines
16 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="pam_systemd" conditional='HAVE_PAM'>
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<refentryinfo>
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<title>pam_systemd</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>pam_systemd</refentrytitle>
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<manvolnum>8</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>pam_systemd</refname>
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<refpurpose>Register user sessions in the systemd login manager</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>pam_systemd.so</filename></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><command>pam_systemd</command> registers user
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sessions with the systemd login manager
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<citerefentry><refentrytitle>systemd-logind.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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and hence the systemd control group hierarchy.</para>
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<para>On login, this module ensures the following:</para>
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<orderedlist>
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<listitem><para>If it does not exist yet, the
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user runtime directory
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<filename>/run/user/$USER</filename> is
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created and its ownership changed to the user
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that is logging in.</para></listitem>
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<listitem><para>The
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<varname>$XDG_SESSION_ID</varname> environment
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variable is initialized. If auditing is
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available and
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<command>pam_loginuid.so</command> run before
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this module (which is highly recommended), the
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variable is initialized from the auditing
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session id
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(<filename>/proc/self/sessionid</filename>). Otherwise
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an independent session counter is
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used.</para></listitem>
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<listitem><para>A new systemd scope unit is
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created for the session. If this is the first
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concurrent session of the user, an implicit
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slice below <filename>user.slice</filename> is
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automatically created and the scope placed in
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it. In instance of the system service
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<filename>user@.service</filename> which runs
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the systemd user manager
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instance.</para></listitem>
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</orderedlist>
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<para>On logout, this module ensures the following:</para>
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<orderedlist>
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<listitem><para>If this is enabled, all
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processes of the session are terminated. If
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the last concurrent session of a user ends, his
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user systemd instance will be terminated too,
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and so will the user's slice
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unit.</para></listitem>
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<listitem><para>If the last concurrent session
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of a user ends, the
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<varname>$XDG_RUNTIME_DIR</varname> directory
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and all its contents are removed,
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too.</para></listitem>
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</orderedlist>
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<para>If the system was not booted up with systemd as
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init system, this module does nothing and immediately
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returns PAM_SUCCESS.</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>The following options are understood:</para>
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<variablelist class='pam-directives'>
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<varlistentry>
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<term><option>class=</option></term>
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<listitem><para>Takes a string
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argument which sets the session class.
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The XDG_SESSION_CLASS environmental variable
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takes precedence. One of
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<literal>user</literal>,
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<literal>greeter</literal>,
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<literal>lock-screen</literal> or
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<literal>background</literal>. See
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<citerefentry><refentrytitle>sd_session_get_class</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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for details about the session class.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>type=</option></term>
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<listitem><para>Takes a string
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argument which sets the session type.
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The XDG_SESSION_TYPE environmental
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variable takes precedence. One of
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<literal>unspecified</literal>,
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<literal>tty</literal>,
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<literal>x11</literal>,
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<literal>wayland</literal> or
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<literal>mir</literal>. See
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<citerefentry><refentrytitle>sd_session_get_type</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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for details about the session type.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>debug<optional>=</optional></option></term>
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<listitem><para>Takes an optional
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boolean argument. If yes or without
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the argument, the module will log
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debugging information as it
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operates.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Module Types Provided</title>
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<para>Only <option>session</option> is provided.</para>
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</refsect1>
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<refsect1>
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<title>Environment</title>
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<para>The following environment variables are set for the processes of the user's session:</para>
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<variablelist class='environment-variables'>
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<varlistentry>
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<term><varname>$XDG_SESSION_ID</varname></term>
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<listitem><para>A session identifier,
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suitable to be used in filenames. The
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string itself should be considered
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opaque, although often it is just the
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audit session ID as reported by
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<filename>/proc/self/sessionid</filename>. Each
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ID will be assigned only once during
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machine uptime. It may hence be used
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to uniquely label files or other
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resources of this
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session.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>$XDG_RUNTIME_DIR</varname></term>
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<listitem><para>Path to a user-private
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user-writable directory that is bound
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to the user login time on the
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machine. It is automatically created
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the first time a user logs in and
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removed on his final logout. If a user
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logs in twice at the same time, both
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sessions will see the same
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<varname>$XDG_RUNTIME_DIR</varname>
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and the same contents. If a user logs
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in once, then logs out again, and logs
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in again, the directory contents will
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have been lost in between, but
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applications should not rely on this
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behavior and must be able to deal with
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stale files. To store session-private
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data in this directory, the user should
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include the value of <varname>$XDG_SESSION_ID</varname>
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in the filename. This directory shall
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be used for runtime file system
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objects such as <constant>AF_UNIX</constant> sockets,
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FIFOs, PID files and similar. It is
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guaranteed that this directory is
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local and offers the greatest possible
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file system feature set the
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operating system
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provides.</para></listitem>
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</varlistentry>
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</variablelist>
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<para>The following environment variables are read by
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the module and may be used by the PAM service to pass
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metadata to the module:</para>
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<variablelist class='environment-variables'>
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<varlistentry>
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<term><varname>$XDG_SESSION_TYPE</varname></term>
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<listitem><para>The session type. This
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may be used instead of
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<option>session=</option> on the
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module parameter line, and is usually
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preferred.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>$XDG_SESSION_CLASS</varname></term>
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<listitem><para>The session class. This
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may be used instead of
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<option>class=</option> on the
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module parameter line, and is usually
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preferred.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>$XDG_SESSION_DESKTOP</varname></term>
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<listitem><para>A single, short
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identifier string for the desktop
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environment. This may be used to
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indicate the session desktop used,
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where this applies and if this
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information is available. For example:
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<literal>GNOME</literal>, or
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<literal>KDE</literal>. It is
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recommended to use the same
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identifiers and capitalization as for
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<varname>$XDG_CURRENT_DESKTOP</varname>,
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as defined by the <ulink
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url="http://standards.freedesktop.org/desktop-entry-spec/latest/">Desktop
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Entry
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Specification</ulink>. See
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<citerefentry><refentrytitle>sd_session_get_desktop</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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for more details.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>$XDG_SEAT</varname></term>
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<listitem><para>The seat name the session
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shall be registered for, if
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any.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>$XDG_VTNR</varname></term>
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<listitem><para>The VT number the
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session shall be registered for, if
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any. (Only applies to seats with a VT
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available, such as
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<literal>seat0</literal>)</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Example</title>
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<programlisting>#%PAM-1.0
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auth required pam_unix.so
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auth required pam_nologin.so
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account required pam_unix.so
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password required pam_unix.so
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session required pam_unix.so
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session required pam_loginuid.so
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session required pam_systemd.so</programlisting>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-logind.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>logind.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>loginctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry project='man-pages'><refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry project='man-pages'><refentrytitle>pam.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry project='man-pages'><refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry project='man-pages'><refentrytitle>pam_loginuid</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.scope</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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