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334 lines
16 KiB
XML
334 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> was 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 into
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it. An instance of the system service
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<filename>user@.service</filename>, which runs
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the systemd user manager instance, is started.
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</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 enabled in
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<citerefentry><refentrytitle>logind.conf</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry>, all
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processes of the session are terminated. If
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the last concurrent session of a user ends,
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the user's systemd instance will be
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terminated too, 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>$XDG_RUNTIME_DIR</varname></term>
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<listitem><para>Path to a user-private
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user-writable directory that is bound
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to the user login time on the
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machine. It is automatically created
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the first time a user logs in and
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removed on the user's final logout. If
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a user logs in twice at the same time,
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both sessions will see the same
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<varname>$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
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should include the value of
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<varname>$XDG_SESSION_ID</varname> in
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the filename. This directory shall be
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used for runtime file system objects
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such as <constant>AF_UNIX</constant>
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sockets, FIFOs, PID files and
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similar. It is guaranteed that this
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directory is local and offers the
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greatest possible file system feature
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set the operating system provides. For
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further details see the <ulink
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url="http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html">XDG
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Base Directory
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Specification</ulink>.</para></listitem>
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</varlistentry>
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</variablelist>
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<para>The following environment variables are read by
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the module and may be used by the PAM service to pass
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metadata to the module:</para>
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<variablelist class='environment-variables'>
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<varlistentry>
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<term><varname>$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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