chiark / gitweb /
man: ipv4 link-local
[elogind.git] / man / pam_systemd.xml
index a98c36b..3022cdb 100644 (file)
@@ -8,20 +8,20 @@
   Copyright 2010 Lennart Poettering
 
   systemd is free software; you can redistribute it and/or modify it
-  under the terms of the GNU General Public License as published by
-  the Free Software Foundation; either version 2 of the License, or
+  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
-  General Public License for more details.
+  Lesser General Public License for more details.
 
-  You should have received a copy of the GNU General Public License
+  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">
+<refentry id="pam_systemd" conditional='HAVE_PAM'>
 
         <refentryinfo>
                 <title>pam_systemd</title>
 
         <refnamediv>
                 <refname>pam_systemd</refname>
-                <refpurpose>Register user sessions in the systemd control group hierarchy</refpurpose>
+                <refpurpose>Register user sessions in the systemd login manager</refpurpose>
         </refnamediv>
 
         <refsynopsisdiv>
-                <cmdsynopsis>
-                        <command>pam_systemd.so</command>
-                </cmdsynopsis>
+                <para><filename>pam_systemd.so</filename></para>
         </refsynopsisdiv>
 
         <refsect1>
                 <title>Description</title>
 
                 <para><command>pam_systemd</command> registers user
-                sessions in the systemd control group
-                hierarchy.</para>
+                sessions with 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
+                        <listitem><para>If it does not exist yet, the
                         user runtime directory
-                        <filename>/var/run/user/$USER</filename> is
+                        <filename>/run/user/$USER</filename> is
                         created and its ownership changed to the user
                         that is logging in.</para></listitem>
 
-                        <listitem><para>If
-                        <option>create-session=1</option> is set the
+                        <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 es recommended), the
+                        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>If
-                        <option>create-session=1</option> is set a new
-                        control group
-                        <filename>/user/$USER/$XDG_SESSION_ID</filename>
-                        is created and the login process moved into
-                        it.</para></listitem>
-
-                        <listitem><para>If
-                        <option>create-session=0</option> is set a new
-                        control group
-                        <filename>/user/$USER/no-session</filename>
-                        is created and the login process moved into
-                        it.</para></listitem>
-
+                        <listitem><para>A new systemd scope unit is
+                        created for the session. If this is the first
+                        concurrent session of the user, an implicit
+                        slice below <filename>user.slice</filename> is
+                        automatically created and the scope placed in
+                        it. In instance of the system service
+                        <filename>user@.service</filename> which runs
+                        the systemd user manager
+                        instance.</para></listitem>
                 </orderedlist>
 
                 <para>On logout, this module ensures the following:</para>
 
                 <orderedlist>
-                        <listitem><para>If
-                        <varname>$XDG_SESSION_ID</varname> is set and
-                        <option>kill-session=1</option> specified, all
-                        remaining processes in the
-                        <filename>/user/$USER/$XDG_SESSION_ID</filename>
-                        control group are killed and the control group
-                        removed.</para></listitem>
-
-                        <listitem><para>If
-                        <varname>$XDG_SESSION_ID</varname> is set and
-                        <option>kill-session=0</option> specified, all
-                        remaining processes in the
-                        <filename>/user/$USER/$XDG_SESSION_ID</filename>
-                        control group are migrated to
-                        <filename>/user/$USER/no-session</filename> and
-                        the original control group
-                        removed.</para></listitem>
-
-                        <listitem><para>If
-                        <option>kill-user=1</option> is specified, and
-                        no other user session control group remains
-                        except
-                        <filename>/user/$USER/no-session</filename>
-                        all remaining processes in the
-                        <filename>/user/$USER</filename> hierarchy
-                        are killed and the control group removed.</para></listitem>
-
-                        <listitem><para>If
-                        <option>kill-user=0</option> is specified, and
-                        no process remains in the
-                        <filename>/user/$USER</filename> hierarchy the
-                        control group is removed.</para></listitem>
-
-                        <listitem><para>If the
-                        <filename>/user/$USER</filename> control group
-                        was removed the
+                        <listitem><para>If this is enabled, all
+                        processes of the session are terminated. If
+                        the last concurrent session of a user ends, his
+                        user systemd instance will be terminated too,
+                        and so will the user's slice
+                        unit.</para></listitem>
+
+                        <listitem><para>If the last concurrent session
+                        of a user ends, the
                         <varname>$XDG_RUNTIME_DIR</varname> directory
-                        and all its contents are
-                        removed, too.</para></listitem>
+                        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
+                init system, this module does nothing and immediately
                 returns PAM_SUCCESS.</para>
 
         </refsect1>
 
                 <para>The following options are understood:</para>
 
-                <variablelist>
+                <variablelist class='pam-directives'>
+
                         <varlistentry>
-                                <term><option>create-session=</option></term>
-
-                                <listitem><para>Takes a boolean
-                                argument. If true, a new session is
-                                created: the
-                                <varname>$XDG_SESSION_ID</varname>
-                                environment variable is set and the
-                                login process moved to the
-                                <filename>/user/$USER/$XDG_SESSION_ID</filename>
-                                control group. It is recommended that
-                                all services that are directly created
-                                on the user's behalf set this
-                                option. Only for services that shall
-                                automatically be terminated when the
-                                user logs out completely otherwise,
-                                <varname>create-session=0</varname>
-                                should be set.</para></listitem>
+                                <term><option>class=</option></term>
+
+                                <listitem><para>Takes a string
+                                argument which sets the session class.
+                                The XDG_SESSION_CLASS environmental variable
+                                takes precedence. One of
+                                <literal>user</literal>,
+                                <literal>greeter</literal>,
+                                <literal>lock-screen</literal> or
+                                <literal>background</literal>. See
+                                <citerefentry><refentrytitle>sd_session_get_class</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+                                for details about the session class.</para></listitem>
                         </varlistentry>
 
                         <varlistentry>
-                                <term><option>kill-session=</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>
+                                <term><option>type=</option></term>
+
+                                <listitem><para>Takes a string
+                                argument which sets the session type.
+                                The XDG_SESSION_TYPE environmental
+                                variable takes precedence. One of
+                                <literal>unspecified</literal>,
+                                <literal>tty</literal>,
+                                <literal>x11</literal> or
+                                <literal>wayland</literal>. See
+                                <citerefentry><refentrytitle>sd_session_get_type</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+                                for details about the session type.</para></listitem>
                         </varlistentry>
 
                         <varlistentry>
-                                <term><option>kill-user=</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 after he logged out
-                                completely. This is a weaker version
-                                of <option>kill-session=1</option> and is
-                                more friendly for users logged in more
-                                than once as their processes are
-                                terminated only on their complete
-                                logout.</para></listitem>
+                                <term><option>debug<optional>=</optional></option></term>
+
+                                <listitem><para>Takes an optional
+                                boolean argument. If yes or without
+                                the argument, the module will log
+                                debugging information as it
+                                operates.</para></listitem>
                         </varlistentry>
                 </variablelist>
-
-                <para>Note that setting <varname>kill-user=1</varname>
-                or even <varname>kill-session=1</varname> will break
-                tools like
-                <citerefentry><refentrytitle>screen</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
-
-                <para>If the options are omitted they default to
-                <option>create-session=1</option>,
-                <option>kill-session=0</option>,
-                <option>kill-user=0</option>.</para>
         </refsect1>
 
         <refsect1>
 
                 <para>The following environment variables are set for the processes of the user's session:</para>
 
-                <variablelist>
+                <variablelist class='environment-variables'>
                         <varlistentry>
                                 <term><varname>$XDG_SESSION_ID</varname></term>
 
                                 <listitem><para>A session identifier,
-                                suitable to be used in file names. The
+                                suitable to be used in filenames. The
                                 string itself should be considered
                                 opaque, although often it is just the
                                 audit session ID as reported by
                                 in again, the directory contents will
                                 have been lost in between, but
                                 applications should not rely on this
-                                behaviour and must be able to deal with
+                                behavior and must be able to deal with
                                 stale files. To store session-private
-                                data in this directory the user should
+                                data in this directory, the user should
                                 include the value of <varname>$XDG_SESSION_ID</varname>
                                 in the filename. This directory shall
                                 be used for runtime file system
-                                objects such as AF_UNIX sockets,
+                                objects such as <constant>AF_UNIX</constant> sockets,
                                 FIFOs, PID files and similar. It is
                                 guaranteed that this directory is
                                 local and offers the greatest possible
                                 operating system
                                 provides.</para></listitem>
                         </varlistentry>
+
+                </variablelist>
+
+                <para>The following environment variables are read by
+                the module and may be used by the PAM service to pass
+                metadata to the module:</para>
+
+                <variablelist class='environment-variables'>
+                        <varlistentry>
+                                <term><varname>$XDG_SESSION_TYPE</varname></term>
+
+                                <listitem><para>The session type. This
+                                may be used instead of
+                                <option>session=</option> on the
+                                module parameter line, and is usually
+                                preferred.</para></listitem>
+                        </varlistentry>
+
+                        <varlistentry>
+                                <term><varname>$XDG_SESSION_CLASS</varname></term>
+
+                                <listitem><para>The session class. This
+                                may be used instead of
+                                <option>class=</option> on the
+                                module parameter line, and is usually
+                                preferred.</para></listitem>
+                        </varlistentry>
+
+                        <varlistentry>
+                                <term><varname>$XDG_SESSION_DESKTOP</varname></term>
+
+                                <listitem><para>The session
+                                deskop. This may be used to indicate
+                                the session desktop used, where this
+                                applies. This should be a short,
+                                lowercase string identifying the
+                                desktop environment used if this
+                                information is available. For example:
+                                <literal>gnome</literal>, or
+                                <literal>kde</literal>.</para></listitem>
+                        </varlistentry>
+
+                        <varlistentry>
+                                <term><varname>$XDG_SEAT</varname></term>
+
+                                <listitem><para>The seat name the session
+                                shall be registered for, if
+                                any.</para></listitem>
+                        </varlistentry>
+
+                        <varlistentry>
+                                <term><varname>$XDG_VTNR</varname></term>
+
+                                <listitem><para>The VT number the
+                                session shall be registered for, if
+                                any. (Only applies to seats with a VT
+                                available, such as
+                                <literal>seat0</literal>)</para></listitem>
+                        </varlistentry>
+
                 </variablelist>
         </refsect1>
 
@@ -285,17 +295,23 @@ 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-user=1</programlisting>
+session    required     pam_systemd.so</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>,
-                        <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+                        <citerefentry><refentrytitle>systemd.scope</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+                        <citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+                        <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
                 </para>
         </refsect1>