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 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>/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>$XDG_SESSION_ID</varname> environment
variable is initialized. If auditing is
available and
an independent session counter is
used.</para></listitem>
- <listitem><para>If
- <option>create-session=1</option> is set, a new
- control group
+ <listitem><para>A new control group
<filename>/user/$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/user</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>$XDG_SESSION_ID</varname> is set and
- <option>kill-session=1</option> specified, all
+ <option>kill-session-processes=1</option> specified, all
remaining processes in the
<filename>/user/$USER/$XDG_SESSION_ID</filename>
control group are killed and the control group
is removed.</para></listitem>
- <listitem><para>If
- <varname>$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/$USER/user</filename> and
- the original control group is
- removed.</para></listitem>
-
- <listitem><para>If
- <option>kill-user=1</option> is specified, and
- no other user session control group remains,
- except
- <filename>/user/$USER/user</filename>,
- all remaining processes in the
- <filename>/user/$USER</filename> hierarchy
- are killed and the control group is removed.</para></listitem>
-
- <listitem><para>If
- <option>kill-user=0</option> is specified, and
- no process remains in the
- <filename>/user/$USER</filename> hierarchy the
- control group is removed.</para></listitem>
-
- <listitem><para>If the
+ <listitem><para>If the last subgroup of the
<filename>/user/$USER</filename> control group
was removed the
<varname>$XDG_RUNTIME_DIR</varname> directory
<para>The following options are understood:</para>
- <variablelist>
- <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 which 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>
- </varlistentry>
-
+ <variablelist class='pam-directives'>
<varlistentry>
- <term><option>kill-session=</option></term>
+ <term><option>kill-session-processes=</option></term>
<listitem><para>Takes a boolean
argument. If true, all processes
</varlistentry>
<varlistentry>
- <term><option>kill-user=</option></term>
+ <term><option>kill-only-users=</option></term>
+
+ <listitem><para>Takes a comma-separated
+ list of usernames 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>
- <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>
+ <varlistentry>
+ <term><option>kill-exclude-users=</option></term>
+
+ <listitem><para>Takes a comma-separated
+ list of usernames 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
- seperated list of cgroup controllers
- in which hierarchies a user/session
- cgroup will be created by defautl for
- each user logging in. If ommited,
- defaults to 'cpu', meaning that in
- addition to creating per-user and
- per-session cgroups in systemd's own
- hierarchy, groups are created in the
- 'cpu' hierarchy, on order to ensure
- that every use and every sessions gets
- an equal amount of CPU time,
- regardless how many processes a user
- or session might
- own.</para></listitem>
+ <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>class=</option></term>
+
+ <listitem><para>Takes a string
+ argument which sets the session class.
+ The XDG_SESSION_CLASS environmental variable
+ takes precedence.</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-user=1</varname>
- or even <varname>kill-session=1</varname> will break
- tools like
+ <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>create-session=1</option>,
- <option>kill-session=0</option>,
- <option>kill-user=0</option>.</para>
+ <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>
<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
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 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>,
- <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+ <citerefentry><refentrytitle>pam_loginuid</refentrytitle><manvolnum>8</manvolnum></citerefentry>
</para>
</refsect1>
~ianmdlvl / elogind.git / blobdiff