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e9fbc77c8f
This is useful to exclude root from the session logout killings or to limit killing to the selinux guest users.
380 lines
18 KiB
XML
380 lines
18 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 General Public License as published by
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the Free Software Foundation; either version 2 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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General Public License for more details.
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You should have received a copy of the GNU 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">
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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 control group hierarchy</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>pam_systemd.so</command>
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</cmdsynopsis>
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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 in the systemd control group
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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>/var/run/user/$USER</filename> is
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created and its ownership changed to the user
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that is logging in.</para></listitem>
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<listitem><para>If
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<option>create-session=1</option> is set, the
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<varname>$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>If
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<option>create-session=1</option> is set, a new
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control group
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<filename>/user/$USER/$XDG_SESSION_ID</filename>
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is created and the login process moved into
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it.</para></listitem>
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<listitem><para>If
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<option>create-session=0</option> is set, a new
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control group
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<filename>/user/$USER/user</filename>
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is created and the login process moved into
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it.</para></listitem>
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</orderedlist>
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<para>On logout, this module ensures the following:</para>
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<orderedlist>
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<listitem><para>If
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<varname>$XDG_SESSION_ID</varname> is set and
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<option>kill-session=1</option> specified, all
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remaining processes in the
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<filename>/user/$USER/$XDG_SESSION_ID</filename>
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control group are killed and the control group
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is removed.</para></listitem>
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<listitem><para>If
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<varname>$XDG_SESSION_ID</varname> is set and
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<option>kill-session=0</option> specified, all
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remaining processes in the
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<filename>/user/$USER/$XDG_SESSION_ID</filename>
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control group are migrated to
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<filename>/user/$USER/user</filename> and
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the original control group is
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removed.</para></listitem>
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<listitem><para>If
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<option>kill-user=1</option> is specified, and
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no other user session control group remains,
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except
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<filename>/user/$USER/user</filename>,
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all remaining processes in the
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<filename>/user/$USER</filename> hierarchy
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are killed and the control group is removed.</para></listitem>
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<listitem><para>If
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<option>kill-user=0</option> is specified, and
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no process remains in the
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<filename>/user/$USER</filename> hierarchy the
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control group is removed.</para></listitem>
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<listitem><para>If the
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<filename>/user/$USER</filename> control group
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was removed the
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<varname>$XDG_RUNTIME_DIR</varname> directory
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and all its contents are
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removed, too.</para></listitem>
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</orderedlist>
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<para>If the system was not booted up with systemd as
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init system, this module does nothing and immediately
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returns PAM_SUCCESS.</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>The following options are understood:</para>
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<variablelist>
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<varlistentry>
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<term><option>create-session=</option></term>
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<listitem><para>Takes a boolean
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argument. If true, a new session is
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created: the
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<varname>$XDG_SESSION_ID</varname>
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environment variable is set and the
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login process moved to the
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<filename>/user/$USER/$XDG_SESSION_ID</filename>
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control group. It is recommended that
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all services which are directly created
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on the user's behalf set this
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option. Only for services that shall
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automatically be terminated when the
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user logs out completely, otherwise
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<varname>create-session=0</varname>
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should be set.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>kill-session=</option></term>
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<listitem><para>Takes a boolean
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argument. If true, all processes
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created by the user during his session
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and from his session will be
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terminated when he logs out from his
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session.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>kill-user=</option></term>
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<listitem><para>Takes a boolean
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argument. If true, all processes
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created by the user during his session
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and from his session will be
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terminated after he logged out
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completely. This is a weaker version
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of <option>kill-session=1</option> and is
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more friendly for users logged in more
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than once, as their processes are
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terminated only on their complete
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logout.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>kill-only-users=</option></term>
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<listitem><para>Takes a comma
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separated list of user names or
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numeric user ids as argument. If this
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option is used the effect of the
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<option>kill-session=</option> and
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<option>kill-user=</option> options
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will apply only to the listed
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users. If this option is not used the
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option applies to all local
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users. Note that
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<option>kill-exclude-users=</option>
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takes precedence over this list and is
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hence subtracted from the list
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specified here.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>kill-exclude-users=</option></term>
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<listitem><para>Takes a comma
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separated list of user names or
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numeric user ids as argument. Users
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listed in this argument will not be
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subject to the effect of
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<option>kill-session=</option> or
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<option>kill-user=</option>. Note
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that that this option takes precedence
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over
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<option>kill-only-users=</option>, and
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hence whatever is listed for
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<option>kill-exclude-users=</option>
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is guaranteed to never be killed by
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this PAM module, independent of any
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other configuration
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setting.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>controllers=</option></term>
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<listitem><para>Takes a comma
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separated list of cgroup controllers
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in which hierarchies a user/session
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cgroup will be created by default for
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each user logging in, in addition to
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the cgroup in the named 'name=systemd'
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hierarchy. If ommited, defaults to an
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empty list. This may be used to move
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user sessions into their own groups in
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the 'cpu' hierarchy which ensures that
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every logged in user gets an equal
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amount of CPU time regardless how many
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processes he has
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started.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>reset-controllers=</option></term>
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<listitem><para>Takes a comma
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separated list of cgroup controllers
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in which hierarchies the logged in
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processes will be reset to the root
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cgroup. If ommited, defaults to 'cpu',
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meaning that a 'cpu' cgroup grouping
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inherited from the login manager will
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be reset for the processes of the
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logged in user.</para></listitem>
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</varlistentry>
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</variablelist>
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<para>Note that setting <varname>kill-user=1</varname>
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or even <varname>kill-session=1</varname> will break
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tools like
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<citerefentry><refentrytitle>screen</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
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<para>If the options are omitted they default to
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<option>create-session=1</option>,
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<option>kill-session=0</option>,
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<option>kill-user=0</option>,
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<option>keep-root=1</option>,
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<option>reset-controllers=cpu</option>,
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<option>kill-only-users=</option>,
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<option>kill-exclude-users=root</option>.</para>
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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>
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<varlistentry>
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<term><varname>$XDG_SESSION_ID</varname></term>
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<listitem><para>A session identifier,
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suitable to be used in file names. The
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string itself should be considered
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opaque, although often it is just the
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audit session ID as reported by
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<filename>/proc/self/sessionid</filename>. Each
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ID will be assigned only once during
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machine uptime. It may hence be used
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to uniquely label files or other
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resources of this
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session.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>$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>$XDG_RUNTIME_DIR</varname>
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and the same contents. If a user logs
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in once, then logs out again, and logs
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in again, the directory contents will
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have been lost in between, but
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applications should not rely on this
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behaviour and must be able to deal with
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stale files. To store session-private
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data in this directory the user should
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include the value of <varname>$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 AF_UNIX 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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</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 kill-user=1</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>pam.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>pam.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>pam_loginuid</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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