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These lines are generally out-of-date, incomplete and unnecessary. With SPDX and git repository much more accurate and fine grained information about licensing and authorship is available, hence let's drop the per-file copyright notice. Of course, removing copyright lines of others is problematic, hence this commit only removes my own lines and leaves all others untouched. It might be nicer if sooner or later those could go away too, making git the only and accurate source of authorship information.
333 lines
14 KiB
XML
333 lines
14 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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SPDX-License-Identifier: LGPL-2.1+
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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 sessions with
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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 — in conjunction with <filename>systemd-logind.service</filename> — ensures the
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following:</para>
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<orderedlist>
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<listitem><para>If it does not exist yet, the user runtime directory <filename>/run/user/$UID</filename> is
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either created or mounted as new <literal>tmpfs</literal> file system with quota applied, and its ownership
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changed to the user that is logging in.</para></listitem>
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<listitem><para>The <varname>$XDG_SESSION_ID</varname> environment variable is initialized. If auditing is
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available and <command>pam_loginuid.so</command> was run before this module (which is highly recommended), the
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variable is initialized from the auditing session id (<filename>/proc/self/sessionid</filename>). Otherwise, an
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independent session counter is used.</para></listitem>
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<listitem><para>A new systemd scope unit is created for the session. If this is the first concurrent session of
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the user, an implicit per-user slice unit below <filename>user.slice</filename> is automatically created and the
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scope placed into it. An instance of the system service <filename>user@.service</filename>, which runs the
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systemd user manager instance, is started. </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> (<varname>KillUserProcesses=</varname>), all processes of the session are
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terminated. If the last concurrent session of a user ends, the user's systemd instance will be terminated too,
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and so will the user's slice unit.</para></listitem>
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<listitem><para>If the last concurrent session of a user ends,
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the user runtime directory <filename>/run/user/$UID</filename> and all its
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contents are removed, too.</para></listitem>
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</orderedlist>
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<para>If the system was not booted up with systemd as init system,
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this module does nothing and immediately returns
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<constant>PAM_SUCCESS</constant>.</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 argument which sets the session
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class. The XDG_SESSION_CLASS environmental variable takes
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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 argument which sets the session
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type. The XDG_SESSION_TYPE environmental variable takes
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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
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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, suitable to be used in
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filenames. The string itself should be considered opaque,
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although often it is just the audit session ID as reported by
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<filename>/proc/self/sessionid</filename>. Each ID will be
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assigned only once during machine uptime. It may hence be used
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to uniquely label files or other 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>$XDG_RUNTIME_DIR</varname></term>
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<listitem><para>Path to a user-private user-writable directory
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that is bound to the user login time on the machine. It is
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automatically created the first time a user logs in and
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removed on the user's final logout. If a user logs in twice at
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the same time, both sessions will see the same
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<varname>$XDG_RUNTIME_DIR</varname> and the same contents. If
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a user logs in once, then logs out again, and logs in again,
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the directory contents will have been lost in between, but
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applications should not rely on this behavior and must be able
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to deal with stale files. To store session-private data in
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this directory, the user should include the value of
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<varname>$XDG_SESSION_ID</varname> in the filename. This
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directory shall be used for runtime file system objects such
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as <constant>AF_UNIX</constant> sockets, FIFOs, PID files and
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similar. It is guaranteed that this directory is local and
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offers the greatest possible file system feature set the
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operating system provides. For further details, see the <ulink
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url="http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html">XDG
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Base Directory Specification</ulink>. <varname>$XDG_RUNTIME_DIR</varname>
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is not set if the current user is not the original user of the session.</para></listitem>
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</varlistentry>
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</variablelist>
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<para>The following environment variables are read by the module
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and may be used by the PAM service to pass metadata to the
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module:</para>
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<variablelist class='environment-variables'>
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<varlistentry>
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<term><varname>$XDG_SESSION_TYPE</varname></term>
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<listitem><para>The session type. This may be used instead of
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<option>session=</option> on the module parameter line, and is
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usually preferred.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>$XDG_SESSION_CLASS</varname></term>
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<listitem><para>The session class. This may be used instead of
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<option>class=</option> on the module parameter line, and is
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usually preferred.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>$XDG_SESSION_DESKTOP</varname></term>
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<listitem><para>A single, short identifier string for the
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desktop environment. This may be used to indicate the session
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desktop used, where this applies and if this information is
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available. For example: <literal>GNOME</literal>, or
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<literal>KDE</literal>. It is recommended to use the same
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identifiers and capitalization as for
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<varname>$XDG_CURRENT_DESKTOP</varname>, as defined by the
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<ulink
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url="http://standards.freedesktop.org/desktop-entry-spec/latest/">Desktop
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Entry Specification</ulink>. (However, note that
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<varname>$XDG_SESSION_DESKTOP</varname> only takes a single
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item, and not a colon-separated list like
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<varname>$XDG_CURRENT_DESKTOP</varname>.) 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>$XDG_SEAT</varname></term>
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<listitem><para>The seat name the session shall be registered
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for, if any.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>$XDG_VTNR</varname></term>
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<listitem><para>The VT number the session shall be registered
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for, if any. (Only applies to seats with a VT available, such
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as <literal>seat0</literal>)</para></listitem>
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</varlistentry>
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</variablelist>
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<para>If not set, <command>pam_systemd</command> will determine the
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values for <varname>$XDG_SEAT</varname> and <varname>$XDG_VTNR</varname>
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based on the <varname>$DISPLAY</varname> variable.</para>
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</refsect1>
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<refsect1>
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<title>Session limits</title>
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<para>PAM modules earlier in the stack, that is those that come before <command>pam_systemd.so</command>,
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can set session scope limits using the PAM context objects. The data for these objects is provided as NUL-terminated C strings
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and maps directly to the respective unit resource control directives. Note that these limits apply to individual sessions of the user,
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they do not apply to all user processes as a combined whole. In particular, the per-user <command>user@.service</command> unit instance,
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which runs the <command>systemd --user</command> manager process and its children, and is tracked outside of any session, being shared
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by all the user's sessions, is not covered by these limits.
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</para>
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<para> See
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<citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry> for more information about the resources.
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Also, see <citerefentry><refentrytitle>pam_set_data</refentrytitle><manvolnum>3</manvolnum></citerefentry> for additional information about how to set
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the context objects.
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</para>
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<variablelist>
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<varlistentry>
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<term><varname>systemd.memory_max</varname></term>
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<listitem><para>Sets unit <varname>MemoryMax=</varname>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>systemd.tasks_max</varname></term>
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<listitem><para>Sets unit <varname>TasksMax=</varname>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>systemd.cpu_weight</varname></term>
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<listitem><para>Sets unit <varname>CPUWeight=</varname>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>systemd.io_weight</varname></term>
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<listitem><para>Sets unit <varname>IOWeight=</varname>.</para></listitem>
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</varlistentry>
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</variablelist>
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<para>Example data as can be provided from an another PAM module:
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<programlisting>
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pam_set_data(handle, "systemd.memory_max", (void *)"200M", cleanup);
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pam_set_data(handle, "systemd.tasks_max", (void *)"50", cleanup);
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pam_set_data(handle, "systemd.cpu_weight", (void *)"100", cleanup);
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pam_set_data(handle, "systemd.io_weight", (void *)"340", cleanup);
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</programlisting>
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</para>
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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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