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man: update pam_systemd page to document new behaviour
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Lennart Poettering
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8fa365e586
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c36eecdfcb
@ -69,8 +69,7 @@
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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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<listitem><para>The
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<varname>$XDG_SESSION_ID</varname> environment
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variable is initialized. If auditing is
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available and
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@ -82,20 +81,10 @@
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an independent session counter is
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used.</para></listitem>
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<listitem><para>If
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<option>create-session=1</option> is set, a new
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control group
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<listitem><para>A new control group
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<filename>/user/$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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@ -103,38 +92,13 @@
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<orderedlist>
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<listitem><para>If
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<varname>$XDG_SESSION_ID</varname> is set and
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<option>kill-session=1</option> specified, all
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<option>kill-session-processes=1</option> specified, all
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remaining processes in the
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<filename>/user/$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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<listitem><para>If last subgroup of 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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@ -155,27 +119,7 @@
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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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<term><option>kill-session-processes=</option></term>
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<listitem><para>Takes a boolean
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argument. If true, all processes
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@ -185,22 +129,6 @@
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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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@ -208,8 +136,7 @@
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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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<option>kill-session-processes=</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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@ -228,8 +155,7 @@
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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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<option>kill-session-processes=</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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@ -245,56 +171,59 @@
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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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separated list of control group
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controllers in which hierarchies a
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user/session control group will be
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created by default for each user
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logging in, in addition to the control
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group in the named 'name=systemd'
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hierarchy. If omitted, 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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empty list.</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 omitted, 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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separated list of control group
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controllers in which hierarchies the
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logged in processes will be reset to
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the root control
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group.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>debug=</option></term>
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<listitem><para>Takes a boolean
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argument. If true, logs debugging
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information.</para></listitem>
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argument. If yes, 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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<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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<para>Note that setting
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<varname>kill-session-processes=1</varname> will break tools
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like
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<citerefentry><refentrytitle>screen</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
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<para>Note that
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<varname>kill-session-processes=1</varname> is a
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stricter version of
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<varname>KillUserProcesses=1</varname> which may be
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configured system-wide in
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<citerefentry><refentrytitle>systemd-logind.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>. The
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former kills processes of a session as soon as it
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ends, the latter kills processes as soon as the last
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session of the user ends.</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>reset-controllers=cpu</option>,
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<option>kill-session-processes=0</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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<option>kill-exclude-users=</option>,
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<option>controllers=</option>,
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<option>reset-controllers=</option>,
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<option>debug=no</option>.</para>
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</refsect1>
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<refsect1>
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@ -369,7 +298,7 @@ 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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session required pam_systemd.so kill-session-processes=1</programlisting>
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</refsect1>
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<refsect1>
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@ -379,6 +308,7 @@ session required pam_systemd.so kill-user=1</programlisting>
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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-logind.conf</refentrytitle><manvolnum>5</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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@ -147,6 +147,20 @@
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<literal>cpu</literal>.</para></listitem>
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</varlistentry>
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</variablelist>
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<para>Note that setting
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<varname>KillUserProcesses=1</varname> will break tools
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like
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<citerefentry><refentrytitle>screen</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para>
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<para>Note that <varname>KillUserProcesses=1</varname>
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is a weaker version of
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<varname>kill-session-processes=1</varname> which may
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be configured per-service for
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<citerefentry><refentrytitle>pam_systemd</refentrytitle><manvolnum>8</manvolnum></citerefentry>. The
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latter kills processes of a session as soon as it
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ends, the former kills processes as soon as the last
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session of the user ends.</para>
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</refsect1>
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<refsect1>
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@ -36,9 +36,9 @@
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*
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* spawn user systemd
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* direct client API
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* add configuration file man page
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* verify access to SetIdleHint
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* add FlushDevices bus call
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* hook up ACL tool for udev
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*
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* udev:
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* drop redundant udev_device_get_is_initialized() use as soon as libudev is fixed
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@ -57,9 +57,9 @@ static int parse_argv(pam_handle_t *handle,
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for (i = 0; i < (unsigned) argc; i++) {
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int k;
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if (startswith(argv[i], "kill-processes=")) {
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if ((k = parse_boolean(argv[i] + 15)) < 0) {
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pam_syslog(handle, LOG_ERR, "Failed to parse kill-processes= argument.");
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if (startswith(argv[i], "kill-session-processes=")) {
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if ((k = parse_boolean(argv[i] + 23)) < 0) {
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pam_syslog(handle, LOG_ERR, "Failed to parse kill-session-processes= argument.");
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return k;
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}
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