mirror of
https://github.com/systemd/systemd.git
synced 2024-11-05 06:52:22 +03:00
764ae4dd51
This variable is read by the module and can be used instead of the suspend= PAM module parameter. It is also set for the session itself to make debugging easy.
167 lines
7.8 KiB
XML
167 lines
7.8 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
|
|
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
|
|
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
|
|
<!-- SPDX-License-Identifier: LGPL-2.1+ -->
|
|
|
|
<refentry id="pam_systemd_home" conditional='ENABLE_PAM_HOME'>
|
|
|
|
<refentryinfo>
|
|
<title>pam_systemd_home</title>
|
|
<productname>systemd</productname>
|
|
</refentryinfo>
|
|
|
|
<refmeta>
|
|
<refentrytitle>pam_systemd_home</refentrytitle>
|
|
<manvolnum>8</manvolnum>
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>pam_systemd_home</refname>
|
|
<refpurpose>Automatically mount home directories managed by <filename>systemd-homed.service</filename> on
|
|
login, and unmount them on logout</refpurpose>
|
|
</refnamediv>
|
|
|
|
<refsynopsisdiv>
|
|
<para><filename>pam_systemd_home.so</filename></para>
|
|
</refsynopsisdiv>
|
|
|
|
<refsect1>
|
|
<title>Description</title>
|
|
|
|
<para><command>pam_systemd_home</command> ensures that home directories managed by
|
|
<citerefentry><refentrytitle>systemd-homed.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
|
|
are automatically activated (mounted) on user login, and are deactivated (unmounted) when the last
|
|
session of the user ends.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Options</title>
|
|
|
|
<para>The following options are understood:</para>
|
|
|
|
<variablelist class='pam-directives'>
|
|
|
|
<varlistentry>
|
|
<term><varname>suspend=</varname></term>
|
|
|
|
<listitem><para>Takes a boolean argument. If true, the home directory of the user will be suspended
|
|
automatically during system suspend; if false it will remain active. Automatic suspending of the home
|
|
directory improves security substantially as secret key material is automatically removed from memory
|
|
before the system is put to sleep and must be re-acquired (through user re-authentication) when
|
|
coming back from suspend. It is recommended to set this parameter for all PAM applications that have
|
|
support for automatically re-authenticating via PAM on system resume. If multiple sessions of the
|
|
same user are open in parallel the user's home directory will be left unsuspended on system suspend
|
|
as long as at least one of the sessions does not set this parameter to on. Defaults to
|
|
off.</para>
|
|
|
|
<para>Note that TTY logins generally do not support re-authentication on system resume.
|
|
Re-authentication on system resume is primarily a concept implementable in graphical environments, in
|
|
the form of lock screens brought up automatically when the system goes to sleep. This means that if a
|
|
user concurrently uses graphical login sessions that implement the required re-authentication
|
|
mechanism and console logins that do not, the home directory is not locked during suspend, due to the
|
|
logic explained above. That said, it is possible to set this field for TTY logins too, ignoring the
|
|
fact that TTY logins actually don't support the re-authentication mechanism. In that case the TTY
|
|
sessions will appear hung until the user logs in on another virtual terminal (regardless if via
|
|
another TTY session or graphically) which will resume the home directory and unblock the original TTY
|
|
session. (Do note that lack of screen locking on TTY sessions means even though the TTY session
|
|
appears hung, keypresses can still be queued into it, and the existing screen contents be read
|
|
without re-authentication; this limitation is unrelated to the home directory management
|
|
<command>pam_systemd_home</command> and <filename>systemd-homed.service</filename> implement.)</para>
|
|
|
|
<para>Turning this option on by default is highly recommended for all sessions, but only if the
|
|
service managing these sessions correctly implements the aforementioned re-authentication. Note that
|
|
the re-authentication must take place from a component running outside of the user's context, so that
|
|
it does not require access to the user's home directory for operation. Traditionally, most desktop
|
|
environments do not implement screen locking this way, and need to be updated
|
|
accordingly.</para>
|
|
|
|
<para>This setting may also be controlled via the <varname>$SYSTEMD_HOME_SUSPEND</varname>
|
|
environment variable (see below), which <command>pam_systemd_home</command> reads during initialization and sets
|
|
for sessions. If both the environment variable is set and the module parameter specified the latter
|
|
takes precedence.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>debug</varname><optional>=</optional></term>
|
|
|
|
<listitem><para>Takes an optional boolean argument. If yes or without the argument, the module will log
|
|
debugging information as it operates.</para></listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Module Types Provided</title>
|
|
|
|
<para>The module provides all four management operations: <option>auth</option>, <option>account</option>,
|
|
<option>session</option>, <option>password</option>.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Environment</title>
|
|
|
|
<para>The following environment variables are initialized by the module and available to the processes of the
|
|
user's session:</para>
|
|
|
|
<variablelist class='environment-variables'>
|
|
<varlistentry>
|
|
<term><varname>$SYSTEMD_HOME=1</varname></term>
|
|
|
|
<listitem><para>Indicates that the user's home directory is managed by <filename>systemd-homed.service</filename>.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>$SYSTEMD_HOME_SUSPEND=</varname></term>
|
|
|
|
<listitem><para>Indicates whether the session has been registered with the suspend mechanism enabled
|
|
or disabled (see above). The variable's value is either <literal>0</literal> or
|
|
<literal>1</literal>. Note that the module both reads the variable when initializing, and sets it for
|
|
sessions.</para></listitem>
|
|
</varlistentry>
|
|
|
|
</variablelist>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Example</title>
|
|
|
|
<para>Here's an example PAM configuration fragment that permits users managed by
|
|
<filename>systemd-homed.service</filename> to log in:</para>
|
|
|
|
<programlisting>#%PAM-1.0
|
|
auth sufficient pam_unix.so
|
|
<command>-auth sufficient pam_systemd_home.so</command>
|
|
auth required pam_deny.so
|
|
|
|
account required pam_nologin.so
|
|
<command>-account sufficient pam_systemd_home.so</command>
|
|
account sufficient pam_unix.so
|
|
account required pam_permit.so
|
|
|
|
<command>-password sufficient pam_systemd_home.so</command>
|
|
password sufficient pam_unix.so sha512 shadow try_first_pass try_authtok
|
|
password required pam_deny.so
|
|
|
|
-session optional pam_keyinit.so revoke
|
|
-session optional pam_loginuid.so
|
|
<command>-session optional pam_systemd_home.so</command>
|
|
-session optional pam_systemd.so
|
|
session required pam_unix.so</programlisting>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>See Also</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd-homed.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>homed.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>homectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>pam_systemd</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
|
|
<citerefentry project='man-pages'><refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry project='man-pages'><refentrytitle>pam.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry project='man-pages'><refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum></citerefentry>
|
|
</para>
|
|
</refsect1>
|
|
|
|
</refentry>
|