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1 | <?xml version='1.0'?> <!--*-nxml-*--> |
2 | <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" | |
3 | "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> | |
4 | ||
5 | <!-- | |
6 | This file is part of systemd. | |
7 | ||
8 | Copyright 2010 Lennart Poettering | |
9 | ||
10 | systemd is free software; you can redistribute it and/or modify it | |
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11 | under the terms of the GNU Lesser General Public License as published by |
12 | the Free Software Foundation; either version 2.1 of the License, or | |
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13 | (at your option) any later version. |
14 | ||
15 | systemd is distributed in the hope that it will be useful, but | |
16 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 18 | Lesser General Public License for more details. |
160cd5c9 | 19 | |
5430f7f2 | 20 | You should have received a copy of the GNU Lesser General Public License |
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21 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
22 | --> | |
23 | ||
47c49034 | 24 | <refentry id="pam_systemd" conditional='HAVE_PAM'> |
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25 | |
26 | <refentryinfo> | |
27 | <title>pam_systemd</title> | |
28 | <productname>systemd</productname> | |
29 | ||
30 | <authorgroup> | |
31 | <author> | |
32 | <contrib>Developer</contrib> | |
33 | <firstname>Lennart</firstname> | |
34 | <surname>Poettering</surname> | |
35 | <email>lennart@poettering.net</email> | |
36 | </author> | |
37 | </authorgroup> | |
38 | </refentryinfo> | |
39 | ||
40 | <refmeta> | |
41 | <refentrytitle>pam_systemd</refentrytitle> | |
42 | <manvolnum>8</manvolnum> | |
43 | </refmeta> | |
44 | ||
45 | <refnamediv> | |
46 | <refname>pam_systemd</refname> | |
af3bccd6 | 47 | <refpurpose>Register user sessions in the systemd login manager</refpurpose> |
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48 | </refnamediv> |
49 | ||
50 | <refsynopsisdiv> | |
e670b166 | 51 | <para><filename>pam_systemd.so</filename></para> |
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52 | </refsynopsisdiv> |
53 | ||
54 | <refsect1> | |
55 | <title>Description</title> | |
56 | ||
57 | <para><command>pam_systemd</command> registers user | |
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58 | sessions in the systemd login manager |
59 | <citerefentry><refentrytitle>systemd-logind.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
60 | and hence the systemd control group hierarchy.</para> | |
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61 | |
62 | <para>On login, this module ensures the following:</para> | |
63 | ||
64 | <orderedlist> | |
af62c704 | 65 | <listitem><para>If it does not exist yet, the |
160cd5c9 | 66 | user runtime directory |
bb29785e | 67 | <filename>/run/user/$USER</filename> is |
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68 | created and its ownership changed to the user |
69 | that is logging in.</para></listitem> | |
70 | ||
c36eecdf | 71 | <listitem><para>The |
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72 | <varname>$XDG_SESSION_ID</varname> environment |
73 | variable is initialized. If auditing is | |
74 | available and | |
75 | <command>pam_loginuid.so</command> run before | |
af62c704 | 76 | this module (which is highly recommended), the |
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77 | variable is initialized from the auditing |
78 | session id | |
79 | (<filename>/proc/self/sessionid</filename>). Otherwise | |
80 | an independent session counter is | |
81 | used.</para></listitem> | |
82 | ||
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83 | <listitem><para>A new systemd scope unit is |
84 | created for the session. If this is the first | |
fbce1139 | 85 | concurrent session of the user, an implicit |
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86 | slice below <filename>user.slice</filename> is |
87 | automatically created and the scope placed in | |
88 | it. In instance of the system service | |
fbce1139 | 89 | <filename>user@.service</filename> which runs |
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90 | the systemd user manager |
91 | instance.</para></listitem> | |
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92 | </orderedlist> |
93 | ||
94 | <para>On logout, this module ensures the following:</para> | |
95 | ||
96 | <orderedlist> | |
fbce1139 | 97 | <listitem><para>If this is enabled, all |
3e2f69b7 | 98 | processes of the session are terminated. If |
fbce1139 | 99 | the last concurrent session of a user ends, his |
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100 | user systemd instance will be terminated too, |
101 | and so will the user's slice | |
102 | unit.</para></listitem> | |
103 | ||
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104 | <listitem><para>If the last concurrent session |
105 | of a user ends, the | |
160cd5c9 | 106 | <varname>$XDG_RUNTIME_DIR</varname> directory |
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107 | and all its contents are removed, |
108 | too.</para></listitem> | |
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109 | </orderedlist> |
110 | ||
111 | <para>If the system was not booted up with systemd as | |
af62c704 | 112 | init system, this module does nothing and immediately |
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113 | returns PAM_SUCCESS.</para> |
114 | ||
115 | </refsect1> | |
116 | ||
117 | <refsect1> | |
118 | <title>Options</title> | |
119 | ||
120 | <para>The following options are understood:</para> | |
121 | ||
ccc9a4f9 | 122 | <variablelist class='pam-directives'> |
0e318cad | 123 | |
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124 | <varlistentry> |
125 | <term><option>class=</option></term> | |
126 | ||
127 | <listitem><para>Takes a string | |
128 | argument which sets the session class. | |
129 | The XDG_SESSION_CLASS environmental variable | |
130 | takes precedence.</para></listitem> | |
131 | </varlistentry> | |
132 | ||
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133 | <varlistentry> |
134 | <term><option>debug=</option></term> | |
135 | ||
136 | <listitem><para>Takes a boolean | |
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137 | argument. If yes, the module will log |
138 | debugging information as it | |
139 | operates.</para></listitem> | |
0e318cad | 140 | </varlistentry> |
160cd5c9 | 141 | </variablelist> |
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142 | </refsect1> |
143 | ||
144 | <refsect1> | |
145 | <title>Module Types Provided</title> | |
146 | ||
147 | <para>Only <option>session</option> is provided.</para> | |
148 | </refsect1> | |
149 | ||
150 | <refsect1> | |
151 | <title>Environment</title> | |
152 | ||
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153 | <para>The following environment variables are set for the processes of the user's session:</para> |
154 | ||
ccc9a4f9 | 155 | <variablelist class='environment-variables'> |
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156 | <varlistentry> |
157 | <term><varname>$XDG_SESSION_ID</varname></term> | |
158 | ||
159 | <listitem><para>A session identifier, | |
e9dd9f95 | 160 | suitable to be used in filenames. The |
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161 | string itself should be considered |
162 | opaque, although often it is just the | |
163 | audit session ID as reported by | |
164 | <filename>/proc/self/sessionid</filename>. Each | |
165 | ID will be assigned only once during | |
166 | machine uptime. It may hence be used | |
167 | to uniquely label files or other | |
168 | resources of this | |
169 | session.</para></listitem> | |
170 | </varlistentry> | |
171 | ||
172 | <varlistentry> | |
173 | <term><varname>$XDG_RUNTIME_DIR</varname></term> | |
174 | ||
175 | <listitem><para>Path to a user-private | |
176 | user-writable directory that is bound | |
177 | to the user login time on the | |
178 | machine. It is automatically created | |
179 | the first time a user logs in and | |
180 | removed on his final logout. If a user | |
181 | logs in twice at the same time, both | |
182 | sessions will see the same | |
183 | <varname>$XDG_RUNTIME_DIR</varname> | |
184 | and the same contents. If a user logs | |
185 | in once, then logs out again, and logs | |
186 | in again, the directory contents will | |
187 | have been lost in between, but | |
188 | applications should not rely on this | |
c5315881 | 189 | behavior and must be able to deal with |
160cd5c9 | 190 | stale files. To store session-private |
e9dd9f95 | 191 | data in this directory, the user should |
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192 | include the value of <varname>$XDG_SESSION_ID</varname> |
193 | in the filename. This directory shall | |
194 | be used for runtime file system | |
74d00578 | 195 | objects such as <constant>AF_UNIX</constant> sockets, |
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196 | FIFOs, PID files and similar. It is |
197 | guaranteed that this directory is | |
198 | local and offers the greatest possible | |
199 | file system feature set the | |
200 | operating system | |
201 | provides.</para></listitem> | |
202 | </varlistentry> | |
203 | </variablelist> | |
204 | </refsect1> | |
205 | ||
206 | <refsect1> | |
207 | <title>Example</title> | |
208 | ||
209 | <programlisting>#%PAM-1.0 | |
210 | auth required pam_unix.so | |
211 | auth required pam_nologin.so | |
212 | account required pam_unix.so | |
213 | password required pam_unix.so | |
214 | session required pam_unix.so | |
215 | session required pam_loginuid.so | |
3e2f69b7 | 216 | session required pam_systemd.so</programlisting> |
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217 | </refsect1> |
218 | ||
219 | <refsect1> | |
220 | <title>See Also</title> | |
221 | <para> | |
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222 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, |
223 | <citerefentry><refentrytitle>systemd-logind.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
224 | <citerefentry><refentrytitle>logind.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>, | |
225 | <citerefentry><refentrytitle>loginctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
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226 | <citerefentry><refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>, |
227 | <citerefentry><refentrytitle>pam.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>, | |
228 | <citerefentry><refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
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229 | <citerefentry><refentrytitle>pam_loginuid</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
230 | <citerefentry><refentrytitle>systemd.scope</refentrytitle><manvolnum>5</manvolnum></citerefentry>, | |
231 | <citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry>, | |
232 | <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry> | |
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233 | </para> |
234 | </refsect1> | |
235 | ||
236 | </refentry> |