1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
|
<?xml version="1.0" encoding="UTF-8"?>
<!--
Copyright (c) 2000 , International Business Machines
George Kraft IV, gk4@us.ibm.com, 03/23/2000
Copyright (c) 2005 , Tomasz Kłoczko
Copyright (c) 2007 - 2011, Nicolas François
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. The name of the copyright holders or contributors may not be used to
endorse or promote products derived from this software without
specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook V4.5//EN"
"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
<!ENTITY MAX_MEMBERS_PER_GROUP SYSTEM "login.defs.d/MAX_MEMBERS_PER_GROUP.xml">
<!-- SHADOW-CONFIG-HERE -->
]>
<refentry id='groupmems.8'>
<!-- $Id$ -->
<refentryinfo>
<author>
<firstname>George</firstname>
<surname>Kraft</surname>
<lineage>IV</lineage>
<contrib>Creation, 2000</contrib>
</author>
<author>
<firstname>Thomas</firstname>
<surname>Kłoczko</surname>
<email>kloczek@pld.org.pl</email>
<contrib>shadow-utils maintainer, 2000 - 2007</contrib>
</author>
<author>
<firstname>Nicolas</firstname>
<surname>François</surname>
<email>nicolas.francois@centraliens.net</email>
<contrib>shadow-utils maintainer, 2007 - now</contrib>
</author>
</refentryinfo>
<refmeta>
<refentrytitle>groupmems</refentrytitle>
<manvolnum>8</manvolnum>
<refmiscinfo class="sectdesc">System Management Commands</refmiscinfo>
<refmiscinfo class="source">shadow-utils</refmiscinfo>
<refmiscinfo class="version">&SHADOW_UTILS_VERSION;</refmiscinfo>
</refmeta>
<refnamediv id='name'>
<refname>groupmems</refname>
<refpurpose>administer members of a user's primary group</refpurpose>
</refnamediv>
<refsynopsisdiv id='synopsis'>
<cmdsynopsis>
<command>groupmems</command>
<group choice='plain'>
<arg choice='plain'>-a <replaceable>user_name</replaceable></arg>
<arg choice='plain'>-d <replaceable>user_name</replaceable></arg>
<arg choice='opt'>-g <replaceable>group_name</replaceable></arg>
<arg choice='plain'>-l </arg><arg choice='plain'>-p </arg>
</group>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1 id='description'>
<title>DESCRIPTION</title>
<para>
The <command>groupmems</command> command allows a user to administer
their own group membership list without the requirement of
superuser privileges. The <command>groupmems</command> utility is for
systems that configure its users to be in their own name sake primary
group (i.e., guest / guest).
</para>
<para>Only the superuser, as administrator, can use
<command>groupmems</command> to alter the memberships of other groups.
</para>
</refsect1>
<refsect1 id='options'>
<title>OPTIONS</title>
<para>
The options which apply to the <command>groupmems</command> command
are:
</para>
<variablelist remap='IP'>
<varlistentry>
<term><option>-a</option>, <option>--add</option> <replaceable>user_name</replaceable></term>
<listitem>
<para>Add a user to the group membership list.</para>
<para condition="gshadow">
If the <filename>/etc/gshadow</filename> file exist, and the
group has no entry in the <filename>/etc/gshadow</filename>
file, a new entry will be created.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-d</option>, <option>--delete</option> <replaceable>user_name</replaceable></term>
<listitem>
<para>Delete a user from the group membership list.</para>
<para condition="gshadow">
If the <filename>/etc/gshadow</filename> file exist, the user
will be removed from the list of members and administrators of
the group.
</para>
<para condition="gshadow">
If the <filename>/etc/gshadow</filename> file exist, and the
group has no entry in the <filename>/etc/gshadow</filename>
file, a new entry will be created.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-g</option>, <option>--group</option> <replaceable>group_name</replaceable></term>
<listitem>
<para>The superuser can specify which group membership
list to modify.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-h</option>, <option>--help</option></term>
<listitem>
<para>Display help message and exit.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-l</option>, <option>--list</option></term>
<listitem>
<para>List the group membership list.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-p</option>, <option>--purge</option></term>
<listitem>
<para>Purge all users from the group membership list.</para>
<para condition="gshadow">
If the <filename>/etc/gshadow</filename> file exist, and the
group has no entry in the <filename>/etc/gshadow</filename>
file, a new entry will be created.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>-R</option>, <option>--root</option> <replaceable>CHROOT_DIR</replaceable>
</term>
<listitem>
<para>
Apply changes in the <replaceable>CHROOT_DIR</replaceable>
directory and use the configuration files from the
<replaceable>CHROOT_DIR</replaceable> directory.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id='setup'>
<title>SETUP</title>
<para>
The <command>groupmems</command> executable should be in mode
<literal>2710</literal> as user <emphasis>root</emphasis> and in group
<emphasis>groups</emphasis>. The system administrator can add users to
group <emphasis>groups</emphasis> to allow or disallow them using the
<command>groupmems</command> utility to manage their own group
membership list.
</para>
<programlisting>
$ groupadd -r groups
$ chmod 2710 groupmems
$ chown root.groups groupmems
$ groupmems -g groups -a gk4
</programlisting>
</refsect1>
<refsect1 id='configuration'>
<title>CONFIGURATION</title>
<para>
The following configuration variables in
<filename>/etc/login.defs</filename> change the behavior of this
tool:
</para>
<variablelist>
&MAX_MEMBERS_PER_GROUP;
</variablelist>
</refsect1>
<refsect1 id='files'>
<title>FILES</title>
<variablelist>
<varlistentry>
<term><filename>/etc/group</filename></term>
<listitem>
<para>Group account information.</para>
</listitem>
</varlistentry>
<varlistentry condition="gshadow">
<term><filename>/etc/gshadow</filename></term>
<listitem>
<para>secure group account information</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id='see_also'>
<title>SEE ALSO</title>
<para>
<citerefentry>
<refentrytitle>chfn</refentrytitle><manvolnum>1</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>chsh</refentrytitle><manvolnum>1</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>passwd</refentrytitle><manvolnum>1</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>groupadd</refentrytitle><manvolnum>8</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>groupdel</refentrytitle><manvolnum>8</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>useradd</refentrytitle><manvolnum>8</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>userdel</refentrytitle><manvolnum>8</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>usermod</refentrytitle><manvolnum>8</manvolnum>
</citerefentry>.
</para>
</refsect1>
</refentry>
|
