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
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
|
<?xml version="1.0" encoding="UTF-8"?>
<!--
Copyright (c) 1992 - 1993, Julianne Frances Haugh
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='grpck.8'>
<!-- $Id$ -->
<refentryinfo>
<author>
<firstname>Julianne Frances</firstname>
<surname>Haugh</surname>
<contrib>Creation, 1992</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>grpck</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>grpck</refname>
<refpurpose>verify integrity of group files</refpurpose>
</refnamediv>
<refsynopsisdiv id='synopsis'>
<cmdsynopsis>
<command>grpck</command>
<arg choice='opt'>options</arg>
<arg choice='opt'>
<arg choice='plain'><replaceable>group</replaceable></arg>
<arg choice='opt' condition="gshadow">
<arg choice='plain'><replaceable>shadow</replaceable></arg>
</arg>
</arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1 id='description'>
<title>DESCRIPTION</title>
<para>
The <command>grpck</command> command verifies the integrity of the
groups information. It checks that all entries in
<filename>/etc/group</filename> <phrase condition="gshadow">and
<filename>/etc/gshadow</filename></phrase>
have the proper format and contain valid data.
The user is prompted to delete entries that are
improperly formatted or which have other uncorrectable errors.
</para>
<para>Checks are made to verify that each entry has:</para>
<itemizedlist mark='bullet'>
<listitem>
<para>the correct number of fields</para>
</listitem>
<listitem>
<para>a unique and valid group name</para>
</listitem>
<listitem>
<para>
a valid group identifier
<phrase condition="gshadow"> (<filename>/etc/group</filename>
only)</phrase>
</para>
</listitem>
<listitem>
<para>
a valid list of members
<phrase condition="gshadow"> and administrators</phrase>
</para>
</listitem>
<listitem condition="gshadow">
<para>
a corresponding entry in the <filename>/etc/gshadow</filename>
file (respectively <filename>/etc/group</filename> for the
<filename>gshadow</filename> checks)
</para>
</listitem>
</itemizedlist>
<para>
The checks for correct number of fields and unique group name are
fatal. If an entry has the wrong number of fields, the user will be
prompted to delete the entire line. If the user does not answer
affirmatively, all further checks are bypassed. An entry with a
duplicated group name is prompted for deletion, but the remaining
checks will still be made. All other errors are warnings and the user
is encouraged to run the <command>groupmod</command> command to
correct the error.
</para>
<para>
The commands which operate on the <filename>/etc/group</filename>
<phrase condition="no_gshadow">file</phrase><phrase
condition="gshadow">and <filename>/etc/gshadow</filename> files</phrase>
are not able to alter corrupted or duplicated entries.
<command>grpck</command> should be used in those circumstances to
remove the offending entries.
</para>
</refsect1>
<refsect1 id='options'>
<title>OPTIONS</title>
<para>
The <option>-r</option> and <option>-s</option> options cannot be
combined.
</para>
<para>
The options which apply to the <command>grpck</command> command are:
</para>
<variablelist remap='IP'>
<varlistentry>
<term><option>-h</option>, <option>--help</option></term>
<listitem>
<para>Display help message and exit.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-r</option>, <option>--read-only</option></term>
<listitem>
<para>
Execute the <command>grpck</command> command in read-only mode.
This causes all questions regarding changes to be answered
<emphasis>no</emphasis> without user intervention.
</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>
<varlistentry>
<term><option>-s</option>, <option>--sort</option></term>
<listitem>
<para>
Sort entries in <filename>/etc/group</filename>
<phrase condition="gshadow">and
<filename>/etc/gshadow</filename></phrase>
by GID.
</para>
</listitem>
</varlistentry>
</variablelist>
<para>
By default, <command>grpck</command> operates on
<filename>/etc/group</filename> <phrase condition="gshadow">and
<filename>/etc/gshadow</filename></phrase>.
The user may select alternate files with the <emphasis
remap='I'>group</emphasis>
<phrase condition="no_gshadow">parameter.</phrase>
<phrase condition="gshadow">and <emphasis remap='I'>shadow</emphasis>
parameters.</phrase>
</para>
</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>
<varlistentry>
<term><filename>/etc/passwd</filename></term>
<listitem>
<para>User account information.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id='exit_values'>
<title>EXIT VALUES</title>
<para>
The <command>grpck</command> command exits with the following values:
<variablelist>
<varlistentry>
<term><replaceable>0</replaceable></term>
<listitem>
<para>success</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable>1</replaceable></term>
<listitem>
<para>invalid command syntax</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable>2</replaceable></term>
<listitem>
<para>one or more bad group entries</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable>3</replaceable></term>
<listitem>
<para>can't open group files</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable>4</replaceable></term>
<listitem>
<para>can't lock group files</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable>5</replaceable></term>
<listitem>
<para>can't update group files</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 id='see_also'>
<title>SEE ALSO</title>
<para>
<citerefentry>
<refentrytitle>group</refentrytitle><manvolnum>5</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>groupmod</refentrytitle><manvolnum>8</manvolnum>
</citerefentry>,
<phrase condition="gshadow">
<citerefentry>
<refentrytitle>gshadow</refentrytitle><manvolnum>5</manvolnum>,
</citerefentry>,
</phrase>
<citerefentry>
<refentrytitle>passwd</refentrytitle><manvolnum>5</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>pwck</refentrytitle><manvolnum>8</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>shadow</refentrytitle><manvolnum>5</manvolnum>
</citerefentry>.
</para>
</refsect1>
</refentry>
|
