e8c44a4c12
'gshadow' man page suggests that "You should use the same list of users as in /etc/group", but not must. Closes #261
325 lines
10 KiB
XML
325 lines
10 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!--
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Copyright (c) 1992 - 1993, Julianne Frances Haugh
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Copyright (c) 2007 - 2011, Nicolas François
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. The name of the copyright holders or contributors may not be used to
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endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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<!ENTITY MAX_MEMBERS_PER_GROUP SYSTEM "login.defs.d/MAX_MEMBERS_PER_GROUP.xml">
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<!-- SHADOW-CONFIG-HERE -->
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]>
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<refentry id='grpck.8'>
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<refentryinfo>
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<author>
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<firstname>Julianne Frances</firstname>
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<surname>Haugh</surname>
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<contrib>Creation, 1992</contrib>
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</author>
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<author>
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<firstname>Thomas</firstname>
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<surname>Kłoczko</surname>
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<email>kloczek@pld.org.pl</email>
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<contrib>shadow-utils maintainer, 2000 - 2007</contrib>
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</author>
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<author>
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<firstname>Nicolas</firstname>
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<surname>François</surname>
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<email>nicolas.francois@centraliens.net</email>
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<contrib>shadow-utils maintainer, 2007 - now</contrib>
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</author>
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</refentryinfo>
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<refmeta>
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<refentrytitle>grpck</refentrytitle>
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<manvolnum>8</manvolnum>
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<refmiscinfo class="sectdesc">System Management Commands</refmiscinfo>
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<refmiscinfo class="source">shadow-utils</refmiscinfo>
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<refmiscinfo class="version">&SHADOW_UTILS_VERSION;</refmiscinfo>
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</refmeta>
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<refnamediv id='name'>
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<refname>grpck</refname>
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<refpurpose>verify integrity of group files</refpurpose>
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</refnamediv>
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<refsynopsisdiv id='synopsis'>
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<cmdsynopsis>
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<command>grpck</command>
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<arg choice='opt'>options</arg>
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<arg choice='opt'>
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<arg choice='plain'><replaceable>group</replaceable></arg>
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<arg choice='opt' condition="gshadow">
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<arg choice='plain'><replaceable>shadow</replaceable></arg>
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</arg>
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</arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1 id='description'>
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<title>DESCRIPTION</title>
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<para>
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The <command>grpck</command> command verifies the integrity of the
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groups information. It checks that all entries in
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<filename>/etc/group</filename> <phrase condition="gshadow">and
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<filename>/etc/gshadow</filename></phrase>
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have the proper format and contain valid data.
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The user is prompted to delete entries that are
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improperly formatted or which have other uncorrectable errors.
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</para>
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<para>Checks are made to verify that each entry has:</para>
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<itemizedlist mark='bullet'>
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<listitem>
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<para>the correct number of fields</para>
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</listitem>
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<listitem>
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<para>a unique and valid group name</para>
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</listitem>
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<listitem>
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<para>
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a valid group identifier
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<phrase condition="gshadow"> (<filename>/etc/group</filename>
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only)</phrase>
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</para>
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</listitem>
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<listitem>
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<para>
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a valid list of members
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<phrase condition="gshadow"> and administrators</phrase>
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</para>
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</listitem>
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<listitem condition="gshadow">
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<para>
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a corresponding entry in the <filename>/etc/gshadow</filename>
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file (respectively <filename>/etc/group</filename> for the
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<filename>gshadow</filename> checks)
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</para>
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</listitem>
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</itemizedlist>
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<para>
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The checks for correct number of fields and unique group name are
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fatal. If an entry has the wrong number of fields, the user will be
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prompted to delete the entire line. If the user does not answer
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affirmatively, all further checks are bypassed. An entry with a
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duplicated group name is prompted for deletion, but the remaining
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checks will still be made. All other errors are warnings and the user
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is encouraged to run the <command>groupmod</command> command to
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correct the error.
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</para>
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<para>
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The commands which operate on the <filename>/etc/group</filename>
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<phrase condition="no_gshadow">file</phrase><phrase
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condition="gshadow">and <filename>/etc/gshadow</filename> files</phrase>
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are not able to alter corrupted or duplicated entries.
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<command>grpck</command> should be used in those circumstances to
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remove the offending entries.
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</para>
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</refsect1>
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<refsect1 id='options'>
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<title>OPTIONS</title>
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<para>
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The <option>-r</option> and <option>-s</option> options cannot be
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combined.
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</para>
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<para>
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The options which apply to the <command>grpck</command> command are:
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</para>
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<variablelist remap='IP'>
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<varlistentry>
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<term><option>-h</option>, <option>--help</option></term>
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<listitem>
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<para>Display help message and exit.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-r</option>, <option>--read-only</option></term>
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<listitem>
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<para>
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Execute the <command>grpck</command> command in read-only mode.
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This causes all questions regarding changes to be answered
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<emphasis>no</emphasis> without user intervention.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>-R</option>, <option>--root</option> <replaceable>CHROOT_DIR</replaceable>
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</term>
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<listitem>
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<para>
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Apply changes in the <replaceable>CHROOT_DIR</replaceable>
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directory and use the configuration files from the
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<replaceable>CHROOT_DIR</replaceable> directory.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-s</option>, <option>--sort</option></term>
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<listitem>
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<para>
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Sort entries in <filename>/etc/group</filename>
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<phrase condition="gshadow">and
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<filename>/etc/gshadow</filename></phrase>
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by GID.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-S</option>, <option>--silence-warnings</option></term>
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<listitem>
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<para>
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Suppress more controversial warnings, in particular warnings about
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inconsistency between group members listed in
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<filename>/etc/group</filename> and
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<filename>/etc/ghadow</filename>.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>
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By default, <command>grpck</command> operates on
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<filename>/etc/group</filename> <phrase condition="gshadow">and
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<filename>/etc/gshadow</filename></phrase>.
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The user may select alternate files with the <emphasis
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remap='I'>group</emphasis>
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<phrase condition="no_gshadow">parameter.</phrase>
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<phrase condition="gshadow">and <emphasis remap='I'>shadow</emphasis>
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parameters.</phrase>
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</para>
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</refsect1>
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<refsect1 id='configuration'>
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<title>CONFIGURATION</title>
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<para>
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The following configuration variables in
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<filename>/etc/login.defs</filename> change the behavior of this
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tool:
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</para>
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<variablelist>
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&MAX_MEMBERS_PER_GROUP;
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</variablelist>
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</refsect1>
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<refsect1 id='files'>
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<title>FILES</title>
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<variablelist>
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<varlistentry>
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<term><filename>/etc/group</filename></term>
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<listitem>
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<para>Group account information.</para>
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</listitem>
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</varlistentry>
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<varlistentry condition="gshadow">
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<term><filename>/etc/gshadow</filename></term>
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<listitem>
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<para>Secure group account information.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><filename>/etc/passwd</filename></term>
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<listitem>
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<para>User account information.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 id='exit_values'>
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<title>EXIT VALUES</title>
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<para>
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The <command>grpck</command> command exits with the following values:
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<variablelist>
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<varlistentry>
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<term><replaceable>0</replaceable></term>
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<listitem>
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<para>success</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable>1</replaceable></term>
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<listitem>
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<para>invalid command syntax</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable>2</replaceable></term>
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<listitem>
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<para>one or more bad group entries</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable>3</replaceable></term>
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<listitem>
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<para>can't open group files</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable>4</replaceable></term>
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<listitem>
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<para>can't lock group files</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable>5</replaceable></term>
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<listitem>
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<para>can't update group files</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1 id='see_also'>
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<title>SEE ALSO</title>
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<para>
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<citerefentry>
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<refentrytitle>group</refentrytitle><manvolnum>5</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>groupmod</refentrytitle><manvolnum>8</manvolnum>
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</citerefentry>,
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<phrase condition="gshadow">
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<citerefentry>
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<refentrytitle>gshadow</refentrytitle><manvolnum>5</manvolnum>,
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</citerefentry>,
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</phrase>
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<citerefentry>
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<refentrytitle>passwd</refentrytitle><manvolnum>5</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>pwck</refentrytitle><manvolnum>8</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>shadow</refentrytitle><manvolnum>5</manvolnum>
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</citerefentry>.
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</para>
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</refsect1>
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</refentry>
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