274 lines
8.9 KiB
XML
274 lines
8.9 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!--
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Copyright (c) 1996 , Rafal Maszkowski
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Copyright (c) 2007 - 2008, 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 ENCRYPT_METHOD SYSTEM "login.defs.d/ENCRYPT_METHOD.xml">
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<!ENTITY MAX_MEMBERS_PER_GROUP SYSTEM "login.defs.d/MAX_MEMBERS_PER_GROUP.xml">
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<!ENTITY MD5_CRYPT_ENAB SYSTEM "login.defs.d/MD5_CRYPT_ENAB.xml">
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<!ENTITY SHA_CRYPT_MIN_ROUNDS SYSTEM "login.defs.d/SHA_CRYPT_MIN_ROUNDS.xml">
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]>
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<refentry id='gpasswd.1'>
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<!-- $Id$ -->
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<refmeta>
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<refentrytitle>gpasswd</refentrytitle>
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<manvolnum>1</manvolnum>
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<refmiscinfo class="sectdesc">User Commands</refmiscinfo>
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</refmeta>
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<refnamediv id='name'>
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<refname>gpasswd</refname>
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<refpurpose>
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administer the <filename>/etc/group</filename>
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<phrase condition="gshadow">and <filename>/etc/gshadow</filename>
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files</phrase>
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<phrase condition="no_gshadow">file</phrase>
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</refpurpose>
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</refnamediv>
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<!-- body begins here -->
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<refsynopsisdiv id='synopsis'>
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<cmdsynopsis>
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<command>gpasswd</command>
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<arg choice='opt'>
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<replaceable>option</replaceable>
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</arg>
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<arg choice='plain'>
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<replaceable>group</replaceable>
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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>gpasswd</command> command is used to administer
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<filename>/etc/group</filename><phrase condition="gshadow">,
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and <filename>/etc/gshadow</filename></phrase>.
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Every group can have
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<phrase condition="gshadow">administrators,</phrase>
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members and a password.
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</para>
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<para condition="gshadow">
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System administrator can use the <option>-A</option> option to define
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group administrator(s) and the <option>-M</option> option to define
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members and has all rights of group administrators and members.
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</para>
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<para>
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<command>gpasswd</command> called by
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<phrase condition="gshadow">a group administrator</phrase>
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<phrase condition="no_gshadow">a system administrator</phrase>
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with a group name only prompts for the new password of the
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<replaceable>group</replaceable>.
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</para>
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<para>
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If a password is set the members can still <citerefentry>
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<refentrytitle>newgrp</refentrytitle><manvolnum>1</manvolnum>
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</citerefentry> without a password, and non-members must supply the
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password.
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</para>
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<refsect2 id='notes_about_group_passwords'>
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<title>Notes about group passwords</title>
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<para>
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Group passwords are an inherent security problem since more than one
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person is permitted to know the password. However, groups are a
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useful tool for permitting co-operation between different users.
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</para>
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</refsect2>
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</refsect1>
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<refsect1 id='options'>
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<title>OPTIONS</title>
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<para condition="gshadow">
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Except for the <option>-A</option> and <option>-M</option> options,
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the options cannot be combined.
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</para>
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<para condition="no_gshadow">
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The options cannot be combined.
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</para>
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<para>
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The options which apply to the <command>gpasswd</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>
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<option>-a</option>, <option>--add</option> <replaceable>user</replaceable>
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</term>
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<listitem>
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<para>
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Add the <replaceable>user</replaceable> to the named
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<replaceable>group</replaceable>.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<variablelist remap='IP'>
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<varlistentry>
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<term>
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<option>-d</option>, <option>--delete</option> <replaceable>user</replaceable>
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</term>
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<listitem>
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<para>
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Remove the <replaceable>user</replaceable> from the named
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<replaceable>group</replaceable>.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<variablelist remap='IP'>
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<varlistentry>
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<term>
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<option>-r</option>, <option>--remove-password</option>
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</term>
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<listitem>
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<para>
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Remove the password from the named <replaceable>group</replaceable>.
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Only group members will be allowed to use
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<command>newgrp</command> to join the named
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<replaceable>group</replaceable>.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<variablelist remap='IP'>
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<varlistentry>
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<term>
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<option>-R</option>, <option>--restrict</option>
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</term>
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<listitem>
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<para>
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Restrict the access to the named <replaceable>group</replaceable>.
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Only group members will be allowed to use
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<command>newgrp</command> to join the named
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<replaceable>group</replaceable>.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<variablelist remap='IP' condition="gshadow">
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<varlistentry>
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<term>
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<option>-A</option>, <option>--administrators</option> <replaceable>user</replaceable>,...
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</term>
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<listitem>
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<para>
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Set the list of administrative users.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<variablelist remap='IP'>
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<varlistentry>
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<term>
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<option>-M</option>, <option>--members</option> <replaceable>user</replaceable>,...
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</term>
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<listitem>
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<para>
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Set the list of group members.
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</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='caveats'>
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<title>CAVEATS</title>
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<para>
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This tool only operates on the <filename>/etc/group</filename>
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<phrase condition="gshadow"> and <filename>/etc/gshadow</filename>
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files.</phrase>
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<phrase condition="no_gshadow">file.</phrase>
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Thus you cannot change any NIS or LDAP group. This must be performed
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on the corresponding server.
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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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&ENCRYPT_METHOD;
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&MAX_MEMBERS_PER_GROUP;
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&MD5_CRYPT_ENAB;
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&SHA_CRYPT_MIN_ROUNDS; <!--This also document SHA_CRYPT_MAX_ROUNDS-->
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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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</variablelist>
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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>newgrp</refentrytitle><manvolnum>1</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>groupadd</refentrytitle><manvolnum>8</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>groupdel</refentrytitle><manvolnum>8</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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<citerefentry>
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<refentrytitle>grpck</refentrytitle><manvolnum>8</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>group</refentrytitle><manvolnum>5</manvolnum>
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</citerefentry><phrase condition="gshadow">,
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<citerefentry>
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<refentrytitle>gshadow</refentrytitle><manvolnum>5</manvolnum>
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</citerefentry></phrase>.
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</para>
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</refsect1>
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</refentry>
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