a113b87c45
Until now only exact username specification in /etc/sub[ug]id file allowed the mapping. This prevented normal use for those users who use multiple usernames with the same UID, as it rejected mapping even though it was allowed for another username with the same UID. This patch initially retains the old behaviour, for performance's sake. In the first pass, new[ug]idmap only searches for exact username match. If that yields no valid results, it continues into another loop, which does UID resolution and comparison. If either definition (numeric UID mapping specification or mapping specification for another username with the same UID as current username) is found, it is used. Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
133 lines
4.5 KiB
XML
133 lines
4.5 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!--
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Copyright (c) 2013 Eric W. Biederman
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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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<!-- SHADOW-CONFIG-HERE -->
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]>
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<refentry id='subgid.5'>
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<refmeta>
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<refentrytitle>subgid</refentrytitle>
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<manvolnum>5</manvolnum>
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<refmiscinfo class="sectdesc">File Formats and Conversions</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>subgid</refname>
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<refpurpose>the subordinate gid file</refpurpose>
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</refnamediv>
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<refsect1 id='description'>
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<title>DESCRIPTION</title>
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<para>
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Each line in <filename>/etc/subgid</filename> contains
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a user name and a range of subordinate group ids that user
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is allowed to use.
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This is specified with three fields delimited by colons
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(<quote>:</quote>).
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These fields are:
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</para>
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<itemizedlist mark='bullet'>
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<listitem>
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<para>login name or UID</para>
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</listitem>
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<listitem>
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<para>numerical subordinate group ID</para>
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</listitem>
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<listitem>
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<para>numerical subordinate group ID count</para>
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</listitem>
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</itemizedlist>
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<para>
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This file specifies the group IDs that ordinary users can use, with
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the <command>newgidmap</command> command, to configure gid mapping
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in a user namespace.
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</para>
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<para>
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Multiple ranges may be specified per user.
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</para>
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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/subgid</filename></term>
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<listitem>
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<para>Per user subordinate group IDs.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><filename>/etc/subgid-</filename></term>
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<listitem>
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<para>Backup file for /etc/subgid.</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>login.defs</refentrytitle><manvolnum>5</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>newgidmap</refentrytitle><manvolnum>1</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>newuidmap</refentrytitle><manvolnum>1</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>newusers</refentrytitle><manvolnum>8</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>subuid</refentrytitle><manvolnum>5</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>useradd</refentrytitle><manvolnum>8</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>userdel</refentrytitle><manvolnum>8</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>usermod</refentrytitle><manvolnum>8</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>user_namespaces</refentrytitle><manvolnum>7</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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