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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-15 20:46:53 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-15 20:46:53 +0000
commit19da58be2d9359a9641381feb559be0b918ef710 (patch)
tree109724175f07436696f51b14b5abbd3f4d704d6d /man/newgidmap.1.xml
parentInitial commit. (diff)
downloadshadow-19da58be2d9359a9641381feb559be0b918ef710.tar.xz
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Adding upstream version 1:4.13+dfsg1.upstream/1%4.13+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ SPDX-FileCopyrightText: 2013 Eric W. Biederman
+ SPDX-License-Identifier: BSD-3-Clause
+-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook V4.5//EN"
+ "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
+<!-- SHADOW-CONFIG-HERE -->
+]>
+
+<refentry id='newgidmap.1'>
+ <refentryinfo>
+ <author>
+ <firstname>Eric</firstname>
+ <surname>Biederman</surname>
+ <contrib>Creation, 2013</contrib>
+ </author>
+ </refentryinfo>
+ <refmeta>
+ <refentrytitle>newgidmap</refentrytitle>
+ <manvolnum>1</manvolnum>
+ <refmiscinfo class="sectdesc">User Commands</refmiscinfo>
+ <refmiscinfo class="source">shadow-utils</refmiscinfo>
+ <refmiscinfo class="version">&SHADOW_UTILS_VERSION;</refmiscinfo>
+ </refmeta>
+ <refnamediv id='name'>
+ <refname>newgidmap</refname>
+ <refpurpose>set the gid mapping of a user namespace</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv id='synopsis'>
+ <cmdsynopsis>
+ <command>newgidmap</command>
+ <arg choice='plain'>
+ <replaceable>pid</replaceable>
+ </arg>
+ <arg choice='plain'>
+ <replaceable>gid</replaceable>
+ </arg>
+ <arg choice='plain'>
+ <replaceable>lowergid</replaceable>
+ </arg>
+ <arg choice='plain'>
+ <replaceable>count</replaceable>
+ </arg>
+ <arg choice='opt'>
+ <arg choice='plain'>
+ <replaceable>gid</replaceable>
+ </arg>
+ <arg choice='plain'>
+ <replaceable>lowergid</replaceable>
+ </arg>
+ <arg choice='plain'>
+ <replaceable>count</replaceable>
+ </arg>
+ <arg choice='opt'>
+ <replaceable>...</replaceable>
+ </arg>
+ </arg>
+ </cmdsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1 id='description'>
+ <title>DESCRIPTION</title>
+ <para>
+ The <command>newgidmap</command> sets <filename>/proc/[pid]/gid_map</filename>
+ based on its command line arguments and the gids allowed. Subgid
+ delegation can either be managed via <filename>/etc/subgid</filename>
+ or through the configured NSS subid module. These options are mutually
+ exclusive.
+ </para>
+
+ <para>
+ Note that the root group is not exempted from the requirement for a valid
+ <filename>/etc/subgid</filename> entry.
+ </para>
+
+ <para>
+ After the pid argument, <command>newgidmap</command> expects sets of 3 integers:
+ <variablelist>
+ <varlistentry>
+ <term>gid</term>
+ <listitem>
+ <para>
+ Beginning of the range of GIDs inside the user namespace.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>lowergid</term>
+ <listitem>
+ <para>
+ Beginning of the range of GIDs outside the user namespace.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>count</term>
+ <listitem>
+ <para>
+ Length of the ranges (both inside and outside the user namespace).
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </para>
+
+ <para>
+ <command>newgidmap</command> verifies that the caller is the owner
+ of the process indicated by <option>pid</option> and that for each
+ of the above sets, each of the GIDs in the range [lowergid,
+ lowergid+count) is allowed to the caller according to
+ <filename>/etc/subgid</filename> before setting
+ <filename>/proc/[pid]/gid_map</filename>.
+ </para>
+ <para>
+ Note that newgidmap may be used only once for a given process.
+ </para>
+
+ </refsect1>
+
+ <refsect1 id='options'>
+ <title>OPTIONS</title>
+ <para>
+ There currently are no options to the <command>newgidmap</command> command.
+ </para>
+ <variablelist remap='IP'>
+ </variablelist>
+ </refsect1>
+
+ <refsect1 id='files'>
+ <title>FILES</title>
+ <variablelist>
+ <varlistentry>
+ <term><filename>/etc/subgid</filename></term>
+ <listitem>
+ <para>List of user's subordinate group IDs.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><filename>/proc/[pid]/gid_map</filename></term>
+ <listitem>
+ <para>Mapping of gids from one between user namespaces.</para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1 id='see_also'>
+ <title>SEE ALSO</title>
+ <para>
+ <citerefentry>
+ <refentrytitle>login.defs</refentrytitle><manvolnum>5</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>newusers</refentrytitle><manvolnum>8</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>subgid</refentrytitle><manvolnum>5</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>