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Diffstat (limited to 'man/newgidmap.1.xml')
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1 files changed, 190 insertions, 0 deletions
diff --git a/man/newgidmap.1.xml b/man/newgidmap.1.xml new file mode 100644 index 0000000..5fff36f --- /dev/null +++ b/man/newgidmap.1.xml @@ -0,0 +1,190 @@ +<?xml version="1.0" encoding="UTF-8"?> +<!-- + Copyright (c) 2013 Eric W. Biederman + 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" [ +<!-- 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 in <filename>/etc/subgid</filename>. + Note that the root user 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> |