f93cf255d4
Closes #238 Update all files to list SPDX license shortname. Most files are BSD 3 clause license. The exceptions are: serge@sl ~/src/shadow$ git grep SPDX-License | grep -v BSD-3-Clause contrib/atudel:# SPDX-License-Identifier: BSD-4-Clause lib/tcbfuncs.c: * SPDX-License-Identifier: 0BSD libmisc/salt.c: * SPDX-License-Identifier: Unlicense src/login_nopam.c: * SPDX-License-Identifier: Unlicense src/nologin.c: * SPDX-License-Identifier: BSD-2-Clause src/vipw.c: * SPDX-License-Identifier: GPL-2.0-or-later Signed-off-by: Serge Hallyn <serge@hallyn.com>
173 lines
4.7 KiB
XML
173 lines
4.7 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!--
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SPDX-FileCopyrightText: 2013 Eric W. Biederman
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SPDX-License-Identifier: BSD-3-Clause
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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='newgidmap.1'>
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<refentryinfo>
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<author>
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<firstname>Eric</firstname>
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<surname>Biederman</surname>
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<contrib>Creation, 2013</contrib>
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</author>
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</refentryinfo>
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<refmeta>
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<refentrytitle>newgidmap</refentrytitle>
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<manvolnum>1</manvolnum>
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<refmiscinfo class="sectdesc">User 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>newgidmap</refname>
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<refpurpose>set the gid mapping of a user namespace</refpurpose>
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</refnamediv>
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<refsynopsisdiv id='synopsis'>
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<cmdsynopsis>
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<command>newgidmap</command>
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<arg choice='plain'>
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<replaceable>pid</replaceable>
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</arg>
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<arg choice='plain'>
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<replaceable>gid</replaceable>
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</arg>
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<arg choice='plain'>
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<replaceable>lowergid</replaceable>
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</arg>
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<arg choice='plain'>
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<replaceable>count</replaceable>
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</arg>
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<arg choice='opt'>
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<arg choice='plain'>
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<replaceable>gid</replaceable>
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</arg>
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<arg choice='plain'>
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<replaceable>lowergid</replaceable>
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</arg>
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<arg choice='plain'>
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<replaceable>count</replaceable>
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</arg>
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<arg choice='opt'>
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<replaceable>...</replaceable>
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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>newgidmap</command> sets <filename>/proc/[pid]/gid_map</filename>
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based on its command line arguments and the gids allowed. Subgid
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delegation can either be managed via <filename>/etc/subgid</filename>
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or through the configured NSS subid module. These options are mutually
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exclusive.
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</para>
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<para>
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Note that the root group is not exempted from the requirement for a valid
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<filename>/etc/subgid</filename> entry.
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</para>
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<para>
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After the pid argument, <command>newgidmap</command> expects sets of 3 integers:
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<variablelist>
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<varlistentry>
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<term>gid</term>
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<listitem>
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<para>
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Beginning of the range of GIDs inside the user namespace.
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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>lowergid</term>
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<listitem>
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<para>
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Beginning of the range of GIDs outside the user namespace.
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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>count</term>
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<listitem>
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<para>
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Length of the ranges (both inside and outside the user namespace).
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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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<para>
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<command>newgidmap</command> verifies that the caller is the owner
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of the process indicated by <option>pid</option> and that for each
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of the above sets, each of the GIDs in the range [lowergid,
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lowergid+count) is allowed to the caller according to
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<filename>/etc/subgid</filename> before setting
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<filename>/proc/[pid]/gid_map</filename>.
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</para>
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<para>
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Note that newgidmap may be used only once for a given process.
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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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There currently are no options to the <command>newgidmap</command> command.
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</para>
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<variablelist remap='IP'>
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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/subgid</filename></term>
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<listitem>
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<para>List of user's 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>/proc/[pid]/gid_map</filename></term>
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<listitem>
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<para>Mapping of gids from one between user namespaces.</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>newusers</refentrytitle><manvolnum>8</manvolnum>
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</citerefentry>,
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<citerefentry>
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<refentrytitle>subgid</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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</para>
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</refsect1>
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</refentry>
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