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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 14:22:51 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 14:22:51 +0000
commit9ada0093e92388590c7368600ca4e9e3e376f0d0 (patch)
treea56fe41110023676d7082028cbaa47ca4b6e6164 /modules/pam_namespace/namespace.conf.5.xml
parentInitial commit. (diff)
downloadpam-9ada0093e92388590c7368600ca4e9e3e376f0d0.tar.xz
pam-9ada0093e92388590c7368600ca4e9e3e376f0d0.zip
Adding upstream version 1.5.2.upstream/1.5.2upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+<?xml version="1.0" encoding='UTF-8'?>
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
+ "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd">
+
+<refentry id="namespace.conf">
+
+ <refmeta>
+ <refentrytitle>namespace.conf</refentrytitle>
+ <manvolnum>5</manvolnum>
+ <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo>
+ </refmeta>
+
+ <refnamediv>
+ <refname>namespace.conf</refname>
+ <refpurpose>the namespace configuration file</refpurpose>
+ </refnamediv>
+
+
+ <refsect1 id='namespace.conf-description'>
+ <title>DESCRIPTION</title>
+
+ <para>
+ The <emphasis>pam_namespace.so</emphasis> module allows setup of
+ private namespaces with polyinstantiated directories.
+ Directories can be polyinstantiated based on user name
+ or, in the case of SELinux, user name, sensitivity level or complete security context. If an
+ executable script <filename>/etc/security/namespace.init</filename>
+ exists, it is used to initialize the namespace every time an instance
+ directory is set up and mounted. The script receives the polyinstantiated
+ directory path and the instance directory path as its arguments.
+ </para>
+
+ <para>
+ The <filename>/etc/security/namespace.conf</filename> file specifies
+ which directories are polyinstantiated, how they are polyinstantiated,
+ how instance directories would be named, and any users for whom
+ polyinstantiation would not be performed.
+ </para>
+
+ <para>
+ When someone logs in, the file <filename>namespace.conf</filename> is
+ scanned. Comments are marked by <emphasis>#</emphasis> characters.
+ Each non comment line represents one polyinstantiated
+ directory. The fields are separated by spaces but can be quoted by
+ <emphasis>"</emphasis> characters also escape
+ sequences <emphasis>\b</emphasis>, <emphasis>\n</emphasis>, and
+ <emphasis>\t</emphasis> are recognized. The fields are as follows:
+ </para>
+
+ <para><replaceable>polydir</replaceable> <replaceable>instance_prefix</replaceable> <replaceable>method</replaceable> <replaceable>list_of_uids</replaceable>
+ </para>
+
+ <para>
+ The first field, <replaceable>polydir</replaceable>, is the absolute
+ pathname of the directory to polyinstantiate. The special string
+ <emphasis>$HOME</emphasis> is replaced with the user's home directory,
+ and <emphasis>$USER</emphasis> with the username. This field cannot
+ be blank.
+ </para>
+
+ <para>
+ The second field, <replaceable>instance_prefix</replaceable> is
+ the string prefix used to build the pathname for the instantiation
+ of &lt;polydir&gt;. Depending on the polyinstantiation
+ <replaceable>method</replaceable> it is then appended with
+ "instance differentiation string" to generate the final
+ instance directory path. This directory is created if it did not exist
+ already, and is then bind mounted on the &lt;polydir&gt; to provide an
+ instance of &lt;polydir&gt; based on the &lt;method&gt; column.
+ The special string <emphasis>$HOME</emphasis> is replaced with the
+ user's home directory, and <emphasis>$USER</emphasis> with the username.
+ This field cannot be blank.
+ </para>
+
+ <para>
+ The third field, <replaceable>method</replaceable>, is the method
+ used for polyinstantiation. It can take these values; "user"
+ for polyinstantiation based on user name, "level" for
+ polyinstantiation based on process MLS level and user name, "context" for
+ polyinstantiation based on process security context and user name,
+ "tmpfs" for mounting tmpfs filesystem as an instance dir, and
+ "tmpdir" for creating temporary directory as an instance dir which is
+ removed when the user's session is closed.
+ Methods "context" and "level" are only available with SELinux. This
+ field cannot be blank.
+ </para>
+
+ <para>
+ The fourth field, <replaceable>list_of_uids</replaceable>, is
+ a comma separated list of user names for whom the polyinstantiation
+ is not performed. If left blank, polyinstantiation will be performed
+ for all users. If the list is preceded with a single "~" character,
+ polyinstantiation is performed only for users in the list.
+ </para>
+
+ <para>
+ The <replaceable>method</replaceable> field can contain also following
+ optional flags separated by <emphasis>:</emphasis> characters.
+ </para>
+
+ <para><emphasis>create</emphasis>=<replaceable>mode</replaceable>,<replaceable>owner</replaceable>,<replaceable>group</replaceable>
+ - create the polyinstantiated directory. The mode, owner and group parameters
+ are optional. The default for mode is determined by umask, the default
+ owner is the user whose session is opened, the default group is the
+ primary group of the user.
+ </para>
+
+ <para><emphasis>iscript</emphasis>=<replaceable>path</replaceable>
+ - path to the instance directory init script. The base directory for relative
+ paths is <filename>/etc/security/namespace.d</filename>.
+ </para>
+
+ <para><emphasis>noinit</emphasis>
+ - instance directory init script will not be executed.
+ </para>
+
+ <para><emphasis>shared</emphasis>
+ - the instance directories for "context" and "level" methods will not
+ contain the user name and will be shared among all users.
+ </para>
+
+ <para><emphasis>mntopts</emphasis>=<replaceable>value</replaceable>
+ - value of this flag is passed to the mount call when the tmpfs mount is
+ done. It allows for example the specification of the maximum size of the
+ tmpfs instance that is created by the mount call. In addition to
+ options specified in the <citerefentry>
+ <refentrytitle>tmpfs</refentrytitle><manvolnum>5</manvolnum>
+ </citerefentry> manual the <emphasis>nosuid</emphasis>,
+ <emphasis>noexec</emphasis>, and <emphasis>nodev</emphasis> flags
+ can be used to respectively disable setuid bit effect, disable running
+ executables, and disable devices to be interpreted on the mounted
+ tmpfs filesystem.
+ </para>
+
+ <para>
+ The directory where polyinstantiated instances are to be
+ created, must exist and must have, by default, the mode of 0000. The
+ requirement that the instance parent be of mode 0000 can be overridden
+ with the command line option <emphasis>ignore_instance_parent_mode</emphasis>
+ </para>
+
+ <para>
+ In case of context or level polyinstantiation the SELinux context
+ which is used for polyinstantiation is the context used for executing
+ a new process as obtained by getexeccon. This context must be set
+ by the calling application or <filename>pam_selinux.so</filename>
+ module. If this context is not set the polyinstatiation will be
+ based just on user name.
+ </para>
+
+ <para>
+ The "instance differentiation string" is &lt;user name&gt; for "user"
+ method and &lt;user name&gt;_&lt;raw directory context&gt; for "context"
+ and "level" methods. If the whole string is too long the end of it is
+ replaced with md5sum of itself. Also when command line option
+ <emphasis>gen_hash</emphasis> is used the whole string is replaced
+ with md5sum of itself.
+ </para>
+
+ </refsect1>
+
+ <refsect1 id="namespace.conf-examples">
+ <title>EXAMPLES</title>
+ <para>
+ These are some example lines which might be specified in
+ <filename>/etc/security/namespace.conf</filename>.
+ </para>
+
+ <literallayout>
+ # The following three lines will polyinstantiate /tmp,
+ # /var/tmp and user's home directories. /tmp and /var/tmp
+ # will be polyinstantiated based on the security level
+ # as well as user name, whereas home directory will be
+ # polyinstantiated based on the full security context and user name.
+ # Polyinstantiation will not be performed for user root
+ # and adm for directories /tmp and /var/tmp, whereas home
+ # directories will be polyinstantiated for all users.
+ #
+ # Note that instance directories do not have to reside inside
+ # the polyinstantiated directory. In the examples below,
+ # instances of /tmp will be created in /tmp-inst directory,
+ # where as instances of /var/tmp and users home directories
+ # will reside within the directories that are being
+ # polyinstantiated.
+ #
+ /tmp /tmp-inst/ level root,adm
+ /var/tmp /var/tmp/tmp-inst/ level root,adm
+ $HOME $HOME/$USER.inst/inst- context
+ </literallayout>
+
+ <para>
+ For the &lt;service&gt;s you need polyinstantiation (login for example)
+ put the following line in /etc/pam.d/&lt;service&gt; as the last line for
+ session group:
+ </para>
+
+ <para>
+ session required pam_namespace.so [arguments]
+ </para>
+
+ <para>
+ This module also depends on pam_selinux.so setting the context.
+ </para>
+
+ </refsect1>
+
+ <refsect1 id="namespace.conf-see_also">
+ <title>SEE ALSO</title>
+ <para>
+ <citerefentry><refentrytitle>pam_namespace</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>pam.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+ <refsect1 id="namespace.conf-author">
+ <title>AUTHORS</title>
+ <para>
+ The namespace.conf manual page was written by Janak Desai &lt;janak@us.ibm.com&gt;.
+ More features added by Tomas Mraz &lt;tmraz@redhat.com&gt;.
+ </para>
+ </refsect1>
+</refentry>