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 book PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
+	"http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
+<book id="mwg">
+  <bookinfo>
+    <title>The Linux-PAM Module Writers' Guide</title>
+    <authorgroup>
+      <author>
+        <firstname>Andrew G.</firstname>
+        <surname>Morgan</surname>
+        <email>morgan@kernel.org</email>
+      </author>
+      <author>
+        <firstname>Thorsten</firstname>
+        <surname>Kukuk</surname>
+        <email>kukuk@thkukuk.de</email>
+      </author>
+    </authorgroup>
+    <releaseinfo>Version 1.1.2, 31. August 2010</releaseinfo>
+    <abstract>
+      <para>
+        This manual documents what a programmer needs to know in order
+        to write a module that conforms to the
+        <emphasis remap='B'>Linux-PAM</emphasis> standard.It also
+        discusses some security issues from the point of view of the
+        module programmer.
+      </para>
+    </abstract>
+  </bookinfo>
+
+  <chapter id="mwg-introduction">
+    <title>Introduction</title>
+    <section id="mwg-introduction-description">
+      <title>Description</title>
+      <para>
+        <emphasis remap='B'>Linux-PAM</emphasis> (Pluggable Authentication
+        Modules for Linux) is a library that enables the local system
+        administrator to choose how individual applications authenticate
+        users. For an overview of the
+        <emphasis remap='B'>Linux-PAM</emphasis> library see the
+        <emphasis>Linux-PAM System Administrators' Guide</emphasis>.
+      </para>
+      <para>
+        A <emphasis remap='B'>Linux-PAM</emphasis> module is a single
+        executable binary file that can be loaded by the
+        <emphasis remap='B'>Linux-PAM</emphasis> interface library.
+        This PAM library is configured locally with a system file,
+        <filename>/etc/pam.conf</filename>, to authenticate a user
+        request via the locally available authentication modules. The
+        modules themselves will usually be located in the directory
+        <filename>/lib/security</filename> (or
+        <filename>/lib64/security</filename>, depending on the architecture)
+        and take the form of dynamically loadable object files (see
+        <citerefentry>
+          <refentrytitle>dlopen</refentrytitle><manvolnum>3</manvolnum>
+        </citerefentry>. Alternatively, the modules can be statically
+        linked into the <emphasis remap='B'>Linux-PAM</emphasis> library;
+        this is mostly to allow <emphasis remap='B'>Linux-PAM</emphasis> to
+        be used on platforms without dynamic linking available, but this is
+        a <emphasis>deprecated</emphasis> functionality. It is the
+        <emphasis remap='B'>Linux-PAM</emphasis> interface that is called
+        by an application and it is the responsibility of the library to
+        locate, load and call the appropriate functions in a
+        <emphasis remap='B'>Linux-PAM</emphasis>-module.
+      </para>
+      <para>
+        Except for the immediate purpose of interacting with the user
+        (entering a password etc..) the module should never call the
+        application directly. This exception requires a "conversation
+        mechanism" which is documented below.
+      </para>
+    </section>
+
+    <section id="mwg-introduction-synopsis">
+      <title>Synopsis</title>
+      <programlisting>
+#include &lt;security/pam_modules.h&gt;
+
+gcc -fPIC -c pam_module.c
+gcc -shared -o pam_module.so pam_module.o -lpam
+      </programlisting>
+    </section>
+  </chapter>
+
+  <chapter id="mwg-expected-by-module">
+    <title>What can be expected by the module</title>
+    <para>
+      Here we list the interface that the conventions that all
+      <emphasis remap='B'>Linux-PAM</emphasis> modules must adhere to.
+    </para>
+    <section id="mwg-expected-by-module-item">
+      <title>
+        Getting and setting <emphasis>PAM_ITEM</emphasis>s and
+        <emphasis>data</emphasis>
+      </title>
+      <para>
+        First, we cover what the module should expect from the
+        <emphasis remap='B'>Linux-PAM</emphasis> library and a
+        <emphasis remap='B'>Linux-PAM</emphasis> aware application.
+        Essentially this is the <filename>libpam.*</filename> library.
+      </para>
+      <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+       href="pam_set_data.xml"/>
+      <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+       href="pam_get_data.xml"/>
+      <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+       href="pam_set_item.xml"/>
+      <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+       href="pam_get_item.xml"/>
+      <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+       href="pam_get_user.xml"/>
+      <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+       href="pam_conv.xml"/>
+      <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+       href="pam_putenv.xml"/>
+      <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+       href="pam_getenv.xml"/>
+      <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+       href="pam_getenvlist.xml"/>
+    </section>
+    <section id="mwg-expected-by-module-other">
+      <title>
+        Other functions provided by <filename>libpam</filename>
+      </title>
+      <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+       href="pam_strerror.xml"/>
+      <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+       href="pam_fail_delay.xml"/>
+    </section>
+  </chapter>
+
+  <chapter id="mwg-expected-of-module">
+    <title>What is expected of a module</title>
+    <para>
+      The module must supply a sub-set of the six functions listed
+      below. Together they define the function of a
+      <emphasis remap='B'>Linux-PAM module</emphasis>. Module developers
+      are strongly urged to read the comments on security that follow
+      this list.
+    </para>
+    <section id="mwg-expected-of-module-overview">
+      <title>Overview</title>
+      <para>
+        The six module functions are grouped into four independent
+        management groups. These groups are as follows:
+        <emphasis>authentication</emphasis>, <emphasis>account</emphasis>,
+        <emphasis>session</emphasis> and <emphasis>password</emphasis>.
+        To be properly defined, a module must define all functions within
+        at least one of these groups. A single module may contain the
+        necessary functions for <emphasis>all</emphasis> four groups.
+      </para>
+      <section id="mwg-expected-of-module-overview-1">
+        <title>Functional independence</title>
+        <para>
+          The independence of the four groups of service a module can
+          offer means that the module should allow for the possibility
+          that any one of these four services may legitimately be called
+          in any order. Thus, the module writer should consider the
+          appropriateness of performing a service without the prior
+          success of some other part of the module.
+        </para>
+        <para>
+          As an informative example, consider the possibility that an
+          application applies to change a user's authentication token,
+          without having first requested that
+          <emphasis remap='B'>Linux-PAM</emphasis> authenticate the
+          user. In some cases this may be deemed appropriate: when
+          <command>root</command> wants to change the authentication
+          token of some lesser user. In other cases it may not be
+          appropriate: when <command>joe</command> maliciously wants
+          to reset <command>alice</command>'s password; or when anyone
+          other than the user themself wishes to reset their
+          <emphasis>KERBEROS</emphasis> authentication token. A policy
+          for this action should be defined by any reasonable
+          authentication scheme, the module writer should consider
+          this when implementing a given module.
+        </para>
+      </section>
+      <section id="mwg-expected-of-module-overview-2">
+        <title>Minimizing administration problems</title>
+        <para>
+          To avoid system administration problems and the poor
+          construction of a <filename>/etc/pam.conf</filename> file,
+          the module developer may define all six of the following
+          functions. For those functions that would not be called,
+          the module should return <errorname>PAM_SERVICE_ERR</errorname>
+          and write an appropriate message to the system log. When
+          this action is deemed inappropriate, the function would
+          simply return <errorname>PAM_IGNORE</errorname>.
+        </para>
+      </section>
+      <section id="mwg-expected-of-module-overview-3">
+        <title>Arguments supplied to the module</title>
+        <para>
+          The <parameter>flags</parameter> argument of each of
+          the following functions can be logically OR'd with
+          <parameter>PAM_SILENT</parameter>, which is used to inform the
+          module to not pass any <emphasis>text</emphasis> (errors or
+          warnings) application.
+        </para>
+        <para>
+          The <parameter>argc</parameter> and <parameter>argv</parameter>
+          arguments are taken from the line appropriate to this
+          module---that is, with the <emphasis>service_name</emphasis>
+          matching that of the application---in the configuration file
+          (see the <emphasis remap='B'>Linux-PAM</emphasis>
+          System Administrators' Guide). Together these two parameters
+          provide the number of arguments and an array of pointers to
+          the individual argument tokens. This will be familiar to C
+          programmers as the ubiquitous method of passing command arguments
+          to the function <function>main()</function>. Note, however, that
+          the first argument (<parameter>argv[0]</parameter>) is a true
+          argument and <emphasis>not</emphasis> the name of the module.
+        </para>
+      </section>
+    </section>
+    <section id="mwg-expected-of-module-auth">
+      <title>Authentication management</title>
+      <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+       href="pam_sm_authenticate.xml"/>
+      <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+       href="pam_sm_setcred.xml"/>
+    </section>
+    <section id="mwg-expected-of-module-acct">
+      <title>Account management</title>
+      <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+       href="pam_sm_acct_mgmt.xml"/>
+    </section>
+    <section id="mwg-expected-of-module-session">
+      <title>Session management</title>
+      <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+       href="pam_sm_open_session.xml"/>
+      <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+       href="pam_sm_close_session.xml"/>
+    </section>
+    <section id="mwg-expected-of-module-chauthtok">
+      <title>Authentication token management</title>
+      <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+       href="pam_sm_chauthtok.xml"/>
+    </section>
+  </chapter>
+
+  <chapter id="mwg-see-options">
+    <title>Generic optional arguments</title>
+    <para>
+      Here we list the generic arguments that all modules can expect to
+      be passed. They are not mandatory, and their absence should be
+      accepted without comment by the module.
+    </para>
+    <variablelist>
+      <varlistentry>
+        <term>debug</term>
+        <listitem>
+           <para>
+             Use the <citerefentry>
+             <refentrytitle>pam_syslog</refentrytitle><manvolnum>3</manvolnum>
+             </citerefentry> call to log debugging information to the system
+             log files.
+          </para>
+        </listitem>
+      </varlistentry>
+      <varlistentry>
+        <term>use_first_pass</term>
+        <listitem>
+           <para>
+             The module should not prompt the user for a password.
+             Instead, it should obtain the previously typed password
+             (by a call to <function>pam_get_item()</function> for the
+             <parameter>PAM_AUTHTOK</parameter> item), and use that. If
+             that doesn't work, then the user will not be authenticated.
+             (This option is intended for <command>auth</command> and
+             <command>passwd</command> modules only).
+          </para>
+        </listitem>
+      </varlistentry>
+    </variablelist>
+  </chapter>
+
+  <chapter id="mwg-see-programming">
+    <title>Programming notes</title>
+    <para>
+      Here we collect some pointers for the module writer to bear in mind
+      when writing/developing a <emphasis remap='B'>Linux-PAM</emphasis>
+      compatible module.
+    </para>
+
+    <section id="mwg-see-programming-sec">
+      <title>Security issues for module creation</title>
+      <section id="mwg-see-programming-sec-res">
+        <title>Sufficient resources</title>
+        <para>
+          Care should be taken to ensure that the proper execution
+          of a module is not compromised by a lack of system resources.
+          If a module is unable to open sufficient files to perform its
+          task, it should fail gracefully, or request additional resources.
+          Specifically, the quantities manipulated by the <citerefentry>
+          <refentrytitle>setrlimit</refentrytitle><manvolnum>2</manvolnum>
+          </citerefentry> family of commands should be taken into
+          consideration.
+        </para>
+      </section>
+      <section id="mwg-see-programming-sec-who">
+        <title>Who´s who?</title>
+        <para>
+          Generally, the module may wish to establish the identity of
+          the user requesting a service. This may not be the same as
+          the username returned by <function>pam_get_user()</function>.
+          Indeed, that is only going to be the name of the user under
+          whose identity the service will be given. This is not
+          necessarily the user that requests the service.
+        </para>
+        <para>
+          In other words, user X runs a program that is setuid-Y, it
+          grants the user to have the permissions of Z. A specific example
+          of this sort of service request is the <command>su</command>
+          program: user <command>joe</command> executes
+          <command>su</command> to become the user <command>jane</command>.
+          In this situation X=<command>joe</command>, Y=<command>root</command>
+          and Z=<command>jane</command>. Clearly, it is important that
+          the module does not confuse these different users and grant an
+          inappropriate level of privilege.
+        </para>
+        <para>
+          The following is the convention to be adhered to when juggling
+          user-identities.
+        </para>
+        <itemizedlist>
+          <listitem>
+            <para>
+              X, the identity of the user invoking the service request.
+              This is the user identifier; returned by the function
+              <citerefentry>
+                <refentrytitle>getuid</refentrytitle><manvolnum>2</manvolnum>
+              </citerefentry>.
+            </para>
+          </listitem>
+          <listitem>
+            <para>
+              Y, the privileged identity of the application used to
+              grant the requested service. This is the
+              <emphasis>effective</emphasis> user identifier;
+              returned by the function <citerefentry>
+              <refentrytitle>geteuid</refentrytitle><manvolnum>2</manvolnum>
+              </citerefentry>.
+            </para>
+          </listitem>
+          <listitem>
+            <para>
+              Z, the user under whose identity the service will be granted.
+              This is the username returned by
+              <function>pam_get_user()</function> and also stored in the
+              <emphasis remap='B'>Linux-PAM</emphasis> item,
+              <emphasis>PAM_USER</emphasis>.
+            </para>
+          </listitem>
+          <listitem>
+            <para>
+              <emphasis remap='B'>Linux-PAM</emphasis> has a place for
+              an additional user identity that a module may care to make
+              use of. This is the <emphasis>PAM_RUSER</emphasis> item.
+              Generally, network sensitive modules/applications may wish
+              to set/read this item to establish the identity of the user
+              requesting a service from a remote location.
+            </para>
+          </listitem>
+        </itemizedlist>
+        <para>
+          Note, if a module wishes to modify the identity of either the
+          <emphasis>uid</emphasis> or <emphasis>euid</emphasis> of the
+          running process, it should take care to restore the original
+          values prior to returning control to the
+          <emphasis remap='B'>Linux-PAM</emphasis> library.
+        </para>
+      </section>
+      <section id="mwg-see-programming-sec-conv">
+        <title>Using the conversation function</title>
+        <para>
+          Prior to calling the conversation function, the module should
+          reset the contents of the pointer that will return the applications
+          response. This is a good idea since the application may fail
+          to fill the pointer and the module should be in a position to
+          notice!
+        </para>
+        <para>
+          The module should be prepared for a failure from the
+          conversation. The generic error would be
+          <emphasis>PAM_CONV_ERR</emphasis>, but anything other than
+          <emphasis>PAM_SUCCESS</emphasis> should be treated as
+          indicating failure.
+        </para>
+      </section>
+      <section id="mwg-see-programming-sec-token">
+        <title>Authentication tokens</title>
+        <para>
+          To ensure that the authentication tokens are not left lying
+          around the items, <emphasis>PAM_AUTHTOK</emphasis> and
+          <emphasis>PAM_OLDAUTHTOK</emphasis>, are not available to
+          the application: they are defined in
+          <filename>&lt;security/pam_modules.h&gt;</filename>. This
+          is ostensibly for security reasons, but a maliciously
+          programmed application will always have access to all memory
+          of the process, so it is only superficially enforced. As a
+          general rule the module should overwrite authentication tokens
+          as soon as they are no longer needed. Especially before
+          <function>free()</function>'ing them. The
+          <emphasis remap='B'>Linux-PAM</emphasis> library is
+          required to do this when either of these authentication
+          token items are (re)set.
+        </para>
+        <para>
+          Not to dwell too little on this concern; should the module
+          store the authentication tokens either as (automatic) function
+          variables or using <function>pam_[gs]et_data()</function> the
+          associated memory should be over-written explicitly before it
+          is released. In the case of the latter storage mechanism, the
+          associated <function>cleanup()</function> function should
+          explicitly overwrite the <varname>*data</varname> before
+          <function>free()</function>'ing it: for example,
+          <programlisting>
+/*
+ * An example cleanup() function for releasing memory that was used to
+ * store a password.
+ */
+
+int cleanup(pam_handle_t *pamh, void *data, int error_status)
+{
+    char *xx;
+
+    if ((xx = data)) {
+        while (*xx)
+            *xx++ = '\0';
+        free(data);
+    }
+    return PAM_SUCCESS;
+}
+          </programlisting>
+        </para>
+      </section>
+    </section>
+    <section id="mwg-see-programming-syslog">
+      <title>Use of <citerefentry>
+        <refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum>
+      </citerefentry></title>
+      <para>
+        Only rarely should error information be directed to the user.
+        Usually, this is to be limited to
+        <quote><emphasis>sorry you cannot login now</emphasis></quote>
+        type messages. Information concerning errors in the configuration
+        file, <filename>/etc/pam.conf</filename>, or due to some system
+        failure encountered by the module, should be written to
+        <citerefentry>
+        <refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum>
+        </citerefentry> with <emphasis>facility-type</emphasis>
+        <emphasis remap='B'>LOG_AUTHPRIV</emphasis>.
+      </para>
+      <para>
+        With a few exceptions, the level of logging is, at the discretion
+        of the module developer. Here is the recommended usage of different
+        logging levels:
+      </para>
+      <itemizedlist>
+        <listitem>
+          <para>
+            As a general rule, errors encountered by a module should be
+            logged at the <emphasis>LOG_ERR</emphasis> level. However,
+            information regarding an unrecognized argument, passed to a
+            module from an entry in the <filename>/etc/pam.conf</filename>
+            file, is <emphasis>required</emphasis> to be logged at the
+            <emphasis>LOG_ERR</emphasis> level.
+          </para>
+        </listitem>
+        <listitem>
+          <para>
+            Debugging information, as activated by the
+            <command>debug</command> argument to the module in
+            <filename>/etc/pam.conf</filename>, should be logged
+            at the <emphasis>LOG_DEBUG</emphasis> level.
+          </para>
+        </listitem>
+        <listitem>
+          <para>
+            If a module discovers that its personal configuration
+            file or some system file it uses for information is
+            corrupted or somehow unusable, it should indicate this
+            by logging messages at level, <emphasis>LOG_ALERT</emphasis>.
+          </para>
+        </listitem>
+        <listitem>
+          <para>
+            Shortages of system resources, such as a failure to
+            manipulate a file or <function>malloc()</function> failures
+            should be logged at level <emphasis>LOG_CRIT</emphasis>.
+          </para>
+        </listitem>
+        <listitem>
+          <para>
+            Authentication failures, associated with an incorrectly
+            typed password should be logged at level,
+            <emphasis>LOG_NOTICE</emphasis>.
+          </para>
+        </listitem>
+      </itemizedlist>
+    </section>
+    <section id="mwg-see-programming-libs">
+      <title>Modules that require system libraries</title>
+      <para>
+        Writing a module is much like writing an application. You
+        have to provide the "conventional hooks" for it to work
+        correctly, like <function>pam_sm_authenticate()</function>
+        etc., which would correspond to the <function>main()</function>
+        function in a normal function.
+      </para>
+      <para>
+        Typically, the author may want to link against some standard system
+        libraries. As when one compiles a normal program, this can be
+        done for modules too: you simply append the
+        <parameter>-l</parameter><emphasis>XXX</emphasis> arguments
+        for the desired libraries when you create the shared module object.
+        To make sure a module is linked to the
+        <command>libwhatever.so</command> library
+        when it is <function>dlopen()</function>ed, try:
+        <programlisting>
+% gcc -shared -o pam_module.so pam_module.o -lwhatever
+        </programlisting>
+      </para>
+    </section>
+  </chapter>
+
+  <chapter id="mwg-example">
+    <title>An example module</title>
+    <para>
+      At some point, we may include a fully commented example of a module in
+      this document. For now, please look at the modules directory of the
+      <emphasis remap='B'>Linux-PAM</emphasis> sources.
+    </para>
+  </chapter>
+
+  <chapter id="mwg-see-also">
+    <title>See also</title>
+    <itemizedlist>
+      <listitem>
+        <para>
+          The Linux-PAM System Administrators' Guide.
+        </para>
+      </listitem>
+      <listitem>
+        <para>
+          The Linux-PAM Application Developers' Guide.
+        </para>
+      </listitem>
+      <listitem>
+        <para>
+          The V. Samar and R. Schemers (SunSoft), ``UNIFIED LOGIN WITH
+          PLUGGABLE AUTHENTICATION MODULES'', Open Software Foundation
+          Request For Comments 86.0, October 1995.
+        </para>
+      </listitem>
+    </itemizedlist>
+  </chapter>
+
+  <chapter id='mwg-author'>
+    <title>Author/acknowledgments</title>
+    <para>
+      This document was written by Andrew G. Morgan (morgan@kernel.org)
+      with many contributions from
+      Chris Adams, Peter Allgeyer, Tim Baverstock, Tim Berger, Craig S. Bell,
+      Derrick J. Brashear, Ben Buxton, Seth Chaiklin, Oliver Crow, Chris Dent,
+      Marc Ewing, Cristian Gafton, Emmanuel Galanos, Brad M. Garcia,
+      Eric Hester, Roger Hu, Eric Jacksch, Michael K. Johnson, David Kinchlea,
+      Olaf Kirch, Marcin Korzonek, Thorsten Kukuk, Stephen Langasek,
+      Nicolai Langfeldt, Elliot Lee, Luke Kenneth Casson Leighton,
+      Al Longyear, Ingo Luetkebohle, Marek Michalkiewicz, Robert Milkowski,
+      Aleph One, Martin Pool, Sean Reifschneider, Jan Rekorajski, Erik Troan,
+      Theodore Ts'o, Jeff Uphoff, Myles Uyema, Savochkin Andrey Vladimirovich,
+      Ronald Wahl, David Wood, John Wilmes, Joseph S. D. Yao
+      and Alex O. Yuriev.
+    </para>
+    <para>
+      Thanks are also due to Sun Microsystems, especially to Vipin Samar and
+      Charlie Lai for their advice. At an early stage in the development of
+      <emphasis remap='B'>Linux-PAM</emphasis>, Sun graciously made the
+      documentation for their implementation of PAM available. This act
+      greatly accelerated the development of
+      <emphasis remap='B'>Linux-PAM</emphasis>.
+    </para>
+  </chapter>
+
+  <chapter id='mwg-copyright'>
+    <title>Copyright information for this document</title>
+    <programlisting>
+Copyright (c) 2006 Thorsten Kukuk &lt;kukuk@thkukuk.de&gt;
+Copyright (c) 1996-2002 Andrew G. Morgan &lt;morgan@kernel.org&gt;
+    </programlisting>
+    <para>
+      Redistribution and use in source and binary forms, with or without
+      modification, are permitted provided that the following conditions are
+      met:
+    </para>
+    <programlisting>
+1. Redistributions of source code must retain the above copyright
+   notice, and the entire permission notice in its entirety,
+   including the disclaimer of warranties.
+
+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 author may not be used to endorse or promote
+   products derived from this software without specific prior
+   written permission.
+    </programlisting>
+    <para>
+      Alternatively, this product may be distributed under the terms of
+      the GNU General Public License (GPL), in which case the provisions
+      of the GNU GPL are required instead of the above restrictions.
+      (This clause is necessary due to a potential bad interaction between
+      the GNU GPL and the restrictions contained in a BSD-style copyright.)
+    </para>
+    <programlisting>
+THIS SOFTWARE IS PROVIDED ``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 AUTHOR 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
+    </programlisting>
+  </chapter>
+</book>
diff --git a/doc/mwg/Makefile.am b/doc/mwg/Makefile.am
new file mode 100644
index 0000000..2bbb2d0
--- /dev/null
+++ b/doc/mwg/Makefile.am
@@ -0,0 +1,113 @@
+#
+# Copyright (c) 2006 Thorsten Kukuk <kukuk@thkukuk.de>
+#
+
+CLEANFILES = Linux-PAM_MWG.fo *~
+
+EXTRA_DIST = $(XMLS)
+
+XMLS = Linux-PAM_MWG.xml $(shell ls $(srcdir)/pam_*.xml)
+DEP_XMLS = $(shell ls $(top_srcdir)/doc/man/pam_*.xml)
+
+if ENABLE_REGENERATE_MAN
+MAINTAINERCLEANFILES = Linux-PAM_MWG.txt Linux-PAM_MWG.pdf html/*.html
+
+all: Linux-PAM_MWG.txt html/Linux-PAM_MWG.html Linux-PAM_MWG.pdf
+
+Linux-PAM_MWG.pdf: $(XMLS) $(DEP_XMLS)
+if ENABLE_GENERATE_PDF
+	$(XMLLINT) --nonet --xinclude --postvalid --noent --noout $<
+	$(XSLTPROC) --stringparam generate.toc "book toc" \
+	  --stringparam section.autolabel 1 \
+	  --stringparam section.label.includes.component.label 1 \
+	  --stringparam toc.max.depth 3 --xinclude --nonet \
+	http://docbook.sourceforge.net/release/xsl/current/fo/docbook.xsl $< > Linux-PAM_MWG.fo
+	$(FO2PDF) Linux-PAM_MWG.fo $@
+else
+	echo "No fo2pdf processor installed, skip PDF generation"
+endif
+
+Linux-PAM_MWG.txt: $(XMLS) $(DEP_XMLS)
+	$(XMLLINT) --nonet --xinclude --postvalid --noent --noout $<
+	$(XSLTPROC) --stringparam generate.toc "book toc" \
+	  --stringparam section.autolabel 1 \
+	  --stringparam section.label.includes.component.label 1 \
+	  --stringparam toc.max.depth 3 --xinclude --nonet \
+	  http://docbook.sourceforge.net/release/xsl/current/html/docbook.xsl $< | $(BROWSER) > $@
+
+html/Linux-PAM_MWG.html: $(XMLS) $(DEP_XMLS)
+	@test -d html || mkdir -p html
+	$(XMLLINT) --nonet --xinclude --postvalid --noent --noout $<
+	$(XSLTPROC) --stringparam base.dir html/ \
+	  --stringparam root.filename Linux-PAM_MWG \
+	  --stringparam use.id.as.filename 1 \
+	  --stringparam chunk.first.sections 1 \
+	  --stringparam section.autolabel 1 \
+	  --stringparam section.label.includes.component.label 1 \
+	  --stringparam toc.max.depth 3 --xinclude --nonet \
+	  --stringparam chunker.output.encoding UTF-8 \
+	  http://docbook.sourceforge.net/release/xsl/current/html/chunk.xsl $<
+
+distclean-local:
+	-rm -rf html Linux-PAM_MWG.txt Linux-PAM_MWG.pdf
+
+endif
+
+install-data-local:
+	$(mkinstalldirs) $(DESTDIR)$(docdir)
+	$(mkinstalldirs) $(DESTDIR)$(pdfdir)
+	$(mkinstalldirs) $(DESTDIR)$(htmldir)
+	if test -f html/Linux-PAM_MWG.html; then \
+	    $(install_sh_DATA) html/Linux-PAM_MWG.html html/mwg-*.html \
+		$(DESTDIR)$(htmldir)/; \
+	elif test -f $(srcdir)/html/Linux-PAM_MWG.html; then \
+	    $(install_sh_DATA) $(srcdir)/html/Linux-PAM_MWG.html \
+		$(srcdir)/html/mwg-*.html \
+		$(DESTDIR)$(htmldir)/; \
+	fi
+	if test -f Linux-PAM_MWG.txt; then \
+	    $(install_sh_DATA) Linux-PAM_MWG.txt $(DESTDIR)$(docdir)/; \
+	elif test -f $(srcdir)/Linux-PAM_MWG.txt; then \
+	    $(install_sh_DATA) $(srcdir)/Linux-PAM_MWG.txt \
+		$(DESTDIR)$(docdir)/; \
+	fi
+	if test -f Linux-PAM_MWG.pdf; then \
+	    $(install_sh_DATA) Linux-PAM_MWG.pdf $(DESTDIR)$(pdfdir)/; \
+	elif test -f $(srcdir)/Linux-PAM_MWG.pdf; then \
+	    $(install_sh_DATA) $(srcdir)/Linux-PAM_MWG.pdf \
+		$(DESTDIR)$(pdfdir)/; \
+	fi
+
+uninstall-local:
+	-rm $(DESTDIR)$(htmldir)/Linux-PAM_MWG.html
+	-rm $(DESTDIR)$(htmldir)/mwg-*.html
+	-rm $(DESTDIR)$(docdir)/Linux-PAM_MWG.txt
+	-rm $(DESTDIR)$(pdfdir)/Linux-PAM_MWG.pdf
+
+releasedocs: all
+	$(mkinstalldirs) $(top_builddir)/Linux-PAM-$(VERSION)/doc/mwg/html
+	if test -f html/Linux-PAM_MWG.html; then \
+	    cp -ap html/Linux-PAM_MWG.html html/mwg-*.html \
+		$(top_builddir)/Linux-PAM-$(VERSION)/doc/mwg/html/; \
+	elif test -f $(srcdir)/html/Linux-PAM_MWG.html; then \
+	    cp -ap $(srcdir)/html/Linux-PAM_MWG.html \
+		$(srcdir)/html/mwg-*.html \
+		$(top_builddir)/Linux-PAM-$(VERSION)/doc/mwg/html/; \
+	else exit 1; \
+	fi
+	if test -f Linux-PAM_MWG.txt; then \
+	    cp -p Linux-PAM_MWG.txt \
+		$(top_builddir)/Linux-PAM-$(VERSION)/doc/mwg/; \
+	elif test -f $(srcdir)/Linux-PAM_MWG.txt; then \
+	    cp -p $(srcdir)/Linux-PAM_MWG.txt \
+		$(top_builddir)/Linux-PAM-$(VERSION)/doc/mwg/; \
+	else exit 1; \
+	fi
+	if test -f Linux-PAM_MWG.pdf; then \
+	    cp -p Linux-PAM_MWG.pdf \
+		$(top_builddir)/Linux-PAM-$(VERSION)/doc/mwg/; \
+	elif test -f $(srcdir)/Linux-PAM_MWG.pdf; then \
+	    cp -p $(srcdir)/Linux-PAM_MWG.pdf \
+		$(top_builddir)/Linux-PAM-$(VERSION)/doc/mwg/; \
+	else exit 1; \
+	fi
diff --git a/doc/mwg/Makefile.in b/doc/mwg/Makefile.in
new file mode 100644
index 0000000..45123b3
--- /dev/null
+++ b/doc/mwg/Makefile.in
@@ -0,0 +1,623 @@
+# Makefile.in generated by automake 1.16.3 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
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+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+#
+# Copyright (c) 2006 Thorsten Kukuk <kukuk@thkukuk.de>
+#
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+LIBPRELUDE_LIBS = @LIBPRELUDE_LIBS@
+LIBPRELUDE_PREFIX = @LIBPRELUDE_PREFIX@
+LIBPRELUDE_PTHREAD_CFLAGS = @LIBPRELUDE_PTHREAD_CFLAGS@
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+SED = @SED@
+SET_MAKE = @SET_MAKE@
+SHELL = @SHELL@
+STRINGPARAM_HMAC = @STRINGPARAM_HMAC@
+STRINGPARAM_VENDORDIR = @STRINGPARAM_VENDORDIR@
+STRIP = @STRIP@
+TIRPC_CFLAGS = @TIRPC_CFLAGS@
+TIRPC_LIBS = @TIRPC_LIBS@
+USE_NLS = @USE_NLS@
+VERSION = @VERSION@
+WARN_CFLAGS = @WARN_CFLAGS@
+XGETTEXT = @XGETTEXT@
+XGETTEXT_015 = @XGETTEXT_015@
+XGETTEXT_EXTRA_OPTIONS = @XGETTEXT_EXTRA_OPTIONS@
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+build_os = @build_os@
+build_vendor = @build_vendor@
+builddir = @builddir@
+datadir = @datadir@
+datarootdir = @datarootdir@
+docdir = @docdir@
+dvidir = @dvidir@
+exec_prefix = @exec_prefix@
+host = @host@
+host_alias = @host_alias@
+host_cpu = @host_cpu@
+host_os = @host_os@
+host_vendor = @host_vendor@
+htmldir = @htmldir@
+includedir = @includedir@
+infodir = @infodir@
+install_sh = @install_sh@
+libdir = @libdir@
+libexecdir = @libexecdir@
+localedir = @localedir@
+localstatedir = @localstatedir@
+mandir = @mandir@
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+pam_xauth_path = @pam_xauth_path@
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+
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+
+clean-libtool:
+	-rm -rf .libs _libs
+tags TAGS:
+
+ctags CTAGS:
+
+cscope cscopelist:
+
+
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile
+installdirs:
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+	-test -z "$(CLEANFILES)" || rm -f $(CLEANFILES)
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+	-test -z "$(MAINTAINERCLEANFILES)" || rm -f $(MAINTAINERCLEANFILES)
+@ENABLE_REGENERATE_MAN_FALSE@distclean-local:
+clean: clean-am
+
+clean-am: clean-generic clean-libtool mostlyclean-am
+
+distclean: distclean-am
+	-rm -f Makefile
+distclean-am: clean-am distclean-generic distclean-local
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am: install-data-local
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-generic mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am: uninstall-local
+
+.MAKE: install-am install-strip
+
+.PHONY: all all-am check check-am clean clean-generic clean-libtool \
+	cscopelist-am ctags-am distclean distclean-generic \
+	distclean-libtool distclean-local distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-data-local install-dvi install-dvi-am \
+	install-exec install-exec-am install-html install-html-am \
+	install-info install-info-am install-man install-pdf \
+	install-pdf-am install-ps install-ps-am install-strip \
+	installcheck installcheck-am installdirs maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-generic \
+	mostlyclean-libtool pdf pdf-am ps ps-am tags-am uninstall \
+	uninstall-am uninstall-local
+
+.PRECIOUS: Makefile
+
+
+@ENABLE_REGENERATE_MAN_TRUE@all: Linux-PAM_MWG.txt html/Linux-PAM_MWG.html Linux-PAM_MWG.pdf
+
+@ENABLE_REGENERATE_MAN_TRUE@Linux-PAM_MWG.pdf: $(XMLS) $(DEP_XMLS)
+@ENABLE_GENERATE_PDF_TRUE@@ENABLE_REGENERATE_MAN_TRUE@	$(XMLLINT) --nonet --xinclude --postvalid --noent --noout $<
+@ENABLE_GENERATE_PDF_TRUE@@ENABLE_REGENERATE_MAN_TRUE@	$(XSLTPROC) --stringparam generate.toc "book toc" \
+@ENABLE_GENERATE_PDF_TRUE@@ENABLE_REGENERATE_MAN_TRUE@	  --stringparam section.autolabel 1 \
+@ENABLE_GENERATE_PDF_TRUE@@ENABLE_REGENERATE_MAN_TRUE@	  --stringparam section.label.includes.component.label 1 \
+@ENABLE_GENERATE_PDF_TRUE@@ENABLE_REGENERATE_MAN_TRUE@	  --stringparam toc.max.depth 3 --xinclude --nonet \
+@ENABLE_GENERATE_PDF_TRUE@@ENABLE_REGENERATE_MAN_TRUE@	http://docbook.sourceforge.net/release/xsl/current/fo/docbook.xsl $< > Linux-PAM_MWG.fo
+@ENABLE_GENERATE_PDF_TRUE@@ENABLE_REGENERATE_MAN_TRUE@	$(FO2PDF) Linux-PAM_MWG.fo $@
+@ENABLE_GENERATE_PDF_FALSE@@ENABLE_REGENERATE_MAN_TRUE@	echo "No fo2pdf processor installed, skip PDF generation"
+
+@ENABLE_REGENERATE_MAN_TRUE@Linux-PAM_MWG.txt: $(XMLS) $(DEP_XMLS)
+@ENABLE_REGENERATE_MAN_TRUE@	$(XMLLINT) --nonet --xinclude --postvalid --noent --noout $<
+@ENABLE_REGENERATE_MAN_TRUE@	$(XSLTPROC) --stringparam generate.toc "book toc" \
+@ENABLE_REGENERATE_MAN_TRUE@	  --stringparam section.autolabel 1 \
+@ENABLE_REGENERATE_MAN_TRUE@	  --stringparam section.label.includes.component.label 1 \
+@ENABLE_REGENERATE_MAN_TRUE@	  --stringparam toc.max.depth 3 --xinclude --nonet \
+@ENABLE_REGENERATE_MAN_TRUE@	  http://docbook.sourceforge.net/release/xsl/current/html/docbook.xsl $< | $(BROWSER) > $@
+
+@ENABLE_REGENERATE_MAN_TRUE@html/Linux-PAM_MWG.html: $(XMLS) $(DEP_XMLS)
+@ENABLE_REGENERATE_MAN_TRUE@	@test -d html || mkdir -p html
+@ENABLE_REGENERATE_MAN_TRUE@	$(XMLLINT) --nonet --xinclude --postvalid --noent --noout $<
+@ENABLE_REGENERATE_MAN_TRUE@	$(XSLTPROC) --stringparam base.dir html/ \
+@ENABLE_REGENERATE_MAN_TRUE@	  --stringparam root.filename Linux-PAM_MWG \
+@ENABLE_REGENERATE_MAN_TRUE@	  --stringparam use.id.as.filename 1 \
+@ENABLE_REGENERATE_MAN_TRUE@	  --stringparam chunk.first.sections 1 \
+@ENABLE_REGENERATE_MAN_TRUE@	  --stringparam section.autolabel 1 \
+@ENABLE_REGENERATE_MAN_TRUE@	  --stringparam section.label.includes.component.label 1 \
+@ENABLE_REGENERATE_MAN_TRUE@	  --stringparam toc.max.depth 3 --xinclude --nonet \
+@ENABLE_REGENERATE_MAN_TRUE@	  --stringparam chunker.output.encoding UTF-8 \
+@ENABLE_REGENERATE_MAN_TRUE@	  http://docbook.sourceforge.net/release/xsl/current/html/chunk.xsl $<
+
+@ENABLE_REGENERATE_MAN_TRUE@distclean-local:
+@ENABLE_REGENERATE_MAN_TRUE@	-rm -rf html Linux-PAM_MWG.txt Linux-PAM_MWG.pdf
+
+install-data-local:
+	$(mkinstalldirs) $(DESTDIR)$(docdir)
+	$(mkinstalldirs) $(DESTDIR)$(pdfdir)
+	$(mkinstalldirs) $(DESTDIR)$(htmldir)
+	if test -f html/Linux-PAM_MWG.html; then \
+	    $(install_sh_DATA) html/Linux-PAM_MWG.html html/mwg-*.html \
+		$(DESTDIR)$(htmldir)/; \
+	elif test -f $(srcdir)/html/Linux-PAM_MWG.html; then \
+	    $(install_sh_DATA) $(srcdir)/html/Linux-PAM_MWG.html \
+		$(srcdir)/html/mwg-*.html \
+		$(DESTDIR)$(htmldir)/; \
+	fi
+	if test -f Linux-PAM_MWG.txt; then \
+	    $(install_sh_DATA) Linux-PAM_MWG.txt $(DESTDIR)$(docdir)/; \
+	elif test -f $(srcdir)/Linux-PAM_MWG.txt; then \
+	    $(install_sh_DATA) $(srcdir)/Linux-PAM_MWG.txt \
+		$(DESTDIR)$(docdir)/; \
+	fi
+	if test -f Linux-PAM_MWG.pdf; then \
+	    $(install_sh_DATA) Linux-PAM_MWG.pdf $(DESTDIR)$(pdfdir)/; \
+	elif test -f $(srcdir)/Linux-PAM_MWG.pdf; then \
+	    $(install_sh_DATA) $(srcdir)/Linux-PAM_MWG.pdf \
+		$(DESTDIR)$(pdfdir)/; \
+	fi
+
+uninstall-local:
+	-rm $(DESTDIR)$(htmldir)/Linux-PAM_MWG.html
+	-rm $(DESTDIR)$(htmldir)/mwg-*.html
+	-rm $(DESTDIR)$(docdir)/Linux-PAM_MWG.txt
+	-rm $(DESTDIR)$(pdfdir)/Linux-PAM_MWG.pdf
+
+releasedocs: all
+	$(mkinstalldirs) $(top_builddir)/Linux-PAM-$(VERSION)/doc/mwg/html
+	if test -f html/Linux-PAM_MWG.html; then \
+	    cp -ap html/Linux-PAM_MWG.html html/mwg-*.html \
+		$(top_builddir)/Linux-PAM-$(VERSION)/doc/mwg/html/; \
+	elif test -f $(srcdir)/html/Linux-PAM_MWG.html; then \
+	    cp -ap $(srcdir)/html/Linux-PAM_MWG.html \
+		$(srcdir)/html/mwg-*.html \
+		$(top_builddir)/Linux-PAM-$(VERSION)/doc/mwg/html/; \
+	else exit 1; \
+	fi
+	if test -f Linux-PAM_MWG.txt; then \
+	    cp -p Linux-PAM_MWG.txt \
+		$(top_builddir)/Linux-PAM-$(VERSION)/doc/mwg/; \
+	elif test -f $(srcdir)/Linux-PAM_MWG.txt; then \
+	    cp -p $(srcdir)/Linux-PAM_MWG.txt \
+		$(top_builddir)/Linux-PAM-$(VERSION)/doc/mwg/; \
+	else exit 1; \
+	fi
+	if test -f Linux-PAM_MWG.pdf; then \
+	    cp -p Linux-PAM_MWG.pdf \
+		$(top_builddir)/Linux-PAM-$(VERSION)/doc/mwg/; \
+	elif test -f $(srcdir)/Linux-PAM_MWG.pdf; then \
+	    cp -p $(srcdir)/Linux-PAM_MWG.pdf \
+		$(top_builddir)/Linux-PAM-$(VERSION)/doc/mwg/; \
+	else exit 1; \
+	fi
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/doc/mwg/pam_conv.xml b/doc/mwg/pam_conv.xml
new file mode 100644
index 0000000..a2b470a
--- /dev/null
+++ b/doc/mwg/pam_conv.xml
@@ -0,0 +1,35 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
+        "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
+<section id='mwg-pam_conv'>
+  <title>The conversation function</title>
+  <funcsynopsis>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_conv.3.xml" xpointer='xpointer(//funcsynopsis[@id = "pam_conv-synopsis"]/*)'/>
+  </funcsynopsis>
+  <programlisting>
+struct pam_message {
+    int msg_style;
+    const char *msg;
+};
+
+struct pam_response {
+    char *resp;
+    int resp_retcode;
+};
+
+struct pam_conv {
+    int (*conv)(int num_msg, const struct pam_message **msg,
+                struct pam_response **resp, void *appdata_ptr);
+    void *appdata_ptr;
+};
+  </programlisting>
+  <section id='mwg-pam_conv-description'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_conv.3.xml" xpointer='xpointer(//refsect1[@id = "pam_conv-description"]/*)'/>
+  </section>
+  <section id='mwg-pam_conv-return_values'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_conv.3.xml" xpointer='xpointer(//refsect1[@id = "pam_conv-return_values"]/*)'/>
+  </section>
+</section>
diff --git a/doc/mwg/pam_fail_delay.xml b/doc/mwg/pam_fail_delay.xml
new file mode 100644
index 0000000..589e114
--- /dev/null
+++ b/doc/mwg/pam_fail_delay.xml
@@ -0,0 +1,18 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
+        "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
+<section id='adg-pam_fail_delay'>
+  <title>Request a delay on failure</title>
+  <funcsynopsis>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_fail_delay.3.xml" xpointer='xpointer(//funcsynopsis[@id = "pam_fail_delay-synopsis"]/*)'/>
+  </funcsynopsis>
+  <section id='adg-pam_fail_delay-description'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_fail_delay.3.xml" xpointer='xpointer(//refsect1[@id = "pam_fail_delay-description"]/*)'/>
+  </section>
+  <section id='adg-pam_fail_delay-return_values'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_fail_delay.3.xml" xpointer='xpointer(//refsect1[@id = "pam_fail_delay-return_values"]/*)'/>
+  </section>
+</section>
diff --git a/doc/mwg/pam_get_data.xml b/doc/mwg/pam_get_data.xml
new file mode 100644
index 0000000..b1afdb3
--- /dev/null
+++ b/doc/mwg/pam_get_data.xml
@@ -0,0 +1,18 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
+        "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
+<section id='mwg-pam_get_data'>
+  <title>Get module internal data</title>
+  <funcsynopsis>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_get_data.3.xml" xpointer='xpointer(//funcsynopsis[@id = "pam_get_data-synopsis"]/*)'/>
+  </funcsynopsis>
+  <section id='mwg-pam_get_data-description'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_get_data.3.xml" xpointer='xpointer(//refsect1[@id = "pam_get_data-description"]/*)'/>
+  </section>
+  <section id='mwg-pam_get_data-return_values'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_get_data.3.xml" xpointer='xpointer(//refsect1[@id = "pam_get_data-return_values"]/*)'/>
+  </section>
+</section>
diff --git a/doc/mwg/pam_get_item.xml b/doc/mwg/pam_get_item.xml
new file mode 100644
index 0000000..370a10a
--- /dev/null
+++ b/doc/mwg/pam_get_item.xml
@@ -0,0 +1,18 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
+        "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
+<section id='mwg-pam_get_item'>
+  <title>Getting PAM items</title>
+  <funcsynopsis>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_get_item.3.xml" xpointer='xpointer(//funcsynopsis[@id = "pam_get_item-synopsis"]/*)'/>
+  </funcsynopsis>
+  <section id='mwg-pam_get_item-description'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_get_item.3.xml" xpointer='xpointer(//refsect1[@id = "pam_get_item-description"]/*)'/>
+  </section>
+  <section id='mwg-pam_get_item-return_values'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_get_item.3.xml" xpointer='xpointer(//refsect1[@id = "pam_get_item-return_values"]/*)'/>
+  </section>
+</section>
diff --git a/doc/mwg/pam_get_user.xml b/doc/mwg/pam_get_user.xml
new file mode 100644
index 0000000..1cb7fdf
--- /dev/null
+++ b/doc/mwg/pam_get_user.xml
@@ -0,0 +1,18 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
+        "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
+<section id='mwg-pam_get_user'>
+  <title>Get user name</title>
+  <funcsynopsis>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_get_user.3.xml" xpointer='xpointer(//funcsynopsis[@id = "pam_get_user-synopsis"]/*)'/>
+  </funcsynopsis>
+  <section id='mwg-pam_get_user-description'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_get_user.3.xml" xpointer='xpointer(//refsect1[@id = "pam_get_user-description"]/*)'/>
+  </section>
+  <section id='mwg-pam_get_user-return_values'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_get_user.3.xml" xpointer='xpointer(//refsect1[@id = "pam_get_user-return_values"]/*)'/>
+  </section>
+</section>
diff --git a/doc/mwg/pam_getenv.xml b/doc/mwg/pam_getenv.xml
new file mode 100644
index 0000000..61d69c3
--- /dev/null
+++ b/doc/mwg/pam_getenv.xml
@@ -0,0 +1,18 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
+        "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
+<section id='adg-pam_getenv'>
+  <title>Get a PAM environment variable</title>
+  <funcsynopsis>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_getenv.3.xml" xpointer='xpointer(//funcsynopsis[@id = "pam_getenv-synopsis"]/*)'/>
+  </funcsynopsis>
+  <section id='adg-pam_getenv-description'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_getenv.3.xml" xpointer='xpointer(//refsect1[@id = "pam_getenv-description"]/*)'/>
+  </section>
+  <section id='adg-pam_getenv-return_values'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_getenv.3.xml" xpointer='xpointer(//refsect1[@id = "pam_getenv-return_values"]/*)'/>
+  </section>
+</section>
diff --git a/doc/mwg/pam_getenvlist.xml b/doc/mwg/pam_getenvlist.xml
new file mode 100644
index 0000000..d3c2fcd
--- /dev/null
+++ b/doc/mwg/pam_getenvlist.xml
@@ -0,0 +1,18 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
+        "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
+<section id='adg-pam_getenvlist'>
+  <title>Getting the PAM environment</title>
+  <funcsynopsis>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_getenvlist.3.xml" xpointer='xpointer(//funcsynopsis[@id = "pam_getenvlist-synopsis"]/*)'/>
+  </funcsynopsis>
+  <section id='adg-pam_getenvlist-description'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_getenvlist.3.xml" xpointer='xpointer(//refsect1[@id = "pam_getenvlist-description"]/*)'/>
+  </section>
+  <section id='adg-pam_getenvlist-return_values'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_getenvlist.3.xml" xpointer='xpointer(//refsect1[@id = "pam_getenvlist-return_values"]/*)'/>
+  </section>
+</section>
diff --git a/doc/mwg/pam_putenv.xml b/doc/mwg/pam_putenv.xml
new file mode 100644
index 0000000..e55f1a4
--- /dev/null
+++ b/doc/mwg/pam_putenv.xml
@@ -0,0 +1,18 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
+        "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
+<section id='adg-pam_putenv'>
+  <title>Set or change PAM environment variable</title>
+  <funcsynopsis>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_putenv.3.xml" xpointer='xpointer(//funcsynopsis[@id = "pam_putenv-synopsis"]/*)'/>
+  </funcsynopsis>
+  <section id='adg-pam_putenv-description'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_putenv.3.xml" xpointer='xpointer(//refsect1[@id = "pam_putenv-description"]/*)'/>
+  </section>
+  <section id='adg-pam_putenv-return_values'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_putenv.3.xml" xpointer='xpointer(//refsect1[@id = "pam_putenv-return_values"]/*)'/>
+  </section>
+</section>
diff --git a/doc/mwg/pam_set_data.xml b/doc/mwg/pam_set_data.xml
new file mode 100644
index 0000000..18b2711
--- /dev/null
+++ b/doc/mwg/pam_set_data.xml
@@ -0,0 +1,18 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
+        "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
+<section id='mwg-pam_set_data'>
+  <title>Set module internal data</title>
+  <funcsynopsis>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_set_data.3.xml" xpointer='xpointer(//funcsynopsis[@id = "pam_set_data-synopsis"]/*)'/>
+  </funcsynopsis>
+  <section id='mwg-pam_set_data-description'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_set_data.3.xml" xpointer='xpointer(//refsect1[@id = "pam_set_data-description"]/*)'/>
+  </section>
+  <section id='mwg-pam_set_data-return_values'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_set_data.3.xml" xpointer='xpointer(//refsect1[@id = "pam_set_data-return_values"]/*)'/>
+  </section>
+</section>
diff --git a/doc/mwg/pam_set_item.xml b/doc/mwg/pam_set_item.xml
new file mode 100644
index 0000000..7d19925
--- /dev/null
+++ b/doc/mwg/pam_set_item.xml
@@ -0,0 +1,18 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
+        "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
+<section id='mwg-pam_set_item'>
+  <title>Setting PAM items</title>
+  <funcsynopsis>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_set_item.3.xml" xpointer='xpointer(//funcsynopsis[@id = "pam_set_item-synopsis"]/*)'/>
+  </funcsynopsis>
+  <section id='mwg-pam_set_item-description'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_set_item.3.xml" xpointer='xpointer(//refsect1[@id = "pam_set_item-description"]/*)'/>
+  </section>
+  <section id='mwg-pam_set_item-return_values'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_set_item.3.xml" xpointer='xpointer(//refsect1[@id = "pam_set_item-return_values"]/*)'/>
+  </section>
+</section>
diff --git a/doc/mwg/pam_sm_acct_mgmt.xml b/doc/mwg/pam_sm_acct_mgmt.xml
new file mode 100644
index 0000000..10b3c9e
--- /dev/null
+++ b/doc/mwg/pam_sm_acct_mgmt.xml
@@ -0,0 +1,18 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
+        "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
+<section id='mwg-pam_sm_acct_mgmt'>
+  <title>Service function for account management</title>
+  <funcsynopsis>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_sm_acct_mgmt.3.xml" xpointer='xpointer(//funcsynopsis[@id = "pam_sm_acct_mgmt-synopsis"]/*)'/>
+  </funcsynopsis>
+  <section id='mwg-pam_sm_acct_mgmt-description'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_sm_acct_mgmt.3.xml" xpointer='xpointer(//refsect1[@id = "pam_sm_acct_mgmt-description"]/*)'/>
+  </section>
+  <section id='mwg-pam_sm_acct_mgmt-return_values'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_sm_acct_mgmt.3.xml" xpointer='xpointer(//refsect1[@id = "pam_sm_acct_mgmt-return_values"]/*)'/>
+  </section>
+</section>
diff --git a/doc/mwg/pam_sm_authenticate.xml b/doc/mwg/pam_sm_authenticate.xml
new file mode 100644
index 0000000..54c79af
--- /dev/null
+++ b/doc/mwg/pam_sm_authenticate.xml
@@ -0,0 +1,18 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
+        "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
+<section id='mwg-pam_sm_authenticate'>
+  <title>Service function for user authentication</title>
+  <funcsynopsis>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_sm_authenticate.3.xml" xpointer='xpointer(//funcsynopsis[@id = "pam_sm_authenticate-synopsis"]/*)'/>
+  </funcsynopsis>
+  <section id='mwg-pam_sm_authenticate-description'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_sm_authenticate.3.xml" xpointer='xpointer(//refsect1[@id = "pam_sm_authenticate-description"]/*)'/>
+  </section>
+  <section id='mwg-pam_sm_authenticate-return_values'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_sm_authenticate.3.xml" xpointer='xpointer(//refsect1[@id = "pam_sm_authenticate-return_values"]/*)'/>
+  </section>
+</section>
diff --git a/doc/mwg/pam_sm_chauthtok.xml b/doc/mwg/pam_sm_chauthtok.xml
new file mode 100644
index 0000000..a136431
--- /dev/null
+++ b/doc/mwg/pam_sm_chauthtok.xml
@@ -0,0 +1,18 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
+        "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
+<section id='mwg-pam_sm_chauthtok'>
+  <title>Service function to alter authentication token</title>
+  <funcsynopsis>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_sm_chauthtok.3.xml" xpointer='xpointer(//funcsynopsis[@id = "pam_sm_chauthtok-synopsis"]/*)'/>
+  </funcsynopsis>
+  <section id='mwg-pam_sm_chauthtok-description'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_sm_chauthtok.3.xml" xpointer='xpointer(//refsect1[@id = "pam_sm_chauthtok-description"]/*)'/>
+  </section>
+  <section id='mwg-pam_sm_chauthtok-return_values'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_sm_chauthtok.3.xml" xpointer='xpointer(//refsect1[@id = "pam_sm_chauthtok-return_values"]/*)'/>
+  </section>
+</section>
diff --git a/doc/mwg/pam_sm_close_session.xml b/doc/mwg/pam_sm_close_session.xml
new file mode 100644
index 0000000..9346c50
--- /dev/null
+++ b/doc/mwg/pam_sm_close_session.xml
@@ -0,0 +1,18 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
+        "http://www.oasis-close.org/docbook/xml/4.4/docbookx.dtd">
+<section id='mwg-pam_sm_close_session'>
+  <title>Service function to terminate session management</title>
+  <funcsynopsis>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_sm_close_session.3.xml" xpointer='xpointer(//funcsynopsis[@id = "pam_sm_close_session-synopsis"]/*)'/>
+  </funcsynopsis>
+  <section id='mwg-pam_sm_close_session-description'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_sm_close_session.3.xml" xpointer='xpointer(//refsect1[@id = "pam_sm_close_session-description"]/*)'/>
+  </section>
+  <section id='mwg-pam_sm_close_session-return_values'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_sm_close_session.3.xml" xpointer='xpointer(//refsect1[@id = "pam_sm_close_session-return_values"]/*)'/>
+  </section>
+</section>
diff --git a/doc/mwg/pam_sm_open_session.xml b/doc/mwg/pam_sm_open_session.xml
new file mode 100644
index 0000000..b8e3fa9
--- /dev/null
+++ b/doc/mwg/pam_sm_open_session.xml
@@ -0,0 +1,18 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
+        "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
+<section id='mwg-pam_sm_open_session'>
+  <title>Service function to start session management</title>
+  <funcsynopsis>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_sm_open_session.3.xml" xpointer='xpointer(//funcsynopsis[@id = "pam_sm_open_session-synopsis"]/*)'/>
+  </funcsynopsis>
+  <section id='mwg-pam_sm_open_session-description'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_sm_open_session.3.xml" xpointer='xpointer(//refsect1[@id = "pam_sm_open_session-description"]/*)'/>
+  </section>
+  <section id='mwg-pam_sm_open_session-return_values'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_sm_open_session.3.xml" xpointer='xpointer(//refsect1[@id = "pam_sm_open_session-return_values"]/*)'/>
+  </section>
+</section>
diff --git a/doc/mwg/pam_sm_setcred.xml b/doc/mwg/pam_sm_setcred.xml
new file mode 100644
index 0000000..eee8e1d
--- /dev/null
+++ b/doc/mwg/pam_sm_setcred.xml
@@ -0,0 +1,18 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
+        "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
+<section id='mwg-pam_sm_setcred'>
+  <title>Service function to alter credentials</title>
+  <funcsynopsis>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_sm_setcred.3.xml" xpointer='xpointer(//funcsynopsis[@id = "pam_sm_setcred-synopsis"]/*)'/>
+  </funcsynopsis>
+  <section id='mwg-pam_sm_setcred-description'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_sm_setcred.3.xml" xpointer='xpointer(//refsect1[@id = "pam_sm_setcred-description"]/*)'/>
+  </section>
+  <section id='mwg-pam_sm_setcred-return_values'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_sm_setcred.3.xml" xpointer='xpointer(//refsect1[@id = "pam_sm_setcred-return_values"]/*)'/>
+  </section>
+</section>
diff --git a/doc/mwg/pam_strerror.xml b/doc/mwg/pam_strerror.xml
new file mode 100644
index 0000000..35b08a2
--- /dev/null
+++ b/doc/mwg/pam_strerror.xml
@@ -0,0 +1,18 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
+        "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd">
+<section id='adg-pam_strerror'>
+  <title>Strings describing PAM error codes</title>
+  <funcsynopsis>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_strerror.3.xml" xpointer='xpointer(//funcsynopsis[@id = "pam_strerror-synopsis"]/*)'/>
+  </funcsynopsis>
+  <section id='adg-pam_strerror-description'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_strerror.3.xml" xpointer='xpointer(//refsect1[@id = "pam_strerror-description"]/*)'/>
+  </section>
+  <section id='adg-pam_strerror-return_values'>
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+     href="../man/pam_strerror.3.xml" xpointer='xpointer(//refsect1[@id = "pam_strerror-return_values"]/*)'/>
+  </section>
+</section>