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<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Chapter 21. Winbind: Use of Domain Accounts</title><link rel="stylesheet" href="samba.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.60.1"><link rel="home" href="index.html" title="SAMBA Project Documentation"><link rel="up" href="optional.html" title="Part III. Advanced Configuration"><link rel="previous" href="VFS.html" title="Chapter 20. Stackable VFS modules"><link rel="next" href="AdvancedNetworkManagement.html" title="Chapter 22. Advanced Network Management"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 21. Winbind: Use of Domain Accounts</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="VFS.html">Prev</a> </td><th width="60%" align="center">Part III. Advanced Configuration</th><td width="20%" align="right"> <a accesskey="n" href="AdvancedNetworkManagement.html">Next</a></td></tr></table><hr></div><div class="chapter" lang="en"><div class="titlepage"><div><div><h2 class="title"><a name="winbind"></a>Chapter 21. Winbind: Use of Domain Accounts</h2></div><div><div class="author"><h3 class="author"><span class="firstname">Tim</span> <span class="surname">Potter</span></h3><div class="affiliation"><span class="orgname">Samba Team<br></span><div class="address"><p><tt class="email"><<a href="mailto:tpot@linuxcare.com.au">tpot@linuxcare.com.au</a>></tt></p></div></div></div></div><div><div class="author"><h3 class="author"><span class="firstname">Andrew</span> <span class="surname">Tridgell</span></h3><div class="affiliation"><span class="orgname">Samba Team<br></span><div class="address"><p><tt class="email"><<a href="mailto:tridge@samba.org">tridge@samba.org</a>></tt></p></div></div></div></div><div><div class="author"><h3 class="author"><span class="firstname">Naag</span> <span class="surname">Mummaneni</span></h3><span class="contrib">Notes for Solaris</span><div class="affiliation"><div class="address"><p><tt class="email"><<a href="mailto:getnag@rediffmail.com">getnag@rediffmail.com</a>></tt></p></div></div></div></div><div><div class="author"><h3 class="author"><span class="firstname">John</span> <span class="surname">Trostel</span></h3><div class="affiliation"><div class="address"><p><tt class="email"><<a href="mailto:jtrostel@snapserver.com">jtrostel@snapserver.com</a>></tt></p></div><span class="orgname">SNAP<br></span></div></div></div><div><div class="author"><h3 class="author"><span class="firstname">Jelmer</span> <span class="othername">R.</span> <span class="surname">Vernooij</span></h3><div class="affiliation"><span class="orgname">The Samba Team<br></span><div class="address"><p><tt class="email"><<a href="mailto:jelmer@samba.org">jelmer@samba.org</a>></tt></p></div></div></div></div><div><div class="author"><h3 class="author"><span class="firstname">John</span> <span class="othername">H.</span> <span class="surname">Terpstra</span></h3><div class="affiliation"><span class="orgname">Samba Team<br></span><div class="address"><p><tt class="email"><<a href="mailto:jht@samba.org">jht@samba.org</a>></tt></p></div></div></div></div><div><p class="pubdate">27 June 2002</p></div></div><div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><a href="winbind.html#id2949352">Features and Benefits</a></dt><dt><a href="winbind.html#id2949476">Introduction</a></dt><dt><a href="winbind.html#id2949558">What Winbind Provides</a></dt><dd><dl><dt><a href="winbind.html#id2949633">Target Uses</a></dt></dl></dd><dt><a href="winbind.html#id2949664">How Winbind Works</a></dt><dd><dl><dt><a href="winbind.html#id2949693">Microsoft Remote Procedure Calls</a></dt><dt><a href="winbind.html#id2949726">Microsoft Active Directory Services</a></dt><dt><a href="winbind.html#id2949752">Name Service Switch</a></dt><dt><a href="winbind.html#id2949887">Pluggable Authentication Modules</a></dt><dt><a href="winbind.html#id2949965">User and Group ID Allocation</a></dt><dt><a href="winbind.html#id2949998">Result Caching</a></dt></dl></dd><dt><a href="winbind.html#id2950035">Installation and Configuration</a></dt><dd><dl><dt><a href="winbind.html#id2950042">Introduction</a></dt><dt><a href="winbind.html#id2950108">Requirements</a></dt><dt><a href="winbind.html#id2950191">Testing Things Out</a></dt></dl></dd><dt><a href="winbind.html#id2951948">Conclusion</a></dt><dt><a href="winbind.html#id2951967">Common Errors</a></dt><dd><dl><dt><a href="winbind.html#id2952021">NSCD Problem Warning</a></dt><dt><a href="winbind.html#id2952067">Winbind Is Not Resolving Users and Groups</a></dt></dl></dd></dl></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2949352"></a>Features and Benefits</h2></div></div><div></div></div><p>
Integration of UNIX and Microsoft Windows NT through a unified logon has
been considered a “<span class="quote">holy grail</span>” in heterogeneous computing environments for
a long time.
</p><p>
There is one other facility without which UNIX and Microsoft Windows network
interoperability would suffer greatly. It is imperative that there be a
mechanism for sharing files across UNIX systems and to be able to assign
domain user and group ownerships with integrity.
</p><p>
<span class="emphasis"><em>winbind</em></span> is a component of the Samba suite of programs that
solves the unified logon problem. Winbind uses a UNIX implementation of Microsoft
RPC calls, Pluggable Authentication Modules, and the Name Service Switch to
allow Windows NT domain users to appear and operate as UNIX users on a UNIX
machine. This chapter describes the Winbind system, explaining the functionality
it provides, how it is configured, and how it works internally.
</p><p>
Winbind provides three separate functions:
</p><div class="itemizedlist"><ul type="disc"><li><p>
Authentication of user credentials (via PAM).
</p></li><li><p>
Identity resolution (via NSS).
</p></li><li><p>
Winbind maintains a database called winbind_idmap.tdb in which it stores
mappings between UNIX UIDs / GIDs and NT SIDs. This mapping is used only
for users and groups that do not have a local UID/GID. It stored the UID/GID
allocated from the idmap uid/gid range that it has mapped to the NT SID.
If <i class="parameter"><tt>idmap backend</tt></i> has been specified as ldapsam:url
then instead of using a local mapping Winbind will obtain this information
from the LDAP database.
</p></li></ul></div><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3><p>
If <b class="command">winbindd</b> is not running, smbd (which calls <b class="command">winbindd</b>) will fall back to
using purely local information from <tt class="filename">/etc/passwd</tt> and <tt class="filename">/etc/group</tt> and no dynamic
mapping will be used.
</p></div></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2949476"></a>Introduction</h2></div></div><div></div></div><p>It is well known that UNIX and Microsoft Windows NT have
different models for representing user and group information and
use different technologies for implementing them. This fact has
made it difficult to integrate the two systems in a satisfactory
manner.</p><p>One common solution in use today has been to create
identically named user accounts on both the UNIX and Windows systems
and use the Samba suite of programs to provide file and print services
between the two. This solution is far from perfect, however, as
adding and deleting users on both sets of machines becomes a chore
and two sets of passwords are required both of which
can lead to synchronization problems between the UNIX and Windows
systems and confusion for users.</p><p>We divide the unified logon problem for UNIX machines into
three smaller problems:</p><div class="itemizedlist"><ul type="disc"><li><p>Obtaining Windows NT user and group information.
</p></li><li><p>Authenticating Windows NT users.
</p></li><li><p>Password changing for Windows NT users.
</p></li></ul></div><p>Ideally, a prospective solution to the unified logon problem
would satisfy all the above components without duplication of
information on the UNIX machines and without creating additional
tasks for the system administrator when maintaining users and
groups on either system. The Winbind system provides a simple
and elegant solution to all three components of the unified logon
problem.</p></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2949558"></a>What Winbind Provides</h2></div></div><div></div></div><p>Winbind unifies UNIX and Windows NT account management by
allowing a UNIX box to become a full member of an NT domain. Once
this is done the UNIX box will see NT users and groups as if
they were “<span class="quote">native</span>” UNIX users and groups, allowing the NT domain
to be used in much the same manner that NIS+ is used within
UNIX-only environments.</p><p>The end result is that whenever any
program on the UNIX machine asks the operating system to lookup
a user or group name, the query will be resolved by asking the
NT Domain Controller for the specified domain to do the lookup.
Because Winbind hooks into the operating system at a low level
(via the NSS name resolution modules in the C library), this
redirection to the NT Domain Controller is completely
transparent.</p><p>Users on the UNIX machine can then use NT user and group
names as they would “<span class="quote">native</span>” UNIX names. They can chown files
so they are owned by NT domain users or even login to the
UNIX machine and run a UNIX X-Window session as a domain user.</p><p>The only obvious indication that Winbind is being used is
that user and group names take the form <tt class="constant">DOMAIN\user</tt> and
<tt class="constant">DOMAIN\group</tt>. This is necessary as it allows Winbind to determine
that redirection to a Domain Controller is wanted for a particular
lookup and which trusted domain is being referenced.</p><p>Additionally, Winbind provides an authentication service
that hooks into the Pluggable Authentication Modules (PAM) system
to provide authentication via an NT domain to any PAM-enabled
applications. This capability solves the problem of synchronizing
passwords between systems since all passwords are stored in a single
location (on the Domain Controller).</p><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2949633"></a>Target Uses</h3></div></div><div></div></div><p>Winbind is targeted at organizations that have an
existing NT-based domain infrastructure into which they wish
to put UNIX workstations or servers. Winbind will allow these
organizations to deploy UNIX workstations without having to
maintain a separate account infrastructure. This greatly
simplifies the administrative overhead of deploying UNIX
workstations into an NT-based organization.</p><p>Another interesting way in which we expect Winbind to
be used is as a central part of UNIX-based appliances. Appliances
that provide file and print services to Microsoft-based networks
will be able to use Winbind to provide seamless integration of
the appliance into the domain.</p></div></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2949664"></a>How Winbind Works</h2></div></div><div></div></div><p>The Winbind system is designed around a client/server
architecture. A long running <b class="command">winbindd</b> daemon
listens on a UNIX domain socket waiting for requests
to arrive. These requests are generated by the NSS and PAM
clients and is processed sequentially.</p><p>The technologies used to implement Winbind are described
in detail below.</p><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2949693"></a>Microsoft Remote Procedure Calls</h3></div></div><div></div></div><p>Over the last few years, efforts have been underway
by various Samba Team members to decode various aspects of
the Microsoft Remote Procedure Call (MSRPC) system. This
system is used for most network-related operations between
Windows NT machines including remote management, user authentication
and print spooling. Although initially this work was done
to aid the implementation of Primary Domain Controller (PDC)
functionality in Samba, it has also yielded a body of code that
can be used for other purposes.</p><p>Winbind uses various MSRPC calls to enumerate domain users
and groups and to obtain detailed information about individual
users or groups. Other MSRPC calls can be used to authenticate
NT domain users and to change user passwords. By directly querying
a Windows PDC for user and group information, Winbind maps the
NT account information onto UNIX user and group names.</p></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2949726"></a>Microsoft Active Directory Services</h3></div></div><div></div></div><p>
Since late 2001, Samba has gained the ability to
interact with Microsoft Windows 2000 using its “<span class="quote">Native
Mode</span>” protocols, rather than the NT4 RPC services.
Using LDAP and Kerberos, a Domain Member running
Winbind can enumerate users and groups in exactly the
same way as a Windows 200x client would, and in so doing
provide a much more efficient and effective Winbind implementation.
</p></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2949752"></a>Name Service Switch</h3></div></div><div></div></div><p>The Name Service Switch, or NSS, is a feature that is
present in many UNIX operating systems. It allows system
information such as hostnames, mail aliases and user information
to be resolved from different sources. For example, a standalone
UNIX workstation may resolve system information from a series of
flat files stored on the local filesystem. A networked workstation
may first attempt to resolve system information from local files,
and then consult an NIS database for user information or a DNS server
for hostname information.</p><p>The NSS application programming interface allows Winbind
to present itself as a source of system information when
resolving UNIX usernames and groups. Winbind uses this interface,
and information obtained from a Windows NT server using MSRPC
calls to provide a new source of account enumeration. Using standard
UNIX library calls, one can enumerate the users and groups on
a UNIX machine running Winbind and see all users and groups in
a NT domain plus any trusted domain as though they were local
users and groups.</p><p>The primary control file for NSS is
<tt class="filename">/etc/nsswitch.conf</tt>.
When a UNIX application makes a request to do a lookup,
the C library looks in <tt class="filename">/etc/nsswitch.conf</tt>
for a line that matches the service type being requested, for
example the “<span class="quote">passwd</span>” service type is used when user or group names
are looked up. This config line specifies which implementations
of that service should be tried and in what order. If the passwd
config line is:</p><pre class="screen">
passwd: files example
</pre><p>then the C library will first load a module called
<tt class="filename">/lib/libnss_files.so</tt> followed by
the module <tt class="filename">/lib/libnss_example.so</tt>. The
C library will dynamically load each of these modules in turn
and call resolver functions within the modules to try to resolve
the request. Once the request is resolved, the C library returns the
result to the application.</p><p>This NSS interface provides an easy way for Winbind
to hook into the operating system. All that needs to be done
is to put <tt class="filename">libnss_winbind.so</tt> in <tt class="filename">/lib/</tt>
then add “<span class="quote">winbind</span>” into <tt class="filename">/etc/nsswitch.conf</tt> at
the appropriate place. The C library will then call Winbind to
resolve user and group names.</p></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2949887"></a>Pluggable Authentication Modules</h3></div></div><div></div></div><p>Pluggable Authentication Modules, also known as PAM,
is a system for abstracting authentication and authorization
technologies. With a PAM module it is possible to specify different
authentication methods for different system applications without
having to recompile these applications. PAM is also useful
for implementing a particular policy for authorization. For example,
a system administrator may only allow console logins from users
stored in the local password file but only allow users resolved from
a NIS database to log in over the network.</p><p>Winbind uses the authentication management and password
management PAM interface to integrate Windows NT users into a
UNIX system. This allows Windows NT users to log in to a UNIX
machine and be authenticated against a suitable Primary Domain
Controller. These users can also change their passwords and have
this change take effect directly on the Primary Domain Controller.
</p><p>PAM is configured by providing control files in the directory
<tt class="filename">/etc/pam.d/</tt> for each of the services that
require authentication. When an authentication request is made
by an application, the PAM code in the C library looks up this
control file to determine what modules to load to do the
authentication check and in what order. This interface makes adding
a new authentication service for Winbind very easy. All that needs
to be done is that the <tt class="filename">pam_winbind.so</tt> module
is copied to <tt class="filename">/lib/security/</tt> and the PAM
control files for relevant services are updated to allow
authentication via Winbind. See the PAM documentation
in <link linkend="pam"> for more information.</p></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2949965"></a>User and Group ID Allocation</h3></div></div><div></div></div><p>When a user or group is created under Windows NT/200x
it is allocated a numerical relative identifier (RID). This is
slightly different from UNIX which has a range of numbers that are
used to identify users, and the same range in which to identify
groups. It is Winbind's job to convert RIDs to UNIX ID numbers and
vice versa. When Winbind is configured, it is given part of the UNIX
user ID space and a part of the UNIX group ID space in which to
store Windows NT users and groups. If a Windows NT user is
resolved for the first time, it is allocated the next UNIX ID from
the range. The same process applies for Windows NT groups. Over
time, Winbind will have mapped all Windows NT users and groups
to UNIX user IDs and group IDs.</p><p>The results of this mapping are stored persistently in
an ID mapping database held in a tdb database). This ensures that
RIDs are mapped to UNIX IDs in a consistent way.</p></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2949998"></a>Result Caching</h3></div></div><div></div></div><p>
<a class="indexterm" name="id2950010"></a>
An active system can generate a lot of user and group
name lookups. To reduce the network cost of these lookups, Winbind
uses a caching scheme based on the SAM sequence number supplied
by NT Domain Controllers. User or group information returned
by a PDC is cached by Winbind along with a sequence number also
returned by the PDC. This sequence number is incremented by
Windows NT whenever any user or group information is modified. If
a cached entry has expired, the sequence number is requested from
the PDC and compared against the sequence number of the cached entry.
If the sequence numbers do not match, then the cached information
is discarded and up-to-date information is requested directly
from the PDC.</p></div></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2950035"></a>Installation and Configuration</h2></div></div><div></div></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2950042"></a>Introduction</h3></div></div><div></div></div><p>
This section describes the procedures used to get Winbind up and
running. Winbind is capable of providing access
and authentication control for Windows Domain users through an NT
or Windows 200x PDC for regular services, such as telnet and ftp, as
well for Samba services.
</p><div class="itemizedlist"><ul type="disc"><li><p>
<span class="emphasis"><em>Why should I do this?</em></span>
</p><p>This allows the Samba administrator to rely on the
authentication mechanisms on the Windows NT/200x PDC for the authentication
of Domain Members. Windows NT/200x users no longer need to have separate
accounts on the Samba server.
</p></li><li><p>
<span class="emphasis"><em>Who should be reading this document?</em></span>
</p><p>
This document is designed for system administrators. If you are
implementing Samba on a file server and wish to (fairly easily)
integrate existing Windows NT/200x users from your PDC onto the
Samba server, this document is for you.
</p></li></ul></div></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2950108"></a>Requirements</h3></div></div><div></div></div><p>
If you have a Samba configuration file that you are currently using, <span class="emphasis"><em>BACK IT UP!</em></span>
If your system already uses PAM, <span class="emphasis"><em>back up the <tt class="filename">/etc/pam.d</tt> directory
contents!</em></span> If you haven't already made a boot disk, <span class="emphasis"><em>MAKE ONE NOW!</em></span>
</p><p>
Messing with the PAM configuration files can make it nearly impossible to log in to your machine. That's
why you want to be able to boot back into your machine in single user mode and restore your
<tt class="filename">/etc/pam.d</tt> back to the original state they were in if you get frustrated with the
way things are going.
</p><p>
The latest version of Samba-3 includes a functioning winbindd daemon. Please refer to the <ulink url="http://samba.org/">main Samba Web page</ulink> or, better yet, your closest Samba mirror site for
instructions on downloading the source code.
</p><p>
To allow domain users the ability to access Samba shares and files, as well as potentially other services
provided by your Samba machine, PAM must be set up properly on your
machine. In order to compile the Winbind modules, you should have at least the PAM development libraries installed
on your system. Please refer the PAM web site <ulink url="http://www.kernel.org/pub/linux/libs/pam/">http://www.kernel.org/pub/linux/libs/pam/</ulink>.
</p></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2950191"></a>Testing Things Out</h3></div></div><div></div></div><p>
Before starting, it is probably best to kill off all the Samba-related daemons running on your server.
Kill off all <span class="application">smbd</span>, <span class="application">nmbd</span>, and <span class="application">winbindd</span> processes that may be running. To use PAM,
make sure that you have the standard PAM package that supplies the <tt class="filename">/etc/pam.d</tt>
directory structure, including the PAM modules that are used by PAM-aware services, several pam libraries,
and the <tt class="filename">/usr/doc</tt> and <tt class="filename">/usr/man</tt> entries for pam. Winbind built
better in Samba if the pam-devel package is also installed. This package includes the header files
needed to compile PAM-aware applications.
</p><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2950252"></a>Configure <tt class="filename">nsswitch.conf</tt> and the Winbind Libraries on Linux and Solaris</h4></div></div><div></div></div><p>
PAM is a standard component of most current generation UNIX/Linux systems. Unfortunately, few systems install
the <tt class="filename">pam-devel</tt> libraries that are needed to build PAM-enabled Samba. Additionally, Samba-3
may auto-install the Winbind files into their correct locations on your system, so before you get too far down
the track be sure to check if the following configuration is really
necessary. You may only need to configure
<tt class="filename">/etc/nsswitch.conf</tt>.
</p><p>
The libraries needed to run the <span class="application">winbindd</span> daemon through nsswitch need to be copied to their proper locations:
</p><p>
</p><pre class="screen">
<tt class="prompt">root# </tt><b class="userinput"><tt>cp ../samba/source/nsswitch/libnss_winbind.so /lib</tt></b>
</pre><p>
</p><p>
I also found it necessary to make the following symbolic link:
</p><p>
<tt class="prompt">root# </tt> <b class="userinput"><tt>ln -s /lib/libnss_winbind.so /lib/libnss_winbind.so.2</tt></b>
</p><p>And, in the case of Sun Solaris:</p><pre class="screen">
<tt class="prompt">root# </tt><b class="userinput"><tt>ln -s /usr/lib/libnss_winbind.so /usr/lib/libnss_winbind.so.1</tt></b>
<tt class="prompt">root# </tt><b class="userinput"><tt>ln -s /usr/lib/libnss_winbind.so /usr/lib/nss_winbind.so.1</tt></b>
<tt class="prompt">root# </tt><b class="userinput"><tt>ln -s /usr/lib/libnss_winbind.so /usr/lib/nss_winbind.so.2</tt></b>
</pre><p>
Now, as root you need to edit <tt class="filename">/etc/nsswitch.conf</tt> to
allow user and group entries to be visible from the <span class="application">winbindd</span>
daemon. My <tt class="filename">/etc/nsswitch.conf</tt> file look like
this after editing:
</p><pre class="programlisting">
passwd: files winbind
shadow: files
group: files winbind
</pre><p>
The libraries needed by the <b class="command">winbindd</b> daemon will be automatically
entered into the <b class="command">ldconfig</b> cache the next time
your system reboots, but it is faster (and you do not need to reboot) if you do it manually:
</p><p>
<tt class="prompt">root# </tt><b class="userinput"><tt>/sbin/ldconfig -v | grep winbind</tt></b>
</p><p>
This makes <tt class="filename">libnss_winbind</tt> available to winbindd
and echos back a check to you.
</p></div><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2950492"></a>NSS Winbind on AIX</h4></div></div><div></div></div><p>(This section is only for those running AIX.)</p><p>
The Winbind AIX identification module gets built as <tt class="filename">libnss_winbind.so</tt> in the
nsswitch directory of the Samba source. This file can be copied to <tt class="filename">/usr/lib/security</tt>,
and the AIX naming convention would indicate that it should be named WINBIND. A stanza like the following:
</p><pre class="programlisting">
WINBIND:
program = /usr/lib/security/WINBIND
options = authonly
</pre><p>
can then be added to <tt class="filename">/usr/lib/security/methods.cfg</tt>. This module only supports
identification, but there have been success reports using the standard Winbind PAM module for
authentication. Use caution configuring loadable authentication
modules since you can make
it impossible to logon to the system. More information about the AIX authentication module API can
be found at “<span class="quote">Kernel Extensions and Device Support Programming Concepts for AIX</span>”<ulink url="http://publibn.boulder.ibm.com/doc_link/en_US/a_doc_lib/aixprggd/kernextc/sec_load_mod.htm">
in Chapter 18(John, there is no section like this in 18). Loadable Authentication Module Programming
Interface</ulink> and more information on administering the modules
can be found at <ulink url="http://publibn.boulder.ibm.com/doc_link/en_US/a_doc_lib/aixbman/baseadmn/iandaadmin.htm"> System
Management Guide: Operating System and Devices.</ulink>
</p></div><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2950584"></a>Configure smb.conf</h4></div></div><div></div></div><p>
Several parameters are needed in the <tt class="filename">smb.conf</tt> file to control the behavior of <span class="application">winbindd</span>. These
are described in more detail in the <a href="winbindd.8.html"><span class="citerefentry"><span class="refentrytitle">winbindd</span>(8)</span></a> man page. My <tt class="filename">smb.conf</tt> file, as shown in <link linkend="winbindcfg">, was modified to include the necessary entries in the [global] section.
</p><div class="example"><a name="winbindcfg"></a><p class="title"><b>Example 21.1. smb.conf for Winbind set-up</b></p><table class="simplelist" border="0" summary="Simple list"><tr><td> </td></tr><tr><td><i class="parameter"><tt>[global]</tt></i></td></tr><tr><td># separate domain and username with '+', like DOMAIN+username</td></tr><tr><td><i class="parameter"><tt>winbind separator = +</tt></i></td></tr><tr><td># use uids from 10000 to 20000 for domain users</td></tr><tr><td><i class="parameter"><tt>idmap uid = 10000-20000</tt></i></td></tr><tr><td># use gids from 10000 to 20000 for domain groups</td></tr><tr><td><i class="parameter"><tt>winbind gid = 10000-20000</tt></i></td></tr><tr><td># allow enumeration of winbind users and groups</td></tr><tr><td><i class="parameter"><tt>winbind enum users = yes</tt></i></td></tr><tr><td><i class="parameter"><tt>winbind enum groups = yes</tt></i></td></tr><tr><td># give winbind users a real shell (only needed if they have telnet access)</td></tr><tr><td><i class="parameter"><tt>template homedir = /home/winnt/%D/%U</tt></i></td></tr><tr><td><i class="parameter"><tt>template shell = /bin/bash</tt></i></td></tr></table></div></div><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2950748"></a>Join the Samba Server to the PDC Domain</h4></div></div><div></div></div><p>
Enter the following command to make the Samba server join the
PDC domain, where <i class="replaceable"><tt>DOMAIN</tt></i> is the name of
your Windows domain and <i class="replaceable"><tt>Administrator</tt></i> is
a domain user who has administrative privileges in the domain.
</p><p>
<tt class="prompt">root# </tt><b class="userinput"><tt>/usr/local/samba/bin/net rpc join -S PDC -U Administrator</tt></b>
</p><p>
The proper response to the command should be: “<span class="quote">Joined the domain
<i class="replaceable"><tt>DOMAIN</tt></i></span>” where <i class="replaceable"><tt>DOMAIN</tt></i>
is your DOMAIN name.
</p></div><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2950807"></a>Starting and Testing the <b class="command">winbindd</b> Daemon</h4></div></div><div></div></div><p>
Eventually, you will want to modify your Samba startup script to
automatically invoke the winbindd daemon when the other parts of
Samba start, but it is possible to test out just the Winbind
portion first. To start up Winbind services, enter the following
command as root:
</p><p>
<tt class="prompt">root# </tt><b class="userinput"><tt>/usr/local/samba/bin/winbindd</tt></b>
</p><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3><p>
The above assumes that Samba has been installed in the <tt class="filename">/usr/local/samba</tt>
directory tree. You may need to search for the location of Samba files if this is not the
location of <b class="command">winbindd</b> on your system.
</p></div><p>
Winbindd can now also run in “<span class="quote">dual daemon modei</span>”. This will make it
run as two processes. The first will answer all requests from the cache,
thus making responses to clients faster. The other will
update the cache for the query that the first has just responded.
The advantage of this is that responses stay accurate and are faster.
You can enable dual daemon mode by adding <tt class="option">-B</tt> to the commandline:
</p><p>
<tt class="prompt">root# </tt><b class="userinput"><tt>/usr/local/samba/bin/winbindd -B</tt></b>
</p><p>
I'm always paranoid and like to make sure the daemon is really running.
</p><p>
<tt class="prompt">root# </tt><b class="userinput"><tt>ps -ae | grep winbindd</tt></b>
</p><p>
This command should produce output like this, if the daemon is running you would expect
to see a report something like this:
</p><pre class="screen">
3025 ? 00:00:00 winbindd
</pre><p>
Now, for the real test, try to get some information about the users on your PDC:
</p><p>
<tt class="prompt">root# </tt><b class="userinput"><tt>/usr/local/samba/bin/wbinfo -u</tt></b>
</p><p>
This should echo back a list of users on your Windows users on
your PDC. For example, I get the following response:
</p><pre class="screen">
CEO+Administrator
CEO+burdell
CEO+Guest
CEO+jt-ad
CEO+krbtgt
CEO+TsInternetUser
</pre><p>
Obviously, I have named my domain “<span class="quote">CEO</span>” and my <a class="indexterm" name="id2950988"></a><i class="parameter"><tt>winbind separator</tt></i> is “<span class="quote">+</span>”.
</p><p>
You can do the same sort of thing to get group information from the PDC:
</p><pre class="screen">
<tt class="prompt">root# </tt><b class="userinput"><tt>/usr/local/samba/bin/wbinfo -g</tt></b>
CEO+Domain Admins
CEO+Domain Users
CEO+Domain Guests
CEO+Domain Computers
CEO+Domain Controllers
CEO+Cert Publishers
CEO+Schema Admins
CEO+Enterprise Admins
CEO+Group Policy Creator Owners
</pre><p>
The function <b class="command">getent</b> can now be used to get unified
lists of both local and PDC users and groups. Try the following command:
</p><p>
<tt class="prompt">root# </tt><b class="userinput"><tt>getent passwd</tt></b>
</p><p>
You should get a list that looks like your <tt class="filename">/etc/passwd</tt>
list followed by the domain users with their new UIDs, GIDs, home
directories and default shells.
</p><p>
The same thing can be done for groups with the command:
</p><p>
<tt class="prompt">root# </tt><b class="userinput"><tt>getent group</tt></b>
</p></div><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2951103"></a>Fix the init.d Startup Scripts</h4></div></div><div></div></div><div class="sect4" lang="en"><div class="titlepage"><div><div><h5 class="title"><a name="id2951110"></a>Linux</h5></div></div><div></div></div><p>
The <span class="application">winbindd</span> daemon needs to start up after the <span class="application">smbd</span> and <span class="application">nmbd</span> daemons are running.
To accomplish this task, you need to modify the startup scripts of your system.
They are located at <tt class="filename">/etc/init.d/smb</tt> in Red Hat Linux and they are located in
<tt class="filename">/etc/init.d/samba</tt> in Debian Linux. Edit your
script to add commands to invoke this daemon in the proper sequence. My
startup script starts up <span class="application">smbd</span>, <span class="application">nmbd</span>, and <span class="application">winbindd</span> from the
<tt class="filename">/usr/local/samba/bin</tt> directory directly. The <b class="command">start</b>
function in the script looks like this:
</p><pre class="programlisting">
start() {
KIND="SMB"
echo -n $"Starting $KIND services: "
daemon /usr/local/samba/bin/smbd $SMBDOPTIONS
RETVAL=$?
echo
KIND="NMB"
echo -n $"Starting $KIND services: "
daemon /usr/local/samba/bin/nmbd $NMBDOPTIONS
RETVAL2=$?
echo
KIND="Winbind"
echo -n $"Starting $KIND services: "
daemon /usr/local/samba/bin/winbindd
RETVAL3=$?
echo
[ $RETVAL -eq 0 -a $RETVAL2 -eq 0 -a $RETVAL3 -eq 0 ] && \
touch /var/lock/subsys/smb || RETVAL=1
return $RETVAL
}
</pre><p>If you would like to run winbindd in dual daemon mode, replace
the line :
</p><pre class="programlisting">
daemon /usr/local/samba/bin/winbindd
</pre><p>
in the example above with:
</p><pre class="programlisting">
daemon /usr/local/samba/bin/winbindd -B
</pre><p>.
</p><p>
The <b class="command">stop</b> function has a corresponding entry to shut down the
services and looks like this:
</p><pre class="programlisting">
stop() {
KIND="SMB"
echo -n $"Shutting down $KIND services: "
killproc smbd
RETVAL=$?
echo
KIND="NMB"
echo -n $"Shutting down $KIND services: "
killproc nmbd
RETVAL2=$?
echo
KIND="Winbind"
echo -n $"Shutting down $KIND services: "
killproc winbindd
RETVAL3=$?
[ $RETVAL -eq 0 -a $RETVAL2 -eq 0 -a $RETVAL3 -eq 0 ] && \
rm -f /var/lock/subsys/smb
echo ""
return $RETVAL
}
</pre></div><div class="sect4" lang="en"><div class="titlepage"><div><div><h5 class="title"><a name="id2951286"></a>Solaris</h5></div></div><div></div></div><p>
Winbind does not work on Solaris 9, see <link linkend="winbind-solaris9"> for details.
</p><p>
On Solaris, you need to modify the <tt class="filename">/etc/init.d/samba.server</tt> startup script. It
usually only starts smbd and nmbd but should now start winbindd, too. If you have Samba installed in
<tt class="filename">/usr/local/samba/bin</tt>, the file could contains something like this:
</p><pre class="programlisting">
##
## samba.server
##
if [ ! -d /usr/bin ]
then # /usr not mounted
exit
fi
killproc() { # kill the named process(es)
pid=`/usr/bin/ps -e |
/usr/bin/grep -w $1 |
/usr/bin/sed -e 's/^ *//' -e 's/ .*//'`
[ "$pid" != "" ] && kill $pid
}
# Start/stop processes required for Samba server
case "$1" in
'start')
#
# Edit these lines to suit your installation (paths, workgroup, host)
#
echo Starting SMBD
/usr/local/samba/bin/smbd -D -s \
/usr/local/samba/smb.conf
echo Starting NMBD
/usr/local/samba/bin/nmbd -D -l \
/usr/local/samba/var/log -s /usr/local/samba/smb.conf
echo Starting Winbind Daemon
/usr/local/samba/bin/winbindd
;;
'stop')
killproc nmbd
killproc smbd
killproc winbindd
;;
*)
echo "Usage: /etc/init.d/samba.server { start | stop }"
;;
esac
</pre><p>
Again, if you would like to run Samba in dual daemon mode, replace:
</p><pre class="programlisting">
/usr/local/samba/bin/winbindd
</pre><p>
in the script above with:
</p><pre class="programlisting">
/usr/local/samba/bin/winbindd -B
</pre><p>
</p></div><div class="sect4" lang="en"><div class="titlepage"><div><div><h5 class="title"><a name="id2951403"></a>Restarting</h5></div></div><div></div></div><p>
If you restart the <span class="application">smbd</span>, <span class="application">nmbd</span>, and <span class="application">winbindd</span> daemons at this point, you
should be able to connect to the Samba server as a Domain Member just as
if you were a local user.
</p></div></div><div class="sect3" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="id2951439"></a>Configure Winbind and PAM</h4></div></div><div></div></div><p>
If you have made it this far, you know that <b class="command">winbindd</b> and Samba are working
together. If you want to use Winbind to provide authentication for other
services, keep reading. The PAM configuration files need to be altered in
this step. (Did you remember to make backups of your original
<tt class="filename">/etc/pam.d</tt> files? If not, do it now.)
</p><p>
You will need a PAM module to use winbindd with these other services. This
module will be compiled in the <tt class="filename">../source/nsswitch</tt> directory
by invoking the command:
</p><p>
<tt class="prompt">root# </tt><b class="userinput"><tt>make nsswitch/pam_winbind.so</tt></b>
</p><p>
from the <tt class="filename">../source</tt> directory. The
<tt class="filename">pam_winbind.so</tt> file should be copied to the location of
your other PAM security modules. On my RedHat system, this was the
<tt class="filename">/lib/security</tt> directory. On Solaris, the PAM security
modules reside in <tt class="filename">/usr/lib/security</tt>.
</p><p>
<tt class="prompt">root# </tt><b class="userinput"><tt>cp ../samba/source/nsswitch/pam_winbind.so /lib/security</tt></b>
</p><div class="sect4" lang="en"><div class="titlepage"><div><div><h5 class="title"><a name="id2951551"></a>Linux/FreeBSD-specific PAM configuration</h5></div></div><div></div></div><p>
The <tt class="filename">/etc/pam.d/samba</tt> file does not need to be changed. I
just left this file as it was:
</p><pre class="programlisting">
auth required /lib/security/pam_stack.so service=system-auth
account required /lib/security/pam_stack.so service=system-auth
</pre><p>
The other services that I modified to allow the use of Winbind
as an authentication service were the normal login on the console (or a terminal
session), telnet logins, and ftp service. In order to enable these
services, you may first need to change the entries in
<tt class="filename">/etc/xinetd.d</tt> (or <tt class="filename">/etc/inetd.conf</tt>).
Red Hat Linux 7.1 and later uses the new xinetd.d structure, in this case you need
to change the lines in <tt class="filename">/etc/xinetd.d/telnet</tt>
and <tt class="filename">/etc/xinetd.d/wu-ftp</tt> from
</p><pre class="programlisting">
enable = no
</pre><p>
to:
</p><pre class="programlisting">
enable = yes
</pre><p>
For ftp services to work properly, you will also need to either
have individual directories for the domain users already present on
the server, or change the home directory template to a general
directory for all domain users. These can be easily set using
the <tt class="filename">smb.conf</tt> global entry
<a class="indexterm" name="id2951653"></a><i class="parameter"><tt>template homedir</tt></i>.
</p><p>
The <tt class="filename">/etc/pam.d/ftp</tt> file can be changed
to allow Winbind ftp access in a manner similar to the
samba file. My <tt class="filename">/etc/pam.d/ftp</tt> file was
changed to look like this:
</p><pre class="programlisting">
auth required /lib/security/pam_listfile.so item=user sense=deny \
file=/etc/ftpusers onerr=succeed
auth sufficient /lib/security/pam_winbind.so
auth required /lib/security/pam_stack.so service=system-auth
auth required /lib/security/pam_shells.so
account sufficient /lib/security/pam_winbind.so
account required /lib/security/pam_stack.so service=system-auth
session required /lib/security/pam_stack.so service=system-auth
</pre><p>
The <tt class="filename">/etc/pam.d/login</tt> file can be changed nearly the
same way. It now looks like this:
</p><pre class="programlisting">
auth required /lib/security/pam_securetty.so
auth sufficient /lib/security/pam_winbind.so
auth sufficient /lib/security/pam_UNIX.so use_first_pass
auth required /lib/security/pam_stack.so service=system-auth
auth required /lib/security/pam_nologin.so
account sufficient /lib/security/pam_winbind.so
account required /lib/security/pam_stack.so service=system-auth
password required /lib/security/pam_stack.so service=system-auth
session required /lib/security/pam_stack.so service=system-auth
session optional /lib/security/pam_console.so
</pre><p>
In this case, I added the </p><pre class="programlisting">auth sufficient /lib/security/pam_winbind.so</pre><p>
lines as before, but also added the </p><pre class="programlisting">required pam_securetty.so</pre><p>
above it, to disallow root logins over the network. I also added a
</p><pre class="programlisting">sufficient /lib/security/pam_unix.so use_first_pass</pre><p>
line after the <b class="command">winbind.so</b> line to get rid of annoying
double prompts for passwords.
</p></div><div class="sect4" lang="en"><div class="titlepage"><div><div><h5 class="title"><a name="id2951787"></a>Solaris-specific configuration</h5></div></div><div></div></div><p>
The <tt class="filename">/etc/pam.conf</tt> needs to be changed. I changed this file so my Domain
users can logon both locally as well as telnet. The following are the changes
that I made. You can customize the <tt class="filename">pam.conf</tt> file as per your requirements, but
be sure of those changes because in the worst case it will leave your system
nearly impossible to boot.
</p><pre class="programlisting">
#
#ident "@(#)pam.conf 1.14 99/09/16 SMI"
#
# Copyright (c) 1996-1999, Sun Microsystems, Inc.
# All Rights Reserved.
#
# PAM configuration
#
# Authentication management
#
login auth required /usr/lib/security/pam_winbind.so
login auth required /usr/lib/security/$ISA/pam_UNIX.so.1 try_first_pass
login auth required /usr/lib/security/$ISA/pam_dial_auth.so.1 try_first_pass
#
rlogin auth sufficient /usr/lib/security/pam_winbind.so
rlogin auth sufficient /usr/lib/security/$ISA/pam_rhosts_auth.so.1
rlogin auth required /usr/lib/security/$ISA/pam_UNIX.so.1 try_first_pass
#
dtlogin auth sufficient /usr/lib/security/pam_winbind.so
dtlogin auth required /usr/lib/security/$ISA/pam_UNIX.so.1 try_first_pass
#
rsh auth required /usr/lib/security/$ISA/pam_rhosts_auth.so.1
other auth sufficient /usr/lib/security/pam_winbind.so
other auth required /usr/lib/security/$ISA/pam_UNIX.so.1 try_first_pass
#
# Account management
#
login account sufficient /usr/lib/security/pam_winbind.so
login account requisite /usr/lib/security/$ISA/pam_roles.so.1
login account required /usr/lib/security/$ISA/pam_UNIX.so.1
#
dtlogin account sufficient /usr/lib/security/pam_winbind.so
dtlogin account requisite /usr/lib/security/$ISA/pam_roles.so.1
dtlogin account required /usr/lib/security/$ISA/pam_UNIX.so.1
#
other account sufficient /usr/lib/security/pam_winbind.so
other account requisite /usr/lib/security/$ISA/pam_roles.so.1
other account required /usr/lib/security/$ISA/pam_UNIX.so.1
#
# Session management
#
other session required /usr/lib/security/$ISA/pam_UNIX.so.1
#
# Password management
#
#other password sufficient /usr/lib/security/pam_winbind.so
other password required /usr/lib/security/$ISA/pam_UNIX.so.1
dtsession auth required /usr/lib/security/$ISA/pam_UNIX.so.1
#
# Support for Kerberos V5 authentication (uncomment to use Kerberos)
#
#rlogin auth optional /usr/lib/security/$ISA/pam_krb5.so.1 try_first_pass
#login auth optional /usr/lib/security/$ISA/pam_krb5.so.1 try_first_pass
#dtlogin auth optional /usr/lib/security/$ISA/pam_krb5.so.1 try_first_pass
#other auth optional /usr/lib/security/$ISA/pam_krb5.so.1 try_first_pass
#dtlogin account optional /usr/lib/security/$ISA/pam_krb5.so.1
#other account optional /usr/lib/security/$ISA/pam_krb5.so.1
#other session optional /usr/lib/security/$ISA/pam_krb5.so.1
#other password optional /usr/lib/security/$ISA/pam_krb5.so.1 try_first_pass
</pre><p>
I also added a <i class="parameter"><tt>try_first_pass</tt></i> line after the <tt class="filename">winbind.so</tt>
line to get rid of annoying double prompts for passwords.
</p><p>
Now restart your Samba and try connecting through your application that you
configured in the pam.conf.
</p></div></div></div></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2951948"></a>Conclusion</h2></div></div><div></div></div><p>The Winbind system, through the use of the Name Service
Switch, Pluggable Authentication Modules, and appropriate
Microsoft RPC calls have allowed us to provide seamless
integration of Microsoft Windows NT domain users on a
UNIX system. The result is a great reduction in the administrative
cost of running a mixed UNIX and NT network.</p></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2951967"></a>Common Errors</h2></div></div><div></div></div><p>Winbind has a number of limitations in its current
released version that we hope to overcome in future
releases:</p><div class="itemizedlist"><ul type="disc"><li><p>Winbind is currently only available for
the Linux, Solaris, AIX, and IRIX operating systems, although ports to other operating
systems are certainly possible. For such ports to be feasible,
we require the C library of the target operating system to
support the Name Service Switch and Pluggable Authentication
Modules systems. This is becoming more common as NSS and
PAM gain support among UNIX vendors.</p></li><li><p>The mappings of Windows NT RIDs to UNIX IDs
is not made algorithmically and depends on the order in which
unmapped users or groups are seen by Winbind. It may be difficult
to recover the mappings of RID to UNIX ID mapping if the file
containing this information is corrupted or destroyed.</p></li><li><p>Currently the Winbind PAM module does not take
into account possible workstation and logon time restrictions
that may be set for Windows NT users, this is
instead up to the PDC to enforce.</p></li></ul></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2952021"></a>NSCD Problem Warning</h3></div></div><div></div></div><div class="warning" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Warning</h3><p>
Do not under any circumstances run <b class="command">nscd</b> on any system
on which <b class="command">winbindd</b> is running.
</p></div><p>
If <b class="command">nscd</b> is running on the UNIX/Linux system, then
even though NSSWITCH is correctly configured it will not be possible to resolve
domain users and groups for file and directory controls.
</p></div><div class="sect2" lang="en"><div class="titlepage"><div><div><h3 class="title"><a name="id2952067"></a>Winbind Is Not Resolving Users and Groups</h3></div></div><div></div></div><p>“<span class="quote">
My <tt class="filename">smb.conf</tt> file is correctly configured. I have specified
<a class="indexterm" name="id2952087"></a><i class="parameter"><tt>idmap uid</tt></i> = 12000,
and <a class="indexterm" name="id2952101"></a><i class="parameter"><tt>idmap gid</tt></i> = 3000-3500
and <b class="command">winbind</b> is running. When I do the following it all works fine.
</span>”</p><pre class="screen">
<tt class="prompt">root# </tt><b class="userinput"><tt>wbinfo -u</tt></b>
MIDEARTH+maryo
MIDEARTH+jackb
MIDEARTH+ameds
...
MIDEARTH+root
<tt class="prompt">root# </tt><b class="userinput"><tt>wbinfo -g</tt></b>
MIDEARTH+Domain Users
MIDEARTH+Domain Admins
MIDEARTH+Domain Guests
...
MIDEARTH+Accounts
<tt class="prompt">root# </tt><b class="userinput"><tt>getent passwd</tt></b>
root:x:0:0:root:/root:/bin/bash
bin:x:1:1:bin:/bin:/bin/bash
...
maryo:x:15000:15003:Mary Orville:/home/MIDEARTH/maryo:/bin/false
</pre><p>“<span class="quote">
But the following command just fails:
<pre class="screen">
<tt class="prompt">root# </tt><b class="userinput"><tt>chown maryo a_file</tt></b>
chown: `maryo': invalid user
</pre>
This is driving me nuts! What can be wrong?
</span>”</p><p>
Same problem as the one above.
Your system is likely running <b class="command">nscd</b>, the name service
caching daemon. Shut it down, do not restart it! You will find your problem resolved.
</p></div></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="VFS.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="optional.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="AdvancedNetworkManagement.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 20. Stackable VFS modules </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 22. Advanced Network Management</td></tr></table></div></body></html>
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