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<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>winbindd</title><link rel="stylesheet" href="../samba.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.73.1"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry" lang="en"><a name="winbindd.8"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>winbindd — Name Service Switch daemon for resolving names
from NT servers</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="cmdsynopsis"><p><code class="literal">winbindd</code> [-D] [-F] [-S] [-i] [-Y] [-d <debug level>] [-s <smb config file>] [-n]</p></div></div><div class="refsect1" lang="en"><a name="id2479179"></a><h2>DESCRIPTION</h2><p>This program is part of the <a class="citerefentry" href="samba.7.html"><span class="citerefentry"><span class="refentrytitle">samba</span>(7)</span></a> suite.</p><p><code class="literal">winbindd</code> is a daemon that provides
a number of services to the Name Service Switch capability found
in most modern C libraries, to arbitrary applications via PAM
and <code class="literal">ntlm_auth</code> and to Samba itself.</p><p>Even if winbind is not used for nsswitch, it still provides a
service to <code class="literal">smbd</code>, <code class="literal">ntlm_auth</code>
and the <code class="literal">pam_winbind.so</code> PAM module, by managing connections to
domain controllers. In this configuraiton the
<a class="link" href="smb.conf.5.html#IDMAPUID">idmap uid</a> and
<a class="link" href="smb.conf.5.html#IDMAPGID">idmap gid</a>
parameters are not required. (This is known as `netlogon proxy only mode'.)</p><p> The Name Service Switch allows user
and system information to be obtained from different databases
services such as NIS or DNS. The exact behaviour can be configured
throught the <code class="filename">/etc/nsswitch.conf</code> file.
Users and groups are allocated as they are resolved to a range
of user and group ids specified by the administrator of the
Samba system.</p><p>The service provided by <code class="literal">winbindd</code> is called `winbind' and
can be used to resolve user and group information from a
Windows NT server. The service can also provide authentication
services via an associated PAM module. </p><p>
The <code class="filename">pam_winbind</code> module supports the
<em class="parameter"><code>auth</code></em>, <em class="parameter"><code>account</code></em>
and <em class="parameter"><code>password</code></em>
module-types. It should be noted that the
<em class="parameter"><code>account</code></em> module simply performs a getpwnam() to verify that
the system can obtain a uid for the user, as the domain
controller has already performed access control. If the
<code class="filename">libnss_winbind</code> library has been correctly
installed, or an alternate source of names configured, this should always succeed.
</p><p>The following nsswitch databases are implemented by
the winbindd service: </p><div class="variablelist"><dl><dt><span class="term">-D</span></dt><dd><p>If specified, this parameter causes
the server to operate as a daemon. That is, it detaches
itself and runs in the background on the appropriate port.
This switch is assumed if <code class="literal">winbindd</code> is
executed on the command line of a shell.
</p></dd><dt><span class="term">hosts</span></dt><dd><p>This feature is only available on IRIX.
User information traditionally stored in
the <code class="filename">hosts(5)</code> file and used by
<code class="literal">gethostbyname(3)</code> functions. Names are
resolved through the WINS server or by broadcast.
</p></dd><dt><span class="term">passwd</span></dt><dd><p>User information traditionally stored in
the <code class="filename">passwd(5)</code> file and used by
<code class="literal">getpwent(3)</code> functions. </p></dd><dt><span class="term">group</span></dt><dd><p>Group information traditionally stored in
the <code class="filename">group(5)</code> file and used by
<code class="literal">getgrent(3)</code> functions. </p></dd></dl></div><p>For example, the following simple configuration in the
<code class="filename">/etc/nsswitch.conf</code> file can be used to initially
resolve user and group information from <code class="filename">/etc/passwd
</code> and <code class="filename">/etc/group</code> and then from the
Windows NT server.
</p><pre class="programlisting">
passwd: files winbind
group: files winbind
## only available on IRIX: use winbind to resolve hosts:
# hosts: files dns winbind
## All other NSS enabled systems should use libnss_wins.so like this:
hosts: files dns wins
</pre><p>The following simple configuration in the
<code class="filename">/etc/nsswitch.conf</code> file can be used to initially
resolve hostnames from <code class="filename">/etc/hosts</code> and then from the
WINS server.</p><pre class="programlisting">
hosts: files wins
</pre></div><div class="refsect1" lang="en"><a name="id2478337"></a><h2>OPTIONS</h2><div class="variablelist"><dl><dt><span class="term">-F</span></dt><dd><p>If specified, this parameter causes
the main <code class="literal">winbindd</code> process to not daemonize,
i.e. double-fork and disassociate with the terminal.
Child processes are still created as normal to service
each connection request, but the main process does not
exit. This operation mode is suitable for running
<code class="literal">winbindd</code> under process supervisors such
as <code class="literal">supervise</code> and <code class="literal">svscan</code>
from Daniel J. Bernstein's <code class="literal">daemontools</code>
package, or the AIX process monitor.
</p></dd><dt><span class="term">-S</span></dt><dd><p>If specified, this parameter causes
<code class="literal">winbindd</code> to log to standard output rather
than a file.</p></dd><dt><span class="term">-d|--debuglevel=level</span></dt><dd><p><em class="replaceable"><code>level</code></em> is an integer
from 0 to 10. The default value if this parameter is
not specified is 0.</p><p>The higher this value, the more detail will be
logged to the log files about the activities of the
server. At level 0, only critical errors and serious
warnings will be logged. Level 1 is a reasonable level for
day-to-day running - it generates a small amount of
information about operations carried out.</p><p>Levels above 1 will generate considerable
amounts of log data, and should only be used when
investigating a problem. Levels above 3 are designed for
use only by developers and generate HUGE amounts of log
data, most of which is extremely cryptic.</p><p>Note that specifying this parameter here will
override the <a class="link" href="smb.conf.5.html#LOGLEVEL">log level</a> parameter
in the <code class="filename">smb.conf</code> file.</p></dd><dt><span class="term">-V</span></dt><dd><p>Prints the program version number.
</p></dd><dt><span class="term">-s <configuration file></span></dt><dd><p>The file specified contains the
configuration details required by the server. The
information in this file includes server-specific
information such as what printcap file to use, as well
as descriptions of all the services that the server is
to provide. See <code class="filename">smb.conf</code> for more information.
The default configuration file name is determined at
compile time.</p></dd><dt><span class="term">-l|--log-basename=logdirectory</span></dt><dd><p>Base directory name for log/debug files. The extension
<code class="constant">".progname"</code> will be appended (e.g. log.smbclient,
log.smbd, etc...). The log file is never removed by the client.
</p></dd><dt><span class="term">-h|--help</span></dt><dd><p>Print a summary of command line options.
</p></dd><dt><span class="term">-i</span></dt><dd><p>Tells <code class="literal">winbindd</code> to not
become a daemon and detach from the current terminal. This
option is used by developers when interactive debugging
of <code class="literal">winbindd</code> is required.
<code class="literal">winbindd</code> also logs to standard output,
as if the <code class="literal">-S</code> parameter had been given.
</p></dd><dt><span class="term">-n</span></dt><dd><p>Disable caching. This means winbindd will
always have to wait for a response from the domain controller
before it can respond to a client and this thus makes things
slower. The results will however be more accurate, since
results from the cache might not be up-to-date. This
might also temporarily hang winbindd if the DC doesn't respond.
</p></dd><dt><span class="term">-Y</span></dt><dd><p>Single daemon mode. This means winbindd will run
as a single process (the mode of operation in Samba 2.2). Winbindd's
default behavior is to launch a child process that is responsible for
updating expired cache entries.
</p></dd></dl></div></div><div class="refsect1" lang="en"><a name="id2478601"></a><h2>NAME AND ID RESOLUTION</h2><p>Users and groups on a Windows NT server are assigned
a security id (SID) which is globally unique when the
user or group is created. To convert the Windows NT user or group
into a unix user or group, a mapping between SIDs and unix user
and group ids is required. This is one of the jobs that <code class="literal">
winbindd</code> performs. </p><p>As winbindd users and groups are resolved from a server, user
and group ids are allocated from a specified range. This
is done on a first come, first served basis, although all existing
users and groups will be mapped as soon as a client performs a user
or group enumeration command. The allocated unix ids are stored
in a database and will be remembered. </p><p>WARNING: The SID to unix id database is the only location
where the user and group mappings are stored by winbindd. If this
store is deleted or corrupted, there is no way for winbindd to
determine which user and group ids correspond to Windows NT user
and group rids. </p><p>See the <a class="link" href="smb.conf.5.html#IDMAPDOMAINS">idmap domains</a> or the old <a class="link" href="smb.conf.5.html#IDMAPBACKEND">idmap backend</a> parameters in
<code class="filename">smb.conf</code> for options for sharing this
database, such as via LDAP.</p></div><div class="refsect1" lang="en"><a name="id2478675"></a><h2>CONFIGURATION</h2><p>Configuration of the <code class="literal">winbindd</code> daemon
is done through configuration parameters in the <a class="citerefentry" href="smb.conf.5.html"><span class="citerefentry"><span class="refentrytitle">smb.conf</span>(5)</span></a> file. All parameters should be specified in the
[global] section of smb.conf. </p><div class="itemizedlist"><ul type="disc"><li><p>
<a class="link" href="smb.conf.5.html#WINBINDSEPARATOR">winbind separator</a></p></li><li><p>
<a class="link" href="smb.conf.5.html#IDMAPUID">idmap uid</a></p></li><li><p>
<a class="link" href="smb.conf.5.html#IDMAPGID">idmap gid</a></p></li><li><p>
<a class="link" href="smb.conf.5.html#IDMAPBACKEND">idmap backend</a></p></li><li><p>
<a class="link" href="smb.conf.5.html#WINBINDCACHETIME">winbind cache time</a></p></li><li><p>
<a class="link" href="smb.conf.5.html#WINBINDENUMUSERS">winbind enum users</a></p></li><li><p>
<a class="link" href="smb.conf.5.html#WINBINDENUMGROUPS">winbind enum groups</a></p></li><li><p>
<a class="link" href="smb.conf.5.html#TEMPLATEHOMEDIR">template homedir</a></p></li><li><p>
<a class="link" href="smb.conf.5.html#TEMPLATESHELL">template shell</a></p></li><li><p>
<a class="link" href="smb.conf.5.html#WINBINDUSEDEFAULTDOMAIN">winbind use default domain</a></p></li><li><p>
<a class="link" href="smb.conf.5.html#WINBIND:RPCONLY">winbind: rpc only</a>
Setting this parameter forces winbindd to use RPC
instead of LDAP to retrieve information from Domain
Controllers.
</p></li></ul></div></div><div class="refsect1" lang="en"><a name="id2525538"></a><h2>EXAMPLE SETUP</h2><p>
To setup winbindd for user and group lookups plus
authentication from a domain controller use something like the
following setup. This was tested on an early Red Hat Linux box.
</p><p>In <code class="filename">/etc/nsswitch.conf</code> put the
following:
</p><pre class="programlisting">
passwd: files winbind
group: files winbind
</pre><p>
</p><p>In <code class="filename">/etc/pam.d/*</code> replace the <em class="parameter"><code>
auth</code></em> lines with something like this:
</p><pre class="programlisting">
auth required /lib/security/pam_securetty.so
auth required /lib/security/pam_nologin.so
auth sufficient /lib/security/pam_winbind.so
auth required /lib/security/pam_unix.so \
use_first_pass shadow nullok
</pre><p>
</p><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3><p>
The PAM module pam_unix has recently replaced the module pam_pwdb.
Some Linux systems use the module pam_unix2 in place of pam_unix.
</p></div><p>Note in particular the use of the <em class="parameter"><code>sufficient
</code></em> keyword and the <em class="parameter"><code>use_first_pass</code></em> keyword. </p><p>Now replace the account lines with this: </p><p><code class="literal">account required /lib/security/pam_winbind.so
</code></p><p>The next step is to join the domain. To do that use the
<code class="literal">net</code> program like this: </p><p><code class="literal">net join -S PDC -U Administrator</code></p><p>The username after the <em class="parameter"><code>-U</code></em> can be any
Domain user that has administrator privileges on the machine.
Substitute the name or IP of your PDC for "PDC".</p><p>Next copy <code class="filename">libnss_winbind.so</code> to
<code class="filename">/lib</code> and <code class="filename">pam_winbind.so
</code> to <code class="filename">/lib/security</code>. A symbolic link needs to be
made from <code class="filename">/lib/libnss_winbind.so</code> to
<code class="filename">/lib/libnss_winbind.so.2</code>. If you are using an
older version of glibc then the target of the link should be
<code class="filename">/lib/libnss_winbind.so.1</code>.</p><p>Finally, setup a <a class="citerefentry" href="smb.conf.5.html"><span class="citerefentry"><span class="refentrytitle">smb.conf</span>(5)</span></a> containing directives like the
following:
</p><pre class="programlisting">
[global]
winbind separator = +
winbind cache time = 10
template shell = /bin/bash
template homedir = /home/%D/%U
idmap uid = 10000-20000
idmap gid = 10000-20000
workgroup = DOMAIN
security = domain
password server = *
</pre><p>Now start winbindd and you should find that your user and
group database is expanded to include your NT users and groups,
and that you can login to your unix box as a domain user, using
the DOMAIN+user syntax for the username. You may wish to use the
commands <code class="literal">getent passwd</code> and <code class="literal">getent group
</code> to confirm the correct operation of winbindd.</p></div><div class="refsect1" lang="en"><a name="id2525746"></a><h2>NOTES</h2><p>The following notes are useful when configuring and
running <code class="literal">winbindd</code>: </p><p><a class="citerefentry" href="nmbd.8.html"><span class="citerefentry"><span class="refentrytitle">nmbd</span>(8)</span></a> must be running on the local machine
for <code class="literal">winbindd</code> to work. </p><p>PAM is really easy to misconfigure. Make sure you know what
you are doing when modifying PAM configuration files. It is possible
to set up PAM such that you can no longer log into your system. </p><p>If more than one UNIX machine is running <code class="literal">winbindd</code>,
then in general the user and groups ids allocated by winbindd will not
be the same. The user and group ids will only be valid for the local
machine, unless a shared <a class="link" href="smb.conf.5.html#IDMAPBACKEND">idmap backend</a> is configured.</p><p>If the the Windows NT SID to UNIX user and group id mapping
file is damaged or destroyed then the mappings will be lost. </p></div><div class="refsect1" lang="en"><a name="id2525817"></a><h2>SIGNALS</h2><p>The following signals can be used to manipulate the
<code class="literal">winbindd</code> daemon. </p><div class="variablelist"><dl><dt><span class="term">SIGHUP</span></dt><dd><p>Reload the <a class="citerefentry" href="smb.conf.5.html"><span class="citerefentry"><span class="refentrytitle">smb.conf</span>(5)</span></a> file and
apply any parameter changes to the running
version of winbindd. This signal also clears any cached
user and group information. The list of other domains trusted
by winbindd is also reloaded. </p></dd><dt><span class="term">SIGUSR2</span></dt><dd><p>The SIGUSR2 signal will cause <code class="literal">
winbindd</code> to write status information to the winbind
log file.</p><p>Log files are stored in the filename specified by the
log file parameter.</p></dd></dl></div></div><div class="refsect1" lang="en"><a name="id2525882"></a><h2>FILES</h2><div class="variablelist"><dl><dt><span class="term"><code class="filename">/etc/nsswitch.conf(5)</code></span></dt><dd><p>Name service switch configuration file.</p></dd><dt><span class="term">/tmp/.winbindd/pipe</span></dt><dd><p>The UNIX pipe over which clients communicate with
the <code class="literal">winbindd</code> program. For security reasons, the
winbind client will only attempt to connect to the winbindd daemon
if both the <code class="filename">/tmp/.winbindd</code> directory
and <code class="filename">/tmp/.winbindd/pipe</code> file are owned by
root. </p></dd><dt><span class="term">$LOCKDIR/winbindd_privileged/pipe</span></dt><dd><p>The UNIX pipe over which 'privileged' clients
communicate with the <code class="literal">winbindd</code> program. For security
reasons, access to some winbindd functions - like those needed by
the <code class="literal">ntlm_auth</code> utility - is restricted. By default,
only users in the 'root' group will get this access, however the administrator
may change the group permissions on $LOCKDIR/winbindd_privileged to allow
programs like 'squid' to use ntlm_auth.
Note that the winbind client will only attempt to connect to the winbindd daemon
if both the <code class="filename">$LOCKDIR/winbindd_privileged</code> directory
and <code class="filename">$LOCKDIR/winbindd_privileged/pipe</code> file are owned by
root. </p></dd><dt><span class="term">/lib/libnss_winbind.so.X</span></dt><dd><p>Implementation of name service switch library.
</p></dd><dt><span class="term">$LOCKDIR/winbindd_idmap.tdb</span></dt><dd><p>Storage for the Windows NT rid to UNIX user/group
id mapping. The lock directory is specified when Samba is initially
compiled using the <em class="parameter"><code>--with-lockdir</code></em> option.
This directory is by default <code class="filename">/usr/local/samba/var/locks
</code>. </p></dd><dt><span class="term">$LOCKDIR/winbindd_cache.tdb</span></dt><dd><p>Storage for cached user and group information.
</p></dd></dl></div></div><div class="refsect1" lang="en"><a name="id2526038"></a><h2>VERSION</h2><p>This man page is correct for version 3 of
the Samba suite.</p></div><div class="refsect1" lang="en"><a name="id2526049"></a><h2>SEE ALSO</h2><p><code class="filename">nsswitch.conf(5)</code>, <a class="citerefentry" href="samba.7.html"><span class="citerefentry"><span class="refentrytitle">samba</span>(7)</span></a>, <a class="citerefentry" href="wbinfo.1.html"><span class="citerefentry"><span class="refentrytitle">wbinfo</span>(1)</span></a>, <a class="citerefentry" href="ntlm_auth.8.html"><span class="citerefentry"><span class="refentrytitle">ntlm_auth</span>(8)</span></a>, <a class="citerefentry" href="smb.conf.5.html"><span class="citerefentry"><span class="refentrytitle">smb.conf</span>(5)</span></a>, <a class="citerefentry" href="pam_winbind.8.html"><span class="citerefentry"><span class="refentrytitle">pam_winbind</span>(8)</span></a></p></div><div class="refsect1" lang="en"><a name="id2526106"></a><h2>AUTHOR</h2><p>The original Samba software and related utilities
were created by Andrew Tridgell. Samba is now developed
by the Samba Team as an Open Source project similar
to the way the Linux kernel is developed.</p><p><code class="literal">wbinfo</code> and <code class="literal">winbindd</code> were
written by Tim Potter.</p><p>The conversion to DocBook for Samba 2.2 was done
by Gerald Carter. The conversion to DocBook XML 4.2 for
Samba 3.0 was done by Alexander Bokovoy.</p></div></div></body></html>
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