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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 V1.75.2"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry" title="winbindd"><a name="winbindd.8"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>winbindd &#8212; Name Service Switch daemon for resolving names
- from NT servers</p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><div class="cmdsynopsis"><p><code class="literal">winbindd</code> [-D] [-F] [-S] [-i] [-Y] [-d &lt;debug level&gt;] [-s &lt;smb config file&gt;] [-n]</p></div></div><div class="refsect1" title="DESCRIPTION"><a name="id266856"></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 configuration the
- <a class="link" href="smb.conf.5.html#IDMAPCONFIG*:RANGE" target="_top">idmap config * : range</a>
- parameter is 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
- through 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">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" title="OPTIONS"><a name="id307067"></a><h2>OPTIONS</h2><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">-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#" target="_top"></a> parameter
-in the <code class="filename">smb.conf</code> file.</p></dd><dt><span class="term">-V|--version</span></dt><dd><p>Prints the program version number.
-</p></dd><dt><span class="term">-s|--configfile &lt;configuration file&gt;</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" title="NAME AND ID RESOLUTION"><a name="id307306"></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></div><div class="refsect1" title="CONFIGURATION"><a name="id307336"></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 class="itemizedlist" type="disc"><li class="listitem"><p>
- <a class="link" href="smb.conf.5.html#WINBINDSEPARATOR" target="_top">winbind separator</a></p></li><li class="listitem"><p>
- <a class="link" href="smb.conf.5.html#IDMAPCONFIG*:RANGE" target="_top">idmap config * : range</a></p></li><li class="listitem"><p>
- <a class="link" href="smb.conf.5.html#IDMAPCONFIG*:BACKEND" target="_top">idmap config * : backend</a></p></li><li class="listitem"><p>
- <a class="link" href="smb.conf.5.html#WINBINDCACHETIME" target="_top">winbind cache time</a></p></li><li class="listitem"><p>
- <a class="link" href="smb.conf.5.html#WINBINDENUMUSERS" target="_top">winbind enum users</a></p></li><li class="listitem"><p>
- <a class="link" href="smb.conf.5.html#WINBINDENUMGROUPS" target="_top">winbind enum groups</a></p></li><li class="listitem"><p>
- <a class="link" href="smb.conf.5.html#TEMPLATEHOMEDIR" target="_top">template homedir</a></p></li><li class="listitem"><p>
- <a class="link" href="smb.conf.5.html#TEMPLATESHELL" target="_top">template shell</a></p></li><li class="listitem"><p>
- <a class="link" href="smb.conf.5.html#WINBINDUSEDEFAULTDOMAIN" target="_top">winbind use default domain</a></p></li><li class="listitem"><p>
- <a class="link" href="smb.conf.5.html#WINBIND:RPCONLY" target="_top">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" title="EXAMPLE SETUP"><a name="id307470"></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" title="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 config * : range = 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" title="NOTES"><a name="id307642"></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#IDMAPCONFIG*:BACKEND" target="_top">idmap config * : 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" title="SIGNALS"><a name="id307698"></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" title="FILES"><a name="id307756"></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" title="VERSION"><a name="id307888"></a><h2>VERSION</h2><p>This man page is correct for version 3 of
- the Samba suite.</p></div><div class="refsect1" title="SEE ALSO"><a name="id307898"></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" title="AUTHOR"><a name="id307953"></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>