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-<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook V4.1//EN">
-<refentry id="winbindd">
-
-<refmeta>
- <refentrytitle>winbindd</refentrytitle>
- <manvolnum>8</manvolnum>
-</refmeta>
-
-
-<refnamediv>
- <refname>winbindd</refname>
- <refpurpose>Name Service Switch daemon for resolving names
- from NT servers</refpurpose>
-</refnamediv>
-
-<refsynopsisdiv>
- <cmdsynopsis>
- <command>winbindd</command>
- <arg choice="opt">-F</arg>
- <arg choice="opt">-S</arg>
- <arg choice="opt">-i</arg>
- <arg choice="opt">-B</arg>
- <arg choice="opt">-d &lt;debug level&gt;</arg>
- <arg choice="opt">-s &lt;smb config file&gt;</arg>
- <arg choice="opt">-n</arg>
- </cmdsynopsis>
-</refsynopsisdiv>
-
-<refsect1>
- <title>DESCRIPTION</title>
-
- <para>This program is part of the <ulink url="samba.7.html">
- Samba</ulink> suite.</para>
-
- <para><command>winbindd</command> is a daemon that provides
- a service for the Name Service Switch capability that is present
- in most modern C libraries. 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 <filename>/etc/nsswitch.conf</filename> 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.</para>
-
- <para>The service provided by <command>winbindd</command> 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. </para>
-
- <para>
- The <filename>pam_winbind</filename> module in the 2.2.2 release only
- supports the <parameter>auth</parameter> and <parameter>account</parameter>
- module-types. The latter simply
- performs a getpwnam() to verify that the system can obtain a uid for the
- user. If the <filename>libnss_winbind</filename> library has been correctly
- installed, this should always succeed.
- </para>
-
- <para>The following nsswitch databases are implemented by
- the winbindd service: </para>
-
- <variablelist>
- <varlistentry>
- <term>hosts</term>
- <listitem><para>User information traditionally stored in
- the <filename>hosts(5)</filename> file and used by
- <command>gethostbyname(3)</command> functions. Names are
- resolved through the WINS server or by broadcast.
- </para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term>passwd</term>
- <listitem><para>User information traditionally stored in
- the <filename>passwd(5)</filename> file and used by
- <command>getpwent(3)</command> functions. </para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term>group</term>
- <listitem><para>Group information traditionally stored in
- the <filename>group(5)</filename> file and used by
- <command>getgrent(3)</command> functions. </para></listitem>
- </varlistentry>
- </variablelist>
-
- <para>For example, the following simple configuration in the
- <filename>/etc/nsswitch.conf</filename> file can be used to initially
- resolve user and group information from <filename>/etc/passwd
- </filename> and <filename>/etc/group</filename> and then from the
- Windows NT server. </para>
-
- <para><programlisting>
-passwd: files winbind
-group: files winbind
- </programlisting></para>
-
- <para>The following simple configuration in the
- <filename>/etc/nsswitch.conf</filename> file can be used to initially
- resolve hostnames from <filename>/etc/hosts</filename> and then from the
- WINS server.</para>
-
-</refsect1>
-
-
-<refsect1>
- <title>OPTIONS</title>
-
- <variablelist>
- <varlistentry>
- <term>-F</term>
- <listitem><para>If specified, this parameter causes
- the main <command>winbindd</command> 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
- <command>winbindd</command> under process supervisors such
- as <command>supervise</command> and <command>svscan</command>
- from Daniel J. Bernstein's <command>daemontools</command>
- package, or the AIX process monitor.
- </para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term>-S</term>
- <listitem><para>If specified, this parameter causes
- <command>winbindd</command> to log to standard output rather
- than a file.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term>-d debuglevel</term>
- <listitem><para>Sets the debuglevel to an integer between
- 0 and 100. 0 is for no debugging and 100 is for reams and
- reams. To submit a bug report to the Samba Team, use debug
- level 100 (see BUGS.txt). </para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term>-i</term>
- <listitem><para>Tells <command>winbindd</command> to not
- become a daemon and detach from the current terminal. This
- option is used by developers when interactive debugging
- of <command>winbindd</command> is required.
- <command>winbindd</command> also logs to standard output,
- as if the <command>-S</command> parameter had been given.
- </para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term>-n</term>
- <listitem><para>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.
- </para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term>-B</term>
- <listitem><para>Dual daemon mode. This means winbindd will run
- as 2 threads. 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.
- Advantage of this is that responses are accurate and fast.
- </para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term>-s|--conf=smb.conf</term>
- <listitem><para>Specifies the location of the all-important
- <filename>smb.conf</filename> file. </para></listitem>
- </varlistentry>
- </variablelist>
-</refsect1>
-
-
-<refsect1>
- <title>NAME AND ID RESOLUTION</title>
-
- <para>Users and groups on a Windows NT server are assigned
- a relative id (rid) which is unique for the domain when the
- user or group is created. To convert the Windows NT user or group
- into a unix user or group, a mapping between rids and unix user
- and group ids is required. This is one of the jobs that <command>
- winbindd</command> performs. </para>
-
- <para>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 file under the Samba lock directory and will be
- remembered. </para>
-
- <para>WARNING: The rid to unix id database is the only location
- where the user and group mappings are stored by winbindd. If this
- file 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. </para>
-</refsect1>
-
-
-<refsect1>
- <title>CONFIGURATION</title>
-
- <para>Configuration of the <command>winbindd</command> daemon
- is done through configuration parameters in the <filename>smb.conf(5)
- </filename> file. All parameters should be specified in the
- [global] section of smb.conf. </para>
-
- <itemizedlist>
- <listitem><para><ulink url="smb.conf.5.html#WINBINDSEPARATOR">
- <parameter>winbind separator</parameter></ulink></para></listitem>
- <listitem><para><ulink url="smb.conf.5.html#WINBINDUID">
- <parameter>winbind uid</parameter></ulink></para></listitem>
- <listitem><para><ulink url="smb.conf.5.html#WINBINDGID">
- <parameter>winbind gid</parameter></ulink></para></listitem>
- <listitem><para><ulink url="smb.conf.5.html#WINBINDCACHETIME">
- <parameter>winbind cache time</parameter></ulink></para></listitem>
- <listitem><para><ulink url="smb.conf.5.html#WINBINDENUMUSERS">
- <parameter>winbind enum users</parameter></ulink></para></listitem>
- <listitem><para><ulink url="smb.conf.5.html#WINBINDENUMGROUPS">
- <parameter>winbind enum groups</parameter></ulink></para></listitem>
- <listitem><para><ulink url="smb.conf.5.html#TEMPLATEHOMEDIR">
- <parameter>template homedir</parameter></ulink></para></listitem>
- <listitem><para><ulink url="smb.conf.5.html#TEMPLATESHELL">
- <parameter>template shell</parameter></ulink></para></listitem>
- <listitem><para><ulink url="smb.conf.5.html#WINBINDUSEDEFAULTDOMAIN">
- <parameter>winbind use default domain</parameter></ulink></para></listitem>
- </itemizedlist>
-</refsect1>
-
-
-<refsect1>
- <title>EXAMPLE SETUP</title>
-
- <para>To setup winbindd for user and group lookups plus
- authentication from a domain controller use something like the
- following setup. This was tested on a RedHat 6.2 Linux box. </para>
-
- <para>In <filename>/etc/nsswitch.conf</filename> put the
- following:</para>
-
- <para><programlisting>
-passwd: files winbind
-group: files winbind
- </programlisting></para>
-
- <para>In <filename>/etc/pam.d/*</filename> replace the
- <parameter>auth</parameter> lines with something like this: </para>
-
-
- <para><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_pwdb.so use_first_pass shadow nullok
- </programlisting></para>
-
-
- <para>Note in particular the use of the <parameter>sufficient</parameter>
- keyword and the <parameter>use_first_pass</parameter> keyword. </para>
-
- <para>Now replace the account lines with this: </para>
-
- <para><command>account required /lib/security/pam_winbind.so
- </command></para>
-
- <para>The next step is to join the domain. To do that use the
- <command>smbpasswd</command> program like this: </para>
-
- <para><command>smbpasswd -j DOMAIN -r PDC -U
- Administrator</command></para>
-
- <para>The username after the <parameter>-U</parameter> can be any
- Domain user that has administrator privileges on the machine.
- Substitute your domain name for "DOMAIN" and the name of your PDC
- for "PDC".</para>
-
- <para>Next copy <filename>libnss_winbind.so</filename> to
- <filename>/lib</filename> and <filename>pam_winbind.so</filename>
- to <filename>/lib/security</filename>. A symbolic link needs to be
- made from <filename>/lib/libnss_winbind.so</filename> to
- <filename>/lib/libnss_winbind.so.2</filename>. If you are using an
- older version of glibc then the target of the link should be
- <filename>/lib/libnss_winbind.so.1</filename>.</para>
-
- <para>Finally, setup a <filename>smb.conf</filename> containing directives like the
- following: </para>
-
- <para><programlisting>
-[global]
- winbind separator = +
- winbind cache time = 10
- template shell = /bin/bash
- template homedir = /home/%D/%U
- winbind uid = 10000-20000
- winbind gid = 10000-20000
- workgroup = DOMAIN
- security = domain
- password server = *
- </programlisting></para>
-
-
- <para>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 <command>getent passwd</command> and <command>getent group
- </command> to confirm the correct operation of winbindd.</para>
-</refsect1>
-
-
-<refsect1>
- <title>NOTES</title>
-
- <para>The following notes are useful when configuring and
- running <command>winbindd</command>: </para>
-
- <para><command>nmbd</command> must be running on the local machine
- for <command>winbindd</command> to work. <command>winbindd</command>
- queries the list of trusted domains for the Windows NT server
- on startup and when a SIGHUP is received. Thus, for a running <command>
- winbindd</command> to become aware of new trust relationships between
- servers, it must be sent a SIGHUP signal. </para>
-
- <para>Client processes resolving names through the <command>winbindd</command>
- nsswitch module read an environment variable named <envar>
- $WINBINDD_DOMAIN</envar>. If this variable contains a comma separated
- list of Windows NT domain names, then winbindd will only resolve users
- and groups within those Windows NT domains. </para>
-
- <para>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. </para>
-
- <para>If more than one UNIX machine is running <command>winbindd</command>,
- 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.</para>
-
- <para>If the the Windows NT RID to UNIX user and group id mapping
- file is damaged or destroyed then the mappings will be lost. </para>
-</refsect1>
-
-
-<refsect1>
- <title>SIGNALS</title>
-
- <para>The following signals can be used to manipulate the
- <command>winbindd</command> daemon. </para>
-
- <variablelist>
- <varlistentry>
- <term>SIGHUP</term>
- <listitem><para>Reload the <filename>smb.conf(5)</filename>
- 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. </para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term>SIGUSR1</term>
- <listitem><para>The SIGUSR1 signal will cause <command>
- winbindd</command> to write status information to the winbind
- log file including information about the number of user and
- group ids allocated by <command>winbindd</command>.</para>
-
- <para>Log files are stored in the filename specified by the
- log file parameter.</para></listitem>
- </varlistentry>
- </variablelist>
-</refsect1>
-
-<refsect1>
- <title>FILES</title>
-
- <variablelist>
- <varlistentry>
- <term><filename>/etc/nsswitch.conf(5)</filename></term>
- <listitem><para>Name service switch configuration file.</para>
- </listitem>
- </varlistentry>
-
- <varlistentry>
- <term>/tmp/.winbindd/pipe</term>
- <listitem><para>The UNIX pipe over which clients communicate with
- the <command>winbindd</command> program. For security reasons, the
- winbind client will only attempt to connect to the winbindd daemon
- if both the <filename>/tmp/.winbindd</filename> directory
- and <filename>/tmp/.winbindd/pipe</filename> file are owned by
- root. </para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term>/lib/libnss_winbind.so.X</term>
- <listitem><para>Implementation of name service switch library.
- </para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term>$LOCKDIR/winbindd_idmap.tdb</term>
- <listitem><para>Storage for the Windows NT rid to UNIX user/group
- id mapping. The lock directory is specified when Samba is initially
- compiled using the <parameter>--with-lockdir</parameter> option.
- This directory is by default <filename>/usr/local/samba/var/locks
- </filename>. </para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term>$LOCKDIR/winbindd_cache.tdb</term>
- <listitem><para>Storage for cached user and group information.
- </para></listitem>
- </varlistentry>
- </variablelist>
-</refsect1>
-
-
-<refsect1>
- <title>VERSION</title>
-
- <para>This man page is correct for version 3.0 of
- the Samba suite.</para>
-</refsect1>
-
-<refsect1>
- <title>SEE ALSO</title>
-
- <para><filename>nsswitch.conf(5)</filename>,
- <ulink url="samba.7.html">samba(7)</ulink>,
- <ulink url="wbinfo.1.html">wbinfo(1)</ulink>,
- <ulink url="smb.conf.5.html">smb.conf(5)</ulink></para>
-</refsect1>
-
-<refsect1>
- <title>AUTHOR</title>
-
- <para>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.</para>
-
- <para><command>wbinfo</command> and <command>winbindd</command>
- were written by Tim Potter.</para>
-
- <para>The conversion to DocBook for Samba 2.2 was done
- by Gerald Carter</para>
-</refsect1>
-
-</refentry>