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<HTML
><HEAD
><TITLE
>winbindd</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.57"></HEAD
><BODY
CLASS="REFENTRY"
BGCOLOR="#FFFFFF"
TEXT="#000000"
LINK="#0000FF"
VLINK="#840084"
ALINK="#0000FF"
><H1
><A
NAME="WINBINDD"
>winbindd</A
></H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN5"
></A
><H2
>Name</H2
>winbindd&nbsp;--&nbsp;Name Service Switch daemon for resolving names 
	from NT servers</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN8"
></A
><H2
>Synopsis</H2
><P
><B
CLASS="COMMAND"
>winbindd</B
>  [-i] [-d &#60;debug level&#62;] [-s &#60;smb config file&#62;]</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN14"
></A
><H2
>DESCRIPTION</H2
><P
>This program is part of the <A
HREF="samba.7.html"
TARGET="_top"
>	Samba</A
> suite.</P
><P
><B
CLASS="COMMAND"
>winbindd</B
> 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 <TT
CLASS="FILENAME"
>/etc/nsswitch.conf</TT
> 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 <B
CLASS="COMMAND"
>winbindd</B
> 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 <TT
CLASS="FILENAME"
>pam_winbind</TT
> module in the 2.2.2 release only 
	supports the <TT
CLASS="PARAMETER"
><I
>auth</I
></TT
> and <TT
CLASS="PARAMETER"
><I
>account</I
></TT
> 
	module-types.  The latter is simply
	performs a getpwnam() to verify that the system can obtain a uid for the
	user.  If the <TT
CLASS="FILENAME"
>libnss_winbind</TT
> library has been correctly 
	installed, this should always suceed.
	</P
><P
>The following nsswitch databases are implemented by 
	the winbindd service: </P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>hosts</DT
><DD
><P
>User information traditionally stored in 
		the <TT
CLASS="FILENAME"
>hosts(5)</TT
> file and used by 
		<B
CLASS="COMMAND"
>gethostbyname(3)</B
> functions. Names are
		resolved through the WINS server or by broadcast.
		</P
></DD
><DT
>passwd</DT
><DD
><P
>User information traditionally stored in 
		the <TT
CLASS="FILENAME"
>passwd(5)</TT
> file and used by 
		<B
CLASS="COMMAND"
>getpwent(3)</B
> functions. </P
></DD
><DT
>group</DT
><DD
><P
>Group information traditionally stored in 
		the <TT
CLASS="FILENAME"
>group(5)</TT
> file and used by 		
		<B
CLASS="COMMAND"
>getgrent(3)</B
> functions. </P
></DD
></DL
></DIV
><P
>For example, the following simple configuration in the
	<TT
CLASS="FILENAME"
>/etc/nsswitch.conf</TT
> file can be used to initially 
	resolve user and group information from <TT
CLASS="FILENAME"
>/etc/passwd
	</TT
> and <TT
CLASS="FILENAME"
>/etc/group</TT
> and then from the 
	Windows NT server. </P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>passwd:         files winbind
group:          files winbind
	</PRE
></TD
></TR
></TABLE
></P
><P
>The following simple configuration in the
	<TT
CLASS="FILENAME"
>/etc/nsswitch.conf</TT
> file can be used to initially
	resolve hostnames from <TT
CLASS="FILENAME"
>/etc/hosts</TT
> and then from the
	WINS server.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN57"
></A
><H2
>OPTIONS</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>-d debuglevel</DT
><DD
><P
>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).   </P
></DD
><DT
>-i</DT
><DD
><P
>Tells <B
CLASS="COMMAND"
>winbindd</B
> to not 
		become a daemon and detach from the current terminal. This 
		option is used by developers when interactive debugging 
		of <B
CLASS="COMMAND"
>winbindd</B
> is required. </P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN70"
></A
><H2
>NAME AND ID RESOLUTION</H2
><P
>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 <B
CLASS="COMMAND"
>	winbindd</B
> 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 file under the Samba lock directory and will be 
	remembered. </P
><P
>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. </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN76"
></A
><H2
>CONFIGURATION</H2
><P
>Configuration of the <B
CLASS="COMMAND"
>winbindd</B
> daemon 
	is done through configuration parameters in the <TT
CLASS="FILENAME"
>smb.conf(5)
	</TT
> file.  All parameters should be specified in the 
	[global] section of smb.conf. </P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>winbind separator</DT
><DD
><P
>The winbind separator option allows you 
		to specify how NT domain names and user names are combined 
		into unix user names when presented to users. By default, 
		<B
CLASS="COMMAND"
>winbindd</B
> will use the traditional '\' 
		separator so that the unix user names look like 
		DOMAIN\username. In some cases this separator character may 
		cause problems as the '\' character has special meaning in 
		unix shells.  In that case you can use the winbind separator 
		option to specify an alternative separator character. Good 
		alternatives may be '/' (although that conflicts
		with the unix directory separator) or a '+ 'character. 
		The '+' character appears to be the best choice for 100% 
		compatibility with existing unix utilities, but may be an 
		aesthetically bad choice depending on your taste. </P
><P
>Default: <B
CLASS="COMMAND"
>winbind separator = \ </B
>
		</P
><P
>Example: <B
CLASS="COMMAND"
>winbind separator = + </B
></P
></DD
><DT
>winbind uid</DT
><DD
><P
>The winbind uid parameter specifies the 
		range of user ids that are allocated by the winbindd daemon.  
		This range of ids should have no existing local or NIS users 
		within it as strange conflicts can occur otherwise. </P
><P
>Default: <B
CLASS="COMMAND"
>winbind uid = &#60;empty string&#62; 
		</B
></P
><P
>Example: <B
CLASS="COMMAND"
>winbind uid = 10000-20000</B
></P
></DD
><DT
>winbind gid</DT
><DD
><P
>The winbind gid parameter specifies the 
		range of group ids that are allocated by the winbindd daemon.  
		This range of group ids should have no existing local or NIS 
		groups within it as strange conflicts can occur otherwise.</P
><P
>Default: <B
CLASS="COMMAND"
>winbind gid = &#60;empty string&#62;
		</B
></P
><P
>Example: <B
CLASS="COMMAND"
>winbind gid = 10000-20000
		</B
> </P
></DD
><DT
>winbind cache time</DT
><DD
><P
>This parameter specifies the number of 
		seconds the winbindd daemon will cache user and group information 
		before querying a Windows NT server again. When a item in the 
		cache is older than this time winbindd will ask the domain 
		controller for the sequence number of the server's account database. 
		If the sequence number has not changed then the cached item is 
		marked as valid for a further <TT
CLASS="PARAMETER"
><I
>winbind cache time
		</I
></TT
> seconds.  Otherwise the item is fetched from the 
		server. This means that as long as the account database is not 
		actively changing winbindd will only have to send one sequence 
		number query packet every <TT
CLASS="PARAMETER"
><I
>winbind cache time
		</I
></TT
> seconds. </P
><P
>Default: <B
CLASS="COMMAND"
>winbind cache time = 15</B
>
		</P
></DD
><DT
>winbind enum users</DT
><DD
><P
>On large installations it may be necessary 
		to suppress the enumeration of users through the <B
CLASS="COMMAND"
>		setpwent()</B
>, <B
CLASS="COMMAND"
>getpwent()</B
> and 
		<B
CLASS="COMMAND"
>endpwent()</B
> group of system calls.  If 
		the <TT
CLASS="PARAMETER"
><I
>winbind enum users</I
></TT
> parameter is false, 
		calls to the <B
CLASS="COMMAND"
>getpwent</B
> system call will not 
		return any data. </P
><P
><EM
>Warning:</EM
> Turning off user enumeration 
		may cause some programs to behave oddly.  For example, the <B
CLASS="COMMAND"
>finger</B
> 
		program relies on having access to the full user list when 
		searching  for matching usernames. </P
><P
>Default: <B
CLASS="COMMAND"
>winbind enum users = yes </B
></P
></DD
><DT
>winbind enum groups</DT
><DD
><P
>On large installations it may be necessary 
		to suppress the enumeration of groups through the <B
CLASS="COMMAND"
>		setgrent()</B
>, <B
CLASS="COMMAND"
>getgrent()</B
> and 
		<B
CLASS="COMMAND"
>endgrent()</B
> group of system calls.  If 
		the <TT
CLASS="PARAMETER"
><I
>winbind enum groups</I
></TT
> parameter is 
		false, calls to the <B
CLASS="COMMAND"
>getgrent()</B
> system 
		call will not return any data. </P
><P
><EM
>Warning:</EM
> Turning off group 
		enumeration may cause some programs to behave oddly. 
		</P
><P
>Default: <B
CLASS="COMMAND"
>winbind enum groups = no </B
>
		</P
></DD
><DT
>template homedir</DT
><DD
><P
>When filling out the user information 
		for a Windows NT user, the <B
CLASS="COMMAND"
>winbindd</B
> daemon 
		uses this parameter to fill in the home directory for that user.  
		If the string <TT
CLASS="PARAMETER"
><I
>%D</I
></TT
> is present it is 
		substituted with the user's Windows NT domain name.  If the 
		string <TT
CLASS="PARAMETER"
><I
>%U</I
></TT
> is present it is substituted
		with the user's Windows NT user name. </P
><P
>Default: <B
CLASS="COMMAND"
>template homedir = /home/%D/%U </B
>
		</P
></DD
><DT
>template shell</DT
><DD
><P
>When filling out the user information for 
 		a Windows NT user, the <B
CLASS="COMMAND"
>winbindd</B
> daemon 
		uses this parameter to fill in the shell for that user. 
		</P
><P
>Default: <B
CLASS="COMMAND"
>template shell = /bin/false </B
>
		</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN158"
></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 a RedHat 6.2 Linux box. </P
><P
>In <TT
CLASS="FILENAME"
>/etc/nsswitch.conf</TT
> put the 
	following:</P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>passwd:     files winbind
group:      files winbind
	</PRE
></TD
></TR
></TABLE
></P
><P
>In <TT
CLASS="FILENAME"
>/etc/pam.d/*</TT
> replace the 
	<TT
CLASS="PARAMETER"
><I
>auth</I
></TT
> lines with something like this: </P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><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_pwdb.so use_first_pass shadow nullok
	</PRE
></TD
></TR
></TABLE
></P
><P
>Note in particular the use of the <TT
CLASS="PARAMETER"
><I
>sufficient</I
></TT
> 
	keyword and the <TT
CLASS="PARAMETER"
><I
>use_first_pass</I
></TT
> keyword. </P
><P
>Now replace the account lines with this: </P
><P
><B
CLASS="COMMAND"
>account    required	/lib/security/pam_winbind.so
	</B
></P
><P
>The next step is to join the domain. To do that use the 
	<B
CLASS="COMMAND"
>smbpasswd</B
> program like this:  </P
><P
><B
CLASS="COMMAND"
>smbpasswd -j DOMAIN -r PDC -U
	Administrator</B
></P
><P
>The username after the <TT
CLASS="PARAMETER"
><I
>-U</I
></TT
> 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".</P
><P
>Next copy <TT
CLASS="FILENAME"
>libnss_winbind.so</TT
> to 
	<TT
CLASS="FILENAME"
>/lib</TT
> and <TT
CLASS="FILENAME"
>pam_winbind.so</TT
>
	to <TT
CLASS="FILENAME"
>/lib/security</TT
>.  A symbolic link needs to be
	made from <TT
CLASS="FILENAME"
>/lib/libnss_winbind.so</TT
> to
	<TT
CLASS="FILENAME"
>/lib/libnss_winbind.so.2</TT
>.  If you are using an
	older version of glibc then the target of the link should be
	<TT
CLASS="FILENAME"
>/lib/libnss_winbind.so.1</TT
>.</P
><P
>Finally, setup a <TT
CLASS="FILENAME"
>smb.conf</TT
> containing directives like the 
	following:  </P
><P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="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 = *
	</PRE
></TD
></TR
></TABLE
></P
><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 <B
CLASS="COMMAND"
>getent passwd</B
> and <B
CLASS="COMMAND"
>getent group
	</B
> to confirm the correct operation of winbindd.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN197"
></A
><H2
>NOTES</H2
><P
>The following notes are useful when configuring and 
	running <B
CLASS="COMMAND"
>winbindd</B
>: </P
><P
><B
CLASS="COMMAND"
>nmbd</B
> must be running on the local machine 
	for <B
CLASS="COMMAND"
>winbindd</B
> to work. <B
CLASS="COMMAND"
>winbindd</B
>
	queries the list of trusted domains for the Windows NT server
	on startup and when a SIGHUP is received.  Thus, for a running <B
CLASS="COMMAND"
>	winbindd</B
> to become aware of new trust relationships between 
	servers, it must be sent a SIGHUP signal. </P
><P
>Client processes resolving names through the <B
CLASS="COMMAND"
>winbindd</B
>
	nsswitch module read an environment variable named <TT
CLASS="ENVAR"
>	$WINBINDD_DOMAIN</TT
>.  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. </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 <B
CLASS="COMMAND"
>winbindd</B
>, 
	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.</P
><P
>If the the Windows NT RID to UNIX user and group id mapping 
	file is damaged or destroyed then the mappings will be lost. </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN213"
></A
><H2
>SIGNALS</H2
><P
>The following signals can be used to manipulate the 
	<B
CLASS="COMMAND"
>winbindd</B
> daemon. </P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>SIGHUP</DT
><DD
><P
>Reload the <TT
CLASS="FILENAME"
>smb.conf(5)</TT
>
		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
>SIGUSR1</DT
><DD
><P
>The SIGUSR1 signal will cause <B
CLASS="COMMAND"
>		winbindd</B
> to write status information to the winbind 
		log file including information about the number of user and 
		group ids allocated by <B
CLASS="COMMAND"
>winbindd</B
>.</P
><P
>Log files are stored in the filename specified by the 
		log file parameter.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN230"
></A
><H2
>FILES</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="FILENAME"
>/etc/nsswitch.conf(5)</TT
></DT
><DD
><P
>Name service switch configuration file.</P
></DD
><DT
>/tmp/.winbindd/pipe</DT
><DD
><P
>The UNIX pipe over which clients communicate with 
		the <B
CLASS="COMMAND"
>winbindd</B
> program.  For security reasons, the 
		winbind client will only attempt to connect to the winbindd daemon 
		if both the <TT
CLASS="FILENAME"
>/tmp/.winbindd</TT
> directory
		and <TT
CLASS="FILENAME"
>/tmp/.winbindd/pipe</TT
> file are owned by 
		root. </P
></DD
><DT
>/lib/libnss_winbind.so.X</DT
><DD
><P
>Implementation of name service switch library.
		</P
></DD
><DT
>$LOCKDIR/winbindd_idmap.tdb</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 <TT
CLASS="PARAMETER"
><I
>--with-lockdir</I
></TT
> option.
		This directory is by default <TT
CLASS="FILENAME"
>/usr/local/samba/var/locks
		</TT
>. </P
></DD
><DT
>$LOCKDIR/winbindd_cache.tdb</DT
><DD
><P
>Storage for cached user and group information.
		</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN259"
></A
><H2
>VERSION</H2
><P
>This man page is correct for version 2.2 of
        the Samba suite.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN262"
></A
><H2
>SEE ALSO</H2
><P
><TT
CLASS="FILENAME"
>nsswitch.conf(5)</TT
>,
	<A
HREF="samba.7.html"
TARGET="_top"
>samba(7)</A
>,
	<A
HREF="wbinfo.1.html"
TARGET="_top"
>wbinfo(1)</A
>,
	<A
HREF="smb.conf.5.html"
TARGET="_top"
>smb.conf(5)</A
></P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN269"
></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
><B
CLASS="COMMAND"
>wbinfo</B
> and <B
CLASS="COMMAND"
>winbindd</B
>
	were written by Tim Potter.</P
><P
>The conversion to DocBook for Samba 2.2 was done 
	by Gerald Carter</P
></DIV
></BODY
></HTML
>