mailto(samba-bugs@samba.org)
manpage(winbindd htmlcommand((1)))(1)(8 May 2000)(Samba)(SAMBA)

label(NAME)
manpagename(winbindd)(Name Service Switch daemon for resolving names from NT servers)

label(SYNOPSIS)
manpagesynopsis() 

bf(winbindd) [link(-d debuglevel)(minusd)] [link(-i)(minusi)]

label(DESCRIPTION)
manpagedescription()

This program is part of the bf(Samba) suite version 3.0 and describes
functionality not yet implemented in the main version of Samba.

bf(winbindd) 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(/etc/nsswitch.conf) 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.  

The service provided by bf(winbindd) is called `winbind' and can be used to
resolve user and group information from a Windows NT server.  

The following nsswitch databases are implemented by the bf(winbindd)
service:

startdit()

dit(passwd)

User information traditionally stored in the bf(passwd(5)) file and used by
bf(getpwent(3)) functions.

dit(group)

Group information traditionally stored in the bf(group(5)) file and used by
bf(getgrent(3)) functions.

enddit()

For example, the following simple configuration in the
tt(/etc/nsswitch.conf) file can be used to initially resolve user and group
information from tt(/etc/passwd) and tt(/etc/group) and then from the
Windows NT server.

tt(passwd:         files winbind)

tt(group:          files winbind)

label(OPTIONS)
manpageoptions()

The following options are available to the bf(winbindd) daemon:

startdit()

label(minusd)
dit(bf(-d debuglevel))
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 bf(BUGS.txt)).  

label(minusi)
dit(bf(-i))
Tells winbindd to not become a daemon and detach from the current terminal.
This option is used by developers when interactive debugging of winbindd is
required.

enddit()

label(NAMEANDIDRESOLUTION)
manpagesection(NAME AND ID RESOLUTION)

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 bf(winbindd) performs.

As bf(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.

WARNING: The rid to unix id database is the only location where the user
and group mappings are stored by bf(winbindd).  If this file is deleted or
corrupted, there is no way for bf(winbindd) to determine which user and
group ids correspond to Windows NT user and group rids.

label(CONFIGURATION)
manpagesection(CONFIGURATION)

Configuration of the bf(winbindd) daemon is done through configuration
parameters in the url(bf(smb.conf))(smb.conf.5.html) file.  All parameters
should be specified in the [global] section of
url(bf(smb.conf))(smb.conf.5.html).

startdit()

dit(winbind uid)

The winbind uid parameter specifies the range of user ids that are
allocated by the url(bf(winbindd))(winbindd.8.html) daemon.  This range of
ids should have no existing local or nis users within it as strange
conflicts can occur otherwise.

  bf(Default:)
tt(     winbind uid = <empty string>)

  bf(Example:)
tt(     winbind uid = 10000-20000)

dit(winbind gid)

The winbind gid parameter specifies the range of group ids that are
allocated by the url(bf(winbindd))(winbindd.8.html) daemon.  This range of
group ids should have no existing local or nis groups within it as strange
conflicts can occur otherwise.

  bf(Default:)
tt(     winbind gid = <empty string>)

  bf(Example:)
tt(     winbind gid = 10000-20000)

dit(winbind cache time)

This parameter specifies the number of seconds the
url(bf(winbindd))(winbindd.8.html) daemon will cache user and group
information before querying a Windows NT server again.

  bf(Default:)
tt(     winbind cache type = 15)

dit(template homedir)

When filling out the user information for a Windows NT user, the
url(bf(winbindd))(winbindd.8.html) daemon uses this parameter to fill in
the home directory for that user.  If the string tt(%D) is present it is
substituted with the user's Windows NT domain name.  If the string tt(%U)
is present it is substituted with the user's Windows NT user name.

  bf(Default:)
tt(     template homedir = /home/%D/%U)

dit(template shell)

When filling out the user information for a Windows NT user, the
url(bf(winbindd))(winbindd.8.html) daemon uses this parameter to fill in
the home directory for that user.  If the string tt(%D) is present it is
substituted with the user's Windows NT domain name.  If the string tt(%U)
is present it is substituted with the user's Windows NT user name.

  bf(Default:)
tt(     template homedir = /home/%D/%U)

enddit()

label(FILES)
manpagefiles()

The following files are relevant to the operation of the bf(winbindd)
daemon.

startdit()

dit(/etc/nsswitch.conf(5))

Name service switch configuration file.

dit(/tmp/.winbindd/pipe)

The UNIX pipe over which clients communicate with the bf(winbindd) program.
For security reasons, the winbind client will only attempt to connect to the
bf(winbindd) daemon if both the tt(/tmp/.winbindd) directory and
tt(/tmp/.winbindd/pipe) file are owned by root.

dit(/lib/libnss_winbind.so.X)

Implementation of name service switch library. 

dit($LOCKDIR/winbindd_idmap.tdb)

Storage for the Windows NT rid to UNIX user/group id mapping.  If this file
is damaged or destroyed then the mappings will be lost.

The lock directory is specified when Samba is initially compiled using the
tt(--with-lockdir) option.  This directory is by default
tt(/usr/local/samba/var/locks).

dit($LOCKDIR/winbindd_cache.tdb)

Storage for cached user and group information.

enddit()

label(SEEALSO)
manpageseealso()

url(bf(samba(7)))(samba.7.html), url(bf(smb.conf(5)))(smb.conf.5.html), 
bf(nsswitch.conf(5))

label(AUTHOR)
manpageauthor()

The original Samba software and related utilities were created by
Andrew Tridgell email(samba-bugs@samba.org). Samba is now developed
by the Samba Team as an Open Source project similar to the way the
Linux kernel is developed.

Winbindd was written by Tim Potter.