Provided by: winbind_3.0.22-1ubuntu3_i386 bug

NAME

       winbindd  -  Name  Service  Switch  daemon  for resolving names from NT
       servers

SYNOPSIS

       winbindd [-F] [-S] [-i] [-Y] [-d <debug level>] [-s <smb config file>]
                [-n]

DESCRIPTION

       This program is part of the samba(7) suite.

       winbindd  is  a  daemon  that provides a number of services to the Name
       Service Switch capability found in most modern C libraries, to arbitary
       applications via PAM and ntlm_auth and to Samba itself.

       Even  if  winbind is not used for nsswitch, it still provides a service
       to smbd, ntlm_auth and  the  pam_winbind.so  PAM  module,  by  managing
       connections  to domain controllers. In this configuraiton the idmap uid
       and idmap gid parameters are not required. (This is known as  ‘netlogon
       proxy only mode’.)

       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 /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 winbindd 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.

       The  pam_winbind  module  supports  the  auth,  account  and   password
       module-types.  It  should  be  noted  that  the  account  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 libnss_winbind library has been correctly installed, or
       an alternate source of names configured, this should always succeed.

       The  following  nsswitch  databases  are  implemented  by  the winbindd
       service:

       hosts  This  feature  is  only  available  on  IRIX.  User  information
              traditionally   stored   in   the   hosts(5)   file   and   used
              bygethostbyname(3) functions. Names  are  resolved  through  the
              WINS server or by broadcast.

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

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

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

       passwd:         files winbind
       group:          files winbind
       ## only available on IRIX; Linux users should us libnss_wins.so
       hosts:          files dns winbind

       The following simple configuration in the/etc/nsswitch.conf file can be
       used  to  initially resolve hostnames from /etc/hosts and then from the
       WINS server.

       hosts:         files wins

OPTIONS

       -F     If specified, this parameter causes the main winbindd 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  runningwinbindd  under
              process  supervisors such as supervise and svscan from Daniel J.
              Bernstein’s daemontools package, or the AIX process monitor.

       -S     If specified, this parameter causeswinbindd to log  to  standard
              output rather than a file.

       -V     Prints the program version number.

       -s <configuration file>
              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  smb.conf  for  more  information. The default
              configuration file name is determined at compile time.

       -d|--debuglevel=level
              level is an integer from 0 to 10.  The  default  value  if  this
              parameter is not specified is zero.

              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.

              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.

              Note that specifying  this  parameter  here  will  override  the
              parameter in the smb.conf file.

       -l|--logfile=logdirectory
              Base   directory   name   for  log/debug  files.  The  extension
              ".progname" will  be  appended  (e.g.  log.smbclient,  log.smbd,
              etc...). The log file is never removed by the client.

       -h|--help
              Print a summary of command line options.

       -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.winbindd also logs
              to standard output, as if the -S parameter had been given.

       -n     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.

       -Y     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.

NAME AND ID RESOLUTION

       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  winbindd performs.

       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.

       WARNING:  The  SID  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.

       See the  parameter in smb.conf for options for sharing  this  database,
       such as via LDAP.

CONFIGURATION

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

       ·  winbind separator

       ·  idmap uid

       ·  idmap gid

       ·  idmap backend

       ·  winbind cache time

       ·  winbind enum users

       ·  winbind enum groups

       ·  template homedir

       ·  template shell

       ·  winbind use default domain

EXAMPLE SETUP

       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.

       In /etc/nsswitch.conf put the following:

       passwd: files winbind
       group:  files winbind

       In /etc/pam.d/* replace the  auth lines with something like this:

       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

              Note

              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.

       Note  in  particular  the  use  of  the  sufficient   keyword  and  the
       use_first_pass keyword.

       Now replace the account lines with this:

       account required /lib/security/pam_winbind.so

       The next step is to join the domain. To do that use thenet program like
       this:

       net join -S PDC -U Administrator

       The username after the -U can be any Domain user that has administrator
       privileges on the machine. Substitute the name or IP of  your  PDC  for
       "PDC".

       Next    copy    libnss_winbind.so   to/lib   and   pam_winbind.so    to
       /lib/security.   A   symbolic   link   needs   to    be    made    from
       /lib/libnss_winbind.so  to/lib/libnss_winbind.so.2. If you are using an
       older  version  of  glibc  then  the  target   of   the   link   should
       be/lib/libnss_winbind.so.1.

       Finally, setup a smb.conf(5) containing directives like the following:

       [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 = *

       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 getent passwd
       and getent group  to confirm the correct operation of winbindd.

NOTES

       The following notes are useful when configuring and running winbindd:

       nmbd(8) must be running on the local machine for winbindd to work.

       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.

       If  more than one UNIX machine is running winbindd, 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  is configured.

       If the the Windows NT SID to UNIX user and group  id  mapping  file  is
       damaged or destroyed then the mappings will be lost.

SIGNALS

       The following signals can be used to manipulate thewinbindd daemon.

       SIGHUP Reload  the  smb.conf(5) 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.

       SIGUSR2
              The  SIGUSR2  signal  will  cause   winbindd  to  write   status
              information to the winbind log file.

              Log  files  are stored in the filename specified by the log file
              parameter.

FILES

       /etc/nsswitch.conf(5)
              Name service switch configuration file.

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

       /var/run/samba/winbindd_privileged/pipe
              The UNIX pipe over which ’privileged’ clients  communicate  with
              the  winbindd  program.  For  security  reasons,  access to some
              winbindd functions - like those needed by the ntlm_auth  utility
              - is restricted. By default, only users in the ’root’ group will
              get this access, however the administrator may change the  group
              permissions   on   /var/run/samba/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   /var/run/samba/winbindd_privileged   directory   and
              /var/run/samba/winbindd_privileged/pipe  file are owned by root.

       /lib/libnss_winbind.so.X
              Implementation of name service switch library.

       /var/run/samba/winbindd_idmap.tdb
              Storage for the Windows NT rid to UNIX user/group id mapping.

       /var/run/samba/winbindd_cache.tdb
              Storage for cached user and group information.

VERSION

       This man page is correct for version 3.0 of the Samba suite.

SEE ALSO

       nsswitch.conf(5),  samba(7),  wbinfo(1),   ntlm_auth(8),   smb.conf(5),
       pam_winbind(8)

AUTHOR

       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.

       wbinfo and winbindd were written by Tim Potter.

       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.

                                                                   WINBINDD(8)