Provided by: winbind_3.0.28a-1ubuntu4_i386 bug

NAME

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

SYNOPSIS

       winbindd [-F] [-S] [-i] [-Y] [-d<debuglevel>] [-s<smbconfigfile>] [-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   by
          gethostbyname(3)  functions.  Names  are  resolved  through the WINS
          server or by broadcast.

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

       group
          Group information traditionally stored in the group(5) file and used
          by getgrent(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  running  winbindd  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  causes  winbindd 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  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  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.

       See the

       or the old

       parameters 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

       ·   winbind: rpc only Setting this parameter forces winbindd to use RPC
          instead of LDAP to retrieve information from Domain Controllers.

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  the  net  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 the winbindd 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)