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smbpasswd(8)                                                      smbpasswd(8)




NAME

       smbpasswd - change a user's SMB password


SYNOPSIS

       smbpasswd  [-a]  [-c <config file>] [-x] [-d] [-e] [-D debuglevel] [-n]
        [-r <remote machine>]   [-R <name resolve order>]    [-m]    [-U user-
        name[%password]] [-h] [-s] [-w pass] [-W] [-i] [-L] [username]


DESCRIPTION

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

       The  smbpasswd  program  has  several different functions, depending on
       whether it is run by the root user or not. When run as a normal user it
       allows  the  user to change the password used for their SMB sessions on
       any machines that store SMB passwords.

       By default (when run with no arguments) it will attempt to  change  the
       current  user's  SMB  password on the local machine. This is similar to
       the way the passwd(1) program works.  smbpasswd differs  from  how  the
       passwd program works however in that it is not setuid root but works in
       a client-server mode and communicates with a locally  running  smbd(8).
       As  a  consequence in order for this to succeed the smbd daemon must be
       running on the local machine. On a UNIX machine the encrypted SMB pass-
       words are usually stored in the smbpasswd(5) file.

       When  run  by  an  ordinary user with no options, smbpasswd will prompt
       them for their old SMB password and then ask them for their  new  pass-
       word  twice,  to  ensure  that the new password was typed correctly. No
       passwords will be echoed on the screen whilst being typed. If you  have
       a blank SMB password (specified by the string "NO PASSWORD" in the smb-
       passwd file) then just press the <Enter> key when asked  for  your  old
       password.

       smbpasswd  can  also be used by a normal user to change their SMB pass-
       word on remote machines, such as Windows NT Primary Domain Controllers.
       See the (-r) and -U options below.

       When run by root, smbpasswd allows new users to be added and deleted in
       the smbpasswd file, as well as allows changes to the attributes of  the
       user  in this file to be made. When run by root, smbpasswd accesses the
       local smbpasswd file directly, thus enabling changes to be made even if
       smbd is not running.


OPTIONS

       -a
          This option specifies that the username following should be added to
          the local smbpasswd file, with the new password typed (type  <Enter>
          for  the  old password). This option is ignored if the username fol-
          lowing already exists in the smbpasswd file and it is treated like a
          regular  change password command. Note that the default passdb back-
          ends require the user to already exist in the system  password  file
          (usually /etc/passwd), else the request to add the user will fail.

          This option is only available when running smbpasswd as root.

       -c
          This  option  can  be  used to specify the path and file name of the
          smb.conf configuration file when it is important to use  other  than
          the default file and / or location.

       -x
          This  option specifies that the username following should be deleted
          from the local smbpasswd file.

          This option is only available when running smbpasswd as root.

       -d
          This option specifies that the username following should be disabled
          in the local smbpasswd file. This is done by writing a 'D' flag into
          the account control space in the smbpasswd file. Once this  is  done
          all  attempts to authenticate via SMB using this username will fail.

          If the smbpasswd file is in the 'old' format (pre-Samba 2.0  format)
          there  is no space in the user's password entry to write this infor-
          mation and the command will FAIL. See smbpasswd(5)  for  details  on
          the 'old' and new password file formats.

          This option is only available when running smbpasswd as root.

       -e
          This  option specifies that the username following should be enabled
          in the local smbpasswd file, if the account was previously disabled.
          If  the account was not disabled this option has no effect. Once the
          account is enabled then the user will be able  to  authenticate  via
          SMB once again.

          If  the  smbpasswd  file is in the 'old' format, then smbpasswd will
          FAIL to enable the account. See  smbpasswd(5)  for  details  on  the
          'old' and new password file formats.

          This option is only available when running smbpasswd as root.

       -D debuglevel
          debuglevel  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 smbpasswd. At level 0, only critical
          errors and serious warnings will be logged.

          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.

       -n
          This  option specifies that the username following should have their
          password set to null (i.e. a blank password) in the local  smbpasswd
          file.  This is done by writing the string "NO PASSWORD" as the first
          part of the first password stored in the smbpasswd file.

          Note that to allow users to logon to a Samba server once  the  pass-
          word  has been set to "NO PASSWORD" in the smbpasswd file the admin-
          istrator must set the following parameter in the [global] section of
          the smb.conf file :

          null passwords = yes

          This option is only available when running smbpasswd as root.

       -r remote machine name
          This  option  allows  a  user  to  specify what machine they wish to
          change their password on. Without this parameter smbpasswd  defaults
          to  the  local  host. The remote machine name is the NetBIOS name of
          the SMB/CIFS server to contact to attempt the password change.  This
          name  is resolved into an IP address using the standard name resolu-
          tion mechanism in all programs of the Samba suite. See the  -R  name
          resolve order parameter for details on changing this resolving mech-
          anism.

          The username whose password is changed is that of the  current  UNIX
          logged  on user. See the -U username parameter for details on chang-
          ing the password for a different username.

          Note that if changing  a  Windows  NT  Domain  password  the  remote
          machine  specified  must  be  the  Primary Domain Controller for the
          domain (Backup Domain Controllers only have a read-only copy of  the
          user account database and will not allow the password change).

          Note  that  Windows 95/98 do not have a real password database so it
          is not possible to change passwords specifying a Win95/98 machine as
          remote machine target.

       -R name resolve order
          This option allows the user of smbpasswd to determine what name res-
          olution services to use when looking up the NetBIOS name of the host
          being connected to.

          The  options  are :"lmhosts", "host", "wins" and "bcast". They cause
          names to be resolved as follows:

             o  lmhosts: Lookup an IP address in the Samba  lmhosts  file.  If
                the  line  in lmhosts has no name type attached to the NetBIOS
                name (see the lmhosts(5)  for  details)  then  any  name  type
                matches for lookup.

             o  host:  Do a standard host name to IP address resolution, using
                the system /etc/hosts , NIS, or DNS lookups.  This  method  of
                name  resolution  is operating system depended for instance on
                IRIX or Solaris  this  may  be  controlled  by  the  /etc/nss-
                witch.conf  file).  Note  that this method is only used if the
                NetBIOS name type being queried  is  the  0x20  (server)  name
                type, otherwise it is ignored.

             o  wins:  Query  a  name  with  the IP address listed in the wins
                server parameter. If no WINS server has  been  specified  this
                method will be ignored.

             o  bcast:  Do  a  broadcast on each of the known local interfaces
                listed in the interfaces parameter. This is the least reliable
                of  the  name  resolution  methods as it depends on the target
                host being on a locally connected subnet.

             The default order is lmhosts, host, wins, bcast and without  this
             parameter  or  any entry in the smb.conf(5) file the name resolu-
             tion methods will be attempted in this order.

       -m
          This option tells smbpasswd that the  account  being  changed  is  a
          MACHINE  account. Currently this is used when Samba is being used as
          an NT Primary Domain Controller.

          This option is only available when running smbpasswd as root.

       -U username
          This option may only be used in conjunction with the -r option. When
          changing  a password on a remote machine it allows the user to spec-
          ify the user name on that machine whose password will be changed. It
          is present to allow users who have different user names on different
          systems to change these passwords.

       -h
          This option prints the help string for smbpasswd, selecting the cor-
          rect one for running as root or as an ordinary user.

       -s
          This  option  causes smbpasswd to be silent (i.e. not issue prompts)
          and to read its old and new passwords from  standard  input,  rather
          than from /dev/tty (like the passwd(1) program does). This option is
          to aid people writing scripts to drive smbpasswd

       -w password
          This parameter is only available if Samba  has  been  compiled  with
          LDAP  support.  The  -w switch is used to specify the password to be
          used with the ldap admin dn. Note that the password is stored in the
          secrets.tdb  and  is keyed off of the admin's DN. This means that if
          the value of ldap admin dn ever changes, the password will  need  to
          be manually updated as well.

       -W
          NOTE: This option is same as "-w" except that the password should be
          entered using stdin.

          This parameter is only available if Samba  has  been  compiled  with
          LDAP  support.  The  -W switch is used to specify the password to be
          used with the ldap admin dn. Note that the password is stored in the
          secrets.tdb  and  is keyed off of the admin's DN. This means that if
          the value of ldap admin dn ever changes, the password will  need  to
          be manually updated as well.

       -i
          This  option  tells  smbpasswd  that the account being changed is an
          interdomain trust account. Currently this  is  used  when  Samba  is
          being  used as an NT Primary Domain Controller. The account contains
          the info about another trusted domain.

          This option is only available when running smbpasswd as root.

       -L
          Run in local mode.

       username
          This specifies the username for all of  the  root  only  options  to
          operate  on.  Only  root can specify this parameter as only root has
          the permission needed to modify attributes  directly  in  the  local
          smbpasswd file.


NOTES

       Since  smbpasswd works in client-server mode communicating with a local
       smbd for a non-root user then the smbd daemon must be running for  this
       to work. A common problem is to add a restriction to the hosts that may
       access the smbd running on the local machine by specifying either allow
       hosts  or  deny  hosts  entry in the smb.conf(5) file and neglecting to
       allow "localhost" access to the smbd.

       In addition, the smbpasswd command is only useful if Samba has been set
       up to use encrypted passwords.


VERSION

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


SEE ALSO

       smbpasswd(5), Samba(7).


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.

       The  original  Samba  man pages were written by Karl Auer. The man page
       sources were converted to YODL format (another excellent piece of  Open
       Source  software,  available  at  ftp://ftp.icce.rug.nl/pub/unix/)  and
       updated for the Samba 2.0 release by Jeremy Allison. The conversion  to
       DocBook for Samba 2.2 was done by Gerald Carter. The conversion to Doc-
       Book XML 4.2 for Samba 3.0 was done by Alexander Bokovoy.




                                                                  smbpasswd(8)

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