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SMBPASSWD(8)									     SMBPASSWD(8)

       smbpasswd - change a user's SMB password

       When run by root:

       smbpasswd [ options ]  [ username ]  [ password ]


       smbpasswd [ options ]  [ password ]

       This tool is part of the  Samba 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 passwords are  usually  stored  in	the  smb-
       passwd(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 password 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  smbpasswd  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 password on remote
       machines, such as Windows NT Primary Domain Controllers.  See  the  (-r)  and  -U  options

       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.

       -L     Run the smbpasswd command in local mode. This allows a non-root user to specify the
	      root-only  options.  This is used mostly in test environments where a non-root user
	      needs to make changes to the local smbpasswd file.  The smbpasswd  file  must  have
	      read/write permissions for the user running the command.

       -h     This option prints the help string for smbpasswd.

       -c smb.conf file
	      This  option specifies that the configuration file specified should be used instead
	      of the default value specified at compile time.

       -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 cryp-

       -r remote machine name
	      This option allows a user to specify what machine they wish to change  their  pass-
	      word  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
	      resolution mechanism in all programs of the Samba suite. See the	-R  name  resolve
	      order parameter for details on changing this resolving mechanism.

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

	      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.

       -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 smb-

       -S     This option causes smbpasswd to query a domain controller of the	domain	specified
	      by  the workgroup parameter in smb.conf and store the domain SID in the secrets.tdb
	      file as its own machine SID. This is only useful when configuring a Samba  PDC  and
	      Samba BDC, or when migrating from a Windows PDC to a Samba PDC.

	      The  -r  options can be used as well to indicate a specific domain controller which
	      should be contacted. In this case, the domain SID  obtained  is  the  one  for  the
	      domain to which the remote machine belongs.

       -t     This  option  is used to force smbpasswd to change the current password assigned to
	      the machine trust account when operating in domain security mode.  This  is  really
	      meant to be used on systems that only run winbindd Under server installations, smbd
	      handle the password updates automatically.

       -U username[%pass]
	      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 specify the user name on that
	      machine whose password will be changed. It is present to allow users who have  dif-
	      ferent  user  names  on  different  systems to change these passwords. The optional
	      %pass may be used to specify to old password.

	      In particular, this parameter specifies the username used  to  create  the  machine
	      account when invoked with -j

       NOTE:  The  following options are available only when the smbpasswd command is run as root
	      or in local mode.

       -a     This option specifies that the username following should be added to the local smb-
	      passwd  file,  with  the new password typed. This option is ignored if the username
	      specified already exists in the smbpasswd file and it is	treated  like  a  regular
	      change  password	command. Note that the user to be added must already exist in the
	      system password file (usually /etc/passwd) else the request to add  the  user  will

       -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 information and so the user is
	      disabled by writing 'X' characters into the password space in the  smbpasswd  file.
	      See smbpasswd(5) for details on the 'old' and new password file formats.

       -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 dis-
	      abled  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 prompt for a new
	      password	for  this user, otherwise the account will be enabled by removing the 'D'
	      flag from account control space in the   smbpasswd  file.  See  smbpasswd  (5)  for
	      details on the 'old' and new password file formats.

       -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.

       -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 smb-
	      passwd file.

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

	      null passwords = yes

       -w password
	      This parameter is only available is Samba has been configured to use the experimen-
	      tal --with-ldapsam option. 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 private/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.

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

       -j DOMAIN
	      This option is used to add a Samba server into a Windows NT  Domain,  as	a  Domain
	      member capable of authenticating user accounts to any Domain Controller in the same
	      way as a Windows NT Server. See the security = domain option in the smb.conf(5) man

	      This command can work both with and without the -U parameter.

	      When invoked with -U, that username (and optional password) are used to contact the
	      PDC (which must be specified with -r) to both create a machine account, and to  set
	      a password on it.

	      Alternately, if -U is omitted, Samba will contact its PDC and attempt to change the
	      password on a pre-existing account.

	      In order to be used in this way, the Administrator for the Windows NT  Domain  must
	      have  used the program "Server Manager for Domains" to add the primary NetBIOS name
	      of the Samba server as a member of the Domain.

	      After this has been done, to join the Domain invoke  smbpasswd with this parameter.
	      smbpasswd  will then look up the Primary Domain Controller for the Domain (found in
	      the smb.conf file in the parameter password server and change the  machine  account
	      password used to create the secure Domain communication.

	      Either  way,  this password is then stored by smbpasswd in a TDB, writeable only by
	      root, called secrets.tdb

	      Once this operation has been performed the  smb.conf file may be updated to set the
	      security	= domain option and all future logins to the Samba server will be authen-
	      ticated to the Windows NT PDC.

	      Note that even though the authentication is being done to the PDC all users access-
	      ing  the	Samba  server  must still have a valid UNIX account on that machine.  The
	      winbindd(8) daemon can be used to create UNIX accounts for NT users.

       -R name resolve order
	      This option allows the user of smbpasswd to determine what name resolution 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 dependent. For instance, on IRIX or Solaris this may be controlled by  the
		/etc/nsswitch.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 inter-
		faces 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 file the name resolution methods will be attempted in this order.

	      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.

	      This specifies the new password. If this parameter is specified  you  will  not  be
	      prompted for the new password.

       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 speci-
       fying a allow hosts or deny hosts entry in the  smb.conf  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. See the file ENCRYPTION.txt in the docs directory for details on  how
       to do this.

       This man page is correct for version 2.2 of the Samba suite.

       smbpasswd(5) samba(7)

       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 con-
       verted to YODL format (another excellent piece  of  Open  Source  software,  available  at
       ftp://ftp.icce.rug.nl/pub/unix/ <URL: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

					 19 November 2002			     SMBPASSWD(8)
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