SMBPASSWD(8)                                                System Administration tools                                               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 username[%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 passwords 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
       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 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 following already exists in the smbpasswd file and it is treated
           like a regular change password command. Note that the default passdb backends 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
           information 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 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

           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 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 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 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 depended 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 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 resolution
           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
           specify 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 correct 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 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 DocBook XML 4.2 for Samba 3.0 was done by Alexander Bokovoy.

Samba 3.5                                                           06/18/2010                                                        SMBPASSWD(8)