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 default passdb backend.
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 is only available when running smbpasswd as root.
-c
-x
This option is only available when running smbpasswd as root.
-d
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
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
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
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
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
The options are :"lmhosts", "host", "wins" and "bcast". They cause names to be resolved as follows:
-m
This option is only available when running smbpasswd as root.
-U username
-h
-s
-w password
-W
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 is only available when running smbpasswd as root.
-L
username
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 part of version 4.19.4 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.
04/24/2024 | Samba 4.19.4 |