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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 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 us-
er’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 lo-
cally running smbd(8). As a consequence in order for this to succeed the smbd dae-
mon 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 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 PASS-
WORD" 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 op-
tions below.
When run by root, smbpasswd allows new users to be added and deleted in the smb-
passwd 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 direct-
ly, 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 lo-
cal 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 com-
mand. Note that the default passdb backends require the user to already ex-
ist 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 â€â€™Dâ€â€™ flag into the account
control space in the smbpasswd file. Once this is done all attempts to au-
thenticate 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 com-
mand 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 pass-
word 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 con-
tact to attempt the password change. This name is resolved into an IP ad-
dress 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 speci-
fied 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:
· 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.
· 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 oper-
ating system depended for instance on IRIX or Solaris this may be con-
trolled 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.
· wins: Query a name with the IP address listed in the wins server parame-
ter. If no WINS server has been specified this method will be ignored.
· 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 at-
tempted in this order.
-m This option tells smbpasswd that the account being changed is a MACHINE ac-
count. Currently this is used when Samba is being used as an NT Primary Do-
main 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 chang-
ing 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 sup-
port. The -w switch is used to specify the password to be used with theldap
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 en-
tered using stdin.
This parameter is only available if Samba has been compiled with LDAP sup-
port. The -W switch is used to specify the password to be used with theldap
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 Pri-
mary 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 theroot 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 prob-
lem 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, avail-
able 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.
SMBPASSWD(8)
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Under GNU General Public License
2009-01-10 12:24 @38.103.63.58 CrawledBy CCBot/1.0 (+http://www.commoncrawl.org/bot.html)