NTLM_AUTH(1) NTLM_AUTH(1)
NAME
ntlm_auth - tool to allow external access to Winbind's NTLM authentication function
SYNOPSIS
ntlm_auth [-ddebuglevel] [-llogdir] [-s<smbconfigfile>]
DESCRIPTION
This tool is part of the samba(7) suite.
ntlm_auth is a helper utility that authenticates users using NT/LM authentication. It returns 0 if the users is authenticated successfully
and 1 if access was denied. ntlm_auth uses winbind to access the user and authentication data for a domain. This utility is only indended
to be used by other programs (currently Squid and mod_ntlm_winbind)
OPERATIONAL REQUIREMENTS
The winbindd(8) daemon must be operational for many of these commands to function.
Some of these commands also require access to the directory winbindd_privileged in $LOCKDIR. This should be done either by running this
command as root or providing group access to the winbindd_privileged directory. For security reasons, this directory should not be world-
accessable.
OPTIONS
--helper-protocol=PROTO
Operate as a stdio-based helper. Valid helper protocols are:
squid-2.4-basic
Server-side helper for use with Squid 2.4's basic (plaintext) authentication.
squid-2.5-basic
Server-side helper for use with Squid 2.5's basic (plaintext) authentication.
squid-2.5-ntlmssp
Server-side helper for use with Squid 2.5's NTLMSSP authentication.
Requires access to the directory winbindd_privileged in $LOCKDIR. The protocol used is described here: http://devel.squid-
cache.org/ntlm/squid_helper_protocol.html. This protocol has been extended to allow the NTLMSSP Negotiate packet to be included as
an argument to the YR command. (Thus avoiding loss of information in the protocol exchange).
ntlmssp-client-1
Client-side helper for use with arbitary external programs that may wish to use Samba's NTLMSSP authentication knowlege.
This helper is a client, and as such may be run by any user. The protocol used is effectivly the reverse of the previous protocol.
A YR command (without any arguments) starts the authentication exchange.
gss-spnego
Server-side helper that implements GSS-SPNEGO. This uses a protocol that is almost the same as squid-2.5-ntlmssp, but has some
subtle differences that are undocumented outside the source at this stage.
Requires access to the directory winbindd_privileged in $LOCKDIR.
gss-spnego-client
Client-side helper that implements GSS-SPNEGO. This also uses a protocol similar to the above helpers, but is currently undocu-
mented.
ntlm-server-1
Server-side helper protocol, intended for use by a RADIUS server or the 'winbind' plugin for pppd, for the provision of MSCHAP and
MSCHAPv2 authentication.
This protocol consists of lines in for form: Parameter: value and Paramter:: Base64-encode value. The presence of a single period
indicates that one side has finished supplying data to the other. (Which in turn could cause the helper to authenticate the user).
Curently implemented parameters from the external program to the helper are:
Username
The username, expected to be in Samba's unix charset.
Example1.Username: bob
Example2.Username:: Ym9i
Username
The user's domain, expected to be in Samba's unix charset.
Example3.Domain: WORKGROUP
Example4.Domain:: V09SS0dST1VQ
Full-Username
The fully qualified username, expected to be in Samba's
and qualified with the winbind separator.
Example5.Full-Username: WORKGROUPb
Example6.Full-Username:: V09SS0dST1VQYm9i
LANMAN-Challenge
The 8 byte LANMAN Challenge value, generated randomly by the server, or (in cases such as MSCHAPv2) generated in some way by
both the server and the client.
Example7.LANMAN-Challege: 0102030405060708
LANMAN-Response
The 24 byte LANMAN Response value, calculated from the user's password and the supplied LANMAN Challenge. Typically, this is
provided over the network by a client wishing to authenticate.
Example8.LANMAN-Response: 0102030405060708090A0B0C0D0E0F101112131415161718
NT-Response
The >= 24 byte NT Response calculated from the user's password and the supplied LANMAN Challenge. Typically, this is pro-
vided over the network by a client wishing to authenticate.
Example9.NT-Response: 0102030405060708090A0B0C0D0E0F101112131415161718
Password
The user's password. This would be provided by a network client, if the helper is being used in a legacy situation that
exposes plaintext passwords in this way.
Example10.Password: samba2
Example11.Password:: c2FtYmEy
Request-User-Session-Key
Apon sucessful authenticaiton, return the user session key associated with the login.
Example12.Request-User-Session-Key: Yes
Request-LanMan-Session-Key
Apon sucessful authenticaiton, return the LANMAN session key associated with the login.
Example13.Request-LanMan-Session-Key: Yes
Warning
Implementors should take care to base64 encode any data (such as usernames/passwords) that may contain malicous user
data, such as a newline. They may also need to decode strings from the helper, which likewise may have
been base64 encoded.
--username=USERNAME
Specify username of user to authenticate
--domain=DOMAIN
Specify domain of user to authenticate
--workstation=WORKSTATION
Specify the workstation the user authenticated from
--challenge=STRING
NTLM challenge (in HEXADECIMAL)
--lm-response=RESPONSE
LM Response to the challenge (in HEXADECIMAL)
--nt-response=RESPONSE
NT or NTLMv2 Response to the challenge (in HEXADECIMAL)
--password=PASSWORD
User's plaintext password
If not specified on the command line, this is prompted for when required.
For the NTLMSSP based server roles, this paramter specifies the expected password, allowing testing without winbindd operational.
--request-lm-key
Retreive LM session key
--request-nt-key
Request NT key
--diagnostics
Perform Diagnostics on the authentication chain. Uses the password from --password or prompts for one.
--require-membership-of={SID|Name}
Require that a user be a member of specified group (either name or SID) for authentication to succeed.
-V
Prints the program version number.
-s <configuration file>
The file specified contains the configuration details required by the server. The information in this file includes server-specific
information such as what printcap file to use, as well as descriptions of all the services that the server is to provide. See smb.conf
for more information. The default configuration file name is determined at compile time.
-d|--debuglevel=level
level 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 the server. At level 0, only critical
errors and serious warnings will be logged. Level 1 is a reasonable level for day-to-day running - it generates a small amount of infor-
mation about operations carried out.
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.
Note that specifying this parameter here will override the
parameter in the smb.conf file.
-l|--logfile=logdirectory
Base directory name for log/debug files. The extension ".progname" will be appended (e.g. log.smbclient, log.smbd, etc...). The log file
is never removed by the client.
-h|--help
Print a summary of command line options.
EXAMPLE SETUP
To setup ntlm_auth for use by squid 2.5, with both basic and NTLMSSP authentication, the following should be placed in the squid.conf file.
auth_param ntlm program ntlm_auth --helper-protocol=squid-2.5-ntlmssp
auth_param basic program ntlm_auth --helper-protocol=squid-2.5-basic
auth_param basic children 5
auth_param basic realm Squid proxy-caching web server
auth_param basic credentialsttl 2 hours
Note
This example assumes that ntlm_auth has been installed into your path, and that the group permissions on winbindd_privileged are as
described above.
To setup ntlm_auth for use by squid 2.5 with group limitation in addition to the above example, the following should be added to the
squid.conf file.
auth_param ntlm program ntlm_auth --helper-protocol=squid-2.5-ntlmssp --require-membership-of='WORKGROUPauth_param basic program ntlm_auth --helper-protocol=squid-2.5-basic --require-membership-of='WORKGROUP
TROUBLESHOOTING
If you're experiencing problems with authenticating Internet Explorer running under MS Windows 9X or Millenium Edition against ntlm_auth's
NTLMSSP authentication helper (--helper-protocol=squid-2.5-ntlmssp), then please read the Microsoft Knowledge Base article #239869 and fol-
low instructions described there.
VERSION
This man page is correct for version 3.0 of the Samba suite.
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 ntlm_auth manpage was written by Jelmer Vernooij and Andrew Bartlett.
NTLM_AUTH(1)