ntlm_auth(1)
NAME
ntlm_auth - tool to allow external access to Winbind's NTLM
authentication function
SYNOPSIS
ntlm_auth [-d debuglevel] [-l logdir] [-s <smb config file>]
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 arbitrary external programs
that may wish to use Samba's NTLMSSP authentication knowledge.
This helper is a client, and as such may be run by any user.
The protocol used is effectively 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
undocumented.
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 the form: Parameter: value
and Parameter:: 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.
Username
The user's domain, expected to be in Samba's unix charset.
Full-Username
The fully qualified username, expected to be in Samba's
unix charset and qualified with the winbind separator.
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.
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.
NT-Response
The >= 24 byte NT Response calculated from the user's
password and the supplied LANMAN Challenge. Typically, this
is provided over the network by a client wishing to
authenticate.
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.
Request-User-Session-Key
Apon sucessful authenticaiton, return the user session key
associated with the login.
Request-LanMan-Session-Key
Apon sucessful authenticaiton, return the LANMAN session
key associated with the login.
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 parameter 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.
-d|--debuglevel=level
level is an integer from 0 to 10. The default value if this
parameter is not specified is 0.
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
information 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 log
level parameter in the smb.conf file.
-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.
-l|--log-basename=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='WORKGROUP\Domain Users'
auth_param basic program ntlm_auth --helper-protocol=squid-2.5-basic --require-membership-of='WORKGROUP\Domain Users'
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
follow 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.
Samba 3.0 05/28/2008 NTLM_AUTH(1)
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