NAME

       ntlm_auth - tool to allow external access to Winbind's NTLM authentication function

SYNOPSIS

       ntlm_auth

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
       intended 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).

               Currently implemented parameters from the external program to the helper are:

               Username
                   The username, expected to be in Samba's unix charset.

                   Examples:
                       Username: bob

                       Username:: Ym9i

               NT-Domain
                   The user's domain, expected to be in Samba's unix charset.

                   Examples:
                       NT-Domain: WORKGROUP

                       NT-Domain:: V09SS0dST1VQ

               Full-Username
                   The fully qualified username, expected to be in Samba's unix charset and
                   qualified with the winbind separator.

                   Examples:
                       Full-Username: WORKGROUP\bob

                       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.

                   Examples:
                       LANMAN-Challenge: 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.

                   Examples:
                       LANMAN-Response: 0102030405060708090A0B0C0D0E0F101112131415161718

               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.

                   Examples:
                       NT-Response: 0102030405060708090A0B0C0D0E0F10111213141516171

               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.

                   Examples:
                       Password: samba2

                       Password:: c2FtYmEy

               Request-User-Session-Key
                   Upon successful authenticaiton, return the user session key associated with
                   the login.

                   Examples:
                       Request-User-Session-Key: Yes

               Request-LanMan-Session-Key
                   Upon successful authenticaiton, return the LANMAN session key associated with
                   the login.

                   Examples:
                       Request-LanMan-Session-Key: Yes

               Warning
               Implementers 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
           Retrieve 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.

       --pam-winbind-conf=FILENAME
           Define the path to the pam_winbind.conf file.

       --target-hostname=HOSTNAME
           Define the target hostname.

       --target-service=SERVICE
           Define the target service.

       --use-cached-creds
           Whether to use credentials cached by winbindd.

       --allow-mschapv2
           Explicitly allow MSCHAPv2.

       --offline-logon
           Allow offline logons for plain text auth.

       --configfile=<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.

       -V|--version
           Prints the program version number.

       -?|--help
           Print a summary of command line options.

       --usage
           Display brief usage message.

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 Millennium 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 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.