ntlm_auth - tool to allow external access to Winbind's NTLM authentication function ntlm_auth [-d debuglevel] [-l logfile] [-s <smb config file>] 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). 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. --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 ntlmssp-client-1 Cleint-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. 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. --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. --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. -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|--debug=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 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. -l|--logfile=logbasename File name for log/debug files. The extension ".client" will be appended. The log file is never removed by the client. -h|--help Print a summary of command line options. 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. 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 readthe Microsoft Knowledge Base article #239869 and follow instructions described there. This man page is correct for version 3.0 of the Samba suite. 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.