NAME
   Authen::Perl::NTLM - Perl extension for NTLM related computations

SYNOPSIS
   use Authen::Perl::NTLM qw(nt_hash lm_hash);

       $my_pass = "mypassword";
       $client = new_client Authen::Perl::NTLM(lm_hash($my_pass), nt_hash($my_pass));

   # To compose a NTLM Negotiate Packet $flags =
   Authen::Perl::NTLM::NTLMSSP_NEGOTIATE_80000000 |
   Authen::Perl::NTLM::NTLMSSP_NEGOTIATE_128 |
   Authen::Perl::NTLM::NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
   Authen::Perl::NTLM::NTLMSSP_NEGOTIATE_OEM_DOMAIN_SUPPLIED |
   Authen::Perl::NTLM::NTLMSSP_NEGOTIATE_OEM_WORKSTATION_SUPPLIED |
   Authen::Perl::NTLM::NTLMSSP_NEGOTIATE_NTLM |
   Authen::Perl::NTLM::NTLMSSP_NEGOTIATE_UNICODE |
   Authen::Perl::NTLM::NTLMSSP_NEGOTIATE_OEM |
   Authen::Perl::NTLM::NTLMSSP_REQUEST_TARGET; $negotiate_msg =
   $client->negotiate_msg($flags);

   # To instantiate a server to compose a NTLM challenge $server =
   new_server Authen::Perl::NTLM; $flags =
   Authen::Perl::NTLM::NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
   Authen::Perl::NTLM::NTLMSSP_NEGOTIATE_NTLM |
   Authen::Perl::NTLM::NTLMSSP_REQUEST_INIT_RESPONSE |
   Authen::Perl::NTLM::NTLMSSP_NEGOTIATE_UNICODE |
   Authen::Perl::NTLM::NTLMSSP_REQUEST_TARGET; $challenge_msg =
   $server->challenge_msg($flags);

   # client parse NTLM challenge ($domain, $flags, $nonce, $ctx_upper,
   $ctx_lower) = $client->parse_challenge($challenge_msg);

   # To compose a NTLM Response Packet $flags =
   Authen::Perl::NTLM::NTLMSSP_NEGOTIATE_ALWAYS_SIGN |
   Authen::Perl::NTLM::NTLMSSP_NEGOTIATE_NTLM |
   Authen::Perl::NTLM::NTLMSSP_NEGOTIATE_UNICODE |
   Authen::Perl::NTLM::NTLMSSP_REQUEST_TARGET; $auth_msg =
   $client->auth_msg($nonec, $flags);

DESCRIPTION
   The NTLM (Windows NT LAN Manager) authentication scheme is the
   authentication algorithm used by Microsoft.

   NTLM authentication scheme is used in DCOM and HTTP environment. It is
   used to authenticate DCE RPC packets in DCOM. It is also used to
   authenticate HTTP packets to MS Web Proxy or MS Web Server.

   Currently, it is the authentication scheme Internet Explorer chooses to
   authenticate itself to proxies/web servers that supports NTLM.

   As of this version, NTLM module only provides the client side functions
   to calculate NT response and LM response. The next revision will provide
   the server side functions that computes the nonce and verify the NTLM
   responses.

   This module was written without the knowledge of Mark Bush's (MARKBUSH)
   NTLM implementation. It was used by Yee Man Chan to implement a Perl
   DCOM client.

DEPENDENCIES
   To use this module, please install the one of the following two sets of
   DES and MD4 modules:

   1) Crypt::DES module by Dave Paris (DPARIS) and Digest::MD4 module by
   Mike McCauley (MIKEM) first. These two modules are implemented in C.

   2) Crypt::DES_PP module by Guido Flohr (GUIDO) and Digest::Perl::MD4
   module by Ted Anderson (OTAKA). These two modules are implemented in
   Perl.

   The first set of modules will be preferred by NTLM because they are
   supposedly faster.

TO-DO
   1) A function to parse NTLM negotiation packet for DCE RPC.

   2) A function to parse NTLM response packet for DCE RPC.

   3) A function to compute session key for DCE RPC.

   4) Implement the module in C.

BUGS
   Nothing known.

AUTHOR
   This implementation was written by Yee Man Chan ([email protected]).
   Copyright (c) 2002 Yee Man Chan. All rights reserved. This program is
   free software; you can redistribute it and/or modify it under the same
   terms as Perl itself.

SEE ALSO
   Digest::MD4(3), Crypt::DES(3), perl(1), m4(1).

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