NAME Authen::NTLM - Perl extension for NTLM related computations SYNOPSIS use Authen::NTLM qw(nt_hash lm_hash); $my_pass = "mypassword"; $client = new_client Authen::NTLM(lm_hash($my_pass), nt_hash($my_pass)); # To compose a NTLM Negotiate Packet $flags = Authen::NTLM::NTLMSSP_NEGOTIATE_80000000 | Authen::NTLM::NTLMSSP_NEGOTIATE_128 | Authen::NTLM::NTLMSSP_NEGOTIATE_ALWAYS_SIGN | Authen::NTLM::NTLMSSP_NEGOTIATE_OEM_DOMAIN_SUPPLIED | Authen::NTLM::NTLMSSP_NEGOTIATE_OEM_WORKSTATION_SUPPLIED | Authen::NTLM::NTLMSSP_NEGOTIATE_NTLM | Authen::NTLM::NTLMSSP_NEGOTIATE_UNICODE | Authen::NTLM::NTLMSSP_NEGOTIATE_OEM | Authen::NTLM::NTLMSSP_REQUEST_TARGET; $negotiate_msg = $client->negotiate_msg($flags); # To instantiate a server to parse a NTLM negotiation # and compose a NTLM challenge $server = new_server Authen::NTLM; ($flags, $domain, $machine) = $server->parse_negotiate($negotiate_msg); $flags = Authen::NTLM::NTLMSSP_NEGOTIATE_ALWAYS_SIGN | Authen::NTLM::NTLMSSP_NEGOTIATE_NTLM | Authen::NTLM::NTLMSSP_REQUEST_INIT_RESPONSE | Authen::NTLM::NTLMSSP_NEGOTIATE_UNICODE | Authen::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::NTLM::NTLMSSP_NEGOTIATE_ALWAYS_SIGN | Authen::NTLM::NTLMSSP_NEGOTIATE_NTLM | Authen::NTLM::NTLMSSP_NEGOTIATE_UNICODE | Authen::NTLM::NTLMSSP_REQUEST_TARGET; $auth_msg = $client->auth_msg($nonce, $flags); # To parse a NTLM Response Packet ($flags, $lm_resp, $nt_resp, $user_domain, $username, $machine) = $server->parse_auth($auth_msg); 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 compute session key. 2) Implement the module in C. BUGS Nothing known. AUTHOR This implementation was written by Yee Man Chan (ymc@yahoo.com). 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). NAME Authen::NTLM::HTTP - Perl extension for NTLM-over-HTTP related computations Background NTLM-over-HTTP Handshake Stage 1: Client requests a web page. 1: C --> S GET ... Stage 2: Server responds and says the client needs to authenticate in NTLM manner. 2: C <-- S 401 Unauthorized WWW-Authenticate: NTLM Stage 3: Client responds with NTLM negotiate message that contains the identity and the domain of the client. 3: C --> S GET ... Authorization: NTLM Stage 4: Server challenges the client with a 8-bytes random number in the NTLM challenge message. 4: C <-- S 401 Unauthorized WWW-Authenticate: NTLM Stage 5: Client responds with a reply that uses its password to encrypt the 8-bytes random number. 5: C --> S GET ... Authorization: NTLM Stage 6: Authentication success. Server replies with the web page. 6: C <-- S 200 Ok SYNOPSIS use Authen::NTLM (nt_hash lm_hash); use Authen::NTLM::HTTP; $my_pass = "mypassword"; # Note: To instantiate a client talking to a proxy, do # $client = new_client Authen::NTLM::HTTP(lm_hash($my_pass), nt_hash($my_pass), Authen::NTLM::HTTP::NTLMSSP_HTTP_PROXY); $client = new_client Authen::NTLM::HTTP(lm_hash($my_pass), nt_hash($my_pass)); # Stage 3 scenario: creates NTLM negotiate message and then # append $negotiate_msg to one of the tag lines in your HTTP # request header # To compose a NTLM Negotiate Packet $flags = Authen::NTLM::NTLMSSP_NEGOTIATE_ALWAYS_SIGN | Authen::NTLM::NTLMSSP_NEGOTIATE_OEM_DOMAIN_SUPPLIED | Authen::NTLM::NTLMSSP_NEGOTIATE_OEM_WORKSTATION_SUPPLIED | Authen::NTLM::NTLMSSP_NEGOTIATE_NTLM | Authen::NTLM::NTLMSSP_NEGOTIATE_UNICODE | Authen::NTLM::NTLMSSP_NEGOTIATE_OEM $negotiate_msg = $client->http_negotiate($flags); # Stage 4 scenario: extract the line contains "Authorization: NTLM " # in the HTTP header. # Parses NTLM negotiate message and then generates # the NTLM challenge message. # To instantiate a server to parse a NTLM negotiation # and compose a NTLM challenge # Note: To instantiate a proxy, do # $server = new_server Authen::NTLM::HTTP(Authen::NTLM::HTTP::NTLMSSP_HTTP_PROXY); $server = new_server Authen::NTLM::HTTP; ($flags, $domain, $machine) = $server->http_parse_negotiate($negotiate_msg); $flags = Authen::NTLM::NTLMSSP_NEGOTIATE_ALWAYS_SIGN | Authen::NTLM::NTLMSSP_NEGOTIATE_NTLM | Authen::NTLM::NTLMSSP_NEGOTIATE_UNICODE; $challenge_msg = $server->http_challenge($flags); # Stage 5 Scenario: Client receives NTLM challenge message # Extract the line that contains "WWW-Authenticate: NTLM " # Pass it to http_parse_challenge to obtain the nonce # Then use nonce to compose reply with http_auth # client parse NTLM challenge ($domain, $flags, $nonce, $ctx_upper, $ctx_lower) = $client->http_parse_challenge($challenge_msg); # To compose a NTLM Response Packet $flags = Authen::NTLM::NTLMSSP_NEGOTIATE_ALWAYS_SIGN | Authen::NTLM::NTLMSSP_NEGOTIATE_NTLM | Authen::NTLM::NTLMSSP_NEGOTIATE_UNICODE | Authen::NTLM::NTLMSSP_REQUEST_TARGET; $auth_msg = $client->http_auth($nonce, $flags); # Stage 6 Scenario: Finally the server parses the reply # verify the authentication credentials. # To parse a NTLM Response Packet ($flags, $lm_resp, $nt_resp, $user_domain, $username, $machine) = $server->http_parse_auth($auth_msg); DESCRIPTION This is an extension of the Authen::NTLM module written by Yee Man Chan. It was written due to popular requests. Yee Man Chan never tests it in any production environment but he is confident that it should work as expected. DEPENDENCIES To use this module, please install the following two modules: 1) Authen::NTLM module by Yee Man Chan (UMVUE) 2) MIME::Base64 module by Gisle Aas (GAAS). TO-DO Supposedly this implementation is complete. Improvements will be done on the underlying Authen::NTLM module. However, if you figure out something I missed, feel free to let me know. BUGS Nothing known. AUTHOR This implementation was written by Yee Man Chan (ymc@yahoo.com). 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 Authen::NTLM(3), MIME::Base64(3), perl(1), m4(1).