psiphon-tunnel-core/psiphon/upstreamproxy/go-ntlm

This is a fork of the package that previously existed at https://github.com/ThomsonReutersEikon/go-ntlm/ntlm. It contains several bug fixes, tagged with "[Psiphon]".

Original github.com/ThomsonReutersEikon/go-ntlm/ntlm README:

NTLM Implementation for Go

This is a native implementation of NTLM for Go that was implemented using the Microsoft MS-NLMP documentation available at http://msdn.microsoft.com/en-us/library/cc236621.aspx. The library is currently in use and has been tested with connectionless NTLMv1 and v2 with and without extended session security.

Usage Notes

Currently the implementation only supports connectionless (datagram) oriented NTLM. We did not need connection oriented NTLM for our usage and so it is not implemented. However it should be extremely straightforward to implement connection oriented NTLM as all the operations required are present in the library. The major missing piece is the negotiation of capabilities between the client and the server, for our use we hardcoded a supported set of negotiation flags.

Sample Usage as NTLM Client

import "github.com/ThomsonReutersEikon/go-ntlm/ntlm"

session, err = ntlm.CreateClientSession(ntlm.Version2, ntlm.ConnectionlessMode)
session.SetUserInfo("someuser","somepassword","somedomain")

negotiate := session.GenerateNegotiateMessage()

<send negotiate to server>

challenge, err := ntlm.ParseChallengeMessage(challengeBytes)
session.ProcessChallengeMessage(challenge)

authenticate := session.GenerateAuthenticateMessage()

<send authenticate message to server>

Sample Usage as NTLM Server

session, err := ntlm.CreateServerSession(ntlm.Version1, ntlm.ConnectionlessMode)
session.SetUserInfo("someuser","somepassword","somedomain")

challenge := session.GenerateChallengeMessage()

<send challenge to client>

<receive authentication bytes>

auth, err := ntlm.ParseAuthenticateMessage(authenticateBytes)
session.ProcessAuthenticateMessage(auth)

Generating a message MAC

Once a session is created you can generate the Mac for a message using:

message := "this is some message to sign"
sequenceNumber := 100
signature, err := session.Mac([]byte(message), sequenceNumber)

License

Copyright Thomson Reuters Global Resources 2013 Apache License