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//
// Mono.Security.Protocol.Ntlm.Type3Message - Authentication
//
// Author:
// Sebastien Pouliot (spouliot@motus.com)
//
// Copyright (C) 2003 Motus Technologies Inc. (http://www.motus.com)
//
// References
// a. NTLM Authentication Scheme for HTTP, Ronald Tschalär
// http://www.innovation.ch/java/ntlm.html
// b. The NTLM Authentication Protocol, Copyright © 2003 Eric Glass
// http://davenport.sourceforge.net/ntlm.html
//
using System;
using System.Text;
namespace Mono.Security.Protocol.Ntlm {
public class Type3Message : MessageBase {
static private byte[] header = { 0x4e, 0x54, 0x4c, 0x4d, 0x53, 0x53, 0x50, 0x00, 0x03, 0x00, 0x00, 0x00, 0x18, 0x00, 0x18, 0x00 };
private byte[] _challenge;
private string _host;
private string _domain;
private string _username;
private string _password;
private byte[] _lm;
private byte[] _nt;
private int _options;
public Type3Message () : base (3)
{
// default values
_domain = Environment.UserDomainName;
_host = Environment.MachineName;
_username = Environment.UserName;
_options = 0x8201;
}
public Type3Message (byte[] message) : base (3)
{
Decode (message);
}
~Type3Message ()
{
if (_challenge != null)
Array.Clear (_challenge, 0, _challenge.Length);
if (_lm != null)
Array.Clear (_lm, 0, _lm.Length);
if (_nt != null)
Array.Clear (_nt, 0, _nt.Length);
}
// properties
public byte[] Challenge {
get {
if (_challenge == null)
return null;
return (byte[]) _challenge.Clone (); }
set {
if (value == null)
throw new ArgumentNullException ("Challenge");
if (value.Length != 8)
throw new ArgumentException ("Invalid Challenge Length");
_challenge = (byte[]) value.Clone ();
}
}
public string Domain {
get { return _domain; }
set { _domain = value; }
}
public string Host {
get { return _host; }
set { _host = value; }
}
public int Options {
get { return _options; }
set { _options = value; }
}
public string Password {
get { return _password; }
set { _password = value; }
}
public string Username {
get { return _username; }
set { _username = value; }
}
public byte[] LM {
get { return _lm; }
}
public byte[] NT {
get { return _nt; }
}
// methods
private void Decode (byte[] message)
{
if (message == null)
throw new ArgumentNullException ("message");
for (int i=0; i < header.Length; i++) {
if (message [i] != header [i])
throw new ArgumentException ("Invalid Type3 message");
}
if (BitConverter.ToUInt16 (message, 56) != message.Length)
throw new ArgumentException ("Invalid Type3 message length");
_password = null;
int dom_len = BitConverter.ToUInt16 (message, 28);
int dom_off = 64;
_domain = Encoding.Unicode.GetString (message, dom_off, dom_len);
int host_len = BitConverter.ToUInt16 (message, 44);
int host_off = BitConverter.ToUInt16 (message, 48);
_host = Encoding.Unicode.GetString (message, host_off, host_len);
int user_len = BitConverter.ToUInt16 (message, 36);
int user_off = BitConverter.ToUInt16 (message, 40);
_username = Encoding.Unicode.GetString (message, user_off, user_len);
_options = BitConverter.ToUInt16 (message, 60);
_lm = new byte [24];
int lm_off = BitConverter.ToUInt16 (message, 16);
Buffer.BlockCopy (message, lm_off, _lm, 0, 24);
_nt = new byte [24];
int nt_off = BitConverter.ToUInt16 (message, 24);
Buffer.BlockCopy (message, nt_off, _nt, 0, 24);
if (message.Length >= 64)
Flags = (NtlmFlags) BitConverter.ToUInt32 (message, 60);
}
public override byte[] GetBytes ()
{
byte[] domain = Encoding.Unicode.GetBytes (_domain.ToUpper ());
byte[] user = Encoding.Unicode.GetBytes (_username);
byte[] host = Encoding.Unicode.GetBytes (_host.ToUpper ());
byte[] data = new byte [64 + domain.Length + user.Length + host.Length + 24 + 24];
Buffer.BlockCopy (header, 0, data, 0, header.Length);
// LM response
short lmresp_off = (short)(64 + domain.Length + user.Length + host.Length);
data [16] = (byte) lmresp_off;
data [17] = (byte)(lmresp_off >> 8);
// NT response
short ntresp_off = (short)(lmresp_off + 24);
data [20] = (byte) 0x18;
data [21] = (byte) 0x00;
data [22] = (byte) 0x18;
data [23] = (byte) 0x00;
data [24] = (byte) ntresp_off;
data [25] = (byte)(ntresp_off >> 8);
// domain
short dom_len = (short)domain.Length;
short dom_off = 64;
data [28] = (byte) dom_len;
data [29] = (byte)(dom_len >> 8);
data [30] = data [28];
data [31] = data [29];
data [32] = (byte) dom_off;
data [33] = (byte)(dom_off >> 8);
// username
short uname_len = (short)user.Length;
short uname_off = (short)(dom_off + dom_len);
data [36] = (byte) uname_len;
data [37] = (byte)(uname_len >> 8);
data [38] = data [36];
data [39] = data [37];
data [40] = (byte) uname_off;
data [41] = (byte)(uname_off >> 8);
// host
short host_len = (short)host.Length;
short host_off = (short)(uname_off + uname_len);
data [44] = (byte) host_len;
data [45] = (byte)(host_len >> 8);
data [46] = data [44];
data [47] = data [45];
data [48] = (byte) host_off;
data [49] = (byte)(host_off >> 8);
// message length
short msg_len = (short)data.Length;
data [56] = (byte) msg_len;
data [57] = (byte)(msg_len >> 8);
// options flags
data [60] = (byte) _options;
data [61] = (byte)(_options >> 8);
Buffer.BlockCopy (domain, 0, data, dom_off, domain.Length);
Buffer.BlockCopy (user, 0, data, uname_off, user.Length);
Buffer.BlockCopy (host, 0, data, host_off, host.Length);
using (ChallengeResponse ntlm = new ChallengeResponse (_password, _challenge)) {
Buffer.BlockCopy (ntlm.LM, 0, data, lmresp_off, 24);
Buffer.BlockCopy (ntlm.NT, 0, data, ntresp_off, 24);
}
return data;
}
}
}
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