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//
// Mono.Security.Protocol.Ntlm.Type2Message - Challenge
//
// Author:
// Sebastien Pouliot <sebastien@ximian.com>
//
// Copyright (C) 2003 Motus Technologies Inc. (http://www.motus.com)
// Copyright (C) 2004 Novell, Inc (http://www.novell.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
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Text;
using System.Security.Cryptography;
namespace Mono.Security.Protocol.Ntlm {
public class Type2Message : MessageBase {
private byte[] _nonce;
private string _targetName;
private byte[] _targetInfo;
public Type2Message () : base (2)
{
_nonce = new byte [8];
RandomNumberGenerator rng = RandomNumberGenerator.Create ();
rng.GetBytes (_nonce);
// default values
Flags = (NtlmFlags) 0x8201;
}
public Type2Message (byte[] message) : base (2)
{
_nonce = new byte [8];
Decode (message);
}
~Type2Message ()
{
if (_nonce != null)
Array.Clear (_nonce, 0, _nonce.Length);
}
// properties
public byte[] Nonce {
get { return (byte[]) _nonce.Clone (); }
set {
if (value == null)
throw new ArgumentNullException ("Nonce");
if (value.Length != 8) {
string msg = Locale.GetText ("Invalid Nonce Length (should be 8 bytes).");
throw new ArgumentException (msg, "Nonce");
}
_nonce = (byte[]) value.Clone ();
}
}
public string TargetName {
get { return _targetName; }
}
public byte[] TargetInfo {
get { return (byte[])_targetInfo.Clone (); }
}
// methods
protected override void Decode (byte[] message)
{
base.Decode (message);
Flags = (NtlmFlags)BitConverterLE.ToUInt32 (message, 20);
Buffer.BlockCopy (message, 24, _nonce, 0, 8);
var tname_len = BitConverterLE.ToUInt16 (message, 12);
var tname_off = BitConverterLE.ToUInt16 (message, 16);
if (tname_len > 0) {
if ((Flags & NtlmFlags.NegotiateOem) != 0)
_targetName = Encoding.ASCII.GetString (message, tname_off, tname_len);
else
_targetName = Encoding.Unicode.GetString (message, tname_off, tname_len);
}
// The Target Info block is optional.
if (message.Length >= 48) {
var tinfo_len = BitConverterLE.ToUInt16 (message, 40);
var tinfo_off = BitConverterLE.ToUInt16 (message, 44);
if (tinfo_len > 0) {
_targetInfo = new byte [tinfo_len];
Buffer.BlockCopy (message, tinfo_off, _targetInfo, 0, tinfo_len);
}
}
}
public override byte[] GetBytes ()
{
byte[] data = PrepareMessage (40);
// message length
short msg_len = (short)data.Length;
data [16] = (byte) msg_len;
data [17] = (byte)(msg_len >> 8);
// flags
data [20] = (byte) Flags;
data [21] = (byte)((uint)Flags >> 8);
data [22] = (byte)((uint)Flags >> 16);
data [23] = (byte)((uint)Flags >> 24);
Buffer.BlockCopy (_nonce, 0, data, 24, _nonce.Length);
return data;
}
}
}
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