2 // Mono.Security.Protocol.Ntlm.Type2Message - Challenge
5 // Sebastien Pouliot <sebastien@ximian.com>
7 // Copyright (C) 2003 Motus Technologies Inc. (http://www.motus.com)
8 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
11 // a. NTLM Authentication Scheme for HTTP, Ronald Tschalär
12 // http://www.innovation.ch/java/ntlm.html
13 // b. The NTLM Authentication Protocol, Copyright © 2003 Eric Glass
14 // http://davenport.sourceforge.net/ntlm.html
16 // Permission is hereby granted, free of charge, to any person obtaining
17 // a copy of this software and associated documentation files (the
18 // "Software"), to deal in the Software without restriction, including
19 // without limitation the rights to use, copy, modify, merge, publish,
20 // distribute, sublicense, and/or sell copies of the Software, and to
21 // permit persons to whom the Software is furnished to do so, subject to
22 // the following conditions:
24 // The above copyright notice and this permission notice shall be
25 // included in all copies or substantial portions of the Software.
27 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
28 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
29 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
30 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
31 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
32 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
33 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
38 using System.Security.Cryptography;
40 namespace Mono.Security.Protocol.Ntlm {
42 public class Type2Message : MessageBase {
44 private byte[] _nonce;
45 private string _targetName;
46 private byte[] _targetInfo;
48 public Type2Message () : base (2)
50 _nonce = new byte [8];
51 RandomNumberGenerator rng = RandomNumberGenerator.Create ();
52 rng.GetBytes (_nonce);
54 Flags = (NtlmFlags) 0x8201;
57 public Type2Message (byte[] message) : base (2)
59 _nonce = new byte [8];
66 Array.Clear (_nonce, 0, _nonce.Length);
72 get { return (byte[]) _nonce.Clone (); }
75 throw new ArgumentNullException ("Nonce");
76 if (value.Length != 8) {
77 string msg = Locale.GetText ("Invalid Nonce Length (should be 8 bytes).");
78 throw new ArgumentException (msg, "Nonce");
80 _nonce = (byte[]) value.Clone ();
84 public string TargetName {
85 get { return _targetName; }
88 public byte[] TargetInfo {
89 get { return (byte[])_targetInfo.Clone (); }
94 protected override void Decode (byte[] message)
96 base.Decode (message);
98 Flags = (NtlmFlags)BitConverterLE.ToUInt32 (message, 20);
100 Buffer.BlockCopy (message, 24, _nonce, 0, 8);
102 var tname_len = BitConverterLE.ToUInt16 (message, 12);
103 var tname_off = BitConverterLE.ToUInt16 (message, 16);
105 if ((Flags & NtlmFlags.NegotiateOem) != 0)
106 _targetName = Encoding.ASCII.GetString (message, tname_off, tname_len);
108 _targetName = Encoding.Unicode.GetString (message, tname_off, tname_len);
111 // The Target Info block is optional.
112 if (message.Length >= 48) {
113 var tinfo_len = BitConverterLE.ToUInt16 (message, 40);
114 var tinfo_off = BitConverterLE.ToUInt16 (message, 44);
116 _targetInfo = new byte [tinfo_len];
117 Buffer.BlockCopy (message, tinfo_off, _targetInfo, 0, tinfo_len);
122 public override byte[] GetBytes ()
124 byte[] data = PrepareMessage (40);
127 short msg_len = (short)data.Length;
128 data [16] = (byte) msg_len;
129 data [17] = (byte)(msg_len >> 8);
132 data [20] = (byte) Flags;
133 data [21] = (byte)((uint)Flags >> 8);
134 data [22] = (byte)((uint)Flags >> 16);
135 data [23] = (byte)((uint)Flags >> 24);
137 Buffer.BlockCopy (_nonce, 0, data, 24, _nonce.Length);