class/System.ServiceModel/Mono.Security.Protocol.Ntlm/Type2Message.cs

   1 //
   2 // Mono.Security.Protocol.Ntlm.Type2Message - Challenge
   3 //
   4 // Author:
   5 //      Sebastien Pouliot <sebastien@ximian.com>
   6 //      Atsushi Enomoto <atsushi@ximian.com>
   7 //
   8 // Copyright (C) 2003 Motus Technologies Inc. (http://www.motus.com)
   9 // Copyright (C) 2004, 2007 Novell, Inc (http://www.novell.com)
  10 //
  11 // References
  12 // a.   NTLM Authentication Scheme for HTTP, Ronald Tschalär
  13 //      http://www.innovation.ch/java/ntlm.html
  14 // b.   The NTLM Authentication Protocol, Copyright © 2003 Eric Glass
  15 //      http://davenport.sourceforge.net/ntlm.html
  16 //
  17 // Permission is hereby granted, free of charge, to any person obtaining
  18 // a copy of this software and associated documentation files (the
  19 // "Software"), to deal in the Software without restriction, including
  20 // without limitation the rights to use, copy, modify, merge, publish,
  21 // distribute, sublicense, and/or sell copies of the Software, and to
  22 // permit persons to whom the Software is furnished to do so, subject to
  23 // the following conditions:
  24 //
  25 // The above copyright notice and this permission notice shall be
  26 // included in all copies or substantial portions of the Software.
  27 //
  28 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  29 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  30 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  31 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  32 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  33 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  34 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  35 //
  36
  37 using System;
  38 using System.Security.Cryptography;
  39 using System.Text;
  40
  41 namespace Mono.Security.Protocol.Ntlm {
  42
  43         public class Type2Message : MessageBase {
  44
  45                 private byte[] _nonce;
  46                 private byte[] _context;
  47                 private NtlmTargetInformation _target;
  48                 private string _target_name;
  49
  50                 public Type2Message () : this (NtlmVersion.Version1)
  51                 {
  52                 }
  53
  54                 public Type2Message (NtlmVersion version) : base (2, version)
  55                 {
  56                         _nonce = new byte [8];
  57                         RandomNumberGenerator rng = RandomNumberGenerator.Create ();
  58                         rng.GetBytes (_nonce);
  59                         // default values
  60                         Flags = (NtlmFlags) 0x8201;
  61                         if (Version != NtlmVersion.Version1) {
  62                                 _context = new byte [8];
  63                                 _target = new NtlmTargetInformation ();
  64                         }
  65                 }
  66
  67                 public Type2Message (byte[] message) : this (message, NtlmVersion.Version1)
  68                 {
  69                 }
  70
  71                 public Type2Message (byte[] message, NtlmVersion version) : base (2, version)
  72                 {
  73                         _nonce = new byte [8];
  74                         Decode (message);
  75                 }
  76
  77                 ~Type2Message ()
  78                 {
  79                         if (_nonce != null)
  80                                 Array.Clear (_nonce, 0, _nonce.Length);
  81                 }
  82
  83                 // properties
  84
  85                 public byte[] Context {
  86                         get { return (byte[]) _context.Clone (); }
  87                         set {
  88                                 if (value == null)
  89                                         throw new ArgumentNullException ("Nonce");
  90                                 if (value.Length != 8) {
  91                                         string msg = Locale.GetText ("Invalid Nonce Length (should be 8 bytes).");
  92                                         throw new ArgumentException (msg, "Nonce");
  93                                 }
  94                                 _context = (byte[]) value.Clone ();
  95                         }
  96                 }
  97
  98                 public byte[] Nonce {
  99                         get { return (byte[]) _nonce.Clone (); }
 100                         set {
 101                                 if (value == null)
 102                                         throw new ArgumentNullException ("Nonce");
 103                                 if (value.Length != 8) {
 104                                         string msg = Locale.GetText ("Invalid Nonce Length (should be 8 bytes).");
 105                                         throw new ArgumentException (msg, "Nonce");
 106                                 }
 107                                 _nonce = (byte[]) value.Clone ();
 108                         }
 109                 }
 110
 111                 public NtlmTargetInformation Target {
 112                         get { return _target; }
 113                 }
 114
 115                 public string TargetName {
 116                         get { return _target_name; }
 117                         set { _target_name = value; }
 118                 }
 119
 120                 // methods
 121
 122                 protected override void Decode (byte[] message)
 123                 {
 124                         base.Decode (message);
 125
 126                         short targetNameSize = BitConverterLE.ToInt16 (message, 12);
 127                         int targetNameOffset = BitConverterLE.ToInt32 (message, 16);
 128
 129                         Flags = (NtlmFlags) BitConverterLE.ToUInt32 (message, 20);
 130
 131                         Buffer.BlockCopy (message, 24, _nonce, 0, 8);
 132
 133                         if (Version == NtlmVersion.Version1)
 134                                 return;
 135
 136                         Buffer.BlockCopy (message, 32, _context, 0, 8);
 137                         short targetInfoSize = BitConverterLE.ToInt16 (message, 40);
 138                         int targetInfoOffset = BitConverterLE.ToInt32 (message, 44);
 139
 140                         if (Version == NtlmVersion.Version3)
 141                                 Buffer.BlockCopy (OSVersion, 0, message, 48, OSVersion.Length);
 142
 143                         Encoding enc = (Flags & NtlmFlags.NegotiateUnicode) != 0 ? Encoding.Unicode : Encoding.UTF8;
 144                         if (targetNameSize > 0)
 145                                 TargetName = enc.GetString (message, targetNameOffset, targetNameSize);
 146
 147                         _target.Decode (message, targetInfoOffset, targetInfoSize);
 148                 }
 149
 150                 public override byte[] GetBytes ()
 151                 {
 152                         byte [] name_bytes = null, target = null;
 153                         short name_len = 0, target_len = 0;
 154                         if (TargetName != null) {
 155                                 Encoding enc = (Flags & NtlmFlags.NegotiateUnicode) != 0 ? Encoding.Unicode : Encoding.UTF8;
 156                                 name_bytes = enc.GetBytes (TargetName);
 157                                 name_len = (short) name_bytes.Length;
 158                         }
 159                         if (Version != NtlmVersion.Version1) {
 160                                 target = _target.ToBytes ();
 161                                 target_len = (short) target.Length;
 162                         }
 163
 164                         uint name_offset = (uint) (Version == NtlmVersion.Version3 ? 56 : 40);
 165
 166                         int size = (int) name_offset +
 167                                    (name_len > 0 ? name_len + 8 : 0) +
 168                                    (target_len > 0 ? target_len + 8 : 0);
 169                         byte[] data = PrepareMessage (size);
 170
 171                         // target name
 172                         data [12] = (byte) name_len;
 173                         data [13] = (byte) (name_len >> 8);
 174                         data [14] = data [12];
 175                         data [15] = data [13];
 176                         data [16] = (byte) name_offset;
 177                         data [17] = (byte) (name_offset >> 8);
 178                         data [18] = (byte) (name_offset >> 16);
 179                         data [19] = (byte) (name_offset >> 24);
 180
 181                         // flags
 182                         data [20] = (byte) Flags;
 183                         data [21] = (byte)((uint)Flags >> 8);
 184                         data [22] = (byte)((uint)Flags >> 16);
 185                         data [23] = (byte)((uint)Flags >> 24);
 186
 187                         Buffer.BlockCopy (_nonce, 0, data, 24, _nonce.Length);
 188
 189                         if (Version == NtlmVersion.Version1)
 190                                 return data;
 191
 192                         // context
 193                         Buffer.BlockCopy (_context, 0, data, 32, 8);
 194
 195                         // target information
 196                         data [40] = (byte) target_len;
 197                         data [41] = (byte) (target_len >> 8);
 198                         data [42] = data [40];
 199                         data [43] = data [41];
 200                         uint info_offset = (uint) (name_offset + name_bytes.Length);
 201                         data [44] = (byte) info_offset;
 202                         data [45] = (byte) (info_offset >> 8);
 203                         data [46] = (byte) (info_offset >> 16);
 204                         data [47] = (byte) (info_offset >> 24);
 205
 206                         if (Version == NtlmVersion.Version3)
 207                                 Buffer.BlockCopy (OSVersion, 0, data, 48, OSVersion.Length);
 208
 209                         Buffer.BlockCopy (name_bytes, 0, data, (int) name_offset, name_len);
 210                         Buffer.BlockCopy (target, 0, data, (int) info_offset, target.Length);
 211
 212                         return data;
 213                 }
 214         }
 215 }