mcs/class/Mono.Security/Mono.Security.Protocol.Tls.Handshake.Client/TlsServerHello.cs

   1 /* Transport Security Layer (TLS)
   2  * Copyright (c) 2003 Carlos Guzmán Álvarez
   3  *
   4  * Permission is hereby granted, free of charge, to any person
   5  * obtaining a copy of this software and associated documentation
   6  * files (the "Software"), to deal in the Software without restriction,
   7  * including without limitation the rights to use, copy, modify, merge,
   8  * publish, distribute, sublicense, and/or sell copies of the Software,
   9  * and to permit persons to whom the Software is furnished to do so,
  10  * subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included
  13  * in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
  17  * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  19  * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  20  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 using System;
  26
  27 namespace Mono.Security.Protocol.Tls.Handshake.Client
  28 {
  29         internal class TlsServerHello : TlsHandshakeMessage
  30         {
  31                 #region FIELDS
  32
  33                 private SecurityProtocolType    protocol;
  34                 private SecurityCompressionType compressionMethod;
  35                 private byte[]                                  random;
  36                 private byte[]                                  sessionId;
  37                 private CipherSuite     cipherSuite;
  38
  39                 #endregion
  40
  41                 #region CONSTRUCTORS
  42
  43                 public TlsServerHello(TlsContext context, byte[] buffer)
  44                         : base(context, TlsHandshakeType.ServerHello, buffer)
  45                 {
  46                 }
  47
  48                 #endregion
  49
  50                 #region METHODS
  51
  52                 public override void UpdateSession()
  53                 {
  54                         base.UpdateSession();
  55
  56                         this.Context.SessionId                  = this.sessionId;
  57                         this.Context.ServerRandom               = this.random;
  58                         this.Context.Cipher                             = this.cipherSuite;
  59                         this.Context.CompressionMethod  = this.compressionMethod;
  60                         this.Context.Cipher.Context             = this.Context;
  61
  62                         // Compute ClientRandom + ServerRandom
  63                         TlsStream random = new TlsStream();
  64                         random.Write(this.Context.ClientRandom);
  65                         random.Write(this.Context.ServerRandom);
  66                         this.Context.RandomCS = random.ToArray();
  67
  68                         // Server Random + Client Random
  69                         random.Reset();
  70                         random.Write(this.Context.ServerRandom);
  71                         random.Write(this.Context.ClientRandom);
  72
  73                         this.Context.RandomSC = random.ToArray();
  74                         random.Reset();
  75                 }
  76
  77                 #endregion
  78
  79                 #region PROTECTED_METHODS
  80
  81                 protected override void ProcessAsSsl3()
  82                 {
  83                         // Read protocol version
  84                         this.protocol   = (SecurityProtocolType)this.ReadInt16();
  85
  86                         // Read random  - Unix time + Random bytes
  87                         this.random             = this.ReadBytes(32);
  88
  89                         // Read Session id
  90                         int length = (int)ReadByte();
  91                         if (length > 0)
  92                         {
  93                                 this.sessionId = this.ReadBytes(length);
  94                         }
  95
  96                         // Read cipher suite
  97                         short cipherCode = this.ReadInt16();
  98                         if (this.Context.SupportedCiphers.IndexOf(cipherCode) == -1)
  99                         {
 100                                 // The server has sent an invalid ciphersuite
 101                                 throw new TlsException("Invalid cipher suite received from server");
 102                         }
 103                         this.cipherSuite = this.Context.SupportedCiphers[cipherCode];
 104
 105                         // Read compression methods ( always 0 )
 106                         this.compressionMethod = (SecurityCompressionType)this.ReadByte();
 107                 }
 108
 109                 protected override void ProcessAsTls1()
 110                 {
 111                         // Read protocol version
 112                         this.protocol   = (SecurityProtocolType)this.ReadInt16();
 113
 114                         // Read random  - Unix time + Random bytes
 115                         this.random             = this.ReadBytes(32);
 116
 117                         // Read Session id
 118                         int length = (int)ReadByte();
 119                         if (length > 0)
 120                         {
 121                                 this.sessionId = this.ReadBytes(length);
 122                         }
 123
 124                         // Read cipher suite
 125                         short cipherCode = this.ReadInt16();
 126                         if (this.Context.SupportedCiphers.IndexOf(cipherCode) == -1)
 127                         {
 128                                 // The server has sent an invalid ciphersuite
 129                                 throw new TlsException("Invalid cipher suite received from server");
 130                         }
 131                         this.cipherSuite = this.Context.SupportedCiphers[cipherCode];
 132
 133                         // Read compression methods ( always 0 )
 134                         this.compressionMethod = (SecurityCompressionType)this.ReadByte();
 135                 }
 136
 137                 #endregion
 138         }
 139 }