mcs/class/Mono.Security/Mono.Security.Protocol.Tls/ServerRecordProtocol.cs

   1 // Transport Security Layer (TLS)
   2 // Copyright (c) 2003-2004 Carlos Guzman Alvarez
   3
   4 //
   5 // Permission is hereby granted, free of charge, to any person obtaining
   6 // a copy of this software and associated documentation files (the
   7 // "Software"), to deal in the Software without restriction, including
   8 // without limitation the rights to use, copy, modify, merge, publish,
   9 // distribute, sublicense, and/or sell copies of the Software, and to
  10 // permit persons to whom the Software is furnished to do so, subject to
  11 // the following conditions:
  12 //
  13 // The above copyright notice and this permission notice shall be
  14 // included in all copies or substantial portions of the Software.
  15 //
  16 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  17 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  18 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  19 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  20 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  21 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  22 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23 //
  24
  25 using System;
  26 using System.Globalization;
  27 using System.IO;
  28
  29 using Mono.Security.Protocol.Tls.Handshake;
  30 using Mono.Security.Protocol.Tls.Handshake.Server;
  31
  32 namespace Mono.Security.Protocol.Tls
  33 {
  34         internal class ServerRecordProtocol : RecordProtocol
  35         {
  36                 #region Constructors
  37
  38                 public ServerRecordProtocol(
  39                         Stream                  innerStream,
  40                         ServerContext   context) : base(innerStream, context)
  41                 {
  42                 }
  43
  44                 #endregion
  45
  46                 #region Send Messages
  47
  48                 public override void SendRecord(HandshakeType type)
  49                 {
  50                         // Create the record message
  51                         HandshakeMessage msg = this.createServerHandshakeMessage(type);
  52                         msg.Process();
  53
  54                         // Write record
  55                         this.SendRecord(msg.ContentType, msg.EncodeMessage());
  56
  57                         // Update session
  58                         msg.Update();
  59
  60                         // Reset message contents
  61                         msg.Reset();
  62                 }
  63
  64                 #endregion
  65
  66                 #region Handshake Processing Methods
  67
  68                 protected override void ProcessChangeCipherSpec()
  69                 {
  70                         // Reset sequence numbers
  71                         this.context.ReadSequenceNumber = 0;
  72
  73                         // Make the pending state to be the current state
  74                         this.context.IsActual = true;
  75                 }
  76
  77                 protected override void ProcessHandshakeMessage(TlsStream handMsg)
  78                 {
  79                         HandshakeType           handshakeType   = (HandshakeType)handMsg.ReadByte();
  80                         HandshakeMessage        message                 = null;
  81
  82                         // Read message length
  83                         int length = handMsg.ReadInt24();
  84
  85                         // Read message data
  86                         byte[] data = new byte[length];
  87                         handMsg.Read(data, 0, length);
  88
  89                         // Create and process the server message
  90                         message = this.createClientHandshakeMessage(handshakeType, data);
  91                         message.Process();
  92
  93                         // Update the last handshake message
  94                         this.Context.LastHandshakeMsg = handshakeType;
  95
  96                         // Update session
  97                         if (message != null)
  98                         {
  99                                 message.Update();
 100                         }
 101                 }
 102
 103                 #endregion
 104
 105                 #region Server Handshake Message Factories
 106
 107                 private HandshakeMessage createClientHandshakeMessage(
 108                         HandshakeType type, byte[] buffer)
 109                 {
 110                         switch (type)
 111                         {
 112                                 case HandshakeType.ClientHello:
 113                                         return new TlsClientHello(this.context, buffer);
 114
 115                                 case HandshakeType.Certificate:
 116                                         return new TlsClientCertificate(this.context, buffer);
 117
 118                                 case HandshakeType.ClientKeyExchange:
 119                                         return new TlsClientKeyExchange(this.context, buffer);
 120
 121                                 case HandshakeType.CertificateVerify:
 122                                         return new TlsClientCertificateVerify(this.context, buffer);
 123
 124                                 case HandshakeType.Finished:
 125                                         return new TlsClientFinished(this.context, buffer);
 126
 127                                 default:
 128                                         throw new TlsException(
 129                                                 AlertDescription.UnexpectedMessage,
 130                                                 String.Format(CultureInfo.CurrentUICulture,
 131                                                         "Unknown server handshake message received ({0})",
 132                                                         type.ToString()));
 133                         }
 134                 }
 135
 136                 private HandshakeMessage createServerHandshakeMessage(
 137                         HandshakeType type)
 138                 {
 139                         switch (type)
 140                         {
 141                                 case HandshakeType.HelloRequest:
 142                                         this.SendRecord(HandshakeType.ClientHello);
 143                                         return null;
 144
 145                                 case HandshakeType.ServerHello:
 146                                         return new TlsServerHello(this.context);
 147
 148                                 case HandshakeType.Certificate:
 149                                         return new TlsServerCertificate(this.context);
 150
 151                                 case HandshakeType.ServerKeyExchange:
 152                                         return new TlsServerKeyExchange(this.context);
 153
 154                                 case HandshakeType.CertificateRequest:
 155                                         return new TlsServerCertificateRequest(this.context);
 156
 157                                 case HandshakeType.ServerHelloDone:
 158                                         return new TlsServerHelloDone(this.context);
 159
 160                                 case HandshakeType.Finished:
 161                                         return new TlsServerFinished(this.context);
 162
 163                                 default:
 164                                         throw new InvalidOperationException("Unknown server handshake message type: " + type.ToString() );
 165                         }
 166                 }
 167
 168                 #endregion
 169         }
 170 }