mcs/class/Mono.Security/Mono.Security.Protocol.Tls/ClientRecordProtocol.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.Client;
  31
  32 namespace Mono.Security.Protocol.Tls
  33 {
  34         internal class ClientRecordProtocol : RecordProtocol
  35         {
  36                 #region Constructors
  37
  38                 public ClientRecordProtocol(
  39                         Stream                  innerStream,
  40                         ClientContext   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 and process the record message
  51                         HandshakeMessage msg = this.createClientHandshakeMessage(type);
  52                         msg.Process();
  53
  54                         DebugHelper.WriteLine(">>>> Write handshake record ({0}|{1})", context.Protocol, msg.ContentType);
  55
  56                         // Write record
  57                         this.SendRecord(msg.ContentType, msg.EncodeMessage());
  58
  59                         // Update session
  60                         msg.Update();
  61
  62                         // Reset message contents
  63                         msg.Reset();
  64                 }
  65
  66                 #endregion
  67
  68                 #region Handshake Processing Methods
  69
  70                 protected override void ProcessChangeCipherSpec()
  71                 {
  72                         // Reset sequence numbers
  73                         this.context.ReadSequenceNumber = 0;
  74                 }
  75
  76                 protected override void ProcessHandshakeMessage(TlsStream handMsg)
  77                 {
  78                         HandshakeType           handshakeType   = (HandshakeType)handMsg.ReadByte();
  79                         HandshakeMessage        message                 = null;
  80
  81                         DebugHelper.WriteLine(">>>> Processing Handshake record ({0})", handshakeType);
  82
  83                         // Read message length
  84                         int length = handMsg.ReadInt24();
  85
  86                         // Read message data
  87                         byte[] data = new byte[length];
  88                         handMsg.Read(data, 0, length);
  89
  90                         // Create and process the server message
  91                         message = this.createServerHandshakeMessage(handshakeType, data);
  92                         message.Process();
  93
  94                         // Update the last handshake message
  95                         this.Context.LastHandshakeMsg = handshakeType;
  96
  97                         // Update session
  98                         if (message != null)
  99                         {
 100                                 message.Update();
 101                         }
 102                 }
 103
 104                 #endregion
 105
 106                 #region Client Handshake Message Factories
 107
 108                 private HandshakeMessage createClientHandshakeMessage(HandshakeType type)
 109                 {
 110                         switch (type)
 111                         {
 112                                 case HandshakeType.ClientHello:
 113                                         return new TlsClientHello(this.context);
 114
 115                                 case HandshakeType.Certificate:
 116                                         return new TlsClientCertificate(this.context);
 117
 118                                 case HandshakeType.ClientKeyExchange:
 119                                         return new TlsClientKeyExchange(this.context);
 120
 121                                 case HandshakeType.CertificateVerify:
 122                                         return new TlsClientCertificateVerify(this.context);
 123
 124                                 case HandshakeType.Finished:
 125                                         return new TlsClientFinished(this.context);
 126
 127                                 default:
 128                                         throw new InvalidOperationException("Unknown client handshake message type: " + type.ToString() );
 129                         }
 130                 }
 131
 132                 private HandshakeMessage createServerHandshakeMessage(
 133                         HandshakeType type, byte[] buffer)
 134                 {
 135                         ClientContext context = (ClientContext)this.context;
 136
 137                         switch (type)
 138                         {
 139                                 case HandshakeType.HelloRequest:
 140                                         if (context.HandshakeState != HandshakeState.Started)
 141                                         {
 142                                                 context.SslStream.NegotiateHandshake();
 143                                         }
 144                                         else
 145                                         {
 146                                                 this.SendAlert(
 147                                                         AlertLevel.Warning,
 148                                                         AlertDescription.NoRenegotiation);
 149                                         }
 150                                         return null;
 151
 152                                 case HandshakeType.ServerHello:
 153                                         return new TlsServerHello(this.context, buffer);
 154
 155                                 case HandshakeType.Certificate:
 156                                         return new TlsServerCertificate(this.context, buffer);
 157
 158                                 case HandshakeType.ServerKeyExchange:
 159                                         return new TlsServerKeyExchange(this.context, buffer);
 160
 161                                 case HandshakeType.CertificateRequest:
 162                                         return new TlsServerCertificateRequest(this.context, buffer);
 163
 164                                 case HandshakeType.ServerHelloDone:
 165                                         return new TlsServerHelloDone(this.context, buffer);
 166
 167                                 case HandshakeType.Finished:
 168                                         return new TlsServerFinished(this.context, buffer);
 169
 170                                 default:
 171                                         throw new TlsException(
 172                                                 AlertDescription.UnexpectedMessage,
 173                                                 String.Format(CultureInfo.CurrentUICulture,
 174                                                         "Unknown server handshake message received ({0})",
 175                                                         type.ToString()));
 176                         }
 177                 }
 178
 179                 #endregion
 180         }
 181 }