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 HandshakeMessage GetMessage(HandshakeType type)
  49                 {
  50                         HandshakeMessage msg = this.createClientHandshakeMessage(type);
  51
  52                         return msg;
  53                 }
  54
  55                 #endregion
  56
  57                 #region Handshake Processing Methods
  58
  59                 protected override void ProcessHandshakeMessage(TlsStream handMsg)
  60                 {
  61                         HandshakeType           handshakeType   = (HandshakeType)handMsg.ReadByte();
  62                         HandshakeMessage        message                 = null;
  63
  64                         DebugHelper.WriteLine(">>>> Processing Handshake record ({0})", handshakeType);
  65
  66                         // Read message length
  67                         int length = handMsg.ReadInt24();
  68
  69                         // Read message data
  70                         byte[] data = null;
  71                         if (length > 0)
  72                         {
  73                                 data = new byte[length];
  74                                 handMsg.Read (data, 0, length);
  75                         }
  76
  77                         // Create and process the server message
  78                         message = this.createServerHandshakeMessage(handshakeType, data);
  79                         if (message != null)
  80                         {
  81                                 message.Process();
  82                         }
  83
  84                         // Update the last handshake message
  85                         this.Context.LastHandshakeMsg = handshakeType;
  86
  87                         // Update session
  88                         if (message != null)
  89                         {
  90                                 message.Update();
  91                                 this.Context.HandshakeMessages.WriteByte ((byte) handshakeType);
  92                                 this.Context.HandshakeMessages.WriteInt24 (length);
  93                                 if (length > 0)
  94                                 {
  95                                         this.Context.HandshakeMessages.Write (data, 0, data.Length);
  96                                 }
  97                         }
  98                 }
  99
 100                 #endregion
 101
 102                 #region Client Handshake Message Factories
 103
 104                 private HandshakeMessage createClientHandshakeMessage(HandshakeType type)
 105                 {
 106                         switch (type)
 107                         {
 108                                 case HandshakeType.ClientHello:
 109                                         return new TlsClientHello(this.context);
 110
 111                                 case HandshakeType.Certificate:
 112                                         return new TlsClientCertificate(this.context);
 113
 114                                 case HandshakeType.ClientKeyExchange:
 115                                         return new TlsClientKeyExchange(this.context);
 116
 117                                 case HandshakeType.CertificateVerify:
 118                                         return new TlsClientCertificateVerify(this.context);
 119
 120                                 case HandshakeType.Finished:
 121                                         return new TlsClientFinished(this.context);
 122
 123                                 default:
 124                                         throw new InvalidOperationException("Unknown client handshake message type: " + type.ToString() );
 125                         }
 126                 }
 127
 128                 private HandshakeMessage createServerHandshakeMessage(
 129                         HandshakeType type, byte[] buffer)
 130                 {
 131                         ClientContext context = (ClientContext)this.context;
 132
 133                         switch (type)
 134                         {
 135                                 case HandshakeType.HelloRequest:
 136                                         if (context.HandshakeState != HandshakeState.Started)
 137                                         {
 138                                                 context.HandshakeState = HandshakeState.None;
 139                                                 // re-negotiation will occur at next read/write
 140                                                 // (i.e. not during an existing encode/decode op)
 141                                         }
 142                                         else
 143                                         {
 144                                                 this.SendAlert(
 145                                                         AlertLevel.Warning,
 146                                                         AlertDescription.NoRenegotiation);
 147                                         }
 148                                         return null;
 149
 150                                 case HandshakeType.ServerHello:
 151                                         return new TlsServerHello(this.context, buffer);
 152
 153                                 case HandshakeType.Certificate:
 154                                         return new TlsServerCertificate(this.context, buffer);
 155
 156                                 case HandshakeType.ServerKeyExchange:
 157                                         return new TlsServerKeyExchange(this.context, buffer);
 158
 159                                 case HandshakeType.CertificateRequest:
 160                                         return new TlsServerCertificateRequest(this.context, buffer);
 161
 162                                 case HandshakeType.ServerHelloDone:
 163                                         return new TlsServerHelloDone(this.context, buffer);
 164
 165                                 case HandshakeType.Finished:
 166                                         return new TlsServerFinished(this.context, buffer);
 167
 168                                 default:
 169                                         throw new TlsException(
 170                                                 AlertDescription.UnexpectedMessage,
 171                                                 String.Format(CultureInfo.CurrentUICulture,
 172                                                         "Unknown server handshake message received ({0})",
 173                                                         type.ToString()));
 174                         }
 175                 }
 176
 177                 #endregion
 178         }
 179 }