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 HandshakeMessage GetMessage(HandshakeType type)
  49                 {
  50                         // Create and process the record message
  51                         HandshakeMessage msg = this.createServerHandshakeMessage(type);
  52
  53                         return msg;
  54                 }
  55
  56                 #endregion
  57
  58                 #region Handshake Processing Methods
  59
  60                 protected override void ProcessChangeCipherSpec()
  61                 {
  62                         // Reset sequence numbers
  63                         this.context.ReadSequenceNumber = 0;
  64
  65                         // Make the pending state to be the current state
  66                         this.context.IsActual = true;
  67                 }
  68
  69                 protected override void ProcessHandshakeMessage(TlsStream handMsg)
  70                 {
  71                         HandshakeType           handshakeType   = (HandshakeType)handMsg.ReadByte();
  72                         HandshakeMessage        message                 = null;
  73
  74                         // Read message length
  75                         int length = handMsg.ReadInt24();
  76
  77                         // Read message data
  78                         byte[] data = new byte[length];
  79                         handMsg.Read(data, 0, length);
  80
  81                         // Create and process the server message
  82                         message = this.createClientHandshakeMessage(handshakeType, data);
  83                         message.Process();
  84
  85                         // Update the last handshake message
  86                         this.Context.LastHandshakeMsg = handshakeType;
  87
  88                         // Update session
  89                         if (message != null)
  90                         {
  91                                 message.Update();
  92                                 this.Context.HandshakeMessages.WriteByte ((byte) handshakeType);
  93                                 this.Context.HandshakeMessages.WriteInt24 (length);
  94                                 this.Context.HandshakeMessages.Write (data, 0, data.Length);
  95                         }
  96                 }
  97
  98                 #endregion
  99
 100                 #region Server Handshake Message Factories
 101
 102                 private HandshakeMessage createClientHandshakeMessage(
 103                         HandshakeType type, byte[] buffer)
 104                 {
 105                         switch (type)
 106                         {
 107                                 case HandshakeType.ClientHello:
 108                                         return new TlsClientHello(this.context, buffer);
 109
 110                                 case HandshakeType.Certificate:
 111                                         return new TlsClientCertificate(this.context, buffer);
 112
 113                                 case HandshakeType.ClientKeyExchange:
 114                                         return new TlsClientKeyExchange(this.context, buffer);
 115
 116                                 case HandshakeType.CertificateVerify:
 117                                         return new TlsClientCertificateVerify(this.context, buffer);
 118
 119                                 case HandshakeType.Finished:
 120                                         return new TlsClientFinished(this.context, buffer);
 121
 122                                 default:
 123                                         throw new TlsException(
 124                                                 AlertDescription.UnexpectedMessage,
 125                                                 String.Format(CultureInfo.CurrentUICulture,
 126                                                         "Unknown server handshake message received ({0})",
 127                                                         type.ToString()));
 128                         }
 129                 }
 130
 131                 private HandshakeMessage createServerHandshakeMessage(
 132                         HandshakeType type)
 133                 {
 134                         switch (type)
 135                         {
 136                                 case HandshakeType.HelloRequest:
 137                                         this.SendRecord(HandshakeType.ClientHello);
 138                                         return null;
 139
 140                                 case HandshakeType.ServerHello:
 141                                         return new TlsServerHello(this.context);
 142
 143                                 case HandshakeType.Certificate:
 144                                         return new TlsServerCertificate(this.context);
 145
 146                                 case HandshakeType.ServerKeyExchange:
 147                                         return new TlsServerKeyExchange(this.context);
 148
 149                                 case HandshakeType.CertificateRequest:
 150                                         return new TlsServerCertificateRequest(this.context);
 151
 152                                 case HandshakeType.ServerHelloDone:
 153                                         return new TlsServerHelloDone(this.context);
 154
 155                                 case HandshakeType.Finished:
 156                                         return new TlsServerFinished(this.context);
 157
 158                                 default:
 159                                         throw new InvalidOperationException("Unknown server handshake message type: " + type.ToString() );
 160                         }
 161                 }
 162
 163                 #endregion
 164         }
 165 }