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