mcs/class/Mono.Security/Mono.Security.Protocol.Tls.Handshake/HandshakeMessage.cs

   1 /* Transport Security Layer (TLS)
   2  * Copyright (c) 2003-2004 Carlos Guzman Alvarez
   3  *
   4  * Permission is hereby granted, free of charge, to any person
   5  * obtaining a copy of this software and associated documentation
   6  * files (the "Software"), to deal in the Software without restriction,
   7  * including without limitation the rights to use, copy, modify, merge,
   8  * publish, distribute, sublicense, and/or sell copies of the Software,
   9  * and to permit persons to whom the Software is furnished to do so,
  10  * subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included
  13  * in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
  17  * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  19  * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  20  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 using System;
  26
  27 namespace Mono.Security.Protocol.Tls.Handshake
  28 {
  29         internal abstract class HandshakeMessage : TlsStream
  30         {
  31                 #region Fields
  32
  33                 private Context                 context;
  34                 private HandshakeType   handshakeType;
  35                 private ContentType     contentType;
  36
  37                 #endregion
  38
  39                 #region Properties
  40
  41                 public Context Context
  42                 {
  43                         get { return this.context; }
  44                 }
  45
  46                 public HandshakeType HandshakeType
  47                 {
  48                         get { return this.handshakeType; }
  49                 }
  50
  51                 public ContentType ContentType
  52                 {
  53                         get { return this.contentType; }
  54                 }
  55
  56                 #endregion
  57
  58                 #region Constructors
  59
  60                 public HandshakeMessage(
  61                         Context                 context,
  62                         HandshakeType   handshakeType)
  63                         : this(context, handshakeType, ContentType.Handshake)
  64                 {
  65                 }
  66
  67                 public HandshakeMessage(
  68                         Context                 context,
  69                         HandshakeType   handshakeType,
  70                         ContentType             contentType) : base()
  71                 {
  72                         this.context            = context;
  73                         this.handshakeType      = handshakeType;
  74                         this.contentType        = contentType;
  75                 }
  76
  77                 public HandshakeMessage(
  78                         Context                 context,
  79                         HandshakeType   handshakeType,
  80                         byte[]                  data) : base(data)
  81                 {
  82                         this.context            = context;
  83                         this.handshakeType      = handshakeType;
  84                 }
  85
  86                 #endregion
  87
  88                 #region Abstract Methods
  89
  90                 protected abstract void ProcessAsTls1();
  91
  92                 protected abstract void ProcessAsSsl3();
  93
  94                 #endregion
  95
  96                 #region Methods
  97
  98                 public void Process()
  99                 {
 100                         switch (this.Context.SecurityProtocol)
 101                         {
 102                                 case SecurityProtocolType.Tls:
 103                                 case SecurityProtocolType.Default:
 104                                         this.ProcessAsTls1();
 105                                         break;
 106
 107                                 case SecurityProtocolType.Ssl3:
 108                                         this.ProcessAsSsl3();
 109                                         break;
 110
 111                                 case SecurityProtocolType.Ssl2:
 112                                 default:
 113                                         throw new NotSupportedException("Unsupported security protocol type");
 114                         }
 115                 }
 116
 117                 public virtual void Update()
 118                 {
 119                         if (this.CanWrite)
 120                         {
 121                                 this.context.HandshakeMessages.Write(this.EncodeMessage());
 122                                 this.Reset();
 123                         }
 124                 }
 125
 126                 public virtual byte[] EncodeMessage()
 127                 {
 128                         byte[] result = null;
 129
 130                         if (CanWrite)
 131                         {
 132                                 TlsStream c = new TlsStream();
 133
 134                                 c.Write((byte)HandshakeType);
 135                                 c.WriteInt24((int)this.Length);
 136                                 c.Write(this.ToArray());
 137
 138                                 result = c.ToArray();
 139                         }
 140
 141                         return result;
 142                 }
 143
 144                 #endregion
 145         }
 146 }