mcs/class/Mono.Security/Mono.Security.Protocol.Tls.Handshake.Client/TlsClientHello.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.Security.Cryptography;
  27
  28 namespace Mono.Security.Protocol.Tls.Handshake.Client
  29 {
  30         internal class TlsClientHello : HandshakeMessage
  31         {
  32                 #region Fields
  33
  34                 private byte[] random;
  35
  36                 #endregion
  37
  38                 #region Constructors
  39
  40                 public TlsClientHello(Context context)
  41                         : base(context, HandshakeType.ClientHello)
  42                 {
  43                 }
  44
  45                 #endregion
  46
  47                 #region Methods
  48
  49                 public override void Update()
  50                 {
  51                         ClientContext context = (ClientContext)this.Context;
  52
  53                         base.Update();
  54
  55                         context.ClientRandom            = random;
  56                         context.ClientHelloProtocol     = this.Context.Protocol;
  57
  58                         random = null;
  59                 }
  60
  61                 #endregion
  62
  63                 #region Protected Methods
  64
  65                 protected override void ProcessAsSsl3()
  66                 {
  67                         this.ProcessAsTls1();
  68                 }
  69
  70                 protected override void ProcessAsTls1()
  71                 {
  72                         // Client Version
  73                         this.Write(this.Context.Protocol);
  74
  75                         // Random bytes - Unix time + Radom bytes [28]
  76                         TlsStream clientRandom = new TlsStream();
  77                         clientRandom.Write(this.Context.GetUnixTime());
  78                         clientRandom.Write(this.Context.GetSecureRandomBytes(28));
  79                         this.random = clientRandom.ToArray();
  80                         clientRandom.Reset();
  81
  82                         this.Write(this.random);
  83
  84                         // Session id
  85                         // Check if we have a cache session we could reuse
  86                         this.Context.SessionId = ClientSessionCache.FromHost (this.Context.ClientSettings.TargetHost);
  87                         if (this.Context.SessionId != null)
  88                         {
  89                                 this.Write((byte)this.Context.SessionId.Length);
  90                                 if (this.Context.SessionId.Length > 0)
  91                                 {
  92                                         this.Write(this.Context.SessionId);
  93                                 }
  94                         }
  95                         else
  96                         {
  97                                 this.Write((byte)0);
  98                         }
  99
 100                         // Write length of Cipher suites
 101                         this.Write((short)(this.Context.SupportedCiphers.Count*2));
 102
 103                         // Write Supported Cipher suites
 104                         for (int i = 0; i < this.Context.SupportedCiphers.Count; i++)
 105                         {
 106                                 this.Write((short)this.Context.SupportedCiphers[i].Code);
 107                         }
 108
 109                         // Compression methods length
 110                         this.Write((byte)1);
 111
 112                         // Compression methods ( 0 = none )
 113                         this.Write((byte)this.Context.CompressionMethod);
 114
 115                         // http://www.ietf.org/rfc/rfc3546.txt
 116                         TlsStream extensions = new TlsStream ();
 117                         byte[] server_name = System.Text.Encoding.UTF8.GetBytes (Context.ClientSettings.TargetHost);
 118                         extensions.Write ((short) 0x0000);                      // ExtensionType: server_name (0)
 119                         extensions.Write ((short) (server_name.Length + 5));    // ServerNameList (length)
 120                         extensions.Write ((short) (server_name.Length + 3));    // ServerName (length)
 121                         extensions.Write ((byte) 0x00);                         // NameType: host_name (0)
 122                         extensions.Write ((short) server_name.Length);          // HostName (length)
 123                         extensions.Write (server_name);                         // HostName (UTF8)
 124                         this.Write ((short) extensions.Length);
 125                         this.Write (extensions.ToArray ());
 126                 }
 127
 128                 #endregion
 129         }
 130 }