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// Transport Security Layer (TLS)
// Copyright (c) 2003-2004 Carlos Guzman Alvarez
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Globalization;
using System.IO;
using Mono.Security.Protocol.Tls.Handshake;
using Mono.Security.Protocol.Tls.Handshake.Client;
namespace Mono.Security.Protocol.Tls
{
internal class ClientRecordProtocol : RecordProtocol
{
#region Constructors
public ClientRecordProtocol(
Stream innerStream,
ClientContext context) : base(innerStream, context)
{
}
#endregion
#region Send Messages
public override HandshakeMessage GetMessage(HandshakeType type)
{
HandshakeMessage msg = this.createClientHandshakeMessage(type);
return msg;
}
#endregion
#region Handshake Processing Methods
protected override void ProcessHandshakeMessage(TlsStream handMsg)
{
HandshakeType handshakeType = (HandshakeType)handMsg.ReadByte();
HandshakeMessage message = null;
DebugHelper.WriteLine(">>>> Processing Handshake record ({0})", handshakeType);
// Read message length
int length = handMsg.ReadInt24();
// Read message data
byte[] data = null;
if (length > 0)
{
data = new byte[length];
handMsg.Read (data, 0, length);
}
// Create and process the server message
message = this.createServerHandshakeMessage(handshakeType, data);
if (message != null)
{
message.Process();
}
// Update the last handshake message
this.Context.LastHandshakeMsg = handshakeType;
// Update session
if (message != null)
{
message.Update();
this.Context.HandshakeMessages.WriteByte ((byte) handshakeType);
this.Context.HandshakeMessages.WriteInt24 (length);
if (length > 0)
{
this.Context.HandshakeMessages.Write (data, 0, data.Length);
}
}
}
#endregion
#region Client Handshake Message Factories
private HandshakeMessage createClientHandshakeMessage(HandshakeType type)
{
switch (type)
{
case HandshakeType.ClientHello:
return new TlsClientHello(this.context);
case HandshakeType.Certificate:
return new TlsClientCertificate(this.context);
case HandshakeType.ClientKeyExchange:
return new TlsClientKeyExchange(this.context);
case HandshakeType.CertificateVerify:
return new TlsClientCertificateVerify(this.context);
case HandshakeType.Finished:
return new TlsClientFinished(this.context);
default:
throw new InvalidOperationException("Unknown client handshake message type: " + type.ToString() );
}
}
private HandshakeMessage createServerHandshakeMessage(
HandshakeType type, byte[] buffer)
{
ClientContext context = (ClientContext)this.context;
switch (type)
{
case HandshakeType.HelloRequest:
if (context.HandshakeState != HandshakeState.Started)
{
context.HandshakeState = HandshakeState.None;
// re-negotiation will occur at next read/write
// (i.e. not during an existing encode/decode op)
}
else
{
this.SendAlert(
AlertLevel.Warning,
AlertDescription.NoRenegotiation);
}
return null;
case HandshakeType.ServerHello:
return new TlsServerHello(this.context, buffer);
case HandshakeType.Certificate:
return new TlsServerCertificate(this.context, buffer);
case HandshakeType.ServerKeyExchange:
return new TlsServerKeyExchange(this.context, buffer);
case HandshakeType.CertificateRequest:
return new TlsServerCertificateRequest(this.context, buffer);
case HandshakeType.ServerHelloDone:
return new TlsServerHelloDone(this.context, buffer);
case HandshakeType.Finished:
return new TlsServerFinished(this.context, buffer);
default:
throw new TlsException(
AlertDescription.UnexpectedMessage,
String.Format(CultureInfo.CurrentUICulture,
"Unknown server handshake message received ({0})",
type.ToString()));
}
}
#endregion
}
}
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