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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.Server;
namespace Mono.Security.Protocol.Tls
{
internal class ServerRecordProtocol : RecordProtocol
{
TlsClientCertificate cert;
#region Constructors
public ServerRecordProtocol(
Stream innerStream,
ServerContext context) : base(innerStream, context)
{
}
#endregion
#region Send Messages
public override HandshakeMessage GetMessage(HandshakeType type)
{
// Create and process the record message
HandshakeMessage msg = this.createServerHandshakeMessage(type);
return msg;
}
#endregion
#region Handshake Processing Methods
protected override void ProcessHandshakeMessage(TlsStream handMsg)
{
HandshakeType handshakeType = (HandshakeType)handMsg.ReadByte();
HandshakeMessage message = null;
// Read message length
int length = handMsg.ReadInt24();
// Read message data
byte[] data = new byte[length];
handMsg.Read(data, 0, length);
// Create and process the server message
message = this.createClientHandshakeMessage(handshakeType, data);
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);
this.Context.HandshakeMessages.Write (data, 0, data.Length);
}
}
#endregion
#region Server Handshake Message Factories
private HandshakeMessage createClientHandshakeMessage(
HandshakeType type, byte[] buffer)
{
var last = context.LastHandshakeMsg;
switch (type)
{
case HandshakeType.ClientHello:
return new TlsClientHello(this.context, buffer);
case HandshakeType.Certificate:
if (last != HandshakeType.ClientHello)
break;
cert = new TlsClientCertificate(this.context, buffer);
return cert;
case HandshakeType.ClientKeyExchange:
if (last == HandshakeType.ClientHello || last == HandshakeType.Certificate)
return new TlsClientKeyExchange(this.context, buffer);
break;
case HandshakeType.CertificateVerify:
if (last == HandshakeType.ClientKeyExchange && cert != null)
return new TlsClientCertificateVerify(this.context, buffer);
break;
case HandshakeType.Finished:
// Certificates are optional, but if provided, they should send a CertificateVerify
bool hasCert = cert != null && cert.HasCertificate;
bool check = hasCert ? (last == HandshakeType.CertificateVerify) : (last == HandshakeType.ClientKeyExchange);
// ChangeCipherSpecDone is not an handshake message (it's a content type) but still needs to be happens before finished
if (check && context.ChangeCipherSpecDone) {
context.ChangeCipherSpecDone = false;
return new TlsClientFinished(this.context, buffer);
}
break;
default:
throw new TlsException(AlertDescription.UnexpectedMessage, String.Format(CultureInfo.CurrentUICulture,
"Unknown server handshake message received ({0})",
type.ToString()));
}
throw new TlsException (AlertDescription.HandshakeFailiure, String.Format ("Protocol error, unexpected protocol transition from {0} to {1}", last, type));
}
private HandshakeMessage createServerHandshakeMessage(
HandshakeType type)
{
switch (type)
{
case HandshakeType.HelloRequest:
this.SendRecord(HandshakeType.ClientHello);
return null;
case HandshakeType.ServerHello:
return new TlsServerHello(this.context);
case HandshakeType.Certificate:
return new TlsServerCertificate(this.context);
case HandshakeType.ServerKeyExchange:
return new TlsServerKeyExchange(this.context);
case HandshakeType.CertificateRequest:
return new TlsServerCertificateRequest(this.context);
case HandshakeType.ServerHelloDone:
return new TlsServerHelloDone(this.context);
case HandshakeType.Finished:
return new TlsServerFinished(this.context);
default:
throw new InvalidOperationException("Unknown server handshake message type: " + type.ToString() );
}
}
#endregion
}
}
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