internal override void OnNegotiateHandshakeCallback(IAsyncResult asyncResult)
{
this.protocol.EndSendRecord(asyncResult);
while (this.context.LastHandshakeMsg != HandshakeType.ServerHelloDone)
{
this.SafeReceiveRecord(this.innerStream);
if (this.context.AbbreviatedHandshake && this.context.LastHandshakeMsg == HandshakeType.ServerHello)
{
break;
}
}
if (this.context.AbbreviatedHandshake)
{
ClientSessionCache.SetContextFromCache(this.context);
this.context.Negotiating.Cipher.ComputeKeys();
this.context.Negotiating.Cipher.InitializeCipher();
this.protocol.SendChangeCipherSpec();
while (this.context.HandshakeState != HandshakeState.Finished)
{
this.SafeReceiveRecord(this.innerStream);
}
this.protocol.SendRecord(HandshakeType.Finished);
}
else
{
bool flag = this.context.ServerSettings.CertificateRequest;
if (this.context.SecurityProtocol == SecurityProtocolType.Ssl3)
{
flag = (this.context.ClientSettings.Certificates != null && this.context.ClientSettings.Certificates.Count > 0);
}
if (flag)
{
this.protocol.SendRecord(HandshakeType.Certificate);
}
this.protocol.SendRecord(HandshakeType.ClientKeyExchange);
this.context.Negotiating.Cipher.InitializeCipher();
if (flag && this.context.ClientSettings.ClientCertificate != null)
{
this.protocol.SendRecord(HandshakeType.CertificateVerify);
}
this.protocol.SendChangeCipherSpec();
this.protocol.SendRecord(HandshakeType.Finished);
while (this.context.HandshakeState != HandshakeState.Finished)
{
this.SafeReceiveRecord(this.innerStream);
}
}
this.context.HandshakeMessages.Reset();
this.context.ClearKeyInfo();
}
private void NegotiateAsyncWorker(IAsyncResult result)
{
NegotiateAsyncResult negotiate = result.AsyncState as NegotiateAsyncResult;
try
{
switch (negotiate.State)
{
case NegotiateState.SentClientHello:
this.protocol.EndSendRecord(result);
// we are now ready to ready the receive the hello response.
negotiate.State = NegotiateState.ReceiveClientHelloResponse;
// Start reading the client hello response
this.protocol.BeginReceiveRecord(this.innerStream, NegotiateAsyncWorker, negotiate);
break;
case NegotiateState.ReceiveClientHelloResponse:
this.SafeEndReceiveRecord(result, true);
if (this.context.LastHandshakeMsg != HandshakeType.ServerHelloDone &&
(!this.context.AbbreviatedHandshake || this.context.LastHandshakeMsg != HandshakeType.ServerHello))
{
// Read next record (skip empty, e.g. warnings alerts)
this.protocol.BeginReceiveRecord(this.innerStream, NegotiateAsyncWorker, negotiate);
break;
}
// special case for abbreviated handshake where no ServerHelloDone is sent from the server
if (this.context.AbbreviatedHandshake)
{
ClientSessionCache.SetContextFromCache(this.context);
this.context.Negotiating.Cipher.ComputeKeys();
this.context.Negotiating.Cipher.InitializeCipher();
negotiate.State = NegotiateState.SentCipherSpec;
// Send Change Cipher Spec message with the current cipher
// or as plain text if this is the initial negotiation
this.protocol.BeginSendChangeCipherSpec(NegotiateAsyncWorker, negotiate);
}
else
{
// Send client certificate if requested
// even if the server ask for it it _may_ still be optional
bool clientCertificate = this.context.ServerSettings.CertificateRequest;
using (var memstream = new MemoryStream())
{
// NOTE: sadly SSL3 and TLS1 differs in how they handle this and
// the current design doesn't allow a very cute way to handle
// SSL3 alert warning for NoCertificate (41).
if (this.context.SecurityProtocol == SecurityProtocolType.Ssl3)
{
clientCertificate = ((this.context.ClientSettings.Certificates != null) &&
(this.context.ClientSettings.Certificates.Count > 0));
// this works well with OpenSSL (but only for SSL3)
}
byte[] record = null;
if (clientCertificate)
{
record = this.protocol.EncodeHandshakeRecord(HandshakeType.Certificate);
memstream.Write(record, 0, record.Length);
}
// Send Client Key Exchange
record = this.protocol.EncodeHandshakeRecord(HandshakeType.ClientKeyExchange);
memstream.Write(record, 0, record.Length);
// Now initialize session cipher with the generated keys
this.context.Negotiating.Cipher.InitializeCipher();
// Send certificate verify if requested (optional)
if (clientCertificate && (this.context.ClientSettings.ClientCertificate != null))
{
record = this.protocol.EncodeHandshakeRecord(HandshakeType.CertificateVerify);
memstream.Write(record, 0, record.Length);
}
// send the chnage cipher spec.
this.protocol.SendChangeCipherSpec(memstream);
// Send Finished message
record = this.protocol.EncodeHandshakeRecord(HandshakeType.Finished);
memstream.Write(record, 0, record.Length);
negotiate.State = NegotiateState.SentKeyExchange;
// send all the records.
this.innerStream.BeginWrite(memstream.GetBuffer(), 0, (int)memstream.Length, NegotiateAsyncWorker, negotiate);
}
}
break;
case NegotiateState.SentKeyExchange:
this.innerStream.EndWrite(result);
negotiate.State = NegotiateState.ReceiveFinishResponse;
this.protocol.BeginReceiveRecord(this.innerStream, NegotiateAsyncWorker, negotiate);
break;
case NegotiateState.ReceiveFinishResponse:
this.SafeEndReceiveRecord(result);
// Read record until server finished is received
if (this.context.HandshakeState != HandshakeState.Finished)
{
// If all goes well this will process messages:
// Change Cipher Spec
// Server finished
this.protocol.BeginReceiveRecord(this.innerStream, NegotiateAsyncWorker, negotiate);
}
else
{
// Reset Handshake messages information
this.context.HandshakeMessages.Reset();
// Clear Key Info
this.context.ClearKeyInfo();
negotiate.SetComplete();
}
break;
case NegotiateState.SentCipherSpec:
this.protocol.EndSendChangeCipherSpec(result);
negotiate.State = NegotiateState.ReceiveCipherSpecResponse;
// Start reading the cipher spec response
this.protocol.BeginReceiveRecord(this.innerStream, NegotiateAsyncWorker, negotiate);
break;
case NegotiateState.ReceiveCipherSpecResponse:
this.SafeEndReceiveRecord(result, true);
if (this.context.HandshakeState != HandshakeState.Finished)
{
this.protocol.BeginReceiveRecord(this.innerStream, NegotiateAsyncWorker, negotiate);
}
else
{
negotiate.State = NegotiateState.SentFinished;
this.protocol.BeginSendRecord(HandshakeType.Finished, NegotiateAsyncWorker, negotiate);
}
break;
case NegotiateState.SentFinished:
this.protocol.EndSendRecord(result);
// Reset Handshake messages information
this.context.HandshakeMessages.Reset();
// Clear Key Info
this.context.ClearKeyInfo();
negotiate.SetComplete();
break;
}
}
catch (TlsException ex)
{
try {
Exception e = ex;
this.protocol.SendAlert(ref e);
} catch {
}
negotiate.SetComplete(new IOException("The authentication or decryption has failed.", ex));
}
catch (Exception ex)
{
try {
this.protocol.SendAlert(AlertDescription.InternalError);
} catch {
}
negotiate.SetComplete(new IOException("The authentication or decryption has failed.", ex));
}
}
internal override void OnNegotiateHandshakeCallback(IAsyncResult asyncResult)
{
this.protocol.EndSendRecord(asyncResult);
// Read server response
while (this.context.LastHandshakeMsg != HandshakeType.ServerHelloDone)
{
// Read next record
SafeReceiveRecord(this.innerStream);
// special case for abbreviated handshake where no ServerHelloDone is sent from the server
if (this.context.AbbreviatedHandshake && (this.context.LastHandshakeMsg == HandshakeType.ServerHello))
{
break;
}
}
// the handshake is much easier if we can reuse a previous session settings
if (this.context.AbbreviatedHandshake)
{
ClientSessionCache.SetContextFromCache(this.context);
this.context.Negotiating.Cipher.ComputeKeys();
this.context.Negotiating.Cipher.InitializeCipher();
// Send Cipher Spec protocol
this.protocol.SendChangeCipherSpec();
// Read record until server finished is received
while (this.context.HandshakeState != HandshakeState.Finished)
{
// If all goes well this will process messages:
// Change Cipher Spec
// Server finished
SafeReceiveRecord(this.innerStream);
}
// Send Finished message
this.protocol.SendRecord(HandshakeType.Finished);
}
else
{
// Send client certificate if requested
// even if the server ask for it it _may_ still be optional
bool clientCertificate = this.context.ServerSettings.CertificateRequest;
// NOTE: sadly SSL3 and TLS1 differs in how they handle this and
// the current design doesn't allow a very cute way to handle
// SSL3 alert warning for NoCertificate (41).
if (this.context.SecurityProtocol == SecurityProtocolType.Ssl3)
{
clientCertificate = ((this.context.ClientSettings.Certificates != null) &&
(this.context.ClientSettings.Certificates.Count > 0));
// this works well with OpenSSL (but only for SSL3)
}
if (clientCertificate)
{
this.protocol.SendRecord(HandshakeType.Certificate);
}
// Send Client Key Exchange
this.protocol.SendRecord(HandshakeType.ClientKeyExchange);
// Now initialize session cipher with the generated keys
this.context.Negotiating.Cipher.InitializeCipher();
// Send certificate verify if requested (optional)
if (clientCertificate && (this.context.ClientSettings.ClientCertificate != null))
{
this.protocol.SendRecord(HandshakeType.CertificateVerify);
}
// Send Cipher Spec protocol
this.protocol.SendChangeCipherSpec();
// Send Finished message
this.protocol.SendRecord(HandshakeType.Finished);
// Read record until server finished is received
while (this.context.HandshakeState != HandshakeState.Finished)
{
// If all goes well this will process messages:
// Change Cipher Spec
// Server finished
SafeReceiveRecord(this.innerStream);
}
}
// Reset Handshake messages information
this.context.HandshakeMessages.Reset();
// Clear Key Info
this.context.ClearKeyInfo();
}