/*
* Negotiation consists of the following steps (some may be async in the async case):
* 1. Create negotiation state
* 2. Initialize channel factories
* 3. Create an channel
* 4. Open the channel
* 5. Create the next message to send to server
* 6. Send the message and get reply
* 8. Process incoming message and get next outgoing message.
* 9. If no outgoing message, then negotiation is over. Go to step 11.
* 10. Goto step 6
* 11. Close the IAsyncRequest channel and complete
*/
protected async Task <SecurityToken> DoNegotiationAsync(TimeSpan timeout)
{
ThrowIfClosedOrCreated();
TimeoutHelper timeoutHelper = new TimeoutHelper(timeout);
IAsyncRequestChannel rstChannel = null;
T negotiationState = null;
TimeSpan timeLeft = timeout;
int legs = 1;
try
{
negotiationState = await CreateNegotiationStateAsync(_targetAddress, _via, timeoutHelper.RemainingTime());
InitializeNegotiationState(negotiationState);
await InitializeChannelFactoriesAsync(negotiationState.RemoteAddress, timeoutHelper.RemainingTime());
rstChannel = CreateClientChannel(negotiationState.RemoteAddress, _via);
await rstChannel.OpenAsync(timeoutHelper.RemainingTime());
Message nextOutgoingMessage = null;
Message incomingMessage = null;
SecurityToken serviceToken = null;
for (; ;)
{
nextOutgoingMessage = GetNextOutgoingMessage(incomingMessage, negotiationState);
if (incomingMessage != null)
{
incomingMessage.Close();
}
if (nextOutgoingMessage != null)
{
using (nextOutgoingMessage)
{
timeLeft = timeoutHelper.RemainingTime();
incomingMessage = await rstChannel.RequestAsync(nextOutgoingMessage, timeLeft);
if (incomingMessage == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new CommunicationException(SR.FailToRecieveReplyFromNegotiation));
}
}
legs += 2;
}
else
{
if (!negotiationState.IsNegotiationCompleted)
{
throw TraceUtility.ThrowHelperError(new SecurityNegotiationException(SR.NoNegotiationMessageToSend), incomingMessage);
}
try
{
rstChannel.Close(timeoutHelper.RemainingTime());
}
catch (CommunicationException)
{
rstChannel.Abort();
}
catch (TimeoutException)
{
rstChannel.Abort();
}
rstChannel = null;
ValidateAndCacheServiceToken(negotiationState);
serviceToken = negotiationState.ServiceToken;
break;
}
}
return(serviceToken);
}
catch (Exception e)
{
if (Fx.IsFatal(e))
{
throw;
}
if (e is TimeoutException)
{
e = new TimeoutException(SR.Format(SR.ClientSecurityNegotiationTimeout, timeout, legs, timeLeft), e);
}
EndpointAddress temp = (negotiationState == null) ? null : negotiationState.RemoteAddress;
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(WrapExceptionIfRequired(e, temp, _issuerAddress));
}
finally
{
Cleanup(rstChannel, negotiationState);
}
}
private async Task <SecurityToken> DoOperationAsync(SecuritySessionOperation operation, EndpointAddress target, Uri via, SecurityToken currentToken, TimeSpan timeout)
{
if (target == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull(nameof(target));
}
if (operation == SecuritySessionOperation.Renew && currentToken == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull(nameof(currentToken));
}
IAsyncRequestChannel channel = null;
try
{
channel = CreateChannel(operation, target, via);
TimeoutHelper timeoutHelper = new TimeoutHelper(timeout);
await channel.OpenAsync(timeoutHelper.RemainingTime());
object requestState;
GenericXmlSecurityToken issuedToken;
using (Message requestMessage = CreateRequest(operation, target, currentToken, out requestState))
{
EventTraceActivity eventTraceActivity = null;
TraceUtility.ProcessOutgoingMessage(requestMessage, eventTraceActivity);
using (Message reply = await channel.RequestAsync(requestMessage, timeoutHelper.RemainingTime()))
{
if (reply == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new CommunicationException(SR.FailToRecieveReplyFromNegotiation));
}
TraceUtility.ProcessIncomingMessage(reply, eventTraceActivity);
ThrowIfFault(reply, _targetAddress);
issuedToken = ProcessReply(reply, operation, requestState);
ValidateKeySize(issuedToken);
}
}
await channel.CloseAsync(timeoutHelper.RemainingTime());
OnOperationSuccess(operation, target, issuedToken, currentToken);
return(issuedToken);
}
catch (Exception e)
{
if (Fx.IsFatal(e))
{
throw;
}
if (e is TimeoutException)
{
e = new TimeoutException(SR.Format(SR.ClientSecuritySessionRequestTimeout, timeout), e);
}
OnOperationFailure(operation, target, currentToken, e, channel);
throw;
}
}
