/// <summary>
/// Called by servers to authenticate the server and optionally the client in
/// a client-server connection using the specified certificate.
/// </summary>
/// <param name="cert">The certificate used to authenticate the server.</param>
public void AuthenticateAsServer(X509Certificate cert)
{
var data = new AuthenticateAsServerData
{
Certificate = cert,
};
// Using thread in threadpool to manage the authentication process
ThreadPool.QueueUserWorkItem(AuthenticateAsServerTask, data, false);
DateTime endTime = DateTime.Now + timeout;
if (rdpeudpSocket.AutoHandle)
{
while (!IsAuthenticated && DateTime.Now < endTime)
{
Thread.Sleep(waitInterval);
}
if (!IsAuthenticated)
{
if (data.Exception != null)
{
throw data.Exception;
}
throw new TimeoutException("Time out when Authenticate as Server!");
}
}
}
/// <summary>
/// Called by servers to authenticate the server and optionally the client in
/// a client-server connection using the specified certificate.
/// </summary>
/// <param name="data">The authenticate as server data.</param>
private void AuthenticateAsServerTask(AuthenticateAsServerData data)
{
try
{
var cert = data.Certificate;
dtlsServerContext = new DtlsServerSecurityContext(
SecurityPackageType.Schannel,
new CertificateCredential((X509Certificate)cert),
null,
ServerSecurityContextAttribute.ReplayDetect | ServerSecurityContextAttribute.SequenceDetect |
ServerSecurityContextAttribute.Confidentiality | ServerSecurityContextAttribute.ExtendedError |
ServerSecurityContextAttribute.Datagram,
SecurityTargetDataRepresentation.SecurityNativeDrep);
// First accept.
byte[] clientToken = this.GetReceivedData(this.timeout);
dtlsServerContext.Accept(clientToken);
this.SendData(dtlsServerContext.Token);
while (dtlsServerContext.NeedContinueProcessing)
{
if (dtlsServerContext.HasMoreFragments)
{
dtlsServerContext.Accept(null);
}
else
{
clientToken = this.GetReceivedData(this.timeout);
dtlsServerContext.Accept(clientToken);
}
if (dtlsServerContext.Token != null)
{
this.SendData(dtlsServerContext.Token);
}
}
isAuthenticated = true;
dtlsStreamSizes = dtlsServerContext.StreamSizes;
}
catch (Exception ex)
{
data.Exception = ex;
}
}
