Using Renegotiation in C#

S Abijith 386

Hi All,

We have a WPF application built on .Net Framework 4.8. This application acts an HTTPs client. We are currently using the code provided in the attached file for HTTPs communication. This code is used to run a sequence of commands one after another.

We are able to see in Wireshark traces that the connection is currently using 'Session Resumption' each time a new command is executed, but we want to renegotiate the connection rather than session resumption.

Can anyone let us know as to how this can be done?

Any help is appreciated!

Thank you in advance!

Code used: HttpsConnection.txt

1 answer

Hongrui Yu-MSFT 1,605 Microsoft Vendor

Hi,@S Abijith. Welcome to Microsoft Q&A.

If you want to reconnect every time you send a request, you could try the following method.

Method 1: Set request.KeepAlive = false;

Method 2:Set request.ServicePoint.ConnectionLeaseTimeout = 0;

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S Abijith 386 Reputation points

2024-09-17T06:05:12.6333333+00:00

Hello @Hongrui Yu-MSFT ,

We tried the code snippet provided by you.

We found that this is creating a new session each time a command is executed. But we do not want this to happen. We do not want to create a new session nor to resume an existing session.

We actually need the connection to use the 'renegotiation_info' as mentioned in the RFC 5746.

Can you please help us on this!!

Hongrui Yu-MSFT 1,605 Microsoft Vendor

Hi,@S Abijith.

You could try request.Connection = "Close"; and request.Connection = "Keep-alive";

At present, I have only found sslStream.NegotiateClientCertificateAsync(); which may meet your needs, but sslStream.NegotiateClientCertificateAsync(); could only run in the .Net environment.Does not match your environment.You could refer to the following documents and codes.

Related Documents:

1.SslStream.NegotiateClientCertificateAsync(CancellationToken) Method (System.Net.Security) | Microsoft Learn

2.Breaking change: AllowRenegotiation default is false - .NET | Microsoft Learn


        private void Button_Click(object sender, RoutedEventArgs e)

        {

 

            string server = "yourserver.com";

            int port = 443;

            var clientCertificate = new X509Certificate2("path_to_your_certificate.pfx", "your_password");

 

            using (TcpClient client = new TcpClient(server, port))

            using (SslStream sslStream = new SslStream(client.GetStream(), false))

            {

                var sslOptions = new SslClientAuthenticationOptions

                {

                    AllowRenegotiation = true,

                    TargetHost = server,

                    ClientCertificates = new X509CertificateCollection { clientCertificate },

                    EnabledSslProtocols = System.Security.Authentication.SslProtocols.Tls12

                };

 

                sslStream.AuthenticateAsClient(sslOptions);

 

                // Send Request

                SendRequest(sslStream);

 

                // Renegotiation

                sslStream.NegotiateClientCertificateAsync();

 

                // Send the request again              

 SendRequest(sslStream);

 

            }

        }

 

        private static void SendRequest(SslStream sslStream)

        {

            // Code for sending HTTP request

            byte[] request = System.Text.Encoding.ASCII.GetBytes("GET / HTTP/1.1\r\nHost: yourserver.com\r\n\r\n");

            sslStream.Write(request);

            sslStream.Flush();

 

            // Read Response

            byte[] buffer = new byte[2048];

            int bytesRead = sslStream.Read(buffer, 0, buffer.Length);

            Console.WriteLine(System.Text.Encoding.ASCII.GetString(buffer, 0, bytesRead));

        }

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Using Renegotiation in C#

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