Go

Accept TLS Connection with Client Authentication

See more Socket/SSL/TLS Examples

Demonstrates how to accept a TLS connection requiring client authentication. This is the case where the TLS client sends a certificate. It is also known as "Two-Way SSL". Go

    success := false

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    listenSslSocket := chilkat.NewSocket()

    // An SSL/TLS server needs a digital certificate.  This example loads it from a PFX file.
    // Note: This is the server's certificate.

    cert := chilkat.NewCert()
    // The 1st argument is the file path, the 2nd arg is the 
    // PFX file's password:
    success = cert.LoadPfxFile("chilkat.pfx","test")
    if success == false {
        fmt.Println(cert.LastErrorText())
        listenSslSocket.DisposeSocket()
        cert.DisposeCert()
        return
    }

    // To accept client client certificates in the TLS handshake,
    // we must indicate a list of acceptable client certificate root CA DN's
    // that are allowed.  (DN is an acronym for Distinguished Name.)
    // Call AddSslAcceptableClientCaDn once for each acceptable CA DN.
    // Here are a few examples so you can see the general format of a DN.
    listenSslSocket.AddSslAcceptableClientCaDn("C=SE, O=AddTrust AB, OU=AddTrust External TTP Network, CN=AddTrust External CA Root")
    listenSslSocket.AddSslAcceptableClientCaDn("O=Digital Signature Trust Co., CN=DST Root CA X3")

    // Use the certificate:
    success = listenSslSocket.InitSslServer(cert)
    if success == false {
        fmt.Println(listenSslSocket.LastErrorText())
        listenSslSocket.DisposeSocket()
        cert.DisposeCert()
        return
    }

    // Bind and listen on a port:
    myPort := 8123
    // Allow for a max of 5 queued connect requests.
    backLog := 5
    success = listenSslSocket.BindAndListen(myPort,backLog)
    if success == false {
        fmt.Println(listenSslSocket.LastErrorText())
        listenSslSocket.DisposeSocket()
        cert.DisposeCert()
        return
    }

    // If accepting an SSL/TLS connection, the SSL handshake is part of the connection
    // establishment process. This involves a few back-and-forth messages between the 
    // client and server to establish algorithms and a shared key to create the secure 
    // channel. The sending and receiving of these messages are governed by the 
    // MaxReadIdleMs and MaxSendIdleMs properties. If these properties are set to 0 
    // (and this is the default unless changed by your application), then the 
    // AcceptNext can hang indefinitely during the SSL handshake process. 
    // Make sure these properties are set to appropriate values before calling AcceptNext.

    // Set a 10 second max for waiting to read/write.  This is for the SSL/TLS handshake establishment.
    listenSslSocket.SetMaxReadIdleMs(10000)
    listenSslSocket.SetMaxSendIdleMs(10000)

    // Accept a single client connection and establish the secure SSL/TLS channel:
    maxWaitMillisec := 20000
    clientSock := chilkat.NewSocket()
    success = listenSslSocket.AcceptNext(maxWaitMillisec,clientSock)
    if success == false {
        fmt.Println(listenSslSocket.LastErrorText())
        listenSslSocket.DisposeSocket()
        cert.DisposeCert()
        clientSock.DisposeSocket()
        return
    }

    // The client (in this example) is going to send a "Hello Server! -EOM-" 
    // message.  Read it:
    receivedMsg := clientSock.ReceiveUntilMatch("-EOM-")
    if clientSock.LastMethodSuccess() == false {
        fmt.Println(clientSock.LastErrorText())
        listenSslSocket.DisposeSocket()
        cert.DisposeCert()
        clientSock.DisposeSocket()
        return
    }

    fmt.Println(*receivedMsg)

    // Send a "Hello Client! -EOM-" message:
    success = clientSock.SendString("Hello Client! -EOM-")
    if success == false {
        fmt.Println(clientSock.LastErrorText())
        listenSslSocket.DisposeSocket()
        cert.DisposeCert()
        clientSock.DisposeSocket()
        return
    }

    // Close the connection with the client
    // Wait a max of 20 seconds (20000 millsec)
    success = clientSock.Close(20000)

    listenSslSocket.DisposeSocket()
    cert.DisposeCert()
    clientSock.DisposeSocket()