Java

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". Java

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

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

    CkSocket listenSslSocket = new CkSocket();

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

    CkCert cert = new CkCert();
    //  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) {
        System.out.println(cert.lastErrorText());
        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) {
        System.out.println(listenSslSocket.lastErrorText());
        return;
        }

    //  Bind and listen on a port:
    int myPort = 8123;
    //  Allow for a max of 5 queued connect requests.
    int backLog = 5;
    success = listenSslSocket.BindAndListen(myPort,backLog);
    if (success == false) {
        System.out.println(listenSslSocket.lastErrorText());
        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.put_MaxReadIdleMs(10000);
    listenSslSocket.put_MaxSendIdleMs(10000);

    //  Accept a single client connection and establish the secure SSL/TLS channel:
    int maxWaitMillisec = 20000;
    CkSocket clientSock = new CkSocket();
    success = listenSslSocket.AcceptNext(maxWaitMillisec,clientSock);
    if (success == false) {
        System.out.println(listenSslSocket.lastErrorText());
        return;
        }

    //  The client (in this example) is going to send a "Hello Server! -EOM-" 
    //  message.  Read it:
    String receivedMsg = clientSock.receiveUntilMatch("-EOM-");
    if (clientSock.get_LastMethodSuccess() == false) {
        System.out.println(clientSock.lastErrorText());
        return;
        }

    System.out.println(receivedMsg);

    //  Send a "Hello Client! -EOM-" message:
    success = clientSock.SendString("Hello Client! -EOM-");
    if (success == false) {
        System.out.println(clientSock.lastErrorText());
        return;
        }

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