Android™

Examine Client Certificates for an Accepted TLS Connection

See more Socket/SSL/TLS Examples

Demonstrates how to access the client certificates for a TLS connection accepted by your application acting as the server. Android™

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    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.
    //  This is the server's certificate.

    CkCert cert = new CkCert();
    success = cert.LoadPfxFile("qa_data/serverCert/myServerCert.pfx","pfx_password");
    if (success == false) {
        Log.i(TAG, 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");

    //  Initialize with our server's TLS certificate.
    success = listenSslSocket.InitSslServer(cert);
    if (success == false) {
        Log.i(TAG, 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) {
        Log.i(TAG, listenSslSocket.lastErrorText());
        return;
        }

    //  Accept the next incoming connection.
    int maxWaitMillisec = 20000;

    CkSocket clientSock = new CkSocket();
    success = listenSslSocket.AcceptNext(maxWaitMillisec,clientSock);
    if (success == false) {
        Log.i(TAG, listenSslSocket.lastErrorText());
        return;
        }

    //  Examine the client certs chain.  The 1st cert will be the client certificate, and
    //  the subsequent certs will be the certs in the chain of authentication.
    int numClientCerts = clientSock.get_NumReceivedClientCerts();
    Log.i(TAG, "numClientCerts = " + String.valueOf(numClientCerts));

    CkCert clientCert = new CkCert();
    int i = 0;
    while (i < numClientCerts) {
        clientSock.GetRcvdClientCert(i,clientCert);
        Log.i(TAG, clientCert.subjectDN());
        i = i + 1;
        }

    //  Close the connection with the client
    success = clientSock.Close(1000);

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}