Java Requires Chilkat v11.0.0+

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. Chilkat2 Java

import com.chilkatsoft.chilkat2.Cert;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Socket;

public class ChilkatExample {

    public static void main(String[] args) {
        // This example requires the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

        Socket listenSslSocket = new Socket();

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

        Cert cert = new Cert();
        try {
            cert.loadPfxFile("qa_data/serverCert/myServerCert.pfx", "pfx_password");

            // 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.
            listenSslSocket.initSslServer(cert);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Bind and listen on a port:
        int myPort = 8123;
        // Allow for a max of 5 queued connect requests.
        int backLog = 5;
        try {
            listenSslSocket.bindAndListen(myPort, backLog);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

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

        Socket clientSock = new Socket();
        try {
            listenSslSocket.acceptNext(maxWaitMillisec, clientSock);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            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.getNumReceivedClientCerts();
        System.out.println("numClientCerts = " + numClientCerts);

        Cert clientCert = new Cert();
        int i = 0;
        while (i < numClientCerts) {
            clientSock.getRcvdClientCert(i, clientCert);
            System.out.println(clientCert.getSubjectDN());
            i = i + 1;
        }

        // Close the connection with the client
        clientSock.closeConnection(1000);
    }
}