Secure FTP with Client Certificate

Chilkat FTP2 provides the ability to use a client certificate with secure FTP (implicit or explicit SSL/TLS). This example demonstrates how to load a certificate from a .pfx and use it as the client-side SSL cert. Note: Client-side certificates are only needed in situations where the server demands one.

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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[])
  {
    CkFtp2 ftp = new CkFtp2();

    boolean success;

    //  Any string unlocks the component for the 1st 30-days.
    success = ftp.UnlockComponent("Anything for 30-day trial");
    if (success != true) {
        System.out.println(ftp.lastErrorText());
        return;
    }

    ftp.put_Hostname("ftp.***.com");
    ftp.put_Port(21);
    ftp.put_Username("test");
    ftp.put_Password("test");

    //  This example will use explict TLS/SSL.
    //  Establish an explicit secure channel after connection
    //  on the standard FTP port 21.
    ftp.put_AuthTls(true);

    //  The Ssl property is for establishing an implicit SSL connection
    //  on port 990.  Because this example uses explicit SSL, it
    //  should remain false.
    ftp.put_Ssl(false);

    //  Load a certificate from a .pfx
    //  A PFX may contain several certs, including the certificates
    //  in a chain of authority.
    CkCertStore certStore = new CkCertStore();
    String password;
    password = "***";
    //  Load the certs from a PFX into an in-memory certificate store:
    success = certStore.LoadPfxFile("chilkat.pfx",password);
    if (success != true) {
        System.out.println(certStore.lastErrorText());
        return;
    }

    //  Find the exact cert we'll use:
    CkCert cert;
    cert = certStore.FindCertBySubject("Chilkat Software, Inc.");
    if (cert == null ) {
        System.out.println("Certificate not found!");
        return;
    }

    //  Use this certificate for our secure (SSL/TLS) connection:
    ftp.SetSslClientCert(cert);

    //  Connect and login to the FTP server.  The connection is
    //  made secure because of the AuthTls setting.
    success = ftp.Connect();
    if (success != true) {
        System.out.println(ftp.lastErrorText());
        return;
    }
    else {
        //  LastErrorText contains information even when
        //  successful. This allows you to visually verify
        //  that the secure connection actually occurred.
        System.out.println(ftp.lastErrorText());
    }

    System.out.println("Secure FTP Channel Established!");

    //  Do whatever you're doing to do ...
    //  upload files, download files, etc...

    //  .....
    //  .....

    ftp.Disconnect();
  }
}