(Android™) HTTP - Verify Server is a Trusted Root CA

Demonstrates how to only allow connections to an HTTP server having a certificate with a root that is in our list of trusted CA root certificates.

Chilkat Android™ Downloads Android™ Java Libraries Android C/C++ Libraries

// 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);

    // Starting in v9.5.0.49, all Chilkat classes can be unlocked at once at the beginning of a program
    // by calling UnlockBundle.  It requires a Bundle unlock code.
    CkGlobal chilkatGlob = new CkGlobal();
    boolean success = chilkatGlob.UnlockBundle("Anything for 30-day trial.");
    if (success != true) {
        Log.i(TAG, chilkatGlob.lastErrorText());
        return;
        }

    //  On my particular system, the root CA cert for this URL is not pre-installed.
    //  Note: This may be different for you.
    //  Also, this example was written on 29-May-2015.  This URL was valid at the time,
    //  but may not be valid at a future date.
    String url = "https://animals.nationalgeographic.com/animals/invertebrates/starfish/";

    CkHttp http = new CkHttp();

    //  Require that the SSL/TLS server certificate is not expired,
    //  and that the certificate signature is valid.
    //  This does not ensure that it has a chain of authentication to
    //  a trusted root.  To ensure that, the TrustedRoots object (below) is required.
    http.put_RequireSslCertVerify(true);

    //  Do the HTTPS page fetch (through the SSH tunnel)
    String html = http.quickGetStr(url);
    if (http.get_LastMethodSuccess() != true) {
        Log.i(TAG, http.lastErrorText());
        return;
        }

    Log.i(TAG, "The HTTP GET was successful.");

    //  Now let's require that HTTP requests to SSL/TLS servers that don't have trusted CA roots
    //  should fail.
    CkTrustedRoots trustedRoots = new CkTrustedRoots();

    //  Indicate that we will trust any pre-installed certificates on this system.
    //  (The meaning of pre-installed certificates depends on the operating system, and in
    //  some environments there is no such thing as pre-installed certificates.  See the reference
    //  documentation for the TrustedRoots class.)
    trustedRoots.put_TrustSystemCaRoots(true);

    //  Activate the trusted roots globally for all Chilkat objects.
    //  This call really shouldn't fail, so we're not checking the return value.
    success = trustedRoots.Activate();

    //  Given that our previous HTTP GET likely kept the connection open,
    //  make sure that all HTTP connections are closed before re-trying.
    //  Otherwise, we'll simply be re-using the pre-existing connection.
    success = http.CloseAllConnections();

    //  Now let's try fetching the URL again.  It should fail this time because
    //  there is a requirement that the SSL/TLS server certificate must have a trusted root,
    //  and the trusted root for this URL is not installed on my system (but may be different for you..)
    html = http.quickGetStr(url);
    if (http.get_LastMethodSuccess() != true) {
        Log.i(TAG, http.lastErrorText());
        Log.i(TAG, "Good, the HTTP request failed as expected.");
        }
    else {
        Log.i(TAG, http.lastErrorText());
        Log.i(TAG, "Hmmm... we did not fail as expected?");
        }


  }

  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."
  }
}