Thursday, 25 January 2018

Cassandra java driver With SSL

I want to present you an java code for cassandra client with SSL and Cluster. I am not sharing keystores but i pressume you can get that info from google. I also want to provide you and reference sites i have gone through: 

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import java.io.File;
import java.io.InputStream;
import java.security.KeyStore;

import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;

import org.apache.commons.io.FileUtils;
import org.json.JSONArray;
import org.json.JSONObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.datastax.driver.core.Cluster;
import com.datastax.driver.core.Cluster.Builder;
import com.datastax.driver.core.Host;
import com.datastax.driver.core.JdkSSLOptions;
import com.datastax.driver.core.Metadata;
import com.datastax.driver.core.Session;

/**
 *  "dbinfo": {
      "port": 9042,
      "truststorepath":"/path/to/truststore.jks",
      "truststoresecret":"password of truststore",
      "nodes": [
         "127.0.0.2",
         "127.0.0.1"
      ],
      "ssl": false
   },
 * 
 * 
 * 
 * This is an implementation of a simple Java Cassandra client.
 *
 */
public class CassandraClient {
 private static final Logger logme = LoggerFactory.getLogger(CassandraClient.class);

 private Cluster cluster;

 private Session session;

 /**
  * For single node instance setup
  * 
  * @param node
  * @param port
  */
 public void connectToServer(final String node, final Integer port) {

  Builder b = Cluster.builder().addContactPoint(node);

  if (port != null) {
   b.withPort(port);
  }
  cluster = b.build();

  Metadata metadata = cluster.getMetadata();
  logme.info("Cassandra: Cluster name: " + metadata.getClusterName());

  for (Host host : metadata.getAllHosts()) {
   logme.info("Cassandra:Datacenter: " + host.getDatacenter() + " Host: " + host.getAddress() + " Rack: "
     + host.getRack());
  }

  session = cluster.connect();
 }

 /**
  * 
  * For multi node instance setup
  * 
  * @param cfg
  */
 public void connectToServer(JSONObject cfg) {

  Builder b = Cluster.builder();

  JSONObject cassandra = cfg.getJSONObject("dbinfo");
  JSONArray nodes = cassandra.getJSONArray("nodes");

  for (Object node : nodes) {
   b.addContactPoint(node.toString());

  }
  boolean ssl = cassandra.optBoolean("ssl", false);
  int port = cassandra.optInt("port", 9042);
  b.withPort(port);

  if (ssl) {

   String trustPath = cassandra.getString("truststorepath");
   String trustSecret = cassandra.getString("truststoresecret");
   if (trustPath == null || trustSecret == null) {
    logme.error(" *********   Please provide truststore details for cassandra ****************");
   }
   JdkSSLOptions sslOptions = getSSLOptionsFromTrustStore(trustPath, trustSecret);
   b.withSSL(sslOptions);
  }

  cluster = b.build();

  Metadata metadata = cluster.getMetadata();
  logme.info("Cassandra: Cluster name: " + metadata.getClusterName());

  for (Host host : metadata.getAllHosts()) {
   logme.info("Cassandra:Datacenter: " + host.getDatacenter() + " Host: " + host.getAddress() + " Rack: "
     + host.getRack());
  }

  session = cluster.connect();
 }

 public Session getSession() {
  return this.session;
 }

 public void close() {
  session.close();
  cluster.close();
 }

 private JdkSSLOptions getSSLOptionsFromTrustStore(String trustStoreLocation, String trustStorePassword) {
  Cluster cluster;
  SSLContext sslcontext = null;

  try {

   InputStream is = FileUtils.openInputStream(new File(trustStoreLocation));
   KeyStore keystore = KeyStore.getInstance("jks");
   char[] pwd = trustStorePassword.toCharArray();
   keystore.load(is, pwd);
   TrustManagerFactory tmf = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
   tmf.init(keystore);
   TrustManager[] tm = tmf.getTrustManagers();

   sslcontext = SSLContext.getInstance("TLSv1");
   sslcontext.init(null, tm, null);

  } catch (Exception e) {
   logme.error(e.getMessage(), e);
  }

  JdkSSLOptions sslOptions = JdkSSLOptions.builder().withSSLContext(sslcontext).build();

  return sslOptions;
 }

}
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