https://github.com/datastax/java-driver/java-driver-core: A driver for Apache Cassandra(R) 2.1+ that works exclusively with the Cassandra Query Language version 3 (CQL3) and Cassandra's native protocol versions 3 and above.
  • Various (DataStax) 
/*
 * Copyright DataStax, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.datastax.oss.driver.api.core.auth;

import com.datastax.oss.driver.api.core.connection.ReconnectionPolicy;
import com.datastax.oss.driver.api.core.metadata.EndPoint;
import com.datastax.oss.driver.internal.core.auth.PlainTextAuthProvider;
import edu.umd.cs.findbugs.annotations.NonNull;


Provides Authenticator instances to use when connecting to Cassandra nodes. 
See PlainTextAuthProvider for an implementation which uses SASL PLAIN mechanism to authenticate using username/password strings. 
/**
 * Provides {@link Authenticator} instances to use when connecting to Cassandra nodes.
 *
 * <p>See {@link PlainTextAuthProvider} for an implementation which uses SASL PLAIN mechanism to
 * authenticate using username/password strings.
 */
public interface AuthProvider extends AutoCloseable {

  
The authenticator to use when connecting to host. 
Params:
  • endPoint – the Cassandra host to connect to.
  • serverAuthenticator – the configured authenticator on the host.
Returns:the authentication implementation to use.
/**
   * The authenticator to use when connecting to {@code host}.
   *
   * @param endPoint the Cassandra host to connect to.
   * @param serverAuthenticator the configured authenticator on the host.
   * @return the authentication implementation to use.
   */
  @NonNull
  Authenticator newAuthenticator(@NonNull EndPoint endPoint, @NonNull String serverAuthenticator)
      throws AuthenticationException;

  
What to do if the server does not send back an authentication challenge (in other words, lets
the client connect without any form of authentication).

This is suspicious because having authentication enabled on the client but not on the server
is probably a configuration mistake.

Provider implementations are free to handle this however they want; typical approaches are:



/**
   * What to do if the server does not send back an authentication challenge (in other words, lets
   * the client connect without any form of authentication).
   *
   * <p>This is suspicious because having authentication enabled on the client but not on the server
   * is probably a configuration mistake.
   *
   * <p>Provider implementations are free to handle this however they want; typical approaches are:
   *
   * <ul>
   *   <li>ignoring;
   *   <li>logging a warning;
   *   <li>throwing an {@link AuthenticationException} to abort the connection (but note that it
   *       will be retried according to the {@link ReconnectionPolicy}).
   * </ul>
   */
  void onMissingChallenge(@NonNull EndPoint endPoint) throws AuthenticationException;
}