content: /**
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 org.apache.hive.service.auth;
  
  import javax.security.sasl.AuthenticationException;
  
  import net.sf.jpam.Pam;
  import org.apache.hadoop.hive.conf.HiveConf;
  
  public class PamAuthenticationProviderImpl implements PasswdAuthenticationProvider {
  
    private final String pamServiceNames;
  
    PamAuthenticationProviderImpl() {
      HiveConf conf = new HiveConf();
      pamServiceNames = conf.getVar(HiveConf.ConfVars.HIVE_SERVER2_PAM_SERVICES);
    }
  
    @Override
    public void Authenticate(String user, String password) throws AuthenticationException {
  
      if (pamServiceNames == null || pamServiceNames.trim().isEmpty()) {
        throw new AuthenticationException("No PAM services are set.");
      }
  
      String[] pamServices = pamServiceNames.split(",");
      for (String pamService : pamServices) {
        Pam pam = new Pam(pamService);
        boolean isAuthenticated = pam.authenticateSuccessful(user, password);
        if (!isAuthenticated) {
          throw new AuthenticationException(
            "Error authenticating with the PAM service: " + pamService);
        }
      }
    }
  }
  