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.ambari.server.security.authentication.pam;
  
  import jakarta.inject.Singleton;
  
  import org.apache.ambari.server.configuration.Configuration;
  import org.jvnet.libpam.PAM;
  import org.jvnet.libpam.PAMException;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.security.authentication.AuthenticationServiceException;
  
  /**
   * PamAuthenticationFactory returns Pam library instances.
   */
  @Singleton
  public class PamAuthenticationFactory {
    private static final Logger LOG = LoggerFactory.getLogger(PamAuthenticationFactory.class);
  
    public PAM createInstance(Configuration configuration) {
      String pamConfig = (configuration == null) ? null : configuration.getPamConfigurationFile();
      return createInstance(pamConfig);
    }
  
    public PAM createInstance(String pamConfig) {
      try {
        //Set PAM configuration file (found under /etc/pam.d)
        return new PAM(pamConfig);
      } catch (PAMException e) {
        String message = String.format("Unable to Initialize PAM: %s", e.getMessage());
        LOG.error(message, e);
        throw new AuthenticationServiceException(message, e);
      }
    }
  }
  