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 backtype.storm.security.auth.authorizer;
  
  import java.util.Arrays;
  import java.util.Map;
  import java.util.Set;
  import java.util.HashSet;
  import java.util.Collection;
  import java.io.IOException;
  
  import backtype.storm.Config;
  import backtype.storm.security.auth.IAuthorizer;
  import backtype.storm.security.auth.ReqContext;
  import backtype.storm.security.auth.AuthUtils;
  import backtype.storm.security.auth.IPrincipalToLocal;
  import backtype.storm.security.auth.IGroupMappingServiceProvider;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * An authorization implementation that simply checks if a user is allowed to perform specific operations.
   */
  public class SimpleACLAuthorizer implements IAuthorizer {
      private static final Logger LOG = LoggerFactory.getLogger(SimpleACLAuthorizer.class);
  
      protected Set<String> _userCommands = new HashSet<String>(Arrays.asList("submitTopology", "fileUpload", "getNimbusConf", "getClusterInfo"));
      protected Set<String> _supervisorCommands = new HashSet<String>(Arrays.asList("fileDownload"));
      protected Set<String> _topoCommands = new HashSet<String>(Arrays.asList("killTopology", "rebalance", "activate", "deactivate", "getTopologyConf",
              "getTopology", "getUserTopology", "getTopologyInfo", "uploadNewCredentials"));
  
      protected Set<String> _admins;
      protected Set<String> _supervisors;
      protected Set<String> _nimbusUsers;
      protected Set<String> _nimbusGroups;
      protected IPrincipalToLocal _ptol;
      protected IGroupMappingServiceProvider _groupMappingProvider;
  
      /**
       * Invoked once immediately after construction
       * 
       * @param conf Storm configuration
       */
      @Override
      public void prepare(Map conf) {
          _admins = new HashSet<String>();
          _supervisors = new HashSet<String>();
          _nimbusUsers = new HashSet<String>();
          _nimbusGroups = new HashSet<String>();
  
          if (conf.containsKey(Config.NIMBUS_ADMINS)) {
              _admins.addAll((Collection<String>) conf.get(Config.NIMBUS_ADMINS));
          }
          if (conf.containsKey(Config.NIMBUS_SUPERVISOR_USERS)) {
              _supervisors.addAll((Collection<String>) conf.get(Config.NIMBUS_SUPERVISOR_USERS));
          }
          if (conf.containsKey(Config.NIMBUS_USERS)) {
              _nimbusUsers.addAll((Collection<String>) conf.get(Config.NIMBUS_USERS));
          }
  
          if (conf.containsKey(Config.NIMBUS_GROUPS)) {
              _nimbusGroups.addAll((Collection<String>) conf.get(Config.NIMBUS_GROUPS));
          }
  
          _ptol = AuthUtils.GetPrincipalToLocalPlugin(conf);
          _groupMappingProvider = AuthUtils.GetGroupMappingServiceProviderPlugin(conf);
      }
  
      /**
       * permit() method is invoked for each incoming Thrift request
       * 
       * @param context request context includes info about
       * @param operation operation name
       * @param topology_conf configuration of targeted topology
       * @return true if the request is authorized, false if reject
       */
      @Override
      public boolean permit(ReqContext context, String operation, Map topology_conf) {
          LOG.info("[req " + context.requestID() + "] Access " + " from: " + (context.remoteAddress() == null ? "null" : context.remoteAddress().toString())
                  + (context.principal() == null ? "" : (" principal:" + context.principal())) + " op:" + operation
                  + (topology_conf == null ? "" : (" topoology:" + topology_conf.get(Config.TOPOLOGY_NAME))));
  
          String principal = context.principal().getName();
          String user = _ptol.toLocal(context.principal());
          Set<String> userGroups = new HashSet<String>();
  
          if (_groupMappingProvider != null) {
              try {
                  userGroups = _groupMappingProvider.getGroups(user);
              } catch (IOException e) {
                  LOG.warn("Error while trying to fetch user groups", e);
              }
          }
  
          if (_admins.contains(principal) || _admins.contains(user)) {
              return true;
          }
  
          if (_supervisors.contains(principal) || _supervisors.contains(user)) {
              return _supervisorCommands.contains(operation);
          }
  
          if (_userCommands.contains(operation)) {
              return _nimbusUsers.size() == 0 || _nimbusUsers.contains(user) || checkUserGroupAllowed(userGroups, _nimbusGroups);
          }
  
          if (_topoCommands.contains(operation)) {
              Set topoUsers = new HashSet<String>();
              if (topology_conf.containsKey(Config.TOPOLOGY_USERS)) {
                  topoUsers.addAll((Collection<String>) topology_conf.get(Config.TOPOLOGY_USERS));
              }
  
              if (topoUsers.contains(principal) || topoUsers.contains(user)) {
                  return true;
              }
  
              Set<String> topoGroups = new HashSet<String>();
              if (topology_conf.containsKey(Config.TOPOLOGY_GROUPS) && topology_conf.get(Config.TOPOLOGY_GROUPS) != null) {
                  topoGroups.addAll((Collection<String>) topology_conf.get(Config.TOPOLOGY_GROUPS));
              }
  
              if (checkUserGroupAllowed(userGroups, topoGroups))
                  return true;
          }
          return false;
      }
  
      private Boolean checkUserGroupAllowed(Set<String> userGroups, Set<String> configuredGroups) {
          if (userGroups.size() > 0 && configuredGroups.size() > 0) {
              for (String tgroup : configuredGroups) {
                  if (userGroups.contains(tgroup))
                      return true;
              }
          }
          return false;
      }
  }
  