| /** |
| * 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; |
| |
| import java.io.IOException; |
| import java.util.Set; |
| import java.util.HashSet; |
| import java.util.Map; |
| import java.util.StringTokenizer; |
| import backtype.storm.Config; |
| import backtype.storm.utils.Utils; |
| import backtype.storm.utils.ShellUtils; |
| import backtype.storm.utils.TimeCacheMap; |
| import backtype.storm.utils.ShellUtils.ExitCodeException; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| |
| public class ShellBasedGroupsMapping implements |
| IGroupMappingServiceProvider { |
| |
| public static final Logger LOG = LoggerFactory.getLogger(ShellBasedGroupsMapping.class); |
| public TimeCacheMap<String, Set<String>> cachedGroups; |
| |
| /** |
| * Invoked once immediately after construction |
| * @param storm_conf Storm configuration |
| */ |
| @Override |
| public void prepare(Map storm_conf) { |
| int timeout = Utils.getInt(storm_conf.get(Config.STORM_GROUP_MAPPING_SERVICE_CACHE_DURATION_SECS)); |
| cachedGroups = new TimeCacheMap<>(timeout); |
| } |
| |
| /** |
| * Returns list of groups for a user |
| * |
| * @param user get groups for this user |
| * @return list of groups for a given user |
| */ |
| @Override |
| public Set<String> getGroups(String user) throws IOException { |
| if(cachedGroups.containsKey(user)) { |
| return cachedGroups.get(user); |
| } |
| Set<String> groups = getUnixGroups(user); |
| if(!groups.isEmpty()) |
| cachedGroups.put(user,groups); |
| return groups; |
| } |
| |
| /** |
| * Get the current user's group list from Unix by running the command 'groups' |
| * NOTE. For non-existing user it will return EMPTY list |
| * @param user user name |
| * @return the groups set that the <code>user</code> belongs to |
| * @throws IOException if encounter any error when running the command |
| */ |
| private static Set<String> getUnixGroups(final String user) throws IOException { |
| String result; |
| try { |
| result = ShellUtils.execCommand(ShellUtils.getGroupsForUserCommand(user)); |
| } catch (ExitCodeException e) { |
| // if we didn't get the group - just return empty list; |
| LOG.debug("unable to get groups for user " + user + ".ShellUtils command failed with exit code "+ e.getExitCode()); |
| return new HashSet<>(); |
| } |
| |
| StringTokenizer tokenizer = |
| new StringTokenizer(result, ShellUtils.TOKEN_SEPARATOR_REGEX); |
| Set<String> groups = new HashSet<>(); |
| while (tokenizer.hasMoreTokens()) { |
| groups.add(tokenizer.nextToken()); |
| } |
| return groups; |
| } |
| |
| } |