| /** |
| * 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.hadoop.security; |
| |
| import java.io.IOException; |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.HashSet; |
| import java.util.StringTokenizer; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.util.Shell; |
| import org.apache.hadoop.util.Shell.ExitCodeException; |
| |
| /** |
| * A simple shell-based implementation of {@link GroupMappingServiceProvider} |
| * that exec's the <code>groups</code> shell command to fetch the group |
| * memberships of a given user. |
| */ |
| public class ShellBasedUnixGroupsMapping implements GroupMappingServiceProvider { |
| |
| private static final Log LOG = LogFactory.getLog(ShellBasedUnixGroupsMapping.class); |
| |
| @Override |
| public List<String> getGroups(String user) throws IOException { |
| return getUnixGroups(user); |
| } |
| |
| @Override |
| public void cacheGroupsRefresh() throws IOException { |
| // does nothing in this provider of user to groups mapping |
| } |
| |
| @Override |
| public void cacheGroupsAdd(List<String> groups) throws IOException { |
| // does nothing in this provider of user to groups mapping |
| } |
| |
| /** |
| * 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 list that the <code>user</code> belongs to |
| * @throws IOException if encounter any error when running the command |
| */ |
| private static List<String> getUnixGroups(final String user) throws IOException { |
| String result = ""; |
| try { |
| result = Shell.execCommand(Shell.getGroupsForUserCommand(user)); |
| } catch (ExitCodeException e) { |
| // if we didn't get the group - just return empty list; |
| LOG.warn("got exception trying to get groups for user " + user, e); |
| } |
| |
| StringTokenizer tokenizer = new StringTokenizer(result); |
| List<String> groups = new LinkedList<String>(); |
| while (tokenizer.hasMoreTokens()) { |
| groups.add(tokenizer.nextToken()); |
| } |
| return groups; |
| } |
| } |