| /** |
| * 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 ShellBasedUnixGroupsNetgroupMapping extends ShellBasedUnixGroupsMapping { |
| |
| private static final Log LOG = LogFactory.getLog(ShellBasedUnixGroupsNetgroupMapping.class); |
| |
| protected static boolean netgroupToUsersMapUpdated = true; |
| protected static Map<String, Set<String>> netgroupToUsersMap = |
| new ConcurrentHashMap<String, Set<String>>(); |
| |
| protected static Map<String, Set<String>> userToNetgroupsMap = |
| new ConcurrentHashMap<String, Set<String>>(); |
| |
| @Override |
| public List<String> getGroups(String user) throws IOException { |
| List<String> groups = new LinkedList<String>(); |
| getUnixGroups(user, groups); |
| getNetgroups(user, groups); |
| return groups; |
| } |
| |
| @Override |
| public void cacheGroupsRefresh() throws IOException { |
| List<String> groups = new LinkedList<String>(netgroupToUsersMap.keySet()); |
| netgroupToUsersMap.clear(); |
| cacheGroupsAdd(groups); |
| netgroupToUsersMapUpdated = true; // at the end to avoid race |
| } |
| |
| @Override |
| public void cacheGroupsAdd(List<String> groups) throws IOException { |
| for(String group: groups) { |
| if(group.length() == 0) { |
| // better safe than sorry (should never happen) |
| } else if(group.charAt(0) == '@') { |
| cacheNetgroup(group); |
| } else { |
| // unix group, not caching |
| } |
| } |
| } |
| |
| protected void cacheNetgroup(String group) throws IOException { |
| if(netgroupToUsersMap.containsKey(group)) { |
| return; |
| } else { |
| // returns a string similar to this: |
| // group ( , user, ) ( domain, user1, host.com ) |
| String usersRaw = execShellGetUserForNetgroup(group); |
| // get rid of spaces, makes splitting much easier |
| usersRaw = usersRaw.replaceAll(" +", ""); |
| // remove netgroup name at the beginning of the string |
| usersRaw = usersRaw.replaceFirst( |
| group.replaceFirst("@", "") + "[()]+", |
| ""); |
| // split string into user infos |
| String[] userInfos = usersRaw.split("[()]+"); |
| for(String userInfo : userInfos) { |
| // userInfo: xxx,user,yyy (xxx, yyy can be empty strings) |
| // get rid of everything before first and after last comma |
| String user = userInfo.replaceFirst("[^,]*,", ""); |
| user = user.replaceFirst(",.*$", ""); |
| // voila! got username! |
| if(!netgroupToUsersMap.containsKey(group)) { |
| netgroupToUsersMap.put(group, new HashSet<String>()); |
| } |
| netgroupToUsersMap.get(group).add(user); |
| } |
| netgroupToUsersMapUpdated = true; // at the end to avoid race |
| } |
| } |
| |
| /** |
| * 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 void getUnixGroups(final String user, |
| List<String> groups) throws IOException { |
| String result = execShellGetUnixGroups(user); |
| |
| StringTokenizer tokenizer = new StringTokenizer(result); |
| while (tokenizer.hasMoreTokens()) { |
| groups.add(tokenizer.nextToken()); |
| } |
| } |
| |
| protected void getNetgroups(final String user, |
| List<String> groups) throws IOException { |
| if(netgroupToUsersMapUpdated) { |
| netgroupToUsersMapUpdated = false; // at the beginning to avoid race |
| //update userToNetgroupsMap |
| for(String netgroup : netgroupToUsersMap.keySet()) { |
| for(String netuser : netgroupToUsersMap.get(netgroup)) { |
| // add to userToNetgroupsMap |
| if(!userToNetgroupsMap.containsKey(netuser)) { |
| userToNetgroupsMap.put(netuser, new HashSet<String>()); |
| } |
| userToNetgroupsMap.get(netuser).add(netgroup); |
| } |
| } |
| } |
| if(userToNetgroupsMap.containsKey(user)) { |
| for(String netgroup : userToNetgroupsMap.get(user)) { |
| groups.add(netgroup); |
| } |
| } |
| } |
| |
| protected String execShellGetUnixGroups(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("error while getting groups for user " + user, e); |
| } |
| return result; |
| } |
| |
| protected String execShellGetUserForNetgroup(final String netgroup) |
| throws IOException { |
| String result = ""; |
| try { |
| // shell command does not expect '@' at the begining of the group name |
| result = Shell.execCommand( |
| Shell.getUsersForNetgroupCommand(netgroup.substring(1))); |
| } catch (ExitCodeException e) { |
| // if we didn't get the group - just return empty list; |
| LOG.warn("error while getting users for netgroup " + netgroup, e); |
| } |
| return result; |
| } |
| } |