| /** |
| * 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.Arrays; |
| import java.util.LinkedHashSet; |
| import java.util.List; |
| import java.util.Set; |
| |
| import org.apache.commons.collections.CollectionUtils; |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| |
| import org.apache.hadoop.util.NativeCodeLoader; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * A JNI-based implementation of {@link GroupMappingServiceProvider} |
| * that invokes libC calls to get the group |
| * memberships of a given user. |
| */ |
| @InterfaceAudience.LimitedPrivate({"HDFS", "MapReduce"}) |
| @InterfaceStability.Evolving |
| public class JniBasedUnixGroupsMapping implements GroupMappingServiceProvider { |
| |
| private static final Logger LOG = |
| LoggerFactory.getLogger(JniBasedUnixGroupsMapping.class); |
| |
| static { |
| if (!NativeCodeLoader.isNativeCodeLoaded()) { |
| throw new RuntimeException("Bailing out since native library couldn't " + |
| "be loaded"); |
| } |
| anchorNative(); |
| LOG.debug("Using JniBasedUnixGroupsMapping for Group resolution"); |
| } |
| |
| /** |
| * Set up our JNI resources. |
| * |
| * @throws RuntimeException if setup fails. |
| */ |
| native static void anchorNative(); |
| |
| /** |
| * Get the set of groups associated with a user. |
| * |
| * @param username The user name |
| * |
| * @return The set of groups associated with a user. |
| */ |
| native static String[] getGroupsForUser(String username); |
| |
| /** |
| * Log an error message about a group. Used from JNI. |
| */ |
| static private void logError(int groupId, String error) { |
| LOG.error("error looking up the name of group " + groupId + ": " + error); |
| } |
| |
| @Override |
| public List<String> getGroups(String user) throws IOException { |
| return Arrays.asList(getGroupsInternal(user)); |
| } |
| |
| @Override |
| public Set<String> getGroupsSet(String user) throws IOException { |
| String[] groups = getGroupsInternal(user); |
| Set<String> result = new LinkedHashSet(groups.length); |
| CollectionUtils.addAll(result, groups); |
| return result; |
| } |
| |
| private String[] getGroupsInternal(String user) throws IOException { |
| String[] groups = new String[0]; |
| try { |
| groups = getGroupsForUser(user); |
| } catch (Exception e) { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("Error getting groups for " + user, e); |
| } else { |
| LOG.info("Error getting groups for " + user + ": " + e.getMessage()); |
| } |
| } |
| return groups; |
| } |
| |
| @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 |
| } |
| } |