| /** |
| * 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.authorize; |
| |
| import java.util.Iterator; |
| import java.util.Set; |
| import java.util.TreeSet; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| import org.apache.hadoop.security.UserGroupInformation; |
| |
| /** |
| * Class representing a configured access control list. |
| */ |
| @InterfaceAudience.LimitedPrivate({"HDFS", "MapReduce"}) |
| @InterfaceStability.Evolving |
| public class AccessControlList { |
| |
| // Indicates an ACL string that represents access to all users |
| public static final String WILDCARD_ACL_VALUE = "*"; |
| |
| // Set of users who are granted access. |
| private Set<String> users; |
| // Set of groups which are granted access |
| private Set<String> groups; |
| // Whether all users are granted access. |
| private boolean allAllowed; |
| |
| /** |
| * Construct a new ACL from a String representation of the same. |
| * |
| * The String is a a comma separated list of users and groups. |
| * The user list comes first and is separated by a space followed |
| * by the group list. For e.g. "user1,user2 group1,group2" |
| * |
| * @param aclString String representation of the ACL |
| */ |
| public AccessControlList(String aclString) { |
| users = new TreeSet<String>(); |
| groups = new TreeSet<String>(); |
| if (aclString.contains(WILDCARD_ACL_VALUE) && |
| aclString.trim().equals(WILDCARD_ACL_VALUE)) { |
| allAllowed = true; |
| } else { |
| String[] userGroupStrings = aclString.split(" ", 2); |
| |
| if (userGroupStrings.length >= 1) { |
| String[] usersStr = userGroupStrings[0].split(","); |
| if (usersStr.length >= 1) { |
| addToSet(users, usersStr); |
| } |
| } |
| |
| if (userGroupStrings.length == 2) { |
| String[] groupsStr = userGroupStrings[1].split(","); |
| if (groupsStr.length >= 1) { |
| addToSet(groups, groupsStr); |
| } |
| } |
| } |
| } |
| |
| public boolean isAllAllowed() { |
| return allAllowed; |
| } |
| |
| /** |
| * Get the names of users allowed for this service. |
| * @return the set of user names. the set must not be modified. |
| */ |
| Set<String> getUsers() { |
| return users; |
| } |
| |
| /** |
| * Get the names of user groups allowed for this service. |
| * @return the set of group names. the set must not be modified. |
| */ |
| Set<String> getGroups() { |
| return groups; |
| } |
| |
| public boolean isUserAllowed(UserGroupInformation ugi) { |
| if (allAllowed || users.contains(ugi.getShortUserName())) { |
| return true; |
| } else { |
| for(String group: ugi.getGroupNames()) { |
| if (groups.contains(group)) { |
| return true; |
| } |
| } |
| } |
| return false; |
| } |
| |
| private static final void addToSet(Set<String> set, String[] strings) { |
| for (String s : strings) { |
| s = s.trim(); |
| if (s.length() > 0) { |
| set.add(s); |
| } |
| } |
| } |
| |
| @Override |
| public String toString() { |
| StringBuilder sb = new StringBuilder(); |
| boolean first = true; |
| for(String user: users) { |
| if (!first) { |
| sb.append(","); |
| } else { |
| first = false; |
| } |
| sb.append(user); |
| } |
| if (!groups.isEmpty()) { |
| sb.append(" "); |
| } |
| first = true; |
| for(String group: groups) { |
| if (!first) { |
| sb.append(","); |
| } else { |
| first = false; |
| } |
| sb.append(group); |
| } |
| return sb.toString(); |
| } |
| } |