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| 1 | /* | ||
| 2 | * Copyright (c) 1996, 2011, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | package sun.security.acl; | ||
| 26 | |||
| 27 | import java.util.*; | ||
| 28 | import java.io.*; | ||
| 29 | import java.security.Principal; | ||
| 30 | import java.security.acl.*; | ||
| 31 | |||
| 32 | /** | ||
| 33 | * This is a class that describes one entry that associates users | ||
| 34 | * or groups with permissions in the ACL. | ||
| 35 | * The entry may be used as a way of granting or denying permissions. | ||
| 36 | * @author Satish Dharmaraj | ||
| 37 | */ | ||
| 38 | public class AclEntryImpl implements AclEntry { | ||
| 39 | private Principal user = null; | ||
| 40 | private Vector<Permission> permissionSet = new Vector<>(10, 10); | ||
| 41 | private boolean negative = false; | ||
| 42 | |||
| 43 | /** | ||
| 44 | * Construct an ACL entry that associates a user with permissions | ||
| 45 | * in the ACL. | ||
| 46 | * @param user The user that is associated with this entry. | ||
| 47 | */ | ||
| 48 | public AclEntryImpl(Principal user) { | ||
| 49 | this.user = user; | ||
| 50 | } | ||
| 51 | |||
| 52 | /** | ||
| 53 | * Construct a null ACL entry | ||
| 54 | */ | ||
| 55 | public AclEntryImpl() { | ||
| 56 | } | ||
| 57 | |||
| 58 | /** | ||
| 59 | * Sets the principal in the entity. If a group or a | ||
| 60 | * principal had already been set, a false value is | ||
| 61 | * returned, otherwise a true value is returned. | ||
| 62 | * @param user The user that is associated with this entry. | ||
| 63 | * @return true if the principal is set, false if there is | ||
| 64 | * one already. | ||
| 65 | */ | ||
| 66 | public boolean setPrincipal(Principal user) { | ||
| 67 | if (this.user != null) | ||
| 68 | return false; | ||
| 69 | this.user = user; | ||
| 70 | return true; | ||
| 71 | } | ||
| 72 | |||
| 73 | /** | ||
| 74 | * This method sets the ACL to have negative permissions. | ||
| 75 | * That is the user or group is denied the permission set | ||
| 76 | * specified in the entry. | ||
| 77 | */ | ||
| 78 | public void setNegativePermissions() { | ||
| 79 | negative = true; | ||
| 80 | } | ||
| 81 | |||
| 82 | /** | ||
| 83 | * Returns true if this is a negative ACL. | ||
| 84 | */ | ||
| 85 | public boolean isNegative() { | ||
| 86 | return negative; | ||
| 87 | } | ||
| 88 | |||
| 89 | /** | ||
| 90 | * A principal or a group can be associated with multiple | ||
| 91 | * permissions. This method adds a permission to the ACL entry. | ||
| 92 | * @param permission The permission to be associated with | ||
| 93 | * the principal or the group in the entry. | ||
| 94 | * @return true if the permission was added, false if the | ||
| 95 | * permission was already part of the permission set. | ||
| 96 | */ | ||
| 97 | public boolean addPermission(Permission permission) { | ||
| 98 | |||
| 99 | if (permissionSet.contains(permission)) | ||
| 100 | return false; | ||
| 101 | |||
| 102 | permissionSet.addElement(permission); | ||
| 103 | |||
| 104 | return true; | ||
| 105 | } | ||
| 106 | |||
| 107 | /** | ||
| 108 | * The method disassociates the permission from the Principal | ||
| 109 | * or the Group in this ACL entry. | ||
| 110 | * @param permission The permission to be disassociated with | ||
| 111 | * the principal or the group in the entry. | ||
| 112 | * @return true if the permission is removed, false if the | ||
| 113 | * permission is not part of the permission set. | ||
| 114 | */ | ||
| 115 | public boolean removePermission(Permission permission) { | ||
| 116 | return permissionSet.removeElement(permission); | ||
| 117 | } | ||
| 118 | |||
| 119 | /** | ||
| 120 | * Checks if the passed permission is part of the allowed | ||
| 121 | * permission set in this entry. | ||
| 122 | * @param permission The permission that has to be part of | ||
| 123 | * the permission set in the entry. | ||
| 124 | * @return true if the permission passed is part of the | ||
| 125 | * permission set in the entry, false otherwise. | ||
| 126 | */ | ||
| 127 | public boolean checkPermission(Permission permission) { | ||
| 128 | return permissionSet.contains(permission); | ||
| 129 | } | ||
| 130 | |||
| 131 | /** | ||
| 132 | * return an enumeration of the permissions in this ACL entry. | ||
| 133 | */ | ||
| 134 | public Enumeration<Permission> permissions() { | ||
| 135 | return permissionSet.elements(); | ||
| 136 | } | ||
| 137 | |||
| 138 | /** | ||
| 139 | * Return a string representation of the contents of the ACL entry. | ||
| 140 | */ | ||
| 141 | public String toString() { | ||
| 142 | StringBuffer s = new StringBuffer(); | ||
| 143 | if (negative) | ||
| 144 | s.append("-"); | ||
| 145 | else | ||
| 146 | s.append("+"); | ||
| 147 | if (user instanceof Group) | ||
| 148 | s.append("Group."); | ||
| 149 | else | ||
| 150 | s.append("User."); | ||
| 151 | s.append(user + "="); | ||
| 152 | Enumeration<Permission> e = permissions(); | ||
| 153 | while(e.hasMoreElements()) { | ||
| 154 | Permission p = e.nextElement(); | ||
| 155 | s.append(p); | ||
| 156 | if (e.hasMoreElements()) | ||
| 157 | s.append(","); | ||
| 158 | } | ||
| 159 | return new String(s); | ||
| 160 | } | ||
| 161 | |||
| 162 | /** | ||
| 163 | * Clones an AclEntry. | ||
| 164 | */ | ||
| 165 | public synchronized Object clone() { | ||
| 166 | AclEntryImpl cloned; | ||
| 167 | cloned = new AclEntryImpl(user); | ||
| 168 | cloned.permissionSet = (Vector<Permission>) permissionSet.clone(); | ||
| 169 | cloned.negative = negative; | ||
| 170 | return cloned; | ||
| 171 | } | ||
| 172 | |||
| 173 | /** | ||
| 174 | * Return the Principal associated in this ACL entry. | ||
| 175 | * The method returns null if the entry uses a group | ||
| 176 | * instead of a principal. | ||
| 177 | */ | ||
| 178 | public Principal getPrincipal() { | ||
| 179 | return user; | ||
| 180 | } | ||
| 181 | } | ||