J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1998-2006 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package java.security; |
| 27 | |
| 28 | import java.security.*; |
| 29 | import java.util.Enumeration; |
| 30 | import java.util.Hashtable; |
| 31 | import java.util.StringTokenizer; |
| 32 | import sun.security.util.SecurityConstants; |
| 33 | |
| 34 | /** |
| 35 | * The AllPermission is a permission that implies all other permissions. |
| 36 | * <p> |
| 37 | * <b>Note:</b> Granting AllPermission should be done with extreme care, |
| 38 | * as it implies all other permissions. Thus, it grants code the ability |
| 39 | * to run with security |
| 40 | * disabled. Extreme caution should be taken before granting such |
| 41 | * a permission to code. This permission should be used only during testing, |
| 42 | * or in extremely rare cases where an application or applet is |
| 43 | * completely trusted and adding the necessary permissions to the policy |
| 44 | * is prohibitively cumbersome. |
| 45 | * |
| 46 | * @see java.security.Permission |
| 47 | * @see java.security.AccessController |
| 48 | * @see java.security.Permissions |
| 49 | * @see java.security.PermissionCollection |
| 50 | * @see java.lang.SecurityManager |
| 51 | * |
| 52 | * |
| 53 | * @author Roland Schemers |
| 54 | * |
| 55 | * @serial exclude |
| 56 | */ |
| 57 | |
| 58 | public final class AllPermission extends Permission { |
| 59 | |
| 60 | private static final long serialVersionUID = -2916474571451318075L; |
| 61 | |
| 62 | /** |
| 63 | * Creates a new AllPermission object. |
| 64 | */ |
| 65 | |
| 66 | public AllPermission() |
| 67 | { |
| 68 | super("<all permissions>"); |
| 69 | } |
| 70 | |
| 71 | |
| 72 | /** |
| 73 | * Creates a new AllPermission object. This |
| 74 | * constructor exists for use by the <code>Policy</code> object |
| 75 | * to instantiate new Permission objects. |
| 76 | * |
| 77 | * @param name ignored |
| 78 | * @param actions ignored. |
| 79 | */ |
| 80 | public AllPermission(String name, String actions) |
| 81 | { |
| 82 | this(); |
| 83 | } |
| 84 | |
| 85 | /** |
| 86 | * Checks if the specified permission is "implied" by |
| 87 | * this object. This method always returns true. |
| 88 | * |
| 89 | * @param p the permission to check against. |
| 90 | * |
| 91 | * @return return |
| 92 | */ |
| 93 | public boolean implies(Permission p) { |
| 94 | return true; |
| 95 | } |
| 96 | |
| 97 | /** |
| 98 | * Checks two AllPermission objects for equality. Two AllPermission |
| 99 | * objects are always equal. |
| 100 | * |
| 101 | * @param obj the object we are testing for equality with this object. |
| 102 | * @return true if <i>obj</i> is an AllPermission, false otherwise. |
| 103 | */ |
| 104 | public boolean equals(Object obj) { |
| 105 | return (obj instanceof AllPermission); |
| 106 | } |
| 107 | |
| 108 | /** |
| 109 | * Returns the hash code value for this object. |
| 110 | * |
| 111 | * @return a hash code value for this object. |
| 112 | */ |
| 113 | |
| 114 | public int hashCode() { |
| 115 | return 1; |
| 116 | } |
| 117 | |
| 118 | /** |
| 119 | * Returns the canonical string representation of the actions. |
| 120 | * |
| 121 | * @return the actions. |
| 122 | */ |
| 123 | public String getActions() |
| 124 | { |
| 125 | return "<all actions>"; |
| 126 | } |
| 127 | |
| 128 | /** |
| 129 | * Returns a new PermissionCollection object for storing AllPermission |
| 130 | * objects. |
| 131 | * <p> |
| 132 | * |
| 133 | * @return a new PermissionCollection object suitable for |
| 134 | * storing AllPermissions. |
| 135 | */ |
| 136 | |
| 137 | public PermissionCollection newPermissionCollection() { |
| 138 | return new AllPermissionCollection(); |
| 139 | } |
| 140 | |
| 141 | } |
| 142 | |
| 143 | /** |
| 144 | * A AllPermissionCollection stores a collection |
| 145 | * of AllPermission permissions. AllPermission objects |
| 146 | * must be stored in a manner that allows them to be inserted in any |
| 147 | * order, but enable the implies function to evaluate the implies |
| 148 | * method in an efficient (and consistent) manner. |
| 149 | * |
| 150 | * @see java.security.Permission |
| 151 | * @see java.security.Permissions |
| 152 | * |
| 153 | * |
| 154 | * @author Roland Schemers |
| 155 | * |
| 156 | * @serial include |
| 157 | */ |
| 158 | |
| 159 | final class AllPermissionCollection |
| 160 | extends PermissionCollection |
| 161 | implements java.io.Serializable |
| 162 | { |
| 163 | |
| 164 | // use serialVersionUID from JDK 1.2.2 for interoperability |
| 165 | private static final long serialVersionUID = -4023755556366636806L; |
| 166 | |
| 167 | private boolean all_allowed; // true if any all permissions have been added |
| 168 | |
| 169 | /** |
| 170 | * Create an empty AllPermissions object. |
| 171 | * |
| 172 | */ |
| 173 | |
| 174 | public AllPermissionCollection() { |
| 175 | all_allowed = false; |
| 176 | } |
| 177 | |
| 178 | /** |
| 179 | * Adds a permission to the AllPermissions. The key for the hash is |
| 180 | * permission.path. |
| 181 | * |
| 182 | * @param permission the Permission object to add. |
| 183 | * |
| 184 | * @exception IllegalArgumentException - if the permission is not a |
| 185 | * AllPermission |
| 186 | * |
| 187 | * @exception SecurityException - if this AllPermissionCollection object |
| 188 | * has been marked readonly |
| 189 | */ |
| 190 | |
| 191 | public void add(Permission permission) |
| 192 | { |
| 193 | if (! (permission instanceof AllPermission)) |
| 194 | throw new IllegalArgumentException("invalid permission: "+ |
| 195 | permission); |
| 196 | if (isReadOnly()) |
| 197 | throw new SecurityException("attempt to add a Permission to a readonly PermissionCollection"); |
| 198 | |
| 199 | all_allowed = true; // No sync; staleness OK |
| 200 | } |
| 201 | |
| 202 | /** |
| 203 | * Check and see if this set of permissions implies the permissions |
| 204 | * expressed in "permission". |
| 205 | * |
| 206 | * @param p the Permission object to compare |
| 207 | * |
| 208 | * @return always returns true. |
| 209 | */ |
| 210 | |
| 211 | public boolean implies(Permission permission) |
| 212 | { |
| 213 | return all_allowed; // No sync; staleness OK |
| 214 | } |
| 215 | |
| 216 | /** |
| 217 | * Returns an enumeration of all the AllPermission objects in the |
| 218 | * container. |
| 219 | * |
| 220 | * @return an enumeration of all the AllPermission objects. |
| 221 | */ |
| 222 | public Enumeration<Permission> elements() |
| 223 | { |
| 224 | return new Enumeration<Permission>() { |
| 225 | private boolean hasMore = all_allowed; |
| 226 | |
| 227 | public boolean hasMoreElements() { |
| 228 | return hasMore; |
| 229 | } |
| 230 | |
| 231 | public Permission nextElement() { |
| 232 | hasMore = false; |
| 233 | return SecurityConstants.ALL_PERMISSION; |
| 234 | } |
| 235 | }; |
| 236 | } |
| 237 | } |