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| 1 | +/* | |
| 2 | + * Copyright (c) 2000, 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 | + | |
| 26 | +package com.sun.rmi.rmid; | |
| 27 | + | |
| 28 | +import java.security.*; | |
| 29 | +import java.io.*; | |
| 30 | +import java.util.*; | |
| 31 | + | |
| 32 | +/** | |
| 33 | + * The ExecOptionPermission class represents permission for rmid to use | |
| 34 | + * a specific command-line option when launching an activation group. | |
| 35 | + * <P> | |
| 36 | + * | |
| 37 | + * @author Ann Wollrath | |
| 38 | + * | |
| 39 | + * @serial exclude | |
| 40 | + */ | |
| 41 | +public final class ExecOptionPermission extends Permission | |
| 42 | +{ | |
| 43 | + /** | |
| 44 | + * does this permission have a wildcard at the end? | |
| 45 | + */ | |
| 46 | + private transient boolean wildcard; | |
| 47 | + | |
| 48 | + /** | |
| 49 | + * the name without the wildcard on the end | |
| 50 | + */ | |
| 51 | + private transient String name; | |
| 52 | + | |
| 53 | + /** | |
| 54 | + * UID for serialization | |
| 55 | + */ | |
| 56 | + private static final long serialVersionUID = 5842294756823092756L; | |
| 57 | + | |
| 58 | + public ExecOptionPermission(String name) { | |
| 59 | + super(name); | |
| 60 | + init(name); | |
| 61 | + } | |
| 62 | + | |
| 63 | + public ExecOptionPermission(String name, String actions) { | |
| 64 | + this(name); | |
| 65 | + } | |
| 66 | + | |
| 67 | + /** | |
| 68 | + * Checks if the specified permission is "implied" by | |
| 69 | + * this object. | |
| 70 | + * <P> | |
| 71 | + * More specifically, this method returns true if:<p> | |
| 72 | + * <ul> | |
| 73 | + * <li> <i>p</i>'s class is the same as this object's class, and<p> | |
| 74 | + * <li> <i>p</i>'s name equals or (in the case of wildcards) | |
| 75 | + * is implied by this object's | |
| 76 | + * name. For example, "a.b.*" implies "a.b.c", and | |
| 77 | + * "a.b=*" implies "a.b=c" | |
| 78 | + * </ul> | |
| 79 | + * | |
| 80 | + * @param p the permission to check against. | |
| 81 | + * | |
| 82 | + * @return true if the passed permission is equal to or | |
| 83 | + * implied by this permission, false otherwise. | |
| 84 | + */ | |
| 85 | + public boolean implies(Permission p) { | |
| 86 | + if (!(p instanceof ExecOptionPermission)) | |
| 87 | + return false; | |
| 88 | + | |
| 89 | + ExecOptionPermission that = (ExecOptionPermission) p; | |
| 90 | + | |
| 91 | + if (this.wildcard) { | |
| 92 | + if (that.wildcard) { | |
| 93 | + // one wildcard can imply another | |
| 94 | + return that.name.startsWith(name); | |
| 95 | + } else { | |
| 96 | + // make sure p.name is longer so a.b.* doesn't imply a.b | |
| 97 | + return (that.name.length() > this.name.length()) && | |
| 98 | + that.name.startsWith(this.name); | |
| 99 | + } | |
| 100 | + } else { | |
| 101 | + if (that.wildcard) { | |
| 102 | + // a non-wildcard can't imply a wildcard | |
| 103 | + return false; | |
| 104 | + } else { | |
| 105 | + return this.name.equals(that.name); | |
| 106 | + } | |
| 107 | + } | |
| 108 | + } | |
| 109 | + | |
| 110 | + /** | |
| 111 | + * Checks two ExecOptionPermission objects for equality. | |
| 112 | + * Checks that <i>obj</i>'s class is the same as this object's class | |
| 113 | + * and has the same name as this object. | |
| 114 | + * <P> | |
| 115 | + * @param obj the object we are testing for equality with this object. | |
| 116 | + * @return true if <i>obj</i> is an ExecOptionPermission, and has the same | |
| 117 | + * name as this ExecOptionPermission object, false otherwise. | |
| 118 | + */ | |
| 119 | + public boolean equals(Object obj) { | |
| 120 | + if (obj == this) | |
| 121 | + return true; | |
| 122 | + | |
| 123 | + if ((obj == null) || (obj.getClass() != getClass())) | |
| 124 | + return false; | |
| 125 | + | |
| 126 | + ExecOptionPermission that = (ExecOptionPermission) obj; | |
| 127 | + | |
| 128 | + return this.getName().equals(that.getName()); | |
| 129 | + } | |
| 130 | + | |
| 131 | + | |
| 132 | + /** | |
| 133 | + * Returns the hash code value for this object. | |
| 134 | + * The hash code used is the hash code of the name, that is, | |
| 135 | + * <code>getName().hashCode()</code>, where <code>getName</code> is | |
| 136 | + * from the Permission superclass. | |
| 137 | + * | |
| 138 | + * @return a hash code value for this object. | |
| 139 | + */ | |
| 140 | + public int hashCode() { | |
| 141 | + return this.getName().hashCode(); | |
| 142 | + } | |
| 143 | + | |
| 144 | + /** | |
| 145 | + * Returns the canonical string representation of the actions. | |
| 146 | + * | |
| 147 | + * @return the canonical string representation of the actions. | |
| 148 | + */ | |
| 149 | + public String getActions() { | |
| 150 | + return ""; | |
| 151 | + } | |
| 152 | + | |
| 153 | + /** | |
| 154 | + * Returns a new PermissionCollection object for storing | |
| 155 | + * ExecOptionPermission objects. | |
| 156 | + * <p> | |
| 157 | + * A ExecOptionPermissionCollection stores a collection of | |
| 158 | + * ExecOptionPermission permissions. | |
| 159 | + * | |
| 160 | + * <p>ExecOptionPermission objects must be stored in a manner that allows | |
| 161 | + * them to be inserted in any order, but that also enables the | |
| 162 | + * PermissionCollection <code>implies</code> method | |
| 163 | + * to be implemented in an efficient (and consistent) manner. | |
| 164 | + * | |
| 165 | + * @return a new PermissionCollection object suitable for | |
| 166 | + * storing ExecOptionPermissions. | |
| 167 | + */ | |
| 168 | + public PermissionCollection newPermissionCollection() { | |
| 169 | + return new ExecOptionPermissionCollection(); | |
| 170 | + } | |
| 171 | + | |
| 172 | + /** | |
| 173 | + * readObject is called to restore the state of the ExecOptionPermission | |
| 174 | + * from a stream. | |
| 175 | + */ | |
| 176 | + private synchronized void readObject(java.io.ObjectInputStream s) | |
| 177 | + throws IOException, ClassNotFoundException | |
| 178 | + { | |
| 179 | + s.defaultReadObject(); | |
| 180 | + // init is called to initialize the rest of the values. | |
| 181 | + init(getName()); | |
| 182 | + } | |
| 183 | + | |
| 184 | + /** | |
| 185 | + * Initialize a ExecOptionPermission object. Common to all constructors. | |
| 186 | + * Also called during de-serialization. | |
| 187 | + */ | |
| 188 | + private void init(String name) | |
| 189 | + { | |
| 190 | + if (name == null) | |
| 191 | + throw new NullPointerException("name can't be null"); | |
| 192 | + | |
| 193 | + if (name.equals("")) { | |
| 194 | + throw new IllegalArgumentException("name can't be empty"); | |
| 195 | + } | |
| 196 | + | |
| 197 | + if (name.endsWith(".*") || name.endsWith("=*") || name.equals("*")) { | |
| 198 | + wildcard = true; | |
| 199 | + if (name.length() == 1) { | |
| 200 | + this.name = ""; | |
| 201 | + } else { | |
| 202 | + this.name = name.substring(0, name.length()-1); | |
| 203 | + } | |
| 204 | + } else { | |
| 205 | + this.name = name; | |
| 206 | + } | |
| 207 | + } | |
| 208 | + | |
| 209 | + /** | |
| 210 | + * A ExecOptionPermissionCollection stores a collection | |
| 211 | + * of ExecOptionPermission permissions. ExecOptionPermission objects | |
| 212 | + * must be stored in a manner that allows them to be inserted in any | |
| 213 | + * order, but enable the implies function to evaluate the implies | |
| 214 | + * method in an efficient (and consistent) manner. | |
| 215 | + * | |
| 216 | + * A ExecOptionPermissionCollection handles comparing a permission like | |
| 217 | + * "a.b.c.d.e" * with a Permission such as "a.b.*", or "*". | |
| 218 | + * | |
| 219 | + * @serial include | |
| 220 | + */ | |
| 221 | + private static class ExecOptionPermissionCollection | |
| 222 | + extends PermissionCollection | |
| 223 | + implements java.io.Serializable | |
| 224 | + { | |
| 225 | + | |
| 226 | + private Hashtable permissions; | |
| 227 | + private boolean all_allowed; // true if "*" is in the collection | |
| 228 | + private static final long serialVersionUID = -1242475729790124375L; | |
| 229 | + | |
| 230 | + /** | |
| 231 | + * Create an empty ExecOptionPermissionCollection. | |
| 232 | + */ | |
| 233 | + public ExecOptionPermissionCollection() { | |
| 234 | + permissions = new Hashtable(11); | |
| 235 | + all_allowed = false; | |
| 236 | + } | |
| 237 | + | |
| 238 | + /** | |
| 239 | + * Adds a permission to the collection. The key for the hash is | |
| 240 | + * permission.name. | |
| 241 | + * | |
| 242 | + * @param permission the Permission object to add. | |
| 243 | + * | |
| 244 | + * @exception IllegalArgumentException - if the permission is not a | |
| 245 | + * ExecOptionPermission | |
| 246 | + * | |
| 247 | + * @exception SecurityException - if this ExecOptionPermissionCollection | |
| 248 | + * object has been marked readonly | |
| 249 | + */ | |
| 250 | + | |
| 251 | + public void add(Permission permission) | |
| 252 | + { | |
| 253 | + if (! (permission instanceof ExecOptionPermission)) | |
| 254 | + throw new IllegalArgumentException("invalid permission: "+ | |
| 255 | + permission); | |
| 256 | + if (isReadOnly()) | |
| 257 | + throw new SecurityException("attempt to add a Permission to a readonly PermissionCollection"); | |
| 258 | + | |
| 259 | + ExecOptionPermission p = (ExecOptionPermission) permission; | |
| 260 | + | |
| 261 | + permissions.put(p.getName(), permission); | |
| 262 | + if (!all_allowed) { | |
| 263 | + if (p.getName().equals("*")) | |
| 264 | + all_allowed = true; | |
| 265 | + } | |
| 266 | + } | |
| 267 | + | |
| 268 | + /** | |
| 269 | + * Check and see if this set of permissions implies the permissions | |
| 270 | + * expressed in "permission". | |
| 271 | + * | |
| 272 | + * @param p the Permission object to compare | |
| 273 | + * | |
| 274 | + * @return true if "permission" is a proper subset of a permission in | |
| 275 | + * the set, false if not. | |
| 276 | + */ | |
| 277 | + public boolean implies(Permission permission) | |
| 278 | + { | |
| 279 | + if (! (permission instanceof ExecOptionPermission)) | |
| 280 | + return false; | |
| 281 | + | |
| 282 | + ExecOptionPermission p = (ExecOptionPermission) permission; | |
| 283 | + | |
| 284 | + // short circuit if the "*" Permission was added | |
| 285 | + if (all_allowed) | |
| 286 | + return true; | |
| 287 | + | |
| 288 | + // strategy: | |
| 289 | + // Check for full match first. Then work our way up the | |
| 290 | + // name looking for matches on a.b.* | |
| 291 | + | |
| 292 | + String pname = p.getName(); | |
| 293 | + | |
| 294 | + Permission x = (Permission) permissions.get(pname); | |
| 295 | + | |
| 296 | + if (x != null) | |
| 297 | + // we have a direct hit! | |
| 298 | + return x.implies(permission); | |
| 299 | + | |
| 300 | + | |
| 301 | + // work our way up the tree... | |
| 302 | + int last, offset; | |
| 303 | + | |
| 304 | + offset = pname.length() - 1; | |
| 305 | + | |
| 306 | + while ((last = pname.lastIndexOf(".", offset)) != -1) { | |
| 307 | + | |
| 308 | + pname = pname.substring(0, last+1) + "*"; | |
| 309 | + x = (Permission) permissions.get(pname); | |
| 310 | + | |
| 311 | + if (x != null) { | |
| 312 | + return x.implies(permission); | |
| 313 | + } | |
| 314 | + offset = last - 1; | |
| 315 | + } | |
| 316 | + | |
| 317 | + // check for "=*" wildcard match | |
| 318 | + pname = p.getName(); | |
| 319 | + offset = pname.length() - 1; | |
| 320 | + | |
| 321 | + while ((last = pname.lastIndexOf("=", offset)) != -1) { | |
| 322 | + | |
| 323 | + pname = pname.substring(0, last+1) + "*"; | |
| 324 | + x = (Permission) permissions.get(pname); | |
| 325 | + | |
| 326 | + if (x != null) { | |
| 327 | + return x.implies(permission); | |
| 328 | + } | |
| 329 | + offset = last - 1; | |
| 330 | + } | |
| 331 | + | |
| 332 | + // we don't have to check for "*" as it was already checked | |
| 333 | + // at the top (all_allowed), so we just return false | |
| 334 | + return false; | |
| 335 | + } | |
| 336 | + | |
| 337 | + /** | |
| 338 | + * Returns an enumeration of all the ExecOptionPermission objects in the | |
| 339 | + * container. | |
| 340 | + * | |
| 341 | + * @return an enumeration of all the ExecOptionPermission objects. | |
| 342 | + */ | |
| 343 | + | |
| 344 | + public Enumeration elements() | |
| 345 | + { | |
| 346 | + return permissions.elements(); | |
| 347 | + } | |
| 348 | + } | |
| 349 | +} | |