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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 | } | ||