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| 1 | +/* | |
| 2 | + * Copyright (c) 1996, 2008, 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 sun.rmi.server; | |
| 27 | + | |
| 28 | +import java.io.File; | |
| 29 | +import java.io.FilePermission; | |
| 30 | +import java.io.IOException; | |
| 31 | +import java.lang.ref.ReferenceQueue; | |
| 32 | +import java.lang.ref.SoftReference; | |
| 33 | +import java.lang.ref.WeakReference; | |
| 34 | +import java.lang.reflect.Modifier; | |
| 35 | +import java.lang.reflect.Proxy; | |
| 36 | +import java.net.JarURLConnection; | |
| 37 | +import java.net.MalformedURLException; | |
| 38 | +import java.net.SocketPermission; | |
| 39 | +import java.net.URL; | |
| 40 | +import java.net.URLClassLoader; | |
| 41 | +import java.net.URLConnection; | |
| 42 | +import java.security.AccessControlContext; | |
| 43 | +import java.security.CodeSource; | |
| 44 | +import java.security.Permission; | |
| 45 | +import java.security.Permissions; | |
| 46 | +import java.security.PermissionCollection; | |
| 47 | +import java.security.Policy; | |
| 48 | +import java.security.ProtectionDomain; | |
| 49 | +import java.rmi.server.LogStream; | |
| 50 | +import java.util.Arrays; | |
| 51 | +import java.util.Collections; | |
| 52 | +import java.util.Enumeration; | |
| 53 | +import java.util.HashMap; | |
| 54 | +import java.util.IdentityHashMap; | |
| 55 | +import java.util.Map; | |
| 56 | +import java.util.StringTokenizer; | |
| 57 | +import java.util.WeakHashMap; | |
| 58 | +import sun.rmi.runtime.Log; | |
| 59 | +import sun.security.action.GetPropertyAction; | |
| 60 | + | |
| 61 | +/** | |
| 62 | + * <code>LoaderHandler</code> provides the implementation of the static | |
| 63 | + * methods of the <code>java.rmi.server.RMIClassLoader</code> class. | |
| 64 | + * | |
| 65 | + * @author Ann Wollrath | |
| 66 | + * @author Peter Jones | |
| 67 | + * @author Laird Dornin | |
| 68 | + */ | |
| 69 | +public final class LoaderHandler { | |
| 70 | + | |
| 71 | + /** RMI class loader log level */ | |
| 72 | + static final int logLevel = LogStream.parseLevel( | |
| 73 | + java.security.AccessController.doPrivileged( | |
| 74 | + new GetPropertyAction("sun.rmi.loader.logLevel"))); | |
| 75 | + | |
| 76 | + /* loader system log */ | |
| 77 | + static final Log loaderLog = | |
| 78 | + Log.getLog("sun.rmi.loader", "loader", LoaderHandler.logLevel); | |
| 79 | + | |
| 80 | + /** | |
| 81 | + * value of "java.rmi.server.codebase" property, as cached at class | |
| 82 | + * initialization time. It may contain malformed URLs. | |
| 83 | + */ | |
| 84 | + private static String codebaseProperty = null; | |
| 85 | + static { | |
| 86 | + String prop = java.security.AccessController.doPrivileged( | |
| 87 | + new GetPropertyAction("java.rmi.server.codebase")); | |
| 88 | + if (prop != null && prop.trim().length() > 0) { | |
| 89 | + codebaseProperty = prop; | |
| 90 | + } | |
| 91 | + } | |
| 92 | + | |
| 93 | + /** list of URLs represented by the codebase property, if valid */ | |
| 94 | + private static URL[] codebaseURLs = null; | |
| 95 | + | |
| 96 | + /** table of class loaders that use codebase property for annotation */ | |
| 97 | + private static final Map<ClassLoader, Void> codebaseLoaders = | |
| 98 | + Collections.synchronizedMap(new IdentityHashMap<ClassLoader, Void>(5)); | |
| 99 | + static { | |
| 100 | + for (ClassLoader codebaseLoader = ClassLoader.getSystemClassLoader(); | |
| 101 | + codebaseLoader != null; | |
| 102 | + codebaseLoader = codebaseLoader.getParent()) | |
| 103 | + { | |
| 104 | + codebaseLoaders.put(codebaseLoader, null); | |
| 105 | + } | |
| 106 | + } | |
| 107 | + | |
| 108 | + /** | |
| 109 | + * table mapping codebase URL path and context class loader pairs | |
| 110 | + * to class loader instances. Entries hold class loaders with weak | |
| 111 | + * references, so this table does not prevent loaders from being | |
| 112 | + * garbage collected. | |
| 113 | + */ | |
| 114 | + private static final HashMap<LoaderKey, LoaderEntry> loaderTable | |
| 115 | + = new HashMap<LoaderKey, LoaderEntry>(5); | |
| 116 | + | |
| 117 | + /** reference queue for cleared class loader entries */ | |
| 118 | + private static final ReferenceQueue<Loader> refQueue | |
| 119 | + = new ReferenceQueue<Loader>(); | |
| 120 | + | |
| 121 | + /* | |
| 122 | + * Disallow anyone from creating one of these. | |
| 123 | + */ | |
| 124 | + private LoaderHandler() {} | |
| 125 | + | |
| 126 | + /** | |
| 127 | + * Returns an array of URLs initialized with the value of the | |
| 128 | + * java.rmi.server.codebase property as the URL path. | |
| 129 | + */ | |
| 130 | + private static synchronized URL[] getDefaultCodebaseURLs() | |
| 131 | + throws MalformedURLException | |
| 132 | + { | |
| 133 | + /* | |
| 134 | + * If it hasn't already been done, convert the codebase property | |
| 135 | + * into an array of URLs; this may throw a MalformedURLException. | |
| 136 | + */ | |
| 137 | + if (codebaseURLs == null) { | |
| 138 | + if (codebaseProperty != null) { | |
| 139 | + codebaseURLs = pathToURLs(codebaseProperty); | |
| 140 | + } else { | |
| 141 | + codebaseURLs = new URL[0]; | |
| 142 | + } | |
| 143 | + } | |
| 144 | + return codebaseURLs; | |
| 145 | + } | |
| 146 | + | |
| 147 | + /** | |
| 148 | + * Load a class from a network location (one or more URLs), | |
| 149 | + * but first try to resolve the named class through the given | |
| 150 | + * "default loader". | |
| 151 | + */ | |
| 152 | + public static Class loadClass(String codebase, String name, | |
| 153 | + ClassLoader defaultLoader) | |
| 154 | + throws MalformedURLException, ClassNotFoundException | |
| 155 | + { | |
| 156 | + if (loaderLog.isLoggable(Log.BRIEF)) { | |
| 157 | + loaderLog.log(Log.BRIEF, | |
| 158 | + "name = \"" + name + "\", " + | |
| 159 | + "codebase = \"" + (codebase != null ? codebase : "") + "\"" + | |
| 160 | + (defaultLoader != null ? | |
| 161 | + ", defaultLoader = " + defaultLoader : "")); | |
| 162 | + } | |
| 163 | + | |
| 164 | + URL[] urls; | |
| 165 | + if (codebase != null) { | |
| 166 | + urls = pathToURLs(codebase); | |
| 167 | + } else { | |
| 168 | + urls = getDefaultCodebaseURLs(); | |
| 169 | + } | |
| 170 | + | |
| 171 | + if (defaultLoader != null) { | |
| 172 | + try { | |
| 173 | + Class c = Class.forName(name, false, defaultLoader); | |
| 174 | + if (loaderLog.isLoggable(Log.VERBOSE)) { | |
| 175 | + loaderLog.log(Log.VERBOSE, | |
| 176 | + "class \"" + name + "\" found via defaultLoader, " + | |
| 177 | + "defined by " + c.getClassLoader()); | |
| 178 | + } | |
| 179 | + return c; | |
| 180 | + } catch (ClassNotFoundException e) { | |
| 181 | + } | |
| 182 | + } | |
| 183 | + | |
| 184 | + return loadClass(urls, name); | |
| 185 | + } | |
| 186 | + | |
| 187 | + /** | |
| 188 | + * Returns the class annotation (representing the location for | |
| 189 | + * a class) that RMI will use to annotate the call stream when | |
| 190 | + * marshalling objects of the given class. | |
| 191 | + */ | |
| 192 | + public static String getClassAnnotation(Class cl) { | |
| 193 | + String name = cl.getName(); | |
| 194 | + | |
| 195 | + /* | |
| 196 | + * Class objects for arrays of primitive types never need an | |
| 197 | + * annotation, because they never need to be (or can be) downloaded. | |
| 198 | + * | |
| 199 | + * REMIND: should we (not) be annotating classes that are in | |
| 200 | + * "java.*" packages? | |
| 201 | + */ | |
| 202 | + int nameLength = name.length(); | |
| 203 | + if (nameLength > 0 && name.charAt(0) == '[') { | |
| 204 | + // skip past all '[' characters (see bugid 4211906) | |
| 205 | + int i = 1; | |
| 206 | + while (nameLength > i && name.charAt(i) == '[') { | |
| 207 | + i++; | |
| 208 | + } | |
| 209 | + if (nameLength > i && name.charAt(i) != 'L') { | |
| 210 | + return null; | |
| 211 | + } | |
| 212 | + } | |
| 213 | + | |
| 214 | + /* | |
| 215 | + * Get the class's class loader. If it is null, the system class | |
| 216 | + * loader, an ancestor of the base class loader (such as the loader | |
| 217 | + * for installed extensions), return the value of the | |
| 218 | + * "java.rmi.server.codebase" property. | |
| 219 | + */ | |
| 220 | + ClassLoader loader = cl.getClassLoader(); | |
| 221 | + if (loader == null || codebaseLoaders.containsKey(loader)) { | |
| 222 | + return codebaseProperty; | |
| 223 | + } | |
| 224 | + | |
| 225 | + /* | |
| 226 | + * Get the codebase URL path for the class loader, if it supports | |
| 227 | + * such a notion (i.e., if it is a URLClassLoader or subclass). | |
| 228 | + */ | |
| 229 | + String annotation = null; | |
| 230 | + if (loader instanceof Loader) { | |
| 231 | + /* | |
| 232 | + * If the class loader is one of our RMI class loaders, we have | |
| 233 | + * already computed the class annotation string, and no | |
| 234 | + * permissions are required to know the URLs. | |
| 235 | + */ | |
| 236 | + annotation = ((Loader) loader).getClassAnnotation(); | |
| 237 | + | |
| 238 | + } else if (loader instanceof URLClassLoader) { | |
| 239 | + try { | |
| 240 | + URL[] urls = ((URLClassLoader) loader).getURLs(); | |
| 241 | + if (urls != null) { | |
| 242 | + /* | |
| 243 | + * If the class loader is not one of our RMI class loaders, | |
| 244 | + * we must verify that the current access control context | |
| 245 | + * has permission to know all of these URLs. | |
| 246 | + */ | |
| 247 | + SecurityManager sm = System.getSecurityManager(); | |
| 248 | + if (sm != null) { | |
| 249 | + Permissions perms = new Permissions(); | |
| 250 | + for (int i = 0; i < urls.length; i++) { | |
| 251 | + Permission p = | |
| 252 | + urls[i].openConnection().getPermission(); | |
| 253 | + if (p != null) { | |
| 254 | + if (!perms.implies(p)) { | |
| 255 | + sm.checkPermission(p); | |
| 256 | + perms.add(p); | |
| 257 | + } | |
| 258 | + } | |
| 259 | + } | |
| 260 | + } | |
| 261 | + | |
| 262 | + annotation = urlsToPath(urls); | |
| 263 | + } | |
| 264 | + } catch (SecurityException e) { | |
| 265 | + /* | |
| 266 | + * If access was denied to the knowledge of the class | |
| 267 | + * loader's URLs, fall back to the default behavior. | |
| 268 | + */ | |
| 269 | + } catch (IOException e) { | |
| 270 | + /* | |
| 271 | + * This shouldn't happen, although it is declared to be | |
| 272 | + * thrown by openConnection() and getPermission(). If it | |
| 273 | + * does happen, forget about this class loader's URLs and | |
| 274 | + * fall back to the default behavior. | |
| 275 | + */ | |
| 276 | + } | |
| 277 | + } | |
| 278 | + | |
| 279 | + if (annotation != null) { | |
| 280 | + return annotation; | |
| 281 | + } else { | |
| 282 | + return codebaseProperty; // REMIND: does this make sense?? | |
| 283 | + } | |
| 284 | + } | |
| 285 | + | |
| 286 | + /** | |
| 287 | + * Returns a classloader that loads classes from the given codebase URL | |
| 288 | + * path. The parent classloader of the returned classloader is the | |
| 289 | + * context class loader. | |
| 290 | + */ | |
| 291 | + public static ClassLoader getClassLoader(String codebase) | |
| 292 | + throws MalformedURLException | |
| 293 | + { | |
| 294 | + ClassLoader parent = getRMIContextClassLoader(); | |
| 295 | + | |
| 296 | + URL[] urls; | |
| 297 | + if (codebase != null) { | |
| 298 | + urls = pathToURLs(codebase); | |
| 299 | + } else { | |
| 300 | + urls = getDefaultCodebaseURLs(); | |
| 301 | + } | |
| 302 | + | |
| 303 | + /* | |
| 304 | + * If there is a security manager, the current access control | |
| 305 | + * context must have the "getClassLoader" RuntimePermission. | |
| 306 | + */ | |
| 307 | + SecurityManager sm = System.getSecurityManager(); | |
| 308 | + if (sm != null) { | |
| 309 | + sm.checkPermission(new RuntimePermission("getClassLoader")); | |
| 310 | + } else { | |
| 311 | + /* | |
| 312 | + * But if no security manager is set, disable access to | |
| 313 | + * RMI class loaders and simply return the parent loader. | |
| 314 | + */ | |
| 315 | + return parent; | |
| 316 | + } | |
| 317 | + | |
| 318 | + Loader loader = lookupLoader(urls, parent); | |
| 319 | + | |
| 320 | + /* | |
| 321 | + * Verify that the caller has permission to access this loader. | |
| 322 | + */ | |
| 323 | + if (loader != null) { | |
| 324 | + loader.checkPermissions(); | |
| 325 | + } | |
| 326 | + | |
| 327 | + return loader; | |
| 328 | + } | |
| 329 | + | |
| 330 | + /** | |
| 331 | + * Return the security context of the given class loader. | |
| 332 | + */ | |
| 333 | + public static Object getSecurityContext(ClassLoader loader) { | |
| 334 | + /* | |
| 335 | + * REMIND: This is a bogus JDK1.1-compatible implementation. | |
| 336 | + * This method should never be called by application code anyway | |
| 337 | + * (hence the deprecation), but should it do something different | |
| 338 | + * and perhaps more useful, like return a String or a URL[]? | |
| 339 | + */ | |
| 340 | + if (loader instanceof Loader) { | |
| 341 | + URL[] urls = ((Loader) loader).getURLs(); | |
| 342 | + if (urls.length > 0) { | |
| 343 | + return urls[0]; | |
| 344 | + } | |
| 345 | + } | |
| 346 | + return null; | |
| 347 | + } | |
| 348 | + | |
| 349 | + /** | |
| 350 | + * Register a class loader as one whose classes should always be | |
| 351 | + * annotated with the value of the "java.rmi.server.codebase" property. | |
| 352 | + */ | |
| 353 | + public static void registerCodebaseLoader(ClassLoader loader) { | |
| 354 | + codebaseLoaders.put(loader, null); | |
| 355 | + } | |
| 356 | + | |
| 357 | + /** | |
| 358 | + * Load a class from the RMI class loader corresponding to the given | |
| 359 | + * codebase URL path in the current execution context. | |
| 360 | + */ | |
| 361 | + private static Class loadClass(URL[] urls, String name) | |
| 362 | + throws ClassNotFoundException | |
| 363 | + { | |
| 364 | + ClassLoader parent = getRMIContextClassLoader(); | |
| 365 | + if (loaderLog.isLoggable(Log.VERBOSE)) { | |
| 366 | + loaderLog.log(Log.VERBOSE, | |
| 367 | + "(thread context class loader: " + parent + ")"); | |
| 368 | + } | |
| 369 | + | |
| 370 | + /* | |
| 371 | + * If no security manager is set, disable access to RMI class | |
| 372 | + * loaders and simply delegate request to the parent loader | |
| 373 | + * (see bugid 4140511). | |
| 374 | + */ | |
| 375 | + SecurityManager sm = System.getSecurityManager(); | |
| 376 | + if (sm == null) { | |
| 377 | + try { | |
| 378 | + Class c = Class.forName(name, false, parent); | |
| 379 | + if (loaderLog.isLoggable(Log.VERBOSE)) { | |
| 380 | + loaderLog.log(Log.VERBOSE, | |
| 381 | + "class \"" + name + "\" found via " + | |
| 382 | + "thread context class loader " + | |
| 383 | + "(no security manager: codebase disabled), " + | |
| 384 | + "defined by " + c.getClassLoader()); | |
| 385 | + } | |
| 386 | + return c; | |
| 387 | + } catch (ClassNotFoundException e) { | |
| 388 | + if (loaderLog.isLoggable(Log.BRIEF)) { | |
| 389 | + loaderLog.log(Log.BRIEF, | |
| 390 | + "class \"" + name + "\" not found via " + | |
| 391 | + "thread context class loader " + | |
| 392 | + "(no security manager: codebase disabled)", e); | |
| 393 | + } | |
| 394 | + throw new ClassNotFoundException(e.getMessage() + | |
| 395 | + " (no security manager: RMI class loader disabled)", | |
| 396 | + e.getException()); | |
| 397 | + } | |
| 398 | + } | |
| 399 | + | |
| 400 | + /* | |
| 401 | + * Get or create the RMI class loader for this codebase URL path | |
| 402 | + * and parent class loader pair. | |
| 403 | + */ | |
| 404 | + Loader loader = lookupLoader(urls, parent); | |
| 405 | + | |
| 406 | + try { | |
| 407 | + if (loader != null) { | |
| 408 | + /* | |
| 409 | + * Verify that the caller has permission to access this loader. | |
| 410 | + */ | |
| 411 | + loader.checkPermissions(); | |
| 412 | + } | |
| 413 | + } catch (SecurityException e) { | |
| 414 | + /* | |
| 415 | + * If the current access control context does not have permission | |
| 416 | + * to access all of the URLs in the codebase path, wrap the | |
| 417 | + * resulting security exception in a ClassNotFoundException, so | |
| 418 | + * the caller can handle this outcome just like any other class | |
| 419 | + * loading failure (see bugid 4146529). | |
| 420 | + */ | |
| 421 | + try { | |
| 422 | + /* | |
| 423 | + * But first, check to see if the named class could have been | |
| 424 | + * resolved without the security-offending codebase anyway; | |
| 425 | + * if so, return successfully (see bugids 4191926 & 4349670). | |
| 426 | + */ | |
| 427 | + Class c = Class.forName(name, false, parent); | |
| 428 | + if (loaderLog.isLoggable(Log.VERBOSE)) { | |
| 429 | + loaderLog.log(Log.VERBOSE, | |
| 430 | + "class \"" + name + "\" found via " + | |
| 431 | + "thread context class loader " + | |
| 432 | + "(access to codebase denied), " + | |
| 433 | + "defined by " + c.getClassLoader()); | |
| 434 | + } | |
| 435 | + return c; | |
| 436 | + } catch (ClassNotFoundException unimportant) { | |
| 437 | + /* | |
| 438 | + * Presumably the security exception is the more important | |
| 439 | + * exception to report in this case. | |
| 440 | + */ | |
| 441 | + if (loaderLog.isLoggable(Log.BRIEF)) { | |
| 442 | + loaderLog.log(Log.BRIEF, | |
| 443 | + "class \"" + name + "\" not found via " + | |
| 444 | + "thread context class loader " + | |
| 445 | + "(access to codebase denied)", e); | |
| 446 | + } | |
| 447 | + throw new ClassNotFoundException( | |
| 448 | + "access to class loader denied", e); | |
| 449 | + } | |
| 450 | + } | |
| 451 | + | |
| 452 | + try { | |
| 453 | + Class c = Class.forName(name, false, loader); | |
| 454 | + if (loaderLog.isLoggable(Log.VERBOSE)) { | |
| 455 | + loaderLog.log(Log.VERBOSE, | |
| 456 | + "class \"" + name + "\" " + "found via codebase, " + | |
| 457 | + "defined by " + c.getClassLoader()); | |
| 458 | + } | |
| 459 | + return c; | |
| 460 | + } catch (ClassNotFoundException e) { | |
| 461 | + if (loaderLog.isLoggable(Log.BRIEF)) { | |
| 462 | + loaderLog.log(Log.BRIEF, | |
| 463 | + "class \"" + name + "\" not found via codebase", e); | |
| 464 | + } | |
| 465 | + throw e; | |
| 466 | + } | |
| 467 | + } | |
| 468 | + | |
| 469 | + /** | |
| 470 | + * Define and return a dynamic proxy class in a class loader with | |
| 471 | + * URLs supplied in the given location. The proxy class will | |
| 472 | + * implement interface classes named by the given array of | |
| 473 | + * interface names. | |
| 474 | + */ | |
| 475 | + public static Class loadProxyClass(String codebase, String[] interfaces, | |
| 476 | + ClassLoader defaultLoader) | |
| 477 | + throws MalformedURLException, ClassNotFoundException | |
| 478 | + { | |
| 479 | + if (loaderLog.isLoggable(Log.BRIEF)) { | |
| 480 | + loaderLog.log(Log.BRIEF, | |
| 481 | + "interfaces = " + Arrays.asList(interfaces) + ", " + | |
| 482 | + "codebase = \"" + (codebase != null ? codebase : "") + "\"" + | |
| 483 | + (defaultLoader != null ? | |
| 484 | + ", defaultLoader = " + defaultLoader : "")); | |
| 485 | + } | |
| 486 | + | |
| 487 | + /* | |
| 488 | + * This method uses a fairly complex algorithm to load the | |
| 489 | + * proxy class and its interface classes in order to maximize | |
| 490 | + * the likelihood that the proxy's codebase annotation will be | |
| 491 | + * preserved. The algorithm is (assuming that all of the | |
| 492 | + * proxy interface classes are public): | |
| 493 | + * | |
| 494 | + * If the default loader is not null, try to load the proxy | |
| 495 | + * interfaces through that loader. If the interfaces can be | |
| 496 | + * loaded in that loader, try to define the proxy class in an | |
| 497 | + * RMI class loader (child of the context class loader) before | |
| 498 | + * trying to define the proxy in the default loader. If the | |
| 499 | + * attempt to define the proxy class succeeds, the codebase | |
| 500 | + * annotation is preserved. If the attempt fails, try to | |
| 501 | + * define the proxy class in the default loader. | |
| 502 | + * | |
| 503 | + * If the interface classes can not be loaded from the default | |
| 504 | + * loader or the default loader is null, try to load them from | |
| 505 | + * the RMI class loader. Then try to define the proxy class | |
| 506 | + * in the RMI class loader. | |
| 507 | + * | |
| 508 | + * Additionally, if any of the proxy interface classes are not | |
| 509 | + * public, all of the non-public interfaces must reside in the | |
| 510 | + * same class loader or it will be impossible to define the | |
| 511 | + * proxy class (an IllegalAccessError will be thrown). An | |
| 512 | + * attempt to load the interfaces from the default loader is | |
| 513 | + * made. If the attempt fails, a second attempt will be made | |
| 514 | + * to load the interfaces from the RMI loader. If all of the | |
| 515 | + * non-public interfaces classes do reside in the same class | |
| 516 | + * loader, then we attempt to define the proxy class in the | |
| 517 | + * class loader of the non-public interfaces. No other | |
| 518 | + * attempt to define the proxy class will be made. | |
| 519 | + */ | |
| 520 | + ClassLoader parent = getRMIContextClassLoader(); | |
| 521 | + if (loaderLog.isLoggable(Log.VERBOSE)) { | |
| 522 | + loaderLog.log(Log.VERBOSE, | |
| 523 | + "(thread context class loader: " + parent + ")"); | |
| 524 | + } | |
| 525 | + | |
| 526 | + URL[] urls; | |
| 527 | + if (codebase != null) { | |
| 528 | + urls = pathToURLs(codebase); | |
| 529 | + } else { | |
| 530 | + urls = getDefaultCodebaseURLs(); | |
| 531 | + } | |
| 532 | + | |
| 533 | + /* | |
| 534 | + * If no security manager is set, disable access to RMI class | |
| 535 | + * loaders and use the would-de parent instead. | |
| 536 | + */ | |
| 537 | + SecurityManager sm = System.getSecurityManager(); | |
| 538 | + if (sm == null) { | |
| 539 | + try { | |
| 540 | + Class c = loadProxyClass(interfaces, defaultLoader, parent, | |
| 541 | + false); | |
| 542 | + if (loaderLog.isLoggable(Log.VERBOSE)) { | |
| 543 | + loaderLog.log(Log.VERBOSE, | |
| 544 | + "(no security manager: codebase disabled) " + | |
| 545 | + "proxy class defined by " + c.getClassLoader()); | |
| 546 | + } | |
| 547 | + return c; | |
| 548 | + } catch (ClassNotFoundException e) { | |
| 549 | + if (loaderLog.isLoggable(Log.BRIEF)) { | |
| 550 | + loaderLog.log(Log.BRIEF, | |
| 551 | + "(no security manager: codebase disabled) " + | |
| 552 | + "proxy class resolution failed", e); | |
| 553 | + } | |
| 554 | + throw new ClassNotFoundException(e.getMessage() + | |
| 555 | + " (no security manager: RMI class loader disabled)", | |
| 556 | + e.getException()); | |
| 557 | + } | |
| 558 | + } | |
| 559 | + | |
| 560 | + /* | |
| 561 | + * Get or create the RMI class loader for this codebase URL path | |
| 562 | + * and parent class loader pair. | |
| 563 | + */ | |
| 564 | + Loader loader = lookupLoader(urls, parent); | |
| 565 | + | |
| 566 | + try { | |
| 567 | + if (loader != null) { | |
| 568 | + /* | |
| 569 | + * Verify that the caller has permission to access this loader. | |
| 570 | + */ | |
| 571 | + loader.checkPermissions(); | |
| 572 | + } | |
| 573 | + } catch (SecurityException e) { | |
| 574 | + /* | |
| 575 | + * If the current access control context does not have permission | |
| 576 | + * to access all of the URLs in the codebase path, wrap the | |
| 577 | + * resulting security exception in a ClassNotFoundException, so | |
| 578 | + * the caller can handle this outcome just like any other class | |
| 579 | + * loading failure (see bugid 4146529). | |
| 580 | + */ | |
| 581 | + try { | |
| 582 | + /* | |
| 583 | + * But first, check to see if the proxy class could have been | |
| 584 | + * resolved without the security-offending codebase anyway; | |
| 585 | + * if so, return successfully (see bugids 4191926 & 4349670). | |
| 586 | + */ | |
| 587 | + Class c = loadProxyClass(interfaces, defaultLoader, parent, | |
| 588 | + false); | |
| 589 | + if (loaderLog.isLoggable(Log.VERBOSE)) { | |
| 590 | + loaderLog.log(Log.VERBOSE, | |
| 591 | + "(access to codebase denied) " + | |
| 592 | + "proxy class defined by " + c.getClassLoader()); | |
| 593 | + } | |
| 594 | + return c; | |
| 595 | + } catch (ClassNotFoundException unimportant) { | |
| 596 | + /* | |
| 597 | + * Presumably the security exception is the more important | |
| 598 | + * exception to report in this case. | |
| 599 | + */ | |
| 600 | + if (loaderLog.isLoggable(Log.BRIEF)) { | |
| 601 | + loaderLog.log(Log.BRIEF, | |
| 602 | + "(access to codebase denied) " + | |
| 603 | + "proxy class resolution failed", e); | |
| 604 | + } | |
| 605 | + throw new ClassNotFoundException( | |
| 606 | + "access to class loader denied", e); | |
| 607 | + } | |
| 608 | + } | |
| 609 | + | |
| 610 | + try { | |
| 611 | + Class c = loadProxyClass(interfaces, defaultLoader, loader, true); | |
| 612 | + if (loaderLog.isLoggable(Log.VERBOSE)) { | |
| 613 | + loaderLog.log(Log.VERBOSE, | |
| 614 | + "proxy class defined by " + c.getClassLoader()); | |
| 615 | + } | |
| 616 | + return c; | |
| 617 | + } catch (ClassNotFoundException e) { | |
| 618 | + if (loaderLog.isLoggable(Log.BRIEF)) { | |
| 619 | + loaderLog.log(Log.BRIEF, | |
| 620 | + "proxy class resolution failed", e); | |
| 621 | + } | |
| 622 | + throw e; | |
| 623 | + } | |
| 624 | + } | |
| 625 | + | |
| 626 | + /** | |
| 627 | + * Define a proxy class in the default loader if appropriate. | |
| 628 | + * Define the class in an RMI class loader otherwise. The proxy | |
| 629 | + * class will implement classes which are named in the supplied | |
| 630 | + * interfaceNames. | |
| 631 | + */ | |
| 632 | + private static Class loadProxyClass(String[] interfaceNames, | |
| 633 | + ClassLoader defaultLoader, | |
| 634 | + ClassLoader codebaseLoader, | |
| 635 | + boolean preferCodebase) | |
| 636 | + throws ClassNotFoundException | |
| 637 | + { | |
| 638 | + ClassLoader proxyLoader = null; | |
| 639 | + Class[] classObjs = new Class[interfaceNames.length]; | |
| 640 | + boolean[] nonpublic = { false }; | |
| 641 | + | |
| 642 | + defaultLoaderCase: | |
| 643 | + if (defaultLoader != null) { | |
| 644 | + try { | |
| 645 | + proxyLoader = | |
| 646 | + loadProxyInterfaces(interfaceNames, defaultLoader, | |
| 647 | + classObjs, nonpublic); | |
| 648 | + if (loaderLog.isLoggable(Log.VERBOSE)) { | |
| 649 | + ClassLoader[] definingLoaders = | |
| 650 | + new ClassLoader[classObjs.length]; | |
| 651 | + for (int i = 0; i < definingLoaders.length; i++) { | |
| 652 | + definingLoaders[i] = classObjs[i].getClassLoader(); | |
| 653 | + } | |
| 654 | + loaderLog.log(Log.VERBOSE, | |
| 655 | + "proxy interfaces found via defaultLoader, " + | |
| 656 | + "defined by " + Arrays.asList(definingLoaders)); | |
| 657 | + } | |
| 658 | + } catch (ClassNotFoundException e) { | |
| 659 | + break defaultLoaderCase; | |
| 660 | + } | |
| 661 | + if (!nonpublic[0]) { | |
| 662 | + if (preferCodebase) { | |
| 663 | + try { | |
| 664 | + return Proxy.getProxyClass(codebaseLoader, classObjs); | |
| 665 | + } catch (IllegalArgumentException e) { | |
| 666 | + } | |
| 667 | + } | |
| 668 | + proxyLoader = defaultLoader; | |
| 669 | + } | |
| 670 | + return loadProxyClass(proxyLoader, classObjs); | |
| 671 | + } | |
| 672 | + | |
| 673 | + nonpublic[0] = false; | |
| 674 | + proxyLoader = loadProxyInterfaces(interfaceNames, codebaseLoader, | |
| 675 | + classObjs, nonpublic); | |
| 676 | + if (loaderLog.isLoggable(Log.VERBOSE)) { | |
| 677 | + ClassLoader[] definingLoaders = new ClassLoader[classObjs.length]; | |
| 678 | + for (int i = 0; i < definingLoaders.length; i++) { | |
| 679 | + definingLoaders[i] = classObjs[i].getClassLoader(); | |
| 680 | + } | |
| 681 | + loaderLog.log(Log.VERBOSE, | |
| 682 | + "proxy interfaces found via codebase, " + | |
| 683 | + "defined by " + Arrays.asList(definingLoaders)); | |
| 684 | + } | |
| 685 | + if (!nonpublic[0]) { | |
| 686 | + proxyLoader = codebaseLoader; | |
| 687 | + } | |
| 688 | + return loadProxyClass(proxyLoader, classObjs); | |
| 689 | + } | |
| 690 | + | |
| 691 | + /** | |
| 692 | + * Define a proxy class in the given class loader. The proxy | |
| 693 | + * class will implement the given interfaces Classes. | |
| 694 | + */ | |
| 695 | + private static Class loadProxyClass(ClassLoader loader, Class[] interfaces) | |
| 696 | + throws ClassNotFoundException | |
| 697 | + { | |
| 698 | + try { | |
| 699 | + return Proxy.getProxyClass(loader, interfaces); | |
| 700 | + } catch (IllegalArgumentException e) { | |
| 701 | + throw new ClassNotFoundException( | |
| 702 | + "error creating dynamic proxy class", e); | |
| 703 | + } | |
| 704 | + } | |
| 705 | + | |
| 706 | + /* | |
| 707 | + * Load Class objects for the names in the interfaces array fron | |
| 708 | + * the given class loader. | |
| 709 | + * | |
| 710 | + * We pass classObjs and nonpublic arrays to avoid needing a | |
| 711 | + * multi-element return value. nonpublic is an array to enable | |
| 712 | + * the method to take a boolean argument by reference. | |
| 713 | + * | |
| 714 | + * nonpublic array is needed to signal when the return value of | |
| 715 | + * this method should be used as the proxy class loader. Because | |
| 716 | + * null represents a valid class loader, that value is | |
| 717 | + * insufficient to signal that the return value should not be used | |
| 718 | + * as the proxy class loader. | |
| 719 | + */ | |
| 720 | + private static ClassLoader loadProxyInterfaces(String[] interfaces, | |
| 721 | + ClassLoader loader, | |
| 722 | + Class[] classObjs, | |
| 723 | + boolean[] nonpublic) | |
| 724 | + throws ClassNotFoundException | |
| 725 | + { | |
| 726 | + /* loader of a non-public interface class */ | |
| 727 | + ClassLoader nonpublicLoader = null; | |
| 728 | + | |
| 729 | + for (int i = 0; i < interfaces.length; i++) { | |
| 730 | + Class cl = | |
| 731 | + (classObjs[i] = Class.forName(interfaces[i], false, loader)); | |
| 732 | + | |
| 733 | + if (!Modifier.isPublic(cl.getModifiers())) { | |
| 734 | + ClassLoader current = cl.getClassLoader(); | |
| 735 | + if (loaderLog.isLoggable(Log.VERBOSE)) { | |
| 736 | + loaderLog.log(Log.VERBOSE, | |
| 737 | + "non-public interface \"" + interfaces[i] + | |
| 738 | + "\" defined by " + current); | |
| 739 | + } | |
| 740 | + if (!nonpublic[0]) { | |
| 741 | + nonpublicLoader = current; | |
| 742 | + nonpublic[0] = true; | |
| 743 | + } else if (current != nonpublicLoader) { | |
| 744 | + throw new IllegalAccessError( | |
| 745 | + "non-public interfaces defined in different " + | |
| 746 | + "class loaders"); | |
| 747 | + } | |
| 748 | + } | |
| 749 | + } | |
| 750 | + return nonpublicLoader; | |
| 751 | + } | |
| 752 | + | |
| 753 | + /** | |
| 754 | + * Convert a string containing a space-separated list of URLs into a | |
| 755 | + * corresponding array of URL objects, throwing a MalformedURLException | |
| 756 | + * if any of the URLs are invalid. | |
| 757 | + */ | |
| 758 | + private static URL[] pathToURLs(String path) | |
| 759 | + throws MalformedURLException | |
| 760 | + { | |
| 761 | + synchronized (pathToURLsCache) { | |
| 762 | + Object[] v = pathToURLsCache.get(path); | |
| 763 | + if (v != null) { | |
| 764 | + return ((URL[])v[0]); | |
| 765 | + } | |
| 766 | + } | |
| 767 | + StringTokenizer st = new StringTokenizer(path); // divide by spaces | |
| 768 | + URL[] urls = new URL[st.countTokens()]; | |
| 769 | + for (int i = 0; st.hasMoreTokens(); i++) { | |
| 770 | + urls[i] = new URL(st.nextToken()); | |
| 771 | + } | |
| 772 | + synchronized (pathToURLsCache) { | |
| 773 | + pathToURLsCache.put(path, | |
| 774 | + new Object[] {urls, new SoftReference<String>(path)}); | |
| 775 | + } | |
| 776 | + return urls; | |
| 777 | + } | |
| 778 | + | |
| 779 | + /** map from weak(key=string) to [URL[], soft(key)] */ | |
| 780 | + private static final Map<String, Object[]> pathToURLsCache | |
| 781 | + = new WeakHashMap<String, Object[]>(5); | |
| 782 | + | |
| 783 | + /** | |
| 784 | + * Convert an array of URL objects into a corresponding string | |
| 785 | + * containing a space-separated list of URLs. | |
| 786 | + * | |
| 787 | + * Note that if the array has zero elements, the return value is | |
| 788 | + * null, not the empty string. | |
| 789 | + */ | |
| 790 | + private static String urlsToPath(URL[] urls) { | |
| 791 | + if (urls.length == 0) { | |
| 792 | + return null; | |
| 793 | + } else if (urls.length == 1) { | |
| 794 | + return urls[0].toExternalForm(); | |
| 795 | + } else { | |
| 796 | + StringBuffer path = new StringBuffer(urls[0].toExternalForm()); | |
| 797 | + for (int i = 1; i < urls.length; i++) { | |
| 798 | + path.append(' '); | |
| 799 | + path.append(urls[i].toExternalForm()); | |
| 800 | + } | |
| 801 | + return path.toString(); | |
| 802 | + } | |
| 803 | + } | |
| 804 | + | |
| 805 | + /** | |
| 806 | + * Return the class loader to be used as the parent for an RMI class | |
| 807 | + * loader used in the current execution context. | |
| 808 | + */ | |
| 809 | + private static ClassLoader getRMIContextClassLoader() { | |
| 810 | + /* | |
| 811 | + * The current implementation simply uses the current thread's | |
| 812 | + * context class loader. | |
| 813 | + */ | |
| 814 | + return Thread.currentThread().getContextClassLoader(); | |
| 815 | + } | |
| 816 | + | |
| 817 | + /** | |
| 818 | + * Look up the RMI class loader for the given codebase URL path | |
| 819 | + * and the given parent class loader. A new class loader instance | |
| 820 | + * will be created and returned if no match is found. | |
| 821 | + */ | |
| 822 | + private static Loader lookupLoader(final URL[] urls, | |
| 823 | + final ClassLoader parent) | |
| 824 | + { | |
| 825 | + /* | |
| 826 | + * If the requested codebase URL path is empty, the supplied | |
| 827 | + * parent class loader will be sufficient. | |
| 828 | + * | |
| 829 | + * REMIND: To be conservative, this optimization is commented out | |
| 830 | + * for now so that it does not open a security hole in the future | |
| 831 | + * by providing untrusted code with direct access to the public | |
| 832 | + * loadClass() method of a class loader instance that it cannot | |
| 833 | + * get a reference to. (It's an unlikely optimization anyway.) | |
| 834 | + * | |
| 835 | + * if (urls.length == 0) { | |
| 836 | + * return parent; | |
| 837 | + * } | |
| 838 | + */ | |
| 839 | + | |
| 840 | + LoaderEntry entry; | |
| 841 | + Loader loader; | |
| 842 | + | |
| 843 | + synchronized (LoaderHandler.class) { | |
| 844 | + /* | |
| 845 | + * Take this opportunity to remove from the table entries | |
| 846 | + * whose weak references have been cleared. | |
| 847 | + */ | |
| 848 | + while ((entry = (LoaderEntry) refQueue.poll()) != null) { | |
| 849 | + if (!entry.removed) { // ignore entries removed below | |
| 850 | + loaderTable.remove(entry.key); | |
| 851 | + } | |
| 852 | + } | |
| 853 | + | |
| 854 | + /* | |
| 855 | + * Look up the codebase URL path and parent class loader pair | |
| 856 | + * in the table of RMI class loaders. | |
| 857 | + */ | |
| 858 | + LoaderKey key = new LoaderKey(urls, parent); | |
| 859 | + entry = loaderTable.get(key); | |
| 860 | + | |
| 861 | + if (entry == null || (loader = entry.get()) == null) { | |
| 862 | + /* | |
| 863 | + * If entry was in table but it's weak reference was cleared, | |
| 864 | + * remove it from the table and mark it as explicitly cleared, | |
| 865 | + * so that new matching entry that we put in the table will | |
| 866 | + * not be erroneously removed when this entry is processed | |
| 867 | + * from the weak reference queue. | |
| 868 | + */ | |
| 869 | + if (entry != null) { | |
| 870 | + loaderTable.remove(key); | |
| 871 | + entry.removed = true; | |
| 872 | + } | |
| 873 | + | |
| 874 | + /* | |
| 875 | + * A matching loader was not found, so create a new class | |
| 876 | + * loader instance for the requested codebase URL path and | |
| 877 | + * parent class loader. The instance is created within an | |
| 878 | + * access control context retricted to the permissions | |
| 879 | + * necessary to load classes from its codebase URL path. | |
| 880 | + */ | |
| 881 | + AccessControlContext acc = getLoaderAccessControlContext(urls); | |
| 882 | + loader = java.security.AccessController.doPrivileged( | |
| 883 | + new java.security.PrivilegedAction<Loader>() { | |
| 884 | + public Loader run() { | |
| 885 | + return new Loader(urls, parent); | |
| 886 | + } | |
| 887 | + }, acc); | |
| 888 | + | |
| 889 | + /* | |
| 890 | + * Finally, create an entry to hold the new loader with a | |
| 891 | + * weak reference and store it in the table with the key. | |
| 892 | + */ | |
| 893 | + entry = new LoaderEntry(key, loader); | |
| 894 | + loaderTable.put(key, entry); | |
| 895 | + } | |
| 896 | + } | |
| 897 | + | |
| 898 | + return loader; | |
| 899 | + } | |
| 900 | + | |
| 901 | + /** | |
| 902 | + * LoaderKey holds a codebase URL path and parent class loader pair | |
| 903 | + * used to look up RMI class loader instances in its class loader cache. | |
| 904 | + */ | |
| 905 | + private static class LoaderKey { | |
| 906 | + | |
| 907 | + private URL[] urls; | |
| 908 | + | |
| 909 | + private ClassLoader parent; | |
| 910 | + | |
| 911 | + private int hashValue; | |
| 912 | + | |
| 913 | + public LoaderKey(URL[] urls, ClassLoader parent) { | |
| 914 | + this.urls = urls; | |
| 915 | + this.parent = parent; | |
| 916 | + | |
| 917 | + if (parent != null) { | |
| 918 | + hashValue = parent.hashCode(); | |
| 919 | + } | |
| 920 | + for (int i = 0; i < urls.length; i++) { | |
| 921 | + hashValue ^= urls[i].hashCode(); | |
| 922 | + } | |
| 923 | + } | |
| 924 | + | |
| 925 | + public int hashCode() { | |
| 926 | + return hashValue; | |
| 927 | + } | |
| 928 | + | |
| 929 | + public boolean equals(Object obj) { | |
| 930 | + if (obj instanceof LoaderKey) { | |
| 931 | + LoaderKey other = (LoaderKey) obj; | |
| 932 | + if (parent != other.parent) { | |
| 933 | + return false; | |
| 934 | + } | |
| 935 | + if (urls == other.urls) { | |
| 936 | + return true; | |
| 937 | + } | |
| 938 | + if (urls.length != other.urls.length) { | |
| 939 | + return false; | |
| 940 | + } | |
| 941 | + for (int i = 0; i < urls.length; i++) { | |
| 942 | + if (!urls[i].equals(other.urls[i])) { | |
| 943 | + return false; | |
| 944 | + } | |
| 945 | + } | |
| 946 | + return true; | |
| 947 | + } else { | |
| 948 | + return false; | |
| 949 | + } | |
| 950 | + } | |
| 951 | + } | |
| 952 | + | |
| 953 | + /** | |
| 954 | + * LoaderEntry contains a weak reference to an RMIClassLoader. The | |
| 955 | + * weak reference is registered with the private static "refQueue" | |
| 956 | + * queue. The entry contains the codebase URL path and parent class | |
| 957 | + * loader key for the loader so that the mapping can be removed from | |
| 958 | + * the table efficiently when the weak reference is cleared. | |
| 959 | + */ | |
| 960 | + private static class LoaderEntry extends WeakReference<Loader> { | |
| 961 | + | |
| 962 | + public LoaderKey key; | |
| 963 | + | |
| 964 | + /** | |
| 965 | + * set to true if the entry has been removed from the table | |
| 966 | + * because it has been replaced, so it should not be attempted | |
| 967 | + * to be removed again | |
| 968 | + */ | |
| 969 | + public boolean removed = false; | |
| 970 | + | |
| 971 | + public LoaderEntry(LoaderKey key, Loader loader) { | |
| 972 | + super(loader, refQueue); | |
| 973 | + this.key = key; | |
| 974 | + } | |
| 975 | + } | |
| 976 | + | |
| 977 | + /** | |
| 978 | + * Return the access control context that a loader for the given | |
| 979 | + * codebase URL path should execute with. | |
| 980 | + */ | |
| 981 | + private static AccessControlContext getLoaderAccessControlContext( | |
| 982 | + URL[] urls) | |
| 983 | + { | |
| 984 | + /* | |
| 985 | + * The approach used here is taken from the similar method | |
| 986 | + * getAccessControlContext() in the sun.applet.AppletPanel class. | |
| 987 | + */ | |
| 988 | + // begin with permissions granted to all code in current policy | |
| 989 | + PermissionCollection perms = | |
| 990 | + java.security.AccessController.doPrivileged( | |
| 991 | + new java.security.PrivilegedAction<PermissionCollection>() { | |
| 992 | + public PermissionCollection run() { | |
| 993 | + CodeSource codesource = new CodeSource(null, | |
| 994 | + (java.security.cert.Certificate[]) null); | |
| 995 | + Policy p = java.security.Policy.getPolicy(); | |
| 996 | + if (p != null) { | |
| 997 | + return p.getPermissions(codesource); | |
| 998 | + } else { | |
| 999 | + return new Permissions(); | |
| 1000 | + } | |
| 1001 | + } | |
| 1002 | + }); | |
| 1003 | + | |
| 1004 | + // createClassLoader permission needed to create loader in context | |
| 1005 | + perms.add(new RuntimePermission("createClassLoader")); | |
| 1006 | + | |
| 1007 | + // add permissions to read any "java.*" property | |
| 1008 | + perms.add(new java.util.PropertyPermission("java.*","read")); | |
| 1009 | + | |
| 1010 | + // add permissions reuiqred to load from codebase URL path | |
| 1011 | + addPermissionsForURLs(urls, perms, true); | |
| 1012 | + | |
| 1013 | + /* | |
| 1014 | + * Create an AccessControlContext that consists of a single | |
| 1015 | + * protection domain with only the permissions calculated above. | |
| 1016 | + */ | |
| 1017 | + ProtectionDomain pd = new ProtectionDomain( | |
| 1018 | + new CodeSource((urls.length > 0 ? urls[0] : null), | |
| 1019 | + (java.security.cert.Certificate[]) null), | |
| 1020 | + perms); | |
| 1021 | + return new AccessControlContext(new ProtectionDomain[] { pd }); | |
| 1022 | + } | |
| 1023 | + | |
| 1024 | + /** | |
| 1025 | + * Adds to the specified permission collection the permissions | |
| 1026 | + * necessary to load classes from a loader with the specified URL | |
| 1027 | + * path; if "forLoader" is true, also adds URL-specific | |
| 1028 | + * permissions necessary for the security context that such a | |
| 1029 | + * loader operates within, such as permissions necessary for | |
| 1030 | + * granting automatic permissions to classes defined by the | |
| 1031 | + * loader. A given permission is only added to the collection if | |
| 1032 | + * it is not already implied by the collection. | |
| 1033 | + */ | |
| 1034 | + private static void addPermissionsForURLs(URL[] urls, | |
| 1035 | + PermissionCollection perms, | |
| 1036 | + boolean forLoader) | |
| 1037 | + { | |
| 1038 | + for (int i = 0; i < urls.length; i++) { | |
| 1039 | + URL url = urls[i]; | |
| 1040 | + try { | |
| 1041 | + URLConnection urlConnection = url.openConnection(); | |
| 1042 | + Permission p = urlConnection.getPermission(); | |
| 1043 | + if (p != null) { | |
| 1044 | + if (p instanceof FilePermission) { | |
| 1045 | + /* | |
| 1046 | + * If the codebase is a file, the permission required | |
| 1047 | + * to actually read classes from the codebase URL is | |
| 1048 | + * the permission to read all files beneath the last | |
| 1049 | + * directory in the file path, either because JAR | |
| 1050 | + * files can refer to other JAR files in the same | |
| 1051 | + * directory, or because permission to read a | |
| 1052 | + * directory is not implied by permission to read the | |
| 1053 | + * contents of a directory, which all that might be | |
| 1054 | + * granted. | |
| 1055 | + */ | |
| 1056 | + String path = p.getName(); | |
| 1057 | + int endIndex = path.lastIndexOf(File.separatorChar); | |
| 1058 | + if (endIndex != -1) { | |
| 1059 | + path = path.substring(0, endIndex+1); | |
| 1060 | + if (path.endsWith(File.separator)) { | |
| 1061 | + path += "-"; | |
| 1062 | + } | |
| 1063 | + Permission p2 = new FilePermission(path, "read"); | |
| 1064 | + if (!perms.implies(p2)) { | |
| 1065 | + perms.add(p2); | |
| 1066 | + } | |
| 1067 | + perms.add(new FilePermission(path, "read")); | |
| 1068 | + } else { | |
| 1069 | + /* | |
| 1070 | + * No directory separator: use permission to | |
| 1071 | + * read the file. | |
| 1072 | + */ | |
| 1073 | + if (!perms.implies(p)) { | |
| 1074 | + perms.add(p); | |
| 1075 | + } | |
| 1076 | + } | |
| 1077 | + } else { | |
| 1078 | + if (!perms.implies(p)) { | |
| 1079 | + perms.add(p); | |
| 1080 | + } | |
| 1081 | + | |
| 1082 | + /* | |
| 1083 | + * If the purpose of these permissions is to grant | |
| 1084 | + * them to an instance of a URLClassLoader subclass, | |
| 1085 | + * we must add permission to connect to and accept | |
| 1086 | + * from the host of non-"file:" URLs, otherwise the | |
| 1087 | + * getPermissions() method of URLClassLoader will | |
| 1088 | + * throw a security exception. | |
| 1089 | + */ | |
| 1090 | + if (forLoader) { | |
| 1091 | + // get URL with meaningful host component | |
| 1092 | + URL hostURL = url; | |
| 1093 | + for (URLConnection conn = urlConnection; | |
| 1094 | + conn instanceof JarURLConnection;) | |
| 1095 | + { | |
| 1096 | + hostURL = | |
| 1097 | + ((JarURLConnection) conn).getJarFileURL(); | |
| 1098 | + conn = hostURL.openConnection(); | |
| 1099 | + } | |
| 1100 | + String host = hostURL.getHost(); | |
| 1101 | + if (host != null && | |
| 1102 | + p.implies(new SocketPermission(host, | |
| 1103 | + "resolve"))) | |
| 1104 | + { | |
| 1105 | + Permission p2 = | |
| 1106 | + new SocketPermission(host, | |
| 1107 | + "connect,accept"); | |
| 1108 | + if (!perms.implies(p2)) { | |
| 1109 | + perms.add(p2); | |
| 1110 | + } | |
| 1111 | + } | |
| 1112 | + } | |
| 1113 | + } | |
| 1114 | + } | |
| 1115 | + } catch (IOException e) { | |
| 1116 | + /* | |
| 1117 | + * This shouldn't happen, although it is declared to be | |
| 1118 | + * thrown by openConnection() and getPermission(). If it | |
| 1119 | + * does, don't bother granting or requiring any permissions | |
| 1120 | + * for this URL. | |
| 1121 | + */ | |
| 1122 | + } | |
| 1123 | + } | |
| 1124 | + } | |
| 1125 | + | |
| 1126 | + /** | |
| 1127 | + * Loader is the actual class of the RMI class loaders created | |
| 1128 | + * by the RMIClassLoader static methods. | |
| 1129 | + */ | |
| 1130 | + private static class Loader extends URLClassLoader { | |
| 1131 | + | |
| 1132 | + /** parent class loader, kept here as an optimization */ | |
| 1133 | + private ClassLoader parent; | |
| 1134 | + | |
| 1135 | + /** string form of loader's codebase URL path, also an optimization */ | |
| 1136 | + private String annotation; | |
| 1137 | + | |
| 1138 | + /** permissions required to access loader through public API */ | |
| 1139 | + private Permissions permissions; | |
| 1140 | + | |
| 1141 | + private Loader(URL[] urls, ClassLoader parent) { | |
| 1142 | + super(urls, parent); | |
| 1143 | + this.parent = parent; | |
| 1144 | + | |
| 1145 | + /* | |
| 1146 | + * Precompute the permissions required to access the loader. | |
| 1147 | + */ | |
| 1148 | + permissions = new Permissions(); | |
| 1149 | + addPermissionsForURLs(urls, permissions, false); | |
| 1150 | + | |
| 1151 | + /* | |
| 1152 | + * Caching the value of class annotation string here assumes | |
| 1153 | + * that the protected method addURL() is never called on this | |
| 1154 | + * class loader. | |
| 1155 | + */ | |
| 1156 | + annotation = urlsToPath(urls); | |
| 1157 | + } | |
| 1158 | + | |
| 1159 | + /** | |
| 1160 | + * Return the string to be annotated with all classes loaded from | |
| 1161 | + * this class loader. | |
| 1162 | + */ | |
| 1163 | + public String getClassAnnotation() { | |
| 1164 | + return annotation; | |
| 1165 | + } | |
| 1166 | + | |
| 1167 | + /** | |
| 1168 | + * Check that the current access control context has all of the | |
| 1169 | + * permissions necessary to load classes from this loader. | |
| 1170 | + */ | |
| 1171 | + private void checkPermissions() { | |
| 1172 | + SecurityManager sm = System.getSecurityManager(); | |
| 1173 | + if (sm != null) { // should never be null? | |
| 1174 | + Enumeration enum_ = permissions.elements(); | |
| 1175 | + while (enum_.hasMoreElements()) { | |
| 1176 | + sm.checkPermission((Permission) enum_.nextElement()); | |
| 1177 | + } | |
| 1178 | + } | |
| 1179 | + } | |
| 1180 | + | |
| 1181 | + /** | |
| 1182 | + * Return the permissions to be granted to code loaded from the | |
| 1183 | + * given code source. | |
| 1184 | + */ | |
| 1185 | + protected PermissionCollection getPermissions(CodeSource codesource) { | |
| 1186 | + PermissionCollection perms = super.getPermissions(codesource); | |
| 1187 | + /* | |
| 1188 | + * Grant the same permissions that URLClassLoader would grant. | |
| 1189 | + */ | |
| 1190 | + return perms; | |
| 1191 | + } | |
| 1192 | + | |
| 1193 | + /** | |
| 1194 | + * Return a string representation of this loader (useful for | |
| 1195 | + * debugging). | |
| 1196 | + */ | |
| 1197 | + public String toString() { | |
| 1198 | + return super.toString() + "[\"" + annotation + "\"]"; | |
| 1199 | + } | |
| 1200 | + } | |
| 1201 | +} | |