1 /*
2 * Copyright (c) 1997, 2012, 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 java.io;
27
28 import java.security.*;
29 import java.util.Enumeration;
30 import java.util.List;
31 import java.util.ArrayList;
32 import java.util.Vector;
33 import java.util.Collections;
34 import sun.security.util.SecurityConstants;
35
36 /**
37 * This class represents access to a file or directory. A FilePermission consists
38 * of a pathname and a set of actions valid for that pathname.
39 * <P>
40 * Pathname is the pathname of the file or directory granted the specified
41 * actions. A pathname that ends in "/*" (where "/" is
42 * the file separator character, <code>File.separatorChar</code>) indicates
43 * all the files and directories contained in that directory. A pathname
44 * that ends with "/-" indicates (recursively) all files
45 * and subdirectories contained in that directory. A pathname consisting of
46 * the special token "<<ALL FILES>>" matches <b>any</b> file.
47 * <P>
48 * Note: A pathname consisting of a single "*" indicates all the files
49 * in the current directory, while a pathname consisting of a single "-"
50 * indicates all the files in the current directory and
51 * (recursively) all files and subdirectories contained in the current
52 * directory.
53 * <P>
54 * The actions to be granted are passed to the constructor in a string containing
55 * a list of one or more comma-separated keywords. The possible keywords are
56 * "read", "write", "execute", "delete", and "readlink". Their meaning is
57 * defined as follows:
58 * <P>
59 * <DL>
60 * <DT> read <DD> read permission
61 * <DT> write <DD> write permission
62 * <DT> execute
63 * <DD> execute permission. Allows <code>Runtime.exec</code> to
64 * be called. Corresponds to <code>SecurityManager.checkExec</code>.
65 * <DT> delete
66 * <DD> delete permission. Allows <code>File.delete</code> to
67 * be called. Corresponds to <code>SecurityManager.checkDelete</code>.
68 * <DT> readlink
69 * <DD> read link permission. Allows the target of a
70 * <a href="../nio/file/package-summary.html#links">symbolic link</a>
71 * to be read by invoking the {@link java.nio.file.Files#readSymbolicLink
72 * readSymbolicLink } method.
73 * </DL>
74 * <P>
75 * The actions string is converted to lowercase before processing.
76 * <P>
77 * Be careful when granting FilePermissions. Think about the implications
78 * of granting read and especially write access to various files and
79 * directories. The "<<ALL FILES>>" permission with write action is
80 * especially dangerous. This grants permission to write to the entire
81 * file system. One thing this effectively allows is replacement of the
82 * system binary, including the JVM runtime environment.
83 *
84 * <p>Please note: Code can always read a file from the same
85 * directory it's in (or a subdirectory of that directory); it does not
86 * need explicit permission to do so.
87 *
88 * @see java.security.Permission
89 * @see java.security.Permissions
90 * @see java.security.PermissionCollection
91 *
92 *
93 * @author Marianne Mueller
94 * @author Roland Schemers
95 * @since 1.2
96 *
97 * @serial exclude
98 */
99
100 public final class FilePermission extends Permission implements Serializable {
101
102 /**
103 * Execute action.
104 */
105 private final static int EXECUTE = 0x1;
106 /**
107 * Write action.
108 */
109 private final static int WRITE = 0x2;
110 /**
111 * Read action.
112 */
113 private final static int READ = 0x4;
114 /**
115 * Delete action.
116 */
117 private final static int DELETE = 0x8;
118 /**
119 * Read link action.
120 */
121 private final static int READLINK = 0x10;
122
123 /**
124 * All actions (read,write,execute,delete,readlink)
125 */
126 private final static int ALL = READ|WRITE|EXECUTE|DELETE|READLINK;
127 /**
128 * No actions.
129 */
130 private final static int NONE = 0x0;
131
132 // the actions mask
133 private transient int mask;
134
135 // does path indicate a directory? (wildcard or recursive)
136 private transient boolean directory;
137
138 // is it a recursive directory specification?
139 private transient boolean recursive;
140
141 /**
142 * the actions string.
143 *
144 * @serial
145 */
146 private String actions; // Left null as long as possible, then
147 // created and re-used in the getAction function.
148
149 // canonicalized dir path. In the case of
150 // directories, it is the name "/blah/*" or "/blah/-" without
151 // the last character (the "*" or "-").
152
153 private transient String cpath;
154
155 // static Strings used by init(int mask)
156 private static final char RECURSIVE_CHAR = '-';
157 private static final char WILD_CHAR = '*';
158
159 /*
160 public String toString()
161 {
162 StringBuffer sb = new StringBuffer();
163 sb.append("***\n");
164 sb.append("cpath = "+cpath+"\n");
165 sb.append("mask = "+mask+"\n");
166 sb.append("actions = "+getActions()+"\n");
167 sb.append("directory = "+directory+"\n");
168 sb.append("recursive = "+recursive+"\n");
169 sb.append("***\n");
170 return sb.toString();
171 }
172 */
173
174 private static final long serialVersionUID = 7930732926638008763L;
175
176 /**
177 * initialize a FilePermission object. Common to all constructors.
178 * Also called during de-serialization.
179 *
180 * @param mask the actions mask to use.
181 *
182 */
183 private void init(int mask) {
184 if ((mask & ALL) != mask)
185 throw new IllegalArgumentException("invalid actions mask");
186
187 if (mask == NONE)
188 throw new IllegalArgumentException("invalid actions mask");
189
190 if ((cpath = getName()) == null)
191 throw new NullPointerException("name can't be null");
192
193 this.mask = mask;
194
195 if (cpath.equals("<<ALL FILES>>")) {
196 directory = true;
197 recursive = true;
198 cpath = "";
199 return;
200 }
201
202 // store only the canonical cpath if possible
203 cpath = AccessController.doPrivileged(new PrivilegedAction<String>() {
204 public String run() {
205 try {
206 String path = cpath;
207 if (cpath.endsWith("*")) {
208 // call getCanonicalPath with a path with wildcard character
209 // replaced to avoid calling it with paths that are
210 // intended to match all entries in a directory
211 path = path.substring(0, path.length()-1) + "-";
212 path = new File(path).getCanonicalPath();
213 return path.substring(0, path.length()-1) + "*";
214 } else {
215 return new File(path).getCanonicalPath();
216 }
217 } catch (IOException ioe) {
218 return cpath;
219 }
220 }
221 });
222
223 int len = cpath.length();
224 char last = ((len > 0) ? cpath.charAt(len - 1) : 0);
225
226 if (last == RECURSIVE_CHAR &&
227 cpath.charAt(len - 2) == File.separatorChar) {
228 directory = true;
229 recursive = true;
230 cpath = cpath.substring(0, --len);
231 } else if (last == WILD_CHAR &&
232 cpath.charAt(len - 2) == File.separatorChar) {
233 directory = true;
234 //recursive = false;
235 cpath = cpath.substring(0, --len);
236 } else {
237 // overkill since they are initialized to false, but
238 // commented out here to remind us...
239 //directory = false;
240 //recursive = false;
241 }
242
243 // XXX: at this point the path should be absolute. die if it isn't?
244 }
245
246 /**
247 * Creates a new FilePermission object with the specified actions.
248 * <i>path</i> is the pathname of a file or directory, and <i>actions</i>
249 * contains a comma-separated list of the desired actions granted on the
250 * file or directory. Possible actions are
251 * "read", "write", "execute", "delete", and "readlink".
252 *
253 * <p>A pathname that ends in "/*" (where "/" is
254 * the file separator character, <code>File.separatorChar</code>)
255 * indicates all the files and directories contained in that directory.
256 * A pathname that ends with "/-" indicates (recursively) all files and
257 * subdirectories contained in that directory. The special pathname
258 * "<<ALL FILES>>" matches any file.
259 *
260 * <p>A pathname consisting of a single "*" indicates all the files
261 * in the current directory, while a pathname consisting of a single "-"
262 * indicates all the files in the current directory and
263 * (recursively) all files and subdirectories contained in the current
264 * directory.
265 *
266 * <p>A pathname containing an empty string represents an empty path.
267 *
268 * @param path the pathname of the file/directory.
269 * @param actions the action string.
270 *
271 * @throws IllegalArgumentException
272 * If actions is <code>null</code>, empty or contains an action
273 * other than the specified possible actions.
274 */
275 public FilePermission(String path, String actions) {
276 super(path);
277 init(getMask(actions));
278 }
279
280 /**
281 * Creates a new FilePermission object using an action mask.
282 * More efficient than the FilePermission(String, String) constructor.
283 * Can be used from within
284 * code that needs to create a FilePermission object to pass into the
285 * <code>implies</code> method.
286 *
287 * @param path the pathname of the file/directory.
288 * @param mask the action mask to use.
289 */
290
291 // package private for use by the FilePermissionCollection add method
292 FilePermission(String path, int mask) {
293 super(path);
294 init(mask);
295 }
296
297 /**
298 * Checks if this FilePermission object "implies" the specified permission.
299 * <P>
300 * More specifically, this method returns true if:<p>
301 * <ul>
302 * <li> <i>p</i> is an instanceof FilePermission,<p>
303 * <li> <i>p</i>'s actions are a proper subset of this
304 * object's actions, and <p>
305 * <li> <i>p</i>'s pathname is implied by this object's
306 * pathname. For example, "/tmp/*" implies "/tmp/foo", since
307 * "/tmp/*" encompasses all files in the "/tmp" directory,
308 * including the one named "foo".
309 * </ul>
310 *
311 * @param p the permission to check against.
312 *
313 * @return <code>true</code> if the specified permission is not
314 * <code>null</code> and is implied by this object,
315 * <code>false</code> otherwise.
316 */
317 public boolean implies(Permission p) {
318 if (!(p instanceof FilePermission))
319 return false;
320
321 FilePermission that = (FilePermission) p;
322
323 // we get the effective mask. i.e., the "and" of this and that.
324 // They must be equal to that.mask for implies to return true.
325
326 return ((this.mask & that.mask) == that.mask) && impliesIgnoreMask(that);
327 }
328
329 /**
330 * Checks if the Permission's actions are a proper subset of the
331 * this object's actions. Returns the effective mask iff the
332 * this FilePermission's path also implies that FilePermission's path.
333 *
334 * @param that the FilePermission to check against.
335 * @return the effective mask
336 */
337 boolean impliesIgnoreMask(FilePermission that) {
338 if (this.directory) {
339 if (this.recursive) {
340 // make sure that.path is longer then path so
341 // something like /foo/- does not imply /foo
342 if (that.directory) {
343 return (that.cpath.length() >= this.cpath.length()) &&
344 that.cpath.startsWith(this.cpath);
345 } else {
346 return ((that.cpath.length() > this.cpath.length()) &&
347 that.cpath.startsWith(this.cpath));
348 }
349 } else {
350 if (that.directory) {
351 // if the permission passed in is a directory
352 // specification, make sure that a non-recursive
353 // permission (i.e., this object) can't imply a recursive
354 // permission.
355 if (that.recursive)
356 return false;
357 else
358 return (this.cpath.equals(that.cpath));
359 } else {
360 int last = that.cpath.lastIndexOf(File.separatorChar);
361 if (last == -1)
362 return false;
363 else {
364 // this.cpath.equals(that.cpath.substring(0, last+1));
365 // Use regionMatches to avoid creating new string
366 return (this.cpath.length() == (last + 1)) &&
367 this.cpath.regionMatches(0, that.cpath, 0, last+1);
368 }
369 }
370 }
371 } else if (that.directory) {
372 // if this is NOT recursive/wildcarded,
373 // do not let it imply a recursive/wildcarded permission
374 return false;
375 } else {
376 return (this.cpath.equals(that.cpath));
377 }
378 }
379
380 /**
381 * Checks two FilePermission objects for equality. Checks that <i>obj</i> is
382 * a FilePermission, and has the same pathname and actions as this object.
383 * <P>
384 * @param obj the object we are testing for equality with this object.
385 * @return <code>true</code> if obj is a FilePermission, and has the same
386 * pathname and actions as this FilePermission object,
387 * <code>false</code> otherwise.
388 */
389 public boolean equals(Object obj) {
390 if (obj == this)
391 return true;
392
393 if (! (obj instanceof FilePermission))
394 return false;
395
396 FilePermission that = (FilePermission) obj;
397
398 return (this.mask == that.mask) &&
399 this.cpath.equals(that.cpath) &&
400 (this.directory == that.directory) &&
401 (this.recursive == that.recursive);
402 }
403
404 /**
405 * Returns the hash code value for this object.
406 *
407 * @return a hash code value for this object.
408 */
409 public int hashCode() {
410 return this.cpath.hashCode();
411 }
412
413 /**
414 * Converts an actions String to an actions mask.
415 *
416 * @param actions the action string.
417 * @return the actions mask.
418 */
419 private static int getMask(String actions) {
420 int mask = NONE;
421
422 // Null action valid?
423 if (actions == null) {
424 return mask;
425 }
426
427 // Use object identity comparison against known-interned strings for
428 // performance benefit (these values are used heavily within the JDK).
429 if (actions == SecurityConstants.FILE_READ_ACTION) {
430 return READ;
431 } else if (actions == SecurityConstants.FILE_WRITE_ACTION) {
432 return WRITE;
433 } else if (actions == SecurityConstants.FILE_EXECUTE_ACTION) {
434 return EXECUTE;
435 } else if (actions == SecurityConstants.FILE_DELETE_ACTION) {
436 return DELETE;
437 } else if (actions == SecurityConstants.FILE_READLINK_ACTION) {
438 return READLINK;
439 }
440
441 char[] a = actions.toCharArray();
442
443 int i = a.length - 1;
444 if (i < 0)
445 return mask;
446
447 while (i != -1) {
448 char c;
449
450 // skip whitespace
451 while ((i!=-1) && ((c = a[i]) == ' ' ||
452 c == '\r' ||
453 c == '\n' ||
454 c == '\f' ||
455 c == '\t'))
456 i--;
457
458 // check for the known strings
459 int matchlen;
460
461 if (i >= 3 && (a[i-3] == 'r' || a[i-3] == 'R') &&
462 (a[i-2] == 'e' || a[i-2] == 'E') &&
463 (a[i-1] == 'a' || a[i-1] == 'A') &&
464 (a[i] == 'd' || a[i] == 'D'))
465 {
466 matchlen = 4;
467 mask |= READ;
468
469 } else if (i >= 4 && (a[i-4] == 'w' || a[i-4] == 'W') &&
470 (a[i-3] == 'r' || a[i-3] == 'R') &&
471 (a[i-2] == 'i' || a[i-2] == 'I') &&
472 (a[i-1] == 't' || a[i-1] == 'T') &&
473 (a[i] == 'e' || a[i] == 'E'))
474 {
475 matchlen = 5;
476 mask |= WRITE;
477
478 } else if (i >= 6 && (a[i-6] == 'e' || a[i-6] == 'E') &&
479 (a[i-5] == 'x' || a[i-5] == 'X') &&
480 (a[i-4] == 'e' || a[i-4] == 'E') &&
481 (a[i-3] == 'c' || a[i-3] == 'C') &&
482 (a[i-2] == 'u' || a[i-2] == 'U') &&
483 (a[i-1] == 't' || a[i-1] == 'T') &&
484 (a[i] == 'e' || a[i] == 'E'))
485 {
486 matchlen = 7;
487 mask |= EXECUTE;
488
489 } else if (i >= 5 && (a[i-5] == 'd' || a[i-5] == 'D') &&
490 (a[i-4] == 'e' || a[i-4] == 'E') &&
491 (a[i-3] == 'l' || a[i-3] == 'L') &&
492 (a[i-2] == 'e' || a[i-2] == 'E') &&
493 (a[i-1] == 't' || a[i-1] == 'T') &&
494 (a[i] == 'e' || a[i] == 'E'))
495 {
496 matchlen = 6;
497 mask |= DELETE;
498
499 } else if (i >= 7 && (a[i-7] == 'r' || a[i-7] == 'R') &&
500 (a[i-6] == 'e' || a[i-6] == 'E') &&
501 (a[i-5] == 'a' || a[i-5] == 'A') &&
502 (a[i-4] == 'd' || a[i-4] == 'D') &&
503 (a[i-3] == 'l' || a[i-3] == 'L') &&
504 (a[i-2] == 'i' || a[i-2] == 'I') &&
505 (a[i-1] == 'n' || a[i-1] == 'N') &&
506 (a[i] == 'k' || a[i] == 'K'))
507 {
508 matchlen = 8;
509 mask |= READLINK;
510
511 } else {
512 // parse error
513 throw new IllegalArgumentException(
514 "invalid permission: " + actions);
515 }
516
517 // make sure we didn't just match the tail of a word
518 // like "ackbarfaccept". Also, skip to the comma.
519 boolean seencomma = false;
520 while (i >= matchlen && !seencomma) {
521 switch(a[i-matchlen]) {
522 case ',':
523 seencomma = true;
524 break;
525 case ' ': case '\r': case '\n':
526 case '\f': case '\t':
527 break;
528 default:
529 throw new IllegalArgumentException(
530 "invalid permission: " + actions);
531 }
532 i--;
533 }
534
535 // point i at the location of the comma minus one (or -1).
536 i -= matchlen;
537 }
538
539 return mask;
540 }
541
542 /**
543 * Return the current action mask. Used by the FilePermissionCollection.
544 *
545 * @return the actions mask.
546 */
547 int getMask() {
548 return mask;
549 }
550
551 /**
552 * Return the canonical string representation of the actions.
553 * Always returns present actions in the following order:
554 * read, write, execute, delete, readlink.
555 *
556 * @return the canonical string representation of the actions.
557 */
558 private static String getActions(int mask) {
559 StringBuilder sb = new StringBuilder();
560 boolean comma = false;
561
562 if ((mask & READ) == READ) {
563 comma = true;
564 sb.append("read");
565 }
566
567 if ((mask & WRITE) == WRITE) {
568 if (comma) sb.append(',');
569 else comma = true;
570 sb.append("write");
571 }
572
573 if ((mask & EXECUTE) == EXECUTE) {
574 if (comma) sb.append(',');
575 else comma = true;
576 sb.append("execute");
577 }
578
579 if ((mask & DELETE) == DELETE) {
580 if (comma) sb.append(',');
581 else comma = true;
582 sb.append("delete");
583 }
584
585 if ((mask & READLINK) == READLINK) {
586 if (comma) sb.append(',');
587 else comma = true;
588 sb.append("readlink");
589 }
590
591 return sb.toString();
592 }
593
594 /**
595 * Returns the "canonical string representation" of the actions.
596 * That is, this method always returns present actions in the following order:
597 * read, write, execute, delete, readlink. For example, if this FilePermission
598 * object allows both write and read actions, a call to <code>getActions</code>
599 * will return the string "read,write".
600 *
601 * @return the canonical string representation of the actions.
602 */
603 public String getActions() {
604 if (actions == null)
605 actions = getActions(this.mask);
606
607 return actions;
608 }
609
610 /**
611 * Returns a new PermissionCollection object for storing FilePermission
612 * objects.
613 * <p>
614 * FilePermission objects must be stored in a manner that allows them
615 * to be inserted into the collection in any order, but that also enables the
616 * PermissionCollection <code>implies</code>
617 * method to be implemented in an efficient (and consistent) manner.
618 *
619 * <p>For example, if you have two FilePermissions:
620 * <OL>
621 * <LI> <code>"/tmp/-", "read"</code>
622 * <LI> <code>"/tmp/scratch/foo", "write"</code>
623 * </OL>
624 *
625 * <p>and you are calling the <code>implies</code> method with the FilePermission:
626 *
627 * <pre>
628 * "/tmp/scratch/foo", "read,write",
629 * </pre>
630 *
631 * then the <code>implies</code> function must
632 * take into account both the "/tmp/-" and "/tmp/scratch/foo"
633 * permissions, so the effective permission is "read,write",
634 * and <code>implies</code> returns true. The "implies" semantics for
635 * FilePermissions are handled properly by the PermissionCollection object
636 * returned by this <code>newPermissionCollection</code> method.
637 *
638 * @return a new PermissionCollection object suitable for storing
639 * FilePermissions.
640 */
641 public PermissionCollection newPermissionCollection() {
642 return new FilePermissionCollection();
643 }
644
645 /**
646 * WriteObject is called to save the state of the FilePermission
647 * to a stream. The actions are serialized, and the superclass
648 * takes care of the name.
649 */
650 private void writeObject(ObjectOutputStream s)
651 throws IOException
652 {
653 // Write out the actions. The superclass takes care of the name
654 // call getActions to make sure actions field is initialized
655 if (actions == null)
656 getActions();
657 s.defaultWriteObject();
658 }
659
660 /**
661 * readObject is called to restore the state of the FilePermission from
662 * a stream.
663 */
664 private void readObject(ObjectInputStream s)
665 throws IOException, ClassNotFoundException
666 {
667 // Read in the actions, then restore everything else by calling init.
668 s.defaultReadObject();
669 init(getMask(actions));
670 }
671 }
672
673 /**
674 * A FilePermissionCollection stores a set of FilePermission permissions.
675 * FilePermission objects
676 * must be stored in a manner that allows them to be inserted in any
677 * order, but enable the implies function to evaluate the implies
678 * method.
679 * For example, if you have two FilePermissions:
680 * <OL>
681 * <LI> "/tmp/-", "read"
682 * <LI> "/tmp/scratch/foo", "write"
683 * </OL>
684 * And you are calling the implies function with the FilePermission:
685 * "/tmp/scratch/foo", "read,write", then the implies function must
686 * take into account both the /tmp/- and /tmp/scratch/foo
687 * permissions, so the effective permission is "read,write".
688 *
689 * @see java.security.Permission
690 * @see java.security.Permissions
691 * @see java.security.PermissionCollection
692 *
693 *
694 * @author Marianne Mueller
695 * @author Roland Schemers
696 *
697 * @serial include
698 *
699 */
700
701 final class FilePermissionCollection extends PermissionCollection
702 implements Serializable
703 {
704 // Not serialized; see serialization section at end of class
705 private transient List<Permission> perms;
706
707 /**
708 * Create an empty FilePermissionCollection object.
709 */
710 public FilePermissionCollection() {
711 perms = new ArrayList<>();
712 }
713
714 /**
715 * Adds a permission to the FilePermissionCollection. The key for the hash is
716 * permission.path.
717 *
718 * @param permission the Permission object to add.
719 *
720 * @exception IllegalArgumentException - if the permission is not a
721 * FilePermission
722 *
723 * @exception SecurityException - if this FilePermissionCollection object
724 * has been marked readonly
725 */
726 public void add(Permission permission) {
727 if (! (permission instanceof FilePermission))
728 throw new IllegalArgumentException("invalid permission: "+
729 permission);
730 if (isReadOnly())
731 throw new SecurityException(
732 "attempt to add a Permission to a readonly PermissionCollection");
733
734 synchronized (this) {
735 perms.add(permission);
736 }
737 }
738
739 /**
740 * Check and see if this set of permissions implies the permissions
741 * expressed in "permission".
742 *
743 * @param permission the Permission object to compare
744 *
745 * @return true if "permission" is a proper subset of a permission in
746 * the set, false if not.
747 */
748 public boolean implies(Permission permission) {
749 if (! (permission instanceof FilePermission))
750 return false;
751
752 FilePermission fp = (FilePermission) permission;
753
754 int desired = fp.getMask();
755 int effective = 0;
756 int needed = desired;
757
758 synchronized (this) {
759 int len = perms.size();
760 for (int i = 0; i < len; i++) {
761 FilePermission x = (FilePermission) perms.get(i);
762 if (((needed & x.getMask()) != 0) && x.impliesIgnoreMask(fp)) {
763 effective |= x.getMask();
764 if ((effective & desired) == desired)
765 return true;
766 needed = (desired ^ effective);
767 }
768 }
769 }
770 return false;
771 }
772
773 /**
774 * Returns an enumeration of all the FilePermission objects in the
775 * container.
776 *
777 * @return an enumeration of all the FilePermission objects.
778 */
779 public Enumeration<Permission> elements() {
780 // Convert Iterator into Enumeration
781 synchronized (this) {
782 return Collections.enumeration(perms);
783 }
784 }
785
786 private static final long serialVersionUID = 2202956749081564585L;
787
788 // Need to maintain serialization interoperability with earlier releases,
789 // which had the serializable field:
790 // private Vector permissions;
791
792 /**
793 * @serialField permissions java.util.Vector
794 * A list of FilePermission objects.
795 */
796 private static final ObjectStreamField[] serialPersistentFields = {
797 new ObjectStreamField("permissions", Vector.class),
798 };
799
800 /**
801 * @serialData "permissions" field (a Vector containing the FilePermissions).
802 */
803 /*
804 * Writes the contents of the perms field out as a Vector for
805 * serialization compatibility with earlier releases.
806 */
807 private void writeObject(ObjectOutputStream out) throws IOException {
808 // Don't call out.defaultWriteObject()
809
810 // Write out Vector
811 Vector<Permission> permissions = new Vector<>(perms.size());
812 synchronized (this) {
813 permissions.addAll(perms);
814 }
815
816 ObjectOutputStream.PutField pfields = out.putFields();
817 pfields.put("permissions", permissions);
818 out.writeFields();
819 }
820
821 /*
822 * Reads in a Vector of FilePermissions and saves them in the perms field.
823 */
824 private void readObject(ObjectInputStream in)
825 throws IOException, ClassNotFoundException
826 {
827 // Don't call defaultReadObject()
828
829 // Read in serialized fields
830 ObjectInputStream.GetField gfields = in.readFields();
831
832 // Get the one we want
833 @SuppressWarnings("unchecked")
834 Vector<Permission> permissions = (Vector<Permission>)gfields.get("permissions", null);
835 perms = new ArrayList<>(permissions.size());
836 perms.addAll(permissions);
837 }
838 }