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 {
185
186 if ((mask & ALL) != mask)
187 throw new IllegalArgumentException("invalid actions mask");
188
189 if (mask == NONE)
190 throw new IllegalArgumentException("invalid actions mask");
191
192 if ((cpath = getName()) == null)
193 throw new NullPointerException("name can't be null");
194
195 this.mask = mask;
196
197 if (cpath.equals("<<ALL FILES>>")) {
198 directory = true;
199 recursive = true;
200 cpath = "";
201 return;
202 }
203
204 // store only the canonical cpath if possible
205 cpath = AccessController.doPrivileged(new PrivilegedAction<String>() {
206 public String run() {
207 try {
208 String path = cpath;
209 if (cpath.endsWith("*")) {
210 // call getCanonicalPath with a path with wildcard character
211 // replaced to avoid calling it with paths that are
212 // intended to match all entries in a directory
213 path = path.substring(0, path.length()-1) + "-";
214 path = new File(path).getCanonicalPath();
215 return path.substring(0, path.length()-1) + "*";
216 } else {
217 return new File(path).getCanonicalPath();
218 }
219 } catch (IOException ioe) {
220 return cpath;
221 }
222 }
223 });
224
225 int len = cpath.length();
226 char last = ((len > 0) ? cpath.charAt(len - 1) : 0);
227
228 if (last == RECURSIVE_CHAR &&
229 cpath.charAt(len - 2) == File.separatorChar) {
230 directory = true;
231 recursive = true;
232 cpath = cpath.substring(0, --len);
233 } else if (last == WILD_CHAR &&
234 cpath.charAt(len - 2) == File.separatorChar) {
235 directory = true;
236 //recursive = false;
237 cpath = cpath.substring(0, --len);
238 } else {
239 // overkill since they are initialized to false, but
240 // commented out here to remind us...
241 //directory = false;
242 //recursive = false;
243 }
244
245 // XXX: at this point the path should be absolute. die if it isn't?
246 }
247
248 /**
249 * Creates a new FilePermission object with the specified actions.
250 * <i>path</i> is the pathname of a file or directory, and <i>actions</i>
251 * contains a comma-separated list of the desired actions granted on the
252 * file or directory. Possible actions are
253 * "read", "write", "execute", "delete", and "readlink".
254 *
255 * <p>A pathname that ends in "/*" (where "/" is
256 * the file separator character, <code>File.separatorChar</code>)
257 * indicates all the files and directories contained in that directory.
258 * A pathname that ends with "/-" indicates (recursively) all files and
259 * subdirectories contained in that directory. The special pathname
260 * "<<ALL FILES>>" matches any file.
261 *
262 * <p>A pathname consisting of a single "*" indicates all the files
263 * in the current directory, while a pathname consisting of a single "-"
264 * indicates all the files in the current directory and
265 * (recursively) all files and subdirectories contained in the current
266 * directory.
267 *
268 * <p>A pathname containing an empty string represents an empty path.
269 *
270 * @param path the pathname of the file/directory.
271 * @param actions the action string.
272 *
273 * @throws IllegalArgumentException
274 * If actions is <code>null</code>, empty or contains an action
275 * other than the specified possible actions.
276 */
277
278 public FilePermission(String path, String actions)
279 {
280 super(path);
281 init(getMask(actions));
282 }
283
284 /**
285 * Creates a new FilePermission object using an action mask.
286 * More efficient than the FilePermission(String, String) constructor.
287 * Can be used from within
288 * code that needs to create a FilePermission object to pass into the
289 * <code>implies</code> method.
290 *
291 * @param path the pathname of the file/directory.
292 * @param mask the action mask to use.
293 */
294
295 // package private for use by the FilePermissionCollection add method
296 FilePermission(String path, int mask)
297 {
298 super(path);
299 init(mask);
300 }
301
302 /**
303 * Checks if this FilePermission object "implies" the specified permission.
304 * <P>
305 * More specifically, this method returns true if:<p>
306 * <ul>
307 * <li> <i>p</i> is an instanceof FilePermission,<p>
308 * <li> <i>p</i>'s actions are a proper subset of this
309 * object's actions, and <p>
310 * <li> <i>p</i>'s pathname is implied by this object's
311 * pathname. For example, "/tmp/*" implies "/tmp/foo", since
312 * "/tmp/*" encompasses all files in the "/tmp" directory,
313 * including the one named "foo".
314 * </ul>
315 *
316 * @param p the permission to check against.
317 *
318 * @return <code>true</code> if the specified permission is not
319 * <code>null</code> and is implied by this object,
320 * <code>false</code> otherwise.
321 */
322 public boolean implies(Permission p) {
323 if (!(p instanceof FilePermission))
324 return false;
325
326 FilePermission that = (FilePermission) p;
327
328 // we get the effective mask. i.e., the "and" of this and that.
329 // They must be equal to that.mask for implies to return true.
330
331 return ((this.mask & that.mask) == that.mask) && impliesIgnoreMask(that);
332 }
333
334 /**
335 * Checks if the Permission's actions are a proper subset of the
336 * this object's actions. Returns the effective mask iff the
337 * this FilePermission's path also implies that FilePermission's path.
338 *
339 * @param that the FilePermission to check against.
340 * @param exact return immediately if the masks are not equal
341 * @return the effective mask
342 */
343 boolean impliesIgnoreMask(FilePermission that) {
344 if (this.directory) {
345 if (this.recursive) {
346 // make sure that.path is longer then path so
347 // something like /foo/- does not imply /foo
348 if (that.directory) {
349 return (that.cpath.length() >= this.cpath.length()) &&
350 that.cpath.startsWith(this.cpath);
351 } else {
352 return ((that.cpath.length() > this.cpath.length()) &&
353 that.cpath.startsWith(this.cpath));
354 }
355 } else {
356 if (that.directory) {
357 // if the permission passed in is a directory
358 // specification, make sure that a non-recursive
359 // permission (i.e., this object) can't imply a recursive
360 // permission.
361 if (that.recursive)
362 return false;
363 else
364 return (this.cpath.equals(that.cpath));
365 } else {
366 int last = that.cpath.lastIndexOf(File.separatorChar);
367 if (last == -1)
368 return false;
369 else {
370 // this.cpath.equals(that.cpath.substring(0, last+1));
371 // Use regionMatches to avoid creating new string
372 return (this.cpath.length() == (last + 1)) &&
373 this.cpath.regionMatches(0, that.cpath, 0, last+1);
374 }
375 }
376 }
377 } else if (that.directory) {
378 // if this is NOT recursive/wildcarded,
379 // do not let it imply a recursive/wildcarded permission
380 return false;
381 } else {
382 return (this.cpath.equals(that.cpath));
383 }
384 }
385
386 /**
387 * Checks two FilePermission objects for equality. Checks that <i>obj</i> is
388 * a FilePermission, and has the same pathname and actions as this object.
389 * <P>
390 * @param obj the object we are testing for equality with this object.
391 * @return <code>true</code> if obj is a FilePermission, and has the same
392 * pathname and actions as this FilePermission object,
393 * <code>false</code> otherwise.
394 */
395 public boolean equals(Object obj) {
396 if (obj == this)
397 return true;
398
399 if (! (obj instanceof FilePermission))
400 return false;
401
402 FilePermission that = (FilePermission) obj;
403
404 return (this.mask == that.mask) &&
405 this.cpath.equals(that.cpath) &&
406 (this.directory == that.directory) &&
407 (this.recursive == that.recursive);
408 }
409
410 /**
411 * Returns the hash code value for this object.
412 *
413 * @return a hash code value for this object.
414 */
415
416 public int hashCode() {
417 return this.cpath.hashCode();
418 }
419
420 /**
421 * Converts an actions String to an actions mask.
422 *
423 * @param actions the action string.
424 * @return the actions mask.
425 */
426 private static int getMask(String actions) {
427
428 int mask = NONE;
429
430 // Null action valid?
431 if (actions == null) {
432 return mask;
433 }
434
435 // Use object identity comparison against known-interned strings for
436 // performance benefit (these values are used heavily within the JDK).
437 if (actions == SecurityConstants.FILE_READ_ACTION) {
438 return READ;
439 } else if (actions == SecurityConstants.FILE_WRITE_ACTION) {
440 return WRITE;
441 } else if (actions == SecurityConstants.FILE_EXECUTE_ACTION) {
442 return EXECUTE;
443 } else if (actions == SecurityConstants.FILE_DELETE_ACTION) {
444 return DELETE;
445 } else if (actions == SecurityConstants.FILE_READLINK_ACTION) {
446 return READLINK;
447 }
448
449 char[] a = actions.toCharArray();
450
451 int i = a.length - 1;
452 if (i < 0)
453 return mask;
454
455 while (i != -1) {
456 char c;
457
458 // skip whitespace
459 while ((i!=-1) && ((c = a[i]) == ' ' ||
460 c == '\r' ||
461 c == '\n' ||
462 c == '\f' ||
463 c == '\t'))
464 i--;
465
466 // check for the known strings
467 int matchlen;
468
469 if (i >= 3 && (a[i-3] == 'r' || a[i-3] == 'R') &&
470 (a[i-2] == 'e' || a[i-2] == 'E') &&
471 (a[i-1] == 'a' || a[i-1] == 'A') &&
472 (a[i] == 'd' || a[i] == 'D'))
473 {
474 matchlen = 4;
475 mask |= READ;
476
477 } else if (i >= 4 && (a[i-4] == 'w' || a[i-4] == 'W') &&
478 (a[i-3] == 'r' || a[i-3] == 'R') &&
479 (a[i-2] == 'i' || a[i-2] == 'I') &&
480 (a[i-1] == 't' || a[i-1] == 'T') &&
481 (a[i] == 'e' || a[i] == 'E'))
482 {
483 matchlen = 5;
484 mask |= WRITE;
485
486 } else if (i >= 6 && (a[i-6] == 'e' || a[i-6] == 'E') &&
487 (a[i-5] == 'x' || a[i-5] == 'X') &&
488 (a[i-4] == 'e' || a[i-4] == 'E') &&
489 (a[i-3] == 'c' || a[i-3] == 'C') &&
490 (a[i-2] == 'u' || a[i-2] == 'U') &&
491 (a[i-1] == 't' || a[i-1] == 'T') &&
492 (a[i] == 'e' || a[i] == 'E'))
493 {
494 matchlen = 7;
495 mask |= EXECUTE;
496
497 } else if (i >= 5 && (a[i-5] == 'd' || a[i-5] == 'D') &&
498 (a[i-4] == 'e' || a[i-4] == 'E') &&
499 (a[i-3] == 'l' || a[i-3] == 'L') &&
500 (a[i-2] == 'e' || a[i-2] == 'E') &&
501 (a[i-1] == 't' || a[i-1] == 'T') &&
502 (a[i] == 'e' || a[i] == 'E'))
503 {
504 matchlen = 6;
505 mask |= DELETE;
506
507 } else if (i >= 7 && (a[i-7] == 'r' || a[i-7] == 'R') &&
508 (a[i-6] == 'e' || a[i-6] == 'E') &&
509 (a[i-5] == 'a' || a[i-5] == 'A') &&
510 (a[i-4] == 'd' || a[i-4] == 'D') &&
511 (a[i-3] == 'l' || a[i-3] == 'L') &&
512 (a[i-2] == 'i' || a[i-2] == 'I') &&
513 (a[i-1] == 'n' || a[i-1] == 'N') &&
514 (a[i] == 'k' || a[i] == 'K'))
515 {
516 matchlen = 8;
517 mask |= READLINK;
518
519 } else {
520 // parse error
521 throw new IllegalArgumentException(
522 "invalid permission: " + actions);
523 }
524
525 // make sure we didn't just match the tail of a word
526 // like "ackbarfaccept". Also, skip to the comma.
527 boolean seencomma = false;
528 while (i >= matchlen && !seencomma) {
529 switch(a[i-matchlen]) {
530 case ',':
531 seencomma = true;
532 break;
533 case ' ': case '\r': case '\n':
534 case '\f': case '\t':
535 break;
536 default:
537 throw new IllegalArgumentException(
538 "invalid permission: " + actions);
539 }
540 i--;
541 }
542
543 // point i at the location of the comma minus one (or -1).
544 i -= matchlen;
545 }
546
547 return mask;
548 }
549
550 /**
551 * Return the current action mask. Used by the FilePermissionCollection.
552 *
553 * @return the actions mask.
554 */
555
556 int getMask() {
557 return mask;
558 }
559
560 /**
561 * Return the canonical string representation of the actions.
562 * Always returns present actions in the following order:
563 * read, write, execute, delete, readlink.
564 *
565 * @return the canonical string representation of the actions.
566 */
567 private static String getActions(int mask)
568 {
569 StringBuilder sb = new StringBuilder();
570 boolean comma = false;
571
572 if ((mask & READ) == READ) {
573 comma = true;
574 sb.append("read");
575 }
576
577 if ((mask & WRITE) == WRITE) {
578 if (comma) sb.append(',');
579 else comma = true;
580 sb.append("write");
581 }
582
583 if ((mask & EXECUTE) == EXECUTE) {
584 if (comma) sb.append(',');
585 else comma = true;
586 sb.append("execute");
587 }
588
589 if ((mask & DELETE) == DELETE) {
590 if (comma) sb.append(',');
591 else comma = true;
592 sb.append("delete");
593 }
594
595 if ((mask & READLINK) == READLINK) {
596 if (comma) sb.append(',');
597 else comma = true;
598 sb.append("readlink");
599 }
600
601 return sb.toString();
602 }
603
604 /**
605 * Returns the "canonical string representation" of the actions.
606 * That is, this method always returns present actions in the following order:
607 * read, write, execute, delete, readlink. For example, if this FilePermission
608 * object allows both write and read actions, a call to <code>getActions</code>
609 * will return the string "read,write".
610 *
611 * @return the canonical string representation of the actions.
612 */
613 public String getActions()
614 {
615 if (actions == null)
616 actions = getActions(this.mask);
617
618 return actions;
619 }
620
621
622 /**
623 * Returns a new PermissionCollection object for storing FilePermission
624 * objects.
625 * <p>
626 * FilePermission objects must be stored in a manner that allows them
627 * to be inserted into the collection in any order, but that also enables the
628 * PermissionCollection <code>implies</code>
629 * method to be implemented in an efficient (and consistent) manner.
630 *
631 * <p>For example, if you have two FilePermissions:
632 * <OL>
633 * <LI> <code>"/tmp/-", "read"</code>
634 * <LI> <code>"/tmp/scratch/foo", "write"</code>
635 * </OL>
636 *
637 * <p>and you are calling the <code>implies</code> method with the FilePermission:
638 *
639 * <pre>
640 * "/tmp/scratch/foo", "read,write",
641 * </pre>
642 *
643 * then the <code>implies</code> function must
644 * take into account both the "/tmp/-" and "/tmp/scratch/foo"
645 * permissions, so the effective permission is "read,write",
646 * and <code>implies</code> returns true. The "implies" semantics for
647 * FilePermissions are handled properly by the PermissionCollection object
648 * returned by this <code>newPermissionCollection</code> method.
649 *
650 * @return a new PermissionCollection object suitable for storing
651 * FilePermissions.
652 */
653
654 public PermissionCollection newPermissionCollection() {
655 return new FilePermissionCollection();
656 }
657
658 /**
659 * WriteObject is called to save the state of the FilePermission
660 * to a stream. The actions are serialized, and the superclass
661 * takes care of the name.
662 */
663 private void writeObject(ObjectOutputStream s)
664 throws IOException
665 {
666 // Write out the actions. The superclass takes care of the name
667 // call getActions to make sure actions field is initialized
668 if (actions == null)
669 getActions();
670 s.defaultWriteObject();
671 }
672
673 /**
674 * readObject is called to restore the state of the FilePermission from
675 * a stream.
676 */
677 private void readObject(ObjectInputStream s)
678 throws IOException, ClassNotFoundException
679 {
680 // Read in the actions, then restore everything else by calling init.
681 s.defaultReadObject();
682 init(getMask(actions));
683 }
684 }
685
686 /**
687 * A FilePermissionCollection stores a set of FilePermission permissions.
688 * FilePermission objects
689 * must be stored in a manner that allows them to be inserted in any
690 * order, but enable the implies function to evaluate the implies
691 * method.
692 * For example, if you have two FilePermissions:
693 * <OL>
694 * <LI> "/tmp/-", "read"
695 * <LI> "/tmp/scratch/foo", "write"
696 * </OL>
697 * And you are calling the implies function with the FilePermission:
698 * "/tmp/scratch/foo", "read,write", then the implies function must
699 * take into account both the /tmp/- and /tmp/scratch/foo
700 * permissions, so the effective permission is "read,write".
701 *
702 * @see java.security.Permission
703 * @see java.security.Permissions
704 * @see java.security.PermissionCollection
705 *
706 *
707 * @author Marianne Mueller
708 * @author Roland Schemers
709 *
710 * @serial include
711 *
712 */
713
714 final class FilePermissionCollection extends PermissionCollection
715 implements Serializable {
716
717 // Not serialized; see serialization section at end of class
718 private transient List<Permission> perms;
719
720 /**
721 * Create an empty FilePermissions object.
722 *
723 */
724
725 public FilePermissionCollection() {
726 perms = new ArrayList<>();
727 }
728
729 /**
730 * Adds a permission to the FilePermissions. The key for the hash is
731 * permission.path.
732 *
733 * @param permission the Permission object to add.
734 *
735 * @exception IllegalArgumentException - if the permission is not a
736 * FilePermission
737 *
738 * @exception SecurityException - if this FilePermissionCollection object
739 * has been marked readonly
740 */
741
742 public void add(Permission permission)
743 {
744 if (! (permission instanceof FilePermission))
745 throw new IllegalArgumentException("invalid permission: "+
746 permission);
747 if (isReadOnly())
748 throw new SecurityException(
749 "attempt to add a Permission to a readonly PermissionCollection");
750
751 synchronized (this) {
752 perms.add(permission);
753 }
754 }
755
756 /**
757 * Check and see if this set of permissions implies the permissions
758 * expressed in "permission".
759 *
760 * @param p the Permission object to compare
761 *
762 * @return true if "permission" is a proper subset of a permission in
763 * the set, false if not.
764 */
765
766 public boolean implies(Permission permission)
767 {
768 if (! (permission instanceof FilePermission))
769 return false;
770
771 FilePermission fp = (FilePermission) permission;
772
773 int desired = fp.getMask();
774 int effective = 0;
775 int needed = desired;
776
777 synchronized (this) {
778 int len = perms.size();
779 for (int i = 0; i < len; i++) {
780 FilePermission x = (FilePermission) perms.get(i);
781 if (((needed & x.getMask()) != 0) && x.impliesIgnoreMask(fp)) {
782 effective |= x.getMask();
783 if ((effective & desired) == desired)
784 return true;
785 needed = (desired ^ effective);
786 }
787 }
788 }
789 return false;
790 }
791
792 /**
793 * Returns an enumeration of all the FilePermission objects in the
794 * container.
795 *
796 * @return an enumeration of all the FilePermission objects.
797 */
798
799 public Enumeration<Permission> elements() {
800 // Convert Iterator into Enumeration
801 synchronized (this) {
802 return Collections.enumeration(perms);
803 }
804 }
805
806 private static final long serialVersionUID = 2202956749081564585L;
807
808 // Need to maintain serialization interoperability with earlier releases,
809 // which had the serializable field:
810 // private Vector permissions;
811
812 /**
813 * @serialField permissions java.util.Vector
814 * A list of FilePermission objects.
815 */
816 private static final ObjectStreamField[] serialPersistentFields = {
817 new ObjectStreamField("permissions", Vector.class),
818 };
819
820 /**
821 * @serialData "permissions" field (a Vector containing the FilePermissions).
822 */
823 /*
824 * Writes the contents of the perms field out as a Vector for
825 * serialization compatibility with earlier releases.
826 */
827 private void writeObject(ObjectOutputStream out) throws IOException {
828 // Don't call out.defaultWriteObject()
829
830 // Write out Vector
831 Vector<Permission> permissions = new Vector<>(perms.size());
832 synchronized (this) {
833 permissions.addAll(perms);
834 }
835
836 ObjectOutputStream.PutField pfields = out.putFields();
837 pfields.put("permissions", permissions);
838 out.writeFields();
839 }
840
841 /*
842 * Reads in a Vector of FilePermissions and saves them in the perms field.
843 */
844 private void readObject(ObjectInputStream in) throws IOException,
845 ClassNotFoundException {
846 // Don't call defaultReadObject()
847
848 // Read in serialized fields
849 ObjectInputStream.GetField gfields = in.readFields();
850
851 // Get the one we want
852 @SuppressWarnings("unchecked")
853 Vector<Permission> permissions = (Vector<Permission>)gfields.get("permissions", null);
854 perms = new ArrayList<>(permissions.size());
855 perms.addAll(permissions);
856 }
857 }