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 @SuppressWarnings("fallthrough")
427 private static int getMask(String actions) {
428
429 int mask = NONE;
430
431 // Null action valid?
432 if (actions == null) {
433 return mask;
434 }
435 // Check against use of constants (used heavily within the JDK)
436 if (actions == SecurityConstants.FILE_READ_ACTION) {
437 return READ;
438 } else if (actions == SecurityConstants.FILE_WRITE_ACTION) {
439 return WRITE;
440 } else if (actions == SecurityConstants.FILE_EXECUTE_ACTION) {
441 return EXECUTE;
442 } else if (actions == SecurityConstants.FILE_DELETE_ACTION) {
443 return DELETE;
444 } else if (actions == SecurityConstants.FILE_READLINK_ACTION) {
445 return READLINK;
446 }
447
448 char[] a = actions.toCharArray();
449
450 int i = a.length - 1;
451 if (i < 0)
452 return mask;
453
454 while (i != -1) {
455 char c;
456
457 // skip whitespace
458 while ((i!=-1) && ((c = a[i]) == ' ' ||
459 c == '\r' ||
460 c == '\n' ||
461 c == '\f' ||
462 c == '\t'))
463 i--;
464
465 // check for the known strings
466 int matchlen;
467
468 if (i >= 3 && (a[i-3] == 'r' || a[i-3] == 'R') &&
469 (a[i-2] == 'e' || a[i-2] == 'E') &&
470 (a[i-1] == 'a' || a[i-1] == 'A') &&
471 (a[i] == 'd' || a[i] == 'D'))
472 {
473 matchlen = 4;
474 mask |= READ;
475
476 } else if (i >= 4 && (a[i-4] == 'w' || a[i-4] == 'W') &&
477 (a[i-3] == 'r' || a[i-3] == 'R') &&
478 (a[i-2] == 'i' || a[i-2] == 'I') &&
479 (a[i-1] == 't' || a[i-1] == 'T') &&
480 (a[i] == 'e' || a[i] == 'E'))
481 {
482 matchlen = 5;
483 mask |= WRITE;
484
485 } else if (i >= 6 && (a[i-6] == 'e' || a[i-6] == 'E') &&
486 (a[i-5] == 'x' || a[i-5] == 'X') &&
487 (a[i-4] == 'e' || a[i-4] == 'E') &&
488 (a[i-3] == 'c' || a[i-3] == 'C') &&
489 (a[i-2] == 'u' || a[i-2] == 'U') &&
490 (a[i-1] == 't' || a[i-1] == 'T') &&
491 (a[i] == 'e' || a[i] == 'E'))
492 {
493 matchlen = 7;
494 mask |= EXECUTE;
495
496 } else if (i >= 5 && (a[i-5] == 'd' || a[i-5] == 'D') &&
497 (a[i-4] == 'e' || a[i-4] == 'E') &&
498 (a[i-3] == 'l' || a[i-3] == 'L') &&
499 (a[i-2] == 'e' || a[i-2] == 'E') &&
500 (a[i-1] == 't' || a[i-1] == 'T') &&
501 (a[i] == 'e' || a[i] == 'E'))
502 {
503 matchlen = 6;
504 mask |= DELETE;
505
506 } else if (i >= 7 && (a[i-7] == 'r' || a[i-7] == 'R') &&
507 (a[i-6] == 'e' || a[i-6] == 'E') &&
508 (a[i-5] == 'a' || a[i-5] == 'A') &&
509 (a[i-4] == 'd' || a[i-4] == 'D') &&
510 (a[i-3] == 'l' || a[i-3] == 'L') &&
511 (a[i-2] == 'i' || a[i-2] == 'I') &&
512 (a[i-1] == 'n' || a[i-1] == 'N') &&
513 (a[i] == 'k' || a[i] == 'K'))
514 {
515 matchlen = 8;
516 mask |= READLINK;
517
518 } else {
519 // parse error
520 throw new IllegalArgumentException(
521 "invalid permission: " + actions);
522 }
523
524 // make sure we didn't just match the tail of a word
525 // like "ackbarfaccept". Also, skip to the comma.
526 boolean seencomma = false;
527 while (i >= matchlen && !seencomma) {
528 switch(a[i-matchlen]) {
529 case ',':
530 seencomma = true;
531 /*FALLTHROUGH*/
532 case ' ': case '\r': case '\n':
533 case '\f': case '\t':
534 break;
535 default:
536 throw new IllegalArgumentException(
537 "invalid permission: " + actions);
538 }
539 i--;
540 }
541
542 // point i at the location of the comma minus one (or -1).
543 i -= matchlen;
544 }
545
546 return mask;
547 }
548
549 /**
550 * Return the current action mask. Used by the FilePermissionCollection.
551 *
552 * @return the actions mask.
553 */
554
555 int getMask() {
556 return mask;
557 }
558
559 /**
560 * Return the canonical string representation of the actions.
561 * Always returns present actions in the following order:
562 * read, write, execute, delete, readlink.
563 *
564 * @return the canonical string representation of the actions.
565 */
566 private static String getActions(int mask)
567 {
568 StringBuilder sb = new StringBuilder();
569 boolean comma = false;
570
571 if ((mask & READ) == READ) {
572 comma = true;
573 sb.append("read");
574 }
575
576 if ((mask & WRITE) == WRITE) {
577 if (comma) sb.append(',');
578 else comma = true;
579 sb.append("write");
580 }
581
582 if ((mask & EXECUTE) == EXECUTE) {
583 if (comma) sb.append(',');
584 else comma = true;
585 sb.append("execute");
586 }
587
588 if ((mask & DELETE) == DELETE) {
589 if (comma) sb.append(',');
590 else comma = true;
591 sb.append("delete");
592 }
593
594 if ((mask & READLINK) == READLINK) {
595 if (comma) sb.append(',');
596 else comma = true;
597 sb.append("readlink");
598 }
599
600 return sb.toString();
601 }
602
603 /**
604 * Returns the "canonical string representation" of the actions.
605 * That is, this method always returns present actions in the following order:
606 * read, write, execute, delete, readlink. For example, if this FilePermission
607 * object allows both write and read actions, a call to <code>getActions</code>
608 * will return the string "read,write".
609 *
610 * @return the canonical string representation of the actions.
611 */
612 public String getActions()
613 {
614 if (actions == null)
615 actions = getActions(this.mask);
616
617 return actions;
618 }
619
620
621 /**
622 * Returns a new PermissionCollection object for storing FilePermission
623 * objects.
624 * <p>
625 * FilePermission objects must be stored in a manner that allows them
626 * to be inserted into the collection in any order, but that also enables the
627 * PermissionCollection <code>implies</code>
628 * method to be implemented in an efficient (and consistent) manner.
629 *
630 * <p>For example, if you have two FilePermissions:
631 * <OL>
632 * <LI> <code>"/tmp/-", "read"</code>
633 * <LI> <code>"/tmp/scratch/foo", "write"</code>
634 * </OL>
635 *
636 * <p>and you are calling the <code>implies</code> method with the FilePermission:
637 *
638 * <pre>
639 * "/tmp/scratch/foo", "read,write",
640 * </pre>
641 *
642 * then the <code>implies</code> function must
643 * take into account both the "/tmp/-" and "/tmp/scratch/foo"
644 * permissions, so the effective permission is "read,write",
645 * and <code>implies</code> returns true. The "implies" semantics for
646 * FilePermissions are handled properly by the PermissionCollection object
647 * returned by this <code>newPermissionCollection</code> method.
648 *
649 * @return a new PermissionCollection object suitable for storing
650 * FilePermissions.
651 */
652
653 public PermissionCollection newPermissionCollection() {
654 return new FilePermissionCollection();
655 }
656
657 /**
658 * WriteObject is called to save the state of the FilePermission
659 * to a stream. The actions are serialized, and the superclass
660 * takes care of the name.
661 */
662 private void writeObject(ObjectOutputStream s)
663 throws IOException
664 {
665 // Write out the actions. The superclass takes care of the name
666 // call getActions to make sure actions field is initialized
667 if (actions == null)
668 getActions();
669 s.defaultWriteObject();
670 }
671
672 /**
673 * readObject is called to restore the state of the FilePermission from
674 * a stream.
675 */
676 private void readObject(ObjectInputStream s)
677 throws IOException, ClassNotFoundException
678 {
679 // Read in the actions, then restore everything else by calling init.
680 s.defaultReadObject();
681 init(getMask(actions));
682 }
683 }
684
685 /**
686 * A FilePermissionCollection stores a set of FilePermission permissions.
687 * FilePermission objects
688 * must be stored in a manner that allows them to be inserted in any
689 * order, but enable the implies function to evaluate the implies
690 * method.
691 * For example, if you have two FilePermissions:
692 * <OL>
693 * <LI> "/tmp/-", "read"
694 * <LI> "/tmp/scratch/foo", "write"
695 * </OL>
696 * And you are calling the implies function with the FilePermission:
697 * "/tmp/scratch/foo", "read,write", then the implies function must
698 * take into account both the /tmp/- and /tmp/scratch/foo
699 * permissions, so the effective permission is "read,write".
700 *
701 * @see java.security.Permission
702 * @see java.security.Permissions
703 * @see java.security.PermissionCollection
704 *
705 *
706 * @author Marianne Mueller
707 * @author Roland Schemers
708 *
709 * @serial include
710 *
711 */
712
713 final class FilePermissionCollection extends PermissionCollection
714 implements Serializable {
715
716 // Not serialized; see serialization section at end of class
717 private transient List<Permission> perms;
718
719 /**
720 * Create an empty FilePermissions object.
721 *
722 */
723
724 public FilePermissionCollection() {
725 perms = new ArrayList<>();
726 }
727
728 /**
729 * Adds a permission to the FilePermissions. The key for the hash is
730 * permission.path.
731 *
732 * @param permission the Permission object to add.
733 *
734 * @exception IllegalArgumentException - if the permission is not a
735 * FilePermission
736 *
737 * @exception SecurityException - if this FilePermissionCollection object
738 * has been marked readonly
739 */
740
741 public void add(Permission permission)
742 {
743 if (! (permission instanceof FilePermission))
744 throw new IllegalArgumentException("invalid permission: "+
745 permission);
746 if (isReadOnly())
747 throw new SecurityException(
748 "attempt to add a Permission to a readonly PermissionCollection");
749
750 synchronized (this) {
751 perms.add(permission);
752 }
753 }
754
755 /**
756 * Check and see if this set of permissions implies the permissions
757 * expressed in "permission".
758 *
759 * @param p the Permission object to compare
760 *
761 * @return true if "permission" is a proper subset of a permission in
762 * the set, false if not.
763 */
764
765 public boolean implies(Permission permission)
766 {
767 if (! (permission instanceof FilePermission))
768 return false;
769
770 FilePermission fp = (FilePermission) permission;
771
772 int desired = fp.getMask();
773 int effective = 0;
774 int needed = desired;
775
776 synchronized (this) {
777 int len = perms.size();
778 for (int i = 0; i < len; i++) {
779 FilePermission x = (FilePermission) perms.get(i);
780 if (((needed & x.getMask()) != 0) && x.impliesIgnoreMask(fp)) {
781 effective |= x.getMask();
782 if ((effective & desired) == desired)
783 return true;
784 needed = (desired ^ effective);
785 }
786 }
787 }
788 return false;
789 }
790
791 /**
792 * Returns an enumeration of all the FilePermission objects in the
793 * container.
794 *
795 * @return an enumeration of all the FilePermission objects.
796 */
797
798 public Enumeration<Permission> elements() {
799 // Convert Iterator into Enumeration
800 synchronized (this) {
801 return Collections.enumeration(perms);
802 }
803 }
804
805 private static final long serialVersionUID = 2202956749081564585L;
806
807 // Need to maintain serialization interoperability with earlier releases,
808 // which had the serializable field:
809 // private Vector permissions;
810
811 /**
812 * @serialField permissions java.util.Vector
813 * A list of FilePermission objects.
814 */
815 private static final ObjectStreamField[] serialPersistentFields = {
816 new ObjectStreamField("permissions", Vector.class),
817 };
818
819 /**
820 * @serialData "permissions" field (a Vector containing the FilePermissions).
821 */
822 /*
823 * Writes the contents of the perms field out as a Vector for
824 * serialization compatibility with earlier releases.
825 */
826 private void writeObject(ObjectOutputStream out) throws IOException {
827 // Don't call out.defaultWriteObject()
828
829 // Write out Vector
830 Vector<Permission> permissions = new Vector<>(perms.size());
831 synchronized (this) {
832 permissions.addAll(perms);
833 }
834
835 ObjectOutputStream.PutField pfields = out.putFields();
836 pfields.put("permissions", permissions);
837 out.writeFields();
838 }
839
840 /*
841 * Reads in a Vector of FilePermissions and saves them in the perms field.
842 */
843 private void readObject(ObjectInputStream in) throws IOException,
844 ClassNotFoundException {
845 // Don't call defaultReadObject()
846
847 // Read in serialized fields
848 ObjectInputStream.GetField gfields = in.readFields();
849
850 // Get the one we want
851 @SuppressWarnings("unchecked")
852 Vector<Permission> permissions = (Vector<Permission>)gfields.get("permissions", null);
853 perms = new ArrayList<>(permissions.size());
854 perms.addAll(permissions);
855 }
856 }