1 /*
2 * Copyright (c) 1997, 2014, 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 java.util.StringJoiner;
35 import sun.security.util.SecurityConstants;
36
37 /**
38 * This class represents access to a file or directory. A FilePermission consists
39 * of a pathname and a set of actions valid for that pathname.
40 * <P>
41 * Pathname is the pathname of the file or directory granted the specified
42 * actions. A pathname that ends in "/*" (where "/" is
43 * the file separator character, <code>File.separatorChar</code>) indicates
44 * all the files and directories contained in that directory. A pathname
45 * that ends with "/-" indicates (recursively) all files
46 * and subdirectories contained in that directory. A pathname consisting of
47 * the special token "<<ALL FILES>>" matches <b>any</b> file.
48 * <P>
49 * Note: A pathname consisting of a single "*" indicates all the files
50 * in the current directory, while a pathname consisting of a single "-"
51 * indicates all the files in the current directory and
52 * (recursively) all files and subdirectories contained in the current
53 * directory.
54 * <P>
55 * The actions to be granted are passed to the constructor in a string containing
56 * a list of one or more comma-separated keywords. The possible keywords are
57 * "read", "write", "execute", "delete", and "readlink". Their meaning is
58 * defined as follows:
59 *
60 * <DL>
61 * <DT> read <DD> read permission
62 * <DT> write <DD> write permission
63 * <DT> execute
64 * <DD> execute permission. Allows <code>Runtime.exec</code> to
65 * be called. Corresponds to <code>SecurityManager.checkExec</code>.
66 * <DT> delete
67 * <DD> delete permission. Allows <code>File.delete</code> to
68 * be called. Corresponds to <code>SecurityManager.checkDelete</code>.
69 * <DT> readlink
70 * <DD> read link permission. Allows the target of a
71 * <a href="../nio/file/package-summary.html#links">symbolic link</a>
72 * to be read by invoking the {@link java.nio.file.Files#readSymbolicLink
73 * readSymbolicLink } method.
74 * </DL>
75 * <P>
76 * The actions string is converted to lowercase before processing.
77 * <P>
78 * Be careful when granting FilePermissions. Think about the implications
79 * of granting read and especially write access to various files and
80 * directories. The "<<ALL FILES>>" permission with write action is
81 * especially dangerous. This grants permission to write to the entire
82 * file system. One thing this effectively allows is replacement of the
83 * system binary, including the JVM runtime environment.
84 *
85 * <p>Please note: Code can always read a file from the same
86 * directory it's in (or a subdirectory of that directory); it does not
87 * need explicit permission to do so.
88 *
89 * @see java.security.Permission
90 * @see java.security.Permissions
91 * @see java.security.PermissionCollection
92 *
93 *
94 * @author Marianne Mueller
95 * @author Roland Schemers
96 * @since 1.2
97 *
98 * @serial exclude
99 */
100
101 public final class FilePermission extends Permission implements Serializable {
102
103 /**
104 * Execute action.
105 */
106 private final static int EXECUTE = 0x1;
107 /**
108 * Write action.
109 */
110 private final static int WRITE = 0x2;
111 /**
112 * Read action.
113 */
114 private final static int READ = 0x4;
115 /**
116 * Delete action.
117 */
118 private final static int DELETE = 0x8;
119 /**
120 * Read link action.
121 */
122 private final static int READLINK = 0x10;
123
124 /**
125 * All actions (read,write,execute,delete,readlink)
126 */
127 private final static int ALL = READ|WRITE|EXECUTE|DELETE|READLINK;
128 /**
129 * No actions.
130 */
131 private final static int NONE = 0x0;
132
133 // the actions mask
134 private transient int mask;
135
136 // does path indicate a directory? (wildcard or recursive)
137 private transient boolean directory;
138
139 // is it a recursive directory specification?
140 private transient boolean recursive;
141
142 /**
143 * the actions string.
144 *
145 * @serial
146 */
147 private String actions; // Left null as long as possible, then
148 // created and re-used in the getAction function.
149
150 // canonicalized dir path. In the case of
151 // directories, it is the name "/blah/*" or "/blah/-" without
152 // the last character (the "*" or "-").
153
154 private transient String cpath;
155
156 // static Strings used by init(int mask)
157 private static final char RECURSIVE_CHAR = '-';
158 private static final char WILD_CHAR = '*';
159
160 /*
161 public String toString()
162 {
163 StringBuffer sb = new StringBuffer();
164 sb.append("***\n");
165 sb.append("cpath = "+cpath+"\n");
166 sb.append("mask = "+mask+"\n");
167 sb.append("actions = "+getActions()+"\n");
168 sb.append("directory = "+directory+"\n");
169 sb.append("recursive = "+recursive+"\n");
170 sb.append("***\n");
171 return sb.toString();
172 }
173 */
174
175 private static final long serialVersionUID = 7930732926638008763L;
176
177 /**
178 * initialize a FilePermission object. Common to all constructors.
179 * Also called during de-serialization.
180 *
181 * @param mask the actions mask to use.
182 *
183 */
184 private void init(int mask) {
185 if ((mask & ALL) != mask)
186 throw new IllegalArgumentException("invalid actions mask");
187
188 if (mask == NONE)
189 throw new IllegalArgumentException("invalid actions mask");
190
191 if ((cpath = getName()) == null)
192 throw new NullPointerException("name can't be null");
193
194 this.mask = mask;
195
196 if (cpath.equals("<<ALL FILES>>")) {
197 directory = true;
198 recursive = true;
199 cpath = "";
200 return;
201 }
202
203 // store only the canonical cpath if possible
204 cpath = AccessController.doPrivileged(new PrivilegedAction<>() {
205 public String run() {
206 try {
207 String path = cpath;
208 if (cpath.endsWith("*")) {
209 // call getCanonicalPath with a path with wildcard character
210 // replaced to avoid calling it with paths that are
211 // intended to match all entries in a directory
212 path = path.substring(0, path.length()-1) + "-";
213 path = new File(path).getCanonicalPath();
214 return path.substring(0, path.length()-1) + "*";
215 } else {
216 return new File(path).getCanonicalPath();
217 }
218 } catch (IOException ioe) {
219 return cpath;
220 }
221 }
222 });
223
224 int len = cpath.length();
225 char last = ((len > 0) ? cpath.charAt(len - 1) : 0);
226
227 if (last == RECURSIVE_CHAR &&
228 cpath.charAt(len - 2) == File.separatorChar) {
229 directory = true;
230 recursive = true;
231 cpath = cpath.substring(0, --len);
232 } else if (last == WILD_CHAR &&
233 cpath.charAt(len - 2) == File.separatorChar) {
234 directory = true;
235 //recursive = false;
236 cpath = cpath.substring(0, --len);
237 } else {
238 // overkill since they are initialized to false, but
239 // commented out here to remind us...
240 //directory = false;
241 //recursive = false;
242 }
243
244 // XXX: at this point the path should be absolute. die if it isn't?
245 }
246
247 /**
248 * Creates a new FilePermission object with the specified actions.
249 * <i>path</i> is the pathname of a file or directory, and <i>actions</i>
250 * contains a comma-separated list of the desired actions granted on the
251 * file or directory. Possible actions are
252 * "read", "write", "execute", "delete", and "readlink".
253 *
254 * <p>A pathname that ends in "/*" (where "/" is
255 * the file separator character, <code>File.separatorChar</code>)
256 * indicates all the files and directories contained in that directory.
257 * A pathname that ends with "/-" indicates (recursively) all files and
258 * subdirectories contained in that directory. The special pathname
259 * "<<ALL FILES>>" matches any file.
260 *
261 * <p>A pathname consisting of a single "*" indicates all the files
262 * in the current directory, while a pathname consisting of a single "-"
263 * indicates all the files in the current directory and
264 * (recursively) all files and subdirectories contained in the current
265 * directory.
266 *
267 * <p>A pathname containing an empty string represents an empty path.
268 *
269 * @param path the pathname of the file/directory.
270 * @param actions the action string.
271 *
272 * @throws IllegalArgumentException
273 * If actions is <code>null</code>, empty or contains an action
274 * other than the specified possible actions.
275 */
276 public FilePermission(String path, String actions) {
277 super(path);
278 init(getMask(actions));
279 }
280
281 /**
282 * Creates a new FilePermission object using an action mask.
283 * More efficient than the FilePermission(String, String) constructor.
284 * Can be used from within
285 * code that needs to create a FilePermission object to pass into the
286 * <code>implies</code> method.
287 *
288 * @param path the pathname of the file/directory.
289 * @param mask the action mask to use.
290 */
291
292 // package private for use by the FilePermissionCollection add method
293 FilePermission(String path, int mask) {
294 super(path);
295 init(mask);
296 }
297
298 /**
299 * Checks if this FilePermission object "implies" the specified permission.
300 * <P>
301 * More specifically, this method returns true if:
302 * <ul>
303 * <li> <i>p</i> is an instanceof FilePermission,
304 * <li> <i>p</i>'s actions are a proper subset of this
305 * object's actions, and
306 * <li> <i>p</i>'s pathname is implied by this object's
307 * pathname. For example, "/tmp/*" implies "/tmp/foo", since
308 * "/tmp/*" encompasses all files in the "/tmp" directory,
309 * including the one named "foo".
310 * </ul>
311 *
312 * @param p the permission to check against.
313 *
314 * @return <code>true</code> if the specified permission is not
315 * <code>null</code> and is implied by this object,
316 * <code>false</code> otherwise.
317 */
318 public boolean implies(Permission p) {
319 if (!(p instanceof FilePermission))
320 return false;
321
322 FilePermission that = (FilePermission) p;
323
324 // we get the effective mask. i.e., the "and" of this and that.
325 // They must be equal to that.mask for implies to return true.
326
327 return ((this.mask & that.mask) == that.mask) && impliesIgnoreMask(that);
328 }
329
330 /**
331 * Checks if the Permission's actions are a proper subset of the
332 * this object's actions. Returns the effective mask iff the
333 * this FilePermission's path also implies that FilePermission's path.
334 *
335 * @param that the FilePermission to check against.
336 * @return the effective mask
337 */
338 boolean impliesIgnoreMask(FilePermission that) {
339 if (this.directory) {
340 if (this.recursive) {
341 // make sure that.path is longer then path so
342 // something like /foo/- does not imply /foo
343 if (that.directory) {
344 return (that.cpath.length() >= this.cpath.length()) &&
345 that.cpath.startsWith(this.cpath);
346 } else {
347 return ((that.cpath.length() > this.cpath.length()) &&
348 that.cpath.startsWith(this.cpath));
349 }
350 } else {
351 if (that.directory) {
352 // if the permission passed in is a directory
353 // specification, make sure that a non-recursive
354 // permission (i.e., this object) can't imply a recursive
355 // permission.
356 if (that.recursive)
357 return false;
358 else
359 return (this.cpath.equals(that.cpath));
360 } else {
361 int last = that.cpath.lastIndexOf(File.separatorChar);
362 if (last == -1)
363 return false;
364 else {
365 // this.cpath.equals(that.cpath.substring(0, last+1));
366 // Use regionMatches to avoid creating new string
367 return (this.cpath.length() == (last + 1)) &&
368 this.cpath.regionMatches(0, that.cpath, 0, last+1);
369 }
370 }
371 }
372 } else if (that.directory) {
373 // if this is NOT recursive/wildcarded,
374 // do not let it imply a recursive/wildcarded permission
375 return false;
376 } else {
377 return (this.cpath.equals(that.cpath));
378 }
379 }
380
381 /**
382 * Checks two FilePermission objects for equality. Checks that <i>obj</i> is
383 * a FilePermission, and has the same pathname and actions as this object.
384 *
385 * @param obj the object we are testing for equality with this object.
386 * @return <code>true</code> if obj is a FilePermission, and has the same
387 * pathname and actions as this FilePermission object,
388 * <code>false</code> otherwise.
389 */
390 public boolean equals(Object obj) {
391 if (obj == this)
392 return true;
393
394 if (! (obj instanceof FilePermission))
395 return false;
396
397 FilePermission that = (FilePermission) obj;
398
399 return (this.mask == that.mask) &&
400 this.cpath.equals(that.cpath) &&
401 (this.directory == that.directory) &&
402 (this.recursive == that.recursive);
403 }
404
405 /**
406 * Returns the hash code value for this object.
407 *
408 * @return a hash code value for this object.
409 */
410 public int hashCode() {
411 return 0;
412 }
413
414 /**
415 * Converts an actions String to an actions mask.
416 *
417 * @param actions the action string.
418 * @return the actions mask.
419 */
420 private static int getMask(String actions) {
421 int mask = NONE;
422
423 // Null action valid?
424 if (actions == null) {
425 return mask;
426 }
427
428 // Use object identity comparison against known-interned strings for
429 // performance benefit (these values are used heavily within the JDK).
430 if (actions == SecurityConstants.FILE_READ_ACTION) {
431 return READ;
432 } else if (actions == SecurityConstants.FILE_WRITE_ACTION) {
433 return WRITE;
434 } else if (actions == SecurityConstants.FILE_EXECUTE_ACTION) {
435 return EXECUTE;
436 } else if (actions == SecurityConstants.FILE_DELETE_ACTION) {
437 return DELETE;
438 } else if (actions == SecurityConstants.FILE_READLINK_ACTION) {
439 return READLINK;
440 }
441
442 char[] a = actions.toCharArray();
443
444 int i = a.length - 1;
445 if (i < 0)
446 return mask;
447
448 while (i != -1) {
449 char c;
450
451 // skip whitespace
452 while ((i!=-1) && ((c = a[i]) == ' ' ||
453 c == '\r' ||
454 c == '\n' ||
455 c == '\f' ||
456 c == '\t'))
457 i--;
458
459 // check for the known strings
460 int matchlen;
461
462 if (i >= 3 && (a[i-3] == 'r' || a[i-3] == 'R') &&
463 (a[i-2] == 'e' || a[i-2] == 'E') &&
464 (a[i-1] == 'a' || a[i-1] == 'A') &&
465 (a[i] == 'd' || a[i] == 'D'))
466 {
467 matchlen = 4;
468 mask |= READ;
469
470 } else if (i >= 4 && (a[i-4] == 'w' || a[i-4] == 'W') &&
471 (a[i-3] == 'r' || a[i-3] == 'R') &&
472 (a[i-2] == 'i' || a[i-2] == 'I') &&
473 (a[i-1] == 't' || a[i-1] == 'T') &&
474 (a[i] == 'e' || a[i] == 'E'))
475 {
476 matchlen = 5;
477 mask |= WRITE;
478
479 } else if (i >= 6 && (a[i-6] == 'e' || a[i-6] == 'E') &&
480 (a[i-5] == 'x' || a[i-5] == 'X') &&
481 (a[i-4] == 'e' || a[i-4] == 'E') &&
482 (a[i-3] == 'c' || a[i-3] == 'C') &&
483 (a[i-2] == 'u' || a[i-2] == 'U') &&
484 (a[i-1] == 't' || a[i-1] == 'T') &&
485 (a[i] == 'e' || a[i] == 'E'))
486 {
487 matchlen = 7;
488 mask |= EXECUTE;
489
490 } else if (i >= 5 && (a[i-5] == 'd' || a[i-5] == 'D') &&
491 (a[i-4] == 'e' || a[i-4] == 'E') &&
492 (a[i-3] == 'l' || a[i-3] == 'L') &&
493 (a[i-2] == 'e' || a[i-2] == 'E') &&
494 (a[i-1] == 't' || a[i-1] == 'T') &&
495 (a[i] == 'e' || a[i] == 'E'))
496 {
497 matchlen = 6;
498 mask |= DELETE;
499
500 } else if (i >= 7 && (a[i-7] == 'r' || a[i-7] == 'R') &&
501 (a[i-6] == 'e' || a[i-6] == 'E') &&
502 (a[i-5] == 'a' || a[i-5] == 'A') &&
503 (a[i-4] == 'd' || a[i-4] == 'D') &&
504 (a[i-3] == 'l' || a[i-3] == 'L') &&
505 (a[i-2] == 'i' || a[i-2] == 'I') &&
506 (a[i-1] == 'n' || a[i-1] == 'N') &&
507 (a[i] == 'k' || a[i] == 'K'))
508 {
509 matchlen = 8;
510 mask |= READLINK;
511
512 } else {
513 // parse error
514 throw new IllegalArgumentException(
515 "invalid permission: " + actions);
516 }
517
518 // make sure we didn't just match the tail of a word
519 // like "ackbarfaccept". Also, skip to the comma.
520 boolean seencomma = false;
521 while (i >= matchlen && !seencomma) {
522 switch(a[i-matchlen]) {
523 case ',':
524 seencomma = true;
525 break;
526 case ' ': case '\r': case '\n':
527 case '\f': case '\t':
528 break;
529 default:
530 throw new IllegalArgumentException(
531 "invalid permission: " + actions);
532 }
533 i--;
534 }
535
536 // point i at the location of the comma minus one (or -1).
537 i -= matchlen;
538 }
539
540 return mask;
541 }
542
543 /**
544 * Return the current action mask. Used by the FilePermissionCollection.
545 *
546 * @return the actions mask.
547 */
548 int getMask() {
549 return mask;
550 }
551
552 /**
553 * Return the canonical string representation of the actions.
554 * Always returns present actions in the following order:
555 * read, write, execute, delete, readlink.
556 *
557 * @return the canonical string representation of the actions.
558 */
559 private static String getActions(int mask) {
560 StringJoiner sj = new StringJoiner(",");
561
562 if ((mask & READ) == READ) {
563 sj.add("read");
564 }
565 if ((mask & WRITE) == WRITE) {
566 sj.add("write");
567 }
568 if ((mask & EXECUTE) == EXECUTE) {
569 sj.add("execute");
570 }
571 if ((mask & DELETE) == DELETE) {
572 sj.add("delete");
573 }
574 if ((mask & READLINK) == READLINK) {
575 sj.add("readlink");
576 }
577
578 return sj.toString();
579 }
580
581 /**
582 * Returns the "canonical string representation" of the actions.
583 * That is, this method always returns present actions in the following order:
584 * read, write, execute, delete, readlink. For example, if this FilePermission
585 * object allows both write and read actions, a call to <code>getActions</code>
586 * will return the string "read,write".
587 *
588 * @return the canonical string representation of the actions.
589 */
590 public String getActions() {
591 if (actions == null)
592 actions = getActions(this.mask);
593
594 return actions;
595 }
596
597 /**
598 * Returns a new PermissionCollection object for storing FilePermission
599 * objects.
600 * <p>
601 * FilePermission objects must be stored in a manner that allows them
602 * to be inserted into the collection in any order, but that also enables the
603 * PermissionCollection <code>implies</code>
604 * method to be implemented in an efficient (and consistent) manner.
605 *
606 * <p>For example, if you have two FilePermissions:
607 * <OL>
608 * <LI> <code>"/tmp/-", "read"</code>
609 * <LI> <code>"/tmp/scratch/foo", "write"</code>
610 * </OL>
611 *
612 * <p>and you are calling the <code>implies</code> method with the FilePermission:
613 *
614 * <pre>
615 * "/tmp/scratch/foo", "read,write",
616 * </pre>
617 *
618 * then the <code>implies</code> function must
619 * take into account both the "/tmp/-" and "/tmp/scratch/foo"
620 * permissions, so the effective permission is "read,write",
621 * and <code>implies</code> returns true. The "implies" semantics for
622 * FilePermissions are handled properly by the PermissionCollection object
623 * returned by this <code>newPermissionCollection</code> method.
624 *
625 * @return a new PermissionCollection object suitable for storing
626 * FilePermissions.
627 */
628 public PermissionCollection newPermissionCollection() {
629 return new FilePermissionCollection();
630 }
631
632 /**
633 * WriteObject is called to save the state of the FilePermission
634 * to a stream. The actions are serialized, and the superclass
635 * takes care of the name.
636 */
637 private void writeObject(ObjectOutputStream s)
638 throws IOException
639 {
640 // Write out the actions. The superclass takes care of the name
641 // call getActions to make sure actions field is initialized
642 if (actions == null)
643 getActions();
644 s.defaultWriteObject();
645 }
646
647 /**
648 * readObject is called to restore the state of the FilePermission from
649 * a stream.
650 */
651 private void readObject(ObjectInputStream s)
652 throws IOException, ClassNotFoundException
653 {
654 // Read in the actions, then restore everything else by calling init.
655 s.defaultReadObject();
656 init(getMask(actions));
657 }
658 }
659
660 /**
661 * A FilePermissionCollection stores a set of FilePermission permissions.
662 * FilePermission objects
663 * must be stored in a manner that allows them to be inserted in any
664 * order, but enable the implies function to evaluate the implies
665 * method.
666 * For example, if you have two FilePermissions:
667 * <OL>
668 * <LI> "/tmp/-", "read"
669 * <LI> "/tmp/scratch/foo", "write"
670 * </OL>
671 * And you are calling the implies function with the FilePermission:
672 * "/tmp/scratch/foo", "read,write", then the implies function must
673 * take into account both the /tmp/- and /tmp/scratch/foo
674 * permissions, so the effective permission is "read,write".
675 *
676 * @see java.security.Permission
677 * @see java.security.Permissions
678 * @see java.security.PermissionCollection
679 *
680 *
681 * @author Marianne Mueller
682 * @author Roland Schemers
683 *
684 * @serial include
685 *
686 */
687
688 final class FilePermissionCollection extends PermissionCollection
689 implements Serializable
690 {
691 // Not serialized; see serialization section at end of class
692 private transient List<Permission> perms;
693
694 /**
695 * Create an empty FilePermissionCollection object.
696 */
697 public FilePermissionCollection() {
698 perms = new ArrayList<>();
699 }
700
701 /**
702 * Adds a permission to the FilePermissionCollection. The key for the hash is
703 * permission.path.
704 *
705 * @param permission the Permission object to add.
706 *
707 * @exception IllegalArgumentException - if the permission is not a
708 * FilePermission
709 *
710 * @exception SecurityException - if this FilePermissionCollection object
711 * has been marked readonly
712 */
713 public void add(Permission permission) {
714 if (! (permission instanceof FilePermission))
715 throw new IllegalArgumentException("invalid permission: "+
716 permission);
717 if (isReadOnly())
718 throw new SecurityException(
719 "attempt to add a Permission to a readonly PermissionCollection");
720
721 synchronized (this) {
722 perms.add(permission);
723 }
724 }
725
726 /**
727 * Check and see if this set of permissions implies the permissions
728 * expressed in "permission".
729 *
730 * @param permission the Permission object to compare
731 *
732 * @return true if "permission" is a proper subset of a permission in
733 * the set, false if not.
734 */
735 public boolean implies(Permission permission) {
736 if (! (permission instanceof FilePermission))
737 return false;
738
739 FilePermission fp = (FilePermission) permission;
740
741 int desired = fp.getMask();
742 int effective = 0;
743 int needed = desired;
744
745 synchronized (this) {
746 int len = perms.size();
747 for (int i = 0; i < len; i++) {
748 FilePermission x = (FilePermission) perms.get(i);
749 if (((needed & x.getMask()) != 0) && x.impliesIgnoreMask(fp)) {
750 effective |= x.getMask();
751 if ((effective & desired) == desired)
752 return true;
753 needed = (desired ^ effective);
754 }
755 }
756 }
757 return false;
758 }
759
760 /**
761 * Returns an enumeration of all the FilePermission objects in the
762 * container.
763 *
764 * @return an enumeration of all the FilePermission objects.
765 */
766 public Enumeration<Permission> elements() {
767 // Convert Iterator into Enumeration
768 synchronized (this) {
769 return Collections.enumeration(perms);
770 }
771 }
772
773 private static final long serialVersionUID = 2202956749081564585L;
774
775 // Need to maintain serialization interoperability with earlier releases,
776 // which had the serializable field:
777 // private Vector permissions;
778
779 /**
780 * @serialField permissions java.util.Vector
781 * A list of FilePermission objects.
782 */
783 private static final ObjectStreamField[] serialPersistentFields = {
784 new ObjectStreamField("permissions", Vector.class),
785 };
786
787 /**
788 * @serialData "permissions" field (a Vector containing the FilePermissions).
789 */
790 /*
791 * Writes the contents of the perms field out as a Vector for
792 * serialization compatibility with earlier releases.
793 */
794 private void writeObject(ObjectOutputStream out) throws IOException {
795 // Don't call out.defaultWriteObject()
796
797 // Write out Vector
798 Vector<Permission> permissions = new Vector<>(perms.size());
799 synchronized (this) {
800 permissions.addAll(perms);
801 }
802
803 ObjectOutputStream.PutField pfields = out.putFields();
804 pfields.put("permissions", permissions);
805 out.writeFields();
806 }
807
808 /*
809 * Reads in a Vector of FilePermissions and saves them in the perms field.
810 */
811 private void readObject(ObjectInputStream in)
812 throws IOException, ClassNotFoundException
813 {
814 // Don't call defaultReadObject()
815
816 // Read in serialized fields
817 ObjectInputStream.GetField gfields = in.readFields();
818
819 // Get the one we want
820 @SuppressWarnings("unchecked")
821 Vector<Permission> permissions = (Vector<Permission>)gfields.get("permissions", null);
822 perms = new ArrayList<>(permissions.size());
823 perms.addAll(permissions);
824 }
825 }