1 /*-
2 * Copyright (c) 2008-2010 Edward Tomasz NapieraĆa <trasz@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 /*
28 * ACL support routines specific to NFSv4 access control lists. These are
29 * utility routines for code common across file systems implementing NFSv4
30 * ACLs.
31 */
32
33 #ifdef _KERNEL
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD: releng/10.2/sys/kern/subr_acl_nfs4.c 234385 2012-04-17 14:54:00Z trasz $");
36
37 #include <sys/param.h>
38 #include <sys/kernel.h>
39 #include <sys/module.h>
40 #include <sys/systm.h>
41 #include <sys/mount.h>
42 #include <sys/priv.h>
43 #include <sys/vnode.h>
44 #include <sys/errno.h>
45 #include <sys/stat.h>
46 #include <sys/sysctl.h>
47 #include <sys/acl.h>
48 #else
49 #include <errno.h>
50 #include <assert.h>
51 #include <sys/acl.h>
52 #include <sys/stat.h>
53 #define KASSERT(a, b) assert(a)
54 #define CTASSERT(a)
55
56 #endif /* !_KERNEL */
57
58 #ifdef _KERNEL
59
60 static void acl_nfs4_trivial_from_mode(struct acl *aclp, mode_t mode);
61
62 static int acl_nfs4_old_semantics = 0;
63
64 SYSCTL_INT(_vfs, OID_AUTO, acl_nfs4_old_semantics, CTLFLAG_RW,
65 &acl_nfs4_old_semantics, 0, "Use pre-PSARC/2010/029 NFSv4 ACL semantics");
66
67 static struct {
68 accmode_t accmode;
69 int mask;
70 } accmode2mask[] = {{VREAD, ACL_READ_DATA},
71 {VWRITE, ACL_WRITE_DATA},
72 {VAPPEND, ACL_APPEND_DATA},
73 {VEXEC, ACL_EXECUTE},
74 {VREAD_NAMED_ATTRS, ACL_READ_NAMED_ATTRS},
75 {VWRITE_NAMED_ATTRS, ACL_WRITE_NAMED_ATTRS},
76 {VDELETE_CHILD, ACL_DELETE_CHILD},
77 {VREAD_ATTRIBUTES, ACL_READ_ATTRIBUTES},
78 {VWRITE_ATTRIBUTES, ACL_WRITE_ATTRIBUTES},
79 {VDELETE, ACL_DELETE},
80 {VREAD_ACL, ACL_READ_ACL},
81 {VWRITE_ACL, ACL_WRITE_ACL},
82 {VWRITE_OWNER, ACL_WRITE_OWNER},
83 {VSYNCHRONIZE, ACL_SYNCHRONIZE},
84 {0, 0}};
85
86 static int
87 _access_mask_from_accmode(accmode_t accmode)
88 {
89 int access_mask = 0, i;
90
91 for (i = 0; accmode2mask[i].accmode != 0; i++) {
92 if (accmode & accmode2mask[i].accmode)
93 access_mask |= accmode2mask[i].mask;
94 }
95
96 /*
97 * VAPPEND is just a modifier for VWRITE; if the caller asked
98 * for 'VAPPEND | VWRITE', we want to check for ACL_APPEND_DATA only.
99 */
100 if (access_mask & ACL_APPEND_DATA)
101 access_mask &= ~ACL_WRITE_DATA;
102
103 return (access_mask);
104 }
105
106 /*
107 * Return 0, iff access is allowed, 1 otherwise.
108 */
109 static int
110 _acl_denies(const struct acl *aclp, int access_mask, struct ucred *cred,
111 int file_uid, int file_gid, int *denied_explicitly)
112 {
113 int i;
114 const struct acl_entry *entry;
115
116 if (denied_explicitly != NULL)
117 *denied_explicitly = 0;
118
119 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES,
120 ("aclp->acl_cnt <= ACL_MAX_ENTRIES"));
121
122 for (i = 0; i < aclp->acl_cnt; i++) {
123 entry = &(aclp->acl_entry[i]);
124
125 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW &&
126 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY)
127 continue;
128 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY)
129 continue;
130 switch (entry->ae_tag) {
131 case ACL_USER_OBJ:
132 if (file_uid != cred->cr_uid)
133 continue;
134 break;
135 case ACL_USER:
136 if (entry->ae_id != cred->cr_uid)
137 continue;
138 break;
139 case ACL_GROUP_OBJ:
140 if (!groupmember(file_gid, cred))
141 continue;
142 break;
143 case ACL_GROUP:
144 if (!groupmember(entry->ae_id, cred))
145 continue;
146 break;
147 default:
148 KASSERT(entry->ae_tag == ACL_EVERYONE,
149 ("entry->ae_tag == ACL_EVERYONE"));
150 }
151
152 if (entry->ae_entry_type == ACL_ENTRY_TYPE_DENY) {
153 if (entry->ae_perm & access_mask) {
154 if (denied_explicitly != NULL)
155 *denied_explicitly = 1;
156 return (1);
157 }
158 }
159
160 access_mask &= ~(entry->ae_perm);
161 if (access_mask == 0)
162 return (0);
163 }
164
165 if (access_mask == 0)
166 return (0);
167
168 return (1);
169 }
170
171 int
172 vaccess_acl_nfs4(enum vtype type, uid_t file_uid, gid_t file_gid,
173 struct acl *aclp, accmode_t accmode, struct ucred *cred, int *privused)
174 {
175 accmode_t priv_granted = 0;
176 int denied, explicitly_denied, access_mask, is_directory,
177 must_be_owner = 0;
178 mode_t file_mode = 0;
179
180 KASSERT((accmode & ~(VEXEC | VWRITE | VREAD | VADMIN | VAPPEND |
181 VEXPLICIT_DENY | VREAD_NAMED_ATTRS | VWRITE_NAMED_ATTRS |
182 VDELETE_CHILD | VREAD_ATTRIBUTES | VWRITE_ATTRIBUTES | VDELETE |
183 VREAD_ACL | VWRITE_ACL | VWRITE_OWNER | VSYNCHRONIZE)) == 0,
184 ("invalid bit in accmode"));
185 KASSERT((accmode & VAPPEND) == 0 || (accmode & VWRITE),
186 ("VAPPEND without VWRITE"));
187
188 if (privused != NULL)
189 *privused = 0;
190
191 if (accmode & VADMIN)
192 must_be_owner = 1;
193
194 /*
195 * Ignore VSYNCHRONIZE permission.
196 */
197 accmode &= ~VSYNCHRONIZE;
198
199 access_mask = _access_mask_from_accmode(accmode);
200
201 if (type == VDIR)
202 is_directory = 1;
203 else
204 is_directory = 0;
205
206 /*
207 * File owner is always allowed to read and write the ACL
208 * and basic attributes. This is to prevent a situation
209 * where user would change ACL in a way that prevents him
210 * from undoing the change.
211 */
212 if (file_uid == cred->cr_uid)
213 access_mask &= ~(ACL_READ_ACL | ACL_WRITE_ACL |
214 ACL_READ_ATTRIBUTES | ACL_WRITE_ATTRIBUTES);
215
216 /*
217 * Ignore append permission for regular files; use write
218 * permission instead.
219 */
220 if (!is_directory && (access_mask & ACL_APPEND_DATA)) {
221 access_mask &= ~ACL_APPEND_DATA;
222 access_mask |= ACL_WRITE_DATA;
223 }
224
225 denied = _acl_denies(aclp, access_mask, cred, file_uid, file_gid,
226 &explicitly_denied);
227
228 if (must_be_owner) {
229 if (file_uid != cred->cr_uid)
230 denied = EPERM;
231 }
232
233 /*
234 * For VEXEC, ensure that at least one execute bit is set for
235 * non-directories. We have to check the mode here to stay
236 * consistent with execve(2). See the test in
237 * exec_check_permissions().
238 */
239 acl_nfs4_sync_mode_from_acl(&file_mode, aclp);
240 if (!denied && !is_directory && (accmode & VEXEC) &&
241 (file_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) == 0)
242 denied = EACCES;
243
244 if (!denied)
245 return (0);
246
247 /*
248 * Access failed. Iff it was not denied explicitly and
249 * VEXPLICIT_DENY flag was specified, allow access.
250 */
251 if ((accmode & VEXPLICIT_DENY) && explicitly_denied == 0)
252 return (0);
253
254 accmode &= ~VEXPLICIT_DENY;
255
256 /*
257 * No match. Try to use privileges, if there are any.
258 */
259 if (is_directory) {
260 if ((accmode & VEXEC) && !priv_check_cred(cred,
261 PRIV_VFS_LOOKUP, 0))
262 priv_granted |= VEXEC;
263 } else {
264 /*
265 * Ensure that at least one execute bit is on. Otherwise,
266 * a privileged user will always succeed, and we don't want
267 * this to happen unless the file really is executable.
268 */
269 if ((accmode & VEXEC) && (file_mode &
270 (S_IXUSR | S_IXGRP | S_IXOTH)) != 0 &&
271 !priv_check_cred(cred, PRIV_VFS_EXEC, 0))
272 priv_granted |= VEXEC;
273 }
274
275 if ((accmode & VREAD) && !priv_check_cred(cred, PRIV_VFS_READ, 0))
276 priv_granted |= VREAD;
277
278 if ((accmode & (VWRITE | VAPPEND | VDELETE_CHILD)) &&
279 !priv_check_cred(cred, PRIV_VFS_WRITE, 0))
280 priv_granted |= (VWRITE | VAPPEND | VDELETE_CHILD);
281
282 if ((accmode & VADMIN_PERMS) &&
283 !priv_check_cred(cred, PRIV_VFS_ADMIN, 0))
284 priv_granted |= VADMIN_PERMS;
285
286 if ((accmode & VSTAT_PERMS) &&
287 !priv_check_cred(cred, PRIV_VFS_STAT, 0))
288 priv_granted |= VSTAT_PERMS;
289
290 if ((accmode & priv_granted) == accmode) {
291 if (privused != NULL)
292 *privused = 1;
293
294 return (0);
295 }
296
297 if (accmode & (VADMIN_PERMS | VDELETE_CHILD | VDELETE))
298 denied = EPERM;
299 else
300 denied = EACCES;
301
302 return (denied);
303 }
304 #endif /* _KERNEL */
305
306 static int
307 _acl_entry_matches(struct acl_entry *entry, acl_tag_t tag, acl_perm_t perm,
308 acl_entry_type_t entry_type)
309 {
310 if (entry->ae_tag != tag)
311 return (0);
312
313 if (entry->ae_id != ACL_UNDEFINED_ID)
314 return (0);
315
316 if (entry->ae_perm != perm)
317 return (0);
318
319 if (entry->ae_entry_type != entry_type)
320 return (0);
321
322 if (entry->ae_flags != 0)
323 return (0);
324
325 return (1);
326 }
327
328 static struct acl_entry *
329 _acl_append(struct acl *aclp, acl_tag_t tag, acl_perm_t perm,
330 acl_entry_type_t entry_type)
331 {
332 struct acl_entry *entry;
333
334 KASSERT(aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES,
335 ("aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES"));
336
337 entry = &(aclp->acl_entry[aclp->acl_cnt]);
338 aclp->acl_cnt++;
339
340 entry->ae_tag = tag;
341 entry->ae_id = ACL_UNDEFINED_ID;
342 entry->ae_perm = perm;
343 entry->ae_entry_type = entry_type;
344 entry->ae_flags = 0;
345
346 return (entry);
347 }
348
349 static struct acl_entry *
350 _acl_duplicate_entry(struct acl *aclp, int entry_index)
351 {
352 int i;
353
354 KASSERT(aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES,
355 ("aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES"));
356
357 for (i = aclp->acl_cnt; i > entry_index; i--)
358 aclp->acl_entry[i] = aclp->acl_entry[i - 1];
359
360 aclp->acl_cnt++;
361
362 return (&(aclp->acl_entry[entry_index + 1]));
363 }
364
365 static void
366 acl_nfs4_sync_acl_from_mode_draft(struct acl *aclp, mode_t mode,
367 int file_owner_id)
368 {
369 int i, meets, must_append;
370 struct acl_entry *entry, *copy, *previous,
371 *a1, *a2, *a3, *a4, *a5, *a6;
372 mode_t amode;
373 const int READ = 04;
374 const int WRITE = 02;
375 const int EXEC = 01;
376
377 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES,
378 ("aclp->acl_cnt <= ACL_MAX_ENTRIES"));
379
380 /*
381 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt
382 *
383 * 3.16.6.3. Applying a Mode to an Existing ACL
384 */
385
386 /*
387 * 1. For each ACE:
388 */
389 for (i = 0; i < aclp->acl_cnt; i++) {
390 entry = &(aclp->acl_entry[i]);
391
392 /*
393 * 1.1. If the type is neither ALLOW or DENY - skip.
394 */
395 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW &&
396 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY)
397 continue;
398
399 /*
400 * 1.2. If ACL_ENTRY_INHERIT_ONLY is set - skip.
401 */
402 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY)
403 continue;
404
405 /*
406 * 1.3. If ACL_ENTRY_FILE_INHERIT or ACL_ENTRY_DIRECTORY_INHERIT
407 * are set:
408 */
409 if (entry->ae_flags &
410 (ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT)) {
411 /*
412 * 1.3.1. A copy of the current ACE is made, and placed
413 * in the ACL immediately following the current
414 * ACE.
415 */
416 copy = _acl_duplicate_entry(aclp, i);
417
418 /*
419 * 1.3.2. In the first ACE, the flag
420 * ACL_ENTRY_INHERIT_ONLY is set.
421 */
422 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY;
423
424 /*
425 * 1.3.3. In the second ACE, the following flags
426 * are cleared:
427 * ACL_ENTRY_FILE_INHERIT,
428 * ACL_ENTRY_DIRECTORY_INHERIT,
429 * ACL_ENTRY_NO_PROPAGATE_INHERIT.
430 */
431 copy->ae_flags &= ~(ACL_ENTRY_FILE_INHERIT |
432 ACL_ENTRY_DIRECTORY_INHERIT |
433 ACL_ENTRY_NO_PROPAGATE_INHERIT);
434
435 /*
436 * The algorithm continues on with the second ACE.
437 */
438 i++;
439 entry = copy;
440 }
441
442 /*
443 * 1.4. If it's owner@, group@ or everyone@ entry, clear
444 * ACL_READ_DATA, ACL_WRITE_DATA, ACL_APPEND_DATA
445 * and ACL_EXECUTE. Continue to the next entry.
446 */
447 if (entry->ae_tag == ACL_USER_OBJ ||
448 entry->ae_tag == ACL_GROUP_OBJ ||
449 entry->ae_tag == ACL_EVERYONE) {
450 entry->ae_perm &= ~(ACL_READ_DATA | ACL_WRITE_DATA |
451 ACL_APPEND_DATA | ACL_EXECUTE);
452 continue;
453 }
454
455 /*
456 * 1.5. Otherwise, if the "who" field did not match one
457 * of OWNER@, GROUP@, EVERYONE@:
458 *
459 * 1.5.1. If the type is ALLOW, check the preceding ACE.
460 * If it does not meet all of the following criteria:
461 */
462 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW)
463 continue;
464
465 meets = 0;
466 if (i > 0) {
467 meets = 1;
468 previous = &(aclp->acl_entry[i - 1]);
469
470 /*
471 * 1.5.1.1. The type field is DENY,
472 */
473 if (previous->ae_entry_type != ACL_ENTRY_TYPE_DENY)
474 meets = 0;
475
476 /*
477 * 1.5.1.2. The "who" field is the same as the current
478 * ACE,
479 *
480 * 1.5.1.3. The flag bit ACE4_IDENTIFIER_GROUP
481 * is the same as it is in the current ACE,
482 * and no other flag bits are set,
483 */
484 if (previous->ae_id != entry->ae_id ||
485 previous->ae_tag != entry->ae_tag)
486 meets = 0;
487
488 if (previous->ae_flags)
489 meets = 0;
490
491 /*
492 * 1.5.1.4. The mask bits are a subset of the mask bits
493 * of the current ACE, and are also subset of
494 * the following: ACL_READ_DATA,
495 * ACL_WRITE_DATA, ACL_APPEND_DATA, ACL_EXECUTE
496 */
497 if (previous->ae_perm & ~(entry->ae_perm))
498 meets = 0;
499
500 if (previous->ae_perm & ~(ACL_READ_DATA |
501 ACL_WRITE_DATA | ACL_APPEND_DATA | ACL_EXECUTE))
502 meets = 0;
503 }
504
505 if (!meets) {
506 /*
507 * Then the ACE of type DENY, with a who equal
508 * to the current ACE, flag bits equal to
509 * (<current ACE flags> & <ACE_IDENTIFIER_GROUP>)
510 * and no mask bits, is prepended.
511 */
512 previous = entry;
513 entry = _acl_duplicate_entry(aclp, i);
514
515 /* Adjust counter, as we've just added an entry. */
516 i++;
517
518 previous->ae_tag = entry->ae_tag;
519 previous->ae_id = entry->ae_id;
520 previous->ae_flags = entry->ae_flags;
521 previous->ae_perm = 0;
522 previous->ae_entry_type = ACL_ENTRY_TYPE_DENY;
523 }
524
525 /*
526 * 1.5.2. The following modifications are made to the prepended
527 * ACE. The intent is to mask the following ACE
528 * to disallow ACL_READ_DATA, ACL_WRITE_DATA,
529 * ACL_APPEND_DATA, or ACL_EXECUTE, based upon the group
530 * permissions of the new mode. As a special case,
531 * if the ACE matches the current owner of the file,
532 * the owner bits are used, rather than the group bits.
533 * This is reflected in the algorithm below.
534 */
535 amode = mode >> 3;
536
537 /*
538 * If ACE4_IDENTIFIER_GROUP is not set, and the "who" field
539 * in ACE matches the owner of the file, we shift amode three
540 * more bits, in order to have the owner permission bits
541 * placed in the three low order bits of amode.
542 */
543 if (entry->ae_tag == ACL_USER && entry->ae_id == file_owner_id)
544 amode = amode >> 3;
545
546 if (entry->ae_perm & ACL_READ_DATA) {
547 if (amode & READ)
548 previous->ae_perm &= ~ACL_READ_DATA;
549 else
550 previous->ae_perm |= ACL_READ_DATA;
551 }
552
553 if (entry->ae_perm & ACL_WRITE_DATA) {
554 if (amode & WRITE)
555 previous->ae_perm &= ~ACL_WRITE_DATA;
556 else
557 previous->ae_perm |= ACL_WRITE_DATA;
558 }
559
560 if (entry->ae_perm & ACL_APPEND_DATA) {
561 if (amode & WRITE)
562 previous->ae_perm &= ~ACL_APPEND_DATA;
563 else
564 previous->ae_perm |= ACL_APPEND_DATA;
565 }
566
567 if (entry->ae_perm & ACL_EXECUTE) {
568 if (amode & EXEC)
569 previous->ae_perm &= ~ACL_EXECUTE;
570 else
571 previous->ae_perm |= ACL_EXECUTE;
572 }
573
574 /*
575 * 1.5.3. If ACE4_IDENTIFIER_GROUP is set in the flags
576 * of the ALLOW ace:
577 *
578 * XXX: This point is not there in the Falkner's draft.
579 */
580 if (entry->ae_tag == ACL_GROUP &&
581 entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) {
582 mode_t extramode, ownermode;
583 extramode = (mode >> 3) & 07;
584 ownermode = mode >> 6;
585 extramode &= ~ownermode;
586
587 if (extramode) {
588 if (extramode & READ) {
589 entry->ae_perm &= ~ACL_READ_DATA;
590 previous->ae_perm &= ~ACL_READ_DATA;
591 }
592
593 if (extramode & WRITE) {
594 entry->ae_perm &=
595 ~(ACL_WRITE_DATA | ACL_APPEND_DATA);
596 previous->ae_perm &=
597 ~(ACL_WRITE_DATA | ACL_APPEND_DATA);
598 }
599
600 if (extramode & EXEC) {
601 entry->ae_perm &= ~ACL_EXECUTE;
602 previous->ae_perm &= ~ACL_EXECUTE;
603 }
604 }
605 }
606 }
607
608 /*
609 * 2. If there at least six ACEs, the final six ACEs are examined.
610 * If they are not equal to what we want, append six ACEs.
611 */
612 must_append = 0;
613 if (aclp->acl_cnt < 6) {
614 must_append = 1;
615 } else {
616 a6 = &(aclp->acl_entry[aclp->acl_cnt - 1]);
617 a5 = &(aclp->acl_entry[aclp->acl_cnt - 2]);
618 a4 = &(aclp->acl_entry[aclp->acl_cnt - 3]);
619 a3 = &(aclp->acl_entry[aclp->acl_cnt - 4]);
620 a2 = &(aclp->acl_entry[aclp->acl_cnt - 5]);
621 a1 = &(aclp->acl_entry[aclp->acl_cnt - 6]);
622
623 if (!_acl_entry_matches(a1, ACL_USER_OBJ, 0,
624 ACL_ENTRY_TYPE_DENY))
625 must_append = 1;
626 if (!_acl_entry_matches(a2, ACL_USER_OBJ, ACL_WRITE_ACL |
627 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES |
628 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_ALLOW))
629 must_append = 1;
630 if (!_acl_entry_matches(a3, ACL_GROUP_OBJ, 0,
631 ACL_ENTRY_TYPE_DENY))
632 must_append = 1;
633 if (!_acl_entry_matches(a4, ACL_GROUP_OBJ, 0,
634 ACL_ENTRY_TYPE_ALLOW))
635 must_append = 1;
636 if (!_acl_entry_matches(a5, ACL_EVERYONE, ACL_WRITE_ACL |
637 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES |
638 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_DENY))
639 must_append = 1;
640 if (!_acl_entry_matches(a6, ACL_EVERYONE, ACL_READ_ACL |
641 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS |
642 ACL_SYNCHRONIZE, ACL_ENTRY_TYPE_ALLOW))
643 must_append = 1;
644 }
645
646 if (must_append) {
647 KASSERT(aclp->acl_cnt + 6 <= ACL_MAX_ENTRIES,
648 ("aclp->acl_cnt <= ACL_MAX_ENTRIES"));
649
650 a1 = _acl_append(aclp, ACL_USER_OBJ, 0, ACL_ENTRY_TYPE_DENY);
651 a2 = _acl_append(aclp, ACL_USER_OBJ, ACL_WRITE_ACL |
652 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES |
653 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_ALLOW);
654 a3 = _acl_append(aclp, ACL_GROUP_OBJ, 0, ACL_ENTRY_TYPE_DENY);
655 a4 = _acl_append(aclp, ACL_GROUP_OBJ, 0, ACL_ENTRY_TYPE_ALLOW);
656 a5 = _acl_append(aclp, ACL_EVERYONE, ACL_WRITE_ACL |
657 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES |
658 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_DENY);
659 a6 = _acl_append(aclp, ACL_EVERYONE, ACL_READ_ACL |
660 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS |
661 ACL_SYNCHRONIZE, ACL_ENTRY_TYPE_ALLOW);
662
663 KASSERT(a1 != NULL && a2 != NULL && a3 != NULL && a4 != NULL &&
664 a5 != NULL && a6 != NULL, ("couldn't append to ACL."));
665 }
666
667 /*
668 * 3. The final six ACEs are adjusted according to the incoming mode.
669 */
670 if (mode & S_IRUSR)
671 a2->ae_perm |= ACL_READ_DATA;
672 else
673 a1->ae_perm |= ACL_READ_DATA;
674 if (mode & S_IWUSR)
675 a2->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
676 else
677 a1->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
678 if (mode & S_IXUSR)
679 a2->ae_perm |= ACL_EXECUTE;
680 else
681 a1->ae_perm |= ACL_EXECUTE;
682
683 if (mode & S_IRGRP)
684 a4->ae_perm |= ACL_READ_DATA;
685 else
686 a3->ae_perm |= ACL_READ_DATA;
687 if (mode & S_IWGRP)
688 a4->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
689 else
690 a3->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
691 if (mode & S_IXGRP)
692 a4->ae_perm |= ACL_EXECUTE;
693 else
694 a3->ae_perm |= ACL_EXECUTE;
695
696 if (mode & S_IROTH)
697 a6->ae_perm |= ACL_READ_DATA;
698 else
699 a5->ae_perm |= ACL_READ_DATA;
700 if (mode & S_IWOTH)
701 a6->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
702 else
703 a5->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
704 if (mode & S_IXOTH)
705 a6->ae_perm |= ACL_EXECUTE;
706 else
707 a5->ae_perm |= ACL_EXECUTE;
708 }
709
710 #ifdef _KERNEL
711 void
712 acl_nfs4_sync_acl_from_mode(struct acl *aclp, mode_t mode,
713 int file_owner_id)
714 {
715
716 if (acl_nfs4_old_semantics)
717 acl_nfs4_sync_acl_from_mode_draft(aclp, mode, file_owner_id);
718 else
719 acl_nfs4_trivial_from_mode(aclp, mode);
720 }
721 #endif /* _KERNEL */
722
723 void
724 acl_nfs4_sync_mode_from_acl(mode_t *_mode, const struct acl *aclp)
725 {
726 int i;
727 mode_t old_mode = *_mode, mode = 0, seen = 0;
728 const struct acl_entry *entry;
729
730 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES,
731 ("aclp->acl_cnt <= ACL_MAX_ENTRIES"));
732
733 /*
734 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt
735 *
736 * 3.16.6.1. Recomputing mode upon SETATTR of ACL
737 */
738
739 for (i = 0; i < aclp->acl_cnt; i++) {
740 entry = &(aclp->acl_entry[i]);
741
742 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW &&
743 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY)
744 continue;
745
746 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY)
747 continue;
748
749 if (entry->ae_tag == ACL_USER_OBJ) {
750 if ((entry->ae_perm & ACL_READ_DATA) &&
751 ((seen & S_IRUSR) == 0)) {
752 seen |= S_IRUSR;
753 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
754 mode |= S_IRUSR;
755 }
756 if ((entry->ae_perm & ACL_WRITE_DATA) &&
757 ((seen & S_IWUSR) == 0)) {
758 seen |= S_IWUSR;
759 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
760 mode |= S_IWUSR;
761 }
762 if ((entry->ae_perm & ACL_EXECUTE) &&
763 ((seen & S_IXUSR) == 0)) {
764 seen |= S_IXUSR;
765 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
766 mode |= S_IXUSR;
767 }
768 } else if (entry->ae_tag == ACL_GROUP_OBJ) {
769 if ((entry->ae_perm & ACL_READ_DATA) &&
770 ((seen & S_IRGRP) == 0)) {
771 seen |= S_IRGRP;
772 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
773 mode |= S_IRGRP;
774 }
775 if ((entry->ae_perm & ACL_WRITE_DATA) &&
776 ((seen & S_IWGRP) == 0)) {
777 seen |= S_IWGRP;
778 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
779 mode |= S_IWGRP;
780 }
781 if ((entry->ae_perm & ACL_EXECUTE) &&
782 ((seen & S_IXGRP) == 0)) {
783 seen |= S_IXGRP;
784 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
785 mode |= S_IXGRP;
786 }
787 } else if (entry->ae_tag == ACL_EVERYONE) {
788 if (entry->ae_perm & ACL_READ_DATA) {
789 if ((seen & S_IRUSR) == 0) {
790 seen |= S_IRUSR;
791 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
792 mode |= S_IRUSR;
793 }
794 if ((seen & S_IRGRP) == 0) {
795 seen |= S_IRGRP;
796 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
797 mode |= S_IRGRP;
798 }
799 if ((seen & S_IROTH) == 0) {
800 seen |= S_IROTH;
801 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
802 mode |= S_IROTH;
803 }
804 }
805 if (entry->ae_perm & ACL_WRITE_DATA) {
806 if ((seen & S_IWUSR) == 0) {
807 seen |= S_IWUSR;
808 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
809 mode |= S_IWUSR;
810 }
811 if ((seen & S_IWGRP) == 0) {
812 seen |= S_IWGRP;
813 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
814 mode |= S_IWGRP;
815 }
816 if ((seen & S_IWOTH) == 0) {
817 seen |= S_IWOTH;
818 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
819 mode |= S_IWOTH;
820 }
821 }
822 if (entry->ae_perm & ACL_EXECUTE) {
823 if ((seen & S_IXUSR) == 0) {
824 seen |= S_IXUSR;
825 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
826 mode |= S_IXUSR;
827 }
828 if ((seen & S_IXGRP) == 0) {
829 seen |= S_IXGRP;
830 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
831 mode |= S_IXGRP;
832 }
833 if ((seen & S_IXOTH) == 0) {
834 seen |= S_IXOTH;
835 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
836 mode |= S_IXOTH;
837 }
838 }
839 }
840 }
841
842 *_mode = mode | (old_mode & ACL_PRESERVE_MASK);
843 }
844
845 #ifdef _KERNEL
846 /*
847 * Calculate inherited ACL in a manner compatible with NFSv4 Minor Version 1,
848 * draft-ietf-nfsv4-minorversion1-03.txt.
849 */
850 static void
851 acl_nfs4_compute_inherited_acl_draft(const struct acl *parent_aclp,
852 struct acl *child_aclp, mode_t mode, int file_owner_id,
853 int is_directory)
854 {
855 int i, flags;
856 const struct acl_entry *parent_entry;
857 struct acl_entry *entry, *copy;
858
859 KASSERT(child_aclp->acl_cnt == 0, ("child_aclp->acl_cnt == 0"));
860 KASSERT(parent_aclp->acl_cnt <= ACL_MAX_ENTRIES,
861 ("parent_aclp->acl_cnt <= ACL_MAX_ENTRIES"));
862
863 /*
864 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt
865 *
866 * 3.16.6.2. Applying the mode given to CREATE or OPEN
867 * to an inherited ACL
868 */
869
870 /*
871 * 1. Form an ACL that is the concatenation of all inheritable ACEs.
872 */
873 for (i = 0; i < parent_aclp->acl_cnt; i++) {
874 parent_entry = &(parent_aclp->acl_entry[i]);
875 flags = parent_entry->ae_flags;
876
877 /*
878 * Entry is not inheritable at all.
879 */
880 if ((flags & (ACL_ENTRY_DIRECTORY_INHERIT |
881 ACL_ENTRY_FILE_INHERIT)) == 0)
882 continue;
883
884 /*
885 * We're creating a file, but entry is not inheritable
886 * by files.
887 */
888 if (!is_directory && (flags & ACL_ENTRY_FILE_INHERIT) == 0)
889 continue;
890
891 /*
892 * Entry is inheritable only by files, but has NO_PROPAGATE
893 * flag set, and we're creating a directory, so it wouldn't
894 * propagate to any file in that directory anyway.
895 */
896 if (is_directory &&
897 (flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0 &&
898 (flags & ACL_ENTRY_NO_PROPAGATE_INHERIT))
899 continue;
900
901 KASSERT(child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES,
902 ("child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES"));
903 child_aclp->acl_entry[child_aclp->acl_cnt] = *parent_entry;
904 child_aclp->acl_cnt++;
905 }
906
907 /*
908 * 2. For each entry in the new ACL, adjust its flags, possibly
909 * creating two entries in place of one.
910 */
911 for (i = 0; i < child_aclp->acl_cnt; i++) {
912 entry = &(child_aclp->acl_entry[i]);
913
914 /*
915 * This is not in the specification, but SunOS
916 * apparently does that.
917 */
918 if (((entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT) ||
919 !is_directory) &&
920 entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
921 entry->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER);
922
923 /*
924 * 2.A. If the ACL_ENTRY_NO_PROPAGATE_INHERIT is set, or if the object
925 * being created is not a directory, then clear the
926 * following flags: ACL_ENTRY_NO_PROPAGATE_INHERIT,
927 * ACL_ENTRY_FILE_INHERIT, ACL_ENTRY_DIRECTORY_INHERIT,
928 * ACL_ENTRY_INHERIT_ONLY.
929 */
930 if (entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT ||
931 !is_directory) {
932 entry->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT |
933 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT |
934 ACL_ENTRY_INHERIT_ONLY);
935
936 /*
937 * Continue on to the next ACE.
938 */
939 continue;
940 }
941
942 /*
943 * 2.B. If the object is a directory and ACL_ENTRY_FILE_INHERIT
944 * is set, but ACL_ENTRY_NO_PROPAGATE_INHERIT is not set, ensure
945 * that ACL_ENTRY_INHERIT_ONLY is set. Continue to the
946 * next ACE. Otherwise...
947 */
948 /*
949 * XXX: Read it again and make sure what does the "otherwise"
950 * apply to.
951 */
952 if (is_directory &&
953 (entry->ae_flags & ACL_ENTRY_FILE_INHERIT) &&
954 ((entry->ae_flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0)) {
955 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY;
956 continue;
957 }
958
959 /*
960 * 2.C. If the type of the ACE is neither ALLOW nor deny,
961 * then continue.
962 */
963 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW &&
964 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY)
965 continue;
966
967 /*
968 * 2.D. Copy the original ACE into a second, adjacent ACE.
969 */
970 copy = _acl_duplicate_entry(child_aclp, i);
971
972 /*
973 * 2.E. On the first ACE, ensure that ACL_ENTRY_INHERIT_ONLY
974 * is set.
975 */
976 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY;
977
978 /*
979 * 2.F. On the second ACE, clear the following flags:
980 * ACL_ENTRY_NO_PROPAGATE_INHERIT, ACL_ENTRY_FILE_INHERIT,
981 * ACL_ENTRY_DIRECTORY_INHERIT, ACL_ENTRY_INHERIT_ONLY.
982 */
983 copy->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT |
984 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT |
985 ACL_ENTRY_INHERIT_ONLY);
986
987 /*
988 * 2.G. On the second ACE, if the type is ALLOW,
989 * an implementation MAY clear the following
990 * mask bits: ACL_WRITE_ACL, ACL_WRITE_OWNER.
991 */
992 if (copy->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
993 copy->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER);
994
995 /*
996 * Increment the counter to skip the copied entry.
997 */
998 i++;
999 }
1000
1001 /*
1002 * 3. To ensure that the mode is honored, apply the algorithm describe
1003 * in Section 2.16.6.3, using the mode that is to be used for file
1004 * creation.
1005 */
1006 acl_nfs4_sync_acl_from_mode(child_aclp, mode, file_owner_id);
1007 }
1008 #endif /* _KERNEL */
1009
1010 /*
1011 * Populate the ACL with entries inherited from parent_aclp.
1012 */
1013 static void
1014 acl_nfs4_inherit_entries(const struct acl *parent_aclp,
1015 struct acl *child_aclp, mode_t mode, int file_owner_id,
1016 int is_directory)
1017 {
1018 int i, flags, tag;
1019 const struct acl_entry *parent_entry;
1020 struct acl_entry *entry;
1021
1022 KASSERT(parent_aclp->acl_cnt <= ACL_MAX_ENTRIES,
1023 ("parent_aclp->acl_cnt <= ACL_MAX_ENTRIES"));
1024
1025 for (i = 0; i < parent_aclp->acl_cnt; i++) {
1026 parent_entry = &(parent_aclp->acl_entry[i]);
1027 flags = parent_entry->ae_flags;
1028 tag = parent_entry->ae_tag;
1029
1030 /*
1031 * Don't inherit owner@, group@, or everyone@ entries.
1032 */
1033 if (tag == ACL_USER_OBJ || tag == ACL_GROUP_OBJ ||
1034 tag == ACL_EVERYONE)
1035 continue;
1036
1037 /*
1038 * Entry is not inheritable at all.
1039 */
1040 if ((flags & (ACL_ENTRY_DIRECTORY_INHERIT |
1041 ACL_ENTRY_FILE_INHERIT)) == 0)
1042 continue;
1043
1044 /*
1045 * We're creating a file, but entry is not inheritable
1046 * by files.
1047 */
1048 if (!is_directory && (flags & ACL_ENTRY_FILE_INHERIT) == 0)
1049 continue;
1050
1051 /*
1052 * Entry is inheritable only by files, but has NO_PROPAGATE
1053 * flag set, and we're creating a directory, so it wouldn't
1054 * propagate to any file in that directory anyway.
1055 */
1056 if (is_directory &&
1057 (flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0 &&
1058 (flags & ACL_ENTRY_NO_PROPAGATE_INHERIT))
1059 continue;
1060
1061 /*
1062 * Entry qualifies for being inherited.
1063 */
1064 KASSERT(child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES,
1065 ("child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES"));
1066 entry = &(child_aclp->acl_entry[child_aclp->acl_cnt]);
1067 *entry = *parent_entry;
1068 child_aclp->acl_cnt++;
1069
1070 entry->ae_flags &= ~ACL_ENTRY_INHERIT_ONLY;
1071
1072 /*
1073 * If the type of the ACE is neither ALLOW nor DENY,
1074 * then leave it as it is and proceed to the next one.
1075 */
1076 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW &&
1077 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY)
1078 continue;
1079
1080 /*
1081 * If the ACL_ENTRY_NO_PROPAGATE_INHERIT is set, or if
1082 * the object being created is not a directory, then clear
1083 * the following flags: ACL_ENTRY_NO_PROPAGATE_INHERIT,
1084 * ACL_ENTRY_FILE_INHERIT, ACL_ENTRY_DIRECTORY_INHERIT,
1085 * ACL_ENTRY_INHERIT_ONLY.
1086 */
1087 if (entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT ||
1088 !is_directory) {
1089 entry->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT |
1090 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT |
1091 ACL_ENTRY_INHERIT_ONLY);
1092 }
1093
1094 /*
1095 * If the object is a directory and ACL_ENTRY_FILE_INHERIT
1096 * is set, but ACL_ENTRY_DIRECTORY_INHERIT is not set, ensure
1097 * that ACL_ENTRY_INHERIT_ONLY is set.
1098 */
1099 if (is_directory &&
1100 (entry->ae_flags & ACL_ENTRY_FILE_INHERIT) &&
1101 ((entry->ae_flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0)) {
1102 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY;
1103 }
1104
1105 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW &&
1106 (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) == 0) {
1107 /*
1108 * Some permissions must never be inherited.
1109 */
1110 entry->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER |
1111 ACL_WRITE_NAMED_ATTRS | ACL_WRITE_ATTRIBUTES);
1112
1113 /*
1114 * Others must be masked according to the file mode.
1115 */
1116 if ((mode & S_IRGRP) == 0)
1117 entry->ae_perm &= ~ACL_READ_DATA;
1118 if ((mode & S_IWGRP) == 0)
1119 entry->ae_perm &=
1120 ~(ACL_WRITE_DATA | ACL_APPEND_DATA);
1121 if ((mode & S_IXGRP) == 0)
1122 entry->ae_perm &= ~ACL_EXECUTE;
1123 }
1124 }
1125 }
1126
1127 /*
1128 * Calculate inherited ACL in a manner compatible with PSARC/2010/029.
1129 * It's also being used to calculate a trivial ACL, by inheriting from
1130 * a NULL ACL.
1131 */
1132 static void
1133 acl_nfs4_compute_inherited_acl_psarc(const struct acl *parent_aclp,
1134 struct acl *aclp, mode_t mode, int file_owner_id, int is_directory)
1135 {
1136 acl_perm_t user_allow_first = 0, user_deny = 0, group_deny = 0;
1137 acl_perm_t user_allow, group_allow, everyone_allow;
1138
1139 KASSERT(aclp->acl_cnt == 0, ("aclp->acl_cnt == 0"));
1140
1141 user_allow = group_allow = everyone_allow = ACL_READ_ACL |
1142 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | ACL_SYNCHRONIZE;
1143 user_allow |= ACL_WRITE_ACL | ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES |
1144 ACL_WRITE_NAMED_ATTRS;
1145
1146 if (mode & S_IRUSR)
1147 user_allow |= ACL_READ_DATA;
1148 if (mode & S_IWUSR)
1149 user_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
1150 if (mode & S_IXUSR)
1151 user_allow |= ACL_EXECUTE;
1152
1153 if (mode & S_IRGRP)
1154 group_allow |= ACL_READ_DATA;
1155 if (mode & S_IWGRP)
1156 group_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
1157 if (mode & S_IXGRP)
1158 group_allow |= ACL_EXECUTE;
1159
1160 if (mode & S_IROTH)
1161 everyone_allow |= ACL_READ_DATA;
1162 if (mode & S_IWOTH)
1163 everyone_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
1164 if (mode & S_IXOTH)
1165 everyone_allow |= ACL_EXECUTE;
1166
1167 user_deny = ((group_allow | everyone_allow) & ~user_allow);
1168 group_deny = everyone_allow & ~group_allow;
1169 user_allow_first = group_deny & ~user_deny;
1170
1171 if (user_allow_first != 0)
1172 _acl_append(aclp, ACL_USER_OBJ, user_allow_first,
1173 ACL_ENTRY_TYPE_ALLOW);
1174 if (user_deny != 0)
1175 _acl_append(aclp, ACL_USER_OBJ, user_deny,
1176 ACL_ENTRY_TYPE_DENY);
1177 if (group_deny != 0)
1178 _acl_append(aclp, ACL_GROUP_OBJ, group_deny,
1179 ACL_ENTRY_TYPE_DENY);
1180
1181 if (parent_aclp != NULL)
1182 acl_nfs4_inherit_entries(parent_aclp, aclp, mode,
1183 file_owner_id, is_directory);
1184
1185 _acl_append(aclp, ACL_USER_OBJ, user_allow, ACL_ENTRY_TYPE_ALLOW);
1186 _acl_append(aclp, ACL_GROUP_OBJ, group_allow, ACL_ENTRY_TYPE_ALLOW);
1187 _acl_append(aclp, ACL_EVERYONE, everyone_allow, ACL_ENTRY_TYPE_ALLOW);
1188 }
1189
1190 #ifdef _KERNEL
1191 void
1192 acl_nfs4_compute_inherited_acl(const struct acl *parent_aclp,
1193 struct acl *child_aclp, mode_t mode, int file_owner_id,
1194 int is_directory)
1195 {
1196
1197 if (acl_nfs4_old_semantics)
1198 acl_nfs4_compute_inherited_acl_draft(parent_aclp, child_aclp,
1199 mode, file_owner_id, is_directory);
1200 else
1201 acl_nfs4_compute_inherited_acl_psarc(parent_aclp, child_aclp,
1202 mode, file_owner_id, is_directory);
1203 }
1204 #endif /* _KERNEL */
1205
1206 /*
1207 * Calculate trivial ACL in a manner compatible with PSARC/2010/029.
1208 * Note that this results in an ACL different from (but semantically
1209 * equal to) the "canonical six" trivial ACL computed using algorithm
1210 * described in draft-ietf-nfsv4-minorversion1-03.txt, 3.16.6.2.
1211 */
1212 static void
1213 acl_nfs4_trivial_from_mode(struct acl *aclp, mode_t mode)
1214 {
1215
1216 aclp->acl_cnt = 0;
1217 acl_nfs4_compute_inherited_acl_psarc(NULL, aclp, mode, -1, -1);
1218 }
1219
1220 #ifndef _KERNEL
1221 /*
1222 * This routine is used by libc to implement acl_strip_np(3)
1223 * and acl_is_trivial_np(3).
1224 */
1225 void
1226 acl_nfs4_trivial_from_mode_libc(struct acl *aclp, int mode, int canonical_six)
1227 {
1228
1229 aclp->acl_cnt = 0;
1230 if (canonical_six)
1231 acl_nfs4_sync_acl_from_mode_draft(aclp, mode, -1);
1232 else
1233 acl_nfs4_trivial_from_mode(aclp, mode);
1234 }
1235 #endif /* !_KERNEL */
1236
1237 #ifdef _KERNEL
1238 static int
1239 _acls_are_equal(const struct acl *a, const struct acl *b)
1240 {
1241 int i;
1242 const struct acl_entry *entrya, *entryb;
1243
1244 if (a->acl_cnt != b->acl_cnt)
1245 return (0);
1246
1247 for (i = 0; i < b->acl_cnt; i++) {
1248 entrya = &(a->acl_entry[i]);
1249 entryb = &(b->acl_entry[i]);
1250
1251 if (entrya->ae_tag != entryb->ae_tag ||
1252 entrya->ae_id != entryb->ae_id ||
1253 entrya->ae_perm != entryb->ae_perm ||
1254 entrya->ae_entry_type != entryb->ae_entry_type ||
1255 entrya->ae_flags != entryb->ae_flags)
1256 return (0);
1257 }
1258
1259 return (1);
1260 }
1261
1262 /*
1263 * This routine is used to determine whether to remove extended attribute
1264 * that stores ACL contents.
1265 */
1266 int
1267 acl_nfs4_is_trivial(const struct acl *aclp, int file_owner_id)
1268 {
1269 int trivial;
1270 mode_t tmpmode = 0;
1271 struct acl *tmpaclp;
1272
1273 if (aclp->acl_cnt > 6)
1274 return (0);
1275
1276 /*
1277 * Compute the mode from the ACL, then compute new ACL from that mode.
1278 * If the ACLs are identical, then the ACL is trivial.
1279 *
1280 * XXX: I guess there is a faster way to do this. However, even
1281 * this slow implementation significantly speeds things up
1282 * for files that don't have non-trivial ACLs - it's critical
1283 * for performance to not use EA when they are not needed.
1284 *
1285 * First try the PSARC/2010/029 semantics.
1286 */
1287 tmpaclp = acl_alloc(M_WAITOK | M_ZERO);
1288 acl_nfs4_sync_mode_from_acl(&tmpmode, aclp);
1289 acl_nfs4_trivial_from_mode(tmpaclp, tmpmode);
1290 trivial = _acls_are_equal(aclp, tmpaclp);
1291 if (trivial) {
1292 acl_free(tmpaclp);
1293 return (trivial);
1294 }
1295
1296 /*
1297 * Check if it's a draft-ietf-nfsv4-minorversion1-03.txt trivial ACL.
1298 */
1299 tmpaclp->acl_cnt = 0;
1300 acl_nfs4_sync_acl_from_mode_draft(tmpaclp, tmpmode, file_owner_id);
1301 trivial = _acls_are_equal(aclp, tmpaclp);
1302 acl_free(tmpaclp);
1303
1304 return (trivial);
1305 }
1306 #endif /* _KERNEL */
1307
1308 int
1309 acl_nfs4_check(const struct acl *aclp, int is_directory)
1310 {
1311 int i;
1312 const struct acl_entry *entry;
1313
1314 /*
1315 * The spec doesn't seem to say anything about ACL validity.
1316 * It seems there is not much to do here. There is even no need
1317 * to count "owner@" or "everyone@" (ACL_USER_OBJ and ACL_EVERYONE)
1318 * entries, as there can be several of them and that's perfectly
1319 * valid. There can be none of them too. Really.
1320 */
1321
1322 if (aclp->acl_cnt > ACL_MAX_ENTRIES || aclp->acl_cnt <= 0)
1323 return (EINVAL);
1324
1325 for (i = 0; i < aclp->acl_cnt; i++) {
1326 entry = &(aclp->acl_entry[i]);
1327
1328 switch (entry->ae_tag) {
1329 case ACL_USER_OBJ:
1330 case ACL_GROUP_OBJ:
1331 case ACL_EVERYONE:
1332 if (entry->ae_id != ACL_UNDEFINED_ID)
1333 return (EINVAL);
1334 break;
1335
1336 case ACL_USER:
1337 case ACL_GROUP:
1338 if (entry->ae_id == ACL_UNDEFINED_ID)
1339 return (EINVAL);
1340 break;
1341
1342 default:
1343 return (EINVAL);
1344 }
1345
1346 if ((entry->ae_perm | ACL_NFS4_PERM_BITS) != ACL_NFS4_PERM_BITS)
1347 return (EINVAL);
1348
1349 /*
1350 * Disallow ACL_ENTRY_TYPE_AUDIT and ACL_ENTRY_TYPE_ALARM for now.
1351 */
1352 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW &&
1353 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY)
1354 return (EINVAL);
1355
1356 if ((entry->ae_flags | ACL_FLAGS_BITS) != ACL_FLAGS_BITS)
1357 return (EINVAL);
1358
1359 /* Disallow unimplemented flags. */
1360 if (entry->ae_flags & (ACL_ENTRY_SUCCESSFUL_ACCESS |
1361 ACL_ENTRY_FAILED_ACCESS))
1362 return (EINVAL);
1363
1364 /* Disallow flags not allowed for ordinary files. */
1365 if (!is_directory) {
1366 if (entry->ae_flags & (ACL_ENTRY_FILE_INHERIT |
1367 ACL_ENTRY_DIRECTORY_INHERIT |
1368 ACL_ENTRY_NO_PROPAGATE_INHERIT | ACL_ENTRY_INHERIT_ONLY))
1369 return (EINVAL);
1370 }
1371 }
1372
1373 return (0);
1374 }
1375
1376 #ifdef _KERNEL
1377 static int
1378 acl_nfs4_modload(module_t module, int what, void *arg)
1379 {
1380 int ret;
1381
1382 ret = 0;
1383
1384 switch (what) {
1385 case MOD_LOAD:
1386 case MOD_SHUTDOWN:
1387 break;
1388
1389 case MOD_QUIESCE:
1390 /* XXX TODO */
1391 ret = 0;
1392 break;
1393
1394 case MOD_UNLOAD:
1395 /* XXX TODO */
1396 ret = 0;
1397 break;
1398 default:
1399 ret = EINVAL;
1400 break;
1401 }
1402
1403 return (ret);
1404 }
1405
1406 static moduledata_t acl_nfs4_mod = {
1407 "acl_nfs4",
1408 acl_nfs4_modload,
1409 NULL
1410 };
1411
1412 /*
1413 * XXX TODO: which subsystem, order?
1414 */
1415 DECLARE_MODULE(acl_nfs4, acl_nfs4_mod, SI_SUB_VFS, SI_ORDER_FIRST);
1416 MODULE_VERSION(acl_nfs4, 1);
1417 #endif /* _KERNEL */
Cache object: 54afdd299c9dd7ec546e549f710c8c19
|