1 /*-
2 * Copyright (c) 2008-2010 Edward Tomasz Napierała <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: stable/9/sys/kern/subr_acl_nfs4.c 235890 2012-05-24 10:02:42Z trasz $");
36
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/mount.h>
40 #include <sys/priv.h>
41 #include <sys/vnode.h>
42 #include <sys/errno.h>
43 #include <sys/stat.h>
44 #include <sys/sysctl.h>
45 #include <sys/acl.h>
46 #else
47 #include <errno.h>
48 #include <assert.h>
49 #include <sys/acl.h>
50 #include <sys/stat.h>
51 #define KASSERT(a, b) assert(a)
52 #define CTASSERT(a)
53
54 #endif /* !_KERNEL */
55
56 #ifdef _KERNEL
57
58 static void acl_nfs4_trivial_from_mode(struct acl *aclp, mode_t mode);
59
60 static int acl_nfs4_old_semantics = 0;
61
62 SYSCTL_INT(_vfs, OID_AUTO, acl_nfs4_old_semantics, CTLFLAG_RW,
63 &acl_nfs4_old_semantics, 0, "Use pre-PSARC/2010/029 NFSv4 ACL semantics");
64
65 static struct {
66 accmode_t accmode;
67 int mask;
68 } accmode2mask[] = {{VREAD, ACL_READ_DATA},
69 {VWRITE, ACL_WRITE_DATA},
70 {VAPPEND, ACL_APPEND_DATA},
71 {VEXEC, ACL_EXECUTE},
72 {VREAD_NAMED_ATTRS, ACL_READ_NAMED_ATTRS},
73 {VWRITE_NAMED_ATTRS, ACL_WRITE_NAMED_ATTRS},
74 {VDELETE_CHILD, ACL_DELETE_CHILD},
75 {VREAD_ATTRIBUTES, ACL_READ_ATTRIBUTES},
76 {VWRITE_ATTRIBUTES, ACL_WRITE_ATTRIBUTES},
77 {VDELETE, ACL_DELETE},
78 {VREAD_ACL, ACL_READ_ACL},
79 {VWRITE_ACL, ACL_WRITE_ACL},
80 {VWRITE_OWNER, ACL_WRITE_OWNER},
81 {VSYNCHRONIZE, ACL_SYNCHRONIZE},
82 {0, 0}};
83
84 static int
_access_mask_from_accmode(accmode_t accmode)85 _access_mask_from_accmode(accmode_t accmode)
86 {
87 int access_mask = 0, i;
88
89 for (i = 0; accmode2mask[i].accmode != 0; i++) {
90 if (accmode & accmode2mask[i].accmode)
91 access_mask |= accmode2mask[i].mask;
92 }
93
94 /*
95 * VAPPEND is just a modifier for VWRITE; if the caller asked
96 * for 'VAPPEND | VWRITE', we want to check for ACL_APPEND_DATA only.
97 */
98 if (access_mask & ACL_APPEND_DATA)
99 access_mask &= ~ACL_WRITE_DATA;
100
101 return (access_mask);
102 }
103
104 /*
105 * Return 0, iff access is allowed, 1 otherwise.
106 */
107 static int
_acl_denies(const struct acl * aclp,int access_mask,struct ucred * cred,int file_uid,int file_gid,int * denied_explicitly)108 _acl_denies(const struct acl *aclp, int access_mask, struct ucred *cred,
109 int file_uid, int file_gid, int *denied_explicitly)
110 {
111 int i;
112 const struct acl_entry *entry;
113
114 if (denied_explicitly != NULL)
115 *denied_explicitly = 0;
116
117 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES,
118 ("aclp->acl_cnt <= ACL_MAX_ENTRIES"));
119
120 for (i = 0; i < aclp->acl_cnt; i++) {
121 entry = &(aclp->acl_entry[i]);
122
123 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW &&
124 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY)
125 continue;
126 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY)
127 continue;
128 switch (entry->ae_tag) {
129 case ACL_USER_OBJ:
130 if (file_uid != cred->cr_uid)
131 continue;
132 break;
133 case ACL_USER:
134 if (entry->ae_id != cred->cr_uid)
135 continue;
136 break;
137 case ACL_GROUP_OBJ:
138 if (!groupmember(file_gid, cred))
139 continue;
140 break;
141 case ACL_GROUP:
142 if (!groupmember(entry->ae_id, cred))
143 continue;
144 break;
145 default:
146 KASSERT(entry->ae_tag == ACL_EVERYONE,
147 ("entry->ae_tag == ACL_EVERYONE"));
148 }
149
150 if (entry->ae_entry_type == ACL_ENTRY_TYPE_DENY) {
151 if (entry->ae_perm & access_mask) {
152 if (denied_explicitly != NULL)
153 *denied_explicitly = 1;
154 return (1);
155 }
156 }
157
158 access_mask &= ~(entry->ae_perm);
159 if (access_mask == 0)
160 return (0);
161 }
162
163 if (access_mask == 0)
164 return (0);
165
166 return (1);
167 }
168
169 int
vaccess_acl_nfs4(enum vtype type,uid_t file_uid,gid_t file_gid,struct acl * aclp,accmode_t accmode,struct ucred * cred,int * privused)170 vaccess_acl_nfs4(enum vtype type, uid_t file_uid, gid_t file_gid,
171 struct acl *aclp, accmode_t accmode, struct ucred *cred, int *privused)
172 {
173 accmode_t priv_granted = 0;
174 int denied, explicitly_denied, access_mask, is_directory,
175 must_be_owner = 0;
176 mode_t file_mode = 0;
177
178 KASSERT((accmode & ~(VEXEC | VWRITE | VREAD | VADMIN | VAPPEND |
179 VEXPLICIT_DENY | VREAD_NAMED_ATTRS | VWRITE_NAMED_ATTRS |
180 VDELETE_CHILD | VREAD_ATTRIBUTES | VWRITE_ATTRIBUTES | VDELETE |
181 VREAD_ACL | VWRITE_ACL | VWRITE_OWNER | VSYNCHRONIZE)) == 0,
182 ("invalid bit in accmode"));
183 KASSERT((accmode & VAPPEND) == 0 || (accmode & VWRITE),
184 ("VAPPEND without VWRITE"));
185
186 if (privused != NULL)
187 *privused = 0;
188
189 if (accmode & VADMIN)
190 must_be_owner = 1;
191
192 /*
193 * Ignore VSYNCHRONIZE permission.
194 */
195 accmode &= ~VSYNCHRONIZE;
196
197 access_mask = _access_mask_from_accmode(accmode);
198
199 if (type == VDIR)
200 is_directory = 1;
201 else
202 is_directory = 0;
203
204 /*
205 * File owner is always allowed to read and write the ACL
206 * and basic attributes. This is to prevent a situation
207 * where user would change ACL in a way that prevents him
208 * from undoing the change.
209 */
210 if (file_uid == cred->cr_uid)
211 access_mask &= ~(ACL_READ_ACL | ACL_WRITE_ACL |
212 ACL_READ_ATTRIBUTES | ACL_WRITE_ATTRIBUTES);
213
214 /*
215 * Ignore append permission for regular files; use write
216 * permission instead.
217 */
218 if (!is_directory && (access_mask & ACL_APPEND_DATA)) {
219 access_mask &= ~ACL_APPEND_DATA;
220 access_mask |= ACL_WRITE_DATA;
221 }
222
223 denied = _acl_denies(aclp, access_mask, cred, file_uid, file_gid,
224 &explicitly_denied);
225
226 if (must_be_owner) {
227 if (file_uid != cred->cr_uid)
228 denied = EPERM;
229 }
230
231 /*
232 * For VEXEC, ensure that at least one execute bit is set for
233 * non-directories. We have to check the mode here to stay
234 * consistent with execve(2). See the test in
235 * exec_check_permissions().
236 */
237 acl_nfs4_sync_mode_from_acl(&file_mode, aclp);
238 if (!denied && !is_directory && (accmode & VEXEC) &&
239 (file_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) == 0)
240 denied = EACCES;
241
242 if (!denied)
243 return (0);
244
245 /*
246 * Access failed. Iff it was not denied explicitly and
247 * VEXPLICIT_DENY flag was specified, allow access.
248 */
249 if ((accmode & VEXPLICIT_DENY) && explicitly_denied == 0)
250 return (0);
251
252 accmode &= ~VEXPLICIT_DENY;
253
254 /*
255 * No match. Try to use privileges, if there are any.
256 */
257 if (is_directory) {
258 if ((accmode & VEXEC) && !priv_check_cred(cred,
259 PRIV_VFS_LOOKUP, 0))
260 priv_granted |= VEXEC;
261 } else {
262 /*
263 * Ensure that at least one execute bit is on. Otherwise,
264 * a privileged user will always succeed, and we don't want
265 * this to happen unless the file really is executable.
266 */
267 if ((accmode & VEXEC) && (file_mode &
268 (S_IXUSR | S_IXGRP | S_IXOTH)) != 0 &&
269 !priv_check_cred(cred, PRIV_VFS_EXEC, 0))
270 priv_granted |= VEXEC;
271 }
272
273 if ((accmode & VREAD) && !priv_check_cred(cred, PRIV_VFS_READ, 0))
274 priv_granted |= VREAD;
275
276 if ((accmode & (VWRITE | VAPPEND | VDELETE_CHILD)) &&
277 !priv_check_cred(cred, PRIV_VFS_WRITE, 0))
278 priv_granted |= (VWRITE | VAPPEND | VDELETE_CHILD);
279
280 if ((accmode & VADMIN_PERMS) &&
281 !priv_check_cred(cred, PRIV_VFS_ADMIN, 0))
282 priv_granted |= VADMIN_PERMS;
283
284 if ((accmode & VSTAT_PERMS) &&
285 !priv_check_cred(cred, PRIV_VFS_STAT, 0))
286 priv_granted |= VSTAT_PERMS;
287
288 if ((accmode & priv_granted) == accmode) {
289 if (privused != NULL)
290 *privused = 1;
291
292 return (0);
293 }
294
295 if (accmode & (VADMIN_PERMS | VDELETE_CHILD | VDELETE))
296 denied = EPERM;
297 else
298 denied = EACCES;
299
300 return (denied);
301 }
302 #endif /* _KERNEL */
303
304 static int
_acl_entry_matches(struct acl_entry * entry,acl_tag_t tag,acl_perm_t perm,acl_entry_type_t entry_type)305 _acl_entry_matches(struct acl_entry *entry, acl_tag_t tag, acl_perm_t perm,
306 acl_entry_type_t entry_type)
307 {
308 if (entry->ae_tag != tag)
309 return (0);
310
311 if (entry->ae_id != ACL_UNDEFINED_ID)
312 return (0);
313
314 if (entry->ae_perm != perm)
315 return (0);
316
317 if (entry->ae_entry_type != entry_type)
318 return (0);
319
320 if (entry->ae_flags != 0)
321 return (0);
322
323 return (1);
324 }
325
326 static struct acl_entry *
_acl_append(struct acl * aclp,acl_tag_t tag,acl_perm_t perm,acl_entry_type_t entry_type)327 _acl_append(struct acl *aclp, acl_tag_t tag, acl_perm_t perm,
328 acl_entry_type_t entry_type)
329 {
330 struct acl_entry *entry;
331
332 KASSERT(aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES,
333 ("aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES"));
334
335 entry = &(aclp->acl_entry[aclp->acl_cnt]);
336 aclp->acl_cnt++;
337
338 entry->ae_tag = tag;
339 entry->ae_id = ACL_UNDEFINED_ID;
340 entry->ae_perm = perm;
341 entry->ae_entry_type = entry_type;
342 entry->ae_flags = 0;
343
344 return (entry);
345 }
346
347 static struct acl_entry *
_acl_duplicate_entry(struct acl * aclp,int entry_index)348 _acl_duplicate_entry(struct acl *aclp, int entry_index)
349 {
350 int i;
351
352 KASSERT(aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES,
353 ("aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES"));
354
355 for (i = aclp->acl_cnt; i > entry_index; i--)
356 aclp->acl_entry[i] = aclp->acl_entry[i - 1];
357
358 aclp->acl_cnt++;
359
360 return (&(aclp->acl_entry[entry_index + 1]));
361 }
362
363 static void
acl_nfs4_sync_acl_from_mode_draft(struct acl * aclp,mode_t mode,int file_owner_id)364 acl_nfs4_sync_acl_from_mode_draft(struct acl *aclp, mode_t mode,
365 int file_owner_id)
366 {
367 int i, meets, must_append;
368 struct acl_entry *entry, *copy, *previous,
369 *a1, *a2, *a3, *a4, *a5, *a6;
370 mode_t amode;
371 const int READ = 04;
372 const int WRITE = 02;
373 const int EXEC = 01;
374
375 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES,
376 ("aclp->acl_cnt <= ACL_MAX_ENTRIES"));
377
378 /*
379 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt
380 *
381 * 3.16.6.3. Applying a Mode to an Existing ACL
382 */
383
384 /*
385 * 1. For each ACE:
386 */
387 for (i = 0; i < aclp->acl_cnt; i++) {
388 entry = &(aclp->acl_entry[i]);
389
390 /*
391 * 1.1. If the type is neither ALLOW or DENY - skip.
392 */
393 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW &&
394 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY)
395 continue;
396
397 /*
398 * 1.2. If ACL_ENTRY_INHERIT_ONLY is set - skip.
399 */
400 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY)
401 continue;
402
403 /*
404 * 1.3. If ACL_ENTRY_FILE_INHERIT or ACL_ENTRY_DIRECTORY_INHERIT
405 * are set:
406 */
407 if (entry->ae_flags &
408 (ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT)) {
409 /*
410 * 1.3.1. A copy of the current ACE is made, and placed
411 * in the ACL immediately following the current
412 * ACE.
413 */
414 copy = _acl_duplicate_entry(aclp, i);
415
416 /*
417 * 1.3.2. In the first ACE, the flag
418 * ACL_ENTRY_INHERIT_ONLY is set.
419 */
420 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY;
421
422 /*
423 * 1.3.3. In the second ACE, the following flags
424 * are cleared:
425 * ACL_ENTRY_FILE_INHERIT,
426 * ACL_ENTRY_DIRECTORY_INHERIT,
427 * ACL_ENTRY_NO_PROPAGATE_INHERIT.
428 */
429 copy->ae_flags &= ~(ACL_ENTRY_FILE_INHERIT |
430 ACL_ENTRY_DIRECTORY_INHERIT |
431 ACL_ENTRY_NO_PROPAGATE_INHERIT);
432
433 /*
434 * The algorithm continues on with the second ACE.
435 */
436 i++;
437 entry = copy;
438 }
439
440 /*
441 * 1.4. If it's owner@, group@ or everyone@ entry, clear
442 * ACL_READ_DATA, ACL_WRITE_DATA, ACL_APPEND_DATA
443 * and ACL_EXECUTE. Continue to the next entry.
444 */
445 if (entry->ae_tag == ACL_USER_OBJ ||
446 entry->ae_tag == ACL_GROUP_OBJ ||
447 entry->ae_tag == ACL_EVERYONE) {
448 entry->ae_perm &= ~(ACL_READ_DATA | ACL_WRITE_DATA |
449 ACL_APPEND_DATA | ACL_EXECUTE);
450 continue;
451 }
452
453 /*
454 * 1.5. Otherwise, if the "who" field did not match one
455 * of OWNER@, GROUP@, EVERYONE@:
456 *
457 * 1.5.1. If the type is ALLOW, check the preceding ACE.
458 * If it does not meet all of the following criteria:
459 */
460 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW)
461 continue;
462
463 meets = 0;
464 if (i > 0) {
465 meets = 1;
466 previous = &(aclp->acl_entry[i - 1]);
467
468 /*
469 * 1.5.1.1. The type field is DENY,
470 */
471 if (previous->ae_entry_type != ACL_ENTRY_TYPE_DENY)
472 meets = 0;
473
474 /*
475 * 1.5.1.2. The "who" field is the same as the current
476 * ACE,
477 *
478 * 1.5.1.3. The flag bit ACE4_IDENTIFIER_GROUP
479 * is the same as it is in the current ACE,
480 * and no other flag bits are set,
481 */
482 if (previous->ae_id != entry->ae_id ||
483 previous->ae_tag != entry->ae_tag)
484 meets = 0;
485
486 if (previous->ae_flags)
487 meets = 0;
488
489 /*
490 * 1.5.1.4. The mask bits are a subset of the mask bits
491 * of the current ACE, and are also subset of
492 * the following: ACL_READ_DATA,
493 * ACL_WRITE_DATA, ACL_APPEND_DATA, ACL_EXECUTE
494 */
495 if (previous->ae_perm & ~(entry->ae_perm))
496 meets = 0;
497
498 if (previous->ae_perm & ~(ACL_READ_DATA |
499 ACL_WRITE_DATA | ACL_APPEND_DATA | ACL_EXECUTE))
500 meets = 0;
501 }
502
503 if (!meets) {
504 /*
505 * Then the ACE of type DENY, with a who equal
506 * to the current ACE, flag bits equal to
507 * (<current ACE flags> & <ACE_IDENTIFIER_GROUP>)
508 * and no mask bits, is prepended.
509 */
510 previous = entry;
511 entry = _acl_duplicate_entry(aclp, i);
512
513 /* Adjust counter, as we've just added an entry. */
514 i++;
515
516 previous->ae_tag = entry->ae_tag;
517 previous->ae_id = entry->ae_id;
518 previous->ae_flags = entry->ae_flags;
519 previous->ae_perm = 0;
520 previous->ae_entry_type = ACL_ENTRY_TYPE_DENY;
521 }
522
523 /*
524 * 1.5.2. The following modifications are made to the prepended
525 * ACE. The intent is to mask the following ACE
526 * to disallow ACL_READ_DATA, ACL_WRITE_DATA,
527 * ACL_APPEND_DATA, or ACL_EXECUTE, based upon the group
528 * permissions of the new mode. As a special case,
529 * if the ACE matches the current owner of the file,
530 * the owner bits are used, rather than the group bits.
531 * This is reflected in the algorithm below.
532 */
533 amode = mode >> 3;
534
535 /*
536 * If ACE4_IDENTIFIER_GROUP is not set, and the "who" field
537 * in ACE matches the owner of the file, we shift amode three
538 * more bits, in order to have the owner permission bits
539 * placed in the three low order bits of amode.
540 */
541 if (entry->ae_tag == ACL_USER && entry->ae_id == file_owner_id)
542 amode = amode >> 3;
543
544 if (entry->ae_perm & ACL_READ_DATA) {
545 if (amode & READ)
546 previous->ae_perm &= ~ACL_READ_DATA;
547 else
548 previous->ae_perm |= ACL_READ_DATA;
549 }
550
551 if (entry->ae_perm & ACL_WRITE_DATA) {
552 if (amode & WRITE)
553 previous->ae_perm &= ~ACL_WRITE_DATA;
554 else
555 previous->ae_perm |= ACL_WRITE_DATA;
556 }
557
558 if (entry->ae_perm & ACL_APPEND_DATA) {
559 if (amode & WRITE)
560 previous->ae_perm &= ~ACL_APPEND_DATA;
561 else
562 previous->ae_perm |= ACL_APPEND_DATA;
563 }
564
565 if (entry->ae_perm & ACL_EXECUTE) {
566 if (amode & EXEC)
567 previous->ae_perm &= ~ACL_EXECUTE;
568 else
569 previous->ae_perm |= ACL_EXECUTE;
570 }
571
572 /*
573 * 1.5.3. If ACE4_IDENTIFIER_GROUP is set in the flags
574 * of the ALLOW ace:
575 *
576 * XXX: This point is not there in the Falkner's draft.
577 */
578 if (entry->ae_tag == ACL_GROUP &&
579 entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) {
580 mode_t extramode, ownermode;
581 extramode = (mode >> 3) & 07;
582 ownermode = mode >> 6;
583 extramode &= ~ownermode;
584
585 if (extramode) {
586 if (extramode & READ) {
587 entry->ae_perm &= ~ACL_READ_DATA;
588 previous->ae_perm &= ~ACL_READ_DATA;
589 }
590
591 if (extramode & WRITE) {
592 entry->ae_perm &=
593 ~(ACL_WRITE_DATA | ACL_APPEND_DATA);
594 previous->ae_perm &=
595 ~(ACL_WRITE_DATA | ACL_APPEND_DATA);
596 }
597
598 if (extramode & EXEC) {
599 entry->ae_perm &= ~ACL_EXECUTE;
600 previous->ae_perm &= ~ACL_EXECUTE;
601 }
602 }
603 }
604 }
605
606 /*
607 * 2. If there at least six ACEs, the final six ACEs are examined.
608 * If they are not equal to what we want, append six ACEs.
609 */
610 must_append = 0;
611 if (aclp->acl_cnt < 6) {
612 must_append = 1;
613 } else {
614 a6 = &(aclp->acl_entry[aclp->acl_cnt - 1]);
615 a5 = &(aclp->acl_entry[aclp->acl_cnt - 2]);
616 a4 = &(aclp->acl_entry[aclp->acl_cnt - 3]);
617 a3 = &(aclp->acl_entry[aclp->acl_cnt - 4]);
618 a2 = &(aclp->acl_entry[aclp->acl_cnt - 5]);
619 a1 = &(aclp->acl_entry[aclp->acl_cnt - 6]);
620
621 if (!_acl_entry_matches(a1, ACL_USER_OBJ, 0,
622 ACL_ENTRY_TYPE_DENY))
623 must_append = 1;
624 if (!_acl_entry_matches(a2, ACL_USER_OBJ, ACL_WRITE_ACL |
625 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES |
626 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_ALLOW))
627 must_append = 1;
628 if (!_acl_entry_matches(a3, ACL_GROUP_OBJ, 0,
629 ACL_ENTRY_TYPE_DENY))
630 must_append = 1;
631 if (!_acl_entry_matches(a4, ACL_GROUP_OBJ, 0,
632 ACL_ENTRY_TYPE_ALLOW))
633 must_append = 1;
634 if (!_acl_entry_matches(a5, ACL_EVERYONE, ACL_WRITE_ACL |
635 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES |
636 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_DENY))
637 must_append = 1;
638 if (!_acl_entry_matches(a6, ACL_EVERYONE, ACL_READ_ACL |
639 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS |
640 ACL_SYNCHRONIZE, ACL_ENTRY_TYPE_ALLOW))
641 must_append = 1;
642 }
643
644 if (must_append) {
645 KASSERT(aclp->acl_cnt + 6 <= ACL_MAX_ENTRIES,
646 ("aclp->acl_cnt <= ACL_MAX_ENTRIES"));
647
648 a1 = _acl_append(aclp, ACL_USER_OBJ, 0, ACL_ENTRY_TYPE_DENY);
649 a2 = _acl_append(aclp, ACL_USER_OBJ, ACL_WRITE_ACL |
650 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES |
651 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_ALLOW);
652 a3 = _acl_append(aclp, ACL_GROUP_OBJ, 0, ACL_ENTRY_TYPE_DENY);
653 a4 = _acl_append(aclp, ACL_GROUP_OBJ, 0, ACL_ENTRY_TYPE_ALLOW);
654 a5 = _acl_append(aclp, ACL_EVERYONE, ACL_WRITE_ACL |
655 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES |
656 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_DENY);
657 a6 = _acl_append(aclp, ACL_EVERYONE, ACL_READ_ACL |
658 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS |
659 ACL_SYNCHRONIZE, ACL_ENTRY_TYPE_ALLOW);
660
661 KASSERT(a1 != NULL && a2 != NULL && a3 != NULL && a4 != NULL &&
662 a5 != NULL && a6 != NULL, ("couldn't append to ACL."));
663 }
664
665 /*
666 * 3. The final six ACEs are adjusted according to the incoming mode.
667 */
668 if (mode & S_IRUSR)
669 a2->ae_perm |= ACL_READ_DATA;
670 else
671 a1->ae_perm |= ACL_READ_DATA;
672 if (mode & S_IWUSR)
673 a2->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
674 else
675 a1->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
676 if (mode & S_IXUSR)
677 a2->ae_perm |= ACL_EXECUTE;
678 else
679 a1->ae_perm |= ACL_EXECUTE;
680
681 if (mode & S_IRGRP)
682 a4->ae_perm |= ACL_READ_DATA;
683 else
684 a3->ae_perm |= ACL_READ_DATA;
685 if (mode & S_IWGRP)
686 a4->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
687 else
688 a3->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
689 if (mode & S_IXGRP)
690 a4->ae_perm |= ACL_EXECUTE;
691 else
692 a3->ae_perm |= ACL_EXECUTE;
693
694 if (mode & S_IROTH)
695 a6->ae_perm |= ACL_READ_DATA;
696 else
697 a5->ae_perm |= ACL_READ_DATA;
698 if (mode & S_IWOTH)
699 a6->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
700 else
701 a5->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
702 if (mode & S_IXOTH)
703 a6->ae_perm |= ACL_EXECUTE;
704 else
705 a5->ae_perm |= ACL_EXECUTE;
706 }
707
708 #ifdef _KERNEL
709 void
acl_nfs4_sync_acl_from_mode(struct acl * aclp,mode_t mode,int file_owner_id)710 acl_nfs4_sync_acl_from_mode(struct acl *aclp, mode_t mode,
711 int file_owner_id)
712 {
713
714 if (acl_nfs4_old_semantics)
715 acl_nfs4_sync_acl_from_mode_draft(aclp, mode, file_owner_id);
716 else
717 acl_nfs4_trivial_from_mode(aclp, mode);
718 }
719 #endif /* _KERNEL */
720
721 void
acl_nfs4_sync_mode_from_acl(mode_t * _mode,const struct acl * aclp)722 acl_nfs4_sync_mode_from_acl(mode_t *_mode, const struct acl *aclp)
723 {
724 int i;
725 mode_t old_mode = *_mode, mode = 0, seen = 0;
726 const struct acl_entry *entry;
727
728 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES,
729 ("aclp->acl_cnt <= ACL_MAX_ENTRIES"));
730
731 /*
732 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt
733 *
734 * 3.16.6.1. Recomputing mode upon SETATTR of ACL
735 */
736
737 for (i = 0; i < aclp->acl_cnt; i++) {
738 entry = &(aclp->acl_entry[i]);
739
740 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW &&
741 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY)
742 continue;
743
744 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY)
745 continue;
746
747 if (entry->ae_tag == ACL_USER_OBJ) {
748 if ((entry->ae_perm & ACL_READ_DATA) &&
749 ((seen & S_IRUSR) == 0)) {
750 seen |= S_IRUSR;
751 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
752 mode |= S_IRUSR;
753 }
754 if ((entry->ae_perm & ACL_WRITE_DATA) &&
755 ((seen & S_IWUSR) == 0)) {
756 seen |= S_IWUSR;
757 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
758 mode |= S_IWUSR;
759 }
760 if ((entry->ae_perm & ACL_EXECUTE) &&
761 ((seen & S_IXUSR) == 0)) {
762 seen |= S_IXUSR;
763 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
764 mode |= S_IXUSR;
765 }
766 } else if (entry->ae_tag == ACL_GROUP_OBJ) {
767 if ((entry->ae_perm & ACL_READ_DATA) &&
768 ((seen & S_IRGRP) == 0)) {
769 seen |= S_IRGRP;
770 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
771 mode |= S_IRGRP;
772 }
773 if ((entry->ae_perm & ACL_WRITE_DATA) &&
774 ((seen & S_IWGRP) == 0)) {
775 seen |= S_IWGRP;
776 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
777 mode |= S_IWGRP;
778 }
779 if ((entry->ae_perm & ACL_EXECUTE) &&
780 ((seen & S_IXGRP) == 0)) {
781 seen |= S_IXGRP;
782 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
783 mode |= S_IXGRP;
784 }
785 } else if (entry->ae_tag == ACL_EVERYONE) {
786 if (entry->ae_perm & ACL_READ_DATA) {
787 if ((seen & S_IRUSR) == 0) {
788 seen |= S_IRUSR;
789 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
790 mode |= S_IRUSR;
791 }
792 if ((seen & S_IRGRP) == 0) {
793 seen |= S_IRGRP;
794 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
795 mode |= S_IRGRP;
796 }
797 if ((seen & S_IROTH) == 0) {
798 seen |= S_IROTH;
799 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
800 mode |= S_IROTH;
801 }
802 }
803 if (entry->ae_perm & ACL_WRITE_DATA) {
804 if ((seen & S_IWUSR) == 0) {
805 seen |= S_IWUSR;
806 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
807 mode |= S_IWUSR;
808 }
809 if ((seen & S_IWGRP) == 0) {
810 seen |= S_IWGRP;
811 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
812 mode |= S_IWGRP;
813 }
814 if ((seen & S_IWOTH) == 0) {
815 seen |= S_IWOTH;
816 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
817 mode |= S_IWOTH;
818 }
819 }
820 if (entry->ae_perm & ACL_EXECUTE) {
821 if ((seen & S_IXUSR) == 0) {
822 seen |= S_IXUSR;
823 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
824 mode |= S_IXUSR;
825 }
826 if ((seen & S_IXGRP) == 0) {
827 seen |= S_IXGRP;
828 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
829 mode |= S_IXGRP;
830 }
831 if ((seen & S_IXOTH) == 0) {
832 seen |= S_IXOTH;
833 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
834 mode |= S_IXOTH;
835 }
836 }
837 }
838 }
839
840 *_mode = mode | (old_mode & ACL_PRESERVE_MASK);
841 }
842
843 #ifdef _KERNEL
844 /*
845 * Calculate inherited ACL in a manner compatible with NFSv4 Minor Version 1,
846 * draft-ietf-nfsv4-minorversion1-03.txt.
847 */
848 static void
acl_nfs4_compute_inherited_acl_draft(const struct acl * parent_aclp,struct acl * child_aclp,mode_t mode,int file_owner_id,int is_directory)849 acl_nfs4_compute_inherited_acl_draft(const struct acl *parent_aclp,
850 struct acl *child_aclp, mode_t mode, int file_owner_id,
851 int is_directory)
852 {
853 int i, flags;
854 const struct acl_entry *parent_entry;
855 struct acl_entry *entry, *copy;
856
857 KASSERT(child_aclp->acl_cnt == 0, ("child_aclp->acl_cnt == 0"));
858 KASSERT(parent_aclp->acl_cnt <= ACL_MAX_ENTRIES,
859 ("parent_aclp->acl_cnt <= ACL_MAX_ENTRIES"));
860
861 /*
862 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt
863 *
864 * 3.16.6.2. Applying the mode given to CREATE or OPEN
865 * to an inherited ACL
866 */
867
868 /*
869 * 1. Form an ACL that is the concatenation of all inheritable ACEs.
870 */
871 for (i = 0; i < parent_aclp->acl_cnt; i++) {
872 parent_entry = &(parent_aclp->acl_entry[i]);
873 flags = parent_entry->ae_flags;
874
875 /*
876 * Entry is not inheritable at all.
877 */
878 if ((flags & (ACL_ENTRY_DIRECTORY_INHERIT |
879 ACL_ENTRY_FILE_INHERIT)) == 0)
880 continue;
881
882 /*
883 * We're creating a file, but entry is not inheritable
884 * by files.
885 */
886 if (!is_directory && (flags & ACL_ENTRY_FILE_INHERIT) == 0)
887 continue;
888
889 /*
890 * Entry is inheritable only by files, but has NO_PROPAGATE
891 * flag set, and we're creating a directory, so it wouldn't
892 * propagate to any file in that directory anyway.
893 */
894 if (is_directory &&
895 (flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0 &&
896 (flags & ACL_ENTRY_NO_PROPAGATE_INHERIT))
897 continue;
898
899 KASSERT(child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES,
900 ("child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES"));
901 child_aclp->acl_entry[child_aclp->acl_cnt] = *parent_entry;
902 child_aclp->acl_cnt++;
903 }
904
905 /*
906 * 2. For each entry in the new ACL, adjust its flags, possibly
907 * creating two entries in place of one.
908 */
909 for (i = 0; i < child_aclp->acl_cnt; i++) {
910 entry = &(child_aclp->acl_entry[i]);
911
912 /*
913 * This is not in the specification, but SunOS
914 * apparently does that.
915 */
916 if (((entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT) ||
917 !is_directory) &&
918 entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
919 entry->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER);
920
921 /*
922 * 2.A. If the ACL_ENTRY_NO_PROPAGATE_INHERIT is set, or if the object
923 * being created is not a directory, then clear the
924 * following flags: ACL_ENTRY_NO_PROPAGATE_INHERIT,
925 * ACL_ENTRY_FILE_INHERIT, ACL_ENTRY_DIRECTORY_INHERIT,
926 * ACL_ENTRY_INHERIT_ONLY.
927 */
928 if (entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT ||
929 !is_directory) {
930 entry->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT |
931 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT |
932 ACL_ENTRY_INHERIT_ONLY);
933
934 /*
935 * Continue on to the next ACE.
936 */
937 continue;
938 }
939
940 /*
941 * 2.B. If the object is a directory and ACL_ENTRY_FILE_INHERIT
942 * is set, but ACL_ENTRY_NO_PROPAGATE_INHERIT is not set, ensure
943 * that ACL_ENTRY_INHERIT_ONLY is set. Continue to the
944 * next ACE. Otherwise...
945 */
946 /*
947 * XXX: Read it again and make sure what does the "otherwise"
948 * apply to.
949 */
950 if (is_directory &&
951 (entry->ae_flags & ACL_ENTRY_FILE_INHERIT) &&
952 ((entry->ae_flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0)) {
953 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY;
954 continue;
955 }
956
957 /*
958 * 2.C. If the type of the ACE is neither ALLOW nor deny,
959 * then continue.
960 */
961 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW &&
962 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY)
963 continue;
964
965 /*
966 * 2.D. Copy the original ACE into a second, adjacent ACE.
967 */
968 copy = _acl_duplicate_entry(child_aclp, i);
969
970 /*
971 * 2.E. On the first ACE, ensure that ACL_ENTRY_INHERIT_ONLY
972 * is set.
973 */
974 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY;
975
976 /*
977 * 2.F. On the second ACE, clear the following flags:
978 * ACL_ENTRY_NO_PROPAGATE_INHERIT, ACL_ENTRY_FILE_INHERIT,
979 * ACL_ENTRY_DIRECTORY_INHERIT, ACL_ENTRY_INHERIT_ONLY.
980 */
981 copy->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT |
982 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT |
983 ACL_ENTRY_INHERIT_ONLY);
984
985 /*
986 * 2.G. On the second ACE, if the type is ALLOW,
987 * an implementation MAY clear the following
988 * mask bits: ACL_WRITE_ACL, ACL_WRITE_OWNER.
989 */
990 if (copy->ae_entry_type == ACL_ENTRY_TYPE_ALLOW)
991 copy->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER);
992
993 /*
994 * Increment the counter to skip the copied entry.
995 */
996 i++;
997 }
998
999 /*
1000 * 3. To ensure that the mode is honored, apply the algorithm describe
1001 * in Section 2.16.6.3, using the mode that is to be used for file
1002 * creation.
1003 */
1004 acl_nfs4_sync_acl_from_mode(child_aclp, mode, file_owner_id);
1005 }
1006 #endif /* _KERNEL */
1007
1008 /*
1009 * Populate the ACL with entries inherited from parent_aclp.
1010 */
1011 static void
acl_nfs4_inherit_entries(const struct acl * parent_aclp,struct acl * child_aclp,mode_t mode,int file_owner_id,int is_directory)1012 acl_nfs4_inherit_entries(const struct acl *parent_aclp,
1013 struct acl *child_aclp, mode_t mode, int file_owner_id,
1014 int is_directory)
1015 {
1016 int i, flags, tag;
1017 const struct acl_entry *parent_entry;
1018 struct acl_entry *entry;
1019
1020 KASSERT(parent_aclp->acl_cnt <= ACL_MAX_ENTRIES,
1021 ("parent_aclp->acl_cnt <= ACL_MAX_ENTRIES"));
1022
1023 for (i = 0; i < parent_aclp->acl_cnt; i++) {
1024 parent_entry = &(parent_aclp->acl_entry[i]);
1025 flags = parent_entry->ae_flags;
1026 tag = parent_entry->ae_tag;
1027
1028 /*
1029 * Don't inherit owner@, group@, or everyone@ entries.
1030 */
1031 if (tag == ACL_USER_OBJ || tag == ACL_GROUP_OBJ ||
1032 tag == ACL_EVERYONE)
1033 continue;
1034
1035 /*
1036 * Entry is not inheritable at all.
1037 */
1038 if ((flags & (ACL_ENTRY_DIRECTORY_INHERIT |
1039 ACL_ENTRY_FILE_INHERIT)) == 0)
1040 continue;
1041
1042 /*
1043 * We're creating a file, but entry is not inheritable
1044 * by files.
1045 */
1046 if (!is_directory && (flags & ACL_ENTRY_FILE_INHERIT) == 0)
1047 continue;
1048
1049 /*
1050 * Entry is inheritable only by files, but has NO_PROPAGATE
1051 * flag set, and we're creating a directory, so it wouldn't
1052 * propagate to any file in that directory anyway.
1053 */
1054 if (is_directory &&
1055 (flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0 &&
1056 (flags & ACL_ENTRY_NO_PROPAGATE_INHERIT))
1057 continue;
1058
1059 /*
1060 * Entry qualifies for being inherited.
1061 */
1062 KASSERT(child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES,
1063 ("child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES"));
1064 entry = &(child_aclp->acl_entry[child_aclp->acl_cnt]);
1065 *entry = *parent_entry;
1066 child_aclp->acl_cnt++;
1067
1068 entry->ae_flags &= ~ACL_ENTRY_INHERIT_ONLY;
1069
1070 /*
1071 * If the type of the ACE is neither ALLOW nor DENY,
1072 * then leave it as it is and proceed to the next one.
1073 */
1074 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW &&
1075 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY)
1076 continue;
1077
1078 /*
1079 * If the ACL_ENTRY_NO_PROPAGATE_INHERIT is set, or if
1080 * the object being created is not a directory, then clear
1081 * the following flags: ACL_ENTRY_NO_PROPAGATE_INHERIT,
1082 * ACL_ENTRY_FILE_INHERIT, ACL_ENTRY_DIRECTORY_INHERIT,
1083 * ACL_ENTRY_INHERIT_ONLY.
1084 */
1085 if (entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT ||
1086 !is_directory) {
1087 entry->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT |
1088 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT |
1089 ACL_ENTRY_INHERIT_ONLY);
1090 }
1091
1092 /*
1093 * If the object is a directory and ACL_ENTRY_FILE_INHERIT
1094 * is set, but ACL_ENTRY_DIRECTORY_INHERIT is not set, ensure
1095 * that ACL_ENTRY_INHERIT_ONLY is set.
1096 */
1097 if (is_directory &&
1098 (entry->ae_flags & ACL_ENTRY_FILE_INHERIT) &&
1099 ((entry->ae_flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0)) {
1100 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY;
1101 }
1102
1103 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW &&
1104 (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) == 0) {
1105 /*
1106 * Some permissions must never be inherited.
1107 */
1108 entry->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER |
1109 ACL_WRITE_NAMED_ATTRS | ACL_WRITE_ATTRIBUTES);
1110
1111 /*
1112 * Others must be masked according to the file mode.
1113 */
1114 if ((mode & S_IRGRP) == 0)
1115 entry->ae_perm &= ~ACL_READ_DATA;
1116 if ((mode & S_IWGRP) == 0)
1117 entry->ae_perm &=
1118 ~(ACL_WRITE_DATA | ACL_APPEND_DATA);
1119 if ((mode & S_IXGRP) == 0)
1120 entry->ae_perm &= ~ACL_EXECUTE;
1121 }
1122 }
1123 }
1124
1125 /*
1126 * Calculate inherited ACL in a manner compatible with PSARC/2010/029.
1127 * It's also being used to calculate a trivial ACL, by inheriting from
1128 * a NULL ACL.
1129 */
1130 static void
acl_nfs4_compute_inherited_acl_psarc(const struct acl * parent_aclp,struct acl * aclp,mode_t mode,int file_owner_id,int is_directory)1131 acl_nfs4_compute_inherited_acl_psarc(const struct acl *parent_aclp,
1132 struct acl *aclp, mode_t mode, int file_owner_id, int is_directory)
1133 {
1134 acl_perm_t user_allow_first = 0, user_deny = 0, group_deny = 0;
1135 acl_perm_t user_allow, group_allow, everyone_allow;
1136
1137 KASSERT(aclp->acl_cnt == 0, ("aclp->acl_cnt == 0"));
1138
1139 user_allow = group_allow = everyone_allow = ACL_READ_ACL |
1140 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | ACL_SYNCHRONIZE;
1141 user_allow |= ACL_WRITE_ACL | ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES |
1142 ACL_WRITE_NAMED_ATTRS;
1143
1144 if (mode & S_IRUSR)
1145 user_allow |= ACL_READ_DATA;
1146 if (mode & S_IWUSR)
1147 user_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
1148 if (mode & S_IXUSR)
1149 user_allow |= ACL_EXECUTE;
1150
1151 if (mode & S_IRGRP)
1152 group_allow |= ACL_READ_DATA;
1153 if (mode & S_IWGRP)
1154 group_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
1155 if (mode & S_IXGRP)
1156 group_allow |= ACL_EXECUTE;
1157
1158 if (mode & S_IROTH)
1159 everyone_allow |= ACL_READ_DATA;
1160 if (mode & S_IWOTH)
1161 everyone_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA);
1162 if (mode & S_IXOTH)
1163 everyone_allow |= ACL_EXECUTE;
1164
1165 user_deny = ((group_allow | everyone_allow) & ~user_allow);
1166 group_deny = everyone_allow & ~group_allow;
1167 user_allow_first = group_deny & ~user_deny;
1168
1169 if (user_allow_first != 0)
1170 _acl_append(aclp, ACL_USER_OBJ, user_allow_first,
1171 ACL_ENTRY_TYPE_ALLOW);
1172 if (user_deny != 0)
1173 _acl_append(aclp, ACL_USER_OBJ, user_deny,
1174 ACL_ENTRY_TYPE_DENY);
1175 if (group_deny != 0)
1176 _acl_append(aclp, ACL_GROUP_OBJ, group_deny,
1177 ACL_ENTRY_TYPE_DENY);
1178
1179 if (parent_aclp != NULL)
1180 acl_nfs4_inherit_entries(parent_aclp, aclp, mode,
1181 file_owner_id, is_directory);
1182
1183 _acl_append(aclp, ACL_USER_OBJ, user_allow, ACL_ENTRY_TYPE_ALLOW);
1184 _acl_append(aclp, ACL_GROUP_OBJ, group_allow, ACL_ENTRY_TYPE_ALLOW);
1185 _acl_append(aclp, ACL_EVERYONE, everyone_allow, ACL_ENTRY_TYPE_ALLOW);
1186 }
1187
1188 #ifdef _KERNEL
1189 void
acl_nfs4_compute_inherited_acl(const struct acl * parent_aclp,struct acl * child_aclp,mode_t mode,int file_owner_id,int is_directory)1190 acl_nfs4_compute_inherited_acl(const struct acl *parent_aclp,
1191 struct acl *child_aclp, mode_t mode, int file_owner_id,
1192 int is_directory)
1193 {
1194
1195 if (acl_nfs4_old_semantics)
1196 acl_nfs4_compute_inherited_acl_draft(parent_aclp, child_aclp,
1197 mode, file_owner_id, is_directory);
1198 else
1199 acl_nfs4_compute_inherited_acl_psarc(parent_aclp, child_aclp,
1200 mode, file_owner_id, is_directory);
1201 }
1202 #endif /* _KERNEL */
1203
1204 /*
1205 * Calculate trivial ACL in a manner compatible with PSARC/2010/029.
1206 * Note that this results in an ACL different from (but semantically
1207 * equal to) the "canonical six" trivial ACL computed using algorithm
1208 * described in draft-ietf-nfsv4-minorversion1-03.txt, 3.16.6.2.
1209 */
1210 static void
acl_nfs4_trivial_from_mode(struct acl * aclp,mode_t mode)1211 acl_nfs4_trivial_from_mode(struct acl *aclp, mode_t mode)
1212 {
1213
1214 aclp->acl_cnt = 0;
1215 acl_nfs4_compute_inherited_acl_psarc(NULL, aclp, mode, -1, -1);
1216 }
1217
1218 #ifndef _KERNEL
1219 /*
1220 * This routine is used by libc to implement acl_strip_np(3)
1221 * and acl_is_trivial_np(3).
1222 */
1223 void
acl_nfs4_trivial_from_mode_libc(struct acl * aclp,int mode,int canonical_six)1224 acl_nfs4_trivial_from_mode_libc(struct acl *aclp, int mode, int canonical_six)
1225 {
1226
1227 aclp->acl_cnt = 0;
1228 if (canonical_six)
1229 acl_nfs4_sync_acl_from_mode_draft(aclp, mode, -1);
1230 else
1231 acl_nfs4_trivial_from_mode(aclp, mode);
1232 }
1233 #endif /* !_KERNEL */
1234
1235 #ifdef _KERNEL
1236 static int
_acls_are_equal(const struct acl * a,const struct acl * b)1237 _acls_are_equal(const struct acl *a, const struct acl *b)
1238 {
1239 int i;
1240 const struct acl_entry *entrya, *entryb;
1241
1242 if (a->acl_cnt != b->acl_cnt)
1243 return (0);
1244
1245 for (i = 0; i < b->acl_cnt; i++) {
1246 entrya = &(a->acl_entry[i]);
1247 entryb = &(b->acl_entry[i]);
1248
1249 if (entrya->ae_tag != entryb->ae_tag ||
1250 entrya->ae_id != entryb->ae_id ||
1251 entrya->ae_perm != entryb->ae_perm ||
1252 entrya->ae_entry_type != entryb->ae_entry_type ||
1253 entrya->ae_flags != entryb->ae_flags)
1254 return (0);
1255 }
1256
1257 return (1);
1258 }
1259
1260 /*
1261 * This routine is used to determine whether to remove extended attribute
1262 * that stores ACL contents.
1263 */
1264 int
acl_nfs4_is_trivial(const struct acl * aclp,int file_owner_id)1265 acl_nfs4_is_trivial(const struct acl *aclp, int file_owner_id)
1266 {
1267 int trivial;
1268 mode_t tmpmode = 0;
1269 struct acl *tmpaclp;
1270
1271 if (aclp->acl_cnt > 6)
1272 return (0);
1273
1274 /*
1275 * Compute the mode from the ACL, then compute new ACL from that mode.
1276 * If the ACLs are identical, then the ACL is trivial.
1277 *
1278 * XXX: I guess there is a faster way to do this. However, even
1279 * this slow implementation significantly speeds things up
1280 * for files that don't have non-trivial ACLs - it's critical
1281 * for performance to not use EA when they are not needed.
1282 *
1283 * First try the PSARC/2010/029 semantics.
1284 */
1285 tmpaclp = acl_alloc(M_WAITOK | M_ZERO);
1286 acl_nfs4_sync_mode_from_acl(&tmpmode, aclp);
1287 acl_nfs4_trivial_from_mode(tmpaclp, tmpmode);
1288 trivial = _acls_are_equal(aclp, tmpaclp);
1289 if (trivial) {
1290 acl_free(tmpaclp);
1291 return (trivial);
1292 }
1293
1294 /*
1295 * Check if it's a draft-ietf-nfsv4-minorversion1-03.txt trivial ACL.
1296 */
1297 tmpaclp->acl_cnt = 0;
1298 acl_nfs4_sync_acl_from_mode_draft(tmpaclp, tmpmode, file_owner_id);
1299 trivial = _acls_are_equal(aclp, tmpaclp);
1300 acl_free(tmpaclp);
1301
1302 return (trivial);
1303 }
1304 #endif /* _KERNEL */
1305
1306 int
acl_nfs4_check(const struct acl * aclp,int is_directory)1307 acl_nfs4_check(const struct acl *aclp, int is_directory)
1308 {
1309 int i;
1310 const struct acl_entry *entry;
1311
1312 /*
1313 * The spec doesn't seem to say anything about ACL validity.
1314 * It seems there is not much to do here. There is even no need
1315 * to count "owner@" or "everyone@" (ACL_USER_OBJ and ACL_EVERYONE)
1316 * entries, as there can be several of them and that's perfectly
1317 * valid. There can be none of them too. Really.
1318 */
1319
1320 if (aclp->acl_cnt > ACL_MAX_ENTRIES || aclp->acl_cnt <= 0)
1321 return (EINVAL);
1322
1323 for (i = 0; i < aclp->acl_cnt; i++) {
1324 entry = &(aclp->acl_entry[i]);
1325
1326 switch (entry->ae_tag) {
1327 case ACL_USER_OBJ:
1328 case ACL_GROUP_OBJ:
1329 case ACL_EVERYONE:
1330 if (entry->ae_id != ACL_UNDEFINED_ID)
1331 return (EINVAL);
1332 break;
1333
1334 case ACL_USER:
1335 case ACL_GROUP:
1336 if (entry->ae_id == ACL_UNDEFINED_ID)
1337 return (EINVAL);
1338 break;
1339
1340 default:
1341 return (EINVAL);
1342 }
1343
1344 if ((entry->ae_perm | ACL_NFS4_PERM_BITS) != ACL_NFS4_PERM_BITS)
1345 return (EINVAL);
1346
1347 /*
1348 * Disallow ACL_ENTRY_TYPE_AUDIT and ACL_ENTRY_TYPE_ALARM for now.
1349 */
1350 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW &&
1351 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY)
1352 return (EINVAL);
1353
1354 if ((entry->ae_flags | ACL_FLAGS_BITS) != ACL_FLAGS_BITS)
1355 return (EINVAL);
1356
1357 /* Disallow unimplemented flags. */
1358 if (entry->ae_flags & (ACL_ENTRY_SUCCESSFUL_ACCESS |
1359 ACL_ENTRY_FAILED_ACCESS))
1360 return (EINVAL);
1361
1362 /* Disallow flags not allowed for ordinary files. */
1363 if (!is_directory) {
1364 if (entry->ae_flags & (ACL_ENTRY_FILE_INHERIT |
1365 ACL_ENTRY_DIRECTORY_INHERIT |
1366 ACL_ENTRY_NO_PROPAGATE_INHERIT | ACL_ENTRY_INHERIT_ONLY))
1367 return (EINVAL);
1368 }
1369 }
1370
1371 return (0);
1372 }
1373