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1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 */
24
25
26 #include <sys/types.h>
27 #include <sys/param.h>
28 #include <sys/time.h>
29 #include <sys/systm.h>
30 #include <sys/sysmacros.h>
31 #include <sys/resource.h>
32 #include <sys/vfs.h>
33 #include <sys/vnode.h>
34 #include <sys/sid.h>
35 #include <sys/file.h>
36 #include <sys/stat.h>
37 #include <sys/kmem.h>
38 #include <sys/cmn_err.h>
39 #include <sys/errno.h>
40 #include <sys/unistd.h>
41 #include <sys/sdt.h>
42 #include <sys/fs/zfs.h>
43 #include <sys/mode.h>
44 #include <sys/policy.h>
45 #include <sys/zfs_znode.h>
46 #include <sys/zfs_fuid.h>
47 #include <sys/zfs_acl.h>
48 #include <sys/zfs_dir.h>
49 #include <sys/zfs_vfsops.h>
50 #include <sys/dmu.h>
51 #include <sys/dnode.h>
52 #include <sys/zap.h>
53 #include <sys/sa.h>
54 #include "fs/fs_subr.h"
55
56 #define ALLOW ACE_ACCESS_ALLOWED_ACE_TYPE
57 #define DENY ACE_ACCESS_DENIED_ACE_TYPE
58 #define MAX_ACE_TYPE ACE_SYSTEM_ALARM_CALLBACK_OBJECT_ACE_TYPE
59 #define MIN_ACE_TYPE ALLOW
60
61 #define OWNING_GROUP (ACE_GROUP|ACE_IDENTIFIER_GROUP)
62 #define EVERYONE_ALLOW_MASK (ACE_READ_ACL|ACE_READ_ATTRIBUTES | \
63 ACE_READ_NAMED_ATTRS|ACE_SYNCHRONIZE)
64 #define EVERYONE_DENY_MASK (ACE_WRITE_ACL|ACE_WRITE_OWNER | \
65 ACE_WRITE_ATTRIBUTES|ACE_WRITE_NAMED_ATTRS)
66 #define OWNER_ALLOW_MASK (ACE_WRITE_ACL | ACE_WRITE_OWNER | \
67 ACE_WRITE_ATTRIBUTES|ACE_WRITE_NAMED_ATTRS)
68
69 #define ZFS_CHECKED_MASKS (ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_READ_DATA| \
70 ACE_READ_NAMED_ATTRS|ACE_WRITE_DATA|ACE_WRITE_ATTRIBUTES| \
71 ACE_WRITE_NAMED_ATTRS|ACE_APPEND_DATA|ACE_EXECUTE|ACE_WRITE_OWNER| \
72 ACE_WRITE_ACL|ACE_DELETE|ACE_DELETE_CHILD|ACE_SYNCHRONIZE)
73
74 #define WRITE_MASK_DATA (ACE_WRITE_DATA|ACE_APPEND_DATA|ACE_WRITE_NAMED_ATTRS)
75 #define WRITE_MASK_ATTRS (ACE_WRITE_ACL|ACE_WRITE_OWNER|ACE_WRITE_ATTRIBUTES| \
76 ACE_DELETE|ACE_DELETE_CHILD)
77 #define WRITE_MASK (WRITE_MASK_DATA|WRITE_MASK_ATTRS)
78
79 #define OGE_CLEAR (ACE_READ_DATA|ACE_LIST_DIRECTORY|ACE_WRITE_DATA| \
80 ACE_ADD_FILE|ACE_APPEND_DATA|ACE_ADD_SUBDIRECTORY|ACE_EXECUTE)
81
82 #define OKAY_MASK_BITS (ACE_READ_DATA|ACE_LIST_DIRECTORY|ACE_WRITE_DATA| \
83 ACE_ADD_FILE|ACE_APPEND_DATA|ACE_ADD_SUBDIRECTORY|ACE_EXECUTE)
84
85 #define ALL_INHERIT (ACE_FILE_INHERIT_ACE|ACE_DIRECTORY_INHERIT_ACE | \
86 ACE_NO_PROPAGATE_INHERIT_ACE|ACE_INHERIT_ONLY_ACE|ACE_INHERITED_ACE)
87
88 #define RESTRICTED_CLEAR (ACE_WRITE_ACL|ACE_WRITE_OWNER)
89
90 #define V4_ACL_WIDE_FLAGS (ZFS_ACL_AUTO_INHERIT|ZFS_ACL_DEFAULTED|\
91 ZFS_ACL_PROTECTED)
92
93 #define ZFS_ACL_WIDE_FLAGS (V4_ACL_WIDE_FLAGS|ZFS_ACL_TRIVIAL|ZFS_INHERIT_ACE|\
94 ZFS_ACL_OBJ_ACE)
95
96 #define ALL_MODE_EXECS (S_IXUSR | S_IXGRP | S_IXOTH)
97
98 static uint16_t
99 zfs_ace_v0_get_type(void *acep)
100 {
101 return (((zfs_oldace_t *)acep)->z_type);
102 }
103
104 static uint16_t
105 zfs_ace_v0_get_flags(void *acep)
106 {
107 return (((zfs_oldace_t *)acep)->z_flags);
108 }
109
110 static uint32_t
111 zfs_ace_v0_get_mask(void *acep)
112 {
113 return (((zfs_oldace_t *)acep)->z_access_mask);
114 }
115
116 static uint64_t
117 zfs_ace_v0_get_who(void *acep)
118 {
119 return (((zfs_oldace_t *)acep)->z_fuid);
120 }
121
122 static void
123 zfs_ace_v0_set_type(void *acep, uint16_t type)
124 {
125 ((zfs_oldace_t *)acep)->z_type = type;
126 }
127
128 static void
129 zfs_ace_v0_set_flags(void *acep, uint16_t flags)
130 {
131 ((zfs_oldace_t *)acep)->z_flags = flags;
132 }
133
134 static void
135 zfs_ace_v0_set_mask(void *acep, uint32_t mask)
136 {
137 ((zfs_oldace_t *)acep)->z_access_mask = mask;
138 }
139
140 static void
141 zfs_ace_v0_set_who(void *acep, uint64_t who)
142 {
143 ((zfs_oldace_t *)acep)->z_fuid = who;
144 }
145
146 /*ARGSUSED*/
147 static size_t
148 zfs_ace_v0_size(void *acep)
149 {
150 return (sizeof (zfs_oldace_t));
151 }
152
153 static size_t
154 zfs_ace_v0_abstract_size(void)
155 {
156 return (sizeof (zfs_oldace_t));
157 }
158
159 static int
160 zfs_ace_v0_mask_off(void)
161 {
162 return (offsetof(zfs_oldace_t, z_access_mask));
163 }
164
165 /*ARGSUSED*/
166 static int
167 zfs_ace_v0_data(void *acep, void **datap)
168 {
169 *datap = NULL;
170 return (0);
171 }
172
173 static acl_ops_t zfs_acl_v0_ops = {
174 zfs_ace_v0_get_mask,
175 zfs_ace_v0_set_mask,
176 zfs_ace_v0_get_flags,
177 zfs_ace_v0_set_flags,
178 zfs_ace_v0_get_type,
179 zfs_ace_v0_set_type,
180 zfs_ace_v0_get_who,
181 zfs_ace_v0_set_who,
182 zfs_ace_v0_size,
183 zfs_ace_v0_abstract_size,
184 zfs_ace_v0_mask_off,
185 zfs_ace_v0_data
186 };
187
188 static uint16_t
189 zfs_ace_fuid_get_type(void *acep)
190 {
191 return (((zfs_ace_hdr_t *)acep)->z_type);
192 }
193
194 static uint16_t
195 zfs_ace_fuid_get_flags(void *acep)
196 {
197 return (((zfs_ace_hdr_t *)acep)->z_flags);
198 }
199
200 static uint32_t
201 zfs_ace_fuid_get_mask(void *acep)
202 {
203 return (((zfs_ace_hdr_t *)acep)->z_access_mask);
204 }
205
206 static uint64_t
207 zfs_ace_fuid_get_who(void *args)
208 {
209 uint16_t entry_type;
210 zfs_ace_t *acep = args;
211
212 entry_type = acep->z_hdr.z_flags & ACE_TYPE_FLAGS;
213
214 if (entry_type == ACE_OWNER || entry_type == OWNING_GROUP ||
215 entry_type == ACE_EVERYONE)
216 return (-1);
217 return (((zfs_ace_t *)acep)->z_fuid);
218 }
219
220 static void
221 zfs_ace_fuid_set_type(void *acep, uint16_t type)
222 {
223 ((zfs_ace_hdr_t *)acep)->z_type = type;
224 }
225
226 static void
227 zfs_ace_fuid_set_flags(void *acep, uint16_t flags)
228 {
229 ((zfs_ace_hdr_t *)acep)->z_flags = flags;
230 }
231
232 static void
233 zfs_ace_fuid_set_mask(void *acep, uint32_t mask)
234 {
235 ((zfs_ace_hdr_t *)acep)->z_access_mask = mask;
236 }
237
238 static void
239 zfs_ace_fuid_set_who(void *arg, uint64_t who)
240 {
241 zfs_ace_t *acep = arg;
242
243 uint16_t entry_type = acep->z_hdr.z_flags & ACE_TYPE_FLAGS;
244
245 if (entry_type == ACE_OWNER || entry_type == OWNING_GROUP ||
246 entry_type == ACE_EVERYONE)
247 return;
248 acep->z_fuid = who;
249 }
250
251 static size_t
252 zfs_ace_fuid_size(void *acep)
253 {
254 zfs_ace_hdr_t *zacep = acep;
255 uint16_t entry_type;
256
257 switch (zacep->z_type) {
258 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
259 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
260 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
261 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
262 return (sizeof (zfs_object_ace_t));
263 case ALLOW:
264 case DENY:
265 entry_type =
266 (((zfs_ace_hdr_t *)acep)->z_flags & ACE_TYPE_FLAGS);
267 if (entry_type == ACE_OWNER ||
268 entry_type == OWNING_GROUP ||
269 entry_type == ACE_EVERYONE)
270 return (sizeof (zfs_ace_hdr_t));
271 /*FALLTHROUGH*/
272 default:
273 return (sizeof (zfs_ace_t));
274 }
275 }
276
277 static size_t
278 zfs_ace_fuid_abstract_size(void)
279 {
280 return (sizeof (zfs_ace_hdr_t));
281 }
282
283 static int
284 zfs_ace_fuid_mask_off(void)
285 {
286 return (offsetof(zfs_ace_hdr_t, z_access_mask));
287 }
288
289 static int
290 zfs_ace_fuid_data(void *acep, void **datap)
291 {
292 zfs_ace_t *zacep = acep;
293 zfs_object_ace_t *zobjp;
294
295 switch (zacep->z_hdr.z_type) {
296 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
297 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
298 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
299 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
300 zobjp = acep;
301 *datap = (caddr_t)zobjp + sizeof (zfs_ace_t);
302 return (sizeof (zfs_object_ace_t) - sizeof (zfs_ace_t));
303 default:
304 *datap = NULL;
305 return (0);
306 }
307 }
308
309 static acl_ops_t zfs_acl_fuid_ops = {
310 zfs_ace_fuid_get_mask,
311 zfs_ace_fuid_set_mask,
312 zfs_ace_fuid_get_flags,
313 zfs_ace_fuid_set_flags,
314 zfs_ace_fuid_get_type,
315 zfs_ace_fuid_set_type,
316 zfs_ace_fuid_get_who,
317 zfs_ace_fuid_set_who,
318 zfs_ace_fuid_size,
319 zfs_ace_fuid_abstract_size,
320 zfs_ace_fuid_mask_off,
321 zfs_ace_fuid_data
322 };
323
324 /*
325 * The following three functions are provided for compatibility with
326 * older ZPL version in order to determine if the file use to have
327 * an external ACL and what version of ACL previously existed on the
328 * file. Would really be nice to not need this, sigh.
329 */
330 uint64_t
331 zfs_external_acl(znode_t *zp)
332 {
333 zfs_acl_phys_t acl_phys;
334 int error;
335
336 if (zp->z_is_sa)
337 return (0);
338
339 /*
340 * Need to deal with a potential
341 * race where zfs_sa_upgrade could cause
342 * z_isa_sa to change.
343 *
344 * If the lookup fails then the state of z_is_sa should have
345 * changed.
346 */
347
348 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_ZNODE_ACL(ZTOZSB(zp)),
349 &acl_phys, sizeof (acl_phys))) == 0)
350 return (acl_phys.z_acl_extern_obj);
351 else {
352 /*
353 * after upgrade the SA_ZPL_ZNODE_ACL should have been
354 * removed
355 */
356 VERIFY(zp->z_is_sa && error == ENOENT);
357 return (0);
358 }
359 }
360
361 /*
362 * Determine size of ACL in bytes
363 *
364 * This is more complicated than it should be since we have to deal
365 * with old external ACLs.
366 */
367 static int
368 zfs_acl_znode_info(znode_t *zp, int *aclsize, int *aclcount,
369 zfs_acl_phys_t *aclphys)
370 {
371 zfs_sb_t *zsb = ZTOZSB(zp);
372 uint64_t acl_count;
373 int size;
374 int error;
375
376 ASSERT(MUTEX_HELD(&zp->z_acl_lock));
377 if (zp->z_is_sa) {
378 if ((error = sa_size(zp->z_sa_hdl, SA_ZPL_DACL_ACES(zsb),
379 &size)) != 0)
380 return (error);
381 *aclsize = size;
382 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_DACL_COUNT(zsb),
383 &acl_count, sizeof (acl_count))) != 0)
384 return (error);
385 *aclcount = acl_count;
386 } else {
387 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_ZNODE_ACL(zsb),
388 aclphys, sizeof (*aclphys))) != 0)
389 return (error);
390
391 if (aclphys->z_acl_version == ZFS_ACL_VERSION_INITIAL) {
392 *aclsize = ZFS_ACL_SIZE(aclphys->z_acl_size);
393 *aclcount = aclphys->z_acl_size;
394 } else {
395 *aclsize = aclphys->z_acl_size;
396 *aclcount = aclphys->z_acl_count;
397 }
398 }
399 return (0);
400 }
401
402 int
403 zfs_znode_acl_version(znode_t *zp)
404 {
405 zfs_acl_phys_t acl_phys;
406
407 if (zp->z_is_sa)
408 return (ZFS_ACL_VERSION_FUID);
409 else {
410 int error;
411
412 /*
413 * Need to deal with a potential
414 * race where zfs_sa_upgrade could cause
415 * z_isa_sa to change.
416 *
417 * If the lookup fails then the state of z_is_sa should have
418 * changed.
419 */
420 if ((error = sa_lookup(zp->z_sa_hdl,
421 SA_ZPL_ZNODE_ACL(ZTOZSB(zp)),
422 &acl_phys, sizeof (acl_phys))) == 0)
423 return (acl_phys.z_acl_version);
424 else {
425 /*
426 * After upgrade SA_ZPL_ZNODE_ACL should have
427 * been removed.
428 */
429 VERIFY(zp->z_is_sa && error == ENOENT);
430 return (ZFS_ACL_VERSION_FUID);
431 }
432 }
433 }
434
435 static int
436 zfs_acl_version(int version)
437 {
438 if (version < ZPL_VERSION_FUID)
439 return (ZFS_ACL_VERSION_INITIAL);
440 else
441 return (ZFS_ACL_VERSION_FUID);
442 }
443
444 static int
445 zfs_acl_version_zp(znode_t *zp)
446 {
447 return (zfs_acl_version(ZTOZSB(zp)->z_version));
448 }
449
450 zfs_acl_t *
451 zfs_acl_alloc(int vers)
452 {
453 zfs_acl_t *aclp;
454
455 aclp = kmem_zalloc(sizeof (zfs_acl_t), KM_SLEEP);
456 list_create(&aclp->z_acl, sizeof (zfs_acl_node_t),
457 offsetof(zfs_acl_node_t, z_next));
458 aclp->z_version = vers;
459 if (vers == ZFS_ACL_VERSION_FUID)
460 aclp->z_ops = zfs_acl_fuid_ops;
461 else
462 aclp->z_ops = zfs_acl_v0_ops;
463 return (aclp);
464 }
465
466 zfs_acl_node_t *
467 zfs_acl_node_alloc(size_t bytes)
468 {
469 zfs_acl_node_t *aclnode;
470
471 aclnode = kmem_zalloc(sizeof (zfs_acl_node_t), KM_SLEEP);
472 if (bytes) {
473 aclnode->z_acldata = kmem_alloc(bytes, KM_SLEEP);
474 aclnode->z_allocdata = aclnode->z_acldata;
475 aclnode->z_allocsize = bytes;
476 aclnode->z_size = bytes;
477 }
478
479 return (aclnode);
480 }
481
482 static void
483 zfs_acl_node_free(zfs_acl_node_t *aclnode)
484 {
485 if (aclnode->z_allocsize)
486 kmem_free(aclnode->z_allocdata, aclnode->z_allocsize);
487 kmem_free(aclnode, sizeof (zfs_acl_node_t));
488 }
489
490 static void
491 zfs_acl_release_nodes(zfs_acl_t *aclp)
492 {
493 zfs_acl_node_t *aclnode;
494
495 while ((aclnode = list_head(&aclp->z_acl))) {
496 list_remove(&aclp->z_acl, aclnode);
497 zfs_acl_node_free(aclnode);
498 }
499 aclp->z_acl_count = 0;
500 aclp->z_acl_bytes = 0;
501 }
502
503 void
504 zfs_acl_free(zfs_acl_t *aclp)
505 {
506 zfs_acl_release_nodes(aclp);
507 list_destroy(&aclp->z_acl);
508 kmem_free(aclp, sizeof (zfs_acl_t));
509 }
510
511 static boolean_t
512 zfs_acl_valid_ace_type(uint_t type, uint_t flags)
513 {
514 uint16_t entry_type;
515
516 switch (type) {
517 case ALLOW:
518 case DENY:
519 case ACE_SYSTEM_AUDIT_ACE_TYPE:
520 case ACE_SYSTEM_ALARM_ACE_TYPE:
521 entry_type = flags & ACE_TYPE_FLAGS;
522 return (entry_type == ACE_OWNER ||
523 entry_type == OWNING_GROUP ||
524 entry_type == ACE_EVERYONE || entry_type == 0 ||
525 entry_type == ACE_IDENTIFIER_GROUP);
526 default:
527 if (type >= MIN_ACE_TYPE && type <= MAX_ACE_TYPE)
528 return (B_TRUE);
529 }
530 return (B_FALSE);
531 }
532
533 static boolean_t
534 zfs_ace_valid(umode_t obj_mode, zfs_acl_t *aclp, uint16_t type, uint16_t iflags)
535 {
536 /*
537 * first check type of entry
538 */
539
540 if (!zfs_acl_valid_ace_type(type, iflags))
541 return (B_FALSE);
542
543 switch (type) {
544 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
545 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
546 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
547 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
548 if (aclp->z_version < ZFS_ACL_VERSION_FUID)
549 return (B_FALSE);
550 aclp->z_hints |= ZFS_ACL_OBJ_ACE;
551 }
552
553 /*
554 * next check inheritance level flags
555 */
556
557 if (S_ISDIR(obj_mode) &&
558 (iflags & (ACE_FILE_INHERIT_ACE|ACE_DIRECTORY_INHERIT_ACE)))
559 aclp->z_hints |= ZFS_INHERIT_ACE;
560
561 if (iflags & (ACE_INHERIT_ONLY_ACE|ACE_NO_PROPAGATE_INHERIT_ACE)) {
562 if ((iflags & (ACE_FILE_INHERIT_ACE|
563 ACE_DIRECTORY_INHERIT_ACE)) == 0) {
564 return (B_FALSE);
565 }
566 }
567
568 return (B_TRUE);
569 }
570
571 static void *
572 zfs_acl_next_ace(zfs_acl_t *aclp, void *start, uint64_t *who,
573 uint32_t *access_mask, uint16_t *iflags, uint16_t *type)
574 {
575 zfs_acl_node_t *aclnode;
576
577 ASSERT(aclp);
578
579 if (start == NULL) {
580 aclnode = list_head(&aclp->z_acl);
581 if (aclnode == NULL)
582 return (NULL);
583
584 aclp->z_next_ace = aclnode->z_acldata;
585 aclp->z_curr_node = aclnode;
586 aclnode->z_ace_idx = 0;
587 }
588
589 aclnode = aclp->z_curr_node;
590
591 if (aclnode == NULL)
592 return (NULL);
593
594 if (aclnode->z_ace_idx >= aclnode->z_ace_count) {
595 aclnode = list_next(&aclp->z_acl, aclnode);
596 if (aclnode == NULL)
597 return (NULL);
598 else {
599 aclp->z_curr_node = aclnode;
600 aclnode->z_ace_idx = 0;
601 aclp->z_next_ace = aclnode->z_acldata;
602 }
603 }
604
605 if (aclnode->z_ace_idx < aclnode->z_ace_count) {
606 void *acep = aclp->z_next_ace;
607 size_t ace_size;
608
609 /*
610 * Make sure we don't overstep our bounds
611 */
612 ace_size = aclp->z_ops.ace_size(acep);
613
614 if (((caddr_t)acep + ace_size) >
615 ((caddr_t)aclnode->z_acldata + aclnode->z_size)) {
616 return (NULL);
617 }
618
619 *iflags = aclp->z_ops.ace_flags_get(acep);
620 *type = aclp->z_ops.ace_type_get(acep);
621 *access_mask = aclp->z_ops.ace_mask_get(acep);
622 *who = aclp->z_ops.ace_who_get(acep);
623 aclp->z_next_ace = (caddr_t)aclp->z_next_ace + ace_size;
624 aclnode->z_ace_idx++;
625
626 return ((void *)acep);
627 }
628 return (NULL);
629 }
630
631 /*ARGSUSED*/
632 static uint64_t
633 zfs_ace_walk(void *datap, uint64_t cookie, int aclcnt,
634 uint16_t *flags, uint16_t *type, uint32_t *mask)
635 {
636 zfs_acl_t *aclp = datap;
637 zfs_ace_hdr_t *acep = (zfs_ace_hdr_t *)(uintptr_t)cookie;
638 uint64_t who;
639
640 acep = zfs_acl_next_ace(aclp, acep, &who, mask,
641 flags, type);
642 return ((uint64_t)(uintptr_t)acep);
643 }
644
645 /*
646 * Copy ACE to internal ZFS format.
647 * While processing the ACL each ACE will be validated for correctness.
648 * ACE FUIDs will be created later.
649 */
650 int
651 zfs_copy_ace_2_fuid(zfs_sb_t *zsb, umode_t obj_mode, zfs_acl_t *aclp,
652 void *datap, zfs_ace_t *z_acl, uint64_t aclcnt, size_t *size,
653 zfs_fuid_info_t **fuidp, cred_t *cr)
654 {
655 int i;
656 uint16_t entry_type;
657 zfs_ace_t *aceptr = z_acl;
658 ace_t *acep = datap;
659 zfs_object_ace_t *zobjacep;
660 ace_object_t *aceobjp;
661
662 for (i = 0; i != aclcnt; i++) {
663 aceptr->z_hdr.z_access_mask = acep->a_access_mask;
664 aceptr->z_hdr.z_flags = acep->a_flags;
665 aceptr->z_hdr.z_type = acep->a_type;
666 entry_type = aceptr->z_hdr.z_flags & ACE_TYPE_FLAGS;
667 if (entry_type != ACE_OWNER && entry_type != OWNING_GROUP &&
668 entry_type != ACE_EVERYONE) {
669 aceptr->z_fuid = zfs_fuid_create(zsb, acep->a_who,
670 cr, (entry_type == 0) ?
671 ZFS_ACE_USER : ZFS_ACE_GROUP, fuidp);
672 }
673
674 /*
675 * Make sure ACE is valid
676 */
677 if (zfs_ace_valid(obj_mode, aclp, aceptr->z_hdr.z_type,
678 aceptr->z_hdr.z_flags) != B_TRUE)
679 return (EINVAL);
680
681 switch (acep->a_type) {
682 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
683 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
684 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
685 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
686 zobjacep = (zfs_object_ace_t *)aceptr;
687 aceobjp = (ace_object_t *)acep;
688
689 bcopy(aceobjp->a_obj_type, zobjacep->z_object_type,
690 sizeof (aceobjp->a_obj_type));
691 bcopy(aceobjp->a_inherit_obj_type,
692 zobjacep->z_inherit_type,
693 sizeof (aceobjp->a_inherit_obj_type));
694 acep = (ace_t *)((caddr_t)acep + sizeof (ace_object_t));
695 break;
696 default:
697 acep = (ace_t *)((caddr_t)acep + sizeof (ace_t));
698 }
699
700 aceptr = (zfs_ace_t *)((caddr_t)aceptr +
701 aclp->z_ops.ace_size(aceptr));
702 }
703
704 *size = (caddr_t)aceptr - (caddr_t)z_acl;
705
706 return (0);
707 }
708
709 /*
710 * Copy ZFS ACEs to fixed size ace_t layout
711 */
712 static void
713 zfs_copy_fuid_2_ace(zfs_sb_t *zsb, zfs_acl_t *aclp, cred_t *cr,
714 void *datap, int filter)
715 {
716 uint64_t who;
717 uint32_t access_mask;
718 uint16_t iflags, type;
719 zfs_ace_hdr_t *zacep = NULL;
720 ace_t *acep = datap;
721 ace_object_t *objacep;
722 zfs_object_ace_t *zobjacep;
723 size_t ace_size;
724 uint16_t entry_type;
725
726 while ((zacep = zfs_acl_next_ace(aclp, zacep,
727 &who, &access_mask, &iflags, &type))) {
728
729 switch (type) {
730 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
731 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
732 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
733 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
734 if (filter) {
735 continue;
736 }
737 zobjacep = (zfs_object_ace_t *)zacep;
738 objacep = (ace_object_t *)acep;
739 bcopy(zobjacep->z_object_type,
740 objacep->a_obj_type,
741 sizeof (zobjacep->z_object_type));
742 bcopy(zobjacep->z_inherit_type,
743 objacep->a_inherit_obj_type,
744 sizeof (zobjacep->z_inherit_type));
745 ace_size = sizeof (ace_object_t);
746 break;
747 default:
748 ace_size = sizeof (ace_t);
749 break;
750 }
751
752 entry_type = (iflags & ACE_TYPE_FLAGS);
753 if ((entry_type != ACE_OWNER &&
754 entry_type != OWNING_GROUP &&
755 entry_type != ACE_EVERYONE)) {
756 acep->a_who = zfs_fuid_map_id(zsb, who,
757 cr, (entry_type & ACE_IDENTIFIER_GROUP) ?
758 ZFS_ACE_GROUP : ZFS_ACE_USER);
759 } else {
760 acep->a_who = (uid_t)(int64_t)who;
761 }
762 acep->a_access_mask = access_mask;
763 acep->a_flags = iflags;
764 acep->a_type = type;
765 acep = (ace_t *)((caddr_t)acep + ace_size);
766 }
767 }
768
769 static int
770 zfs_copy_ace_2_oldace(umode_t obj_mode, zfs_acl_t *aclp, ace_t *acep,
771 zfs_oldace_t *z_acl, int aclcnt, size_t *size)
772 {
773 int i;
774 zfs_oldace_t *aceptr = z_acl;
775
776 for (i = 0; i != aclcnt; i++, aceptr++) {
777 aceptr->z_access_mask = acep[i].a_access_mask;
778 aceptr->z_type = acep[i].a_type;
779 aceptr->z_flags = acep[i].a_flags;
780 aceptr->z_fuid = acep[i].a_who;
781 /*
782 * Make sure ACE is valid
783 */
784 if (zfs_ace_valid(obj_mode, aclp, aceptr->z_type,
785 aceptr->z_flags) != B_TRUE)
786 return (EINVAL);
787 }
788 *size = (caddr_t)aceptr - (caddr_t)z_acl;
789 return (0);
790 }
791
792 /*
793 * convert old ACL format to new
794 */
795 void
796 zfs_acl_xform(znode_t *zp, zfs_acl_t *aclp, cred_t *cr)
797 {
798 zfs_oldace_t *oldaclp;
799 int i;
800 uint16_t type, iflags;
801 uint32_t access_mask;
802 uint64_t who;
803 void *cookie = NULL;
804 zfs_acl_node_t *newaclnode;
805
806 ASSERT(aclp->z_version == ZFS_ACL_VERSION_INITIAL);
807 /*
808 * First create the ACE in a contiguous piece of memory
809 * for zfs_copy_ace_2_fuid().
810 *
811 * We only convert an ACL once, so this won't happen
812 * everytime.
813 */
814 oldaclp = kmem_alloc(sizeof (zfs_oldace_t) * aclp->z_acl_count,
815 KM_SLEEP);
816 i = 0;
817 while ((cookie = zfs_acl_next_ace(aclp, cookie, &who,
818 &access_mask, &iflags, &type))) {
819 oldaclp[i].z_flags = iflags;
820 oldaclp[i].z_type = type;
821 oldaclp[i].z_fuid = who;
822 oldaclp[i++].z_access_mask = access_mask;
823 }
824
825 newaclnode = zfs_acl_node_alloc(aclp->z_acl_count *
826 sizeof (zfs_object_ace_t));
827 aclp->z_ops = zfs_acl_fuid_ops;
828 VERIFY(zfs_copy_ace_2_fuid(ZTOZSB(zp), ZTOI(zp)->i_mode,
829 aclp, oldaclp, newaclnode->z_acldata, aclp->z_acl_count,
830 &newaclnode->z_size, NULL, cr) == 0);
831 newaclnode->z_ace_count = aclp->z_acl_count;
832 aclp->z_version = ZFS_ACL_VERSION;
833 kmem_free(oldaclp, aclp->z_acl_count * sizeof (zfs_oldace_t));
834
835 /*
836 * Release all previous ACL nodes
837 */
838
839 zfs_acl_release_nodes(aclp);
840
841 list_insert_head(&aclp->z_acl, newaclnode);
842
843 aclp->z_acl_bytes = newaclnode->z_size;
844 aclp->z_acl_count = newaclnode->z_ace_count;
845
846 }
847
848 /*
849 * Convert unix access mask to v4 access mask
850 */
851 static uint32_t
852 zfs_unix_to_v4(uint32_t access_mask)
853 {
854 uint32_t new_mask = 0;
855
856 if (access_mask & S_IXOTH)
857 new_mask |= ACE_EXECUTE;
858 if (access_mask & S_IWOTH)
859 new_mask |= ACE_WRITE_DATA;
860 if (access_mask & S_IROTH)
861 new_mask |= ACE_READ_DATA;
862 return (new_mask);
863 }
864
865 static void
866 zfs_set_ace(zfs_acl_t *aclp, void *acep, uint32_t access_mask,
867 uint16_t access_type, uint64_t fuid, uint16_t entry_type)
868 {
869 uint16_t type = entry_type & ACE_TYPE_FLAGS;
870
871 aclp->z_ops.ace_mask_set(acep, access_mask);
872 aclp->z_ops.ace_type_set(acep, access_type);
873 aclp->z_ops.ace_flags_set(acep, entry_type);
874 if ((type != ACE_OWNER && type != OWNING_GROUP &&
875 type != ACE_EVERYONE))
876 aclp->z_ops.ace_who_set(acep, fuid);
877 }
878
879 /*
880 * Determine mode of file based on ACL.
881 * Also, create FUIDs for any User/Group ACEs
882 */
883 uint64_t
884 zfs_mode_compute(uint64_t fmode, zfs_acl_t *aclp,
885 uint64_t *pflags, uint64_t fuid, uint64_t fgid)
886 {
887 int entry_type;
888 mode_t mode;
889 mode_t seen = 0;
890 zfs_ace_hdr_t *acep = NULL;
891 uint64_t who;
892 uint16_t iflags, type;
893 uint32_t access_mask;
894 boolean_t an_exec_denied = B_FALSE;
895
896 mode = (fmode & (S_IFMT | S_ISUID | S_ISGID | S_ISVTX));
897
898 while ((acep = zfs_acl_next_ace(aclp, acep, &who,
899 &access_mask, &iflags, &type))) {
900
901 if (!zfs_acl_valid_ace_type(type, iflags))
902 continue;
903
904 entry_type = (iflags & ACE_TYPE_FLAGS);
905
906 /*
907 * Skip over owner@, group@ or everyone@ inherit only ACEs
908 */
909 if ((iflags & ACE_INHERIT_ONLY_ACE) &&
910 (entry_type == ACE_OWNER || entry_type == ACE_EVERYONE ||
911 entry_type == OWNING_GROUP))
912 continue;
913
914 if (entry_type == ACE_OWNER || (entry_type == 0 &&
915 who == fuid)) {
916 if ((access_mask & ACE_READ_DATA) &&
917 (!(seen & S_IRUSR))) {
918 seen |= S_IRUSR;
919 if (type == ALLOW) {
920 mode |= S_IRUSR;
921 }
922 }
923 if ((access_mask & ACE_WRITE_DATA) &&
924 (!(seen & S_IWUSR))) {
925 seen |= S_IWUSR;
926 if (type == ALLOW) {
927 mode |= S_IWUSR;
928 }
929 }
930 if ((access_mask & ACE_EXECUTE) &&
931 (!(seen & S_IXUSR))) {
932 seen |= S_IXUSR;
933 if (type == ALLOW) {
934 mode |= S_IXUSR;
935 }
936 }
937 } else if (entry_type == OWNING_GROUP ||
938 (entry_type == ACE_IDENTIFIER_GROUP && who == fgid)) {
939 if ((access_mask & ACE_READ_DATA) &&
940 (!(seen & S_IRGRP))) {
941 seen |= S_IRGRP;
942 if (type == ALLOW) {
943 mode |= S_IRGRP;
944 }
945 }
946 if ((access_mask & ACE_WRITE_DATA) &&
947 (!(seen & S_IWGRP))) {
948 seen |= S_IWGRP;
949 if (type == ALLOW) {
950 mode |= S_IWGRP;
951 }
952 }
953 if ((access_mask & ACE_EXECUTE) &&
954 (!(seen & S_IXGRP))) {
955 seen |= S_IXGRP;
956 if (type == ALLOW) {
957 mode |= S_IXGRP;
958 }
959 }
960 } else if (entry_type == ACE_EVERYONE) {
961 if ((access_mask & ACE_READ_DATA)) {
962 if (!(seen & S_IRUSR)) {
963 seen |= S_IRUSR;
964 if (type == ALLOW) {
965 mode |= S_IRUSR;
966 }
967 }
968 if (!(seen & S_IRGRP)) {
969 seen |= S_IRGRP;
970 if (type == ALLOW) {
971 mode |= S_IRGRP;
972 }
973 }
974 if (!(seen & S_IROTH)) {
975 seen |= S_IROTH;
976 if (type == ALLOW) {
977 mode |= S_IROTH;
978 }
979 }
980 }
981 if ((access_mask & ACE_WRITE_DATA)) {
982 if (!(seen & S_IWUSR)) {
983 seen |= S_IWUSR;
984 if (type == ALLOW) {
985 mode |= S_IWUSR;
986 }
987 }
988 if (!(seen & S_IWGRP)) {
989 seen |= S_IWGRP;
990 if (type == ALLOW) {
991 mode |= S_IWGRP;
992 }
993 }
994 if (!(seen & S_IWOTH)) {
995 seen |= S_IWOTH;
996 if (type == ALLOW) {
997 mode |= S_IWOTH;
998 }
999 }
1000 }
1001 if ((access_mask & ACE_EXECUTE)) {
1002 if (!(seen & S_IXUSR)) {
1003 seen |= S_IXUSR;
1004 if (type == ALLOW) {
1005 mode |= S_IXUSR;
1006 }
1007 }
1008 if (!(seen & S_IXGRP)) {
1009 seen |= S_IXGRP;
1010 if (type == ALLOW) {
1011 mode |= S_IXGRP;
1012 }
1013 }
1014 if (!(seen & S_IXOTH)) {
1015 seen |= S_IXOTH;
1016 if (type == ALLOW) {
1017 mode |= S_IXOTH;
1018 }
1019 }
1020 }
1021 } else {
1022 /*
1023 * Only care if this IDENTIFIER_GROUP or
1024 * USER ACE denies execute access to someone,
1025 * mode is not affected
1026 */
1027 if ((access_mask & ACE_EXECUTE) && type == DENY)
1028 an_exec_denied = B_TRUE;
1029 }
1030 }
1031
1032 /*
1033 * Failure to allow is effectively a deny, so execute permission
1034 * is denied if it was never mentioned or if we explicitly
1035 * weren't allowed it.
1036 */
1037 if (!an_exec_denied &&
1038 ((seen & ALL_MODE_EXECS) != ALL_MODE_EXECS ||
1039 (mode & ALL_MODE_EXECS) != ALL_MODE_EXECS))
1040 an_exec_denied = B_TRUE;
1041
1042 if (an_exec_denied)
1043 *pflags &= ~ZFS_NO_EXECS_DENIED;
1044 else
1045 *pflags |= ZFS_NO_EXECS_DENIED;
1046
1047 return (mode);
1048 }
1049
1050 /*
1051 * Read an external acl object. If the intent is to modify, always
1052 * create a new acl and leave any cached acl in place.
1053 */
1054 static int
1055 zfs_acl_node_read(znode_t *zp, boolean_t have_lock, zfs_acl_t **aclpp,
1056 boolean_t will_modify)
1057 {
1058 zfs_acl_t *aclp;
1059 int aclsize;
1060 int acl_count;
1061 zfs_acl_node_t *aclnode;
1062 zfs_acl_phys_t znode_acl;
1063 int version;
1064 int error;
1065 boolean_t drop_lock = B_FALSE;
1066
1067 ASSERT(MUTEX_HELD(&zp->z_acl_lock));
1068
1069 if (zp->z_acl_cached && !will_modify) {
1070 *aclpp = zp->z_acl_cached;
1071 return (0);
1072 }
1073
1074 /*
1075 * close race where znode could be upgrade while trying to
1076 * read the znode attributes.
1077 *
1078 * But this could only happen if the file isn't already an SA
1079 * znode
1080 */
1081 if (!zp->z_is_sa && !have_lock) {
1082 mutex_enter(&zp->z_lock);
1083 drop_lock = B_TRUE;
1084 }
1085 version = zfs_znode_acl_version(zp);
1086
1087 if ((error = zfs_acl_znode_info(zp, &aclsize,
1088 &acl_count, &znode_acl)) != 0) {
1089 goto done;
1090 }
1091
1092 aclp = zfs_acl_alloc(version);
1093
1094 aclp->z_acl_count = acl_count;
1095 aclp->z_acl_bytes = aclsize;
1096
1097 aclnode = zfs_acl_node_alloc(aclsize);
1098 aclnode->z_ace_count = aclp->z_acl_count;
1099 aclnode->z_size = aclsize;
1100
1101 if (!zp->z_is_sa) {
1102 if (znode_acl.z_acl_extern_obj) {
1103 error = dmu_read(ZTOZSB(zp)->z_os,
1104 znode_acl.z_acl_extern_obj, 0, aclnode->z_size,
1105 aclnode->z_acldata, DMU_READ_PREFETCH);
1106 } else {
1107 bcopy(znode_acl.z_ace_data, aclnode->z_acldata,
1108 aclnode->z_size);
1109 }
1110 } else {
1111 error = sa_lookup(zp->z_sa_hdl, SA_ZPL_DACL_ACES(ZTOZSB(zp)),
1112 aclnode->z_acldata, aclnode->z_size);
1113 }
1114
1115 if (error != 0) {
1116 zfs_acl_free(aclp);
1117 zfs_acl_node_free(aclnode);
1118 /* convert checksum errors into IO errors */
1119 if (error == ECKSUM)
1120 error = EIO;
1121 goto done;
1122 }
1123
1124 list_insert_head(&aclp->z_acl, aclnode);
1125
1126 *aclpp = aclp;
1127 if (!will_modify)
1128 zp->z_acl_cached = aclp;
1129 done:
1130 if (drop_lock)
1131 mutex_exit(&zp->z_lock);
1132 return (error);
1133 }
1134
1135 /*ARGSUSED*/
1136 void
1137 zfs_acl_data_locator(void **dataptr, uint32_t *length, uint32_t buflen,
1138 boolean_t start, void *userdata)
1139 {
1140 zfs_acl_locator_cb_t *cb = (zfs_acl_locator_cb_t *)userdata;
1141
1142 if (start) {
1143 cb->cb_acl_node = list_head(&cb->cb_aclp->z_acl);
1144 } else {
1145 cb->cb_acl_node = list_next(&cb->cb_aclp->z_acl,
1146 cb->cb_acl_node);
1147 }
1148 *dataptr = cb->cb_acl_node->z_acldata;
1149 *length = cb->cb_acl_node->z_size;
1150 }
1151
1152 int
1153 zfs_acl_chown_setattr(znode_t *zp)
1154 {
1155 int error;
1156 zfs_acl_t *aclp;
1157
1158 ASSERT(MUTEX_HELD(&zp->z_lock));
1159 ASSERT(MUTEX_HELD(&zp->z_acl_lock));
1160
1161 if ((error = zfs_acl_node_read(zp, B_TRUE, &aclp, B_FALSE)) == 0)
1162 zp->z_mode = zfs_mode_compute(zp->z_mode, aclp,
1163 &zp->z_pflags, zp->z_uid, zp->z_gid);
1164 return (error);
1165 }
1166
1167 static void
1168 acl_trivial_access_masks(mode_t mode, uint32_t *allow0, uint32_t *deny1,
1169 uint32_t *deny2, uint32_t *owner, uint32_t *group, uint32_t *everyone)
1170 {
1171 *deny1 = *deny2 = *allow0 = *group = 0;
1172
1173 if (!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH)))
1174 *deny1 |= ACE_READ_DATA;
1175 if (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IWOTH)))
1176 *deny1 |= ACE_WRITE_DATA;
1177 if (!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH)))
1178 *deny1 |= ACE_EXECUTE;
1179
1180 if (!(mode & S_IRGRP) && (mode & S_IROTH))
1181 *deny2 = ACE_READ_DATA;
1182 if (!(mode & S_IWGRP) && (mode & S_IWOTH))
1183 *deny2 |= ACE_WRITE_DATA;
1184 if (!(mode & S_IXGRP) && (mode & S_IXOTH))
1185 *deny2 |= ACE_EXECUTE;
1186
1187 if ((mode & S_IRUSR) && (!(mode & S_IRGRP) && (mode & S_IROTH)))
1188 *allow0 |= ACE_READ_DATA;
1189 if ((mode & S_IWUSR) && (!(mode & S_IWGRP) && (mode & S_IWOTH)))
1190 *allow0 |= ACE_WRITE_DATA;
1191 if ((mode & S_IXUSR) && (!(mode & S_IXGRP) && (mode & S_IXOTH)))
1192 *allow0 |= ACE_EXECUTE;
1193
1194 *owner = ACE_WRITE_ATTRIBUTES|ACE_WRITE_OWNER|ACE_WRITE_ACL|
1195 ACE_WRITE_NAMED_ATTRS|ACE_READ_ACL|ACE_READ_ATTRIBUTES|
1196 ACE_READ_NAMED_ATTRS|ACE_SYNCHRONIZE;
1197 if (mode & S_IRUSR)
1198 *owner |= ACE_READ_DATA;
1199 if (mode & S_IWUSR)
1200 *owner |= ACE_WRITE_DATA|ACE_APPEND_DATA;
1201 if (mode & S_IXUSR)
1202 *owner |= ACE_EXECUTE;
1203
1204 *group = ACE_READ_ACL|ACE_READ_ATTRIBUTES| ACE_READ_NAMED_ATTRS|
1205 ACE_SYNCHRONIZE;
1206 if (mode & S_IRGRP)
1207 *group |= ACE_READ_DATA;
1208 if (mode & S_IWGRP)
1209 *group |= ACE_WRITE_DATA|ACE_APPEND_DATA;
1210 if (mode & S_IXGRP)
1211 *group |= ACE_EXECUTE;
1212
1213 *everyone = ACE_READ_ACL|ACE_READ_ATTRIBUTES| ACE_READ_NAMED_ATTRS|
1214 ACE_SYNCHRONIZE;
1215 if (mode & S_IROTH)
1216 *everyone |= ACE_READ_DATA;
1217 if (mode & S_IWOTH)
1218 *everyone |= ACE_WRITE_DATA|ACE_APPEND_DATA;
1219 if (mode & S_IXOTH)
1220 *everyone |= ACE_EXECUTE;
1221 }
1222
1223 /*
1224 * ace_trivial:
1225 * determine whether an ace_t acl is trivial
1226 *
1227 * Trivialness implies that the acl is composed of only
1228 * owner, group, everyone entries. ACL can't
1229 * have read_acl denied, and write_owner/write_acl/write_attributes
1230 * can only be owner@ entry.
1231 */
1232 static int
1233 ace_trivial_common(void *acep, int aclcnt,
1234 uint64_t (*walk)(void *, uint64_t, int aclcnt,
1235 uint16_t *, uint16_t *, uint32_t *))
1236 {
1237 uint16_t flags;
1238 uint32_t mask;
1239 uint16_t type;
1240 uint64_t cookie = 0;
1241
1242 while ((cookie = walk(acep, cookie, aclcnt, &flags, &type, &mask))) {
1243 switch (flags & ACE_TYPE_FLAGS) {
1244 case ACE_OWNER:
1245 case ACE_GROUP|ACE_IDENTIFIER_GROUP:
1246 case ACE_EVERYONE:
1247 break;
1248 default:
1249 return (1);
1250 }
1251
1252 if (flags & (ACE_FILE_INHERIT_ACE|
1253 ACE_DIRECTORY_INHERIT_ACE|ACE_NO_PROPAGATE_INHERIT_ACE|
1254 ACE_INHERIT_ONLY_ACE))
1255 return (1);
1256
1257 /*
1258 * Special check for some special bits
1259 *
1260 * Don't allow anybody to deny reading basic
1261 * attributes or a files ACL.
1262 */
1263 if ((mask & (ACE_READ_ACL|ACE_READ_ATTRIBUTES)) &&
1264 (type == ACE_ACCESS_DENIED_ACE_TYPE))
1265 return (1);
1266
1267 /*
1268 * Delete permissions are never set by default
1269 */
1270 if (mask & (ACE_DELETE|ACE_DELETE_CHILD))
1271 return (1);
1272 /*
1273 * only allow owner@ to have
1274 * write_acl/write_owner/write_attributes/write_xattr/
1275 */
1276 if (type == ACE_ACCESS_ALLOWED_ACE_TYPE &&
1277 (!(flags & ACE_OWNER) && (mask &
1278 (ACE_WRITE_OWNER|ACE_WRITE_ACL| ACE_WRITE_ATTRIBUTES|
1279 ACE_WRITE_NAMED_ATTRS))))
1280 return (1);
1281
1282 }
1283
1284 return (0);
1285 }
1286
1287 /*
1288 * common code for setting ACLs.
1289 *
1290 * This function is called from zfs_mode_update, zfs_perm_init, and zfs_setacl.
1291 * zfs_setacl passes a non-NULL inherit pointer (ihp) to indicate that it's
1292 * already checked the acl and knows whether to inherit.
1293 */
1294 int
1295 zfs_aclset_common(znode_t *zp, zfs_acl_t *aclp, cred_t *cr, dmu_tx_t *tx)
1296 {
1297 int error;
1298 zfs_sb_t *zsb = ZTOZSB(zp);
1299 dmu_object_type_t otype;
1300 zfs_acl_locator_cb_t locate = { 0 };
1301 uint64_t mode;
1302 sa_bulk_attr_t bulk[5];
1303 uint64_t ctime[2];
1304 int count = 0;
1305
1306 mode = zp->z_mode;
1307
1308 mode = zfs_mode_compute(mode, aclp, &zp->z_pflags,
1309 zp->z_uid, zp->z_gid);
1310
1311 zp->z_mode = mode;
1312 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zsb), NULL,
1313 &mode, sizeof (mode));
1314 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zsb), NULL,
1315 &zp->z_pflags, sizeof (zp->z_pflags));
1316 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zsb), NULL,
1317 &ctime, sizeof (ctime));
1318
1319 if (zp->z_acl_cached) {
1320 zfs_acl_free(zp->z_acl_cached);
1321 zp->z_acl_cached = NULL;
1322 }
1323
1324 /*
1325 * Upgrade needed?
1326 */
1327 if (!zsb->z_use_fuids) {
1328 otype = DMU_OT_OLDACL;
1329 } else {
1330 if ((aclp->z_version == ZFS_ACL_VERSION_INITIAL) &&
1331 (zsb->z_version >= ZPL_VERSION_FUID))
1332 zfs_acl_xform(zp, aclp, cr);
1333 ASSERT(aclp->z_version >= ZFS_ACL_VERSION_FUID);
1334 otype = DMU_OT_ACL;
1335 }
1336
1337 /*
1338 * Arrgh, we have to handle old on disk format
1339 * as well as newer (preferred) SA format.
1340 */
1341
1342 if (zp->z_is_sa) { /* the easy case, just update the ACL attribute */
1343 locate.cb_aclp = aclp;
1344 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_DACL_ACES(zsb),
1345 zfs_acl_data_locator, &locate, aclp->z_acl_bytes);
1346 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_DACL_COUNT(zsb),
1347 NULL, &aclp->z_acl_count, sizeof (uint64_t));
1348 } else { /* Painful legacy way */
1349 zfs_acl_node_t *aclnode;
1350 uint64_t off = 0;
1351 zfs_acl_phys_t acl_phys;
1352 uint64_t aoid;
1353
1354 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_ZNODE_ACL(zsb),
1355 &acl_phys, sizeof (acl_phys))) != 0)
1356 return (error);
1357
1358 aoid = acl_phys.z_acl_extern_obj;
1359
1360 if (aclp->z_acl_bytes > ZFS_ACE_SPACE) {
1361 /*
1362 * If ACL was previously external and we are now
1363 * converting to new ACL format then release old
1364 * ACL object and create a new one.
1365 */
1366 if (aoid &&
1367 aclp->z_version != acl_phys.z_acl_version) {
1368 error = dmu_object_free(zsb->z_os, aoid, tx);
1369 if (error)
1370 return (error);
1371 aoid = 0;
1372 }
1373 if (aoid == 0) {
1374 aoid = dmu_object_alloc(zsb->z_os,
1375 otype, aclp->z_acl_bytes,
1376 otype == DMU_OT_ACL ?
1377 DMU_OT_SYSACL : DMU_OT_NONE,
1378 otype == DMU_OT_ACL ?
1379 DN_MAX_BONUSLEN : 0, tx);
1380 } else {
1381 (void) dmu_object_set_blocksize(zsb->z_os,
1382 aoid, aclp->z_acl_bytes, 0, tx);
1383 }
1384 acl_phys.z_acl_extern_obj = aoid;
1385 for (aclnode = list_head(&aclp->z_acl); aclnode;
1386 aclnode = list_next(&aclp->z_acl, aclnode)) {
1387 if (aclnode->z_ace_count == 0)
1388 continue;
1389 dmu_write(zsb->z_os, aoid, off,
1390 aclnode->z_size, aclnode->z_acldata, tx);
1391 off += aclnode->z_size;
1392 }
1393 } else {
1394 void *start = acl_phys.z_ace_data;
1395 /*
1396 * Migrating back embedded?
1397 */
1398 if (acl_phys.z_acl_extern_obj) {
1399 error = dmu_object_free(zsb->z_os,
1400 acl_phys.z_acl_extern_obj, tx);
1401 if (error)
1402 return (error);
1403 acl_phys.z_acl_extern_obj = 0;
1404 }
1405
1406 for (aclnode = list_head(&aclp->z_acl); aclnode;
1407 aclnode = list_next(&aclp->z_acl, aclnode)) {
1408 if (aclnode->z_ace_count == 0)
1409 continue;
1410 bcopy(aclnode->z_acldata, start,
1411 aclnode->z_size);
1412 start = (caddr_t)start + aclnode->z_size;
1413 }
1414 }
1415 /*
1416 * If Old version then swap count/bytes to match old
1417 * layout of znode_acl_phys_t.
1418 */
1419 if (aclp->z_version == ZFS_ACL_VERSION_INITIAL) {
1420 acl_phys.z_acl_size = aclp->z_acl_count;
1421 acl_phys.z_acl_count = aclp->z_acl_bytes;
1422 } else {
1423 acl_phys.z_acl_size = aclp->z_acl_bytes;
1424 acl_phys.z_acl_count = aclp->z_acl_count;
1425 }
1426 acl_phys.z_acl_version = aclp->z_version;
1427
1428 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ZNODE_ACL(zsb), NULL,
1429 &acl_phys, sizeof (acl_phys));
1430 }
1431
1432 /*
1433 * Replace ACL wide bits, but first clear them.
1434 */
1435 zp->z_pflags &= ~ZFS_ACL_WIDE_FLAGS;
1436
1437 zp->z_pflags |= aclp->z_hints;
1438
1439 if (ace_trivial_common(aclp, 0, zfs_ace_walk) == 0)
1440 zp->z_pflags |= ZFS_ACL_TRIVIAL;
1441
1442 zfs_tstamp_update_setup(zp, STATE_CHANGED, NULL, ctime, B_TRUE);
1443 return (sa_bulk_update(zp->z_sa_hdl, bulk, count, tx));
1444 }
1445
1446 static void
1447 zfs_acl_chmod(zfs_sb_t *zsb, uint64_t mode, zfs_acl_t *aclp)
1448 {
1449 void *acep = NULL;
1450 uint64_t who;
1451 int new_count, new_bytes;
1452 int ace_size;
1453 int entry_type;
1454 uint16_t iflags, type;
1455 uint32_t access_mask;
1456 zfs_acl_node_t *newnode;
1457 size_t abstract_size = aclp->z_ops.ace_abstract_size();
1458 void *zacep;
1459 uint32_t owner, group, everyone;
1460 uint32_t deny1, deny2, allow0;
1461
1462 new_count = new_bytes = 0;
1463
1464 acl_trivial_access_masks((mode_t)mode, &allow0, &deny1, &deny2,
1465 &owner, &group, &everyone);
1466
1467 newnode = zfs_acl_node_alloc((abstract_size * 6) + aclp->z_acl_bytes);
1468
1469 zacep = newnode->z_acldata;
1470 if (allow0) {
1471 zfs_set_ace(aclp, zacep, allow0, ALLOW, -1, ACE_OWNER);
1472 zacep = (void *)((uintptr_t)zacep + abstract_size);
1473 new_count++;
1474 new_bytes += abstract_size;
1475 } if (deny1) {
1476 zfs_set_ace(aclp, zacep, deny1, DENY, -1, ACE_OWNER);
1477 zacep = (void *)((uintptr_t)zacep + abstract_size);
1478 new_count++;
1479 new_bytes += abstract_size;
1480 }
1481 if (deny2) {
1482 zfs_set_ace(aclp, zacep, deny2, DENY, -1, OWNING_GROUP);
1483 zacep = (void *)((uintptr_t)zacep + abstract_size);
1484 new_count++;
1485 new_bytes += abstract_size;
1486 }
1487
1488 while ((acep = zfs_acl_next_ace(aclp, acep, &who, &access_mask,
1489 &iflags, &type))) {
1490 uint16_t inherit_flags;
1491
1492 entry_type = (iflags & ACE_TYPE_FLAGS);
1493 inherit_flags = (iflags & ALL_INHERIT);
1494
1495 if ((entry_type == ACE_OWNER || entry_type == ACE_EVERYONE ||
1496 (entry_type == OWNING_GROUP)) &&
1497 ((inherit_flags & ACE_INHERIT_ONLY_ACE) == 0)) {
1498 continue;
1499 }
1500
1501 if ((type != ALLOW && type != DENY) ||
1502 (inherit_flags & ACE_INHERIT_ONLY_ACE)) {
1503 if (inherit_flags)
1504 aclp->z_hints |= ZFS_INHERIT_ACE;
1505 switch (type) {
1506 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
1507 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
1508 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
1509 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
1510 aclp->z_hints |= ZFS_ACL_OBJ_ACE;
1511 break;
1512 }
1513 } else {
1514
1515 /*
1516 * Limit permissions to be no greater than
1517 * group permissions
1518 */
1519 if (zsb->z_acl_inherit == ZFS_ACL_RESTRICTED) {
1520 if (!(mode & S_IRGRP))
1521 access_mask &= ~ACE_READ_DATA;
1522 if (!(mode & S_IWGRP))
1523 access_mask &=
1524 ~(ACE_WRITE_DATA|ACE_APPEND_DATA);
1525 if (!(mode & S_IXGRP))
1526 access_mask &= ~ACE_EXECUTE;
1527 access_mask &=
1528 ~(ACE_WRITE_OWNER|ACE_WRITE_ACL|
1529 ACE_WRITE_ATTRIBUTES|ACE_WRITE_NAMED_ATTRS);
1530 }
1531 }
1532 zfs_set_ace(aclp, zacep, access_mask, type, who, iflags);
1533 ace_size = aclp->z_ops.ace_size(acep);
1534 zacep = (void *)((uintptr_t)zacep + ace_size);
1535 new_count++;
1536 new_bytes += ace_size;
1537 }
1538 zfs_set_ace(aclp, zacep, owner, 0, -1, ACE_OWNER);
1539 zacep = (void *)((uintptr_t)zacep + abstract_size);
1540 zfs_set_ace(aclp, zacep, group, 0, -1, OWNING_GROUP);
1541 zacep = (void *)((uintptr_t)zacep + abstract_size);
1542 zfs_set_ace(aclp, zacep, everyone, 0, -1, ACE_EVERYONE);
1543
1544 new_count += 3;
1545 new_bytes += abstract_size * 3;
1546 zfs_acl_release_nodes(aclp);
1547 aclp->z_acl_count = new_count;
1548 aclp->z_acl_bytes = new_bytes;
1549 newnode->z_ace_count = new_count;
1550 newnode->z_size = new_bytes;
1551 list_insert_tail(&aclp->z_acl, newnode);
1552 }
1553
1554 void
1555 zfs_acl_chmod_setattr(znode_t *zp, zfs_acl_t **aclp, uint64_t mode)
1556 {
1557 mutex_enter(&zp->z_acl_lock);
1558 mutex_enter(&zp->z_lock);
1559 *aclp = zfs_acl_alloc(zfs_acl_version_zp(zp));
1560 (*aclp)->z_hints = zp->z_pflags & V4_ACL_WIDE_FLAGS;
1561 zfs_acl_chmod(ZTOZSB(zp), mode, *aclp);
1562 mutex_exit(&zp->z_lock);
1563 mutex_exit(&zp->z_acl_lock);
1564 ASSERT(*aclp);
1565 }
1566
1567 /*
1568 * strip off write_owner and write_acl
1569 */
1570 static void
1571 zfs_restricted_update(zfs_sb_t *zsb, zfs_acl_t *aclp, void *acep)
1572 {
1573 uint32_t mask = aclp->z_ops.ace_mask_get(acep);
1574
1575 if ((zsb->z_acl_inherit == ZFS_ACL_RESTRICTED) &&
1576 (aclp->z_ops.ace_type_get(acep) == ALLOW)) {
1577 mask &= ~RESTRICTED_CLEAR;
1578 aclp->z_ops.ace_mask_set(acep, mask);
1579 }
1580 }
1581
1582 /*
1583 * Should ACE be inherited?
1584 */
1585 static int
1586 zfs_ace_can_use(umode_t obj_mode, uint16_t acep_flags)
1587 {
1588 int iflags = (acep_flags & 0xf);
1589
1590 if (S_ISDIR(obj_mode) && (iflags & ACE_DIRECTORY_INHERIT_ACE))
1591 return (1);
1592 else if (iflags & ACE_FILE_INHERIT_ACE)
1593 return (!(S_ISDIR(obj_mode) &&
1594 (iflags & ACE_NO_PROPAGATE_INHERIT_ACE)));
1595 return (0);
1596 }
1597
1598 /*
1599 * inherit inheritable ACEs from parent
1600 */
1601 static zfs_acl_t *
1602 zfs_acl_inherit(zfs_sb_t *zsb, umode_t obj_mode, zfs_acl_t *paclp,
1603 uint64_t mode, boolean_t *need_chmod)
1604 {
1605 void *pacep;
1606 void *acep;
1607 zfs_acl_node_t *aclnode;
1608 zfs_acl_t *aclp = NULL;
1609 uint64_t who;
1610 uint32_t access_mask;
1611 uint16_t iflags, newflags, type;
1612 size_t ace_size;
1613 void *data1, *data2;
1614 size_t data1sz, data2sz;
1615 boolean_t vdir = S_ISDIR(obj_mode);
1616 boolean_t vreg = S_ISREG(obj_mode);
1617 boolean_t passthrough, passthrough_x, noallow;
1618
1619 passthrough_x =
1620 zsb->z_acl_inherit == ZFS_ACL_PASSTHROUGH_X;
1621 passthrough = passthrough_x ||
1622 zsb->z_acl_inherit == ZFS_ACL_PASSTHROUGH;
1623 noallow =
1624 zsb->z_acl_inherit == ZFS_ACL_NOALLOW;
1625
1626 *need_chmod = B_TRUE;
1627 pacep = NULL;
1628 aclp = zfs_acl_alloc(paclp->z_version);
1629 if (zsb->z_acl_inherit == ZFS_ACL_DISCARD || S_ISLNK(obj_mode))
1630 return (aclp);
1631 while ((pacep = zfs_acl_next_ace(paclp, pacep, &who,
1632 &access_mask, &iflags, &type))) {
1633
1634 /*
1635 * don't inherit bogus ACEs
1636 */
1637 if (!zfs_acl_valid_ace_type(type, iflags))
1638 continue;
1639
1640 if (noallow && type == ALLOW)
1641 continue;
1642
1643 ace_size = aclp->z_ops.ace_size(pacep);
1644
1645 if (!zfs_ace_can_use(obj_mode, iflags))
1646 continue;
1647
1648 /*
1649 * If owner@, group@, or everyone@ inheritable
1650 * then zfs_acl_chmod() isn't needed.
1651 */
1652 if (passthrough &&
1653 ((iflags & (ACE_OWNER|ACE_EVERYONE)) ||
1654 ((iflags & OWNING_GROUP) ==
1655 OWNING_GROUP)) && (vreg || (vdir && (iflags &
1656 ACE_DIRECTORY_INHERIT_ACE)))) {
1657 *need_chmod = B_FALSE;
1658 }
1659
1660 if (!vdir && passthrough_x &&
1661 ((mode & (S_IXUSR | S_IXGRP | S_IXOTH)) == 0)) {
1662 access_mask &= ~ACE_EXECUTE;
1663 }
1664
1665 aclnode = zfs_acl_node_alloc(ace_size);
1666 list_insert_tail(&aclp->z_acl, aclnode);
1667 acep = aclnode->z_acldata;
1668
1669 zfs_set_ace(aclp, acep, access_mask, type,
1670 who, iflags|ACE_INHERITED_ACE);
1671
1672 /*
1673 * Copy special opaque data if any
1674 */
1675 if ((data1sz = paclp->z_ops.ace_data(pacep, &data1)) != 0) {
1676 VERIFY((data2sz = aclp->z_ops.ace_data(acep,
1677 &data2)) == data1sz);
1678 bcopy(data1, data2, data2sz);
1679 }
1680
1681 aclp->z_acl_count++;
1682 aclnode->z_ace_count++;
1683 aclp->z_acl_bytes += aclnode->z_size;
1684 newflags = aclp->z_ops.ace_flags_get(acep);
1685
1686 if (vdir)
1687 aclp->z_hints |= ZFS_INHERIT_ACE;
1688
1689 if ((iflags & ACE_NO_PROPAGATE_INHERIT_ACE) || !vdir) {
1690 newflags &= ~ALL_INHERIT;
1691 aclp->z_ops.ace_flags_set(acep,
1692 newflags|ACE_INHERITED_ACE);
1693 zfs_restricted_update(zsb, aclp, acep);
1694 continue;
1695 }
1696
1697 ASSERT(vdir);
1698
1699 /*
1700 * If only FILE_INHERIT is set then turn on
1701 * inherit_only
1702 */
1703 if ((iflags & (ACE_FILE_INHERIT_ACE |
1704 ACE_DIRECTORY_INHERIT_ACE)) == ACE_FILE_INHERIT_ACE) {
1705 newflags |= ACE_INHERIT_ONLY_ACE;
1706 aclp->z_ops.ace_flags_set(acep,
1707 newflags|ACE_INHERITED_ACE);
1708 } else {
1709 newflags &= ~ACE_INHERIT_ONLY_ACE;
1710 aclp->z_ops.ace_flags_set(acep,
1711 newflags|ACE_INHERITED_ACE);
1712 }
1713 }
1714 return (aclp);
1715 }
1716
1717 /*
1718 * Create file system object initial permissions
1719 * including inheritable ACEs.
1720 */
1721 int
1722 zfs_acl_ids_create(znode_t *dzp, int flag, vattr_t *vap, cred_t *cr,
1723 vsecattr_t *vsecp, zfs_acl_ids_t *acl_ids)
1724 {
1725 int error;
1726 zfs_sb_t *zsb = ZTOZSB(dzp);
1727 zfs_acl_t *paclp;
1728 #ifdef HAVE_KSID
1729 gid_t gid;
1730 #endif /* HAVE_KSID */
1731 boolean_t need_chmod = B_TRUE;
1732 boolean_t inherited = B_FALSE;
1733
1734 bzero(acl_ids, sizeof (zfs_acl_ids_t));
1735 acl_ids->z_mode = vap->va_mode;
1736
1737 if (vsecp)
1738 if ((error = zfs_vsec_2_aclp(zsb, vap->va_mode, vsecp,
1739 cr, &acl_ids->z_fuidp, &acl_ids->z_aclp)) != 0)
1740 return (error);
1741
1742 acl_ids->z_fuid = vap->va_uid;
1743 acl_ids->z_fgid = vap->va_gid;
1744 #ifdef HAVE_KSID
1745 /*
1746 * Determine uid and gid.
1747 */
1748 if ((flag & IS_ROOT_NODE) || zsb->z_replay ||
1749 ((flag & IS_XATTR) && (S_ISDIR(vap->va_mode)))) {
1750 acl_ids->z_fuid = zfs_fuid_create(zsb, (uint64_t)vap->va_uid,
1751 cr, ZFS_OWNER, &acl_ids->z_fuidp);
1752 acl_ids->z_fgid = zfs_fuid_create(zsb, (uint64_t)vap->va_gid,
1753 cr, ZFS_GROUP, &acl_ids->z_fuidp);
1754 gid = vap->va_gid;
1755 } else {
1756 acl_ids->z_fuid = zfs_fuid_create_cred(zsb, ZFS_OWNER,
1757 cr, &acl_ids->z_fuidp);
1758 acl_ids->z_fgid = 0;
1759 if (vap->va_mask & AT_GID) {
1760 acl_ids->z_fgid = zfs_fuid_create(zsb,
1761 (uint64_t)vap->va_gid,
1762 cr, ZFS_GROUP, &acl_ids->z_fuidp);
1763 gid = vap->va_gid;
1764 if (acl_ids->z_fgid != dzp->z_gid &&
1765 !groupmember(vap->va_gid, cr) &&
1766 secpolicy_vnode_create_gid(cr) != 0)
1767 acl_ids->z_fgid = 0;
1768 }
1769 if (acl_ids->z_fgid == 0) {
1770 if (dzp->z_mode & S_ISGID) {
1771 char *domain;
1772 uint32_t rid;
1773
1774 acl_ids->z_fgid = dzp->z_gid;
1775 gid = zfs_fuid_map_id(zsb, acl_ids->z_fgid,
1776 cr, ZFS_GROUP);
1777
1778 if (zsb->z_use_fuids &&
1779 IS_EPHEMERAL(acl_ids->z_fgid)) {
1780 domain = zfs_fuid_idx_domain(
1781 &zsb->z_fuid_idx,
1782 FUID_INDEX(acl_ids->z_fgid));
1783 rid = FUID_RID(acl_ids->z_fgid);
1784 zfs_fuid_node_add(&acl_ids->z_fuidp,
1785 domain, rid,
1786 FUID_INDEX(acl_ids->z_fgid),
1787 acl_ids->z_fgid, ZFS_GROUP);
1788 }
1789 } else {
1790 acl_ids->z_fgid = zfs_fuid_create_cred(zsb,
1791 ZFS_GROUP, cr, &acl_ids->z_fuidp);
1792 gid = crgetgid(cr);
1793 }
1794 }
1795 }
1796 #endif /* HAVE_KSID */
1797
1798 /*
1799 * If we're creating a directory, and the parent directory has the
1800 * set-GID bit set, set in on the new directory.
1801 * Otherwise, if the user is neither privileged nor a member of the
1802 * file's new group, clear the file's set-GID bit.
1803 */
1804
1805 if (!(flag & IS_ROOT_NODE) && (dzp->z_mode & S_ISGID) &&
1806 (S_ISDIR(vap->va_mode))) {
1807 acl_ids->z_mode |= S_ISGID;
1808 } else {
1809 if ((acl_ids->z_mode & S_ISGID) &&
1810 secpolicy_vnode_setids_setgids(cr, gid) != 0)
1811 acl_ids->z_mode &= ~S_ISGID;
1812 }
1813
1814 if (acl_ids->z_aclp == NULL) {
1815 mutex_enter(&dzp->z_acl_lock);
1816 mutex_enter(&dzp->z_lock);
1817 if (!(flag & IS_ROOT_NODE) && (S_ISDIR(ZTOI(dzp)->i_mode) &&
1818 (dzp->z_pflags & ZFS_INHERIT_ACE)) &&
1819 !(dzp->z_pflags & ZFS_XATTR)) {
1820 VERIFY(0 == zfs_acl_node_read(dzp, B_TRUE,
1821 &paclp, B_FALSE));
1822 acl_ids->z_aclp = zfs_acl_inherit(zsb,
1823 vap->va_mode, paclp, acl_ids->z_mode, &need_chmod);
1824 inherited = B_TRUE;
1825 } else {
1826 acl_ids->z_aclp =
1827 zfs_acl_alloc(zfs_acl_version_zp(dzp));
1828 acl_ids->z_aclp->z_hints |= ZFS_ACL_TRIVIAL;
1829 }
1830 mutex_exit(&dzp->z_lock);
1831 mutex_exit(&dzp->z_acl_lock);
1832 if (need_chmod) {
1833 acl_ids->z_aclp->z_hints |= S_ISDIR(vap->va_mode) ?
1834 ZFS_ACL_AUTO_INHERIT : 0;
1835 zfs_acl_chmod(zsb, acl_ids->z_mode, acl_ids->z_aclp);
1836 }
1837 }
1838
1839 if (inherited || vsecp) {
1840 acl_ids->z_mode = zfs_mode_compute(acl_ids->z_mode,
1841 acl_ids->z_aclp, &acl_ids->z_aclp->z_hints,
1842 acl_ids->z_fuid, acl_ids->z_fgid);
1843 if (ace_trivial_common(acl_ids->z_aclp, 0, zfs_ace_walk) == 0)
1844 acl_ids->z_aclp->z_hints |= ZFS_ACL_TRIVIAL;
1845 }
1846
1847 return (0);
1848 }
1849
1850 /*
1851 * Free ACL and fuid_infop, but not the acl_ids structure
1852 */
1853 void
1854 zfs_acl_ids_free(zfs_acl_ids_t *acl_ids)
1855 {
1856 if (acl_ids->z_aclp)
1857 zfs_acl_free(acl_ids->z_aclp);
1858 if (acl_ids->z_fuidp)
1859 zfs_fuid_info_free(acl_ids->z_fuidp);
1860 acl_ids->z_aclp = NULL;
1861 acl_ids->z_fuidp = NULL;
1862 }
1863
1864 boolean_t
1865 zfs_acl_ids_overquota(zfs_sb_t *zsb, zfs_acl_ids_t *acl_ids)
1866 {
1867 return (zfs_fuid_overquota(zsb, B_FALSE, acl_ids->z_fuid) ||
1868 zfs_fuid_overquota(zsb, B_TRUE, acl_ids->z_fgid));
1869 }
1870
1871 /*
1872 * Retrieve a files ACL
1873 */
1874 int
1875 zfs_getacl(znode_t *zp, vsecattr_t *vsecp, boolean_t skipaclchk, cred_t *cr)
1876 {
1877 zfs_acl_t *aclp;
1878 ulong_t mask;
1879 int error;
1880 int count = 0;
1881 int largeace = 0;
1882
1883 mask = vsecp->vsa_mask & (VSA_ACE | VSA_ACECNT |
1884 VSA_ACE_ACLFLAGS | VSA_ACE_ALLTYPES);
1885
1886 if (mask == 0)
1887 return (ENOSYS);
1888
1889 if ((error = zfs_zaccess(zp, ACE_READ_ACL, 0, skipaclchk, cr)))
1890 return (error);
1891
1892 mutex_enter(&zp->z_acl_lock);
1893
1894 error = zfs_acl_node_read(zp, B_FALSE, &aclp, B_FALSE);
1895 if (error != 0) {
1896 mutex_exit(&zp->z_acl_lock);
1897 return (error);
1898 }
1899
1900 /*
1901 * Scan ACL to determine number of ACEs
1902 */
1903 if ((zp->z_pflags & ZFS_ACL_OBJ_ACE) && !(mask & VSA_ACE_ALLTYPES)) {
1904 void *zacep = NULL;
1905 uint64_t who;
1906 uint32_t access_mask;
1907 uint16_t type, iflags;
1908
1909 while ((zacep = zfs_acl_next_ace(aclp, zacep,
1910 &who, &access_mask, &iflags, &type))) {
1911 switch (type) {
1912 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
1913 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
1914 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
1915 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
1916 largeace++;
1917 continue;
1918 default:
1919 count++;
1920 }
1921 }
1922 vsecp->vsa_aclcnt = count;
1923 } else
1924 count = (int)aclp->z_acl_count;
1925
1926 if (mask & VSA_ACECNT) {
1927 vsecp->vsa_aclcnt = count;
1928 }
1929
1930 if (mask & VSA_ACE) {
1931 size_t aclsz;
1932
1933 aclsz = count * sizeof (ace_t) +
1934 sizeof (ace_object_t) * largeace;
1935
1936 vsecp->vsa_aclentp = kmem_alloc(aclsz, KM_SLEEP);
1937 vsecp->vsa_aclentsz = aclsz;
1938
1939 if (aclp->z_version == ZFS_ACL_VERSION_FUID)
1940 zfs_copy_fuid_2_ace(ZTOZSB(zp), aclp, cr,
1941 vsecp->vsa_aclentp, !(mask & VSA_ACE_ALLTYPES));
1942 else {
1943 zfs_acl_node_t *aclnode;
1944 void *start = vsecp->vsa_aclentp;
1945
1946 for (aclnode = list_head(&aclp->z_acl); aclnode;
1947 aclnode = list_next(&aclp->z_acl, aclnode)) {
1948 bcopy(aclnode->z_acldata, start,
1949 aclnode->z_size);
1950 start = (caddr_t)start + aclnode->z_size;
1951 }
1952 ASSERT((caddr_t)start - (caddr_t)vsecp->vsa_aclentp ==
1953 aclp->z_acl_bytes);
1954 }
1955 }
1956 if (mask & VSA_ACE_ACLFLAGS) {
1957 vsecp->vsa_aclflags = 0;
1958 if (zp->z_pflags & ZFS_ACL_DEFAULTED)
1959 vsecp->vsa_aclflags |= ACL_DEFAULTED;
1960 if (zp->z_pflags & ZFS_ACL_PROTECTED)
1961 vsecp->vsa_aclflags |= ACL_PROTECTED;
1962 if (zp->z_pflags & ZFS_ACL_AUTO_INHERIT)
1963 vsecp->vsa_aclflags |= ACL_AUTO_INHERIT;
1964 }
1965
1966 mutex_exit(&zp->z_acl_lock);
1967
1968 return (0);
1969 }
1970
1971 int
1972 zfs_vsec_2_aclp(zfs_sb_t *zsb, umode_t obj_mode,
1973 vsecattr_t *vsecp, cred_t *cr, zfs_fuid_info_t **fuidp, zfs_acl_t **zaclp)
1974 {
1975 zfs_acl_t *aclp;
1976 zfs_acl_node_t *aclnode;
1977 int aclcnt = vsecp->vsa_aclcnt;
1978 int error;
1979
1980 if (vsecp->vsa_aclcnt > MAX_ACL_ENTRIES || vsecp->vsa_aclcnt <= 0)
1981 return (EINVAL);
1982
1983 aclp = zfs_acl_alloc(zfs_acl_version(zsb->z_version));
1984
1985 aclp->z_hints = 0;
1986 aclnode = zfs_acl_node_alloc(aclcnt * sizeof (zfs_object_ace_t));
1987 if (aclp->z_version == ZFS_ACL_VERSION_INITIAL) {
1988 if ((error = zfs_copy_ace_2_oldace(obj_mode, aclp,
1989 (ace_t *)vsecp->vsa_aclentp, aclnode->z_acldata,
1990 aclcnt, &aclnode->z_size)) != 0) {
1991 zfs_acl_free(aclp);
1992 zfs_acl_node_free(aclnode);
1993 return (error);
1994 }
1995 } else {
1996 if ((error = zfs_copy_ace_2_fuid(zsb, obj_mode, aclp,
1997 vsecp->vsa_aclentp, aclnode->z_acldata, aclcnt,
1998 &aclnode->z_size, fuidp, cr)) != 0) {
1999 zfs_acl_free(aclp);
2000 zfs_acl_node_free(aclnode);
2001 return (error);
2002 }
2003 }
2004 aclp->z_acl_bytes = aclnode->z_size;
2005 aclnode->z_ace_count = aclcnt;
2006 aclp->z_acl_count = aclcnt;
2007 list_insert_head(&aclp->z_acl, aclnode);
2008
2009 /*
2010 * If flags are being set then add them to z_hints
2011 */
2012 if (vsecp->vsa_mask & VSA_ACE_ACLFLAGS) {
2013 if (vsecp->vsa_aclflags & ACL_PROTECTED)
2014 aclp->z_hints |= ZFS_ACL_PROTECTED;
2015 if (vsecp->vsa_aclflags & ACL_DEFAULTED)
2016 aclp->z_hints |= ZFS_ACL_DEFAULTED;
2017 if (vsecp->vsa_aclflags & ACL_AUTO_INHERIT)
2018 aclp->z_hints |= ZFS_ACL_AUTO_INHERIT;
2019 }
2020
2021 *zaclp = aclp;
2022
2023 return (0);
2024 }
2025
2026 /*
2027 * Set a files ACL
2028 */
2029 int
2030 zfs_setacl(znode_t *zp, vsecattr_t *vsecp, boolean_t skipaclchk, cred_t *cr)
2031 {
2032 zfs_sb_t *zsb = ZTOZSB(zp);
2033 zilog_t *zilog = zsb->z_log;
2034 ulong_t mask = vsecp->vsa_mask & (VSA_ACE | VSA_ACECNT);
2035 dmu_tx_t *tx;
2036 int error;
2037 zfs_acl_t *aclp;
2038 zfs_fuid_info_t *fuidp = NULL;
2039 boolean_t fuid_dirtied;
2040 uint64_t acl_obj;
2041
2042 if (mask == 0)
2043 return (ENOSYS);
2044
2045 if (zp->z_pflags & ZFS_IMMUTABLE)
2046 return (EPERM);
2047
2048 if ((error = zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr)))
2049 return (error);
2050
2051 error = zfs_vsec_2_aclp(zsb, ZTOI(zp)->i_mode, vsecp, cr, &fuidp,
2052 &aclp);
2053 if (error)
2054 return (error);
2055
2056 /*
2057 * If ACL wide flags aren't being set then preserve any
2058 * existing flags.
2059 */
2060 if (!(vsecp->vsa_mask & VSA_ACE_ACLFLAGS)) {
2061 aclp->z_hints |=
2062 (zp->z_pflags & V4_ACL_WIDE_FLAGS);
2063 }
2064 top:
2065 mutex_enter(&zp->z_acl_lock);
2066 mutex_enter(&zp->z_lock);
2067
2068 tx = dmu_tx_create(zsb->z_os);
2069
2070 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
2071
2072 fuid_dirtied = zsb->z_fuid_dirty;
2073 if (fuid_dirtied)
2074 zfs_fuid_txhold(zsb, tx);
2075
2076 /*
2077 * If old version and ACL won't fit in bonus and we aren't
2078 * upgrading then take out necessary DMU holds
2079 */
2080
2081 if ((acl_obj = zfs_external_acl(zp)) != 0) {
2082 if (zsb->z_version >= ZPL_VERSION_FUID &&
2083 zfs_znode_acl_version(zp) <= ZFS_ACL_VERSION_INITIAL) {
2084 dmu_tx_hold_free(tx, acl_obj, 0,
2085 DMU_OBJECT_END);
2086 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0,
2087 aclp->z_acl_bytes);
2088 } else {
2089 dmu_tx_hold_write(tx, acl_obj, 0, aclp->z_acl_bytes);
2090 }
2091 } else if (!zp->z_is_sa && aclp->z_acl_bytes > ZFS_ACE_SPACE) {
2092 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, aclp->z_acl_bytes);
2093 }
2094
2095 zfs_sa_upgrade_txholds(tx, zp);
2096 error = dmu_tx_assign(tx, TXG_NOWAIT);
2097 if (error) {
2098 mutex_exit(&zp->z_acl_lock);
2099 mutex_exit(&zp->z_lock);
2100
2101 if (error == ERESTART) {
2102 dmu_tx_wait(tx);
2103 dmu_tx_abort(tx);
2104 goto top;
2105 }
2106 dmu_tx_abort(tx);
2107 zfs_acl_free(aclp);
2108 return (error);
2109 }
2110
2111 error = zfs_aclset_common(zp, aclp, cr, tx);
2112 ASSERT(error == 0);
2113 ASSERT(zp->z_acl_cached == NULL);
2114 zp->z_acl_cached = aclp;
2115
2116 if (fuid_dirtied)
2117 zfs_fuid_sync(zsb, tx);
2118
2119 zfs_log_acl(zilog, tx, zp, vsecp, fuidp);
2120
2121 if (fuidp)
2122 zfs_fuid_info_free(fuidp);
2123 dmu_tx_commit(tx);
2124
2125 mutex_exit(&zp->z_lock);
2126 mutex_exit(&zp->z_acl_lock);
2127
2128 return (error);
2129 }
2130
2131 /*
2132 * Check accesses of interest (AoI) against attributes of the dataset
2133 * such as read-only. Returns zero if no AoI conflict with dataset
2134 * attributes, otherwise an appropriate errno is returned.
2135 */
2136 static int
2137 zfs_zaccess_dataset_check(znode_t *zp, uint32_t v4_mode)
2138 {
2139 if ((v4_mode & WRITE_MASK) &&
2140 (ZTOZSB(zp)->z_vfs->mnt_flags & MNT_READONLY) &&
2141 (!S_ISDEV(ZTOI(zp)->i_mode) ||
2142 (S_ISDEV(ZTOI(zp)->i_mode) && (v4_mode & WRITE_MASK_ATTRS)))) {
2143 return (EROFS);
2144 }
2145
2146 /*
2147 * Only check for READONLY on non-directories.
2148 */
2149 if ((v4_mode & WRITE_MASK_DATA) &&
2150 ((!S_ISDIR(ZTOI(zp)->i_mode) &&
2151 (zp->z_pflags & (ZFS_READONLY | ZFS_IMMUTABLE))) ||
2152 (S_ISDIR(ZTOI(zp)->i_mode) &&
2153 (zp->z_pflags & ZFS_IMMUTABLE)))) {
2154 return (EPERM);
2155 }
2156
2157 if ((v4_mode & (ACE_DELETE | ACE_DELETE_CHILD)) &&
2158 (zp->z_pflags & ZFS_NOUNLINK)) {
2159 return (EPERM);
2160 }
2161
2162 if (((v4_mode & (ACE_READ_DATA|ACE_EXECUTE)) &&
2163 (zp->z_pflags & ZFS_AV_QUARANTINED))) {
2164 return (EACCES);
2165 }
2166
2167 return (0);
2168 }
2169
2170 /*
2171 * The primary usage of this function is to loop through all of the
2172 * ACEs in the znode, determining what accesses of interest (AoI) to
2173 * the caller are allowed or denied. The AoI are expressed as bits in
2174 * the working_mode parameter. As each ACE is processed, bits covered
2175 * by that ACE are removed from the working_mode. This removal
2176 * facilitates two things. The first is that when the working mode is
2177 * empty (= 0), we know we've looked at all the AoI. The second is
2178 * that the ACE interpretation rules don't allow a later ACE to undo
2179 * something granted or denied by an earlier ACE. Removing the
2180 * discovered access or denial enforces this rule. At the end of
2181 * processing the ACEs, all AoI that were found to be denied are
2182 * placed into the working_mode, giving the caller a mask of denied
2183 * accesses. Returns:
2184 * 0 if all AoI granted
2185 * EACCESS if the denied mask is non-zero
2186 * other error if abnormal failure (e.g., IO error)
2187 *
2188 * A secondary usage of the function is to determine if any of the
2189 * AoI are granted. If an ACE grants any access in
2190 * the working_mode, we immediately short circuit out of the function.
2191 * This mode is chosen by setting anyaccess to B_TRUE. The
2192 * working_mode is not a denied access mask upon exit if the function
2193 * is used in this manner.
2194 */
2195 static int
2196 zfs_zaccess_aces_check(znode_t *zp, uint32_t *working_mode,
2197 boolean_t anyaccess, cred_t *cr)
2198 {
2199 zfs_sb_t *zsb = ZTOZSB(zp);
2200 zfs_acl_t *aclp;
2201 int error;
2202 uid_t uid = crgetuid(cr);
2203 uint64_t who;
2204 uint16_t type, iflags;
2205 uint16_t entry_type;
2206 uint32_t access_mask;
2207 uint32_t deny_mask = 0;
2208 zfs_ace_hdr_t *acep = NULL;
2209 boolean_t checkit;
2210 uid_t gowner;
2211 uid_t fowner;
2212
2213 zfs_fuid_map_ids(zp, cr, &fowner, &gowner);
2214
2215 mutex_enter(&zp->z_acl_lock);
2216
2217 error = zfs_acl_node_read(zp, B_FALSE, &aclp, B_FALSE);
2218 if (error != 0) {
2219 mutex_exit(&zp->z_acl_lock);
2220 return (error);
2221 }
2222
2223 ASSERT(zp->z_acl_cached);
2224
2225 while ((acep = zfs_acl_next_ace(aclp, acep, &who, &access_mask,
2226 &iflags, &type))) {
2227 uint32_t mask_matched;
2228
2229 if (!zfs_acl_valid_ace_type(type, iflags))
2230 continue;
2231
2232 if (S_ISDIR(ZTOI(zp)->i_mode) &&
2233 (iflags & ACE_INHERIT_ONLY_ACE))
2234 continue;
2235
2236 /* Skip ACE if it does not affect any AoI */
2237 mask_matched = (access_mask & *working_mode);
2238 if (!mask_matched)
2239 continue;
2240
2241 entry_type = (iflags & ACE_TYPE_FLAGS);
2242
2243 checkit = B_FALSE;
2244
2245 switch (entry_type) {
2246 case ACE_OWNER:
2247 if (uid == fowner)
2248 checkit = B_TRUE;
2249 break;
2250 case OWNING_GROUP:
2251 who = gowner;
2252 /*FALLTHROUGH*/
2253 case ACE_IDENTIFIER_GROUP:
2254 checkit = zfs_groupmember(zsb, who, cr);
2255 break;
2256 case ACE_EVERYONE:
2257 checkit = B_TRUE;
2258 break;
2259
2260 /* USER Entry */
2261 default:
2262 if (entry_type == 0) {
2263 uid_t newid;
2264
2265 newid = zfs_fuid_map_id(zsb, who, cr,
2266 ZFS_ACE_USER);
2267 if (newid != IDMAP_WK_CREATOR_OWNER_UID &&
2268 uid == newid)
2269 checkit = B_TRUE;
2270 break;
2271 } else {
2272 mutex_exit(&zp->z_acl_lock);
2273 return (EIO);
2274 }
2275 }
2276
2277 if (checkit) {
2278 if (type == DENY) {
2279 DTRACE_PROBE3(zfs__ace__denies,
2280 znode_t *, zp,
2281 zfs_ace_hdr_t *, acep,
2282 uint32_t, mask_matched);
2283 deny_mask |= mask_matched;
2284 } else {
2285 DTRACE_PROBE3(zfs__ace__allows,
2286 znode_t *, zp,
2287 zfs_ace_hdr_t *, acep,
2288 uint32_t, mask_matched);
2289 if (anyaccess) {
2290 mutex_exit(&zp->z_acl_lock);
2291 return (0);
2292 }
2293 }
2294 *working_mode &= ~mask_matched;
2295 }
2296
2297 /* Are we done? */
2298 if (*working_mode == 0)
2299 break;
2300 }
2301
2302 mutex_exit(&zp->z_acl_lock);
2303
2304 /* Put the found 'denies' back on the working mode */
2305 if (deny_mask) {
2306 *working_mode |= deny_mask;
2307 return (EACCES);
2308 } else if (*working_mode) {
2309 return (-1);
2310 }
2311
2312 return (0);
2313 }
2314
2315 /*
2316 * Return true if any access whatsoever granted, we don't actually
2317 * care what access is granted.
2318 */
2319 boolean_t
2320 zfs_has_access(znode_t *zp, cred_t *cr)
2321 {
2322 uint32_t have = ACE_ALL_PERMS;
2323
2324 if (zfs_zaccess_aces_check(zp, &have, B_TRUE, cr) != 0) {
2325 uid_t owner;
2326
2327 owner = zfs_fuid_map_id(ZTOZSB(zp), zp->z_uid, cr, ZFS_OWNER);
2328 return (secpolicy_vnode_any_access(cr, ZTOI(zp), owner) == 0);
2329 }
2330 return (B_TRUE);
2331 }
2332
2333 static int
2334 zfs_zaccess_common(znode_t *zp, uint32_t v4_mode, uint32_t *working_mode,
2335 boolean_t *check_privs, boolean_t skipaclchk, cred_t *cr)
2336 {
2337 zfs_sb_t *zsb = ZTOZSB(zp);
2338 int err;
2339
2340 *working_mode = v4_mode;
2341 *check_privs = B_TRUE;
2342
2343 /*
2344 * Short circuit empty requests
2345 */
2346 if (v4_mode == 0 || zsb->z_replay) {
2347 *working_mode = 0;
2348 return (0);
2349 }
2350
2351 if ((err = zfs_zaccess_dataset_check(zp, v4_mode)) != 0) {
2352 *check_privs = B_FALSE;
2353 return (err);
2354 }
2355
2356 /*
2357 * The caller requested that the ACL check be skipped. This
2358 * would only happen if the caller checked VOP_ACCESS() with a
2359 * 32 bit ACE mask and already had the appropriate permissions.
2360 */
2361 if (skipaclchk) {
2362 *working_mode = 0;
2363 return (0);
2364 }
2365
2366 return (zfs_zaccess_aces_check(zp, working_mode, B_FALSE, cr));
2367 }
2368
2369 static int
2370 zfs_zaccess_append(znode_t *zp, uint32_t *working_mode, boolean_t *check_privs,
2371 cred_t *cr)
2372 {
2373 if (*working_mode != ACE_WRITE_DATA)
2374 return (EACCES);
2375
2376 return (zfs_zaccess_common(zp, ACE_APPEND_DATA, working_mode,
2377 check_privs, B_FALSE, cr));
2378 }
2379
2380 int
2381 zfs_fastaccesschk_execute(znode_t *zdp, cred_t *cr)
2382 {
2383 boolean_t owner = B_FALSE;
2384 boolean_t groupmbr = B_FALSE;
2385 boolean_t is_attr;
2386 uid_t uid = crgetuid(cr);
2387 int error;
2388
2389 if (zdp->z_pflags & ZFS_AV_QUARANTINED)
2390 return (EACCES);
2391
2392 is_attr = ((zdp->z_pflags & ZFS_XATTR) &&
2393 (S_ISDIR(ZTOI(zdp)->i_mode)));
2394 if (is_attr)
2395 goto slow;
2396
2397
2398 mutex_enter(&zdp->z_acl_lock);
2399
2400 if (zdp->z_pflags & ZFS_NO_EXECS_DENIED) {
2401 mutex_exit(&zdp->z_acl_lock);
2402 return (0);
2403 }
2404
2405 if (FUID_INDEX(zdp->z_uid) != 0 || FUID_INDEX(zdp->z_gid) != 0) {
2406 mutex_exit(&zdp->z_acl_lock);
2407 goto slow;
2408 }
2409
2410 if (uid == zdp->z_uid) {
2411 owner = B_TRUE;
2412 if (zdp->z_mode & S_IXUSR) {
2413 mutex_exit(&zdp->z_acl_lock);
2414 return (0);
2415 } else {
2416 mutex_exit(&zdp->z_acl_lock);
2417 goto slow;
2418 }
2419 }
2420 if (groupmember(zdp->z_gid, cr)) {
2421 groupmbr = B_TRUE;
2422 if (zdp->z_mode & S_IXGRP) {
2423 mutex_exit(&zdp->z_acl_lock);
2424 return (0);
2425 } else {
2426 mutex_exit(&zdp->z_acl_lock);
2427 goto slow;
2428 }
2429 }
2430 if (!owner && !groupmbr) {
2431 if (zdp->z_mode & S_IXOTH) {
2432 mutex_exit(&zdp->z_acl_lock);
2433 return (0);
2434 }
2435 }
2436
2437 mutex_exit(&zdp->z_acl_lock);
2438
2439 slow:
2440 DTRACE_PROBE(zfs__fastpath__execute__access__miss);
2441 ZFS_ENTER(ZTOZSB(zdp));
2442 error = zfs_zaccess(zdp, ACE_EXECUTE, 0, B_FALSE, cr);
2443 ZFS_EXIT(ZTOZSB(zdp));
2444 return (error);
2445 }
2446
2447 /*
2448 * Determine whether Access should be granted/denied.
2449 * The least priv subsytem is always consulted as a basic privilege
2450 * can define any form of access.
2451 */
2452 int
2453 zfs_zaccess(znode_t *zp, int mode, int flags, boolean_t skipaclchk, cred_t *cr)
2454 {
2455 uint32_t working_mode;
2456 int error;
2457 int is_attr;
2458 boolean_t check_privs;
2459 znode_t *xzp;
2460 znode_t *check_zp = zp;
2461 mode_t needed_bits;
2462 uid_t owner;
2463
2464 is_attr = ((zp->z_pflags & ZFS_XATTR) && S_ISDIR(ZTOI(zp)->i_mode));
2465
2466 /*
2467 * If attribute then validate against base file
2468 */
2469 if (is_attr) {
2470 uint64_t parent;
2471
2472 if ((error = sa_lookup(zp->z_sa_hdl,
2473 SA_ZPL_PARENT(ZTOZSB(zp)), &parent,
2474 sizeof (parent))) != 0)
2475 return (error);
2476
2477 if ((error = zfs_zget(ZTOZSB(zp),
2478 parent, &xzp)) != 0) {
2479 return (error);
2480 }
2481
2482 check_zp = xzp;
2483
2484 /*
2485 * fixup mode to map to xattr perms
2486 */
2487
2488 if (mode & (ACE_WRITE_DATA|ACE_APPEND_DATA)) {
2489 mode &= ~(ACE_WRITE_DATA|ACE_APPEND_DATA);
2490 mode |= ACE_WRITE_NAMED_ATTRS;
2491 }
2492
2493 if (mode & (ACE_READ_DATA|ACE_EXECUTE)) {
2494 mode &= ~(ACE_READ_DATA|ACE_EXECUTE);
2495 mode |= ACE_READ_NAMED_ATTRS;
2496 }
2497 }
2498
2499 owner = zfs_fuid_map_id(ZTOZSB(zp), zp->z_uid, cr, ZFS_OWNER);
2500 /*
2501 * Map the bits required to the standard inode flags
2502 * S_IRUSR|S_IWUSR|S_IXUSR in the needed_bits. Map the bits
2503 * mapped by working_mode (currently missing) in missing_bits.
2504 * Call secpolicy_vnode_access2() with (needed_bits & ~checkmode),
2505 * needed_bits.
2506 */
2507 needed_bits = 0;
2508
2509 working_mode = mode;
2510 if ((working_mode & (ACE_READ_ACL|ACE_READ_ATTRIBUTES)) &&
2511 owner == crgetuid(cr))
2512 working_mode &= ~(ACE_READ_ACL|ACE_READ_ATTRIBUTES);
2513
2514 if (working_mode & (ACE_READ_DATA|ACE_READ_NAMED_ATTRS|
2515 ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_SYNCHRONIZE))
2516 needed_bits |= S_IRUSR;
2517 if (working_mode & (ACE_WRITE_DATA|ACE_WRITE_NAMED_ATTRS|
2518 ACE_APPEND_DATA|ACE_WRITE_ATTRIBUTES|ACE_SYNCHRONIZE))
2519 needed_bits |= S_IWUSR;
2520 if (working_mode & ACE_EXECUTE)
2521 needed_bits |= S_IXUSR;
2522
2523 if ((error = zfs_zaccess_common(check_zp, mode, &working_mode,
2524 &check_privs, skipaclchk, cr)) == 0) {
2525 if (is_attr)
2526 iput(ZTOI(xzp));
2527 return (secpolicy_vnode_access2(cr, ZTOI(zp), owner,
2528 needed_bits, needed_bits));
2529 }
2530
2531 if (error && !check_privs) {
2532 if (is_attr)
2533 iput(ZTOI(xzp));
2534 return (error);
2535 }
2536
2537 if (error && (flags & V_APPEND)) {
2538 error = zfs_zaccess_append(zp, &working_mode, &check_privs, cr);
2539 }
2540
2541 if (error && check_privs) {
2542 mode_t checkmode = 0;
2543
2544 /*
2545 * First check for implicit owner permission on
2546 * read_acl/read_attributes
2547 */
2548
2549 error = 0;
2550 ASSERT(working_mode != 0);
2551
2552 if ((working_mode & (ACE_READ_ACL|ACE_READ_ATTRIBUTES) &&
2553 owner == crgetuid(cr)))
2554 working_mode &= ~(ACE_READ_ACL|ACE_READ_ATTRIBUTES);
2555
2556 if (working_mode & (ACE_READ_DATA|ACE_READ_NAMED_ATTRS|
2557 ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_SYNCHRONIZE))
2558 checkmode |= S_IRUSR;
2559 if (working_mode & (ACE_WRITE_DATA|ACE_WRITE_NAMED_ATTRS|
2560 ACE_APPEND_DATA|ACE_WRITE_ATTRIBUTES|ACE_SYNCHRONIZE))
2561 checkmode |= S_IWUSR;
2562 if (working_mode & ACE_EXECUTE)
2563 checkmode |= S_IXUSR;
2564
2565 error = secpolicy_vnode_access2(cr, ZTOI(check_zp), owner,
2566 needed_bits & ~checkmode, needed_bits);
2567
2568 if (error == 0 && (working_mode & ACE_WRITE_OWNER))
2569 error = secpolicy_vnode_chown(cr, owner);
2570 if (error == 0 && (working_mode & ACE_WRITE_ACL))
2571 error = secpolicy_vnode_setdac(cr, owner);
2572
2573 if (error == 0 && (working_mode &
2574 (ACE_DELETE|ACE_DELETE_CHILD)))
2575 error = secpolicy_vnode_remove(cr);
2576
2577 if (error == 0 && (working_mode & ACE_SYNCHRONIZE)) {
2578 error = secpolicy_vnode_chown(cr, owner);
2579 }
2580 if (error == 0) {
2581 /*
2582 * See if any bits other than those already checked
2583 * for are still present. If so then return EACCES
2584 */
2585 if (working_mode & ~(ZFS_CHECKED_MASKS)) {
2586 error = EACCES;
2587 }
2588 }
2589 } else if (error == 0) {
2590 error = secpolicy_vnode_access2(cr, ZTOI(zp), owner,
2591 needed_bits, needed_bits);
2592 }
2593
2594
2595 if (is_attr)
2596 iput(ZTOI(xzp));
2597
2598 return (error);
2599 }
2600
2601 /*
2602 * Translate traditional unix S_IRUSR/S_IWUSR/S_IXUSR mode into
2603 * native ACL format and call zfs_zaccess()
2604 */
2605 int
2606 zfs_zaccess_rwx(znode_t *zp, mode_t mode, int flags, cred_t *cr)
2607 {
2608 return (zfs_zaccess(zp, zfs_unix_to_v4(mode >> 6), flags, B_FALSE, cr));
2609 }
2610
2611 /*
2612 * Access function for secpolicy_vnode_setattr
2613 */
2614 int
2615 zfs_zaccess_unix(znode_t *zp, mode_t mode, cred_t *cr)
2616 {
2617 int v4_mode = zfs_unix_to_v4(mode >> 6);
2618
2619 return (zfs_zaccess(zp, v4_mode, 0, B_FALSE, cr));
2620 }
2621
2622 static int
2623 zfs_delete_final_check(znode_t *zp, znode_t *dzp,
2624 mode_t available_perms, cred_t *cr)
2625 {
2626 int error;
2627 uid_t downer;
2628
2629 downer = zfs_fuid_map_id(ZTOZSB(dzp), dzp->z_uid, cr, ZFS_OWNER);
2630
2631 error = secpolicy_vnode_access2(cr, ZTOI(dzp),
2632 downer, available_perms, S_IWUSR|S_IXUSR);
2633
2634 if (error == 0)
2635 error = zfs_sticky_remove_access(dzp, zp, cr);
2636
2637 return (error);
2638 }
2639
2640 /*
2641 * Determine whether Access should be granted/deny, without
2642 * consulting least priv subsystem.
2643 *
2644 *
2645 * The following chart is the recommended NFSv4 enforcement for
2646 * ability to delete an object.
2647 *
2648 * -------------------------------------------------------
2649 * | Parent Dir | Target Object Permissions |
2650 * | permissions | |
2651 * -------------------------------------------------------
2652 * | | ACL Allows | ACL Denies| Delete |
2653 * | | Delete | Delete | unspecified|
2654 * -------------------------------------------------------
2655 * | ACL Allows | Permit | Permit | Permit |
2656 * | DELETE_CHILD | |
2657 * -------------------------------------------------------
2658 * | ACL Denies | Permit | Deny | Deny |
2659 * | DELETE_CHILD | | | |
2660 * -------------------------------------------------------
2661 * | ACL specifies | | | |
2662 * | only allow | Permit | Permit | Permit |
2663 * | write and | | | |
2664 * | execute | | | |
2665 * -------------------------------------------------------
2666 * | ACL denies | | | |
2667 * | write and | Permit | Deny | Deny |
2668 * | execute | | | |
2669 * -------------------------------------------------------
2670 * ^
2671 * |
2672 * No search privilege, can't even look up file?
2673 *
2674 */
2675 int
2676 zfs_zaccess_delete(znode_t *dzp, znode_t *zp, cred_t *cr)
2677 {
2678 uint32_t dzp_working_mode = 0;
2679 uint32_t zp_working_mode = 0;
2680 int dzp_error, zp_error;
2681 mode_t available_perms;
2682 boolean_t dzpcheck_privs = B_TRUE;
2683 boolean_t zpcheck_privs = B_TRUE;
2684
2685 /*
2686 * We want specific DELETE permissions to
2687 * take precedence over WRITE/EXECUTE. We don't
2688 * want an ACL such as this to mess us up.
2689 * user:joe:write_data:deny,user:joe:delete:allow
2690 *
2691 * However, deny permissions may ultimately be overridden
2692 * by secpolicy_vnode_access().
2693 *
2694 * We will ask for all of the necessary permissions and then
2695 * look at the working modes from the directory and target object
2696 * to determine what was found.
2697 */
2698
2699 if (zp->z_pflags & (ZFS_IMMUTABLE | ZFS_NOUNLINK))
2700 return (EPERM);
2701
2702 /*
2703 * First row
2704 * If the directory permissions allow the delete, we are done.
2705 */
2706 if ((dzp_error = zfs_zaccess_common(dzp, ACE_DELETE_CHILD,
2707 &dzp_working_mode, &dzpcheck_privs, B_FALSE, cr)) == 0)
2708 return (0);
2709
2710 /*
2711 * If target object has delete permission then we are done
2712 */
2713 if ((zp_error = zfs_zaccess_common(zp, ACE_DELETE, &zp_working_mode,
2714 &zpcheck_privs, B_FALSE, cr)) == 0)
2715 return (0);
2716
2717 ASSERT(dzp_error && zp_error);
2718
2719 if (!dzpcheck_privs)
2720 return (dzp_error);
2721 if (!zpcheck_privs)
2722 return (zp_error);
2723
2724 /*
2725 * Second row
2726 *
2727 * If directory returns EACCES then delete_child was denied
2728 * due to deny delete_child. In this case send the request through
2729 * secpolicy_vnode_remove(). We don't use zfs_delete_final_check()
2730 * since that *could* allow the delete based on write/execute permission
2731 * and we want delete permissions to override write/execute.
2732 */
2733
2734 if (dzp_error == EACCES)
2735 return (secpolicy_vnode_remove(cr));
2736
2737 /*
2738 * Third Row
2739 * only need to see if we have write/execute on directory.
2740 */
2741
2742 dzp_error = zfs_zaccess_common(dzp, ACE_EXECUTE|ACE_WRITE_DATA,
2743 &dzp_working_mode, &dzpcheck_privs, B_FALSE, cr);
2744
2745 if (dzp_error != 0 && !dzpcheck_privs)
2746 return (dzp_error);
2747
2748 /*
2749 * Fourth row
2750 */
2751
2752 available_perms = (dzp_working_mode & ACE_WRITE_DATA) ? 0 : S_IWUSR;
2753 available_perms |= (dzp_working_mode & ACE_EXECUTE) ? 0 : S_IXUSR;
2754
2755 return (zfs_delete_final_check(zp, dzp, available_perms, cr));
2756
2757 }
2758
2759 int
2760 zfs_zaccess_rename(znode_t *sdzp, znode_t *szp, znode_t *tdzp,
2761 znode_t *tzp, cred_t *cr)
2762 {
2763 int add_perm;
2764 int error;
2765
2766 if (szp->z_pflags & ZFS_AV_QUARANTINED)
2767 return (EACCES);
2768
2769 add_perm = S_ISDIR(ZTOI(szp)->i_mode) ?
2770 ACE_ADD_SUBDIRECTORY : ACE_ADD_FILE;
2771
2772 /*
2773 * Rename permissions are combination of delete permission +
2774 * add file/subdir permission.
2775 */
2776
2777 /*
2778 * first make sure we do the delete portion.
2779 *
2780 * If that succeeds then check for add_file/add_subdir permissions
2781 */
2782
2783 if ((error = zfs_zaccess_delete(sdzp, szp, cr)))
2784 return (error);
2785
2786 /*
2787 * If we have a tzp, see if we can delete it?
2788 */
2789 if (tzp) {
2790 if ((error = zfs_zaccess_delete(tdzp, tzp, cr)))
2791 return (error);
2792 }
2793
2794 /*
2795 * Now check for add permissions
2796 */
2797 error = zfs_zaccess(tdzp, add_perm, 0, B_FALSE, cr);
2798
2799 return (error);
2800 }
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