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Rename fallthrough to zfs_fallthrough
[mirror_zfs.git] / module / os / freebsd / zfs / zfs_acl.c
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9f0a21e6
MM		 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 * Copyright (c) 2013 by Delphix. All rights reserved.
24 * Copyright 2017 Nexenta Systems, Inc. All rights reserved.
25 */
26
27#include <sys/types.h>
28#include <sys/param.h>
29#include <sys/time.h>
30#include <sys/systm.h>
31#include <sys/sysmacros.h>
32#include <sys/resource.h>
33#include <sys/vfs.h>
34#include <sys/vnode.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/policy.h>
44#include <sys/zfs_znode.h>
45#include <sys/zfs_fuid.h>
46#include <sys/zfs_acl.h>
47#include <sys/zfs_dir.h>
48#include <sys/zfs_quota.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 <acl/acl_common.h>
55
56
57#define ALLOW ACE_ACCESS_ALLOWED_ACE_TYPE
58#define DENY ACE_ACCESS_DENIED_ACE_TYPE
59#define MAX_ACE_TYPE ACE_SYSTEM_ALARM_CALLBACK_OBJECT_ACE_TYPE
60#define MIN_ACE_TYPE ALLOW
61
62#define OWNING_GROUP (ACE_GROUP|ACE_IDENTIFIER_GROUP)
63#define EVERYONE_ALLOW_MASK (ACE_READ_ACL|ACE_READ_ATTRIBUTES | \
64 ACE_READ_NAMED_ATTRS|ACE_SYNCHRONIZE)
65#define EVERYONE_DENY_MASK (ACE_WRITE_ACL|ACE_WRITE_OWNER | \
66 ACE_WRITE_ATTRIBUTES|ACE_WRITE_NAMED_ATTRS)
67#define OWNER_ALLOW_MASK (ACE_WRITE_ACL | ACE_WRITE_OWNER | \
68 ACE_WRITE_ATTRIBUTES|ACE_WRITE_NAMED_ATTRS)
69
70#define ZFS_CHECKED_MASKS (ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_READ_DATA| \
71 ACE_READ_NAMED_ATTRS|ACE_WRITE_DATA|ACE_WRITE_ATTRIBUTES| \
72 ACE_WRITE_NAMED_ATTRS|ACE_APPEND_DATA|ACE_EXECUTE|ACE_WRITE_OWNER| \
73 ACE_WRITE_ACL|ACE_DELETE|ACE_DELETE_CHILD|ACE_SYNCHRONIZE)
74
75#define WRITE_MASK_DATA (ACE_WRITE_DATA|ACE_APPEND_DATA|ACE_WRITE_NAMED_ATTRS)
76#define WRITE_MASK_ATTRS (ACE_WRITE_ACL|ACE_WRITE_OWNER|ACE_WRITE_ATTRIBUTES| \
77 ACE_DELETE|ACE_DELETE_CHILD)
78#define WRITE_MASK (WRITE_MASK_DATA|WRITE_MASK_ATTRS)
79
80#define OGE_CLEAR (ACE_READ_DATA|ACE_LIST_DIRECTORY|ACE_WRITE_DATA| \
81 ACE_ADD_FILE|ACE_APPEND_DATA|ACE_ADD_SUBDIRECTORY|ACE_EXECUTE)
82
83#define OKAY_MASK_BITS (ACE_READ_DATA|ACE_LIST_DIRECTORY|ACE_WRITE_DATA| \
84 ACE_ADD_FILE|ACE_APPEND_DATA|ACE_ADD_SUBDIRECTORY|ACE_EXECUTE)
85
86#define ALL_INHERIT (ACE_FILE_INHERIT_ACE|ACE_DIRECTORY_INHERIT_ACE | \
87 ACE_NO_PROPAGATE_INHERIT_ACE|ACE_INHERIT_ONLY_ACE|ACE_INHERITED_ACE)
88
89#define RESTRICTED_CLEAR (ACE_WRITE_ACL|ACE_WRITE_OWNER)
90
91#define V4_ACL_WIDE_FLAGS (ZFS_ACL_AUTO_INHERIT|ZFS_ACL_DEFAULTED|\
92 ZFS_ACL_PROTECTED)
93
94#define ZFS_ACL_WIDE_FLAGS (V4_ACL_WIDE_FLAGS|ZFS_ACL_TRIVIAL|ZFS_INHERIT_ACE|\
95 ZFS_ACL_OBJ_ACE)
96
97#define ALL_MODE_EXECS (S_IXUSR | S_IXGRP | S_IXOTH)
98
99static uint16_t
100zfs_ace_v0_get_type(void *acep)
101{
102 return (((zfs_oldace_t *)acep)->z_type);
103}
104
105static uint16_t
106zfs_ace_v0_get_flags(void *acep)
107{
108 return (((zfs_oldace_t *)acep)->z_flags);
109}
110
111static uint32_t
112zfs_ace_v0_get_mask(void *acep)
113{
114 return (((zfs_oldace_t *)acep)->z_access_mask);
115}
116
117static uint64_t
118zfs_ace_v0_get_who(void *acep)
119{
120 return (((zfs_oldace_t *)acep)->z_fuid);
121}
122
123static void
124zfs_ace_v0_set_type(void *acep, uint16_t type)
125{
126 ((zfs_oldace_t *)acep)->z_type = type;
127}
128
129static void
130zfs_ace_v0_set_flags(void *acep, uint16_t flags)
131{
132 ((zfs_oldace_t *)acep)->z_flags = flags;
133}
134
135static void
136zfs_ace_v0_set_mask(void *acep, uint32_t mask)
137{
138 ((zfs_oldace_t *)acep)->z_access_mask = mask;
139}
140
141static void
142zfs_ace_v0_set_who(void *acep, uint64_t who)
143{
144 ((zfs_oldace_t *)acep)->z_fuid = who;
145}
146
147/*ARGSUSED*/
148static size_t
149zfs_ace_v0_size(void *acep)
150{
151 return (sizeof (zfs_oldace_t));
152}
153
154static size_t
155zfs_ace_v0_abstract_size(void)
156{
157 return (sizeof (zfs_oldace_t));
158}
159
160static int
161zfs_ace_v0_mask_off(void)
162{
163 return (offsetof(zfs_oldace_t, z_access_mask));
164}
165
166/*ARGSUSED*/
167static int
168zfs_ace_v0_data(void *acep, void **datap)
169{
170 *datap = NULL;
171 return (0);
172}
173
18168da7 174static const acl_ops_t zfs_acl_v0_ops = {
9f0a21e6
MM		 175 zfs_ace_v0_get_mask,
176 zfs_ace_v0_set_mask,
177 zfs_ace_v0_get_flags,
178 zfs_ace_v0_set_flags,
179 zfs_ace_v0_get_type,
180 zfs_ace_v0_set_type,
181 zfs_ace_v0_get_who,
182 zfs_ace_v0_set_who,
183 zfs_ace_v0_size,
184 zfs_ace_v0_abstract_size,
185 zfs_ace_v0_mask_off,
186 zfs_ace_v0_data
187};
188
189static uint16_t
190zfs_ace_fuid_get_type(void *acep)
191{
192 return (((zfs_ace_hdr_t *)acep)->z_type);
193}
194
195static uint16_t
196zfs_ace_fuid_get_flags(void *acep)
197{
198 return (((zfs_ace_hdr_t *)acep)->z_flags);
199}
200
201static uint32_t
202zfs_ace_fuid_get_mask(void *acep)
203{
204 return (((zfs_ace_hdr_t *)acep)->z_access_mask);
205}
206
207static uint64_t
208zfs_ace_fuid_get_who(void *args)
209{
210 uint16_t entry_type;
211 zfs_ace_t *acep = args;
212
213 entry_type = acep->z_hdr.z_flags & ACE_TYPE_FLAGS;
214
215 if (entry_type == ACE_OWNER || entry_type == OWNING_GROUP ||
216 entry_type == ACE_EVERYONE)
217 return (-1);
218 return (((zfs_ace_t *)acep)->z_fuid);
219}
220
221static void
222zfs_ace_fuid_set_type(void *acep, uint16_t type)
223{
224 ((zfs_ace_hdr_t *)acep)->z_type = type;
225}
226
227static void
228zfs_ace_fuid_set_flags(void *acep, uint16_t flags)
229{
230 ((zfs_ace_hdr_t *)acep)->z_flags = flags;
231}
232
233static void
234zfs_ace_fuid_set_mask(void *acep, uint32_t mask)
235{
236 ((zfs_ace_hdr_t *)acep)->z_access_mask = mask;
237}
238
239static void
240zfs_ace_fuid_set_who(void *arg, uint64_t who)
241{
242 zfs_ace_t *acep = arg;
243
244 uint16_t entry_type = acep->z_hdr.z_flags & ACE_TYPE_FLAGS;
245
246 if (entry_type == ACE_OWNER || entry_type == OWNING_GROUP ||
247 entry_type == ACE_EVERYONE)
248 return;
249 acep->z_fuid = who;
250}
251
252static size_t
253zfs_ace_fuid_size(void *acep)
254{
255 zfs_ace_hdr_t *zacep = acep;
256 uint16_t entry_type;
257
258 switch (zacep->z_type) {
259 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
260 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
261 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
262 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
263 return (sizeof (zfs_object_ace_t));
264 case ALLOW:
265 case DENY:
266 entry_type =
267 (((zfs_ace_hdr_t *)acep)->z_flags & ACE_TYPE_FLAGS);
268 if (entry_type == ACE_OWNER ||
269 entry_type == OWNING_GROUP ||
270 entry_type == ACE_EVERYONE)
271 return (sizeof (zfs_ace_hdr_t));
9a70e97f 272 zfs_fallthrough;
9f0a21e6
MM		 273 default:
274 return (sizeof (zfs_ace_t));
275 }
276}
277
278static size_t
279zfs_ace_fuid_abstract_size(void)
280{
281 return (sizeof (zfs_ace_hdr_t));
282}
283
284static int
285zfs_ace_fuid_mask_off(void)
286{
287 return (offsetof(zfs_ace_hdr_t, z_access_mask));
288}
289
290static int
291zfs_ace_fuid_data(void *acep, void **datap)
292{
293 zfs_ace_t *zacep = acep;
294 zfs_object_ace_t *zobjp;
295
296 switch (zacep->z_hdr.z_type) {
297 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
298 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
299 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
300 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
301 zobjp = acep;
302 *datap = (caddr_t)zobjp + sizeof (zfs_ace_t);
303 return (sizeof (zfs_object_ace_t) - sizeof (zfs_ace_t));
304 default:
305 *datap = NULL;
306 return (0);
307 }
308}
309
18168da7 310static const acl_ops_t zfs_acl_fuid_ops = {
9f0a21e6
MM		 311 zfs_ace_fuid_get_mask,
312 zfs_ace_fuid_set_mask,
313 zfs_ace_fuid_get_flags,
314 zfs_ace_fuid_set_flags,
315 zfs_ace_fuid_get_type,
316 zfs_ace_fuid_set_type,
317 zfs_ace_fuid_get_who,
318 zfs_ace_fuid_set_who,
319 zfs_ace_fuid_size,
320 zfs_ace_fuid_abstract_size,
321 zfs_ace_fuid_mask_off,
322 zfs_ace_fuid_data
323};
324
325/*
326 * The following three functions are provided for compatibility with
327 * older ZPL version in order to determine if the file use to have
328 * an external ACL and what version of ACL previously existed on the
329 * file. Would really be nice to not need this, sigh.
330 */
331uint64_t
332zfs_external_acl(znode_t *zp)
333{
334 zfs_acl_phys_t acl_phys;
335 int error;
336
337 if (zp->z_is_sa)
338 return (0);
339
340 /*
341 * Need to deal with a potential
342 * race where zfs_sa_upgrade could cause
343 * z_isa_sa to change.
344 *
345 * If the lookup fails then the state of z_is_sa should have
346 * changed.
347 */
348
349 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_ZNODE_ACL(zp->z_zfsvfs),
350 &acl_phys, sizeof (acl_phys))) == 0)
351 return (acl_phys.z_acl_extern_obj);
352 else {
353 /*
354 * after upgrade the SA_ZPL_ZNODE_ACL should have been
355 * removed
356 */
e4efb709
RM		 357 VERIFY(zp->z_is_sa);
358 VERIFY3S(error, ==, ENOENT);
9f0a21e6
MM		 359 return (0);
360 }
361}
362
363/*
364 * Determine size of ACL in bytes
365 *
366 * This is more complicated than it should be since we have to deal
367 * with old external ACLs.
368 */
369static int
370zfs_acl_znode_info(znode_t *zp, int *aclsize, int *aclcount,
371 zfs_acl_phys_t *aclphys)
372{
373 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
374 uint64_t acl_count;
375 int size;
376 int error;
377
378 ASSERT(MUTEX_HELD(&zp->z_acl_lock));
379 if (zp->z_is_sa) {
380 if ((error = sa_size(zp->z_sa_hdl, SA_ZPL_DACL_ACES(zfsvfs),
381 &size)) != 0)
382 return (error);
383 *aclsize = size;
384 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_DACL_COUNT(zfsvfs),
385 &acl_count, sizeof (acl_count))) != 0)
386 return (error);
387 *aclcount = acl_count;
388 } else {
389 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_ZNODE_ACL(zfsvfs),
390 aclphys, sizeof (*aclphys))) != 0)
391 return (error);
392
393 if (aclphys->z_acl_version == ZFS_ACL_VERSION_INITIAL) {
394 *aclsize = ZFS_ACL_SIZE(aclphys->z_acl_size);
395 *aclcount = aclphys->z_acl_size;
396 } else {
397 *aclsize = aclphys->z_acl_size;
398 *aclcount = aclphys->z_acl_count;
399 }
400 }
401 return (0);
402}
403
404int
405zfs_znode_acl_version(znode_t *zp)
406{
407 zfs_acl_phys_t acl_phys;
408
409 if (zp->z_is_sa)
410 return (ZFS_ACL_VERSION_FUID);
411 else {
412 int error;
413
414 /*
415 * Need to deal with a potential
416 * race where zfs_sa_upgrade could cause
417 * z_isa_sa to change.
418 *
419 * If the lookup fails then the state of z_is_sa should have
420 * changed.
421 */
422 if ((error = sa_lookup(zp->z_sa_hdl,
423 SA_ZPL_ZNODE_ACL(zp->z_zfsvfs),
424 &acl_phys, sizeof (acl_phys))) == 0)
425 return (acl_phys.z_acl_version);
426 else {
427 /*
428 * After upgrade SA_ZPL_ZNODE_ACL should have
429 * been removed.
430 */
e4efb709
RM		 431 VERIFY(zp->z_is_sa);
432 VERIFY3S(error, ==, ENOENT);
9f0a21e6
MM		 433 return (ZFS_ACL_VERSION_FUID);
434 }
435 }
436}
437
438static int
439zfs_acl_version(int version)
440{
441 if (version < ZPL_VERSION_FUID)
442 return (ZFS_ACL_VERSION_INITIAL);
443 else
444 return (ZFS_ACL_VERSION_FUID);
445}
446
447static int
448zfs_acl_version_zp(znode_t *zp)
449{
450 return (zfs_acl_version(zp->z_zfsvfs->z_version));
451}
452
453zfs_acl_t *
454zfs_acl_alloc(int vers)
455{
456 zfs_acl_t *aclp;
457
458 aclp = kmem_zalloc(sizeof (zfs_acl_t), KM_SLEEP);
459 list_create(&aclp->z_acl, sizeof (zfs_acl_node_t),
460 offsetof(zfs_acl_node_t, z_next));
461 aclp->z_version = vers;
462 if (vers == ZFS_ACL_VERSION_FUID)
463 aclp->z_ops = &zfs_acl_fuid_ops;
464 else
465 aclp->z_ops = &zfs_acl_v0_ops;
466 return (aclp);
467}
468
469zfs_acl_node_t *
470zfs_acl_node_alloc(size_t bytes)
471{
472 zfs_acl_node_t *aclnode;
473
474 aclnode = kmem_zalloc(sizeof (zfs_acl_node_t), KM_SLEEP);
475 if (bytes) {
476 aclnode->z_acldata = kmem_alloc(bytes, KM_SLEEP);
477 aclnode->z_allocdata = aclnode->z_acldata;
478 aclnode->z_allocsize = bytes;
479 aclnode->z_size = bytes;
480 }
481
482 return (aclnode);
483}
484
485static void
486zfs_acl_node_free(zfs_acl_node_t *aclnode)
487{
488 if (aclnode->z_allocsize)
489 kmem_free(aclnode->z_allocdata, aclnode->z_allocsize);
490 kmem_free(aclnode, sizeof (zfs_acl_node_t));
491}
492
493static void
494zfs_acl_release_nodes(zfs_acl_t *aclp)
495{
496 zfs_acl_node_t *aclnode;
497
498 while ((aclnode = list_head(&aclp->z_acl))) {
499 list_remove(&aclp->z_acl, aclnode);
500 zfs_acl_node_free(aclnode);
501 }
502 aclp->z_acl_count = 0;
503 aclp->z_acl_bytes = 0;
504}
505
506void
507zfs_acl_free(zfs_acl_t *aclp)
508{
509 zfs_acl_release_nodes(aclp);
510 list_destroy(&aclp->z_acl);
511 kmem_free(aclp, sizeof (zfs_acl_t));
512}
513
514static boolean_t
515zfs_acl_valid_ace_type(uint_t type, uint_t flags)
516{
517 uint16_t entry_type;
518
519 switch (type) {
520 case ALLOW:
521 case DENY:
522 case ACE_SYSTEM_AUDIT_ACE_TYPE:
523 case ACE_SYSTEM_ALARM_ACE_TYPE:
524 entry_type = flags & ACE_TYPE_FLAGS;
525 return (entry_type == ACE_OWNER ||
526 entry_type == OWNING_GROUP ||
527 entry_type == ACE_EVERYONE || entry_type == 0 ||
528 entry_type == ACE_IDENTIFIER_GROUP);
529 default:
530 if (type >= MIN_ACE_TYPE && type <= MAX_ACE_TYPE)
531 return (B_TRUE);
532 }
533 return (B_FALSE);
534}
535
536static boolean_t
537zfs_ace_valid(vtype_t obj_type, zfs_acl_t *aclp, uint16_t type, uint16_t iflags)
538{
539 /*
540 * first check type of entry
541 */
542
543 if (!zfs_acl_valid_ace_type(type, iflags))
544 return (B_FALSE);
545
546 switch (type) {
547 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
548 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
549 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
550 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
551 if (aclp->z_version < ZFS_ACL_VERSION_FUID)
552 return (B_FALSE);
553 aclp->z_hints |= ZFS_ACL_OBJ_ACE;
554 }
555
556 /*
557 * next check inheritance level flags
558 */
559
560 if (obj_type == VDIR &&
561 (iflags & (ACE_FILE_INHERIT_ACE|ACE_DIRECTORY_INHERIT_ACE)))
562 aclp->z_hints |= ZFS_INHERIT_ACE;
563
564 if (iflags & (ACE_INHERIT_ONLY_ACE|ACE_NO_PROPAGATE_INHERIT_ACE)) {
565 if ((iflags & (ACE_FILE_INHERIT_ACE|
566 ACE_DIRECTORY_INHERIT_ACE)) == 0) {
567 return (B_FALSE);
568 }
569 }
570
571 return (B_TRUE);
572}
573
574static void *
575zfs_acl_next_ace(zfs_acl_t *aclp, void *start, uint64_t *who,
576 uint32_t *access_mask, uint16_t *iflags, uint16_t *type)
577{
578 zfs_acl_node_t *aclnode;
579
e4efb709 580 ASSERT3P(aclp, !=, NULL);
9f0a21e6
MM		 581
582 if (start == NULL) {
583 aclnode = list_head(&aclp->z_acl);
584 if (aclnode == NULL)
585 return (NULL);
586
587 aclp->z_next_ace = aclnode->z_acldata;
588 aclp->z_curr_node = aclnode;
589 aclnode->z_ace_idx = 0;
590 }
591
592 aclnode = aclp->z_curr_node;
593
594 if (aclnode == NULL)
595 return (NULL);
596
597 if (aclnode->z_ace_idx >= aclnode->z_ace_count) {
598 aclnode = list_next(&aclp->z_acl, aclnode);
599 if (aclnode == NULL)
600 return (NULL);
601 else {
602 aclp->z_curr_node = aclnode;
603 aclnode->z_ace_idx = 0;
604 aclp->z_next_ace = aclnode->z_acldata;
605 }
606 }
607
608 if (aclnode->z_ace_idx < aclnode->z_ace_count) {
609 void *acep = aclp->z_next_ace;
610 size_t ace_size;
611
612 /*
613 * Make sure we don't overstep our bounds
614 */
615 ace_size = aclp->z_ops->ace_size(acep);
616
617 if (((caddr_t)acep + ace_size) >
618 ((caddr_t)aclnode->z_acldata + aclnode->z_size)) {
619 return (NULL);
620 }
621
622 *iflags = aclp->z_ops->ace_flags_get(acep);
623 *type = aclp->z_ops->ace_type_get(acep);
624 *access_mask = aclp->z_ops->ace_mask_get(acep);
625 *who = aclp->z_ops->ace_who_get(acep);
626 aclp->z_next_ace = (caddr_t)aclp->z_next_ace + ace_size;
627 aclnode->z_ace_idx++;
628
629 return ((void *)acep);
630 }
631 return (NULL);
632}
633
634/*ARGSUSED*/
635static uint64_t
636zfs_ace_walk(void *datap, uint64_t cookie, int aclcnt,
637 uint16_t *flags, uint16_t *type, uint32_t *mask)
638{
639 zfs_acl_t *aclp = datap;
640 zfs_ace_hdr_t *acep = (zfs_ace_hdr_t *)(uintptr_t)cookie;
641 uint64_t who;
642
643 acep = zfs_acl_next_ace(aclp, acep, &who, mask,
644 flags, type);
645 return ((uint64_t)(uintptr_t)acep);
646}
647
648/*
649 * Copy ACE to internal ZFS format.
650 * While processing the ACL each ACE will be validated for correctness.
651 * ACE FUIDs will be created later.
652 */
65c7cc49 653static int
9f0a21e6
MM		 654zfs_copy_ace_2_fuid(zfsvfs_t *zfsvfs, vtype_t obj_type, zfs_acl_t *aclp,
655 void *datap, zfs_ace_t *z_acl, uint64_t aclcnt, size_t *size,
656 zfs_fuid_info_t **fuidp, cred_t *cr)
657{
658 int i;
659 uint16_t entry_type;
660 zfs_ace_t *aceptr = z_acl;
661 ace_t *acep = datap;
662 zfs_object_ace_t *zobjacep;
663 ace_object_t *aceobjp;
664
665 for (i = 0; i != aclcnt; i++) {
666 aceptr->z_hdr.z_access_mask = acep->a_access_mask;
667 aceptr->z_hdr.z_flags = acep->a_flags;
668 aceptr->z_hdr.z_type = acep->a_type;
669 entry_type = aceptr->z_hdr.z_flags & ACE_TYPE_FLAGS;
670 if (entry_type != ACE_OWNER && entry_type != OWNING_GROUP &&
671 entry_type != ACE_EVERYONE) {
672 aceptr->z_fuid = zfs_fuid_create(zfsvfs, acep->a_who,
673 cr, (entry_type == 0) ?
674 ZFS_ACE_USER : ZFS_ACE_GROUP, fuidp);
675 }
676
677 /*
678 * Make sure ACE is valid
679 */
680 if (zfs_ace_valid(obj_type, aclp, aceptr->z_hdr.z_type,
681 aceptr->z_hdr.z_flags) != B_TRUE)
682 return (SET_ERROR(EINVAL));
683
684 switch (acep->a_type) {
685 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
686 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
687 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
688 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
689 zobjacep = (zfs_object_ace_t *)aceptr;
690 aceobjp = (ace_object_t *)acep;
691
692 bcopy(aceobjp->a_obj_type, zobjacep->z_object_type,
693 sizeof (aceobjp->a_obj_type));
694 bcopy(aceobjp->a_inherit_obj_type,
695 zobjacep->z_inherit_type,
696 sizeof (aceobjp->a_inherit_obj_type));
697 acep = (ace_t *)((caddr_t)acep + sizeof (ace_object_t));
698 break;
699 default:
700 acep = (ace_t *)((caddr_t)acep + sizeof (ace_t));
701 }
702
703 aceptr = (zfs_ace_t *)((caddr_t)aceptr +
704 aclp->z_ops->ace_size(aceptr));
705 }
706
707 *size = (caddr_t)aceptr - (caddr_t)z_acl;
708
709 return (0);
710}
711
712/*
713 * Copy ZFS ACEs to fixed size ace_t layout
714 */
715static void
716zfs_copy_fuid_2_ace(zfsvfs_t *zfsvfs, zfs_acl_t *aclp, cred_t *cr,
717 void *datap, int filter)
718{
719 uint64_t who;
720 uint32_t access_mask;
721 uint16_t iflags, type;
722 zfs_ace_hdr_t *zacep = NULL;
723 ace_t *acep = datap;
724 ace_object_t *objacep;
725 zfs_object_ace_t *zobjacep;
726 size_t ace_size;
727 uint16_t entry_type;
728
729 while ((zacep = zfs_acl_next_ace(aclp, zacep,
730 &who, &access_mask, &iflags, &type))) {
731
732 switch (type) {
733 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
734 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
735 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
736 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
737 if (filter) {
738 continue;
739 }
740 zobjacep = (zfs_object_ace_t *)zacep;
741 objacep = (ace_object_t *)acep;
742 bcopy(zobjacep->z_object_type,
743 objacep->a_obj_type,
744 sizeof (zobjacep->z_object_type));
745 bcopy(zobjacep->z_inherit_type,
746 objacep->a_inherit_obj_type,
747 sizeof (zobjacep->z_inherit_type));
748 ace_size = sizeof (ace_object_t);
749 break;
750 default:
751 ace_size = sizeof (ace_t);
752 break;
753 }
754
755 entry_type = (iflags & ACE_TYPE_FLAGS);
756 if ((entry_type != ACE_OWNER &&
757 entry_type != OWNING_GROUP &&
758 entry_type != ACE_EVERYONE)) {
759 acep->a_who = zfs_fuid_map_id(zfsvfs, who,
760 cr, (entry_type & ACE_IDENTIFIER_GROUP) ?
761 ZFS_ACE_GROUP : ZFS_ACE_USER);
762 } else {
763 acep->a_who = (uid_t)(int64_t)who;
764 }
765 acep->a_access_mask = access_mask;
766 acep->a_flags = iflags;
767 acep->a_type = type;
768 acep = (ace_t *)((caddr_t)acep + ace_size);
769 }
770}
771
772static int
773zfs_copy_ace_2_oldace(vtype_t obj_type, zfs_acl_t *aclp, ace_t *acep,
774 zfs_oldace_t *z_acl, int aclcnt, size_t *size)
775{
776 int i;
777 zfs_oldace_t *aceptr = z_acl;
778
779 for (i = 0; i != aclcnt; i++, aceptr++) {
780 aceptr->z_access_mask = acep[i].a_access_mask;
781 aceptr->z_type = acep[i].a_type;
782 aceptr->z_flags = acep[i].a_flags;
783 aceptr->z_fuid = acep[i].a_who;
784 /*
785 * Make sure ACE is valid
786 */
787 if (zfs_ace_valid(obj_type, aclp, aceptr->z_type,
788 aceptr->z_flags) != B_TRUE)
789 return (SET_ERROR(EINVAL));
790 }
791 *size = (caddr_t)aceptr - (caddr_t)z_acl;
792 return (0);
793}
794
795/*
796 * convert old ACL format to new
797 */
798void
799zfs_acl_xform(znode_t *zp, zfs_acl_t *aclp, cred_t *cr)
800{
801 zfs_oldace_t *oldaclp;
802 int i;
803 uint16_t type, iflags;
804 uint32_t access_mask;
805 uint64_t who;
806 void *cookie = NULL;
807 zfs_acl_node_t *newaclnode;
808
e4efb709 809 ASSERT3U(aclp->z_version, ==, ZFS_ACL_VERSION_INITIAL);
9f0a21e6
MM		 810 /*
811 * First create the ACE in a contiguous piece of memory
812 * for zfs_copy_ace_2_fuid().
813 *
814 * We only convert an ACL once, so this won't happen
815 * everytime.
816 */
817 oldaclp = kmem_alloc(sizeof (zfs_oldace_t) * aclp->z_acl_count,
818 KM_SLEEP);
819 i = 0;
820 while ((cookie = zfs_acl_next_ace(aclp, cookie, &who,
821 &access_mask, &iflags, &type))) {
822 oldaclp[i].z_flags = iflags;
823 oldaclp[i].z_type = type;
824 oldaclp[i].z_fuid = who;
825 oldaclp[i++].z_access_mask = access_mask;
826 }
827
828 newaclnode = zfs_acl_node_alloc(aclp->z_acl_count *
829 sizeof (zfs_object_ace_t));
830 aclp->z_ops = &zfs_acl_fuid_ops;
e4efb709 831 VERIFY0(zfs_copy_ace_2_fuid(zp->z_zfsvfs, ZTOV(zp)->v_type, aclp,
9f0a21e6 832 oldaclp, newaclnode->z_acldata, aclp->z_acl_count,
e4efb709 833 &newaclnode->z_size, NULL, cr));
9f0a21e6
MM		 834 newaclnode->z_ace_count = aclp->z_acl_count;
835 aclp->z_version = ZFS_ACL_VERSION;
836 kmem_free(oldaclp, aclp->z_acl_count * sizeof (zfs_oldace_t));
837
838 /*
839 * Release all previous ACL nodes
840 */
841
842 zfs_acl_release_nodes(aclp);
843
844 list_insert_head(&aclp->z_acl, newaclnode);
845
846 aclp->z_acl_bytes = newaclnode->z_size;
847 aclp->z_acl_count = newaclnode->z_ace_count;
848
849}
850
851/*
852 * Convert unix access mask to v4 access mask
853 */
854static uint32_t
855zfs_unix_to_v4(uint32_t access_mask)
856{
857 uint32_t new_mask = 0;
858
859 if (access_mask & S_IXOTH)
860 new_mask |= ACE_EXECUTE;
861 if (access_mask & S_IWOTH)
862 new_mask |= ACE_WRITE_DATA;
863 if (access_mask & S_IROTH)
864 new_mask |= ACE_READ_DATA;
865 return (new_mask);
866}
867
868static void
869zfs_set_ace(zfs_acl_t *aclp, void *acep, uint32_t access_mask,
870 uint16_t access_type, uint64_t fuid, uint16_t entry_type)
871{
872 uint16_t type = entry_type & ACE_TYPE_FLAGS;
873
874 aclp->z_ops->ace_mask_set(acep, access_mask);
875 aclp->z_ops->ace_type_set(acep, access_type);
876 aclp->z_ops->ace_flags_set(acep, entry_type);
877 if ((type != ACE_OWNER && type != OWNING_GROUP &&
878 type != ACE_EVERYONE))
879 aclp->z_ops->ace_who_set(acep, fuid);
880}
881
882/*
883 * Determine mode of file based on ACL.
884 */
885uint64_t
886zfs_mode_compute(uint64_t fmode, zfs_acl_t *aclp,
887 uint64_t *pflags, uint64_t fuid, uint64_t fgid)
888{
889 int entry_type;
890 mode_t mode;
891 mode_t seen = 0;
892 zfs_ace_hdr_t *acep = NULL;
893 uint64_t who;
894 uint16_t iflags, type;
895 uint32_t access_mask;
896 boolean_t an_exec_denied = B_FALSE;
897
898 mode = (fmode & (S_IFMT | S_ISUID | S_ISGID | S_ISVTX));
899
900 while ((acep = zfs_acl_next_ace(aclp, acep, &who,
901 &access_mask, &iflags, &type))) {
902
903 if (!zfs_acl_valid_ace_type(type, iflags))
904 continue;
905
906 entry_type = (iflags & ACE_TYPE_FLAGS);
907
908 /*
909 * Skip over any inherit_only ACEs
910 */
911 if (iflags & ACE_INHERIT_ONLY_ACE)
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 */
1054int
1055zfs_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
1066 ASSERT(MUTEX_HELD(&zp->z_acl_lock));
1067 if (zp->z_zfsvfs->z_replay == B_FALSE)
1068 ASSERT_VOP_LOCKED(ZTOV(zp), __func__);
1069
1070 if (zp->z_acl_cached && !will_modify) {
1071 *aclpp = zp->z_acl_cached;
1072 return (0);
1073 }
1074
1075 version = zfs_znode_acl_version(zp);
1076
1077 if ((error = zfs_acl_znode_info(zp, &aclsize,
1078 &acl_count, &znode_acl)) != 0) {
1079 goto done;
1080 }
1081
1082 aclp = zfs_acl_alloc(version);
1083
1084 aclp->z_acl_count = acl_count;
1085 aclp->z_acl_bytes = aclsize;
1086
1087 aclnode = zfs_acl_node_alloc(aclsize);
1088 aclnode->z_ace_count = aclp->z_acl_count;
1089 aclnode->z_size = aclsize;
1090
1091 if (!zp->z_is_sa) {
1092 if (znode_acl.z_acl_extern_obj) {
1093 error = dmu_read(zp->z_zfsvfs->z_os,
1094 znode_acl.z_acl_extern_obj, 0, aclnode->z_size,
1095 aclnode->z_acldata, DMU_READ_PREFETCH);
1096 } else {
1097 bcopy(znode_acl.z_ace_data, aclnode->z_acldata,
1098 aclnode->z_size);
1099 }
1100 } else {
1101 error = sa_lookup(zp->z_sa_hdl, SA_ZPL_DACL_ACES(zp->z_zfsvfs),
1102 aclnode->z_acldata, aclnode->z_size);
1103 }
1104
1105 if (error != 0) {
1106 zfs_acl_free(aclp);
1107 zfs_acl_node_free(aclnode);
1108 /* convert checksum errors into IO errors */
1109 if (error == ECKSUM)
1110 error = SET_ERROR(EIO);
1111 goto done;
1112 }
1113
1114 list_insert_head(&aclp->z_acl, aclnode);
1115
1116 *aclpp = aclp;
1117 if (!will_modify)
1118 zp->z_acl_cached = aclp;
1119done:
1120 return (error);
1121}
1122
1123/*ARGSUSED*/
1124void
1125zfs_acl_data_locator(void **dataptr, uint32_t *length, uint32_t buflen,
1126 boolean_t start, void *userdata)
1127{
1128 zfs_acl_locator_cb_t *cb = (zfs_acl_locator_cb_t *)userdata;
1129
1130 if (start) {
1131 cb->cb_acl_node = list_head(&cb->cb_aclp->z_acl);
1132 } else {
1133 cb->cb_acl_node = list_next(&cb->cb_aclp->z_acl,
1134 cb->cb_acl_node);
1135 }
1136 *dataptr = cb->cb_acl_node->z_acldata;
1137 *length = cb->cb_acl_node->z_size;
1138}
1139
1140int
1141zfs_acl_chown_setattr(znode_t *zp)
1142{
1143 int error;
1144 zfs_acl_t *aclp;
1145
2f385c91 1146 if (zp->z_zfsvfs->z_replay == B_FALSE) {
9f0a21e6 1147 ASSERT_VOP_ELOCKED(ZTOV(zp), __func__);
2f385c91
MG		 1148 ASSERT_VOP_IN_SEQC(ZTOV(zp));
1149 }
9f0a21e6
MM		 1150 ASSERT(MUTEX_HELD(&zp->z_acl_lock));
1151
1152 if ((error = zfs_acl_node_read(zp, B_TRUE, &aclp, B_FALSE)) == 0)
1153 zp->z_mode = zfs_mode_compute(zp->z_mode, aclp,
1154 &zp->z_pflags, zp->z_uid, zp->z_gid);
1155 return (error);
1156}
1157
1158/*
1159 * common code for setting ACLs.
1160 *
1161 * This function is called from zfs_mode_update, zfs_perm_init, and zfs_setacl.
1162 * zfs_setacl passes a non-NULL inherit pointer (ihp) to indicate that it's
1163 * already checked the acl and knows whether to inherit.
1164 */
1165int
1166zfs_aclset_common(znode_t *zp, zfs_acl_t *aclp, cred_t *cr, dmu_tx_t *tx)
1167{
1168 int error;
1169 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1170 dmu_object_type_t otype;
1171 zfs_acl_locator_cb_t locate = { 0 };
1172 uint64_t mode;
1173 sa_bulk_attr_t bulk[5];
1174 uint64_t ctime[2];
1175 int count = 0;
1176 zfs_acl_phys_t acl_phys;
1177
2f385c91
MG		 1178 if (zp->z_zfsvfs->z_replay == B_FALSE) {
1179 ASSERT_VOP_IN_SEQC(ZTOV(zp));
1180 }
1b376d17 1181
9f0a21e6
MM		 1182 mode = zp->z_mode;
1183
1184 mode = zfs_mode_compute(mode, aclp, &zp->z_pflags,
1185 zp->z_uid, zp->z_gid);
1186
1187 zp->z_mode = mode;
1188 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL,
1189 &mode, sizeof (mode));
1190 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
1191 &zp->z_pflags, sizeof (zp->z_pflags));
1192 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
1193 &ctime, sizeof (ctime));
1194
1195 if (zp->z_acl_cached) {
1196 zfs_acl_free(zp->z_acl_cached);
1197 zp->z_acl_cached = NULL;
1198 }
1199
1200 /*
1201 * Upgrade needed?
1202 */
1203 if (!zfsvfs->z_use_fuids) {
1204 otype = DMU_OT_OLDACL;
1205 } else {
1206 if ((aclp->z_version == ZFS_ACL_VERSION_INITIAL) &&
1207 (zfsvfs->z_version >= ZPL_VERSION_FUID))
1208 zfs_acl_xform(zp, aclp, cr);
e4efb709 1209 ASSERT3U(aclp->z_version, >=, ZFS_ACL_VERSION_FUID);
9f0a21e6
MM		 1210 otype = DMU_OT_ACL;
1211 }
1212
1213 /*
1214 * Arrgh, we have to handle old on disk format
1215 * as well as newer (preferred) SA format.
1216 */
1217
1218 if (zp->z_is_sa) { /* the easy case, just update the ACL attribute */
1219 locate.cb_aclp = aclp;
1220 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_DACL_ACES(zfsvfs),
1221 zfs_acl_data_locator, &locate, aclp->z_acl_bytes);
1222 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_DACL_COUNT(zfsvfs),
1223 NULL, &aclp->z_acl_count, sizeof (uint64_t));
1224 } else { /* Painful legacy way */
1225 zfs_acl_node_t *aclnode;
1226 uint64_t off = 0;
1227 uint64_t aoid;
1228
1229 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_ZNODE_ACL(zfsvfs),
1230 &acl_phys, sizeof (acl_phys))) != 0)
1231 return (error);
1232
1233 aoid = acl_phys.z_acl_extern_obj;
1234
1235 if (aclp->z_acl_bytes > ZFS_ACE_SPACE) {
1236 /*
1237 * If ACL was previously external and we are now
1238 * converting to new ACL format then release old
1239 * ACL object and create a new one.
1240 */
1241 if (aoid &&
1242 aclp->z_version != acl_phys.z_acl_version) {
1243 error = dmu_object_free(zfsvfs->z_os, aoid, tx);
1244 if (error)
1245 return (error);
1246 aoid = 0;
1247 }
1248 if (aoid == 0) {
1249 aoid = dmu_object_alloc(zfsvfs->z_os,
1250 otype, aclp->z_acl_bytes,
1251 otype == DMU_OT_ACL ?
1252 DMU_OT_SYSACL : DMU_OT_NONE,
1253 otype == DMU_OT_ACL ?
1254 DN_OLD_MAX_BONUSLEN : 0, tx);
1255 } else {
1256 (void) dmu_object_set_blocksize(zfsvfs->z_os,
1257 aoid, aclp->z_acl_bytes, 0, tx);
1258 }
1259 acl_phys.z_acl_extern_obj = aoid;
1260 for (aclnode = list_head(&aclp->z_acl); aclnode;
1261 aclnode = list_next(&aclp->z_acl, aclnode)) {
1262 if (aclnode->z_ace_count == 0)
1263 continue;
1264 dmu_write(zfsvfs->z_os, aoid, off,
1265 aclnode->z_size, aclnode->z_acldata, tx);
1266 off += aclnode->z_size;
1267 }
1268 } else {
1269 void *start = acl_phys.z_ace_data;
1270 /*
1271 * Migrating back embedded?
1272 */
1273 if (acl_phys.z_acl_extern_obj) {
1274 error = dmu_object_free(zfsvfs->z_os,
1275 acl_phys.z_acl_extern_obj, tx);
1276 if (error)
1277 return (error);
1278 acl_phys.z_acl_extern_obj = 0;
1279 }
1280
1281 for (aclnode = list_head(&aclp->z_acl); aclnode;
1282 aclnode = list_next(&aclp->z_acl, aclnode)) {
1283 if (aclnode->z_ace_count == 0)
1284 continue;
1285 bcopy(aclnode->z_acldata, start,
1286 aclnode->z_size);
1287 start = (caddr_t)start + aclnode->z_size;
1288 }
1289 }
1290 /*
1291 * If Old version then swap count/bytes to match old
1292 * layout of znode_acl_phys_t.
1293 */
1294 if (aclp->z_version == ZFS_ACL_VERSION_INITIAL) {
1295 acl_phys.z_acl_size = aclp->z_acl_count;
1296 acl_phys.z_acl_count = aclp->z_acl_bytes;
1297 } else {
1298 acl_phys.z_acl_size = aclp->z_acl_bytes;
1299 acl_phys.z_acl_count = aclp->z_acl_count;
1300 }
1301 acl_phys.z_acl_version = aclp->z_version;
1302
1303 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ZNODE_ACL(zfsvfs), NULL,
1304 &acl_phys, sizeof (acl_phys));
1305 }
1306
1307 /*
1308 * Replace ACL wide bits, but first clear them.
1309 */
1310 zp->z_pflags &= ~ZFS_ACL_WIDE_FLAGS;
1311
1312 zp->z_pflags |= aclp->z_hints;
1313
1314 if (ace_trivial_common(aclp, 0, zfs_ace_walk) == 0)
1315 zp->z_pflags |= ZFS_ACL_TRIVIAL;
1316
1317 zfs_tstamp_update_setup(zp, STATE_CHANGED, NULL, ctime);
1318 return (sa_bulk_update(zp->z_sa_hdl, bulk, count, tx));
1319}
1320
1321static void
1322zfs_acl_chmod(vtype_t vtype, uint64_t mode, boolean_t split, boolean_t trim,
1323 zfs_acl_t *aclp)
1324{
1325 void *acep = NULL;
1326 uint64_t who;
1327 int new_count, new_bytes;
1328 int ace_size;
1329 int entry_type;
1330 uint16_t iflags, type;
1331 uint32_t access_mask;
1332 zfs_acl_node_t *newnode;
1333 size_t abstract_size = aclp->z_ops->ace_abstract_size();
1334 void *zacep;
1335 boolean_t isdir;
1336 trivial_acl_t masks;
1337
1338 new_count = new_bytes = 0;
1339
1340 isdir = (vtype == VDIR);
1341
1342 acl_trivial_access_masks((mode_t)mode, isdir, &masks);
1343
1344 newnode = zfs_acl_node_alloc((abstract_size * 6) + aclp->z_acl_bytes);
1345
1346 zacep = newnode->z_acldata;
1347 if (masks.allow0) {
1348 zfs_set_ace(aclp, zacep, masks.allow0, ALLOW, -1, ACE_OWNER);
1349 zacep = (void *)((uintptr_t)zacep + abstract_size);
1350 new_count++;
1351 new_bytes += abstract_size;
1352 }
1353 if (masks.deny1) {
1354 zfs_set_ace(aclp, zacep, masks.deny1, DENY, -1, ACE_OWNER);
1355 zacep = (void *)((uintptr_t)zacep + abstract_size);
1356 new_count++;
1357 new_bytes += abstract_size;
1358 }
1359 if (masks.deny2) {
1360 zfs_set_ace(aclp, zacep, masks.deny2, DENY, -1, OWNING_GROUP);
1361 zacep = (void *)((uintptr_t)zacep + abstract_size);
1362 new_count++;
1363 new_bytes += abstract_size;
1364 }
1365
1366 while ((acep = zfs_acl_next_ace(aclp, acep, &who, &access_mask,
1367 &iflags, &type))) {
1368 entry_type = (iflags & ACE_TYPE_FLAGS);
1369 /*
1370 * ACEs used to represent the file mode may be divided
1371 * into an equivalent pair of inherit-only and regular
1372 * ACEs, if they are inheritable.
1373 * Skip regular ACEs, which are replaced by the new mode.
1374 */
1375 if (split && (entry_type == ACE_OWNER ||
1376 entry_type == OWNING_GROUP ||
1377 entry_type == ACE_EVERYONE)) {
1378 if (!isdir || !(iflags &
1379 (ACE_FILE_INHERIT_ACE|ACE_DIRECTORY_INHERIT_ACE)))
1380 continue;
1381 /*
1382 * We preserve owner@, group@, or @everyone
1383 * permissions, if they are inheritable, by
1384 * copying them to inherit_only ACEs. This
1385 * prevents inheritable permissions from being
1386 * altered along with the file mode.
1387 */
1388 iflags |= ACE_INHERIT_ONLY_ACE;
1389 }
1390
1391 /*
1392 * If this ACL has any inheritable ACEs, mark that in
1393 * the hints (which are later masked into the pflags)
1394 * so create knows to do inheritance.
1395 */
1396 if (isdir && (iflags &
1397 (ACE_FILE_INHERIT_ACE|ACE_DIRECTORY_INHERIT_ACE)))
1398 aclp->z_hints |= ZFS_INHERIT_ACE;
1399
1400 if ((type != ALLOW && type != DENY) ||
1401 (iflags & ACE_INHERIT_ONLY_ACE)) {
1402 switch (type) {
1403 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
1404 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
1405 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
1406 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
1407 aclp->z_hints |= ZFS_ACL_OBJ_ACE;
1408 break;
1409 }
1410 } else {
1411 /*
1412 * Limit permissions granted by ACEs to be no greater
1413 * than permissions of the requested group mode.
1414 * Applies when the "aclmode" property is set to
1415 * "groupmask".
1416 */
1417 if ((type == ALLOW) && trim)
1418 access_mask &= masks.group;
1419 }
1420 zfs_set_ace(aclp, zacep, access_mask, type, who, iflags);
1421 ace_size = aclp->z_ops->ace_size(acep);
1422 zacep = (void *)((uintptr_t)zacep + ace_size);
1423 new_count++;
1424 new_bytes += ace_size;
1425 }
1426 zfs_set_ace(aclp, zacep, masks.owner, ALLOW, -1, ACE_OWNER);
1427 zacep = (void *)((uintptr_t)zacep + abstract_size);
1428 zfs_set_ace(aclp, zacep, masks.group, ALLOW, -1, OWNING_GROUP);
1429 zacep = (void *)((uintptr_t)zacep + abstract_size);
1430 zfs_set_ace(aclp, zacep, masks.everyone, ALLOW, -1, ACE_EVERYONE);
1431
1432 new_count += 3;
1433 new_bytes += abstract_size * 3;
1434 zfs_acl_release_nodes(aclp);
1435 aclp->z_acl_count = new_count;
1436 aclp->z_acl_bytes = new_bytes;
1437 newnode->z_ace_count = new_count;
1438 newnode->z_size = new_bytes;
1439 list_insert_tail(&aclp->z_acl, newnode);
1440}
1441
1442int
1443zfs_acl_chmod_setattr(znode_t *zp, zfs_acl_t **aclp, uint64_t mode)
1444{
1445 int error = 0;
1446
1447 mutex_enter(&zp->z_acl_lock);
1448 if (zp->z_zfsvfs->z_replay == B_FALSE)
1449 ASSERT_VOP_ELOCKED(ZTOV(zp), __func__);
1450 if (zp->z_zfsvfs->z_acl_mode == ZFS_ACL_DISCARD)
1451 *aclp = zfs_acl_alloc(zfs_acl_version_zp(zp));
1452 else
1453 error = zfs_acl_node_read(zp, B_TRUE, aclp, B_TRUE);
1454
1455 if (error == 0) {
1456 (*aclp)->z_hints = zp->z_pflags & V4_ACL_WIDE_FLAGS;
1457 zfs_acl_chmod(ZTOV(zp)->v_type, mode, B_TRUE,
1458 (zp->z_zfsvfs->z_acl_mode == ZFS_ACL_GROUPMASK), *aclp);
1459 }
1460 mutex_exit(&zp->z_acl_lock);
1461
1462 return (error);
1463}
1464
1465/*
1466 * Should ACE be inherited?
1467 */
1468static int
1469zfs_ace_can_use(vtype_t vtype, uint16_t acep_flags)
1470{
1471 int iflags = (acep_flags & 0xf);
1472
1473 if ((vtype == VDIR) && (iflags & ACE_DIRECTORY_INHERIT_ACE))
1474 return (1);
1475 else if (iflags & ACE_FILE_INHERIT_ACE)
1476 return (!((vtype == VDIR) &&
1477 (iflags & ACE_NO_PROPAGATE_INHERIT_ACE)));
1478 return (0);
1479}
1480
1481/*
1482 * inherit inheritable ACEs from parent
1483 */
1484static zfs_acl_t *
1485zfs_acl_inherit(zfsvfs_t *zfsvfs, vtype_t vtype, zfs_acl_t *paclp,
1486 uint64_t mode, boolean_t *need_chmod)
1487{
1488 void *pacep = NULL;
1489 void *acep;
1490 zfs_acl_node_t *aclnode;
1491 zfs_acl_t *aclp = NULL;
1492 uint64_t who;
1493 uint32_t access_mask;
1494 uint16_t iflags, newflags, type;
1495 size_t ace_size;
1496 void *data1, *data2;
1497 size_t data1sz, data2sz;
1498 uint_t aclinherit;
1499 boolean_t isdir = (vtype == VDIR);
1500 boolean_t isreg = (vtype == VREG);
1501
1502 *need_chmod = B_TRUE;
1503
1504 aclp = zfs_acl_alloc(paclp->z_version);
1505 aclinherit = zfsvfs->z_acl_inherit;
1506 if (aclinherit == ZFS_ACL_DISCARD || vtype == VLNK)
1507 return (aclp);
1508
1509 while ((pacep = zfs_acl_next_ace(paclp, pacep, &who,
1510 &access_mask, &iflags, &type))) {
1511
1512 /*
1513 * don't inherit bogus ACEs
1514 */
1515 if (!zfs_acl_valid_ace_type(type, iflags))
1516 continue;
1517
1518 /*
1519 * Check if ACE is inheritable by this vnode
1520 */
1521 if ((aclinherit == ZFS_ACL_NOALLOW && type == ALLOW) ||
1522 !zfs_ace_can_use(vtype, iflags))
1523 continue;
1524
1525 /*
1526 * If owner@, group@, or everyone@ inheritable
1527 * then zfs_acl_chmod() isn't needed.
1528 */
1529 if ((aclinherit == ZFS_ACL_PASSTHROUGH ||
1530 aclinherit == ZFS_ACL_PASSTHROUGH_X) &&
1531 ((iflags & (ACE_OWNER|ACE_EVERYONE)) ||
1532 ((iflags & OWNING_GROUP) == OWNING_GROUP)) &&
1533 (isreg || (isdir && (iflags & ACE_DIRECTORY_INHERIT_ACE))))
1534 *need_chmod = B_FALSE;
1535
1536 /*
1537 * Strip inherited execute permission from file if
1538 * not in mode
1539 */
1540 if (aclinherit == ZFS_ACL_PASSTHROUGH_X && type == ALLOW &&
1541 !isdir && ((mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0)) {
1542 access_mask &= ~ACE_EXECUTE;
1543 }
1544
1545 /*
1546 * Strip write_acl and write_owner from permissions
1547 * when inheriting an ACE
1548 */
1549 if (aclinherit == ZFS_ACL_RESTRICTED && type == ALLOW) {
1550 access_mask &= ~RESTRICTED_CLEAR;
1551 }
1552
1553 ace_size = aclp->z_ops->ace_size(pacep);
1554 aclnode = zfs_acl_node_alloc(ace_size);
1555 list_insert_tail(&aclp->z_acl, aclnode);
1556 acep = aclnode->z_acldata;
1557
1558 zfs_set_ace(aclp, acep, access_mask, type,
1559 who, iflags|ACE_INHERITED_ACE);
1560
1561 /*
1562 * Copy special opaque data if any
1563 */
1564 if ((data1sz = paclp->z_ops->ace_data(pacep, &data1)) != 0) {
e4efb709
RM		 1565 data2sz = aclp->z_ops->ace_data(acep, &data2);
1566 VERIFY3U(data2sz, ==, data1sz);
9f0a21e6
MM		 1567 bcopy(data1, data2, data2sz);
1568 }
1569
1570 aclp->z_acl_count++;
1571 aclnode->z_ace_count++;
1572 aclp->z_acl_bytes += aclnode->z_size;
1573 newflags = aclp->z_ops->ace_flags_get(acep);
1574
1575 /*
1576 * If ACE is not to be inherited further, or if the vnode is
1577 * not a directory, remove all inheritance flags
1578 */
1579 if (!isdir || (iflags & ACE_NO_PROPAGATE_INHERIT_ACE)) {
1580 newflags &= ~ALL_INHERIT;
1581 aclp->z_ops->ace_flags_set(acep,
1582 newflags|ACE_INHERITED_ACE);
1583 continue;
1584 }
1585
1586 /*
1587 * This directory has an inheritable ACE
1588 */
1589 aclp->z_hints |= ZFS_INHERIT_ACE;
1590
1591 /*
1592 * If only FILE_INHERIT is set then turn on
1593 * inherit_only
1594 */
1595 if ((iflags & (ACE_FILE_INHERIT_ACE |
1596 ACE_DIRECTORY_INHERIT_ACE)) == ACE_FILE_INHERIT_ACE) {
1597 newflags |= ACE_INHERIT_ONLY_ACE;
1598 aclp->z_ops->ace_flags_set(acep,
1599 newflags|ACE_INHERITED_ACE);
1600 } else {
1601 newflags &= ~ACE_INHERIT_ONLY_ACE;
1602 aclp->z_ops->ace_flags_set(acep,
1603 newflags|ACE_INHERITED_ACE);
1604 }
1605 }
a741b386
AW		 1606 if (zfsvfs->z_acl_mode == ZFS_ACL_RESTRICTED &&
1607 aclp->z_acl_count != 0) {
1608 *need_chmod = B_FALSE;
1609 }
9f0a21e6
MM		 1610
1611 return (aclp);
1612}
1613
1614/*
1615 * Create file system object initial permissions
1616 * including inheritable ACEs.
1617 * Also, create FUIDs for owner and group.
1618 */
1619int
1620zfs_acl_ids_create(znode_t *dzp, int flag, vattr_t *vap, cred_t *cr,
1621 vsecattr_t *vsecp, zfs_acl_ids_t *acl_ids)
1622{
1623 int error;
1624 zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
1625 zfs_acl_t *paclp;
1626 gid_t gid;
1627 boolean_t need_chmod = B_TRUE;
1628 boolean_t trim = B_FALSE;
1629 boolean_t inherited = B_FALSE;
1630
1631 if ((flag & IS_ROOT_NODE) == 0) {
1632 if (zfsvfs->z_replay == B_FALSE)
1633 ASSERT_VOP_ELOCKED(ZTOV(dzp), __func__);
1634 } else
e4efb709 1635 ASSERT3P(dzp->z_vnode, ==, NULL);
9f0a21e6
MM		 1636 bzero(acl_ids, sizeof (zfs_acl_ids_t));
1637 acl_ids->z_mode = MAKEIMODE(vap->va_type, vap->va_mode);
1638
1639 if (vsecp)
1640 if ((error = zfs_vsec_2_aclp(zfsvfs, vap->va_type, vsecp, cr,
1641 &acl_ids->z_fuidp, &acl_ids->z_aclp)) != 0)
1642 return (error);
1643 /*
1644 * Determine uid and gid.
1645 */
1646 if ((flag & IS_ROOT_NODE) || zfsvfs->z_replay ||
1647 ((flag & IS_XATTR) && (vap->va_type == VDIR))) {
1648 acl_ids->z_fuid = zfs_fuid_create(zfsvfs,
1649 (uint64_t)vap->va_uid, cr,
1650 ZFS_OWNER, &acl_ids->z_fuidp);
1651 acl_ids->z_fgid = zfs_fuid_create(zfsvfs,
1652 (uint64_t)vap->va_gid, cr,
1653 ZFS_GROUP, &acl_ids->z_fuidp);
1654 gid = vap->va_gid;
1655 } else {
1656 acl_ids->z_fuid = zfs_fuid_create_cred(zfsvfs, ZFS_OWNER,
1657 cr, &acl_ids->z_fuidp);
1658 acl_ids->z_fgid = 0;
1659 if (vap->va_mask & AT_GID) {
1660 acl_ids->z_fgid = zfs_fuid_create(zfsvfs,
1661 (uint64_t)vap->va_gid,
1662 cr, ZFS_GROUP, &acl_ids->z_fuidp);
1663 gid = vap->va_gid;
1664 if (acl_ids->z_fgid != dzp->z_gid &&
1665 !groupmember(vap->va_gid, cr) &&
1666 secpolicy_vnode_create_gid(cr) != 0)
1667 acl_ids->z_fgid = 0;
1668 }
1669 if (acl_ids->z_fgid == 0) {
cfdc432e
MM		 1670 char *domain;
1671 uint32_t rid;
1672
1673 acl_ids->z_fgid = dzp->z_gid;
1674 gid = zfs_fuid_map_id(zfsvfs, acl_ids->z_fgid,
1675 cr, ZFS_GROUP);
1676
1677 if (zfsvfs->z_use_fuids &&
1678 IS_EPHEMERAL(acl_ids->z_fgid)) {
1679 domain =
1680 zfs_fuid_idx_domain(&zfsvfs->z_fuid_idx,
1681 FUID_INDEX(acl_ids->z_fgid));
1682 rid = FUID_RID(acl_ids->z_fgid);
1683 zfs_fuid_node_add(&acl_ids->z_fuidp,
1684 domain, rid, FUID_INDEX(acl_ids->z_fgid),
1685 acl_ids->z_fgid, ZFS_GROUP);
9f0a21e6
MM		 1686 }
1687 }
1688 }
1689
1690 /*
1691 * If we're creating a directory, and the parent directory has the
1692 * set-GID bit set, set in on the new directory.
1693 * Otherwise, if the user is neither privileged nor a member of the
1694 * file's new group, clear the file's set-GID bit.
1695 */
1696
1697 if (!(flag & IS_ROOT_NODE) && (dzp->z_mode & S_ISGID) &&
1698 (vap->va_type == VDIR)) {
1699 acl_ids->z_mode |= S_ISGID;
1700 } else {
1701 if ((acl_ids->z_mode & S_ISGID) &&
1702 secpolicy_vnode_setids_setgids(ZTOV(dzp), cr, gid) != 0)
1703 acl_ids->z_mode &= ~S_ISGID;
1704 }
1705
1706 if (acl_ids->z_aclp == NULL) {
1707 mutex_enter(&dzp->z_acl_lock);
1708 if (!(flag & IS_ROOT_NODE) &&
1709 (dzp->z_pflags & ZFS_INHERIT_ACE) &&
1710 !(dzp->z_pflags & ZFS_XATTR)) {
1711 VERIFY0(zfs_acl_node_read(dzp, B_TRUE,
1712 &paclp, B_FALSE));
1713 acl_ids->z_aclp = zfs_acl_inherit(zfsvfs,
1714 vap->va_type, paclp, acl_ids->z_mode, &need_chmod);
1715 inherited = B_TRUE;
1716 } else {
1717 acl_ids->z_aclp =
1718 zfs_acl_alloc(zfs_acl_version_zp(dzp));
1719 acl_ids->z_aclp->z_hints |= ZFS_ACL_TRIVIAL;
1720 }
1721 mutex_exit(&dzp->z_acl_lock);
1722
1723 if (need_chmod) {
1724 if (vap->va_type == VDIR)
1725 acl_ids->z_aclp->z_hints |=
1726 ZFS_ACL_AUTO_INHERIT;
1727
1728 if (zfsvfs->z_acl_mode == ZFS_ACL_GROUPMASK &&
1729 zfsvfs->z_acl_inherit != ZFS_ACL_PASSTHROUGH &&
1730 zfsvfs->z_acl_inherit != ZFS_ACL_PASSTHROUGH_X)
1731 trim = B_TRUE;
1732 zfs_acl_chmod(vap->va_type, acl_ids->z_mode, B_FALSE,
1733 trim, acl_ids->z_aclp);
1734 }
1735 }
1736
1737 if (inherited || vsecp) {
1738 acl_ids->z_mode = zfs_mode_compute(acl_ids->z_mode,
1739 acl_ids->z_aclp, &acl_ids->z_aclp->z_hints,
1740 acl_ids->z_fuid, acl_ids->z_fgid);
1741 if (ace_trivial_common(acl_ids->z_aclp, 0, zfs_ace_walk) == 0)
1742 acl_ids->z_aclp->z_hints |= ZFS_ACL_TRIVIAL;
1743 }
1744
1745 return (0);
1746}
1747
1748/*
1749 * Free ACL and fuid_infop, but not the acl_ids structure
1750 */
1751void
1752zfs_acl_ids_free(zfs_acl_ids_t *acl_ids)
1753{
1754 if (acl_ids->z_aclp)
1755 zfs_acl_free(acl_ids->z_aclp);
1756 if (acl_ids->z_fuidp)
1757 zfs_fuid_info_free(acl_ids->z_fuidp);
1758 acl_ids->z_aclp = NULL;
1759 acl_ids->z_fuidp = NULL;
1760}
1761
1762boolean_t
1763zfs_acl_ids_overquota(zfsvfs_t *zv, zfs_acl_ids_t *acl_ids, uint64_t projid)
1764{
1765 return (zfs_id_overquota(zv, DMU_USERUSED_OBJECT, acl_ids->z_fuid) ||
1766 zfs_id_overquota(zv, DMU_GROUPUSED_OBJECT, acl_ids->z_fgid) ||
1767 (projid != ZFS_DEFAULT_PROJID && projid != ZFS_INVALID_PROJID &&
1768 zfs_id_overquota(zv, DMU_PROJECTUSED_OBJECT, projid)));
1769}
1770
1771/*
1772 * Retrieve a file's ACL
1773 */
1774int
1775zfs_getacl(znode_t *zp, vsecattr_t *vsecp, boolean_t skipaclchk, cred_t *cr)
1776{
1777 zfs_acl_t *aclp;
1778 ulong_t mask;
1779 int error;
1780 int count = 0;
1781 int largeace = 0;
1782
1783 mask = vsecp->vsa_mask & (VSA_ACE | VSA_ACECNT |
1784 VSA_ACE_ACLFLAGS | VSA_ACE_ALLTYPES);
1785
1786 if (mask == 0)
1787 return (SET_ERROR(ENOSYS));
1788
1789 if ((error = zfs_zaccess(zp, ACE_READ_ACL, 0, skipaclchk, cr)))
1790 return (error);
1791
1792 mutex_enter(&zp->z_acl_lock);
1793
1794 if (zp->z_zfsvfs->z_replay == B_FALSE)
1795 ASSERT_VOP_LOCKED(ZTOV(zp), __func__);
1796 error = zfs_acl_node_read(zp, B_TRUE, &aclp, B_FALSE);
1797 if (error != 0) {
1798 mutex_exit(&zp->z_acl_lock);
1799 return (error);
1800 }
1801
1802 /*
1803 * Scan ACL to determine number of ACEs
1804 */
1805 if ((zp->z_pflags & ZFS_ACL_OBJ_ACE) && !(mask & VSA_ACE_ALLTYPES)) {
1806 void *zacep = NULL;
1807 uint64_t who;
1808 uint32_t access_mask;
1809 uint16_t type, iflags;
1810
1811 while ((zacep = zfs_acl_next_ace(aclp, zacep,
1812 &who, &access_mask, &iflags, &type))) {
1813 switch (type) {
1814 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
1815 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
1816 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
1817 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
1818 largeace++;
1819 continue;
1820 default:
1821 count++;
1822 }
1823 }
1824 vsecp->vsa_aclcnt = count;
1825 } else
1826 count = (int)aclp->z_acl_count;
1827
1828 if (mask & VSA_ACECNT) {
1829 vsecp->vsa_aclcnt = count;
1830 }
1831
1832 if (mask & VSA_ACE) {
1833 size_t aclsz;
1834
1835 aclsz = count * sizeof (ace_t) +
1836 sizeof (ace_object_t) * largeace;
1837
1838 vsecp->vsa_aclentp = kmem_alloc(aclsz, KM_SLEEP);
1839 vsecp->vsa_aclentsz = aclsz;
1840
1841 if (aclp->z_version == ZFS_ACL_VERSION_FUID)
1842 zfs_copy_fuid_2_ace(zp->z_zfsvfs, aclp, cr,
1843 vsecp->vsa_aclentp, !(mask & VSA_ACE_ALLTYPES));
1844 else {
1845 zfs_acl_node_t *aclnode;
1846 void *start = vsecp->vsa_aclentp;
1847
1848 for (aclnode = list_head(&aclp->z_acl); aclnode;
1849 aclnode = list_next(&aclp->z_acl, aclnode)) {
1850 bcopy(aclnode->z_acldata, start,
1851 aclnode->z_size);
1852 start = (caddr_t)start + aclnode->z_size;
1853 }
e4efb709
RM		 1854 ASSERT3U((caddr_t)start - (caddr_t)vsecp->vsa_aclentp,
1855 ==, aclp->z_acl_bytes);
9f0a21e6
MM		 1856 }
1857 }
1858 if (mask & VSA_ACE_ACLFLAGS) {
1859 vsecp->vsa_aclflags = 0;
1860 if (zp->z_pflags & ZFS_ACL_DEFAULTED)
1861 vsecp->vsa_aclflags |= ACL_DEFAULTED;
1862 if (zp->z_pflags & ZFS_ACL_PROTECTED)
1863 vsecp->vsa_aclflags |= ACL_PROTECTED;
1864 if (zp->z_pflags & ZFS_ACL_AUTO_INHERIT)
1865 vsecp->vsa_aclflags |= ACL_AUTO_INHERIT;
1866 }
1867
1868 mutex_exit(&zp->z_acl_lock);
1869
1870 return (0);
1871}
1872
1873int
1874zfs_vsec_2_aclp(zfsvfs_t *zfsvfs, umode_t obj_type,
1875 vsecattr_t *vsecp, cred_t *cr, zfs_fuid_info_t **fuidp, zfs_acl_t **zaclp)
1876{
1877 zfs_acl_t *aclp;
1878 zfs_acl_node_t *aclnode;
1879 int aclcnt = vsecp->vsa_aclcnt;
1880 int error;
1881
1882 if (vsecp->vsa_aclcnt > MAX_ACL_ENTRIES || vsecp->vsa_aclcnt <= 0)
1883 return (SET_ERROR(EINVAL));
1884
1885 aclp = zfs_acl_alloc(zfs_acl_version(zfsvfs->z_version));
1886
1887 aclp->z_hints = 0;
1888 aclnode = zfs_acl_node_alloc(aclcnt * sizeof (zfs_object_ace_t));
1889 if (aclp->z_version == ZFS_ACL_VERSION_INITIAL) {
1890 if ((error = zfs_copy_ace_2_oldace(obj_type, aclp,
1891 (ace_t *)vsecp->vsa_aclentp, aclnode->z_acldata,
1892 aclcnt, &aclnode->z_size)) != 0) {
1893 zfs_acl_free(aclp);
1894 zfs_acl_node_free(aclnode);
1895 return (error);
1896 }
1897 } else {
1898 if ((error = zfs_copy_ace_2_fuid(zfsvfs, obj_type, aclp,
1899 vsecp->vsa_aclentp, aclnode->z_acldata, aclcnt,
1900 &aclnode->z_size, fuidp, cr)) != 0) {
1901 zfs_acl_free(aclp);
1902 zfs_acl_node_free(aclnode);
1903 return (error);
1904 }
1905 }
1906 aclp->z_acl_bytes = aclnode->z_size;
1907 aclnode->z_ace_count = aclcnt;
1908 aclp->z_acl_count = aclcnt;
1909 list_insert_head(&aclp->z_acl, aclnode);
1910
1911 /*
1912 * If flags are being set then add them to z_hints
1913 */
1914 if (vsecp->vsa_mask & VSA_ACE_ACLFLAGS) {
1915 if (vsecp->vsa_aclflags & ACL_PROTECTED)
1916 aclp->z_hints |= ZFS_ACL_PROTECTED;
1917 if (vsecp->vsa_aclflags & ACL_DEFAULTED)
1918 aclp->z_hints |= ZFS_ACL_DEFAULTED;
1919 if (vsecp->vsa_aclflags & ACL_AUTO_INHERIT)
1920 aclp->z_hints |= ZFS_ACL_AUTO_INHERIT;
1921 }
1922
1923 *zaclp = aclp;
1924
1925 return (0);
1926}
1927
1928/*
1929 * Set a file's ACL
1930 */
1931int
1932zfs_setacl(znode_t *zp, vsecattr_t *vsecp, boolean_t skipaclchk, cred_t *cr)
1933{
1934 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1935 zilog_t *zilog = zfsvfs->z_log;
1936 ulong_t mask = vsecp->vsa_mask & (VSA_ACE | VSA_ACECNT);
1937 dmu_tx_t *tx;
1938 int error;
1939 zfs_acl_t *aclp;
1940 zfs_fuid_info_t *fuidp = NULL;
1941 boolean_t fuid_dirtied;
1942 uint64_t acl_obj;
1943
1944 if (zp->z_zfsvfs->z_replay == B_FALSE)
1945 ASSERT_VOP_ELOCKED(ZTOV(zp), __func__);
1946 if (mask == 0)
1947 return (SET_ERROR(ENOSYS));
1948
1949 if (zp->z_pflags & ZFS_IMMUTABLE)
1950 return (SET_ERROR(EPERM));
1951
1952 if ((error = zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr)))
1953 return (error);
1954
1955 error = zfs_vsec_2_aclp(zfsvfs, ZTOV(zp)->v_type, vsecp, cr, &fuidp,
1956 &aclp);
1957 if (error)
1958 return (error);
1959
1960 /*
1961 * If ACL wide flags aren't being set then preserve any
1962 * existing flags.
1963 */
1964 if (!(vsecp->vsa_mask & VSA_ACE_ACLFLAGS)) {
1965 aclp->z_hints |=
1966 (zp->z_pflags & V4_ACL_WIDE_FLAGS);
1967 }
1968top:
1969 mutex_enter(&zp->z_acl_lock);
1970
1971 tx = dmu_tx_create(zfsvfs->z_os);
1972
1973 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
1974
1975 fuid_dirtied = zfsvfs->z_fuid_dirty;
1976 if (fuid_dirtied)
1977 zfs_fuid_txhold(zfsvfs, tx);
1978
1979 /*
1980 * If old version and ACL won't fit in bonus and we aren't
1981 * upgrading then take out necessary DMU holds
1982 */
1983
1984 if ((acl_obj = zfs_external_acl(zp)) != 0) {
1985 if (zfsvfs->z_version >= ZPL_VERSION_FUID &&
1986 zfs_znode_acl_version(zp) <= ZFS_ACL_VERSION_INITIAL) {
1987 dmu_tx_hold_free(tx, acl_obj, 0,
1988 DMU_OBJECT_END);
1989 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0,
1990 aclp->z_acl_bytes);
1991 } else {
1992 dmu_tx_hold_write(tx, acl_obj, 0, aclp->z_acl_bytes);
1993 }
1994 } else if (!zp->z_is_sa && aclp->z_acl_bytes > ZFS_ACE_SPACE) {
1995 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, aclp->z_acl_bytes);
1996 }
1997
1998 zfs_sa_upgrade_txholds(tx, zp);
1999 error = dmu_tx_assign(tx, TXG_NOWAIT);
2000 if (error) {
2001 mutex_exit(&zp->z_acl_lock);
2002
2003 if (error == ERESTART) {
2004 dmu_tx_wait(tx);
2005 dmu_tx_abort(tx);
2006 goto top;
2007 }
2008 dmu_tx_abort(tx);
2009 zfs_acl_free(aclp);
2010 return (error);
2011 }
2012
2013 error = zfs_aclset_common(zp, aclp, cr, tx);
e4efb709
RM		 2014 ASSERT0(error);
2015 ASSERT3P(zp->z_acl_cached, ==, NULL);
9f0a21e6
MM		 2016 zp->z_acl_cached = aclp;
2017
2018 if (fuid_dirtied)
2019 zfs_fuid_sync(zfsvfs, tx);
2020
2021 zfs_log_acl(zilog, tx, zp, vsecp, fuidp);
2022
2023 if (fuidp)
2024 zfs_fuid_info_free(fuidp);
2025 dmu_tx_commit(tx);
2026 mutex_exit(&zp->z_acl_lock);
2027
2028 return (error);
2029}
2030
2031/*
2032 * Check accesses of interest (AoI) against attributes of the dataset
2033 * such as read-only. Returns zero if no AoI conflict with dataset
2034 * attributes, otherwise an appropriate errno is returned.
2035 */
2036static int
2037zfs_zaccess_dataset_check(znode_t *zp, uint32_t v4_mode)
2038{
2039 if ((v4_mode & WRITE_MASK) &&
2040 (zp->z_zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) &&
2041 (!IS_DEVVP(ZTOV(zp)) ||
2042 (IS_DEVVP(ZTOV(zp)) && (v4_mode & WRITE_MASK_ATTRS)))) {
2043 return (SET_ERROR(EROFS));
2044 }
2045
2046 /*
2047 * Intentionally allow ZFS_READONLY through here.
2048 * See zfs_zaccess_common().
2049 */
2050 if ((v4_mode & WRITE_MASK_DATA) &&
2051 (zp->z_pflags & ZFS_IMMUTABLE)) {
2052 return (SET_ERROR(EPERM));
2053 }
2054
2055 /*
2056 * In FreeBSD we allow to modify directory's content is ZFS_NOUNLINK
2057 * (sunlnk) is set. We just don't allow directory removal, which is
2058 * handled in zfs_zaccess_delete().
2059 */
2060 if ((v4_mode & ACE_DELETE) &&
2061 (zp->z_pflags & ZFS_NOUNLINK)) {
2062 return (EPERM);
2063 }
2064
2065 if (((v4_mode & (ACE_READ_DATA|ACE_EXECUTE)) &&
2066 (zp->z_pflags & ZFS_AV_QUARANTINED))) {
2067 return (SET_ERROR(EACCES));
2068 }
2069
2070 return (0);
2071}
2072
2073/*
2074 * The primary usage of this function is to loop through all of the
2075 * ACEs in the znode, determining what accesses of interest (AoI) to
2076 * the caller are allowed or denied. The AoI are expressed as bits in
2077 * the working_mode parameter. As each ACE is processed, bits covered
2078 * by that ACE are removed from the working_mode. This removal
2079 * facilitates two things. The first is that when the working mode is
2080 * empty (= 0), we know we've looked at all the AoI. The second is
2081 * that the ACE interpretation rules don't allow a later ACE to undo
2082 * something granted or denied by an earlier ACE. Removing the
2083 * discovered access or denial enforces this rule. At the end of
2084 * processing the ACEs, all AoI that were found to be denied are
2085 * placed into the working_mode, giving the caller a mask of denied
2086 * accesses. Returns:
2087 * 0 if all AoI granted
2088 * EACCESS if the denied mask is non-zero
2089 * other error if abnormal failure (e.g., IO error)
2090 *
2091 * A secondary usage of the function is to determine if any of the
2092 * AoI are granted. If an ACE grants any access in
2093 * the working_mode, we immediately short circuit out of the function.
2094 * This mode is chosen by setting anyaccess to B_TRUE. The
2095 * working_mode is not a denied access mask upon exit if the function
2096 * is used in this manner.
2097 */
2098static int
2099zfs_zaccess_aces_check(znode_t *zp, uint32_t *working_mode,
2100 boolean_t anyaccess, cred_t *cr)
2101{
2102 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
2103 zfs_acl_t *aclp;
2104 int error;
2105 uid_t uid = crgetuid(cr);
2106 uint64_t who;
2107 uint16_t type, iflags;
2108 uint16_t entry_type;
2109 uint32_t access_mask;
2110 uint32_t deny_mask = 0;
2111 zfs_ace_hdr_t *acep = NULL;
2112 boolean_t checkit;
2113 uid_t gowner;
2114 uid_t fowner;
2115
2116 zfs_fuid_map_ids(zp, cr, &fowner, &gowner);
2117
2118 mutex_enter(&zp->z_acl_lock);
2119
2120 if (zp->z_zfsvfs->z_replay == B_FALSE)
2121 ASSERT_VOP_LOCKED(ZTOV(zp), __func__);
2122 error = zfs_acl_node_read(zp, B_TRUE, &aclp, B_FALSE);
2123 if (error != 0) {
2124 mutex_exit(&zp->z_acl_lock);
2125 return (error);
2126 }
2127
e4efb709 2128 ASSERT3P(zp->z_acl_cached, !=, NULL);
9f0a21e6
MM		 2129
2130 while ((acep = zfs_acl_next_ace(aclp, acep, &who, &access_mask,
2131 &iflags, &type))) {
2132 uint32_t mask_matched;
2133
2134 if (!zfs_acl_valid_ace_type(type, iflags))
2135 continue;
2136
2137 if (ZTOV(zp)->v_type == VDIR && (iflags & ACE_INHERIT_ONLY_ACE))
2138 continue;
2139
2140 /* Skip ACE if it does not affect any AoI */
2141 mask_matched = (access_mask & *working_mode);
2142 if (!mask_matched)
2143 continue;
2144
2145 entry_type = (iflags & ACE_TYPE_FLAGS);
2146
2147 checkit = B_FALSE;
2148
2149 switch (entry_type) {
2150 case ACE_OWNER:
2151 if (uid == fowner)
2152 checkit = B_TRUE;
2153 break;
2154 case OWNING_GROUP:
2155 who = gowner;
9a70e97f 2156 zfs_fallthrough;
9f0a21e6
MM		 2157 case ACE_IDENTIFIER_GROUP:
2158 checkit = zfs_groupmember(zfsvfs, who, cr);
2159 break;
2160 case ACE_EVERYONE:
2161 checkit = B_TRUE;
2162 break;
2163
2164 /* USER Entry */
2165 default:
2166 if (entry_type == 0) {
2167 uid_t newid;
2168
2169 newid = zfs_fuid_map_id(zfsvfs, who, cr,
2170 ZFS_ACE_USER);
2171 if (newid != UID_NOBODY &&
2172 uid == newid)
2173 checkit = B_TRUE;
2174 break;
2175 } else {
2176 mutex_exit(&zp->z_acl_lock);
2177 return (SET_ERROR(EIO));
2178 }
2179 }
2180
2181 if (checkit) {
2182 if (type == DENY) {
2183 DTRACE_PROBE3(zfs__ace__denies,
2184 znode_t *, zp,
2185 zfs_ace_hdr_t *, acep,
2186 uint32_t, mask_matched);
2187 deny_mask |= mask_matched;
2188 } else {
2189 DTRACE_PROBE3(zfs__ace__allows,
2190 znode_t *, zp,
2191 zfs_ace_hdr_t *, acep,
2192 uint32_t, mask_matched);
2193 if (anyaccess) {
2194 mutex_exit(&zp->z_acl_lock);
2195 return (0);
2196 }
2197 }
2198 *working_mode &= ~mask_matched;
2199 }
2200
2201 /* Are we done? */
2202 if (*working_mode == 0)
2203 break;
2204 }
2205
2206 mutex_exit(&zp->z_acl_lock);
2207
2208 /* Put the found 'denies' back on the working mode */
2209 if (deny_mask) {
2210 *working_mode |= deny_mask;
2211 return (SET_ERROR(EACCES));
2212 } else if (*working_mode) {
2213 return (-1);
2214 }
2215
2216 return (0);
2217}
2218
2219/*
2220 * Return true if any access whatsoever granted, we don't actually
2221 * care what access is granted.
2222 */
2223boolean_t
2224zfs_has_access(znode_t *zp, cred_t *cr)
2225{
2226 uint32_t have = ACE_ALL_PERMS;
2227
2228 if (zfs_zaccess_aces_check(zp, &have, B_TRUE, cr) != 0) {
2229 uid_t owner;
2230
2231 owner = zfs_fuid_map_id(zp->z_zfsvfs, zp->z_uid, cr, ZFS_OWNER);
2232 return (secpolicy_vnode_any_access(cr, ZTOV(zp), owner) == 0);
2233 }
2234 return (B_TRUE);
2235}
2236
2237static int
2238zfs_zaccess_common(znode_t *zp, uint32_t v4_mode, uint32_t *working_mode,
2239 boolean_t *check_privs, boolean_t skipaclchk, cred_t *cr)
2240{
2241 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
2242 int err;
2243
2244 *working_mode = v4_mode;
2245 *check_privs = B_TRUE;
2246
2247 /*
2248 * Short circuit empty requests
2249 */
2250 if (v4_mode == 0 || zfsvfs->z_replay) {
2251 *working_mode = 0;
2252 return (0);
2253 }
2254
2255 if ((err = zfs_zaccess_dataset_check(zp, v4_mode)) != 0) {
2256 *check_privs = B_FALSE;
2257 return (err);
2258 }
2259
2260 /*
2261 * The caller requested that the ACL check be skipped. This
2262 * would only happen if the caller checked VOP_ACCESS() with a
2263 * 32 bit ACE mask and already had the appropriate permissions.
2264 */
2265 if (skipaclchk) {
2266 *working_mode = 0;
2267 return (0);
2268 }
2269
2270 /*
2271 * Note: ZFS_READONLY represents the "DOS R/O" attribute.
2272 * When that flag is set, we should behave as if write access
2273 * were not granted by anything in the ACL. In particular:
2274 * We _must_ allow writes after opening the file r/w, then
2275 * setting the DOS R/O attribute, and writing some more.
2276 * (Similar to how you can write after fchmod(fd, 0444).)
2277 *
2278 * Therefore ZFS_READONLY is ignored in the dataset check
2279 * above, and checked here as if part of the ACL check.
2280 * Also note: DOS R/O is ignored for directories.
2281 */
2282 if ((v4_mode & WRITE_MASK_DATA) &&
2283 (ZTOV(zp)->v_type != VDIR) &&
2284 (zp->z_pflags & ZFS_READONLY)) {
2285 return (SET_ERROR(EPERM));
2286 }
2287
2288 return (zfs_zaccess_aces_check(zp, working_mode, B_FALSE, cr));
2289}
2290
2291static int
2292zfs_zaccess_append(znode_t *zp, uint32_t *working_mode, boolean_t *check_privs,
2293 cred_t *cr)
2294{
2295 if (*working_mode != ACE_WRITE_DATA)
2296 return (SET_ERROR(EACCES));
2297
2298 return (zfs_zaccess_common(zp, ACE_APPEND_DATA, working_mode,
2299 check_privs, B_FALSE, cr));
2300}
2301
2302/*
2303 * Check if VEXEC is allowed.
2304 *
2305 * This routine is based on zfs_fastaccesschk_execute which has slowpath
2306 * calling zfs_zaccess. This would be incorrect on FreeBSD (see
2307 * zfs_freebsd_access for the difference). Thus this variant let's the
2308 * caller handle the slowpath (if necessary).
2309 *
2310 * On top of that we perform a lockless check for ZFS_NO_EXECS_DENIED.
2311 *
2312 * Safe access to znode_t is provided by the vnode lock.
2313 */
2314int
2315zfs_fastaccesschk_execute(znode_t *zdp, cred_t *cr)
2316{
9f0a21e6 2317 boolean_t is_attr;
9f0a21e6
MM		 2318
2319 if (zdp->z_pflags & ZFS_AV_QUARANTINED)
2320 return (1);
2321
2322 is_attr = ((zdp->z_pflags & ZFS_XATTR) &&
2323 (ZTOV(zdp)->v_type == VDIR));
2324 if (is_attr)
2325 return (1);
2326
2327 if (zdp->z_pflags & ZFS_NO_EXECS_DENIED)
2328 return (0);
2329
9f0a21e6
MM		 2330 return (1);
2331}
2332
2333
2334/*
2335 * Determine whether Access should be granted/denied.
2336 *
2337 * The least priv subsystem is always consulted as a basic privilege
2338 * can define any form of access.
2339 */
2340int
2341zfs_zaccess(znode_t *zp, int mode, int flags, boolean_t skipaclchk, cred_t *cr)
2342{
2343 uint32_t working_mode;
2344 int error;
2345 int is_attr;
2346 boolean_t check_privs;
2347 znode_t *xzp = NULL;
2348 znode_t *check_zp = zp;
2349 mode_t needed_bits;
2350 uid_t owner;
2351
2352 is_attr = ((zp->z_pflags & ZFS_XATTR) && (ZTOV(zp)->v_type == VDIR));
2353
9f0a21e6
MM		 2354 /*
2355 * In FreeBSD, we don't care about permissions of individual ADS.
2356 * Note that not checking them is not just an optimization - without
2357 * this shortcut, EA operations may bogusly fail with EACCES.
2358 */
2359 if (zp->z_pflags & ZFS_XATTR)
2360 return (0);
9f0a21e6
MM		 2361
2362 owner = zfs_fuid_map_id(zp->z_zfsvfs, zp->z_uid, cr, ZFS_OWNER);
8c0991e8 2363
9f0a21e6
MM		 2364 /*
2365 * Map the bits required to the standard vnode flags VREAD|VWRITE|VEXEC
2366 * in needed_bits. Map the bits mapped by working_mode (currently
2367 * missing) in missing_bits.
2368 * Call secpolicy_vnode_access2() with (needed_bits & ~checkmode),
2369 * needed_bits.
2370 */
2371 needed_bits = 0;
2372
2373 working_mode = mode;
2374 if ((working_mode & (ACE_READ_ACL|ACE_READ_ATTRIBUTES)) &&
2375 owner == crgetuid(cr))
2376 working_mode &= ~(ACE_READ_ACL|ACE_READ_ATTRIBUTES);
2377
2378 if (working_mode & (ACE_READ_DATA|ACE_READ_NAMED_ATTRS|
2379 ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_SYNCHRONIZE))
2380 needed_bits |= VREAD;
2381 if (working_mode & (ACE_WRITE_DATA|ACE_WRITE_NAMED_ATTRS|
2382 ACE_APPEND_DATA|ACE_WRITE_ATTRIBUTES|ACE_SYNCHRONIZE))
2383 needed_bits |= VWRITE;
2384 if (working_mode & ACE_EXECUTE)
2385 needed_bits |= VEXEC;
2386
2387 if ((error = zfs_zaccess_common(check_zp, mode, &working_mode,
2388 &check_privs, skipaclchk, cr)) == 0) {
2389 if (is_attr)
2390 VN_RELE(ZTOV(xzp));
2391 return (secpolicy_vnode_access2(cr, ZTOV(zp), owner,
2392 needed_bits, needed_bits));
2393 }
2394
2395 if (error && !check_privs) {
2396 if (is_attr)
2397 VN_RELE(ZTOV(xzp));
2398 return (error);
2399 }
2400
2401 if (error && (flags & V_APPEND)) {
2402 error = zfs_zaccess_append(zp, &working_mode, &check_privs, cr);
2403 }
2404
2405 if (error && check_privs) {
2406 mode_t checkmode = 0;
2407 vnode_t *check_vp = ZTOV(check_zp);
2408
2409 /*
2410 * First check for implicit owner permission on
2411 * read_acl/read_attributes
2412 */
2413
2414 error = 0;
e4efb709 2415 ASSERT3U(working_mode, !=, 0);
9f0a21e6
MM		 2416
2417 if ((working_mode & (ACE_READ_ACL|ACE_READ_ATTRIBUTES) &&
2418 owner == crgetuid(cr)))
2419 working_mode &= ~(ACE_READ_ACL|ACE_READ_ATTRIBUTES);
2420
2421 if (working_mode & (ACE_READ_DATA|ACE_READ_NAMED_ATTRS|
2422 ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_SYNCHRONIZE))
2423 checkmode |= VREAD;
2424 if (working_mode & (ACE_WRITE_DATA|ACE_WRITE_NAMED_ATTRS|
2425 ACE_APPEND_DATA|ACE_WRITE_ATTRIBUTES|ACE_SYNCHRONIZE))
2426 checkmode |= VWRITE;
2427 if (working_mode & ACE_EXECUTE)
2428 checkmode |= VEXEC;
2429
2430 error = secpolicy_vnode_access2(cr, check_vp, owner,
2431 needed_bits & ~checkmode, needed_bits);
2432
2433 if (error == 0 && (working_mode & ACE_WRITE_OWNER))
2434 error = secpolicy_vnode_chown(check_vp, cr, owner);
2435 if (error == 0 && (working_mode & ACE_WRITE_ACL))
2436 error = secpolicy_vnode_setdac(check_vp, cr, owner);
2437
2438 if (error == 0 && (working_mode &
2439 (ACE_DELETE|ACE_DELETE_CHILD)))
2440 error = secpolicy_vnode_remove(check_vp, cr);
2441
2442 if (error == 0 && (working_mode & ACE_SYNCHRONIZE)) {
2443 error = secpolicy_vnode_chown(check_vp, cr, owner);
2444 }
2445 if (error == 0) {
2446 /*
2447 * See if any bits other than those already checked
2448 * for are still present. If so then return EACCES
2449 */
2450 if (working_mode & ~(ZFS_CHECKED_MASKS)) {
2451 error = SET_ERROR(EACCES);
2452 }
2453 }
2454 } else if (error == 0) {
2455 error = secpolicy_vnode_access2(cr, ZTOV(zp), owner,
2456 needed_bits, needed_bits);
2457 }
2458
2459
2460 if (is_attr)
2461 VN_RELE(ZTOV(xzp));
2462
2463 return (error);
2464}
2465
2466/*
2467 * Translate traditional unix VREAD/VWRITE/VEXEC mode into
485b50bb 2468 * NFSv4-style ZFS ACL format and call zfs_zaccess()
9f0a21e6
MM		 2469 */
2470int
2471zfs_zaccess_rwx(znode_t *zp, mode_t mode, int flags, cred_t *cr)
2472{
2473 return (zfs_zaccess(zp, zfs_unix_to_v4(mode >> 6), flags, B_FALSE, cr));
2474}
2475
2476/*
2477 * Access function for secpolicy_vnode_setattr
2478 */
2479int
2480zfs_zaccess_unix(znode_t *zp, mode_t mode, cred_t *cr)
2481{
2482 int v4_mode = zfs_unix_to_v4(mode >> 6);
2483
2484 return (zfs_zaccess(zp, v4_mode, 0, B_FALSE, cr));
2485}
2486
2487static int
2488zfs_delete_final_check(znode_t *zp, znode_t *dzp,
2489 mode_t available_perms, cred_t *cr)
2490{
2491 int error;
2492 uid_t downer;
2493
2494 downer = zfs_fuid_map_id(dzp->z_zfsvfs, dzp->z_uid, cr, ZFS_OWNER);
2495
2496 error = secpolicy_vnode_access2(cr, ZTOV(dzp),
2497 downer, available_perms, VWRITE|VEXEC);
2498
2499 if (error == 0)
2500 error = zfs_sticky_remove_access(dzp, zp, cr);
2501
2502 return (error);
2503}
2504
2505/*
2506 * Determine whether Access should be granted/deny, without
2507 * consulting least priv subsystem.
2508 *
2509 * The following chart is the recommended NFSv4 enforcement for
2510 * ability to delete an object.
2511 *
2512 * -------------------------------------------------------
2513 * | Parent Dir | Target Object Permissions |
2514 * | permissions | |
2515 * -------------------------------------------------------
2516 * | | ACL Allows | ACL Denies| Delete |
2517 * | | Delete | Delete | unspecified|
2518 * -------------------------------------------------------
2519 * | ACL Allows | Permit | Permit | Permit |
2520 * | DELETE_CHILD | |
2521 * -------------------------------------------------------
2522 * | ACL Denies | Permit | Deny | Deny |
2523 * | DELETE_CHILD | | | |
2524 * -------------------------------------------------------
2525 * | ACL specifies | | | |
2526 * | only allow | Permit | Permit | Permit |
2527 * | write and | | | |
2528 * | execute | | | |
2529 * -------------------------------------------------------
2530 * | ACL denies | | | |
2531 * | write and | Permit | Deny | Deny |
2532 * | execute | | | |
2533 * -------------------------------------------------------
2534 * ^
2535 * |
2536 * No search privilege, can't even look up file?
2537 *
2538 */
2539int
2540zfs_zaccess_delete(znode_t *dzp, znode_t *zp, cred_t *cr)
2541{
2542 uint32_t dzp_working_mode = 0;
2543 uint32_t zp_working_mode = 0;
2544 int dzp_error, zp_error;
2545 mode_t available_perms;
2546 boolean_t dzpcheck_privs = B_TRUE;
2547 boolean_t zpcheck_privs = B_TRUE;
2548
2549 /*
2550 * We want specific DELETE permissions to
2551 * take precedence over WRITE/EXECUTE. We don't
2552 * want an ACL such as this to mess us up.
2553 * user:joe:write_data:deny,user:joe:delete:allow
2554 *
2555 * However, deny permissions may ultimately be overridden
2556 * by secpolicy_vnode_access().
2557 *
2558 * We will ask for all of the necessary permissions and then
2559 * look at the working modes from the directory and target object
2560 * to determine what was found.
2561 */
2562
2563 if (zp->z_pflags & (ZFS_IMMUTABLE | ZFS_NOUNLINK))
2564 return (SET_ERROR(EPERM));
2565
2566 /*
2567 * First row
2568 * If the directory permissions allow the delete, we are done.
2569 */
2570 if ((dzp_error = zfs_zaccess_common(dzp, ACE_DELETE_CHILD,
2571 &dzp_working_mode, &dzpcheck_privs, B_FALSE, cr)) == 0)
2572 return (0);
2573
2574 /*
2575 * If target object has delete permission then we are done
2576 */
2577 if ((zp_error = zfs_zaccess_common(zp, ACE_DELETE, &zp_working_mode,
2578 &zpcheck_privs, B_FALSE, cr)) == 0)
2579 return (0);
2580
e4efb709
RM		 2581 ASSERT(dzp_error);
2582 ASSERT(zp_error);
9f0a21e6
MM		 2583
2584 if (!dzpcheck_privs)
2585 return (dzp_error);
2586 if (!zpcheck_privs)
2587 return (zp_error);
2588
2589 /*
2590 * Second row
2591 *
2592 * If directory returns EACCES then delete_child was denied
2593 * due to deny delete_child. In this case send the request through
2594 * secpolicy_vnode_remove(). We don't use zfs_delete_final_check()
2595 * since that *could* allow the delete based on write/execute permission
2596 * and we want delete permissions to override write/execute.
2597 */
2598
2599 if (dzp_error == EACCES) {
2600 /* XXXPJD: s/dzp/zp/ ? */
2601 return (secpolicy_vnode_remove(ZTOV(dzp), cr));
2602 }
2603 /*
2604 * Third Row
2605 * only need to see if we have write/execute on directory.
2606 */
2607
2608 dzp_error = zfs_zaccess_common(dzp, ACE_EXECUTE|ACE_WRITE_DATA,
2609 &dzp_working_mode, &dzpcheck_privs, B_FALSE, cr);
2610
2611 if (dzp_error != 0 && !dzpcheck_privs)
2612 return (dzp_error);
2613
2614 /*
2615 * Fourth row
2616 */
2617
2618 available_perms = (dzp_working_mode & ACE_WRITE_DATA) ? 0 : VWRITE;
2619 available_perms |= (dzp_working_mode & ACE_EXECUTE) ? 0 : VEXEC;
2620
2621 return (zfs_delete_final_check(zp, dzp, available_perms, cr));
2622
2623}
2624
2625int
2626zfs_zaccess_rename(znode_t *sdzp, znode_t *szp, znode_t *tdzp,
2627 znode_t *tzp, cred_t *cr)
2628{
2629 int add_perm;
2630 int error;
2631
2632 if (szp->z_pflags & ZFS_AV_QUARANTINED)
2633 return (SET_ERROR(EACCES));
2634
2635 add_perm = (ZTOV(szp)->v_type == VDIR) ?
2636 ACE_ADD_SUBDIRECTORY : ACE_ADD_FILE;
2637
2638 /*
2639 * Rename permissions are combination of delete permission +
2640 * add file/subdir permission.
2641 *
2642 * BSD operating systems also require write permission
2643 * on the directory being moved from one parent directory
2644 * to another.
2645 */
2646 if (ZTOV(szp)->v_type == VDIR && ZTOV(sdzp) != ZTOV(tdzp)) {
2647 if ((error = zfs_zaccess(szp, ACE_WRITE_DATA, 0, B_FALSE, cr)))
2648 return (error);
2649 }
2650
2651 /*
2652 * first make sure we do the delete portion.
2653 *
2654 * If that succeeds then check for add_file/add_subdir permissions
2655 */
2656
2657 if ((error = zfs_zaccess_delete(sdzp, szp, cr)))
2658 return (error);
2659
2660 /*
2661 * If we have a tzp, see if we can delete it?
2662 */
2663 if (tzp && (error = zfs_zaccess_delete(tdzp, tzp, cr)))
2664 return (error);
2665
2666 /*
2667 * Now check for add permissions
2668 */
2669 error = zfs_zaccess(tdzp, add_perm, 0, B_FALSE, cr);
2670
2671 return (error);
2672}
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