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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 #include <sys/types.h>
26 #include <sys/param.h>
27 #include <sys/time.h>
28 #include <sys/systm.h>
29 #include <sys/sysmacros.h>
30 #include <sys/resource.h>
31 #include <sys/vfs.h>
32 #include <sys/vnode.h>
33 #include <sys/sid.h>
34 #include <sys/file.h>
35 #include <sys/stat.h>
36 #include <sys/kmem.h>
37 #include <sys/cmn_err.h>
38 #include <sys/errno.h>
39 #include <sys/unistd.h>
40 #include <sys/sdt.h>
41 #include <sys/fs/zfs.h>
42 #include <sys/mode.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_vfsops.h>
49 #include <sys/dmu.h>
50 #include <sys/dnode.h>
51 #include <sys/zap.h>
52 #include <sys/sa.h>
53 #include "fs/fs_subr.h"
54 #include <acl/acl_common.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(zp->z_zfsvfs),
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 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
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(zfsvfs),
379 &size)) != 0)
380 return (error);
381 *aclsize = size;
382 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_DACL_COUNT(zfsvfs),
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(zfsvfs),
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(zp->z_zfsvfs),
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(zp->z_zfsvfs->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(vtype_t obj_type, 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 (obj_type == VDIR &&
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 static zfs_acl_node_t *
646 zfs_acl_curr_node(zfs_acl_t *aclp)
647 {
648 ASSERT(aclp->z_curr_node);
649 return (aclp->z_curr_node);
650 }
651
652 /*
653 * Copy ACE to internal ZFS format.
654 * While processing the ACL each ACE will be validated for correctness.
655 * ACE FUIDs will be created later.
656 */
657 int
658 zfs_copy_ace_2_fuid(zfsvfs_t *zfsvfs, vtype_t obj_type, zfs_acl_t *aclp,
659 void *datap, zfs_ace_t *z_acl, uint64_t aclcnt, size_t *size,
660 zfs_fuid_info_t **fuidp, cred_t *cr)
661 {
662 int i;
663 uint16_t entry_type;
664 zfs_ace_t *aceptr = z_acl;
665 ace_t *acep = datap;
666 zfs_object_ace_t *zobjacep;
667 ace_object_t *aceobjp;
668
669 for (i = 0; i != aclcnt; i++) {
670 aceptr->z_hdr.z_access_mask = acep->a_access_mask;
671 aceptr->z_hdr.z_flags = acep->a_flags;
672 aceptr->z_hdr.z_type = acep->a_type;
673 entry_type = aceptr->z_hdr.z_flags & ACE_TYPE_FLAGS;
674 if (entry_type != ACE_OWNER && entry_type != OWNING_GROUP &&
675 entry_type != ACE_EVERYONE) {
676 aceptr->z_fuid = zfs_fuid_create(zfsvfs, acep->a_who,
677 cr, (entry_type == 0) ?
678 ZFS_ACE_USER : ZFS_ACE_GROUP, fuidp);
679 }
680
681 /*
682 * Make sure ACE is valid
683 */
684 if (zfs_ace_valid(obj_type, aclp, aceptr->z_hdr.z_type,
685 aceptr->z_hdr.z_flags) != B_TRUE)
686 return (EINVAL);
687
688 switch (acep->a_type) {
689 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
690 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
691 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
692 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
693 zobjacep = (zfs_object_ace_t *)aceptr;
694 aceobjp = (ace_object_t *)acep;
695
696 bcopy(aceobjp->a_obj_type, zobjacep->z_object_type,
697 sizeof (aceobjp->a_obj_type));
698 bcopy(aceobjp->a_inherit_obj_type,
699 zobjacep->z_inherit_type,
700 sizeof (aceobjp->a_inherit_obj_type));
701 acep = (ace_t *)((caddr_t)acep + sizeof (ace_object_t));
702 break;
703 default:
704 acep = (ace_t *)((caddr_t)acep + sizeof (ace_t));
705 }
706
707 aceptr = (zfs_ace_t *)((caddr_t)aceptr +
708 aclp->z_ops.ace_size(aceptr));
709 }
710
711 *size = (caddr_t)aceptr - (caddr_t)z_acl;
712
713 return (0);
714 }
715
716 /*
717 * Copy ZFS ACEs to fixed size ace_t layout
718 */
719 static void
720 zfs_copy_fuid_2_ace(zfsvfs_t *zfsvfs, zfs_acl_t *aclp, cred_t *cr,
721 void *datap, int filter)
722 {
723 uint64_t who;
724 uint32_t access_mask;
725 uint16_t iflags, type;
726 zfs_ace_hdr_t *zacep = NULL;
727 ace_t *acep = datap;
728 ace_object_t *objacep;
729 zfs_object_ace_t *zobjacep;
730 size_t ace_size;
731 uint16_t entry_type;
732
733 while (zacep = zfs_acl_next_ace(aclp, zacep,
734 &who, &access_mask, &iflags, &type)) {
735
736 switch (type) {
737 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
738 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
739 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
740 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
741 if (filter) {
742 continue;
743 }
744 zobjacep = (zfs_object_ace_t *)zacep;
745 objacep = (ace_object_t *)acep;
746 bcopy(zobjacep->z_object_type,
747 objacep->a_obj_type,
748 sizeof (zobjacep->z_object_type));
749 bcopy(zobjacep->z_inherit_type,
750 objacep->a_inherit_obj_type,
751 sizeof (zobjacep->z_inherit_type));
752 ace_size = sizeof (ace_object_t);
753 break;
754 default:
755 ace_size = sizeof (ace_t);
756 break;
757 }
758
759 entry_type = (iflags & ACE_TYPE_FLAGS);
760 if ((entry_type != ACE_OWNER &&
761 entry_type != OWNING_GROUP &&
762 entry_type != ACE_EVERYONE)) {
763 acep->a_who = zfs_fuid_map_id(zfsvfs, who,
764 cr, (entry_type & ACE_IDENTIFIER_GROUP) ?
765 ZFS_ACE_GROUP : ZFS_ACE_USER);
766 } else {
767 acep->a_who = (uid_t)(int64_t)who;
768 }
769 acep->a_access_mask = access_mask;
770 acep->a_flags = iflags;
771 acep->a_type = type;
772 acep = (ace_t *)((caddr_t)acep + ace_size);
773 }
774 }
775
776 static int
777 zfs_copy_ace_2_oldace(vtype_t obj_type, zfs_acl_t *aclp, ace_t *acep,
778 zfs_oldace_t *z_acl, int aclcnt, size_t *size)
779 {
780 int i;
781 zfs_oldace_t *aceptr = z_acl;
782
783 for (i = 0; i != aclcnt; i++, aceptr++) {
784 aceptr->z_access_mask = acep[i].a_access_mask;
785 aceptr->z_type = acep[i].a_type;
786 aceptr->z_flags = acep[i].a_flags;
787 aceptr->z_fuid = acep[i].a_who;
788 /*
789 * Make sure ACE is valid
790 */
791 if (zfs_ace_valid(obj_type, aclp, aceptr->z_type,
792 aceptr->z_flags) != B_TRUE)
793 return (EINVAL);
794 }
795 *size = (caddr_t)aceptr - (caddr_t)z_acl;
796 return (0);
797 }
798
799 /*
800 * convert old ACL format to new
801 */
802 void
803 zfs_acl_xform(znode_t *zp, zfs_acl_t *aclp, cred_t *cr)
804 {
805 zfs_oldace_t *oldaclp;
806 int i;
807 uint16_t type, iflags;
808 uint32_t access_mask;
809 uint64_t who;
810 void *cookie = NULL;
811 zfs_acl_node_t *newaclnode;
812
813 ASSERT(aclp->z_version == ZFS_ACL_VERSION_INITIAL);
814 /*
815 * First create the ACE in a contiguous piece of memory
816 * for zfs_copy_ace_2_fuid().
817 *
818 * We only convert an ACL once, so this won't happen
819 * everytime.
820 */
821 oldaclp = kmem_alloc(sizeof (zfs_oldace_t) * aclp->z_acl_count,
822 KM_SLEEP);
823 i = 0;
824 while (cookie = zfs_acl_next_ace(aclp, cookie, &who,
825 &access_mask, &iflags, &type)) {
826 oldaclp[i].z_flags = iflags;
827 oldaclp[i].z_type = type;
828 oldaclp[i].z_fuid = who;
829 oldaclp[i++].z_access_mask = access_mask;
830 }
831
832 newaclnode = zfs_acl_node_alloc(aclp->z_acl_count *
833 sizeof (zfs_object_ace_t));
834 aclp->z_ops = zfs_acl_fuid_ops;
835 VERIFY(zfs_copy_ace_2_fuid(zp->z_zfsvfs, ZTOV(zp)->v_type, aclp,
836 oldaclp, newaclnode->z_acldata, aclp->z_acl_count,
837 &newaclnode->z_size, NULL, cr) == 0);
838 newaclnode->z_ace_count = aclp->z_acl_count;
839 aclp->z_version = ZFS_ACL_VERSION;
840 kmem_free(oldaclp, aclp->z_acl_count * sizeof (zfs_oldace_t));
841
842 /*
843 * Release all previous ACL nodes
844 */
845
846 zfs_acl_release_nodes(aclp);
847
848 list_insert_head(&aclp->z_acl, newaclnode);
849
850 aclp->z_acl_bytes = newaclnode->z_size;
851 aclp->z_acl_count = newaclnode->z_ace_count;
852
853 }
854
855 /*
856 * Convert unix access mask to v4 access mask
857 */
858 static uint32_t
859 zfs_unix_to_v4(uint32_t access_mask)
860 {
861 uint32_t new_mask = 0;
862
863 if (access_mask & S_IXOTH)
864 new_mask |= ACE_EXECUTE;
865 if (access_mask & S_IWOTH)
866 new_mask |= ACE_WRITE_DATA;
867 if (access_mask & S_IROTH)
868 new_mask |= ACE_READ_DATA;
869 return (new_mask);
870 }
871
872 static void
873 zfs_set_ace(zfs_acl_t *aclp, void *acep, uint32_t access_mask,
874 uint16_t access_type, uint64_t fuid, uint16_t entry_type)
875 {
876 uint16_t type = entry_type & ACE_TYPE_FLAGS;
877
878 aclp->z_ops.ace_mask_set(acep, access_mask);
879 aclp->z_ops.ace_type_set(acep, access_type);
880 aclp->z_ops.ace_flags_set(acep, entry_type);
881 if ((type != ACE_OWNER && type != OWNING_GROUP &&
882 type != ACE_EVERYONE))
883 aclp->z_ops.ace_who_set(acep, fuid);
884 }
885
886 /*
887 * Determine mode of file based on ACL.
888 * Also, create FUIDs for any User/Group ACEs
889 */
890 uint64_t
891 zfs_mode_compute(uint64_t fmode, zfs_acl_t *aclp,
892 uint64_t *pflags, uint64_t fuid, uint64_t fgid)
893 {
894 int entry_type;
895 mode_t mode;
896 mode_t seen = 0;
897 zfs_ace_hdr_t *acep = NULL;
898 uint64_t who;
899 uint16_t iflags, type;
900 uint32_t access_mask;
901 boolean_t an_exec_denied = B_FALSE;
902
903 mode = (fmode & (S_IFMT | S_ISUID | S_ISGID | S_ISVTX));
904
905 while (acep = zfs_acl_next_ace(aclp, acep, &who,
906 &access_mask, &iflags, &type)) {
907
908 if (!zfs_acl_valid_ace_type(type, iflags))
909 continue;
910
911 entry_type = (iflags & ACE_TYPE_FLAGS);
912
913 /*
914 * Skip over owner@, group@ or everyone@ inherit only ACEs
915 */
916 if ((iflags & ACE_INHERIT_ONLY_ACE) &&
917 (entry_type == ACE_OWNER || entry_type == ACE_EVERYONE ||
918 entry_type == OWNING_GROUP))
919 continue;
920
921 if (entry_type == ACE_OWNER || (entry_type == 0 &&
922 who == fuid)) {
923 if ((access_mask & ACE_READ_DATA) &&
924 (!(seen & S_IRUSR))) {
925 seen |= S_IRUSR;
926 if (type == ALLOW) {
927 mode |= S_IRUSR;
928 }
929 }
930 if ((access_mask & ACE_WRITE_DATA) &&
931 (!(seen & S_IWUSR))) {
932 seen |= S_IWUSR;
933 if (type == ALLOW) {
934 mode |= S_IWUSR;
935 }
936 }
937 if ((access_mask & ACE_EXECUTE) &&
938 (!(seen & S_IXUSR))) {
939 seen |= S_IXUSR;
940 if (type == ALLOW) {
941 mode |= S_IXUSR;
942 }
943 }
944 } else if (entry_type == OWNING_GROUP ||
945 (entry_type == ACE_IDENTIFIER_GROUP && who == fgid)) {
946 if ((access_mask & ACE_READ_DATA) &&
947 (!(seen & S_IRGRP))) {
948 seen |= S_IRGRP;
949 if (type == ALLOW) {
950 mode |= S_IRGRP;
951 }
952 }
953 if ((access_mask & ACE_WRITE_DATA) &&
954 (!(seen & S_IWGRP))) {
955 seen |= S_IWGRP;
956 if (type == ALLOW) {
957 mode |= S_IWGRP;
958 }
959 }
960 if ((access_mask & ACE_EXECUTE) &&
961 (!(seen & S_IXGRP))) {
962 seen |= S_IXGRP;
963 if (type == ALLOW) {
964 mode |= S_IXGRP;
965 }
966 }
967 } else if (entry_type == ACE_EVERYONE) {
968 if ((access_mask & ACE_READ_DATA)) {
969 if (!(seen & S_IRUSR)) {
970 seen |= S_IRUSR;
971 if (type == ALLOW) {
972 mode |= S_IRUSR;
973 }
974 }
975 if (!(seen & S_IRGRP)) {
976 seen |= S_IRGRP;
977 if (type == ALLOW) {
978 mode |= S_IRGRP;
979 }
980 }
981 if (!(seen & S_IROTH)) {
982 seen |= S_IROTH;
983 if (type == ALLOW) {
984 mode |= S_IROTH;
985 }
986 }
987 }
988 if ((access_mask & ACE_WRITE_DATA)) {
989 if (!(seen & S_IWUSR)) {
990 seen |= S_IWUSR;
991 if (type == ALLOW) {
992 mode |= S_IWUSR;
993 }
994 }
995 if (!(seen & S_IWGRP)) {
996 seen |= S_IWGRP;
997 if (type == ALLOW) {
998 mode |= S_IWGRP;
999 }
1000 }
1001 if (!(seen & S_IWOTH)) {
1002 seen |= S_IWOTH;
1003 if (type == ALLOW) {
1004 mode |= S_IWOTH;
1005 }
1006 }
1007 }
1008 if ((access_mask & ACE_EXECUTE)) {
1009 if (!(seen & S_IXUSR)) {
1010 seen |= S_IXUSR;
1011 if (type == ALLOW) {
1012 mode |= S_IXUSR;
1013 }
1014 }
1015 if (!(seen & S_IXGRP)) {
1016 seen |= S_IXGRP;
1017 if (type == ALLOW) {
1018 mode |= S_IXGRP;
1019 }
1020 }
1021 if (!(seen & S_IXOTH)) {
1022 seen |= S_IXOTH;
1023 if (type == ALLOW) {
1024 mode |= S_IXOTH;
1025 }
1026 }
1027 }
1028 } else {
1029 /*
1030 * Only care if this IDENTIFIER_GROUP or
1031 * USER ACE denies execute access to someone,
1032 * mode is not affected
1033 */
1034 if ((access_mask & ACE_EXECUTE) && type == DENY)
1035 an_exec_denied = B_TRUE;
1036 }
1037 }
1038
1039 /*
1040 * Failure to allow is effectively a deny, so execute permission
1041 * is denied if it was never mentioned or if we explicitly
1042 * weren't allowed it.
1043 */
1044 if (!an_exec_denied &&
1045 ((seen & ALL_MODE_EXECS) != ALL_MODE_EXECS ||
1046 (mode & ALL_MODE_EXECS) != ALL_MODE_EXECS))
1047 an_exec_denied = B_TRUE;
1048
1049 if (an_exec_denied)
1050 *pflags &= ~ZFS_NO_EXECS_DENIED;
1051 else
1052 *pflags |= ZFS_NO_EXECS_DENIED;
1053
1054 return (mode);
1055 }
1056
1057 /*
1058 * Read an external acl object. If the intent is to modify, always
1059 * create a new acl and leave any cached acl in place.
1060 */
1061 static int
1062 zfs_acl_node_read(znode_t *zp, boolean_t have_lock, zfs_acl_t **aclpp,
1063 boolean_t will_modify)
1064 {
1065 zfs_acl_t *aclp;
1066 int aclsize;
1067 int acl_count;
1068 zfs_acl_node_t *aclnode;
1069 zfs_acl_phys_t znode_acl;
1070 int version;
1071 int error;
1072 boolean_t drop_lock = B_FALSE;
1073
1074 ASSERT(MUTEX_HELD(&zp->z_acl_lock));
1075
1076 if (zp->z_acl_cached && !will_modify) {
1077 *aclpp = zp->z_acl_cached;
1078 return (0);
1079 }
1080
1081 /*
1082 * close race where znode could be upgrade while trying to
1083 * read the znode attributes.
1084 *
1085 * But this could only happen if the file isn't already an SA
1086 * znode
1087 */
1088 if (!zp->z_is_sa && !have_lock) {
1089 mutex_enter(&zp->z_lock);
1090 drop_lock = B_TRUE;
1091 }
1092 version = zfs_znode_acl_version(zp);
1093
1094 if ((error = zfs_acl_znode_info(zp, &aclsize,
1095 &acl_count, &znode_acl)) != 0) {
1096 goto done;
1097 }
1098
1099 aclp = zfs_acl_alloc(version);
1100
1101 aclp->z_acl_count = acl_count;
1102 aclp->z_acl_bytes = aclsize;
1103
1104 aclnode = zfs_acl_node_alloc(aclsize);
1105 aclnode->z_ace_count = aclp->z_acl_count;
1106 aclnode->z_size = aclsize;
1107
1108 if (!zp->z_is_sa) {
1109 if (znode_acl.z_acl_extern_obj) {
1110 error = dmu_read(zp->z_zfsvfs->z_os,
1111 znode_acl.z_acl_extern_obj, 0, aclnode->z_size,
1112 aclnode->z_acldata, DMU_READ_PREFETCH);
1113 } else {
1114 bcopy(znode_acl.z_ace_data, aclnode->z_acldata,
1115 aclnode->z_size);
1116 }
1117 } else {
1118 error = sa_lookup(zp->z_sa_hdl, SA_ZPL_DACL_ACES(zp->z_zfsvfs),
1119 aclnode->z_acldata, aclnode->z_size);
1120 }
1121
1122 if (error != 0) {
1123 zfs_acl_free(aclp);
1124 zfs_acl_node_free(aclnode);
1125 /* convert checksum errors into IO errors */
1126 if (error == ECKSUM)
1127 error = EIO;
1128 goto done;
1129 }
1130
1131 list_insert_head(&aclp->z_acl, aclnode);
1132
1133 *aclpp = aclp;
1134 if (!will_modify)
1135 zp->z_acl_cached = aclp;
1136 done:
1137 if (drop_lock)
1138 mutex_exit(&zp->z_lock);
1139 return (error);
1140 }
1141
1142 /*ARGSUSED*/
1143 void
1144 zfs_acl_data_locator(void **dataptr, uint32_t *length, uint32_t buflen,
1145 boolean_t start, void *userdata)
1146 {
1147 zfs_acl_locator_cb_t *cb = (zfs_acl_locator_cb_t *)userdata;
1148
1149 if (start) {
1150 cb->cb_acl_node = list_head(&cb->cb_aclp->z_acl);
1151 } else {
1152 cb->cb_acl_node = list_next(&cb->cb_aclp->z_acl,
1153 cb->cb_acl_node);
1154 }
1155 *dataptr = cb->cb_acl_node->z_acldata;
1156 *length = cb->cb_acl_node->z_size;
1157 }
1158
1159 int
1160 zfs_acl_chown_setattr(znode_t *zp)
1161 {
1162 int error;
1163 zfs_acl_t *aclp;
1164
1165 ASSERT(MUTEX_HELD(&zp->z_lock));
1166 ASSERT(MUTEX_HELD(&zp->z_acl_lock));
1167
1168 if ((error = zfs_acl_node_read(zp, B_TRUE, &aclp, B_FALSE)) == 0)
1169 zp->z_mode = zfs_mode_compute(zp->z_mode, aclp,
1170 &zp->z_pflags, zp->z_uid, zp->z_gid);
1171 return (error);
1172 }
1173
1174 /*
1175 * common code for setting ACLs.
1176 *
1177 * This function is called from zfs_mode_update, zfs_perm_init, and zfs_setacl.
1178 * zfs_setacl passes a non-NULL inherit pointer (ihp) to indicate that it's
1179 * already checked the acl and knows whether to inherit.
1180 */
1181 int
1182 zfs_aclset_common(znode_t *zp, zfs_acl_t *aclp, cred_t *cr, dmu_tx_t *tx)
1183 {
1184 int error;
1185 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1186 dmu_object_type_t otype;
1187 zfs_acl_locator_cb_t locate = { 0 };
1188 uint64_t mode;
1189 sa_bulk_attr_t bulk[5];
1190 uint64_t ctime[2];
1191 int count = 0;
1192
1193 mode = zp->z_mode;
1194
1195 mode = zfs_mode_compute(mode, aclp, &zp->z_pflags,
1196 zp->z_uid, zp->z_gid);
1197
1198 zp->z_mode = mode;
1199 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL,
1200 &mode, sizeof (mode));
1201 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
1202 &zp->z_pflags, sizeof (zp->z_pflags));
1203 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
1204 &ctime, sizeof (ctime));
1205
1206 if (zp->z_acl_cached) {
1207 zfs_acl_free(zp->z_acl_cached);
1208 zp->z_acl_cached = NULL;
1209 }
1210
1211 /*
1212 * Upgrade needed?
1213 */
1214 if (!zfsvfs->z_use_fuids) {
1215 otype = DMU_OT_OLDACL;
1216 } else {
1217 if ((aclp->z_version == ZFS_ACL_VERSION_INITIAL) &&
1218 (zfsvfs->z_version >= ZPL_VERSION_FUID))
1219 zfs_acl_xform(zp, aclp, cr);
1220 ASSERT(aclp->z_version >= ZFS_ACL_VERSION_FUID);
1221 otype = DMU_OT_ACL;
1222 }
1223
1224 /*
1225 * Arrgh, we have to handle old on disk format
1226 * as well as newer (preferred) SA format.
1227 */
1228
1229 if (zp->z_is_sa) { /* the easy case, just update the ACL attribute */
1230 locate.cb_aclp = aclp;
1231 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_DACL_ACES(zfsvfs),
1232 zfs_acl_data_locator, &locate, aclp->z_acl_bytes);
1233 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_DACL_COUNT(zfsvfs),
1234 NULL, &aclp->z_acl_count, sizeof (uint64_t));
1235 } else { /* Painful legacy way */
1236 zfs_acl_node_t *aclnode;
1237 uint64_t off = 0;
1238 zfs_acl_phys_t acl_phys;
1239 uint64_t aoid;
1240
1241 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_ZNODE_ACL(zfsvfs),
1242 &acl_phys, sizeof (acl_phys))) != 0)
1243 return (error);
1244
1245 aoid = acl_phys.z_acl_extern_obj;
1246
1247 if (aclp->z_acl_bytes > ZFS_ACE_SPACE) {
1248 /*
1249 * If ACL was previously external and we are now
1250 * converting to new ACL format then release old
1251 * ACL object and create a new one.
1252 */
1253 if (aoid &&
1254 aclp->z_version != acl_phys.z_acl_version) {
1255 error = dmu_object_free(zfsvfs->z_os, aoid, tx);
1256 if (error)
1257 return (error);
1258 aoid = 0;
1259 }
1260 if (aoid == 0) {
1261 aoid = dmu_object_alloc(zfsvfs->z_os,
1262 otype, aclp->z_acl_bytes,
1263 otype == DMU_OT_ACL ?
1264 DMU_OT_SYSACL : DMU_OT_NONE,
1265 otype == DMU_OT_ACL ?
1266 DN_MAX_BONUSLEN : 0, tx);
1267 } else {
1268 (void) dmu_object_set_blocksize(zfsvfs->z_os,
1269 aoid, aclp->z_acl_bytes, 0, tx);
1270 }
1271 acl_phys.z_acl_extern_obj = aoid;
1272 for (aclnode = list_head(&aclp->z_acl); aclnode;
1273 aclnode = list_next(&aclp->z_acl, aclnode)) {
1274 if (aclnode->z_ace_count == 0)
1275 continue;
1276 dmu_write(zfsvfs->z_os, aoid, off,
1277 aclnode->z_size, aclnode->z_acldata, tx);
1278 off += aclnode->z_size;
1279 }
1280 } else {
1281 void *start = acl_phys.z_ace_data;
1282 /*
1283 * Migrating back embedded?
1284 */
1285 if (acl_phys.z_acl_extern_obj) {
1286 error = dmu_object_free(zfsvfs->z_os,
1287 acl_phys.z_acl_extern_obj, tx);
1288 if (error)
1289 return (error);
1290 acl_phys.z_acl_extern_obj = 0;
1291 }
1292
1293 for (aclnode = list_head(&aclp->z_acl); aclnode;
1294 aclnode = list_next(&aclp->z_acl, aclnode)) {
1295 if (aclnode->z_ace_count == 0)
1296 continue;
1297 bcopy(aclnode->z_acldata, start,
1298 aclnode->z_size);
1299 start = (caddr_t)start + aclnode->z_size;
1300 }
1301 }
1302 /*
1303 * If Old version then swap count/bytes to match old
1304 * layout of znode_acl_phys_t.
1305 */
1306 if (aclp->z_version == ZFS_ACL_VERSION_INITIAL) {
1307 acl_phys.z_acl_size = aclp->z_acl_count;
1308 acl_phys.z_acl_count = aclp->z_acl_bytes;
1309 } else {
1310 acl_phys.z_acl_size = aclp->z_acl_bytes;
1311 acl_phys.z_acl_count = aclp->z_acl_count;
1312 }
1313 acl_phys.z_acl_version = aclp->z_version;
1314
1315 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ZNODE_ACL(zfsvfs), NULL,
1316 &acl_phys, sizeof (acl_phys));
1317 }
1318
1319 /*
1320 * Replace ACL wide bits, but first clear them.
1321 */
1322 zp->z_pflags &= ~ZFS_ACL_WIDE_FLAGS;
1323
1324 zp->z_pflags |= aclp->z_hints;
1325
1326 if (ace_trivial_common(aclp, 0, zfs_ace_walk) == 0)
1327 zp->z_pflags |= ZFS_ACL_TRIVIAL;
1328
1329 zfs_tstamp_update_setup(zp, STATE_CHANGED, NULL, ctime, B_TRUE);
1330 return (sa_bulk_update(zp->z_sa_hdl, bulk, count, tx));
1331 }
1332
1333 /*
1334 * Update access mask for prepended ACE
1335 *
1336 * This applies the "groupmask" value for aclmode property.
1337 */
1338 static void
1339 zfs_acl_prepend_fixup(zfs_acl_t *aclp, void *acep, void *origacep,
1340 mode_t mode, uint64_t owner)
1341 {
1342 int rmask, wmask, xmask;
1343 int user_ace;
1344 uint16_t aceflags;
1345 uint32_t origmask, acepmask;
1346 uint64_t fuid;
1347
1348 aceflags = aclp->z_ops.ace_flags_get(acep);
1349 fuid = aclp->z_ops.ace_who_get(acep);
1350 origmask = aclp->z_ops.ace_mask_get(origacep);
1351 acepmask = aclp->z_ops.ace_mask_get(acep);
1352
1353 user_ace = (!(aceflags &
1354 (ACE_OWNER|ACE_GROUP|ACE_IDENTIFIER_GROUP)));
1355
1356 if (user_ace && (fuid == owner)) {
1357 rmask = S_IRUSR;
1358 wmask = S_IWUSR;
1359 xmask = S_IXUSR;
1360 } else {
1361 rmask = S_IRGRP;
1362 wmask = S_IWGRP;
1363 xmask = S_IXGRP;
1364 }
1365
1366 if (origmask & ACE_READ_DATA) {
1367 if (mode & rmask) {
1368 acepmask &= ~ACE_READ_DATA;
1369 } else {
1370 acepmask |= ACE_READ_DATA;
1371 }
1372 }
1373
1374 if (origmask & ACE_WRITE_DATA) {
1375 if (mode & wmask) {
1376 acepmask &= ~ACE_WRITE_DATA;
1377 } else {
1378 acepmask |= ACE_WRITE_DATA;
1379 }
1380 }
1381
1382 if (origmask & ACE_APPEND_DATA) {
1383 if (mode & wmask) {
1384 acepmask &= ~ACE_APPEND_DATA;
1385 } else {
1386 acepmask |= ACE_APPEND_DATA;
1387 }
1388 }
1389
1390 if (origmask & ACE_EXECUTE) {
1391 if (mode & xmask) {
1392 acepmask &= ~ACE_EXECUTE;
1393 } else {
1394 acepmask |= ACE_EXECUTE;
1395 }
1396 }
1397 aclp->z_ops.ace_mask_set(acep, acepmask);
1398 }
1399
1400 static void
1401 zfs_acl_chmod(zfsvfs_t *zfsvfs, uint64_t mode, zfs_acl_t *aclp)
1402 {
1403 void *acep = NULL;
1404 uint64_t who;
1405 int new_count, new_bytes;
1406 int ace_size;
1407 int entry_type;
1408 uint16_t iflags, type;
1409 uint32_t access_mask;
1410 zfs_acl_node_t *newnode;
1411 size_t abstract_size = aclp->z_ops.ace_abstract_size();
1412 void *zacep;
1413 uint32_t owner, group, everyone;
1414 uint32_t deny1, deny2, allow0;
1415
1416 new_count = new_bytes = 0;
1417
1418 acl_trivial_access_masks((mode_t)mode, &allow0, &deny1, &deny2,
1419 &owner, &group, &everyone);
1420
1421 newnode = zfs_acl_node_alloc((abstract_size * 6) + aclp->z_acl_bytes);
1422
1423 zacep = newnode->z_acldata;
1424 if (allow0) {
1425 zfs_set_ace(aclp, zacep, allow0, ALLOW, -1, ACE_OWNER);
1426 zacep = (void *)((uintptr_t)zacep + abstract_size);
1427 new_count++;
1428 new_bytes += abstract_size;
1429 } if (deny1) {
1430 zfs_set_ace(aclp, zacep, deny1, DENY, -1, ACE_OWNER);
1431 zacep = (void *)((uintptr_t)zacep + abstract_size);
1432 new_count++;
1433 new_bytes += abstract_size;
1434 }
1435 if (deny2) {
1436 zfs_set_ace(aclp, zacep, deny2, DENY, -1, OWNING_GROUP);
1437 zacep = (void *)((uintptr_t)zacep + abstract_size);
1438 new_count++;
1439 new_bytes += abstract_size;
1440 }
1441
1442 while (acep = zfs_acl_next_ace(aclp, acep, &who, &access_mask,
1443 &iflags, &type)) {
1444 uint16_t inherit_flags;
1445
1446 entry_type = (iflags & ACE_TYPE_FLAGS);
1447 inherit_flags = (iflags & ALL_INHERIT);
1448
1449 if ((entry_type == ACE_OWNER || entry_type == ACE_EVERYONE ||
1450 (entry_type == OWNING_GROUP)) &&
1451 ((inherit_flags & ACE_INHERIT_ONLY_ACE) == 0)) {
1452 continue;
1453 }
1454
1455 if ((type != ALLOW && type != DENY) ||
1456 (inherit_flags & ACE_INHERIT_ONLY_ACE)) {
1457 if (inherit_flags)
1458 aclp->z_hints |= ZFS_INHERIT_ACE;
1459 switch (type) {
1460 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
1461 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
1462 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
1463 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
1464 aclp->z_hints |= ZFS_ACL_OBJ_ACE;
1465 break;
1466 }
1467 } else {
1468
1469 /*
1470 * Limit permissions to be no greater than
1471 * group permissions
1472 */
1473 if (zfsvfs->z_acl_inherit == ZFS_ACL_RESTRICTED) {
1474 if (!(mode & S_IRGRP))
1475 access_mask &= ~ACE_READ_DATA;
1476 if (!(mode & S_IWGRP))
1477 access_mask &=
1478 ~(ACE_WRITE_DATA|ACE_APPEND_DATA);
1479 if (!(mode & S_IXGRP))
1480 access_mask &= ~ACE_EXECUTE;
1481 access_mask &=
1482 ~(ACE_WRITE_OWNER|ACE_WRITE_ACL|
1483 ACE_WRITE_ATTRIBUTES|ACE_WRITE_NAMED_ATTRS);
1484 }
1485 }
1486 zfs_set_ace(aclp, zacep, access_mask, type, who, iflags);
1487 ace_size = aclp->z_ops.ace_size(acep);
1488 zacep = (void *)((uintptr_t)zacep + ace_size);
1489 new_count++;
1490 new_bytes += ace_size;
1491 }
1492 zfs_set_ace(aclp, zacep, owner, 0, -1, ACE_OWNER);
1493 zacep = (void *)((uintptr_t)zacep + abstract_size);
1494 zfs_set_ace(aclp, zacep, group, 0, -1, OWNING_GROUP);
1495 zacep = (void *)((uintptr_t)zacep + abstract_size);
1496 zfs_set_ace(aclp, zacep, everyone, 0, -1, ACE_EVERYONE);
1497
1498 new_count += 3;
1499 new_bytes += abstract_size * 3;
1500 zfs_acl_release_nodes(aclp);
1501 aclp->z_acl_count = new_count;
1502 aclp->z_acl_bytes = new_bytes;
1503 newnode->z_ace_count = new_count;
1504 newnode->z_size = new_bytes;
1505 list_insert_tail(&aclp->z_acl, newnode);
1506 }
1507
1508 void
1509 zfs_acl_chmod_setattr(znode_t *zp, zfs_acl_t **aclp, uint64_t mode)
1510 {
1511 mutex_enter(&zp->z_acl_lock);
1512 mutex_enter(&zp->z_lock);
1513 *aclp = zfs_acl_alloc(zfs_acl_version_zp(zp));
1514 (*aclp)->z_hints = zp->z_pflags & V4_ACL_WIDE_FLAGS;
1515 zfs_acl_chmod(zp->z_zfsvfs, mode, *aclp);
1516 mutex_exit(&zp->z_lock);
1517 mutex_exit(&zp->z_acl_lock);
1518 ASSERT(*aclp);
1519 }
1520
1521 /*
1522 * strip off write_owner and write_acl
1523 */
1524 static void
1525 zfs_restricted_update(zfsvfs_t *zfsvfs, zfs_acl_t *aclp, void *acep)
1526 {
1527 uint32_t mask = aclp->z_ops.ace_mask_get(acep);
1528
1529 if ((zfsvfs->z_acl_inherit == ZFS_ACL_RESTRICTED) &&
1530 (aclp->z_ops.ace_type_get(acep) == ALLOW)) {
1531 mask &= ~RESTRICTED_CLEAR;
1532 aclp->z_ops.ace_mask_set(acep, mask);
1533 }
1534 }
1535
1536 /*
1537 * Should ACE be inherited?
1538 */
1539 static int
1540 zfs_ace_can_use(vtype_t vtype, uint16_t acep_flags)
1541 {
1542 int iflags = (acep_flags & 0xf);
1543
1544 if ((vtype == VDIR) && (iflags & ACE_DIRECTORY_INHERIT_ACE))
1545 return (1);
1546 else if (iflags & ACE_FILE_INHERIT_ACE)
1547 return (!((vtype == VDIR) &&
1548 (iflags & ACE_NO_PROPAGATE_INHERIT_ACE)));
1549 return (0);
1550 }
1551
1552 /*
1553 * inherit inheritable ACEs from parent
1554 */
1555 static zfs_acl_t *
1556 zfs_acl_inherit(zfsvfs_t *zfsvfs, vtype_t vtype, zfs_acl_t *paclp,
1557 uint64_t mode, boolean_t *need_chmod)
1558 {
1559 void *pacep;
1560 void *acep;
1561 zfs_acl_node_t *aclnode;
1562 zfs_acl_t *aclp = NULL;
1563 uint64_t who;
1564 uint32_t access_mask;
1565 uint16_t iflags, newflags, type;
1566 size_t ace_size;
1567 void *data1, *data2;
1568 size_t data1sz, data2sz;
1569 boolean_t vdir = vtype == VDIR;
1570 boolean_t vreg = vtype == VREG;
1571 boolean_t passthrough, passthrough_x, noallow;
1572
1573 passthrough_x =
1574 zfsvfs->z_acl_inherit == ZFS_ACL_PASSTHROUGH_X;
1575 passthrough = passthrough_x ||
1576 zfsvfs->z_acl_inherit == ZFS_ACL_PASSTHROUGH;
1577 noallow =
1578 zfsvfs->z_acl_inherit == ZFS_ACL_NOALLOW;
1579
1580 *need_chmod = B_TRUE;
1581 pacep = NULL;
1582 aclp = zfs_acl_alloc(paclp->z_version);
1583 if (zfsvfs->z_acl_inherit == ZFS_ACL_DISCARD || vtype == VLNK)
1584 return (aclp);
1585 while (pacep = zfs_acl_next_ace(paclp, pacep, &who,
1586 &access_mask, &iflags, &type)) {
1587
1588 /*
1589 * don't inherit bogus ACEs
1590 */
1591 if (!zfs_acl_valid_ace_type(type, iflags))
1592 continue;
1593
1594 if (noallow && type == ALLOW)
1595 continue;
1596
1597 ace_size = aclp->z_ops.ace_size(pacep);
1598
1599 if (!zfs_ace_can_use(vtype, iflags))
1600 continue;
1601
1602 /*
1603 * If owner@, group@, or everyone@ inheritable
1604 * then zfs_acl_chmod() isn't needed.
1605 */
1606 if (passthrough &&
1607 ((iflags & (ACE_OWNER|ACE_EVERYONE)) ||
1608 ((iflags & OWNING_GROUP) ==
1609 OWNING_GROUP)) && (vreg || (vdir && (iflags &
1610 ACE_DIRECTORY_INHERIT_ACE)))) {
1611 *need_chmod = B_FALSE;
1612 }
1613
1614 if (!vdir && passthrough_x &&
1615 ((mode & (S_IXUSR | S_IXGRP | S_IXOTH)) == 0)) {
1616 access_mask &= ~ACE_EXECUTE;
1617 }
1618
1619 aclnode = zfs_acl_node_alloc(ace_size);
1620 list_insert_tail(&aclp->z_acl, aclnode);
1621 acep = aclnode->z_acldata;
1622
1623 zfs_set_ace(aclp, acep, access_mask, type,
1624 who, iflags|ACE_INHERITED_ACE);
1625
1626 /*
1627 * Copy special opaque data if any
1628 */
1629 if ((data1sz = paclp->z_ops.ace_data(pacep, &data1)) != 0) {
1630 VERIFY((data2sz = aclp->z_ops.ace_data(acep,
1631 &data2)) == data1sz);
1632 bcopy(data1, data2, data2sz);
1633 }
1634
1635 aclp->z_acl_count++;
1636 aclnode->z_ace_count++;
1637 aclp->z_acl_bytes += aclnode->z_size;
1638 newflags = aclp->z_ops.ace_flags_get(acep);
1639
1640 if (vdir)
1641 aclp->z_hints |= ZFS_INHERIT_ACE;
1642
1643 if ((iflags & ACE_NO_PROPAGATE_INHERIT_ACE) || !vdir) {
1644 newflags &= ~ALL_INHERIT;
1645 aclp->z_ops.ace_flags_set(acep,
1646 newflags|ACE_INHERITED_ACE);
1647 zfs_restricted_update(zfsvfs, aclp, acep);
1648 continue;
1649 }
1650
1651 ASSERT(vdir);
1652
1653 /*
1654 * If only FILE_INHERIT is set then turn on
1655 * inherit_only
1656 */
1657 if ((iflags & (ACE_FILE_INHERIT_ACE |
1658 ACE_DIRECTORY_INHERIT_ACE)) == ACE_FILE_INHERIT_ACE) {
1659 newflags |= ACE_INHERIT_ONLY_ACE;
1660 aclp->z_ops.ace_flags_set(acep,
1661 newflags|ACE_INHERITED_ACE);
1662 } else {
1663 newflags &= ~ACE_INHERIT_ONLY_ACE;
1664 aclp->z_ops.ace_flags_set(acep,
1665 newflags|ACE_INHERITED_ACE);
1666 }
1667 }
1668 return (aclp);
1669 }
1670
1671 /*
1672 * Create file system object initial permissions
1673 * including inheritable ACEs.
1674 */
1675 int
1676 zfs_acl_ids_create(znode_t *dzp, int flag, vattr_t *vap, cred_t *cr,
1677 vsecattr_t *vsecp, zfs_acl_ids_t *acl_ids)
1678 {
1679 int error;
1680 zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
1681 zfs_acl_t *paclp;
1682 gid_t gid;
1683 boolean_t need_chmod = B_TRUE;
1684 boolean_t inherited = B_FALSE;
1685
1686 bzero(acl_ids, sizeof (zfs_acl_ids_t));
1687 acl_ids->z_mode = MAKEIMODE(vap->va_type, vap->va_mode);
1688
1689 if (vsecp)
1690 if ((error = zfs_vsec_2_aclp(zfsvfs, vap->va_type, vsecp, cr,
1691 &acl_ids->z_fuidp, &acl_ids->z_aclp)) != 0)
1692 return (error);
1693 /*
1694 * Determine uid and gid.
1695 */
1696 if ((flag & IS_ROOT_NODE) || zfsvfs->z_replay ||
1697 ((flag & IS_XATTR) && (vap->va_type == VDIR))) {
1698 acl_ids->z_fuid = zfs_fuid_create(zfsvfs,
1699 (uint64_t)vap->va_uid, cr,
1700 ZFS_OWNER, &acl_ids->z_fuidp);
1701 acl_ids->z_fgid = zfs_fuid_create(zfsvfs,
1702 (uint64_t)vap->va_gid, cr,
1703 ZFS_GROUP, &acl_ids->z_fuidp);
1704 gid = vap->va_gid;
1705 } else {
1706 acl_ids->z_fuid = zfs_fuid_create_cred(zfsvfs, ZFS_OWNER,
1707 cr, &acl_ids->z_fuidp);
1708 acl_ids->z_fgid = 0;
1709 if (vap->va_mask & AT_GID) {
1710 acl_ids->z_fgid = zfs_fuid_create(zfsvfs,
1711 (uint64_t)vap->va_gid,
1712 cr, ZFS_GROUP, &acl_ids->z_fuidp);
1713 gid = vap->va_gid;
1714 if (acl_ids->z_fgid != dzp->z_gid &&
1715 !groupmember(vap->va_gid, cr) &&
1716 secpolicy_vnode_create_gid(cr) != 0)
1717 acl_ids->z_fgid = 0;
1718 }
1719 if (acl_ids->z_fgid == 0) {
1720 if (dzp->z_mode & S_ISGID) {
1721 char *domain;
1722 uint32_t rid;
1723
1724 acl_ids->z_fgid = dzp->z_gid;
1725 gid = zfs_fuid_map_id(zfsvfs, acl_ids->z_fgid,
1726 cr, ZFS_GROUP);
1727
1728 if (zfsvfs->z_use_fuids &&
1729 IS_EPHEMERAL(acl_ids->z_fgid)) {
1730 domain = zfs_fuid_idx_domain(
1731 &zfsvfs->z_fuid_idx,
1732 FUID_INDEX(acl_ids->z_fgid));
1733 rid = FUID_RID(acl_ids->z_fgid);
1734 zfs_fuid_node_add(&acl_ids->z_fuidp,
1735 domain, rid,
1736 FUID_INDEX(acl_ids->z_fgid),
1737 acl_ids->z_fgid, ZFS_GROUP);
1738 }
1739 } else {
1740 acl_ids->z_fgid = zfs_fuid_create_cred(zfsvfs,
1741 ZFS_GROUP, cr, &acl_ids->z_fuidp);
1742 gid = crgetgid(cr);
1743 }
1744 }
1745 }
1746
1747 /*
1748 * If we're creating a directory, and the parent directory has the
1749 * set-GID bit set, set in on the new directory.
1750 * Otherwise, if the user is neither privileged nor a member of the
1751 * file's new group, clear the file's set-GID bit.
1752 */
1753
1754 if (!(flag & IS_ROOT_NODE) && (dzp->z_mode & S_ISGID) &&
1755 (vap->va_type == VDIR)) {
1756 acl_ids->z_mode |= S_ISGID;
1757 } else {
1758 if ((acl_ids->z_mode & S_ISGID) &&
1759 secpolicy_vnode_setids_setgids(cr, gid) != 0)
1760 acl_ids->z_mode &= ~S_ISGID;
1761 }
1762
1763 if (acl_ids->z_aclp == NULL) {
1764 mutex_enter(&dzp->z_acl_lock);
1765 mutex_enter(&dzp->z_lock);
1766 if (!(flag & IS_ROOT_NODE) && (ZTOV(dzp)->v_type == VDIR &&
1767 (dzp->z_pflags & ZFS_INHERIT_ACE)) &&
1768 !(dzp->z_pflags & ZFS_XATTR)) {
1769 VERIFY(0 == zfs_acl_node_read(dzp, B_TRUE,
1770 &paclp, B_FALSE));
1771 acl_ids->z_aclp = zfs_acl_inherit(zfsvfs,
1772 vap->va_type, paclp, acl_ids->z_mode, &need_chmod);
1773 inherited = B_TRUE;
1774 } else {
1775 acl_ids->z_aclp =
1776 zfs_acl_alloc(zfs_acl_version_zp(dzp));
1777 acl_ids->z_aclp->z_hints |= ZFS_ACL_TRIVIAL;
1778 }
1779 mutex_exit(&dzp->z_lock);
1780 mutex_exit(&dzp->z_acl_lock);
1781 if (need_chmod) {
1782 acl_ids->z_aclp->z_hints |= (vap->va_type == VDIR) ?
1783 ZFS_ACL_AUTO_INHERIT : 0;
1784 zfs_acl_chmod(zfsvfs, acl_ids->z_mode, acl_ids->z_aclp);
1785 }
1786 }
1787
1788 if (inherited || vsecp) {
1789 acl_ids->z_mode = zfs_mode_compute(acl_ids->z_mode,
1790 acl_ids->z_aclp, &acl_ids->z_aclp->z_hints,
1791 acl_ids->z_fuid, acl_ids->z_fgid);
1792 if (ace_trivial_common(acl_ids->z_aclp, 0, zfs_ace_walk) == 0)
1793 acl_ids->z_aclp->z_hints |= ZFS_ACL_TRIVIAL;
1794 }
1795
1796 return (0);
1797 }
1798
1799 /*
1800 * Free ACL and fuid_infop, but not the acl_ids structure
1801 */
1802 void
1803 zfs_acl_ids_free(zfs_acl_ids_t *acl_ids)
1804 {
1805 if (acl_ids->z_aclp)
1806 zfs_acl_free(acl_ids->z_aclp);
1807 if (acl_ids->z_fuidp)
1808 zfs_fuid_info_free(acl_ids->z_fuidp);
1809 acl_ids->z_aclp = NULL;
1810 acl_ids->z_fuidp = NULL;
1811 }
1812
1813 boolean_t
1814 zfs_acl_ids_overquota(zfsvfs_t *zfsvfs, zfs_acl_ids_t *acl_ids)
1815 {
1816 return (zfs_fuid_overquota(zfsvfs, B_FALSE, acl_ids->z_fuid) ||
1817 zfs_fuid_overquota(zfsvfs, B_TRUE, acl_ids->z_fgid));
1818 }
1819
1820 /*
1821 * Retrieve a files ACL
1822 */
1823 int
1824 zfs_getacl(znode_t *zp, vsecattr_t *vsecp, boolean_t skipaclchk, cred_t *cr)
1825 {
1826 zfs_acl_t *aclp;
1827 ulong_t mask;
1828 int error;
1829 int count = 0;
1830 int largeace = 0;
1831
1832 mask = vsecp->vsa_mask & (VSA_ACE | VSA_ACECNT |
1833 VSA_ACE_ACLFLAGS | VSA_ACE_ALLTYPES);
1834
1835 if (mask == 0)
1836 return (ENOSYS);
1837
1838 if (error = zfs_zaccess(zp, ACE_READ_ACL, 0, skipaclchk, cr))
1839 return (error);
1840
1841 mutex_enter(&zp->z_acl_lock);
1842
1843 error = zfs_acl_node_read(zp, B_FALSE, &aclp, B_FALSE);
1844 if (error != 0) {
1845 mutex_exit(&zp->z_acl_lock);
1846 return (error);
1847 }
1848
1849 /*
1850 * Scan ACL to determine number of ACEs
1851 */
1852 if ((zp->z_pflags & ZFS_ACL_OBJ_ACE) && !(mask & VSA_ACE_ALLTYPES)) {
1853 void *zacep = NULL;
1854 uint64_t who;
1855 uint32_t access_mask;
1856 uint16_t type, iflags;
1857
1858 while (zacep = zfs_acl_next_ace(aclp, zacep,
1859 &who, &access_mask, &iflags, &type)) {
1860 switch (type) {
1861 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
1862 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
1863 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
1864 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
1865 largeace++;
1866 continue;
1867 default:
1868 count++;
1869 }
1870 }
1871 vsecp->vsa_aclcnt = count;
1872 } else
1873 count = (int)aclp->z_acl_count;
1874
1875 if (mask & VSA_ACECNT) {
1876 vsecp->vsa_aclcnt = count;
1877 }
1878
1879 if (mask & VSA_ACE) {
1880 size_t aclsz;
1881
1882 aclsz = count * sizeof (ace_t) +
1883 sizeof (ace_object_t) * largeace;
1884
1885 vsecp->vsa_aclentp = kmem_alloc(aclsz, KM_SLEEP);
1886 vsecp->vsa_aclentsz = aclsz;
1887
1888 if (aclp->z_version == ZFS_ACL_VERSION_FUID)
1889 zfs_copy_fuid_2_ace(zp->z_zfsvfs, aclp, cr,
1890 vsecp->vsa_aclentp, !(mask & VSA_ACE_ALLTYPES));
1891 else {
1892 zfs_acl_node_t *aclnode;
1893 void *start = vsecp->vsa_aclentp;
1894
1895 for (aclnode = list_head(&aclp->z_acl); aclnode;
1896 aclnode = list_next(&aclp->z_acl, aclnode)) {
1897 bcopy(aclnode->z_acldata, start,
1898 aclnode->z_size);
1899 start = (caddr_t)start + aclnode->z_size;
1900 }
1901 ASSERT((caddr_t)start - (caddr_t)vsecp->vsa_aclentp ==
1902 aclp->z_acl_bytes);
1903 }
1904 }
1905 if (mask & VSA_ACE_ACLFLAGS) {
1906 vsecp->vsa_aclflags = 0;
1907 if (zp->z_pflags & ZFS_ACL_DEFAULTED)
1908 vsecp->vsa_aclflags |= ACL_DEFAULTED;
1909 if (zp->z_pflags & ZFS_ACL_PROTECTED)
1910 vsecp->vsa_aclflags |= ACL_PROTECTED;
1911 if (zp->z_pflags & ZFS_ACL_AUTO_INHERIT)
1912 vsecp->vsa_aclflags |= ACL_AUTO_INHERIT;
1913 }
1914
1915 mutex_exit(&zp->z_acl_lock);
1916
1917 return (0);
1918 }
1919
1920 int
1921 zfs_vsec_2_aclp(zfsvfs_t *zfsvfs, vtype_t obj_type,
1922 vsecattr_t *vsecp, cred_t *cr, zfs_fuid_info_t **fuidp, zfs_acl_t **zaclp)
1923 {
1924 zfs_acl_t *aclp;
1925 zfs_acl_node_t *aclnode;
1926 int aclcnt = vsecp->vsa_aclcnt;
1927 int error;
1928
1929 if (vsecp->vsa_aclcnt > MAX_ACL_ENTRIES || vsecp->vsa_aclcnt <= 0)
1930 return (EINVAL);
1931
1932 aclp = zfs_acl_alloc(zfs_acl_version(zfsvfs->z_version));
1933
1934 aclp->z_hints = 0;
1935 aclnode = zfs_acl_node_alloc(aclcnt * sizeof (zfs_object_ace_t));
1936 if (aclp->z_version == ZFS_ACL_VERSION_INITIAL) {
1937 if ((error = zfs_copy_ace_2_oldace(obj_type, aclp,
1938 (ace_t *)vsecp->vsa_aclentp, aclnode->z_acldata,
1939 aclcnt, &aclnode->z_size)) != 0) {
1940 zfs_acl_free(aclp);
1941 zfs_acl_node_free(aclnode);
1942 return (error);
1943 }
1944 } else {
1945 if ((error = zfs_copy_ace_2_fuid(zfsvfs, obj_type, aclp,
1946 vsecp->vsa_aclentp, aclnode->z_acldata, aclcnt,
1947 &aclnode->z_size, fuidp, cr)) != 0) {
1948 zfs_acl_free(aclp);
1949 zfs_acl_node_free(aclnode);
1950 return (error);
1951 }
1952 }
1953 aclp->z_acl_bytes = aclnode->z_size;
1954 aclnode->z_ace_count = aclcnt;
1955 aclp->z_acl_count = aclcnt;
1956 list_insert_head(&aclp->z_acl, aclnode);
1957
1958 /*
1959 * If flags are being set then add them to z_hints
1960 */
1961 if (vsecp->vsa_mask & VSA_ACE_ACLFLAGS) {
1962 if (vsecp->vsa_aclflags & ACL_PROTECTED)
1963 aclp->z_hints |= ZFS_ACL_PROTECTED;
1964 if (vsecp->vsa_aclflags & ACL_DEFAULTED)
1965 aclp->z_hints |= ZFS_ACL_DEFAULTED;
1966 if (vsecp->vsa_aclflags & ACL_AUTO_INHERIT)
1967 aclp->z_hints |= ZFS_ACL_AUTO_INHERIT;
1968 }
1969
1970 *zaclp = aclp;
1971
1972 return (0);
1973 }
1974
1975 /*
1976 * Set a files ACL
1977 */
1978 int
1979 zfs_setacl(znode_t *zp, vsecattr_t *vsecp, boolean_t skipaclchk, cred_t *cr)
1980 {
1981 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
1982 zilog_t *zilog = zfsvfs->z_log;
1983 ulong_t mask = vsecp->vsa_mask & (VSA_ACE | VSA_ACECNT);
1984 dmu_tx_t *tx;
1985 int error;
1986 zfs_acl_t *aclp;
1987 zfs_fuid_info_t *fuidp = NULL;
1988 boolean_t fuid_dirtied;
1989 uint64_t acl_obj;
1990
1991 if (mask == 0)
1992 return (ENOSYS);
1993
1994 if (zp->z_pflags & ZFS_IMMUTABLE)
1995 return (EPERM);
1996
1997 if (error = zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr))
1998 return (error);
1999
2000 error = zfs_vsec_2_aclp(zfsvfs, ZTOV(zp)->v_type, vsecp, cr, &fuidp,
2001 &aclp);
2002 if (error)
2003 return (error);
2004
2005 /*
2006 * If ACL wide flags aren't being set then preserve any
2007 * existing flags.
2008 */
2009 if (!(vsecp->vsa_mask & VSA_ACE_ACLFLAGS)) {
2010 aclp->z_hints |=
2011 (zp->z_pflags & V4_ACL_WIDE_FLAGS);
2012 }
2013 top:
2014 mutex_enter(&zp->z_acl_lock);
2015 mutex_enter(&zp->z_lock);
2016
2017 tx = dmu_tx_create(zfsvfs->z_os);
2018
2019 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
2020
2021 fuid_dirtied = zfsvfs->z_fuid_dirty;
2022 if (fuid_dirtied)
2023 zfs_fuid_txhold(zfsvfs, tx);
2024
2025 /*
2026 * If old version and ACL won't fit in bonus and we aren't
2027 * upgrading then take out necessary DMU holds
2028 */
2029
2030 if ((acl_obj = zfs_external_acl(zp)) != 0) {
2031 if (zfsvfs->z_version >= ZPL_VERSION_FUID &&
2032 zfs_znode_acl_version(zp) <= ZFS_ACL_VERSION_INITIAL) {
2033 dmu_tx_hold_free(tx, acl_obj, 0,
2034 DMU_OBJECT_END);
2035 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0,
2036 aclp->z_acl_bytes);
2037 } else {
2038 dmu_tx_hold_write(tx, acl_obj, 0, aclp->z_acl_bytes);
2039 }
2040 } else if (!zp->z_is_sa && aclp->z_acl_bytes > ZFS_ACE_SPACE) {
2041 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, aclp->z_acl_bytes);
2042 }
2043
2044 zfs_sa_upgrade_txholds(tx, zp);
2045 error = dmu_tx_assign(tx, TXG_NOWAIT);
2046 if (error) {
2047 mutex_exit(&zp->z_acl_lock);
2048 mutex_exit(&zp->z_lock);
2049
2050 if (error == ERESTART) {
2051 dmu_tx_wait(tx);
2052 dmu_tx_abort(tx);
2053 goto top;
2054 }
2055 dmu_tx_abort(tx);
2056 zfs_acl_free(aclp);
2057 return (error);
2058 }
2059
2060 error = zfs_aclset_common(zp, aclp, cr, tx);
2061 ASSERT(error == 0);
2062 ASSERT(zp->z_acl_cached == NULL);
2063 zp->z_acl_cached = aclp;
2064
2065 if (fuid_dirtied)
2066 zfs_fuid_sync(zfsvfs, tx);
2067
2068 zfs_log_acl(zilog, tx, zp, vsecp, fuidp);
2069
2070 if (fuidp)
2071 zfs_fuid_info_free(fuidp);
2072 dmu_tx_commit(tx);
2073 done:
2074 mutex_exit(&zp->z_lock);
2075 mutex_exit(&zp->z_acl_lock);
2076
2077 return (error);
2078 }
2079
2080 /*
2081 * Check accesses of interest (AoI) against attributes of the dataset
2082 * such as read-only. Returns zero if no AoI conflict with dataset
2083 * attributes, otherwise an appropriate errno is returned.
2084 */
2085 static int
2086 zfs_zaccess_dataset_check(znode_t *zp, uint32_t v4_mode)
2087 {
2088 if ((v4_mode & WRITE_MASK) &&
2089 (zp->z_zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) &&
2090 (!IS_DEVVP(ZTOV(zp)) ||
2091 (IS_DEVVP(ZTOV(zp)) && (v4_mode & WRITE_MASK_ATTRS)))) {
2092 return (EROFS);
2093 }
2094
2095 /*
2096 * Only check for READONLY on non-directories.
2097 */
2098 if ((v4_mode & WRITE_MASK_DATA) &&
2099 (((ZTOV(zp)->v_type != VDIR) &&
2100 (zp->z_pflags & (ZFS_READONLY | ZFS_IMMUTABLE))) ||
2101 (ZTOV(zp)->v_type == VDIR &&
2102 (zp->z_pflags & ZFS_IMMUTABLE)))) {
2103 return (EPERM);
2104 }
2105
2106 if ((v4_mode & (ACE_DELETE | ACE_DELETE_CHILD)) &&
2107 (zp->z_pflags & ZFS_NOUNLINK)) {
2108 return (EPERM);
2109 }
2110
2111 if (((v4_mode & (ACE_READ_DATA|ACE_EXECUTE)) &&
2112 (zp->z_pflags & ZFS_AV_QUARANTINED))) {
2113 return (EACCES);
2114 }
2115
2116 return (0);
2117 }
2118
2119 /*
2120 * The primary usage of this function is to loop through all of the
2121 * ACEs in the znode, determining what accesses of interest (AoI) to
2122 * the caller are allowed or denied. The AoI are expressed as bits in
2123 * the working_mode parameter. As each ACE is processed, bits covered
2124 * by that ACE are removed from the working_mode. This removal
2125 * facilitates two things. The first is that when the working mode is
2126 * empty (= 0), we know we've looked at all the AoI. The second is
2127 * that the ACE interpretation rules don't allow a later ACE to undo
2128 * something granted or denied by an earlier ACE. Removing the
2129 * discovered access or denial enforces this rule. At the end of
2130 * processing the ACEs, all AoI that were found to be denied are
2131 * placed into the working_mode, giving the caller a mask of denied
2132 * accesses. Returns:
2133 * 0 if all AoI granted
2134 * EACCESS if the denied mask is non-zero
2135 * other error if abnormal failure (e.g., IO error)
2136 *
2137 * A secondary usage of the function is to determine if any of the
2138 * AoI are granted. If an ACE grants any access in
2139 * the working_mode, we immediately short circuit out of the function.
2140 * This mode is chosen by setting anyaccess to B_TRUE. The
2141 * working_mode is not a denied access mask upon exit if the function
2142 * is used in this manner.
2143 */
2144 static int
2145 zfs_zaccess_aces_check(znode_t *zp, uint32_t *working_mode,
2146 boolean_t anyaccess, cred_t *cr)
2147 {
2148 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
2149 zfs_acl_t *aclp;
2150 int error;
2151 uid_t uid = crgetuid(cr);
2152 uint64_t who;
2153 uint16_t type, iflags;
2154 uint16_t entry_type;
2155 uint32_t access_mask;
2156 uint32_t deny_mask = 0;
2157 zfs_ace_hdr_t *acep = NULL;
2158 boolean_t checkit;
2159 uid_t gowner;
2160 uid_t fowner;
2161
2162 zfs_fuid_map_ids(zp, cr, &fowner, &gowner);
2163
2164 mutex_enter(&zp->z_acl_lock);
2165
2166 error = zfs_acl_node_read(zp, B_FALSE, &aclp, B_FALSE);
2167 if (error != 0) {
2168 mutex_exit(&zp->z_acl_lock);
2169 return (error);
2170 }
2171
2172 ASSERT(zp->z_acl_cached);
2173
2174 while (acep = zfs_acl_next_ace(aclp, acep, &who, &access_mask,
2175 &iflags, &type)) {
2176 uint32_t mask_matched;
2177
2178 if (!zfs_acl_valid_ace_type(type, iflags))
2179 continue;
2180
2181 if (ZTOV(zp)->v_type == VDIR && (iflags & ACE_INHERIT_ONLY_ACE))
2182 continue;
2183
2184 /* Skip ACE if it does not affect any AoI */
2185 mask_matched = (access_mask & *working_mode);
2186 if (!mask_matched)
2187 continue;
2188
2189 entry_type = (iflags & ACE_TYPE_FLAGS);
2190
2191 checkit = B_FALSE;
2192
2193 switch (entry_type) {
2194 case ACE_OWNER:
2195 if (uid == fowner)
2196 checkit = B_TRUE;
2197 break;
2198 case OWNING_GROUP:
2199 who = gowner;
2200 /*FALLTHROUGH*/
2201 case ACE_IDENTIFIER_GROUP:
2202 checkit = zfs_groupmember(zfsvfs, who, cr);
2203 break;
2204 case ACE_EVERYONE:
2205 checkit = B_TRUE;
2206 break;
2207
2208 /* USER Entry */
2209 default:
2210 if (entry_type == 0) {
2211 uid_t newid;
2212
2213 newid = zfs_fuid_map_id(zfsvfs, who, cr,
2214 ZFS_ACE_USER);
2215 if (newid != IDMAP_WK_CREATOR_OWNER_UID &&
2216 uid == newid)
2217 checkit = B_TRUE;
2218 break;
2219 } else {
2220 mutex_exit(&zp->z_acl_lock);
2221 return (EIO);
2222 }
2223 }
2224
2225 if (checkit) {
2226 if (type == DENY) {
2227 DTRACE_PROBE3(zfs__ace__denies,
2228 znode_t *, zp,
2229 zfs_ace_hdr_t *, acep,
2230 uint32_t, mask_matched);
2231 deny_mask |= mask_matched;
2232 } else {
2233 DTRACE_PROBE3(zfs__ace__allows,
2234 znode_t *, zp,
2235 zfs_ace_hdr_t *, acep,
2236 uint32_t, mask_matched);
2237 if (anyaccess) {
2238 mutex_exit(&zp->z_acl_lock);
2239 return (0);
2240 }
2241 }
2242 *working_mode &= ~mask_matched;
2243 }
2244
2245 /* Are we done? */
2246 if (*working_mode == 0)
2247 break;
2248 }
2249
2250 mutex_exit(&zp->z_acl_lock);
2251
2252 /* Put the found 'denies' back on the working mode */
2253 if (deny_mask) {
2254 *working_mode |= deny_mask;
2255 return (EACCES);
2256 } else if (*working_mode) {
2257 return (-1);
2258 }
2259
2260 return (0);
2261 }
2262
2263 /*
2264 * Return true if any access whatsoever granted, we don't actually
2265 * care what access is granted.
2266 */
2267 boolean_t
2268 zfs_has_access(znode_t *zp, cred_t *cr)
2269 {
2270 uint32_t have = ACE_ALL_PERMS;
2271
2272 if (zfs_zaccess_aces_check(zp, &have, B_TRUE, cr) != 0) {
2273 uid_t owner;
2274
2275 owner = zfs_fuid_map_id(zp->z_zfsvfs, zp->z_uid, cr, ZFS_OWNER);
2276 return (secpolicy_vnode_any_access(cr, ZTOV(zp), owner) == 0);
2277 }
2278 return (B_TRUE);
2279 }
2280
2281 static int
2282 zfs_zaccess_common(znode_t *zp, uint32_t v4_mode, uint32_t *working_mode,
2283 boolean_t *check_privs, boolean_t skipaclchk, cred_t *cr)
2284 {
2285 zfsvfs_t *zfsvfs = zp->z_zfsvfs;
2286 int err;
2287
2288 *working_mode = v4_mode;
2289 *check_privs = B_TRUE;
2290
2291 /*
2292 * Short circuit empty requests
2293 */
2294 if (v4_mode == 0 || zfsvfs->z_replay) {
2295 *working_mode = 0;
2296 return (0);
2297 }
2298
2299 if ((err = zfs_zaccess_dataset_check(zp, v4_mode)) != 0) {
2300 *check_privs = B_FALSE;
2301 return (err);
2302 }
2303
2304 /*
2305 * The caller requested that the ACL check be skipped. This
2306 * would only happen if the caller checked VOP_ACCESS() with a
2307 * 32 bit ACE mask and already had the appropriate permissions.
2308 */
2309 if (skipaclchk) {
2310 *working_mode = 0;
2311 return (0);
2312 }
2313
2314 return (zfs_zaccess_aces_check(zp, working_mode, B_FALSE, cr));
2315 }
2316
2317 static int
2318 zfs_zaccess_append(znode_t *zp, uint32_t *working_mode, boolean_t *check_privs,
2319 cred_t *cr)
2320 {
2321 if (*working_mode != ACE_WRITE_DATA)
2322 return (EACCES);
2323
2324 return (zfs_zaccess_common(zp, ACE_APPEND_DATA, working_mode,
2325 check_privs, B_FALSE, cr));
2326 }
2327
2328 int
2329 zfs_fastaccesschk_execute(znode_t *zdp, cred_t *cr)
2330 {
2331 boolean_t owner = B_FALSE;
2332 boolean_t groupmbr = B_FALSE;
2333 boolean_t is_attr;
2334 uid_t uid = crgetuid(cr);
2335 int error;
2336
2337 if (zdp->z_pflags & ZFS_AV_QUARANTINED)
2338 return (EACCES);
2339
2340 is_attr = ((zdp->z_pflags & ZFS_XATTR) &&
2341 (ZTOV(zdp)->v_type == VDIR));
2342 if (is_attr)
2343 goto slow;
2344
2345
2346 mutex_enter(&zdp->z_acl_lock);
2347
2348 if (zdp->z_pflags & ZFS_NO_EXECS_DENIED) {
2349 mutex_exit(&zdp->z_acl_lock);
2350 return (0);
2351 }
2352
2353 if (FUID_INDEX(zdp->z_uid) != 0 || FUID_INDEX(zdp->z_gid) != 0) {
2354 mutex_exit(&zdp->z_acl_lock);
2355 goto slow;
2356 }
2357
2358 if (uid == zdp->z_uid) {
2359 owner = B_TRUE;
2360 if (zdp->z_mode & S_IXUSR) {
2361 mutex_exit(&zdp->z_acl_lock);
2362 return (0);
2363 } else {
2364 mutex_exit(&zdp->z_acl_lock);
2365 goto slow;
2366 }
2367 }
2368 if (groupmember(zdp->z_gid, cr)) {
2369 groupmbr = B_TRUE;
2370 if (zdp->z_mode & S_IXGRP) {
2371 mutex_exit(&zdp->z_acl_lock);
2372 return (0);
2373 } else {
2374 mutex_exit(&zdp->z_acl_lock);
2375 goto slow;
2376 }
2377 }
2378 if (!owner && !groupmbr) {
2379 if (zdp->z_mode & S_IXOTH) {
2380 mutex_exit(&zdp->z_acl_lock);
2381 return (0);
2382 }
2383 }
2384
2385 mutex_exit(&zdp->z_acl_lock);
2386
2387 slow:
2388 DTRACE_PROBE(zfs__fastpath__execute__access__miss);
2389 ZFS_ENTER(zdp->z_zfsvfs);
2390 error = zfs_zaccess(zdp, ACE_EXECUTE, 0, B_FALSE, cr);
2391 ZFS_EXIT(zdp->z_zfsvfs);
2392 return (error);
2393 }
2394
2395 /*
2396 * Determine whether Access should be granted/denied.
2397 * The least priv subsytem is always consulted as a basic privilege
2398 * can define any form of access.
2399 */
2400 int
2401 zfs_zaccess(znode_t *zp, int mode, int flags, boolean_t skipaclchk, cred_t *cr)
2402 {
2403 uint32_t working_mode;
2404 int error;
2405 int is_attr;
2406 boolean_t check_privs;
2407 znode_t *xzp;
2408 znode_t *check_zp = zp;
2409 mode_t needed_bits;
2410 uid_t owner;
2411
2412 is_attr = ((zp->z_pflags & ZFS_XATTR) && (ZTOV(zp)->v_type == VDIR));
2413
2414 /*
2415 * If attribute then validate against base file
2416 */
2417 if (is_attr) {
2418 uint64_t parent;
2419
2420 if ((error = sa_lookup(zp->z_sa_hdl,
2421 SA_ZPL_PARENT(zp->z_zfsvfs), &parent,
2422 sizeof (parent))) != 0)
2423 return (error);
2424
2425 if ((error = zfs_zget(zp->z_zfsvfs,
2426 parent, &xzp)) != 0) {
2427 return (error);
2428 }
2429
2430 check_zp = xzp;
2431
2432 /*
2433 * fixup mode to map to xattr perms
2434 */
2435
2436 if (mode & (ACE_WRITE_DATA|ACE_APPEND_DATA)) {
2437 mode &= ~(ACE_WRITE_DATA|ACE_APPEND_DATA);
2438 mode |= ACE_WRITE_NAMED_ATTRS;
2439 }
2440
2441 if (mode & (ACE_READ_DATA|ACE_EXECUTE)) {
2442 mode &= ~(ACE_READ_DATA|ACE_EXECUTE);
2443 mode |= ACE_READ_NAMED_ATTRS;
2444 }
2445 }
2446
2447 owner = zfs_fuid_map_id(zp->z_zfsvfs, zp->z_uid, cr, ZFS_OWNER);
2448 /*
2449 * Map the bits required to the standard vnode flags VREAD|VWRITE|VEXEC
2450 * in needed_bits. Map the bits mapped by working_mode (currently
2451 * missing) in missing_bits.
2452 * Call secpolicy_vnode_access2() with (needed_bits & ~checkmode),
2453 * needed_bits.
2454 */
2455 needed_bits = 0;
2456
2457 working_mode = mode;
2458 if ((working_mode & (ACE_READ_ACL|ACE_READ_ATTRIBUTES)) &&
2459 owner == crgetuid(cr))
2460 working_mode &= ~(ACE_READ_ACL|ACE_READ_ATTRIBUTES);
2461
2462 if (working_mode & (ACE_READ_DATA|ACE_READ_NAMED_ATTRS|
2463 ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_SYNCHRONIZE))
2464 needed_bits |= VREAD;
2465 if (working_mode & (ACE_WRITE_DATA|ACE_WRITE_NAMED_ATTRS|
2466 ACE_APPEND_DATA|ACE_WRITE_ATTRIBUTES|ACE_SYNCHRONIZE))
2467 needed_bits |= VWRITE;
2468 if (working_mode & ACE_EXECUTE)
2469 needed_bits |= VEXEC;
2470
2471 if ((error = zfs_zaccess_common(check_zp, mode, &working_mode,
2472 &check_privs, skipaclchk, cr)) == 0) {
2473 if (is_attr)
2474 VN_RELE(ZTOV(xzp));
2475 return (secpolicy_vnode_access2(cr, ZTOV(zp), owner,
2476 needed_bits, needed_bits));
2477 }
2478
2479 if (error && !check_privs) {
2480 if (is_attr)
2481 VN_RELE(ZTOV(xzp));
2482 return (error);
2483 }
2484
2485 if (error && (flags & V_APPEND)) {
2486 error = zfs_zaccess_append(zp, &working_mode, &check_privs, cr);
2487 }
2488
2489 if (error && check_privs) {
2490 mode_t checkmode = 0;
2491
2492 /*
2493 * First check for implicit owner permission on
2494 * read_acl/read_attributes
2495 */
2496
2497 error = 0;
2498 ASSERT(working_mode != 0);
2499
2500 if ((working_mode & (ACE_READ_ACL|ACE_READ_ATTRIBUTES) &&
2501 owner == crgetuid(cr)))
2502 working_mode &= ~(ACE_READ_ACL|ACE_READ_ATTRIBUTES);
2503
2504 if (working_mode & (ACE_READ_DATA|ACE_READ_NAMED_ATTRS|
2505 ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_SYNCHRONIZE))
2506 checkmode |= VREAD;
2507 if (working_mode & (ACE_WRITE_DATA|ACE_WRITE_NAMED_ATTRS|
2508 ACE_APPEND_DATA|ACE_WRITE_ATTRIBUTES|ACE_SYNCHRONIZE))
2509 checkmode |= VWRITE;
2510 if (working_mode & ACE_EXECUTE)
2511 checkmode |= VEXEC;
2512
2513 error = secpolicy_vnode_access2(cr, ZTOV(check_zp), owner,
2514 needed_bits & ~checkmode, needed_bits);
2515
2516 if (error == 0 && (working_mode & ACE_WRITE_OWNER))
2517 error = secpolicy_vnode_chown(cr, owner);
2518 if (error == 0 && (working_mode & ACE_WRITE_ACL))
2519 error = secpolicy_vnode_setdac(cr, owner);
2520
2521 if (error == 0 && (working_mode &
2522 (ACE_DELETE|ACE_DELETE_CHILD)))
2523 error = secpolicy_vnode_remove(cr);
2524
2525 if (error == 0 && (working_mode & ACE_SYNCHRONIZE)) {
2526 error = secpolicy_vnode_chown(cr, owner);
2527 }
2528 if (error == 0) {
2529 /*
2530 * See if any bits other than those already checked
2531 * for are still present. If so then return EACCES
2532 */
2533 if (working_mode & ~(ZFS_CHECKED_MASKS)) {
2534 error = EACCES;
2535 }
2536 }
2537 } else if (error == 0) {
2538 error = secpolicy_vnode_access2(cr, ZTOV(zp), owner,
2539 needed_bits, needed_bits);
2540 }
2541
2542
2543 if (is_attr)
2544 VN_RELE(ZTOV(xzp));
2545
2546 return (error);
2547 }
2548
2549 /*
2550 * Translate traditional unix VREAD/VWRITE/VEXEC mode into
2551 * native ACL format and call zfs_zaccess()
2552 */
2553 int
2554 zfs_zaccess_rwx(znode_t *zp, mode_t mode, int flags, cred_t *cr)
2555 {
2556 return (zfs_zaccess(zp, zfs_unix_to_v4(mode >> 6), flags, B_FALSE, cr));
2557 }
2558
2559 /*
2560 * Access function for secpolicy_vnode_setattr
2561 */
2562 int
2563 zfs_zaccess_unix(znode_t *zp, mode_t mode, cred_t *cr)
2564 {
2565 int v4_mode = zfs_unix_to_v4(mode >> 6);
2566
2567 return (zfs_zaccess(zp, v4_mode, 0, B_FALSE, cr));
2568 }
2569
2570 static int
2571 zfs_delete_final_check(znode_t *zp, znode_t *dzp,
2572 mode_t available_perms, cred_t *cr)
2573 {
2574 int error;
2575 uid_t downer;
2576
2577 downer = zfs_fuid_map_id(dzp->z_zfsvfs, dzp->z_uid, cr, ZFS_OWNER);
2578
2579 error = secpolicy_vnode_access2(cr, ZTOV(dzp),
2580 downer, available_perms, VWRITE|VEXEC);
2581
2582 if (error == 0)
2583 error = zfs_sticky_remove_access(dzp, zp, cr);
2584
2585 return (error);
2586 }
2587
2588 /*
2589 * Determine whether Access should be granted/deny, without
2590 * consulting least priv subsystem.
2591 *
2592 *
2593 * The following chart is the recommended NFSv4 enforcement for
2594 * ability to delete an object.
2595 *
2596 * -------------------------------------------------------
2597 * | Parent Dir | Target Object Permissions |
2598 * | permissions | |
2599 * -------------------------------------------------------
2600 * | | ACL Allows | ACL Denies| Delete |
2601 * | | Delete | Delete | unspecified|
2602 * -------------------------------------------------------
2603 * | ACL Allows | Permit | Permit | Permit |
2604 * | DELETE_CHILD | |
2605 * -------------------------------------------------------
2606 * | ACL Denies | Permit | Deny | Deny |
2607 * | DELETE_CHILD | | | |
2608 * -------------------------------------------------------
2609 * | ACL specifies | | | |
2610 * | only allow | Permit | Permit | Permit |
2611 * | write and | | | |
2612 * | execute | | | |
2613 * -------------------------------------------------------
2614 * | ACL denies | | | |
2615 * | write and | Permit | Deny | Deny |
2616 * | execute | | | |
2617 * -------------------------------------------------------
2618 * ^
2619 * |
2620 * No search privilege, can't even look up file?
2621 *
2622 */
2623 int
2624 zfs_zaccess_delete(znode_t *dzp, znode_t *zp, cred_t *cr)
2625 {
2626 uint32_t dzp_working_mode = 0;
2627 uint32_t zp_working_mode = 0;
2628 int dzp_error, zp_error;
2629 mode_t available_perms;
2630 boolean_t dzpcheck_privs = B_TRUE;
2631 boolean_t zpcheck_privs = B_TRUE;
2632
2633 /*
2634 * We want specific DELETE permissions to
2635 * take precedence over WRITE/EXECUTE. We don't
2636 * want an ACL such as this to mess us up.
2637 * user:joe:write_data:deny,user:joe:delete:allow
2638 *
2639 * However, deny permissions may ultimately be overridden
2640 * by secpolicy_vnode_access().
2641 *
2642 * We will ask for all of the necessary permissions and then
2643 * look at the working modes from the directory and target object
2644 * to determine what was found.
2645 */
2646
2647 if (zp->z_pflags & (ZFS_IMMUTABLE | ZFS_NOUNLINK))
2648 return (EPERM);
2649
2650 /*
2651 * First row
2652 * If the directory permissions allow the delete, we are done.
2653 */
2654 if ((dzp_error = zfs_zaccess_common(dzp, ACE_DELETE_CHILD,
2655 &dzp_working_mode, &dzpcheck_privs, B_FALSE, cr)) == 0)
2656 return (0);
2657
2658 /*
2659 * If target object has delete permission then we are done
2660 */
2661 if ((zp_error = zfs_zaccess_common(zp, ACE_DELETE, &zp_working_mode,
2662 &zpcheck_privs, B_FALSE, cr)) == 0)
2663 return (0);
2664
2665 ASSERT(dzp_error && zp_error);
2666
2667 if (!dzpcheck_privs)
2668 return (dzp_error);
2669 if (!zpcheck_privs)
2670 return (zp_error);
2671
2672 /*
2673 * Second row
2674 *
2675 * If directory returns EACCES then delete_child was denied
2676 * due to deny delete_child. In this case send the request through
2677 * secpolicy_vnode_remove(). We don't use zfs_delete_final_check()
2678 * since that *could* allow the delete based on write/execute permission
2679 * and we want delete permissions to override write/execute.
2680 */
2681
2682 if (dzp_error == EACCES)
2683 return (secpolicy_vnode_remove(cr));
2684
2685 /*
2686 * Third Row
2687 * only need to see if we have write/execute on directory.
2688 */
2689
2690 dzp_error = zfs_zaccess_common(dzp, ACE_EXECUTE|ACE_WRITE_DATA,
2691 &dzp_working_mode, &dzpcheck_privs, B_FALSE, cr);
2692
2693 if (dzp_error != 0 && !dzpcheck_privs)
2694 return (dzp_error);
2695
2696 /*
2697 * Fourth row
2698 */
2699
2700 available_perms = (dzp_working_mode & ACE_WRITE_DATA) ? 0 : VWRITE;
2701 available_perms |= (dzp_working_mode & ACE_EXECUTE) ? 0 : VEXEC;
2702
2703 return (zfs_delete_final_check(zp, dzp, available_perms, cr));
2704
2705 }
2706
2707 int
2708 zfs_zaccess_rename(znode_t *sdzp, znode_t *szp, znode_t *tdzp,
2709 znode_t *tzp, cred_t *cr)
2710 {
2711 int add_perm;
2712 int error;
2713
2714 if (szp->z_pflags & ZFS_AV_QUARANTINED)
2715 return (EACCES);
2716
2717 add_perm = (ZTOV(szp)->v_type == VDIR) ?
2718 ACE_ADD_SUBDIRECTORY : ACE_ADD_FILE;
2719
2720 /*
2721 * Rename permissions are combination of delete permission +
2722 * add file/subdir permission.
2723 */
2724
2725 /*
2726 * first make sure we do the delete portion.
2727 *
2728 * If that succeeds then check for add_file/add_subdir permissions
2729 */
2730
2731 if (error = zfs_zaccess_delete(sdzp, szp, cr))
2732 return (error);
2733
2734 /*
2735 * If we have a tzp, see if we can delete it?
2736 */
2737 if (tzp) {
2738 if (error = zfs_zaccess_delete(tdzp, tzp, cr))
2739 return (error);
2740 }
2741
2742 /*
2743 * Now check for add permissions
2744 */
2745 error = zfs_zaccess(tdzp, add_perm, 0, B_FALSE, cr);
2746
2747 return (error);
2748 }
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