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