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[mirror_zfs.git] / module / zfs / zfs_acl.c
1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2013 by Delphix. All rights reserved.
24 */
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
57 #define ALLOW ACE_ACCESS_ALLOWED_ACE_TYPE
58 #define DENY ACE_ACCESS_DENIED_ACE_TYPE
59 #define MAX_ACE_TYPE ACE_SYSTEM_ALARM_CALLBACK_OBJECT_ACE_TYPE
60 #define MIN_ACE_TYPE ALLOW
61
62 #define OWNING_GROUP (ACE_GROUP|ACE_IDENTIFIER_GROUP)
63 #define EVERYONE_ALLOW_MASK (ACE_READ_ACL|ACE_READ_ATTRIBUTES | \
64 ACE_READ_NAMED_ATTRS|ACE_SYNCHRONIZE)
65 #define EVERYONE_DENY_MASK (ACE_WRITE_ACL|ACE_WRITE_OWNER | \
66 ACE_WRITE_ATTRIBUTES|ACE_WRITE_NAMED_ATTRS)
67 #define OWNER_ALLOW_MASK (ACE_WRITE_ACL | ACE_WRITE_OWNER | \
68 ACE_WRITE_ATTRIBUTES|ACE_WRITE_NAMED_ATTRS)
69
70 #define ZFS_CHECKED_MASKS (ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_READ_DATA| \
71 ACE_READ_NAMED_ATTRS|ACE_WRITE_DATA|ACE_WRITE_ATTRIBUTES| \
72 ACE_WRITE_NAMED_ATTRS|ACE_APPEND_DATA|ACE_EXECUTE|ACE_WRITE_OWNER| \
73 ACE_WRITE_ACL|ACE_DELETE|ACE_DELETE_CHILD|ACE_SYNCHRONIZE)
74
75 #define WRITE_MASK_DATA (ACE_WRITE_DATA|ACE_APPEND_DATA|ACE_WRITE_NAMED_ATTRS)
76 #define WRITE_MASK_ATTRS (ACE_WRITE_ACL|ACE_WRITE_OWNER|ACE_WRITE_ATTRIBUTES| \
77 ACE_DELETE|ACE_DELETE_CHILD)
78 #define WRITE_MASK (WRITE_MASK_DATA|WRITE_MASK_ATTRS)
79
80 #define OGE_CLEAR (ACE_READ_DATA|ACE_LIST_DIRECTORY|ACE_WRITE_DATA| \
81 ACE_ADD_FILE|ACE_APPEND_DATA|ACE_ADD_SUBDIRECTORY|ACE_EXECUTE)
82
83 #define OKAY_MASK_BITS (ACE_READ_DATA|ACE_LIST_DIRECTORY|ACE_WRITE_DATA| \
84 ACE_ADD_FILE|ACE_APPEND_DATA|ACE_ADD_SUBDIRECTORY|ACE_EXECUTE)
85
86 #define ALL_INHERIT (ACE_FILE_INHERIT_ACE|ACE_DIRECTORY_INHERIT_ACE | \
87 ACE_NO_PROPAGATE_INHERIT_ACE|ACE_INHERIT_ONLY_ACE|ACE_INHERITED_ACE)
88
89 #define RESTRICTED_CLEAR (ACE_WRITE_ACL|ACE_WRITE_OWNER)
90
91 #define V4_ACL_WIDE_FLAGS (ZFS_ACL_AUTO_INHERIT|ZFS_ACL_DEFAULTED|\
92 ZFS_ACL_PROTECTED)
93
94 #define ZFS_ACL_WIDE_FLAGS (V4_ACL_WIDE_FLAGS|ZFS_ACL_TRIVIAL|ZFS_INHERIT_ACE|\
95 ZFS_ACL_OBJ_ACE)
96
97 #define ALL_MODE_EXECS (S_IXUSR | S_IXGRP | S_IXOTH)
98
99 static uint16_t
100 zfs_ace_v0_get_type(void *acep)
101 {
102 return (((zfs_oldace_t *)acep)->z_type);
103 }
104
105 static uint16_t
106 zfs_ace_v0_get_flags(void *acep)
107 {
108 return (((zfs_oldace_t *)acep)->z_flags);
109 }
110
111 static uint32_t
112 zfs_ace_v0_get_mask(void *acep)
113 {
114 return (((zfs_oldace_t *)acep)->z_access_mask);
115 }
116
117 static uint64_t
118 zfs_ace_v0_get_who(void *acep)
119 {
120 return (((zfs_oldace_t *)acep)->z_fuid);
121 }
122
123 static void
124 zfs_ace_v0_set_type(void *acep, uint16_t type)
125 {
126 ((zfs_oldace_t *)acep)->z_type = type;
127 }
128
129 static void
130 zfs_ace_v0_set_flags(void *acep, uint16_t flags)
131 {
132 ((zfs_oldace_t *)acep)->z_flags = flags;
133 }
134
135 static void
136 zfs_ace_v0_set_mask(void *acep, uint32_t mask)
137 {
138 ((zfs_oldace_t *)acep)->z_access_mask = mask;
139 }
140
141 static void
142 zfs_ace_v0_set_who(void *acep, uint64_t who)
143 {
144 ((zfs_oldace_t *)acep)->z_fuid = who;
145 }
146
147 /*ARGSUSED*/
148 static size_t
149 zfs_ace_v0_size(void *acep)
150 {
151 return (sizeof (zfs_oldace_t));
152 }
153
154 static size_t
155 zfs_ace_v0_abstract_size(void)
156 {
157 return (sizeof (zfs_oldace_t));
158 }
159
160 static int
161 zfs_ace_v0_mask_off(void)
162 {
163 return (offsetof(zfs_oldace_t, z_access_mask));
164 }
165
166 /*ARGSUSED*/
167 static int
168 zfs_ace_v0_data(void *acep, void **datap)
169 {
170 *datap = NULL;
171 return (0);
172 }
173
174 static acl_ops_t zfs_acl_v0_ops = {
175 zfs_ace_v0_get_mask,
176 zfs_ace_v0_set_mask,
177 zfs_ace_v0_get_flags,
178 zfs_ace_v0_set_flags,
179 zfs_ace_v0_get_type,
180 zfs_ace_v0_set_type,
181 zfs_ace_v0_get_who,
182 zfs_ace_v0_set_who,
183 zfs_ace_v0_size,
184 zfs_ace_v0_abstract_size,
185 zfs_ace_v0_mask_off,
186 zfs_ace_v0_data
187 };
188
189 static uint16_t
190 zfs_ace_fuid_get_type(void *acep)
191 {
192 return (((zfs_ace_hdr_t *)acep)->z_type);
193 }
194
195 static uint16_t
196 zfs_ace_fuid_get_flags(void *acep)
197 {
198 return (((zfs_ace_hdr_t *)acep)->z_flags);
199 }
200
201 static uint32_t
202 zfs_ace_fuid_get_mask(void *acep)
203 {
204 return (((zfs_ace_hdr_t *)acep)->z_access_mask);
205 }
206
207 static uint64_t
208 zfs_ace_fuid_get_who(void *args)
209 {
210 uint16_t entry_type;
211 zfs_ace_t *acep = args;
212
213 entry_type = acep->z_hdr.z_flags & ACE_TYPE_FLAGS;
214
215 if (entry_type == ACE_OWNER || entry_type == OWNING_GROUP ||
216 entry_type == ACE_EVERYONE)
217 return (-1);
218 return (((zfs_ace_t *)acep)->z_fuid);
219 }
220
221 static void
222 zfs_ace_fuid_set_type(void *acep, uint16_t type)
223 {
224 ((zfs_ace_hdr_t *)acep)->z_type = type;
225 }
226
227 static void
228 zfs_ace_fuid_set_flags(void *acep, uint16_t flags)
229 {
230 ((zfs_ace_hdr_t *)acep)->z_flags = flags;
231 }
232
233 static void
234 zfs_ace_fuid_set_mask(void *acep, uint32_t mask)
235 {
236 ((zfs_ace_hdr_t *)acep)->z_access_mask = mask;
237 }
238
239 static void
240 zfs_ace_fuid_set_who(void *arg, uint64_t who)
241 {
242 zfs_ace_t *acep = arg;
243
244 uint16_t entry_type = acep->z_hdr.z_flags & ACE_TYPE_FLAGS;
245
246 if (entry_type == ACE_OWNER || entry_type == OWNING_GROUP ||
247 entry_type == ACE_EVERYONE)
248 return;
249 acep->z_fuid = who;
250 }
251
252 static size_t
253 zfs_ace_fuid_size(void *acep)
254 {
255 zfs_ace_hdr_t *zacep = acep;
256 uint16_t entry_type;
257
258 switch (zacep->z_type) {
259 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
260 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
261 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
262 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
263 return (sizeof (zfs_object_ace_t));
264 case ALLOW:
265 case DENY:
266 entry_type =
267 (((zfs_ace_hdr_t *)acep)->z_flags & ACE_TYPE_FLAGS);
268 if (entry_type == ACE_OWNER ||
269 entry_type == OWNING_GROUP ||
270 entry_type == ACE_EVERYONE)
271 return (sizeof (zfs_ace_hdr_t));
272 /*FALLTHROUGH*/
273 default:
274 return (sizeof (zfs_ace_t));
275 }
276 }
277
278 static size_t
279 zfs_ace_fuid_abstract_size(void)
280 {
281 return (sizeof (zfs_ace_hdr_t));
282 }
283
284 static int
285 zfs_ace_fuid_mask_off(void)
286 {
287 return (offsetof(zfs_ace_hdr_t, z_access_mask));
288 }
289
290 static int
291 zfs_ace_fuid_data(void *acep, void **datap)
292 {
293 zfs_ace_t *zacep = acep;
294 zfs_object_ace_t *zobjp;
295
296 switch (zacep->z_hdr.z_type) {
297 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
298 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
299 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
300 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
301 zobjp = acep;
302 *datap = (caddr_t)zobjp + sizeof (zfs_ace_t);
303 return (sizeof (zfs_object_ace_t) - sizeof (zfs_ace_t));
304 default:
305 *datap = NULL;
306 return (0);
307 }
308 }
309
310 static acl_ops_t zfs_acl_fuid_ops = {
311 zfs_ace_fuid_get_mask,
312 zfs_ace_fuid_set_mask,
313 zfs_ace_fuid_get_flags,
314 zfs_ace_fuid_set_flags,
315 zfs_ace_fuid_get_type,
316 zfs_ace_fuid_set_type,
317 zfs_ace_fuid_get_who,
318 zfs_ace_fuid_set_who,
319 zfs_ace_fuid_size,
320 zfs_ace_fuid_abstract_size,
321 zfs_ace_fuid_mask_off,
322 zfs_ace_fuid_data
323 };
324
325 /*
326 * The following three functions are provided for compatibility with
327 * older ZPL version in order to determine if the file use to have
328 * an external ACL and what version of ACL previously existed on the
329 * file. Would really be nice to not need this, sigh.
330 */
331 uint64_t
332 zfs_external_acl(znode_t *zp)
333 {
334 zfs_acl_phys_t acl_phys;
335 int error;
336
337 if (zp->z_is_sa)
338 return (0);
339
340 /*
341 * Need to deal with a potential
342 * race where zfs_sa_upgrade could cause
343 * z_isa_sa to change.
344 *
345 * If the lookup fails then the state of z_is_sa should have
346 * changed.
347 */
348
349 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_ZNODE_ACL(ZTOZSB(zp)),
350 &acl_phys, sizeof (acl_phys))) == 0)
351 return (acl_phys.z_acl_extern_obj);
352 else {
353 /*
354 * after upgrade the SA_ZPL_ZNODE_ACL should have been
355 * removed
356 */
357 VERIFY(zp->z_is_sa && error == ENOENT);
358 return (0);
359 }
360 }
361
362 /*
363 * Determine size of ACL in bytes
364 *
365 * This is more complicated than it should be since we have to deal
366 * with old external ACLs.
367 */
368 static int
369 zfs_acl_znode_info(znode_t *zp, int *aclsize, int *aclcount,
370 zfs_acl_phys_t *aclphys)
371 {
372 zfs_sb_t *zsb = ZTOZSB(zp);
373 uint64_t acl_count;
374 int size;
375 int error;
376
377 ASSERT(MUTEX_HELD(&zp->z_acl_lock));
378 if (zp->z_is_sa) {
379 if ((error = sa_size(zp->z_sa_hdl, SA_ZPL_DACL_ACES(zsb),
380 &size)) != 0)
381 return (error);
382 *aclsize = size;
383 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_DACL_COUNT(zsb),
384 &acl_count, sizeof (acl_count))) != 0)
385 return (error);
386 *aclcount = acl_count;
387 } else {
388 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_ZNODE_ACL(zsb),
389 aclphys, sizeof (*aclphys))) != 0)
390 return (error);
391
392 if (aclphys->z_acl_version == ZFS_ACL_VERSION_INITIAL) {
393 *aclsize = ZFS_ACL_SIZE(aclphys->z_acl_size);
394 *aclcount = aclphys->z_acl_size;
395 } else {
396 *aclsize = aclphys->z_acl_size;
397 *aclcount = aclphys->z_acl_count;
398 }
399 }
400 return (0);
401 }
402
403 int
404 zfs_znode_acl_version(znode_t *zp)
405 {
406 zfs_acl_phys_t acl_phys;
407
408 if (zp->z_is_sa)
409 return (ZFS_ACL_VERSION_FUID);
410 else {
411 int error;
412
413 /*
414 * Need to deal with a potential
415 * race where zfs_sa_upgrade could cause
416 * z_isa_sa to change.
417 *
418 * If the lookup fails then the state of z_is_sa should have
419 * changed.
420 */
421 if ((error = sa_lookup(zp->z_sa_hdl,
422 SA_ZPL_ZNODE_ACL(ZTOZSB(zp)),
423 &acl_phys, sizeof (acl_phys))) == 0)
424 return (acl_phys.z_acl_version);
425 else {
426 /*
427 * After upgrade SA_ZPL_ZNODE_ACL should have
428 * been removed.
429 */
430 VERIFY(zp->z_is_sa && error == ENOENT);
431 return (ZFS_ACL_VERSION_FUID);
432 }
433 }
434 }
435
436 static int
437 zfs_acl_version(int version)
438 {
439 if (version < ZPL_VERSION_FUID)
440 return (ZFS_ACL_VERSION_INITIAL);
441 else
442 return (ZFS_ACL_VERSION_FUID);
443 }
444
445 static int
446 zfs_acl_version_zp(znode_t *zp)
447 {
448 return (zfs_acl_version(ZTOZSB(zp)->z_version));
449 }
450
451 zfs_acl_t *
452 zfs_acl_alloc(int vers)
453 {
454 zfs_acl_t *aclp;
455
456 aclp = kmem_zalloc(sizeof (zfs_acl_t), KM_PUSHPAGE);
457 list_create(&aclp->z_acl, sizeof (zfs_acl_node_t),
458 offsetof(zfs_acl_node_t, z_next));
459 aclp->z_version = vers;
460 if (vers == ZFS_ACL_VERSION_FUID)
461 aclp->z_ops = &zfs_acl_fuid_ops;
462 else
463 aclp->z_ops = &zfs_acl_v0_ops;
464 return (aclp);
465 }
466
467 zfs_acl_node_t *
468 zfs_acl_node_alloc(size_t bytes)
469 {
470 zfs_acl_node_t *aclnode;
471
472 aclnode = kmem_zalloc(sizeof (zfs_acl_node_t), KM_PUSHPAGE);
473 if (bytes) {
474 aclnode->z_acldata = kmem_alloc(bytes, KM_PUSHPAGE);
475 aclnode->z_allocdata = aclnode->z_acldata;
476 aclnode->z_allocsize = bytes;
477 aclnode->z_size = bytes;
478 }
479
480 return (aclnode);
481 }
482
483 static void
484 zfs_acl_node_free(zfs_acl_node_t *aclnode)
485 {
486 if (aclnode->z_allocsize)
487 kmem_free(aclnode->z_allocdata, aclnode->z_allocsize);
488 kmem_free(aclnode, sizeof (zfs_acl_node_t));
489 }
490
491 static void
492 zfs_acl_release_nodes(zfs_acl_t *aclp)
493 {
494 zfs_acl_node_t *aclnode;
495
496 while ((aclnode = list_head(&aclp->z_acl))) {
497 list_remove(&aclp->z_acl, aclnode);
498 zfs_acl_node_free(aclnode);
499 }
500 aclp->z_acl_count = 0;
501 aclp->z_acl_bytes = 0;
502 }
503
504 void
505 zfs_acl_free(zfs_acl_t *aclp)
506 {
507 zfs_acl_release_nodes(aclp);
508 list_destroy(&aclp->z_acl);
509 kmem_free(aclp, sizeof (zfs_acl_t));
510 }
511
512 static boolean_t
513 zfs_acl_valid_ace_type(uint_t type, uint_t flags)
514 {
515 uint16_t entry_type;
516
517 switch (type) {
518 case ALLOW:
519 case DENY:
520 case ACE_SYSTEM_AUDIT_ACE_TYPE:
521 case ACE_SYSTEM_ALARM_ACE_TYPE:
522 entry_type = flags & ACE_TYPE_FLAGS;
523 return (entry_type == ACE_OWNER ||
524 entry_type == OWNING_GROUP ||
525 entry_type == ACE_EVERYONE || entry_type == 0 ||
526 entry_type == ACE_IDENTIFIER_GROUP);
527 default:
528 if (type >= MIN_ACE_TYPE && type <= MAX_ACE_TYPE)
529 return (B_TRUE);
530 }
531 return (B_FALSE);
532 }
533
534 static boolean_t
535 zfs_ace_valid(umode_t obj_mode, zfs_acl_t *aclp, uint16_t type, uint16_t iflags)
536 {
537 /*
538 * first check type of entry
539 */
540
541 if (!zfs_acl_valid_ace_type(type, iflags))
542 return (B_FALSE);
543
544 switch (type) {
545 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
546 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
547 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
548 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
549 if (aclp->z_version < ZFS_ACL_VERSION_FUID)
550 return (B_FALSE);
551 aclp->z_hints |= ZFS_ACL_OBJ_ACE;
552 }
553
554 /*
555 * next check inheritance level flags
556 */
557
558 if (S_ISDIR(obj_mode) &&
559 (iflags & (ACE_FILE_INHERIT_ACE|ACE_DIRECTORY_INHERIT_ACE)))
560 aclp->z_hints |= ZFS_INHERIT_ACE;
561
562 if (iflags & (ACE_INHERIT_ONLY_ACE|ACE_NO_PROPAGATE_INHERIT_ACE)) {
563 if ((iflags & (ACE_FILE_INHERIT_ACE|
564 ACE_DIRECTORY_INHERIT_ACE)) == 0) {
565 return (B_FALSE);
566 }
567 }
568
569 return (B_TRUE);
570 }
571
572 static void *
573 zfs_acl_next_ace(zfs_acl_t *aclp, void *start, uint64_t *who,
574 uint32_t *access_mask, uint16_t *iflags, uint16_t *type)
575 {
576 zfs_acl_node_t *aclnode;
577
578 ASSERT(aclp);
579
580 if (start == NULL) {
581 aclnode = list_head(&aclp->z_acl);
582 if (aclnode == NULL)
583 return (NULL);
584
585 aclp->z_next_ace = aclnode->z_acldata;
586 aclp->z_curr_node = aclnode;
587 aclnode->z_ace_idx = 0;
588 }
589
590 aclnode = aclp->z_curr_node;
591
592 if (aclnode == NULL)
593 return (NULL);
594
595 if (aclnode->z_ace_idx >= aclnode->z_ace_count) {
596 aclnode = list_next(&aclp->z_acl, aclnode);
597 if (aclnode == NULL)
598 return (NULL);
599 else {
600 aclp->z_curr_node = aclnode;
601 aclnode->z_ace_idx = 0;
602 aclp->z_next_ace = aclnode->z_acldata;
603 }
604 }
605
606 if (aclnode->z_ace_idx < aclnode->z_ace_count) {
607 void *acep = aclp->z_next_ace;
608 size_t ace_size;
609
610 /*
611 * Make sure we don't overstep our bounds
612 */
613 ace_size = aclp->z_ops->ace_size(acep);
614
615 if (((caddr_t)acep + ace_size) >
616 ((caddr_t)aclnode->z_acldata + aclnode->z_size)) {
617 return (NULL);
618 }
619
620 *iflags = aclp->z_ops->ace_flags_get(acep);
621 *type = aclp->z_ops->ace_type_get(acep);
622 *access_mask = aclp->z_ops->ace_mask_get(acep);
623 *who = aclp->z_ops->ace_who_get(acep);
624 aclp->z_next_ace = (caddr_t)aclp->z_next_ace + ace_size;
625 aclnode->z_ace_idx++;
626
627 return ((void *)acep);
628 }
629 return (NULL);
630 }
631
632 /*ARGSUSED*/
633 static uint64_t
634 zfs_ace_walk(void *datap, uint64_t cookie, int aclcnt,
635 uint16_t *flags, uint16_t *type, uint32_t *mask)
636 {
637 zfs_acl_t *aclp = datap;
638 zfs_ace_hdr_t *acep = (zfs_ace_hdr_t *)(uintptr_t)cookie;
639 uint64_t who;
640
641 acep = zfs_acl_next_ace(aclp, acep, &who, mask,
642 flags, type);
643 return ((uint64_t)(uintptr_t)acep);
644 }
645
646 /*
647 * Copy ACE to internal ZFS format.
648 * While processing the ACL each ACE will be validated for correctness.
649 * ACE FUIDs will be created later.
650 */
651 int
652 zfs_copy_ace_2_fuid(zfs_sb_t *zsb, umode_t obj_mode, zfs_acl_t *aclp,
653 void *datap, zfs_ace_t *z_acl, uint64_t aclcnt, size_t *size,
654 zfs_fuid_info_t **fuidp, cred_t *cr)
655 {
656 int i;
657 uint16_t entry_type;
658 zfs_ace_t *aceptr = z_acl;
659 ace_t *acep = datap;
660 zfs_object_ace_t *zobjacep;
661 ace_object_t *aceobjp;
662
663 for (i = 0; i != aclcnt; i++) {
664 aceptr->z_hdr.z_access_mask = acep->a_access_mask;
665 aceptr->z_hdr.z_flags = acep->a_flags;
666 aceptr->z_hdr.z_type = acep->a_type;
667 entry_type = aceptr->z_hdr.z_flags & ACE_TYPE_FLAGS;
668 if (entry_type != ACE_OWNER && entry_type != OWNING_GROUP &&
669 entry_type != ACE_EVERYONE) {
670 aceptr->z_fuid = zfs_fuid_create(zsb, acep->a_who,
671 cr, (entry_type == 0) ?
672 ZFS_ACE_USER : ZFS_ACE_GROUP, fuidp);
673 }
674
675 /*
676 * Make sure ACE is valid
677 */
678 if (zfs_ace_valid(obj_mode, aclp, aceptr->z_hdr.z_type,
679 aceptr->z_hdr.z_flags) != B_TRUE)
680 return (SET_ERROR(EINVAL));
681
682 switch (acep->a_type) {
683 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
684 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
685 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
686 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
687 zobjacep = (zfs_object_ace_t *)aceptr;
688 aceobjp = (ace_object_t *)acep;
689
690 bcopy(aceobjp->a_obj_type, zobjacep->z_object_type,
691 sizeof (aceobjp->a_obj_type));
692 bcopy(aceobjp->a_inherit_obj_type,
693 zobjacep->z_inherit_type,
694 sizeof (aceobjp->a_inherit_obj_type));
695 acep = (ace_t *)((caddr_t)acep + sizeof (ace_object_t));
696 break;
697 default:
698 acep = (ace_t *)((caddr_t)acep + sizeof (ace_t));
699 }
700
701 aceptr = (zfs_ace_t *)((caddr_t)aceptr +
702 aclp->z_ops->ace_size(aceptr));
703 }
704
705 *size = (caddr_t)aceptr - (caddr_t)z_acl;
706
707 return (0);
708 }
709
710 /*
711 * Copy ZFS ACEs to fixed size ace_t layout
712 */
713 static void
714 zfs_copy_fuid_2_ace(zfs_sb_t *zsb, zfs_acl_t *aclp, cred_t *cr,
715 void *datap, int filter)
716 {
717 uint64_t who;
718 uint32_t access_mask;
719 uint16_t iflags, type;
720 zfs_ace_hdr_t *zacep = NULL;
721 ace_t *acep = datap;
722 ace_object_t *objacep;
723 zfs_object_ace_t *zobjacep;
724 size_t ace_size;
725 uint16_t entry_type;
726
727 while ((zacep = zfs_acl_next_ace(aclp, zacep,
728 &who, &access_mask, &iflags, &type))) {
729
730 switch (type) {
731 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
732 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
733 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
734 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
735 if (filter) {
736 continue;
737 }
738 zobjacep = (zfs_object_ace_t *)zacep;
739 objacep = (ace_object_t *)acep;
740 bcopy(zobjacep->z_object_type,
741 objacep->a_obj_type,
742 sizeof (zobjacep->z_object_type));
743 bcopy(zobjacep->z_inherit_type,
744 objacep->a_inherit_obj_type,
745 sizeof (zobjacep->z_inherit_type));
746 ace_size = sizeof (ace_object_t);
747 break;
748 default:
749 ace_size = sizeof (ace_t);
750 break;
751 }
752
753 entry_type = (iflags & ACE_TYPE_FLAGS);
754 if ((entry_type != ACE_OWNER &&
755 entry_type != OWNING_GROUP &&
756 entry_type != ACE_EVERYONE)) {
757 acep->a_who = zfs_fuid_map_id(zsb, who,
758 cr, (entry_type & ACE_IDENTIFIER_GROUP) ?
759 ZFS_ACE_GROUP : ZFS_ACE_USER);
760 } else {
761 acep->a_who = (uid_t)(int64_t)who;
762 }
763 acep->a_access_mask = access_mask;
764 acep->a_flags = iflags;
765 acep->a_type = type;
766 acep = (ace_t *)((caddr_t)acep + ace_size);
767 }
768 }
769
770 static int
771 zfs_copy_ace_2_oldace(umode_t obj_mode, zfs_acl_t *aclp, ace_t *acep,
772 zfs_oldace_t *z_acl, int aclcnt, size_t *size)
773 {
774 int i;
775 zfs_oldace_t *aceptr = z_acl;
776
777 for (i = 0; i != aclcnt; i++, aceptr++) {
778 aceptr->z_access_mask = acep[i].a_access_mask;
779 aceptr->z_type = acep[i].a_type;
780 aceptr->z_flags = acep[i].a_flags;
781 aceptr->z_fuid = acep[i].a_who;
782 /*
783 * Make sure ACE is valid
784 */
785 if (zfs_ace_valid(obj_mode, aclp, aceptr->z_type,
786 aceptr->z_flags) != B_TRUE)
787 return (SET_ERROR(EINVAL));
788 }
789 *size = (caddr_t)aceptr - (caddr_t)z_acl;
790 return (0);
791 }
792
793 /*
794 * convert old ACL format to new
795 */
796 void
797 zfs_acl_xform(znode_t *zp, zfs_acl_t *aclp, cred_t *cr)
798 {
799 zfs_oldace_t *oldaclp;
800 int i;
801 uint16_t type, iflags;
802 uint32_t access_mask;
803 uint64_t who;
804 void *cookie = NULL;
805 zfs_acl_node_t *newaclnode;
806
807 ASSERT(aclp->z_version == ZFS_ACL_VERSION_INITIAL);
808 /*
809 * First create the ACE in a contiguous piece of memory
810 * for zfs_copy_ace_2_fuid().
811 *
812 * We only convert an ACL once, so this won't happen
813 * everytime.
814 */
815 oldaclp = kmem_alloc(sizeof (zfs_oldace_t) * aclp->z_acl_count,
816 KM_SLEEP);
817 i = 0;
818 while ((cookie = zfs_acl_next_ace(aclp, cookie, &who,
819 &access_mask, &iflags, &type))) {
820 oldaclp[i].z_flags = iflags;
821 oldaclp[i].z_type = type;
822 oldaclp[i].z_fuid = who;
823 oldaclp[i++].z_access_mask = access_mask;
824 }
825
826 newaclnode = zfs_acl_node_alloc(aclp->z_acl_count *
827 sizeof (zfs_object_ace_t));
828 aclp->z_ops = &zfs_acl_fuid_ops;
829 VERIFY(zfs_copy_ace_2_fuid(ZTOZSB(zp), ZTOI(zp)->i_mode,
830 aclp, oldaclp, newaclnode->z_acldata, aclp->z_acl_count,
831 &newaclnode->z_size, NULL, cr) == 0);
832 newaclnode->z_ace_count = aclp->z_acl_count;
833 aclp->z_version = ZFS_ACL_VERSION;
834 kmem_free(oldaclp, aclp->z_acl_count * sizeof (zfs_oldace_t));
835
836 /*
837 * Release all previous ACL nodes
838 */
839
840 zfs_acl_release_nodes(aclp);
841
842 list_insert_head(&aclp->z_acl, newaclnode);
843
844 aclp->z_acl_bytes = newaclnode->z_size;
845 aclp->z_acl_count = newaclnode->z_ace_count;
846
847 }
848
849 /*
850 * Convert unix access mask to v4 access mask
851 */
852 static uint32_t
853 zfs_unix_to_v4(uint32_t access_mask)
854 {
855 uint32_t new_mask = 0;
856
857 if (access_mask & S_IXOTH)
858 new_mask |= ACE_EXECUTE;
859 if (access_mask & S_IWOTH)
860 new_mask |= ACE_WRITE_DATA;
861 if (access_mask & S_IROTH)
862 new_mask |= ACE_READ_DATA;
863 return (new_mask);
864 }
865
866 static void
867 zfs_set_ace(zfs_acl_t *aclp, void *acep, uint32_t access_mask,
868 uint16_t access_type, uint64_t fuid, uint16_t entry_type)
869 {
870 uint16_t type = entry_type & ACE_TYPE_FLAGS;
871
872 aclp->z_ops->ace_mask_set(acep, access_mask);
873 aclp->z_ops->ace_type_set(acep, access_type);
874 aclp->z_ops->ace_flags_set(acep, entry_type);
875 if ((type != ACE_OWNER && type != OWNING_GROUP &&
876 type != ACE_EVERYONE))
877 aclp->z_ops->ace_who_set(acep, fuid);
878 }
879
880 /*
881 * Determine mode of file based on ACL.
882 * Also, create FUIDs for any User/Group ACEs
883 */
884 uint64_t
885 zfs_mode_compute(uint64_t fmode, zfs_acl_t *aclp,
886 uint64_t *pflags, uint64_t fuid, uint64_t fgid)
887 {
888 int entry_type;
889 mode_t mode;
890 mode_t seen = 0;
891 zfs_ace_hdr_t *acep = NULL;
892 uint64_t who;
893 uint16_t iflags, type;
894 uint32_t access_mask;
895 boolean_t an_exec_denied = B_FALSE;
896
897 mode = (fmode & (S_IFMT | S_ISUID | S_ISGID | S_ISVTX));
898
899 while ((acep = zfs_acl_next_ace(aclp, acep, &who,
900 &access_mask, &iflags, &type))) {
901
902 if (!zfs_acl_valid_ace_type(type, iflags))
903 continue;
904
905 entry_type = (iflags & ACE_TYPE_FLAGS);
906
907 /*
908 * Skip over owner@, group@ or everyone@ inherit only ACEs
909 */
910 if ((iflags & ACE_INHERIT_ONLY_ACE) &&
911 (entry_type == ACE_OWNER || entry_type == ACE_EVERYONE ||
912 entry_type == OWNING_GROUP))
913 continue;
914
915 if (entry_type == ACE_OWNER || (entry_type == 0 &&
916 who == fuid)) {
917 if ((access_mask & ACE_READ_DATA) &&
918 (!(seen & S_IRUSR))) {
919 seen |= S_IRUSR;
920 if (type == ALLOW) {
921 mode |= S_IRUSR;
922 }
923 }
924 if ((access_mask & ACE_WRITE_DATA) &&
925 (!(seen & S_IWUSR))) {
926 seen |= S_IWUSR;
927 if (type == ALLOW) {
928 mode |= S_IWUSR;
929 }
930 }
931 if ((access_mask & ACE_EXECUTE) &&
932 (!(seen & S_IXUSR))) {
933 seen |= S_IXUSR;
934 if (type == ALLOW) {
935 mode |= S_IXUSR;
936 }
937 }
938 } else if (entry_type == OWNING_GROUP ||
939 (entry_type == ACE_IDENTIFIER_GROUP && who == fgid)) {
940 if ((access_mask & ACE_READ_DATA) &&
941 (!(seen & S_IRGRP))) {
942 seen |= S_IRGRP;
943 if (type == ALLOW) {
944 mode |= S_IRGRP;
945 }
946 }
947 if ((access_mask & ACE_WRITE_DATA) &&
948 (!(seen & S_IWGRP))) {
949 seen |= S_IWGRP;
950 if (type == ALLOW) {
951 mode |= S_IWGRP;
952 }
953 }
954 if ((access_mask & ACE_EXECUTE) &&
955 (!(seen & S_IXGRP))) {
956 seen |= S_IXGRP;
957 if (type == ALLOW) {
958 mode |= S_IXGRP;
959 }
960 }
961 } else if (entry_type == ACE_EVERYONE) {
962 if ((access_mask & ACE_READ_DATA)) {
963 if (!(seen & S_IRUSR)) {
964 seen |= S_IRUSR;
965 if (type == ALLOW) {
966 mode |= S_IRUSR;
967 }
968 }
969 if (!(seen & S_IRGRP)) {
970 seen |= S_IRGRP;
971 if (type == ALLOW) {
972 mode |= S_IRGRP;
973 }
974 }
975 if (!(seen & S_IROTH)) {
976 seen |= S_IROTH;
977 if (type == ALLOW) {
978 mode |= S_IROTH;
979 }
980 }
981 }
982 if ((access_mask & ACE_WRITE_DATA)) {
983 if (!(seen & S_IWUSR)) {
984 seen |= S_IWUSR;
985 if (type == ALLOW) {
986 mode |= S_IWUSR;
987 }
988 }
989 if (!(seen & S_IWGRP)) {
990 seen |= S_IWGRP;
991 if (type == ALLOW) {
992 mode |= S_IWGRP;
993 }
994 }
995 if (!(seen & S_IWOTH)) {
996 seen |= S_IWOTH;
997 if (type == ALLOW) {
998 mode |= S_IWOTH;
999 }
1000 }
1001 }
1002 if ((access_mask & ACE_EXECUTE)) {
1003 if (!(seen & S_IXUSR)) {
1004 seen |= S_IXUSR;
1005 if (type == ALLOW) {
1006 mode |= S_IXUSR;
1007 }
1008 }
1009 if (!(seen & S_IXGRP)) {
1010 seen |= S_IXGRP;
1011 if (type == ALLOW) {
1012 mode |= S_IXGRP;
1013 }
1014 }
1015 if (!(seen & S_IXOTH)) {
1016 seen |= S_IXOTH;
1017 if (type == ALLOW) {
1018 mode |= S_IXOTH;
1019 }
1020 }
1021 }
1022 } else {
1023 /*
1024 * Only care if this IDENTIFIER_GROUP or
1025 * USER ACE denies execute access to someone,
1026 * mode is not affected
1027 */
1028 if ((access_mask & ACE_EXECUTE) && type == DENY)
1029 an_exec_denied = B_TRUE;
1030 }
1031 }
1032
1033 /*
1034 * Failure to allow is effectively a deny, so execute permission
1035 * is denied if it was never mentioned or if we explicitly
1036 * weren't allowed it.
1037 */
1038 if (!an_exec_denied &&
1039 ((seen & ALL_MODE_EXECS) != ALL_MODE_EXECS ||
1040 (mode & ALL_MODE_EXECS) != ALL_MODE_EXECS))
1041 an_exec_denied = B_TRUE;
1042
1043 if (an_exec_denied)
1044 *pflags &= ~ZFS_NO_EXECS_DENIED;
1045 else
1046 *pflags |= ZFS_NO_EXECS_DENIED;
1047
1048 return (mode);
1049 }
1050
1051 /*
1052 * Read an external acl object. If the intent is to modify, always
1053 * create a new acl and leave any cached acl in place.
1054 */
1055 static int
1056 zfs_acl_node_read(znode_t *zp, boolean_t have_lock, zfs_acl_t **aclpp,
1057 boolean_t will_modify)
1058 {
1059 zfs_acl_t *aclp;
1060 int aclsize = 0;
1061 int acl_count = 0;
1062 zfs_acl_node_t *aclnode;
1063 zfs_acl_phys_t znode_acl;
1064 int version;
1065 int error;
1066 boolean_t drop_lock = B_FALSE;
1067
1068 ASSERT(MUTEX_HELD(&zp->z_acl_lock));
1069
1070 if (zp->z_acl_cached && !will_modify) {
1071 *aclpp = zp->z_acl_cached;
1072 return (0);
1073 }
1074
1075 /*
1076 * close race where znode could be upgrade while trying to
1077 * read the znode attributes.
1078 *
1079 * But this could only happen if the file isn't already an SA
1080 * znode
1081 */
1082 if (!zp->z_is_sa && !have_lock) {
1083 mutex_enter(&zp->z_lock);
1084 drop_lock = B_TRUE;
1085 }
1086 version = zfs_znode_acl_version(zp);
1087
1088 if ((error = zfs_acl_znode_info(zp, &aclsize,
1089 &acl_count, &znode_acl)) != 0) {
1090 goto done;
1091 }
1092
1093 aclp = zfs_acl_alloc(version);
1094
1095 aclp->z_acl_count = acl_count;
1096 aclp->z_acl_bytes = aclsize;
1097
1098 aclnode = zfs_acl_node_alloc(aclsize);
1099 aclnode->z_ace_count = aclp->z_acl_count;
1100 aclnode->z_size = aclsize;
1101
1102 if (!zp->z_is_sa) {
1103 if (znode_acl.z_acl_extern_obj) {
1104 error = dmu_read(ZTOZSB(zp)->z_os,
1105 znode_acl.z_acl_extern_obj, 0, aclnode->z_size,
1106 aclnode->z_acldata, DMU_READ_PREFETCH);
1107 } else {
1108 bcopy(znode_acl.z_ace_data, aclnode->z_acldata,
1109 aclnode->z_size);
1110 }
1111 } else {
1112 error = sa_lookup(zp->z_sa_hdl, SA_ZPL_DACL_ACES(ZTOZSB(zp)),
1113 aclnode->z_acldata, aclnode->z_size);
1114 }
1115
1116 if (error != 0) {
1117 zfs_acl_free(aclp);
1118 zfs_acl_node_free(aclnode);
1119 /* convert checksum errors into IO errors */
1120 if (error == ECKSUM)
1121 error = SET_ERROR(EIO);
1122 goto done;
1123 }
1124
1125 list_insert_head(&aclp->z_acl, aclnode);
1126
1127 *aclpp = aclp;
1128 if (!will_modify)
1129 zp->z_acl_cached = aclp;
1130 done:
1131 if (drop_lock)
1132 mutex_exit(&zp->z_lock);
1133 return (error);
1134 }
1135
1136 /*ARGSUSED*/
1137 void
1138 zfs_acl_data_locator(void **dataptr, uint32_t *length, uint32_t buflen,
1139 boolean_t start, void *userdata)
1140 {
1141 zfs_acl_locator_cb_t *cb = (zfs_acl_locator_cb_t *)userdata;
1142
1143 if (start) {
1144 cb->cb_acl_node = list_head(&cb->cb_aclp->z_acl);
1145 } else {
1146 cb->cb_acl_node = list_next(&cb->cb_aclp->z_acl,
1147 cb->cb_acl_node);
1148 }
1149 *dataptr = cb->cb_acl_node->z_acldata;
1150 *length = cb->cb_acl_node->z_size;
1151 }
1152
1153 int
1154 zfs_acl_chown_setattr(znode_t *zp)
1155 {
1156 int error;
1157 zfs_acl_t *aclp;
1158
1159 if (ZTOZSB(zp)->z_acl_type == ZFS_ACLTYPE_POSIXACL)
1160 return 0;
1161
1162 ASSERT(MUTEX_HELD(&zp->z_lock));
1163 ASSERT(MUTEX_HELD(&zp->z_acl_lock));
1164
1165 if ((error = zfs_acl_node_read(zp, B_TRUE, &aclp, B_FALSE)) == 0)
1166 zp->z_mode = zfs_mode_compute(zp->z_mode, aclp,
1167 &zp->z_pflags, zp->z_uid, zp->z_gid);
1168 return (error);
1169 }
1170
1171 static void
1172 acl_trivial_access_masks(mode_t mode, uint32_t *allow0, uint32_t *deny1,
1173 uint32_t *deny2, uint32_t *owner, uint32_t *group, uint32_t *everyone)
1174 {
1175 *deny1 = *deny2 = *allow0 = *group = 0;
1176
1177 if (!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH)))
1178 *deny1 |= ACE_READ_DATA;
1179 if (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IWOTH)))
1180 *deny1 |= ACE_WRITE_DATA;
1181 if (!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH)))
1182 *deny1 |= ACE_EXECUTE;
1183
1184 if (!(mode & S_IRGRP) && (mode & S_IROTH))
1185 *deny2 = ACE_READ_DATA;
1186 if (!(mode & S_IWGRP) && (mode & S_IWOTH))
1187 *deny2 |= ACE_WRITE_DATA;
1188 if (!(mode & S_IXGRP) && (mode & S_IXOTH))
1189 *deny2 |= ACE_EXECUTE;
1190
1191 if ((mode & S_IRUSR) && (!(mode & S_IRGRP) && (mode & S_IROTH)))
1192 *allow0 |= ACE_READ_DATA;
1193 if ((mode & S_IWUSR) && (!(mode & S_IWGRP) && (mode & S_IWOTH)))
1194 *allow0 |= ACE_WRITE_DATA;
1195 if ((mode & S_IXUSR) && (!(mode & S_IXGRP) && (mode & S_IXOTH)))
1196 *allow0 |= ACE_EXECUTE;
1197
1198 *owner = ACE_WRITE_ATTRIBUTES|ACE_WRITE_OWNER|ACE_WRITE_ACL|
1199 ACE_WRITE_NAMED_ATTRS|ACE_READ_ACL|ACE_READ_ATTRIBUTES|
1200 ACE_READ_NAMED_ATTRS|ACE_SYNCHRONIZE;
1201 if (mode & S_IRUSR)
1202 *owner |= ACE_READ_DATA;
1203 if (mode & S_IWUSR)
1204 *owner |= ACE_WRITE_DATA|ACE_APPEND_DATA;
1205 if (mode & S_IXUSR)
1206 *owner |= ACE_EXECUTE;
1207
1208 *group = ACE_READ_ACL|ACE_READ_ATTRIBUTES| ACE_READ_NAMED_ATTRS|
1209 ACE_SYNCHRONIZE;
1210 if (mode & S_IRGRP)
1211 *group |= ACE_READ_DATA;
1212 if (mode & S_IWGRP)
1213 *group |= ACE_WRITE_DATA|ACE_APPEND_DATA;
1214 if (mode & S_IXGRP)
1215 *group |= ACE_EXECUTE;
1216
1217 *everyone = ACE_READ_ACL|ACE_READ_ATTRIBUTES| ACE_READ_NAMED_ATTRS|
1218 ACE_SYNCHRONIZE;
1219 if (mode & S_IROTH)
1220 *everyone |= ACE_READ_DATA;
1221 if (mode & S_IWOTH)
1222 *everyone |= ACE_WRITE_DATA|ACE_APPEND_DATA;
1223 if (mode & S_IXOTH)
1224 *everyone |= ACE_EXECUTE;
1225 }
1226
1227 /*
1228 * ace_trivial:
1229 * determine whether an ace_t acl is trivial
1230 *
1231 * Trivialness implies that the acl is composed of only
1232 * owner, group, everyone entries. ACL can't
1233 * have read_acl denied, and write_owner/write_acl/write_attributes
1234 * can only be owner@ entry.
1235 */
1236 static int
1237 ace_trivial_common(void *acep, int aclcnt,
1238 uint64_t (*walk)(void *, uint64_t, int aclcnt,
1239 uint16_t *, uint16_t *, uint32_t *))
1240 {
1241 uint16_t flags;
1242 uint32_t mask;
1243 uint16_t type;
1244 uint64_t cookie = 0;
1245
1246 while ((cookie = walk(acep, cookie, aclcnt, &flags, &type, &mask))) {
1247 switch (flags & ACE_TYPE_FLAGS) {
1248 case ACE_OWNER:
1249 case ACE_GROUP|ACE_IDENTIFIER_GROUP:
1250 case ACE_EVERYONE:
1251 break;
1252 default:
1253 return (1);
1254 }
1255
1256 if (flags & (ACE_FILE_INHERIT_ACE|
1257 ACE_DIRECTORY_INHERIT_ACE|ACE_NO_PROPAGATE_INHERIT_ACE|
1258 ACE_INHERIT_ONLY_ACE))
1259 return (1);
1260
1261 /*
1262 * Special check for some special bits
1263 *
1264 * Don't allow anybody to deny reading basic
1265 * attributes or a files ACL.
1266 */
1267 if ((mask & (ACE_READ_ACL|ACE_READ_ATTRIBUTES)) &&
1268 (type == ACE_ACCESS_DENIED_ACE_TYPE))
1269 return (1);
1270
1271 /*
1272 * Delete permissions are never set by default
1273 */
1274 if (mask & (ACE_DELETE|ACE_DELETE_CHILD))
1275 return (1);
1276 /*
1277 * only allow owner@ to have
1278 * write_acl/write_owner/write_attributes/write_xattr/
1279 */
1280 if (type == ACE_ACCESS_ALLOWED_ACE_TYPE &&
1281 (!(flags & ACE_OWNER) && (mask &
1282 (ACE_WRITE_OWNER|ACE_WRITE_ACL| ACE_WRITE_ATTRIBUTES|
1283 ACE_WRITE_NAMED_ATTRS))))
1284 return (1);
1285
1286 }
1287
1288 return (0);
1289 }
1290
1291 /*
1292 * common code for setting ACLs.
1293 *
1294 * This function is called from zfs_mode_update, zfs_perm_init, and zfs_setacl.
1295 * zfs_setacl passes a non-NULL inherit pointer (ihp) to indicate that it's
1296 * already checked the acl and knows whether to inherit.
1297 */
1298 int
1299 zfs_aclset_common(znode_t *zp, zfs_acl_t *aclp, cred_t *cr, dmu_tx_t *tx)
1300 {
1301 int error;
1302 zfs_sb_t *zsb = ZTOZSB(zp);
1303 dmu_object_type_t otype;
1304 zfs_acl_locator_cb_t locate = { 0 };
1305 uint64_t mode;
1306 sa_bulk_attr_t bulk[5];
1307 uint64_t ctime[2];
1308 int count = 0;
1309
1310 mode = zp->z_mode;
1311
1312 mode = zfs_mode_compute(mode, aclp, &zp->z_pflags,
1313 zp->z_uid, zp->z_gid);
1314
1315 zp->z_mode = mode;
1316 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zsb), NULL,
1317 &mode, sizeof (mode));
1318 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zsb), NULL,
1319 &zp->z_pflags, sizeof (zp->z_pflags));
1320 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zsb), NULL,
1321 &ctime, sizeof (ctime));
1322
1323 if (zp->z_acl_cached) {
1324 zfs_acl_free(zp->z_acl_cached);
1325 zp->z_acl_cached = NULL;
1326 }
1327
1328 /*
1329 * Upgrade needed?
1330 */
1331 if (!zsb->z_use_fuids) {
1332 otype = DMU_OT_OLDACL;
1333 } else {
1334 if ((aclp->z_version == ZFS_ACL_VERSION_INITIAL) &&
1335 (zsb->z_version >= ZPL_VERSION_FUID))
1336 zfs_acl_xform(zp, aclp, cr);
1337 ASSERT(aclp->z_version >= ZFS_ACL_VERSION_FUID);
1338 otype = DMU_OT_ACL;
1339 }
1340
1341 /*
1342 * Arrgh, we have to handle old on disk format
1343 * as well as newer (preferred) SA format.
1344 */
1345
1346 if (zp->z_is_sa) { /* the easy case, just update the ACL attribute */
1347 locate.cb_aclp = aclp;
1348 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_DACL_ACES(zsb),
1349 zfs_acl_data_locator, &locate, aclp->z_acl_bytes);
1350 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_DACL_COUNT(zsb),
1351 NULL, &aclp->z_acl_count, sizeof (uint64_t));
1352 } else { /* Painful legacy way */
1353 zfs_acl_node_t *aclnode;
1354 uint64_t off = 0;
1355 zfs_acl_phys_t acl_phys;
1356 uint64_t aoid;
1357
1358 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_ZNODE_ACL(zsb),
1359 &acl_phys, sizeof (acl_phys))) != 0)
1360 return (error);
1361
1362 aoid = acl_phys.z_acl_extern_obj;
1363
1364 if (aclp->z_acl_bytes > ZFS_ACE_SPACE) {
1365 /*
1366 * If ACL was previously external and we are now
1367 * converting to new ACL format then release old
1368 * ACL object and create a new one.
1369 */
1370 if (aoid &&
1371 aclp->z_version != acl_phys.z_acl_version) {
1372 error = dmu_object_free(zsb->z_os, aoid, tx);
1373 if (error)
1374 return (error);
1375 aoid = 0;
1376 }
1377 if (aoid == 0) {
1378 aoid = dmu_object_alloc(zsb->z_os,
1379 otype, aclp->z_acl_bytes,
1380 otype == DMU_OT_ACL ?
1381 DMU_OT_SYSACL : DMU_OT_NONE,
1382 otype == DMU_OT_ACL ?
1383 DN_MAX_BONUSLEN : 0, tx);
1384 } else {
1385 (void) dmu_object_set_blocksize(zsb->z_os,
1386 aoid, aclp->z_acl_bytes, 0, tx);
1387 }
1388 acl_phys.z_acl_extern_obj = aoid;
1389 for (aclnode = list_head(&aclp->z_acl); aclnode;
1390 aclnode = list_next(&aclp->z_acl, aclnode)) {
1391 if (aclnode->z_ace_count == 0)
1392 continue;
1393 dmu_write(zsb->z_os, aoid, off,
1394 aclnode->z_size, aclnode->z_acldata, tx);
1395 off += aclnode->z_size;
1396 }
1397 } else {
1398 void *start = acl_phys.z_ace_data;
1399 /*
1400 * Migrating back embedded?
1401 */
1402 if (acl_phys.z_acl_extern_obj) {
1403 error = dmu_object_free(zsb->z_os,
1404 acl_phys.z_acl_extern_obj, tx);
1405 if (error)
1406 return (error);
1407 acl_phys.z_acl_extern_obj = 0;
1408 }
1409
1410 for (aclnode = list_head(&aclp->z_acl); aclnode;
1411 aclnode = list_next(&aclp->z_acl, aclnode)) {
1412 if (aclnode->z_ace_count == 0)
1413 continue;
1414 bcopy(aclnode->z_acldata, start,
1415 aclnode->z_size);
1416 start = (caddr_t)start + aclnode->z_size;
1417 }
1418 }
1419 /*
1420 * If Old version then swap count/bytes to match old
1421 * layout of znode_acl_phys_t.
1422 */
1423 if (aclp->z_version == ZFS_ACL_VERSION_INITIAL) {
1424 acl_phys.z_acl_size = aclp->z_acl_count;
1425 acl_phys.z_acl_count = aclp->z_acl_bytes;
1426 } else {
1427 acl_phys.z_acl_size = aclp->z_acl_bytes;
1428 acl_phys.z_acl_count = aclp->z_acl_count;
1429 }
1430 acl_phys.z_acl_version = aclp->z_version;
1431
1432 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ZNODE_ACL(zsb), NULL,
1433 &acl_phys, sizeof (acl_phys));
1434 }
1435
1436 /*
1437 * Replace ACL wide bits, but first clear them.
1438 */
1439 zp->z_pflags &= ~ZFS_ACL_WIDE_FLAGS;
1440
1441 zp->z_pflags |= aclp->z_hints;
1442
1443 if (ace_trivial_common(aclp, 0, zfs_ace_walk) == 0)
1444 zp->z_pflags |= ZFS_ACL_TRIVIAL;
1445
1446 zfs_tstamp_update_setup(zp, STATE_CHANGED, NULL, ctime, B_TRUE);
1447 return (sa_bulk_update(zp->z_sa_hdl, bulk, count, tx));
1448 }
1449
1450 static void
1451 zfs_acl_chmod(zfs_sb_t *zsb, uint64_t mode, zfs_acl_t *aclp)
1452 {
1453 void *acep = NULL;
1454 uint64_t who;
1455 int new_count, new_bytes;
1456 int ace_size;
1457 int entry_type;
1458 uint16_t iflags, type;
1459 uint32_t access_mask;
1460 zfs_acl_node_t *newnode;
1461 size_t abstract_size = aclp->z_ops->ace_abstract_size();
1462 void *zacep;
1463 uint32_t owner, group, everyone;
1464 uint32_t deny1, deny2, allow0;
1465
1466 new_count = new_bytes = 0;
1467
1468 acl_trivial_access_masks((mode_t)mode, &allow0, &deny1, &deny2,
1469 &owner, &group, &everyone);
1470
1471 newnode = zfs_acl_node_alloc((abstract_size * 6) + aclp->z_acl_bytes);
1472
1473 zacep = newnode->z_acldata;
1474 if (allow0) {
1475 zfs_set_ace(aclp, zacep, allow0, ALLOW, -1, ACE_OWNER);
1476 zacep = (void *)((uintptr_t)zacep + abstract_size);
1477 new_count++;
1478 new_bytes += abstract_size;
1479 }
1480 if (deny1) {
1481 zfs_set_ace(aclp, zacep, deny1, DENY, -1, ACE_OWNER);
1482 zacep = (void *)((uintptr_t)zacep + abstract_size);
1483 new_count++;
1484 new_bytes += abstract_size;
1485 }
1486 if (deny2) {
1487 zfs_set_ace(aclp, zacep, deny2, DENY, -1, OWNING_GROUP);
1488 zacep = (void *)((uintptr_t)zacep + abstract_size);
1489 new_count++;
1490 new_bytes += abstract_size;
1491 }
1492
1493 while ((acep = zfs_acl_next_ace(aclp, acep, &who, &access_mask,
1494 &iflags, &type))) {
1495 uint16_t inherit_flags;
1496
1497 entry_type = (iflags & ACE_TYPE_FLAGS);
1498 inherit_flags = (iflags & ALL_INHERIT);
1499
1500 if ((entry_type == ACE_OWNER || entry_type == ACE_EVERYONE ||
1501 (entry_type == OWNING_GROUP)) &&
1502 ((inherit_flags & ACE_INHERIT_ONLY_ACE) == 0)) {
1503 continue;
1504 }
1505
1506 if ((type != ALLOW && type != DENY) ||
1507 (inherit_flags & ACE_INHERIT_ONLY_ACE)) {
1508 if (inherit_flags)
1509 aclp->z_hints |= ZFS_INHERIT_ACE;
1510 switch (type) {
1511 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
1512 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
1513 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
1514 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
1515 aclp->z_hints |= ZFS_ACL_OBJ_ACE;
1516 break;
1517 }
1518 } else {
1519
1520 /*
1521 * Limit permissions to be no greater than
1522 * group permissions
1523 */
1524 if (zsb->z_acl_inherit == ZFS_ACL_RESTRICTED) {
1525 if (!(mode & S_IRGRP))
1526 access_mask &= ~ACE_READ_DATA;
1527 if (!(mode & S_IWGRP))
1528 access_mask &=
1529 ~(ACE_WRITE_DATA|ACE_APPEND_DATA);
1530 if (!(mode & S_IXGRP))
1531 access_mask &= ~ACE_EXECUTE;
1532 access_mask &=
1533 ~(ACE_WRITE_OWNER|ACE_WRITE_ACL|
1534 ACE_WRITE_ATTRIBUTES|ACE_WRITE_NAMED_ATTRS);
1535 }
1536 }
1537 zfs_set_ace(aclp, zacep, access_mask, type, who, iflags);
1538 ace_size = aclp->z_ops->ace_size(acep);
1539 zacep = (void *)((uintptr_t)zacep + ace_size);
1540 new_count++;
1541 new_bytes += ace_size;
1542 }
1543 zfs_set_ace(aclp, zacep, owner, 0, -1, ACE_OWNER);
1544 zacep = (void *)((uintptr_t)zacep + abstract_size);
1545 zfs_set_ace(aclp, zacep, group, 0, -1, OWNING_GROUP);
1546 zacep = (void *)((uintptr_t)zacep + abstract_size);
1547 zfs_set_ace(aclp, zacep, everyone, 0, -1, ACE_EVERYONE);
1548
1549 new_count += 3;
1550 new_bytes += abstract_size * 3;
1551 zfs_acl_release_nodes(aclp);
1552 aclp->z_acl_count = new_count;
1553 aclp->z_acl_bytes = new_bytes;
1554 newnode->z_ace_count = new_count;
1555 newnode->z_size = new_bytes;
1556 list_insert_tail(&aclp->z_acl, newnode);
1557 }
1558
1559 void
1560 zfs_acl_chmod_setattr(znode_t *zp, zfs_acl_t **aclp, uint64_t mode)
1561 {
1562 mutex_enter(&zp->z_acl_lock);
1563 mutex_enter(&zp->z_lock);
1564 *aclp = zfs_acl_alloc(zfs_acl_version_zp(zp));
1565 (*aclp)->z_hints = zp->z_pflags & V4_ACL_WIDE_FLAGS;
1566 zfs_acl_chmod(ZTOZSB(zp), mode, *aclp);
1567 mutex_exit(&zp->z_lock);
1568 mutex_exit(&zp->z_acl_lock);
1569 ASSERT(*aclp);
1570 }
1571
1572 /*
1573 * strip off write_owner and write_acl
1574 */
1575 static void
1576 zfs_restricted_update(zfs_sb_t *zsb, zfs_acl_t *aclp, void *acep)
1577 {
1578 uint32_t mask = aclp->z_ops->ace_mask_get(acep);
1579
1580 if ((zsb->z_acl_inherit == ZFS_ACL_RESTRICTED) &&
1581 (aclp->z_ops->ace_type_get(acep) == ALLOW)) {
1582 mask &= ~RESTRICTED_CLEAR;
1583 aclp->z_ops->ace_mask_set(acep, mask);
1584 }
1585 }
1586
1587 /*
1588 * Should ACE be inherited?
1589 */
1590 static int
1591 zfs_ace_can_use(umode_t obj_mode, uint16_t acep_flags)
1592 {
1593 int iflags = (acep_flags & 0xf);
1594
1595 if (S_ISDIR(obj_mode) && (iflags & ACE_DIRECTORY_INHERIT_ACE))
1596 return (1);
1597 else if (iflags & ACE_FILE_INHERIT_ACE)
1598 return (!(S_ISDIR(obj_mode) &&
1599 (iflags & ACE_NO_PROPAGATE_INHERIT_ACE)));
1600 return (0);
1601 }
1602
1603 /*
1604 * inherit inheritable ACEs from parent
1605 */
1606 static zfs_acl_t *
1607 zfs_acl_inherit(zfs_sb_t *zsb, umode_t obj_mode, zfs_acl_t *paclp,
1608 uint64_t mode, boolean_t *need_chmod)
1609 {
1610 void *pacep;
1611 void *acep;
1612 zfs_acl_node_t *aclnode;
1613 zfs_acl_t *aclp = NULL;
1614 uint64_t who;
1615 uint32_t access_mask;
1616 uint16_t iflags, newflags, type;
1617 size_t ace_size;
1618 void *data1, *data2;
1619 size_t data1sz, data2sz;
1620 boolean_t vdir = S_ISDIR(obj_mode);
1621 boolean_t vreg = S_ISREG(obj_mode);
1622 boolean_t passthrough, passthrough_x, noallow;
1623
1624 passthrough_x =
1625 zsb->z_acl_inherit == ZFS_ACL_PASSTHROUGH_X;
1626 passthrough = passthrough_x ||
1627 zsb->z_acl_inherit == ZFS_ACL_PASSTHROUGH;
1628 noallow =
1629 zsb->z_acl_inherit == ZFS_ACL_NOALLOW;
1630
1631 *need_chmod = B_TRUE;
1632 pacep = NULL;
1633 aclp = zfs_acl_alloc(paclp->z_version);
1634 if (zsb->z_acl_inherit == ZFS_ACL_DISCARD || S_ISLNK(obj_mode))
1635 return (aclp);
1636 while ((pacep = zfs_acl_next_ace(paclp, pacep, &who,
1637 &access_mask, &iflags, &type))) {
1638
1639 /*
1640 * don't inherit bogus ACEs
1641 */
1642 if (!zfs_acl_valid_ace_type(type, iflags))
1643 continue;
1644
1645 if (noallow && type == ALLOW)
1646 continue;
1647
1648 ace_size = aclp->z_ops->ace_size(pacep);
1649
1650 if (!zfs_ace_can_use(obj_mode, iflags))
1651 continue;
1652
1653 /*
1654 * If owner@, group@, or everyone@ inheritable
1655 * then zfs_acl_chmod() isn't needed.
1656 */
1657 if (passthrough &&
1658 ((iflags & (ACE_OWNER|ACE_EVERYONE)) ||
1659 ((iflags & OWNING_GROUP) ==
1660 OWNING_GROUP)) && (vreg || (vdir && (iflags &
1661 ACE_DIRECTORY_INHERIT_ACE)))) {
1662 *need_chmod = B_FALSE;
1663 }
1664
1665 if (!vdir && passthrough_x &&
1666 ((mode & (S_IXUSR | S_IXGRP | S_IXOTH)) == 0)) {
1667 access_mask &= ~ACE_EXECUTE;
1668 }
1669
1670 aclnode = zfs_acl_node_alloc(ace_size);
1671 list_insert_tail(&aclp->z_acl, aclnode);
1672 acep = aclnode->z_acldata;
1673
1674 zfs_set_ace(aclp, acep, access_mask, type,
1675 who, iflags|ACE_INHERITED_ACE);
1676
1677 /*
1678 * Copy special opaque data if any
1679 */
1680 if ((data1sz = paclp->z_ops->ace_data(pacep, &data1)) != 0) {
1681 VERIFY((data2sz = aclp->z_ops->ace_data(acep,
1682 &data2)) == data1sz);
1683 bcopy(data1, data2, data2sz);
1684 }
1685
1686 aclp->z_acl_count++;
1687 aclnode->z_ace_count++;
1688 aclp->z_acl_bytes += aclnode->z_size;
1689 newflags = aclp->z_ops->ace_flags_get(acep);
1690
1691 if (vdir)
1692 aclp->z_hints |= ZFS_INHERIT_ACE;
1693
1694 if ((iflags & ACE_NO_PROPAGATE_INHERIT_ACE) || !vdir) {
1695 newflags &= ~ALL_INHERIT;
1696 aclp->z_ops->ace_flags_set(acep,
1697 newflags|ACE_INHERITED_ACE);
1698 zfs_restricted_update(zsb, aclp, acep);
1699 continue;
1700 }
1701
1702 ASSERT(vdir);
1703
1704 /*
1705 * If only FILE_INHERIT is set then turn on
1706 * inherit_only
1707 */
1708 if ((iflags & (ACE_FILE_INHERIT_ACE |
1709 ACE_DIRECTORY_INHERIT_ACE)) == ACE_FILE_INHERIT_ACE) {
1710 newflags |= ACE_INHERIT_ONLY_ACE;
1711 aclp->z_ops->ace_flags_set(acep,
1712 newflags|ACE_INHERITED_ACE);
1713 } else {
1714 newflags &= ~ACE_INHERIT_ONLY_ACE;
1715 aclp->z_ops->ace_flags_set(acep,
1716 newflags|ACE_INHERITED_ACE);
1717 }
1718 }
1719 return (aclp);
1720 }
1721
1722 /*
1723 * Create file system object initial permissions
1724 * including inheritable ACEs.
1725 */
1726 int
1727 zfs_acl_ids_create(znode_t *dzp, int flag, vattr_t *vap, cred_t *cr,
1728 vsecattr_t *vsecp, zfs_acl_ids_t *acl_ids)
1729 {
1730 int error;
1731 zfs_sb_t *zsb = ZTOZSB(dzp);
1732 zfs_acl_t *paclp;
1733 #ifdef HAVE_KSID
1734 gid_t gid;
1735 #endif /* HAVE_KSID */
1736 boolean_t need_chmod = B_TRUE;
1737 boolean_t inherited = B_FALSE;
1738
1739 bzero(acl_ids, sizeof (zfs_acl_ids_t));
1740 acl_ids->z_mode = vap->va_mode;
1741
1742 if (vsecp)
1743 if ((error = zfs_vsec_2_aclp(zsb, vap->va_mode, vsecp,
1744 cr, &acl_ids->z_fuidp, &acl_ids->z_aclp)) != 0)
1745 return (error);
1746
1747 acl_ids->z_fuid = vap->va_uid;
1748 acl_ids->z_fgid = vap->va_gid;
1749 #ifdef HAVE_KSID
1750 /*
1751 * Determine uid and gid.
1752 */
1753 if ((flag & IS_ROOT_NODE) || zsb->z_replay ||
1754 ((flag & IS_XATTR) && (S_ISDIR(vap->va_mode)))) {
1755 acl_ids->z_fuid = zfs_fuid_create(zsb, (uint64_t)vap->va_uid,
1756 cr, ZFS_OWNER, &acl_ids->z_fuidp);
1757 acl_ids->z_fgid = zfs_fuid_create(zsb, (uint64_t)vap->va_gid,
1758 cr, ZFS_GROUP, &acl_ids->z_fuidp);
1759 gid = vap->va_gid;
1760 } else {
1761 acl_ids->z_fuid = zfs_fuid_create_cred(zsb, ZFS_OWNER,
1762 cr, &acl_ids->z_fuidp);
1763 acl_ids->z_fgid = 0;
1764 if (vap->va_mask & AT_GID) {
1765 acl_ids->z_fgid = zfs_fuid_create(zsb,
1766 (uint64_t)vap->va_gid,
1767 cr, ZFS_GROUP, &acl_ids->z_fuidp);
1768 gid = vap->va_gid;
1769 if (acl_ids->z_fgid != dzp->z_gid &&
1770 !groupmember(vap->va_gid, cr) &&
1771 secpolicy_vnode_create_gid(cr) != 0)
1772 acl_ids->z_fgid = 0;
1773 }
1774 if (acl_ids->z_fgid == 0) {
1775 if (dzp->z_mode & S_ISGID) {
1776 char *domain;
1777 uint32_t rid;
1778
1779 acl_ids->z_fgid = dzp->z_gid;
1780 gid = zfs_fuid_map_id(zsb, acl_ids->z_fgid,
1781 cr, ZFS_GROUP);
1782
1783 if (zsb->z_use_fuids &&
1784 IS_EPHEMERAL(acl_ids->z_fgid)) {
1785 domain = zfs_fuid_idx_domain(
1786 &zsb->z_fuid_idx,
1787 FUID_INDEX(acl_ids->z_fgid));
1788 rid = FUID_RID(acl_ids->z_fgid);
1789 zfs_fuid_node_add(&acl_ids->z_fuidp,
1790 domain, rid,
1791 FUID_INDEX(acl_ids->z_fgid),
1792 acl_ids->z_fgid, ZFS_GROUP);
1793 }
1794 } else {
1795 acl_ids->z_fgid = zfs_fuid_create_cred(zsb,
1796 ZFS_GROUP, cr, &acl_ids->z_fuidp);
1797 gid = crgetgid(cr);
1798 }
1799 }
1800 }
1801 #endif /* HAVE_KSID */
1802
1803 /*
1804 * If we're creating a directory, and the parent directory has the
1805 * set-GID bit set, set in on the new directory.
1806 * Otherwise, if the user is neither privileged nor a member of the
1807 * file's new group, clear the file's set-GID bit.
1808 */
1809
1810 if (!(flag & IS_ROOT_NODE) && (dzp->z_mode & S_ISGID) &&
1811 (S_ISDIR(vap->va_mode))) {
1812 acl_ids->z_mode |= S_ISGID;
1813 } else {
1814 if ((acl_ids->z_mode & S_ISGID) &&
1815 secpolicy_vnode_setids_setgids(cr, gid) != 0)
1816 acl_ids->z_mode &= ~S_ISGID;
1817 }
1818
1819 if (acl_ids->z_aclp == NULL) {
1820 mutex_enter(&dzp->z_acl_lock);
1821 mutex_enter(&dzp->z_lock);
1822 if (!(flag & IS_ROOT_NODE) && (S_ISDIR(ZTOI(dzp)->i_mode) &&
1823 (dzp->z_pflags & ZFS_INHERIT_ACE)) &&
1824 !(dzp->z_pflags & ZFS_XATTR)) {
1825 VERIFY(0 == zfs_acl_node_read(dzp, B_TRUE,
1826 &paclp, B_FALSE));
1827 acl_ids->z_aclp = zfs_acl_inherit(zsb,
1828 vap->va_mode, paclp, acl_ids->z_mode, &need_chmod);
1829 inherited = B_TRUE;
1830 } else {
1831 acl_ids->z_aclp =
1832 zfs_acl_alloc(zfs_acl_version_zp(dzp));
1833 acl_ids->z_aclp->z_hints |= ZFS_ACL_TRIVIAL;
1834 }
1835 mutex_exit(&dzp->z_lock);
1836 mutex_exit(&dzp->z_acl_lock);
1837 if (need_chmod) {
1838 acl_ids->z_aclp->z_hints |= S_ISDIR(vap->va_mode) ?
1839 ZFS_ACL_AUTO_INHERIT : 0;
1840 zfs_acl_chmod(zsb, acl_ids->z_mode, acl_ids->z_aclp);
1841 }
1842 }
1843
1844 if (inherited || vsecp) {
1845 acl_ids->z_mode = zfs_mode_compute(acl_ids->z_mode,
1846 acl_ids->z_aclp, &acl_ids->z_aclp->z_hints,
1847 acl_ids->z_fuid, acl_ids->z_fgid);
1848 if (ace_trivial_common(acl_ids->z_aclp, 0, zfs_ace_walk) == 0)
1849 acl_ids->z_aclp->z_hints |= ZFS_ACL_TRIVIAL;
1850 }
1851
1852 return (0);
1853 }
1854
1855 /*
1856 * Free ACL and fuid_infop, but not the acl_ids structure
1857 */
1858 void
1859 zfs_acl_ids_free(zfs_acl_ids_t *acl_ids)
1860 {
1861 if (acl_ids->z_aclp)
1862 zfs_acl_free(acl_ids->z_aclp);
1863 if (acl_ids->z_fuidp)
1864 zfs_fuid_info_free(acl_ids->z_fuidp);
1865 acl_ids->z_aclp = NULL;
1866 acl_ids->z_fuidp = NULL;
1867 }
1868
1869 boolean_t
1870 zfs_acl_ids_overquota(zfs_sb_t *zsb, zfs_acl_ids_t *acl_ids)
1871 {
1872 return (zfs_fuid_overquota(zsb, B_FALSE, acl_ids->z_fuid) ||
1873 zfs_fuid_overquota(zsb, B_TRUE, acl_ids->z_fgid));
1874 }
1875
1876 /*
1877 * Retrieve a file's ACL
1878 */
1879 int
1880 zfs_getacl(znode_t *zp, vsecattr_t *vsecp, boolean_t skipaclchk, cred_t *cr)
1881 {
1882 zfs_acl_t *aclp;
1883 ulong_t mask;
1884 int error;
1885 int count = 0;
1886 int largeace = 0;
1887
1888 mask = vsecp->vsa_mask & (VSA_ACE | VSA_ACECNT |
1889 VSA_ACE_ACLFLAGS | VSA_ACE_ALLTYPES);
1890
1891 if (mask == 0)
1892 return (SET_ERROR(ENOSYS));
1893
1894 if ((error = zfs_zaccess(zp, ACE_READ_ACL, 0, skipaclchk, cr)))
1895 return (error);
1896
1897 mutex_enter(&zp->z_acl_lock);
1898
1899 error = zfs_acl_node_read(zp, B_FALSE, &aclp, B_FALSE);
1900 if (error != 0) {
1901 mutex_exit(&zp->z_acl_lock);
1902 return (error);
1903 }
1904
1905 /*
1906 * Scan ACL to determine number of ACEs
1907 */
1908 if ((zp->z_pflags & ZFS_ACL_OBJ_ACE) && !(mask & VSA_ACE_ALLTYPES)) {
1909 void *zacep = NULL;
1910 uint64_t who;
1911 uint32_t access_mask;
1912 uint16_t type, iflags;
1913
1914 while ((zacep = zfs_acl_next_ace(aclp, zacep,
1915 &who, &access_mask, &iflags, &type))) {
1916 switch (type) {
1917 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
1918 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
1919 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
1920 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
1921 largeace++;
1922 continue;
1923 default:
1924 count++;
1925 }
1926 }
1927 vsecp->vsa_aclcnt = count;
1928 } else
1929 count = (int)aclp->z_acl_count;
1930
1931 if (mask & VSA_ACECNT) {
1932 vsecp->vsa_aclcnt = count;
1933 }
1934
1935 if (mask & VSA_ACE) {
1936 size_t aclsz;
1937
1938 aclsz = count * sizeof (ace_t) +
1939 sizeof (ace_object_t) * largeace;
1940
1941 vsecp->vsa_aclentp = kmem_alloc(aclsz, KM_SLEEP);
1942 vsecp->vsa_aclentsz = aclsz;
1943
1944 if (aclp->z_version == ZFS_ACL_VERSION_FUID)
1945 zfs_copy_fuid_2_ace(ZTOZSB(zp), aclp, cr,
1946 vsecp->vsa_aclentp, !(mask & VSA_ACE_ALLTYPES));
1947 else {
1948 zfs_acl_node_t *aclnode;
1949 void *start = vsecp->vsa_aclentp;
1950
1951 for (aclnode = list_head(&aclp->z_acl); aclnode;
1952 aclnode = list_next(&aclp->z_acl, aclnode)) {
1953 bcopy(aclnode->z_acldata, start,
1954 aclnode->z_size);
1955 start = (caddr_t)start + aclnode->z_size;
1956 }
1957 ASSERT((caddr_t)start - (caddr_t)vsecp->vsa_aclentp ==
1958 aclp->z_acl_bytes);
1959 }
1960 }
1961 if (mask & VSA_ACE_ACLFLAGS) {
1962 vsecp->vsa_aclflags = 0;
1963 if (zp->z_pflags & ZFS_ACL_DEFAULTED)
1964 vsecp->vsa_aclflags |= ACL_DEFAULTED;
1965 if (zp->z_pflags & ZFS_ACL_PROTECTED)
1966 vsecp->vsa_aclflags |= ACL_PROTECTED;
1967 if (zp->z_pflags & ZFS_ACL_AUTO_INHERIT)
1968 vsecp->vsa_aclflags |= ACL_AUTO_INHERIT;
1969 }
1970
1971 mutex_exit(&zp->z_acl_lock);
1972
1973 return (0);
1974 }
1975
1976 int
1977 zfs_vsec_2_aclp(zfs_sb_t *zsb, umode_t obj_mode,
1978 vsecattr_t *vsecp, cred_t *cr, zfs_fuid_info_t **fuidp, zfs_acl_t **zaclp)
1979 {
1980 zfs_acl_t *aclp;
1981 zfs_acl_node_t *aclnode;
1982 int aclcnt = vsecp->vsa_aclcnt;
1983 int error;
1984
1985 if (vsecp->vsa_aclcnt > MAX_ACL_ENTRIES || vsecp->vsa_aclcnt <= 0)
1986 return (SET_ERROR(EINVAL));
1987
1988 aclp = zfs_acl_alloc(zfs_acl_version(zsb->z_version));
1989
1990 aclp->z_hints = 0;
1991 aclnode = zfs_acl_node_alloc(aclcnt * sizeof (zfs_object_ace_t));
1992 if (aclp->z_version == ZFS_ACL_VERSION_INITIAL) {
1993 if ((error = zfs_copy_ace_2_oldace(obj_mode, aclp,
1994 (ace_t *)vsecp->vsa_aclentp, aclnode->z_acldata,
1995 aclcnt, &aclnode->z_size)) != 0) {
1996 zfs_acl_free(aclp);
1997 zfs_acl_node_free(aclnode);
1998 return (error);
1999 }
2000 } else {
2001 if ((error = zfs_copy_ace_2_fuid(zsb, obj_mode, aclp,
2002 vsecp->vsa_aclentp, aclnode->z_acldata, aclcnt,
2003 &aclnode->z_size, fuidp, cr)) != 0) {
2004 zfs_acl_free(aclp);
2005 zfs_acl_node_free(aclnode);
2006 return (error);
2007 }
2008 }
2009 aclp->z_acl_bytes = aclnode->z_size;
2010 aclnode->z_ace_count = aclcnt;
2011 aclp->z_acl_count = aclcnt;
2012 list_insert_head(&aclp->z_acl, aclnode);
2013
2014 /*
2015 * If flags are being set then add them to z_hints
2016 */
2017 if (vsecp->vsa_mask & VSA_ACE_ACLFLAGS) {
2018 if (vsecp->vsa_aclflags & ACL_PROTECTED)
2019 aclp->z_hints |= ZFS_ACL_PROTECTED;
2020 if (vsecp->vsa_aclflags & ACL_DEFAULTED)
2021 aclp->z_hints |= ZFS_ACL_DEFAULTED;
2022 if (vsecp->vsa_aclflags & ACL_AUTO_INHERIT)
2023 aclp->z_hints |= ZFS_ACL_AUTO_INHERIT;
2024 }
2025
2026 *zaclp = aclp;
2027
2028 return (0);
2029 }
2030
2031 /*
2032 * Set a file's ACL
2033 */
2034 int
2035 zfs_setacl(znode_t *zp, vsecattr_t *vsecp, boolean_t skipaclchk, cred_t *cr)
2036 {
2037 zfs_sb_t *zsb = ZTOZSB(zp);
2038 zilog_t *zilog = zsb->z_log;
2039 ulong_t mask = vsecp->vsa_mask & (VSA_ACE | VSA_ACECNT);
2040 dmu_tx_t *tx;
2041 int error;
2042 zfs_acl_t *aclp;
2043 zfs_fuid_info_t *fuidp = NULL;
2044 boolean_t fuid_dirtied;
2045 uint64_t acl_obj;
2046
2047 if (mask == 0)
2048 return (SET_ERROR(ENOSYS));
2049
2050 if (zp->z_pflags & ZFS_IMMUTABLE)
2051 return (SET_ERROR(EPERM));
2052
2053 if ((error = zfs_zaccess(zp, ACE_WRITE_ACL, 0, skipaclchk, cr)))
2054 return (error);
2055
2056 error = zfs_vsec_2_aclp(zsb, ZTOI(zp)->i_mode, vsecp, cr, &fuidp,
2057 &aclp);
2058 if (error)
2059 return (error);
2060
2061 /*
2062 * If ACL wide flags aren't being set then preserve any
2063 * existing flags.
2064 */
2065 if (!(vsecp->vsa_mask & VSA_ACE_ACLFLAGS)) {
2066 aclp->z_hints |=
2067 (zp->z_pflags & V4_ACL_WIDE_FLAGS);
2068 }
2069 top:
2070 mutex_enter(&zp->z_acl_lock);
2071 mutex_enter(&zp->z_lock);
2072
2073 tx = dmu_tx_create(zsb->z_os);
2074
2075 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE);
2076
2077 fuid_dirtied = zsb->z_fuid_dirty;
2078 if (fuid_dirtied)
2079 zfs_fuid_txhold(zsb, tx);
2080
2081 /*
2082 * If old version and ACL won't fit in bonus and we aren't
2083 * upgrading then take out necessary DMU holds
2084 */
2085
2086 if ((acl_obj = zfs_external_acl(zp)) != 0) {
2087 if (zsb->z_version >= ZPL_VERSION_FUID &&
2088 zfs_znode_acl_version(zp) <= ZFS_ACL_VERSION_INITIAL) {
2089 dmu_tx_hold_free(tx, acl_obj, 0,
2090 DMU_OBJECT_END);
2091 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0,
2092 aclp->z_acl_bytes);
2093 } else {
2094 dmu_tx_hold_write(tx, acl_obj, 0, aclp->z_acl_bytes);
2095 }
2096 } else if (!zp->z_is_sa && aclp->z_acl_bytes > ZFS_ACE_SPACE) {
2097 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, aclp->z_acl_bytes);
2098 }
2099
2100 zfs_sa_upgrade_txholds(tx, zp);
2101 error = dmu_tx_assign(tx, TXG_NOWAIT);
2102 if (error) {
2103 mutex_exit(&zp->z_acl_lock);
2104 mutex_exit(&zp->z_lock);
2105
2106 if (error == ERESTART) {
2107 dmu_tx_wait(tx);
2108 dmu_tx_abort(tx);
2109 goto top;
2110 }
2111 dmu_tx_abort(tx);
2112 zfs_acl_free(aclp);
2113 return (error);
2114 }
2115
2116 error = zfs_aclset_common(zp, aclp, cr, tx);
2117 ASSERT(error == 0);
2118 ASSERT(zp->z_acl_cached == NULL);
2119 zp->z_acl_cached = aclp;
2120
2121 if (fuid_dirtied)
2122 zfs_fuid_sync(zsb, tx);
2123
2124 zfs_log_acl(zilog, tx, zp, vsecp, fuidp);
2125
2126 if (fuidp)
2127 zfs_fuid_info_free(fuidp);
2128 dmu_tx_commit(tx);
2129
2130 mutex_exit(&zp->z_lock);
2131 mutex_exit(&zp->z_acl_lock);
2132
2133 return (error);
2134 }
2135
2136 /*
2137 * Check accesses of interest (AoI) against attributes of the dataset
2138 * such as read-only. Returns zero if no AoI conflict with dataset
2139 * attributes, otherwise an appropriate errno is returned.
2140 */
2141 static int
2142 zfs_zaccess_dataset_check(znode_t *zp, uint32_t v4_mode)
2143 {
2144 if ((v4_mode & WRITE_MASK) && (zfs_is_readonly(ZTOZSB(zp))) &&
2145 (!S_ISDEV(ZTOI(zp)->i_mode) ||
2146 (S_ISDEV(ZTOI(zp)->i_mode) && (v4_mode & WRITE_MASK_ATTRS)))) {
2147 return (SET_ERROR(EROFS));
2148 }
2149
2150 /*
2151 * Only check for READONLY on non-directories.
2152 */
2153 if ((v4_mode & WRITE_MASK_DATA) &&
2154 ((!S_ISDIR(ZTOI(zp)->i_mode) &&
2155 (zp->z_pflags & (ZFS_READONLY | ZFS_IMMUTABLE))) ||
2156 (S_ISDIR(ZTOI(zp)->i_mode) &&
2157 (zp->z_pflags & ZFS_IMMUTABLE)))) {
2158 return (SET_ERROR(EPERM));
2159 }
2160
2161 if ((v4_mode & (ACE_DELETE | ACE_DELETE_CHILD)) &&
2162 (zp->z_pflags & ZFS_NOUNLINK)) {
2163 return (SET_ERROR(EPERM));
2164 }
2165
2166 if (((v4_mode & (ACE_READ_DATA|ACE_EXECUTE)) &&
2167 (zp->z_pflags & ZFS_AV_QUARANTINED))) {
2168 return (SET_ERROR(EACCES));
2169 }
2170
2171 return (0);
2172 }
2173
2174 /*
2175 * The primary usage of this function is to loop through all of the
2176 * ACEs in the znode, determining what accesses of interest (AoI) to
2177 * the caller are allowed or denied. The AoI are expressed as bits in
2178 * the working_mode parameter. As each ACE is processed, bits covered
2179 * by that ACE are removed from the working_mode. This removal
2180 * facilitates two things. The first is that when the working mode is
2181 * empty (= 0), we know we've looked at all the AoI. The second is
2182 * that the ACE interpretation rules don't allow a later ACE to undo
2183 * something granted or denied by an earlier ACE. Removing the
2184 * discovered access or denial enforces this rule. At the end of
2185 * processing the ACEs, all AoI that were found to be denied are
2186 * placed into the working_mode, giving the caller a mask of denied
2187 * accesses. Returns:
2188 * 0 if all AoI granted
2189 * EACCESS if the denied mask is non-zero
2190 * other error if abnormal failure (e.g., IO error)
2191 *
2192 * A secondary usage of the function is to determine if any of the
2193 * AoI are granted. If an ACE grants any access in
2194 * the working_mode, we immediately short circuit out of the function.
2195 * This mode is chosen by setting anyaccess to B_TRUE. The
2196 * working_mode is not a denied access mask upon exit if the function
2197 * is used in this manner.
2198 */
2199 static int
2200 zfs_zaccess_aces_check(znode_t *zp, uint32_t *working_mode,
2201 boolean_t anyaccess, cred_t *cr)
2202 {
2203 zfs_sb_t *zsb = ZTOZSB(zp);
2204 zfs_acl_t *aclp;
2205 int error;
2206 uid_t uid = crgetuid(cr);
2207 uint64_t who;
2208 uint16_t type, iflags;
2209 uint16_t entry_type;
2210 uint32_t access_mask;
2211 uint32_t deny_mask = 0;
2212 zfs_ace_hdr_t *acep = NULL;
2213 boolean_t checkit;
2214 uid_t gowner;
2215 uid_t fowner;
2216
2217 zfs_fuid_map_ids(zp, cr, &fowner, &gowner);
2218
2219 mutex_enter(&zp->z_acl_lock);
2220
2221 error = zfs_acl_node_read(zp, B_FALSE, &aclp, B_FALSE);
2222 if (error != 0) {
2223 mutex_exit(&zp->z_acl_lock);
2224 return (error);
2225 }
2226
2227 ASSERT(zp->z_acl_cached);
2228
2229 while ((acep = zfs_acl_next_ace(aclp, acep, &who, &access_mask,
2230 &iflags, &type))) {
2231 uint32_t mask_matched;
2232
2233 if (!zfs_acl_valid_ace_type(type, iflags))
2234 continue;
2235
2236 if (S_ISDIR(ZTOI(zp)->i_mode) &&
2237 (iflags & ACE_INHERIT_ONLY_ACE))
2238 continue;
2239
2240 /* Skip ACE if it does not affect any AoI */
2241 mask_matched = (access_mask & *working_mode);
2242 if (!mask_matched)
2243 continue;
2244
2245 entry_type = (iflags & ACE_TYPE_FLAGS);
2246
2247 checkit = B_FALSE;
2248
2249 switch (entry_type) {
2250 case ACE_OWNER:
2251 if (uid == fowner)
2252 checkit = B_TRUE;
2253 break;
2254 case OWNING_GROUP:
2255 who = gowner;
2256 /*FALLTHROUGH*/
2257 case ACE_IDENTIFIER_GROUP:
2258 checkit = zfs_groupmember(zsb, who, cr);
2259 break;
2260 case ACE_EVERYONE:
2261 checkit = B_TRUE;
2262 break;
2263
2264 /* USER Entry */
2265 default:
2266 if (entry_type == 0) {
2267 uid_t newid;
2268
2269 newid = zfs_fuid_map_id(zsb, who, cr,
2270 ZFS_ACE_USER);
2271 if (newid != IDMAP_WK_CREATOR_OWNER_UID &&
2272 uid == newid)
2273 checkit = B_TRUE;
2274 break;
2275 } else {
2276 mutex_exit(&zp->z_acl_lock);
2277 return (SET_ERROR(EIO));
2278 }
2279 }
2280
2281 if (checkit) {
2282 if (type == DENY) {
2283 DTRACE_PROBE3(zfs__ace__denies,
2284 znode_t *, zp,
2285 zfs_ace_hdr_t *, acep,
2286 uint32_t, mask_matched);
2287 deny_mask |= mask_matched;
2288 } else {
2289 DTRACE_PROBE3(zfs__ace__allows,
2290 znode_t *, zp,
2291 zfs_ace_hdr_t *, acep,
2292 uint32_t, mask_matched);
2293 if (anyaccess) {
2294 mutex_exit(&zp->z_acl_lock);
2295 return (0);
2296 }
2297 }
2298 *working_mode &= ~mask_matched;
2299 }
2300
2301 /* Are we done? */
2302 if (*working_mode == 0)
2303 break;
2304 }
2305
2306 mutex_exit(&zp->z_acl_lock);
2307
2308 /* Put the found 'denies' back on the working mode */
2309 if (deny_mask) {
2310 *working_mode |= deny_mask;
2311 return (SET_ERROR(EACCES));
2312 } else if (*working_mode) {
2313 return (-1);
2314 }
2315
2316 return (0);
2317 }
2318
2319 /*
2320 * Return true if any access whatsoever granted, we don't actually
2321 * care what access is granted.
2322 */
2323 boolean_t
2324 zfs_has_access(znode_t *zp, cred_t *cr)
2325 {
2326 uint32_t have = ACE_ALL_PERMS;
2327
2328 if (zfs_zaccess_aces_check(zp, &have, B_TRUE, cr) != 0) {
2329 uid_t owner;
2330
2331 owner = zfs_fuid_map_id(ZTOZSB(zp), zp->z_uid, cr, ZFS_OWNER);
2332 return (secpolicy_vnode_any_access(cr, ZTOI(zp), owner) == 0);
2333 }
2334 return (B_TRUE);
2335 }
2336
2337 static int
2338 zfs_zaccess_common(znode_t *zp, uint32_t v4_mode, uint32_t *working_mode,
2339 boolean_t *check_privs, boolean_t skipaclchk, cred_t *cr)
2340 {
2341 zfs_sb_t *zsb = ZTOZSB(zp);
2342 int err;
2343
2344 *working_mode = v4_mode;
2345 *check_privs = B_TRUE;
2346
2347 /*
2348 * Short circuit empty requests
2349 */
2350 if (v4_mode == 0 || zsb->z_replay) {
2351 *working_mode = 0;
2352 return (0);
2353 }
2354
2355 if ((err = zfs_zaccess_dataset_check(zp, v4_mode)) != 0) {
2356 *check_privs = B_FALSE;
2357 return (err);
2358 }
2359
2360 /*
2361 * The caller requested that the ACL check be skipped. This
2362 * would only happen if the caller checked VOP_ACCESS() with a
2363 * 32 bit ACE mask and already had the appropriate permissions.
2364 */
2365 if (skipaclchk) {
2366 *working_mode = 0;
2367 return (0);
2368 }
2369
2370 return (zfs_zaccess_aces_check(zp, working_mode, B_FALSE, cr));
2371 }
2372
2373 static int
2374 zfs_zaccess_append(znode_t *zp, uint32_t *working_mode, boolean_t *check_privs,
2375 cred_t *cr)
2376 {
2377 if (*working_mode != ACE_WRITE_DATA)
2378 return (SET_ERROR(EACCES));
2379
2380 return (zfs_zaccess_common(zp, ACE_APPEND_DATA, working_mode,
2381 check_privs, B_FALSE, cr));
2382 }
2383
2384 int
2385 zfs_fastaccesschk_execute(znode_t *zdp, cred_t *cr)
2386 {
2387 boolean_t owner = B_FALSE;
2388 boolean_t groupmbr = B_FALSE;
2389 boolean_t is_attr;
2390 uid_t uid = crgetuid(cr);
2391 int error;
2392
2393 if (zdp->z_pflags & ZFS_AV_QUARANTINED)
2394 return (SET_ERROR(EACCES));
2395
2396 is_attr = ((zdp->z_pflags & ZFS_XATTR) &&
2397 (S_ISDIR(ZTOI(zdp)->i_mode)));
2398 if (is_attr)
2399 goto slow;
2400
2401
2402 mutex_enter(&zdp->z_acl_lock);
2403
2404 if (zdp->z_pflags & ZFS_NO_EXECS_DENIED) {
2405 mutex_exit(&zdp->z_acl_lock);
2406 return (0);
2407 }
2408
2409 if (FUID_INDEX(zdp->z_uid) != 0 || FUID_INDEX(zdp->z_gid) != 0) {
2410 mutex_exit(&zdp->z_acl_lock);
2411 goto slow;
2412 }
2413
2414 if (uid == zdp->z_uid) {
2415 owner = B_TRUE;
2416 if (zdp->z_mode & S_IXUSR) {
2417 mutex_exit(&zdp->z_acl_lock);
2418 return (0);
2419 } else {
2420 mutex_exit(&zdp->z_acl_lock);
2421 goto slow;
2422 }
2423 }
2424 if (groupmember(zdp->z_gid, cr)) {
2425 groupmbr = B_TRUE;
2426 if (zdp->z_mode & S_IXGRP) {
2427 mutex_exit(&zdp->z_acl_lock);
2428 return (0);
2429 } else {
2430 mutex_exit(&zdp->z_acl_lock);
2431 goto slow;
2432 }
2433 }
2434 if (!owner && !groupmbr) {
2435 if (zdp->z_mode & S_IXOTH) {
2436 mutex_exit(&zdp->z_acl_lock);
2437 return (0);
2438 }
2439 }
2440
2441 mutex_exit(&zdp->z_acl_lock);
2442
2443 slow:
2444 DTRACE_PROBE(zfs__fastpath__execute__access__miss);
2445 ZFS_ENTER(ZTOZSB(zdp));
2446 error = zfs_zaccess(zdp, ACE_EXECUTE, 0, B_FALSE, cr);
2447 ZFS_EXIT(ZTOZSB(zdp));
2448 return (error);
2449 }
2450
2451 /*
2452 * Determine whether Access should be granted/denied.
2453 *
2454 * The least priv subsytem is always consulted as a basic privilege
2455 * can define any form of access.
2456 */
2457 int
2458 zfs_zaccess(znode_t *zp, int mode, int flags, boolean_t skipaclchk, cred_t *cr)
2459 {
2460 uint32_t working_mode;
2461 int error;
2462 boolean_t check_privs;
2463 znode_t *check_zp = zp;
2464 mode_t needed_bits;
2465 uid_t owner;
2466
2467 /*
2468 * If attribute then validate against base file
2469 */
2470 if ((zp->z_pflags & ZFS_XATTR) && S_ISDIR(ZTOI(zp)->i_mode)) {
2471 uint64_t parent;
2472
2473 rw_enter(&zp->z_xattr_lock, RW_READER);
2474 if (zp->z_xattr_parent) {
2475 check_zp = zp->z_xattr_parent;
2476 rw_exit(&zp->z_xattr_lock);
2477
2478 /*
2479 * Verify a lookup yields the same znode.
2480 */
2481 ASSERT3S(sa_lookup(zp->z_sa_hdl, SA_ZPL_PARENT(
2482 ZTOZSB(zp)), &parent, sizeof (parent)), ==, 0);
2483 ASSERT3U(check_zp->z_id, ==, parent);
2484 } else {
2485 rw_exit(&zp->z_xattr_lock);
2486
2487 error = sa_lookup(zp->z_sa_hdl, SA_ZPL_PARENT(
2488 ZTOZSB(zp)), &parent, sizeof (parent));
2489 if (error)
2490 return (error);
2491
2492 /*
2493 * Cache the lookup on the parent file znode as
2494 * zp->z_xattr_parent and hold a reference. This
2495 * effectively pins the parent in memory until all
2496 * child xattr znodes have been destroyed and
2497 * release their references in zfs_inode_destroy().
2498 */
2499 error = zfs_zget(ZTOZSB(zp), parent, &check_zp);
2500 if (error)
2501 return (error);
2502
2503 rw_enter(&zp->z_xattr_lock, RW_WRITER);
2504 if (zp->z_xattr_parent == NULL)
2505 zp->z_xattr_parent = check_zp;
2506 rw_exit(&zp->z_xattr_lock);
2507 }
2508
2509 /*
2510 * fixup mode to map to xattr perms
2511 */
2512
2513 if (mode & (ACE_WRITE_DATA|ACE_APPEND_DATA)) {
2514 mode &= ~(ACE_WRITE_DATA|ACE_APPEND_DATA);
2515 mode |= ACE_WRITE_NAMED_ATTRS;
2516 }
2517
2518 if (mode & (ACE_READ_DATA|ACE_EXECUTE)) {
2519 mode &= ~(ACE_READ_DATA|ACE_EXECUTE);
2520 mode |= ACE_READ_NAMED_ATTRS;
2521 }
2522 }
2523
2524 owner = zfs_fuid_map_id(ZTOZSB(zp), zp->z_uid, cr, ZFS_OWNER);
2525 /*
2526 * Map the bits required to the standard inode flags
2527 * S_IRUSR|S_IWUSR|S_IXUSR in the needed_bits. Map the bits
2528 * mapped by working_mode (currently missing) in missing_bits.
2529 * Call secpolicy_vnode_access2() with (needed_bits & ~checkmode),
2530 * needed_bits.
2531 */
2532 needed_bits = 0;
2533
2534 working_mode = mode;
2535 if ((working_mode & (ACE_READ_ACL|ACE_READ_ATTRIBUTES)) &&
2536 owner == crgetuid(cr))
2537 working_mode &= ~(ACE_READ_ACL|ACE_READ_ATTRIBUTES);
2538
2539 if (working_mode & (ACE_READ_DATA|ACE_READ_NAMED_ATTRS|
2540 ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_SYNCHRONIZE))
2541 needed_bits |= S_IRUSR;
2542 if (working_mode & (ACE_WRITE_DATA|ACE_WRITE_NAMED_ATTRS|
2543 ACE_APPEND_DATA|ACE_WRITE_ATTRIBUTES|ACE_SYNCHRONIZE))
2544 needed_bits |= S_IWUSR;
2545 if (working_mode & ACE_EXECUTE)
2546 needed_bits |= S_IXUSR;
2547
2548 if ((error = zfs_zaccess_common(check_zp, mode, &working_mode,
2549 &check_privs, skipaclchk, cr)) == 0) {
2550 return (secpolicy_vnode_access2(cr, ZTOI(zp), owner,
2551 needed_bits, needed_bits));
2552 }
2553
2554 if (error && !check_privs) {
2555 return (error);
2556 }
2557
2558 if (error && (flags & V_APPEND)) {
2559 error = zfs_zaccess_append(zp, &working_mode, &check_privs, cr);
2560 }
2561
2562 if (error && check_privs) {
2563 mode_t checkmode = 0;
2564
2565 /*
2566 * First check for implicit owner permission on
2567 * read_acl/read_attributes
2568 */
2569
2570 error = 0;
2571 ASSERT(working_mode != 0);
2572
2573 if ((working_mode & (ACE_READ_ACL|ACE_READ_ATTRIBUTES) &&
2574 owner == crgetuid(cr)))
2575 working_mode &= ~(ACE_READ_ACL|ACE_READ_ATTRIBUTES);
2576
2577 if (working_mode & (ACE_READ_DATA|ACE_READ_NAMED_ATTRS|
2578 ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_SYNCHRONIZE))
2579 checkmode |= S_IRUSR;
2580 if (working_mode & (ACE_WRITE_DATA|ACE_WRITE_NAMED_ATTRS|
2581 ACE_APPEND_DATA|ACE_WRITE_ATTRIBUTES|ACE_SYNCHRONIZE))
2582 checkmode |= S_IWUSR;
2583 if (working_mode & ACE_EXECUTE)
2584 checkmode |= S_IXUSR;
2585
2586 error = secpolicy_vnode_access2(cr, ZTOI(check_zp), owner,
2587 needed_bits & ~checkmode, needed_bits);
2588
2589 if (error == 0 && (working_mode & ACE_WRITE_OWNER))
2590 error = secpolicy_vnode_chown(cr, owner);
2591 if (error == 0 && (working_mode & ACE_WRITE_ACL))
2592 error = secpolicy_vnode_setdac(cr, owner);
2593
2594 if (error == 0 && (working_mode &
2595 (ACE_DELETE|ACE_DELETE_CHILD)))
2596 error = secpolicy_vnode_remove(cr);
2597
2598 if (error == 0 && (working_mode & ACE_SYNCHRONIZE)) {
2599 error = secpolicy_vnode_chown(cr, owner);
2600 }
2601 if (error == 0) {
2602 /*
2603 * See if any bits other than those already checked
2604 * for are still present. If so then return EACCES
2605 */
2606 if (working_mode & ~(ZFS_CHECKED_MASKS)) {
2607 error = SET_ERROR(EACCES);
2608 }
2609 }
2610 } else if (error == 0) {
2611 error = secpolicy_vnode_access2(cr, ZTOI(zp), owner,
2612 needed_bits, needed_bits);
2613 }
2614
2615 return (error);
2616 }
2617
2618 /*
2619 * Translate traditional unix S_IRUSR/S_IWUSR/S_IXUSR mode into
2620 * native ACL format and call zfs_zaccess()
2621 */
2622 int
2623 zfs_zaccess_rwx(znode_t *zp, mode_t mode, int flags, cred_t *cr)
2624 {
2625 return (zfs_zaccess(zp, zfs_unix_to_v4(mode >> 6), flags, B_FALSE, cr));
2626 }
2627
2628 /*
2629 * Access function for secpolicy_vnode_setattr
2630 */
2631 int
2632 zfs_zaccess_unix(znode_t *zp, mode_t mode, cred_t *cr)
2633 {
2634 int v4_mode = zfs_unix_to_v4(mode >> 6);
2635
2636 return (zfs_zaccess(zp, v4_mode, 0, B_FALSE, cr));
2637 }
2638
2639 static int
2640 zfs_delete_final_check(znode_t *zp, znode_t *dzp,
2641 mode_t available_perms, cred_t *cr)
2642 {
2643 int error;
2644 uid_t downer;
2645
2646 downer = zfs_fuid_map_id(ZTOZSB(dzp), dzp->z_uid, cr, ZFS_OWNER);
2647
2648 error = secpolicy_vnode_access2(cr, ZTOI(dzp),
2649 downer, available_perms, S_IWUSR|S_IXUSR);
2650
2651 if (error == 0)
2652 error = zfs_sticky_remove_access(dzp, zp, cr);
2653
2654 return (error);
2655 }
2656
2657 /*
2658 * Determine whether Access should be granted/deny, without
2659 * consulting least priv subsystem.
2660 *
2661 * The following chart is the recommended NFSv4 enforcement for
2662 * ability to delete an object.
2663 *
2664 * -------------------------------------------------------
2665 * | Parent Dir | Target Object Permissions |
2666 * | permissions | |
2667 * -------------------------------------------------------
2668 * | | ACL Allows | ACL Denies| Delete |
2669 * | | Delete | Delete | unspecified|
2670 * -------------------------------------------------------
2671 * | ACL Allows | Permit | Permit | Permit |
2672 * | DELETE_CHILD | |
2673 * -------------------------------------------------------
2674 * | ACL Denies | Permit | Deny | Deny |
2675 * | DELETE_CHILD | | | |
2676 * -------------------------------------------------------
2677 * | ACL specifies | | | |
2678 * | only allow | Permit | Permit | Permit |
2679 * | write and | | | |
2680 * | execute | | | |
2681 * -------------------------------------------------------
2682 * | ACL denies | | | |
2683 * | write and | Permit | Deny | Deny |
2684 * | execute | | | |
2685 * -------------------------------------------------------
2686 * ^
2687 * |
2688 * No search privilege, can't even look up file?
2689 *
2690 */
2691 int
2692 zfs_zaccess_delete(znode_t *dzp, znode_t *zp, cred_t *cr)
2693 {
2694 uint32_t dzp_working_mode = 0;
2695 uint32_t zp_working_mode = 0;
2696 int dzp_error, zp_error;
2697 mode_t available_perms;
2698 boolean_t dzpcheck_privs = B_TRUE;
2699 boolean_t zpcheck_privs = B_TRUE;
2700
2701 /*
2702 * We want specific DELETE permissions to
2703 * take precedence over WRITE/EXECUTE. We don't
2704 * want an ACL such as this to mess us up.
2705 * user:joe:write_data:deny,user:joe:delete:allow
2706 *
2707 * However, deny permissions may ultimately be overridden
2708 * by secpolicy_vnode_access().
2709 *
2710 * We will ask for all of the necessary permissions and then
2711 * look at the working modes from the directory and target object
2712 * to determine what was found.
2713 */
2714
2715 if (zp->z_pflags & (ZFS_IMMUTABLE | ZFS_NOUNLINK))
2716 return (SET_ERROR(EPERM));
2717
2718 /*
2719 * First row
2720 * If the directory permissions allow the delete, we are done.
2721 */
2722 if ((dzp_error = zfs_zaccess_common(dzp, ACE_DELETE_CHILD,
2723 &dzp_working_mode, &dzpcheck_privs, B_FALSE, cr)) == 0)
2724 return (0);
2725
2726 /*
2727 * If target object has delete permission then we are done
2728 */
2729 if ((zp_error = zfs_zaccess_common(zp, ACE_DELETE, &zp_working_mode,
2730 &zpcheck_privs, B_FALSE, cr)) == 0)
2731 return (0);
2732
2733 ASSERT(dzp_error && zp_error);
2734
2735 if (!dzpcheck_privs)
2736 return (dzp_error);
2737 if (!zpcheck_privs)
2738 return (zp_error);
2739
2740 /*
2741 * Second row
2742 *
2743 * If directory returns EACCES then delete_child was denied
2744 * due to deny delete_child. In this case send the request through
2745 * secpolicy_vnode_remove(). We don't use zfs_delete_final_check()
2746 * since that *could* allow the delete based on write/execute permission
2747 * and we want delete permissions to override write/execute.
2748 */
2749
2750 if (dzp_error == EACCES)
2751 return (secpolicy_vnode_remove(cr));
2752
2753 /*
2754 * Third Row
2755 * only need to see if we have write/execute on directory.
2756 */
2757
2758 dzp_error = zfs_zaccess_common(dzp, ACE_EXECUTE|ACE_WRITE_DATA,
2759 &dzp_working_mode, &dzpcheck_privs, B_FALSE, cr);
2760
2761 if (dzp_error != 0 && !dzpcheck_privs)
2762 return (dzp_error);
2763
2764 /*
2765 * Fourth row
2766 */
2767
2768 available_perms = (dzp_working_mode & ACE_WRITE_DATA) ? 0 : S_IWUSR;
2769 available_perms |= (dzp_working_mode & ACE_EXECUTE) ? 0 : S_IXUSR;
2770
2771 return (zfs_delete_final_check(zp, dzp, available_perms, cr));
2772
2773 }
2774
2775 int
2776 zfs_zaccess_rename(znode_t *sdzp, znode_t *szp, znode_t *tdzp,
2777 znode_t *tzp, cred_t *cr)
2778 {
2779 int add_perm;
2780 int error;
2781
2782 if (szp->z_pflags & ZFS_AV_QUARANTINED)
2783 return (SET_ERROR(EACCES));
2784
2785 add_perm = S_ISDIR(ZTOI(szp)->i_mode) ?
2786 ACE_ADD_SUBDIRECTORY : ACE_ADD_FILE;
2787
2788 /*
2789 * Rename permissions are combination of delete permission +
2790 * add file/subdir permission.
2791 */
2792
2793 /*
2794 * first make sure we do the delete portion.
2795 *
2796 * If that succeeds then check for add_file/add_subdir permissions
2797 */
2798
2799 if ((error = zfs_zaccess_delete(sdzp, szp, cr)))
2800 return (error);
2801
2802 /*
2803 * If we have a tzp, see if we can delete it?
2804 */
2805 if (tzp) {
2806 if ((error = zfs_zaccess_delete(tdzp, tzp, cr)))
2807 return (error);
2808 }
2809
2810 /*
2811 * Now check for add permissions
2812 */
2813 error = zfs_zaccess(tdzp, add_perm, 0, B_FALSE, cr);
2814
2815 return (error);
2816 }
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