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Merge commit '0b905b49d460a57773d88d714cd880ffe0182b7c'
[unleashed.git] / usr / src / common / acl / acl_common.c
blob6fa4c9249d3189cc7a517f7b1997ebffb196e733
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 2014 Nexenta Systems, Inc. All rights reserved.
24 */
25
26 #include <sys/types.h>
27 #include <sys/stat.h>
28 #include <sys/errno.h>
29 #include <sys/avl.h>
30 #if defined(_KERNEL)
31 #include <sys/debug.h>
32 #include <sys/kmem.h>
33 #include <sys/systm.h>
34 #include <sys/sysmacros.h>
35 #include <acl/acl_common.h>
36 #else
37 #include <errno.h>
38 #include <stdlib.h>
39 #include <stddef.h>
40 #include <strings.h>
41 #include <unistd.h>
42 #include <assert.h>
43 #include <grp.h>
44 #include <pwd.h>
45 #include <acl_common.h>
46 #define ASSERT assert
47 #endif
48
49 #define ACE_POSIX_SUPPORTED_BITS (ACE_READ_DATA | \
50 ACE_WRITE_DATA | ACE_APPEND_DATA | ACE_EXECUTE | \
51 ACE_READ_ATTRIBUTES | ACE_READ_ACL | ACE_WRITE_ACL)
52
53
54 #define ACL_SYNCHRONIZE_SET_DENY 0x0000001
55 #define ACL_SYNCHRONIZE_SET_ALLOW 0x0000002
56 #define ACL_SYNCHRONIZE_ERR_DENY 0x0000004
57 #define ACL_SYNCHRONIZE_ERR_ALLOW 0x0000008
58
59 #define ACL_WRITE_OWNER_SET_DENY 0x0000010
60 #define ACL_WRITE_OWNER_SET_ALLOW 0x0000020
61 #define ACL_WRITE_OWNER_ERR_DENY 0x0000040
62 #define ACL_WRITE_OWNER_ERR_ALLOW 0x0000080
63
64 #define ACL_DELETE_SET_DENY 0x0000100
65 #define ACL_DELETE_SET_ALLOW 0x0000200
66 #define ACL_DELETE_ERR_DENY 0x0000400
67 #define ACL_DELETE_ERR_ALLOW 0x0000800
68
69 #define ACL_WRITE_ATTRS_OWNER_SET_DENY 0x0001000
70 #define ACL_WRITE_ATTRS_OWNER_SET_ALLOW 0x0002000
71 #define ACL_WRITE_ATTRS_OWNER_ERR_DENY 0x0004000
72 #define ACL_WRITE_ATTRS_OWNER_ERR_ALLOW 0x0008000
73
74 #define ACL_WRITE_ATTRS_WRITER_SET_DENY 0x0010000
75 #define ACL_WRITE_ATTRS_WRITER_SET_ALLOW 0x0020000
76 #define ACL_WRITE_ATTRS_WRITER_ERR_DENY 0x0040000
77 #define ACL_WRITE_ATTRS_WRITER_ERR_ALLOW 0x0080000
78
79 #define ACL_WRITE_NAMED_WRITER_SET_DENY 0x0100000
80 #define ACL_WRITE_NAMED_WRITER_SET_ALLOW 0x0200000
81 #define ACL_WRITE_NAMED_WRITER_ERR_DENY 0x0400000
82 #define ACL_WRITE_NAMED_WRITER_ERR_ALLOW 0x0800000
83
84 #define ACL_READ_NAMED_READER_SET_DENY 0x1000000
85 #define ACL_READ_NAMED_READER_SET_ALLOW 0x2000000
86 #define ACL_READ_NAMED_READER_ERR_DENY 0x4000000
87 #define ACL_READ_NAMED_READER_ERR_ALLOW 0x8000000
88
89
90 #define ACE_VALID_MASK_BITS (\
91 ACE_READ_DATA | \
92 ACE_LIST_DIRECTORY | \
93 ACE_WRITE_DATA | \
94 ACE_ADD_FILE | \
95 ACE_APPEND_DATA | \
96 ACE_ADD_SUBDIRECTORY | \
97 ACE_READ_NAMED_ATTRS | \
98 ACE_WRITE_NAMED_ATTRS | \
99 ACE_EXECUTE | \
100 ACE_DELETE_CHILD | \
101 ACE_READ_ATTRIBUTES | \
102 ACE_WRITE_ATTRIBUTES | \
103 ACE_DELETE | \
104 ACE_READ_ACL | \
105 ACE_WRITE_ACL | \
106 ACE_WRITE_OWNER | \
107 ACE_SYNCHRONIZE)
108
109 #define ACE_MASK_UNDEFINED 0x80000000
110
111 #define ACE_VALID_FLAG_BITS (ACE_FILE_INHERIT_ACE | \
112 ACE_DIRECTORY_INHERIT_ACE | \
113 ACE_NO_PROPAGATE_INHERIT_ACE | ACE_INHERIT_ONLY_ACE | \
114 ACE_SUCCESSFUL_ACCESS_ACE_FLAG | ACE_FAILED_ACCESS_ACE_FLAG | \
115 ACE_IDENTIFIER_GROUP | ACE_OWNER | ACE_GROUP | ACE_EVERYONE)
116
117 /*
118 * ACL conversion helpers
119 */
120
121 typedef enum {
122 ace_unused,
123 ace_user_obj,
124 ace_user,
125 ace_group, /* includes GROUP and GROUP_OBJ */
126 ace_other_obj
127 } ace_to_aent_state_t;
128
129 typedef struct acevals {
130 uid_t key;
131 avl_node_t avl;
132 uint32_t mask;
133 uint32_t allowed;
134 uint32_t denied;
135 int aent_type;
136 } acevals_t;
137
138 typedef struct ace_list {
139 acevals_t user_obj;
140 avl_tree_t user;
141 int numusers;
142 acevals_t group_obj;
143 avl_tree_t group;
144 int numgroups;
145 acevals_t other_obj;
146 uint32_t acl_mask;
147 int hasmask;
148 int dfacl_flag;
149 ace_to_aent_state_t state;
150 int seen; /* bitmask of all aclent_t a_type values seen */
151 } ace_list_t;
152
153 /*
154 * Generic shellsort, from K&R (1st ed, p 58.), somewhat modified.
155 * v = Ptr to array/vector of objs
156 * n = # objs in the array
157 * s = size of each obj (must be multiples of a word size)
158 * f = ptr to function to compare two objs
159 * returns (-1 = less than, 0 = equal, 1 = greater than
160 */
161 void
162 ksort(caddr_t v, int n, int s, int (*f)())
163 {
164 int g, i, j, ii;
165 unsigned int *p1, *p2;
166 unsigned int tmp;
167
168 /* No work to do */
169 if (v == NULL || n <= 1)
170 return;
171
172 /* Sanity check on arguments */
173 ASSERT(((uintptr_t)v & 0x3) == 0 && (s & 0x3) == 0);
174 ASSERT(s > 0);
175 for (g = n / 2; g > 0; g /= 2) {
176 for (i = g; i < n; i++) {
177 for (j = i - g; j >= 0 &&
178 (*f)(v + j * s, v + (j + g) * s) == 1;
179 j -= g) {
180 p1 = (void *)(v + j * s);
181 p2 = (void *)(v + (j + g) * s);
182 for (ii = 0; ii < s / 4; ii++) {
183 tmp = *p1;
184 *p1++ = *p2;
185 *p2++ = tmp;
186 }
187 }
188 }
189 }
190 }
191
192 /*
193 * Compare two acls, all fields. Returns:
194 * -1 (less than)
195 * 0 (equal)
196 * +1 (greater than)
197 */
198 int
199 cmp2acls(void *a, void *b)
200 {
201 aclent_t *x = (aclent_t *)a;
202 aclent_t *y = (aclent_t *)b;
203
204 /* Compare types */
205 if (x->a_type < y->a_type)
206 return (-1);
207 if (x->a_type > y->a_type)
208 return (1);
209 /* Equal types; compare id's */
210 if (x->a_id < y->a_id)
211 return (-1);
212 if (x->a_id > y->a_id)
213 return (1);
214 /* Equal ids; compare perms */
215 if (x->a_perm < y->a_perm)
216 return (-1);
217 if (x->a_perm > y->a_perm)
218 return (1);
219 /* Totally equal */
220 return (0);
221 }
222
223 /*ARGSUSED*/
224 static void *
225 cacl_realloc(void *ptr, size_t size, size_t new_size)
226 {
227 #if defined(_KERNEL)
228 void *tmp;
229
230 tmp = kmem_alloc(new_size, KM_SLEEP);
231 (void) memcpy(tmp, ptr, (size < new_size) ? size : new_size);
232 kmem_free(ptr, size);
233 return (tmp);
234 #else
235 return (realloc(ptr, new_size));
236 #endif
237 }
238
239 static int
240 cacl_malloc(void **ptr, size_t size)
241 {
242 #if defined(_KERNEL)
243 *ptr = kmem_zalloc(size, KM_SLEEP);
244 return (0);
245 #else
246 *ptr = calloc(1, size);
247 if (*ptr == NULL)
248 return (errno);
249
250 return (0);
251 #endif
252 }
253
254 /*ARGSUSED*/
255 static void
256 cacl_free(void *ptr, size_t size)
257 {
258 #if defined(_KERNEL)
259 kmem_free(ptr, size);
260 #else
261 free(ptr);
262 #endif
263 }
264
265 acl_t *
266 acl_alloc(enum acl_type type)
267 {
268 acl_t *aclp;
269
270 if (cacl_malloc((void **)&aclp, sizeof (acl_t)) != 0)
271 return (NULL);
272
273 aclp->acl_aclp = NULL;
274 aclp->acl_cnt = 0;
275
276 switch (type) {
277 case ACE_T:
278 aclp->acl_type = ACE_T;
279 aclp->acl_entry_size = sizeof (ace_t);
280 break;
281 case ACLENT_T:
282 aclp->acl_type = ACLENT_T;
283 aclp->acl_entry_size = sizeof (aclent_t);
284 break;
285 default:
286 acl_free(aclp);
287 aclp = NULL;
288 }
289 return (aclp);
290 }
291
292 /*
293 * Free acl_t structure
294 */
295 void
296 acl_free(acl_t *aclp)
297 {
298 int acl_size;
299
300 if (aclp == NULL)
301 return;
302
303 if (aclp->acl_aclp) {
304 acl_size = aclp->acl_cnt * aclp->acl_entry_size;
305 cacl_free(aclp->acl_aclp, acl_size);
306 }
307
308 cacl_free(aclp, sizeof (acl_t));
309 }
310
311 static uint32_t
312 access_mask_set(int haswriteperm, int hasreadperm, int isowner, int isallow)
313 {
314 uint32_t access_mask = 0;
315 int acl_produce;
316 int synchronize_set = 0, write_owner_set = 0;
317 int delete_set = 0, write_attrs_set = 0;
318 int read_named_set = 0, write_named_set = 0;
319
320 acl_produce = (ACL_SYNCHRONIZE_SET_ALLOW |
321 ACL_WRITE_ATTRS_OWNER_SET_ALLOW |
322 ACL_WRITE_ATTRS_WRITER_SET_DENY);
323
324 if (isallow) {
325 synchronize_set = ACL_SYNCHRONIZE_SET_ALLOW;
326 write_owner_set = ACL_WRITE_OWNER_SET_ALLOW;
327 delete_set = ACL_DELETE_SET_ALLOW;
328 if (hasreadperm)
329 read_named_set = ACL_READ_NAMED_READER_SET_ALLOW;
330 if (haswriteperm)
331 write_named_set = ACL_WRITE_NAMED_WRITER_SET_ALLOW;
332 if (isowner)
333 write_attrs_set = ACL_WRITE_ATTRS_OWNER_SET_ALLOW;
334 else if (haswriteperm)
335 write_attrs_set = ACL_WRITE_ATTRS_WRITER_SET_ALLOW;
336 } else {
337
338 synchronize_set = ACL_SYNCHRONIZE_SET_DENY;
339 write_owner_set = ACL_WRITE_OWNER_SET_DENY;
340 delete_set = ACL_DELETE_SET_DENY;
341 if (hasreadperm)
342 read_named_set = ACL_READ_NAMED_READER_SET_DENY;
343 if (haswriteperm)
344 write_named_set = ACL_WRITE_NAMED_WRITER_SET_DENY;
345 if (isowner)
346 write_attrs_set = ACL_WRITE_ATTRS_OWNER_SET_DENY;
347 else if (haswriteperm)
348 write_attrs_set = ACL_WRITE_ATTRS_WRITER_SET_DENY;
349 else
350 /*
351 * If the entity is not the owner and does not
352 * have write permissions ACE_WRITE_ATTRIBUTES will
353 * always go in the DENY ACE.
354 */
355 access_mask |= ACE_WRITE_ATTRIBUTES;
356 }
357
358 if (acl_produce & synchronize_set)
359 access_mask |= ACE_SYNCHRONIZE;
360 if (acl_produce & write_owner_set)
361 access_mask |= ACE_WRITE_OWNER;
362 if (acl_produce & delete_set)
363 access_mask |= ACE_DELETE;
364 if (acl_produce & write_attrs_set)
365 access_mask |= ACE_WRITE_ATTRIBUTES;
366 if (acl_produce & read_named_set)
367 access_mask |= ACE_READ_NAMED_ATTRS;
368 if (acl_produce & write_named_set)
369 access_mask |= ACE_WRITE_NAMED_ATTRS;
370
371 return (access_mask);
372 }
373
374 /*
375 * Given an mode_t, convert it into an access_mask as used
376 * by nfsace, assuming aclent_t -> nfsace semantics.
377 */
378 static uint32_t
379 mode_to_ace_access(mode_t mode, boolean_t isdir, int isowner, int isallow)
380 {
381 uint32_t access = 0;
382 int haswriteperm = 0;
383 int hasreadperm = 0;
384
385 if (isallow) {
386 haswriteperm = (mode & S_IWOTH);
387 hasreadperm = (mode & S_IROTH);
388 } else {
389 haswriteperm = !(mode & S_IWOTH);
390 hasreadperm = !(mode & S_IROTH);
391 }
392
393 /*
394 * The following call takes care of correctly setting the following
395 * mask bits in the access_mask:
396 * ACE_SYNCHRONIZE, ACE_WRITE_OWNER, ACE_DELETE,
397 * ACE_WRITE_ATTRIBUTES, ACE_WRITE_NAMED_ATTRS, ACE_READ_NAMED_ATTRS
398 */
399 access = access_mask_set(haswriteperm, hasreadperm, isowner, isallow);
400
401 if (isallow) {
402 access |= ACE_READ_ACL | ACE_READ_ATTRIBUTES;
403 if (isowner)
404 access |= ACE_WRITE_ACL;
405 } else {
406 if (! isowner)
407 access |= ACE_WRITE_ACL;
408 }
409
410 /* read */
411 if (mode & S_IROTH) {
412 access |= ACE_READ_DATA;
413 }
414 /* write */
415 if (mode & S_IWOTH) {
416 access |= ACE_WRITE_DATA |
417 ACE_APPEND_DATA;
418 if (isdir)
419 access |= ACE_DELETE_CHILD;
420 }
421 /* exec */
422 if (mode & S_IXOTH) {
423 access |= ACE_EXECUTE;
424 }
425
426 return (access);
427 }
428
429 /*
430 * Given an nfsace (presumably an ALLOW entry), make a
431 * corresponding DENY entry at the address given.
432 */
433 static void
434 ace_make_deny(ace_t *allow, ace_t *deny, int isdir, int isowner)
435 {
436 (void) memcpy(deny, allow, sizeof (ace_t));
437
438 deny->a_who = allow->a_who;
439
440 deny->a_type = ACE_ACCESS_DENIED_ACE_TYPE;
441 deny->a_access_mask ^= ACE_POSIX_SUPPORTED_BITS;
442 if (isdir)
443 deny->a_access_mask ^= ACE_DELETE_CHILD;
444
445 deny->a_access_mask &= ~(ACE_SYNCHRONIZE | ACE_WRITE_OWNER |
446 ACE_DELETE | ACE_WRITE_ATTRIBUTES | ACE_READ_NAMED_ATTRS |
447 ACE_WRITE_NAMED_ATTRS);
448 deny->a_access_mask |= access_mask_set((allow->a_access_mask &
449 ACE_WRITE_DATA), (allow->a_access_mask & ACE_READ_DATA), isowner,
450 B_FALSE);
451 }
452 /*
453 * Make an initial pass over an array of aclent_t's. Gather
454 * information such as an ACL_MASK (if any), number of users,
455 * number of groups, and whether the array needs to be sorted.
456 */
457 static int
458 ln_aent_preprocess(aclent_t *aclent, int n,
459 int *hasmask, mode_t *mask,
460 int *numuser, int *numgroup, int *needsort)
461 {
462 int error = 0;
463 int i;
464 int curtype = 0;
465
466 *hasmask = 0;
467 *mask = 07;
468 *needsort = 0;
469 *numuser = 0;
470 *numgroup = 0;
471
472 for (i = 0; i < n; i++) {
473 if (aclent[i].a_type < curtype)
474 *needsort = 1;
475 else if (aclent[i].a_type > curtype)
476 curtype = aclent[i].a_type;
477 if (aclent[i].a_type & USER)
478 (*numuser)++;
479 if (aclent[i].a_type & (GROUP | GROUP_OBJ))
480 (*numgroup)++;
481 if (aclent[i].a_type & CLASS_OBJ) {
482 if (*hasmask) {
483 error = EINVAL;
484 goto out;
485 } else {
486 *hasmask = 1;
487 *mask = aclent[i].a_perm;
488 }
489 }
490 }
491
492 if ((! *hasmask) && (*numuser + *numgroup > 1)) {
493 error = EINVAL;
494 goto out;
495 }
496
497 out:
498 return (error);
499 }
500
501 /*
502 * Convert an array of aclent_t into an array of nfsace entries,
503 * following POSIX draft -> nfsv4 conversion semantics as outlined in
504 * the IETF draft.
505 */
506 static int
507 ln_aent_to_ace(aclent_t *aclent, int n, ace_t **acepp, int *rescount, int isdir)
508 {
509 int error = 0;
510 mode_t mask;
511 int numuser, numgroup, needsort;
512 int resultsize = 0;
513 int i, groupi = 0, skip;
514 ace_t *acep, *result = NULL;
515 int hasmask;
516
517 error = ln_aent_preprocess(aclent, n, &hasmask, &mask,
518 &numuser, &numgroup, &needsort);
519 if (error != 0)
520 goto out;
521
522 /* allow + deny for each aclent */
523 resultsize = n * 2;
524 if (hasmask) {
525 /*
526 * stick extra deny on the group_obj and on each
527 * user|group for the mask (the group_obj was added
528 * into the count for numgroup)
529 */
530 resultsize += numuser + numgroup;
531 /* ... and don't count the mask itself */
532 resultsize -= 2;
533 }
534
535 /* sort the source if necessary */
536 if (needsort)
537 ksort((caddr_t)aclent, n, sizeof (aclent_t), cmp2acls);
538
539 if (cacl_malloc((void **)&result, resultsize * sizeof (ace_t)) != 0)
540 goto out;
541
542 acep = result;
543
544 for (i = 0; i < n; i++) {
545 /*
546 * don't process CLASS_OBJ (mask); mask was grabbed in
547 * ln_aent_preprocess()
548 */
549 if (aclent[i].a_type & CLASS_OBJ)
550 continue;
551
552 /* If we need an ACL_MASK emulator, prepend it now */
553 if ((hasmask) &&
554 (aclent[i].a_type & (USER | GROUP | GROUP_OBJ))) {
555 acep->a_type = ACE_ACCESS_DENIED_ACE_TYPE;
556 acep->a_flags = 0;
557 if (aclent[i].a_type & GROUP_OBJ) {
558 acep->a_who = (uid_t)-1;
559 acep->a_flags |=
560 (ACE_IDENTIFIER_GROUP|ACE_GROUP);
561 } else if (aclent[i].a_type & USER) {
562 acep->a_who = aclent[i].a_id;
563 } else {
564 acep->a_who = aclent[i].a_id;
565 acep->a_flags |= ACE_IDENTIFIER_GROUP;
566 }
567 if (aclent[i].a_type & ACL_DEFAULT) {
568 acep->a_flags |= ACE_INHERIT_ONLY_ACE |
569 ACE_FILE_INHERIT_ACE |
570 ACE_DIRECTORY_INHERIT_ACE;
571 }
572 /*
573 * Set the access mask for the prepended deny
574 * ace. To do this, we invert the mask (found
575 * in ln_aent_preprocess()) then convert it to an
576 * DENY ace access_mask.
577 */
578 acep->a_access_mask = mode_to_ace_access((mask ^ 07),
579 isdir, 0, 0);
580 acep += 1;
581 }
582
583 /* handle a_perm -> access_mask */
584 acep->a_access_mask = mode_to_ace_access(aclent[i].a_perm,
585 isdir, aclent[i].a_type & USER_OBJ, 1);
586
587 /* emulate a default aclent */
588 if (aclent[i].a_type & ACL_DEFAULT) {
589 acep->a_flags |= ACE_INHERIT_ONLY_ACE |
590 ACE_FILE_INHERIT_ACE |
591 ACE_DIRECTORY_INHERIT_ACE;
592 }
593
594 /*
595 * handle a_perm and a_id
596 *
597 * this must be done last, since it involves the
598 * corresponding deny aces, which are handled
599 * differently for each different a_type.
600 */
601 if (aclent[i].a_type & USER_OBJ) {
602 acep->a_who = (uid_t)-1;
603 acep->a_flags |= ACE_OWNER;
604 ace_make_deny(acep, acep + 1, isdir, B_TRUE);
605 acep += 2;
606 } else if (aclent[i].a_type & USER) {
607 acep->a_who = aclent[i].a_id;
608 ace_make_deny(acep, acep + 1, isdir, B_FALSE);
609 acep += 2;
610 } else if (aclent[i].a_type & (GROUP_OBJ | GROUP)) {
611 if (aclent[i].a_type & GROUP_OBJ) {
612 acep->a_who = (uid_t)-1;
613 acep->a_flags |= ACE_GROUP;
614 } else {
615 acep->a_who = aclent[i].a_id;
616 }
617 acep->a_flags |= ACE_IDENTIFIER_GROUP;
618 /*
619 * Set the corresponding deny for the group ace.
620 *
621 * The deny aces go after all of the groups, unlike
622 * everything else, where they immediately follow
623 * the allow ace.
624 *
625 * We calculate "skip", the number of slots to
626 * skip ahead for the deny ace, here.
627 *
628 * The pattern is:
629 * MD1 A1 MD2 A2 MD3 A3 D1 D2 D3
630 * thus, skip is
631 * (2 * numgroup) - 1 - groupi
632 * (2 * numgroup) to account for MD + A
633 * - 1 to account for the fact that we're on the
634 * access (A), not the mask (MD)
635 * - groupi to account for the fact that we have
636 * passed up groupi number of MD's.
637 */
638 skip = (2 * numgroup) - 1 - groupi;
639 ace_make_deny(acep, acep + skip, isdir, B_FALSE);
640 /*
641 * If we just did the last group, skip acep past
642 * all of the denies; else, just move ahead one.
643 */
644 if (++groupi >= numgroup)
645 acep += numgroup + 1;
646 else
647 acep += 1;
648 } else if (aclent[i].a_type & OTHER_OBJ) {
649 acep->a_who = (uid_t)-1;
650 acep->a_flags |= ACE_EVERYONE;
651 ace_make_deny(acep, acep + 1, isdir, B_FALSE);
652 acep += 2;
653 } else {
654 error = EINVAL;
655 goto out;
656 }
657 }
658
659 *acepp = result;
660 *rescount = resultsize;
661
662 out:
663 if (error != 0) {
664 if ((result != NULL) && (resultsize > 0)) {
665 cacl_free(result, resultsize * sizeof (ace_t));
666 }
667 }
668
669 return (error);
670 }
671
672 static int
673 convert_aent_to_ace(aclent_t *aclentp, int aclcnt, boolean_t isdir,
674 ace_t **retacep, int *retacecnt)
675 {
676 ace_t *acep;
677 ace_t *dfacep;
678 int acecnt = 0;
679 int dfacecnt = 0;
680 int dfaclstart = 0;
681 int dfaclcnt = 0;
682 aclent_t *aclp;
683 int i;
684 int error;
685 int acesz, dfacesz;
686
687 ksort((caddr_t)aclentp, aclcnt, sizeof (aclent_t), cmp2acls);
688
689 for (i = 0, aclp = aclentp; i < aclcnt; aclp++, i++) {
690 if (aclp->a_type & ACL_DEFAULT)
691 break;
692 }
693
694 if (i < aclcnt) {
695 dfaclstart = i;
696 dfaclcnt = aclcnt - i;
697 }
698
699 if (dfaclcnt && !isdir) {
700 return (EINVAL);
701 }
702
703 error = ln_aent_to_ace(aclentp, i, &acep, &acecnt, isdir);
704 if (error)
705 return (error);
706
707 if (dfaclcnt) {
708 error = ln_aent_to_ace(&aclentp[dfaclstart], dfaclcnt,
709 &dfacep, &dfacecnt, isdir);
710 if (error) {
711 if (acep) {
712 cacl_free(acep, acecnt * sizeof (ace_t));
713 }
714 return (error);
715 }
716 }
717
718 if (dfacecnt != 0) {
719 acesz = sizeof (ace_t) * acecnt;
720 dfacesz = sizeof (ace_t) * dfacecnt;
721 acep = cacl_realloc(acep, acesz, acesz + dfacesz);
722 if (acep == NULL)
723 return (ENOMEM);
724 if (dfaclcnt) {
725 (void) memcpy(acep + acecnt, dfacep, dfacesz);
726 }
727 }
728 if (dfaclcnt)
729 cacl_free(dfacep, dfacecnt * sizeof (ace_t));
730
731 *retacecnt = acecnt + dfacecnt;
732 *retacep = acep;
733 return (0);
734 }
735
736 static int
737 ace_mask_to_mode(uint32_t mask, o_mode_t *modep, boolean_t isdir)
738 {
739 int error = 0;
740 o_mode_t mode = 0;
741 uint32_t bits, wantbits;
742
743 /* read */
744 if (mask & ACE_READ_DATA)
745 mode |= S_IROTH;
746
747 /* write */
748 wantbits = (ACE_WRITE_DATA | ACE_APPEND_DATA);
749 if (isdir)
750 wantbits |= ACE_DELETE_CHILD;
751 bits = mask & wantbits;
752 if (bits != 0) {
753 if (bits != wantbits) {
754 error = ENOTSUP;
755 goto out;
756 }
757 mode |= S_IWOTH;
758 }
759
760 /* exec */
761 if (mask & ACE_EXECUTE) {
762 mode |= S_IXOTH;
763 }
764
765 *modep = mode;
766
767 out:
768 return (error);
769 }
770
771 static void
772 acevals_init(acevals_t *vals, uid_t key)
773 {
774 bzero(vals, sizeof (*vals));
775 vals->allowed = ACE_MASK_UNDEFINED;
776 vals->denied = ACE_MASK_UNDEFINED;
777 vals->mask = ACE_MASK_UNDEFINED;
778 vals->key = key;
779 }
780
781 static void
782 ace_list_init(ace_list_t *al, int dfacl_flag)
783 {
784 acevals_init(&al->user_obj, 0);
785 acevals_init(&al->group_obj, 0);
786 acevals_init(&al->other_obj, 0);
787 al->numusers = 0;
788 al->numgroups = 0;
789 al->acl_mask = 0;
790 al->hasmask = 0;
791 al->state = ace_unused;
792 al->seen = 0;
793 al->dfacl_flag = dfacl_flag;
794 }
795
796 /*
797 * Find or create an acevals holder for a given id and avl tree.
798 *
799 * Note that only one thread will ever touch these avl trees, so
800 * there is no need for locking.
801 */
802 static acevals_t *
803 acevals_find(ace_t *ace, avl_tree_t *avl, int *num)
804 {
805 acevals_t key, *rc;
806 avl_index_t where;
807
808 key.key = ace->a_who;
809 rc = avl_find(avl, &key, &where);
810 if (rc != NULL)
811 return (rc);
812
813 /* this memory is freed by ln_ace_to_aent()->ace_list_free() */
814 if (cacl_malloc((void **)&rc, sizeof (acevals_t)) != 0)
815 return (NULL);
816
817 acevals_init(rc, ace->a_who);
818 avl_insert(avl, rc, where);
819 (*num)++;
820
821 return (rc);
822 }
823
824 static int
825 access_mask_check(ace_t *acep, int mask_bit, int isowner)
826 {
827 int set_deny, err_deny;
828 int set_allow, err_allow;
829 int acl_consume;
830 int haswriteperm, hasreadperm;
831
832 if (acep->a_type == ACE_ACCESS_DENIED_ACE_TYPE) {
833 haswriteperm = (acep->a_access_mask & ACE_WRITE_DATA) ? 0 : 1;
834 hasreadperm = (acep->a_access_mask & ACE_READ_DATA) ? 0 : 1;
835 } else {
836 haswriteperm = (acep->a_access_mask & ACE_WRITE_DATA) ? 1 : 0;
837 hasreadperm = (acep->a_access_mask & ACE_READ_DATA) ? 1 : 0;
838 }
839
840 acl_consume = (ACL_SYNCHRONIZE_ERR_DENY |
841 ACL_DELETE_ERR_DENY |
842 ACL_WRITE_OWNER_ERR_DENY |
843 ACL_WRITE_OWNER_ERR_ALLOW |
844 ACL_WRITE_ATTRS_OWNER_SET_ALLOW |
845 ACL_WRITE_ATTRS_OWNER_ERR_DENY |
846 ACL_WRITE_ATTRS_WRITER_SET_DENY |
847 ACL_WRITE_ATTRS_WRITER_ERR_ALLOW |
848 ACL_WRITE_NAMED_WRITER_ERR_DENY |
849 ACL_READ_NAMED_READER_ERR_DENY);
850
851 if (mask_bit == ACE_SYNCHRONIZE) {
852 set_deny = ACL_SYNCHRONIZE_SET_DENY;
853 err_deny = ACL_SYNCHRONIZE_ERR_DENY;
854 set_allow = ACL_SYNCHRONIZE_SET_ALLOW;
855 err_allow = ACL_SYNCHRONIZE_ERR_ALLOW;
856 } else if (mask_bit == ACE_WRITE_OWNER) {
857 set_deny = ACL_WRITE_OWNER_SET_DENY;
858 err_deny = ACL_WRITE_OWNER_ERR_DENY;
859 set_allow = ACL_WRITE_OWNER_SET_ALLOW;
860 err_allow = ACL_WRITE_OWNER_ERR_ALLOW;
861 } else if (mask_bit == ACE_DELETE) {
862 set_deny = ACL_DELETE_SET_DENY;
863 err_deny = ACL_DELETE_ERR_DENY;
864 set_allow = ACL_DELETE_SET_ALLOW;
865 err_allow = ACL_DELETE_ERR_ALLOW;
866 } else if (mask_bit == ACE_WRITE_ATTRIBUTES) {
867 if (isowner) {
868 set_deny = ACL_WRITE_ATTRS_OWNER_SET_DENY;
869 err_deny = ACL_WRITE_ATTRS_OWNER_ERR_DENY;
870 set_allow = ACL_WRITE_ATTRS_OWNER_SET_ALLOW;
871 err_allow = ACL_WRITE_ATTRS_OWNER_ERR_ALLOW;
872 } else if (haswriteperm) {
873 set_deny = ACL_WRITE_ATTRS_WRITER_SET_DENY;
874 err_deny = ACL_WRITE_ATTRS_WRITER_ERR_DENY;
875 set_allow = ACL_WRITE_ATTRS_WRITER_SET_ALLOW;
876 err_allow = ACL_WRITE_ATTRS_WRITER_ERR_ALLOW;
877 } else {
878 if ((acep->a_access_mask & mask_bit) &&
879 (acep->a_type & ACE_ACCESS_ALLOWED_ACE_TYPE)) {
880 return (ENOTSUP);
881 }
882 return (0);
883 }
884 } else if (mask_bit == ACE_READ_NAMED_ATTRS) {
885 if (!hasreadperm)
886 return (0);
887
888 set_deny = ACL_READ_NAMED_READER_SET_DENY;
889 err_deny = ACL_READ_NAMED_READER_ERR_DENY;
890 set_allow = ACL_READ_NAMED_READER_SET_ALLOW;
891 err_allow = ACL_READ_NAMED_READER_ERR_ALLOW;
892 } else if (mask_bit == ACE_WRITE_NAMED_ATTRS) {
893 if (!haswriteperm)
894 return (0);
895
896 set_deny = ACL_WRITE_NAMED_WRITER_SET_DENY;
897 err_deny = ACL_WRITE_NAMED_WRITER_ERR_DENY;
898 set_allow = ACL_WRITE_NAMED_WRITER_SET_ALLOW;
899 err_allow = ACL_WRITE_NAMED_WRITER_ERR_ALLOW;
900 } else {
901 return (EINVAL);
902 }
903
904 if (acep->a_type == ACE_ACCESS_DENIED_ACE_TYPE) {
905 if (acl_consume & set_deny) {
906 if (!(acep->a_access_mask & mask_bit)) {
907 return (ENOTSUP);
908 }
909 } else if (acl_consume & err_deny) {
910 if (acep->a_access_mask & mask_bit) {
911 return (ENOTSUP);
912 }
913 }
914 } else {
915 /* ACE_ACCESS_ALLOWED_ACE_TYPE */
916 if (acl_consume & set_allow) {
917 if (!(acep->a_access_mask & mask_bit)) {
918 return (ENOTSUP);
919 }
920 } else if (acl_consume & err_allow) {
921 if (acep->a_access_mask & mask_bit) {
922 return (ENOTSUP);
923 }
924 }
925 }
926 return (0);
927 }
928
929 static int
930 ace_to_aent_legal(ace_t *acep)
931 {
932 int error = 0;
933 int isowner;
934
935 /* only ALLOW or DENY */
936 if ((acep->a_type != ACE_ACCESS_ALLOWED_ACE_TYPE) &&
937 (acep->a_type != ACE_ACCESS_DENIED_ACE_TYPE)) {
938 error = ENOTSUP;
939 goto out;
940 }
941
942 /* check for invalid flags */
943 if (acep->a_flags & ~(ACE_VALID_FLAG_BITS)) {
944 error = EINVAL;
945 goto out;
946 }
947
948 /* some flags are illegal */
949 if (acep->a_flags & (ACE_SUCCESSFUL_ACCESS_ACE_FLAG |
950 ACE_FAILED_ACCESS_ACE_FLAG |
951 ACE_NO_PROPAGATE_INHERIT_ACE)) {
952 error = ENOTSUP;
953 goto out;
954 }
955
956 /* check for invalid masks */
957 if (acep->a_access_mask & ~(ACE_VALID_MASK_BITS)) {
958 error = EINVAL;
959 goto out;
960 }
961
962 if ((acep->a_flags & ACE_OWNER)) {
963 isowner = 1;
964 } else {
965 isowner = 0;
966 }
967
968 error = access_mask_check(acep, ACE_SYNCHRONIZE, isowner);
969 if (error)
970 goto out;
971
972 error = access_mask_check(acep, ACE_WRITE_OWNER, isowner);
973 if (error)
974 goto out;
975
976 error = access_mask_check(acep, ACE_DELETE, isowner);
977 if (error)
978 goto out;
979
980 error = access_mask_check(acep, ACE_WRITE_ATTRIBUTES, isowner);
981 if (error)
982 goto out;
983
984 error = access_mask_check(acep, ACE_READ_NAMED_ATTRS, isowner);
985 if (error)
986 goto out;
987
988 error = access_mask_check(acep, ACE_WRITE_NAMED_ATTRS, isowner);
989 if (error)
990 goto out;
991
992 /* more detailed checking of masks */
993 if (acep->a_type == ACE_ACCESS_ALLOWED_ACE_TYPE) {
994 if (! (acep->a_access_mask & ACE_READ_ATTRIBUTES)) {
995 error = ENOTSUP;
996 goto out;
997 }
998 if ((acep->a_access_mask & ACE_WRITE_DATA) &&
999 (! (acep->a_access_mask & ACE_APPEND_DATA))) {
1000 error = ENOTSUP;
1001 goto out;
1002 }
1003 if ((! (acep->a_access_mask & ACE_WRITE_DATA)) &&
1004 (acep->a_access_mask & ACE_APPEND_DATA)) {
1005 error = ENOTSUP;
1006 goto out;
1007 }
1008 }
1009
1010 /* ACL enforcement */
1011 if ((acep->a_access_mask & ACE_READ_ACL) &&
1012 (acep->a_type != ACE_ACCESS_ALLOWED_ACE_TYPE)) {
1013 error = ENOTSUP;
1014 goto out;
1015 }
1016 if (acep->a_access_mask & ACE_WRITE_ACL) {
1017 if ((acep->a_type == ACE_ACCESS_DENIED_ACE_TYPE) &&
1018 (isowner)) {
1019 error = ENOTSUP;
1020 goto out;
1021 }
1022 if ((acep->a_type == ACE_ACCESS_ALLOWED_ACE_TYPE) &&
1023 (! isowner)) {
1024 error = ENOTSUP;
1025 goto out;
1026 }
1027 }
1028
1029 out:
1030 return (error);
1031 }
1032
1033 static int
1034 ace_allow_to_mode(uint32_t mask, o_mode_t *modep, boolean_t isdir)
1035 {
1036 /* ACE_READ_ACL and ACE_READ_ATTRIBUTES must both be set */
1037 if ((mask & (ACE_READ_ACL | ACE_READ_ATTRIBUTES)) !=
1038 (ACE_READ_ACL | ACE_READ_ATTRIBUTES)) {
1039 return (ENOTSUP);
1040 }
1041
1042 return (ace_mask_to_mode(mask, modep, isdir));
1043 }
1044
1045 static int
1046 acevals_to_aent(acevals_t *vals, aclent_t *dest, ace_list_t *list,
1047 uid_t owner, gid_t group, boolean_t isdir)
1048 {
1049 int error;
1050 uint32_t flips = ACE_POSIX_SUPPORTED_BITS;
1051
1052 if (isdir)
1053 flips |= ACE_DELETE_CHILD;
1054 if (vals->allowed != (vals->denied ^ flips)) {
1055 error = ENOTSUP;
1056 goto out;
1057 }
1058 if ((list->hasmask) && (list->acl_mask != vals->mask) &&
1059 (vals->aent_type & (USER | GROUP | GROUP_OBJ))) {
1060 error = ENOTSUP;
1061 goto out;
1062 }
1063 error = ace_allow_to_mode(vals->allowed, &dest->a_perm, isdir);
1064 if (error != 0)
1065 goto out;
1066 dest->a_type = vals->aent_type;
1067 if (dest->a_type & (USER | GROUP)) {
1068 dest->a_id = vals->key;
1069 } else if (dest->a_type & USER_OBJ) {
1070 dest->a_id = owner;
1071 } else if (dest->a_type & GROUP_OBJ) {
1072 dest->a_id = group;
1073 } else if (dest->a_type & OTHER_OBJ) {
1074 dest->a_id = 0;
1075 } else {
1076 error = EINVAL;
1077 goto out;
1078 }
1079
1080 out:
1081 return (error);
1082 }
1083
1084
1085 static int
1086 ace_list_to_aent(ace_list_t *list, aclent_t **aclentp, int *aclcnt,
1087 uid_t owner, gid_t group, boolean_t isdir)
1088 {
1089 int error = 0;
1090 aclent_t *aent, *result = NULL;
1091 acevals_t *vals;
1092 int resultcount;
1093
1094 if ((list->seen & (USER_OBJ | GROUP_OBJ | OTHER_OBJ)) !=
1095 (USER_OBJ | GROUP_OBJ | OTHER_OBJ)) {
1096 return (ENOTSUP);
1097 }
1098
1099 if ((! list->hasmask) && (list->numusers + list->numgroups > 0)) {
1100 return (ENOTSUP);
1101 }
1102
1103 resultcount = 3 + list->numusers + list->numgroups;
1104 /*
1105 * This must be the same condition as below, when we add the CLASS_OBJ
1106 * (aka ACL mask)
1107 */
1108 if ((list->hasmask) || (! list->dfacl_flag))
1109 resultcount += 1;
1110
1111 if (cacl_malloc((void **)&result,
1112 resultcount * sizeof (aclent_t)) != 0) {
1113 error = ENOMEM;
1114 goto out;
1115 }
1116 aent = result;
1117
1118 /* USER_OBJ */
1119 if (!(list->user_obj.aent_type & USER_OBJ)) {
1120 error = EINVAL;
1121 goto out;
1122 }
1123
1124 error = acevals_to_aent(&list->user_obj, aent, list, owner, group,
1125 isdir);
1126
1127 if (error != 0)
1128 goto out;
1129 ++aent;
1130 /* USER */
1131 vals = NULL;
1132 for (vals = avl_first(&list->user); vals != NULL;
1133 vals = AVL_NEXT(&list->user, vals)) {
1134 if (!(vals->aent_type & USER)) {
1135 error = EINVAL;
1136 goto out;
1137 }
1138 error = acevals_to_aent(vals, aent, list, owner, group,
1139 isdir);
1140 if (error != 0)
1141 goto out;
1142 ++aent;
1143 }
1144 /* GROUP_OBJ */
1145 if (!(list->group_obj.aent_type & GROUP_OBJ)) {
1146 error = EINVAL;
1147 goto out;
1148 }
1149 error = acevals_to_aent(&list->group_obj, aent, list, owner, group,
1150 isdir);
1151 if (error != 0)
1152 goto out;
1153 ++aent;
1154 /* GROUP */
1155 vals = NULL;
1156 for (vals = avl_first(&list->group); vals != NULL;
1157 vals = AVL_NEXT(&list->group, vals)) {
1158 if (!(vals->aent_type & GROUP)) {
1159 error = EINVAL;
1160 goto out;
1161 }
1162 error = acevals_to_aent(vals, aent, list, owner, group,
1163 isdir);
1164 if (error != 0)
1165 goto out;
1166 ++aent;
1167 }
1168 /*
1169 * CLASS_OBJ (aka ACL_MASK)
1170 *
1171 * An ACL_MASK is not fabricated if the ACL is a default ACL.
1172 * This is to follow UFS's behavior.
1173 */
1174 if ((list->hasmask) || (! list->dfacl_flag)) {
1175 if (list->hasmask) {
1176 uint32_t flips = ACE_POSIX_SUPPORTED_BITS;
1177 if (isdir)
1178 flips |= ACE_DELETE_CHILD;
1179 error = ace_mask_to_mode(list->acl_mask ^ flips,
1180 &aent->a_perm, isdir);
1181 if (error != 0)
1182 goto out;
1183 } else {
1184 /* fabricate the ACL_MASK from the group permissions */
1185 error = ace_mask_to_mode(list->group_obj.allowed,
1186 &aent->a_perm, isdir);
1187 if (error != 0)
1188 goto out;
1189 }
1190 aent->a_id = 0;
1191 aent->a_type = CLASS_OBJ | list->dfacl_flag;
1192 ++aent;
1193 }
1194 /* OTHER_OBJ */
1195 if (!(list->other_obj.aent_type & OTHER_OBJ)) {
1196 error = EINVAL;
1197 goto out;
1198 }
1199 error = acevals_to_aent(&list->other_obj, aent, list, owner, group,
1200 isdir);
1201 if (error != 0)
1202 goto out;
1203 ++aent;
1204
1205 *aclentp = result;
1206 *aclcnt = resultcount;
1207
1208 out:
1209 if (error != 0) {
1210 if (result != NULL)
1211 cacl_free(result, resultcount * sizeof (aclent_t));
1212 }
1213
1214 return (error);
1215 }
1216
1217
1218 /*
1219 * free all data associated with an ace_list
1220 */
1221 static void
1222 ace_list_free(ace_list_t *al)
1223 {
1224 acevals_t *node;
1225 void *cookie;
1226
1227 if (al == NULL)
1228 return;
1229
1230 cookie = NULL;
1231 while ((node = avl_destroy_nodes(&al->user, &cookie)) != NULL)
1232 cacl_free(node, sizeof (acevals_t));
1233 cookie = NULL;
1234 while ((node = avl_destroy_nodes(&al->group, &cookie)) != NULL)
1235 cacl_free(node, sizeof (acevals_t));
1236
1237 avl_destroy(&al->user);
1238 avl_destroy(&al->group);
1239
1240 /* free the container itself */
1241 cacl_free(al, sizeof (ace_list_t));
1242 }
1243
1244 static int
1245 acevals_compare(const void *va, const void *vb)
1246 {
1247 const acevals_t *a = va, *b = vb;
1248
1249 if (a->key == b->key)
1250 return (0);
1251
1252 if (a->key > b->key)
1253 return (1);
1254
1255 else
1256 return (-1);
1257 }
1258
1259 /*
1260 * Convert a list of ace_t entries to equivalent regular and default
1261 * aclent_t lists. Return error (ENOTSUP) when conversion is not possible.
1262 */
1263 static int
1264 ln_ace_to_aent(ace_t *ace, int n, uid_t owner, gid_t group,
1265 aclent_t **aclentp, int *aclcnt, aclent_t **dfaclentp, int *dfaclcnt,
1266 boolean_t isdir)
1267 {
1268 int error = 0;
1269 ace_t *acep;
1270 uint32_t bits;
1271 int i;
1272 ace_list_t *normacl = NULL, *dfacl = NULL, *acl;
1273 acevals_t *vals;
1274
1275 *aclentp = NULL;
1276 *aclcnt = 0;
1277 *dfaclentp = NULL;
1278 *dfaclcnt = 0;
1279
1280 /* we need at least user_obj, group_obj, and other_obj */
1281 if (n < 6) {
1282 error = ENOTSUP;
1283 goto out;
1284 }
1285 if (ace == NULL) {
1286 error = EINVAL;
1287 goto out;
1288 }
1289
1290 error = cacl_malloc((void **)&normacl, sizeof (ace_list_t));
1291 if (error != 0)
1292 goto out;
1293
1294 avl_create(&normacl->user, acevals_compare, sizeof (acevals_t),
1295 offsetof(acevals_t, avl));
1296 avl_create(&normacl->group, acevals_compare, sizeof (acevals_t),
1297 offsetof(acevals_t, avl));
1298
1299 ace_list_init(normacl, 0);
1300
1301 error = cacl_malloc((void **)&dfacl, sizeof (ace_list_t));
1302 if (error != 0)
1303 goto out;
1304
1305 avl_create(&dfacl->user, acevals_compare, sizeof (acevals_t),
1306 offsetof(acevals_t, avl));
1307 avl_create(&dfacl->group, acevals_compare, sizeof (acevals_t),
1308 offsetof(acevals_t, avl));
1309 ace_list_init(dfacl, ACL_DEFAULT);
1310
1311 /* process every ace_t... */
1312 for (i = 0; i < n; i++) {
1313 acep = &ace[i];
1314
1315 /* rule out certain cases quickly */
1316 error = ace_to_aent_legal(acep);
1317 if (error != 0)
1318 goto out;
1319
1320 /*
1321 * Turn off these bits in order to not have to worry about
1322 * them when doing the checks for compliments.
1323 */
1324 acep->a_access_mask &= ~(ACE_WRITE_OWNER | ACE_DELETE |
1325 ACE_SYNCHRONIZE | ACE_WRITE_ATTRIBUTES |
1326 ACE_READ_NAMED_ATTRS | ACE_WRITE_NAMED_ATTRS);
1327
1328 /* see if this should be a regular or default acl */
1329 bits = acep->a_flags &
1330 (ACE_INHERIT_ONLY_ACE |
1331 ACE_FILE_INHERIT_ACE |
1332 ACE_DIRECTORY_INHERIT_ACE);
1333 if (bits != 0) {
1334 /* all or nothing on these inherit bits */
1335 if (bits != (ACE_INHERIT_ONLY_ACE |
1336 ACE_FILE_INHERIT_ACE |
1337 ACE_DIRECTORY_INHERIT_ACE)) {
1338 error = ENOTSUP;
1339 goto out;
1340 }
1341 acl = dfacl;
1342 } else {
1343 acl = normacl;
1344 }
1345
1346 if ((acep->a_flags & ACE_OWNER)) {
1347 if (acl->state > ace_user_obj) {
1348 error = ENOTSUP;
1349 goto out;
1350 }
1351 acl->state = ace_user_obj;
1352 acl->seen |= USER_OBJ;
1353 vals = &acl->user_obj;
1354 vals->aent_type = USER_OBJ | acl->dfacl_flag;
1355 } else if ((acep->a_flags & ACE_EVERYONE)) {
1356 acl->state = ace_other_obj;
1357 acl->seen |= OTHER_OBJ;
1358 vals = &acl->other_obj;
1359 vals->aent_type = OTHER_OBJ | acl->dfacl_flag;
1360 } else if (acep->a_flags & ACE_IDENTIFIER_GROUP) {
1361 if (acl->state > ace_group) {
1362 error = ENOTSUP;
1363 goto out;
1364 }
1365 if ((acep->a_flags & ACE_GROUP)) {
1366 acl->seen |= GROUP_OBJ;
1367 vals = &acl->group_obj;
1368 vals->aent_type = GROUP_OBJ | acl->dfacl_flag;
1369 } else {
1370 acl->seen |= GROUP;
1371 vals = acevals_find(acep, &acl->group,
1372 &acl->numgroups);
1373 if (vals == NULL) {
1374 error = ENOMEM;
1375 goto out;
1376 }
1377 vals->aent_type = GROUP | acl->dfacl_flag;
1378 }
1379 acl->state = ace_group;
1380 } else {
1381 if (acl->state > ace_user) {
1382 error = ENOTSUP;
1383 goto out;
1384 }
1385 acl->state = ace_user;
1386 acl->seen |= USER;
1387 vals = acevals_find(acep, &acl->user,
1388 &acl->numusers);
1389 if (vals == NULL) {
1390 error = ENOMEM;
1391 goto out;
1392 }
1393 vals->aent_type = USER | acl->dfacl_flag;
1394 }
1395
1396 if (!(acl->state > ace_unused)) {
1397 error = EINVAL;
1398 goto out;
1399 }
1400
1401 if (acep->a_type == ACE_ACCESS_ALLOWED_ACE_TYPE) {
1402 /* no more than one allowed per aclent_t */
1403 if (vals->allowed != ACE_MASK_UNDEFINED) {
1404 error = ENOTSUP;
1405 goto out;
1406 }
1407 vals->allowed = acep->a_access_mask;
1408 } else {
1409 /*
1410 * it's a DENY; if there was a previous DENY, it
1411 * must have been an ACL_MASK.
1412 */
1413 if (vals->denied != ACE_MASK_UNDEFINED) {
1414 /* ACL_MASK is for USER and GROUP only */
1415 if ((acl->state != ace_user) &&
1416 (acl->state != ace_group)) {
1417 error = ENOTSUP;
1418 goto out;
1419 }
1420
1421 if (! acl->hasmask) {
1422 acl->hasmask = 1;
1423 acl->acl_mask = vals->denied;
1424 /* check for mismatched ACL_MASK emulations */
1425 } else if (acl->acl_mask != vals->denied) {
1426 error = ENOTSUP;
1427 goto out;
1428 }
1429 vals->mask = vals->denied;
1430 }
1431 vals->denied = acep->a_access_mask;
1432 }
1433 }
1434
1435 /* done collating; produce the aclent_t lists */
1436 if (normacl->state != ace_unused) {
1437 error = ace_list_to_aent(normacl, aclentp, aclcnt,
1438 owner, group, isdir);
1439 if (error != 0) {
1440 goto out;
1441 }
1442 }
1443 if (dfacl->state != ace_unused) {
1444 error = ace_list_to_aent(dfacl, dfaclentp, dfaclcnt,
1445 owner, group, isdir);
1446 if (error != 0) {
1447 goto out;
1448 }
1449 }
1450
1451 out:
1452 if (normacl != NULL)
1453 ace_list_free(normacl);
1454 if (dfacl != NULL)
1455 ace_list_free(dfacl);
1456
1457 return (error);
1458 }
1459
1460 static int
1461 convert_ace_to_aent(ace_t *acebufp, int acecnt, boolean_t isdir,
1462 uid_t owner, gid_t group, aclent_t **retaclentp, int *retaclcnt)
1463 {
1464 int error = 0;
1465 aclent_t *aclentp, *dfaclentp;
1466 int aclcnt, dfaclcnt;
1467 int aclsz, dfaclsz = 0;
1468
1469 error = ln_ace_to_aent(acebufp, acecnt, owner, group,
1470 &aclentp, &aclcnt, &dfaclentp, &dfaclcnt, isdir);
1471
1472 if (error)
1473 return (error);
1474
1475
1476 if (dfaclcnt != 0) {
1477 /*
1478 * Slap aclentp and dfaclentp into a single array.
1479 */
1480 aclsz = sizeof (aclent_t) * aclcnt;
1481 dfaclsz = sizeof (aclent_t) * dfaclcnt;
1482 aclentp = cacl_realloc(aclentp, aclsz, aclsz + dfaclsz);
1483 if (aclentp != NULL) {
1484 (void) memcpy(aclentp + aclcnt, dfaclentp, dfaclsz);
1485 } else {
1486 error = ENOMEM;
1487 }
1488 }
1489
1490 if (aclentp) {
1491 *retaclentp = aclentp;
1492 *retaclcnt = aclcnt + dfaclcnt;
1493 }
1494
1495 if (dfaclentp)
1496 cacl_free(dfaclentp, dfaclsz);
1497
1498 return (error);
1499 }
1500
1501
1502 int
1503 acl_translate(acl_t *aclp, int target_flavor, boolean_t isdir, uid_t owner,
1504 gid_t group)
1505 {
1506 int aclcnt;
1507 void *acldata;
1508 int error;
1509
1510 /*
1511 * See if we need to translate
1512 */
1513 if ((target_flavor == _ACL_ACE_ENABLED && aclp->acl_type == ACE_T) ||
1514 (target_flavor == _ACL_ACLENT_ENABLED &&
1515 aclp->acl_type == ACLENT_T))
1516 return (0);
1517
1518 if (target_flavor == -1) {
1519 error = EINVAL;
1520 goto out;
1521 }
1522
1523 if (target_flavor == _ACL_ACE_ENABLED &&
1524 aclp->acl_type == ACLENT_T) {
1525 error = convert_aent_to_ace(aclp->acl_aclp,
1526 aclp->acl_cnt, isdir, (ace_t **)&acldata, &aclcnt);
1527 if (error)
1528 goto out;
1529
1530 } else if (target_flavor == _ACL_ACLENT_ENABLED &&
1531 aclp->acl_type == ACE_T) {
1532 error = convert_ace_to_aent(aclp->acl_aclp, aclp->acl_cnt,
1533 isdir, owner, group, (aclent_t **)&acldata, &aclcnt);
1534 if (error)
1535 goto out;
1536 } else {
1537 error = ENOTSUP;
1538 goto out;
1539 }
1540
1541 /*
1542 * replace old acl with newly translated acl
1543 */
1544 cacl_free(aclp->acl_aclp, aclp->acl_cnt * aclp->acl_entry_size);
1545 aclp->acl_aclp = acldata;
1546 aclp->acl_cnt = aclcnt;
1547 if (target_flavor == _ACL_ACE_ENABLED) {
1548 aclp->acl_type = ACE_T;
1549 aclp->acl_entry_size = sizeof (ace_t);
1550 } else {
1551 aclp->acl_type = ACLENT_T;
1552 aclp->acl_entry_size = sizeof (aclent_t);
1553 }
1554 return (0);
1555
1556 out:
1557
1558 #if defined(_KERNEL)
1559 return (error);
1560 #else
1561 errno = error;
1562 return (-1);
1563 #endif
1564 }
1565
1566 #define SET_ACE(acl, index, who, mask, type, flags) { \
1567 acl[0][index].a_who = (uint32_t)who; \
1568 acl[0][index].a_type = type; \
1569 acl[0][index].a_flags = flags; \
1570 acl[0][index++].a_access_mask = mask; \
1571 }
1572
1573 void
1574 acl_trivial_access_masks(mode_t mode, boolean_t isdir, trivial_acl_t *masks)
1575 {
1576 uint32_t read_mask = ACE_READ_DATA;
1577 uint32_t write_mask = ACE_WRITE_DATA|ACE_APPEND_DATA;
1578 uint32_t execute_mask = ACE_EXECUTE;
1579
1580 if (isdir)
1581 write_mask |= ACE_DELETE_CHILD;
1582
1583 masks->deny1 = 0;
1584 if (!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH)))
1585 masks->deny1 |= read_mask;
1586 if (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IWOTH)))
1587 masks->deny1 |= write_mask;
1588 if (!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH)))
1589 masks->deny1 |= execute_mask;
1590
1591 masks->deny2 = 0;
1592 if (!(mode & S_IRGRP) && (mode & S_IROTH))
1593 masks->deny2 |= read_mask;
1594 if (!(mode & S_IWGRP) && (mode & S_IWOTH))
1595 masks->deny2 |= write_mask;
1596 if (!(mode & S_IXGRP) && (mode & S_IXOTH))
1597 masks->deny2 |= execute_mask;
1598
1599 masks->allow0 = 0;
1600 if ((mode & S_IRUSR) && (!(mode & S_IRGRP) && (mode & S_IROTH)))
1601 masks->allow0 |= read_mask;
1602 if ((mode & S_IWUSR) && (!(mode & S_IWGRP) && (mode & S_IWOTH)))
1603 masks->allow0 |= write_mask;
1604 if ((mode & S_IXUSR) && (!(mode & S_IXGRP) && (mode & S_IXOTH)))
1605 masks->allow0 |= execute_mask;
1606
1607 masks->owner = ACE_WRITE_ATTRIBUTES|ACE_WRITE_OWNER|ACE_WRITE_ACL|
1608 ACE_WRITE_NAMED_ATTRS|ACE_READ_ACL|ACE_READ_ATTRIBUTES|
1609 ACE_READ_NAMED_ATTRS|ACE_SYNCHRONIZE;
1610 if (mode & S_IRUSR)
1611 masks->owner |= read_mask;
1612 if (mode & S_IWUSR)
1613 masks->owner |= write_mask;
1614 if (mode & S_IXUSR)
1615 masks->owner |= execute_mask;
1616
1617 masks->group = ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_READ_NAMED_ATTRS|
1618 ACE_SYNCHRONIZE;
1619 if (mode & S_IRGRP)
1620 masks->group |= read_mask;
1621 if (mode & S_IWGRP)
1622 masks->group |= write_mask;
1623 if (mode & S_IXGRP)
1624 masks->group |= execute_mask;
1625
1626 masks->everyone = ACE_READ_ACL|ACE_READ_ATTRIBUTES|ACE_READ_NAMED_ATTRS|
1627 ACE_SYNCHRONIZE;
1628 if (mode & S_IROTH)
1629 masks->everyone |= read_mask;
1630 if (mode & S_IWOTH)
1631 masks->everyone |= write_mask;
1632 if (mode & S_IXOTH)
1633 masks->everyone |= execute_mask;
1634 }
1635
1636 int
1637 acl_trivial_create(mode_t mode, boolean_t isdir, ace_t **acl, int *count)
1638 {
1639 int index = 0;
1640 int error;
1641 trivial_acl_t masks;
1642
1643 *count = 3;
1644 acl_trivial_access_masks(mode, isdir, &masks);
1645
1646 if (masks.allow0)
1647 (*count)++;
1648 if (masks.deny1)
1649 (*count)++;
1650 if (masks.deny2)
1651 (*count)++;
1652
1653 if ((error = cacl_malloc((void **)acl, *count * sizeof (ace_t))) != 0)
1654 return (error);
1655
1656 if (masks.allow0) {
1657 SET_ACE(acl, index, -1, masks.allow0,
1658 ACE_ACCESS_ALLOWED_ACE_TYPE, ACE_OWNER);
1659 }
1660 if (masks.deny1) {
1661 SET_ACE(acl, index, -1, masks.deny1,
1662 ACE_ACCESS_DENIED_ACE_TYPE, ACE_OWNER);
1663 }
1664 if (masks.deny2) {
1665 SET_ACE(acl, index, -1, masks.deny2,
1666 ACE_ACCESS_DENIED_ACE_TYPE, ACE_GROUP|ACE_IDENTIFIER_GROUP);
1667 }
1668
1669 SET_ACE(acl, index, -1, masks.owner, ACE_ACCESS_ALLOWED_ACE_TYPE,
1670 ACE_OWNER);
1671 SET_ACE(acl, index, -1, masks.group, ACE_ACCESS_ALLOWED_ACE_TYPE,
1672 ACE_IDENTIFIER_GROUP|ACE_GROUP);
1673 SET_ACE(acl, index, -1, masks.everyone, ACE_ACCESS_ALLOWED_ACE_TYPE,
1674 ACE_EVERYONE);
1675
1676 return (0);
1677 }
1678
1679 /*
1680 * ace_trivial:
1681 * determine whether an ace_t acl is trivial
1682 *
1683 * Trivialness implies that the acl is composed of only
1684 * owner, group, everyone entries. ACL can't
1685 * have read_acl denied, and write_owner/write_acl/write_attributes
1686 * can only be owner@ entry.
1687 */
1688 int
1689 ace_trivial_common(void *acep, int aclcnt,
1690 uint64_t (*walk)(void *, uint64_t, int aclcnt,
1691 uint16_t *, uint16_t *, uint32_t *))
1692 {
1693 uint16_t flags;
1694 uint32_t mask;
1695 uint16_t type;
1696 uint64_t cookie = 0;
1697
1698 while (cookie = walk(acep, cookie, aclcnt, &flags, &type, &mask)) {
1699 switch (flags & ACE_TYPE_FLAGS) {
1700 case ACE_OWNER:
1701 case ACE_GROUP|ACE_IDENTIFIER_GROUP:
1702 case ACE_EVERYONE:
1703 break;
1704 default:
1705 return (1);
1706
1707 }
1708
1709 if (flags & (ACE_FILE_INHERIT_ACE|
1710 ACE_DIRECTORY_INHERIT_ACE|ACE_NO_PROPAGATE_INHERIT_ACE|
1711 ACE_INHERIT_ONLY_ACE))
1712 return (1);
1713
1714 /*
1715 * Special check for some special bits
1716 *
1717 * Don't allow anybody to deny reading basic
1718 * attributes or a files ACL.
1719 */
1720 if ((mask & (ACE_READ_ACL|ACE_READ_ATTRIBUTES)) &&
1721 (type == ACE_ACCESS_DENIED_ACE_TYPE))
1722 return (1);
1723
1724 /*
1725 * Delete permission is never set by default
1726 */
1727 if (mask & ACE_DELETE)
1728 return (1);
1729
1730 /*
1731 * Child delete permission should be accompanied by write
1732 */
1733 if ((mask & ACE_DELETE_CHILD) && !(mask & ACE_WRITE_DATA))
1734 return (1);
1735
1736 /*
1737 * only allow owner@ to have
1738 * write_acl/write_owner/write_attributes/write_xattr/
1739 */
1740 if (type == ACE_ACCESS_ALLOWED_ACE_TYPE &&
1741 (!(flags & ACE_OWNER) && (mask &
1742 (ACE_WRITE_OWNER|ACE_WRITE_ACL| ACE_WRITE_ATTRIBUTES|
1743 ACE_WRITE_NAMED_ATTRS))))
1744 return (1);
1745
1746 }
1747 return (0);
1748 }
1749
1750 uint64_t
1751 ace_walk(void *datap, uint64_t cookie, int aclcnt, uint16_t *flags,
1752 uint16_t *type, uint32_t *mask)
1753 {
1754 ace_t *acep = datap;
1755
1756 if (cookie >= aclcnt)
1757 return (0);
1758
1759 *flags = acep[cookie].a_flags;
1760 *type = acep[cookie].a_type;
1761 *mask = acep[cookie++].a_access_mask;
1762
1763 return (cookie);
1764 }
1765
1766 int
1767 ace_trivial(ace_t *acep, int aclcnt)
1768 {
1769 return (ace_trivial_common(acep, aclcnt, ace_walk));
1770 }
Unleashed OS