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 https://opensource.org/licenses/CDDL-1.0.
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) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2011, 2015 by Delphix. All rights reserved.
24 */
25
26 /*
27 * DSL permissions are stored in a two level zap attribute
28 * mechanism. The first level identifies the "class" of
29 * entry. The class is identified by the first 2 letters of
30 * the attribute. The second letter "l" or "d" identifies whether
31 * it is a local or descendent permission. The first letter
32 * identifies the type of entry.
33 *
34 * ul$<id> identifies permissions granted locally for this userid.
35 * ud$<id> identifies permissions granted on descendent datasets for
36 * this userid.
37 * Ul$<id> identifies permission sets granted locally for this userid.
38 * Ud$<id> identifies permission sets granted on descendent datasets for
39 * this userid.
40 * gl$<id> identifies permissions granted locally for this groupid.
41 * gd$<id> identifies permissions granted on descendent datasets for
42 * this groupid.
43 * Gl$<id> identifies permission sets granted locally for this groupid.
44 * Gd$<id> identifies permission sets granted on descendent datasets for
45 * this groupid.
46 * el$ identifies permissions granted locally for everyone.
47 * ed$ identifies permissions granted on descendent datasets
48 * for everyone.
49 * El$ identifies permission sets granted locally for everyone.
50 * Ed$ identifies permission sets granted to descendent datasets for
51 * everyone.
52 * c-$ identifies permission to create at dataset creation time.
53 * C-$ identifies permission sets to grant locally at dataset creation
54 * time.
55 * s-$@<name> permissions defined in specified set @<name>
56 * S-$@<name> Sets defined in named set @<name>
57 *
58 * Each of the above entities points to another zap attribute that contains one
59 * attribute for each allowed permission, such as create, destroy,...
60 * All of the "upper" case class types will specify permission set names
61 * rather than permissions.
62 *
63 * Basically it looks something like this:
64 * ul$12 -> ZAP OBJ -> permissions...
65 *
66 * The ZAP OBJ is referred to as the jump object.
67 */
68
69 #include <sys/dmu.h>
70 #include <sys/dmu_objset.h>
71 #include <sys/dmu_tx.h>
72 #include <sys/dsl_dataset.h>
73 #include <sys/dsl_dir.h>
74 #include <sys/dsl_prop.h>
75 #include <sys/dsl_synctask.h>
76 #include <sys/dsl_deleg.h>
77 #include <sys/spa.h>
78 #include <sys/zap.h>
79 #include <sys/fs/zfs.h>
80 #include <sys/cred.h>
81 #include <sys/sunddi.h>
82
83 #include "zfs_deleg.h"
84
85 /*
86 * Validate that user is allowed to delegate specified permissions.
87 *
88 * In order to delegate "create" you must have "create"
89 * and "allow".
90 */
91 int
dsl_deleg_can_allow(char * ddname,nvlist_t * nvp,cred_t * cr)92 dsl_deleg_can_allow(char *ddname, nvlist_t *nvp, cred_t *cr)
93 {
94 nvpair_t *whopair = NULL;
95 int error;
96
97 if ((error = dsl_deleg_access(ddname, ZFS_DELEG_PERM_ALLOW, cr)) != 0)
98 return (error);
99
100 while ((whopair = nvlist_next_nvpair(nvp, whopair))) {
101 nvlist_t *perms;
102 nvpair_t *permpair = NULL;
103
104 VERIFY(nvpair_value_nvlist(whopair, &perms) == 0);
105
106 while ((permpair = nvlist_next_nvpair(perms, permpair))) {
107 const char *perm = nvpair_name(permpair);
108
109 if (strcmp(perm, ZFS_DELEG_PERM_ALLOW) == 0)
110 return (SET_ERROR(EPERM));
111
112 if ((error = dsl_deleg_access(ddname, perm, cr)) != 0)
113 return (error);
114 }
115 }
116 return (0);
117 }
118
119 /*
120 * Validate that user is allowed to unallow specified permissions. They
121 * must have the 'allow' permission, and even then can only unallow
122 * perms for their uid.
123 */
124 int
dsl_deleg_can_unallow(char * ddname,nvlist_t * nvp,cred_t * cr)125 dsl_deleg_can_unallow(char *ddname, nvlist_t *nvp, cred_t *cr)
126 {
127 nvpair_t *whopair = NULL;
128 int error;
129 char idstr[32];
130
131 if ((error = dsl_deleg_access(ddname, ZFS_DELEG_PERM_ALLOW, cr)) != 0)
132 return (error);
133
134 (void) snprintf(idstr, sizeof (idstr), "%lld",
135 (longlong_t)crgetuid(cr));
136
137 while ((whopair = nvlist_next_nvpair(nvp, whopair))) {
138 zfs_deleg_who_type_t type = nvpair_name(whopair)[0];
139
140 if (type != ZFS_DELEG_USER &&
141 type != ZFS_DELEG_USER_SETS)
142 return (SET_ERROR(EPERM));
143
144 if (strcmp(idstr, &nvpair_name(whopair)[3]) != 0)
145 return (SET_ERROR(EPERM));
146 }
147 return (0);
148 }
149
150 typedef struct dsl_deleg_arg {
151 const char *dda_name;
152 nvlist_t *dda_nvlist;
153 } dsl_deleg_arg_t;
154
155 static void
dsl_deleg_set_sync(void * arg,dmu_tx_t * tx)156 dsl_deleg_set_sync(void *arg, dmu_tx_t *tx)
157 {
158 dsl_deleg_arg_t *dda = arg;
159 dsl_dir_t *dd;
160 dsl_pool_t *dp = dmu_tx_pool(tx);
161 objset_t *mos = dp->dp_meta_objset;
162 nvpair_t *whopair = NULL;
163 uint64_t zapobj;
164
165 VERIFY0(dsl_dir_hold(dp, dda->dda_name, FTAG, &dd, NULL));
166
167 zapobj = dsl_dir_phys(dd)->dd_deleg_zapobj;
168 if (zapobj == 0) {
169 dmu_buf_will_dirty(dd->dd_dbuf, tx);
170 zapobj = dsl_dir_phys(dd)->dd_deleg_zapobj = zap_create(mos,
171 DMU_OT_DSL_PERMS, DMU_OT_NONE, 0, tx);
172 }
173
174 while ((whopair = nvlist_next_nvpair(dda->dda_nvlist, whopair))) {
175 const char *whokey = nvpair_name(whopair);
176 nvlist_t *perms;
177 nvpair_t *permpair = NULL;
178 uint64_t jumpobj;
179
180 perms = fnvpair_value_nvlist(whopair);
181
182 if (zap_lookup(mos, zapobj, whokey, 8, 1, &jumpobj) != 0) {
183 jumpobj = zap_create_link(mos, DMU_OT_DSL_PERMS,
184 zapobj, whokey, tx);
185 }
186
187 while ((permpair = nvlist_next_nvpair(perms, permpair))) {
188 const char *perm = nvpair_name(permpair);
189 uint64_t n = 0;
190
191 VERIFY(zap_update(mos, jumpobj,
192 perm, 8, 1, &n, tx) == 0);
193 spa_history_log_internal_dd(dd, "permission update", tx,
194 "%s %s", whokey, perm);
195 }
196 }
197 dsl_dir_rele(dd, FTAG);
198 }
199
200 static void
dsl_deleg_unset_sync(void * arg,dmu_tx_t * tx)201 dsl_deleg_unset_sync(void *arg, dmu_tx_t *tx)
202 {
203 dsl_deleg_arg_t *dda = arg;
204 dsl_dir_t *dd;
205 dsl_pool_t *dp = dmu_tx_pool(tx);
206 objset_t *mos = dp->dp_meta_objset;
207 nvpair_t *whopair = NULL;
208 uint64_t zapobj;
209
210 VERIFY0(dsl_dir_hold(dp, dda->dda_name, FTAG, &dd, NULL));
211 zapobj = dsl_dir_phys(dd)->dd_deleg_zapobj;
212 if (zapobj == 0) {
213 dsl_dir_rele(dd, FTAG);
214 return;
215 }
216
217 while ((whopair = nvlist_next_nvpair(dda->dda_nvlist, whopair))) {
218 const char *whokey = nvpair_name(whopair);
219 nvlist_t *perms;
220 nvpair_t *permpair = NULL;
221 uint64_t jumpobj;
222
223 if (nvpair_value_nvlist(whopair, &perms) != 0) {
224 if (zap_lookup(mos, zapobj, whokey, 8,
225 1, &jumpobj) == 0) {
226 (void) zap_remove(mos, zapobj, whokey, tx);
227 VERIFY(0 == zap_destroy(mos, jumpobj, tx));
228 }
229 spa_history_log_internal_dd(dd, "permission who remove",
230 tx, "%s", whokey);
231 continue;
232 }
233
234 if (zap_lookup(mos, zapobj, whokey, 8, 1, &jumpobj) != 0)
235 continue;
236
237 while ((permpair = nvlist_next_nvpair(perms, permpair))) {
238 const char *perm = nvpair_name(permpair);
239 uint64_t n = 0;
240
241 (void) zap_remove(mos, jumpobj, perm, tx);
242 if (zap_count(mos, jumpobj, &n) == 0 && n == 0) {
243 (void) zap_remove(mos, zapobj,
244 whokey, tx);
245 VERIFY(0 == zap_destroy(mos,
246 jumpobj, tx));
247 }
248 spa_history_log_internal_dd(dd, "permission remove", tx,
249 "%s %s", whokey, perm);
250 }
251 }
252 dsl_dir_rele(dd, FTAG);
253 }
254
255 static int
dsl_deleg_check(void * arg,dmu_tx_t * tx)256 dsl_deleg_check(void *arg, dmu_tx_t *tx)
257 {
258 dsl_deleg_arg_t *dda = arg;
259 dsl_dir_t *dd;
260 int error;
261
262 if (spa_version(dmu_tx_pool(tx)->dp_spa) <
263 SPA_VERSION_DELEGATED_PERMS) {
264 return (SET_ERROR(ENOTSUP));
265 }
266
267 error = dsl_dir_hold(dmu_tx_pool(tx), dda->dda_name, FTAG, &dd, NULL);
268 if (error == 0)
269 dsl_dir_rele(dd, FTAG);
270 return (error);
271 }
272
273 int
dsl_deleg_set(const char * ddname,nvlist_t * nvp,boolean_t unset)274 dsl_deleg_set(const char *ddname, nvlist_t *nvp, boolean_t unset)
275 {
276 dsl_deleg_arg_t dda;
277
278 /* nvp must already have been verified to be valid */
279
280 dda.dda_name = ddname;
281 dda.dda_nvlist = nvp;
282
283 return (dsl_sync_task(ddname, dsl_deleg_check,
284 unset ? dsl_deleg_unset_sync : dsl_deleg_set_sync,
285 &dda, fnvlist_num_pairs(nvp), ZFS_SPACE_CHECK_RESERVED));
286 }
287
288 /*
289 * Find all 'allow' permissions from a given point and then continue
290 * traversing up to the root.
291 *
292 * This function constructs an nvlist of nvlists.
293 * each setpoint is an nvlist composed of an nvlist of an nvlist
294 * of the individual * users/groups/everyone/create
295 * permissions.
296 *
297 * The nvlist will look like this.
298 *
299 * { source fsname -> { whokeys { permissions,...}, ...}}
300 *
301 * The fsname nvpairs will be arranged in a bottom up order. For example,
302 * if we have the following structure a/b/c then the nvpairs for the fsnames
303 * will be ordered a/b/c, a/b, a.
304 */
305 int
dsl_deleg_get(const char * ddname,nvlist_t ** nvp)306 dsl_deleg_get(const char *ddname, nvlist_t **nvp)
307 {
308 dsl_dir_t *dd, *startdd;
309 dsl_pool_t *dp;
310 int error;
311 objset_t *mos;
312 zap_cursor_t *basezc, *zc;
313 zap_attribute_t *baseza, *za;
314 char *source;
315
316 error = dsl_pool_hold(ddname, FTAG, &dp);
317 if (error != 0)
318 return (error);
319
320 error = dsl_dir_hold(dp, ddname, FTAG, &startdd, NULL);
321 if (error != 0) {
322 dsl_pool_rele(dp, FTAG);
323 return (error);
324 }
325
326 dp = startdd->dd_pool;
327 mos = dp->dp_meta_objset;
328
329 zc = kmem_alloc(sizeof (zap_cursor_t), KM_SLEEP);
330 za = zap_attribute_alloc();
331 basezc = kmem_alloc(sizeof (zap_cursor_t), KM_SLEEP);
332 baseza = zap_attribute_alloc();
333 source = kmem_alloc(ZFS_MAX_DATASET_NAME_LEN, KM_SLEEP);
334 VERIFY(nvlist_alloc(nvp, NV_UNIQUE_NAME, KM_SLEEP) == 0);
335
336 for (dd = startdd; dd != NULL; dd = dd->dd_parent) {
337 nvlist_t *sp_nvp;
338 uint64_t n;
339
340 if (dsl_dir_phys(dd)->dd_deleg_zapobj == 0 ||
341 zap_count(mos,
342 dsl_dir_phys(dd)->dd_deleg_zapobj, &n) != 0 || n == 0)
343 continue;
344
345 sp_nvp = fnvlist_alloc();
346 for (zap_cursor_init(basezc, mos,
347 dsl_dir_phys(dd)->dd_deleg_zapobj);
348 zap_cursor_retrieve(basezc, baseza) == 0;
349 zap_cursor_advance(basezc)) {
350 nvlist_t *perms_nvp;
351
352 ASSERT(baseza->za_integer_length == 8);
353 ASSERT(baseza->za_num_integers == 1);
354
355 perms_nvp = fnvlist_alloc();
356 for (zap_cursor_init(zc, mos, baseza->za_first_integer);
357 zap_cursor_retrieve(zc, za) == 0;
358 zap_cursor_advance(zc)) {
359 fnvlist_add_boolean(perms_nvp, za->za_name);
360 }
361 zap_cursor_fini(zc);
362 fnvlist_add_nvlist(sp_nvp, baseza->za_name, perms_nvp);
363 fnvlist_free(perms_nvp);
364 }
365
366 zap_cursor_fini(basezc);
367
368 dsl_dir_name(dd, source);
369 fnvlist_add_nvlist(*nvp, source, sp_nvp);
370 nvlist_free(sp_nvp);
371 }
372
373 kmem_free(source, ZFS_MAX_DATASET_NAME_LEN);
374 zap_attribute_free(baseza);
375 kmem_free(basezc, sizeof (zap_cursor_t));
376 zap_attribute_free(za);
377 kmem_free(zc, sizeof (zap_cursor_t));
378
379 dsl_dir_rele(startdd, FTAG);
380 dsl_pool_rele(dp, FTAG);
381 return (0);
382 }
383
384 /*
385 * Routines for dsl_deleg_access() -- access checking.
386 */
387 typedef struct perm_set {
388 avl_node_t p_node;
389 boolean_t p_matched;
390 char p_setname[ZFS_MAX_DELEG_NAME];
391 } perm_set_t;
392
393 static int
perm_set_compare(const void * arg1,const void * arg2)394 perm_set_compare(const void *arg1, const void *arg2)
395 {
396 const perm_set_t *node1 = (const perm_set_t *)arg1;
397 const perm_set_t *node2 = (const perm_set_t *)arg2;
398 int val;
399
400 val = strcmp(node1->p_setname, node2->p_setname);
401
402 return (TREE_ISIGN(val));
403 }
404
405 /*
406 * Determine whether a specified permission exists.
407 *
408 * First the base attribute has to be retrieved. i.e. ul$12
409 * Once the base object has been retrieved the actual permission
410 * is lookup up in the zap object the base object points to.
411 *
412 * Return 0 if permission exists, ENOENT if there is no whokey, EPERM if
413 * there is no perm in that jumpobj.
414 */
415 static int
dsl_check_access(objset_t * mos,uint64_t zapobj,char type,char checkflag,void * valp,const char * perm)416 dsl_check_access(objset_t *mos, uint64_t zapobj,
417 char type, char checkflag, void *valp, const char *perm)
418 {
419 int error;
420 uint64_t jumpobj, zero;
421 char whokey[ZFS_MAX_DELEG_NAME];
422
423 zfs_deleg_whokey(whokey, type, checkflag, valp);
424 error = zap_lookup(mos, zapobj, whokey, 8, 1, &jumpobj);
425 if (error == 0) {
426 error = zap_lookup(mos, jumpobj, perm, 8, 1, &zero);
427 if (error == ENOENT)
428 error = SET_ERROR(EPERM);
429 }
430 return (error);
431 }
432
433 /*
434 * check a specified user/group for a requested permission
435 */
436 static int
dsl_check_user_access(objset_t * mos,uint64_t zapobj,const char * perm,int checkflag,cred_t * cr)437 dsl_check_user_access(objset_t *mos, uint64_t zapobj, const char *perm,
438 int checkflag, cred_t *cr)
439 {
440 const gid_t *gids;
441 int ngids;
442 int i;
443 uint64_t id;
444
445 /* check for user */
446 id = crgetuid(cr);
447 if (dsl_check_access(mos, zapobj,
448 ZFS_DELEG_USER, checkflag, &id, perm) == 0)
449 return (0);
450
451 /* check for users primary group */
452 id = crgetgid(cr);
453 if (dsl_check_access(mos, zapobj,
454 ZFS_DELEG_GROUP, checkflag, &id, perm) == 0)
455 return (0);
456
457 /* check for everyone entry */
458 id = -1;
459 if (dsl_check_access(mos, zapobj,
460 ZFS_DELEG_EVERYONE, checkflag, &id, perm) == 0)
461 return (0);
462
463 /* check each supplemental group user is a member of */
464 ngids = crgetngroups(cr);
465 gids = crgetgroups(cr);
466 for (i = 0; i != ngids; i++) {
467 id = gids[i];
468 if (dsl_check_access(mos, zapobj,
469 ZFS_DELEG_GROUP, checkflag, &id, perm) == 0)
470 return (0);
471 }
472
473 return (SET_ERROR(EPERM));
474 }
475
476 /*
477 * Iterate over the sets specified in the specified zapobj
478 * and load them into the permsets avl tree.
479 */
480 static int
dsl_load_sets(objset_t * mos,uint64_t zapobj,char type,char checkflag,void * valp,avl_tree_t * avl)481 dsl_load_sets(objset_t *mos, uint64_t zapobj,
482 char type, char checkflag, void *valp, avl_tree_t *avl)
483 {
484 zap_cursor_t zc;
485 zap_attribute_t *za;
486 perm_set_t *permnode;
487 avl_index_t idx;
488 uint64_t jumpobj;
489 int error;
490 char whokey[ZFS_MAX_DELEG_NAME];
491
492 zfs_deleg_whokey(whokey, type, checkflag, valp);
493
494 error = zap_lookup(mos, zapobj, whokey, 8, 1, &jumpobj);
495 if (error != 0)
496 return (error);
497
498 za = zap_attribute_alloc();
499 for (zap_cursor_init(&zc, mos, jumpobj);
500 zap_cursor_retrieve(&zc, za) == 0;
501 zap_cursor_advance(&zc)) {
502 permnode = kmem_alloc(sizeof (perm_set_t), KM_SLEEP);
503 (void) strlcpy(permnode->p_setname, za->za_name,
504 sizeof (permnode->p_setname));
505 permnode->p_matched = B_FALSE;
506
507 if (avl_find(avl, permnode, &idx) == NULL) {
508 avl_insert(avl, permnode, idx);
509 } else {
510 kmem_free(permnode, sizeof (perm_set_t));
511 }
512 }
513 zap_cursor_fini(&zc);
514 zap_attribute_free(za);
515 return (0);
516 }
517
518 /*
519 * Load all permissions user based on cred belongs to.
520 */
521 static void
dsl_load_user_sets(objset_t * mos,uint64_t zapobj,avl_tree_t * avl,char checkflag,cred_t * cr)522 dsl_load_user_sets(objset_t *mos, uint64_t zapobj, avl_tree_t *avl,
523 char checkflag, cred_t *cr)
524 {
525 const gid_t *gids;
526 int ngids, i;
527 uint64_t id;
528
529 id = crgetuid(cr);
530 (void) dsl_load_sets(mos, zapobj,
531 ZFS_DELEG_USER_SETS, checkflag, &id, avl);
532
533 id = crgetgid(cr);
534 (void) dsl_load_sets(mos, zapobj,
535 ZFS_DELEG_GROUP_SETS, checkflag, &id, avl);
536
537 (void) dsl_load_sets(mos, zapobj,
538 ZFS_DELEG_EVERYONE_SETS, checkflag, NULL, avl);
539
540 ngids = crgetngroups(cr);
541 gids = crgetgroups(cr);
542 for (i = 0; i != ngids; i++) {
543 id = gids[i];
544 (void) dsl_load_sets(mos, zapobj,
545 ZFS_DELEG_GROUP_SETS, checkflag, &id, avl);
546 }
547 }
548
549 /*
550 * Check if user has requested permission.
551 */
552 int
dsl_deleg_access_impl(dsl_dataset_t * ds,const char * perm,cred_t * cr)553 dsl_deleg_access_impl(dsl_dataset_t *ds, const char *perm, cred_t *cr)
554 {
555 dsl_dir_t *dd;
556 dsl_pool_t *dp;
557 void *cookie;
558 int error;
559 char checkflag;
560 objset_t *mos;
561 avl_tree_t permsets;
562 perm_set_t *setnode;
563
564 dp = ds->ds_dir->dd_pool;
565 mos = dp->dp_meta_objset;
566
567 if (dsl_delegation_on(mos) == B_FALSE)
568 return (SET_ERROR(ECANCELED));
569
570 if (spa_version(dmu_objset_spa(dp->dp_meta_objset)) <
571 SPA_VERSION_DELEGATED_PERMS)
572 return (SET_ERROR(EPERM));
573
574 if (ds->ds_is_snapshot) {
575 /*
576 * Snapshots are treated as descendents only,
577 * local permissions do not apply.
578 */
579 checkflag = ZFS_DELEG_DESCENDENT;
580 } else {
581 checkflag = ZFS_DELEG_LOCAL;
582 }
583
584 avl_create(&permsets, perm_set_compare, sizeof (perm_set_t),
585 offsetof(perm_set_t, p_node));
586
587 ASSERT(dsl_pool_config_held(dp));
588 for (dd = ds->ds_dir; dd != NULL; dd = dd->dd_parent,
589 checkflag = ZFS_DELEG_DESCENDENT) {
590 uint64_t zapobj;
591 boolean_t expanded;
592
593 /*
594 * If not in global zone then make sure
595 * the zoned property is set
596 */
597 if (!INGLOBALZONE(curproc)) {
598 uint64_t zoned;
599
600 if (dsl_prop_get_dd(dd,
601 zfs_prop_to_name(ZFS_PROP_ZONED),
602 8, 1, &zoned, NULL, B_FALSE) != 0)
603 break;
604 if (!zoned)
605 break;
606 }
607 zapobj = dsl_dir_phys(dd)->dd_deleg_zapobj;
608
609 if (zapobj == 0)
610 continue;
611
612 dsl_load_user_sets(mos, zapobj, &permsets, checkflag, cr);
613 again:
614 expanded = B_FALSE;
615 for (setnode = avl_first(&permsets); setnode;
616 setnode = AVL_NEXT(&permsets, setnode)) {
617 if (setnode->p_matched == B_TRUE)
618 continue;
619
620 /* See if this set directly grants this permission */
621 error = dsl_check_access(mos, zapobj,
622 ZFS_DELEG_NAMED_SET, 0, setnode->p_setname, perm);
623 if (error == 0)
624 goto success;
625 if (error == EPERM)
626 setnode->p_matched = B_TRUE;
627
628 /* See if this set includes other sets */
629 error = dsl_load_sets(mos, zapobj,
630 ZFS_DELEG_NAMED_SET_SETS, 0,
631 setnode->p_setname, &permsets);
632 if (error == 0)
633 setnode->p_matched = expanded = B_TRUE;
634 }
635 /*
636 * If we expanded any sets, that will define more sets,
637 * which we need to check.
638 */
639 if (expanded)
640 goto again;
641
642 error = dsl_check_user_access(mos, zapobj, perm, checkflag, cr);
643 if (error == 0)
644 goto success;
645 }
646 error = SET_ERROR(EPERM);
647 success:
648
649 cookie = NULL;
650 while ((setnode = avl_destroy_nodes(&permsets, &cookie)) != NULL)
651 kmem_free(setnode, sizeof (perm_set_t));
652
653 return (error);
654 }
655
656 int
dsl_deleg_access(const char * dsname,const char * perm,cred_t * cr)657 dsl_deleg_access(const char *dsname, const char *perm, cred_t *cr)
658 {
659 dsl_pool_t *dp;
660 dsl_dataset_t *ds;
661 int error;
662
663 error = dsl_pool_hold(dsname, FTAG, &dp);
664 if (error != 0)
665 return (error);
666 error = dsl_dataset_hold(dp, dsname, FTAG, &ds);
667 if (error == 0) {
668 error = dsl_deleg_access_impl(ds, perm, cr);
669 dsl_dataset_rele(ds, FTAG);
670 }
671 dsl_pool_rele(dp, FTAG);
672
673 return (error);
674 }
675
676 /*
677 * Other routines.
678 */
679
680 static void
copy_create_perms(dsl_dir_t * dd,uint64_t pzapobj,boolean_t dosets,uint64_t uid,dmu_tx_t * tx)681 copy_create_perms(dsl_dir_t *dd, uint64_t pzapobj,
682 boolean_t dosets, uint64_t uid, dmu_tx_t *tx)
683 {
684 objset_t *mos = dd->dd_pool->dp_meta_objset;
685 uint64_t jumpobj, pjumpobj;
686 uint64_t zapobj = dsl_dir_phys(dd)->dd_deleg_zapobj;
687 zap_cursor_t zc;
688 zap_attribute_t *za;
689 char whokey[ZFS_MAX_DELEG_NAME];
690
691 zfs_deleg_whokey(whokey,
692 dosets ? ZFS_DELEG_CREATE_SETS : ZFS_DELEG_CREATE,
693 ZFS_DELEG_LOCAL, NULL);
694 if (zap_lookup(mos, pzapobj, whokey, 8, 1, &pjumpobj) != 0)
695 return;
696
697 if (zapobj == 0) {
698 dmu_buf_will_dirty(dd->dd_dbuf, tx);
699 zapobj = dsl_dir_phys(dd)->dd_deleg_zapobj = zap_create(mos,
700 DMU_OT_DSL_PERMS, DMU_OT_NONE, 0, tx);
701 }
702
703 zfs_deleg_whokey(whokey,
704 dosets ? ZFS_DELEG_USER_SETS : ZFS_DELEG_USER,
705 ZFS_DELEG_LOCAL, &uid);
706 if (zap_lookup(mos, zapobj, whokey, 8, 1, &jumpobj) == ENOENT) {
707 jumpobj = zap_create(mos, DMU_OT_DSL_PERMS, DMU_OT_NONE, 0, tx);
708 VERIFY(zap_add(mos, zapobj, whokey, 8, 1, &jumpobj, tx) == 0);
709 }
710
711 za = zap_attribute_alloc();
712 for (zap_cursor_init(&zc, mos, pjumpobj);
713 zap_cursor_retrieve(&zc, za) == 0;
714 zap_cursor_advance(&zc)) {
715 uint64_t zero = 0;
716 ASSERT(za->za_integer_length == 8 && za->za_num_integers == 1);
717
718 VERIFY(zap_update(mos, jumpobj, za->za_name,
719 8, 1, &zero, tx) == 0);
720 }
721 zap_cursor_fini(&zc);
722 zap_attribute_free(za);
723 }
724
725 /*
726 * set all create time permission on new dataset.
727 */
728 void
dsl_deleg_set_create_perms(dsl_dir_t * sdd,dmu_tx_t * tx,cred_t * cr)729 dsl_deleg_set_create_perms(dsl_dir_t *sdd, dmu_tx_t *tx, cred_t *cr)
730 {
731 dsl_dir_t *dd;
732 uint64_t uid = crgetuid(cr);
733
734 if (spa_version(dmu_objset_spa(sdd->dd_pool->dp_meta_objset)) <
735 SPA_VERSION_DELEGATED_PERMS)
736 return;
737
738 for (dd = sdd->dd_parent; dd != NULL; dd = dd->dd_parent) {
739 uint64_t pzapobj = dsl_dir_phys(dd)->dd_deleg_zapobj;
740
741 if (pzapobj == 0)
742 continue;
743
744 copy_create_perms(sdd, pzapobj, B_FALSE, uid, tx);
745 copy_create_perms(sdd, pzapobj, B_TRUE, uid, tx);
746 }
747 }
748
749 int
dsl_deleg_destroy(objset_t * mos,uint64_t zapobj,dmu_tx_t * tx)750 dsl_deleg_destroy(objset_t *mos, uint64_t zapobj, dmu_tx_t *tx)
751 {
752 zap_cursor_t zc;
753 zap_attribute_t *za;
754
755 if (zapobj == 0)
756 return (0);
757
758 za = zap_attribute_alloc();
759 for (zap_cursor_init(&zc, mos, zapobj);
760 zap_cursor_retrieve(&zc, za) == 0;
761 zap_cursor_advance(&zc)) {
762 ASSERT(za->za_integer_length == 8 && za->za_num_integers == 1);
763 VERIFY(0 == zap_destroy(mos, za->za_first_integer, tx));
764 }
765 zap_cursor_fini(&zc);
766 VERIFY(0 == zap_destroy(mos, zapobj, tx));
767 zap_attribute_free(za);
768 return (0);
769 }
770
771 boolean_t
dsl_delegation_on(objset_t * os)772 dsl_delegation_on(objset_t *os)
773 {
774 return (!!spa_delegation(os->os_spa));
775 }
776
777 #if defined(_KERNEL)
778 EXPORT_SYMBOL(dsl_deleg_get);
779 EXPORT_SYMBOL(dsl_deleg_set);
780 #endif
781