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.
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.
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]
22 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2011, 2015 by Delphix. All rights reserved.
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.
34 * ul$<id> identifies permissions granted locally for this userid.
35 * ud$<id> identifies permissions granted on descendent datasets for
37 * Ul$<id> identifies permission sets granted locally for this userid.
38 * Ud$<id> identifies permission sets granted on descendent datasets for
40 * gl$<id> identifies permissions granted locally for this groupid.
41 * gd$<id> identifies permissions granted on descendent datasets for
43 * Gl$<id> identifies permission sets granted locally for this groupid.
44 * Gd$<id> identifies permission sets granted on descendent datasets for
46 * el$ identifies permissions granted locally for everyone.
47 * ed$ identifies permissions granted on descendent datasets
49 * El$ identifies permission sets granted locally for everyone.
50 * Ed$ identifies permission sets granted to descendent datasets for
52 * c-$ identifies permission to create at dataset creation time.
53 * C-$ identifies permission sets to grant locally at dataset creation
55 * s-$@<name> permissions defined in specified set @<name>
56 * S-$@<name> Sets defined in named set @<name>
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.
63 * Basically it looks something like this:
64 * ul$12 -> ZAP OBJ -> permissions...
66 * The ZAP OBJ is referred to as the jump object.
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>
79 #include <sys/fs/zfs.h>
81 #include <sys/sunddi.h>
83 #include "zfs_deleg.h"
86 * Validate that user is allowed to delegate specified permissions.
88 * In order to delegate "create" you must have "create"
92 dsl_deleg_can_allow(char *ddname, nvlist_t *nvp, cred_t *cr)
94 nvpair_t *whopair = NULL;
97 if ((error = dsl_deleg_access(ddname, ZFS_DELEG_PERM_ALLOW, cr)) != 0)
100 while ((whopair = nvlist_next_nvpair(nvp, whopair))) {
102 nvpair_t *permpair = NULL;
104 VERIFY(nvpair_value_nvlist(whopair, &perms) == 0);
106 while ((permpair = nvlist_next_nvpair(perms, permpair))) {
107 const char *perm = nvpair_name(permpair);
109 if (strcmp(perm, ZFS_DELEG_PERM_ALLOW) == 0)
110 return (SET_ERROR(EPERM));
112 if ((error = dsl_deleg_access(ddname, perm, cr)) != 0)
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.
125 dsl_deleg_can_unallow(char *ddname, nvlist_t *nvp, cred_t *cr)
127 nvpair_t *whopair = NULL;
131 if ((error = dsl_deleg_access(ddname, ZFS_DELEG_PERM_ALLOW, cr)) != 0)
134 (void) snprintf(idstr, sizeof (idstr), "%lld",
135 (longlong_t)crgetuid(cr));
137 while ((whopair = nvlist_next_nvpair(nvp, whopair))) {
138 zfs_deleg_who_type_t type = nvpair_name(whopair)[0];
140 if (type != ZFS_DELEG_USER &&
141 type != ZFS_DELEG_USER_SETS)
142 return (SET_ERROR(EPERM));
144 if (strcmp(idstr, &nvpair_name(whopair)[3]) != 0)
145 return (SET_ERROR(EPERM));
150 typedef struct dsl_deleg_arg {
151 const char *dda_name;
152 nvlist_t *dda_nvlist;
156 dsl_deleg_set_sync(void *arg, dmu_tx_t *tx)
158 dsl_deleg_arg_t *dda = arg;
160 dsl_pool_t *dp = dmu_tx_pool(tx);
161 objset_t *mos = dp->dp_meta_objset;
162 nvpair_t *whopair = NULL;
165 VERIFY0(dsl_dir_hold(dp, dda->dda_name, FTAG, &dd, NULL));
167 zapobj = dsl_dir_phys(dd)->dd_deleg_zapobj;
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);
174 while ((whopair = nvlist_next_nvpair(dda->dda_nvlist, whopair))) {
175 const char *whokey = nvpair_name(whopair);
177 nvpair_t *permpair = NULL;
180 perms = fnvpair_value_nvlist(whopair);
182 if (zap_lookup(mos, zapobj, whokey, 8, 1, &jumpobj) != 0) {
183 jumpobj = zap_create_link(mos, DMU_OT_DSL_PERMS,
187 while ((permpair = nvlist_next_nvpair(perms, permpair))) {
188 const char *perm = nvpair_name(permpair);
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);
197 dsl_dir_rele(dd, FTAG);
201 dsl_deleg_unset_sync(void *arg, dmu_tx_t *tx)
203 dsl_deleg_arg_t *dda = arg;
205 dsl_pool_t *dp = dmu_tx_pool(tx);
206 objset_t *mos = dp->dp_meta_objset;
207 nvpair_t *whopair = NULL;
210 VERIFY0(dsl_dir_hold(dp, dda->dda_name, FTAG, &dd, NULL));
211 zapobj = dsl_dir_phys(dd)->dd_deleg_zapobj;
213 dsl_dir_rele(dd, FTAG);
217 while ((whopair = nvlist_next_nvpair(dda->dda_nvlist, whopair))) {
218 const char *whokey = nvpair_name(whopair);
220 nvpair_t *permpair = NULL;
223 if (nvpair_value_nvlist(whopair, &perms) != 0) {
224 if (zap_lookup(mos, zapobj, whokey, 8,
226 (void) zap_remove(mos, zapobj, whokey, tx);
227 VERIFY(0 == zap_destroy(mos, jumpobj, tx));
229 spa_history_log_internal_dd(dd, "permission who remove",
234 if (zap_lookup(mos, zapobj, whokey, 8, 1, &jumpobj) != 0)
237 while ((permpair = nvlist_next_nvpair(perms, permpair))) {
238 const char *perm = nvpair_name(permpair);
241 (void) zap_remove(mos, jumpobj, perm, tx);
242 if (zap_count(mos, jumpobj, &n) == 0 && n == 0) {
243 (void) zap_remove(mos, zapobj,
245 VERIFY(0 == zap_destroy(mos,
248 spa_history_log_internal_dd(dd, "permission remove", tx,
249 "%s %s", whokey, perm);
252 dsl_dir_rele(dd, FTAG);
256 dsl_deleg_check(void *arg, dmu_tx_t *tx)
258 dsl_deleg_arg_t *dda = arg;
262 if (spa_version(dmu_tx_pool(tx)->dp_spa) <
263 SPA_VERSION_DELEGATED_PERMS) {
264 return (SET_ERROR(ENOTSUP));
267 error = dsl_dir_hold(dmu_tx_pool(tx), dda->dda_name, FTAG, &dd, NULL);
269 dsl_dir_rele(dd, FTAG);
274 dsl_deleg_set(const char *ddname, nvlist_t *nvp, boolean_t unset)
278 /* nvp must already have been verified to be valid */
280 dda.dda_name = ddname;
281 dda.dda_nvlist = nvp;
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));
289 * Find all 'allow' permissions from a given point and then continue
290 * traversing up to the root.
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
297 * The nvlist will look like this.
299 * { source fsname -> { whokeys { permissions,...}, ...}}
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.
306 dsl_deleg_get(const char *ddname, nvlist_t **nvp)
308 dsl_dir_t *dd, *startdd;
312 zap_cursor_t *basezc, *zc;
313 zap_attribute_t *baseza, *za;
316 error = dsl_pool_hold(ddname, FTAG, &dp);
320 error = dsl_dir_hold(dp, ddname, FTAG, &startdd, NULL);
322 dsl_pool_rele(dp, FTAG);
326 dp = startdd->dd_pool;
327 mos = dp->dp_meta_objset;
329 zc = kmem_alloc(sizeof (zap_cursor_t), KM_SLEEP);
330 za = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
331 basezc = kmem_alloc(sizeof (zap_cursor_t), KM_SLEEP);
332 baseza = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
333 source = kmem_alloc(ZFS_MAX_DATASET_NAME_LEN, KM_SLEEP);
334 VERIFY(nvlist_alloc(nvp, NV_UNIQUE_NAME, KM_SLEEP) == 0);
336 for (dd = startdd; dd != NULL; dd = dd->dd_parent) {
340 if (dsl_dir_phys(dd)->dd_deleg_zapobj == 0 ||
342 dsl_dir_phys(dd)->dd_deleg_zapobj, &n) != 0 || n == 0)
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)) {
352 ASSERT(baseza->za_integer_length == 8);
353 ASSERT(baseza->za_num_integers == 1);
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);
362 fnvlist_add_nvlist(sp_nvp, baseza->za_name, perms_nvp);
363 fnvlist_free(perms_nvp);
366 zap_cursor_fini(basezc);
368 dsl_dir_name(dd, source);
369 fnvlist_add_nvlist(*nvp, source, sp_nvp);
373 kmem_free(source, ZFS_MAX_DATASET_NAME_LEN);
374 kmem_free(baseza, sizeof (zap_attribute_t));
375 kmem_free(basezc, sizeof (zap_cursor_t));
376 kmem_free(za, sizeof (zap_attribute_t));
377 kmem_free(zc, sizeof (zap_cursor_t));
379 dsl_dir_rele(startdd, FTAG);
380 dsl_pool_rele(dp, FTAG);
385 * Routines for dsl_deleg_access() -- access checking.
387 typedef struct perm_set {
390 char p_setname[ZFS_MAX_DELEG_NAME];
394 perm_set_compare(const void *arg1, const void *arg2)
396 const perm_set_t *node1 = (const perm_set_t *)arg1;
397 const perm_set_t *node2 = (const perm_set_t *)arg2;
400 val = strcmp(node1->p_setname, node2->p_setname);
402 return (TREE_ISIGN(val));
406 * Determine whether a specified permission exists.
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.
412 * Return 0 if permission exists, ENOENT if there is no whokey, EPERM if
413 * there is no perm in that jumpobj.
416 dsl_check_access(objset_t *mos, uint64_t zapobj,
417 char type, char checkflag, void *valp, const char *perm)
420 uint64_t jumpobj, zero;
421 char whokey[ZFS_MAX_DELEG_NAME];
423 zfs_deleg_whokey(whokey, type, checkflag, valp);
424 error = zap_lookup(mos, zapobj, whokey, 8, 1, &jumpobj);
426 error = zap_lookup(mos, jumpobj, perm, 8, 1, &zero);
428 error = SET_ERROR(EPERM);
434 * check a specified user/group for a requested permission
437 dsl_check_user_access(objset_t *mos, uint64_t zapobj, const char *perm,
438 int checkflag, cred_t *cr)
447 if (dsl_check_access(mos, zapobj,
448 ZFS_DELEG_USER, checkflag, &id, perm) == 0)
451 /* check for users primary group */
453 if (dsl_check_access(mos, zapobj,
454 ZFS_DELEG_GROUP, checkflag, &id, perm) == 0)
457 /* check for everyone entry */
459 if (dsl_check_access(mos, zapobj,
460 ZFS_DELEG_EVERYONE, checkflag, &id, perm) == 0)
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++) {
468 if (dsl_check_access(mos, zapobj,
469 ZFS_DELEG_GROUP, checkflag, &id, perm) == 0)
473 return (SET_ERROR(EPERM));
477 * Iterate over the sets specified in the specified zapobj
478 * and load them into the permsets avl tree.
481 dsl_load_sets(objset_t *mos, uint64_t zapobj,
482 char type, char checkflag, void *valp, avl_tree_t *avl)
486 perm_set_t *permnode;
490 char whokey[ZFS_MAX_DELEG_NAME];
492 zfs_deleg_whokey(whokey, type, checkflag, valp);
494 error = zap_lookup(mos, zapobj, whokey, 8, 1, &jumpobj);
498 for (zap_cursor_init(&zc, mos, jumpobj);
499 zap_cursor_retrieve(&zc, &za) == 0;
500 zap_cursor_advance(&zc)) {
501 permnode = kmem_alloc(sizeof (perm_set_t), KM_SLEEP);
502 (void) strlcpy(permnode->p_setname, za.za_name,
503 sizeof (permnode->p_setname));
504 permnode->p_matched = B_FALSE;
506 if (avl_find(avl, permnode, &idx) == NULL) {
507 avl_insert(avl, permnode, idx);
509 kmem_free(permnode, sizeof (perm_set_t));
512 zap_cursor_fini(&zc);
517 * Load all permissions user based on cred belongs to.
520 dsl_load_user_sets(objset_t *mos, uint64_t zapobj, avl_tree_t *avl,
521 char checkflag, cred_t *cr)
528 (void) dsl_load_sets(mos, zapobj,
529 ZFS_DELEG_USER_SETS, checkflag, &id, avl);
532 (void) dsl_load_sets(mos, zapobj,
533 ZFS_DELEG_GROUP_SETS, checkflag, &id, avl);
535 (void) dsl_load_sets(mos, zapobj,
536 ZFS_DELEG_EVERYONE_SETS, checkflag, NULL, avl);
538 ngids = crgetngroups(cr);
539 gids = crgetgroups(cr);
540 for (i = 0; i != ngids; i++) {
542 (void) dsl_load_sets(mos, zapobj,
543 ZFS_DELEG_GROUP_SETS, checkflag, &id, avl);
548 * Check if user has requested permission.
551 dsl_deleg_access_impl(dsl_dataset_t *ds, const char *perm, cred_t *cr)
562 dp = ds->ds_dir->dd_pool;
563 mos = dp->dp_meta_objset;
565 if (dsl_delegation_on(mos) == B_FALSE)
566 return (SET_ERROR(ECANCELED));
568 if (spa_version(dmu_objset_spa(dp->dp_meta_objset)) <
569 SPA_VERSION_DELEGATED_PERMS)
570 return (SET_ERROR(EPERM));
572 if (ds->ds_is_snapshot) {
574 * Snapshots are treated as descendents only,
575 * local permissions do not apply.
577 checkflag = ZFS_DELEG_DESCENDENT;
579 checkflag = ZFS_DELEG_LOCAL;
582 avl_create(&permsets, perm_set_compare, sizeof (perm_set_t),
583 offsetof(perm_set_t, p_node));
585 ASSERT(dsl_pool_config_held(dp));
586 for (dd = ds->ds_dir; dd != NULL; dd = dd->dd_parent,
587 checkflag = ZFS_DELEG_DESCENDENT) {
592 * If not in global zone then make sure
593 * the zoned property is set
595 if (!INGLOBALZONE(curproc)) {
598 if (dsl_prop_get_dd(dd,
599 zfs_prop_to_name(ZFS_PROP_ZONED),
600 8, 1, &zoned, NULL, B_FALSE) != 0)
605 zapobj = dsl_dir_phys(dd)->dd_deleg_zapobj;
610 dsl_load_user_sets(mos, zapobj, &permsets, checkflag, cr);
613 for (setnode = avl_first(&permsets); setnode;
614 setnode = AVL_NEXT(&permsets, setnode)) {
615 if (setnode->p_matched == B_TRUE)
618 /* See if this set directly grants this permission */
619 error = dsl_check_access(mos, zapobj,
620 ZFS_DELEG_NAMED_SET, 0, setnode->p_setname, perm);
624 setnode->p_matched = B_TRUE;
626 /* See if this set includes other sets */
627 error = dsl_load_sets(mos, zapobj,
628 ZFS_DELEG_NAMED_SET_SETS, 0,
629 setnode->p_setname, &permsets);
631 setnode->p_matched = expanded = B_TRUE;
634 * If we expanded any sets, that will define more sets,
635 * which we need to check.
640 error = dsl_check_user_access(mos, zapobj, perm, checkflag, cr);
644 error = SET_ERROR(EPERM);
648 while ((setnode = avl_destroy_nodes(&permsets, &cookie)) != NULL)
649 kmem_free(setnode, sizeof (perm_set_t));
655 dsl_deleg_access(const char *dsname, const char *perm, cred_t *cr)
661 error = dsl_pool_hold(dsname, FTAG, &dp);
664 error = dsl_dataset_hold(dp, dsname, FTAG, &ds);
666 error = dsl_deleg_access_impl(ds, perm, cr);
667 dsl_dataset_rele(ds, FTAG);
669 dsl_pool_rele(dp, FTAG);
679 copy_create_perms(dsl_dir_t *dd, uint64_t pzapobj,
680 boolean_t dosets, uint64_t uid, dmu_tx_t *tx)
682 objset_t *mos = dd->dd_pool->dp_meta_objset;
683 uint64_t jumpobj, pjumpobj;
684 uint64_t zapobj = dsl_dir_phys(dd)->dd_deleg_zapobj;
687 char whokey[ZFS_MAX_DELEG_NAME];
689 zfs_deleg_whokey(whokey,
690 dosets ? ZFS_DELEG_CREATE_SETS : ZFS_DELEG_CREATE,
691 ZFS_DELEG_LOCAL, NULL);
692 if (zap_lookup(mos, pzapobj, whokey, 8, 1, &pjumpobj) != 0)
696 dmu_buf_will_dirty(dd->dd_dbuf, tx);
697 zapobj = dsl_dir_phys(dd)->dd_deleg_zapobj = zap_create(mos,
698 DMU_OT_DSL_PERMS, DMU_OT_NONE, 0, tx);
701 zfs_deleg_whokey(whokey,
702 dosets ? ZFS_DELEG_USER_SETS : ZFS_DELEG_USER,
703 ZFS_DELEG_LOCAL, &uid);
704 if (zap_lookup(mos, zapobj, whokey, 8, 1, &jumpobj) == ENOENT) {
705 jumpobj = zap_create(mos, DMU_OT_DSL_PERMS, DMU_OT_NONE, 0, tx);
706 VERIFY(zap_add(mos, zapobj, whokey, 8, 1, &jumpobj, tx) == 0);
709 for (zap_cursor_init(&zc, mos, pjumpobj);
710 zap_cursor_retrieve(&zc, &za) == 0;
711 zap_cursor_advance(&zc)) {
713 ASSERT(za.za_integer_length == 8 && za.za_num_integers == 1);
715 VERIFY(zap_update(mos, jumpobj, za.za_name,
716 8, 1, &zero, tx) == 0);
718 zap_cursor_fini(&zc);
722 * set all create time permission on new dataset.
725 dsl_deleg_set_create_perms(dsl_dir_t *sdd, dmu_tx_t *tx, cred_t *cr)
728 uint64_t uid = crgetuid(cr);
730 if (spa_version(dmu_objset_spa(sdd->dd_pool->dp_meta_objset)) <
731 SPA_VERSION_DELEGATED_PERMS)
734 for (dd = sdd->dd_parent; dd != NULL; dd = dd->dd_parent) {
735 uint64_t pzapobj = dsl_dir_phys(dd)->dd_deleg_zapobj;
740 copy_create_perms(sdd, pzapobj, B_FALSE, uid, tx);
741 copy_create_perms(sdd, pzapobj, B_TRUE, uid, tx);
746 dsl_deleg_destroy(objset_t *mos, uint64_t zapobj, dmu_tx_t *tx)
754 for (zap_cursor_init(&zc, mos, zapobj);
755 zap_cursor_retrieve(&zc, &za) == 0;
756 zap_cursor_advance(&zc)) {
757 ASSERT(za.za_integer_length == 8 && za.za_num_integers == 1);
758 VERIFY(0 == zap_destroy(mos, za.za_first_integer, tx));
760 zap_cursor_fini(&zc);
761 VERIFY(0 == zap_destroy(mos, zapobj, tx));
766 dsl_delegation_on(objset_t *os)
768 return (!!spa_delegation(os->os_spa));
772 EXPORT_SYMBOL(dsl_deleg_get);
773 EXPORT_SYMBOL(dsl_deleg_set);