4 * This file and its contents are supplied under the terms of the
5 * Common Development and Distribution License ("CDDL"), version 1.0.
6 * You may only use this file in accordance with the terms of version
9 * A full copy of the text of the CDDL should have accompanied this
10 * source. A copy of the CDDL is also available via the Internet at
11 * http://www.illumos.org/license/CDDL.
17 * Copyright (c) 2017, Datto, Inc. All rights reserved.
20 #include <sys/dsl_crypt.h>
21 #include <sys/dsl_pool.h>
24 #include <sys/dsl_dir.h>
25 #include <sys/dsl_prop.h>
26 #include <sys/spa_impl.h>
27 #include <sys/dmu_objset.h>
31 * This file's primary purpose is for managing master encryption keys in
32 * memory and on disk. For more info on how these keys are used, see the
33 * block comment in zio_crypt.c.
35 * All master keys are stored encrypted on disk in the form of the DSL
36 * Crypto Key ZAP object. The binary key data in this object is always
37 * randomly generated and is encrypted with the user's wrapping key. This
38 * layer of indirection allows the user to change their key without
39 * needing to re-encrypt the entire dataset. The ZAP also holds on to the
40 * (non-encrypted) encryption algorithm identifier, IV, and MAC needed to
41 * safely decrypt the master key. For more info on the user's key see the
42 * block comment in libzfs_crypto.c
44 * In-memory encryption keys are managed through the spa_keystore. The
45 * keystore consists of 3 AVL trees, which are as follows:
47 * The Wrapping Key Tree:
48 * The wrapping key (wkey) tree stores the user's keys that are fed into the
49 * kernel through 'zfs load-key' and related commands. Datasets inherit their
50 * parent's wkey by default, so these structures are refcounted. The wrapping
51 * keys remain in memory until they are explicitly unloaded (with
52 * "zfs unload-key"). Unloading is only possible when no datasets are using
55 * The DSL Crypto Key Tree:
56 * The DSL Crypto Keys (DCK) are the in-memory representation of decrypted
57 * master keys. They are used by the functions in zio_crypt.c to perform
58 * encryption, decryption, and authentication. Snapshots and clones of a given
59 * dataset will share a DSL Crypto Key, so they are also refcounted. Once the
60 * refcount on a key hits zero, it is immediately zeroed out and freed.
62 * The Crypto Key Mapping Tree:
63 * The zio layer needs to lookup master keys by their dataset object id. Since
64 * the DSL Crypto Keys can belong to multiple datasets, we maintain a tree of
65 * dsl_key_mapping_t's which essentially just map the dataset object id to its
66 * appropriate DSL Crypto Key. The management for creating and destroying these
67 * mappings hooks into the code for owning and disowning datasets. Usually,
68 * there will only be one active dataset owner, but there are times
69 * (particularly during dataset creation and destruction) when this may not be
70 * true or the dataset may not be initialized enough to own. As a result, this
71 * object is also refcounted.
75 dsl_wrapping_key_hold(dsl_wrapping_key_t *wkey, void *tag)
77 (void) refcount_add(&wkey->wk_refcnt, tag);
81 dsl_wrapping_key_rele(dsl_wrapping_key_t *wkey, void *tag)
83 (void) refcount_remove(&wkey->wk_refcnt, tag);
87 dsl_wrapping_key_free(dsl_wrapping_key_t *wkey)
89 ASSERT0(refcount_count(&wkey->wk_refcnt));
91 if (wkey->wk_key.ck_data) {
92 bzero(wkey->wk_key.ck_data,
93 CRYPTO_BITS2BYTES(wkey->wk_key.ck_length));
94 kmem_free(wkey->wk_key.ck_data,
95 CRYPTO_BITS2BYTES(wkey->wk_key.ck_length));
98 refcount_destroy(&wkey->wk_refcnt);
99 kmem_free(wkey, sizeof (dsl_wrapping_key_t));
103 dsl_wrapping_key_create(uint8_t *wkeydata, zfs_keyformat_t keyformat,
104 uint64_t salt, uint64_t iters, dsl_wrapping_key_t **wkey_out)
107 dsl_wrapping_key_t *wkey;
109 /* allocate the wrapping key */
110 wkey = kmem_alloc(sizeof (dsl_wrapping_key_t), KM_SLEEP);
112 return (SET_ERROR(ENOMEM));
114 /* allocate and initialize the underlying crypto key */
115 wkey->wk_key.ck_data = kmem_alloc(WRAPPING_KEY_LEN, KM_SLEEP);
116 if (!wkey->wk_key.ck_data) {
121 wkey->wk_key.ck_format = CRYPTO_KEY_RAW;
122 wkey->wk_key.ck_length = CRYPTO_BYTES2BITS(WRAPPING_KEY_LEN);
123 bcopy(wkeydata, wkey->wk_key.ck_data, WRAPPING_KEY_LEN);
125 /* initialize the rest of the struct */
126 refcount_create(&wkey->wk_refcnt);
127 wkey->wk_keyformat = keyformat;
128 wkey->wk_salt = salt;
129 wkey->wk_iters = iters;
135 dsl_wrapping_key_free(wkey);
142 dsl_crypto_params_create_nvlist(dcp_cmd_t cmd, nvlist_t *props,
143 nvlist_t *crypto_args, dsl_crypto_params_t **dcp_out)
146 uint64_t crypt = ZIO_CRYPT_INHERIT;
147 uint64_t keyformat = ZFS_KEYFORMAT_NONE;
148 uint64_t salt = 0, iters = 0;
149 dsl_crypto_params_t *dcp = NULL;
150 dsl_wrapping_key_t *wkey = NULL;
151 uint8_t *wkeydata = NULL;
152 uint_t wkeydata_len = 0;
153 char *keylocation = NULL;
155 dcp = kmem_zalloc(sizeof (dsl_crypto_params_t), KM_SLEEP);
157 ret = SET_ERROR(ENOMEM);
163 /* get relevant arguments from the nvlists */
165 (void) nvlist_lookup_uint64(props,
166 zfs_prop_to_name(ZFS_PROP_ENCRYPTION), &crypt);
167 (void) nvlist_lookup_uint64(props,
168 zfs_prop_to_name(ZFS_PROP_KEYFORMAT), &keyformat);
169 (void) nvlist_lookup_string(props,
170 zfs_prop_to_name(ZFS_PROP_KEYLOCATION), &keylocation);
171 (void) nvlist_lookup_uint64(props,
172 zfs_prop_to_name(ZFS_PROP_PBKDF2_SALT), &salt);
173 (void) nvlist_lookup_uint64(props,
174 zfs_prop_to_name(ZFS_PROP_PBKDF2_ITERS), &iters);
176 dcp->cp_crypt = crypt;
179 if (crypto_args != NULL) {
180 (void) nvlist_lookup_uint8_array(crypto_args, "wkeydata",
181 &wkeydata, &wkeydata_len);
184 /* check for valid command */
185 if (dcp->cp_cmd >= DCP_CMD_MAX) {
186 ret = SET_ERROR(EINVAL);
192 /* check for valid crypt */
193 if (dcp->cp_crypt >= ZIO_CRYPT_FUNCTIONS) {
194 ret = SET_ERROR(EINVAL);
197 dcp->cp_crypt = crypt;
200 /* check for valid keyformat */
201 if (keyformat >= ZFS_KEYFORMAT_FORMATS) {
202 ret = SET_ERROR(EINVAL);
206 /* check for a valid keylocation (of any kind) and copy it in */
207 if (keylocation != NULL) {
208 if (!zfs_prop_valid_keylocation(keylocation, B_FALSE)) {
209 ret = SET_ERROR(EINVAL);
213 dcp->cp_keylocation = spa_strdup(keylocation);
216 /* check wrapping key length, if given */
217 if (wkeydata != NULL && wkeydata_len != WRAPPING_KEY_LEN) {
218 ret = SET_ERROR(EINVAL);
222 /* if the user asked for the deault crypt, determine that now */
223 if (dcp->cp_crypt == ZIO_CRYPT_ON)
224 dcp->cp_crypt = ZIO_CRYPT_ON_VALUE;
226 /* create the wrapping key from the raw data */
227 if (wkeydata != NULL) {
228 /* create the wrapping key with the verified parameters */
229 ret = dsl_wrapping_key_create(wkeydata, keyformat, salt,
238 * Remove the encryption properties from the nvlist since they are not
239 * maintained through the DSL.
241 (void) nvlist_remove_all(props, zfs_prop_to_name(ZFS_PROP_ENCRYPTION));
242 (void) nvlist_remove_all(props, zfs_prop_to_name(ZFS_PROP_KEYFORMAT));
243 (void) nvlist_remove_all(props, zfs_prop_to_name(ZFS_PROP_PBKDF2_SALT));
244 (void) nvlist_remove_all(props,
245 zfs_prop_to_name(ZFS_PROP_PBKDF2_ITERS));
253 dsl_wrapping_key_free(wkey);
255 kmem_free(dcp, sizeof (dsl_crypto_params_t));
262 dsl_crypto_params_free(dsl_crypto_params_t *dcp, boolean_t unload)
267 if (dcp->cp_keylocation != NULL)
268 spa_strfree(dcp->cp_keylocation);
269 if (unload && dcp->cp_wkey != NULL)
270 dsl_wrapping_key_free(dcp->cp_wkey);
272 kmem_free(dcp, sizeof (dsl_crypto_params_t));
276 spa_crypto_key_compare(const void *a, const void *b)
278 const dsl_crypto_key_t *dcka = a;
279 const dsl_crypto_key_t *dckb = b;
281 if (dcka->dck_obj < dckb->dck_obj)
283 if (dcka->dck_obj > dckb->dck_obj)
289 spa_key_mapping_compare(const void *a, const void *b)
291 const dsl_key_mapping_t *kma = a;
292 const dsl_key_mapping_t *kmb = b;
294 if (kma->km_dsobj < kmb->km_dsobj)
296 if (kma->km_dsobj > kmb->km_dsobj)
302 spa_wkey_compare(const void *a, const void *b)
304 const dsl_wrapping_key_t *wka = a;
305 const dsl_wrapping_key_t *wkb = b;
307 if (wka->wk_ddobj < wkb->wk_ddobj)
309 if (wka->wk_ddobj > wkb->wk_ddobj)
315 spa_keystore_init(spa_keystore_t *sk)
317 rw_init(&sk->sk_dk_lock, NULL, RW_DEFAULT, NULL);
318 rw_init(&sk->sk_km_lock, NULL, RW_DEFAULT, NULL);
319 rw_init(&sk->sk_wkeys_lock, NULL, RW_DEFAULT, NULL);
320 avl_create(&sk->sk_dsl_keys, spa_crypto_key_compare,
321 sizeof (dsl_crypto_key_t),
322 offsetof(dsl_crypto_key_t, dck_avl_link));
323 avl_create(&sk->sk_key_mappings, spa_key_mapping_compare,
324 sizeof (dsl_key_mapping_t),
325 offsetof(dsl_key_mapping_t, km_avl_link));
326 avl_create(&sk->sk_wkeys, spa_wkey_compare, sizeof (dsl_wrapping_key_t),
327 offsetof(dsl_wrapping_key_t, wk_avl_link));
331 spa_keystore_fini(spa_keystore_t *sk)
333 dsl_wrapping_key_t *wkey;
336 ASSERT(avl_is_empty(&sk->sk_dsl_keys));
337 ASSERT(avl_is_empty(&sk->sk_key_mappings));
339 while ((wkey = avl_destroy_nodes(&sk->sk_wkeys, &cookie)) != NULL)
340 dsl_wrapping_key_free(wkey);
342 avl_destroy(&sk->sk_wkeys);
343 avl_destroy(&sk->sk_key_mappings);
344 avl_destroy(&sk->sk_dsl_keys);
345 rw_destroy(&sk->sk_wkeys_lock);
346 rw_destroy(&sk->sk_km_lock);
347 rw_destroy(&sk->sk_dk_lock);
351 dsl_dir_get_encryption_root_ddobj(dsl_dir_t *dd, uint64_t *rddobj)
353 if (dd->dd_crypto_obj == 0)
354 return (SET_ERROR(ENOENT));
356 return (zap_lookup(dd->dd_pool->dp_meta_objset, dd->dd_crypto_obj,
357 DSL_CRYPTO_KEY_ROOT_DDOBJ, 8, 1, rddobj));
361 spa_keystore_wkey_hold_ddobj_impl(spa_t *spa, uint64_t ddobj,
362 void *tag, dsl_wrapping_key_t **wkey_out)
365 dsl_wrapping_key_t search_wkey;
366 dsl_wrapping_key_t *found_wkey;
368 ASSERT(RW_LOCK_HELD(&spa->spa_keystore.sk_wkeys_lock));
370 /* init the search wrapping key */
371 search_wkey.wk_ddobj = ddobj;
373 /* lookup the wrapping key */
374 found_wkey = avl_find(&spa->spa_keystore.sk_wkeys, &search_wkey, NULL);
376 ret = SET_ERROR(ENOENT);
380 /* increment the refcount */
381 dsl_wrapping_key_hold(found_wkey, tag);
383 *wkey_out = found_wkey;
392 spa_keystore_wkey_hold_dd(spa_t *spa, dsl_dir_t *dd, void *tag,
393 dsl_wrapping_key_t **wkey_out)
396 dsl_wrapping_key_t *wkey;
398 boolean_t locked = B_FALSE;
400 if (!RW_WRITE_HELD(&spa->spa_keystore.sk_wkeys_lock)) {
401 rw_enter(&spa->spa_keystore.sk_wkeys_lock, RW_READER);
405 /* get the ddobj that the keylocation property was inherited from */
406 ret = dsl_dir_get_encryption_root_ddobj(dd, &rddobj);
410 /* lookup the wkey in the avl tree */
411 ret = spa_keystore_wkey_hold_ddobj_impl(spa, rddobj, tag, &wkey);
415 /* unlock the wkey tree if we locked it */
417 rw_exit(&spa->spa_keystore.sk_wkeys_lock);
424 rw_exit(&spa->spa_keystore.sk_wkeys_lock);
431 dsl_crypto_can_set_keylocation(const char *dsname, const char *keylocation)
434 dsl_dir_t *dd = NULL;
435 dsl_pool_t *dp = NULL;
438 /* hold the dsl dir */
439 ret = dsl_pool_hold(dsname, FTAG, &dp);
443 ret = dsl_dir_hold(dp, dsname, FTAG, &dd, NULL);
447 /* if dd is not encrypted, the value may only be "none" */
448 if (dd->dd_crypto_obj == 0) {
449 if (strcmp(keylocation, "none") != 0) {
450 ret = SET_ERROR(EACCES);
458 /* check for a valid keylocation for encrypted datasets */
459 if (!zfs_prop_valid_keylocation(keylocation, B_TRUE)) {
460 ret = SET_ERROR(EINVAL);
464 /* check that this is an encryption root */
465 ret = dsl_dir_get_encryption_root_ddobj(dd, &rddobj);
469 if (rddobj != dd->dd_object) {
470 ret = SET_ERROR(EACCES);
474 dsl_dir_rele(dd, FTAG);
475 dsl_pool_rele(dp, FTAG);
481 dsl_dir_rele(dd, FTAG);
483 dsl_pool_rele(dp, FTAG);
489 dsl_crypto_key_free(dsl_crypto_key_t *dck)
491 ASSERT(refcount_count(&dck->dck_holds) == 0);
493 /* destroy the zio_crypt_key_t */
494 zio_crypt_key_destroy(&dck->dck_key);
496 /* free the refcount, wrapping key, and lock */
497 refcount_destroy(&dck->dck_holds);
499 dsl_wrapping_key_rele(dck->dck_wkey, dck);
502 kmem_free(dck, sizeof (dsl_crypto_key_t));
506 dsl_crypto_key_rele(dsl_crypto_key_t *dck, void *tag)
508 if (refcount_remove(&dck->dck_holds, tag) == 0)
509 dsl_crypto_key_free(dck);
513 dsl_crypto_key_open(objset_t *mos, dsl_wrapping_key_t *wkey,
514 uint64_t dckobj, void *tag, dsl_crypto_key_t **dck_out)
517 uint64_t crypt = 0, guid = 0;
518 uint8_t raw_keydata[MASTER_KEY_MAX_LEN];
519 uint8_t raw_hmac_keydata[SHA512_HMAC_KEYLEN];
520 uint8_t iv[WRAPPING_IV_LEN];
521 uint8_t mac[WRAPPING_MAC_LEN];
522 dsl_crypto_key_t *dck;
524 /* allocate and initialize the key */
525 dck = kmem_zalloc(sizeof (dsl_crypto_key_t), KM_SLEEP);
527 return (SET_ERROR(ENOMEM));
529 /* fetch all of the values we need from the ZAP */
530 ret = zap_lookup(mos, dckobj, DSL_CRYPTO_KEY_CRYPTO_SUITE, 8, 1,
535 ret = zap_lookup(mos, dckobj, DSL_CRYPTO_KEY_GUID, 8, 1, &guid);
539 ret = zap_lookup(mos, dckobj, DSL_CRYPTO_KEY_MASTER_KEY, 1,
540 MASTER_KEY_MAX_LEN, raw_keydata);
544 ret = zap_lookup(mos, dckobj, DSL_CRYPTO_KEY_HMAC_KEY, 1,
545 SHA512_HMAC_KEYLEN, raw_hmac_keydata);
549 ret = zap_lookup(mos, dckobj, DSL_CRYPTO_KEY_IV, 1, WRAPPING_IV_LEN,
554 ret = zap_lookup(mos, dckobj, DSL_CRYPTO_KEY_MAC, 1, WRAPPING_MAC_LEN,
560 * Unwrap the keys. If there is an error return EACCES to indicate
561 * an authentication failure.
563 ret = zio_crypt_key_unwrap(&wkey->wk_key, crypt, guid, raw_keydata,
564 raw_hmac_keydata, iv, mac, &dck->dck_key);
566 ret = SET_ERROR(EACCES);
570 /* finish initializing the dsl_crypto_key_t */
571 refcount_create(&dck->dck_holds);
572 dsl_wrapping_key_hold(wkey, dck);
573 dck->dck_wkey = wkey;
574 dck->dck_obj = dckobj;
575 refcount_add(&dck->dck_holds, tag);
582 bzero(dck, sizeof (dsl_crypto_key_t));
583 kmem_free(dck, sizeof (dsl_crypto_key_t));
591 spa_keystore_dsl_key_hold_impl(spa_t *spa, uint64_t dckobj, void *tag,
592 dsl_crypto_key_t **dck_out)
595 dsl_crypto_key_t search_dck;
596 dsl_crypto_key_t *found_dck;
598 ASSERT(RW_LOCK_HELD(&spa->spa_keystore.sk_dk_lock));
600 /* init the search key */
601 search_dck.dck_obj = dckobj;
603 /* find the matching key in the keystore */
604 found_dck = avl_find(&spa->spa_keystore.sk_dsl_keys, &search_dck, NULL);
606 ret = SET_ERROR(ENOENT);
610 /* increment the refcount */
611 refcount_add(&found_dck->dck_holds, tag);
613 *dck_out = found_dck;
622 spa_keystore_dsl_key_hold_dd(spa_t *spa, dsl_dir_t *dd, void *tag,
623 dsl_crypto_key_t **dck_out)
627 dsl_crypto_key_t *dck = NULL;
628 dsl_wrapping_key_t *wkey = NULL;
629 uint64_t dckobj = dd->dd_crypto_obj;
631 rw_enter(&spa->spa_keystore.sk_dk_lock, RW_WRITER);
633 /* lookup the key in the tree of currently loaded keys */
634 ret = spa_keystore_dsl_key_hold_impl(spa, dckobj, tag, &dck);
636 rw_exit(&spa->spa_keystore.sk_dk_lock);
641 /* lookup the wrapping key from the keystore */
642 ret = spa_keystore_wkey_hold_dd(spa, dd, FTAG, &wkey);
644 ret = SET_ERROR(EACCES);
648 /* read the key from disk */
649 ret = dsl_crypto_key_open(spa->spa_meta_objset, wkey, dckobj,
655 * add the key to the keystore (this should always succeed
656 * since we made sure it didn't exist before)
658 avl_find(&spa->spa_keystore.sk_dsl_keys, dck, &where);
659 avl_insert(&spa->spa_keystore.sk_dsl_keys, dck, where);
661 /* release the wrapping key (the dsl key now has a reference to it) */
662 dsl_wrapping_key_rele(wkey, FTAG);
664 rw_exit(&spa->spa_keystore.sk_dk_lock);
670 rw_exit(&spa->spa_keystore.sk_dk_lock);
672 dsl_wrapping_key_rele(wkey, FTAG);
679 spa_keystore_dsl_key_rele(spa_t *spa, dsl_crypto_key_t *dck, void *tag)
681 rw_enter(&spa->spa_keystore.sk_dk_lock, RW_WRITER);
683 if (refcount_remove(&dck->dck_holds, tag) == 0) {
684 avl_remove(&spa->spa_keystore.sk_dsl_keys, dck);
685 dsl_crypto_key_free(dck);
688 rw_exit(&spa->spa_keystore.sk_dk_lock);
692 spa_keystore_load_wkey_impl(spa_t *spa, dsl_wrapping_key_t *wkey)
696 dsl_wrapping_key_t *found_wkey;
698 rw_enter(&spa->spa_keystore.sk_wkeys_lock, RW_WRITER);
700 /* insert the wrapping key into the keystore */
701 found_wkey = avl_find(&spa->spa_keystore.sk_wkeys, wkey, &where);
702 if (found_wkey != NULL) {
703 ret = SET_ERROR(EEXIST);
706 avl_insert(&spa->spa_keystore.sk_wkeys, wkey, where);
708 rw_exit(&spa->spa_keystore.sk_wkeys_lock);
713 rw_exit(&spa->spa_keystore.sk_wkeys_lock);
718 spa_keystore_load_wkey(const char *dsname, dsl_crypto_params_t *dcp,
722 dsl_dir_t *dd = NULL;
723 dsl_crypto_key_t *dck = NULL;
724 dsl_wrapping_key_t *wkey = dcp->cp_wkey;
725 dsl_pool_t *dp = NULL;
726 uint64_t keyformat, salt, iters;
729 * We don't validate the wrapping key's keyformat, salt, or iters
730 * since they will never be needed after the DCK has been wrapped.
732 if (dcp->cp_wkey == NULL ||
733 dcp->cp_cmd != DCP_CMD_NONE ||
734 dcp->cp_crypt != ZIO_CRYPT_INHERIT ||
735 dcp->cp_keylocation != NULL)
736 return (SET_ERROR(EINVAL));
738 ret = dsl_pool_hold(dsname, FTAG, &dp);
742 if (!spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_ENCRYPTION)) {
743 ret = (SET_ERROR(ENOTSUP));
747 /* hold the dsl dir */
748 ret = dsl_dir_hold(dp, dsname, FTAG, &dd, NULL);
752 /* initialize the wkey's ddobj */
753 wkey->wk_ddobj = dd->dd_object;
755 /* verify that the wkey is correct by opening its dsl key */
756 ret = dsl_crypto_key_open(dp->dp_meta_objset, wkey,
757 dd->dd_crypto_obj, FTAG, &dck);
761 /* initialize the wkey encryption parameters from the DSL Crypto Key */
762 ret = zap_lookup(dp->dp_meta_objset, dd->dd_crypto_obj,
763 zfs_prop_to_name(ZFS_PROP_KEYFORMAT), 8, 1, &keyformat);
767 ret = zap_lookup(dp->dp_meta_objset, dd->dd_crypto_obj,
768 zfs_prop_to_name(ZFS_PROP_PBKDF2_SALT), 8, 1, &salt);
772 ret = zap_lookup(dp->dp_meta_objset, dd->dd_crypto_obj,
773 zfs_prop_to_name(ZFS_PROP_PBKDF2_ITERS), 8, 1, &iters);
777 ASSERT3U(keyformat, <, ZFS_KEYFORMAT_FORMATS);
778 ASSERT3U(keyformat, !=, ZFS_KEYFORMAT_NONE);
779 IMPLY(keyformat == ZFS_KEYFORMAT_PASSPHRASE, iters != 0);
780 IMPLY(keyformat == ZFS_KEYFORMAT_PASSPHRASE, salt != 0);
781 IMPLY(keyformat != ZFS_KEYFORMAT_PASSPHRASE, iters == 0);
782 IMPLY(keyformat != ZFS_KEYFORMAT_PASSPHRASE, salt == 0);
784 wkey->wk_keyformat = keyformat;
785 wkey->wk_salt = salt;
786 wkey->wk_iters = iters;
789 * At this point we have verified the wkey and confirmed that it can
790 * be used to decrypt a DSL Crypto Key. We can simply cleanup and
791 * return if this is all the user wanted to do.
796 /* insert the wrapping key into the keystore */
797 ret = spa_keystore_load_wkey_impl(dp->dp_spa, wkey);
801 dsl_crypto_key_rele(dck, FTAG);
802 dsl_dir_rele(dd, FTAG);
803 dsl_pool_rele(dp, FTAG);
805 /* create any zvols under this ds */
806 zvol_create_minors(dp->dp_spa, dsname, B_TRUE);
812 dsl_crypto_key_rele(dck, FTAG);
814 dsl_dir_rele(dd, FTAG);
816 dsl_pool_rele(dp, FTAG);
822 spa_keystore_unload_wkey_impl(spa_t *spa, uint64_t ddobj)
825 dsl_wrapping_key_t search_wkey;
826 dsl_wrapping_key_t *found_wkey;
828 /* init the search wrapping key */
829 search_wkey.wk_ddobj = ddobj;
831 rw_enter(&spa->spa_keystore.sk_wkeys_lock, RW_WRITER);
833 /* remove the wrapping key from the keystore */
834 found_wkey = avl_find(&spa->spa_keystore.sk_wkeys,
837 ret = SET_ERROR(ENOENT);
839 } else if (refcount_count(&found_wkey->wk_refcnt) != 0) {
840 ret = SET_ERROR(EBUSY);
843 avl_remove(&spa->spa_keystore.sk_wkeys, found_wkey);
845 rw_exit(&spa->spa_keystore.sk_wkeys_lock);
847 /* free the wrapping key */
848 dsl_wrapping_key_free(found_wkey);
853 rw_exit(&spa->spa_keystore.sk_wkeys_lock);
858 spa_keystore_unload_wkey(const char *dsname)
861 dsl_dir_t *dd = NULL;
862 dsl_pool_t *dp = NULL;
864 /* hold the dsl dir */
865 ret = dsl_pool_hold(dsname, FTAG, &dp);
869 if (!spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_ENCRYPTION)) {
870 ret = (SET_ERROR(ENOTSUP));
874 ret = dsl_dir_hold(dp, dsname, FTAG, &dd, NULL);
878 /* unload the wkey */
879 ret = spa_keystore_unload_wkey_impl(dp->dp_spa, dd->dd_object);
883 dsl_dir_rele(dd, FTAG);
884 dsl_pool_rele(dp, FTAG);
886 /* remove any zvols under this ds */
887 zvol_remove_minors(dp->dp_spa, dsname, B_TRUE);
893 dsl_dir_rele(dd, FTAG);
895 dsl_pool_rele(dp, FTAG);
901 spa_keystore_create_mapping_impl(spa_t *spa, uint64_t dsobj,
902 dsl_dir_t *dd, void *tag)
906 dsl_key_mapping_t *km = NULL, *found_km;
907 boolean_t should_free = B_FALSE;
909 /* allocate the mapping */
910 km = kmem_alloc(sizeof (dsl_key_mapping_t), KM_SLEEP);
912 return (SET_ERROR(ENOMEM));
914 /* initialize the mapping */
915 refcount_create(&km->km_refcnt);
917 ret = spa_keystore_dsl_key_hold_dd(spa, dd, km, &km->km_key);
921 km->km_dsobj = dsobj;
923 rw_enter(&spa->spa_keystore.sk_km_lock, RW_WRITER);
926 * If a mapping already exists, simply increment its refcount and
927 * cleanup the one we made. We want to allocate / free outside of
928 * the lock because this lock is also used by the zio layer to lookup
929 * key mappings. Otherwise, use the one we created. Normally, there will
930 * only be one active reference at a time (the objset owner), but there
931 * are times when there could be multiple async users.
933 found_km = avl_find(&spa->spa_keystore.sk_key_mappings, km, &where);
934 if (found_km != NULL) {
935 should_free = B_TRUE;
936 refcount_add(&found_km->km_refcnt, tag);
938 refcount_add(&km->km_refcnt, tag);
939 avl_insert(&spa->spa_keystore.sk_key_mappings, km, where);
942 rw_exit(&spa->spa_keystore.sk_km_lock);
945 spa_keystore_dsl_key_rele(spa, km->km_key, km);
946 refcount_destroy(&km->km_refcnt);
947 kmem_free(km, sizeof (dsl_key_mapping_t));
954 spa_keystore_dsl_key_rele(spa, km->km_key, km);
956 refcount_destroy(&km->km_refcnt);
957 kmem_free(km, sizeof (dsl_key_mapping_t));
963 spa_keystore_create_mapping(spa_t *spa, dsl_dataset_t *ds, void *tag)
965 return (spa_keystore_create_mapping_impl(spa, ds->ds_object,
970 spa_keystore_remove_mapping(spa_t *spa, uint64_t dsobj, void *tag)
973 dsl_key_mapping_t search_km;
974 dsl_key_mapping_t *found_km;
975 boolean_t should_free = B_FALSE;
977 /* init the search key mapping */
978 search_km.km_dsobj = dsobj;
980 rw_enter(&spa->spa_keystore.sk_km_lock, RW_WRITER);
982 /* find the matching mapping */
983 found_km = avl_find(&spa->spa_keystore.sk_key_mappings,
985 if (found_km == NULL) {
986 ret = SET_ERROR(ENOENT);
991 * Decrement the refcount on the mapping and remove it from the tree if
992 * it is zero. Try to minimize time spent in this lock by deferring
995 if (refcount_remove(&found_km->km_refcnt, tag) == 0) {
996 should_free = B_TRUE;
997 avl_remove(&spa->spa_keystore.sk_key_mappings, found_km);
1000 rw_exit(&spa->spa_keystore.sk_km_lock);
1002 /* destroy the key mapping */
1004 spa_keystore_dsl_key_rele(spa, found_km->km_key, found_km);
1005 kmem_free(found_km, sizeof (dsl_key_mapping_t));
1011 rw_exit(&spa->spa_keystore.sk_km_lock);
1016 * This function is primarily used by the zio and arc layer to lookup
1017 * DSL Crypto Keys for encryption. Callers must release the key with
1018 * spa_keystore_dsl_key_rele(). The function may also be called with
1019 * dck_out == NULL and tag == NULL to simply check that a key exists
1020 * without getting a reference to it.
1023 spa_keystore_lookup_key(spa_t *spa, uint64_t dsobj, void *tag,
1024 dsl_crypto_key_t **dck_out)
1027 dsl_key_mapping_t search_km;
1028 dsl_key_mapping_t *found_km;
1030 ASSERT((tag != NULL && dck_out != NULL) ||
1031 (tag == NULL && dck_out == NULL));
1033 /* init the search key mapping */
1034 search_km.km_dsobj = dsobj;
1036 rw_enter(&spa->spa_keystore.sk_km_lock, RW_READER);
1038 /* remove the mapping from the tree */
1039 found_km = avl_find(&spa->spa_keystore.sk_key_mappings, &search_km,
1041 if (found_km == NULL) {
1042 ret = SET_ERROR(ENOENT);
1046 if (found_km && tag)
1047 refcount_add(&found_km->km_key->dck_holds, tag);
1049 rw_exit(&spa->spa_keystore.sk_km_lock);
1051 if (dck_out != NULL)
1052 *dck_out = found_km->km_key;
1056 rw_exit(&spa->spa_keystore.sk_km_lock);
1058 if (dck_out != NULL)
1064 dmu_objset_check_wkey_loaded(dsl_dir_t *dd)
1067 dsl_wrapping_key_t *wkey = NULL;
1069 ret = spa_keystore_wkey_hold_dd(dd->dd_pool->dp_spa, dd, FTAG,
1072 return (SET_ERROR(EACCES));
1074 dsl_wrapping_key_rele(wkey, FTAG);
1079 static zfs_keystatus_t
1080 dsl_dataset_get_keystatus(dsl_dir_t *dd)
1082 /* check if this dd has a has a dsl key */
1083 if (dd->dd_crypto_obj == 0)
1084 return (ZFS_KEYSTATUS_NONE);
1086 return (dmu_objset_check_wkey_loaded(dd) == 0 ?
1087 ZFS_KEYSTATUS_AVAILABLE : ZFS_KEYSTATUS_UNAVAILABLE);
1091 dsl_dir_get_crypt(dsl_dir_t *dd, uint64_t *crypt)
1093 if (dd->dd_crypto_obj == 0) {
1094 *crypt = ZIO_CRYPT_OFF;
1098 return (zap_lookup(dd->dd_pool->dp_meta_objset, dd->dd_crypto_obj,
1099 DSL_CRYPTO_KEY_CRYPTO_SUITE, 8, 1, crypt));
1103 dsl_crypto_key_sync_impl(objset_t *mos, uint64_t dckobj, uint64_t crypt,
1104 uint64_t root_ddobj, uint64_t guid, uint8_t *iv, uint8_t *mac,
1105 uint8_t *keydata, uint8_t *hmac_keydata, uint64_t keyformat,
1106 uint64_t salt, uint64_t iters, dmu_tx_t *tx)
1108 VERIFY0(zap_update(mos, dckobj, DSL_CRYPTO_KEY_CRYPTO_SUITE, 8, 1,
1110 VERIFY0(zap_update(mos, dckobj, DSL_CRYPTO_KEY_ROOT_DDOBJ, 8, 1,
1112 VERIFY0(zap_update(mos, dckobj, DSL_CRYPTO_KEY_GUID, 8, 1,
1114 VERIFY0(zap_update(mos, dckobj, DSL_CRYPTO_KEY_IV, 1, WRAPPING_IV_LEN,
1116 VERIFY0(zap_update(mos, dckobj, DSL_CRYPTO_KEY_MAC, 1, WRAPPING_MAC_LEN,
1118 VERIFY0(zap_update(mos, dckobj, DSL_CRYPTO_KEY_MASTER_KEY, 1,
1119 MASTER_KEY_MAX_LEN, keydata, tx));
1120 VERIFY0(zap_update(mos, dckobj, DSL_CRYPTO_KEY_HMAC_KEY, 1,
1121 SHA512_HMAC_KEYLEN, hmac_keydata, tx));
1122 VERIFY0(zap_update(mos, dckobj, zfs_prop_to_name(ZFS_PROP_KEYFORMAT),
1123 8, 1, &keyformat, tx));
1124 VERIFY0(zap_update(mos, dckobj, zfs_prop_to_name(ZFS_PROP_PBKDF2_SALT),
1126 VERIFY0(zap_update(mos, dckobj, zfs_prop_to_name(ZFS_PROP_PBKDF2_ITERS),
1131 dsl_crypto_key_sync(dsl_crypto_key_t *dck, dmu_tx_t *tx)
1133 zio_crypt_key_t *key = &dck->dck_key;
1134 dsl_wrapping_key_t *wkey = dck->dck_wkey;
1135 uint8_t keydata[MASTER_KEY_MAX_LEN];
1136 uint8_t hmac_keydata[SHA512_HMAC_KEYLEN];
1137 uint8_t iv[WRAPPING_IV_LEN];
1138 uint8_t mac[WRAPPING_MAC_LEN];
1140 ASSERT(dmu_tx_is_syncing(tx));
1141 ASSERT3U(key->zk_crypt, <, ZIO_CRYPT_FUNCTIONS);
1143 /* encrypt and store the keys along with the IV and MAC */
1144 VERIFY0(zio_crypt_key_wrap(&dck->dck_wkey->wk_key, key, iv, mac,
1145 keydata, hmac_keydata));
1147 /* update the ZAP with the obtained values */
1148 dsl_crypto_key_sync_impl(tx->tx_pool->dp_meta_objset, dck->dck_obj,
1149 key->zk_crypt, wkey->wk_ddobj, key->zk_guid, iv, mac, keydata,
1150 hmac_keydata, wkey->wk_keyformat, wkey->wk_salt, wkey->wk_iters,
1154 typedef struct spa_keystore_change_key_args {
1155 const char *skcka_dsname;
1156 dsl_crypto_params_t *skcka_cp;
1157 } spa_keystore_change_key_args_t;
1160 spa_keystore_change_key_check(void *arg, dmu_tx_t *tx)
1163 dsl_dir_t *dd = NULL;
1164 dsl_pool_t *dp = dmu_tx_pool(tx);
1165 spa_keystore_change_key_args_t *skcka = arg;
1166 dsl_crypto_params_t *dcp = skcka->skcka_cp;
1169 /* check for the encryption feature */
1170 if (!spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_ENCRYPTION)) {
1171 ret = SET_ERROR(ENOTSUP);
1175 /* check for valid key change command */
1176 if (dcp->cp_cmd != DCP_CMD_NEW_KEY &&
1177 dcp->cp_cmd != DCP_CMD_INHERIT &&
1178 dcp->cp_cmd != DCP_CMD_FORCE_NEW_KEY &&
1179 dcp->cp_cmd != DCP_CMD_FORCE_INHERIT) {
1180 ret = SET_ERROR(EINVAL);
1185 ret = dsl_dir_hold(dp, skcka->skcka_dsname, FTAG, &dd, NULL);
1189 /* verify that the dataset is encrypted */
1190 if (dd->dd_crypto_obj == 0) {
1191 ret = SET_ERROR(EINVAL);
1195 /* clones must always use their origin's key */
1196 if (dsl_dir_is_clone(dd)) {
1197 ret = SET_ERROR(EINVAL);
1201 /* lookup the ddobj we are inheriting the keylocation from */
1202 ret = dsl_dir_get_encryption_root_ddobj(dd, &rddobj);
1206 /* Handle inheritence */
1207 if (dcp->cp_cmd == DCP_CMD_INHERIT ||
1208 dcp->cp_cmd == DCP_CMD_FORCE_INHERIT) {
1209 /* no other encryption params should be given */
1210 if (dcp->cp_crypt != ZIO_CRYPT_INHERIT ||
1211 dcp->cp_keylocation != NULL ||
1212 dcp->cp_wkey != NULL) {
1213 ret = SET_ERROR(EINVAL);
1217 /* check that this is an encryption root */
1218 if (dd->dd_object != rddobj) {
1219 ret = SET_ERROR(EINVAL);
1223 /* check that the parent is encrypted */
1224 if (dd->dd_parent->dd_crypto_obj == 0) {
1225 ret = SET_ERROR(EINVAL);
1229 /* if we are rewrapping check that both keys are loaded */
1230 if (dcp->cp_cmd == DCP_CMD_INHERIT) {
1231 ret = dmu_objset_check_wkey_loaded(dd);
1235 ret = dmu_objset_check_wkey_loaded(dd->dd_parent);
1240 dsl_dir_rele(dd, FTAG);
1244 /* handle forcing an encryption root without rewrapping */
1245 if (dcp->cp_cmd == DCP_CMD_FORCE_NEW_KEY) {
1246 /* no other encryption params should be given */
1247 if (dcp->cp_crypt != ZIO_CRYPT_INHERIT ||
1248 dcp->cp_keylocation != NULL ||
1249 dcp->cp_wkey != NULL) {
1250 ret = SET_ERROR(EINVAL);
1254 /* check that this is not an encryption root */
1255 if (dd->dd_object == rddobj) {
1256 ret = SET_ERROR(EINVAL);
1260 dsl_dir_rele(dd, FTAG);
1264 /* crypt cannot be changed after creation */
1265 if (dcp->cp_crypt != ZIO_CRYPT_INHERIT) {
1266 ret = SET_ERROR(EINVAL);
1270 /* we are not inheritting our parent's wkey so we need one ourselves */
1271 if (dcp->cp_wkey == NULL) {
1272 ret = SET_ERROR(EINVAL);
1276 /* check for a valid keyformat for the new wrapping key */
1277 if (dcp->cp_wkey->wk_keyformat >= ZFS_KEYFORMAT_FORMATS ||
1278 dcp->cp_wkey->wk_keyformat == ZFS_KEYFORMAT_NONE) {
1279 ret = SET_ERROR(EINVAL);
1284 * If this dataset is not currently an encryption root we need a new
1285 * keylocation for this dataset's new wrapping key. Otherwise we can
1286 * just keep the one we already had.
1288 if (dd->dd_object != rddobj && dcp->cp_keylocation == NULL) {
1289 ret = SET_ERROR(EINVAL);
1293 /* check that the keylocation is valid if it is not NULL */
1294 if (dcp->cp_keylocation != NULL &&
1295 !zfs_prop_valid_keylocation(dcp->cp_keylocation, B_TRUE)) {
1296 ret = SET_ERROR(EINVAL);
1300 /* passphrases require pbkdf2 salt and iters */
1301 if (dcp->cp_wkey->wk_keyformat == ZFS_KEYFORMAT_PASSPHRASE) {
1302 if (dcp->cp_wkey->wk_salt == 0 ||
1303 dcp->cp_wkey->wk_iters < MIN_PBKDF2_ITERATIONS) {
1304 ret = SET_ERROR(EINVAL);
1308 if (dcp->cp_wkey->wk_salt != 0 || dcp->cp_wkey->wk_iters != 0) {
1309 ret = SET_ERROR(EINVAL);
1314 /* make sure the dd's wkey is loaded */
1315 ret = dmu_objset_check_wkey_loaded(dd);
1319 dsl_dir_rele(dd, FTAG);
1325 dsl_dir_rele(dd, FTAG);
1332 spa_keystore_change_key_sync_impl(uint64_t rddobj, uint64_t ddobj,
1333 uint64_t new_rddobj, dsl_wrapping_key_t *wkey, dmu_tx_t *tx)
1336 zap_attribute_t *za;
1337 dsl_pool_t *dp = dmu_tx_pool(tx);
1338 dsl_dir_t *dd = NULL;
1339 dsl_crypto_key_t *dck = NULL;
1340 uint64_t curr_rddobj;
1342 ASSERT(RW_WRITE_HELD(&dp->dp_spa->spa_keystore.sk_wkeys_lock));
1345 VERIFY0(dsl_dir_hold_obj(dp, ddobj, NULL, FTAG, &dd));
1347 /* ignore hidden dsl dirs */
1348 if (dd->dd_myname[0] == '$' || dd->dd_myname[0] == '%') {
1349 dsl_dir_rele(dd, FTAG);
1354 * Stop recursing if this dsl dir didn't inherit from the root
1355 * or if this dd is a clone.
1357 VERIFY0(dsl_dir_get_encryption_root_ddobj(dd, &curr_rddobj));
1358 if (curr_rddobj != rddobj || dsl_dir_is_clone(dd)) {
1359 dsl_dir_rele(dd, FTAG);
1364 * If we don't have a wrapping key just update the dck to reflect the
1365 * new encryption root. Otherwise rewrap the entire dck and re-sync it
1369 VERIFY0(zap_update(dp->dp_meta_objset, dd->dd_crypto_obj,
1370 DSL_CRYPTO_KEY_ROOT_DDOBJ, 8, 1, &new_rddobj, tx));
1372 VERIFY0(spa_keystore_dsl_key_hold_dd(dp->dp_spa, dd,
1374 dsl_wrapping_key_hold(wkey, dck);
1375 dsl_wrapping_key_rele(dck->dck_wkey, dck);
1376 dck->dck_wkey = wkey;
1377 dsl_crypto_key_sync(dck, tx);
1378 spa_keystore_dsl_key_rele(dp->dp_spa, dck, FTAG);
1381 zc = kmem_alloc(sizeof (zap_cursor_t), KM_SLEEP);
1382 za = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
1384 /* Recurse into all child dsl dirs. */
1385 for (zap_cursor_init(zc, dp->dp_meta_objset,
1386 dsl_dir_phys(dd)->dd_child_dir_zapobj);
1387 zap_cursor_retrieve(zc, za) == 0;
1388 zap_cursor_advance(zc)) {
1389 spa_keystore_change_key_sync_impl(rddobj,
1390 za->za_first_integer, new_rddobj, wkey, tx);
1392 zap_cursor_fini(zc);
1394 kmem_free(za, sizeof (zap_attribute_t));
1395 kmem_free(zc, sizeof (zap_cursor_t));
1397 dsl_dir_rele(dd, FTAG);
1401 spa_keystore_change_key_sync(void *arg, dmu_tx_t *tx)
1405 dsl_pool_t *dp = dmu_tx_pool(tx);
1406 spa_t *spa = dp->dp_spa;
1407 spa_keystore_change_key_args_t *skcka = arg;
1408 dsl_crypto_params_t *dcp = skcka->skcka_cp;
1409 dsl_wrapping_key_t *wkey = NULL, *found_wkey;
1410 dsl_wrapping_key_t wkey_search;
1411 char *keylocation = dcp->cp_keylocation;
1412 uint64_t rddobj, new_rddobj;
1414 /* create and initialize the wrapping key */
1415 VERIFY0(dsl_dataset_hold(dp, skcka->skcka_dsname, FTAG, &ds));
1416 ASSERT(!ds->ds_is_snapshot);
1418 if (dcp->cp_cmd == DCP_CMD_NEW_KEY ||
1419 dcp->cp_cmd == DCP_CMD_FORCE_NEW_KEY) {
1421 * We are changing to a new wkey. Set additional properties
1422 * which can be sent along with this ioctl. Note that this
1423 * command can set keylocation even if it can't normally be
1424 * set via 'zfs set' due to a non-local keylocation.
1426 if (dcp->cp_cmd == DCP_CMD_NEW_KEY) {
1427 wkey = dcp->cp_wkey;
1428 wkey->wk_ddobj = ds->ds_dir->dd_object;
1430 keylocation = "prompt";
1433 if (keylocation != NULL) {
1434 dsl_prop_set_sync_impl(ds,
1435 zfs_prop_to_name(ZFS_PROP_KEYLOCATION),
1436 ZPROP_SRC_LOCAL, 1, strlen(keylocation) + 1,
1440 VERIFY0(dsl_dir_get_encryption_root_ddobj(ds->ds_dir, &rddobj));
1441 new_rddobj = ds->ds_dir->dd_object;
1444 * We are inheritting the parent's wkey. Unset any local
1445 * keylocation and grab a reference to the wkey.
1447 if (dcp->cp_cmd == DCP_CMD_INHERIT) {
1448 VERIFY0(spa_keystore_wkey_hold_dd(spa,
1449 ds->ds_dir->dd_parent, FTAG, &wkey));
1452 dsl_prop_set_sync_impl(ds,
1453 zfs_prop_to_name(ZFS_PROP_KEYLOCATION), ZPROP_SRC_NONE,
1456 rddobj = ds->ds_dir->dd_object;
1457 VERIFY0(dsl_dir_get_encryption_root_ddobj(ds->ds_dir->dd_parent,
1462 ASSERT(dcp->cp_cmd == DCP_CMD_FORCE_INHERIT ||
1463 dcp->cp_cmd == DCP_CMD_FORCE_NEW_KEY);
1466 rw_enter(&spa->spa_keystore.sk_wkeys_lock, RW_WRITER);
1468 /* recurse through all children and rewrap their keys */
1469 spa_keystore_change_key_sync_impl(rddobj, ds->ds_dir->dd_object,
1470 new_rddobj, wkey, tx);
1473 * All references to the old wkey should be released now (if it
1474 * existed). Replace the wrapping key.
1476 wkey_search.wk_ddobj = ds->ds_dir->dd_object;
1477 found_wkey = avl_find(&spa->spa_keystore.sk_wkeys, &wkey_search, NULL);
1478 if (found_wkey != NULL) {
1479 ASSERT0(refcount_count(&found_wkey->wk_refcnt));
1480 avl_remove(&spa->spa_keystore.sk_wkeys, found_wkey);
1481 dsl_wrapping_key_free(found_wkey);
1484 if (dcp->cp_cmd == DCP_CMD_NEW_KEY) {
1485 avl_find(&spa->spa_keystore.sk_wkeys, wkey, &where);
1486 avl_insert(&spa->spa_keystore.sk_wkeys, wkey, where);
1487 } else if (wkey != NULL) {
1488 dsl_wrapping_key_rele(wkey, FTAG);
1491 rw_exit(&spa->spa_keystore.sk_wkeys_lock);
1493 dsl_dataset_rele(ds, FTAG);
1497 spa_keystore_change_key(const char *dsname, dsl_crypto_params_t *dcp)
1499 spa_keystore_change_key_args_t skcka;
1501 /* initialize the args struct */
1502 skcka.skcka_dsname = dsname;
1503 skcka.skcka_cp = dcp;
1506 * Perform the actual work in syncing context. The blocks modified
1507 * here could be calculated but it would require holding the pool
1508 * lock and tarversing all of the datasets that will have their keys
1511 return (dsl_sync_task(dsname, spa_keystore_change_key_check,
1512 spa_keystore_change_key_sync, &skcka, 15,
1513 ZFS_SPACE_CHECK_RESERVED));
1517 dsl_dir_rename_crypt_check(dsl_dir_t *dd, dsl_dir_t *newparent)
1520 uint64_t curr_rddobj, parent_rddobj;
1522 if (dd->dd_crypto_obj == 0) {
1523 /* children of encrypted parents must be encrypted */
1524 if (newparent->dd_crypto_obj != 0) {
1525 ret = SET_ERROR(EACCES);
1532 ret = dsl_dir_get_encryption_root_ddobj(dd, &curr_rddobj);
1537 * if this is not an encryption root, we must make sure we are not
1538 * moving dd to a new encryption root
1540 if (dd->dd_object != curr_rddobj) {
1541 ret = dsl_dir_get_encryption_root_ddobj(newparent,
1546 if (parent_rddobj != curr_rddobj) {
1547 ret = SET_ERROR(EACCES);
1559 * Check to make sure that a promote from targetdd to origindd will not require
1563 dsl_dataset_promote_crypt_check(dsl_dir_t *target, dsl_dir_t *origin)
1566 uint64_t rddobj, op_rddobj, tp_rddobj;
1568 /* If the dataset is not encrypted we don't need to check anything */
1569 if (origin->dd_crypto_obj == 0)
1573 * If we are not changing the first origin snapshot in a chain
1574 * the encryption root won't change either.
1576 if (dsl_dir_is_clone(origin))
1580 * If the origin is the encryption root we will update
1581 * the DSL Crypto Key to point to the target instead.
1583 ret = dsl_dir_get_encryption_root_ddobj(origin, &rddobj);
1587 if (rddobj == origin->dd_object)
1591 * The origin is inheriting its encryption root from its parent.
1592 * Check that the parent of the target has the same encryption root.
1594 ret = dsl_dir_get_encryption_root_ddobj(origin->dd_parent, &op_rddobj);
1598 ret = dsl_dir_get_encryption_root_ddobj(target->dd_parent, &tp_rddobj);
1602 if (op_rddobj != tp_rddobj)
1603 return (SET_ERROR(EACCES));
1609 dsl_dataset_promote_crypt_sync(dsl_dir_t *target, dsl_dir_t *origin,
1613 dsl_pool_t *dp = target->dd_pool;
1614 dsl_dataset_t *targetds;
1615 dsl_dataset_t *originds;
1618 if (origin->dd_crypto_obj == 0)
1620 if (dsl_dir_is_clone(origin))
1623 VERIFY0(dsl_dir_get_encryption_root_ddobj(origin, &rddobj));
1625 if (rddobj != origin->dd_object)
1629 * If the target is being promoted to the encyrption root update the
1630 * DSL Crypto Key and keylocation to reflect that. We also need to
1631 * update the DSL Crypto Keys of all children inheritting their
1632 * encryption root to point to the new target. Otherwise, the check
1633 * function ensured that the encryption root will not change.
1635 keylocation = kmem_alloc(ZAP_MAXVALUELEN, KM_SLEEP);
1637 VERIFY0(dsl_dataset_hold_obj(dp,
1638 dsl_dir_phys(target)->dd_head_dataset_obj, FTAG, &targetds));
1639 VERIFY0(dsl_dataset_hold_obj(dp,
1640 dsl_dir_phys(origin)->dd_head_dataset_obj, FTAG, &originds));
1642 VERIFY0(dsl_prop_get_dd(origin, zfs_prop_to_name(ZFS_PROP_KEYLOCATION),
1643 1, ZAP_MAXVALUELEN, keylocation, NULL, B_FALSE));
1644 dsl_prop_set_sync_impl(targetds, zfs_prop_to_name(ZFS_PROP_KEYLOCATION),
1645 ZPROP_SRC_LOCAL, 1, strlen(keylocation) + 1, keylocation, tx);
1646 dsl_prop_set_sync_impl(originds, zfs_prop_to_name(ZFS_PROP_KEYLOCATION),
1647 ZPROP_SRC_NONE, 0, 0, NULL, tx);
1649 rw_enter(&dp->dp_spa->spa_keystore.sk_wkeys_lock, RW_WRITER);
1650 spa_keystore_change_key_sync_impl(rddobj, origin->dd_object,
1651 target->dd_object, NULL, tx);
1652 rw_exit(&dp->dp_spa->spa_keystore.sk_wkeys_lock);
1654 dsl_dataset_rele(targetds, FTAG);
1655 dsl_dataset_rele(originds, FTAG);
1656 kmem_free(keylocation, ZAP_MAXVALUELEN);
1660 dmu_objset_clone_crypt_check(dsl_dir_t *parentdd, dsl_dir_t *origindd)
1663 uint64_t pcrypt, crypt;
1666 * Check that we are not making an unencrypted child of an
1669 ret = dsl_dir_get_crypt(parentdd, &pcrypt);
1673 ret = dsl_dir_get_crypt(origindd, &crypt);
1677 ASSERT3U(pcrypt, !=, ZIO_CRYPT_INHERIT);
1678 ASSERT3U(crypt, !=, ZIO_CRYPT_INHERIT);
1680 if (crypt == ZIO_CRYPT_OFF && pcrypt != ZIO_CRYPT_OFF)
1681 return (SET_ERROR(EINVAL));
1688 dmu_objset_create_crypt_check(dsl_dir_t *parentdd, dsl_crypto_params_t *dcp)
1691 uint64_t pcrypt, crypt;
1693 if (dcp->cp_cmd != DCP_CMD_NONE)
1694 return (SET_ERROR(EINVAL));
1696 if (parentdd != NULL) {
1697 ret = dsl_dir_get_crypt(parentdd, &pcrypt);
1701 pcrypt = ZIO_CRYPT_OFF;
1704 crypt = (dcp->cp_crypt == ZIO_CRYPT_INHERIT) ? pcrypt : dcp->cp_crypt;
1706 ASSERT3U(pcrypt, !=, ZIO_CRYPT_INHERIT);
1707 ASSERT3U(crypt, !=, ZIO_CRYPT_INHERIT);
1710 * We can't create an unencrypted child of an encrypted parent
1711 * under any circumstances.
1713 if (crypt == ZIO_CRYPT_OFF && pcrypt != ZIO_CRYPT_OFF)
1714 return (SET_ERROR(EINVAL));
1716 /* check for valid dcp with no encryption (inherited or local) */
1717 if (crypt == ZIO_CRYPT_OFF) {
1718 /* Must not specify encryption params */
1719 if (dcp->cp_wkey != NULL ||
1720 (dcp->cp_keylocation != NULL &&
1721 strcmp(dcp->cp_keylocation, "none") != 0))
1722 return (SET_ERROR(EINVAL));
1728 * We will now definitely be encrypting. Check the feature flag. When
1729 * creating the pool the caller will check this for us since we won't
1730 * technically have the fetaure activated yet.
1732 if (parentdd != NULL &&
1733 !spa_feature_is_enabled(parentdd->dd_pool->dp_spa,
1734 SPA_FEATURE_ENCRYPTION)) {
1735 return (SET_ERROR(EOPNOTSUPP));
1738 /* handle inheritence */
1739 if (dcp->cp_wkey == NULL) {
1740 ASSERT3P(parentdd, !=, NULL);
1742 /* key must be fully unspecified */
1743 if (dcp->cp_keylocation != NULL)
1744 return (SET_ERROR(EINVAL));
1746 /* parent must have a key to inherit */
1747 if (pcrypt == ZIO_CRYPT_OFF)
1748 return (SET_ERROR(EINVAL));
1750 /* check for parent key */
1751 ret = dmu_objset_check_wkey_loaded(parentdd);
1758 /* At this point we should have a fully specified key. Check location */
1759 if (dcp->cp_keylocation == NULL ||
1760 !zfs_prop_valid_keylocation(dcp->cp_keylocation, B_TRUE))
1761 return (SET_ERROR(EINVAL));
1763 /* Must have fully specified keyformat */
1764 switch (dcp->cp_wkey->wk_keyformat) {
1765 case ZFS_KEYFORMAT_HEX:
1766 case ZFS_KEYFORMAT_RAW:
1767 /* requires no pbkdf2 iters and salt */
1768 if (dcp->cp_wkey->wk_salt != 0 || dcp->cp_wkey->wk_iters != 0)
1769 return (SET_ERROR(EINVAL));
1771 case ZFS_KEYFORMAT_PASSPHRASE:
1772 /* requires pbkdf2 iters and salt */
1773 if (dcp->cp_wkey->wk_salt == 0 ||
1774 dcp->cp_wkey->wk_iters < MIN_PBKDF2_ITERATIONS)
1775 return (SET_ERROR(EINVAL));
1777 case ZFS_KEYFORMAT_NONE:
1779 /* keyformat must be specified and valid */
1780 return (SET_ERROR(EINVAL));
1787 dsl_dataset_create_crypt_sync(uint64_t dsobj, dsl_dir_t *dd,
1788 dsl_dataset_t *origin, dsl_crypto_params_t *dcp, dmu_tx_t *tx)
1790 dsl_pool_t *dp = dd->dd_pool;
1792 dsl_wrapping_key_t *wkey;
1794 /* clones always use their origin's wrapping key */
1795 if (dsl_dir_is_clone(dd)) {
1796 ASSERT3P(dcp, ==, NULL);
1799 * If this is an encrypted clone we just need to clone the
1800 * dck into dd. Zapify the dd so we can do that.
1802 if (origin->ds_dir->dd_crypto_obj != 0) {
1803 dmu_buf_will_dirty(dd->dd_dbuf, tx);
1804 dsl_dir_zapify(dd, tx);
1807 dsl_crypto_key_clone_sync(origin->ds_dir, tx);
1808 VERIFY0(zap_add(dp->dp_meta_objset, dd->dd_object,
1809 DD_FIELD_CRYPTO_KEY_OBJ, sizeof (uint64_t), 1,
1810 &dd->dd_crypto_obj, tx));
1817 * A NULL dcp at this point indicates this is the origin dataset
1818 * which does not have an objset to encrypt. Raw receives will handle
1819 * encryption seperately later. In both cases we can simply return.
1821 if (dcp == NULL || dcp->cp_cmd == DCP_CMD_RAW_RECV)
1824 crypt = dcp->cp_crypt;
1825 wkey = dcp->cp_wkey;
1827 /* figure out the effective crypt */
1828 if (crypt == ZIO_CRYPT_INHERIT && dd->dd_parent != NULL)
1829 VERIFY0(dsl_dir_get_crypt(dd->dd_parent, &crypt));
1831 /* if we aren't doing encryption just return */
1832 if (crypt == ZIO_CRYPT_OFF || crypt == ZIO_CRYPT_INHERIT)
1835 /* zapify the dd so that we can add the crypto key obj to it */
1836 dmu_buf_will_dirty(dd->dd_dbuf, tx);
1837 dsl_dir_zapify(dd, tx);
1839 /* use the new key if given or inherit from the parent */
1841 VERIFY0(spa_keystore_wkey_hold_dd(dp->dp_spa,
1842 dd->dd_parent, FTAG, &wkey));
1844 wkey->wk_ddobj = dd->dd_object;
1847 ASSERT3P(wkey, !=, NULL);
1849 /* Create or clone the DSL crypto key and activate the feature */
1850 dd->dd_crypto_obj = dsl_crypto_key_create_sync(crypt, wkey, tx);
1851 VERIFY0(zap_add(dp->dp_meta_objset, dd->dd_object,
1852 DD_FIELD_CRYPTO_KEY_OBJ, sizeof (uint64_t), 1, &dd->dd_crypto_obj,
1854 dsl_dataset_activate_feature(dsobj, SPA_FEATURE_ENCRYPTION, tx);
1857 * If we inherited the wrapping key we release our reference now.
1858 * Otherwise, this is a new key and we need to load it into the
1861 if (dcp->cp_wkey == NULL) {
1862 dsl_wrapping_key_rele(wkey, FTAG);
1864 VERIFY0(spa_keystore_load_wkey_impl(dp->dp_spa, wkey));
1868 typedef struct dsl_crypto_recv_key_arg {
1869 uint64_t dcrka_dsobj;
1870 nvlist_t *dcrka_nvl;
1871 dmu_objset_type_t dcrka_ostype;
1872 } dsl_crypto_recv_key_arg_t;
1875 dsl_crypto_recv_key_check(void *arg, dmu_tx_t *tx)
1878 objset_t *mos = tx->tx_pool->dp_meta_objset;
1881 dsl_crypto_recv_key_arg_t *dcrka = arg;
1882 nvlist_t *nvl = dcrka->dcrka_nvl;
1883 dsl_dataset_t *ds = NULL;
1884 uint8_t *buf = NULL;
1886 uint64_t intval, guid, nlevels, blksz, ibs, nblkptr;
1887 boolean_t is_passphrase = B_FALSE;
1889 ret = dsl_dataset_hold_obj(tx->tx_pool, dcrka->dcrka_dsobj, FTAG, &ds);
1893 ASSERT(dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT);
1896 * Read and check all the encryption values from the nvlist. We need
1897 * all of the fields of a DSL Crypto Key, as well as a fully specified
1900 ret = nvlist_lookup_uint64(nvl, DSL_CRYPTO_KEY_CRYPTO_SUITE, &intval);
1901 if (ret != 0 || intval >= ZIO_CRYPT_FUNCTIONS ||
1902 intval <= ZIO_CRYPT_OFF) {
1903 ret = SET_ERROR(EINVAL);
1907 ret = nvlist_lookup_uint64(nvl, DSL_CRYPTO_KEY_GUID, &intval);
1909 ret = SET_ERROR(EINVAL);
1914 * If this is an incremental receive make sure the given key guid
1915 * matches the one we already have.
1917 if (ds->ds_dir->dd_crypto_obj != 0) {
1918 ret = zap_lookup(mos, ds->ds_dir->dd_crypto_obj,
1919 DSL_CRYPTO_KEY_GUID, 8, 1, &guid);
1923 if (intval != guid) {
1924 ret = SET_ERROR(EACCES);
1929 ret = nvlist_lookup_uint8_array(nvl, DSL_CRYPTO_KEY_MASTER_KEY,
1931 if (ret != 0 || len != MASTER_KEY_MAX_LEN) {
1932 ret = SET_ERROR(EINVAL);
1936 ret = nvlist_lookup_uint8_array(nvl, DSL_CRYPTO_KEY_HMAC_KEY,
1938 if (ret != 0 || len != SHA512_HMAC_KEYLEN) {
1939 ret = SET_ERROR(EINVAL);
1943 ret = nvlist_lookup_uint8_array(nvl, DSL_CRYPTO_KEY_IV, &buf, &len);
1944 if (ret != 0 || len != WRAPPING_IV_LEN) {
1945 ret = SET_ERROR(EINVAL);
1949 ret = nvlist_lookup_uint8_array(nvl, DSL_CRYPTO_KEY_MAC, &buf, &len);
1950 if (ret != 0 || len != WRAPPING_MAC_LEN) {
1951 ret = SET_ERROR(EINVAL);
1956 ret = nvlist_lookup_uint8_array(nvl, "portable_mac", &buf, &len);
1957 if (ret != 0 || len != ZIO_OBJSET_MAC_LEN) {
1958 ret = SET_ERROR(EINVAL);
1962 ret = nvlist_lookup_uint64(nvl, zfs_prop_to_name(ZFS_PROP_KEYFORMAT),
1964 if (ret != 0 || intval >= ZFS_KEYFORMAT_FORMATS ||
1965 intval == ZFS_KEYFORMAT_NONE) {
1966 ret = SET_ERROR(EINVAL);
1970 is_passphrase = (intval == ZFS_KEYFORMAT_PASSPHRASE);
1973 * for raw receives we allow any number of pbkdf2iters since there
1974 * won't be a chance for the user to change it.
1976 ret = nvlist_lookup_uint64(nvl, zfs_prop_to_name(ZFS_PROP_PBKDF2_ITERS),
1978 if (ret != 0 || (is_passphrase == (intval == 0))) {
1979 ret = SET_ERROR(EINVAL);
1983 ret = nvlist_lookup_uint64(nvl, zfs_prop_to_name(ZFS_PROP_PBKDF2_SALT),
1985 if (ret != 0 || (is_passphrase == (intval == 0))) {
1986 ret = SET_ERROR(EINVAL);
1990 /* raw receives also need info about the structure of the metadnode */
1991 ret = nvlist_lookup_uint64(nvl, "mdn_checksum", &intval);
1992 if (ret != 0 || intval >= ZIO_CHECKSUM_LEGACY_FUNCTIONS) {
1993 ret = SET_ERROR(EINVAL);
1997 ret = nvlist_lookup_uint64(nvl, "mdn_compress", &intval);
1998 if (ret != 0 || intval >= ZIO_COMPRESS_LEGACY_FUNCTIONS) {
1999 ret = SET_ERROR(EINVAL);
2003 ret = nvlist_lookup_uint64(nvl, "mdn_nlevels", &nlevels);
2004 if (ret != 0 || nlevels > DN_MAX_LEVELS) {
2005 ret = SET_ERROR(EINVAL);
2009 ret = nvlist_lookup_uint64(nvl, "mdn_blksz", &blksz);
2010 if (ret != 0 || blksz < SPA_MINBLOCKSIZE) {
2011 ret = SET_ERROR(EINVAL);
2013 } else if (blksz > spa_maxblocksize(tx->tx_pool->dp_spa)) {
2014 ret = SET_ERROR(ENOTSUP);
2018 ret = nvlist_lookup_uint64(nvl, "mdn_indblkshift", &ibs);
2019 if (ret != 0 || ibs < DN_MIN_INDBLKSHIFT ||
2020 ibs > DN_MAX_INDBLKSHIFT) {
2021 ret = SET_ERROR(ENOTSUP);
2025 ret = nvlist_lookup_uint64(nvl, "mdn_nblkptr", &nblkptr);
2026 if (ret != 0 || nblkptr != DN_MAX_NBLKPTR) {
2027 ret = SET_ERROR(ENOTSUP);
2031 ret = dmu_objset_from_ds(ds, &os);
2036 * Useraccounting is not portable and must be done with the keys loaded.
2037 * Therefore, whenever we do any kind of receive the useraccounting
2038 * must not be present.
2040 ASSERT0(os->os_flags & OBJSET_FLAG_USERACCOUNTING_COMPLETE);
2041 ASSERT0(os->os_flags & OBJSET_FLAG_USEROBJACCOUNTING_COMPLETE);
2043 mdn = DMU_META_DNODE(os);
2046 * If we already created the objset, make sure its unchangable
2047 * properties match the ones received in the nvlist.
2049 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG);
2050 if (!BP_IS_HOLE(dsl_dataset_get_blkptr(ds)) &&
2051 (mdn->dn_nlevels != nlevels || mdn->dn_datablksz != blksz ||
2052 mdn->dn_indblkshift != ibs || mdn->dn_nblkptr != nblkptr)) {
2053 ret = SET_ERROR(EINVAL);
2056 rrw_exit(&ds->ds_bp_rwlock, FTAG);
2058 dsl_dataset_rele(ds, FTAG);
2063 dsl_dataset_rele(ds, FTAG);
2068 dsl_crypto_recv_key_sync(void *arg, dmu_tx_t *tx)
2070 dsl_crypto_recv_key_arg_t *dcrka = arg;
2071 uint64_t dsobj = dcrka->dcrka_dsobj;
2072 nvlist_t *nvl = dcrka->dcrka_nvl;
2073 dsl_pool_t *dp = tx->tx_pool;
2074 objset_t *mos = dp->dp_meta_objset;
2078 uint8_t *keydata, *hmac_keydata, *iv, *mac, *portable_mac;
2080 uint64_t rddobj, one = 1;
2081 uint64_t crypt, guid, keyformat, iters, salt;
2082 uint64_t compress, checksum, nlevels, blksz, ibs;
2083 char *keylocation = "prompt";
2085 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds));
2086 VERIFY0(dmu_objset_from_ds(ds, &os));
2087 mdn = DMU_META_DNODE(os);
2089 /* lookup the values we need to create the DSL Crypto Key and objset */
2090 crypt = fnvlist_lookup_uint64(nvl, DSL_CRYPTO_KEY_CRYPTO_SUITE);
2091 guid = fnvlist_lookup_uint64(nvl, DSL_CRYPTO_KEY_GUID);
2092 keyformat = fnvlist_lookup_uint64(nvl,
2093 zfs_prop_to_name(ZFS_PROP_KEYFORMAT));
2094 iters = fnvlist_lookup_uint64(nvl,
2095 zfs_prop_to_name(ZFS_PROP_PBKDF2_ITERS));
2096 salt = fnvlist_lookup_uint64(nvl,
2097 zfs_prop_to_name(ZFS_PROP_PBKDF2_SALT));
2098 VERIFY0(nvlist_lookup_uint8_array(nvl, DSL_CRYPTO_KEY_MASTER_KEY,
2100 VERIFY0(nvlist_lookup_uint8_array(nvl, DSL_CRYPTO_KEY_HMAC_KEY,
2101 &hmac_keydata, &len));
2102 VERIFY0(nvlist_lookup_uint8_array(nvl, "portable_mac", &portable_mac,
2104 VERIFY0(nvlist_lookup_uint8_array(nvl, DSL_CRYPTO_KEY_IV, &iv, &len));
2105 VERIFY0(nvlist_lookup_uint8_array(nvl, DSL_CRYPTO_KEY_MAC, &mac, &len));
2106 compress = fnvlist_lookup_uint64(nvl, "mdn_compress");
2107 checksum = fnvlist_lookup_uint64(nvl, "mdn_checksum");
2108 nlevels = fnvlist_lookup_uint64(nvl, "mdn_nlevels");
2109 blksz = fnvlist_lookup_uint64(nvl, "mdn_blksz");
2110 ibs = fnvlist_lookup_uint64(nvl, "mdn_indblkshift");
2112 /* if we haven't created an objset for the ds yet, do that now */
2113 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG);
2114 if (BP_IS_HOLE(dsl_dataset_get_blkptr(ds))) {
2115 (void) dmu_objset_create_impl_dnstats(dp->dp_spa, ds,
2116 dsl_dataset_get_blkptr(ds), dcrka->dcrka_ostype, nlevels,
2119 rrw_exit(&ds->ds_bp_rwlock, FTAG);
2122 * Set the portable MAC. The local MAC will always be zero since the
2123 * incoming data will all be portable and user accounting will be
2124 * deferred until the next mount. Afterwards, flag the os to be
2125 * written out raw next time.
2127 arc_release(os->os_phys_buf, &os->os_phys_buf);
2128 bcopy(portable_mac, os->os_phys->os_portable_mac, ZIO_OBJSET_MAC_LEN);
2129 bzero(os->os_phys->os_local_mac, ZIO_OBJSET_MAC_LEN);
2130 os->os_next_write_raw = B_TRUE;
2132 /* set metadnode compression and checksum */
2133 mdn->dn_compress = compress;
2134 mdn->dn_checksum = checksum;
2135 dsl_dataset_dirty(ds, tx);
2137 /* if this is a new dataset setup the DSL Crypto Key. */
2138 if (ds->ds_dir->dd_crypto_obj == 0) {
2139 /* zapify the dsl dir so we can add the key object to it */
2140 dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx);
2141 dsl_dir_zapify(ds->ds_dir, tx);
2143 /* create the DSL Crypto Key on disk and activate the feature */
2144 ds->ds_dir->dd_crypto_obj = zap_create(mos,
2145 DMU_OTN_ZAP_METADATA, DMU_OT_NONE, 0, tx);
2146 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
2147 ds->ds_dir->dd_crypto_obj, DSL_CRYPTO_KEY_REFCOUNT,
2148 sizeof (uint64_t), 1, &one, tx));
2150 dsl_dataset_activate_feature(dsobj, SPA_FEATURE_ENCRYPTION, tx);
2151 ds->ds_feature_inuse[SPA_FEATURE_ENCRYPTION] = B_TRUE;
2153 /* save the dd_crypto_obj on disk */
2154 VERIFY0(zap_add(mos, ds->ds_dir->dd_object,
2155 DD_FIELD_CRYPTO_KEY_OBJ, sizeof (uint64_t), 1,
2156 &ds->ds_dir->dd_crypto_obj, tx));
2159 * Set the keylocation to prompt by default. If keylocation
2160 * has been provided via the properties, this will be overriden
2163 dsl_prop_set_sync_impl(ds,
2164 zfs_prop_to_name(ZFS_PROP_KEYLOCATION),
2165 ZPROP_SRC_LOCAL, 1, strlen(keylocation) + 1,
2168 rddobj = ds->ds_dir->dd_object;
2170 VERIFY0(dsl_dir_get_encryption_root_ddobj(ds->ds_dir, &rddobj));
2173 /* sync the key data to the ZAP object on disk */
2174 dsl_crypto_key_sync_impl(mos, ds->ds_dir->dd_crypto_obj, crypt,
2175 rddobj, guid, iv, mac, keydata, hmac_keydata, keyformat, salt,
2178 dsl_dataset_rele(ds, FTAG);
2182 * This function is used to sync an nvlist representing a DSL Crypto Key and
2183 * the associated encryption parameters. The key will be written exactly as is
2184 * without wrapping it.
2187 dsl_crypto_recv_key(const char *poolname, uint64_t dsobj,
2188 dmu_objset_type_t ostype, nvlist_t *nvl)
2190 dsl_crypto_recv_key_arg_t dcrka;
2192 dcrka.dcrka_dsobj = dsobj;
2193 dcrka.dcrka_nvl = nvl;
2194 dcrka.dcrka_ostype = ostype;
2196 return (dsl_sync_task(poolname, dsl_crypto_recv_key_check,
2197 dsl_crypto_recv_key_sync, &dcrka, 1, ZFS_SPACE_CHECK_NORMAL));
2201 dsl_crypto_populate_key_nvlist(dsl_dataset_t *ds, nvlist_t **nvl_out)
2207 nvlist_t *nvl = NULL;
2208 uint64_t dckobj = ds->ds_dir->dd_crypto_obj;
2209 dsl_dir_t *rdd = NULL;
2210 dsl_pool_t *dp = ds->ds_dir->dd_pool;
2211 objset_t *mos = dp->dp_meta_objset;
2212 uint64_t crypt = 0, guid = 0, format = 0, iters = 0, salt = 0;
2213 uint8_t raw_keydata[MASTER_KEY_MAX_LEN];
2214 uint8_t raw_hmac_keydata[SHA512_HMAC_KEYLEN];
2215 uint8_t iv[WRAPPING_IV_LEN];
2216 uint8_t mac[WRAPPING_MAC_LEN];
2218 ASSERT(dckobj != 0);
2220 VERIFY0(dmu_objset_from_ds(ds, &os));
2221 mdn = DMU_META_DNODE(os);
2223 ret = nvlist_alloc(&nvl, NV_UNIQUE_NAME, KM_SLEEP);
2227 /* lookup values from the DSL Crypto Key */
2228 ret = zap_lookup(mos, dckobj, DSL_CRYPTO_KEY_CRYPTO_SUITE, 8, 1,
2233 ret = zap_lookup(mos, dckobj, DSL_CRYPTO_KEY_GUID, 8, 1, &guid);
2237 ret = zap_lookup(mos, dckobj, DSL_CRYPTO_KEY_MASTER_KEY, 1,
2238 MASTER_KEY_MAX_LEN, raw_keydata);
2242 ret = zap_lookup(mos, dckobj, DSL_CRYPTO_KEY_HMAC_KEY, 1,
2243 SHA512_HMAC_KEYLEN, raw_hmac_keydata);
2247 ret = zap_lookup(mos, dckobj, DSL_CRYPTO_KEY_IV, 1, WRAPPING_IV_LEN,
2252 ret = zap_lookup(mos, dckobj, DSL_CRYPTO_KEY_MAC, 1, WRAPPING_MAC_LEN,
2258 * Lookup wrapping key properties. An early version of the code did
2259 * not correctly add these values to the wrapping key or the DSL
2260 * Crypto Key on disk for non encryption roots, so to be safe we
2261 * always take the slightly circuitous route of looking it up from
2262 * the encryption root's key.
2264 ret = dsl_dir_get_encryption_root_ddobj(ds->ds_dir, &rddobj);
2268 dsl_pool_config_enter(dp, FTAG);
2270 ret = dsl_dir_hold_obj(dp, rddobj, NULL, FTAG, &rdd);
2274 ret = zap_lookup(dp->dp_meta_objset, rdd->dd_crypto_obj,
2275 zfs_prop_to_name(ZFS_PROP_KEYFORMAT), 8, 1, &format);
2279 if (format == ZFS_KEYFORMAT_PASSPHRASE) {
2280 ret = zap_lookup(dp->dp_meta_objset, rdd->dd_crypto_obj,
2281 zfs_prop_to_name(ZFS_PROP_PBKDF2_ITERS), 8, 1, &iters);
2285 ret = zap_lookup(dp->dp_meta_objset, rdd->dd_crypto_obj,
2286 zfs_prop_to_name(ZFS_PROP_PBKDF2_SALT), 8, 1, &salt);
2291 dsl_dir_rele(rdd, FTAG);
2292 dsl_pool_config_exit(dp, FTAG);
2294 fnvlist_add_uint64(nvl, DSL_CRYPTO_KEY_CRYPTO_SUITE, crypt);
2295 fnvlist_add_uint64(nvl, DSL_CRYPTO_KEY_GUID, guid);
2296 VERIFY0(nvlist_add_uint8_array(nvl, DSL_CRYPTO_KEY_MASTER_KEY,
2297 raw_keydata, MASTER_KEY_MAX_LEN));
2298 VERIFY0(nvlist_add_uint8_array(nvl, DSL_CRYPTO_KEY_HMAC_KEY,
2299 raw_hmac_keydata, SHA512_HMAC_KEYLEN));
2300 VERIFY0(nvlist_add_uint8_array(nvl, DSL_CRYPTO_KEY_IV, iv,
2302 VERIFY0(nvlist_add_uint8_array(nvl, DSL_CRYPTO_KEY_MAC, mac,
2304 VERIFY0(nvlist_add_uint8_array(nvl, "portable_mac",
2305 os->os_phys->os_portable_mac, ZIO_OBJSET_MAC_LEN));
2306 fnvlist_add_uint64(nvl, zfs_prop_to_name(ZFS_PROP_KEYFORMAT), format);
2307 fnvlist_add_uint64(nvl, zfs_prop_to_name(ZFS_PROP_PBKDF2_ITERS), iters);
2308 fnvlist_add_uint64(nvl, zfs_prop_to_name(ZFS_PROP_PBKDF2_SALT), salt);
2309 fnvlist_add_uint64(nvl, "mdn_checksum", mdn->dn_checksum);
2310 fnvlist_add_uint64(nvl, "mdn_compress", mdn->dn_compress);
2311 fnvlist_add_uint64(nvl, "mdn_nlevels", mdn->dn_nlevels);
2312 fnvlist_add_uint64(nvl, "mdn_blksz", mdn->dn_datablksz);
2313 fnvlist_add_uint64(nvl, "mdn_indblkshift", mdn->dn_indblkshift);
2314 fnvlist_add_uint64(nvl, "mdn_nblkptr", mdn->dn_nblkptr);
2320 dsl_pool_config_exit(dp, FTAG);
2323 dsl_dir_rele(rdd, FTAG);
2331 dsl_crypto_key_create_sync(uint64_t crypt, dsl_wrapping_key_t *wkey,
2334 dsl_crypto_key_t dck;
2337 ASSERT(dmu_tx_is_syncing(tx));
2338 ASSERT3U(crypt, <, ZIO_CRYPT_FUNCTIONS);
2339 ASSERT3U(crypt, >, ZIO_CRYPT_OFF);
2341 /* create the DSL Crypto Key ZAP object */
2342 dck.dck_obj = zap_create(tx->tx_pool->dp_meta_objset,
2343 DMU_OTN_ZAP_METADATA, DMU_OT_NONE, 0, tx);
2345 /* fill in the key (on the stack) and sync it to disk */
2346 dck.dck_wkey = wkey;
2347 VERIFY0(zio_crypt_key_init(crypt, &dck.dck_key));
2349 dsl_crypto_key_sync(&dck, tx);
2350 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, dck.dck_obj,
2351 DSL_CRYPTO_KEY_REFCOUNT, sizeof (uint64_t), 1, &one, tx));
2353 zio_crypt_key_destroy(&dck.dck_key);
2354 bzero(&dck.dck_key, sizeof (zio_crypt_key_t));
2356 return (dck.dck_obj);
2360 dsl_crypto_key_clone_sync(dsl_dir_t *origindd, dmu_tx_t *tx)
2362 objset_t *mos = tx->tx_pool->dp_meta_objset;
2364 ASSERT(dmu_tx_is_syncing(tx));
2366 VERIFY0(zap_increment(mos, origindd->dd_crypto_obj,
2367 DSL_CRYPTO_KEY_REFCOUNT, 1, tx));
2369 return (origindd->dd_crypto_obj);
2373 dsl_crypto_key_destroy_sync(uint64_t dckobj, dmu_tx_t *tx)
2375 objset_t *mos = tx->tx_pool->dp_meta_objset;
2378 /* Decrement the refcount, destroy if this is the last reference */
2379 VERIFY0(zap_lookup(mos, dckobj, DSL_CRYPTO_KEY_REFCOUNT,
2380 sizeof (uint64_t), 1, &refcnt));
2383 VERIFY0(zap_increment(mos, dckobj, DSL_CRYPTO_KEY_REFCOUNT,
2386 VERIFY0(zap_destroy(mos, dckobj, tx));
2391 dsl_dataset_crypt_stats(dsl_dataset_t *ds, nvlist_t *nv)
2394 dsl_dir_t *dd = ds->ds_dir;
2395 dsl_dir_t *enc_root;
2396 char buf[ZFS_MAX_DATASET_NAME_LEN];
2398 if (dd->dd_crypto_obj == 0)
2401 intval = dsl_dataset_get_keystatus(dd);
2402 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_KEYSTATUS, intval);
2404 if (dsl_dir_get_crypt(dd, &intval) == 0)
2405 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_ENCRYPTION, intval);
2406 if (zap_lookup(dd->dd_pool->dp_meta_objset, dd->dd_crypto_obj,
2407 DSL_CRYPTO_KEY_GUID, 8, 1, &intval) == 0) {
2408 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_KEY_GUID, intval);
2410 if (zap_lookup(dd->dd_pool->dp_meta_objset, dd->dd_crypto_obj,
2411 zfs_prop_to_name(ZFS_PROP_KEYFORMAT), 8, 1, &intval) == 0) {
2412 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_KEYFORMAT, intval);
2414 if (zap_lookup(dd->dd_pool->dp_meta_objset, dd->dd_crypto_obj,
2415 zfs_prop_to_name(ZFS_PROP_PBKDF2_SALT), 8, 1, &intval) == 0) {
2416 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_PBKDF2_SALT, intval);
2418 if (zap_lookup(dd->dd_pool->dp_meta_objset, dd->dd_crypto_obj,
2419 zfs_prop_to_name(ZFS_PROP_PBKDF2_ITERS), 8, 1, &intval) == 0) {
2420 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_PBKDF2_ITERS, intval);
2423 if (dsl_dir_get_encryption_root_ddobj(dd, &intval) == 0) {
2424 VERIFY0(dsl_dir_hold_obj(dd->dd_pool, intval, NULL, FTAG,
2426 dsl_dir_name(enc_root, buf);
2427 dsl_dir_rele(enc_root, FTAG);
2428 dsl_prop_nvlist_add_string(nv, ZFS_PROP_ENCRYPTION_ROOT, buf);
2433 spa_crypt_get_salt(spa_t *spa, uint64_t dsobj, uint8_t *salt)
2436 dsl_crypto_key_t *dck = NULL;
2438 /* look up the key from the spa's keystore */
2439 ret = spa_keystore_lookup_key(spa, dsobj, FTAG, &dck);
2443 ret = zio_crypt_key_get_salt(&dck->dck_key, salt);
2447 spa_keystore_dsl_key_rele(spa, dck, FTAG);
2452 spa_keystore_dsl_key_rele(spa, dck, FTAG);
2457 * Objset blocks are a special case for MAC generation. These blocks have 2
2458 * 256-bit MACs which are embedded within the block itself, rather than a
2459 * single 128 bit MAC. As a result, this function handles encoding and decoding
2460 * the MACs on its own, unlike other functions in this file.
2463 spa_do_crypt_objset_mac_abd(boolean_t generate, spa_t *spa, uint64_t dsobj,
2464 abd_t *abd, uint_t datalen, boolean_t byteswap)
2467 dsl_crypto_key_t *dck = NULL;
2468 void *buf = abd_borrow_buf_copy(abd, datalen);
2469 objset_phys_t *osp = buf;
2470 uint8_t portable_mac[ZIO_OBJSET_MAC_LEN];
2471 uint8_t local_mac[ZIO_OBJSET_MAC_LEN];
2473 /* look up the key from the spa's keystore */
2474 ret = spa_keystore_lookup_key(spa, dsobj, FTAG, &dck);
2478 /* calculate both HMACs */
2479 ret = zio_crypt_do_objset_hmacs(&dck->dck_key, buf, datalen,
2480 byteswap, portable_mac, local_mac);
2484 spa_keystore_dsl_key_rele(spa, dck, FTAG);
2486 /* if we are generating encode the HMACs in the objset_phys_t */
2488 bcopy(portable_mac, osp->os_portable_mac, ZIO_OBJSET_MAC_LEN);
2489 bcopy(local_mac, osp->os_local_mac, ZIO_OBJSET_MAC_LEN);
2490 abd_return_buf_copy(abd, buf, datalen);
2494 if (bcmp(portable_mac, osp->os_portable_mac, ZIO_OBJSET_MAC_LEN) != 0 ||
2495 bcmp(local_mac, osp->os_local_mac, ZIO_OBJSET_MAC_LEN) != 0) {
2496 abd_return_buf(abd, buf, datalen);
2497 return (SET_ERROR(ECKSUM));
2500 abd_return_buf(abd, buf, datalen);
2506 spa_keystore_dsl_key_rele(spa, dck, FTAG);
2507 abd_return_buf(abd, buf, datalen);
2512 spa_do_crypt_mac_abd(boolean_t generate, spa_t *spa, uint64_t dsobj, abd_t *abd,
2513 uint_t datalen, uint8_t *mac)
2516 dsl_crypto_key_t *dck = NULL;
2517 uint8_t *buf = abd_borrow_buf_copy(abd, datalen);
2518 uint8_t digestbuf[ZIO_DATA_MAC_LEN];
2520 /* look up the key from the spa's keystore */
2521 ret = spa_keystore_lookup_key(spa, dsobj, FTAG, &dck);
2525 /* perform the hmac */
2526 ret = zio_crypt_do_hmac(&dck->dck_key, buf, datalen,
2527 digestbuf, ZIO_DATA_MAC_LEN);
2531 abd_return_buf(abd, buf, datalen);
2532 spa_keystore_dsl_key_rele(spa, dck, FTAG);
2535 * Truncate and fill in mac buffer if we were asked to generate a MAC.
2536 * Otherwise verify that the MAC matched what we expected.
2539 bcopy(digestbuf, mac, ZIO_DATA_MAC_LEN);
2543 if (bcmp(digestbuf, mac, ZIO_DATA_MAC_LEN) != 0)
2544 return (SET_ERROR(ECKSUM));
2550 spa_keystore_dsl_key_rele(spa, dck, FTAG);
2551 abd_return_buf(abd, buf, datalen);
2556 * This function serves as a multiplexer for encryption and decryption of
2557 * all blocks (except the L2ARC). For encryption, it will populate the IV,
2558 * salt, MAC, and cabd (the ciphertext). On decryption it will simply use
2559 * these fields to populate pabd (the plaintext).
2562 spa_do_crypt_abd(boolean_t encrypt, spa_t *spa, uint64_t dsobj,
2563 const blkptr_t *bp, uint64_t txgid, uint_t datalen, abd_t *pabd,
2564 abd_t *cabd, uint8_t *iv, uint8_t *mac, uint8_t *salt, boolean_t *no_crypt)
2567 dmu_object_type_t ot = BP_GET_TYPE(bp);
2568 dsl_crypto_key_t *dck = NULL;
2569 uint8_t *plainbuf = NULL, *cipherbuf = NULL;
2571 ASSERT(spa_feature_is_active(spa, SPA_FEATURE_ENCRYPTION));
2572 ASSERT(!BP_IS_EMBEDDED(bp));
2573 ASSERT(BP_IS_ENCRYPTED(bp));
2575 /* look up the key from the spa's keystore */
2576 ret = spa_keystore_lookup_key(spa, dsobj, FTAG, &dck);
2581 plainbuf = abd_borrow_buf_copy(pabd, datalen);
2582 cipherbuf = abd_borrow_buf(cabd, datalen);
2584 plainbuf = abd_borrow_buf(pabd, datalen);
2585 cipherbuf = abd_borrow_buf_copy(cabd, datalen);
2589 * Both encryption and decryption functions need a salt for key
2590 * generation and an IV. When encrypting a non-dedup block, we
2591 * generate the salt and IV randomly to be stored by the caller. Dedup
2592 * blocks perform a (more expensive) HMAC of the plaintext to obtain
2593 * the salt and the IV. ZIL blocks have their salt and IV generated
2594 * at allocation time in zio_alloc_zil(). On decryption, we simply use
2595 * the provided values.
2597 if (encrypt && ot != DMU_OT_INTENT_LOG && !BP_GET_DEDUP(bp)) {
2598 ret = zio_crypt_key_get_salt(&dck->dck_key, salt);
2602 ret = zio_crypt_generate_iv(iv);
2605 } else if (encrypt && BP_GET_DEDUP(bp)) {
2606 ret = zio_crypt_generate_iv_salt_dedup(&dck->dck_key,
2607 plainbuf, datalen, iv, salt);
2612 /* call lower level function to perform encryption / decryption */
2613 ret = zio_do_crypt_data(encrypt, &dck->dck_key, salt, ot, iv, mac,
2614 datalen, BP_SHOULD_BYTESWAP(bp), plainbuf, cipherbuf, no_crypt);
2619 abd_return_buf(pabd, plainbuf, datalen);
2620 abd_return_buf_copy(cabd, cipherbuf, datalen);
2622 abd_return_buf_copy(pabd, plainbuf, datalen);
2623 abd_return_buf(cabd, cipherbuf, datalen);
2626 spa_keystore_dsl_key_rele(spa, dck, FTAG);
2632 /* zero out any state we might have changed while encrypting */
2633 bzero(salt, ZIO_DATA_SALT_LEN);
2634 bzero(iv, ZIO_DATA_IV_LEN);
2635 bzero(mac, ZIO_DATA_MAC_LEN);
2636 abd_return_buf(pabd, plainbuf, datalen);
2637 abd_return_buf_copy(cabd, cipherbuf, datalen);
2639 abd_return_buf_copy(pabd, plainbuf, datalen);
2640 abd_return_buf(cabd, cipherbuf, datalen);
2643 spa_keystore_dsl_key_rele(spa, dck, FTAG);