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freebsd-dev/module/zfs/dsl_crypt.c
Tom Caputi b0918402dc Raw receive should change key atomically 
Currently, raw zfs sends transfer the encrypted master keys and
objset_phys_t encryption parameters in the DRR_BEGIN payload of
each send file. Both of these are processed as soon as they are
read in dmu_recv_stream(), meaning that the new keys are set
before the new snapshot is received. In addition to the fact that
this changes the user's keys for the dataset earlier than they
might expect, the keys were never reset to what they originally
were in the event that the receive failed. This patch splits the
processing into objset handling and key handling, the later of
which is moved to dmu_recv_end() so that they key change can be
done atomically.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Tom Caputi <tcaputi@datto.com>
Closes #7200
2018-02-21 12:31:03 -08:00

2749 lines
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/*
* CDDL HEADER START
*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2017, Datto, Inc. All rights reserved.
*/
#include <sys/dsl_crypt.h>
#include <sys/dsl_pool.h>
#include <sys/zap.h>
#include <sys/zil.h>
#include <sys/dsl_dir.h>
#include <sys/dsl_prop.h>
#include <sys/spa_impl.h>
#include <sys/dmu_objset.h>
#include <sys/zvol.h>
/*
* This file's primary purpose is for managing master encryption keys in
* memory and on disk. For more info on how these keys are used, see the
* block comment in zio_crypt.c.
*
* All master keys are stored encrypted on disk in the form of the DSL
* Crypto Key ZAP object. The binary key data in this object is always
* randomly generated and is encrypted with the user's wrapping key. This
* layer of indirection allows the user to change their key without
* needing to re-encrypt the entire dataset. The ZAP also holds on to the
* (non-encrypted) encryption algorithm identifier, IV, and MAC needed to
* safely decrypt the master key. For more info on the user's key see the
* block comment in libzfs_crypto.c
*
* In-memory encryption keys are managed through the spa_keystore. The
* keystore consists of 3 AVL trees, which are as follows:
*
* The Wrapping Key Tree:
* The wrapping key (wkey) tree stores the user's keys that are fed into the
* kernel through 'zfs load-key' and related commands. Datasets inherit their
* parent's wkey by default, so these structures are refcounted. The wrapping
* keys remain in memory until they are explicitly unloaded (with
* "zfs unload-key"). Unloading is only possible when no datasets are using
* them (refcount=0).
*
* The DSL Crypto Key Tree:
* The DSL Crypto Keys (DCK) are the in-memory representation of decrypted
* master keys. They are used by the functions in zio_crypt.c to perform
* encryption, decryption, and authentication. Snapshots and clones of a given
* dataset will share a DSL Crypto Key, so they are also refcounted. Once the
* refcount on a key hits zero, it is immediately zeroed out and freed.
*
* The Crypto Key Mapping Tree:
* The zio layer needs to lookup master keys by their dataset object id. Since
* the DSL Crypto Keys can belong to multiple datasets, we maintain a tree of
* dsl_key_mapping_t's which essentially just map the dataset object id to its
* appropriate DSL Crypto Key. The management for creating and destroying these
* mappings hooks into the code for owning and disowning datasets. Usually,
* there will only be one active dataset owner, but there are times
* (particularly during dataset creation and destruction) when this may not be
* true or the dataset may not be initialized enough to own. As a result, this
* object is also refcounted.
*/
static void
dsl_wrapping_key_hold(dsl_wrapping_key_t *wkey, void *tag)
{
(void) refcount_add(&wkey->wk_refcnt, tag);
}
static void
dsl_wrapping_key_rele(dsl_wrapping_key_t *wkey, void *tag)
{
(void) refcount_remove(&wkey->wk_refcnt, tag);
}
static void
dsl_wrapping_key_free(dsl_wrapping_key_t *wkey)
{
ASSERT0(refcount_count(&wkey->wk_refcnt));
if (wkey->wk_key.ck_data) {
bzero(wkey->wk_key.ck_data,
CRYPTO_BITS2BYTES(wkey->wk_key.ck_length));
kmem_free(wkey->wk_key.ck_data,
CRYPTO_BITS2BYTES(wkey->wk_key.ck_length));
}
refcount_destroy(&wkey->wk_refcnt);
kmem_free(wkey, sizeof (dsl_wrapping_key_t));
}
static int
dsl_wrapping_key_create(uint8_t *wkeydata, zfs_keyformat_t keyformat,
uint64_t salt, uint64_t iters, dsl_wrapping_key_t **wkey_out)
{
int ret;
dsl_wrapping_key_t *wkey;
/* allocate the wrapping key */
wkey = kmem_alloc(sizeof (dsl_wrapping_key_t), KM_SLEEP);
if (!wkey)
return (SET_ERROR(ENOMEM));
/* allocate and initialize the underlying crypto key */
wkey->wk_key.ck_data = kmem_alloc(WRAPPING_KEY_LEN, KM_SLEEP);
if (!wkey->wk_key.ck_data) {
ret = ENOMEM;
goto error;
}
wkey->wk_key.ck_format = CRYPTO_KEY_RAW;
wkey->wk_key.ck_length = CRYPTO_BYTES2BITS(WRAPPING_KEY_LEN);
bcopy(wkeydata, wkey->wk_key.ck_data, WRAPPING_KEY_LEN);
/* initialize the rest of the struct */
refcount_create(&wkey->wk_refcnt);
wkey->wk_keyformat = keyformat;
wkey->wk_salt = salt;
wkey->wk_iters = iters;
*wkey_out = wkey;
return (0);
error:
dsl_wrapping_key_free(wkey);
*wkey_out = NULL;
return (ret);
}
int
dsl_crypto_params_create_nvlist(dcp_cmd_t cmd, nvlist_t *props,
nvlist_t *crypto_args, dsl_crypto_params_t **dcp_out)
{
int ret;
uint64_t crypt = ZIO_CRYPT_INHERIT;
uint64_t keyformat = ZFS_KEYFORMAT_NONE;
uint64_t salt = 0, iters = 0;
dsl_crypto_params_t *dcp = NULL;
dsl_wrapping_key_t *wkey = NULL;
uint8_t *wkeydata = NULL;
uint_t wkeydata_len = 0;
char *keylocation = NULL;
dcp = kmem_zalloc(sizeof (dsl_crypto_params_t), KM_SLEEP);
if (!dcp) {
ret = SET_ERROR(ENOMEM);
goto error;
}
dcp->cp_cmd = cmd;
/* get relevant arguments from the nvlists */
if (props != NULL) {
(void) nvlist_lookup_uint64(props,
zfs_prop_to_name(ZFS_PROP_ENCRYPTION), &crypt);
(void) nvlist_lookup_uint64(props,
zfs_prop_to_name(ZFS_PROP_KEYFORMAT), &keyformat);
(void) nvlist_lookup_string(props,
zfs_prop_to_name(ZFS_PROP_KEYLOCATION), &keylocation);
(void) nvlist_lookup_uint64(props,
zfs_prop_to_name(ZFS_PROP_PBKDF2_SALT), &salt);
(void) nvlist_lookup_uint64(props,
zfs_prop_to_name(ZFS_PROP_PBKDF2_ITERS), &iters);
dcp->cp_crypt = crypt;
}
if (crypto_args != NULL) {
(void) nvlist_lookup_uint8_array(crypto_args, "wkeydata",
&wkeydata, &wkeydata_len);
}
/* check for valid command */
if (dcp->cp_cmd >= DCP_CMD_MAX) {
ret = SET_ERROR(EINVAL);
goto error;
} else {
dcp->cp_cmd = cmd;
}
/* check for valid crypt */
if (dcp->cp_crypt >= ZIO_CRYPT_FUNCTIONS) {
ret = SET_ERROR(EINVAL);
goto error;
} else {
dcp->cp_crypt = crypt;
}
/* check for valid keyformat */
if (keyformat >= ZFS_KEYFORMAT_FORMATS) {
ret = SET_ERROR(EINVAL);
goto error;
}
/* check for a valid keylocation (of any kind) and copy it in */
if (keylocation != NULL) {
if (!zfs_prop_valid_keylocation(keylocation, B_FALSE)) {
ret = SET_ERROR(EINVAL);
goto error;
}
dcp->cp_keylocation = spa_strdup(keylocation);
}
/* check wrapping key length, if given */
if (wkeydata != NULL && wkeydata_len != WRAPPING_KEY_LEN) {
ret = SET_ERROR(EINVAL);
goto error;
}
/* if the user asked for the deault crypt, determine that now */
if (dcp->cp_crypt == ZIO_CRYPT_ON)
dcp->cp_crypt = ZIO_CRYPT_ON_VALUE;
/* create the wrapping key from the raw data */
if (wkeydata != NULL) {
/* create the wrapping key with the verified parameters */
ret = dsl_wrapping_key_create(wkeydata, keyformat, salt,
iters, &wkey);
if (ret != 0)
goto error;
dcp->cp_wkey = wkey;
}
/*
* Remove the encryption properties from the nvlist since they are not
* maintained through the DSL.
*/
(void) nvlist_remove_all(props, zfs_prop_to_name(ZFS_PROP_ENCRYPTION));
(void) nvlist_remove_all(props, zfs_prop_to_name(ZFS_PROP_KEYFORMAT));
(void) nvlist_remove_all(props, zfs_prop_to_name(ZFS_PROP_PBKDF2_SALT));
(void) nvlist_remove_all(props,
zfs_prop_to_name(ZFS_PROP_PBKDF2_ITERS));
*dcp_out = dcp;
return (0);
error:
if (wkey != NULL)
dsl_wrapping_key_free(wkey);
if (dcp != NULL)
kmem_free(dcp, sizeof (dsl_crypto_params_t));
*dcp_out = NULL;
return (ret);
}
void
dsl_crypto_params_free(dsl_crypto_params_t *dcp, boolean_t unload)
{
if (dcp == NULL)
return;
if (dcp->cp_keylocation != NULL)
spa_strfree(dcp->cp_keylocation);
if (unload && dcp->cp_wkey != NULL)
dsl_wrapping_key_free(dcp->cp_wkey);
kmem_free(dcp, sizeof (dsl_crypto_params_t));
}
static int
spa_crypto_key_compare(const void *a, const void *b)
{
const dsl_crypto_key_t *dcka = a;
const dsl_crypto_key_t *dckb = b;
if (dcka->dck_obj < dckb->dck_obj)
return (-1);
if (dcka->dck_obj > dckb->dck_obj)
return (1);
return (0);
}
static int
spa_key_mapping_compare(const void *a, const void *b)
{
const dsl_key_mapping_t *kma = a;
const dsl_key_mapping_t *kmb = b;
if (kma->km_dsobj < kmb->km_dsobj)
return (-1);
if (kma->km_dsobj > kmb->km_dsobj)
return (1);
return (0);
}
static int
spa_wkey_compare(const void *a, const void *b)
{
const dsl_wrapping_key_t *wka = a;
const dsl_wrapping_key_t *wkb = b;
if (wka->wk_ddobj < wkb->wk_ddobj)
return (-1);
if (wka->wk_ddobj > wkb->wk_ddobj)
return (1);
return (0);
}
void
spa_keystore_init(spa_keystore_t *sk)
{
rw_init(&sk->sk_dk_lock, NULL, RW_DEFAULT, NULL);
rw_init(&sk->sk_km_lock, NULL, RW_DEFAULT, NULL);
rw_init(&sk->sk_wkeys_lock, NULL, RW_DEFAULT, NULL);
avl_create(&sk->sk_dsl_keys, spa_crypto_key_compare,
sizeof (dsl_crypto_key_t),
offsetof(dsl_crypto_key_t, dck_avl_link));
avl_create(&sk->sk_key_mappings, spa_key_mapping_compare,
sizeof (dsl_key_mapping_t),
offsetof(dsl_key_mapping_t, km_avl_link));
avl_create(&sk->sk_wkeys, spa_wkey_compare, sizeof (dsl_wrapping_key_t),
offsetof(dsl_wrapping_key_t, wk_avl_link));
}
void
spa_keystore_fini(spa_keystore_t *sk)
{
dsl_wrapping_key_t *wkey;
void *cookie = NULL;
ASSERT(avl_is_empty(&sk->sk_dsl_keys));
ASSERT(avl_is_empty(&sk->sk_key_mappings));
while ((wkey = avl_destroy_nodes(&sk->sk_wkeys, &cookie)) != NULL)
dsl_wrapping_key_free(wkey);
avl_destroy(&sk->sk_wkeys);
avl_destroy(&sk->sk_key_mappings);
avl_destroy(&sk->sk_dsl_keys);
rw_destroy(&sk->sk_wkeys_lock);
rw_destroy(&sk->sk_km_lock);
rw_destroy(&sk->sk_dk_lock);
}
static int
dsl_dir_get_encryption_root_ddobj(dsl_dir_t *dd, uint64_t *rddobj)
{
if (dd->dd_crypto_obj == 0)
return (SET_ERROR(ENOENT));
return (zap_lookup(dd->dd_pool->dp_meta_objset, dd->dd_crypto_obj,
DSL_CRYPTO_KEY_ROOT_DDOBJ, 8, 1, rddobj));
}
int
dsl_dir_get_encryption_version(dsl_dir_t *dd, uint64_t *version)
{
*version = 0;
if (dd->dd_crypto_obj == 0)
return (SET_ERROR(ENOENT));
/* version 0 is implied by ENOENT */
(void) zap_lookup(dd->dd_pool->dp_meta_objset, dd->dd_crypto_obj,
DSL_CRYPTO_KEY_VERSION, 8, 1, version);
return (0);
}
boolean_t
dsl_dir_incompatible_encryption_version(dsl_dir_t *dd)
{
int ret;
uint64_t version = 0;
ret = dsl_dir_get_encryption_version(dd, &version);
if (ret != 0)
return (B_FALSE);
return (version != ZIO_CRYPT_KEY_CURRENT_VERSION);
}
static int
spa_keystore_wkey_hold_ddobj_impl(spa_t *spa, uint64_t ddobj,
void *tag, dsl_wrapping_key_t **wkey_out)
{
int ret;
dsl_wrapping_key_t search_wkey;
dsl_wrapping_key_t *found_wkey;
ASSERT(RW_LOCK_HELD(&spa->spa_keystore.sk_wkeys_lock));
/* init the search wrapping key */
search_wkey.wk_ddobj = ddobj;
/* lookup the wrapping key */
found_wkey = avl_find(&spa->spa_keystore.sk_wkeys, &search_wkey, NULL);
if (!found_wkey) {
ret = SET_ERROR(ENOENT);
goto error;
}
/* increment the refcount */
dsl_wrapping_key_hold(found_wkey, tag);
*wkey_out = found_wkey;
return (0);
error:
*wkey_out = NULL;
return (ret);
}
static int
spa_keystore_wkey_hold_dd(spa_t *spa, dsl_dir_t *dd, void *tag,
dsl_wrapping_key_t **wkey_out)
{
int ret;
dsl_wrapping_key_t *wkey;
uint64_t rddobj;
boolean_t locked = B_FALSE;
if (!RW_WRITE_HELD(&spa->spa_keystore.sk_wkeys_lock)) {
rw_enter(&spa->spa_keystore.sk_wkeys_lock, RW_READER);
locked = B_TRUE;
}
/* get the ddobj that the keylocation property was inherited from */
ret = dsl_dir_get_encryption_root_ddobj(dd, &rddobj);
if (ret != 0)
goto error;
/* lookup the wkey in the avl tree */
ret = spa_keystore_wkey_hold_ddobj_impl(spa, rddobj, tag, &wkey);
if (ret != 0)
goto error;
/* unlock the wkey tree if we locked it */
if (locked)
rw_exit(&spa->spa_keystore.sk_wkeys_lock);
*wkey_out = wkey;
return (0);
error:
if (locked)
rw_exit(&spa->spa_keystore.sk_wkeys_lock);
*wkey_out = NULL;
return (ret);
}
int
dsl_crypto_can_set_keylocation(const char *dsname, const char *keylocation)
{
int ret = 0;
dsl_dir_t *dd = NULL;
dsl_pool_t *dp = NULL;
uint64_t rddobj;
/* hold the dsl dir */
ret = dsl_pool_hold(dsname, FTAG, &dp);
if (ret != 0)
goto out;
ret = dsl_dir_hold(dp, dsname, FTAG, &dd, NULL);
if (ret != 0)
goto out;
/* if dd is not encrypted, the value may only be "none" */
if (dd->dd_crypto_obj == 0) {
if (strcmp(keylocation, "none") != 0) {
ret = SET_ERROR(EACCES);
goto out;
}
ret = 0;
goto out;
}
/* check for a valid keylocation for encrypted datasets */
if (!zfs_prop_valid_keylocation(keylocation, B_TRUE)) {
ret = SET_ERROR(EINVAL);
goto out;
}
/* check that this is an encryption root */
ret = dsl_dir_get_encryption_root_ddobj(dd, &rddobj);
if (ret != 0)
goto out;
if (rddobj != dd->dd_object) {
ret = SET_ERROR(EACCES);
goto out;
}
dsl_dir_rele(dd, FTAG);
dsl_pool_rele(dp, FTAG);
return (0);
out:
if (dd != NULL)
dsl_dir_rele(dd, FTAG);
if (dp != NULL)
dsl_pool_rele(dp, FTAG);
return (ret);
}
static void
dsl_crypto_key_free(dsl_crypto_key_t *dck)
{
ASSERT(refcount_count(&dck->dck_holds) == 0);
/* destroy the zio_crypt_key_t */
zio_crypt_key_destroy(&dck->dck_key);
/* free the refcount, wrapping key, and lock */
refcount_destroy(&dck->dck_holds);
if (dck->dck_wkey)
dsl_wrapping_key_rele(dck->dck_wkey, dck);
/* free the key */
kmem_free(dck, sizeof (dsl_crypto_key_t));
}
static void
dsl_crypto_key_rele(dsl_crypto_key_t *dck, void *tag)
{
if (refcount_remove(&dck->dck_holds, tag) == 0)
dsl_crypto_key_free(dck);
}
static int
dsl_crypto_key_open(objset_t *mos, dsl_wrapping_key_t *wkey,
uint64_t dckobj, void *tag, dsl_crypto_key_t **dck_out)
{
int ret;
uint64_t crypt = 0, guid = 0, version = 0;
uint8_t raw_keydata[MASTER_KEY_MAX_LEN];
uint8_t raw_hmac_keydata[SHA512_HMAC_KEYLEN];
uint8_t iv[WRAPPING_IV_LEN];
uint8_t mac[WRAPPING_MAC_LEN];
dsl_crypto_key_t *dck;
/* allocate and initialize the key */
dck = kmem_zalloc(sizeof (dsl_crypto_key_t), KM_SLEEP);
if (!dck)
return (SET_ERROR(ENOMEM));
/* fetch all of the values we need from the ZAP */
ret = zap_lookup(mos, dckobj, DSL_CRYPTO_KEY_CRYPTO_SUITE, 8, 1,
&crypt);
if (ret != 0)
goto error;
ret = zap_lookup(mos, dckobj, DSL_CRYPTO_KEY_GUID, 8, 1, &guid);
if (ret != 0)
goto error;
ret = zap_lookup(mos, dckobj, DSL_CRYPTO_KEY_MASTER_KEY, 1,
MASTER_KEY_MAX_LEN, raw_keydata);
if (ret != 0)
goto error;
ret = zap_lookup(mos, dckobj, DSL_CRYPTO_KEY_HMAC_KEY, 1,
SHA512_HMAC_KEYLEN, raw_hmac_keydata);
if (ret != 0)
goto error;
ret = zap_lookup(mos, dckobj, DSL_CRYPTO_KEY_IV, 1, WRAPPING_IV_LEN,
iv);
if (ret != 0)
goto error;
ret = zap_lookup(mos, dckobj, DSL_CRYPTO_KEY_MAC, 1, WRAPPING_MAC_LEN,
mac);
if (ret != 0)
goto error;
/* the initial on-disk format for encryption did not have a version */
(void) zap_lookup(mos, dckobj, DSL_CRYPTO_KEY_VERSION, 8, 1, &version);
/*
* Unwrap the keys. If there is an error return EACCES to indicate
* an authentication failure.
*/
ret = zio_crypt_key_unwrap(&wkey->wk_key, crypt, version, guid,
raw_keydata, raw_hmac_keydata, iv, mac, &dck->dck_key);
if (ret != 0) {
ret = SET_ERROR(EACCES);
goto error;
}
/* finish initializing the dsl_crypto_key_t */
refcount_create(&dck->dck_holds);
dsl_wrapping_key_hold(wkey, dck);
dck->dck_wkey = wkey;
dck->dck_obj = dckobj;
refcount_add(&dck->dck_holds, tag);
*dck_out = dck;
return (0);
error:
if (dck != NULL) {
bzero(dck, sizeof (dsl_crypto_key_t));
kmem_free(dck, sizeof (dsl_crypto_key_t));
}
*dck_out = NULL;
return (ret);
}
static int
spa_keystore_dsl_key_hold_impl(spa_t *spa, uint64_t dckobj, void *tag,
dsl_crypto_key_t **dck_out)
{
int ret;
dsl_crypto_key_t search_dck;
dsl_crypto_key_t *found_dck;
ASSERT(RW_LOCK_HELD(&spa->spa_keystore.sk_dk_lock));
/* init the search key */
search_dck.dck_obj = dckobj;
/* find the matching key in the keystore */
found_dck = avl_find(&spa->spa_keystore.sk_dsl_keys, &search_dck, NULL);
if (!found_dck) {
ret = SET_ERROR(ENOENT);
goto error;
}
/* increment the refcount */
refcount_add(&found_dck->dck_holds, tag);
*dck_out = found_dck;
return (0);
error:
*dck_out = NULL;
return (ret);
}
static int
spa_keystore_dsl_key_hold_dd(spa_t *spa, dsl_dir_t *dd, void *tag,
dsl_crypto_key_t **dck_out)
{
int ret;
avl_index_t where;
dsl_crypto_key_t *dck_io = NULL, *dck_ks = NULL;
dsl_wrapping_key_t *wkey = NULL;
uint64_t dckobj = dd->dd_crypto_obj;
/* Lookup the key in the tree of currently loaded keys */
rw_enter(&spa->spa_keystore.sk_dk_lock, RW_READER);
ret = spa_keystore_dsl_key_hold_impl(spa, dckobj, tag, &dck_ks);
rw_exit(&spa->spa_keystore.sk_dk_lock);
if (ret == 0) {
*dck_out = dck_ks;
return (0);
}
/* Lookup the wrapping key from the keystore */
ret = spa_keystore_wkey_hold_dd(spa, dd, FTAG, &wkey);
if (ret != 0) {
*dck_out = NULL;
return (SET_ERROR(EACCES));
}
/* Read the key from disk */
ret = dsl_crypto_key_open(spa->spa_meta_objset, wkey, dckobj,
tag, &dck_io);
if (ret != 0) {
dsl_wrapping_key_rele(wkey, FTAG);
*dck_out = NULL;
return (ret);
}
/*
* Add the key to the keystore. It may already exist if it was
* added while performing the read from disk. In this case discard
* it and return the key from the keystore.
*/
rw_enter(&spa->spa_keystore.sk_dk_lock, RW_WRITER);
ret = spa_keystore_dsl_key_hold_impl(spa, dckobj, tag, &dck_ks);
if (ret != 0) {
avl_find(&spa->spa_keystore.sk_dsl_keys, dck_io, &where);
avl_insert(&spa->spa_keystore.sk_dsl_keys, dck_io, where);
*dck_out = dck_io;
} else {
dsl_crypto_key_free(dck_io);
*dck_out = dck_ks;
}
/* Release the wrapping key (the dsl key now has a reference to it) */
dsl_wrapping_key_rele(wkey, FTAG);
rw_exit(&spa->spa_keystore.sk_dk_lock);
return (0);
}
void
spa_keystore_dsl_key_rele(spa_t *spa, dsl_crypto_key_t *dck, void *tag)
{
rw_enter(&spa->spa_keystore.sk_dk_lock, RW_WRITER);
if (refcount_remove(&dck->dck_holds, tag) == 0) {
avl_remove(&spa->spa_keystore.sk_dsl_keys, dck);
dsl_crypto_key_free(dck);
}
rw_exit(&spa->spa_keystore.sk_dk_lock);
}
int
spa_keystore_load_wkey_impl(spa_t *spa, dsl_wrapping_key_t *wkey)
{
int ret;
avl_index_t where;
dsl_wrapping_key_t *found_wkey;
rw_enter(&spa->spa_keystore.sk_wkeys_lock, RW_WRITER);
/* insert the wrapping key into the keystore */
found_wkey = avl_find(&spa->spa_keystore.sk_wkeys, wkey, &where);
if (found_wkey != NULL) {
ret = SET_ERROR(EEXIST);
goto error_unlock;
}
avl_insert(&spa->spa_keystore.sk_wkeys, wkey, where);
rw_exit(&spa->spa_keystore.sk_wkeys_lock);
return (0);
error_unlock:
rw_exit(&spa->spa_keystore.sk_wkeys_lock);
return (ret);
}
int
spa_keystore_load_wkey(const char *dsname, dsl_crypto_params_t *dcp,
boolean_t noop)
{
int ret;
dsl_dir_t *dd = NULL;
dsl_crypto_key_t *dck = NULL;
dsl_wrapping_key_t *wkey = dcp->cp_wkey;
dsl_pool_t *dp = NULL;
uint64_t keyformat, salt, iters;
/*
* We don't validate the wrapping key's keyformat, salt, or iters
* since they will never be needed after the DCK has been wrapped.
*/
if (dcp->cp_wkey == NULL ||
dcp->cp_cmd != DCP_CMD_NONE ||
dcp->cp_crypt != ZIO_CRYPT_INHERIT ||
dcp->cp_keylocation != NULL)
return (SET_ERROR(EINVAL));
ret = dsl_pool_hold(dsname, FTAG, &dp);
if (ret != 0)
goto error;
if (!spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_ENCRYPTION)) {
ret = (SET_ERROR(ENOTSUP));
goto error;
}
/* hold the dsl dir */
ret = dsl_dir_hold(dp, dsname, FTAG, &dd, NULL);
if (ret != 0)
goto error;
/* initialize the wkey's ddobj */
wkey->wk_ddobj = dd->dd_object;
/* verify that the wkey is correct by opening its dsl key */
ret = dsl_crypto_key_open(dp->dp_meta_objset, wkey,
dd->dd_crypto_obj, FTAG, &dck);
if (ret != 0)
goto error;
/* initialize the wkey encryption parameters from the DSL Crypto Key */
ret = zap_lookup(dp->dp_meta_objset, dd->dd_crypto_obj,
zfs_prop_to_name(ZFS_PROP_KEYFORMAT), 8, 1, &keyformat);
if (ret != 0)
goto error;
ret = zap_lookup(dp->dp_meta_objset, dd->dd_crypto_obj,
zfs_prop_to_name(ZFS_PROP_PBKDF2_SALT), 8, 1, &salt);
if (ret != 0)
goto error;
ret = zap_lookup(dp->dp_meta_objset, dd->dd_crypto_obj,
zfs_prop_to_name(ZFS_PROP_PBKDF2_ITERS), 8, 1, &iters);
if (ret != 0)
goto error;
ASSERT3U(keyformat, <, ZFS_KEYFORMAT_FORMATS);
ASSERT3U(keyformat, !=, ZFS_KEYFORMAT_NONE);
IMPLY(keyformat == ZFS_KEYFORMAT_PASSPHRASE, iters != 0);
IMPLY(keyformat == ZFS_KEYFORMAT_PASSPHRASE, salt != 0);
IMPLY(keyformat != ZFS_KEYFORMAT_PASSPHRASE, iters == 0);
IMPLY(keyformat != ZFS_KEYFORMAT_PASSPHRASE, salt == 0);
wkey->wk_keyformat = keyformat;
wkey->wk_salt = salt;
wkey->wk_iters = iters;
/*
* At this point we have verified the wkey and confirmed that it can
* be used to decrypt a DSL Crypto Key. We can simply cleanup and
* return if this is all the user wanted to do.
*/
if (noop)
goto error;
/* insert the wrapping key into the keystore */
ret = spa_keystore_load_wkey_impl(dp->dp_spa, wkey);
if (ret != 0)
goto error;
dsl_crypto_key_rele(dck, FTAG);
dsl_dir_rele(dd, FTAG);
dsl_pool_rele(dp, FTAG);
/* create any zvols under this ds */
zvol_create_minors(dp->dp_spa, dsname, B_TRUE);
return (0);
error:
if (dck != NULL)
dsl_crypto_key_rele(dck, FTAG);
if (dd != NULL)
dsl_dir_rele(dd, FTAG);
if (dp != NULL)
dsl_pool_rele(dp, FTAG);
return (ret);
}
int
spa_keystore_unload_wkey_impl(spa_t *spa, uint64_t ddobj)
{
int ret;
dsl_wrapping_key_t search_wkey;
dsl_wrapping_key_t *found_wkey;
/* init the search wrapping key */
search_wkey.wk_ddobj = ddobj;
rw_enter(&spa->spa_keystore.sk_wkeys_lock, RW_WRITER);
/* remove the wrapping key from the keystore */
found_wkey = avl_find(&spa->spa_keystore.sk_wkeys,
&search_wkey, NULL);
if (!found_wkey) {
ret = SET_ERROR(ENOENT);
goto error_unlock;
} else if (refcount_count(&found_wkey->wk_refcnt) != 0) {
ret = SET_ERROR(EBUSY);
goto error_unlock;
}
avl_remove(&spa->spa_keystore.sk_wkeys, found_wkey);
rw_exit(&spa->spa_keystore.sk_wkeys_lock);
/* free the wrapping key */
dsl_wrapping_key_free(found_wkey);
return (0);
error_unlock:
rw_exit(&spa->spa_keystore.sk_wkeys_lock);
return (ret);
}
int
spa_keystore_unload_wkey(const char *dsname)
{
int ret = 0;
dsl_dir_t *dd = NULL;
dsl_pool_t *dp = NULL;
/* hold the dsl dir */
ret = dsl_pool_hold(dsname, FTAG, &dp);
if (ret != 0)
goto error;
if (!spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_ENCRYPTION)) {
ret = (SET_ERROR(ENOTSUP));
goto error;
}
ret = dsl_dir_hold(dp, dsname, FTAG, &dd, NULL);
if (ret != 0)
goto error;
/* unload the wkey */
ret = spa_keystore_unload_wkey_impl(dp->dp_spa, dd->dd_object);
if (ret != 0)
goto error;
dsl_dir_rele(dd, FTAG);
dsl_pool_rele(dp, FTAG);
/* remove any zvols under this ds */
zvol_remove_minors(dp->dp_spa, dsname, B_TRUE);
return (0);
error:
if (dd != NULL)
dsl_dir_rele(dd, FTAG);
if (dp != NULL)
dsl_pool_rele(dp, FTAG);
return (ret);
}
int
spa_keystore_create_mapping_impl(spa_t *spa, uint64_t dsobj,
dsl_dir_t *dd, void *tag)
{
int ret;
avl_index_t where;
dsl_key_mapping_t *km, *found_km;
boolean_t should_free = B_FALSE;
/* Allocate and initialize the mapping */
km = kmem_zalloc(sizeof (dsl_key_mapping_t), KM_SLEEP);
refcount_create(&km->km_refcnt);
ret = spa_keystore_dsl_key_hold_dd(spa, dd, km, &km->km_key);
if (ret != 0) {
refcount_destroy(&km->km_refcnt);
kmem_free(km, sizeof (dsl_key_mapping_t));
return (ret);
}
km->km_dsobj = dsobj;
rw_enter(&spa->spa_keystore.sk_km_lock, RW_WRITER);
/*
* If a mapping already exists, simply increment its refcount and
* cleanup the one we made. We want to allocate / free outside of
* the lock because this lock is also used by the zio layer to lookup
* key mappings. Otherwise, use the one we created. Normally, there will
* only be one active reference at a time (the objset owner), but there
* are times when there could be multiple async users.
*/
found_km = avl_find(&spa->spa_keystore.sk_key_mappings, km, &where);
if (found_km != NULL) {
should_free = B_TRUE;
refcount_add(&found_km->km_refcnt, tag);
} else {
refcount_add(&km->km_refcnt, tag);
avl_insert(&spa->spa_keystore.sk_key_mappings, km, where);
}
rw_exit(&spa->spa_keystore.sk_km_lock);
if (should_free) {
spa_keystore_dsl_key_rele(spa, km->km_key, km);
refcount_destroy(&km->km_refcnt);
kmem_free(km, sizeof (dsl_key_mapping_t));
}
return (0);
}
int
spa_keystore_create_mapping(spa_t *spa, dsl_dataset_t *ds, void *tag)
{
return (spa_keystore_create_mapping_impl(spa, ds->ds_object,
ds->ds_dir, tag));
}
int
spa_keystore_remove_mapping(spa_t *spa, uint64_t dsobj, void *tag)
{
int ret;
dsl_key_mapping_t search_km;
dsl_key_mapping_t *found_km;
boolean_t should_free = B_FALSE;
/* init the search key mapping */
search_km.km_dsobj = dsobj;
rw_enter(&spa->spa_keystore.sk_km_lock, RW_WRITER);
/* find the matching mapping */
found_km = avl_find(&spa->spa_keystore.sk_key_mappings,
&search_km, NULL);
if (found_km == NULL) {
ret = SET_ERROR(ENOENT);
goto error_unlock;
}
/*
* Decrement the refcount on the mapping and remove it from the tree if
* it is zero. Try to minimize time spent in this lock by deferring
* cleanup work.
*/
if (refcount_remove(&found_km->km_refcnt, tag) == 0) {
should_free = B_TRUE;
avl_remove(&spa->spa_keystore.sk_key_mappings, found_km);
}
rw_exit(&spa->spa_keystore.sk_km_lock);
/* destroy the key mapping */
if (should_free) {
spa_keystore_dsl_key_rele(spa, found_km->km_key, found_km);
kmem_free(found_km, sizeof (dsl_key_mapping_t));
}
return (0);
error_unlock:
rw_exit(&spa->spa_keystore.sk_km_lock);
return (ret);
}
/*
* This function is primarily used by the zio and arc layer to lookup
* DSL Crypto Keys for encryption. Callers must release the key with
* spa_keystore_dsl_key_rele(). The function may also be called with
* dck_out == NULL and tag == NULL to simply check that a key exists
* without getting a reference to it.
*/
int
spa_keystore_lookup_key(spa_t *spa, uint64_t dsobj, void *tag,
dsl_crypto_key_t **dck_out)
{
int ret;
dsl_key_mapping_t search_km;
dsl_key_mapping_t *found_km;
ASSERT((tag != NULL && dck_out != NULL) ||
(tag == NULL && dck_out == NULL));
/* init the search key mapping */
search_km.km_dsobj = dsobj;
rw_enter(&spa->spa_keystore.sk_km_lock, RW_READER);
/* remove the mapping from the tree */
found_km = avl_find(&spa->spa_keystore.sk_key_mappings, &search_km,
NULL);
if (found_km == NULL) {
ret = SET_ERROR(ENOENT);
goto error_unlock;
}
if (found_km && tag)
refcount_add(&found_km->km_key->dck_holds, tag);
rw_exit(&spa->spa_keystore.sk_km_lock);
if (dck_out != NULL)
*dck_out = found_km->km_key;
return (0);
error_unlock:
rw_exit(&spa->spa_keystore.sk_km_lock);
if (dck_out != NULL)
*dck_out = NULL;
return (ret);
}
static int
dmu_objset_check_wkey_loaded(dsl_dir_t *dd)
{
int ret;
dsl_wrapping_key_t *wkey = NULL;
ret = spa_keystore_wkey_hold_dd(dd->dd_pool->dp_spa, dd, FTAG,
&wkey);
if (ret != 0)
return (SET_ERROR(EACCES));
dsl_wrapping_key_rele(wkey, FTAG);
return (0);
}
static zfs_keystatus_t
dsl_dataset_get_keystatus(dsl_dir_t *dd)
{
/* check if this dd has a has a dsl key */
if (dd->dd_crypto_obj == 0)
return (ZFS_KEYSTATUS_NONE);
return (dmu_objset_check_wkey_loaded(dd) == 0 ?
ZFS_KEYSTATUS_AVAILABLE : ZFS_KEYSTATUS_UNAVAILABLE);
}
static int
dsl_dir_get_crypt(dsl_dir_t *dd, uint64_t *crypt)
{
if (dd->dd_crypto_obj == 0) {
*crypt = ZIO_CRYPT_OFF;
return (0);
}
return (zap_lookup(dd->dd_pool->dp_meta_objset, dd->dd_crypto_obj,
DSL_CRYPTO_KEY_CRYPTO_SUITE, 8, 1, crypt));
}
static void
dsl_crypto_key_sync_impl(objset_t *mos, uint64_t dckobj, uint64_t crypt,
uint64_t root_ddobj, uint64_t guid, uint8_t *iv, uint8_t *mac,
uint8_t *keydata, uint8_t *hmac_keydata, uint64_t keyformat,
uint64_t salt, uint64_t iters, dmu_tx_t *tx)
{
VERIFY0(zap_update(mos, dckobj, DSL_CRYPTO_KEY_CRYPTO_SUITE, 8, 1,
&crypt, tx));
VERIFY0(zap_update(mos, dckobj, DSL_CRYPTO_KEY_ROOT_DDOBJ, 8, 1,
&root_ddobj, tx));
VERIFY0(zap_update(mos, dckobj, DSL_CRYPTO_KEY_GUID, 8, 1,
&guid, tx));
VERIFY0(zap_update(mos, dckobj, DSL_CRYPTO_KEY_IV, 1, WRAPPING_IV_LEN,
iv, tx));
VERIFY0(zap_update(mos, dckobj, DSL_CRYPTO_KEY_MAC, 1, WRAPPING_MAC_LEN,
mac, tx));
VERIFY0(zap_update(mos, dckobj, DSL_CRYPTO_KEY_MASTER_KEY, 1,
MASTER_KEY_MAX_LEN, keydata, tx));
VERIFY0(zap_update(mos, dckobj, DSL_CRYPTO_KEY_HMAC_KEY, 1,
SHA512_HMAC_KEYLEN, hmac_keydata, tx));
VERIFY0(zap_update(mos, dckobj, zfs_prop_to_name(ZFS_PROP_KEYFORMAT),
8, 1, &keyformat, tx));
VERIFY0(zap_update(mos, dckobj, zfs_prop_to_name(ZFS_PROP_PBKDF2_SALT),
8, 1, &salt, tx));
VERIFY0(zap_update(mos, dckobj, zfs_prop_to_name(ZFS_PROP_PBKDF2_ITERS),
8, 1, &iters, tx));
}
static void
dsl_crypto_key_sync(dsl_crypto_key_t *dck, dmu_tx_t *tx)
{
zio_crypt_key_t *key = &dck->dck_key;
dsl_wrapping_key_t *wkey = dck->dck_wkey;
uint8_t keydata[MASTER_KEY_MAX_LEN];
uint8_t hmac_keydata[SHA512_HMAC_KEYLEN];
uint8_t iv[WRAPPING_IV_LEN];
uint8_t mac[WRAPPING_MAC_LEN];
ASSERT(dmu_tx_is_syncing(tx));
ASSERT3U(key->zk_crypt, <, ZIO_CRYPT_FUNCTIONS);
/* encrypt and store the keys along with the IV and MAC */
VERIFY0(zio_crypt_key_wrap(&dck->dck_wkey->wk_key, key, iv, mac,
keydata, hmac_keydata));
/* update the ZAP with the obtained values */
dsl_crypto_key_sync_impl(tx->tx_pool->dp_meta_objset, dck->dck_obj,
key->zk_crypt, wkey->wk_ddobj, key->zk_guid, iv, mac, keydata,
hmac_keydata, wkey->wk_keyformat, wkey->wk_salt, wkey->wk_iters,
tx);
}
typedef struct spa_keystore_change_key_args {
const char *skcka_dsname;
dsl_crypto_params_t *skcka_cp;
} spa_keystore_change_key_args_t;
static int
spa_keystore_change_key_check(void *arg, dmu_tx_t *tx)
{
int ret;
dsl_dir_t *dd = NULL;
dsl_pool_t *dp = dmu_tx_pool(tx);
spa_keystore_change_key_args_t *skcka = arg;
dsl_crypto_params_t *dcp = skcka->skcka_cp;
uint64_t rddobj;
/* check for the encryption feature */
if (!spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_ENCRYPTION)) {
ret = SET_ERROR(ENOTSUP);
goto error;
}
/* check for valid key change command */
if (dcp->cp_cmd != DCP_CMD_NEW_KEY &&
dcp->cp_cmd != DCP_CMD_INHERIT &&
dcp->cp_cmd != DCP_CMD_FORCE_NEW_KEY &&
dcp->cp_cmd != DCP_CMD_FORCE_INHERIT) {
ret = SET_ERROR(EINVAL);
goto error;
}
/* hold the dd */
ret = dsl_dir_hold(dp, skcka->skcka_dsname, FTAG, &dd, NULL);
if (ret != 0)
goto error;
/* verify that the dataset is encrypted */
if (dd->dd_crypto_obj == 0) {
ret = SET_ERROR(EINVAL);
goto error;
}
/* clones must always use their origin's key */
if (dsl_dir_is_clone(dd)) {
ret = SET_ERROR(EINVAL);
goto error;
}
/* lookup the ddobj we are inheriting the keylocation from */
ret = dsl_dir_get_encryption_root_ddobj(dd, &rddobj);
if (ret != 0)
goto error;
/* Handle inheritence */
if (dcp->cp_cmd == DCP_CMD_INHERIT ||
dcp->cp_cmd == DCP_CMD_FORCE_INHERIT) {
/* no other encryption params should be given */
if (dcp->cp_crypt != ZIO_CRYPT_INHERIT ||
dcp->cp_keylocation != NULL ||
dcp->cp_wkey != NULL) {
ret = SET_ERROR(EINVAL);
goto error;
}
/* check that this is an encryption root */
if (dd->dd_object != rddobj) {
ret = SET_ERROR(EINVAL);
goto error;
}
/* check that the parent is encrypted */
if (dd->dd_parent->dd_crypto_obj == 0) {
ret = SET_ERROR(EINVAL);
goto error;
}
/* if we are rewrapping check that both keys are loaded */
if (dcp->cp_cmd == DCP_CMD_INHERIT) {
ret = dmu_objset_check_wkey_loaded(dd);
if (ret != 0)
goto error;
ret = dmu_objset_check_wkey_loaded(dd->dd_parent);
if (ret != 0)
goto error;
}
dsl_dir_rele(dd, FTAG);
return (0);
}
/* handle forcing an encryption root without rewrapping */
if (dcp->cp_cmd == DCP_CMD_FORCE_NEW_KEY) {
/* no other encryption params should be given */
if (dcp->cp_crypt != ZIO_CRYPT_INHERIT ||
dcp->cp_keylocation != NULL ||
dcp->cp_wkey != NULL) {
ret = SET_ERROR(EINVAL);
goto error;
}
/* check that this is not an encryption root */
if (dd->dd_object == rddobj) {
ret = SET_ERROR(EINVAL);
goto error;
}
dsl_dir_rele(dd, FTAG);
return (0);
}
/* crypt cannot be changed after creation */
if (dcp->cp_crypt != ZIO_CRYPT_INHERIT) {
ret = SET_ERROR(EINVAL);
goto error;
}
/* we are not inheritting our parent's wkey so we need one ourselves */
if (dcp->cp_wkey == NULL) {
ret = SET_ERROR(EINVAL);
goto error;
}
/* check for a valid keyformat for the new wrapping key */
if (dcp->cp_wkey->wk_keyformat >= ZFS_KEYFORMAT_FORMATS ||
dcp->cp_wkey->wk_keyformat == ZFS_KEYFORMAT_NONE) {
ret = SET_ERROR(EINVAL);
goto error;
}
/*
* If this dataset is not currently an encryption root we need a new
* keylocation for this dataset's new wrapping key. Otherwise we can
* just keep the one we already had.
*/
if (dd->dd_object != rddobj && dcp->cp_keylocation == NULL) {
ret = SET_ERROR(EINVAL);
goto error;
}
/* check that the keylocation is valid if it is not NULL */
if (dcp->cp_keylocation != NULL &&
!zfs_prop_valid_keylocation(dcp->cp_keylocation, B_TRUE)) {
ret = SET_ERROR(EINVAL);
goto error;
}
/* passphrases require pbkdf2 salt and iters */
if (dcp->cp_wkey->wk_keyformat == ZFS_KEYFORMAT_PASSPHRASE) {
if (dcp->cp_wkey->wk_salt == 0 ||
dcp->cp_wkey->wk_iters < MIN_PBKDF2_ITERATIONS) {
ret = SET_ERROR(EINVAL);
goto error;
}
} else {
if (dcp->cp_wkey->wk_salt != 0 || dcp->cp_wkey->wk_iters != 0) {
ret = SET_ERROR(EINVAL);
goto error;
}
}
/* make sure the dd's wkey is loaded */
ret = dmu_objset_check_wkey_loaded(dd);
if (ret != 0)
goto error;
dsl_dir_rele(dd, FTAG);
return (0);
error:
if (dd != NULL)
dsl_dir_rele(dd, FTAG);
return (ret);
}
static void
spa_keystore_change_key_sync_impl(uint64_t rddobj, uint64_t ddobj,
uint64_t new_rddobj, dsl_wrapping_key_t *wkey, dmu_tx_t *tx)
{
zap_cursor_t *zc;
zap_attribute_t *za;
dsl_pool_t *dp = dmu_tx_pool(tx);
dsl_dir_t *dd = NULL;
dsl_crypto_key_t *dck = NULL;
uint64_t curr_rddobj;
ASSERT(RW_WRITE_HELD(&dp->dp_spa->spa_keystore.sk_wkeys_lock));
/* hold the dd */
VERIFY0(dsl_dir_hold_obj(dp, ddobj, NULL, FTAG, &dd));
/* ignore hidden dsl dirs */
if (dd->dd_myname[0] == '$' || dd->dd_myname[0] == '%') {
dsl_dir_rele(dd, FTAG);
return;
}
/*
* Stop recursing if this dsl dir didn't inherit from the root
* or if this dd is a clone.
*/
VERIFY0(dsl_dir_get_encryption_root_ddobj(dd, &curr_rddobj));
if (curr_rddobj != rddobj || dsl_dir_is_clone(dd)) {
dsl_dir_rele(dd, FTAG);
return;
}
/*
* If we don't have a wrapping key just update the dck to reflect the
* new encryption root. Otherwise rewrap the entire dck and re-sync it
* to disk.
*/
if (wkey == NULL) {
VERIFY0(zap_update(dp->dp_meta_objset, dd->dd_crypto_obj,
DSL_CRYPTO_KEY_ROOT_DDOBJ, 8, 1, &new_rddobj, tx));
} else {
VERIFY0(spa_keystore_dsl_key_hold_dd(dp->dp_spa, dd,
FTAG, &dck));
dsl_wrapping_key_hold(wkey, dck);
dsl_wrapping_key_rele(dck->dck_wkey, dck);
dck->dck_wkey = wkey;
dsl_crypto_key_sync(dck, tx);
spa_keystore_dsl_key_rele(dp->dp_spa, dck, FTAG);
}
zc = kmem_alloc(sizeof (zap_cursor_t), KM_SLEEP);
za = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP);
/* Recurse into all child dsl dirs. */
for (zap_cursor_init(zc, dp->dp_meta_objset,
dsl_dir_phys(dd)->dd_child_dir_zapobj);
zap_cursor_retrieve(zc, za) == 0;
zap_cursor_advance(zc)) {
spa_keystore_change_key_sync_impl(rddobj,
za->za_first_integer, new_rddobj, wkey, tx);
}
zap_cursor_fini(zc);
kmem_free(za, sizeof (zap_attribute_t));
kmem_free(zc, sizeof (zap_cursor_t));
dsl_dir_rele(dd, FTAG);
}
static void
spa_keystore_change_key_sync(void *arg, dmu_tx_t *tx)
{
dsl_dataset_t *ds;
avl_index_t where;
dsl_pool_t *dp = dmu_tx_pool(tx);
spa_t *spa = dp->dp_spa;
spa_keystore_change_key_args_t *skcka = arg;
dsl_crypto_params_t *dcp = skcka->skcka_cp;
dsl_wrapping_key_t *wkey = NULL, *found_wkey;
dsl_wrapping_key_t wkey_search;
char *keylocation = dcp->cp_keylocation;
uint64_t rddobj, new_rddobj;
/* create and initialize the wrapping key */
VERIFY0(dsl_dataset_hold(dp, skcka->skcka_dsname, FTAG, &ds));
ASSERT(!ds->ds_is_snapshot);
if (dcp->cp_cmd == DCP_CMD_NEW_KEY ||
dcp->cp_cmd == DCP_CMD_FORCE_NEW_KEY) {
/*
* We are changing to a new wkey. Set additional properties
* which can be sent along with this ioctl. Note that this
* command can set keylocation even if it can't normally be
* set via 'zfs set' due to a non-local keylocation.
*/
if (dcp->cp_cmd == DCP_CMD_NEW_KEY) {
wkey = dcp->cp_wkey;
wkey->wk_ddobj = ds->ds_dir->dd_object;
} else {
keylocation = "prompt";
}
if (keylocation != NULL) {
dsl_prop_set_sync_impl(ds,
zfs_prop_to_name(ZFS_PROP_KEYLOCATION),
ZPROP_SRC_LOCAL, 1, strlen(keylocation) + 1,
keylocation, tx);
}
VERIFY0(dsl_dir_get_encryption_root_ddobj(ds->ds_dir, &rddobj));
new_rddobj = ds->ds_dir->dd_object;
} else {
/*
* We are inheritting the parent's wkey. Unset any local
* keylocation and grab a reference to the wkey.
*/
if (dcp->cp_cmd == DCP_CMD_INHERIT) {
VERIFY0(spa_keystore_wkey_hold_dd(spa,
ds->ds_dir->dd_parent, FTAG, &wkey));
}
dsl_prop_set_sync_impl(ds,
zfs_prop_to_name(ZFS_PROP_KEYLOCATION), ZPROP_SRC_NONE,
0, 0, NULL, tx);
rddobj = ds->ds_dir->dd_object;
VERIFY0(dsl_dir_get_encryption_root_ddobj(ds->ds_dir->dd_parent,
&new_rddobj));
}
if (wkey == NULL) {
ASSERT(dcp->cp_cmd == DCP_CMD_FORCE_INHERIT ||
dcp->cp_cmd == DCP_CMD_FORCE_NEW_KEY);
}
rw_enter(&spa->spa_keystore.sk_wkeys_lock, RW_WRITER);
/* recurse through all children and rewrap their keys */
spa_keystore_change_key_sync_impl(rddobj, ds->ds_dir->dd_object,
new_rddobj, wkey, tx);
/*
* All references to the old wkey should be released now (if it
* existed). Replace the wrapping key.
*/
wkey_search.wk_ddobj = ds->ds_dir->dd_object;
found_wkey = avl_find(&spa->spa_keystore.sk_wkeys, &wkey_search, NULL);
if (found_wkey != NULL) {
ASSERT0(refcount_count(&found_wkey->wk_refcnt));
avl_remove(&spa->spa_keystore.sk_wkeys, found_wkey);
dsl_wrapping_key_free(found_wkey);
}
if (dcp->cp_cmd == DCP_CMD_NEW_KEY) {
avl_find(&spa->spa_keystore.sk_wkeys, wkey, &where);
avl_insert(&spa->spa_keystore.sk_wkeys, wkey, where);
} else if (wkey != NULL) {
dsl_wrapping_key_rele(wkey, FTAG);
}
rw_exit(&spa->spa_keystore.sk_wkeys_lock);
dsl_dataset_rele(ds, FTAG);
}
int
spa_keystore_change_key(const char *dsname, dsl_crypto_params_t *dcp)
{
spa_keystore_change_key_args_t skcka;
/* initialize the args struct */
skcka.skcka_dsname = dsname;
skcka.skcka_cp = dcp;
/*
* Perform the actual work in syncing context. The blocks modified
* here could be calculated but it would require holding the pool
* lock and tarversing all of the datasets that will have their keys
* changed.
*/
return (dsl_sync_task(dsname, spa_keystore_change_key_check,
spa_keystore_change_key_sync, &skcka, 15,
ZFS_SPACE_CHECK_RESERVED));
}
int
dsl_dir_rename_crypt_check(dsl_dir_t *dd, dsl_dir_t *newparent)
{
int ret;
uint64_t curr_rddobj, parent_rddobj;
if (dd->dd_crypto_obj == 0) {
/* children of encrypted parents must be encrypted */
if (newparent->dd_crypto_obj != 0) {
ret = SET_ERROR(EACCES);
goto error;
}
return (0);
}
ret = dsl_dir_get_encryption_root_ddobj(dd, &curr_rddobj);
if (ret != 0)
goto error;
/*
* if this is not an encryption root, we must make sure we are not
* moving dd to a new encryption root
*/
if (dd->dd_object != curr_rddobj) {
ret = dsl_dir_get_encryption_root_ddobj(newparent,
&parent_rddobj);
if (ret != 0)
goto error;
if (parent_rddobj != curr_rddobj) {
ret = SET_ERROR(EACCES);
goto error;
}
}
return (0);
error:
return (ret);
}
/*
* Check to make sure that a promote from targetdd to origindd will not require
* any key rewraps.
*/
int
dsl_dataset_promote_crypt_check(dsl_dir_t *target, dsl_dir_t *origin)
{
int ret;
uint64_t rddobj, op_rddobj, tp_rddobj;
/* If the dataset is not encrypted we don't need to check anything */
if (origin->dd_crypto_obj == 0)
return (0);
/*
* If we are not changing the first origin snapshot in a chain
* the encryption root won't change either.
*/
if (dsl_dir_is_clone(origin))
return (0);
/*
* If the origin is the encryption root we will update
* the DSL Crypto Key to point to the target instead.
*/
ret = dsl_dir_get_encryption_root_ddobj(origin, &rddobj);
if (ret != 0)
return (ret);
if (rddobj == origin->dd_object)
return (0);
/*
* The origin is inheriting its encryption root from its parent.
* Check that the parent of the target has the same encryption root.
*/
ret = dsl_dir_get_encryption_root_ddobj(origin->dd_parent, &op_rddobj);
if (ret != 0)
return (ret);
ret = dsl_dir_get_encryption_root_ddobj(target->dd_parent, &tp_rddobj);
if (ret != 0)
return (ret);
if (op_rddobj != tp_rddobj)
return (SET_ERROR(EACCES));
return (0);
}
void
dsl_dataset_promote_crypt_sync(dsl_dir_t *target, dsl_dir_t *origin,
dmu_tx_t *tx)
{
uint64_t rddobj;
dsl_pool_t *dp = target->dd_pool;
dsl_dataset_t *targetds;
dsl_dataset_t *originds;
char *keylocation;
if (origin->dd_crypto_obj == 0)
return;
if (dsl_dir_is_clone(origin))
return;
VERIFY0(dsl_dir_get_encryption_root_ddobj(origin, &rddobj));
if (rddobj != origin->dd_object)
return;
/*
* If the target is being promoted to the encyrption root update the
* DSL Crypto Key and keylocation to reflect that. We also need to
* update the DSL Crypto Keys of all children inheritting their
* encryption root to point to the new target. Otherwise, the check
* function ensured that the encryption root will not change.
*/
keylocation = kmem_alloc(ZAP_MAXVALUELEN, KM_SLEEP);
VERIFY0(dsl_dataset_hold_obj(dp,
dsl_dir_phys(target)->dd_head_dataset_obj, FTAG, &targetds));
VERIFY0(dsl_dataset_hold_obj(dp,
dsl_dir_phys(origin)->dd_head_dataset_obj, FTAG, &originds));
VERIFY0(dsl_prop_get_dd(origin, zfs_prop_to_name(ZFS_PROP_KEYLOCATION),
1, ZAP_MAXVALUELEN, keylocation, NULL, B_FALSE));
dsl_prop_set_sync_impl(targetds, zfs_prop_to_name(ZFS_PROP_KEYLOCATION),
ZPROP_SRC_LOCAL, 1, strlen(keylocation) + 1, keylocation, tx);
dsl_prop_set_sync_impl(originds, zfs_prop_to_name(ZFS_PROP_KEYLOCATION),
ZPROP_SRC_NONE, 0, 0, NULL, tx);
rw_enter(&dp->dp_spa->spa_keystore.sk_wkeys_lock, RW_WRITER);
spa_keystore_change_key_sync_impl(rddobj, origin->dd_object,
target->dd_object, NULL, tx);
rw_exit(&dp->dp_spa->spa_keystore.sk_wkeys_lock);
dsl_dataset_rele(targetds, FTAG);
dsl_dataset_rele(originds, FTAG);
kmem_free(keylocation, ZAP_MAXVALUELEN);
}
int
dmu_objset_clone_crypt_check(dsl_dir_t *parentdd, dsl_dir_t *origindd)
{
int ret;
uint64_t pcrypt, crypt;
/*
* Check that we are not making an unencrypted child of an
* encrypted parent.
*/
ret = dsl_dir_get_crypt(parentdd, &pcrypt);
if (ret != 0)
return (ret);
ret = dsl_dir_get_crypt(origindd, &crypt);
if (ret != 0)
return (ret);
ASSERT3U(pcrypt, !=, ZIO_CRYPT_INHERIT);
ASSERT3U(crypt, !=, ZIO_CRYPT_INHERIT);
if (crypt == ZIO_CRYPT_OFF && pcrypt != ZIO_CRYPT_OFF)
return (SET_ERROR(EINVAL));
return (0);
}
int
dmu_objset_create_crypt_check(dsl_dir_t *parentdd, dsl_crypto_params_t *dcp)
{
int ret;
uint64_t pcrypt, crypt;
if (dcp->cp_cmd != DCP_CMD_NONE)
return (SET_ERROR(EINVAL));
if (parentdd != NULL) {
ret = dsl_dir_get_crypt(parentdd, &pcrypt);
if (ret != 0)
return (ret);
} else {
pcrypt = ZIO_CRYPT_OFF;
}
crypt = (dcp->cp_crypt == ZIO_CRYPT_INHERIT) ? pcrypt : dcp->cp_crypt;
ASSERT3U(pcrypt, !=, ZIO_CRYPT_INHERIT);
ASSERT3U(crypt, !=, ZIO_CRYPT_INHERIT);
/*
* We can't create an unencrypted child of an encrypted parent
* under any circumstances.
*/
if (crypt == ZIO_CRYPT_OFF && pcrypt != ZIO_CRYPT_OFF)
return (SET_ERROR(EINVAL));
/* check for valid dcp with no encryption (inherited or local) */
if (crypt == ZIO_CRYPT_OFF) {
/* Must not specify encryption params */
if (dcp->cp_wkey != NULL ||
(dcp->cp_keylocation != NULL &&
strcmp(dcp->cp_keylocation, "none") != 0))
return (SET_ERROR(EINVAL));
return (0);
}
/*
* We will now definitely be encrypting. Check the feature flag. When
* creating the pool the caller will check this for us since we won't
* technically have the fetaure activated yet.
*/
if (parentdd != NULL &&
!spa_feature_is_enabled(parentdd->dd_pool->dp_spa,
SPA_FEATURE_ENCRYPTION)) {
return (SET_ERROR(EOPNOTSUPP));
}
/* handle inheritence */
if (dcp->cp_wkey == NULL) {
ASSERT3P(parentdd, !=, NULL);
/* key must be fully unspecified */
if (dcp->cp_keylocation != NULL)
return (SET_ERROR(EINVAL));
/* parent must have a key to inherit */
if (pcrypt == ZIO_CRYPT_OFF)
return (SET_ERROR(EINVAL));
/* check for parent key */
ret = dmu_objset_check_wkey_loaded(parentdd);
if (ret != 0)
return (ret);
return (0);
}
/* At this point we should have a fully specified key. Check location */
if (dcp->cp_keylocation == NULL ||
!zfs_prop_valid_keylocation(dcp->cp_keylocation, B_TRUE))
return (SET_ERROR(EINVAL));
/* Must have fully specified keyformat */
switch (dcp->cp_wkey->wk_keyformat) {
case ZFS_KEYFORMAT_HEX:
case ZFS_KEYFORMAT_RAW:
/* requires no pbkdf2 iters and salt */
if (dcp->cp_wkey->wk_salt != 0 || dcp->cp_wkey->wk_iters != 0)
return (SET_ERROR(EINVAL));
break;
case ZFS_KEYFORMAT_PASSPHRASE:
/* requires pbkdf2 iters and salt */
if (dcp->cp_wkey->wk_salt == 0 ||
dcp->cp_wkey->wk_iters < MIN_PBKDF2_ITERATIONS)
return (SET_ERROR(EINVAL));
break;
case ZFS_KEYFORMAT_NONE:
default:
/* keyformat must be specified and valid */
return (SET_ERROR(EINVAL));
}
return (0);
}
void
dsl_dataset_create_crypt_sync(uint64_t dsobj, dsl_dir_t *dd,
dsl_dataset_t *origin, dsl_crypto_params_t *dcp, dmu_tx_t *tx)
{
dsl_pool_t *dp = dd->dd_pool;
uint64_t crypt;
dsl_wrapping_key_t *wkey;
/* clones always use their origin's wrapping key */
if (dsl_dir_is_clone(dd)) {
ASSERT3P(dcp, ==, NULL);
/*
* If this is an encrypted clone we just need to clone the
* dck into dd. Zapify the dd so we can do that.
*/
if (origin->ds_dir->dd_crypto_obj != 0) {
dmu_buf_will_dirty(dd->dd_dbuf, tx);
dsl_dir_zapify(dd, tx);
dd->dd_crypto_obj =
dsl_crypto_key_clone_sync(origin->ds_dir, tx);
VERIFY0(zap_add(dp->dp_meta_objset, dd->dd_object,
DD_FIELD_CRYPTO_KEY_OBJ, sizeof (uint64_t), 1,
&dd->dd_crypto_obj, tx));
}
return;
}
/*
* A NULL dcp at this point indicates this is the origin dataset
* which does not have an objset to encrypt. Raw receives will handle
* encryption separately later. In both cases we can simply return.
*/
if (dcp == NULL || dcp->cp_cmd == DCP_CMD_RAW_RECV)
return;
crypt = dcp->cp_crypt;
wkey = dcp->cp_wkey;
/* figure out the effective crypt */
if (crypt == ZIO_CRYPT_INHERIT && dd->dd_parent != NULL)
VERIFY0(dsl_dir_get_crypt(dd->dd_parent, &crypt));
/* if we aren't doing encryption just return */
if (crypt == ZIO_CRYPT_OFF || crypt == ZIO_CRYPT_INHERIT)
return;
/* zapify the dd so that we can add the crypto key obj to it */
dmu_buf_will_dirty(dd->dd_dbuf, tx);
dsl_dir_zapify(dd, tx);
/* use the new key if given or inherit from the parent */
if (wkey == NULL) {
VERIFY0(spa_keystore_wkey_hold_dd(dp->dp_spa,
dd->dd_parent, FTAG, &wkey));
} else {
wkey->wk_ddobj = dd->dd_object;
}
ASSERT3P(wkey, !=, NULL);
/* Create or clone the DSL crypto key and activate the feature */
dd->dd_crypto_obj = dsl_crypto_key_create_sync(crypt, wkey, tx);
VERIFY0(zap_add(dp->dp_meta_objset, dd->dd_object,
DD_FIELD_CRYPTO_KEY_OBJ, sizeof (uint64_t), 1, &dd->dd_crypto_obj,
tx));
dsl_dataset_activate_feature(dsobj, SPA_FEATURE_ENCRYPTION, tx);
/*
* If we inherited the wrapping key we release our reference now.
* Otherwise, this is a new key and we need to load it into the
* keystore.
*/
if (dcp->cp_wkey == NULL) {
dsl_wrapping_key_rele(wkey, FTAG);
} else {
VERIFY0(spa_keystore_load_wkey_impl(dp->dp_spa, wkey));
}
}
typedef struct dsl_crypto_recv_key_arg {
uint64_t dcrka_dsobj;
dmu_objset_type_t dcrka_ostype;
nvlist_t *dcrka_nvl;
boolean_t dcrka_do_key;
} dsl_crypto_recv_key_arg_t;
static int
dsl_crypto_recv_raw_objset_check(dsl_dataset_t *ds, dmu_objset_type_t ostype,
nvlist_t *nvl, dmu_tx_t *tx)
{
int ret;
objset_t *os;
dnode_t *mdn;
uint8_t *buf = NULL;
uint_t len;
uint64_t intval, nlevels, blksz, ibs, nblkptr, maxblkid;
if (ostype != DMU_OST_ZFS && ostype != DMU_OST_ZVOL)
return (SET_ERROR(EINVAL));
/* raw receives also need info about the structure of the metadnode */
ret = nvlist_lookup_uint64(nvl, "mdn_compress", &intval);
if (ret != 0 || intval >= ZIO_COMPRESS_LEGACY_FUNCTIONS)
return (SET_ERROR(EINVAL));
ret = nvlist_lookup_uint64(nvl, "mdn_checksum", &intval);
if (ret != 0 || intval >= ZIO_CHECKSUM_LEGACY_FUNCTIONS)
return (SET_ERROR(EINVAL));
ret = nvlist_lookup_uint64(nvl, "mdn_nlevels", &nlevels);
if (ret != 0 || nlevels > DN_MAX_LEVELS)
return (SET_ERROR(EINVAL));
ret = nvlist_lookup_uint64(nvl, "mdn_blksz", &blksz);
if (ret != 0 || blksz < SPA_MINBLOCKSIZE)
return (SET_ERROR(EINVAL));
else if (blksz > spa_maxblocksize(tx->tx_pool->dp_spa))
return (SET_ERROR(ENOTSUP));
ret = nvlist_lookup_uint64(nvl, "mdn_indblkshift", &ibs);
if (ret != 0 || ibs < DN_MIN_INDBLKSHIFT || ibs > DN_MAX_INDBLKSHIFT)
return (SET_ERROR(ENOTSUP));
ret = nvlist_lookup_uint64(nvl, "mdn_nblkptr", &nblkptr);
if (ret != 0 || nblkptr != DN_MAX_NBLKPTR)
return (SET_ERROR(ENOTSUP));
ret = nvlist_lookup_uint64(nvl, "mdn_maxblkid", &maxblkid);
if (ret != 0)
return (SET_ERROR(EINVAL));
ret = nvlist_lookup_uint8_array(nvl, "portable_mac", &buf, &len);
if (ret != 0 || len != ZIO_OBJSET_MAC_LEN)
return (SET_ERROR(EINVAL));
ret = dmu_objset_from_ds(ds, &os);
if (ret != 0)
return (ret);
/*
* Useraccounting is not portable and must be done with the keys loaded.
* Therefore, whenever we do any kind of receive the useraccounting
* must not be present.
*/
ASSERT0(os->os_flags & OBJSET_FLAG_USERACCOUNTING_COMPLETE);
ASSERT0(os->os_flags & OBJSET_FLAG_USEROBJACCOUNTING_COMPLETE);
mdn = DMU_META_DNODE(os);
/*
* If we already created the objset, make sure its unchangeable
* properties match the ones received in the nvlist.
*/
rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG);
if (!BP_IS_HOLE(dsl_dataset_get_blkptr(ds)) &&
(mdn->dn_nlevels != nlevels || mdn->dn_datablksz != blksz ||
mdn->dn_indblkshift != ibs || mdn->dn_nblkptr != nblkptr)) {
rrw_exit(&ds->ds_bp_rwlock, FTAG);
return (SET_ERROR(EINVAL));
}
rrw_exit(&ds->ds_bp_rwlock, FTAG);
return (0);
}
static void
dsl_crypto_recv_raw_objset_sync(dsl_dataset_t *ds, dmu_objset_type_t ostype,
nvlist_t *nvl, dmu_tx_t *tx)
{
dsl_pool_t *dp = tx->tx_pool;
objset_t *os;
dnode_t *mdn;
zio_t *zio;
uint8_t *portable_mac;
uint_t len;
uint64_t compress, checksum, nlevels, blksz, ibs, maxblkid;
boolean_t newds = B_FALSE;
VERIFY0(dmu_objset_from_ds(ds, &os));
mdn = DMU_META_DNODE(os);
/* fetch the values we need from the nvlist */
compress = fnvlist_lookup_uint64(nvl, "mdn_compress");
checksum = fnvlist_lookup_uint64(nvl, "mdn_checksum");
nlevels = fnvlist_lookup_uint64(nvl, "mdn_nlevels");
blksz = fnvlist_lookup_uint64(nvl, "mdn_blksz");
ibs = fnvlist_lookup_uint64(nvl, "mdn_indblkshift");
maxblkid = fnvlist_lookup_uint64(nvl, "mdn_maxblkid");
VERIFY0(nvlist_lookup_uint8_array(nvl, "portable_mac", &portable_mac,
&len));
/* if we haven't created an objset for the ds yet, do that now */
rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG);
if (BP_IS_HOLE(dsl_dataset_get_blkptr(ds))) {
(void) dmu_objset_create_impl_dnstats(dp->dp_spa, ds,
dsl_dataset_get_blkptr(ds), ostype, nlevels, blksz,
ibs, tx);
newds = B_TRUE;
}
rrw_exit(&ds->ds_bp_rwlock, FTAG);
/*
* Set the portable MAC. The local MAC will always be zero since the
* incoming data will all be portable and user accounting will be
* deferred until the next mount. Afterwards, flag the os to be
* written out raw next time.
*/
arc_release(os->os_phys_buf, &os->os_phys_buf);
bcopy(portable_mac, os->os_phys->os_portable_mac, ZIO_OBJSET_MAC_LEN);
bzero(os->os_phys->os_local_mac, ZIO_OBJSET_MAC_LEN);
os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_TRUE;
/* set metadnode compression and checksum */
mdn->dn_compress = compress;
mdn->dn_checksum = checksum;
rw_enter(&mdn->dn_struct_rwlock, RW_WRITER);
dnode_new_blkid(mdn, maxblkid, tx, B_FALSE);
rw_exit(&mdn->dn_struct_rwlock);
/*
* We can't normally dirty the dataset in syncing context unless
* we are creating a new dataset. In this case, we perform a
* pseudo txg sync here instead.
*/
if (newds) {
dsl_dataset_dirty(ds, tx);
} else {
zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED);
dsl_dataset_sync(ds, zio, tx);
VERIFY0(zio_wait(zio));
/* dsl_dataset_sync_done will drop this reference. */
dmu_buf_add_ref(ds->ds_dbuf, ds);
dsl_dataset_sync_done(ds, tx);
}
}
int
dsl_crypto_recv_raw_key_check(dsl_dataset_t *ds, nvlist_t *nvl, dmu_tx_t *tx)
{
int ret;
objset_t *mos = tx->tx_pool->dp_meta_objset;
uint8_t *buf = NULL;
uint_t len;
uint64_t intval, guid, version;
boolean_t is_passphrase = B_FALSE;
ASSERT(dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT);
/*
* Read and check all the encryption values from the nvlist. We need
* all of the fields of a DSL Crypto Key, as well as a fully specified
* wrapping key.
*/
ret = nvlist_lookup_uint64(nvl, DSL_CRYPTO_KEY_CRYPTO_SUITE, &intval);
if (ret != 0 || intval >= ZIO_CRYPT_FUNCTIONS ||
intval <= ZIO_CRYPT_OFF)
return (SET_ERROR(EINVAL));
ret = nvlist_lookup_uint64(nvl, DSL_CRYPTO_KEY_GUID, &intval);
if (ret != 0)
return (SET_ERROR(EINVAL));
/*
* If this is an incremental receive make sure the given key guid
* matches the one we already have.
*/
if (ds->ds_dir->dd_crypto_obj != 0) {
ret = zap_lookup(mos, ds->ds_dir->dd_crypto_obj,
DSL_CRYPTO_KEY_GUID, 8, 1, &guid);
if (ret != 0)
return (ret);
if (intval != guid)
return (SET_ERROR(EACCES));
}
ret = nvlist_lookup_uint8_array(nvl, DSL_CRYPTO_KEY_MASTER_KEY,
&buf, &len);
if (ret != 0 || len != MASTER_KEY_MAX_LEN)
return (SET_ERROR(EINVAL));
ret = nvlist_lookup_uint8_array(nvl, DSL_CRYPTO_KEY_HMAC_KEY,
&buf, &len);
if (ret != 0 || len != SHA512_HMAC_KEYLEN)
return (SET_ERROR(EINVAL));
ret = nvlist_lookup_uint8_array(nvl, DSL_CRYPTO_KEY_IV, &buf, &len);
if (ret != 0 || len != WRAPPING_IV_LEN)
return (SET_ERROR(EINVAL));
ret = nvlist_lookup_uint8_array(nvl, DSL_CRYPTO_KEY_MAC, &buf, &len);
if (ret != 0 || len != WRAPPING_MAC_LEN)
return (SET_ERROR(EINVAL));
/*
* We don't support receiving old on-disk formats. The version 0
* implementation protected several fields in an objset that were
* not always portable during a raw receive. As a result, we call
* the old version an on-disk errata #3.
*/
ret = nvlist_lookup_uint64(nvl, DSL_CRYPTO_KEY_VERSION, &version);
if (ret != 0 || version != ZIO_CRYPT_KEY_CURRENT_VERSION)
return (SET_ERROR(ENOTSUP));
ret = nvlist_lookup_uint64(nvl, zfs_prop_to_name(ZFS_PROP_KEYFORMAT),
&intval);
if (ret != 0 || intval >= ZFS_KEYFORMAT_FORMATS ||
intval == ZFS_KEYFORMAT_NONE)
return (SET_ERROR(EINVAL));
is_passphrase = (intval == ZFS_KEYFORMAT_PASSPHRASE);
/*
* for raw receives we allow any number of pbkdf2iters since there
* won't be a chance for the user to change it.
*/
ret = nvlist_lookup_uint64(nvl, zfs_prop_to_name(ZFS_PROP_PBKDF2_ITERS),
&intval);
if (ret != 0 || (is_passphrase == (intval == 0)))
return (SET_ERROR(EINVAL));
ret = nvlist_lookup_uint64(nvl, zfs_prop_to_name(ZFS_PROP_PBKDF2_SALT),
&intval);
if (ret != 0 || (is_passphrase == (intval == 0)))
return (SET_ERROR(EINVAL));
return (0);
}
void
dsl_crypto_recv_raw_key_sync(dsl_dataset_t *ds, nvlist_t *nvl, dmu_tx_t *tx)
{
dsl_pool_t *dp = tx->tx_pool;
objset_t *mos = dp->dp_meta_objset;
dsl_dir_t *dd = ds->ds_dir;
uint_t len;
uint64_t rddobj, one = 1;
uint8_t *keydata, *hmac_keydata, *iv, *mac;
uint64_t crypt, guid, keyformat, iters, salt;
uint64_t version = ZIO_CRYPT_KEY_CURRENT_VERSION;
char *keylocation = "prompt";
/* lookup the values we need to create the DSL Crypto Key */
crypt = fnvlist_lookup_uint64(nvl, DSL_CRYPTO_KEY_CRYPTO_SUITE);
guid = fnvlist_lookup_uint64(nvl, DSL_CRYPTO_KEY_GUID);
keyformat = fnvlist_lookup_uint64(nvl,
zfs_prop_to_name(ZFS_PROP_KEYFORMAT));
iters = fnvlist_lookup_uint64(nvl,
zfs_prop_to_name(ZFS_PROP_PBKDF2_ITERS));
salt = fnvlist_lookup_uint64(nvl,
zfs_prop_to_name(ZFS_PROP_PBKDF2_SALT));
VERIFY0(nvlist_lookup_uint8_array(nvl, DSL_CRYPTO_KEY_MASTER_KEY,
&keydata, &len));
VERIFY0(nvlist_lookup_uint8_array(nvl, DSL_CRYPTO_KEY_HMAC_KEY,
&hmac_keydata, &len));
VERIFY0(nvlist_lookup_uint8_array(nvl, DSL_CRYPTO_KEY_IV, &iv, &len));
VERIFY0(nvlist_lookup_uint8_array(nvl, DSL_CRYPTO_KEY_MAC, &mac, &len));
/* if this is a new dataset setup the DSL Crypto Key. */
if (dd->dd_crypto_obj == 0) {
/* zapify the dsl dir so we can add the key object to it */
dmu_buf_will_dirty(dd->dd_dbuf, tx);
dsl_dir_zapify(dd, tx);
/* create the DSL Crypto Key on disk and activate the feature */
dd->dd_crypto_obj = zap_create(mos,
DMU_OTN_ZAP_METADATA, DMU_OT_NONE, 0, tx);
VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
dd->dd_crypto_obj, DSL_CRYPTO_KEY_REFCOUNT,
sizeof (uint64_t), 1, &one, tx));
VERIFY0(zap_update(tx->tx_pool->dp_meta_objset,
dd->dd_crypto_obj, DSL_CRYPTO_KEY_VERSION,
sizeof (uint64_t), 1, &version, tx));
dsl_dataset_activate_feature(ds->ds_object,
SPA_FEATURE_ENCRYPTION, tx);
ds->ds_feature_inuse[SPA_FEATURE_ENCRYPTION] = B_TRUE;
/* save the dd_crypto_obj on disk */
VERIFY0(zap_add(mos, dd->dd_object, DD_FIELD_CRYPTO_KEY_OBJ,
sizeof (uint64_t), 1, &dd->dd_crypto_obj, tx));
/*
* Set the keylocation to prompt by default. If keylocation
* has been provided via the properties, this will be overridden
* later.
*/
dsl_prop_set_sync_impl(ds,
zfs_prop_to_name(ZFS_PROP_KEYLOCATION),
ZPROP_SRC_LOCAL, 1, strlen(keylocation) + 1,
keylocation, tx);
rddobj = dd->dd_object;
} else {
VERIFY0(dsl_dir_get_encryption_root_ddobj(dd, &rddobj));
}
/* sync the key data to the ZAP object on disk */
dsl_crypto_key_sync_impl(mos, dd->dd_crypto_obj, crypt,
rddobj, guid, iv, mac, keydata, hmac_keydata, keyformat, salt,
iters, tx);
}
int
dsl_crypto_recv_key_check(void *arg, dmu_tx_t *tx)
{
int ret;
dsl_crypto_recv_key_arg_t *dcrka = arg;
dsl_dataset_t *ds = NULL;
ret = dsl_dataset_hold_obj(tx->tx_pool, dcrka->dcrka_dsobj,
FTAG, &ds);
if (ret != 0)
goto error;
ret = dsl_crypto_recv_raw_objset_check(ds,
dcrka->dcrka_ostype, dcrka->dcrka_nvl, tx);
if (ret != 0)
goto error;
/*
* We run this check even if we won't be doing this part of
* the receive now so that we don't make the user wait until
* the receive finishes to fail.
*/
ret = dsl_crypto_recv_raw_key_check(ds, dcrka->dcrka_nvl, tx);
if (ret != 0)
goto error;
dsl_dataset_rele(ds, FTAG);
return (0);
error:
if (ds != NULL)
dsl_dataset_rele(ds, FTAG);
return (ret);
}
void
dsl_crypto_recv_key_sync(void *arg, dmu_tx_t *tx)
{
dsl_crypto_recv_key_arg_t *dcrka = arg;
dsl_dataset_t *ds;
VERIFY0(dsl_dataset_hold_obj(tx->tx_pool, dcrka->dcrka_dsobj,
FTAG, &ds));
dsl_crypto_recv_raw_objset_sync(ds, dcrka->dcrka_ostype,
dcrka->dcrka_nvl, tx);
if (dcrka->dcrka_do_key)
dsl_crypto_recv_raw_key_sync(ds, dcrka->dcrka_nvl, tx);
dsl_dataset_rele(ds, FTAG);
}
/*
* This function is used to sync an nvlist representing a DSL Crypto Key and
* the associated encryption parameters. The key will be written exactly as is
* without wrapping it.
*/
int
dsl_crypto_recv_raw(const char *poolname, uint64_t dsobj,
dmu_objset_type_t ostype, nvlist_t *nvl, boolean_t do_key)
{
dsl_crypto_recv_key_arg_t dcrka;
dcrka.dcrka_dsobj = dsobj;
dcrka.dcrka_ostype = ostype;
dcrka.dcrka_nvl = nvl;
dcrka.dcrka_do_key = do_key;
return (dsl_sync_task(poolname, dsl_crypto_recv_key_check,
dsl_crypto_recv_key_sync, &dcrka, 1, ZFS_SPACE_CHECK_NORMAL));
}
int
dsl_crypto_populate_key_nvlist(dsl_dataset_t *ds, nvlist_t **nvl_out)
{
int ret;
objset_t *os;
dnode_t *mdn;
uint64_t rddobj;
nvlist_t *nvl = NULL;
uint64_t dckobj = ds->ds_dir->dd_crypto_obj;
dsl_dir_t *rdd = NULL;
dsl_pool_t *dp = ds->ds_dir->dd_pool;
objset_t *mos = dp->dp_meta_objset;
uint64_t crypt = 0, guid = 0, format = 0;
uint64_t iters = 0, salt = 0, version = 0;
uint8_t raw_keydata[MASTER_KEY_MAX_LEN];
uint8_t raw_hmac_keydata[SHA512_HMAC_KEYLEN];
uint8_t iv[WRAPPING_IV_LEN];
uint8_t mac[WRAPPING_MAC_LEN];
ASSERT(dckobj != 0);
VERIFY0(dmu_objset_from_ds(ds, &os));
mdn = DMU_META_DNODE(os);
ret = nvlist_alloc(&nvl, NV_UNIQUE_NAME, KM_SLEEP);
if (ret != 0)
goto error;
/* lookup values from the DSL Crypto Key */
ret = zap_lookup(mos, dckobj, DSL_CRYPTO_KEY_CRYPTO_SUITE, 8, 1,
&crypt);
if (ret != 0)
goto error;
ret = zap_lookup(mos, dckobj, DSL_CRYPTO_KEY_GUID, 8, 1, &guid);
if (ret != 0)
goto error;
ret = zap_lookup(mos, dckobj, DSL_CRYPTO_KEY_MASTER_KEY, 1,
MASTER_KEY_MAX_LEN, raw_keydata);
if (ret != 0)
goto error;
ret = zap_lookup(mos, dckobj, DSL_CRYPTO_KEY_HMAC_KEY, 1,
SHA512_HMAC_KEYLEN, raw_hmac_keydata);
if (ret != 0)
goto error;
ret = zap_lookup(mos, dckobj, DSL_CRYPTO_KEY_IV, 1, WRAPPING_IV_LEN,
iv);
if (ret != 0)
goto error;
ret = zap_lookup(mos, dckobj, DSL_CRYPTO_KEY_MAC, 1, WRAPPING_MAC_LEN,
mac);
if (ret != 0)
goto error;
/*
* We don't support raw sends of legacy on-disk formats. See the
* comment in dsl_crypto_recv_key_check() for details.
*/
ret = zap_lookup(mos, dckobj, DSL_CRYPTO_KEY_VERSION, 8, 1, &version);
if (ret != 0 || version != ZIO_CRYPT_KEY_CURRENT_VERSION) {
dp->dp_spa->spa_errata = ZPOOL_ERRATA_ZOL_6845_ENCRYPTION;
ret = SET_ERROR(ENOTSUP);
goto error;
}
/*
* Lookup wrapping key properties. An early version of the code did
* not correctly add these values to the wrapping key or the DSL
* Crypto Key on disk for non encryption roots, so to be safe we
* always take the slightly circuitous route of looking it up from
* the encryption root's key.
*/
ret = dsl_dir_get_encryption_root_ddobj(ds->ds_dir, &rddobj);
if (ret != 0)
goto error;
dsl_pool_config_enter(dp, FTAG);
ret = dsl_dir_hold_obj(dp, rddobj, NULL, FTAG, &rdd);
if (ret != 0)
goto error_unlock;
ret = zap_lookup(dp->dp_meta_objset, rdd->dd_crypto_obj,
zfs_prop_to_name(ZFS_PROP_KEYFORMAT), 8, 1, &format);
if (ret != 0)
goto error_unlock;
if (format == ZFS_KEYFORMAT_PASSPHRASE) {
ret = zap_lookup(dp->dp_meta_objset, rdd->dd_crypto_obj,
zfs_prop_to_name(ZFS_PROP_PBKDF2_ITERS), 8, 1, &iters);
if (ret != 0)
goto error_unlock;
ret = zap_lookup(dp->dp_meta_objset, rdd->dd_crypto_obj,
zfs_prop_to_name(ZFS_PROP_PBKDF2_SALT), 8, 1, &salt);
if (ret != 0)
goto error_unlock;
}
dsl_dir_rele(rdd, FTAG);
dsl_pool_config_exit(dp, FTAG);
fnvlist_add_uint64(nvl, DSL_CRYPTO_KEY_CRYPTO_SUITE, crypt);
fnvlist_add_uint64(nvl, DSL_CRYPTO_KEY_GUID, guid);
fnvlist_add_uint64(nvl, DSL_CRYPTO_KEY_VERSION, version);
VERIFY0(nvlist_add_uint8_array(nvl, DSL_CRYPTO_KEY_MASTER_KEY,
raw_keydata, MASTER_KEY_MAX_LEN));
VERIFY0(nvlist_add_uint8_array(nvl, DSL_CRYPTO_KEY_HMAC_KEY,
raw_hmac_keydata, SHA512_HMAC_KEYLEN));
VERIFY0(nvlist_add_uint8_array(nvl, DSL_CRYPTO_KEY_IV, iv,
WRAPPING_IV_LEN));
VERIFY0(nvlist_add_uint8_array(nvl, DSL_CRYPTO_KEY_MAC, mac,
WRAPPING_MAC_LEN));
VERIFY0(nvlist_add_uint8_array(nvl, "portable_mac",
os->os_phys->os_portable_mac, ZIO_OBJSET_MAC_LEN));
fnvlist_add_uint64(nvl, zfs_prop_to_name(ZFS_PROP_KEYFORMAT), format);
fnvlist_add_uint64(nvl, zfs_prop_to_name(ZFS_PROP_PBKDF2_ITERS), iters);
fnvlist_add_uint64(nvl, zfs_prop_to_name(ZFS_PROP_PBKDF2_SALT), salt);
fnvlist_add_uint64(nvl, "mdn_checksum", mdn->dn_checksum);
fnvlist_add_uint64(nvl, "mdn_compress", mdn->dn_compress);
fnvlist_add_uint64(nvl, "mdn_nlevels", mdn->dn_nlevels);
fnvlist_add_uint64(nvl, "mdn_blksz", mdn->dn_datablksz);
fnvlist_add_uint64(nvl, "mdn_indblkshift", mdn->dn_indblkshift);
fnvlist_add_uint64(nvl, "mdn_nblkptr", mdn->dn_nblkptr);
fnvlist_add_uint64(nvl, "mdn_maxblkid", mdn->dn_maxblkid);
*nvl_out = nvl;
return (0);
error_unlock:
dsl_pool_config_exit(dp, FTAG);
error:
if (rdd != NULL)
dsl_dir_rele(rdd, FTAG);
nvlist_free(nvl);
*nvl_out = NULL;
return (ret);
}
uint64_t
dsl_crypto_key_create_sync(uint64_t crypt, dsl_wrapping_key_t *wkey,
dmu_tx_t *tx)
{
dsl_crypto_key_t dck;
uint64_t version = ZIO_CRYPT_KEY_CURRENT_VERSION;
uint64_t one = 1ULL;
ASSERT(dmu_tx_is_syncing(tx));
ASSERT3U(crypt, <, ZIO_CRYPT_FUNCTIONS);
ASSERT3U(crypt, >, ZIO_CRYPT_OFF);
/* create the DSL Crypto Key ZAP object */
dck.dck_obj = zap_create(tx->tx_pool->dp_meta_objset,
DMU_OTN_ZAP_METADATA, DMU_OT_NONE, 0, tx);
/* fill in the key (on the stack) and sync it to disk */
dck.dck_wkey = wkey;
VERIFY0(zio_crypt_key_init(crypt, &dck.dck_key));
dsl_crypto_key_sync(&dck, tx);
VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, dck.dck_obj,
DSL_CRYPTO_KEY_REFCOUNT, sizeof (uint64_t), 1, &one, tx));
VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, dck.dck_obj,
DSL_CRYPTO_KEY_VERSION, sizeof (uint64_t), 1, &version, tx));
zio_crypt_key_destroy(&dck.dck_key);
bzero(&dck.dck_key, sizeof (zio_crypt_key_t));
return (dck.dck_obj);
}
uint64_t
dsl_crypto_key_clone_sync(dsl_dir_t *origindd, dmu_tx_t *tx)
{
objset_t *mos = tx->tx_pool->dp_meta_objset;
ASSERT(dmu_tx_is_syncing(tx));
VERIFY0(zap_increment(mos, origindd->dd_crypto_obj,
DSL_CRYPTO_KEY_REFCOUNT, 1, tx));
return (origindd->dd_crypto_obj);
}
void
dsl_crypto_key_destroy_sync(uint64_t dckobj, dmu_tx_t *tx)
{
objset_t *mos = tx->tx_pool->dp_meta_objset;
uint64_t refcnt;
/* Decrement the refcount, destroy if this is the last reference */
VERIFY0(zap_lookup(mos, dckobj, DSL_CRYPTO_KEY_REFCOUNT,
sizeof (uint64_t), 1, &refcnt));
if (refcnt != 1) {
VERIFY0(zap_increment(mos, dckobj, DSL_CRYPTO_KEY_REFCOUNT,
-1, tx));
} else {
VERIFY0(zap_destroy(mos, dckobj, tx));
}
}
void
dsl_dataset_crypt_stats(dsl_dataset_t *ds, nvlist_t *nv)
{
uint64_t intval;
dsl_dir_t *dd = ds->ds_dir;
dsl_dir_t *enc_root;
char buf[ZFS_MAX_DATASET_NAME_LEN];
if (dd->dd_crypto_obj == 0)
return;
intval = dsl_dataset_get_keystatus(dd);
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_KEYSTATUS, intval);
if (dsl_dir_get_crypt(dd, &intval) == 0)
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_ENCRYPTION, intval);
if (zap_lookup(dd->dd_pool->dp_meta_objset, dd->dd_crypto_obj,
DSL_CRYPTO_KEY_GUID, 8, 1, &intval) == 0) {
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_KEY_GUID, intval);
}
if (zap_lookup(dd->dd_pool->dp_meta_objset, dd->dd_crypto_obj,
zfs_prop_to_name(ZFS_PROP_KEYFORMAT), 8, 1, &intval) == 0) {
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_KEYFORMAT, intval);
}
if (zap_lookup(dd->dd_pool->dp_meta_objset, dd->dd_crypto_obj,
zfs_prop_to_name(ZFS_PROP_PBKDF2_SALT), 8, 1, &intval) == 0) {
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_PBKDF2_SALT, intval);
}
if (zap_lookup(dd->dd_pool->dp_meta_objset, dd->dd_crypto_obj,
zfs_prop_to_name(ZFS_PROP_PBKDF2_ITERS), 8, 1, &intval) == 0) {
dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_PBKDF2_ITERS, intval);
}
if (dsl_dir_get_encryption_root_ddobj(dd, &intval) == 0) {
VERIFY0(dsl_dir_hold_obj(dd->dd_pool, intval, NULL, FTAG,
&enc_root));
dsl_dir_name(enc_root, buf);
dsl_dir_rele(enc_root, FTAG);
dsl_prop_nvlist_add_string(nv, ZFS_PROP_ENCRYPTION_ROOT, buf);
}
}
int
spa_crypt_get_salt(spa_t *spa, uint64_t dsobj, uint8_t *salt)
{
int ret;
dsl_crypto_key_t *dck = NULL;
/* look up the key from the spa's keystore */
ret = spa_keystore_lookup_key(spa, dsobj, FTAG, &dck);
if (ret != 0)
goto error;
ret = zio_crypt_key_get_salt(&dck->dck_key, salt);
if (ret != 0)
goto error;
spa_keystore_dsl_key_rele(spa, dck, FTAG);
return (0);
error:
if (dck != NULL)
spa_keystore_dsl_key_rele(spa, dck, FTAG);
return (ret);
}
/*
* Objset blocks are a special case for MAC generation. These blocks have 2
* 256-bit MACs which are embedded within the block itself, rather than a
* single 128 bit MAC. As a result, this function handles encoding and decoding
* the MACs on its own, unlike other functions in this file.
*/
int
spa_do_crypt_objset_mac_abd(boolean_t generate, spa_t *spa, uint64_t dsobj,
abd_t *abd, uint_t datalen, boolean_t byteswap)
{
int ret;
dsl_crypto_key_t *dck = NULL;
void *buf = abd_borrow_buf_copy(abd, datalen);
objset_phys_t *osp = buf;
uint8_t portable_mac[ZIO_OBJSET_MAC_LEN];
uint8_t local_mac[ZIO_OBJSET_MAC_LEN];
/* look up the key from the spa's keystore */
ret = spa_keystore_lookup_key(spa, dsobj, FTAG, &dck);
if (ret != 0)
goto error;
/* calculate both HMACs */
ret = zio_crypt_do_objset_hmacs(&dck->dck_key, buf, datalen,
byteswap, portable_mac, local_mac);
if (ret != 0)
goto error;
spa_keystore_dsl_key_rele(spa, dck, FTAG);
/* if we are generating encode the HMACs in the objset_phys_t */
if (generate) {
bcopy(portable_mac, osp->os_portable_mac, ZIO_OBJSET_MAC_LEN);
bcopy(local_mac, osp->os_local_mac, ZIO_OBJSET_MAC_LEN);
abd_return_buf_copy(abd, buf, datalen);
return (0);
}
if (bcmp(portable_mac, osp->os_portable_mac, ZIO_OBJSET_MAC_LEN) != 0 ||
bcmp(local_mac, osp->os_local_mac, ZIO_OBJSET_MAC_LEN) != 0) {
abd_return_buf(abd, buf, datalen);
return (SET_ERROR(ECKSUM));
}
abd_return_buf(abd, buf, datalen);
return (0);
error:
if (dck != NULL)
spa_keystore_dsl_key_rele(spa, dck, FTAG);
abd_return_buf(abd, buf, datalen);
return (ret);
}
int
spa_do_crypt_mac_abd(boolean_t generate, spa_t *spa, uint64_t dsobj, abd_t *abd,
uint_t datalen, uint8_t *mac)
{
int ret;
dsl_crypto_key_t *dck = NULL;
uint8_t *buf = abd_borrow_buf_copy(abd, datalen);
uint8_t digestbuf[ZIO_DATA_MAC_LEN];
/* look up the key from the spa's keystore */
ret = spa_keystore_lookup_key(spa, dsobj, FTAG, &dck);
if (ret != 0)
goto error;
/* perform the hmac */
ret = zio_crypt_do_hmac(&dck->dck_key, buf, datalen,
digestbuf, ZIO_DATA_MAC_LEN);
if (ret != 0)
goto error;
abd_return_buf(abd, buf, datalen);
spa_keystore_dsl_key_rele(spa, dck, FTAG);
/*
* Truncate and fill in mac buffer if we were asked to generate a MAC.
* Otherwise verify that the MAC matched what we expected.
*/
if (generate) {
bcopy(digestbuf, mac, ZIO_DATA_MAC_LEN);
return (0);
}
if (bcmp(digestbuf, mac, ZIO_DATA_MAC_LEN) != 0)
return (SET_ERROR(ECKSUM));
return (0);
error:
if (dck != NULL)
spa_keystore_dsl_key_rele(spa, dck, FTAG);
abd_return_buf(abd, buf, datalen);
return (ret);
}
/*
* This function serves as a multiplexer for encryption and decryption of
* all blocks (except the L2ARC). For encryption, it will populate the IV,
* salt, MAC, and cabd (the ciphertext). On decryption it will simply use
* these fields to populate pabd (the plaintext).
*/
int
spa_do_crypt_abd(boolean_t encrypt, spa_t *spa, uint64_t dsobj,
const blkptr_t *bp, uint64_t txgid, uint_t datalen, abd_t *pabd,
abd_t *cabd, uint8_t *iv, uint8_t *mac, uint8_t *salt, boolean_t *no_crypt)
{
int ret;
dmu_object_type_t ot = BP_GET_TYPE(bp);
dsl_crypto_key_t *dck = NULL;
uint8_t *plainbuf = NULL, *cipherbuf = NULL;
ASSERT(spa_feature_is_active(spa, SPA_FEATURE_ENCRYPTION));
ASSERT(!BP_IS_EMBEDDED(bp));
ASSERT(BP_IS_ENCRYPTED(bp));
/* look up the key from the spa's keystore */
ret = spa_keystore_lookup_key(spa, dsobj, FTAG, &dck);
if (ret != 0)
return (ret);
if (encrypt) {
plainbuf = abd_borrow_buf_copy(pabd, datalen);
cipherbuf = abd_borrow_buf(cabd, datalen);
} else {
plainbuf = abd_borrow_buf(pabd, datalen);
cipherbuf = abd_borrow_buf_copy(cabd, datalen);
}
/*
* Both encryption and decryption functions need a salt for key
* generation and an IV. When encrypting a non-dedup block, we
* generate the salt and IV randomly to be stored by the caller. Dedup
* blocks perform a (more expensive) HMAC of the plaintext to obtain
* the salt and the IV. ZIL blocks have their salt and IV generated
* at allocation time in zio_alloc_zil(). On decryption, we simply use
* the provided values.
*/
if (encrypt && ot != DMU_OT_INTENT_LOG && !BP_GET_DEDUP(bp)) {
ret = zio_crypt_key_get_salt(&dck->dck_key, salt);
if (ret != 0)
goto error;
ret = zio_crypt_generate_iv(iv);
if (ret != 0)
goto error;
} else if (encrypt && BP_GET_DEDUP(bp)) {
ret = zio_crypt_generate_iv_salt_dedup(&dck->dck_key,
plainbuf, datalen, iv, salt);
if (ret != 0)
goto error;
}
/* call lower level function to perform encryption / decryption */
ret = zio_do_crypt_data(encrypt, &dck->dck_key, salt, ot, iv, mac,
datalen, BP_SHOULD_BYTESWAP(bp), plainbuf, cipherbuf, no_crypt);
if (ret != 0)
goto error;
if (encrypt) {
abd_return_buf(pabd, plainbuf, datalen);
abd_return_buf_copy(cabd, cipherbuf, datalen);
} else {
abd_return_buf_copy(pabd, plainbuf, datalen);
abd_return_buf(cabd, cipherbuf, datalen);
}
spa_keystore_dsl_key_rele(spa, dck, FTAG);
return (0);
error:
if (encrypt) {
/* zero out any state we might have changed while encrypting */
bzero(salt, ZIO_DATA_SALT_LEN);
bzero(iv, ZIO_DATA_IV_LEN);
bzero(mac, ZIO_DATA_MAC_LEN);
abd_return_buf(pabd, plainbuf, datalen);
abd_return_buf_copy(cabd, cipherbuf, datalen);
} else {
abd_return_buf_copy(pabd, plainbuf, datalen);
abd_return_buf(cabd, cipherbuf, datalen);
}
spa_keystore_dsl_key_rele(spa, dck, FTAG);
return (ret);
}
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