226 lines
7.8 KiB
C
226 lines
7.8 KiB
C
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/*
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* CDDL HEADER START
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*
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* This file and its contents are supplied under the terms of the
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* Common Development and Distribution License ("CDDL"), version 1.0.
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* You may only use this file in accordance with the terms of version
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* 1.0 of the CDDL.
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*
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* A full copy of the text of the CDDL should have accompanied this
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* source. A copy of the CDDL is also available via the Internet at
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* http://www.illumos.org/license/CDDL.
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2017, Datto, Inc. All rights reserved.
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*/
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#ifndef _SYS_DSL_CRYPT_H
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#define _SYS_DSL_CRYPT_H
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#include <sys/dmu_tx.h>
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#include <sys/dmu.h>
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#include <sys/zio_crypt.h>
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#include <sys/spa.h>
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#include <sys/dsl_dataset.h>
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/*
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* ZAP entry keys for DSL Crypto Keys stored on disk. In addition,
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* ZFS_PROP_KEYFORMAT, ZFS_PROP_PBKDF2_SALT, and ZFS_PROP_PBKDF2_ITERS are
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* also maintained here using their respective property names.
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*/
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#define DSL_CRYPTO_KEY_CRYPTO_SUITE "DSL_CRYPTO_SUITE"
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#define DSL_CRYPTO_KEY_GUID "DSL_CRYPTO_GUID"
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#define DSL_CRYPTO_KEY_IV "DSL_CRYPTO_IV"
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#define DSL_CRYPTO_KEY_MAC "DSL_CRYPTO_MAC"
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#define DSL_CRYPTO_KEY_MASTER_KEY "DSL_CRYPTO_MASTER_KEY_1"
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#define DSL_CRYPTO_KEY_HMAC_KEY "DSL_CRYPTO_HMAC_KEY_1"
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#define DSL_CRYPTO_KEY_ROOT_DDOBJ "DSL_CRYPTO_ROOT_DDOBJ"
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#define DSL_CRYPTO_KEY_REFCOUNT "DSL_CRYPTO_REFCOUNT"
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#define DSL_CRYPTO_KEY_VERSION "DSL_CRYPTO_VERSION"
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/*
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* In-memory representation of a wrapping key. One of these structs will exist
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* for each encryption root with its key loaded.
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*/
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typedef struct dsl_wrapping_key {
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/* link on spa_keystore_t:sk_wkeys */
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avl_node_t wk_avl_link;
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/* keyformat property enum */
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zfs_keyformat_t wk_keyformat;
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/* the pbkdf2 salt, if the keyformat is of type passphrase */
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uint64_t wk_salt;
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/* the pbkdf2 iterations, if the keyformat is of type passphrase */
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uint64_t wk_iters;
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/* actual wrapping key */
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crypto_key_t wk_key;
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/* refcount of number of dsl_crypto_key_t's holding this struct */
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zfs_refcount_t wk_refcnt;
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/* dsl directory object that owns this wrapping key */
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uint64_t wk_ddobj;
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} dsl_wrapping_key_t;
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/* enum of commands indicating special actions that should be run */
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typedef enum dcp_cmd {
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/* key creation commands */
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DCP_CMD_NONE = 0, /* no specific command */
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DCP_CMD_RAW_RECV, /* raw receive */
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/* key changing commands */
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DCP_CMD_NEW_KEY, /* rewrap key as an encryption root */
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DCP_CMD_INHERIT, /* rewrap key with parent's wrapping key */
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DCP_CMD_FORCE_NEW_KEY, /* change to encryption root without rewrap */
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DCP_CMD_FORCE_INHERIT, /* inherit parent's key without rewrap */
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DCP_CMD_MAX
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} dcp_cmd_t;
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/*
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* This struct is a simple wrapper around all the parameters that are usually
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* required to setup encryption. It exists so that all of the params can be
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* passed around the kernel together for convenience.
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*/
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typedef struct dsl_crypto_params {
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/* command indicating intended action */
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dcp_cmd_t cp_cmd;
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/* the encryption algorithm */
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enum zio_encrypt cp_crypt;
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/* keylocation property string */
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char *cp_keylocation;
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/* the wrapping key */
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dsl_wrapping_key_t *cp_wkey;
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} dsl_crypto_params_t;
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/*
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* In-memory representation of a DSL Crypto Key object. One of these structs
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* (and corresponding on-disk ZAP object) will exist for each encrypted
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* clone family that is mounted or otherwise reading protected data.
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*/
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typedef struct dsl_crypto_key {
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/* link on spa_keystore_t:sk_dsl_keys */
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avl_node_t dck_avl_link;
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/* refcount of holders of this key */
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zfs_refcount_t dck_holds;
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/* master key used to derive encryption keys */
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zio_crypt_key_t dck_key;
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/* wrapping key for syncing this structure to disk */
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dsl_wrapping_key_t *dck_wkey;
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/* on-disk object id */
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uint64_t dck_obj;
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} dsl_crypto_key_t;
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/*
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* In-memory mapping of a dataset object id to a DSL Crypto Key. This is used
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* to look up the corresponding dsl_crypto_key_t from the zio layer for
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* performing data encryption and decryption.
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*/
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typedef struct dsl_key_mapping {
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/* link on spa_keystore_t:sk_key_mappings */
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avl_node_t km_avl_link;
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/* refcount of how many users are depending on this mapping */
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zfs_refcount_t km_refcnt;
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/* dataset this crypto key belongs to (index) */
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uint64_t km_dsobj;
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/* crypto key (value) of this record */
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dsl_crypto_key_t *km_key;
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} dsl_key_mapping_t;
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/* in memory structure for holding all wrapping and dsl keys */
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typedef struct spa_keystore {
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/* lock for protecting sk_dsl_keys */
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krwlock_t sk_dk_lock;
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/* tree of all dsl_crypto_key_t's */
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avl_tree_t sk_dsl_keys;
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/* lock for protecting sk_key_mappings */
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krwlock_t sk_km_lock;
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/* tree of all dsl_key_mapping_t's, indexed by dsobj */
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avl_tree_t sk_key_mappings;
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/* lock for protecting the wrapping keys tree */
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krwlock_t sk_wkeys_lock;
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/* tree of all dsl_wrapping_key_t's, indexed by ddobj */
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avl_tree_t sk_wkeys;
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} spa_keystore_t;
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int dsl_crypto_params_create_nvlist(dcp_cmd_t cmd, nvlist_t *props,
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nvlist_t *crypto_args, dsl_crypto_params_t **dcp_out);
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void dsl_crypto_params_free(dsl_crypto_params_t *dcp, boolean_t unload);
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void dsl_dataset_crypt_stats(struct dsl_dataset *ds, nvlist_t *nv);
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int dsl_crypto_can_set_keylocation(const char *dsname, const char *keylocation);
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boolean_t dsl_dir_incompatible_encryption_version(dsl_dir_t *dd);
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void spa_keystore_init(spa_keystore_t *sk);
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void spa_keystore_fini(spa_keystore_t *sk);
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void spa_keystore_dsl_key_rele(spa_t *spa, dsl_crypto_key_t *dck, void *tag);
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int spa_keystore_load_wkey_impl(spa_t *spa, dsl_wrapping_key_t *wkey);
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int spa_keystore_load_wkey(const char *dsname, dsl_crypto_params_t *dcp,
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boolean_t noop);
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int spa_keystore_unload_wkey_impl(spa_t *spa, uint64_t ddobj);
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int spa_keystore_unload_wkey(const char *dsname);
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int spa_keystore_create_mapping(spa_t *spa, struct dsl_dataset *ds, void *tag,
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dsl_key_mapping_t **km_out);
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int spa_keystore_remove_mapping(spa_t *spa, uint64_t dsobj, void *tag);
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void key_mapping_add_ref(dsl_key_mapping_t *km, void *tag);
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void key_mapping_rele(spa_t *spa, dsl_key_mapping_t *km, void *tag);
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int spa_keystore_lookup_key(spa_t *spa, uint64_t dsobj, void *tag,
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dsl_crypto_key_t **dck_out);
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int dsl_crypto_populate_key_nvlist(struct objset *os,
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uint64_t from_ivset_guid, nvlist_t **nvl_out);
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int dsl_crypto_recv_raw_key_check(struct dsl_dataset *ds,
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nvlist_t *nvl, dmu_tx_t *tx);
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void dsl_crypto_recv_raw_key_sync(struct dsl_dataset *ds,
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nvlist_t *nvl, dmu_tx_t *tx);
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int dsl_crypto_recv_raw(const char *poolname, uint64_t dsobj, uint64_t fromobj,
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dmu_objset_type_t ostype, nvlist_t *nvl, boolean_t do_key);
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int spa_keystore_change_key(const char *dsname, dsl_crypto_params_t *dcp);
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int dsl_dir_rename_crypt_check(dsl_dir_t *dd, dsl_dir_t *newparent);
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int dsl_dataset_promote_crypt_check(dsl_dir_t *target, dsl_dir_t *origin);
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void dsl_dataset_promote_crypt_sync(dsl_dir_t *target, dsl_dir_t *origin,
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dmu_tx_t *tx);
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int dmu_objset_create_crypt_check(dsl_dir_t *parentdd,
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dsl_crypto_params_t *dcp, boolean_t *will_encrypt);
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void dsl_dataset_create_crypt_sync(uint64_t dsobj, dsl_dir_t *dd,
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struct dsl_dataset *origin, dsl_crypto_params_t *dcp, dmu_tx_t *tx);
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uint64_t dsl_crypto_key_create_sync(uint64_t crypt, dsl_wrapping_key_t *wkey,
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dmu_tx_t *tx);
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uint64_t dsl_crypto_key_clone_sync(dsl_dir_t *origindd, dmu_tx_t *tx);
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void dsl_crypto_key_destroy_sync(uint64_t dckobj, dmu_tx_t *tx);
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int spa_crypt_get_salt(spa_t *spa, uint64_t dsobj, uint8_t *salt);
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int spa_do_crypt_mac_abd(boolean_t generate, spa_t *spa, uint64_t dsobj,
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abd_t *abd, uint_t datalen, uint8_t *mac);
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int spa_do_crypt_objset_mac_abd(boolean_t generate, spa_t *spa, uint64_t dsobj,
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abd_t *abd, uint_t datalen, boolean_t byteswap);
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int spa_do_crypt_abd(boolean_t encrypt, spa_t *spa, const zbookmark_phys_t *zb,
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dmu_object_type_t ot, boolean_t dedup, boolean_t bswap, uint8_t *salt,
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uint8_t *iv, uint8_t *mac, uint_t datalen, abd_t *pabd, abd_t *cabd,
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boolean_t *no_crypt);
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#endif
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