145 lines
4.8 KiB
C
145 lines
4.8 KiB
C
/*
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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_ZIO_CRYPT_H
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#define _SYS_ZIO_CRYPT_H
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#include <sys/dmu.h>
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#include <sys/refcount.h>
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#include <sys/crypto/api.h>
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#include <sys/nvpair.h>
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#include <sys/avl.h>
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#include <sys/zio.h>
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/* forward declarations */
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struct zbookmark_phys;
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#define WRAPPING_KEY_LEN 32
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#define WRAPPING_IV_LEN ZIO_DATA_IV_LEN
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#define WRAPPING_MAC_LEN ZIO_DATA_MAC_LEN
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#define MASTER_KEY_MAX_LEN 32
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#define SHA512_HMAC_KEYLEN 64
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#define ZIO_CRYPT_KEY_CURRENT_VERSION 1ULL
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typedef enum zio_crypt_type {
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ZC_TYPE_NONE = 0,
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ZC_TYPE_CCM,
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ZC_TYPE_GCM
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} zio_crypt_type_t;
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/* table of supported crypto algorithms, modes and keylengths. */
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typedef struct zio_crypt_info {
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/* mechanism name, needed by ICP */
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crypto_mech_name_t ci_mechname;
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/* cipher mode type (GCM, CCM) */
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zio_crypt_type_t ci_crypt_type;
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/* length of the encryption key */
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size_t ci_keylen;
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/* human-readable name of the encryption alforithm */
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char *ci_name;
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} zio_crypt_info_t;
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extern zio_crypt_info_t zio_crypt_table[ZIO_CRYPT_FUNCTIONS];
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/* in memory representation of an unwrapped key that is loaded into memory */
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typedef struct zio_crypt_key {
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/* encryption algorithm */
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uint64_t zk_crypt;
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/* on-disk format version */
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uint64_t zk_version;
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/* GUID for uniquely identifying this key. Not encrypted on disk. */
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uint64_t zk_guid;
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/* buffer for master key */
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uint8_t zk_master_keydata[MASTER_KEY_MAX_LEN];
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/* buffer for hmac key */
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uint8_t zk_hmac_keydata[SHA512_HMAC_KEYLEN];
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/* buffer for currrent encryption key derived from master key */
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uint8_t zk_current_keydata[MASTER_KEY_MAX_LEN];
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/* current 64 bit salt for deriving an encryption key */
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uint8_t zk_salt[ZIO_DATA_SALT_LEN];
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/* count of how many times the current salt has been used */
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uint64_t zk_salt_count;
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/* illumos crypto api current encryption key */
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crypto_key_t zk_current_key;
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/* template of current encryption key for illumos crypto api */
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crypto_ctx_template_t zk_current_tmpl;
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/* illumos crypto api current hmac key */
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crypto_key_t zk_hmac_key;
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/* template of hmac key for illumos crypto api */
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crypto_ctx_template_t zk_hmac_tmpl;
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/* lock for changing the salt and dependant values */
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krwlock_t zk_salt_lock;
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} zio_crypt_key_t;
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void zio_crypt_key_destroy(zio_crypt_key_t *key);
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int zio_crypt_key_init(uint64_t crypt, zio_crypt_key_t *key);
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int zio_crypt_key_get_salt(zio_crypt_key_t *key, uint8_t *salt_out);
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int zio_crypt_key_wrap(crypto_key_t *cwkey, zio_crypt_key_t *key, uint8_t *iv,
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uint8_t *mac, uint8_t *keydata_out, uint8_t *hmac_keydata_out);
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int zio_crypt_key_unwrap(crypto_key_t *cwkey, uint64_t crypt, uint64_t version,
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uint64_t guid, uint8_t *keydata, uint8_t *hmac_keydata, uint8_t *iv,
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uint8_t *mac, zio_crypt_key_t *key);
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int zio_crypt_generate_iv(uint8_t *ivbuf);
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int zio_crypt_generate_iv_salt_dedup(zio_crypt_key_t *key, uint8_t *data,
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uint_t datalen, uint8_t *ivbuf, uint8_t *salt);
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void zio_crypt_encode_params_bp(blkptr_t *bp, uint8_t *salt, uint8_t *iv);
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void zio_crypt_decode_params_bp(const blkptr_t *bp, uint8_t *salt, uint8_t *iv);
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void zio_crypt_encode_mac_bp(blkptr_t *bp, uint8_t *mac);
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void zio_crypt_decode_mac_bp(const blkptr_t *bp, uint8_t *mac);
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void zio_crypt_encode_mac_zil(void *data, uint8_t *mac);
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void zio_crypt_decode_mac_zil(const void *data, uint8_t *mac);
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void zio_crypt_copy_dnode_bonus(abd_t *src_abd, uint8_t *dst, uint_t datalen);
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int zio_crypt_do_indirect_mac_checksum(boolean_t generate, void *buf,
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uint_t datalen, boolean_t byteswap, uint8_t *cksum);
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int zio_crypt_do_indirect_mac_checksum_abd(boolean_t generate, abd_t *abd,
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uint_t datalen, boolean_t byteswap, uint8_t *cksum);
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int zio_crypt_do_hmac(zio_crypt_key_t *key, uint8_t *data, uint_t datalen,
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uint8_t *digestbuf, uint_t digestlen);
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int zio_crypt_do_objset_hmacs(zio_crypt_key_t *key, void *data, uint_t datalen,
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boolean_t byteswap, uint8_t *portable_mac, uint8_t *local_mac);
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int zio_do_crypt_data(boolean_t encrypt, zio_crypt_key_t *key,
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dmu_object_type_t ot, boolean_t byteswap, uint8_t *salt, uint8_t *iv,
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uint8_t *mac, uint_t datalen, uint8_t *plainbuf, uint8_t *cipherbuf,
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boolean_t *no_crypt);
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int zio_do_crypt_abd(boolean_t encrypt, zio_crypt_key_t *key,
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dmu_object_type_t ot, boolean_t byteswap, uint8_t *salt, uint8_t *iv,
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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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