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