include/sys/zio_crypt.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * This file and its contents are supplied under the terms of the
   5  * Common Development and Distribution License ("CDDL"), version 1.0.
   6  * You may only use this file in accordance with the terms of version
   7  * 1.0 of the CDDL.
   8  *
   9  * A full copy of the text of the CDDL should have accompanied this
  10  * source.  A copy of the CDDL is also available via the Internet at
  11  * http://www.illumos.org/license/CDDL.
  12  *
  13  * CDDL HEADER END
  14  */
  15
  16 /*
  17  * Copyright (c) 2017, Datto, Inc. All rights reserved.
  18  */
  19
  20 #ifndef _SYS_ZIO_CRYPT_H
  21 #define _SYS_ZIO_CRYPT_H
  22
  23 #include <sys/dmu.h>
  24 #include <sys/refcount.h>
  25 #include <sys/crypto/api.h>
  26 #include <sys/nvpair.h>
  27 #include <sys/avl.h>
  28 #include <sys/zio.h>
  29
  30 /* forward declarations */
  31 struct zbookmark_phys;
  32
  33 #define WRAPPING_KEY_LEN        32
  34 #define WRAPPING_IV_LEN         ZIO_DATA_IV_LEN
  35 #define WRAPPING_MAC_LEN        ZIO_DATA_MAC_LEN
  36 #define MASTER_KEY_MAX_LEN      32
  37 #define SHA512_HMAC_KEYLEN      64
  38
  39 typedef enum zio_crypt_type {
  40         ZC_TYPE_NONE = 0,
  41         ZC_TYPE_CCM,
  42         ZC_TYPE_GCM
  43 } zio_crypt_type_t;
  44
  45 /* table of supported crypto algorithms, modes and keylengths. */
  46 typedef struct zio_crypt_info {
  47         /* mechanism name, needed by ICP */
  48         crypto_mech_name_t ci_mechname;
  49
  50         /* cipher mode type (GCM, CCM) */
  51         zio_crypt_type_t ci_crypt_type;
  52
  53         /* length of the encryption key */
  54         size_t ci_keylen;
  55
  56         /* human-readable name of the encryption alforithm */
  57         char *ci_name;
  58 } zio_crypt_info_t;
  59
  60 extern zio_crypt_info_t zio_crypt_table[ZIO_CRYPT_FUNCTIONS];
  61
  62 /* in memory representation of an unwrapped key that is loaded into memory */
  63 typedef struct zio_crypt_key {
  64         /* encryption algorithm */
  65         uint64_t zk_crypt;
  66
  67         /* GUID for uniquely identifying this key. Not encrypted on disk. */
  68         uint64_t zk_guid;
  69
  70         /* buffer for master key */
  71         uint8_t zk_master_keydata[MASTER_KEY_MAX_LEN];
  72
  73         /* buffer for hmac key */
  74         uint8_t zk_hmac_keydata[SHA512_HMAC_KEYLEN];
  75
  76         /* buffer for currrent encryption key derived from master key */
  77         uint8_t zk_current_keydata[MASTER_KEY_MAX_LEN];
  78
  79         /* current 64 bit salt for deriving an encryption key */
  80         uint8_t zk_salt[ZIO_DATA_SALT_LEN];
  81
  82         /* count of how many times the current salt has been used */
  83         uint64_t zk_salt_count;
  84
  85         /* illumos crypto api current encryption key */
  86         crypto_key_t zk_current_key;
  87
  88         /* template of current encryption key for illumos crypto api */
  89         crypto_ctx_template_t zk_current_tmpl;
  90
  91         /* illumos crypto api current hmac key */
  92         crypto_key_t zk_hmac_key;
  93
  94         /* template of hmac key for illumos crypto api */
  95         crypto_ctx_template_t zk_hmac_tmpl;
  96
  97         /* lock for changing the salt and dependant values */
  98         krwlock_t zk_salt_lock;
  99 } zio_crypt_key_t;
 100
 101 void zio_crypt_key_destroy(zio_crypt_key_t *key);
 102 int zio_crypt_key_init(uint64_t crypt, zio_crypt_key_t *key);
 103 int zio_crypt_key_get_salt(zio_crypt_key_t *key, uint8_t *salt_out);
 104
 105 int zio_crypt_key_wrap(crypto_key_t *cwkey, zio_crypt_key_t *key, uint8_t *iv,
 106     uint8_t *mac, uint8_t *keydata_out, uint8_t *hmac_keydata_out);
 107 int zio_crypt_key_unwrap(crypto_key_t *cwkey, uint64_t crypt, uint64_t guid,
 108     uint8_t *keydata, uint8_t *hmac_keydata, uint8_t *iv, uint8_t *mac,
 109     zio_crypt_key_t *key);
 110 int zio_crypt_generate_iv(uint8_t *ivbuf);
 111 int zio_crypt_generate_iv_salt_dedup(zio_crypt_key_t *key, uint8_t *data,
 112     uint_t datalen, uint8_t *ivbuf, uint8_t *salt);
 113
 114 void zio_crypt_encode_params_bp(blkptr_t *bp, uint8_t *salt, uint8_t *iv);
 115 void zio_crypt_decode_params_bp(const blkptr_t *bp, uint8_t *salt, uint8_t *iv);
 116 void zio_crypt_encode_mac_bp(blkptr_t *bp, uint8_t *mac);
 117 void zio_crypt_decode_mac_bp(const blkptr_t *bp, uint8_t *mac);
 118 void zio_crypt_encode_mac_zil(void *data, uint8_t *mac);
 119 void zio_crypt_decode_mac_zil(const void *data, uint8_t *mac);
 120 void zio_crypt_copy_dnode_bonus(abd_t *src_abd, uint8_t *dst, uint_t datalen);
 121
 122 int zio_crypt_do_indirect_mac_checksum(boolean_t generate, void *buf,
 123     uint_t datalen, boolean_t byteswap, uint8_t *cksum);
 124 int zio_crypt_do_indirect_mac_checksum_abd(boolean_t generate, abd_t *abd,
 125     uint_t datalen, boolean_t byteswap, uint8_t *cksum);
 126 int zio_crypt_do_hmac(zio_crypt_key_t *key, uint8_t *data, uint_t datalen,
 127     uint8_t *digestbuf, uint_t digestlen);
 128 int zio_crypt_do_objset_hmacs(zio_crypt_key_t *key, void *data, uint_t datalen,
 129     boolean_t byteswap, uint8_t *portable_mac, uint8_t *local_mac);
 130 int zio_do_crypt_data(boolean_t encrypt, zio_crypt_key_t *key, uint8_t *salt,
 131     dmu_object_type_t ot, uint8_t *iv, uint8_t *mac, uint_t datalen,
 132     boolean_t byteswap, uint8_t *plainbuf, uint8_t *cipherbuf,
 133     boolean_t *no_crypt);
 134 int zio_do_crypt_abd(boolean_t encrypt, zio_crypt_key_t *key, uint8_t *salt,
 135     dmu_object_type_t ot, uint8_t *iv, uint8_t *mac, uint_t datalen,
 136     boolean_t byteswap, abd_t *pabd, abd_t *cabd, boolean_t *no_crypt);
 137
 138 #endif