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/zfs_refcount.h>
  25 #if defined(__FreeBSD__) && defined(_KERNEL)
  26 #include <sys/freebsd_crypto.h>
  27 #else
  28 #include <sys/crypto/api.h>
  29 #endif /* __FreeBSD__ */
  30 #include <sys/nvpair.h>
  31 #include <sys/avl.h>
  32 #include <sys/zio.h>
  33
  34 /* forward declarations */
  35 struct zbookmark_phys;
  36
  37 #define WRAPPING_KEY_LEN        32
  38 #define WRAPPING_IV_LEN         ZIO_DATA_IV_LEN
  39 #define WRAPPING_MAC_LEN        ZIO_DATA_MAC_LEN
  40 #define MASTER_KEY_MAX_LEN      32
  41 #define SHA512_HMAC_KEYLEN      64
  42
  43 #define ZIO_CRYPT_KEY_CURRENT_VERSION   1ULL
  44
  45 typedef enum zio_crypt_type {
  46         ZC_TYPE_NONE = 0,
  47         ZC_TYPE_CCM,
  48         ZC_TYPE_GCM
  49 } zio_crypt_type_t;
  50
  51 /* table of supported crypto algorithms, modes and keylengths. */
  52 typedef struct zio_crypt_info {
  53         /* mechanism name, needed by ICP */
  54 #if defined(__FreeBSD__) && defined(_KERNEL)
  55         /*
  56          * I've deliberately used a different name here, to catch
  57          * ICP-using code.
  58          */
  59         const char      *ci_algname;
  60 #else
  61         crypto_mech_name_t ci_mechname;
  62 #endif
  63         /* cipher mode type (GCM, CCM) */
  64         zio_crypt_type_t ci_crypt_type;
  65
  66         /* length of the encryption key */
  67         size_t ci_keylen;
  68
  69         /* human-readable name of the encryption algorithm */
  70         char *ci_name;
  71 } zio_crypt_info_t;
  72
  73 extern zio_crypt_info_t zio_crypt_table[ZIO_CRYPT_FUNCTIONS];
  74
  75 /* in memory representation of an unwrapped key that is loaded into memory */
  76 typedef struct zio_crypt_key {
  77         /* encryption algorithm */
  78         uint64_t zk_crypt;
  79
  80         /* on-disk format version */
  81         uint64_t zk_version;
  82
  83         /* GUID for uniquely identifying this key. Not encrypted on disk. */
  84         uint64_t zk_guid;
  85
  86         /* buffer for master key */
  87         uint8_t zk_master_keydata[MASTER_KEY_MAX_LEN];
  88
  89         /* buffer for hmac key */
  90         uint8_t zk_hmac_keydata[SHA512_HMAC_KEYLEN];
  91
  92         /* buffer for current encryption key derived from master key */
  93         uint8_t zk_current_keydata[MASTER_KEY_MAX_LEN];
  94
  95         /* current 64 bit salt for deriving an encryption key */
  96         uint8_t zk_salt[ZIO_DATA_SALT_LEN];
  97
  98         /* count of how many times the current salt has been used */
  99         uint64_t zk_salt_count;
 100
 101         /* illumos crypto api current encryption key */
 102         crypto_key_t zk_current_key;
 103
 104 #if defined(__FreeBSD__) && defined(_KERNEL)
 105         /* Session for current encryption key.  Must always be set */
 106         freebsd_crypt_session_t zk_session;
 107 #else
 108         /* template of current encryption key for illumos crypto api */
 109         crypto_ctx_template_t zk_current_tmpl;
 110 #endif
 111
 112         /* illumos crypto api current hmac key */
 113         crypto_key_t zk_hmac_key;
 114
 115         /* template of hmac key for illumos crypto api */
 116         crypto_ctx_template_t zk_hmac_tmpl;
 117
 118         /* lock for changing the salt and dependent values */
 119         krwlock_t zk_salt_lock;
 120 } zio_crypt_key_t;
 121
 122 void zio_crypt_key_destroy(zio_crypt_key_t *key);
 123 int zio_crypt_key_init(uint64_t crypt, zio_crypt_key_t *key);
 124 int zio_crypt_key_get_salt(zio_crypt_key_t *key, uint8_t *salt_out);
 125
 126 int zio_crypt_key_wrap(crypto_key_t *cwkey, zio_crypt_key_t *key, uint8_t *iv,
 127     uint8_t *mac, uint8_t *keydata_out, uint8_t *hmac_keydata_out);
 128 int zio_crypt_key_unwrap(crypto_key_t *cwkey, uint64_t crypt, uint64_t version,
 129     uint64_t guid, uint8_t *keydata, uint8_t *hmac_keydata, uint8_t *iv,
 130     uint8_t *mac, zio_crypt_key_t *key);
 131 int zio_crypt_generate_iv(uint8_t *ivbuf);
 132 int zio_crypt_generate_iv_salt_dedup(zio_crypt_key_t *key, uint8_t *data,
 133     uint_t datalen, uint8_t *ivbuf, uint8_t *salt);
 134
 135 void zio_crypt_encode_params_bp(blkptr_t *bp, uint8_t *salt, uint8_t *iv);
 136 void zio_crypt_decode_params_bp(const blkptr_t *bp, uint8_t *salt, uint8_t *iv);
 137 void zio_crypt_encode_mac_bp(blkptr_t *bp, uint8_t *mac);
 138 void zio_crypt_decode_mac_bp(const blkptr_t *bp, uint8_t *mac);
 139 void zio_crypt_encode_mac_zil(void *data, uint8_t *mac);
 140 void zio_crypt_decode_mac_zil(const void *data, uint8_t *mac);
 141 void zio_crypt_copy_dnode_bonus(abd_t *src_abd, uint8_t *dst, uint_t datalen);
 142
 143 int zio_crypt_do_indirect_mac_checksum(boolean_t generate, void *buf,
 144     uint_t datalen, boolean_t byteswap, uint8_t *cksum);
 145 int zio_crypt_do_indirect_mac_checksum_abd(boolean_t generate, abd_t *abd,
 146     uint_t datalen, boolean_t byteswap, uint8_t *cksum);
 147 int zio_crypt_do_hmac(zio_crypt_key_t *key, uint8_t *data, uint_t datalen,
 148     uint8_t *digestbuf, uint_t digestlen);
 149 int zio_crypt_do_objset_hmacs(zio_crypt_key_t *key, void *data, uint_t datalen,
 150     boolean_t byteswap, uint8_t *portable_mac, uint8_t *local_mac);
 151 int zio_do_crypt_data(boolean_t encrypt, zio_crypt_key_t *key,
 152     dmu_object_type_t ot, boolean_t byteswap, uint8_t *salt, uint8_t *iv,
 153     uint8_t *mac, uint_t datalen, uint8_t *plainbuf, uint8_t *cipherbuf,
 154     boolean_t *no_crypt);
 155 int zio_do_crypt_abd(boolean_t encrypt, zio_crypt_key_t *key,
 156     dmu_object_type_t ot, boolean_t byteswap, uint8_t *salt, uint8_t *iv,
 157     uint8_t *mac, uint_t datalen, abd_t *pabd, abd_t *cabd,
 158     boolean_t *no_crypt);
 159
 160 #endif