diff options
| -rw-r--r-- | crypto/block-luks.c | 169 |
1 files changed, 79 insertions, 90 deletions
diff --git a/crypto/block-luks.c b/crypto/block-luks.c index b759cc8d19..f3bfc921b2 100644 --- a/crypto/block-luks.c +++ b/crypto/block-luks.c @@ -199,13 +199,25 @@ QEMU_BUILD_BUG_ON(sizeof(struct QCryptoBlockLUKSHeader) != 592); struct QCryptoBlockLUKS { QCryptoBlockLUKSHeader header; - /* Cache parsed versions of what's in header fields, - * as we can't rely on QCryptoBlock.cipher being - * non-NULL */ + /* Main encryption algorithm used for encryption*/ QCryptoCipherAlgorithm cipher_alg; + + /* Mode of encryption for the selected encryption algorithm */ QCryptoCipherMode cipher_mode; + + /* Initialization vector generation algorithm */ QCryptoIVGenAlgorithm ivgen_alg; + + /* Hash algorithm used for IV generation*/ QCryptoHashAlgorithm ivgen_hash_alg; + + /* + * Encryption algorithm used for IV generation. + * Usually the same as main encryption algorithm + */ + QCryptoCipherAlgorithm ivgen_cipher_alg; + + /* Hash algorithm used in pbkdf2 function */ QCryptoHashAlgorithm hash_alg; }; @@ -412,12 +424,6 @@ static int qcrypto_block_luks_load_key(QCryptoBlock *block, size_t slot_idx, const char *password, - QCryptoCipherAlgorithm cipheralg, - QCryptoCipherMode ciphermode, - QCryptoHashAlgorithm hash, - QCryptoIVGenAlgorithm ivalg, - QCryptoCipherAlgorithm ivcipheralg, - QCryptoHashAlgorithm ivhash, uint8_t *masterkey, QCryptoBlockReadFunc readfunc, void *opaque, @@ -449,7 +455,7 @@ qcrypto_block_luks_load_key(QCryptoBlock *block, * the key is correct and validate the results of * decryption later. */ - if (qcrypto_pbkdf2(hash, + if (qcrypto_pbkdf2(luks->hash_alg, (const uint8_t *)password, strlen(password), slot->salt, QCRYPTO_BLOCK_LUKS_SALT_LEN, slot->iterations, @@ -477,19 +483,23 @@ qcrypto_block_luks_load_key(QCryptoBlock *block, /* Setup the cipher/ivgen that we'll use to try to decrypt * the split master key material */ - cipher = qcrypto_cipher_new(cipheralg, ciphermode, - possiblekey, luks->header.master_key_len, + cipher = qcrypto_cipher_new(luks->cipher_alg, + luks->cipher_mode, + possiblekey, + luks->header.master_key_len, errp); if (!cipher) { return -1; } - niv = qcrypto_cipher_get_iv_len(cipheralg, - ciphermode); - ivgen = qcrypto_ivgen_new(ivalg, - ivcipheralg, - ivhash, - possiblekey, luks->header.master_key_len, + niv = qcrypto_cipher_get_iv_len(luks->cipher_alg, + luks->cipher_mode); + + ivgen = qcrypto_ivgen_new(luks->ivgen_alg, + luks->ivgen_cipher_alg, + luks->ivgen_hash_alg, + possiblekey, + luks->header.master_key_len, errp); if (!ivgen) { return -1; @@ -518,7 +528,7 @@ qcrypto_block_luks_load_key(QCryptoBlock *block, * Now we've decrypted the split master key, join * it back together to get the actual master key. */ - if (qcrypto_afsplit_decode(hash, + if (qcrypto_afsplit_decode(luks->hash_alg, luks->header.master_key_len, slot->stripes, splitkey, @@ -536,7 +546,7 @@ qcrypto_block_luks_load_key(QCryptoBlock *block, * then comparing that to the hash stored in the key slot * header */ - if (qcrypto_pbkdf2(hash, + if (qcrypto_pbkdf2(luks->hash_alg, masterkey, luks->header.master_key_len, luks->header.master_key_salt, @@ -570,12 +580,6 @@ qcrypto_block_luks_load_key(QCryptoBlock *block, static int qcrypto_block_luks_find_key(QCryptoBlock *block, const char *password, - QCryptoCipherAlgorithm cipheralg, - QCryptoCipherMode ciphermode, - QCryptoHashAlgorithm hash, - QCryptoIVGenAlgorithm ivalg, - QCryptoCipherAlgorithm ivcipheralg, - QCryptoHashAlgorithm ivhash, uint8_t *masterkey, QCryptoBlockReadFunc readfunc, void *opaque, @@ -588,12 +592,6 @@ qcrypto_block_luks_find_key(QCryptoBlock *block, rv = qcrypto_block_luks_load_key(block, i, password, - cipheralg, - ciphermode, - hash, - ivalg, - ivcipheralg, - ivhash, masterkey, readfunc, opaque, @@ -607,7 +605,6 @@ qcrypto_block_luks_find_key(QCryptoBlock *block, } error_setg(errp, "Invalid password, cannot unlock any keyslot"); - error: return -1; } @@ -623,19 +620,13 @@ qcrypto_block_luks_open(QCryptoBlock *block, size_t n_threads, Error **errp) { - QCryptoBlockLUKS *luks; + QCryptoBlockLUKS *luks = NULL; Error *local_err = NULL; int ret = 0; size_t i; ssize_t rv; g_autofree uint8_t *masterkey = NULL; char *ivgen_name, *ivhash_name; - QCryptoCipherMode ciphermode; - QCryptoCipherAlgorithm cipheralg; - QCryptoIVGenAlgorithm ivalg; - QCryptoCipherAlgorithm ivcipheralg; - QCryptoHashAlgorithm hash; - QCryptoHashAlgorithm ivhash; g_autofree char *password = NULL; g_autofree char *cipher_mode = NULL; @@ -716,13 +707,13 @@ qcrypto_block_luks_open(QCryptoBlock *block, ivhash_name = strchr(ivgen_name, ':'); if (!ivhash_name) { - ivhash = 0; + luks->ivgen_hash_alg = 0; } else { *ivhash_name = '\0'; ivhash_name++; - ivhash = qcrypto_block_luks_hash_name_lookup(ivhash_name, - &local_err); + luks->ivgen_hash_alg = qcrypto_block_luks_hash_name_lookup(ivhash_name, + &local_err); if (local_err) { ret = -ENOTSUP; error_propagate(errp, local_err); @@ -730,17 +721,17 @@ qcrypto_block_luks_open(QCryptoBlock *block, } } - ciphermode = qcrypto_block_luks_cipher_mode_lookup(cipher_mode, - &local_err); + luks->cipher_mode = qcrypto_block_luks_cipher_mode_lookup(cipher_mode, + &local_err); if (local_err) { ret = -ENOTSUP; error_propagate(errp, local_err); goto fail; } - cipheralg = + luks->cipher_alg = qcrypto_block_luks_cipher_name_lookup(luks->header.cipher_name, - ciphermode, + luks->cipher_mode, luks->header.master_key_len, &local_err); if (local_err) { @@ -749,31 +740,33 @@ qcrypto_block_luks_open(QCryptoBlock *block, goto fail; } - hash = qcrypto_block_luks_hash_name_lookup(luks->header.hash_spec, - &local_err); + luks->hash_alg = + qcrypto_block_luks_hash_name_lookup(luks->header.hash_spec, + &local_err); if (local_err) { ret = -ENOTSUP; error_propagate(errp, local_err); goto fail; } - ivalg = qcrypto_block_luks_ivgen_name_lookup(ivgen_name, - &local_err); + luks->ivgen_alg = qcrypto_block_luks_ivgen_name_lookup(ivgen_name, + &local_err); if (local_err) { ret = -ENOTSUP; error_propagate(errp, local_err); goto fail; } - if (ivalg == QCRYPTO_IVGEN_ALG_ESSIV) { + if (luks->ivgen_alg == QCRYPTO_IVGEN_ALG_ESSIV) { if (!ivhash_name) { ret = -EINVAL; error_setg(errp, "Missing IV generator hash specification"); goto fail; } - ivcipheralg = qcrypto_block_luks_essiv_cipher(cipheralg, - ivhash, - &local_err); + luks->ivgen_cipher_alg = + qcrypto_block_luks_essiv_cipher(luks->cipher_alg, + luks->ivgen_hash_alg, + &local_err); if (local_err) { ret = -ENOTSUP; error_propagate(errp, local_err); @@ -787,7 +780,7 @@ qcrypto_block_luks_open(QCryptoBlock *block, * ignore hash names with these ivgens rather than report * an error about the invalid usage */ - ivcipheralg = cipheralg; + luks->ivgen_cipher_alg = luks->cipher_alg; } if (!(flags & QCRYPTO_BLOCK_OPEN_NO_IO)) { @@ -799,11 +792,6 @@ qcrypto_block_luks_open(QCryptoBlock *block, if (qcrypto_block_luks_find_key(block, password, - cipheralg, ciphermode, - hash, - ivalg, - ivcipheralg, - ivhash, masterkey, readfunc, opaque, errp) < 0) { @@ -814,12 +802,13 @@ qcrypto_block_luks_open(QCryptoBlock *block, /* We have a valid master key now, so can setup the * block device payload decryption objects */ - block->kdfhash = hash; - block->niv = qcrypto_cipher_get_iv_len(cipheralg, - ciphermode); - block->ivgen = qcrypto_ivgen_new(ivalg, - ivcipheralg, - ivhash, + block->kdfhash = luks->hash_alg; + block->niv = qcrypto_cipher_get_iv_len(luks->cipher_alg, + luks->cipher_mode); + + block->ivgen = qcrypto_ivgen_new(luks->ivgen_alg, + luks->ivgen_cipher_alg, + luks->ivgen_hash_alg, masterkey, luks->header.master_key_len, errp); @@ -828,7 +817,9 @@ qcrypto_block_luks_open(QCryptoBlock *block, goto fail; } - ret = qcrypto_block_init_cipher(block, cipheralg, ciphermode, + ret = qcrypto_block_init_cipher(block, + luks->cipher_alg, + luks->cipher_mode, masterkey, luks->header.master_key_len, n_threads, @@ -843,11 +834,6 @@ qcrypto_block_luks_open(QCryptoBlock *block, block->payload_offset = luks->header.payload_offset_sector * block->sector_size; - luks->cipher_alg = cipheralg; - luks->cipher_mode = ciphermode; - luks->ivgen_alg = ivalg; - luks->ivgen_hash_alg = ivhash; - luks->hash_alg = hash; return 0; @@ -893,7 +879,6 @@ qcrypto_block_luks_create(QCryptoBlock *block, const char *ivgen_hash_alg = NULL; const char *hash_alg; g_autofree char *cipher_mode_spec = NULL; - QCryptoCipherAlgorithm ivcipheralg = 0; uint64_t iters; memcpy(&luks_opts, &options->u.luks, sizeof(luks_opts)); @@ -918,6 +903,17 @@ qcrypto_block_luks_create(QCryptoBlock *block, luks_opts.has_ivgen_hash_alg = true; } } + + luks = g_new0(QCryptoBlockLUKS, 1); + block->opaque = luks; + + luks->cipher_alg = luks_opts.cipher_alg; + luks->cipher_mode = luks_opts.cipher_mode; + luks->ivgen_alg = luks_opts.ivgen_alg; + luks->ivgen_hash_alg = luks_opts.ivgen_hash_alg; + luks->hash_alg = luks_opts.hash_alg; + + /* Note we're allowing ivgen_hash_alg to be set even for * non-essiv iv generators that don't need a hash. It will * be silently ignored, for compatibility with dm-crypt */ @@ -925,15 +921,13 @@ qcrypto_block_luks_create(QCryptoBlock *block, if (!options->u.luks.key_secret) { error_setg(errp, "Parameter '%skey-secret' is required for cipher", optprefix ? optprefix : ""); - return -1; + goto error; } password = qcrypto_secret_lookup_as_utf8(luks_opts.key_secret, errp); if (!password) { - return -1; + goto error; } - luks = g_new0(QCryptoBlockLUKS, 1); - block->opaque = luks; memcpy(luks->header.magic, qcrypto_block_luks_magic, QCRYPTO_BLOCK_LUKS_MAGIC_LEN); @@ -980,15 +974,16 @@ qcrypto_block_luks_create(QCryptoBlock *block, } if (luks_opts.ivgen_alg == QCRYPTO_IVGEN_ALG_ESSIV) { - ivcipheralg = qcrypto_block_luks_essiv_cipher(luks_opts.cipher_alg, - luks_opts.ivgen_hash_alg, - &local_err); + luks->ivgen_cipher_alg = + qcrypto_block_luks_essiv_cipher(luks_opts.cipher_alg, + luks_opts.ivgen_hash_alg, + &local_err); if (local_err) { error_propagate(errp, local_err); goto error; } } else { - ivcipheralg = luks_opts.cipher_alg; + luks->ivgen_cipher_alg = luks_opts.cipher_alg; } strcpy(luks->header.cipher_name, cipher_alg); @@ -1030,7 +1025,7 @@ qcrypto_block_luks_create(QCryptoBlock *block, block->niv = qcrypto_cipher_get_iv_len(luks_opts.cipher_alg, luks_opts.cipher_mode); block->ivgen = qcrypto_ivgen_new(luks_opts.ivgen_alg, - ivcipheralg, + luks->ivgen_cipher_alg, luks_opts.ivgen_hash_alg, masterkey, luks->header.master_key_len, errp); @@ -1183,7 +1178,7 @@ qcrypto_block_luks_create(QCryptoBlock *block, } ivgen = qcrypto_ivgen_new(luks_opts.ivgen_alg, - ivcipheralg, + luks->ivgen_cipher_alg, luks_opts.ivgen_hash_alg, slotkey, luks->header.master_key_len, errp); @@ -1294,12 +1289,6 @@ qcrypto_block_luks_create(QCryptoBlock *block, goto error; } - luks->cipher_alg = luks_opts.cipher_alg; - luks->cipher_mode = luks_opts.cipher_mode; - luks->ivgen_alg = luks_opts.ivgen_alg; - luks->ivgen_hash_alg = luks_opts.ivgen_hash_alg; - luks->hash_alg = luks_opts.hash_alg; - memset(masterkey, 0, luks->header.master_key_len); memset(slotkey, 0, luks->header.master_key_len); |