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qcrypto-luks: simplify masterkey and masterkey length 

Let the caller allocate masterkey
Always use master key len from the header

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Maxim Levitsky 2019-09-26 00:35:18 +03:00 committed by Daniel P. Berrangé
parent 70b2a1fed5
commit 1ddd52e4b5
1 changed files with 21 additions and 23 deletions
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44
crypto/block-luks.c
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@ -419,7 +419,6 @@ qcrypto_block_luks_load_key(QCryptoBlock *block,
QCryptoCipherAlgorithm ivcipheralg,
QCryptoHashAlgorithm ivhash,
uint8_t *masterkey,
size_t masterkeylen,
QCryptoBlockReadFunc readfunc,
void *opaque,
Error **errp)
@ -438,9 +437,9 @@ qcrypto_block_luks_load_key(QCryptoBlock *block,
return 0;
}
splitkeylen = masterkeylen * slot->stripes;
splitkeylen = luks->header.master_key_len * slot->stripes;
splitkey = g_new0(uint8_t, splitkeylen);
possiblekey = g_new0(uint8_t, masterkeylen);
possiblekey = g_new0(uint8_t, luks->header.master_key_len);
/*
* The user password is used to generate a (possible)
@ -453,7 +452,7 @@ qcrypto_block_luks_load_key(QCryptoBlock *block,
(const uint8_t *)password, strlen(password),
slot->salt, QCRYPTO_BLOCK_LUKS_SALT_LEN,
slot->iterations,
possiblekey, masterkeylen,
possiblekey, luks->header.master_key_len,
errp) < 0) {
return -1;
}
@ -478,7 +477,7 @@ 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, masterkeylen,
possiblekey, luks->header.master_key_len,
errp);
if (!cipher) {
return -1;
@ -489,7 +488,7 @@ qcrypto_block_luks_load_key(QCryptoBlock *block,
ivgen = qcrypto_ivgen_new(ivalg,
ivcipheralg,
ivhash,
possiblekey, masterkeylen,
possiblekey, luks->header.master_key_len,
errp);
if (!ivgen) {
return -1;
@ -519,7 +518,7 @@ qcrypto_block_luks_load_key(QCryptoBlock *block,
* it back together to get the actual master key.
*/
if (qcrypto_afsplit_decode(hash,
masterkeylen,
luks->header.master_key_len,
slot->stripes,
splitkey,
masterkey,
@ -537,11 +536,13 @@ qcrypto_block_luks_load_key(QCryptoBlock *block,
* header
*/
if (qcrypto_pbkdf2(hash,
masterkey, masterkeylen,
masterkey,
luks->header.master_key_len,
luks->header.master_key_salt,
QCRYPTO_BLOCK_LUKS_SALT_LEN,
luks->header.master_key_iterations,
keydigest, G_N_ELEMENTS(keydigest),
keydigest,
G_N_ELEMENTS(keydigest),
errp) < 0) {
return -1;
}
@ -574,8 +575,7 @@ qcrypto_block_luks_find_key(QCryptoBlock *block,
QCryptoIVGenAlgorithm ivalg,
QCryptoCipherAlgorithm ivcipheralg,
QCryptoHashAlgorithm ivhash,
uint8_t **masterkey,
size_t *masterkeylen,
uint8_t *masterkey,
QCryptoBlockReadFunc readfunc,
void *opaque,
Error **errp)
@ -584,9 +584,6 @@ qcrypto_block_luks_find_key(QCryptoBlock *block,
size_t i;
int rv;
*masterkey = g_new0(uint8_t, luks->header.master_key_len);
*masterkeylen = luks->header.master_key_len;
for (i = 0; i < QCRYPTO_BLOCK_LUKS_NUM_KEY_SLOTS; i++) {
rv = qcrypto_block_luks_load_key(block,
&luks->header.key_slots[i],
@ -597,8 +594,7 @@ qcrypto_block_luks_find_key(QCryptoBlock *block,
ivalg,
ivcipheralg,
ivhash,
*masterkey,
*masterkeylen,
masterkey,
readfunc,
opaque,
errp);
@ -613,9 +609,6 @@ qcrypto_block_luks_find_key(QCryptoBlock *block,
error_setg(errp, "Invalid password, cannot unlock any keyslot");
error:
g_free(*masterkey);
*masterkey = NULL;
*masterkeylen = 0;
return -1;
}
@ -636,7 +629,6 @@ qcrypto_block_luks_open(QCryptoBlock *block,
size_t i;
ssize_t rv;
g_autofree uint8_t *masterkey = NULL;
size_t masterkeylen;
char *ivgen_name, *ivhash_name;
QCryptoCipherMode ciphermode;
QCryptoCipherAlgorithm cipheralg;
@ -802,6 +794,9 @@ qcrypto_block_luks_open(QCryptoBlock *block,
/* Try to find which key slot our password is valid for
* and unlock the master key from that slot.
*/
masterkey = g_new0(uint8_t, luks->header.master_key_len);
if (qcrypto_block_luks_find_key(block,
password,
cipheralg, ciphermode,
@ -809,7 +804,7 @@ qcrypto_block_luks_open(QCryptoBlock *block,
ivalg,
ivcipheralg,
ivhash,
&masterkey, &masterkeylen,
masterkey,
readfunc, opaque,
errp) < 0) {
ret = -EACCES;
@ -825,7 +820,8 @@ qcrypto_block_luks_open(QCryptoBlock *block,
block->ivgen = qcrypto_ivgen_new(ivalg,
ivcipheralg,
ivhash,
masterkey, masterkeylen,
masterkey,
luks->header.master_key_len,
errp);
if (!block->ivgen) {
ret = -ENOTSUP;
@ -833,7 +829,9 @@ qcrypto_block_luks_open(QCryptoBlock *block,
}
ret = qcrypto_block_init_cipher(block, cipheralg, ciphermode,
masterkey, masterkeylen, n_threads,
masterkey,
luks->header.master_key_len,
n_threads,
errp);
if (ret < 0) {
ret = -ENOTSUP;