From: "Daniel P. Berrangé" <berrange@redhat.com>
To: qemu-devel@nongnu.org
Cc: "Daniel P. Berrangé" <berrange@redhat.com>,
"Maxim Levitsky" <mlevitsk@redhat.com>
Subject: [PULL 03/11] qcrypto-luks: simplify masterkey and masterkey length
Date: Fri, 27 Sep 2019 10:59:18 +0100 [thread overview]
Message-ID: <20190927095926.22230-4-berrange@redhat.com> (raw)
In-Reply-To: <20190927095926.22230-1-berrange@redhat.com>
From: Maxim Levitsky <mlevitsk@redhat.com>
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>
---
crypto/block-luks.c | 44 +++++++++++++++++++++-----------------------
1 file changed, 21 insertions(+), 23 deletions(-)
diff --git a/crypto/block-luks.c b/crypto/block-luks.c
index 25f8a9f1c4..9e59a791a6 100644
--- a/crypto/block-luks.c
+++ b/crypto/block-luks.c
@@ -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;
--
2.21.0
next prev parent reply other threads:[~2019-09-27 13:35 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-27 9:59 [PULL 00/11] Qcrypto next patches Daniel P. Berrangé
2019-09-27 9:59 ` [PULL 01/11] qcrypto-luks: rename some fields in QCryptoBlockLUKSHeader Daniel P. Berrangé
2019-09-27 9:59 ` [PULL 02/11] qcrypto-luks: don't overwrite cipher_mode in header Daniel P. Berrangé
2019-09-27 9:59 ` Daniel P. Berrangé [this message]
2019-09-27 9:59 ` [PULL 04/11] qcrypto-luks: pass keyslot index rather that pointer to the keyslot Daniel P. Berrangé
2019-09-27 9:59 ` [PULL 05/11] qcrypto-luks: use the parsed encryption settings in QCryptoBlockLUKS Daniel P. Berrangé
2019-09-27 9:59 ` [PULL 06/11] qcrypto-luks: purge unused error codes from open callback Daniel P. Berrangé
2019-09-27 9:59 ` [PULL 07/11] qcrypto-luks: extract store and load header Daniel P. Berrangé
2019-09-27 9:59 ` [PULL 08/11] qcrypto-luks: extract check and parse header Daniel P. Berrangé
2019-09-27 9:59 ` [PULL 09/11] qcrypto-luks: extract store key function Daniel P. Berrangé
2019-09-27 9:59 ` [PULL 10/11] qcrypto-luks: simplify the math used for keyslot locations Daniel P. Berrangé
2019-09-27 9:59 ` [PULL 11/11] qcrypto-luks: more rigorous header checking Daniel P. Berrangé
2019-09-30 9:53 ` [PULL 00/11] Qcrypto next patches Peter Maydell
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