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Fix internal crypt segment compare routine.

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The function is supposed to check if manipulated
active dm-crypt device matches the on-disk metadata.
Unfortunately it did not take into account differences
between normal cipher specification (aes-xts-plain64)
and capi format specification (capi:xts(aes)-plain64).
The internal query function always converted capi format
in normal format and therefor failed if capi format was
used in metadata.

Fixes: #759.
This commit is contained in:
Ondrej Kozina
2022-10-11 11:48:13 +02:00
parent 19c15a652f
commit 3e4c69a017
2 changed files with 38 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

36
lib/setup.c
View File

@@ -2458,6 +2458,9 @@ static int _compare_crypt_devices(struct crypt_device *cd,
const struct dm_target *src,
const struct dm_target *tgt)
{
char *src_cipher = NULL, *src_integrity = NULL;
int r = -EINVAL;
/* for crypt devices keys are mandatory */
if (!src->u.crypt.vk || !tgt->u.crypt.vk)
return -EINVAL;
@@ -2465,21 +2468,30 @@ static int _compare_crypt_devices(struct crypt_device *cd,
/* CIPHER checks */
if (!src->u.crypt.cipher || !tgt->u.crypt.cipher)
return -EINVAL;
if (strcmp(src->u.crypt.cipher, tgt->u.crypt.cipher)) {
log_dbg(cd, "Cipher specs do not match.");
/*
* dm_query_target converts capi cipher specification to dm-crypt format.
* We need to do same for cipher specification requested in source
* device.
*/
if (crypt_capi_to_cipher(&src_cipher, &src_integrity, src->u.crypt.cipher, src->u.crypt.integrity))
return -EINVAL;
if (strcmp(src_cipher, tgt->u.crypt.cipher)) {
log_dbg(cd, "Cipher specs do not match.");
goto out;
}
if (tgt->u.crypt.vk->keylength == 0 && crypt_is_cipher_null(tgt->u.crypt.cipher))
log_dbg(cd, "Existing device uses cipher null. Skipping key comparison.");
else if (_compare_volume_keys(src->u.crypt.vk, 0, tgt->u.crypt.vk, tgt->u.crypt.vk->key_description != NULL)) {
log_dbg(cd, "Keys in context and target device do not match.");
return -EINVAL;
goto out;
}
if (crypt_strcmp(src->u.crypt.integrity, tgt->u.crypt.integrity)) {
if (crypt_strcmp(src_integrity, tgt->u.crypt.integrity)) {
log_dbg(cd, "Integrity parameters do not match.");
return -EINVAL;
goto out;
}
if (src->u.crypt.offset != tgt->u.crypt.offset ||
@@ -2487,15 +2499,19 @@ static int _compare_crypt_devices(struct crypt_device *cd,
src->u.crypt.iv_offset != tgt->u.crypt.iv_offset ||
src->u.crypt.tag_size != tgt->u.crypt.tag_size) {
log_dbg(cd, "Integer parameters do not match.");
return -EINVAL;
goto out;
}
if (device_is_identical(src->data_device, tgt->data_device) <= 0) {
if (device_is_identical(src->data_device, tgt->data_device) <= 0)
log_dbg(cd, "Data devices do not match.");
return -EINVAL;
}
else
r = 0;
return 0;
out:
free(src_cipher);
free(src_integrity);
return r;
}
static int _compare_integrity_devices(struct crypt_device *cd,

14
tests/api-test-2.c
View File

@@ -1585,8 +1585,8 @@ static void ResizeDeviceLuks2(void)
const char *vk_hex = "bb21158c733229347bd4e681891e213d94c685be6a5b84818afe7a78a6de7a1a";
size_t key_size = strlen(vk_hex) / 2;
const char *cipher = "aes";
const char *cipher_mode = "cbc-essiv:sha256";
const char *cipher = "aes", *capi_cipher = "capi:cbc(aes)";
const char *cipher_mode = "cbc-essiv:sha256", *capi_cipher_mode = "essiv:sha256";
uint64_t r_payload_offset, r_header_size, r_size;
/* Cannot use Argon2 in FIPS */
@@ -1728,6 +1728,16 @@ static void ResizeDeviceLuks2(void)
OK_(crypt_deactivate(cd, CDEVICE_1));
CRYPT_FREE(cd);
OK_(crypt_init(&cd, DMDIR L_DEVICE_OK));
OK_(crypt_set_pbkdf_type(cd, &min_pbkdf2));
OK_(crypt_format(cd, CRYPT_LUKS2, capi_cipher, capi_cipher_mode, NULL, key, key_size, NULL));
OK_(crypt_activate_by_volume_key(cd, CDEVICE_1, key, key_size, 0));
OK_(crypt_resize(cd, CDEVICE_1, 8));
if (!t_device_size(DMDIR CDEVICE_1, &r_size))
EQ_(8, r_size >> TST_SECTOR_SHIFT);
OK_(crypt_deactivate(cd, CDEVICE_1));
CRYPT_FREE(cd);
_cleanup_dmdevices();
}