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Clean up keyring handling.

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Move all keyring functions to one place and separate LUKS2 specific
code to generic handling.

Also fix possible mismatch if volume key is in keyring but it is not native
LUKS2 device (libarary cannot process such a device properly).
This commit is contained in:
Milan Broz
2018-02-21 14:46:01 +01:00
parent 32700cc51b
commit fb6b4739e4
6 changed files with 245 additions and 227 deletions
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55
lib/luks2/luks2_digest.c
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@@ -341,3 +341,58 @@ void LUKS2_digests_erase_unused(struct crypt_device *cd,
}
}
}
/* Key description helpers */
static char *get_key_description_by_digest(struct crypt_device *cd, int digest)
{
char *desc, digest_str[3];
int r;
size_t len;
if (!crypt_get_uuid(cd))
return NULL;
r = snprintf(digest_str, sizeof(digest_str), "d%u", digest);
if (r < 0 || (size_t)r >= sizeof(digest_str))
return NULL;
/* "cryptsetup:<uuid>-<digest_str>" + \0 */
len = strlen(crypt_get_uuid(cd)) + strlen(digest_str) + 13;
desc = malloc(len);
if (!desc)
return NULL;
r = snprintf(desc, len, "%s:%s-%s", "cryptsetup", crypt_get_uuid(cd), digest_str);
if (r < 0 || (size_t)r >= len) {
free(desc);
return NULL;
}
return desc;
}
int LUKS2_key_description_by_segment(struct crypt_device *cd,
struct luks2_hdr *hdr, struct volume_key *vk, int segment)
{
char *desc = get_key_description_by_digest(cd, LUKS2_digest_by_segment(cd, hdr, segment));
int r;
r = crypt_volume_key_set_description(vk, desc);
free(desc);
return r;
}
int LUKS2_volume_key_load_in_keyring_by_keyslot(struct crypt_device *cd,
struct luks2_hdr *hdr, struct volume_key *vk, int keyslot)
{
char *desc = get_key_description_by_digest(cd, LUKS2_digest_by_keyslot(cd, hdr, keyslot));
int r;
r = crypt_volume_key_set_description(vk, desc);
if (!r)
r = crypt_volume_key_load_in_keyring(cd, vk);
free(desc);
return r;
}