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Add utils keyring helper to get keyring key size by id.

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This commit is contained in:
Ondrej Kozina
2025-05-07 14:10:32 +02:00
parent ae2a7cfc33
commit 0363ea7c57
2 changed files with 36 additions and 11 deletions
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44
lib/utils_keyring.c
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@@ -222,29 +222,45 @@ key_serial_t keyring_request_key_id(key_type_t key_type,
return kid;
}
int keyring_read_keysize(key_serial_t kid,
size_t *r_key_size)
{
long r;
assert(r_key_size);
/* just get payload size */
r = keyctl_read(kid, NULL, 0);
if (r > 0) {
*r_key_size = r;
return 0;
}
return -EINVAL;
}
int keyring_read_key(key_serial_t kid,
char **key,
size_t *key_size)
{
long r;
int r;
size_t len;
char *buf = NULL;
size_t len = 0;
assert(key);
assert(key_size);
/* just get payload size */
r = keyctl_read(kid, NULL, 0);
if (r > 0) {
len = r;
buf = crypt_safe_alloc(len);
if (!buf)
return -ENOMEM;
r = keyring_read_keysize(kid, &len);
if (r < 0)
return r;
/* retrieve actual payload data */
r = keyctl_read(kid, buf, len);
}
buf = crypt_safe_alloc(len);
if (!buf)
return -ENOMEM;
/* retrieve actual payload data */
r = keyctl_read(kid, buf, len);
if (r < 0) {
crypt_safe_free(buf);
return -EINVAL;
@@ -423,6 +439,12 @@ key_serial_t keyring_request_key_id(key_type_t key_type,
return -ENOTSUP;
}
int keyring_read_keysize(key_serial_t kid,
size_t *r_key_size)
{
return -ENOTSUP;
}
int keyring_read_key(key_serial_t kid,
char **key,
size_t *key_size)

3
lib/utils_keyring.h
View File

@@ -30,6 +30,9 @@ int keyring_check(void);
key_serial_t keyring_request_key_id(key_type_t key_type,
const char *key_description);
int keyring_read_keysize(key_serial_t kid,
size_t *r_key_size);
int keyring_read_key(key_serial_t kid,
char **key,
size_t *key_size);