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ecryptfs: release keys loaded in ecryptfs_keyring_auth_tok_for_sig()

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This patch allows keys requested in the function
ecryptfs_keyring_auth_tok_for_sig()to be released when they are no
longer required. In particular keys are directly released in the same
function if the obtained authentication token is not valid.

Further, a new function parameter 'auth_tok_key' has been added to
ecryptfs_find_auth_tok_for_sig() in order to provide callers the key
pointer to be passed to key_put().

Signed-off-by: Roberto Sassu <roberto.sassu@polito.it>
Cc: Dustin Kirkland <kirkland@canonical.com>
Cc: James Morris <jmorris@namei.org>
[Tyler: Initialize auth_tok_key to NULL in ecryptfs_parse_packet_set]
Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
This commit is contained in:
Roberto Sassu 2010-10-06 18:31:06 +02:00 committed by Tyler Hicks
parent 2e21b3f124
commit aee683b9e7
1 changed files with 28 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
fs/ecryptfs/keystore.c
View File

@ -446,6 +446,7 @@ out:
*/
static int
ecryptfs_find_auth_tok_for_sig(
struct key **auth_tok_key,
struct ecryptfs_auth_tok **auth_tok,
struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
char *sig)
@ -453,12 +454,12 @@ ecryptfs_find_auth_tok_for_sig(
struct ecryptfs_global_auth_tok *global_auth_tok;
int rc = 0;
(*auth_tok_key) = NULL;
(*auth_tok) = NULL;
if (ecryptfs_find_global_auth_tok_for_sig(&global_auth_tok,
mount_crypt_stat, sig)) {
struct key *auth_tok_key;
rc = ecryptfs_keyring_auth_tok_for_sig(&auth_tok_key, auth_tok,
rc = ecryptfs_keyring_auth_tok_for_sig(auth_tok_key, auth_tok,
sig);
} else
(*auth_tok) = global_auth_tok->global_auth_tok;
@ -509,6 +510,7 @@ ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
char *filename, size_t filename_size)
{
struct ecryptfs_write_tag_70_packet_silly_stack *s;
struct key *auth_tok_key = NULL;
int rc = 0;
s = kmalloc(sizeof(*s), GFP_KERNEL);
@ -606,6 +608,7 @@ ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes,
}
dest[s->i++] = s->cipher_code;
rc = ecryptfs_find_auth_tok_for_sig(
&auth_tok_key,
&s->auth_tok, mount_crypt_stat,
mount_crypt_stat->global_default_fnek_sig);
if (rc) {
@ -753,6 +756,8 @@ out_free_unlock:
out_unlock:
mutex_unlock(s->tfm_mutex);
out:
if (auth_tok_key)
key_put(auth_tok_key);
kfree(s);
return rc;
}
@ -798,6 +803,7 @@ ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size,
char *data, size_t max_packet_size)
{
struct ecryptfs_parse_tag_70_packet_silly_stack *s;
struct key *auth_tok_key = NULL;
int rc = 0;
(*packet_size) = 0;
@ -910,7 +916,8 @@ ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size,
* >= ECRYPTFS_MAX_IV_BYTES. */
memset(s->iv, 0, ECRYPTFS_MAX_IV_BYTES);
s->desc.info = s->iv;
rc = ecryptfs_find_auth_tok_for_sig(&s->auth_tok, mount_crypt_stat,
rc = ecryptfs_find_auth_tok_for_sig(&auth_tok_key,
&s->auth_tok, mount_crypt_stat,
s->fnek_sig_hex);
if (rc) {
printk(KERN_ERR "%s: Error attempting to find auth tok for "
@ -986,6 +993,8 @@ out:
(*filename_size) = 0;
(*filename) = NULL;
}
if (auth_tok_key)
key_put(auth_tok_key);
kfree(s);
return rc;
}
@ -1557,14 +1566,19 @@ int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key,
ECRYPTFS_VERSION_MAJOR,
ECRYPTFS_VERSION_MINOR);
rc = -EINVAL;
goto out;
goto out_release_key;
}
if ((*auth_tok)->token_type != ECRYPTFS_PASSWORD
&& (*auth_tok)->token_type != ECRYPTFS_PRIVATE_KEY) {
printk(KERN_ERR "Invalid auth_tok structure "
"returned from key query\n");
rc = -EINVAL;
goto out;
goto out_release_key;
}
out_release_key:
if (rc) {
key_put(*auth_tok_key);
(*auth_tok_key) = NULL;
}
out:
return rc;
@ -1688,6 +1702,7 @@ int ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat,
struct ecryptfs_auth_tok_list_item *auth_tok_list_item;
size_t tag_11_contents_size;
size_t tag_11_packet_size;
struct key *auth_tok_key = NULL;
int rc = 0;
INIT_LIST_HEAD(&auth_tok_list);
@ -1784,6 +1799,10 @@ int ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat,
* just one will be sufficient to decrypt to get the FEK. */
find_next_matching_auth_tok:
found_auth_tok = 0;
if (auth_tok_key) {
key_put(auth_tok_key);
auth_tok_key = NULL;
}
list_for_each_entry(auth_tok_list_item, &auth_tok_list, list) {
candidate_auth_tok = &auth_tok_list_item->auth_tok;
if (unlikely(ecryptfs_verbosity > 0)) {
@ -1800,7 +1819,8 @@ find_next_matching_auth_tok:
rc = -EINVAL;
goto out_wipe_list;
}
ecryptfs_find_auth_tok_for_sig(&matching_auth_tok,
ecryptfs_find_auth_tok_for_sig(&auth_tok_key,
&matching_auth_tok,
crypt_stat->mount_crypt_stat,
candidate_auth_tok_sig);
if (matching_auth_tok) {
@ -1866,6 +1886,8 @@ found_matching_auth_tok:
out_wipe_list:
wipe_auth_tok_list(&auth_tok_list);
out:
if (auth_tok_key)
key_put(auth_tok_key);
return rc;
}