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Commit aee683b9 authored by Roberto Sassu's avatar Roberto Sassu Committed by Tyler Hicks
Browse files

ecryptfs: release keys loaded in ecryptfs_keyring_auth_tok_for_sig() 



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: default avatarRoberto 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: default avatarTyler Hicks <tyhicks@linux.vnet.ibm.com>
parent 2e21b3f1

fs/ecryptfs/keystore.c

+28 −6
Original line number Diff line number Diff line
@@ -446,6 +446,7 @@ ecryptfs_find_global_auth_tok_for_sig( 
 */

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 @@ ecryptfs_write_tag_70_packet(char *dest, size_t *remaining_bytes, 
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 @@ ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size, 
		(*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 @@ int ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat, 
			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 @@ int ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat, 
out_wipe_list:

	wipe_auth_tok_list(&auth_tok_list);

out:

	if (auth_tok_key)

		key_put(auth_tok_key);

	return rc;

}