Commit efba797b authored by Mat Martineau's avatar Mat Martineau

KEYS: Add an optional lookup_restriction hook to key_type

The restrict_link functions used to validate keys as they are linked
to a keyring can be associated with specific key types.  Each key type
may be loaded (or not) at runtime, so lookup of restrict_link
functions needs to be part of the key type implementation to ensure
that the requested keys can be examined.
Signed-off-by: default avatarMat Martineau <mathew.j.martineau@linux.intel.com>
parent 2b6aa412
...@@ -1445,6 +1445,15 @@ The structure has a number of fields, some of which are mandatory: ...@@ -1445,6 +1445,15 @@ The structure has a number of fields, some of which are mandatory:
The authorisation key. The authorisation key.
(*) struct key_restriction *(*lookup_restriction)(const char *params);
This optional method is used to enable userspace configuration of keyring
restrictions. The restriction parameter string (not including the key type
name) is passed in, and this method returns a pointer to a key_restriction
structure containing the relevant functions and data to evaluate each
attempted key link operation. If there is no match, -EINVAL is returned.
============================ ============================
REQUEST-KEY CALLBACK SERVICE REQUEST-KEY CALLBACK SERVICE
============================ ============================
......
...@@ -147,6 +147,14 @@ struct key_type { ...@@ -147,6 +147,14 @@ struct key_type {
*/ */
request_key_actor_t request_key; request_key_actor_t request_key;
/* Look up a keyring access restriction (optional)
*
* - NULL is a valid return value (meaning the requested restriction
* is known but will never block addition of a key)
* - should return -EINVAL if the restriction is unknown
*/
struct key_restriction *(*lookup_restriction)(const char *params);
/* internal fields */ /* internal fields */
struct list_head link; /* link in types list */ struct list_head link; /* link in types list */
struct lock_class_key lock_class; /* key->sem lock class */ struct lock_class_key lock_class; /* key->sem lock class */
......
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