diff options
| author | Mat Martineau <mathew.j.martineau@linux.intel.com> | 2016-05-06 15:38:17 -0700 |
|---|---|---|
| committer | Mat Martineau <mathew.j.martineau@linux.intel.com> | 2017-04-04 14:10:11 -0700 |
| commit | efba797b977c99bc6e0c301299272c80fb8b287f (patch) | |
| tree | 746410c0909fee9a126c418df1dd51b85a3a94ec | |
| parent | 2b6aa412ff23a02ac777ad307249c60a839cfd25 (diff) | |
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: Mat Martineau <mathew.j.martineau@linux.intel.com>
| -rw-r--r-- | Documentation/security/keys.txt | 9 | ||||
| -rw-r--r-- | include/linux/key-type.h | 8 |
2 files changed, 17 insertions, 0 deletions
diff --git a/Documentation/security/keys.txt b/Documentation/security/keys.txt index e35de987fc48..5fe04a7cc03d 100644 --- a/Documentation/security/keys.txt +++ b/Documentation/security/keys.txt @@ -1445,6 +1445,15 @@ The structure has a number of fields, some of which are mandatory: 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 ============================ diff --git a/include/linux/key-type.h b/include/linux/key-type.h index eaee981c5558..8496cf64575c 100644 --- a/include/linux/key-type.h +++ b/include/linux/key-type.h @@ -147,6 +147,14 @@ struct key_type { */ 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 */ struct list_head link; /* link in types list */ struct lock_class_key lock_class; /* key->sem lock class */ |