diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/crypto/public_key.h | 15 | ||||
| -rw-r--r-- | include/keys/system_keyring.h | 6 | ||||
| -rw-r--r-- | include/linux/key-type.h | 8 | ||||
| -rw-r--r-- | include/linux/key.h | 34 | ||||
| -rw-r--r-- | include/uapi/linux/keyctl.h | 1 |
5 files changed, 48 insertions, 16 deletions
diff --git a/include/crypto/public_key.h b/include/crypto/public_key.h index 882ca0e1e7a5..e0b681a717ba 100644 --- a/include/crypto/public_key.h +++ b/include/crypto/public_key.h @@ -50,9 +50,20 @@ struct key; struct key_type; union key_payload; -extern int restrict_link_by_signature(struct key *trust_keyring, +extern int restrict_link_by_signature(struct key *dest_keyring, const struct key_type *type, - const union key_payload *payload); + const union key_payload *payload, + struct key *trust_keyring); + +extern int restrict_link_by_key_or_keyring(struct key *dest_keyring, + const struct key_type *type, + const union key_payload *payload, + struct key *trusted); + +extern int restrict_link_by_key_or_keyring_chain(struct key *trust_keyring, + const struct key_type *type, + const union key_payload *payload, + struct key *trusted); extern int verify_signature(const struct key *key, const struct public_key_signature *sig); diff --git a/include/keys/system_keyring.h b/include/keys/system_keyring.h index 0d8762622ab9..359c2f936004 100644 --- a/include/keys/system_keyring.h +++ b/include/keys/system_keyring.h @@ -18,7 +18,8 @@ extern int restrict_link_by_builtin_trusted(struct key *keyring, const struct key_type *type, - const union key_payload *payload); + const union key_payload *payload, + struct key *restriction_key); #else #define restrict_link_by_builtin_trusted restrict_link_reject @@ -28,7 +29,8 @@ extern int restrict_link_by_builtin_trusted(struct key *keyring, extern int restrict_link_by_builtin_and_secondary_trusted( struct key *keyring, const struct key_type *type, - const union key_payload *payload); + const union key_payload *payload, + struct key *restriction_key); #else #define restrict_link_by_builtin_and_secondary_trusted restrict_link_by_builtin_trusted #endif 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 */ diff --git a/include/linux/key.h b/include/linux/key.h index 9d9fac583dd3..0c9b93b0d1f7 100644 --- a/include/linux/key.h +++ b/include/linux/key.h @@ -127,6 +127,17 @@ static inline bool is_key_possessed(const key_ref_t key_ref) return (unsigned long) key_ref & 1UL; } +typedef int (*key_restrict_link_func_t)(struct key *dest_keyring, + const struct key_type *type, + const union key_payload *payload, + struct key *restriction_key); + +struct key_restriction { + key_restrict_link_func_t check; + struct key *key; + struct key_type *keytype; +}; + /*****************************************************************************/ /* * authentication token / access credential / keyring @@ -206,18 +217,17 @@ struct key { }; /* This is set on a keyring to restrict the addition of a link to a key - * to it. If this method isn't provided then it is assumed that the + * to it. If this structure isn't provided then it is assumed that the * keyring is open to any addition. It is ignored for non-keyring - * keys. + * keys. Only set this value using keyring_restrict(), keyring_alloc(), + * or key_alloc(). * * This is intended for use with rings of trusted keys whereby addition * to the keyring needs to be controlled. KEY_ALLOC_BYPASS_RESTRICTION * overrides this, allowing the kernel to add extra keys without * restriction. */ - int (*restrict_link)(struct key *keyring, - const struct key_type *type, - const union key_payload *payload); + struct key_restriction *restrict_link; }; extern struct key *key_alloc(struct key_type *type, @@ -226,9 +236,7 @@ extern struct key *key_alloc(struct key_type *type, const struct cred *cred, key_perm_t perm, unsigned long flags, - int (*restrict_link)(struct key *, - const struct key_type *, - const union key_payload *)); + struct key_restriction *restrict_link); #define KEY_ALLOC_IN_QUOTA 0x0000 /* add to quota, reject if would overrun */ @@ -304,14 +312,13 @@ extern struct key *keyring_alloc(const char *description, kuid_t uid, kgid_t gid const struct cred *cred, key_perm_t perm, unsigned long flags, - int (*restrict_link)(struct key *, - const struct key_type *, - const union key_payload *), + struct key_restriction *restrict_link, struct key *dest); extern int restrict_link_reject(struct key *keyring, const struct key_type *type, - const union key_payload *payload); + const union key_payload *payload, + struct key *restriction_key); extern int keyring_clear(struct key *keyring); @@ -322,6 +329,9 @@ extern key_ref_t keyring_search(key_ref_t keyring, extern int keyring_add_key(struct key *keyring, struct key *key); +extern int keyring_restrict(key_ref_t keyring, const char *type, + const char *restriction); + extern struct key *key_lookup(key_serial_t id); static inline key_serial_t key_serial(const struct key *key) diff --git a/include/uapi/linux/keyctl.h b/include/uapi/linux/keyctl.h index 86eddd6241f3..ff79c44e49a3 100644 --- a/include/uapi/linux/keyctl.h +++ b/include/uapi/linux/keyctl.h @@ -60,6 +60,7 @@ #define KEYCTL_INVALIDATE 21 /* invalidate a key */ #define KEYCTL_GET_PERSISTENT 22 /* get a user's persistent keyring */ #define KEYCTL_DH_COMPUTE 23 /* Compute Diffie-Hellman values */ +#define KEYCTL_RESTRICT_KEYRING 29 /* Restrict keys allowed to link to a keyring */ /* keyctl structures */ struct keyctl_dh_params { |