2019-05-21 01:08:01 +08:00
|
|
|
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
2007-10-17 14:29:46 +08:00
|
|
|
/* Definitions for key type implementations
|
|
|
|
*
|
|
|
|
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
|
|
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
|
|
*/
|
|
|
|
|
|
|
|
#ifndef _LINUX_KEY_TYPE_H
|
|
|
|
#define _LINUX_KEY_TYPE_H
|
|
|
|
|
|
|
|
#include <linux/key.h>
|
2012-07-23 22:37:31 +08:00
|
|
|
#include <linux/errno.h>
|
2007-10-17 14:29:46 +08:00
|
|
|
|
|
|
|
#ifdef CONFIG_KEYS
|
|
|
|
|
2018-10-10 00:46:51 +08:00
|
|
|
struct kernel_pkey_query;
|
|
|
|
struct kernel_pkey_params;
|
|
|
|
|
2012-09-13 20:06:29 +08:00
|
|
|
/*
|
|
|
|
* Pre-parsed payload, used by key add, update and instantiate.
|
|
|
|
*
|
|
|
|
* This struct will be cleared and data and datalen will be set with the data
|
|
|
|
* and length parameters from the caller and quotalen will be set from
|
|
|
|
* def_datalen from the key type. Then if the preparse() op is provided by the
|
|
|
|
* key type, that will be called. Then the struct will be passed to the
|
|
|
|
* instantiate() or the update() op.
|
|
|
|
*
|
|
|
|
* If the preparse() op is given, the free_preparse() op will be called to
|
|
|
|
* clear the contents.
|
|
|
|
*/
|
|
|
|
struct key_preparsed_payload {
|
2020-09-16 18:12:03 +08:00
|
|
|
const char *orig_description; /* Actual or proposed description (maybe NULL) */
|
2012-09-13 20:06:29 +08:00
|
|
|
char *description; /* Proposed key description (or NULL) */
|
2015-10-21 21:04:48 +08:00
|
|
|
union key_payload payload; /* Proposed payload */
|
2012-09-13 20:06:29 +08:00
|
|
|
const void *data; /* Raw data */
|
|
|
|
size_t datalen; /* Raw datalen */
|
|
|
|
size_t quotalen; /* Quota length for proposed payload */
|
2017-11-16 00:38:45 +08:00
|
|
|
time64_t expiry; /* Expiry time of key */
|
2016-10-28 16:22:25 +08:00
|
|
|
} __randomize_layout;
|
2012-09-13 20:06:29 +08:00
|
|
|
|
2019-02-15 00:20:25 +08:00
|
|
|
typedef int (*request_key_actor_t)(struct key *auth_key, void *aux);
|
2007-10-17 14:29:46 +08:00
|
|
|
|
2014-09-17 00:36:02 +08:00
|
|
|
/*
|
|
|
|
* Preparsed matching criterion.
|
|
|
|
*/
|
|
|
|
struct key_match_data {
|
2014-09-17 00:36:08 +08:00
|
|
|
/* Comparison function, defaults to exact description match, but can be
|
|
|
|
* overridden by type->match_preparse(). Should return true if a match
|
|
|
|
* is found and false if not.
|
|
|
|
*/
|
|
|
|
bool (*cmp)(const struct key *key,
|
|
|
|
const struct key_match_data *match_data);
|
2014-09-17 00:36:02 +08:00
|
|
|
|
|
|
|
const void *raw_data; /* Raw match data */
|
|
|
|
void *preparsed; /* For ->match_preparse() to stash stuff */
|
|
|
|
unsigned lookup_type; /* Type of lookup for this search. */
|
|
|
|
#define KEYRING_SEARCH_LOOKUP_DIRECT 0x0000 /* Direct lookup by description. */
|
|
|
|
#define KEYRING_SEARCH_LOOKUP_ITERATE 0x0001 /* Iterative search. */
|
|
|
|
};
|
|
|
|
|
2007-10-17 14:29:46 +08:00
|
|
|
/*
|
|
|
|
* kernel managed key type definition
|
|
|
|
*/
|
|
|
|
struct key_type {
|
|
|
|
/* name of the type */
|
|
|
|
const char *name;
|
|
|
|
|
|
|
|
/* default payload length for quota precalculation (optional)
|
|
|
|
* - this can be used instead of calling key_payload_reserve(), that
|
|
|
|
* function only needs to be called if the real datalen is different
|
|
|
|
*/
|
|
|
|
size_t def_datalen;
|
|
|
|
|
2019-06-27 04:02:33 +08:00
|
|
|
unsigned int flags;
|
|
|
|
#define KEY_TYPE_NET_DOMAIN 0x00000001 /* Keys of this type have a net namespace domain */
|
|
|
|
|
2011-03-07 23:05:59 +08:00
|
|
|
/* vet a description */
|
|
|
|
int (*vet_description)(const char *description);
|
|
|
|
|
2012-09-13 20:06:29 +08:00
|
|
|
/* Preparse the data blob from userspace that is to be the payload,
|
|
|
|
* generating a proposed description and payload that will be handed to
|
|
|
|
* the instantiate() and update() ops.
|
|
|
|
*/
|
|
|
|
int (*preparse)(struct key_preparsed_payload *prep);
|
|
|
|
|
|
|
|
/* Free a preparse data structure.
|
|
|
|
*/
|
|
|
|
void (*free_preparse)(struct key_preparsed_payload *prep);
|
|
|
|
|
2007-10-17 14:29:46 +08:00
|
|
|
/* instantiate a key of this type
|
|
|
|
* - this method should call key_payload_reserve() to determine if the
|
|
|
|
* user's quota will hold the payload
|
|
|
|
*/
|
2012-09-13 20:06:29 +08:00
|
|
|
int (*instantiate)(struct key *key, struct key_preparsed_payload *prep);
|
2007-10-17 14:29:46 +08:00
|
|
|
|
|
|
|
/* update a key of this type (optional)
|
|
|
|
* - this method should call key_payload_reserve() to recalculate the
|
|
|
|
* quota consumption
|
|
|
|
* - the key must be locked against read when modifying
|
|
|
|
*/
|
2012-09-13 20:06:29 +08:00
|
|
|
int (*update)(struct key *key, struct key_preparsed_payload *prep);
|
2007-10-17 14:29:46 +08:00
|
|
|
|
2014-09-17 00:36:02 +08:00
|
|
|
/* Preparse the data supplied to ->match() (optional). The
|
|
|
|
* data to be preparsed can be found in match_data->raw_data.
|
|
|
|
* The lookup type can also be set by this function.
|
|
|
|
*/
|
|
|
|
int (*match_preparse)(struct key_match_data *match_data);
|
|
|
|
|
|
|
|
/* Free preparsed match data (optional). This should be supplied it
|
|
|
|
* ->match_preparse() is supplied. */
|
|
|
|
void (*match_free)(struct key_match_data *match_data);
|
2007-10-17 14:29:46 +08:00
|
|
|
|
|
|
|
/* clear some of the data from a key on revokation (optional)
|
|
|
|
* - the key's semaphore will be write-locked by the caller
|
|
|
|
*/
|
|
|
|
void (*revoke)(struct key *key);
|
|
|
|
|
|
|
|
/* clear the data from a key (optional) */
|
|
|
|
void (*destroy)(struct key *key);
|
|
|
|
|
|
|
|
/* describe a key */
|
|
|
|
void (*describe)(const struct key *key, struct seq_file *p);
|
|
|
|
|
|
|
|
/* read a key's data (optional)
|
|
|
|
* - permission checks will be done by the caller
|
|
|
|
* - the key's semaphore will be readlocked by the caller
|
|
|
|
* - should return the amount of data that could be read, no matter how
|
|
|
|
* much is copied into the buffer
|
|
|
|
* - shouldn't do the copy if the buffer is NULL
|
|
|
|
*/
|
2020-03-22 09:11:24 +08:00
|
|
|
long (*read)(const struct key *key, char *buffer, size_t buflen);
|
2007-10-17 14:29:46 +08:00
|
|
|
|
|
|
|
/* handle request_key() for this type instead of invoking
|
|
|
|
* /sbin/request-key (optional)
|
|
|
|
* - key is the key to instantiate
|
|
|
|
* - authkey is the authority to assume when instantiating this key
|
|
|
|
* - op is the operation to be done, usually "create"
|
|
|
|
* - the call must not return until the instantiation process has run
|
|
|
|
* its course
|
|
|
|
*/
|
|
|
|
request_key_actor_t request_key;
|
|
|
|
|
2016-05-07 06:38:17 +08:00
|
|
|
/* 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);
|
|
|
|
|
2018-10-10 00:46:51 +08:00
|
|
|
/* Asymmetric key accessor functions. */
|
|
|
|
int (*asym_query)(const struct kernel_pkey_params *params,
|
|
|
|
struct kernel_pkey_query *info);
|
|
|
|
int (*asym_eds_op)(struct kernel_pkey_params *params,
|
|
|
|
const void *in, void *out);
|
|
|
|
int (*asym_verify_signature)(struct kernel_pkey_params *params,
|
|
|
|
const void *in, const void *in2);
|
|
|
|
|
2007-10-17 14:29:46 +08:00
|
|
|
/* internal fields */
|
|
|
|
struct list_head link; /* link in types list */
|
2011-11-16 19:15:54 +08:00
|
|
|
struct lock_class_key lock_class; /* key->sem lock class */
|
2016-10-28 16:22:25 +08:00
|
|
|
} __randomize_layout;
|
2007-10-17 14:29:46 +08:00
|
|
|
|
|
|
|
extern struct key_type key_type_keyring;
|
|
|
|
|
|
|
|
extern int register_key_type(struct key_type *ktype);
|
|
|
|
extern void unregister_key_type(struct key_type *ktype);
|
|
|
|
|
|
|
|
extern int key_payload_reserve(struct key *key, size_t datalen);
|
|
|
|
extern int key_instantiate_and_link(struct key *key,
|
|
|
|
const void *data,
|
|
|
|
size_t datalen,
|
|
|
|
struct key *keyring,
|
2019-02-15 00:20:25 +08:00
|
|
|
struct key *authkey);
|
2011-03-07 23:06:09 +08:00
|
|
|
extern int key_reject_and_link(struct key *key,
|
2007-10-17 14:29:46 +08:00
|
|
|
unsigned timeout,
|
2011-03-07 23:06:09 +08:00
|
|
|
unsigned error,
|
2007-10-17 14:29:46 +08:00
|
|
|
struct key *keyring,
|
2019-02-15 00:20:25 +08:00
|
|
|
struct key *authkey);
|
|
|
|
extern void complete_request_key(struct key *authkey, int error);
|
2007-10-17 14:29:46 +08:00
|
|
|
|
2011-03-07 23:06:09 +08:00
|
|
|
static inline int key_negate_and_link(struct key *key,
|
|
|
|
unsigned timeout,
|
|
|
|
struct key *keyring,
|
2019-02-15 00:20:25 +08:00
|
|
|
struct key *authkey)
|
2011-03-07 23:06:09 +08:00
|
|
|
{
|
2019-02-15 00:20:25 +08:00
|
|
|
return key_reject_and_link(key, timeout, ENOKEY, keyring, authkey);
|
2011-03-07 23:06:09 +08:00
|
|
|
}
|
|
|
|
|
2014-07-19 01:56:34 +08:00
|
|
|
extern int generic_key_instantiate(struct key *key, struct key_preparsed_payload *prep);
|
|
|
|
|
2007-10-17 14:29:46 +08:00
|
|
|
#endif /* CONFIG_KEYS */
|
|
|
|
#endif /* _LINUX_KEY_TYPE_H */
|