187 lines
6.2 KiB
C
187 lines
6.2 KiB
C
/* Definitions for key type implementations
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#ifndef _LINUX_KEY_TYPE_H
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#define _LINUX_KEY_TYPE_H
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#include <linux/key.h>
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#include <linux/errno.h>
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#ifdef CONFIG_KEYS
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/*
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* key under-construction record
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* - passed to the request_key actor if supplied
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*/
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struct key_construction {
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struct key *key; /* key being constructed */
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struct key *authkey;/* authorisation for key being constructed */
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};
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/*
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* Pre-parsed payload, used by key add, update and instantiate.
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*
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* This struct will be cleared and data and datalen will be set with the data
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* and length parameters from the caller and quotalen will be set from
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* def_datalen from the key type. Then if the preparse() op is provided by the
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* key type, that will be called. Then the struct will be passed to the
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* instantiate() or the update() op.
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*
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* If the preparse() op is given, the free_preparse() op will be called to
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* clear the contents.
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*/
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struct key_preparsed_payload {
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char *description; /* Proposed key description (or NULL) */
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void *type_data[2]; /* Private key-type data */
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void *payload[2]; /* Proposed payload */
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const void *data; /* Raw data */
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size_t datalen; /* Raw datalen */
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size_t quotalen; /* Quota length for proposed payload */
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time_t expiry; /* Expiry time of key */
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bool trusted; /* True if key is trusted */
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};
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typedef int (*request_key_actor_t)(struct key_construction *key,
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const char *op, void *aux);
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/*
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* Preparsed matching criterion.
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*/
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struct key_match_data {
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/* Comparison function, defaults to exact description match, but can be
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* overridden by type->match_preparse(). Should return true if a match
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* is found and false if not.
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*/
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bool (*cmp)(const struct key *key,
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const struct key_match_data *match_data);
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const void *raw_data; /* Raw match data */
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void *preparsed; /* For ->match_preparse() to stash stuff */
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unsigned lookup_type; /* Type of lookup for this search. */
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#define KEYRING_SEARCH_LOOKUP_DIRECT 0x0000 /* Direct lookup by description. */
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#define KEYRING_SEARCH_LOOKUP_ITERATE 0x0001 /* Iterative search. */
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};
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/*
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* kernel managed key type definition
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*/
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struct key_type {
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/* name of the type */
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const char *name;
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/* default payload length for quota precalculation (optional)
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* - this can be used instead of calling key_payload_reserve(), that
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* function only needs to be called if the real datalen is different
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*/
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size_t def_datalen;
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/* vet a description */
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int (*vet_description)(const char *description);
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/* Preparse the data blob from userspace that is to be the payload,
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* generating a proposed description and payload that will be handed to
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* the instantiate() and update() ops.
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*/
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int (*preparse)(struct key_preparsed_payload *prep);
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/* Free a preparse data structure.
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*/
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void (*free_preparse)(struct key_preparsed_payload *prep);
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/* instantiate a key of this type
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* - this method should call key_payload_reserve() to determine if the
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* user's quota will hold the payload
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*/
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int (*instantiate)(struct key *key, struct key_preparsed_payload *prep);
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/* update a key of this type (optional)
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* - this method should call key_payload_reserve() to recalculate the
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* quota consumption
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* - the key must be locked against read when modifying
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*/
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int (*update)(struct key *key, struct key_preparsed_payload *prep);
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/* Preparse the data supplied to ->match() (optional). The
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* data to be preparsed can be found in match_data->raw_data.
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* The lookup type can also be set by this function.
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*/
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int (*match_preparse)(struct key_match_data *match_data);
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/* Free preparsed match data (optional). This should be supplied it
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* ->match_preparse() is supplied. */
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void (*match_free)(struct key_match_data *match_data);
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/* clear some of the data from a key on revokation (optional)
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* - the key's semaphore will be write-locked by the caller
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*/
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void (*revoke)(struct key *key);
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/* clear the data from a key (optional) */
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void (*destroy)(struct key *key);
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/* describe a key */
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void (*describe)(const struct key *key, struct seq_file *p);
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/* read a key's data (optional)
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* - permission checks will be done by the caller
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* - the key's semaphore will be readlocked by the caller
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* - should return the amount of data that could be read, no matter how
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* much is copied into the buffer
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* - shouldn't do the copy if the buffer is NULL
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*/
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long (*read)(const struct key *key, char __user *buffer, size_t buflen);
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/* handle request_key() for this type instead of invoking
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* /sbin/request-key (optional)
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* - key is the key to instantiate
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* - authkey is the authority to assume when instantiating this key
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* - op is the operation to be done, usually "create"
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* - the call must not return until the instantiation process has run
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* its course
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*/
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request_key_actor_t request_key;
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/* internal fields */
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struct list_head link; /* link in types list */
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struct lock_class_key lock_class; /* key->sem lock class */
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};
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extern struct key_type key_type_keyring;
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extern int register_key_type(struct key_type *ktype);
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extern void unregister_key_type(struct key_type *ktype);
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extern int key_payload_reserve(struct key *key, size_t datalen);
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extern int key_instantiate_and_link(struct key *key,
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const void *data,
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size_t datalen,
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struct key *keyring,
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struct key *instkey);
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extern int key_reject_and_link(struct key *key,
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unsigned timeout,
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unsigned error,
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struct key *keyring,
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struct key *instkey);
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extern void complete_request_key(struct key_construction *cons, int error);
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static inline int key_negate_and_link(struct key *key,
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unsigned timeout,
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struct key *keyring,
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struct key *instkey)
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{
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return key_reject_and_link(key, timeout, ENOKEY, keyring, instkey);
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}
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extern int generic_key_instantiate(struct key *key, struct key_preparsed_payload *prep);
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#endif /* CONFIG_KEYS */
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#endif /* _LINUX_KEY_TYPE_H */
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