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KEYS: Add a lookup_restriction function for the asymmetric key type

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Look up asymmetric keyring restriction information using the key-type
lookup_restrict hook.

Signed-off-by: Mat Martineau <[email protected]>
This commit is contained in:
Mat Martineau 2016-05-06 14:25:39 -07:00
commit 97d3aa0f31
2 changed files with 79 additions and 8 deletions
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52
crypto/asymmetric_keys/asymmetric_type.c
View file

@ -17,6 +17,7 @@
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/ctype.h>
#include <keys/system_keyring.h>
#include "asymmetric_keys.h"
MODULE_LICENSE("GPL");
@ -451,15 +452,50 @@ static void asymmetric_key_destroy(struct key *key)
asymmetric_key_free_kids(kids);
}
static struct key_restriction *asymmetric_restriction_alloc(
key_restrict_link_func_t check,
struct key *key)
{
struct key_restriction *keyres =
kzalloc(sizeof(struct key_restriction), GFP_KERNEL);
if (!keyres)
return ERR_PTR(-ENOMEM);
keyres->check = check;
keyres->key = key;
keyres->keytype = &key_type_asymmetric;
return keyres;
}
/*
* look up keyring restrict functions for asymmetric keys
*/
static struct key_restriction *asymmetric_lookup_restriction(
const char *restriction)
{
if (strcmp("builtin_trusted", restriction) == 0)
return asymmetric_restriction_alloc(
restrict_link_by_builtin_trusted, NULL);
if (strcmp("builtin_and_secondary_trusted", restriction) == 0)
return asymmetric_restriction_alloc(
restrict_link_by_builtin_and_secondary_trusted, NULL);
return ERR_PTR(-EINVAL);
}
struct key_type key_type_asymmetric = {
.name = "asymmetric",
.preparse = asymmetric_key_preparse,
.free_preparse = asymmetric_key_free_preparse,
.instantiate = generic_key_instantiate,
.match_preparse = asymmetric_key_match_preparse,
.match_free = asymmetric_key_match_free,
.destroy = asymmetric_key_destroy,
.describe = asymmetric_key_describe,
.name = "asymmetric",
.preparse = asymmetric_key_preparse,
.free_preparse = asymmetric_key_free_preparse,
.instantiate = generic_key_instantiate,
.match_preparse = asymmetric_key_match_preparse,
.match_free = asymmetric_key_match_free,
.destroy = asymmetric_key_destroy,
.describe = asymmetric_key_describe,
.lookup_restriction = asymmetric_lookup_restriction,
};
EXPORT_SYMBOL_GPL(key_type_asymmetric);