linux_kernel/include/keys/system_keyring.h

/* System keyring containing trusted public keys.
 *
 * Copyright (C) 2013 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */

#ifndef _KEYS_SYSTEM_KEYRING_H
#define _KEYS_SYSTEM_KEYRING_H

#include <linux/key.h>

#ifdef CONFIG_SYSTEM_TRUSTED_KEYRING

extern int restrict_link_by_builtin_trusted(struct key *keyring,
					    const struct key_type *type,
					    const union key_payload *payload);

#else
#define restrict_link_by_builtin_trusted restrict_link_reject
#endif

#ifdef CONFIG_SECONDARY_TRUSTED_KEYRING
extern int restrict_link_by_builtin_and_secondary_trusted(
	struct key *keyring,
	const struct key_type *type,
	const union key_payload *payload);
#else
#define restrict_link_by_builtin_and_secondary_trusted restrict_link_by_builtin_trusted
#endif

#ifdef CONFIG_IMA_MOK_KEYRING
extern struct key *ima_mok_keyring;
extern struct key *ima_blacklist_keyring;

static inline struct key *get_ima_mok_keyring(void)
{
	return ima_mok_keyring;
}
static inline struct key *get_ima_blacklist_keyring(void)
{
	return ima_blacklist_keyring;
}
#else
static inline struct key *get_ima_mok_keyring(void)
{
	return NULL;
}
static inline struct key *get_ima_blacklist_keyring(void)
{
	return NULL;
}
#endif /* CONFIG_IMA_MOK_KEYRING */


#endif /* _KEYS_SYSTEM_KEYRING_H */