path: root/security/integrity/ima/ima_mok.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2015 Juniper Networks, Inc.
 *
 * Author:
 * Petko Manolov <petko.manolov@konsulko.com>
 */

#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/cred.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <keys/system_keyring.h>


static struct key_acl integrity_blacklist_keyring_acl = {
	.usage	= REFCOUNT_INIT(1),
	.nr_ace	= 2,
	.aces = {
		KEY_POSSESSOR_ACE(KEY_ACE_SEARCH | KEY_ACE_WRITE),
		KEY_OWNER_ACE(KEY_ACE_VIEW | KEY_ACE_READ | KEY_ACE_WRITE | KEY_ACE_SEARCH),
	}
};

struct key *ima_blacklist_keyring;

/*
 * Allocate the IMA blacklist keyring
 */
__init int ima_mok_init(void)
{
	struct key_restriction *restriction;

	pr_notice("Allocating IMA blacklist keyring.\n");

	restriction = kzalloc(sizeof(struct key_restriction), GFP_KERNEL);
	if (!restriction)
		panic("Can't allocate IMA blacklist restriction.");

	restriction->check = restrict_link_by_builtin_trusted;

	ima_blacklist_keyring = keyring_alloc(".ima_blacklist",
				KUIDT_INIT(0), KGIDT_INIT(0), current_cred(),
			        &integrity_blacklist_keyring_acl,
				KEY_ALLOC_NOT_IN_QUOTA,
				restriction, NULL);

	if (IS_ERR(ima_blacklist_keyring))
		panic("Can't allocate IMA blacklist keyring.");

	set_bit(KEY_FLAG_KEEP, &ima_blacklist_keyring->flags);
	return 0;
}
device_initcall(ima_mok_init);