1// SPDX-License-Identifier: GPL-2.0-or-later
2
3#include <linux/kernel.h>
4#include <linux/key.h>
5#include <keys/asymmetric-type.h>
6
7int x509_load_certificate_list(const u8 cert_list[],
8			       const unsigned long list_size,
9			       const struct key *keyring)
10{
11	key_ref_t key;
12	const u8 *p, *end;
13	size_t plen;
14
15	p = cert_list;
16	end = p + list_size;
17	while (p < end) {
18		/* Each cert begins with an ASN.1 SEQUENCE tag and must be more
19		 * than 256 bytes in size.
20		 */
21		if (end - p < 4)
22			goto dodgy_cert;
23		if (p[0] != 0x30 &&
24		    p[1] != 0x82)
25			goto dodgy_cert;
26		plen = (p[2] << 8) | p[3];
27		plen += 4;
28		if (plen > end - p)
29			goto dodgy_cert;
30
31		key = key_create_or_update(make_key_ref(keyring, 1),
32					   "asymmetric",
33					   NULL,
34					   p,
35					   plen,
36					   ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
37					   KEY_USR_VIEW | KEY_USR_READ),
38					   KEY_ALLOC_NOT_IN_QUOTA |
39					   KEY_ALLOC_BUILT_IN |
40					   KEY_ALLOC_BYPASS_RESTRICTION);
41		if (IS_ERR(key)) {
42			pr_err("Problem loading in-kernel X.509 certificate (%ld)\n",
43			       PTR_ERR(key));
44		} else {
45			pr_notice("Loaded X.509 cert '%s'\n",
46				  key_ref_to_ptr(key)->description);
47			key_ref_put(key);
48		}
49		p += plen;
50	}
51
52	return 0;
53
54dodgy_cert:
55	pr_err("Problem parsing in-kernel X.509 certificate list\n");
56	return 0;
57}
58EXPORT_SYMBOL_GPL(x509_load_certificate_list);
59