59 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2 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 more19 * 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