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 7 int 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 54 dodgy_cert: 55 pr_err("Problem parsing in-kernel X.509 certificate list\n"); 56 return 0; 57 } 58