1 /* System trusted keyring for trusted public keys
2 *
3 * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
10 */
11
12 #include <linux/export.h>
13 #include <linux/kernel.h>
14 #include <linux/sched.h>
15 #include <linux/cred.h>
16 #include <linux/err.h>
17 #include <keys/asymmetric-type.h>
18 #include <keys/system_keyring.h>
19 #include "module-internal.h"
20
21 struct key *system_trusted_keyring;
22 EXPORT_SYMBOL_GPL(system_trusted_keyring);
23
24 extern __initconst const u8 system_certificate_list[];
25 extern __initconst const u8 system_certificate_list_end[];
26
27 /*
28 * Load the compiled-in keys
29 */
system_trusted_keyring_init(void)30 static __init int system_trusted_keyring_init(void)
31 {
32 pr_notice("Initialise system trusted keyring\n");
33
34 system_trusted_keyring =
35 keyring_alloc(".system_keyring",
36 KUIDT_INIT(0), KGIDT_INIT(0), current_cred(),
37 ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
38 KEY_USR_VIEW | KEY_USR_READ),
39 KEY_ALLOC_NOT_IN_QUOTA, NULL);
40 if (IS_ERR(system_trusted_keyring))
41 panic("Can't allocate system trusted keyring\n");
42
43 return 0;
44 }
45
46 /*
47 * Must be initialised before we try and load the keys into the keyring.
48 */
49 device_initcall(system_trusted_keyring_init);
50
51 /*
52 * Load the compiled-in list of X.509 certificates.
53 */
load_system_certificate_list(void)54 static __init int load_system_certificate_list(void)
55 {
56 key_ref_t key;
57 const u8 *p, *end;
58 size_t plen;
59
60 pr_notice("Loading compiled-in X.509 certificates\n");
61
62 end = system_certificate_list_end;
63 p = system_certificate_list;
64 while (p < end) {
65 /* Each cert begins with an ASN.1 SEQUENCE tag and must be more
66 * than 256 bytes in size.
67 */
68 if (end - p < 4)
69 goto dodgy_cert;
70 if (p[0] != 0x30 &&
71 p[1] != 0x82)
72 goto dodgy_cert;
73 plen = (p[2] << 8) | p[3];
74 plen += 4;
75 if (plen > end - p)
76 goto dodgy_cert;
77
78 key = key_create_or_update(make_key_ref(system_trusted_keyring, 1),
79 "asymmetric",
80 NULL,
81 p,
82 plen,
83 (KEY_POS_ALL & ~KEY_POS_SETATTR) |
84 KEY_USR_VIEW,
85 KEY_ALLOC_NOT_IN_QUOTA);
86 if (IS_ERR(key)) {
87 pr_err("Problem loading in-kernel X.509 certificate (%ld)\n",
88 PTR_ERR(key));
89 } else {
90 pr_notice("Loaded X.509 cert '%s'\n",
91 key_ref_to_ptr(key)->description);
92 key_ref_put(key);
93 }
94 p += plen;
95 }
96
97 return 0;
98
99 dodgy_cert:
100 pr_err("Problem parsing in-kernel X.509 certificate list\n");
101 return 0;
102 }
103 late_initcall(load_system_certificate_list);
104