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631cc66e DH |
1 | /* Public keys for module signature verification |
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/kernel.h> | |
13 | #include <linux/sched.h> | |
14 | #include <linux/cred.h> | |
15 | #include <linux/err.h> | |
16 | #include <keys/asymmetric-type.h> | |
17 | #include "module-internal.h" | |
18 | ||
19 | struct key *modsign_keyring; | |
20 | ||
21 | extern __initdata const u8 modsign_certificate_list[]; | |
22 | extern __initdata const u8 modsign_certificate_list_end[]; | |
23 | asm(".section .init.data,\"aw\"\n" | |
84ecfd15 | 24 | SYMBOL_PREFIX "modsign_certificate_list:\n" |
631cc66e DH |
25 | ".incbin \"signing_key.x509\"\n" |
26 | ".incbin \"extra_certificates\"\n" | |
84ecfd15 | 27 | SYMBOL_PREFIX "modsign_certificate_list_end:" |
631cc66e DH |
28 | ); |
29 | ||
30 | /* | |
31 | * We need to make sure ccache doesn't cache the .o file as it doesn't notice | |
32 | * if modsign.pub changes. | |
33 | */ | |
34 | static __initdata const char annoy_ccache[] = __TIME__ "foo"; | |
35 | ||
36 | /* | |
37 | * Load the compiled-in keys | |
38 | */ | |
39 | static __init int module_verify_init(void) | |
40 | { | |
41 | pr_notice("Initialise module verification\n"); | |
42 | ||
43 | modsign_keyring = key_alloc(&key_type_keyring, ".module_sign", | |
44 | KUIDT_INIT(0), KGIDT_INIT(0), | |
45 | current_cred(), | |
46 | (KEY_POS_ALL & ~KEY_POS_SETATTR) | | |
47 | KEY_USR_VIEW | KEY_USR_READ, | |
48 | KEY_ALLOC_NOT_IN_QUOTA); | |
49 | if (IS_ERR(modsign_keyring)) | |
50 | panic("Can't allocate module signing keyring\n"); | |
51 | ||
52 | if (key_instantiate_and_link(modsign_keyring, NULL, 0, NULL, NULL) < 0) | |
53 | panic("Can't instantiate module signing keyring\n"); | |
54 | ||
55 | return 0; | |
56 | } | |
57 | ||
58 | /* | |
59 | * Must be initialised before we try and load the keys into the keyring. | |
60 | */ | |
61 | device_initcall(module_verify_init); | |
62 | ||
63 | /* | |
64 | * Load the compiled-in keys | |
65 | */ | |
66 | static __init int load_module_signing_keys(void) | |
67 | { | |
68 | key_ref_t key; | |
69 | const u8 *p, *end; | |
70 | size_t plen; | |
71 | ||
72 | pr_notice("Loading module verification certificates\n"); | |
73 | ||
74 | end = modsign_certificate_list_end; | |
75 | p = modsign_certificate_list; | |
76 | while (p < end) { | |
77 | /* Each cert begins with an ASN.1 SEQUENCE tag and must be more | |
78 | * than 256 bytes in size. | |
79 | */ | |
80 | if (end - p < 4) | |
81 | goto dodgy_cert; | |
82 | if (p[0] != 0x30 && | |
83 | p[1] != 0x82) | |
84 | goto dodgy_cert; | |
85 | plen = (p[2] << 8) | p[3]; | |
86 | plen += 4; | |
87 | if (plen > end - p) | |
88 | goto dodgy_cert; | |
89 | ||
90 | key = key_create_or_update(make_key_ref(modsign_keyring, 1), | |
91 | "asymmetric", | |
92 | NULL, | |
93 | p, | |
94 | plen, | |
95 | (KEY_POS_ALL & ~KEY_POS_SETATTR) | | |
96 | KEY_USR_VIEW, | |
97 | KEY_ALLOC_NOT_IN_QUOTA); | |
98 | if (IS_ERR(key)) | |
99 | pr_err("MODSIGN: Problem loading in-kernel X.509 certificate (%ld)\n", | |
100 | PTR_ERR(key)); | |
101 | else | |
102 | pr_notice("MODSIGN: Loaded cert '%s'\n", | |
103 | key_ref_to_ptr(key)->description); | |
104 | p += plen; | |
105 | } | |
106 | ||
107 | return 0; | |
108 | ||
109 | dodgy_cert: | |
110 | pr_err("MODSIGN: Problem parsing in-kernel X.509 certificate list\n"); | |
111 | return 0; | |
112 | } | |
113 | late_initcall(load_module_signing_keys); |