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8607c501 DK |
1 | /* |
2 | * Copyright (C) 2011 Intel Corporation | |
3 | * | |
4 | * Author: | |
5 | * Dmitry Kasatkin <dmitry.kasatkin@intel.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation, version 2 of the License. | |
10 | * | |
11 | */ | |
12 | ||
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
14 | ||
15 | #include <linux/err.h> | |
7d2ce232 | 16 | #include <linux/sched.h> |
65d543b2 | 17 | #include <linux/slab.h> |
7d2ce232 | 18 | #include <linux/cred.h> |
8607c501 DK |
19 | #include <linux/key-type.h> |
20 | #include <linux/digsig.h> | |
a511e1af DH |
21 | #include <crypto/public_key.h> |
22 | #include <keys/system_keyring.h> | |
8607c501 DK |
23 | |
24 | #include "integrity.h" | |
25 | ||
26 | static struct key *keyring[INTEGRITY_KEYRING_MAX]; | |
27 | ||
28 | static const char *keyring_name[INTEGRITY_KEYRING_MAX] = { | |
f4dc3778 | 29 | #ifndef CONFIG_INTEGRITY_TRUSTED_KEYRING |
8607c501 | 30 | "_evm", |
8607c501 | 31 | "_ima", |
7d2ce232 | 32 | #else |
f4dc3778 | 33 | ".evm", |
7d2ce232 MZ |
34 | ".ima", |
35 | #endif | |
f4dc3778 | 36 | "_module", |
8607c501 DK |
37 | }; |
38 | ||
f4dc3778 DK |
39 | #ifdef CONFIG_INTEGRITY_TRUSTED_KEYRING |
40 | static bool init_keyring __initdata = true; | |
41 | #else | |
42 | static bool init_keyring __initdata; | |
43 | #endif | |
44 | ||
56104cf2 DH |
45 | #ifdef CONFIG_IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY |
46 | #define restrict_link_to_ima restrict_link_by_builtin_and_secondary_trusted | |
a511e1af | 47 | #else |
56104cf2 | 48 | #define restrict_link_to_ima restrict_link_by_builtin_trusted |
a511e1af DH |
49 | #endif |
50 | ||
8607c501 | 51 | int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, |
089bc8e9 | 52 | const char *digest, int digestlen) |
8607c501 | 53 | { |
b4bfec7f | 54 | if (id >= INTEGRITY_KEYRING_MAX || siglen < 2) |
8607c501 DK |
55 | return -EINVAL; |
56 | ||
57 | if (!keyring[id]) { | |
58 | keyring[id] = | |
34ef7bd3 | 59 | request_key(&key_type_keyring, keyring_name[id], NULL); |
8607c501 DK |
60 | if (IS_ERR(keyring[id])) { |
61 | int err = PTR_ERR(keyring[id]); | |
62 | pr_err("no %s keyring: %d\n", keyring_name[id], err); | |
63 | keyring[id] = NULL; | |
64 | return err; | |
65 | } | |
66 | } | |
67 | ||
b1aaab22 | 68 | switch (sig[1]) { |
e0751257 | 69 | case 1: |
b1aaab22 DK |
70 | /* v1 API expect signature without xattr type */ |
71 | return digsig_verify(keyring[id], sig + 1, siglen - 1, | |
e0751257 DK |
72 | digest, digestlen); |
73 | case 2: | |
74 | return asymmetric_verify(keyring[id], sig, siglen, | |
75 | digest, digestlen); | |
76 | } | |
77 | ||
78 | return -EOPNOTSUPP; | |
8607c501 | 79 | } |
7d2ce232 | 80 | |
d16a8585 | 81 | int __init integrity_init_keyring(const unsigned int id) |
7d2ce232 MZ |
82 | { |
83 | const struct cred *cred = current_cred(); | |
2b6aa412 | 84 | struct key_restriction *restriction; |
7d2ce232 MZ |
85 | int err = 0; |
86 | ||
f4dc3778 DK |
87 | if (!init_keyring) |
88 | return 0; | |
89 | ||
2b6aa412 MM |
90 | restriction = kzalloc(sizeof(struct key_restriction), GFP_KERNEL); |
91 | if (!restriction) | |
92 | return -ENOMEM; | |
93 | ||
94 | restriction->check = restrict_link_to_ima; | |
95 | ||
7d2ce232 MZ |
96 | keyring[id] = keyring_alloc(keyring_name[id], KUIDT_INIT(0), |
97 | KGIDT_INIT(0), cred, | |
98 | ((KEY_POS_ALL & ~KEY_POS_SETATTR) | | |
99 | KEY_USR_VIEW | KEY_USR_READ | | |
100 | KEY_USR_WRITE | KEY_USR_SEARCH), | |
5ac7eace | 101 | KEY_ALLOC_NOT_IN_QUOTA, |
2b6aa412 | 102 | restriction, NULL); |
5ac7eace | 103 | if (IS_ERR(keyring[id])) { |
7d2ce232 MZ |
104 | err = PTR_ERR(keyring[id]); |
105 | pr_info("Can't allocate %s keyring (%d)\n", | |
106 | keyring_name[id], err); | |
107 | keyring[id] = NULL; | |
108 | } | |
109 | return err; | |
110 | } | |
65d543b2 | 111 | |
9d03a721 | 112 | int __init integrity_load_x509(const unsigned int id, const char *path) |
65d543b2 DK |
113 | { |
114 | key_ref_t key; | |
115 | char *data; | |
116 | int rc; | |
117 | ||
118 | if (!keyring[id]) | |
119 | return -EINVAL; | |
120 | ||
121 | rc = integrity_read_file(path, &data); | |
122 | if (rc < 0) | |
123 | return rc; | |
124 | ||
125 | key = key_create_or_update(make_key_ref(keyring[id], 1), | |
126 | "asymmetric", | |
127 | NULL, | |
128 | data, | |
129 | rc, | |
130 | ((KEY_POS_ALL & ~KEY_POS_SETATTR) | | |
131 | KEY_USR_VIEW | KEY_USR_READ), | |
72e1eed8 | 132 | KEY_ALLOC_NOT_IN_QUOTA); |
65d543b2 DK |
133 | if (IS_ERR(key)) { |
134 | rc = PTR_ERR(key); | |
135 | pr_err("Problem loading X.509 certificate (%d): %s\n", | |
136 | rc, path); | |
137 | } else { | |
138 | pr_notice("Loaded X.509 cert '%s': %s\n", | |
139 | key_ref_to_ptr(key)->description, path); | |
140 | key_ref_put(key); | |
141 | } | |
142 | kfree(data); | |
143 | return 0; | |
144 | } |