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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> | |
21 | ||
22 | #include "integrity.h" | |
23 | ||
24 | static struct key *keyring[INTEGRITY_KEYRING_MAX]; | |
25 | ||
26 | static const char *keyring_name[INTEGRITY_KEYRING_MAX] = { | |
27 | "_evm", | |
28 | "_module", | |
7d2ce232 | 29 | #ifndef CONFIG_IMA_TRUSTED_KEYRING |
8607c501 | 30 | "_ima", |
7d2ce232 MZ |
31 | #else |
32 | ".ima", | |
33 | #endif | |
8607c501 DK |
34 | }; |
35 | ||
36 | int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, | |
089bc8e9 | 37 | const char *digest, int digestlen) |
8607c501 DK |
38 | { |
39 | if (id >= INTEGRITY_KEYRING_MAX) | |
40 | return -EINVAL; | |
41 | ||
42 | if (!keyring[id]) { | |
43 | keyring[id] = | |
34ef7bd3 | 44 | request_key(&key_type_keyring, keyring_name[id], NULL); |
8607c501 DK |
45 | if (IS_ERR(keyring[id])) { |
46 | int err = PTR_ERR(keyring[id]); | |
47 | pr_err("no %s keyring: %d\n", keyring_name[id], err); | |
48 | keyring[id] = NULL; | |
49 | return err; | |
50 | } | |
51 | } | |
52 | ||
b1aaab22 | 53 | switch (sig[1]) { |
e0751257 | 54 | case 1: |
b1aaab22 DK |
55 | /* v1 API expect signature without xattr type */ |
56 | return digsig_verify(keyring[id], sig + 1, siglen - 1, | |
e0751257 DK |
57 | digest, digestlen); |
58 | case 2: | |
59 | return asymmetric_verify(keyring[id], sig, siglen, | |
60 | digest, digestlen); | |
61 | } | |
62 | ||
63 | return -EOPNOTSUPP; | |
8607c501 | 64 | } |
7d2ce232 | 65 | |
d16a8585 | 66 | int __init integrity_init_keyring(const unsigned int id) |
7d2ce232 MZ |
67 | { |
68 | const struct cred *cred = current_cred(); | |
69 | int err = 0; | |
70 | ||
71 | keyring[id] = keyring_alloc(keyring_name[id], KUIDT_INIT(0), | |
72 | KGIDT_INIT(0), cred, | |
73 | ((KEY_POS_ALL & ~KEY_POS_SETATTR) | | |
74 | KEY_USR_VIEW | KEY_USR_READ | | |
75 | KEY_USR_WRITE | KEY_USR_SEARCH), | |
76 | KEY_ALLOC_NOT_IN_QUOTA, NULL); | |
77 | if (!IS_ERR(keyring[id])) | |
78 | set_bit(KEY_FLAG_TRUSTED_ONLY, &keyring[id]->flags); | |
79 | else { | |
80 | err = PTR_ERR(keyring[id]); | |
81 | pr_info("Can't allocate %s keyring (%d)\n", | |
82 | keyring_name[id], err); | |
83 | keyring[id] = NULL; | |
84 | } | |
85 | return err; | |
86 | } | |
65d543b2 DK |
87 | |
88 | int __init integrity_load_x509(const unsigned int id, char *path) | |
89 | { | |
90 | key_ref_t key; | |
91 | char *data; | |
92 | int rc; | |
93 | ||
94 | if (!keyring[id]) | |
95 | return -EINVAL; | |
96 | ||
97 | rc = integrity_read_file(path, &data); | |
98 | if (rc < 0) | |
99 | return rc; | |
100 | ||
101 | key = key_create_or_update(make_key_ref(keyring[id], 1), | |
102 | "asymmetric", | |
103 | NULL, | |
104 | data, | |
105 | rc, | |
106 | ((KEY_POS_ALL & ~KEY_POS_SETATTR) | | |
107 | KEY_USR_VIEW | KEY_USR_READ), | |
108 | KEY_ALLOC_NOT_IN_QUOTA | KEY_ALLOC_TRUSTED); | |
109 | if (IS_ERR(key)) { | |
110 | rc = PTR_ERR(key); | |
111 | pr_err("Problem loading X.509 certificate (%d): %s\n", | |
112 | rc, path); | |
113 | } else { | |
114 | pr_notice("Loaded X.509 cert '%s': %s\n", | |
115 | key_ref_to_ptr(key)->description, path); | |
116 | key_ref_put(key); | |
117 | } | |
118 | kfree(data); | |
119 | return 0; | |
120 | } |