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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> | |
120f3b11 | 21 | #include <linux/vmalloc.h> |
a511e1af DH |
22 | #include <crypto/public_key.h> |
23 | #include <keys/system_keyring.h> | |
8607c501 DK |
24 | |
25 | #include "integrity.h" | |
26 | ||
27 | static struct key *keyring[INTEGRITY_KEYRING_MAX]; | |
28 | ||
29 | static const char *keyring_name[INTEGRITY_KEYRING_MAX] = { | |
f4dc3778 | 30 | #ifndef CONFIG_INTEGRITY_TRUSTED_KEYRING |
8607c501 | 31 | "_evm", |
8607c501 | 32 | "_ima", |
7d2ce232 | 33 | #else |
f4dc3778 | 34 | ".evm", |
7d2ce232 MZ |
35 | ".ima", |
36 | #endif | |
f4dc3778 | 37 | "_module", |
8607c501 DK |
38 | }; |
39 | ||
f4dc3778 DK |
40 | #ifdef CONFIG_INTEGRITY_TRUSTED_KEYRING |
41 | static bool init_keyring __initdata = true; | |
42 | #else | |
43 | static bool init_keyring __initdata; | |
44 | #endif | |
45 | ||
56104cf2 DH |
46 | #ifdef CONFIG_IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY |
47 | #define restrict_link_to_ima restrict_link_by_builtin_and_secondary_trusted | |
a511e1af | 48 | #else |
56104cf2 | 49 | #define restrict_link_to_ima restrict_link_by_builtin_trusted |
a511e1af DH |
50 | #endif |
51 | ||
8607c501 | 52 | int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, |
089bc8e9 | 53 | const char *digest, int digestlen) |
8607c501 | 54 | { |
b4bfec7f | 55 | if (id >= INTEGRITY_KEYRING_MAX || siglen < 2) |
8607c501 DK |
56 | return -EINVAL; |
57 | ||
58 | if (!keyring[id]) { | |
59 | keyring[id] = | |
34ef7bd3 | 60 | request_key(&key_type_keyring, keyring_name[id], NULL); |
8607c501 DK |
61 | if (IS_ERR(keyring[id])) { |
62 | int err = PTR_ERR(keyring[id]); | |
63 | pr_err("no %s keyring: %d\n", keyring_name[id], err); | |
64 | keyring[id] = NULL; | |
65 | return err; | |
66 | } | |
67 | } | |
68 | ||
b1aaab22 | 69 | switch (sig[1]) { |
e0751257 | 70 | case 1: |
b1aaab22 DK |
71 | /* v1 API expect signature without xattr type */ |
72 | return digsig_verify(keyring[id], sig + 1, siglen - 1, | |
e0751257 DK |
73 | digest, digestlen); |
74 | case 2: | |
75 | return asymmetric_verify(keyring[id], sig, siglen, | |
76 | digest, digestlen); | |
77 | } | |
78 | ||
79 | return -EOPNOTSUPP; | |
8607c501 | 80 | } |
7d2ce232 | 81 | |
d16a8585 | 82 | int __init integrity_init_keyring(const unsigned int id) |
7d2ce232 MZ |
83 | { |
84 | const struct cred *cred = current_cred(); | |
2b6aa412 | 85 | struct key_restriction *restriction; |
7d2ce232 MZ |
86 | int err = 0; |
87 | ||
f4dc3778 DK |
88 | if (!init_keyring) |
89 | return 0; | |
90 | ||
2b6aa412 MM |
91 | restriction = kzalloc(sizeof(struct key_restriction), GFP_KERNEL); |
92 | if (!restriction) | |
93 | return -ENOMEM; | |
94 | ||
95 | restriction->check = restrict_link_to_ima; | |
96 | ||
7d2ce232 MZ |
97 | keyring[id] = keyring_alloc(keyring_name[id], KUIDT_INIT(0), |
98 | KGIDT_INIT(0), cred, | |
99 | ((KEY_POS_ALL & ~KEY_POS_SETATTR) | | |
100 | KEY_USR_VIEW | KEY_USR_READ | | |
101 | KEY_USR_WRITE | KEY_USR_SEARCH), | |
5ac7eace | 102 | KEY_ALLOC_NOT_IN_QUOTA, |
2b6aa412 | 103 | restriction, NULL); |
5ac7eace | 104 | if (IS_ERR(keyring[id])) { |
7d2ce232 MZ |
105 | err = PTR_ERR(keyring[id]); |
106 | pr_info("Can't allocate %s keyring (%d)\n", | |
107 | keyring_name[id], err); | |
108 | keyring[id] = NULL; | |
109 | } | |
110 | return err; | |
111 | } | |
65d543b2 | 112 | |
9d03a721 | 113 | int __init integrity_load_x509(const unsigned int id, const char *path) |
65d543b2 DK |
114 | { |
115 | key_ref_t key; | |
a7d3d039 CH |
116 | void *data; |
117 | loff_t size; | |
65d543b2 DK |
118 | int rc; |
119 | ||
120 | if (!keyring[id]) | |
121 | return -EINVAL; | |
122 | ||
a7d3d039 CH |
123 | rc = kernel_read_file_from_path(path, &data, &size, 0, |
124 | READING_X509_CERTIFICATE); | |
125 | if (rc < 0) { | |
126 | pr_err("Unable to open file: %s (%d)", path, rc); | |
65d543b2 | 127 | return rc; |
a7d3d039 | 128 | } |
65d543b2 DK |
129 | |
130 | key = key_create_or_update(make_key_ref(keyring[id], 1), | |
131 | "asymmetric", | |
132 | NULL, | |
133 | data, | |
a7d3d039 | 134 | size, |
65d543b2 DK |
135 | ((KEY_POS_ALL & ~KEY_POS_SETATTR) | |
136 | KEY_USR_VIEW | KEY_USR_READ), | |
72e1eed8 | 137 | KEY_ALLOC_NOT_IN_QUOTA); |
65d543b2 DK |
138 | if (IS_ERR(key)) { |
139 | rc = PTR_ERR(key); | |
140 | pr_err("Problem loading X.509 certificate (%d): %s\n", | |
141 | rc, path); | |
142 | } else { | |
143 | pr_notice("Loaded X.509 cert '%s': %s\n", | |
144 | key_ref_to_ptr(key)->description, path); | |
145 | key_ref_put(key); | |
146 | } | |
a7d3d039 | 147 | vfree(data); |
65d543b2 DK |
148 | return 0; |
149 | } |