Commit | Line | Data |
---|---|---|
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 | ||
b2724d58 | 29 | static const char * const 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 | ||
56104cf2 DH |
40 | #ifdef CONFIG_IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY |
41 | #define restrict_link_to_ima restrict_link_by_builtin_and_secondary_trusted | |
a511e1af | 42 | #else |
56104cf2 | 43 | #define restrict_link_to_ima restrict_link_by_builtin_trusted |
a511e1af DH |
44 | #endif |
45 | ||
8607c501 | 46 | int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, |
089bc8e9 | 47 | const char *digest, int digestlen) |
8607c501 | 48 | { |
b4bfec7f | 49 | if (id >= INTEGRITY_KEYRING_MAX || siglen < 2) |
8607c501 DK |
50 | return -EINVAL; |
51 | ||
52 | if (!keyring[id]) { | |
53 | keyring[id] = | |
34ef7bd3 | 54 | request_key(&key_type_keyring, keyring_name[id], NULL); |
8607c501 DK |
55 | if (IS_ERR(keyring[id])) { |
56 | int err = PTR_ERR(keyring[id]); | |
57 | pr_err("no %s keyring: %d\n", keyring_name[id], err); | |
58 | keyring[id] = NULL; | |
59 | return err; | |
60 | } | |
61 | } | |
62 | ||
b1aaab22 | 63 | switch (sig[1]) { |
e0751257 | 64 | case 1: |
b1aaab22 DK |
65 | /* v1 API expect signature without xattr type */ |
66 | return digsig_verify(keyring[id], sig + 1, siglen - 1, | |
e0751257 DK |
67 | digest, digestlen); |
68 | case 2: | |
69 | return asymmetric_verify(keyring[id], sig, siglen, | |
70 | digest, digestlen); | |
71 | } | |
72 | ||
73 | return -EOPNOTSUPP; | |
8607c501 | 74 | } |
7d2ce232 | 75 | |
d16a8585 | 76 | int __init integrity_init_keyring(const unsigned int id) |
7d2ce232 MZ |
77 | { |
78 | const struct cred *cred = current_cred(); | |
2b6aa412 | 79 | struct key_restriction *restriction; |
7d2ce232 MZ |
80 | int err = 0; |
81 | ||
2ab5daf8 | 82 | if (!IS_ENABLED(CONFIG_INTEGRITY_TRUSTED_KEYRING)) |
f4dc3778 DK |
83 | return 0; |
84 | ||
2b6aa412 MM |
85 | restriction = kzalloc(sizeof(struct key_restriction), GFP_KERNEL); |
86 | if (!restriction) | |
87 | return -ENOMEM; | |
88 | ||
89 | restriction->check = restrict_link_to_ima; | |
90 | ||
7d2ce232 MZ |
91 | keyring[id] = keyring_alloc(keyring_name[id], KUIDT_INIT(0), |
92 | KGIDT_INIT(0), cred, | |
93 | ((KEY_POS_ALL & ~KEY_POS_SETATTR) | | |
94 | KEY_USR_VIEW | KEY_USR_READ | | |
95 | KEY_USR_WRITE | KEY_USR_SEARCH), | |
5ac7eace | 96 | KEY_ALLOC_NOT_IN_QUOTA, |
2b6aa412 | 97 | restriction, NULL); |
5ac7eace | 98 | if (IS_ERR(keyring[id])) { |
7d2ce232 MZ |
99 | err = PTR_ERR(keyring[id]); |
100 | pr_info("Can't allocate %s keyring (%d)\n", | |
101 | keyring_name[id], err); | |
102 | keyring[id] = NULL; | |
103 | } | |
104 | return err; | |
105 | } | |
65d543b2 | 106 | |
9d03a721 | 107 | int __init integrity_load_x509(const unsigned int id, const char *path) |
65d543b2 DK |
108 | { |
109 | key_ref_t key; | |
a7d3d039 CH |
110 | void *data; |
111 | loff_t size; | |
65d543b2 DK |
112 | int rc; |
113 | ||
114 | if (!keyring[id]) | |
115 | return -EINVAL; | |
116 | ||
a7d3d039 CH |
117 | rc = kernel_read_file_from_path(path, &data, &size, 0, |
118 | READING_X509_CERTIFICATE); | |
119 | if (rc < 0) { | |
120 | pr_err("Unable to open file: %s (%d)", path, rc); | |
65d543b2 | 121 | return rc; |
a7d3d039 | 122 | } |
65d543b2 DK |
123 | |
124 | key = key_create_or_update(make_key_ref(keyring[id], 1), | |
125 | "asymmetric", | |
126 | NULL, | |
127 | data, | |
a7d3d039 | 128 | size, |
65d543b2 DK |
129 | ((KEY_POS_ALL & ~KEY_POS_SETATTR) | |
130 | KEY_USR_VIEW | KEY_USR_READ), | |
72e1eed8 | 131 | KEY_ALLOC_NOT_IN_QUOTA); |
65d543b2 DK |
132 | if (IS_ERR(key)) { |
133 | rc = PTR_ERR(key); | |
134 | pr_err("Problem loading X.509 certificate (%d): %s\n", | |
135 | rc, path); | |
136 | } else { | |
137 | pr_notice("Loaded X.509 cert '%s': %s\n", | |
138 | key_ref_to_ptr(key)->description, path); | |
139 | key_ref_put(key); | |
140 | } | |
a7d3d039 | 141 | vfree(data); |
65d543b2 DK |
142 | return 0; |
143 | } |