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b886d83c | 1 | // SPDX-License-Identifier: GPL-2.0-only |
8607c501 DK |
2 | /* |
3 | * Copyright (C) 2011 Intel Corporation | |
4 | * | |
5 | * Author: | |
6 | * Dmitry Kasatkin <dmitry.kasatkin@intel.com> | |
8607c501 DK |
7 | */ |
8 | ||
8607c501 | 9 | #include <linux/err.h> |
7d2ce232 | 10 | #include <linux/sched.h> |
65d543b2 | 11 | #include <linux/slab.h> |
7d2ce232 | 12 | #include <linux/cred.h> |
b89999d0 | 13 | #include <linux/kernel_read_file.h> |
8607c501 DK |
14 | #include <linux/key-type.h> |
15 | #include <linux/digsig.h> | |
120f3b11 | 16 | #include <linux/vmalloc.h> |
a511e1af DH |
17 | #include <crypto/public_key.h> |
18 | #include <keys/system_keyring.h> | |
8607c501 DK |
19 | |
20 | #include "integrity.h" | |
21 | ||
22 | static struct key *keyring[INTEGRITY_KEYRING_MAX]; | |
23 | ||
b2724d58 | 24 | static const char * const keyring_name[INTEGRITY_KEYRING_MAX] = { |
f4dc3778 | 25 | #ifndef CONFIG_INTEGRITY_TRUSTED_KEYRING |
8607c501 | 26 | "_evm", |
8607c501 | 27 | "_ima", |
7d2ce232 | 28 | #else |
f4dc3778 | 29 | ".evm", |
7d2ce232 MZ |
30 | ".ima", |
31 | #endif | |
9dc92c45 | 32 | ".platform", |
8607c501 DK |
33 | }; |
34 | ||
56104cf2 DH |
35 | #ifdef CONFIG_IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY |
36 | #define restrict_link_to_ima restrict_link_by_builtin_and_secondary_trusted | |
a511e1af | 37 | #else |
56104cf2 | 38 | #define restrict_link_to_ima restrict_link_by_builtin_trusted |
a511e1af DH |
39 | #endif |
40 | ||
39b07096 | 41 | static struct key *integrity_keyring_from_id(const unsigned int id) |
8607c501 | 42 | { |
39b07096 TJB |
43 | if (id >= INTEGRITY_KEYRING_MAX) |
44 | return ERR_PTR(-EINVAL); | |
8607c501 DK |
45 | |
46 | if (!keyring[id]) { | |
47 | keyring[id] = | |
028db3e2 | 48 | request_key(&key_type_keyring, keyring_name[id], NULL); |
8607c501 DK |
49 | if (IS_ERR(keyring[id])) { |
50 | int err = PTR_ERR(keyring[id]); | |
51 | pr_err("no %s keyring: %d\n", keyring_name[id], err); | |
52 | keyring[id] = NULL; | |
39b07096 | 53 | return ERR_PTR(err); |
8607c501 DK |
54 | } |
55 | } | |
56 | ||
39b07096 TJB |
57 | return keyring[id]; |
58 | } | |
59 | ||
60 | int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, | |
61 | const char *digest, int digestlen) | |
62 | { | |
63 | struct key *keyring; | |
64 | ||
65 | if (siglen < 2) | |
66 | return -EINVAL; | |
67 | ||
68 | keyring = integrity_keyring_from_id(id); | |
69 | if (IS_ERR(keyring)) | |
70 | return PTR_ERR(keyring); | |
71 | ||
b1aaab22 | 72 | switch (sig[1]) { |
e0751257 | 73 | case 1: |
b1aaab22 | 74 | /* v1 API expect signature without xattr type */ |
39b07096 TJB |
75 | return digsig_verify(keyring, sig + 1, siglen - 1, digest, |
76 | digestlen); | |
e0751257 | 77 | case 2: |
39b07096 TJB |
78 | return asymmetric_verify(keyring, sig, siglen, digest, |
79 | digestlen); | |
e0751257 DK |
80 | } |
81 | ||
82 | return -EOPNOTSUPP; | |
8607c501 | 83 | } |
7d2ce232 | 84 | |
39b07096 TJB |
85 | int integrity_modsig_verify(const unsigned int id, const struct modsig *modsig) |
86 | { | |
87 | struct key *keyring; | |
88 | ||
89 | keyring = integrity_keyring_from_id(id); | |
90 | if (IS_ERR(keyring)) | |
91 | return PTR_ERR(keyring); | |
92 | ||
93 | return ima_modsig_verify(keyring, modsig); | |
94 | } | |
95 | ||
8c655784 | 96 | static int __init __integrity_init_keyring(const unsigned int id, |
028db3e2 | 97 | key_perm_t perm, |
8c655784 | 98 | struct key_restriction *restriction) |
7d2ce232 MZ |
99 | { |
100 | const struct cred *cred = current_cred(); | |
101 | int err = 0; | |
102 | ||
103 | keyring[id] = keyring_alloc(keyring_name[id], KUIDT_INIT(0), | |
028db3e2 | 104 | KGIDT_INIT(0), cred, perm, |
60740acc | 105 | KEY_ALLOC_NOT_IN_QUOTA, restriction, NULL); |
5ac7eace | 106 | if (IS_ERR(keyring[id])) { |
7d2ce232 MZ |
107 | err = PTR_ERR(keyring[id]); |
108 | pr_info("Can't allocate %s keyring (%d)\n", | |
109 | keyring_name[id], err); | |
110 | keyring[id] = NULL; | |
219a3e86 KS |
111 | } else { |
112 | if (id == INTEGRITY_KEYRING_PLATFORM) | |
113 | set_platform_trusted_keys(keyring[id]); | |
7d2ce232 | 114 | } |
9dc92c45 | 115 | |
7d2ce232 MZ |
116 | return err; |
117 | } | |
65d543b2 | 118 | |
9dc92c45 NJ |
119 | int __init integrity_init_keyring(const unsigned int id) |
120 | { | |
121 | struct key_restriction *restriction; | |
028db3e2 LT |
122 | key_perm_t perm; |
123 | ||
124 | perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW | |
125 | | KEY_USR_READ | KEY_USR_SEARCH; | |
9dc92c45 NJ |
126 | |
127 | if (id == INTEGRITY_KEYRING_PLATFORM) { | |
128 | restriction = NULL; | |
129 | goto out; | |
130 | } | |
131 | ||
132 | if (!IS_ENABLED(CONFIG_INTEGRITY_TRUSTED_KEYRING)) | |
133 | return 0; | |
134 | ||
135 | restriction = kzalloc(sizeof(struct key_restriction), GFP_KERNEL); | |
136 | if (!restriction) | |
137 | return -ENOMEM; | |
138 | ||
139 | restriction->check = restrict_link_to_ima; | |
028db3e2 | 140 | perm |= KEY_USR_WRITE; |
9dc92c45 NJ |
141 | |
142 | out: | |
028db3e2 | 143 | return __integrity_init_keyring(id, perm, restriction); |
9dc92c45 NJ |
144 | } |
145 | ||
028db3e2 LT |
146 | int __init integrity_add_key(const unsigned int id, const void *data, |
147 | off_t size, key_perm_t perm) | |
65d543b2 DK |
148 | { |
149 | key_ref_t key; | |
60740acc | 150 | int rc = 0; |
65d543b2 DK |
151 | |
152 | if (!keyring[id]) | |
153 | return -EINVAL; | |
154 | ||
60740acc | 155 | key = key_create_or_update(make_key_ref(keyring[id], 1), "asymmetric", |
028db3e2 | 156 | NULL, data, size, perm, |
60740acc NJ |
157 | KEY_ALLOC_NOT_IN_QUOTA); |
158 | if (IS_ERR(key)) { | |
159 | rc = PTR_ERR(key); | |
160 | pr_err("Problem loading X.509 certificate %d\n", rc); | |
161 | } else { | |
162 | pr_notice("Loaded X.509 cert '%s'\n", | |
163 | key_ref_to_ptr(key)->description); | |
164 | key_ref_put(key); | |
165 | } | |
166 | ||
167 | return rc; | |
168 | ||
169 | } | |
170 | ||
171 | int __init integrity_load_x509(const unsigned int id, const char *path) | |
172 | { | |
c307459b | 173 | void *data = NULL; |
f7a4f689 | 174 | size_t size; |
60740acc | 175 | int rc; |
028db3e2 | 176 | key_perm_t perm; |
60740acc | 177 | |
0fa8e084 | 178 | rc = kernel_read_file_from_path(path, 0, &data, INT_MAX, NULL, |
a7d3d039 CH |
179 | READING_X509_CERTIFICATE); |
180 | if (rc < 0) { | |
63c8787a | 181 | pr_warn("Unable to open file: %s (%d)", path, rc); |
65d543b2 | 182 | return rc; |
a7d3d039 | 183 | } |
f7a4f689 | 184 | size = rc; |
65d543b2 | 185 | |
028db3e2 LT |
186 | perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW | KEY_USR_READ; |
187 | ||
60740acc | 188 | pr_info("Loading X.509 certificate: %s\n", path); |
028db3e2 | 189 | rc = integrity_add_key(id, (const void *)data, size, perm); |
60740acc | 190 | |
a7d3d039 | 191 | vfree(data); |
60740acc NJ |
192 | return rc; |
193 | } | |
194 | ||
195 | int __init integrity_load_cert(const unsigned int id, const char *source, | |
028db3e2 | 196 | const void *data, size_t len, key_perm_t perm) |
60740acc NJ |
197 | { |
198 | if (!data) | |
199 | return -EINVAL; | |
200 | ||
201 | pr_info("Loading X.509 certificate: %s\n", source); | |
028db3e2 | 202 | return integrity_add_key(id, data, len, perm); |
65d543b2 | 203 | } |