1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2011 Intel Corporation
6 * Dmitry Kasatkin <dmitry.kasatkin@intel.com>
10 #include <linux/sched.h>
11 #include <linux/slab.h>
12 #include <linux/cred.h>
13 #include <linux/key-type.h>
14 #include <linux/digsig.h>
15 #include <linux/vmalloc.h>
16 #include <crypto/public_key.h>
17 #include <keys/system_keyring.h>
19 #include "integrity.h"
21 static struct key *keyring[INTEGRITY_KEYRING_MAX];
23 static const char * const keyring_name[INTEGRITY_KEYRING_MAX] = {
24 #ifndef CONFIG_INTEGRITY_TRUSTED_KEYRING
34 #ifdef CONFIG_IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY
35 #define restrict_link_to_ima restrict_link_by_builtin_and_secondary_trusted
37 #define restrict_link_to_ima restrict_link_by_builtin_trusted
40 static struct key *integrity_keyring_from_id(const unsigned int id)
42 if (id >= INTEGRITY_KEYRING_MAX)
43 return ERR_PTR(-EINVAL);
47 request_key(&key_type_keyring, keyring_name[id], NULL);
48 if (IS_ERR(keyring[id])) {
49 int err = PTR_ERR(keyring[id]);
50 pr_err("no %s keyring: %d\n", keyring_name[id], err);
59 int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
60 const char *digest, int digestlen)
67 keyring = integrity_keyring_from_id(id);
69 return PTR_ERR(keyring);
73 /* v1 API expect signature without xattr type */
74 return digsig_verify(keyring, sig + 1, siglen - 1, digest,
77 return asymmetric_verify(keyring, sig, siglen, digest,
84 int integrity_modsig_verify(const unsigned int id, const struct modsig *modsig)
88 keyring = integrity_keyring_from_id(id);
90 return PTR_ERR(keyring);
92 return ima_modsig_verify(keyring, modsig);
95 static int __init __integrity_init_keyring(const unsigned int id,
97 struct key_restriction *restriction)
99 const struct cred *cred = current_cred();
102 keyring[id] = keyring_alloc(keyring_name[id], KUIDT_INIT(0),
103 KGIDT_INIT(0), cred, perm,
104 KEY_ALLOC_NOT_IN_QUOTA, restriction, NULL);
105 if (IS_ERR(keyring[id])) {
106 err = PTR_ERR(keyring[id]);
107 pr_info("Can't allocate %s keyring (%d)\n",
108 keyring_name[id], err);
111 if (id == INTEGRITY_KEYRING_PLATFORM)
112 set_platform_trusted_keys(keyring[id]);
118 int __init integrity_init_keyring(const unsigned int id)
120 struct key_restriction *restriction;
123 perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW
124 | KEY_USR_READ | KEY_USR_SEARCH;
126 if (id == INTEGRITY_KEYRING_PLATFORM) {
131 if (!IS_ENABLED(CONFIG_INTEGRITY_TRUSTED_KEYRING))
134 restriction = kzalloc(sizeof(struct key_restriction), GFP_KERNEL);
138 restriction->check = restrict_link_to_ima;
139 perm |= KEY_USR_WRITE;
142 return __integrity_init_keyring(id, perm, restriction);
145 int __init integrity_add_key(const unsigned int id, const void *data,
146 off_t size, key_perm_t perm)
154 key = key_create_or_update(make_key_ref(keyring[id], 1), "asymmetric",
155 NULL, data, size, perm,
156 KEY_ALLOC_NOT_IN_QUOTA);
159 pr_err("Problem loading X.509 certificate %d\n", rc);
161 pr_notice("Loaded X.509 cert '%s'\n",
162 key_ref_to_ptr(key)->description);
170 int __init integrity_load_x509(const unsigned int id, const char *path)
177 rc = kernel_read_file_from_path(path, &data, &size, 0,
178 READING_X509_CERTIFICATE);
180 pr_err("Unable to open file: %s (%d)", path, rc);
184 perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW | KEY_USR_READ;
186 pr_info("Loading X.509 certificate: %s\n", path);
187 rc = integrity_add_key(id, (const void *)data, size, perm);
193 int __init integrity_load_cert(const unsigned int id, const char *source,
194 const void *data, size_t len, key_perm_t perm)
199 pr_info("Loading X.509 certificate: %s\n", source);
200 return integrity_add_key(id, data, len, perm);