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/kernel_read_file.h>
14 #include <linux/key-type.h>
15 #include <linux/digsig.h>
16 #include <linux/vmalloc.h>
17 #include <crypto/public_key.h>
18 #include <keys/system_keyring.h>
20 #include "integrity.h"
22 static struct key *keyring[INTEGRITY_KEYRING_MAX];
24 static const char * const keyring_name[INTEGRITY_KEYRING_MAX] = {
25 #ifndef CONFIG_INTEGRITY_TRUSTED_KEYRING
35 #ifdef CONFIG_IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY
36 #define restrict_link_to_ima restrict_link_by_builtin_and_secondary_trusted
38 #define restrict_link_to_ima restrict_link_by_builtin_trusted
41 static struct key *integrity_keyring_from_id(const unsigned int id)
43 if (id >= INTEGRITY_KEYRING_MAX)
44 return ERR_PTR(-EINVAL);
48 request_key(&key_type_keyring, keyring_name[id], NULL);
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);
60 int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
61 const char *digest, int digestlen)
68 keyring = integrity_keyring_from_id(id);
70 return PTR_ERR(keyring);
74 /* v1 API expect signature without xattr type */
75 return digsig_verify(keyring, sig + 1, siglen - 1, digest,
78 return asymmetric_verify(keyring, sig, siglen, digest,
85 int integrity_modsig_verify(const unsigned int id, const struct modsig *modsig)
89 keyring = integrity_keyring_from_id(id);
91 return PTR_ERR(keyring);
93 return ima_modsig_verify(keyring, modsig);
96 static int __init __integrity_init_keyring(const unsigned int id,
98 struct key_restriction *restriction)
100 const struct cred *cred = current_cred();
103 keyring[id] = keyring_alloc(keyring_name[id], KUIDT_INIT(0),
104 KGIDT_INIT(0), cred, perm,
105 KEY_ALLOC_NOT_IN_QUOTA, restriction, NULL);
106 if (IS_ERR(keyring[id])) {
107 err = PTR_ERR(keyring[id]);
108 pr_info("Can't allocate %s keyring (%d)\n",
109 keyring_name[id], err);
112 if (id == INTEGRITY_KEYRING_PLATFORM)
113 set_platform_trusted_keys(keyring[id]);
119 int __init integrity_init_keyring(const unsigned int id)
121 struct key_restriction *restriction;
124 perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW
125 | KEY_USR_READ | KEY_USR_SEARCH;
127 if (id == INTEGRITY_KEYRING_PLATFORM) {
132 if (!IS_ENABLED(CONFIG_INTEGRITY_TRUSTED_KEYRING))
135 restriction = kzalloc(sizeof(struct key_restriction), GFP_KERNEL);
139 restriction->check = restrict_link_to_ima;
140 perm |= KEY_USR_WRITE;
143 return __integrity_init_keyring(id, perm, restriction);
146 int __init integrity_add_key(const unsigned int id, const void *data,
147 off_t size, key_perm_t perm)
155 key = key_create_or_update(make_key_ref(keyring[id], 1), "asymmetric",
156 NULL, data, size, perm,
157 KEY_ALLOC_NOT_IN_QUOTA);
160 pr_err("Problem loading X.509 certificate %d\n", rc);
162 pr_notice("Loaded X.509 cert '%s'\n",
163 key_ref_to_ptr(key)->description);
171 int __init integrity_load_x509(const unsigned int id, const char *path)
178 rc = kernel_read_file_from_path(path, &data, INT_MAX, NULL,
179 READING_X509_CERTIFICATE);
181 pr_err("Unable to open file: %s (%d)", path, rc);
186 perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW | KEY_USR_READ;
188 pr_info("Loading X.509 certificate: %s\n", path);
189 rc = integrity_add_key(id, (const void *)data, size, perm);
195 int __init integrity_load_cert(const unsigned int id, const char *source,
196 const void *data, size_t len, key_perm_t perm)
201 pr_info("Loading X.509 certificate: %s\n", source);
202 return integrity_add_key(id, data, len, perm);