1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2011 Intel Corporation
6 * Dmitry Kasatkin <dmitry.kasatkin@intel.com>
9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11 #include <linux/err.h>
12 #include <linux/sched.h>
13 #include <linux/slab.h>
14 #include <linux/cred.h>
15 #include <linux/key-type.h>
16 #include <linux/digsig.h>
17 #include <linux/vmalloc.h>
18 #include <crypto/public_key.h>
19 #include <keys/system_keyring.h>
21 #include "integrity.h"
23 static struct key *keyring[INTEGRITY_KEYRING_MAX];
25 static const char * const keyring_name[INTEGRITY_KEYRING_MAX] = {
26 #ifndef CONFIG_INTEGRITY_TRUSTED_KEYRING
36 #ifdef CONFIG_IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY
37 #define restrict_link_to_ima restrict_link_by_builtin_and_secondary_trusted
39 #define restrict_link_to_ima restrict_link_by_builtin_trusted
42 int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
43 const char *digest, int digestlen)
45 if (id >= INTEGRITY_KEYRING_MAX || siglen < 2)
50 request_key(&key_type_keyring, keyring_name[id], NULL);
51 if (IS_ERR(keyring[id])) {
52 int err = PTR_ERR(keyring[id]);
53 pr_err("no %s keyring: %d\n", keyring_name[id], err);
61 /* v1 API expect signature without xattr type */
62 return digsig_verify(keyring[id], sig + 1, siglen - 1,
65 return asymmetric_verify(keyring[id], sig, siglen,
72 static int __init __integrity_init_keyring(const unsigned int id,
74 struct key_restriction *restriction)
76 const struct cred *cred = current_cred();
79 keyring[id] = keyring_alloc(keyring_name[id], KUIDT_INIT(0),
80 KGIDT_INIT(0), cred, perm,
81 KEY_ALLOC_NOT_IN_QUOTA, restriction, NULL);
82 if (IS_ERR(keyring[id])) {
83 err = PTR_ERR(keyring[id]);
84 pr_info("Can't allocate %s keyring (%d)\n",
85 keyring_name[id], err);
88 if (id == INTEGRITY_KEYRING_PLATFORM)
89 set_platform_trusted_keys(keyring[id]);
95 int __init integrity_init_keyring(const unsigned int id)
97 struct key_restriction *restriction;
100 perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW
101 | KEY_USR_READ | KEY_USR_SEARCH;
103 if (id == INTEGRITY_KEYRING_PLATFORM) {
108 if (!IS_ENABLED(CONFIG_INTEGRITY_TRUSTED_KEYRING))
111 restriction = kzalloc(sizeof(struct key_restriction), GFP_KERNEL);
115 restriction->check = restrict_link_to_ima;
116 perm |= KEY_USR_WRITE;
119 return __integrity_init_keyring(id, perm, restriction);
122 int __init integrity_add_key(const unsigned int id, const void *data,
123 off_t size, key_perm_t perm)
131 key = key_create_or_update(make_key_ref(keyring[id], 1), "asymmetric",
132 NULL, data, size, perm,
133 KEY_ALLOC_NOT_IN_QUOTA);
136 pr_err("Problem loading X.509 certificate %d\n", rc);
138 pr_notice("Loaded X.509 cert '%s'\n",
139 key_ref_to_ptr(key)->description);
147 int __init integrity_load_x509(const unsigned int id, const char *path)
154 rc = kernel_read_file_from_path(path, &data, &size, 0,
155 READING_X509_CERTIFICATE);
157 pr_err("Unable to open file: %s (%d)", path, rc);
161 perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW | KEY_USR_READ;
163 pr_info("Loading X.509 certificate: %s\n", path);
164 rc = integrity_add_key(id, (const void *)data, size, perm);
170 int __init integrity_load_cert(const unsigned int id, const char *source,
171 const void *data, size_t len, key_perm_t perm)
176 pr_info("Loading X.509 certificate: %s\n", source);
177 return integrity_add_key(id, data, len, perm);