2 * Copyright (C) 2011 Intel Corporation
5 * Dmitry Kasatkin <dmitry.kasatkin@intel.com>
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.
13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15 #include <linux/err.h>
16 #include <linux/sched.h>
17 #include <linux/slab.h>
18 #include <linux/cred.h>
19 #include <linux/key-type.h>
20 #include <linux/digsig.h>
21 #include <linux/vmalloc.h>
22 #include <crypto/public_key.h>
23 #include <keys/system_keyring.h>
25 #include "integrity.h"
27 static struct key *keyring[INTEGRITY_KEYRING_MAX];
29 static const char * const keyring_name[INTEGRITY_KEYRING_MAX] = {
30 #ifndef CONFIG_INTEGRITY_TRUSTED_KEYRING
40 #ifdef CONFIG_IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY
41 #define restrict_link_to_ima restrict_link_by_builtin_and_secondary_trusted
43 #define restrict_link_to_ima restrict_link_by_builtin_trusted
46 int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
47 const char *digest, int digestlen)
49 if (id >= INTEGRITY_KEYRING_MAX || siglen < 2)
54 request_key(&key_type_keyring, keyring_name[id], NULL);
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);
65 /* v1 API expect signature without xattr type */
66 return digsig_verify(keyring[id], sig + 1, siglen - 1,
69 return asymmetric_verify(keyring[id], sig, siglen,
76 int __init integrity_init_keyring(const unsigned int id)
78 const struct cred *cred = current_cred();
79 struct key_restriction *restriction;
82 if (!IS_ENABLED(CONFIG_INTEGRITY_TRUSTED_KEYRING))
85 restriction = kzalloc(sizeof(struct key_restriction), GFP_KERNEL);
89 restriction->check = restrict_link_to_ima;
91 keyring[id] = keyring_alloc(keyring_name[id], KUIDT_INIT(0),
93 ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
94 KEY_USR_VIEW | KEY_USR_READ |
95 KEY_USR_WRITE | KEY_USR_SEARCH),
96 KEY_ALLOC_NOT_IN_QUOTA,
98 if (IS_ERR(keyring[id])) {
99 err = PTR_ERR(keyring[id]);
100 pr_info("Can't allocate %s keyring (%d)\n",
101 keyring_name[id], err);
107 int __init integrity_load_x509(const unsigned int id, const char *path)
117 rc = kernel_read_file_from_path(path, &data, &size, 0,
118 READING_X509_CERTIFICATE);
120 pr_err("Unable to open file: %s (%d)", path, rc);
124 key = key_create_or_update(make_key_ref(keyring[id], 1),
129 ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
130 KEY_USR_VIEW | KEY_USR_READ),
131 KEY_ALLOC_NOT_IN_QUOTA);
134 pr_err("Problem loading X.509 certificate (%d): %s\n",
137 pr_notice("Loaded X.509 cert '%s': %s\n",
138 key_ref_to_ptr(key)->description, path);