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 static int __integrity_init_keyring(const unsigned int id, key_perm_t perm,
77 struct key_restriction *restriction)
79 const struct cred *cred = current_cred();
82 keyring[id] = keyring_alloc(keyring_name[id], KUIDT_INIT(0),
83 KGIDT_INIT(0), cred, perm,
84 KEY_ALLOC_NOT_IN_QUOTA, restriction, NULL);
85 if (IS_ERR(keyring[id])) {
86 err = PTR_ERR(keyring[id]);
87 pr_info("Can't allocate %s keyring (%d)\n",
88 keyring_name[id], err);
91 if (id == INTEGRITY_KEYRING_PLATFORM)
92 set_platform_trusted_keys(keyring[id]);
98 int __init integrity_init_keyring(const unsigned int id)
100 struct key_restriction *restriction;
103 perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW
104 | KEY_USR_READ | KEY_USR_SEARCH;
106 if (id == INTEGRITY_KEYRING_PLATFORM) {
111 if (!IS_ENABLED(CONFIG_INTEGRITY_TRUSTED_KEYRING))
114 restriction = kzalloc(sizeof(struct key_restriction), GFP_KERNEL);
118 restriction->check = restrict_link_to_ima;
119 perm |= KEY_USR_WRITE;
122 return __integrity_init_keyring(id, perm, restriction);
125 int __init integrity_add_key(const unsigned int id, const void *data,
126 off_t size, key_perm_t perm)
134 key = key_create_or_update(make_key_ref(keyring[id], 1), "asymmetric",
135 NULL, data, size, perm,
136 KEY_ALLOC_NOT_IN_QUOTA);
139 pr_err("Problem loading X.509 certificate %d\n", rc);
141 pr_notice("Loaded X.509 cert '%s'\n",
142 key_ref_to_ptr(key)->description);
150 int __init integrity_load_x509(const unsigned int id, const char *path)
157 rc = kernel_read_file_from_path(path, &data, &size, 0,
158 READING_X509_CERTIFICATE);
160 pr_err("Unable to open file: %s (%d)", path, rc);
164 perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW | KEY_USR_READ;
166 pr_info("Loading X.509 certificate: %s\n", path);
167 rc = integrity_add_key(id, (const void *)data, size, perm);
173 int __init integrity_load_cert(const unsigned int id, const char *source,
174 const void *data, size_t len, key_perm_t perm)
179 pr_info("Loading X.509 certificate: %s\n", source);
180 return integrity_add_key(id, data, len, perm);