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
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 static struct key *integrity_keyring_from_id(const unsigned int id)
44 if (id >= INTEGRITY_KEYRING_MAX)
45 return ERR_PTR(-EINVAL);
49 request_key(&key_type_keyring, keyring_name[id], NULL);
50 if (IS_ERR(keyring[id])) {
51 int err = PTR_ERR(keyring[id]);
52 pr_err("no %s keyring: %d\n", keyring_name[id], err);
61 int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
62 const char *digest, int digestlen)
69 keyring = integrity_keyring_from_id(id);
71 return PTR_ERR(keyring);
75 /* v1 API expect signature without xattr type */
76 return digsig_verify(keyring, sig + 1, siglen - 1, digest,
79 return asymmetric_verify(keyring, sig, siglen, digest,
86 int integrity_modsig_verify(const unsigned int id, const struct modsig *modsig)
90 keyring = integrity_keyring_from_id(id);
92 return PTR_ERR(keyring);
94 return ima_modsig_verify(keyring, modsig);
97 static int __init __integrity_init_keyring(const unsigned int id,
99 struct key_restriction *restriction)
101 const struct cred *cred = current_cred();
104 keyring[id] = keyring_alloc(keyring_name[id], KUIDT_INIT(0),
105 KGIDT_INIT(0), cred, perm,
106 KEY_ALLOC_NOT_IN_QUOTA, restriction, NULL);
107 if (IS_ERR(keyring[id])) {
108 err = PTR_ERR(keyring[id]);
109 pr_info("Can't allocate %s keyring (%d)\n",
110 keyring_name[id], err);
113 if (id == INTEGRITY_KEYRING_PLATFORM)
114 set_platform_trusted_keys(keyring[id]);
115 if (id == INTEGRITY_KEYRING_MACHINE && trust_moklist())
116 set_machine_trusted_keys(keyring[id]);
117 if (id == INTEGRITY_KEYRING_IMA)
118 load_module_cert(keyring[id]);
124 int __init integrity_init_keyring(const unsigned int id)
126 struct key_restriction *restriction;
129 perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW
130 | KEY_USR_READ | KEY_USR_SEARCH;
132 if (id == INTEGRITY_KEYRING_PLATFORM ||
133 id == INTEGRITY_KEYRING_MACHINE) {
138 if (!IS_ENABLED(CONFIG_INTEGRITY_TRUSTED_KEYRING))
141 restriction = kzalloc(sizeof(struct key_restriction), GFP_KERNEL);
145 restriction->check = restrict_link_to_ima;
148 * MOK keys can only be added through a read-only runtime services
149 * UEFI variable during boot. No additional keys shall be allowed to
150 * load into the machine keyring following init from userspace.
152 if (id != INTEGRITY_KEYRING_MACHINE)
153 perm |= KEY_USR_WRITE;
156 return __integrity_init_keyring(id, perm, restriction);
159 static int __init integrity_add_key(const unsigned int id, const void *data,
160 off_t size, key_perm_t perm)
168 key = key_create_or_update(make_key_ref(keyring[id], 1), "asymmetric",
169 NULL, data, size, perm,
170 KEY_ALLOC_NOT_IN_QUOTA);
173 pr_err("Problem loading X.509 certificate %d\n", rc);
175 pr_notice("Loaded X.509 cert '%s'\n",
176 key_ref_to_ptr(key)->description);
184 int __init integrity_load_x509(const unsigned int id, const char *path)
191 rc = kernel_read_file_from_path(path, 0, &data, INT_MAX, NULL,
192 READING_X509_CERTIFICATE);
194 pr_err("Unable to open file: %s (%d)", path, rc);
199 perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW | KEY_USR_READ;
201 pr_info("Loading X.509 certificate: %s\n", path);
202 rc = integrity_add_key(id, (const void *)data, size, perm);
208 int __init integrity_load_cert(const unsigned int id, const char *source,
209 const void *data, size_t len, key_perm_t perm)
214 pr_info("Loading X.509 certificate: %s\n", source);
215 return integrity_add_key(id, data, len, perm);