145 строки
3.3 KiB
C
145 строки
3.3 KiB
C
/*
|
|
* Copyright (C) 2011 Intel Corporation
|
|
*
|
|
* Author:
|
|
* Dmitry Kasatkin <dmitry.kasatkin@intel.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, version 2 of the License.
|
|
*
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/cred.h>
|
|
#include <linux/key-type.h>
|
|
#include <linux/digsig.h>
|
|
#include <crypto/public_key.h>
|
|
#include <keys/system_keyring.h>
|
|
|
|
#include "integrity.h"
|
|
|
|
static struct key *keyring[INTEGRITY_KEYRING_MAX];
|
|
|
|
static const char *keyring_name[INTEGRITY_KEYRING_MAX] = {
|
|
#ifndef CONFIG_INTEGRITY_TRUSTED_KEYRING
|
|
"_evm",
|
|
"_ima",
|
|
#else
|
|
".evm",
|
|
".ima",
|
|
#endif
|
|
"_module",
|
|
};
|
|
|
|
#ifdef CONFIG_INTEGRITY_TRUSTED_KEYRING
|
|
static bool init_keyring __initdata = true;
|
|
#else
|
|
static bool init_keyring __initdata;
|
|
#endif
|
|
|
|
#ifdef CONFIG_IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY
|
|
#define restrict_link_to_ima restrict_link_by_builtin_and_secondary_trusted
|
|
#else
|
|
#define restrict_link_to_ima restrict_link_by_builtin_trusted
|
|
#endif
|
|
|
|
int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen,
|
|
const char *digest, int digestlen)
|
|
{
|
|
if (id >= INTEGRITY_KEYRING_MAX || siglen < 2)
|
|
return -EINVAL;
|
|
|
|
if (!keyring[id]) {
|
|
keyring[id] =
|
|
request_key(&key_type_keyring, keyring_name[id], NULL);
|
|
if (IS_ERR(keyring[id])) {
|
|
int err = PTR_ERR(keyring[id]);
|
|
pr_err("no %s keyring: %d\n", keyring_name[id], err);
|
|
keyring[id] = NULL;
|
|
return err;
|
|
}
|
|
}
|
|
|
|
switch (sig[1]) {
|
|
case 1:
|
|
/* v1 API expect signature without xattr type */
|
|
return digsig_verify(keyring[id], sig + 1, siglen - 1,
|
|
digest, digestlen);
|
|
case 2:
|
|
return asymmetric_verify(keyring[id], sig, siglen,
|
|
digest, digestlen);
|
|
}
|
|
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
int __init integrity_init_keyring(const unsigned int id)
|
|
{
|
|
const struct cred *cred = current_cred();
|
|
struct key_restriction *restriction;
|
|
int err = 0;
|
|
|
|
if (!init_keyring)
|
|
return 0;
|
|
|
|
restriction = kzalloc(sizeof(struct key_restriction), GFP_KERNEL);
|
|
if (!restriction)
|
|
return -ENOMEM;
|
|
|
|
restriction->check = restrict_link_to_ima;
|
|
|
|
keyring[id] = keyring_alloc(keyring_name[id], KUIDT_INIT(0),
|
|
KGIDT_INIT(0), cred,
|
|
((KEY_POS_ALL & ~KEY_POS_SETATTR) |
|
|
KEY_USR_VIEW | KEY_USR_READ |
|
|
KEY_USR_WRITE | KEY_USR_SEARCH),
|
|
KEY_ALLOC_NOT_IN_QUOTA,
|
|
restriction, NULL);
|
|
if (IS_ERR(keyring[id])) {
|
|
err = PTR_ERR(keyring[id]);
|
|
pr_info("Can't allocate %s keyring (%d)\n",
|
|
keyring_name[id], err);
|
|
keyring[id] = NULL;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
int __init integrity_load_x509(const unsigned int id, const char *path)
|
|
{
|
|
key_ref_t key;
|
|
char *data;
|
|
int rc;
|
|
|
|
if (!keyring[id])
|
|
return -EINVAL;
|
|
|
|
rc = integrity_read_file(path, &data);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
key = key_create_or_update(make_key_ref(keyring[id], 1),
|
|
"asymmetric",
|
|
NULL,
|
|
data,
|
|
rc,
|
|
((KEY_POS_ALL & ~KEY_POS_SETATTR) |
|
|
KEY_USR_VIEW | KEY_USR_READ),
|
|
KEY_ALLOC_NOT_IN_QUOTA);
|
|
if (IS_ERR(key)) {
|
|
rc = PTR_ERR(key);
|
|
pr_err("Problem loading X.509 certificate (%d): %s\n",
|
|
rc, path);
|
|
} else {
|
|
pr_notice("Loaded X.509 cert '%s': %s\n",
|
|
key_ref_to_ptr(key)->description, path);
|
|
key_ref_put(key);
|
|
}
|
|
kfree(data);
|
|
return 0;
|
|
}
|