mirror of https://gitee.com/openkylin/linux.git
106 lines
2.3 KiB
C
106 lines
2.3 KiB
C
/*
|
|
* Copyright (C) 2013 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/ratelimit.h>
|
|
#include <linux/key-type.h>
|
|
#include <crypto/public_key.h>
|
|
#include <keys/asymmetric-type.h>
|
|
|
|
#include "integrity.h"
|
|
|
|
/*
|
|
* Request an asymmetric key.
|
|
*/
|
|
static struct key *request_asymmetric_key(struct key *keyring, uint32_t keyid)
|
|
{
|
|
struct key *key;
|
|
char name[12];
|
|
|
|
sprintf(name, "id:%08x", keyid);
|
|
|
|
pr_debug("key search: \"%s\"\n", name);
|
|
|
|
if (keyring) {
|
|
/* search in specific keyring */
|
|
key_ref_t kref;
|
|
kref = keyring_search(make_key_ref(keyring, 1),
|
|
&key_type_asymmetric, name);
|
|
if (IS_ERR(kref))
|
|
key = ERR_CAST(kref);
|
|
else
|
|
key = key_ref_to_ptr(kref);
|
|
} else {
|
|
key = request_key(&key_type_asymmetric, name, NULL);
|
|
}
|
|
|
|
if (IS_ERR(key)) {
|
|
pr_err_ratelimited("Request for unknown key '%s' err %ld\n",
|
|
name, PTR_ERR(key));
|
|
switch (PTR_ERR(key)) {
|
|
/* Hide some search errors */
|
|
case -EACCES:
|
|
case -ENOTDIR:
|
|
case -EAGAIN:
|
|
return ERR_PTR(-ENOKEY);
|
|
default:
|
|
return key;
|
|
}
|
|
}
|
|
|
|
pr_debug("%s() = 0 [%x]\n", __func__, key_serial(key));
|
|
|
|
return key;
|
|
}
|
|
|
|
int asymmetric_verify(struct key *keyring, const char *sig,
|
|
int siglen, const char *data, int datalen)
|
|
{
|
|
struct public_key_signature pks;
|
|
struct signature_v2_hdr *hdr = (struct signature_v2_hdr *)sig;
|
|
struct key *key;
|
|
int ret = -ENOMEM;
|
|
|
|
if (siglen <= sizeof(*hdr))
|
|
return -EBADMSG;
|
|
|
|
siglen -= sizeof(*hdr);
|
|
|
|
if (siglen != __be16_to_cpu(hdr->sig_size))
|
|
return -EBADMSG;
|
|
|
|
if (hdr->hash_algo >= PKEY_HASH__LAST)
|
|
return -ENOPKG;
|
|
|
|
key = request_asymmetric_key(keyring, __be32_to_cpu(hdr->keyid));
|
|
if (IS_ERR(key))
|
|
return PTR_ERR(key);
|
|
|
|
memset(&pks, 0, sizeof(pks));
|
|
|
|
pks.pkey_hash_algo = hdr->hash_algo;
|
|
pks.digest = (u8 *)data;
|
|
pks.digest_size = datalen;
|
|
pks.nr_mpi = 1;
|
|
pks.rsa.s = mpi_read_raw_data(hdr->sig, siglen);
|
|
|
|
if (pks.rsa.s)
|
|
ret = verify_signature(key, &pks);
|
|
|
|
mpi_free(pks.rsa.s);
|
|
key_put(key);
|
|
pr_debug("%s() = %d\n", __func__, ret);
|
|
return ret;
|
|
}
|