mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
synced 2024-12-28 16:52:18 +00:00
46b3ff73af
The SM2 algorithm has a single user in the kernel. However, it's never been integrated properly with that user: asymmetric_keys. The crux of the issue is that the way it computes its digest with sm3 does not fit into the architecture of asymmetric_keys. As no solution has been proposed, remove this algorithm. It can be resubmitted when it is integrated properly into the asymmetric_keys subsystem. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
134 lines
2.9 KiB
C
134 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright (C) 2013 Intel Corporation
|
|
*
|
|
* Author:
|
|
* Dmitry Kasatkin <dmitry.kasatkin@intel.com>
|
|
*/
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/ratelimit.h>
|
|
#include <linux/key-type.h>
|
|
#include <crypto/public_key.h>
|
|
#include <crypto/hash_info.h>
|
|
#include <keys/asymmetric-type.h>
|
|
#include <keys/system_keyring.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);
|
|
|
|
key = get_ima_blacklist_keyring();
|
|
if (key) {
|
|
key_ref_t kref;
|
|
|
|
kref = keyring_search(make_key_ref(key, 1),
|
|
&key_type_asymmetric, name, true);
|
|
if (!IS_ERR(kref)) {
|
|
pr_err("Key '%s' is in ima_blacklist_keyring\n", name);
|
|
return ERR_PTR(-EKEYREJECTED);
|
|
}
|
|
}
|
|
|
|
if (keyring) {
|
|
/* search in specific keyring */
|
|
key_ref_t kref;
|
|
|
|
kref = keyring_search(make_key_ref(keyring, 1),
|
|
&key_type_asymmetric, name, true);
|
|
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)) {
|
|
if (keyring)
|
|
pr_err_ratelimited("Request for unknown key '%s' in '%s' keyring. err %ld\n",
|
|
name, keyring->description,
|
|
PTR_ERR(key));
|
|
else
|
|
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;
|
|
const struct public_key *pk;
|
|
struct key *key;
|
|
int ret;
|
|
|
|
if (siglen <= sizeof(*hdr))
|
|
return -EBADMSG;
|
|
|
|
siglen -= sizeof(*hdr);
|
|
|
|
if (siglen != be16_to_cpu(hdr->sig_size))
|
|
return -EBADMSG;
|
|
|
|
if (hdr->hash_algo >= HASH_ALGO__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.hash_algo = hash_algo_name[hdr->hash_algo];
|
|
|
|
pk = asymmetric_key_public_key(key);
|
|
pks.pkey_algo = pk->pkey_algo;
|
|
if (!strcmp(pk->pkey_algo, "rsa")) {
|
|
pks.encoding = "pkcs1";
|
|
} else if (!strncmp(pk->pkey_algo, "ecdsa-", 6)) {
|
|
/* edcsa-nist-p192 etc. */
|
|
pks.encoding = "x962";
|
|
} else if (!strcmp(pk->pkey_algo, "ecrdsa")) {
|
|
pks.encoding = "raw";
|
|
} else {
|
|
ret = -ENOPKG;
|
|
goto out;
|
|
}
|
|
|
|
pks.digest = (u8 *)data;
|
|
pks.digest_size = datalen;
|
|
pks.s = hdr->sig;
|
|
pks.s_size = siglen;
|
|
ret = verify_signature(key, &pks);
|
|
out:
|
|
key_put(key);
|
|
pr_debug("%s() = %d\n", __func__, ret);
|
|
return ret;
|
|
}
|