mirror of
https://gitlab.com/qemu-project/qemu
synced 2024-09-06 18:05:37 +00:00
![Marc-André Lureau](/assets/img/avatar_default.png)
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <20220323155743.1585078-33-marcandre.lureau@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
233 lines
6.6 KiB
C
233 lines
6.6 KiB
C
/*
|
|
* QEMU Crypto af_alg-backend cipher support
|
|
*
|
|
* Copyright (c) 2017 HUAWEI TECHNOLOGIES CO., LTD.
|
|
*
|
|
* Authors:
|
|
* Longpeng(Mike) <longpeng2@huawei.com>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2 or
|
|
* (at your option) any later version. See the COPYING file in the
|
|
* top-level directory.
|
|
*/
|
|
#include "qemu/osdep.h"
|
|
#include "qemu/sockets.h"
|
|
#include "qapi/error.h"
|
|
#include "crypto/cipher.h"
|
|
#include "cipherpriv.h"
|
|
|
|
|
|
static char *
|
|
qcrypto_afalg_cipher_format_name(QCryptoCipherAlgorithm alg,
|
|
QCryptoCipherMode mode,
|
|
Error **errp)
|
|
{
|
|
char *name;
|
|
const char *alg_name;
|
|
const char *mode_name;
|
|
|
|
switch (alg) {
|
|
case QCRYPTO_CIPHER_ALG_AES_128:
|
|
case QCRYPTO_CIPHER_ALG_AES_192:
|
|
case QCRYPTO_CIPHER_ALG_AES_256:
|
|
alg_name = "aes";
|
|
break;
|
|
case QCRYPTO_CIPHER_ALG_CAST5_128:
|
|
alg_name = "cast5";
|
|
break;
|
|
case QCRYPTO_CIPHER_ALG_SERPENT_128:
|
|
case QCRYPTO_CIPHER_ALG_SERPENT_192:
|
|
case QCRYPTO_CIPHER_ALG_SERPENT_256:
|
|
alg_name = "serpent";
|
|
break;
|
|
case QCRYPTO_CIPHER_ALG_TWOFISH_128:
|
|
case QCRYPTO_CIPHER_ALG_TWOFISH_192:
|
|
case QCRYPTO_CIPHER_ALG_TWOFISH_256:
|
|
alg_name = "twofish";
|
|
break;
|
|
|
|
default:
|
|
error_setg(errp, "Unsupported cipher algorithm %d", alg);
|
|
return NULL;
|
|
}
|
|
|
|
mode_name = QCryptoCipherMode_str(mode);
|
|
name = g_strdup_printf("%s(%s)", mode_name, alg_name);
|
|
|
|
return name;
|
|
}
|
|
|
|
static const struct QCryptoCipherDriver qcrypto_cipher_afalg_driver;
|
|
|
|
QCryptoCipher *
|
|
qcrypto_afalg_cipher_ctx_new(QCryptoCipherAlgorithm alg,
|
|
QCryptoCipherMode mode,
|
|
const uint8_t *key,
|
|
size_t nkey, Error **errp)
|
|
{
|
|
QCryptoAFAlg *afalg;
|
|
size_t expect_niv;
|
|
char *name;
|
|
|
|
name = qcrypto_afalg_cipher_format_name(alg, mode, errp);
|
|
if (!name) {
|
|
return NULL;
|
|
}
|
|
|
|
afalg = qcrypto_afalg_comm_alloc(AFALG_TYPE_CIPHER, name, errp);
|
|
if (!afalg) {
|
|
g_free(name);
|
|
return NULL;
|
|
}
|
|
|
|
g_free(name);
|
|
|
|
/* setkey */
|
|
if (setsockopt(afalg->tfmfd, SOL_ALG, ALG_SET_KEY, key,
|
|
nkey) != 0) {
|
|
error_setg_errno(errp, errno, "Set key failed");
|
|
qcrypto_afalg_comm_free(afalg);
|
|
return NULL;
|
|
}
|
|
|
|
/* prepare msg header */
|
|
afalg->msg = g_new0(struct msghdr, 1);
|
|
afalg->msg->msg_controllen += CMSG_SPACE(ALG_OPTYPE_LEN);
|
|
expect_niv = qcrypto_cipher_get_iv_len(alg, mode);
|
|
if (expect_niv) {
|
|
afalg->msg->msg_controllen += CMSG_SPACE(ALG_MSGIV_LEN(expect_niv));
|
|
}
|
|
afalg->msg->msg_control = g_new0(uint8_t, afalg->msg->msg_controllen);
|
|
|
|
/* We use 1st msghdr for crypto-info and 2nd msghdr for IV-info */
|
|
afalg->cmsg = CMSG_FIRSTHDR(afalg->msg);
|
|
afalg->cmsg->cmsg_type = ALG_SET_OP;
|
|
afalg->cmsg->cmsg_len = CMSG_SPACE(ALG_OPTYPE_LEN);
|
|
if (expect_niv) {
|
|
afalg->cmsg = CMSG_NXTHDR(afalg->msg, afalg->cmsg);
|
|
afalg->cmsg->cmsg_type = ALG_SET_IV;
|
|
afalg->cmsg->cmsg_len = CMSG_SPACE(ALG_MSGIV_LEN(expect_niv));
|
|
}
|
|
afalg->cmsg = CMSG_FIRSTHDR(afalg->msg);
|
|
|
|
afalg->base.driver = &qcrypto_cipher_afalg_driver;
|
|
return &afalg->base;
|
|
}
|
|
|
|
static int
|
|
qcrypto_afalg_cipher_setiv(QCryptoCipher *cipher,
|
|
const uint8_t *iv,
|
|
size_t niv, Error **errp)
|
|
{
|
|
QCryptoAFAlg *afalg = container_of(cipher, QCryptoAFAlg, base);
|
|
struct af_alg_iv *alg_iv;
|
|
size_t expect_niv;
|
|
|
|
expect_niv = qcrypto_cipher_get_iv_len(cipher->alg, cipher->mode);
|
|
if (niv != expect_niv) {
|
|
error_setg(errp, "Set IV len(%zu) not match expected(%zu)",
|
|
niv, expect_niv);
|
|
return -1;
|
|
}
|
|
|
|
/* move ->cmsg to next msghdr, for IV-info */
|
|
afalg->cmsg = CMSG_NXTHDR(afalg->msg, afalg->cmsg);
|
|
|
|
/* build setiv msg */
|
|
afalg->cmsg->cmsg_level = SOL_ALG;
|
|
alg_iv = (struct af_alg_iv *)CMSG_DATA(afalg->cmsg);
|
|
alg_iv->ivlen = niv;
|
|
memcpy(alg_iv->iv, iv, niv);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
qcrypto_afalg_cipher_op(QCryptoAFAlg *afalg,
|
|
const void *in, void *out,
|
|
size_t len, bool do_encrypt,
|
|
Error **errp)
|
|
{
|
|
uint32_t *type = NULL;
|
|
struct iovec iov;
|
|
size_t ret, rlen, done = 0;
|
|
uint32_t origin_controllen;
|
|
|
|
origin_controllen = afalg->msg->msg_controllen;
|
|
/* movev ->cmsg to first header, for crypto-info */
|
|
afalg->cmsg = CMSG_FIRSTHDR(afalg->msg);
|
|
|
|
/* build encrypt msg */
|
|
afalg->cmsg->cmsg_level = SOL_ALG;
|
|
afalg->msg->msg_iov = &iov;
|
|
afalg->msg->msg_iovlen = 1;
|
|
type = (uint32_t *)CMSG_DATA(afalg->cmsg);
|
|
if (do_encrypt) {
|
|
*type = ALG_OP_ENCRYPT;
|
|
} else {
|
|
*type = ALG_OP_DECRYPT;
|
|
}
|
|
|
|
do {
|
|
iov.iov_base = (void *)in + done;
|
|
iov.iov_len = len - done;
|
|
|
|
/* send info to AF_ALG core */
|
|
ret = sendmsg(afalg->opfd, afalg->msg, 0);
|
|
if (ret == -1) {
|
|
error_setg_errno(errp, errno, "Send data to AF_ALG core failed");
|
|
return -1;
|
|
}
|
|
|
|
/* encrypto && get result */
|
|
rlen = read(afalg->opfd, out, ret);
|
|
if (rlen == -1) {
|
|
error_setg_errno(errp, errno, "Get result from AF_ALG core failed");
|
|
return -1;
|
|
}
|
|
assert(rlen == ret);
|
|
|
|
/* do not update IV for following chunks */
|
|
afalg->msg->msg_controllen = 0;
|
|
done += ret;
|
|
} while (done < len);
|
|
|
|
afalg->msg->msg_controllen = origin_controllen;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
qcrypto_afalg_cipher_encrypt(QCryptoCipher *cipher,
|
|
const void *in, void *out,
|
|
size_t len, Error **errp)
|
|
{
|
|
QCryptoAFAlg *afalg = container_of(cipher, QCryptoAFAlg, base);
|
|
|
|
return qcrypto_afalg_cipher_op(afalg, in, out, len, true, errp);
|
|
}
|
|
|
|
static int
|
|
qcrypto_afalg_cipher_decrypt(QCryptoCipher *cipher,
|
|
const void *in, void *out,
|
|
size_t len, Error **errp)
|
|
{
|
|
QCryptoAFAlg *afalg = container_of(cipher, QCryptoAFAlg, base);
|
|
|
|
return qcrypto_afalg_cipher_op(afalg, in, out, len, false, errp);
|
|
}
|
|
|
|
static void qcrypto_afalg_comm_ctx_free(QCryptoCipher *cipher)
|
|
{
|
|
QCryptoAFAlg *afalg = container_of(cipher, QCryptoAFAlg, base);
|
|
|
|
qcrypto_afalg_comm_free(afalg);
|
|
}
|
|
|
|
static const struct QCryptoCipherDriver qcrypto_cipher_afalg_driver = {
|
|
.cipher_encrypt = qcrypto_afalg_cipher_encrypt,
|
|
.cipher_decrypt = qcrypto_afalg_cipher_decrypt,
|
|
.cipher_setiv = qcrypto_afalg_cipher_setiv,
|
|
.cipher_free = qcrypto_afalg_comm_ctx_free,
|
|
};
|