blob: 940104ee55222337b577ee23944a63c3c25d46bf [file] [log] [blame]
/*
* QEMU Cryptodev backend for QEMU cipher APIs
*
* Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
*
* Authors:
* Gonglei <arei.gonglei@huawei.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
*/
#include "qemu/osdep.h"
#include "sysemu/cryptodev.h"
#include "qemu/error-report.h"
#include "qapi/error.h"
#include "standard-headers/linux/virtio_crypto.h"
#include "crypto/cipher.h"
#include "crypto/akcipher.h"
#include "qom/object.h"
/**
* @TYPE_CRYPTODEV_BACKEND_BUILTIN:
* name of backend that uses QEMU cipher API
*/
#define TYPE_CRYPTODEV_BACKEND_BUILTIN "cryptodev-backend-builtin"
OBJECT_DECLARE_SIMPLE_TYPE(CryptoDevBackendBuiltin, CRYPTODEV_BACKEND_BUILTIN)
typedef struct CryptoDevBackendBuiltinSession {
QCryptoCipher *cipher;
uint8_t direction; /* encryption or decryption */
uint8_t type; /* cipher? hash? aead? */
QCryptoAkCipher *akcipher;
QTAILQ_ENTRY(CryptoDevBackendBuiltinSession) next;
} CryptoDevBackendBuiltinSession;
/* Max number of symmetric/asymmetric sessions */
#define MAX_NUM_SESSIONS 256
#define CRYPTODEV_BUITLIN_MAX_AUTH_KEY_LEN 512
#define CRYPTODEV_BUITLIN_MAX_CIPHER_KEY_LEN 64
struct CryptoDevBackendBuiltin {
CryptoDevBackend parent_obj;
CryptoDevBackendBuiltinSession *sessions[MAX_NUM_SESSIONS];
};
static void cryptodev_builtin_init_akcipher(CryptoDevBackend *backend)
{
QCryptoAkCipherOptions opts;
opts.alg = QCRYPTO_AKCIPHER_ALG_RSA;
opts.u.rsa.padding_alg = QCRYPTO_RSA_PADDING_ALG_RAW;
if (qcrypto_akcipher_supports(&opts)) {
backend->conf.crypto_services |=
(1u << QCRYPTODEV_BACKEND_SERVICE_AKCIPHER);
backend->conf.akcipher_algo = 1u << VIRTIO_CRYPTO_AKCIPHER_RSA;
}
}
static void cryptodev_builtin_init(
CryptoDevBackend *backend, Error **errp)
{
/* Only support one queue */
int queues = backend->conf.peers.queues;
CryptoDevBackendClient *cc;
if (queues != 1) {
error_setg(errp,
"Only support one queue in cryptdov-builtin backend");
return;
}
cc = cryptodev_backend_new_client();
cc->info_str = g_strdup_printf("cryptodev-builtin0");
cc->queue_index = 0;
cc->type = QCRYPTODEV_BACKEND_TYPE_BUILTIN;
backend->conf.peers.ccs[0] = cc;
backend->conf.crypto_services =
1u << QCRYPTODEV_BACKEND_SERVICE_CIPHER |
1u << QCRYPTODEV_BACKEND_SERVICE_HASH |
1u << QCRYPTODEV_BACKEND_SERVICE_MAC;
backend->conf.cipher_algo_l = 1u << VIRTIO_CRYPTO_CIPHER_AES_CBC;
backend->conf.hash_algo = 1u << VIRTIO_CRYPTO_HASH_SHA1;
/*
* Set the Maximum length of crypto request.
* Why this value? Just avoid to overflow when
* memory allocation for each crypto request.
*/
backend->conf.max_size = LONG_MAX - sizeof(CryptoDevBackendOpInfo);
backend->conf.max_cipher_key_len = CRYPTODEV_BUITLIN_MAX_CIPHER_KEY_LEN;
backend->conf.max_auth_key_len = CRYPTODEV_BUITLIN_MAX_AUTH_KEY_LEN;
cryptodev_builtin_init_akcipher(backend);
cryptodev_backend_set_ready(backend, true);
}
static int
cryptodev_builtin_get_unused_session_index(
CryptoDevBackendBuiltin *builtin)
{
size_t i;
for (i = 0; i < MAX_NUM_SESSIONS; i++) {
if (builtin->sessions[i] == NULL) {
return i;
}
}
return -1;
}
#define AES_KEYSIZE_128 16
#define AES_KEYSIZE_192 24
#define AES_KEYSIZE_256 32
#define AES_KEYSIZE_128_XTS AES_KEYSIZE_256
#define AES_KEYSIZE_256_XTS 64
static int
cryptodev_builtin_get_aes_algo(uint32_t key_len, int mode, Error **errp)
{
int algo;
if (key_len == AES_KEYSIZE_128) {
algo = QCRYPTO_CIPHER_ALG_AES_128;
} else if (key_len == AES_KEYSIZE_192) {
algo = QCRYPTO_CIPHER_ALG_AES_192;
} else if (key_len == AES_KEYSIZE_256) { /* equals AES_KEYSIZE_128_XTS */
if (mode == QCRYPTO_CIPHER_MODE_XTS) {
algo = QCRYPTO_CIPHER_ALG_AES_128;
} else {
algo = QCRYPTO_CIPHER_ALG_AES_256;
}
} else if (key_len == AES_KEYSIZE_256_XTS) {
if (mode == QCRYPTO_CIPHER_MODE_XTS) {
algo = QCRYPTO_CIPHER_ALG_AES_256;
} else {
goto err;
}
} else {
goto err;
}
return algo;
err:
error_setg(errp, "Unsupported key length :%u", key_len);
return -1;
}
static int cryptodev_builtin_get_rsa_hash_algo(
int virtio_rsa_hash, Error **errp)
{
switch (virtio_rsa_hash) {
case VIRTIO_CRYPTO_RSA_MD5:
return QCRYPTO_HASH_ALG_MD5;
case VIRTIO_CRYPTO_RSA_SHA1:
return QCRYPTO_HASH_ALG_SHA1;
case VIRTIO_CRYPTO_RSA_SHA256:
return QCRYPTO_HASH_ALG_SHA256;
case VIRTIO_CRYPTO_RSA_SHA512:
return QCRYPTO_HASH_ALG_SHA512;
default:
error_setg(errp, "Unsupported rsa hash algo: %d", virtio_rsa_hash);
return -1;
}
}
static int cryptodev_builtin_set_rsa_options(
int virtio_padding_algo,
int virtio_hash_algo,
QCryptoAkCipherOptionsRSA *opt,
Error **errp)
{
if (virtio_padding_algo == VIRTIO_CRYPTO_RSA_PKCS1_PADDING) {
int hash_alg;
hash_alg = cryptodev_builtin_get_rsa_hash_algo(virtio_hash_algo, errp);
if (hash_alg < 0) {
return -1;
}
opt->hash_alg = hash_alg;
opt->padding_alg = QCRYPTO_RSA_PADDING_ALG_PKCS1;
return 0;
}
if (virtio_padding_algo == VIRTIO_CRYPTO_RSA_RAW_PADDING) {
opt->padding_alg = QCRYPTO_RSA_PADDING_ALG_RAW;
return 0;
}
error_setg(errp, "Unsupported rsa padding algo: %d", virtio_padding_algo);
return -1;
}
static int cryptodev_builtin_create_cipher_session(
CryptoDevBackendBuiltin *builtin,
CryptoDevBackendSymSessionInfo *sess_info,
Error **errp)
{
int algo;
int mode;
QCryptoCipher *cipher;
int index;
CryptoDevBackendBuiltinSession *sess;
if (sess_info->op_type != VIRTIO_CRYPTO_SYM_OP_CIPHER) {
error_setg(errp, "Unsupported optype :%u", sess_info->op_type);
return -1;
}
index = cryptodev_builtin_get_unused_session_index(builtin);
if (index < 0) {
error_setg(errp, "Total number of sessions created exceeds %u",
MAX_NUM_SESSIONS);
return -1;
}
switch (sess_info->cipher_alg) {
case VIRTIO_CRYPTO_CIPHER_AES_ECB:
mode = QCRYPTO_CIPHER_MODE_ECB;
algo = cryptodev_builtin_get_aes_algo(sess_info->key_len,
mode, errp);
if (algo < 0) {
return -1;
}
break;
case VIRTIO_CRYPTO_CIPHER_AES_CBC:
mode = QCRYPTO_CIPHER_MODE_CBC;
algo = cryptodev_builtin_get_aes_algo(sess_info->key_len,
mode, errp);
if (algo < 0) {
return -1;
}
break;
case VIRTIO_CRYPTO_CIPHER_AES_CTR:
mode = QCRYPTO_CIPHER_MODE_CTR;
algo = cryptodev_builtin_get_aes_algo(sess_info->key_len,
mode, errp);
if (algo < 0) {
return -1;
}
break;
case VIRTIO_CRYPTO_CIPHER_AES_XTS:
mode = QCRYPTO_CIPHER_MODE_XTS;
algo = cryptodev_builtin_get_aes_algo(sess_info->key_len,
mode, errp);
if (algo < 0) {
return -1;
}
break;
case VIRTIO_CRYPTO_CIPHER_3DES_ECB:
mode = QCRYPTO_CIPHER_MODE_ECB;
algo = QCRYPTO_CIPHER_ALG_3DES;
break;
case VIRTIO_CRYPTO_CIPHER_3DES_CBC:
mode = QCRYPTO_CIPHER_MODE_CBC;
algo = QCRYPTO_CIPHER_ALG_3DES;
break;
case VIRTIO_CRYPTO_CIPHER_3DES_CTR:
mode = QCRYPTO_CIPHER_MODE_CTR;
algo = QCRYPTO_CIPHER_ALG_3DES;
break;
default:
error_setg(errp, "Unsupported cipher alg :%u",
sess_info->cipher_alg);
return -1;
}
cipher = qcrypto_cipher_new(algo, mode,
sess_info->cipher_key,
sess_info->key_len,
errp);
if (!cipher) {
return -1;
}
sess = g_new0(CryptoDevBackendBuiltinSession, 1);
sess->cipher = cipher;
sess->direction = sess_info->direction;
sess->type = sess_info->op_type;
builtin->sessions[index] = sess;
return index;
}
static int cryptodev_builtin_create_akcipher_session(
CryptoDevBackendBuiltin *builtin,
CryptoDevBackendAsymSessionInfo *sess_info,
Error **errp)
{
CryptoDevBackendBuiltinSession *sess;
QCryptoAkCipher *akcipher;
int index;
QCryptoAkCipherKeyType type;
QCryptoAkCipherOptions opts;
switch (sess_info->algo) {
case VIRTIO_CRYPTO_AKCIPHER_RSA:
opts.alg = QCRYPTO_AKCIPHER_ALG_RSA;
if (cryptodev_builtin_set_rsa_options(sess_info->u.rsa.padding_algo,
sess_info->u.rsa.hash_algo, &opts.u.rsa, errp) != 0) {
return -1;
}
break;
/* TODO support DSA&ECDSA until qemu crypto framework support these */
default:
error_setg(errp, "Unsupported akcipher alg %u", sess_info->algo);
return -1;
}
switch (sess_info->keytype) {
case VIRTIO_CRYPTO_AKCIPHER_KEY_TYPE_PUBLIC:
type = QCRYPTO_AKCIPHER_KEY_TYPE_PUBLIC;
break;
case VIRTIO_CRYPTO_AKCIPHER_KEY_TYPE_PRIVATE:
type = QCRYPTO_AKCIPHER_KEY_TYPE_PRIVATE;
break;
default:
error_setg(errp, "Unsupported akcipher keytype %u", sess_info->keytype);
return -1;
}
index = cryptodev_builtin_get_unused_session_index(builtin);
if (index < 0) {
error_setg(errp, "Total number of sessions created exceeds %u",
MAX_NUM_SESSIONS);
return -1;
}
akcipher = qcrypto_akcipher_new(&opts, type, sess_info->key,
sess_info->keylen, errp);
if (!akcipher) {
return -1;
}
sess = g_new0(CryptoDevBackendBuiltinSession, 1);
sess->akcipher = akcipher;
builtin->sessions[index] = sess;
return index;
}
static int cryptodev_builtin_create_session(
CryptoDevBackend *backend,
CryptoDevBackendSessionInfo *sess_info,
uint32_t queue_index,
CryptoDevCompletionFunc cb,
void *opaque)
{
CryptoDevBackendBuiltin *builtin =
CRYPTODEV_BACKEND_BUILTIN(backend);
CryptoDevBackendSymSessionInfo *sym_sess_info;
CryptoDevBackendAsymSessionInfo *asym_sess_info;
int ret, status;
Error *local_error = NULL;
switch (sess_info->op_code) {
case VIRTIO_CRYPTO_CIPHER_CREATE_SESSION:
sym_sess_info = &sess_info->u.sym_sess_info;
ret = cryptodev_builtin_create_cipher_session(
builtin, sym_sess_info, &local_error);
break;
case VIRTIO_CRYPTO_AKCIPHER_CREATE_SESSION:
asym_sess_info = &sess_info->u.asym_sess_info;
ret = cryptodev_builtin_create_akcipher_session(
builtin, asym_sess_info, &local_error);
break;
case VIRTIO_CRYPTO_HASH_CREATE_SESSION:
case VIRTIO_CRYPTO_MAC_CREATE_SESSION:
default:
error_report("Unsupported opcode :%" PRIu32 "",
sess_info->op_code);
return -VIRTIO_CRYPTO_NOTSUPP;
}
if (local_error) {
error_report_err(local_error);
}
if (ret < 0) {
status = -VIRTIO_CRYPTO_ERR;
} else {
sess_info->session_id = ret;
status = VIRTIO_CRYPTO_OK;
}
if (cb) {
cb(opaque, status);
}
return 0;
}
static int cryptodev_builtin_close_session(
CryptoDevBackend *backend,
uint64_t session_id,
uint32_t queue_index,
CryptoDevCompletionFunc cb,
void *opaque)
{
CryptoDevBackendBuiltin *builtin =
CRYPTODEV_BACKEND_BUILTIN(backend);
CryptoDevBackendBuiltinSession *session;
if (session_id >= MAX_NUM_SESSIONS || !builtin->sessions[session_id]) {
return -VIRTIO_CRYPTO_INVSESS;
}
session = builtin->sessions[session_id];
if (session->cipher) {
qcrypto_cipher_free(session->cipher);
} else if (session->akcipher) {
qcrypto_akcipher_free(session->akcipher);
}
g_free(session);
builtin->sessions[session_id] = NULL;
if (cb) {
cb(opaque, VIRTIO_CRYPTO_OK);
}
return 0;
}
static int cryptodev_builtin_sym_operation(
CryptoDevBackendBuiltinSession *sess,
CryptoDevBackendSymOpInfo *op_info, Error **errp)
{
int ret;
if (op_info->op_type == VIRTIO_CRYPTO_SYM_OP_ALGORITHM_CHAINING) {
error_setg(errp,
"Algorithm chain is unsupported for cryptdoev-builtin");
return -VIRTIO_CRYPTO_NOTSUPP;
}
if (op_info->iv_len > 0) {
ret = qcrypto_cipher_setiv(sess->cipher, op_info->iv,
op_info->iv_len, errp);
if (ret < 0) {
return -VIRTIO_CRYPTO_ERR;
}
}
if (sess->direction == VIRTIO_CRYPTO_OP_ENCRYPT) {
ret = qcrypto_cipher_encrypt(sess->cipher, op_info->src,
op_info->dst, op_info->src_len, errp);
if (ret < 0) {
return -VIRTIO_CRYPTO_ERR;
}
} else {
ret = qcrypto_cipher_decrypt(sess->cipher, op_info->src,
op_info->dst, op_info->src_len, errp);
if (ret < 0) {
return -VIRTIO_CRYPTO_ERR;
}
}
return VIRTIO_CRYPTO_OK;
}
static int cryptodev_builtin_asym_operation(
CryptoDevBackendBuiltinSession *sess, uint32_t op_code,
CryptoDevBackendAsymOpInfo *op_info, Error **errp)
{
int ret;
switch (op_code) {
case VIRTIO_CRYPTO_AKCIPHER_ENCRYPT:
ret = qcrypto_akcipher_encrypt(sess->akcipher,
op_info->src, op_info->src_len,
op_info->dst, op_info->dst_len, errp);
break;
case VIRTIO_CRYPTO_AKCIPHER_DECRYPT:
ret = qcrypto_akcipher_decrypt(sess->akcipher,
op_info->src, op_info->src_len,
op_info->dst, op_info->dst_len, errp);
break;
case VIRTIO_CRYPTO_AKCIPHER_SIGN:
ret = qcrypto_akcipher_sign(sess->akcipher,
op_info->src, op_info->src_len,
op_info->dst, op_info->dst_len, errp);
break;
case VIRTIO_CRYPTO_AKCIPHER_VERIFY:
ret = qcrypto_akcipher_verify(sess->akcipher,
op_info->src, op_info->src_len,
op_info->dst, op_info->dst_len, errp);
break;
default:
return -VIRTIO_CRYPTO_ERR;
}
if (ret < 0) {
if (op_code == VIRTIO_CRYPTO_AKCIPHER_VERIFY) {
return -VIRTIO_CRYPTO_KEY_REJECTED;
}
return -VIRTIO_CRYPTO_ERR;
}
/* Buffer is too short, typically the driver should handle this case */
if (unlikely(ret > op_info->dst_len)) {
if (errp && !*errp) {
error_setg(errp, "dst buffer too short");
}
return -VIRTIO_CRYPTO_ERR;
}
op_info->dst_len = ret;
return VIRTIO_CRYPTO_OK;
}
static int cryptodev_builtin_operation(
CryptoDevBackend *backend,
CryptoDevBackendOpInfo *op_info)
{
CryptoDevBackendBuiltin *builtin =
CRYPTODEV_BACKEND_BUILTIN(backend);
CryptoDevBackendBuiltinSession *sess;
CryptoDevBackendSymOpInfo *sym_op_info;
CryptoDevBackendAsymOpInfo *asym_op_info;
QCryptodevBackendAlgType algtype = op_info->algtype;
int status = -VIRTIO_CRYPTO_ERR;
Error *local_error = NULL;
if (op_info->session_id >= MAX_NUM_SESSIONS ||
builtin->sessions[op_info->session_id] == NULL) {
error_report("Cannot find a valid session id: %" PRIu64 "",
op_info->session_id);
return -VIRTIO_CRYPTO_INVSESS;
}
sess = builtin->sessions[op_info->session_id];
if (algtype == QCRYPTODEV_BACKEND_ALG_SYM) {
sym_op_info = op_info->u.sym_op_info;
status = cryptodev_builtin_sym_operation(sess, sym_op_info,
&local_error);
} else if (algtype == QCRYPTODEV_BACKEND_ALG_ASYM) {
asym_op_info = op_info->u.asym_op_info;
status = cryptodev_builtin_asym_operation(sess, op_info->op_code,
asym_op_info, &local_error);
}
if (local_error) {
error_report_err(local_error);
}
if (op_info->cb) {
op_info->cb(op_info->opaque, status);
}
return 0;
}
static void cryptodev_builtin_cleanup(
CryptoDevBackend *backend,
Error **errp)
{
CryptoDevBackendBuiltin *builtin =
CRYPTODEV_BACKEND_BUILTIN(backend);
size_t i;
int queues = backend->conf.peers.queues;
CryptoDevBackendClient *cc;
for (i = 0; i < MAX_NUM_SESSIONS; i++) {
if (builtin->sessions[i] != NULL) {
cryptodev_builtin_close_session(backend, i, 0, NULL, NULL);
}
}
for (i = 0; i < queues; i++) {
cc = backend->conf.peers.ccs[i];
if (cc) {
cryptodev_backend_free_client(cc);
backend->conf.peers.ccs[i] = NULL;
}
}
cryptodev_backend_set_ready(backend, false);
}
static void
cryptodev_builtin_class_init(ObjectClass *oc, void *data)
{
CryptoDevBackendClass *bc = CRYPTODEV_BACKEND_CLASS(oc);
bc->init = cryptodev_builtin_init;
bc->cleanup = cryptodev_builtin_cleanup;
bc->create_session = cryptodev_builtin_create_session;
bc->close_session = cryptodev_builtin_close_session;
bc->do_op = cryptodev_builtin_operation;
}
static const TypeInfo cryptodev_builtin_info = {
.name = TYPE_CRYPTODEV_BACKEND_BUILTIN,
.parent = TYPE_CRYPTODEV_BACKEND,
.class_init = cryptodev_builtin_class_init,
.instance_size = sizeof(CryptoDevBackendBuiltin),
};
static void
cryptodev_builtin_register_types(void)
{
type_register_static(&cryptodev_builtin_info);
}
type_init(cryptodev_builtin_register_types);