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/*
* QEMU TLS Cipher Suites
*
* Copyright (c) 2018-2020 Red Hat, Inc.
*
* Author: Philippe Mathieu-Daudé <philmd@redhat.com>
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qom/object_interfaces.h"
#include "crypto/tlscreds.h"
#include "crypto/tls-cipher-suites.h"
#include "hw/nvram/fw_cfg.h"
#include "trace.h"
/*
* IANA registered TLS ciphers:
* https://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml#tls-parameters-4
*/
typedef struct {
uint8_t data[2];
} QEMU_PACKED IANA_TLS_CIPHER;
GByteArray *qcrypto_tls_cipher_suites_get_data(QCryptoTLSCipherSuites *obj,
Error **errp)
{
QCryptoTLSCreds *creds = QCRYPTO_TLS_CREDS(obj);
gnutls_priority_t pcache;
GByteArray *byte_array;
const char *err;
size_t i;
int ret;
trace_qcrypto_tls_cipher_suite_priority(creds->priority);
ret = gnutls_priority_init(&pcache, creds->priority, &err);
if (ret < 0) {
error_setg(errp, "Syntax error using priority '%s': %s",
creds->priority, gnutls_strerror(ret));
return NULL;
}
byte_array = g_byte_array_new();
for (i = 0;; i++) {
int ret;
unsigned idx;
const char *name;
IANA_TLS_CIPHER cipher;
gnutls_protocol_t protocol;
const char *version;
ret = gnutls_priority_get_cipher_suite_index(pcache, i, &idx);
if (ret == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) {
break;
}
if (ret == GNUTLS_E_UNKNOWN_CIPHER_SUITE) {
continue;
}
name = gnutls_cipher_suite_info(idx, (unsigned char *)&cipher,
NULL, NULL, NULL, &protocol);
if (name == NULL) {
continue;
}
version = gnutls_protocol_get_name(protocol);
g_byte_array_append(byte_array, cipher.data, 2);
trace_qcrypto_tls_cipher_suite_info(cipher.data[0],
cipher.data[1],
version, name);
}
trace_qcrypto_tls_cipher_suite_count(byte_array->len);
gnutls_priority_deinit(pcache);
return byte_array;
}
static void qcrypto_tls_cipher_suites_complete(UserCreatable *uc,
Error **errp)
{
QCryptoTLSCreds *creds = QCRYPTO_TLS_CREDS(uc);
if (!creds->priority) {
error_setg(errp, "'priority' property is not set");
return;
}
}
static GByteArray *qcrypto_tls_cipher_suites_fw_cfg_gen_data(Object *obj,
Error **errp)
{
return qcrypto_tls_cipher_suites_get_data(QCRYPTO_TLS_CIPHER_SUITES(obj),
errp);
}
static void qcrypto_tls_cipher_suites_class_init(ObjectClass *oc, void *data)
{
UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
FWCfgDataGeneratorClass *fwgc = FW_CFG_DATA_GENERATOR_CLASS(oc);
ucc->complete = qcrypto_tls_cipher_suites_complete;
fwgc->get_data = qcrypto_tls_cipher_suites_fw_cfg_gen_data;
}
static const TypeInfo qcrypto_tls_cipher_suites_info = {
.parent = TYPE_QCRYPTO_TLS_CREDS,
.name = TYPE_QCRYPTO_TLS_CIPHER_SUITES,
.instance_size = sizeof(QCryptoTLSCipherSuites),
.class_size = sizeof(QCryptoTLSCredsClass),
.class_init = qcrypto_tls_cipher_suites_class_init,
.interfaces = (InterfaceInfo[]) {
{ TYPE_USER_CREATABLE },
{ TYPE_FW_CFG_DATA_GENERATOR_INTERFACE },
{ }
}
};
static void qcrypto_tls_cipher_suites_register_types(void)
{
type_register_static(&qcrypto_tls_cipher_suites_info);
}
type_init(qcrypto_tls_cipher_suites_register_types);
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