287 lines
8.9 KiB
C++
287 lines
8.9 KiB
C++
/*************************************************************************/
|
|
/* packet_peer_mbed_dtls.cpp */
|
|
/*************************************************************************/
|
|
/* This file is part of: */
|
|
/* GODOT ENGINE */
|
|
/* https://godotengine.org */
|
|
/*************************************************************************/
|
|
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
|
|
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
|
|
/* */
|
|
/* Permission is hereby granted, free of charge, to any person obtaining */
|
|
/* a copy of this software and associated documentation files (the */
|
|
/* "Software"), to deal in the Software without restriction, including */
|
|
/* without limitation the rights to use, copy, modify, merge, publish, */
|
|
/* distribute, sublicense, and/or sell copies of the Software, and to */
|
|
/* permit persons to whom the Software is furnished to do so, subject to */
|
|
/* the following conditions: */
|
|
/* */
|
|
/* The above copyright notice and this permission notice shall be */
|
|
/* included in all copies or substantial portions of the Software. */
|
|
/* */
|
|
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
|
|
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
|
|
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
|
|
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
|
|
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
|
|
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
|
|
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
|
|
/*************************************************************************/
|
|
|
|
#include "packet_peer_mbed_dtls.h"
|
|
#include "mbedtls/platform_util.h"
|
|
|
|
#include "core/io/file_access.h"
|
|
#include "core/io/stream_peer_ssl.h"
|
|
|
|
int PacketPeerMbedDTLS::bio_send(void *ctx, const unsigned char *buf, size_t len) {
|
|
if (buf == nullptr || len <= 0) {
|
|
return 0;
|
|
}
|
|
|
|
PacketPeerMbedDTLS *sp = (PacketPeerMbedDTLS *)ctx;
|
|
|
|
ERR_FAIL_COND_V(sp == nullptr, 0);
|
|
|
|
Error err = sp->base->put_packet((const uint8_t *)buf, len);
|
|
if (err == ERR_BUSY) {
|
|
return MBEDTLS_ERR_SSL_WANT_WRITE;
|
|
} else if (err != OK) {
|
|
ERR_FAIL_V(MBEDTLS_ERR_SSL_INTERNAL_ERROR);
|
|
}
|
|
return len;
|
|
}
|
|
|
|
int PacketPeerMbedDTLS::bio_recv(void *ctx, unsigned char *buf, size_t len) {
|
|
if (buf == nullptr || len <= 0) {
|
|
return 0;
|
|
}
|
|
|
|
PacketPeerMbedDTLS *sp = (PacketPeerMbedDTLS *)ctx;
|
|
|
|
ERR_FAIL_COND_V(sp == nullptr, 0);
|
|
|
|
int pc = sp->base->get_available_packet_count();
|
|
if (pc == 0) {
|
|
return MBEDTLS_ERR_SSL_WANT_READ;
|
|
} else if (pc < 0) {
|
|
ERR_FAIL_V(MBEDTLS_ERR_SSL_INTERNAL_ERROR);
|
|
}
|
|
|
|
const uint8_t *buffer;
|
|
int buffer_size = 0;
|
|
Error err = sp->base->get_packet(&buffer, buffer_size);
|
|
if (err != OK) {
|
|
return MBEDTLS_ERR_SSL_INTERNAL_ERROR;
|
|
}
|
|
memcpy(buf, buffer, buffer_size);
|
|
return buffer_size;
|
|
}
|
|
|
|
void PacketPeerMbedDTLS::_cleanup() {
|
|
ssl_ctx->clear();
|
|
base = Ref<PacketPeer>();
|
|
status = STATUS_DISCONNECTED;
|
|
}
|
|
|
|
int PacketPeerMbedDTLS::_set_cookie() {
|
|
// Setup DTLS session cookie for this client
|
|
uint8_t client_id[18];
|
|
IPAddress addr = base->get_packet_address();
|
|
uint16_t port = base->get_packet_port();
|
|
memcpy(client_id, addr.get_ipv6(), 16);
|
|
memcpy(&client_id[16], (uint8_t *)&port, 2);
|
|
return mbedtls_ssl_set_client_transport_id(ssl_ctx->get_context(), client_id, 18);
|
|
}
|
|
|
|
Error PacketPeerMbedDTLS::_do_handshake() {
|
|
int ret = 0;
|
|
while ((ret = mbedtls_ssl_handshake(ssl_ctx->get_context())) != 0) {
|
|
if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
|
|
if (ret != MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED) {
|
|
ERR_PRINT("TLS handshake error: " + itos(ret));
|
|
SSLContextMbedTLS::print_mbedtls_error(ret);
|
|
}
|
|
_cleanup();
|
|
status = STATUS_ERROR;
|
|
return FAILED;
|
|
}
|
|
// Will retry via poll later
|
|
return OK;
|
|
}
|
|
|
|
status = STATUS_CONNECTED;
|
|
return OK;
|
|
}
|
|
|
|
Error PacketPeerMbedDTLS::connect_to_peer(Ref<PacketPeerUDP> p_base, bool p_validate_certs, const String &p_for_hostname, Ref<X509Certificate> p_ca_certs) {
|
|
ERR_FAIL_COND_V(!p_base.is_valid() || !p_base->is_connected_to_host(), ERR_INVALID_PARAMETER);
|
|
|
|
base = p_base;
|
|
int ret = 0;
|
|
int authmode = p_validate_certs ? MBEDTLS_SSL_VERIFY_REQUIRED : MBEDTLS_SSL_VERIFY_NONE;
|
|
|
|
Error err = ssl_ctx->init_client(MBEDTLS_SSL_TRANSPORT_DATAGRAM, authmode, p_ca_certs);
|
|
ERR_FAIL_COND_V(err != OK, err);
|
|
|
|
mbedtls_ssl_set_hostname(ssl_ctx->get_context(), p_for_hostname.utf8().get_data());
|
|
mbedtls_ssl_set_bio(ssl_ctx->get_context(), this, bio_send, bio_recv, nullptr);
|
|
mbedtls_ssl_set_timer_cb(ssl_ctx->get_context(), &timer, mbedtls_timing_set_delay, mbedtls_timing_get_delay);
|
|
|
|
status = STATUS_HANDSHAKING;
|
|
|
|
if ((ret = _do_handshake()) != OK) {
|
|
status = STATUS_ERROR_HOSTNAME_MISMATCH;
|
|
return FAILED;
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
Error PacketPeerMbedDTLS::accept_peer(Ref<PacketPeerUDP> p_base, Ref<CryptoKey> p_key, Ref<X509Certificate> p_cert, Ref<X509Certificate> p_ca_chain, Ref<CookieContextMbedTLS> p_cookies) {
|
|
Error err = ssl_ctx->init_server(MBEDTLS_SSL_TRANSPORT_DATAGRAM, MBEDTLS_SSL_VERIFY_NONE, p_key, p_cert, p_cookies);
|
|
ERR_FAIL_COND_V(err != OK, err);
|
|
|
|
base = p_base;
|
|
base->set_blocking_mode(false);
|
|
|
|
mbedtls_ssl_session_reset(ssl_ctx->get_context());
|
|
|
|
int ret = _set_cookie();
|
|
if (ret != 0) {
|
|
_cleanup();
|
|
ERR_FAIL_V_MSG(FAILED, "Error setting DTLS client cookie");
|
|
}
|
|
|
|
mbedtls_ssl_set_bio(ssl_ctx->get_context(), this, bio_send, bio_recv, nullptr);
|
|
mbedtls_ssl_set_timer_cb(ssl_ctx->get_context(), &timer, mbedtls_timing_set_delay, mbedtls_timing_get_delay);
|
|
|
|
status = STATUS_HANDSHAKING;
|
|
|
|
if ((ret = _do_handshake()) != OK) {
|
|
status = STATUS_ERROR;
|
|
return FAILED;
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
Error PacketPeerMbedDTLS::put_packet(const uint8_t *p_buffer, int p_bytes) {
|
|
ERR_FAIL_COND_V(status != STATUS_CONNECTED, ERR_UNCONFIGURED);
|
|
|
|
if (p_bytes == 0) {
|
|
return OK;
|
|
}
|
|
|
|
int ret = mbedtls_ssl_write(ssl_ctx->get_context(), p_buffer, p_bytes);
|
|
if (ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE) {
|
|
ret = 0; // non blocking io
|
|
} else if (ret <= 0) {
|
|
SSLContextMbedTLS::print_mbedtls_error(ret);
|
|
_cleanup();
|
|
return ERR_CONNECTION_ERROR;
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
Error PacketPeerMbedDTLS::get_packet(const uint8_t **r_buffer, int &r_bytes) {
|
|
ERR_FAIL_COND_V(status != STATUS_CONNECTED, ERR_UNCONFIGURED);
|
|
|
|
r_bytes = 0;
|
|
|
|
int ret = mbedtls_ssl_read(ssl_ctx->get_context(), packet_buffer, PACKET_BUFFER_SIZE);
|
|
if (ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE) {
|
|
ret = 0; // non blocking io
|
|
} else if (ret <= 0) {
|
|
if (ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY) {
|
|
// Also send close notify back
|
|
disconnect_from_peer();
|
|
} else {
|
|
_cleanup();
|
|
status = STATUS_ERROR;
|
|
SSLContextMbedTLS::print_mbedtls_error(ret);
|
|
}
|
|
return ERR_CONNECTION_ERROR;
|
|
}
|
|
*r_buffer = packet_buffer;
|
|
r_bytes = ret;
|
|
|
|
return OK;
|
|
}
|
|
|
|
void PacketPeerMbedDTLS::poll() {
|
|
if (status == STATUS_HANDSHAKING) {
|
|
_do_handshake();
|
|
return;
|
|
} else if (status != STATUS_CONNECTED) {
|
|
return;
|
|
}
|
|
|
|
ERR_FAIL_COND(!base.is_valid());
|
|
|
|
int ret = mbedtls_ssl_read(ssl_ctx->get_context(), nullptr, 0);
|
|
|
|
if (ret < 0 && ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
|
|
if (ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY) {
|
|
// Also send close notify back
|
|
disconnect_from_peer();
|
|
} else {
|
|
_cleanup();
|
|
status = STATUS_ERROR;
|
|
SSLContextMbedTLS::print_mbedtls_error(ret);
|
|
}
|
|
}
|
|
}
|
|
|
|
int PacketPeerMbedDTLS::get_available_packet_count() const {
|
|
ERR_FAIL_COND_V(status != STATUS_CONNECTED, 0);
|
|
|
|
return mbedtls_ssl_get_bytes_avail(&(ssl_ctx->ssl)) > 0 ? 1 : 0;
|
|
}
|
|
|
|
int PacketPeerMbedDTLS::get_max_packet_size() const {
|
|
return 488; // 512 (UDP in Godot) - 24 (DTLS header)
|
|
}
|
|
|
|
PacketPeerMbedDTLS::PacketPeerMbedDTLS() {
|
|
ssl_ctx.instantiate();
|
|
}
|
|
|
|
PacketPeerMbedDTLS::~PacketPeerMbedDTLS() {
|
|
disconnect_from_peer();
|
|
}
|
|
|
|
void PacketPeerMbedDTLS::disconnect_from_peer() {
|
|
if (status != STATUS_CONNECTED && status != STATUS_HANDSHAKING) {
|
|
return;
|
|
}
|
|
|
|
if (status == STATUS_CONNECTED) {
|
|
int ret = 0;
|
|
// Send SSL close notification, blocking, but ignore other errors.
|
|
do {
|
|
ret = mbedtls_ssl_close_notify(ssl_ctx->get_context());
|
|
} while (ret == MBEDTLS_ERR_SSL_WANT_WRITE);
|
|
}
|
|
|
|
_cleanup();
|
|
}
|
|
|
|
PacketPeerMbedDTLS::Status PacketPeerMbedDTLS::get_status() const {
|
|
return status;
|
|
}
|
|
|
|
PacketPeerDTLS *PacketPeerMbedDTLS::_create_func() {
|
|
return memnew(PacketPeerMbedDTLS);
|
|
}
|
|
|
|
void PacketPeerMbedDTLS::initialize_dtls() {
|
|
_create = _create_func;
|
|
available = true;
|
|
}
|
|
|
|
void PacketPeerMbedDTLS::finalize_dtls() {
|
|
_create = nullptr;
|
|
available = false;
|
|
}
|