0be6d925dc
Which means that reduz' beloved style which we all became used to will now be changed automatically to remove the first empty line. This makes us lean closer to 1TBS (the one true brace style) instead of hybridating it with some Allman-inspired spacing. There's still the case of braces around single-statement blocks that needs to be addressed (but clang-format can't help with that, but clang-tidy may if we agree about it). Part of #33027.
285 lines
8.9 KiB
C++
285 lines
8.9 KiB
C++
/*************************************************************************/
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/* packet_peer_mbed_dtls.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#include "packet_peer_mbed_dtls.h"
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#include "mbedtls/platform_util.h"
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#include "core/io/stream_peer_ssl.h"
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#include "core/os/file_access.h"
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int PacketPeerMbedDTLS::bio_send(void *ctx, const unsigned char *buf, size_t len) {
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if (buf == nullptr || len <= 0)
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return 0;
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PacketPeerMbedDTLS *sp = (PacketPeerMbedDTLS *)ctx;
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ERR_FAIL_COND_V(sp == nullptr, 0);
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Error err = sp->base->put_packet((const uint8_t *)buf, len);
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if (err == ERR_BUSY) {
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return MBEDTLS_ERR_SSL_WANT_WRITE;
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} else if (err != OK) {
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ERR_FAIL_V(MBEDTLS_ERR_SSL_INTERNAL_ERROR);
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}
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return len;
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}
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int PacketPeerMbedDTLS::bio_recv(void *ctx, unsigned char *buf, size_t len) {
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if (buf == nullptr || len <= 0)
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return 0;
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PacketPeerMbedDTLS *sp = (PacketPeerMbedDTLS *)ctx;
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ERR_FAIL_COND_V(sp == nullptr, 0);
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int pc = sp->base->get_available_packet_count();
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if (pc == 0) {
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return MBEDTLS_ERR_SSL_WANT_READ;
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} else if (pc < 0) {
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ERR_FAIL_V(MBEDTLS_ERR_SSL_INTERNAL_ERROR);
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}
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const uint8_t *buffer;
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int buffer_size = 0;
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Error err = sp->base->get_packet(&buffer, buffer_size);
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if (err != OK) {
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return MBEDTLS_ERR_SSL_INTERNAL_ERROR;
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}
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copymem(buf, buffer, buffer_size);
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return buffer_size;
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}
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void PacketPeerMbedDTLS::_cleanup() {
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ssl_ctx->clear();
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base = Ref<PacketPeer>();
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status = STATUS_DISCONNECTED;
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}
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int PacketPeerMbedDTLS::_set_cookie() {
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// Setup DTLS session cookie for this client
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uint8_t client_id[18];
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IP_Address addr = base->get_packet_address();
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uint16_t port = base->get_packet_port();
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copymem(client_id, addr.get_ipv6(), 16);
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copymem(&client_id[16], (uint8_t *)&port, 2);
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return mbedtls_ssl_set_client_transport_id(ssl_ctx->get_context(), client_id, 18);
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}
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Error PacketPeerMbedDTLS::_do_handshake() {
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int ret = 0;
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while ((ret = mbedtls_ssl_handshake(ssl_ctx->get_context())) != 0) {
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if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
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if (ret != MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED) {
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ERR_PRINT("TLS handshake error: " + itos(ret));
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SSLContextMbedTLS::print_mbedtls_error(ret);
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}
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_cleanup();
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status = STATUS_ERROR;
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return FAILED;
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}
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// Will retry via poll later
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return OK;
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}
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status = STATUS_CONNECTED;
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return OK;
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}
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Error PacketPeerMbedDTLS::connect_to_peer(Ref<PacketPeerUDP> p_base, bool p_validate_certs, const String &p_for_hostname, Ref<X509Certificate> p_ca_certs) {
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ERR_FAIL_COND_V(!p_base.is_valid() || !p_base->is_connected_to_host(), ERR_INVALID_PARAMETER);
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base = p_base;
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int ret = 0;
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int authmode = p_validate_certs ? MBEDTLS_SSL_VERIFY_REQUIRED : MBEDTLS_SSL_VERIFY_NONE;
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Error err = ssl_ctx->init_client(MBEDTLS_SSL_TRANSPORT_DATAGRAM, authmode, p_ca_certs);
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ERR_FAIL_COND_V(err != OK, err);
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mbedtls_ssl_set_hostname(ssl_ctx->get_context(), p_for_hostname.utf8().get_data());
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mbedtls_ssl_set_bio(ssl_ctx->get_context(), this, bio_send, bio_recv, nullptr);
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mbedtls_ssl_set_timer_cb(ssl_ctx->get_context(), &timer, mbedtls_timing_set_delay, mbedtls_timing_get_delay);
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status = STATUS_HANDSHAKING;
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if ((ret = _do_handshake()) != OK) {
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status = STATUS_ERROR_HOSTNAME_MISMATCH;
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return FAILED;
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}
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return OK;
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}
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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) {
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Error err = ssl_ctx->init_server(MBEDTLS_SSL_TRANSPORT_DATAGRAM, MBEDTLS_SSL_VERIFY_NONE, p_key, p_cert, p_cookies);
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ERR_FAIL_COND_V(err != OK, err);
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base = p_base;
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base->set_blocking_mode(false);
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mbedtls_ssl_session_reset(ssl_ctx->get_context());
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int ret = _set_cookie();
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if (ret != 0) {
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_cleanup();
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ERR_FAIL_V_MSG(FAILED, "Error setting DTLS client cookie");
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}
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mbedtls_ssl_set_bio(ssl_ctx->get_context(), this, bio_send, bio_recv, nullptr);
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mbedtls_ssl_set_timer_cb(ssl_ctx->get_context(), &timer, mbedtls_timing_set_delay, mbedtls_timing_get_delay);
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status = STATUS_HANDSHAKING;
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if ((ret = _do_handshake()) != OK) {
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status = STATUS_ERROR;
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return FAILED;
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}
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return OK;
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}
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Error PacketPeerMbedDTLS::put_packet(const uint8_t *p_buffer, int p_bytes) {
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ERR_FAIL_COND_V(status != STATUS_CONNECTED, ERR_UNCONFIGURED);
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if (p_bytes == 0)
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return OK;
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int ret = mbedtls_ssl_write(ssl_ctx->get_context(), p_buffer, p_bytes);
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if (ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE) {
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ret = 0; // non blocking io
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} else if (ret <= 0) {
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SSLContextMbedTLS::print_mbedtls_error(ret);
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_cleanup();
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return ERR_CONNECTION_ERROR;
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}
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return OK;
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}
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Error PacketPeerMbedDTLS::get_packet(const uint8_t **r_buffer, int &r_bytes) {
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ERR_FAIL_COND_V(status != STATUS_CONNECTED, ERR_UNCONFIGURED);
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r_bytes = 0;
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int ret = mbedtls_ssl_read(ssl_ctx->get_context(), packet_buffer, PACKET_BUFFER_SIZE);
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if (ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE) {
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ret = 0; // non blocking io
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} else if (ret <= 0) {
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if (ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY) {
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// Also send close notify back
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disconnect_from_peer();
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} else {
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_cleanup();
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status = STATUS_ERROR;
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SSLContextMbedTLS::print_mbedtls_error(ret);
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}
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return ERR_CONNECTION_ERROR;
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}
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*r_buffer = packet_buffer;
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r_bytes = ret;
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return OK;
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}
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void PacketPeerMbedDTLS::poll() {
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if (status == STATUS_HANDSHAKING) {
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_do_handshake();
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return;
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} else if (status != STATUS_CONNECTED) {
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return;
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}
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ERR_FAIL_COND(!base.is_valid());
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int ret = mbedtls_ssl_read(ssl_ctx->get_context(), nullptr, 0);
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if (ret < 0 && ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
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if (ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY) {
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// Also send close notify back
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disconnect_from_peer();
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} else {
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_cleanup();
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status = STATUS_ERROR;
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SSLContextMbedTLS::print_mbedtls_error(ret);
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}
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}
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}
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int PacketPeerMbedDTLS::get_available_packet_count() const {
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ERR_FAIL_COND_V(status != STATUS_CONNECTED, 0);
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return mbedtls_ssl_get_bytes_avail(&(ssl_ctx->ssl)) > 0 ? 1 : 0;
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}
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int PacketPeerMbedDTLS::get_max_packet_size() const {
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return 488; // 512 (UDP in Godot) - 24 (DTLS header)
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}
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PacketPeerMbedDTLS::PacketPeerMbedDTLS() {
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ssl_ctx.instance();
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status = STATUS_DISCONNECTED;
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}
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PacketPeerMbedDTLS::~PacketPeerMbedDTLS() {
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disconnect_from_peer();
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}
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void PacketPeerMbedDTLS::disconnect_from_peer() {
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if (status != STATUS_CONNECTED && status != STATUS_HANDSHAKING)
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return;
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if (status == STATUS_CONNECTED) {
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int ret = 0;
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// Send SSL close notification, blocking, but ignore other errors.
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do
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ret = mbedtls_ssl_close_notify(ssl_ctx->get_context());
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while (ret == MBEDTLS_ERR_SSL_WANT_WRITE);
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}
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_cleanup();
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}
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PacketPeerMbedDTLS::Status PacketPeerMbedDTLS::get_status() const {
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return status;
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}
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PacketPeerDTLS *PacketPeerMbedDTLS::_create_func() {
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return memnew(PacketPeerMbedDTLS);
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}
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void PacketPeerMbedDTLS::initialize_dtls() {
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_create = _create_func;
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available = true;
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}
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void PacketPeerMbedDTLS::finalize_dtls() {
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_create = nullptr;
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available = false;
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}
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