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329 lines
9 KiB
C++
Executable file
329 lines
9 KiB
C++
Executable file
/*************************************************************************/
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/* stream_peer_mbedtls.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 "stream_peer_mbedtls.h"
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#include "core/io/stream_peer_tcp.h"
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#include "core/os/file_access.h"
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void _print_error(int ret) {
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printf("mbedtls error: returned -0x%x\n\n", -ret);
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fflush(stdout);
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}
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int StreamPeerMbedTLS::bio_send(void *ctx, const unsigned char *buf, size_t len) {
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if (buf == NULL || len <= 0) return 0;
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StreamPeerMbedTLS *sp = (StreamPeerMbedTLS *)ctx;
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ERR_FAIL_COND_V(sp == NULL, 0);
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int sent;
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Error err = sp->base->put_partial_data((const uint8_t *)buf, len, sent);
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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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if (sent == 0) {
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return MBEDTLS_ERR_SSL_WANT_WRITE;
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}
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return sent;
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}
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int StreamPeerMbedTLS::bio_recv(void *ctx, unsigned char *buf, size_t len) {
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if (buf == NULL || len <= 0) return 0;
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StreamPeerMbedTLS *sp = (StreamPeerMbedTLS *)ctx;
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ERR_FAIL_COND_V(sp == NULL, 0);
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int got;
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Error err = sp->base->get_partial_data((uint8_t *)buf, len, got);
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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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if (got == 0) {
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return MBEDTLS_ERR_SSL_WANT_READ;
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}
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return got;
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}
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void StreamPeerMbedTLS::_cleanup() {
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ssl_ctx->clear();
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base = Ref<StreamPeer>();
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status = STATUS_DISCONNECTED;
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}
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Error StreamPeerMbedTLS::_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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// An error occurred.
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ERR_PRINTS("TLS handshake error: " + itos(ret));
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_print_error(ret);
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disconnect_from_stream();
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status = STATUS_ERROR;
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return FAILED;
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}
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// Handshake is still in progress.
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if (!blocking_handshake) {
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// Will retry via poll later
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return OK;
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}
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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 StreamPeerMbedTLS::connect_to_stream(Ref<StreamPeer> 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_null(), ERR_INVALID_PARAMETER);
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base = p_base;
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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_STREAM, 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, NULL);
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status = STATUS_HANDSHAKING;
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if (_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 StreamPeerMbedTLS::accept_stream(Ref<StreamPeer> p_base, Ref<CryptoKey> p_key, Ref<X509Certificate> p_cert, Ref<X509Certificate> p_ca_chain) {
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ERR_FAIL_COND_V(p_base.is_null(), ERR_INVALID_PARAMETER);
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Error err = ssl_ctx->init_server(MBEDTLS_SSL_TRANSPORT_STREAM, MBEDTLS_SSL_VERIFY_NONE, p_key, p_cert);
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ERR_FAIL_COND_V(err != OK, err);
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base = p_base;
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mbedtls_ssl_set_bio(ssl_ctx->get_context(), this, bio_send, bio_recv, NULL);
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status = STATUS_HANDSHAKING;
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if (_do_handshake() != OK) {
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return FAILED;
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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 StreamPeerMbedTLS::put_data(const uint8_t *p_data, int p_bytes) {
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ERR_FAIL_COND_V(status != STATUS_CONNECTED, ERR_UNCONFIGURED);
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Error err;
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int sent = 0;
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while (p_bytes > 0) {
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err = put_partial_data(p_data, p_bytes, sent);
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if (err != OK) {
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return err;
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}
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p_data += sent;
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p_bytes -= sent;
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}
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return OK;
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}
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Error StreamPeerMbedTLS::put_partial_data(const uint8_t *p_data, int p_bytes, int &r_sent) {
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ERR_FAIL_COND_V(status != STATUS_CONNECTED, ERR_UNCONFIGURED);
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r_sent = 0;
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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_data, p_bytes);
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if (ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE) {
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// Non blocking IO
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ret = 0;
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} else if (ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY) {
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// Clean close
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disconnect_from_stream();
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return ERR_FILE_EOF;
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} else if (ret <= 0) {
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_print_error(ret);
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disconnect_from_stream();
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return ERR_CONNECTION_ERROR;
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}
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r_sent = ret;
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return OK;
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}
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Error StreamPeerMbedTLS::get_data(uint8_t *p_buffer, int p_bytes) {
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ERR_FAIL_COND_V(status != STATUS_CONNECTED, ERR_UNCONFIGURED);
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Error err;
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int got = 0;
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while (p_bytes > 0) {
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err = get_partial_data(p_buffer, p_bytes, got);
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if (err != OK) {
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return err;
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}
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p_buffer += got;
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p_bytes -= got;
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}
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return OK;
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}
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Error StreamPeerMbedTLS::get_partial_data(uint8_t *p_buffer, int p_bytes, int &r_received) {
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ERR_FAIL_COND_V(status != STATUS_CONNECTED, ERR_UNCONFIGURED);
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r_received = 0;
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int ret = mbedtls_ssl_read(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 == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY) {
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// Clean close
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disconnect_from_stream();
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return ERR_FILE_EOF;
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} else if (ret <= 0) {
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_print_error(ret);
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disconnect_from_stream();
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return ERR_CONNECTION_ERROR;
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}
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r_received = ret;
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return OK;
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}
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void StreamPeerMbedTLS::poll() {
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ERR_FAIL_COND(status != STATUS_CONNECTED && status != STATUS_HANDSHAKING);
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ERR_FAIL_COND(!base.is_valid());
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if (status == STATUS_HANDSHAKING) {
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_do_handshake();
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return;
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}
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// We could pass NULL as second parameter, but some behaviour sanitizers doesn't seem to like that.
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// Passing a 1 byte buffer to workaround it.
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uint8_t byte;
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int ret = mbedtls_ssl_read(ssl_ctx->get_context(), &byte, 0);
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if (ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE) {
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// Nothing to read/write (non blocking IO)
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} else if (ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY) {
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// Clean close (disconnect)
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disconnect_from_stream();
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return;
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} else if (ret < 0) {
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_print_error(ret);
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disconnect_from_stream();
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return;
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}
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Ref<StreamPeerTCP> tcp = base;
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if (tcp.is_valid() && tcp->get_status() != StreamPeerTCP::STATUS_CONNECTED) {
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disconnect_from_stream();
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return;
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}
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}
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int StreamPeerMbedTLS::get_available_bytes() 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));
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}
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StreamPeerMbedTLS::StreamPeerMbedTLS() {
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ssl_ctx.instance();
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status = STATUS_DISCONNECTED;
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}
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StreamPeerMbedTLS::~StreamPeerMbedTLS() {
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disconnect_from_stream();
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}
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void StreamPeerMbedTLS::disconnect_from_stream() {
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if (status != STATUS_CONNECTED && status != STATUS_HANDSHAKING)
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return;
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Ref<StreamPeerTCP> tcp = base;
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if (tcp.is_valid() && tcp->get_status() == StreamPeerTCP::STATUS_CONNECTED) {
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// We are still connected on the socket, try to send close notify.
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mbedtls_ssl_close_notify(ssl_ctx->get_context());
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}
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_cleanup();
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}
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StreamPeerMbedTLS::Status StreamPeerMbedTLS::get_status() const {
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return status;
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}
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StreamPeerSSL *StreamPeerMbedTLS::_create_func() {
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return memnew(StreamPeerMbedTLS);
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}
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void StreamPeerMbedTLS::initialize_ssl() {
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_create = _create_func;
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available = true;
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}
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void StreamPeerMbedTLS::finalize_ssl() {
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available = false;
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_create = NULL;
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}
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