0e56377e96
Note, it will only used by the Editor, not when running the game. This allows package maintainer to compile Godot to use system installed certificates when accessing the AssetLib.
329 lines
8.6 KiB
C++
Executable file
329 lines
8.6 KiB
C++
Executable file
/*************************************************************************/
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/* stream_peer_openssl.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) 2007-2018 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2018 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_mbed_tls.h"
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#include "core/os/file_access.h"
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#include "mbedtls/platform_util.h"
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static void my_debug(void *ctx, int level,
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const char *file, int line,
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const char *str) {
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printf("%s:%04d: %s", file, line, str);
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fflush(stdout);
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}
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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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mbedtls_ssl_free(&ssl);
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mbedtls_ssl_config_free(&conf);
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mbedtls_ctr_drbg_free(&ctr_drbg);
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mbedtls_entropy_free(&entropy);
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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)) != 0) {
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if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
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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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} else 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) {
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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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mbedtls_ssl_init(&ssl);
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mbedtls_ssl_config_init(&conf);
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mbedtls_ctr_drbg_init(&ctr_drbg);
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mbedtls_entropy_init(&entropy);
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ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy, NULL, 0);
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if (ret != 0) {
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ERR_PRINTS(" failed\n ! mbedtls_ctr_drbg_seed returned an error" + itos(ret));
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_cleanup();
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return FAILED;
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}
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mbedtls_ssl_config_defaults(&conf,
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MBEDTLS_SSL_IS_CLIENT,
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MBEDTLS_SSL_TRANSPORT_STREAM,
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MBEDTLS_SSL_PRESET_DEFAULT);
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mbedtls_ssl_conf_authmode(&conf, authmode);
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mbedtls_ssl_conf_ca_chain(&conf, &cacert, NULL);
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mbedtls_ssl_conf_rng(&conf, mbedtls_ctr_drbg_random, &ctr_drbg);
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mbedtls_ssl_conf_dbg(&conf, my_debug, stdout);
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mbedtls_ssl_setup(&ssl, &conf);
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mbedtls_ssl_set_hostname(&ssl, p_for_hostname.utf8().get_data());
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mbedtls_ssl_set_bio(&ssl, this, bio_send, bio_recv, NULL);
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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 StreamPeerMbedTLS::accept_stream(Ref<StreamPeer> p_base) {
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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, 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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ret = 0; // non blocking io
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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, 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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_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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int ret = mbedtls_ssl_read(&ssl, NULL, 0);
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if (ret < 0 && ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
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_print_error(ret);
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disconnect_from_stream();
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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);
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}
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StreamPeerMbedTLS::StreamPeerMbedTLS() {
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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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_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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mbedtls_x509_crt StreamPeerMbedTLS::cacert;
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void StreamPeerMbedTLS::_load_certs(const PoolByteArray &p_array) {
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int arr_len = p_array.size();
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PoolByteArray::Read r = p_array.read();
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int err = mbedtls_x509_crt_parse(&cacert, &r[0], arr_len);
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if (err != 0) {
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WARN_PRINTS("Error parsing some certificates: " + itos(err));
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}
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}
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void StreamPeerMbedTLS::initialize_ssl() {
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_create = _create_func;
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load_certs_func = _load_certs;
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mbedtls_x509_crt_init(&cacert);
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#ifdef DEBUG_ENABLED
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mbedtls_debug_set_threshold(1);
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#endif
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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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load_certs_func = NULL;
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mbedtls_x509_crt_free(&cacert);
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}
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