diff options
Diffstat (limited to 'modules/mbedtls/stream_peer_mbed_tls.cpp')
| -rwxr-xr-x | modules/mbedtls/stream_peer_mbed_tls.cpp | 325 |
1 files changed, 325 insertions, 0 deletions
diff --git a/modules/mbedtls/stream_peer_mbed_tls.cpp b/modules/mbedtls/stream_peer_mbed_tls.cpp new file mode 100755 index 0000000000..4135eb40ff --- /dev/null +++ b/modules/mbedtls/stream_peer_mbed_tls.cpp @@ -0,0 +1,325 @@ +/*************************************************************************/ +/* stream_peer_openssl.cpp */ +/*************************************************************************/ +/* This file is part of: */ +/* GODOT ENGINE */ +/* https://godotengine.org */ +/*************************************************************************/ +/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur. */ +/* Copyright (c) 2014-2018 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 "stream_peer_mbed_tls.h" + +static void my_debug(void *ctx, int level, + const char *file, int line, + const char *str) { + + printf("%s:%04d: %s", file, line, str); + fflush(stdout); +} + +void _print_error(int ret) { + printf("mbedtls error: returned -0x%x\n\n", -ret); + fflush(stdout); +} + +int StreamPeerMbedTLS::bio_send(void *ctx, const unsigned char *buf, size_t len) { + + if (buf == NULL || len <= 0) return 0; + + StreamPeerMbedTLS *sp = (StreamPeerMbedTLS *)ctx; + + ERR_FAIL_COND_V(sp == NULL, 0); + + int sent; + Error err = sp->base->put_partial_data((const uint8_t *)buf, len, sent); + if (err != OK) { + return MBEDTLS_ERR_SSL_INTERNAL_ERROR; + } + if (sent == 0) { + return MBEDTLS_ERR_SSL_WANT_WRITE; + } + return sent; +} + +int StreamPeerMbedTLS::bio_recv(void *ctx, unsigned char *buf, size_t len) { + + if (buf == NULL || len <= 0) return 0; + + StreamPeerMbedTLS *sp = (StreamPeerMbedTLS *)ctx; + + ERR_FAIL_COND_V(sp == NULL, 0); + + int got; + Error err = sp->base->get_partial_data((uint8_t *)buf, len, got); + if (err != OK) { + return MBEDTLS_ERR_SSL_INTERNAL_ERROR; + } + if (got == 0) { + return MBEDTLS_ERR_SSL_WANT_READ; + } + return got; +} + +Error StreamPeerMbedTLS::connect_to_stream(Ref<StreamPeer> p_base, bool p_validate_certs, const String &p_for_hostname) { + + base = p_base; + int ret = 0; + int authmode = p_validate_certs ? MBEDTLS_SSL_VERIFY_REQUIRED : MBEDTLS_SSL_VERIFY_NONE; + + mbedtls_ssl_init(&ssl); + mbedtls_ssl_config_init(&conf); + mbedtls_ctr_drbg_init(&ctr_drbg); + mbedtls_entropy_init(&entropy); + + ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy, NULL, 0); + if (ret != 0) { + ERR_PRINTS(" failed\n ! mbedtls_ctr_drbg_seed returned an error" + itos(ret)); + return FAILED; + } + + mbedtls_ssl_config_defaults(&conf, + MBEDTLS_SSL_IS_CLIENT, + MBEDTLS_SSL_TRANSPORT_STREAM, + MBEDTLS_SSL_PRESET_DEFAULT); + + mbedtls_ssl_conf_authmode(&conf, authmode); + mbedtls_ssl_conf_ca_chain(&conf, &cacert, NULL); + mbedtls_ssl_conf_rng(&conf, mbedtls_ctr_drbg_random, &ctr_drbg); + mbedtls_ssl_conf_dbg(&conf, my_debug, stdout); + mbedtls_ssl_setup(&ssl, &conf); + mbedtls_ssl_set_hostname(&ssl, p_for_hostname.utf8().get_data()); + + mbedtls_ssl_set_bio(&ssl, this, bio_send, bio_recv, NULL); + + while ((ret = mbedtls_ssl_handshake(&ssl)) != 0) { + if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) { + ERR_PRINTS("TLS handshake error: " + itos(ret)); + _print_error(ret); + status = STATUS_ERROR_HOSTNAME_MISMATCH; + return FAILED; + } + } + + connected = true; + status = STATUS_CONNECTED; + + return OK; +} + +Error StreamPeerMbedTLS::accept_stream(Ref<StreamPeer> p_base) { + + return ERR_UNAVAILABLE; +} + +Error StreamPeerMbedTLS::put_data(const uint8_t *p_data, int p_bytes) { + + ERR_FAIL_COND_V(!connected, ERR_UNCONFIGURED); + + Error err; + int sent = 0; + + while (p_bytes > 0) { + err = put_partial_data(p_data, p_bytes, sent); + + if (err != OK) { + return err; + } + + p_data += sent; + p_bytes -= sent; + } + + return OK; +} + +Error StreamPeerMbedTLS::put_partial_data(const uint8_t *p_data, int p_bytes, int &r_sent) { + + ERR_FAIL_COND_V(!connected, ERR_UNCONFIGURED); + + r_sent = 0; + + if (p_bytes == 0) + return OK; + + int ret = mbedtls_ssl_write(&ssl, p_data, p_bytes); + if (ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE) { + ret = 0; // non blocking io + } else if (ret <= 0) { + _print_error(ret); + disconnect_from_stream(); + return ERR_CONNECTION_ERROR; + } + + r_sent = ret; + return OK; +} + +Error StreamPeerMbedTLS::get_data(uint8_t *p_buffer, int p_bytes) { + + ERR_FAIL_COND_V(!connected, ERR_UNCONFIGURED); + + Error err; + + int got = 0; + while (p_bytes > 0) { + + err = get_partial_data(p_buffer, p_bytes, got); + + if (err != OK) { + return err; + } + + p_buffer += got; + p_bytes -= got; + } + + return OK; +} + +Error StreamPeerMbedTLS::get_partial_data(uint8_t *p_buffer, int p_bytes, int &r_received) { + + ERR_FAIL_COND_V(!connected, ERR_UNCONFIGURED); + + r_received = 0; + + int ret = mbedtls_ssl_read(&ssl, 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) { + _print_error(ret); + disconnect_from_stream(); + return ERR_CONNECTION_ERROR; + } + + r_received = ret; + return OK; +} + +void StreamPeerMbedTLS::poll() { + + ERR_FAIL_COND(!connected); + ERR_FAIL_COND(!base.is_valid()); + + int ret = mbedtls_ssl_read(&ssl, NULL, 0); + + if (ret < 0 && ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) { + _print_error(ret); + disconnect_from_stream(); + return; + } +} + +int StreamPeerMbedTLS::get_available_bytes() const { + + ERR_FAIL_COND_V(!connected, 0); + + return mbedtls_ssl_get_bytes_avail(&ssl); +} +StreamPeerMbedTLS::StreamPeerMbedTLS() { + + connected = false; + status = STATUS_DISCONNECTED; +} + +StreamPeerMbedTLS::~StreamPeerMbedTLS() { + disconnect_from_stream(); +} + +void StreamPeerMbedTLS::disconnect_from_stream() { + + if (!connected) + return; + + mbedtls_ssl_free(&ssl); + mbedtls_ssl_config_free(&conf); + mbedtls_ctr_drbg_free(&ctr_drbg); + mbedtls_entropy_free(&entropy); + + base = Ref<StreamPeer>(); + connected = false; + status = STATUS_DISCONNECTED; +} + +StreamPeerMbedTLS::Status StreamPeerMbedTLS::get_status() const { + + return status; +} + +StreamPeerSSL *StreamPeerMbedTLS::_create_func() { + + return memnew(StreamPeerMbedTLS); +} + +mbedtls_x509_crt StreamPeerMbedTLS::cacert; + +void StreamPeerMbedTLS::_load_certs(const PoolByteArray &p_array) { + int arr_len = p_array.size(); + PoolByteArray::Read r = p_array.read(); + int err = mbedtls_x509_crt_parse(&cacert, &r[0], arr_len); + if (err != 0) { + WARN_PRINTS("Error parsing some certificates: " + itos(err)); + } +} + +void StreamPeerMbedTLS::initialize_ssl() { + + _create = _create_func; + load_certs_func = _load_certs; + + mbedtls_x509_crt_init(&cacert); + +#ifdef DEBUG_ENABLED + mbedtls_debug_set_threshold(1); +#endif + + String certs_path = GLOBAL_DEF("network/ssl/certificates", ""); + ProjectSettings::get_singleton()->set_custom_property_info("network/ssl/certificates", PropertyInfo(Variant::STRING, "network/ssl/certificates", PROPERTY_HINT_FILE, "*.crt")); + + if (certs_path != "") { + + FileAccess *f = FileAccess::open(certs_path, FileAccess::READ); + if (f) { + PoolByteArray arr; + int flen = f->get_len(); + arr.resize(flen + 1); + { + PoolByteArray::Write w = arr.write(); + f->get_buffer(w.ptr(), flen); + w[flen] = 0; //end f string + } + + memdelete(f); + + _load_certs(arr); + print_line("Loaded certs from '" + certs_path); + } + } + + available = true; +} + +void StreamPeerMbedTLS::finalize_ssl() { + + mbedtls_x509_crt_free(&cacert); +} |