diff options
Diffstat (limited to 'modules/mbedtls/stream_peer_mbedtls.cpp')
| -rwxr-xr-x | modules/mbedtls/stream_peer_mbedtls.cpp | 330 |
1 files changed, 330 insertions, 0 deletions
diff --git a/modules/mbedtls/stream_peer_mbedtls.cpp b/modules/mbedtls/stream_peer_mbedtls.cpp new file mode 100755 index 0000000000..e2eb19fc74 --- /dev/null +++ b/modules/mbedtls/stream_peer_mbedtls.cpp @@ -0,0 +1,330 @@ +/*************************************************************************/ +/* stream_peer_mbed_tls.cpp */ +/*************************************************************************/ +/* This file is part of: */ +/* GODOT ENGINE */ +/* https://godotengine.org */ +/*************************************************************************/ +/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur. */ +/* Copyright (c) 2014-2019 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_mbedtls.h" + +#include "core/io/stream_peer_tcp.h" +#include "core/os/file_access.h" + +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; +} + +void StreamPeerMbedTLS::_cleanup() { + + ssl_ctx->clear(); + base = Ref<StreamPeer>(); + status = STATUS_DISCONNECTED; +} + +Error StreamPeerMbedTLS::_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) { + // An error occurred. + ERR_PRINTS("TLS handshake error: " + itos(ret)); + _print_error(ret); + disconnect_from_stream(); + status = STATUS_ERROR; + return FAILED; + } + + // Handshake is still in progress. + if (!blocking_handshake) { + // Will retry via poll later + return OK; + } + } + + status = STATUS_CONNECTED; + return OK; +} + +Error StreamPeerMbedTLS::connect_to_stream(Ref<StreamPeer> p_base, bool p_validate_certs, const String &p_for_hostname, Ref<X509Certificate> p_ca_certs) { + + ERR_FAIL_COND_V(p_base.is_null(), 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_STREAM, 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, NULL); + + status = STATUS_HANDSHAKING; + + if ((ret = _do_handshake()) != OK) { + status = STATUS_ERROR_HOSTNAME_MISMATCH; + return FAILED; + } + + return OK; +} + +Error StreamPeerMbedTLS::accept_stream(Ref<StreamPeer> p_base, Ref<CryptoKey> p_key, Ref<X509Certificate> p_cert, Ref<X509Certificate> p_ca_chain) { + + ERR_FAIL_COND_V(p_base.is_null(), ERR_INVALID_PARAMETER); + + Error err = ssl_ctx->init_server(MBEDTLS_SSL_TRANSPORT_STREAM, MBEDTLS_SSL_VERIFY_NONE, p_key, p_cert); + ERR_FAIL_COND_V(err != OK, err); + + base = p_base; + + mbedtls_ssl_set_bio(ssl_ctx->get_context(), this, bio_send, bio_recv, NULL); + + status = STATUS_HANDSHAKING; + + if ((err = _do_handshake()) != OK) { + return FAILED; + } + + status = STATUS_CONNECTED; + return OK; +} +Error StreamPeerMbedTLS::put_data(const uint8_t *p_data, int p_bytes) { + + ERR_FAIL_COND_V(status != STATUS_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(status != STATUS_CONNECTED, ERR_UNCONFIGURED); + + r_sent = 0; + + if (p_bytes == 0) + return OK; + + int ret = mbedtls_ssl_write(ssl_ctx->get_context(), p_data, p_bytes); + if (ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE) { + // Non blocking IO + ret = 0; + } else if (ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY) { + // Clean close + disconnect_from_stream(); + return ERR_FILE_EOF; + } 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(status != STATUS_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(status != STATUS_CONNECTED, ERR_UNCONFIGURED); + + r_received = 0; + + int ret = mbedtls_ssl_read(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 == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY) { + // Clean close + disconnect_from_stream(); + return ERR_FILE_EOF; + } 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(status != STATUS_CONNECTED && status != STATUS_HANDSHAKING); + ERR_FAIL_COND(!base.is_valid()); + + if (status == STATUS_HANDSHAKING) { + _do_handshake(); + return; + } + + // We could pass NULL as second parameter, but some behaviour sanitizers doesn't seem to like that. + // Passing a 1 byte buffer to workaround it. + uint8_t byte; + int ret = mbedtls_ssl_read(ssl_ctx->get_context(), &byte, 0); + + if (ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE) { + // Nothing to read/write (non blocking IO) + } else if (ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY) { + // Clean close (disconnect) + disconnect_from_stream(); + return; + } else if (ret < 0) { + _print_error(ret); + disconnect_from_stream(); + return; + } + + Ref<StreamPeerTCP> tcp = base; + if (tcp.is_valid() && tcp->get_status() != StreamPeerTCP::STATUS_CONNECTED) { + disconnect_from_stream(); + return; + } +} + +int StreamPeerMbedTLS::get_available_bytes() const { + + ERR_FAIL_COND_V(status != STATUS_CONNECTED, 0); + + return mbedtls_ssl_get_bytes_avail(&(ssl_ctx->ssl)); +} +StreamPeerMbedTLS::StreamPeerMbedTLS() { + + ssl_ctx.instance(); + status = STATUS_DISCONNECTED; +} + +StreamPeerMbedTLS::~StreamPeerMbedTLS() { + disconnect_from_stream(); +} + +void StreamPeerMbedTLS::disconnect_from_stream() { + + if (status != STATUS_CONNECTED && status != STATUS_HANDSHAKING) + return; + + Ref<StreamPeerTCP> tcp = base; + if (tcp.is_valid() && tcp->get_status() == StreamPeerTCP::STATUS_CONNECTED) { + // We are still connected on the socket, try to send close notify. + mbedtls_ssl_close_notify(ssl_ctx->get_context()); + } + + _cleanup(); +} + +StreamPeerMbedTLS::Status StreamPeerMbedTLS::get_status() const { + + return status; +} + +StreamPeerSSL *StreamPeerMbedTLS::_create_func() { + + return memnew(StreamPeerMbedTLS); +} + +void StreamPeerMbedTLS::initialize_ssl() { + + _create = _create_func; + available = true; +} + +void StreamPeerMbedTLS::finalize_ssl() { + + available = false; + _create = NULL; +} |