godot/modules/mbedtls/stream_peer_mbedtls.cpp
2020-02-16 01:11:30 +01:00

324 lines
9 KiB
C++
Executable file

/*************************************************************************/
/* stream_peer_mbedtls.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2020 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"
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_PRINT("TLS handshake error: " + itos(ret));
SSLContextMbedTLS::print_mbedtls_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 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 (_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 (_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) {
SSLContextMbedTLS::print_mbedtls_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) {
SSLContextMbedTLS::print_mbedtls_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) {
SSLContextMbedTLS::print_mbedtls_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;
}