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New PacketPeerDTLS and DTLSServer classes.

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Custom instance implementation via the mbedtls module.
This commit is contained in:
Fabio Alessandrelli 2019-08-21 22:52:24 +02:00
parent dbbd836931
commit 35a9f0fe64
12 changed files with 849 additions and 3 deletions
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54
core/io/dtls_server.cpp Normal file
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@ -0,0 +1,54 @@
/*************************************************************************/
/* dtls_server.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 "dtls_server.h"
#include "core/os/file_access.h"
#include "core/project_settings.h"
DTLSServer *(*DTLSServer::_create)() = NULL;
bool DTLSServer::available = false;
DTLSServer *DTLSServer::create() {
return _create();
}
bool DTLSServer::is_available() {
return available;
}
void DTLSServer::_bind_methods() {
ClassDB::bind_method(D_METHOD("setup", "key", "certificate", "chain"), &DTLSServer::setup, DEFVAL(Ref<X509Certificate>()));
ClassDB::bind_method(D_METHOD("take_connection", "udp_peer"), &DTLSServer::take_connection);
}
DTLSServer::DTLSServer() {
}

57
core/io/dtls_server.h Normal file
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@ -0,0 +1,57 @@
/*************************************************************************/
/* dtls_server.h */
/*************************************************************************/
/* 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. */
/*************************************************************************/
#ifndef DTLS_SERVER_H
#define DTLS_SERVER_H
#include "core/io/net_socket.h"
#include "core/io/packet_peer_dtls.h"
class DTLSServer : public Reference {
GDCLASS(DTLSServer, Reference);
protected:
static DTLSServer *(*_create)();
static void _bind_methods();
static bool available;
public:
static bool is_available();
static DTLSServer *create();
virtual Error setup(Ref<CryptoKey> p_key, Ref<X509Certificate> p_cert, Ref<X509Certificate> p_ca_chain = Ref<X509Certificate>()) = 0;
virtual void stop() = 0;
virtual Ref<PacketPeerDTLS> take_connection(Ref<PacketPeerUDP> p_peer) = 0;
DTLSServer();
};
#endif // DTLS_SERVER_H

62
core/io/packet_peer_dtls.cpp Normal file
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@ -0,0 +1,62 @@
/*************************************************************************/
/* packet_peer_dtls.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 "packet_peer_dtls.h"
#include "core/os/file_access.h"
#include "core/project_settings.h"
PacketPeerDTLS *(*PacketPeerDTLS::_create)() = NULL;
bool PacketPeerDTLS::available = false;
PacketPeerDTLS *PacketPeerDTLS::create() {
return _create();
}
bool PacketPeerDTLS::is_available() {
return available;
}
void PacketPeerDTLS::_bind_methods() {
ClassDB::bind_method(D_METHOD("poll"), &PacketPeerDTLS::poll);
ClassDB::bind_method(D_METHOD("connect_to_peer", "packet_peer", "validate_certs", "for_hostname", "valid_certificate"), &PacketPeerDTLS::connect_to_peer, DEFVAL(true), DEFVAL(String()), DEFVAL(Ref<X509Certificate>()));
ClassDB::bind_method(D_METHOD("get_status"), &PacketPeerDTLS::get_status);
ClassDB::bind_method(D_METHOD("disconnect_from_peer"), &PacketPeerDTLS::disconnect_from_peer);
BIND_ENUM_CONSTANT(STATUS_DISCONNECTED);
BIND_ENUM_CONSTANT(STATUS_HANDSHAKING);
BIND_ENUM_CONSTANT(STATUS_CONNECTED);
BIND_ENUM_CONSTANT(STATUS_ERROR);
BIND_ENUM_CONSTANT(STATUS_ERROR_HOSTNAME_MISMATCH);
}
PacketPeerDTLS::PacketPeerDTLS() {
}

68
core/io/packet_peer_dtls.h Normal file
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@ -0,0 +1,68 @@
/*************************************************************************/
/* packet_peer_dtls.h */
/*************************************************************************/
/* 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. */
/*************************************************************************/
#ifndef PACKET_PEER_DTLS_H
#define PACKET_PEER_DTLS_H
#include "core/crypto/crypto.h"
#include "core/io/packet_peer_udp.h"
class PacketPeerDTLS : public PacketPeer {
GDCLASS(PacketPeerDTLS, PacketPeer);
protected:
static PacketPeerDTLS *(*_create)();
static void _bind_methods();
static bool available;
public:
enum Status {
STATUS_DISCONNECTED,
STATUS_HANDSHAKING,
STATUS_CONNECTED,
STATUS_ERROR,
STATUS_ERROR_HOSTNAME_MISMATCH
};
virtual void poll() = 0;
virtual Error connect_to_peer(Ref<PacketPeerUDP> p_base, bool p_validate_certs = true, const String &p_for_hostname = String(), Ref<X509Certificate> p_ca_certs = Ref<X509Certificate>()) = 0;
virtual void disconnect_from_peer() = 0;
virtual Status get_status() const = 0;
static PacketPeerDTLS *create();
static bool is_available();
PacketPeerDTLS();
};
VARIANT_ENUM_CAST(PacketPeerDTLS::Status);
#endif // PACKET_PEER_DTLS_H

4
core/register_core_types.cpp
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@ -40,12 +40,14 @@
#include "core/func_ref.h"
#include "core/input_map.h"
#include "core/io/config_file.h"
#include "core/io/dtls_server.h"
#include "core/io/http_client.h"
#include "core/io/image_loader.h"
#include "core/io/marshalls.h"
#include "core/io/multiplayer_api.h"
#include "core/io/networked_multiplayer_peer.h"
#include "core/io/packet_peer.h"
#include "core/io/packet_peer_dtls.h"
#include "core/io/packet_peer_udp.h"
#include "core/io/pck_packer.h"
#include "core/io/resource_format_binary.h"
@ -157,6 +159,8 @@ void register_core_types() {
ClassDB::register_class<TCP_Server>();
ClassDB::register_class<PacketPeerUDP>();
ClassDB::register_class<UDPServer>();
ClassDB::register_custom_instance_class<PacketPeerDTLS>();
ClassDB::register_custom_instance_class<DTLSServer>();
// Crypto
ClassDB::register_class<HashingContext>();

78
modules/mbedtls/dtls_server_mbedtls.cpp Normal file
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/*************************************************************************/
/* dtls_server_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 "dtls_server_mbedtls.h"
#include "packet_peer_mbed_dtls.h"
Error DTLSServerMbedTLS::setup(Ref<CryptoKey> p_key, Ref<X509Certificate> p_cert, Ref<X509Certificate> p_ca_chain) {
ERR_FAIL_COND_V(_cookies->setup() != OK, ERR_ALREADY_IN_USE);
_key = p_key;
_cert = p_cert;
_ca_chain = p_ca_chain;
return OK;
}
void DTLSServerMbedTLS::stop() {
_cookies->clear();
}
Ref<PacketPeerDTLS> DTLSServerMbedTLS::take_connection(Ref<PacketPeerUDP> p_udp_peer) {
Ref<PacketPeerMbedDTLS> out;
out.instance();
ERR_FAIL_COND_V(!out.is_valid(), out);
ERR_FAIL_COND_V(!p_udp_peer.is_valid(), out);
out->accept_peer(p_udp_peer, _key, _cert, _ca_chain, _cookies);
return out;
}
DTLSServer *DTLSServerMbedTLS::_create_func() {
return memnew(DTLSServerMbedTLS);
}
void DTLSServerMbedTLS::initialize() {
_create = _create_func;
available = true;
}
void DTLSServerMbedTLS::finalize() {
_create = NULL;
available = false;
}
DTLSServerMbedTLS::DTLSServerMbedTLS() {
_cookies.instance();
}
DTLSServerMbedTLS::~DTLSServerMbedTLS() {
stop();
}

58
modules/mbedtls/dtls_server_mbedtls.h Normal file
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@ -0,0 +1,58 @@
/*************************************************************************/
/* dtls_server_mbedtls.h */
/*************************************************************************/
/* 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. */
/*************************************************************************/
#ifndef MBED_DTLS_SERVER_H
#define MBED_DTLS_SERVER_H
#include "core/io/dtls_server.h"
#include "ssl_context_mbedtls.h"
class DTLSServerMbedTLS : public DTLSServer {
private:
static DTLSServer *_create_func();
Ref<CryptoKey> _key;
Ref<X509Certificate> _cert;
Ref<X509Certificate> _ca_chain;
Ref<CookieContextMbedTLS> _cookies;
public:
static void initialize();
static void finalize();
virtual Error setup(Ref<CryptoKey> p_key, Ref<X509Certificate> p_cert, Ref<X509Certificate> p_ca_chain = Ref<X509Certificate>());
virtual void stop();
virtual Ref<PacketPeerDTLS> take_connection(Ref<PacketPeerUDP> p_peer);
DTLSServerMbedTLS();
~DTLSServerMbedTLS();
};
#endif // MBED_DTLS_SERVER_H

297
modules/mbedtls/packet_peer_mbed_dtls.cpp Executable file
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@ -0,0 +1,297 @@
/*************************************************************************/
/* packet_peer_mbed_dtls.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 "packet_peer_mbed_dtls.h"
#include "mbedtls/platform_util.h"
#include "core/io/stream_peer_ssl.h"
#include "core/os/file_access.h"
int PacketPeerMbedDTLS::bio_send(void *ctx, const unsigned char *buf, size_t len) {
if (buf == NULL || len <= 0) return 0;
PacketPeerMbedDTLS *sp = (PacketPeerMbedDTLS *)ctx;
ERR_FAIL_COND_V(sp == NULL, 0);
Error err = sp->base->put_packet((const uint8_t *)buf, len);
if (err == ERR_BUSY) {
return MBEDTLS_ERR_SSL_WANT_WRITE;
} else if (err != OK) {
ERR_FAIL_V(MBEDTLS_ERR_SSL_INTERNAL_ERROR);
}
return len;
}
int PacketPeerMbedDTLS::bio_recv(void *ctx, unsigned char *buf, size_t len) {
if (buf == NULL || len <= 0) return 0;
PacketPeerMbedDTLS *sp = (PacketPeerMbedDTLS *)ctx;
ERR_FAIL_COND_V(sp == NULL, 0);
int pc = sp->base->get_available_packet_count();
if (pc == 0) {
return MBEDTLS_ERR_SSL_WANT_READ;
} else if (pc < 0) {
ERR_FAIL_V(MBEDTLS_ERR_SSL_INTERNAL_ERROR);
}
const uint8_t *buffer;
int buffer_size = 0;
Error err = sp->base->get_packet(&buffer, buffer_size);
if (err != OK) {
return MBEDTLS_ERR_SSL_INTERNAL_ERROR;
}
copymem(buf, buffer, buffer_size);
return buffer_size;
}
void PacketPeerMbedDTLS::_cleanup() {
ssl_ctx->clear();
base = Ref<PacketPeer>();
status = STATUS_DISCONNECTED;
}
int PacketPeerMbedDTLS::_set_cookie() {
// Setup DTLS session cookie for this client
uint8_t client_id[18];
IP_Address addr = base->get_packet_address();
uint16_t port = base->get_packet_port();
copymem(client_id, addr.get_ipv6(), 16);
copymem(&client_id[16], (uint8_t *)&port, 2);
return mbedtls_ssl_set_client_transport_id(ssl_ctx->get_context(), client_id, 18);
}
Error PacketPeerMbedDTLS::_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) {
if (ret != MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED) {
ERR_PRINT("TLS handshake error: " + itos(ret));
SSLContextMbedTLS::print_mbedtls_error(ret);
}
_cleanup();
status = STATUS_ERROR;
return FAILED;
}
// Will retry via poll later
return OK;
}
status = STATUS_CONNECTED;
return OK;
}
Error PacketPeerMbedDTLS::connect_to_peer(Ref<PacketPeerUDP> p_base, bool p_validate_certs, const String &p_for_hostname, Ref<X509Certificate> p_ca_certs) {
ERR_FAIL_COND_V(!p_base.is_valid() || !p_base->is_connected_to_host(), 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_DATAGRAM, 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);
mbedtls_ssl_set_timer_cb(ssl_ctx->get_context(), &timer, mbedtls_timing_set_delay, mbedtls_timing_get_delay);
status = STATUS_HANDSHAKING;
if ((ret = _do_handshake()) != OK) {
status = STATUS_ERROR_HOSTNAME_MISMATCH;
return FAILED;
}
return OK;
}
Error PacketPeerMbedDTLS::accept_peer(Ref<PacketPeerUDP> p_base, Ref<CryptoKey> p_key, Ref<X509Certificate> p_cert, Ref<X509Certificate> p_ca_chain, Ref<CookieContextMbedTLS> p_cookies) {
Error err = ssl_ctx->init_server(MBEDTLS_SSL_TRANSPORT_DATAGRAM, MBEDTLS_SSL_VERIFY_NONE, p_key, p_cert, p_cookies);
ERR_FAIL_COND_V(err != OK, err);
base = p_base;
base->set_blocking_mode(false);
mbedtls_ssl_session_reset(ssl_ctx->get_context());
int ret = _set_cookie();
if (ret != 0) {
_cleanup();
ERR_FAIL_V_MSG(FAILED, "Error setting DTLS client cookie");
}
mbedtls_ssl_set_bio(ssl_ctx->get_context(), this, bio_send, bio_recv, NULL);
mbedtls_ssl_set_timer_cb(ssl_ctx->get_context(), &timer, mbedtls_timing_set_delay, mbedtls_timing_get_delay);
status = STATUS_HANDSHAKING;
if ((ret = _do_handshake()) != OK) {
status = STATUS_ERROR;
return FAILED;
}
return OK;
}
Error PacketPeerMbedDTLS::put_packet(const uint8_t *p_buffer, int p_bytes) {
ERR_FAIL_COND_V(status != STATUS_CONNECTED, ERR_UNCONFIGURED);
if (p_bytes == 0)
return OK;
int ret = mbedtls_ssl_write(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 <= 0) {
SSLContextMbedTLS::print_mbedtls_error(ret);
_cleanup();
return ERR_CONNECTION_ERROR;
}
return OK;
}
Error PacketPeerMbedDTLS::get_packet(const uint8_t **r_buffer, int &r_bytes) {
ERR_FAIL_COND_V(status != STATUS_CONNECTED, ERR_UNCONFIGURED);
r_bytes = 0;
int ret = mbedtls_ssl_read(ssl_ctx->get_context(), packet_buffer, PACKET_BUFFER_SIZE);
if (ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE) {
ret = 0; // non blocking io
} else if (ret <= 0) {
if (ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY) {
// Also send close notify back
disconnect_from_peer();
} else {
_cleanup();
status = STATUS_ERROR;
SSLContextMbedTLS::print_mbedtls_error(ret);
}
return ERR_CONNECTION_ERROR;
}
*r_buffer = packet_buffer;
r_bytes = ret;
return OK;
}
void PacketPeerMbedDTLS::poll() {
if (status == STATUS_HANDSHAKING) {
_do_handshake();
return;
} else if (status != STATUS_CONNECTED) {
return;
}
ERR_FAIL_COND(!base.is_valid());
int ret = mbedtls_ssl_read(ssl_ctx->get_context(), NULL, 0);
if (ret < 0 && ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
if (ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY) {
// Also send close notify back
disconnect_from_peer();
} else {
_cleanup();
status = STATUS_ERROR;
SSLContextMbedTLS::print_mbedtls_error(ret);
}
}
}
int PacketPeerMbedDTLS::get_available_packet_count() const {
ERR_FAIL_COND_V(status != STATUS_CONNECTED, 0);
return mbedtls_ssl_get_bytes_avail(&(ssl_ctx->ssl)) > 0 ? 1 : 0;
}
int PacketPeerMbedDTLS::get_max_packet_size() const {
return 488; // 512 (UDP in Godot) - 24 (DTLS header)
}
PacketPeerMbedDTLS::PacketPeerMbedDTLS() {
ssl_ctx.instance();
status = STATUS_DISCONNECTED;
}
PacketPeerMbedDTLS::~PacketPeerMbedDTLS() {
disconnect_from_peer();
}
void PacketPeerMbedDTLS::disconnect_from_peer() {
if (status != STATUS_CONNECTED && status != STATUS_HANDSHAKING)
return;
if (status == STATUS_CONNECTED) {
int ret = 0;
// Send SSL close notification, blocking, but ignore other errors.
do
ret = mbedtls_ssl_close_notify(ssl_ctx->get_context());
while (ret == MBEDTLS_ERR_SSL_WANT_WRITE);
}
_cleanup();
}
PacketPeerMbedDTLS::Status PacketPeerMbedDTLS::get_status() const {
return status;
}
PacketPeerDTLS *PacketPeerMbedDTLS::_create_func() {
return memnew(PacketPeerMbedDTLS);
}
void PacketPeerMbedDTLS::initialize_dtls() {
_create = _create_func;
available = true;
}
void PacketPeerMbedDTLS::finalize_dtls() {
_create = NULL;
available = false;
}

88
modules/mbedtls/packet_peer_mbed_dtls.h Executable file
View file

@ -0,0 +1,88 @@
/*************************************************************************/
/* packet_peer_mbed_dtls.h */
/*************************************************************************/
/* 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. */
/*************************************************************************/
#ifndef PACKET_PEER_MBED_DTLS_H
#define PACKET_PEER_MBED_DTLS_H
#include "core/io/packet_peer_dtls.h"
#include "ssl_context_mbedtls.h"
#include <mbedtls/timing.h>
class PacketPeerMbedDTLS : public PacketPeerDTLS {
private:
enum {
PACKET_BUFFER_SIZE = 65536
};
uint8_t packet_buffer[PACKET_BUFFER_SIZE];
Status status;
String hostname;
Ref<PacketPeerUDP> base;
static PacketPeerDTLS *_create_func();
static int bio_recv(void *ctx, unsigned char *buf, size_t len);
static int bio_send(void *ctx, const unsigned char *buf, size_t len);
void _cleanup();
protected:
Ref<SSLContextMbedTLS> ssl_ctx;
mbedtls_timing_delay_context timer;
static void _bind_methods();
Error _do_handshake();
int _set_cookie();
public:
virtual void poll();
virtual Error accept_peer(Ref<PacketPeerUDP> p_base, Ref<CryptoKey> p_key, Ref<X509Certificate> p_cert = Ref<X509Certificate>(), Ref<X509Certificate> p_ca_chain = Ref<X509Certificate>(), Ref<CookieContextMbedTLS> p_cookies = Ref<CookieContextMbedTLS>());
virtual Error connect_to_peer(Ref<PacketPeerUDP> p_base, bool p_validate_certs = false, const String &p_for_hostname = String(), Ref<X509Certificate> p_ca_certs = Ref<X509Certificate>());
virtual Status get_status() const;
virtual void disconnect_from_peer();
virtual Error get_packet(const uint8_t **r_buffer, int &r_buffer_size);
virtual Error put_packet(const uint8_t *p_buffer, int p_buffer_size);
virtual int get_available_packet_count() const;
virtual int get_max_packet_size() const;
static void initialize_dtls();
static void finalize_dtls();
PacketPeerMbedDTLS();
~PacketPeerMbedDTLS();
};
#endif // PACKET_PEER_MBED_DTLS_H

6
modules/mbedtls/register_types.cpp
View file

@ -31,16 +31,22 @@
#include "register_types.h"
#include "crypto_mbedtls.h"
#include "dtls_server_mbedtls.h"
#include "packet_peer_mbed_dtls.h"
#include "stream_peer_mbedtls.h"
void register_mbedtls_types() {
CryptoMbedTLS::initialize_crypto();
StreamPeerMbedTLS::initialize_ssl();
PacketPeerMbedDTLS::initialize_dtls();
DTLSServerMbedTLS::initialize();
}
void unregister_mbedtls_types() {
DTLSServerMbedTLS::finalize();
PacketPeerMbedDTLS::finalize_dtls();
StreamPeerMbedTLS::finalize_ssl();
CryptoMbedTLS::finalize_crypto();
}

56
modules/mbedtls/ssl_context_mbedtls.cpp
View file

@ -43,6 +43,48 @@ void SSLContextMbedTLS::print_mbedtls_error(int p_ret) {
fflush(stdout);
}
/// CookieContextMbedTLS
Error CookieContextMbedTLS::setup() {
ERR_FAIL_COND_V_MSG(inited, ERR_ALREADY_IN_USE, "This cookie context is already in use");
mbedtls_ctr_drbg_init(&ctr_drbg);
mbedtls_entropy_init(&entropy);
mbedtls_ssl_cookie_init(&cookie_ctx);
inited = true;
int ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy, NULL, 0);
if (ret != 0) {
clear(); // Never leave unusable resources around.
ERR_FAIL_V_MSG(FAILED, "mbedtls_ctr_drbg_seed returned an error " + itos(ret));
}
ret = mbedtls_ssl_cookie_setup(&cookie_ctx, mbedtls_ctr_drbg_random, &ctr_drbg);
if (ret != 0) {
clear();
ERR_FAIL_V_MSG(FAILED, "mbedtls_ssl_cookie_setup returned an error " + itos(ret));
}
return OK;
}
void CookieContextMbedTLS::clear() {
if (!inited)
return;
mbedtls_ctr_drbg_free(&ctr_drbg);
mbedtls_entropy_free(&entropy);
mbedtls_ssl_cookie_free(&cookie_ctx);
}
CookieContextMbedTLS::CookieContextMbedTLS() {
inited = false;
}
CookieContextMbedTLS::~CookieContextMbedTLS() {
clear();
}
/// SSLContextMbedTLS
Error SSLContextMbedTLS::_setup(int p_endpoint, int p_transport, int p_authmode) {
ERR_FAIL_COND_V_MSG(inited, ERR_ALREADY_IN_USE, "This SSL context is already active");
@ -55,7 +97,7 @@ Error SSLContextMbedTLS::_setup(int p_endpoint, int p_transport, int p_authmode)
int ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy, NULL, 0);
if (ret != 0) {
clear(); // Never leave unusable resources around.
ERR_FAIL_V_MSG(FAILED, "mbedtls_ctr_drbg_seed returned an error" + itos(ret));
ERR_FAIL_V_MSG(FAILED, "mbedtls_ctr_drbg_seed returned an error " + itos(ret));
}
ret = mbedtls_ssl_config_defaults(&conf, p_endpoint, p_transport, MBEDTLS_SSL_PRESET_DEFAULT);
@ -69,7 +111,7 @@ Error SSLContextMbedTLS::_setup(int p_endpoint, int p_transport, int p_authmode)
return OK;
}
Error SSLContextMbedTLS::init_server(int p_transport, int p_authmode, Ref<CryptoKeyMbedTLS> p_pkey, Ref<X509CertificateMbedTLS> p_cert) {
Error SSLContextMbedTLS::init_server(int p_transport, int p_authmode, Ref<CryptoKeyMbedTLS> p_pkey, Ref<X509CertificateMbedTLS> p_cert, Ref<CookieContextMbedTLS> p_cookies) {
ERR_FAIL_COND_V(!p_pkey.is_valid(), ERR_INVALID_PARAMETER);
ERR_FAIL_COND_V(!p_cert.is_valid(), ERR_INVALID_PARAMETER);
@ -94,6 +136,15 @@ Error SSLContextMbedTLS::init_server(int p_transport, int p_authmode, Ref<Crypto
if (certs->cert.next) {
mbedtls_ssl_conf_ca_chain(&conf, certs->cert.next, NULL);
}
// DTLS Cookies
if (p_transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM) {
if (p_cookies.is_null() || !p_cookies->inited) {
clear();
ERR_FAIL_V(ERR_BUG);
}
cookies = p_cookies;
mbedtls_ssl_conf_dtls_cookies(&conf, mbedtls_ssl_cookie_write, mbedtls_ssl_cookie_check, &(cookies->cookie_ctx));
}
mbedtls_ssl_setup(&ssl, &conf);
return OK;
}
@ -139,6 +190,7 @@ void SSLContextMbedTLS::clear() {
if (pkey.is_valid())
pkey->unlock();
pkey = Ref<CryptoKeyMbedTLS>();
cookies = Ref<CookieContextMbedTLS>();
inited = false;
}

24
modules/mbedtls/ssl_context_mbedtls.h
View file

@ -42,6 +42,27 @@
#include <mbedtls/debug.h>
#include <mbedtls/entropy.h>
#include <mbedtls/ssl.h>
#include <mbedtls/ssl_cookie.h>
class SSLContextMbedTLS;
class CookieContextMbedTLS : public Reference {
friend class SSLContextMbedTLS;
protected:
bool inited;
mbedtls_entropy_context entropy;
mbedtls_ctr_drbg_context ctr_drbg;
mbedtls_ssl_cookie_ctx cookie_ctx;
public:
Error setup();
void clear();
CookieContextMbedTLS();
~CookieContextMbedTLS();
};
class SSLContextMbedTLS : public Reference {
@ -59,10 +80,11 @@ public:
mbedtls_ssl_context ssl;
mbedtls_ssl_config conf;
Ref<CookieContextMbedTLS> cookies;
Ref<CryptoKeyMbedTLS> pkey;
Error _setup(int p_endpoint, int p_transport, int p_authmode);
Error init_server(int p_transport, int p_authmode, Ref<CryptoKeyMbedTLS> p_pkey, Ref<X509CertificateMbedTLS> p_cert);
Error init_server(int p_transport, int p_authmode, Ref<CryptoKeyMbedTLS> p_pkey, Ref<X509CertificateMbedTLS> p_cert, Ref<CookieContextMbedTLS> p_cookies = Ref<CookieContextMbedTLS>());
Error init_client(int p_transport, int p_authmode, Ref<X509CertificateMbedTLS> p_valid_cas);
void clear();