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Diffstat (limited to 'modules/mbedtls/packet_peer_mbed_dtls.cpp')
-rwxr-xr-xmodules/mbedtls/packet_peer_mbed_dtls.cpp297
1 files changed, 297 insertions, 0 deletions
diff --git a/modules/mbedtls/packet_peer_mbed_dtls.cpp b/modules/mbedtls/packet_peer_mbed_dtls.cpp
new file mode 100755
index 0000000000..134bd54801
--- /dev/null
+++ b/modules/mbedtls/packet_peer_mbed_dtls.cpp
@@ -0,0 +1,297 @@
+/*************************************************************************/
+/* packet_peer_mbed_dtls.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 "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;
+}
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