7 files changed, 672 insertions, 88 deletions

diff --git a/modules/mbedtls/crypto_mbedtls.cpp b/modules/mbedtls/crypto_mbedtls.cpp
new file mode 100644
index 0000000000..1e02084ae2
--- /dev/null
+++ b/modules/mbedtls/crypto_mbedtls.cpp
@@ -0,0 +1,285 @@
+/*************************************************************************/
+/*  crypto_mbedtls.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 "crypto_mbedtls.h"
+
+#include "core/os/file_access.h"
+
+#include "core/engine.h"
+#include "core/io/certs_compressed.gen.h"
+#include "core/io/compression.h"
+#include "core/project_settings.h"
+
+#ifdef TOOLS_ENABLED
+#include "editor/editor_settings.h"
+#endif
+#define PEM_BEGIN_CRT "-----BEGIN CERTIFICATE-----\n"
+#define PEM_END_CRT "-----END CERTIFICATE-----\n"
+
+#include "mbedtls/pem.h"
+#include <mbedtls/debug.h>
+
+CryptoKey *CryptoKeyMbedTLS::create() {
+	return memnew(CryptoKeyMbedTLS);
+}
+
+Error CryptoKeyMbedTLS::load(String p_path) {
+	ERR_FAIL_COND_V_MSG(locks, ERR_ALREADY_IN_USE, "Key is in use");
+
+	PoolByteArray out;
+	FileAccess *f = FileAccess::open(p_path, FileAccess::READ);
+	ERR_FAIL_COND_V(!f, ERR_INVALID_PARAMETER);
+
+	int flen = f->get_len();
+	out.resize(flen + 1);
+	{
+		PoolByteArray::Write w = out.write();
+		f->get_buffer(w.ptr(), flen);
+		w[flen] = 0; //end f string
+	}
+	memdelete(f);
+
+	int ret = mbedtls_pk_parse_key(&pkey, out.read().ptr(), out.size(), NULL, 0);
+	// We MUST zeroize the memory for safety!
+	mbedtls_platform_zeroize(out.write().ptr(), out.size());
+	ERR_FAIL_COND_V_MSG(ret, FAILED, "Error parsing private key: " + itos(ret));
+
+	return OK;
+}
+
+Error CryptoKeyMbedTLS::save(String p_path) {
+	FileAccess *f = FileAccess::open(p_path, FileAccess::WRITE);
+	ERR_FAIL_COND_V(!f, ERR_INVALID_PARAMETER);
+
+	unsigned char w[16000];
+	memset(w, 0, sizeof(w));
+
+	int ret = mbedtls_pk_write_key_pem(&pkey, w, sizeof(w));
+	if (ret != 0) {
+		memdelete(f);
+		memset(w, 0, sizeof(w)); // Zeroize anything we might have written.
+		ERR_FAIL_V_MSG(FAILED, "Error writing key: " + itos(ret));
+	}
+
+	size_t len = strlen((char *)w);
+	f->store_buffer(w, len);
+	memdelete(f);
+	memset(w, 0, sizeof(w)); // Zeroize temporary buffer.
+	return OK;
+}
+
+X509Certificate *X509CertificateMbedTLS::create() {
+	return memnew(X509CertificateMbedTLS);
+}
+
+Error X509CertificateMbedTLS::load(String p_path) {
+	ERR_FAIL_COND_V_MSG(locks, ERR_ALREADY_IN_USE, "Certificate is in use");
+
+	PoolByteArray out;
+	FileAccess *f = FileAccess::open(p_path, FileAccess::READ);
+	ERR_FAIL_COND_V(!f, ERR_INVALID_PARAMETER);
+
+	int flen = f->get_len();
+	out.resize(flen + 1);
+	{
+		PoolByteArray::Write w = out.write();
+		f->get_buffer(w.ptr(), flen);
+		w[flen] = 0; //end f string
+	}
+	memdelete(f);
+
+	int ret = mbedtls_x509_crt_parse(&cert, out.read().ptr(), out.size());
+	ERR_FAIL_COND_V_MSG(ret, FAILED, "Error parsing some certificates: " + itos(ret));
+
+	return OK;
+}
+
+Error X509CertificateMbedTLS::load_from_memory(const uint8_t *p_buffer, int p_len) {
+	ERR_FAIL_COND_V_MSG(locks, ERR_ALREADY_IN_USE, "Certificate is in use");
+
+	int ret = mbedtls_x509_crt_parse(&cert, p_buffer, p_len);
+	ERR_FAIL_COND_V_MSG(ret, FAILED, "Error parsing certificates: " + itos(ret));
+	return OK;
+}
+
+Error X509CertificateMbedTLS::save(String p_path) {
+	FileAccess *f = FileAccess::open(p_path, FileAccess::WRITE);
+	ERR_FAIL_COND_V(!f, ERR_INVALID_PARAMETER);
+
+	mbedtls_x509_crt *crt = &cert;
+	while (crt) {
+		unsigned char w[4096];
+		size_t wrote = 0;
+		int ret = mbedtls_pem_write_buffer(PEM_BEGIN_CRT, PEM_END_CRT, cert.raw.p, cert.raw.len, w, sizeof(w), &wrote);
+		if (ret != 0 || wrote == 0) {
+			memdelete(f);
+			ERR_FAIL_V_MSG(FAILED, "Error writing certificate: " + itos(ret));
+		}
+
+		f->store_buffer(w, wrote - 1); // don't write the string terminator
+		crt = crt->next;
+	}
+	memdelete(f);
+	return OK;
+}
+
+Crypto *CryptoMbedTLS::create() {
+	return memnew(CryptoMbedTLS);
+}
+
+void CryptoMbedTLS::initialize_crypto() {
+
+#ifdef DEBUG_ENABLED
+	mbedtls_debug_set_threshold(1);
+#endif
+
+	Crypto::_create = create;
+	Crypto::_load_default_certificates = load_default_certificates;
+	X509CertificateMbedTLS::make_default();
+	CryptoKeyMbedTLS::make_default();
+}
+
+void CryptoMbedTLS::finalize_crypto() {
+	Crypto::_create = NULL;
+	Crypto::_load_default_certificates = NULL;
+	if (default_certs) {
+		memdelete(default_certs);
+		default_certs = NULL;
+	}
+	X509CertificateMbedTLS::finalize();
+	CryptoKeyMbedTLS::finalize();
+}
+
+CryptoMbedTLS::CryptoMbedTLS() {
+	mbedtls_ctr_drbg_init(&ctr_drbg);
+	mbedtls_entropy_init(&entropy);
+	int 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));
+	}
+}
+
+CryptoMbedTLS::~CryptoMbedTLS() {
+	mbedtls_ctr_drbg_free(&ctr_drbg);
+	mbedtls_entropy_free(&entropy);
+}
+
+X509CertificateMbedTLS *CryptoMbedTLS::default_certs = NULL;
+
+X509CertificateMbedTLS *CryptoMbedTLS::get_default_certificates() {
+	return default_certs;
+}
+
+void CryptoMbedTLS::load_default_certificates(String p_path) {
+	ERR_FAIL_COND(default_certs != NULL);
+
+	default_certs = memnew(X509CertificateMbedTLS);
+	ERR_FAIL_COND(default_certs == NULL);
+
+	String certs_path = GLOBAL_DEF("network/ssl/certificates", "");
+
+	if (p_path != "") {
+		// Use certs defined in project settings.
+		default_certs->load(p_path);
+	}
+#ifdef BUILTIN_CERTS_ENABLED
+	else {
+		// Use builtin certs only if user did not override it in project settings.
+		PoolByteArray out;
+		out.resize(_certs_uncompressed_size + 1);
+		PoolByteArray::Write w = out.write();
+		Compression::decompress(w.ptr(), _certs_uncompressed_size, _certs_compressed, _certs_compressed_size, Compression::MODE_DEFLATE);
+		w[_certs_uncompressed_size] = 0; // Make sure it ends with string terminator
+#ifdef DEBUG_ENABLED
+		print_verbose("Loaded builtin certs");
+#endif
+		default_certs->load_from_memory(out.read().ptr(), out.size());
+	}
+#endif
+}
+
+Ref<CryptoKey> CryptoMbedTLS::generate_rsa(int p_bytes) {
+	Ref<CryptoKeyMbedTLS> out;
+	out.instance();
+	int ret = mbedtls_pk_setup(&(out->pkey), mbedtls_pk_info_from_type(MBEDTLS_PK_RSA));
+	ERR_FAIL_COND_V(ret != 0, NULL);
+	ret = mbedtls_rsa_gen_key(mbedtls_pk_rsa(out->pkey), mbedtls_ctr_drbg_random, &ctr_drbg, p_bytes, 65537);
+	ERR_FAIL_COND_V(ret != 0, NULL);
+	return out;
+}
+
+Ref<X509Certificate> CryptoMbedTLS::generate_self_signed_certificate(Ref<CryptoKey> p_key, String p_issuer_name, String p_not_before, String p_not_after) {
+	Ref<CryptoKeyMbedTLS> key = static_cast<Ref<CryptoKeyMbedTLS> >(p_key);
+	mbedtls_x509write_cert crt;
+	mbedtls_x509write_crt_init(&crt);
+
+	mbedtls_x509write_crt_set_subject_key(&crt, &(key->pkey));
+	mbedtls_x509write_crt_set_issuer_key(&crt, &(key->pkey));
+	mbedtls_x509write_crt_set_subject_name(&crt, p_issuer_name.utf8().get_data());
+	mbedtls_x509write_crt_set_issuer_name(&crt, p_issuer_name.utf8().get_data());
+	mbedtls_x509write_crt_set_version(&crt, MBEDTLS_X509_CRT_VERSION_3);
+	mbedtls_x509write_crt_set_md_alg(&crt, MBEDTLS_MD_SHA256);
+
+	mbedtls_mpi serial;
+	mbedtls_mpi_init(&serial);
+	uint8_t rand_serial[20];
+	mbedtls_ctr_drbg_random(&ctr_drbg, rand_serial, 20);
+	ERR_FAIL_COND_V(mbedtls_mpi_read_binary(&serial, rand_serial, 20), NULL);
+	mbedtls_x509write_crt_set_serial(&crt, &serial);
+
+	mbedtls_x509write_crt_set_validity(&crt, p_not_before.utf8().get_data(), p_not_after.utf8().get_data());
+	mbedtls_x509write_crt_set_basic_constraints(&crt, 1, -1);
+	mbedtls_x509write_crt_set_basic_constraints(&crt, 1, 0);
+
+	unsigned char buf[4096];
+	memset(buf, 0, 4096);
+	Ref<X509CertificateMbedTLS> out;
+	out.instance();
+	mbedtls_x509write_crt_pem(&crt, buf, 4096, mbedtls_ctr_drbg_random, &ctr_drbg);
+
+	int err = mbedtls_x509_crt_parse(&(out->cert), buf, 4096);
+	if (err != 0) {
+		mbedtls_mpi_free(&serial);
+		mbedtls_x509write_crt_free(&crt);
+		ERR_PRINTS("Generated invalid certificate: " + itos(err));
+		return NULL;
+	}
+
+	mbedtls_mpi_free(&serial);
+	mbedtls_x509write_crt_free(&crt);
+	return out;
+}
+
+PoolByteArray CryptoMbedTLS::generate_random_bytes(int p_bytes) {
+	PoolByteArray out;
+	out.resize(p_bytes);
+	mbedtls_ctr_drbg_random(&ctr_drbg, out.write().ptr(), p_bytes);
+	return out;
+}
diff --git a/modules/mbedtls/crypto_mbedtls.h b/modules/mbedtls/crypto_mbedtls.h
new file mode 100644
index 0000000000..06b3ecd234
--- /dev/null
+++ b/modules/mbedtls/crypto_mbedtls.h
@@ -0,0 +1,124 @@
+/*************************************************************************/
+/*  crypto_mbedtls.h                                                     */
+/*************************************************************************/
+/*                       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.                */
+/*************************************************************************/
+
+#ifndef CRYPTO_MBEDTLS_H
+#define CRYPTO_MBEDTLS_H
+
+#include "core/crypto/crypto.h"
+#include "core/resource.h"
+
+#include <mbedtls/ctr_drbg.h>
+#include <mbedtls/entropy.h>
+#include <mbedtls/ssl.h>
+
+class CryptoMbedTLS;
+class SSLContextMbedTLS;
+class CryptoKeyMbedTLS : public CryptoKey {
+
+private:
+	mbedtls_pk_context pkey;
+	int locks;
+
+public:
+	static CryptoKey *create();
+	static void make_default() { CryptoKey::_create = create; }
+	static void finalize() { CryptoKey::_create = NULL; }
+
+	virtual Error load(String p_path);
+	virtual Error save(String p_path);
+
+	CryptoKeyMbedTLS() {
+		mbedtls_pk_init(&pkey);
+		locks = 0;
+	}
+	~CryptoKeyMbedTLS() {
+		mbedtls_pk_free(&pkey);
+	}
+
+	_FORCE_INLINE_ void lock() { locks++; }
+	_FORCE_INLINE_ void unlock() { locks--; }
+
+	friend class CryptoMbedTLS;
+	friend class SSLContextMbedTLS;
+};
+
+class X509CertificateMbedTLS : public X509Certificate {
+
+private:
+	mbedtls_x509_crt cert;
+	int locks;
+
+public:
+	static X509Certificate *create();
+	static void make_default() { X509Certificate::_create = create; }
+	static void finalize() { X509Certificate::_create = NULL; }
+
+	virtual Error load(String p_path);
+	virtual Error load_from_memory(const uint8_t *p_buffer, int p_len);
+	virtual Error save(String p_path);
+
+	X509CertificateMbedTLS() {
+		mbedtls_x509_crt_init(&cert);
+		locks = 0;
+	}
+	~X509CertificateMbedTLS() {
+		mbedtls_x509_crt_free(&cert);
+	}
+
+	_FORCE_INLINE_ void lock() { locks++; }
+	_FORCE_INLINE_ void unlock() { locks--; }
+
+	friend class CryptoMbedTLS;
+	friend class SSLContextMbedTLS;
+};
+
+class CryptoMbedTLS : public Crypto {
+
+private:
+	mbedtls_entropy_context entropy;
+	mbedtls_ctr_drbg_context ctr_drbg;
+	static X509CertificateMbedTLS *default_certs;
+
+public:
+	static Crypto *create();
+	static void initialize_crypto();
+	static void finalize_crypto();
+	static X509CertificateMbedTLS *get_default_certificates();
+	static void load_default_certificates(String p_path);
+
+	virtual PoolByteArray generate_random_bytes(int p_bytes);
+	virtual Ref<CryptoKey> generate_rsa(int p_bytes);
+	virtual Ref<X509Certificate> generate_self_signed_certificate(Ref<CryptoKey> p_key, String p_issuer_name, String p_not_before, String p_not_after);
+
+	CryptoMbedTLS();
+	~CryptoMbedTLS();
+};
+
+#endif // CRYPTO_MBEDTLS_H
diff --git a/modules/mbedtls/register_types.cpp b/modules/mbedtls/register_types.cpp
index 121ed5eb02..f7dc6c785f 100755
--- a/modules/mbedtls/register_types.cpp
+++ b/modules/mbedtls/register_types.cpp
@@ -30,15 +30,17 @@
 
 #include "register_types.h"
 
-#include "stream_peer_mbed_tls.h"
+#include "crypto_mbedtls.h"
+#include "stream_peer_mbedtls.h"
 
 void register_mbedtls_types() {
 
-	ClassDB::register_class<StreamPeerMbedTLS>();
+	CryptoMbedTLS::initialize_crypto();
 	StreamPeerMbedTLS::initialize_ssl();
 }
 
 void unregister_mbedtls_types() {
 
 	StreamPeerMbedTLS::finalize_ssl();
+	CryptoMbedTLS::finalize_crypto();
 }
diff --git a/modules/mbedtls/ssl_context_mbedtls.cpp b/modules/mbedtls/ssl_context_mbedtls.cpp
new file mode 100644
index 0000000000..97b5e23f58
--- /dev/null
+++ b/modules/mbedtls/ssl_context_mbedtls.cpp
@@ -0,0 +1,151 @@
+/*************************************************************************/
+/*  ssl_context_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 "ssl_context_mbedtls.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);
+}
+
+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");
+
+	mbedtls_ssl_init(&ssl);
+	mbedtls_ssl_config_init(&conf);
+	mbedtls_ctr_drbg_init(&ctr_drbg);
+	mbedtls_entropy_init(&entropy);
+	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_config_defaults(&conf, p_endpoint, p_transport, MBEDTLS_SSL_PRESET_DEFAULT);
+	if (ret != 0) {
+		clear();
+		ERR_FAIL_V_MSG(FAILED, "mbedtls_ssl_config_defaults returned an error" + itos(ret));
+	}
+	mbedtls_ssl_conf_authmode(&conf, p_authmode);
+	mbedtls_ssl_conf_rng(&conf, mbedtls_ctr_drbg_random, &ctr_drbg);
+	mbedtls_ssl_conf_dbg(&conf, my_debug, stdout);
+	return OK;
+}
+
+Error SSLContextMbedTLS::init_server(int p_transport, int p_authmode, Ref<CryptoKeyMbedTLS> p_pkey, Ref<X509CertificateMbedTLS> p_cert) {
+	ERR_FAIL_COND_V(!p_pkey.is_valid(), ERR_INVALID_PARAMETER);
+	ERR_FAIL_COND_V(!p_cert.is_valid(), ERR_INVALID_PARAMETER);
+
+	Error err = _setup(MBEDTLS_SSL_IS_SERVER, p_transport, p_authmode);
+	ERR_FAIL_COND_V(err != OK, err);
+
+	// Locking key and certificate(s)
+	pkey = p_pkey;
+	certs = p_cert;
+	if (pkey.is_valid())
+		pkey->lock();
+	if (certs.is_valid())
+		certs->lock();
+
+	// Adding key and certificate
+	int ret = mbedtls_ssl_conf_own_cert(&conf, &(certs->cert), &(pkey->pkey));
+	if (ret != 0) {
+		clear();
+		ERR_FAIL_V_MSG(ERR_INVALID_PARAMETER, "Invalid cert/key combination " + itos(ret));
+	}
+	// Adding CA chain if available.
+	if (certs->cert.next) {
+		mbedtls_ssl_conf_ca_chain(&conf, certs->cert.next, NULL);
+	}
+	mbedtls_ssl_setup(&ssl, &conf);
+	return OK;
+}
+
+Error SSLContextMbedTLS::init_client(int p_transport, int p_authmode, Ref<X509CertificateMbedTLS> p_valid_cas) {
+	Error err = _setup(MBEDTLS_SSL_IS_CLIENT, p_transport, p_authmode);
+	ERR_FAIL_COND_V(err != OK, err);
+
+	X509CertificateMbedTLS *cas = NULL;
+
+	if (p_valid_cas.is_valid()) {
+		// Locking CA certificates
+		certs = p_valid_cas;
+		certs->lock();
+		cas = certs.ptr();
+	} else {
+		// Fall back to default certificates (no need to lock those).
+		cas = CryptoMbedTLS::get_default_certificates();
+		if (cas == NULL) {
+			clear();
+			ERR_FAIL_V_MSG(ERR_UNCONFIGURED, "SSL module failed to initialize!");
+		}
+	}
+
+	// Set valid CAs
+	mbedtls_ssl_conf_ca_chain(&conf, &(cas->cert), NULL);
+	mbedtls_ssl_setup(&ssl, &conf);
+	return OK;
+}
+
+void SSLContextMbedTLS::clear() {
+	if (!inited)
+		return;
+	mbedtls_ssl_free(&ssl);
+	mbedtls_ssl_config_free(&conf);
+	mbedtls_ctr_drbg_free(&ctr_drbg);
+	mbedtls_entropy_free(&entropy);
+
+	// Unlock and key and certificates
+	if (certs.is_valid())
+		certs->unlock();
+	certs = Ref<X509Certificate>();
+	if (pkey.is_valid())
+		pkey->unlock();
+	pkey = Ref<CryptoKeyMbedTLS>();
+	inited = false;
+}
+
+mbedtls_ssl_context *SSLContextMbedTLS::get_context() {
+	ERR_FAIL_COND_V(!inited, NULL);
+	return &ssl;
+}
+
+SSLContextMbedTLS::SSLContextMbedTLS() {
+	inited = false;
+}
+
+SSLContextMbedTLS::~SSLContextMbedTLS() {
+	clear();
+}
diff --git a/modules/mbedtls/ssl_context_mbedtls.h b/modules/mbedtls/ssl_context_mbedtls.h
new file mode 100644
index 0000000000..b78ee37b03
--- /dev/null
+++ b/modules/mbedtls/ssl_context_mbedtls.h
@@ -0,0 +1,73 @@
+/*************************************************************************/
+/*  ssl_context_mbed_tls.h                                               */
+/*************************************************************************/
+/*                       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.                */
+/*************************************************************************/
+
+#ifndef SSL_CONTEXT_MBED_TLS_H
+#define SSL_CONTEXT_MBED_TLS_H
+
+#include "crypto_mbedtls.h"
+
+#include "core/os/file_access.h"
+#include "core/pool_vector.h"
+#include "core/reference.h"
+
+#include <mbedtls/config.h>
+#include <mbedtls/ctr_drbg.h>
+#include <mbedtls/debug.h>
+#include <mbedtls/entropy.h>
+#include <mbedtls/ssl.h>
+
+class SSLContextMbedTLS : public Reference {
+
+protected:
+	bool inited;
+
+	static PoolByteArray _read_file(String p_path);
+
+public:
+	Ref<X509CertificateMbedTLS> certs;
+	mbedtls_entropy_context entropy;
+	mbedtls_ctr_drbg_context ctr_drbg;
+	mbedtls_ssl_context ssl;
+	mbedtls_ssl_config conf;
+
+	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_client(int p_transport, int p_authmode, Ref<X509CertificateMbedTLS> p_valid_cas);
+	void clear();
+
+	mbedtls_ssl_context *get_context();
+
+	SSLContextMbedTLS();
+	~SSLContextMbedTLS();
+};
+
+#endif // SSL_CONTEXT_MBED_TLS_H
diff --git a/modules/mbedtls/stream_peer_mbed_tls.cpp b/modules/mbedtls/stream_peer_mbedtls.cpp
index 4bb7557150..e2eb19fc74 100755
--- a/modules/mbedtls/stream_peer_mbed_tls.cpp
+++ b/modules/mbedtls/stream_peer_mbedtls.cpp
@@ -28,19 +28,11 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
 /*************************************************************************/
 
-#include "stream_peer_mbed_tls.h"
+#include "stream_peer_mbedtls.h"
 
 #include "core/io/stream_peer_tcp.h"
 #include "core/os/file_access.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);
@@ -86,18 +78,14 @@ int StreamPeerMbedTLS::bio_recv(void *ctx, unsigned char *buf, size_t len) {
 
 void StreamPeerMbedTLS::_cleanup() {
 
-	mbedtls_ssl_free(&ssl);
-	mbedtls_ssl_config_free(&conf);
-	mbedtls_ctr_drbg_free(&ctr_drbg);
-	mbedtls_entropy_free(&entropy);
-
+	ssl_ctx->clear();
 	base = Ref<StreamPeer>();
 	status = STATUS_DISCONNECTED;
 }
 
 Error StreamPeerMbedTLS::_do_handshake() {
 	int ret = 0;
-	while ((ret = mbedtls_ssl_handshake(&ssl)) != 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));
@@ -118,7 +106,7 @@ Error StreamPeerMbedTLS::_do_handshake() {
 	return OK;
 }
 
-Error StreamPeerMbedTLS::connect_to_stream(Ref<StreamPeer> p_base, bool p_validate_certs, const String &p_for_hostname) {
+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);
 
@@ -126,31 +114,11 @@ Error StreamPeerMbedTLS::connect_to_stream(Ref<StreamPeer> p_base, bool p_valida
 	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));
-		_cleanup();
-		return FAILED;
-	}
+	Error err = ssl_ctx->init_client(MBEDTLS_SSL_TRANSPORT_STREAM, authmode, p_ca_certs);
+	ERR_FAIL_COND_V(err != OK, err);
 
-	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);
+	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;
 
@@ -162,11 +130,26 @@ Error StreamPeerMbedTLS::connect_to_stream(Ref<StreamPeer> p_base, bool p_valida
 	return OK;
 }
 
-Error StreamPeerMbedTLS::accept_stream(Ref<StreamPeer> p_base) {
+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);
@@ -197,7 +180,7 @@ Error StreamPeerMbedTLS::put_partial_data(const uint8_t *p_data, int p_bytes, in
 	if (p_bytes == 0)
 		return OK;
 
-	int ret = mbedtls_ssl_write(&ssl, p_data, p_bytes);
+	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;
@@ -243,7 +226,7 @@ Error StreamPeerMbedTLS::get_partial_data(uint8_t *p_buffer, int p_bytes, int &r
 
 	r_received = 0;
 
-	int ret = mbedtls_ssl_read(&ssl, p_buffer, p_bytes);
+	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) {
@@ -273,7 +256,7 @@ void StreamPeerMbedTLS::poll() {
 	// 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, &byte, 0);
+	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)
@@ -298,10 +281,11 @@ int StreamPeerMbedTLS::get_available_bytes() const {
 
 	ERR_FAIL_COND_V(status != STATUS_CONNECTED, 0);
 
-	return mbedtls_ssl_get_bytes_avail(&ssl);
+	return mbedtls_ssl_get_bytes_avail(&(ssl_ctx->ssl));
 }
 StreamPeerMbedTLS::StreamPeerMbedTLS() {
 
+	ssl_ctx.instance();
 	status = STATUS_DISCONNECTED;
 }
 
@@ -317,7 +301,7 @@ void StreamPeerMbedTLS::disconnect_from_stream() {
 	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);
+		mbedtls_ssl_close_notify(ssl_ctx->get_context());
 	}
 
 	_cleanup();
@@ -333,28 +317,9 @@ 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
-
 	available = true;
 }
 
@@ -362,6 +327,4 @@ void StreamPeerMbedTLS::finalize_ssl() {
 
 	available = false;
 	_create = NULL;
-	load_certs_func = NULL;
-	mbedtls_x509_crt_free(&cacert);
 }
diff --git a/modules/mbedtls/stream_peer_mbed_tls.h b/modules/mbedtls/stream_peer_mbedtls.h
index ab87b779c1..060e76b4f3 100755
--- a/modules/mbedtls/stream_peer_mbed_tls.h
+++ b/modules/mbedtls/stream_peer_mbedtls.h
@@ -32,15 +32,7 @@
 #define STREAM_PEER_OPEN_SSL_H
 
 #include "core/io/stream_peer_ssl.h"
-
-#include <mbedtls/config.h>
-#include <mbedtls/ctr_drbg.h>
-#include <mbedtls/debug.h>
-#include <mbedtls/entropy.h>
-#include <mbedtls/ssl.h>
-
-#include <stdio.h>
-#include <stdlib.h>
+#include "ssl_context_mbedtls.h"
 
 class StreamPeerMbedTLS : public StreamPeerSSL {
 private:
@@ -50,19 +42,13 @@ private:
 	Ref<StreamPeer> base;
 
 	static StreamPeerSSL *_create_func();
-	static void _load_certs(const PoolByteArray &p_array);
 
 	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:
-	static mbedtls_x509_crt cacert;
-
-	mbedtls_entropy_context entropy;
-	mbedtls_ctr_drbg_context ctr_drbg;
-	mbedtls_ssl_context ssl;
-	mbedtls_ssl_config conf;
+	Ref<SSLContextMbedTLS> ssl_ctx;
 
 	static void _bind_methods();
 
@@ -70,8 +56,8 @@ protected:
 
 public:
 	virtual void poll();
-	virtual Error accept_stream(Ref<StreamPeer> p_base);
-	virtual Error connect_to_stream(Ref<StreamPeer> p_base, bool p_validate_certs = false, const String &p_for_hostname = String());
+	virtual Error accept_stream(Ref<StreamPeer> p_base, Ref<CryptoKey> p_key, Ref<X509Certificate> p_cert, Ref<X509Certificate> p_ca_chain = Ref<X509Certificate>());
+	virtual Error connect_to_stream(Ref<StreamPeer> p_base, bool p_validate_certs = false, const String &p_for_hostname = String(), Ref<X509Certificate> p_valid_cert = Ref<X509Certificate>());
 	virtual Status get_status() const;
 
 	virtual void disconnect_from_stream();