229 lines
7.7 KiB
C++
229 lines
7.7 KiB
C++
/**************************************************************************/
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/* tls_context_mbedtls.cpp */
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/**************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/**************************************************************************/
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/**************************************************************************/
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#include "tls_context_mbedtls.h"
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static void my_debug(void *ctx, int level,
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const char *file, int line,
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const char *str) {
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printf("%s:%04d: %s", file, line, str);
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fflush(stdout);
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}
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void TLSContextMbedTLS::print_mbedtls_error(int p_ret) {
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printf("mbedtls error: returned -0x%x\n\n", -p_ret);
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fflush(stdout);
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}
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/// CookieContextMbedTLS
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Error CookieContextMbedTLS::setup() {
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ERR_FAIL_COND_V_MSG(inited, ERR_ALREADY_IN_USE, "This cookie context is already in use");
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mbedtls_ctr_drbg_init(&ctr_drbg);
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mbedtls_entropy_init(&entropy);
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mbedtls_ssl_cookie_init(&cookie_ctx);
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inited = true;
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int ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy, nullptr, 0);
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if (ret != 0) {
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clear(); // Never leave unusable resources around.
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ERR_FAIL_V_MSG(FAILED, "mbedtls_ctr_drbg_seed returned an error " + itos(ret));
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}
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ret = mbedtls_ssl_cookie_setup(&cookie_ctx, mbedtls_ctr_drbg_random, &ctr_drbg);
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if (ret != 0) {
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clear();
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ERR_FAIL_V_MSG(FAILED, "mbedtls_ssl_cookie_setup returned an error " + itos(ret));
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}
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return OK;
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}
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void CookieContextMbedTLS::clear() {
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if (!inited) {
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return;
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}
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mbedtls_ctr_drbg_free(&ctr_drbg);
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mbedtls_entropy_free(&entropy);
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mbedtls_ssl_cookie_free(&cookie_ctx);
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}
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CookieContextMbedTLS::CookieContextMbedTLS() {
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}
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CookieContextMbedTLS::~CookieContextMbedTLS() {
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clear();
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}
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/// TLSContextMbedTLS
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Error TLSContextMbedTLS::_setup(int p_endpoint, int p_transport, int p_authmode) {
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ERR_FAIL_COND_V_MSG(inited, ERR_ALREADY_IN_USE, "This SSL context is already active");
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mbedtls_ssl_init(&tls);
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mbedtls_ssl_config_init(&conf);
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mbedtls_ctr_drbg_init(&ctr_drbg);
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mbedtls_entropy_init(&entropy);
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inited = true;
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int ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy, nullptr, 0);
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if (ret != 0) {
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clear(); // Never leave unusable resources around.
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ERR_FAIL_V_MSG(FAILED, "mbedtls_ctr_drbg_seed returned an error " + itos(ret));
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}
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ret = mbedtls_ssl_config_defaults(&conf, p_endpoint, p_transport, MBEDTLS_SSL_PRESET_DEFAULT);
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if (ret != 0) {
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clear();
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ERR_FAIL_V_MSG(FAILED, "mbedtls_ssl_config_defaults returned an error" + itos(ret));
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}
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mbedtls_ssl_conf_authmode(&conf, p_authmode);
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mbedtls_ssl_conf_rng(&conf, mbedtls_ctr_drbg_random, &ctr_drbg);
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mbedtls_ssl_conf_dbg(&conf, my_debug, stdout);
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return OK;
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}
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Error TLSContextMbedTLS::init_server(int p_transport, Ref<TLSOptions> p_options, Ref<CookieContextMbedTLS> p_cookies) {
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ERR_FAIL_COND_V(p_options.is_null() || !p_options->is_server(), ERR_INVALID_PARAMETER);
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// Check key and certificate(s)
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pkey = p_options->get_private_key();
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certs = p_options->get_own_certificate();
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ERR_FAIL_COND_V(pkey.is_null() || certs.is_null(), ERR_INVALID_PARAMETER);
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Error err = _setup(MBEDTLS_SSL_IS_SERVER, p_transport, MBEDTLS_SSL_VERIFY_NONE); // TODO client auth.
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ERR_FAIL_COND_V(err != OK, err);
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// Locking key and certificate(s)
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pkey->lock();
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certs->lock();
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// Adding key and certificate
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int ret = mbedtls_ssl_conf_own_cert(&conf, &(certs->cert), &(pkey->pkey));
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if (ret != 0) {
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clear();
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ERR_FAIL_V_MSG(ERR_INVALID_PARAMETER, "Invalid cert/key combination " + itos(ret));
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}
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// Adding CA chain if available.
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if (certs->cert.next) {
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mbedtls_ssl_conf_ca_chain(&conf, certs->cert.next, nullptr);
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}
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// DTLS Cookies
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if (p_transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM) {
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if (p_cookies.is_null() || !p_cookies->inited) {
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clear();
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ERR_FAIL_V(ERR_BUG);
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}
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cookies = p_cookies;
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mbedtls_ssl_conf_dtls_cookies(&conf, mbedtls_ssl_cookie_write, mbedtls_ssl_cookie_check, &(cookies->cookie_ctx));
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}
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mbedtls_ssl_setup(&tls, &conf);
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return OK;
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}
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Error TLSContextMbedTLS::init_client(int p_transport, const String &p_hostname, Ref<TLSOptions> p_options) {
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ERR_FAIL_COND_V(p_options.is_null() || p_options->is_server(), ERR_INVALID_PARAMETER);
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int authmode = MBEDTLS_SSL_VERIFY_REQUIRED;
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bool unsafe = p_options->is_unsafe_client();
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if (unsafe && p_options->get_trusted_ca_chain().is_valid()) {
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authmode = MBEDTLS_SSL_VERIFY_NONE;
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}
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Error err = _setup(MBEDTLS_SSL_IS_CLIENT, p_transport, authmode);
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ERR_FAIL_COND_V(err != OK, err);
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if (unsafe) {
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// No hostname verification for unsafe clients.
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mbedtls_ssl_set_hostname(&tls, nullptr);
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} else {
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String cn = p_options->get_common_name_override();
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if (cn.is_empty()) {
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cn = p_hostname;
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}
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mbedtls_ssl_set_hostname(&tls, cn.utf8().get_data());
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}
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X509CertificateMbedTLS *cas = nullptr;
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if (p_options->get_trusted_ca_chain().is_valid()) {
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// Locking CA certificates
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certs = p_options->get_trusted_ca_chain();
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certs->lock();
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cas = certs.ptr();
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} else {
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// Fall back to default certificates (no need to lock those).
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cas = CryptoMbedTLS::get_default_certificates();
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if (cas == nullptr) {
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clear();
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ERR_FAIL_V_MSG(ERR_UNCONFIGURED, "SSL module failed to initialize!");
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}
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}
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// Set valid CAs
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mbedtls_ssl_conf_ca_chain(&conf, &(cas->cert), nullptr);
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mbedtls_ssl_setup(&tls, &conf);
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return OK;
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}
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void TLSContextMbedTLS::clear() {
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if (!inited) {
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return;
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}
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mbedtls_ssl_free(&tls);
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mbedtls_ssl_config_free(&conf);
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mbedtls_ctr_drbg_free(&ctr_drbg);
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mbedtls_entropy_free(&entropy);
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// Unlock and key and certificates
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if (certs.is_valid()) {
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certs->unlock();
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}
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certs = Ref<X509Certificate>();
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if (pkey.is_valid()) {
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pkey->unlock();
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}
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pkey = Ref<CryptoKeyMbedTLS>();
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cookies = Ref<CookieContextMbedTLS>();
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inited = false;
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}
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mbedtls_ssl_context *TLSContextMbedTLS::get_context() {
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ERR_FAIL_COND_V(!inited, nullptr);
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return &tls;
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}
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TLSContextMbedTLS::TLSContextMbedTLS() {
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}
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TLSContextMbedTLS::~TLSContextMbedTLS() {
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clear();
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}
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