223 lines
8.6 KiB
C++
223 lines
8.6 KiB
C++
/*************************************************************************/
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/* crypto.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) 2007-2022 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
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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 "crypto.h"
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#include "core/engine.h"
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#include "core/io/certs_compressed.gen.h"
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#include "core/io/compression.h"
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/// Resources
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CryptoKey *(*CryptoKey::_create)() = nullptr;
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CryptoKey *CryptoKey::create() {
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if (_create) {
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return _create();
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}
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return nullptr;
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}
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void CryptoKey::_bind_methods() {
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ClassDB::bind_method(D_METHOD("save", "path", "public_only"), &CryptoKey::save, DEFVAL(false));
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ClassDB::bind_method(D_METHOD("load", "path", "public_only"), &CryptoKey::load, DEFVAL(false));
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ClassDB::bind_method(D_METHOD("is_public_only"), &CryptoKey::is_public_only);
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ClassDB::bind_method(D_METHOD("save_to_string", "public_only"), &CryptoKey::save_to_string, DEFVAL(false));
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ClassDB::bind_method(D_METHOD("load_from_string", "string_key", "public_only"), &CryptoKey::load_from_string, DEFVAL(false));
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}
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X509Certificate *(*X509Certificate::_create)() = nullptr;
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X509Certificate *X509Certificate::create() {
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if (_create) {
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return _create();
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}
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return nullptr;
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}
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void X509Certificate::_bind_methods() {
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ClassDB::bind_method(D_METHOD("save", "path"), &X509Certificate::save);
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ClassDB::bind_method(D_METHOD("load", "path"), &X509Certificate::load);
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}
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/// HMACContext
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void HMACContext::_bind_methods() {
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ClassDB::bind_method(D_METHOD("start", "hash_type", "key"), &HMACContext::start);
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ClassDB::bind_method(D_METHOD("update", "data"), &HMACContext::update);
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ClassDB::bind_method(D_METHOD("finish"), &HMACContext::finish);
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}
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HMACContext *(*HMACContext::_create)() = nullptr;
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HMACContext *HMACContext::create() {
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if (_create) {
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return _create();
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}
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ERR_FAIL_V_MSG(nullptr, "HMACContext is not available when the mbedtls module is disabled.");
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}
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/// Crypto
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void (*Crypto::_load_default_certificates)(String p_path) = nullptr;
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Crypto *(*Crypto::_create)() = nullptr;
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Crypto *Crypto::create() {
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if (_create) {
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return _create();
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}
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ERR_FAIL_V_MSG(nullptr, "Crypto is not available when the mbedtls module is disabled.");
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}
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void Crypto::load_default_certificates(String p_path) {
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if (_load_default_certificates) {
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_load_default_certificates(p_path);
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}
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}
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PoolByteArray Crypto::hmac_digest(HashingContext::HashType p_hash_type, PoolByteArray p_key, PoolByteArray p_msg) {
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Ref<HMACContext> ctx = Ref<HMACContext>(HMACContext::create());
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ERR_FAIL_COND_V_MSG(ctx.is_null(), PoolByteArray(), "HMAC is not available without mbedtls module.");
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Error err = ctx->start(p_hash_type, p_key);
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ERR_FAIL_COND_V(err != OK, PoolByteArray());
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err = ctx->update(p_msg);
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ERR_FAIL_COND_V(err != OK, PoolByteArray());
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return ctx->finish();
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}
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// Compares two HMACS for equality without leaking timing information in order to prevent timing attakcs.
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// @see: https://paragonie.com/blog/2015/11/preventing-timing-attacks-on-string-comparison-with-double-hmac-strategy
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bool Crypto::constant_time_compare(PoolByteArray p_trusted, PoolByteArray p_received) {
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const uint8_t *t = p_trusted.read().ptr();
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const uint8_t *r = p_received.read().ptr();
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int tlen = p_trusted.size();
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int rlen = p_received.size();
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// If the lengths are different then nothing else matters.
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if (tlen != rlen) {
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return false;
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}
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uint8_t v = 0;
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for (int i = 0; i < tlen; i++) {
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v |= t[i] ^ r[i];
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}
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return v == 0;
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}
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void Crypto::_bind_methods() {
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ClassDB::bind_method(D_METHOD("generate_random_bytes", "size"), &Crypto::generate_random_bytes);
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ClassDB::bind_method(D_METHOD("generate_rsa", "size"), &Crypto::generate_rsa);
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ClassDB::bind_method(D_METHOD("generate_self_signed_certificate", "key", "issuer_name", "not_before", "not_after"), &Crypto::generate_self_signed_certificate, DEFVAL("CN=myserver,O=myorganisation,C=IT"), DEFVAL("20140101000000"), DEFVAL("20340101000000"));
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ClassDB::bind_method(D_METHOD("sign", "hash_type", "hash", "key"), &Crypto::sign);
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ClassDB::bind_method(D_METHOD("verify", "hash_type", "hash", "signature", "key"), &Crypto::verify);
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ClassDB::bind_method(D_METHOD("encrypt", "key", "plaintext"), &Crypto::encrypt);
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ClassDB::bind_method(D_METHOD("decrypt", "key", "ciphertext"), &Crypto::decrypt);
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ClassDB::bind_method(D_METHOD("hmac_digest", "hash_type", "key", "msg"), &Crypto::hmac_digest);
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ClassDB::bind_method(D_METHOD("constant_time_compare", "trusted", "received"), &Crypto::constant_time_compare);
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}
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Crypto::Crypto() {
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}
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/// Resource loader/saver
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RES ResourceFormatLoaderCrypto::load(const String &p_path, const String &p_original_path, Error *r_error, bool p_no_subresource_cache) {
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String el = p_path.get_extension().to_lower();
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if (el == "crt") {
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X509Certificate *cert = X509Certificate::create();
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if (cert) {
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cert->load(p_path);
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}
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return cert;
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} else if (el == "key") {
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CryptoKey *key = CryptoKey::create();
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if (key) {
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key->load(p_path, false);
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}
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return key;
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} else if (el == "pub") {
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CryptoKey *key = CryptoKey::create();
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if (key) {
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key->load(p_path, true);
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}
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return key;
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}
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return nullptr;
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}
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void ResourceFormatLoaderCrypto::get_recognized_extensions(List<String> *p_extensions) const {
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p_extensions->push_back("crt");
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p_extensions->push_back("key");
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p_extensions->push_back("pub");
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}
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bool ResourceFormatLoaderCrypto::handles_type(const String &p_type) const {
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return p_type == "X509Certificate" || p_type == "CryptoKey";
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}
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String ResourceFormatLoaderCrypto::get_resource_type(const String &p_path) const {
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String el = p_path.get_extension().to_lower();
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if (el == "crt") {
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return "X509Certificate";
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} else if (el == "key" || el == "pub") {
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return "CryptoKey";
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}
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return "";
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}
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Error ResourceFormatSaverCrypto::save(const String &p_path, const RES &p_resource, uint32_t p_flags) {
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Error err;
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Ref<X509Certificate> cert = p_resource;
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Ref<CryptoKey> key = p_resource;
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if (cert.is_valid()) {
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err = cert->save(p_path);
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} else if (key.is_valid()) {
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String el = p_path.get_extension().to_lower();
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err = key->save(p_path, el == "pub");
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} else {
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ERR_FAIL_V(ERR_INVALID_PARAMETER);
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}
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ERR_FAIL_COND_V_MSG(err != OK, err, "Cannot save Crypto resource to file '" + p_path + "'.");
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return OK;
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}
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void ResourceFormatSaverCrypto::get_recognized_extensions(const RES &p_resource, List<String> *p_extensions) const {
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const X509Certificate *cert = Object::cast_to<X509Certificate>(*p_resource);
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const CryptoKey *key = Object::cast_to<CryptoKey>(*p_resource);
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if (cert) {
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p_extensions->push_back("crt");
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}
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if (key) {
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if (!key->is_public_only()) {
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p_extensions->push_back("key");
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}
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p_extensions->push_back("pub");
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}
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}
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bool ResourceFormatSaverCrypto::recognize(const RES &p_resource) const {
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return Object::cast_to<X509Certificate>(*p_resource) || Object::cast_to<CryptoKey>(*p_resource);
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}
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