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