adba870534
Use a TLSOptions configuration object which is created via static functions. - "TLSOptions.client": uses the standard CA and common name verification. - "TLSOptions.client_unsafe": uses optional CA verification (i.e. if specified) - "TLSOptions.server": is the standard server configuration (chain + key) This will allow us to expand the TLS configuration options to include e.g. mutual authentication without bloating the classes that uses StreamPeerTLS and PacketPeerDTLS as underlying peers.
259 lines
10 KiB
C++
259 lines
10 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) 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 "crypto.h"
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#include "core/config/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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/// TLSOptions
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Ref<TLSOptions> TLSOptions::client(Ref<X509Certificate> p_trusted_chain, const String &p_common_name_override) {
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Ref<TLSOptions> opts;
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opts.instantiate();
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opts->trusted_ca_chain = p_trusted_chain;
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opts->common_name = p_common_name_override;
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opts->verify_mode = TLS_VERIFY_FULL;
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return opts;
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}
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Ref<TLSOptions> TLSOptions::client_unsafe(Ref<X509Certificate> p_trusted_chain) {
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Ref<TLSOptions> opts;
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opts.instantiate();
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opts->trusted_ca_chain = p_trusted_chain;
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if (p_trusted_chain.is_null()) {
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opts->verify_mode = TLS_VERIFY_NONE;
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} else {
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opts->verify_mode = TLS_VERIFY_CERT;
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}
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return opts;
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}
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Ref<TLSOptions> TLSOptions::server(Ref<CryptoKey> p_own_key, Ref<X509Certificate> p_own_certificate) {
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Ref<TLSOptions> opts;
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opts.instantiate();
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opts->server_mode = true;
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opts->own_certificate = p_own_certificate;
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opts->private_key = p_own_key;
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opts->verify_mode = TLS_VERIFY_NONE;
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return opts;
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}
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void TLSOptions::_bind_methods() {
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ClassDB::bind_static_method("TLSOptions", D_METHOD("client", "trusted_chain", "common_name_override"), &TLSOptions::client, DEFVAL(Ref<X509Certificate>()), DEFVAL(String()));
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ClassDB::bind_static_method("TLSOptions", D_METHOD("client_unsafe", "trusted_chain"), &TLSOptions::client_unsafe, DEFVAL(Ref<X509Certificate>()));
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ClassDB::bind_static_method("TLSOptions", D_METHOD("server", "key", "certificate"), &TLSOptions::server);
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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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PackedByteArray Crypto::hmac_digest(HashingContext::HashType p_hash_type, PackedByteArray p_key, PackedByteArray 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(), PackedByteArray(), "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, PackedByteArray());
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err = ctx->update(p_msg);
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ERR_FAIL_COND_V(err != OK, PackedByteArray());
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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 attacks.
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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(PackedByteArray p_trusted, PackedByteArray p_received) {
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const uint8_t *t = p_trusted.ptr();
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const uint8_t *r = p_received.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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/// Resource loader/saver
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Ref<Resource> ResourceFormatLoaderCrypto::load(const String &p_path, const String &p_original_path, Error *r_error, bool p_use_sub_threads, float *r_progress, CacheMode p_cache_mode) {
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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 Ref<Resource> &p_resource, const String &p_path, 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 Ref<Resource> &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 Ref<Resource> &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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