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![Rémi Verschelde](/assets/img/avatar_default.png)
As many open source projects have started doing it, we're removing the current year from the copyright notice, so that we don't need to bump it every year. It seems like only the first year of publication is technically relevant for copyright notices, and even that seems to be something that many companies stopped listing altogether (in a version controlled codebase, the commits are a much better source of date of publication than a hardcoded copyright statement). We also now list Godot Engine contributors first as we're collectively the current maintainers of the project, and we clarify that the "exclusive" copyright of the co-founders covers the timespan before opensourcing (their further contributions are included as part of Godot Engine contributors). Also fixed "cf." Frenchism - it's meant as "refer to / see".
453 lines
17 KiB
C++
453 lines
17 KiB
C++
/**************************************************************************/
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/* crypto_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 "crypto_mbedtls.h"
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#include "core/io/file_access.h"
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#include "core/config/engine.h"
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#include "core/config/project_settings.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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#ifdef TOOLS_ENABLED
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#include "editor/editor_settings.h"
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#endif
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#define PEM_BEGIN_CRT "-----BEGIN CERTIFICATE-----\n"
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#define PEM_END_CRT "-----END CERTIFICATE-----\n"
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#include <mbedtls/debug.h>
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#include <mbedtls/md.h>
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#include <mbedtls/pem.h>
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CryptoKey *CryptoKeyMbedTLS::create() {
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return memnew(CryptoKeyMbedTLS);
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}
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Error CryptoKeyMbedTLS::load(String p_path, bool p_public_only) {
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ERR_FAIL_COND_V_MSG(locks, ERR_ALREADY_IN_USE, "Key is in use");
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PackedByteArray out;
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Ref<FileAccess> f = FileAccess::open(p_path, FileAccess::READ);
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ERR_FAIL_COND_V_MSG(f.is_null(), ERR_INVALID_PARAMETER, "Cannot open CryptoKeyMbedTLS file '" + p_path + "'.");
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uint64_t flen = f->get_length();
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out.resize(flen + 1);
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f->get_buffer(out.ptrw(), flen);
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out.write[flen] = 0; // string terminator
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int ret = 0;
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if (p_public_only) {
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ret = mbedtls_pk_parse_public_key(&pkey, out.ptr(), out.size());
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} else {
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ret = mbedtls_pk_parse_key(&pkey, out.ptr(), out.size(), nullptr, 0);
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}
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// We MUST zeroize the memory for safety!
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mbedtls_platform_zeroize(out.ptrw(), out.size());
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ERR_FAIL_COND_V_MSG(ret, FAILED, "Error parsing key '" + itos(ret) + "'.");
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public_only = p_public_only;
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return OK;
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}
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Error CryptoKeyMbedTLS::save(String p_path, bool p_public_only) {
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Ref<FileAccess> f = FileAccess::open(p_path, FileAccess::WRITE);
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ERR_FAIL_COND_V_MSG(f.is_null(), ERR_INVALID_PARAMETER, "Cannot save CryptoKeyMbedTLS file '" + p_path + "'.");
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unsigned char w[16000];
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memset(w, 0, sizeof(w));
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int ret = 0;
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if (p_public_only) {
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ret = mbedtls_pk_write_pubkey_pem(&pkey, w, sizeof(w));
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} else {
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ret = mbedtls_pk_write_key_pem(&pkey, w, sizeof(w));
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}
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if (ret != 0) {
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mbedtls_platform_zeroize(w, sizeof(w)); // Zeroize anything we might have written.
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ERR_FAIL_V_MSG(FAILED, "Error writing key '" + itos(ret) + "'.");
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}
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size_t len = strlen((char *)w);
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f->store_buffer(w, len);
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mbedtls_platform_zeroize(w, sizeof(w)); // Zeroize temporary buffer.
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return OK;
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}
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Error CryptoKeyMbedTLS::load_from_string(String p_string_key, bool p_public_only) {
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int ret = 0;
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if (p_public_only) {
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ret = mbedtls_pk_parse_public_key(&pkey, (unsigned char *)p_string_key.utf8().get_data(), p_string_key.utf8().size());
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} else {
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ret = mbedtls_pk_parse_key(&pkey, (unsigned char *)p_string_key.utf8().get_data(), p_string_key.utf8().size(), nullptr, 0);
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}
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ERR_FAIL_COND_V_MSG(ret, FAILED, "Error parsing key '" + itos(ret) + "'.");
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public_only = p_public_only;
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return OK;
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}
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String CryptoKeyMbedTLS::save_to_string(bool p_public_only) {
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unsigned char w[16000];
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memset(w, 0, sizeof(w));
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int ret = 0;
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if (p_public_only) {
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ret = mbedtls_pk_write_pubkey_pem(&pkey, w, sizeof(w));
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} else {
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ret = mbedtls_pk_write_key_pem(&pkey, w, sizeof(w));
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}
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if (ret != 0) {
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mbedtls_platform_zeroize(w, sizeof(w));
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ERR_FAIL_V_MSG("", "Error saving key '" + itos(ret) + "'.");
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}
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String s = String::utf8((char *)w);
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return s;
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}
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X509Certificate *X509CertificateMbedTLS::create() {
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return memnew(X509CertificateMbedTLS);
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}
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Error X509CertificateMbedTLS::load(String p_path) {
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ERR_FAIL_COND_V_MSG(locks, ERR_ALREADY_IN_USE, "Certificate is in use");
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PackedByteArray out;
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Ref<FileAccess> f = FileAccess::open(p_path, FileAccess::READ);
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ERR_FAIL_COND_V_MSG(f.is_null(), ERR_INVALID_PARAMETER, "Cannot open X509CertificateMbedTLS file '" + p_path + "'.");
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uint64_t flen = f->get_length();
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out.resize(flen + 1);
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f->get_buffer(out.ptrw(), flen);
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out.write[flen] = 0; // string terminator
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int ret = mbedtls_x509_crt_parse(&cert, out.ptr(), out.size());
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ERR_FAIL_COND_V_MSG(ret, FAILED, "Error parsing some certificates: " + itos(ret));
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return OK;
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}
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Error X509CertificateMbedTLS::load_from_memory(const uint8_t *p_buffer, int p_len) {
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ERR_FAIL_COND_V_MSG(locks, ERR_ALREADY_IN_USE, "Certificate is in use");
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int ret = mbedtls_x509_crt_parse(&cert, p_buffer, p_len);
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ERR_FAIL_COND_V_MSG(ret, FAILED, "Error parsing certificates: " + itos(ret));
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return OK;
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}
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Error X509CertificateMbedTLS::save(String p_path) {
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Ref<FileAccess> f = FileAccess::open(p_path, FileAccess::WRITE);
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ERR_FAIL_COND_V_MSG(f.is_null(), ERR_INVALID_PARAMETER, "Cannot save X509CertificateMbedTLS file '" + p_path + "'.");
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mbedtls_x509_crt *crt = &cert;
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while (crt) {
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unsigned char w[4096];
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size_t wrote = 0;
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int ret = mbedtls_pem_write_buffer(PEM_BEGIN_CRT, PEM_END_CRT, cert.raw.p, cert.raw.len, w, sizeof(w), &wrote);
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if (ret != 0 || wrote == 0) {
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ERR_FAIL_V_MSG(FAILED, "Error writing certificate '" + itos(ret) + "'.");
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}
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f->store_buffer(w, wrote - 1); // don't write the string terminator
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crt = crt->next;
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}
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return OK;
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}
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bool HMACContextMbedTLS::is_md_type_allowed(mbedtls_md_type_t p_md_type) {
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switch (p_md_type) {
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case MBEDTLS_MD_SHA1:
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case MBEDTLS_MD_SHA256:
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return true;
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default:
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return false;
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}
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}
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HMACContext *HMACContextMbedTLS::create() {
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return memnew(HMACContextMbedTLS);
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}
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Error HMACContextMbedTLS::start(HashingContext::HashType p_hash_type, PackedByteArray p_key) {
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ERR_FAIL_COND_V_MSG(ctx != nullptr, ERR_FILE_ALREADY_IN_USE, "HMACContext already started.");
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// HMAC keys can be any size.
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ERR_FAIL_COND_V_MSG(p_key.is_empty(), ERR_INVALID_PARAMETER, "Key must not be empty.");
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hash_type = p_hash_type;
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mbedtls_md_type_t ht = CryptoMbedTLS::md_type_from_hashtype(p_hash_type, hash_len);
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bool allowed = HMACContextMbedTLS::is_md_type_allowed(ht);
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ERR_FAIL_COND_V_MSG(!allowed, ERR_INVALID_PARAMETER, "Unsupported hash type.");
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ctx = memalloc(sizeof(mbedtls_md_context_t));
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mbedtls_md_init((mbedtls_md_context_t *)ctx);
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mbedtls_md_setup((mbedtls_md_context_t *)ctx, mbedtls_md_info_from_type((mbedtls_md_type_t)ht), 1);
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int ret = mbedtls_md_hmac_starts((mbedtls_md_context_t *)ctx, (const uint8_t *)p_key.ptr(), (size_t)p_key.size());
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return ret ? FAILED : OK;
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}
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Error HMACContextMbedTLS::update(PackedByteArray p_data) {
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ERR_FAIL_COND_V_MSG(ctx == nullptr, ERR_INVALID_DATA, "Start must be called before update.");
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ERR_FAIL_COND_V_MSG(p_data.is_empty(), ERR_INVALID_PARAMETER, "Src must not be empty.");
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int ret = mbedtls_md_hmac_update((mbedtls_md_context_t *)ctx, (const uint8_t *)p_data.ptr(), (size_t)p_data.size());
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return ret ? FAILED : OK;
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}
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PackedByteArray HMACContextMbedTLS::finish() {
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ERR_FAIL_COND_V_MSG(ctx == nullptr, PackedByteArray(), "Start must be called before finish.");
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ERR_FAIL_COND_V_MSG(hash_len == 0, PackedByteArray(), "Unsupported hash type.");
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PackedByteArray out;
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out.resize(hash_len);
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unsigned char *out_ptr = (unsigned char *)out.ptrw();
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int ret = mbedtls_md_hmac_finish((mbedtls_md_context_t *)ctx, out_ptr);
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mbedtls_md_free((mbedtls_md_context_t *)ctx);
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memfree((mbedtls_md_context_t *)ctx);
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ctx = nullptr;
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hash_len = 0;
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ERR_FAIL_COND_V_MSG(ret, PackedByteArray(), "Error received while finishing HMAC");
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return out;
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}
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HMACContextMbedTLS::~HMACContextMbedTLS() {
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if (ctx != nullptr) {
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mbedtls_md_free((mbedtls_md_context_t *)ctx);
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memfree((mbedtls_md_context_t *)ctx);
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}
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}
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Crypto *CryptoMbedTLS::create() {
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return memnew(CryptoMbedTLS);
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}
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void CryptoMbedTLS::initialize_crypto() {
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#ifdef DEBUG_ENABLED
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mbedtls_debug_set_threshold(1);
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#endif
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Crypto::_create = create;
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Crypto::_load_default_certificates = load_default_certificates;
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X509CertificateMbedTLS::make_default();
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CryptoKeyMbedTLS::make_default();
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HMACContextMbedTLS::make_default();
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}
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void CryptoMbedTLS::finalize_crypto() {
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Crypto::_create = nullptr;
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Crypto::_load_default_certificates = nullptr;
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if (default_certs) {
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memdelete(default_certs);
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default_certs = nullptr;
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}
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X509CertificateMbedTLS::finalize();
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CryptoKeyMbedTLS::finalize();
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HMACContextMbedTLS::finalize();
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}
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CryptoMbedTLS::CryptoMbedTLS() {
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mbedtls_ctr_drbg_init(&ctr_drbg);
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mbedtls_entropy_init(&entropy);
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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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ERR_PRINT(" failed\n ! mbedtls_ctr_drbg_seed returned an error" + itos(ret));
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}
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}
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CryptoMbedTLS::~CryptoMbedTLS() {
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mbedtls_ctr_drbg_free(&ctr_drbg);
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mbedtls_entropy_free(&entropy);
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}
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X509CertificateMbedTLS *CryptoMbedTLS::default_certs = nullptr;
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X509CertificateMbedTLS *CryptoMbedTLS::get_default_certificates() {
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return default_certs;
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}
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void CryptoMbedTLS::load_default_certificates(String p_path) {
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ERR_FAIL_COND(default_certs != nullptr);
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default_certs = memnew(X509CertificateMbedTLS);
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ERR_FAIL_COND(default_certs == nullptr);
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if (!p_path.is_empty()) {
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// Use certs defined in project settings.
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default_certs->load(p_path);
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}
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#ifdef BUILTIN_CERTS_ENABLED
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else {
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// Use builtin certs only if user did not override it in project settings.
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PackedByteArray out;
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out.resize(_certs_uncompressed_size + 1);
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Compression::decompress(out.ptrw(), _certs_uncompressed_size, _certs_compressed, _certs_compressed_size, Compression::MODE_DEFLATE);
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out.write[_certs_uncompressed_size] = 0; // Make sure it ends with string terminator
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#ifdef DEBUG_ENABLED
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print_verbose("Loaded builtin certs");
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#endif
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default_certs->load_from_memory(out.ptr(), out.size());
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}
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#endif
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}
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Ref<CryptoKey> CryptoMbedTLS::generate_rsa(int p_bytes) {
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Ref<CryptoKeyMbedTLS> out;
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out.instantiate();
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int ret = mbedtls_pk_setup(&(out->pkey), mbedtls_pk_info_from_type(MBEDTLS_PK_RSA));
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ERR_FAIL_COND_V(ret != 0, nullptr);
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ret = mbedtls_rsa_gen_key(mbedtls_pk_rsa(out->pkey), mbedtls_ctr_drbg_random, &ctr_drbg, p_bytes, 65537);
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out->public_only = false;
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ERR_FAIL_COND_V(ret != 0, nullptr);
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return out;
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}
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Ref<X509Certificate> CryptoMbedTLS::generate_self_signed_certificate(Ref<CryptoKey> p_key, String p_issuer_name, String p_not_before, String p_not_after) {
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Ref<CryptoKeyMbedTLS> key = static_cast<Ref<CryptoKeyMbedTLS>>(p_key);
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ERR_FAIL_COND_V_MSG(key.is_null(), nullptr, "Invalid private key argument.");
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mbedtls_x509write_cert crt;
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mbedtls_x509write_crt_init(&crt);
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mbedtls_x509write_crt_set_subject_key(&crt, &(key->pkey));
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mbedtls_x509write_crt_set_issuer_key(&crt, &(key->pkey));
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mbedtls_x509write_crt_set_subject_name(&crt, p_issuer_name.utf8().get_data());
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mbedtls_x509write_crt_set_issuer_name(&crt, p_issuer_name.utf8().get_data());
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mbedtls_x509write_crt_set_version(&crt, MBEDTLS_X509_CRT_VERSION_3);
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mbedtls_x509write_crt_set_md_alg(&crt, MBEDTLS_MD_SHA256);
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mbedtls_mpi serial;
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mbedtls_mpi_init(&serial);
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uint8_t rand_serial[20];
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mbedtls_ctr_drbg_random(&ctr_drbg, rand_serial, 20);
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ERR_FAIL_COND_V(mbedtls_mpi_read_binary(&serial, rand_serial, 20), nullptr);
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mbedtls_x509write_crt_set_serial(&crt, &serial);
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mbedtls_x509write_crt_set_validity(&crt, p_not_before.utf8().get_data(), p_not_after.utf8().get_data());
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mbedtls_x509write_crt_set_basic_constraints(&crt, 1, -1);
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mbedtls_x509write_crt_set_basic_constraints(&crt, 1, 0);
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unsigned char buf[4096];
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memset(buf, 0, 4096);
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int ret = mbedtls_x509write_crt_pem(&crt, buf, 4096, mbedtls_ctr_drbg_random, &ctr_drbg);
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mbedtls_mpi_free(&serial);
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mbedtls_x509write_crt_free(&crt);
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ERR_FAIL_COND_V_MSG(ret != 0, nullptr, "Failed to generate certificate: " + itos(ret));
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buf[4095] = '\0'; // Make sure strlen can't fail.
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Ref<X509CertificateMbedTLS> out;
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out.instantiate();
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out->load_from_memory(buf, strlen((char *)buf) + 1); // Use strlen to find correct output size.
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return out;
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}
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PackedByteArray CryptoMbedTLS::generate_random_bytes(int p_bytes) {
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PackedByteArray out;
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out.resize(p_bytes);
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mbedtls_ctr_drbg_random(&ctr_drbg, out.ptrw(), p_bytes);
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return out;
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}
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mbedtls_md_type_t CryptoMbedTLS::md_type_from_hashtype(HashingContext::HashType p_hash_type, int &r_size) {
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switch (p_hash_type) {
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case HashingContext::HASH_MD5:
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r_size = 16;
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return MBEDTLS_MD_MD5;
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case HashingContext::HASH_SHA1:
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r_size = 20;
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return MBEDTLS_MD_SHA1;
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case HashingContext::HASH_SHA256:
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r_size = 32;
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return MBEDTLS_MD_SHA256;
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default:
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r_size = 0;
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ERR_FAIL_V_MSG(MBEDTLS_MD_NONE, "Invalid hash type.");
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}
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}
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Vector<uint8_t> CryptoMbedTLS::sign(HashingContext::HashType p_hash_type, Vector<uint8_t> p_hash, Ref<CryptoKey> p_key) {
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int size;
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mbedtls_md_type_t type = CryptoMbedTLS::md_type_from_hashtype(p_hash_type, size);
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ERR_FAIL_COND_V_MSG(type == MBEDTLS_MD_NONE, Vector<uint8_t>(), "Invalid hash type.");
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ERR_FAIL_COND_V_MSG(p_hash.size() != size, Vector<uint8_t>(), "Invalid hash provided. Size must be " + itos(size));
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Ref<CryptoKeyMbedTLS> key = static_cast<Ref<CryptoKeyMbedTLS>>(p_key);
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ERR_FAIL_COND_V_MSG(!key.is_valid(), Vector<uint8_t>(), "Invalid key provided.");
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|
ERR_FAIL_COND_V_MSG(key->is_public_only(), Vector<uint8_t>(), "Invalid key provided. Cannot sign with public_only keys.");
|
|
size_t sig_size = 0;
|
|
unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
|
|
Vector<uint8_t> out;
|
|
int ret = mbedtls_pk_sign(&(key->pkey), type, p_hash.ptr(), size, buf, &sig_size, mbedtls_ctr_drbg_random, &ctr_drbg);
|
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ERR_FAIL_COND_V_MSG(ret, out, "Error while signing: " + itos(ret));
|
|
out.resize(sig_size);
|
|
memcpy(out.ptrw(), buf, sig_size);
|
|
return out;
|
|
}
|
|
|
|
bool CryptoMbedTLS::verify(HashingContext::HashType p_hash_type, Vector<uint8_t> p_hash, Vector<uint8_t> p_signature, Ref<CryptoKey> p_key) {
|
|
int size;
|
|
mbedtls_md_type_t type = CryptoMbedTLS::md_type_from_hashtype(p_hash_type, size);
|
|
ERR_FAIL_COND_V_MSG(type == MBEDTLS_MD_NONE, false, "Invalid hash type.");
|
|
ERR_FAIL_COND_V_MSG(p_hash.size() != size, false, "Invalid hash provided. Size must be " + itos(size));
|
|
Ref<CryptoKeyMbedTLS> key = static_cast<Ref<CryptoKeyMbedTLS>>(p_key);
|
|
ERR_FAIL_COND_V_MSG(!key.is_valid(), false, "Invalid key provided.");
|
|
return mbedtls_pk_verify(&(key->pkey), type, p_hash.ptr(), size, p_signature.ptr(), p_signature.size()) == 0;
|
|
}
|
|
|
|
Vector<uint8_t> CryptoMbedTLS::encrypt(Ref<CryptoKey> p_key, Vector<uint8_t> p_plaintext) {
|
|
Ref<CryptoKeyMbedTLS> key = static_cast<Ref<CryptoKeyMbedTLS>>(p_key);
|
|
ERR_FAIL_COND_V_MSG(!key.is_valid(), Vector<uint8_t>(), "Invalid key provided.");
|
|
uint8_t buf[1024];
|
|
size_t size;
|
|
Vector<uint8_t> out;
|
|
int ret = mbedtls_pk_encrypt(&(key->pkey), p_plaintext.ptr(), p_plaintext.size(), buf, &size, sizeof(buf), mbedtls_ctr_drbg_random, &ctr_drbg);
|
|
ERR_FAIL_COND_V_MSG(ret, out, "Error while encrypting: " + itos(ret));
|
|
out.resize(size);
|
|
memcpy(out.ptrw(), buf, size);
|
|
return out;
|
|
}
|
|
|
|
Vector<uint8_t> CryptoMbedTLS::decrypt(Ref<CryptoKey> p_key, Vector<uint8_t> p_ciphertext) {
|
|
Ref<CryptoKeyMbedTLS> key = static_cast<Ref<CryptoKeyMbedTLS>>(p_key);
|
|
ERR_FAIL_COND_V_MSG(!key.is_valid(), Vector<uint8_t>(), "Invalid key provided.");
|
|
ERR_FAIL_COND_V_MSG(key->is_public_only(), Vector<uint8_t>(), "Invalid key provided. Cannot decrypt using a public_only key.");
|
|
uint8_t buf[2048];
|
|
size_t size;
|
|
Vector<uint8_t> out;
|
|
int ret = mbedtls_pk_decrypt(&(key->pkey), p_ciphertext.ptr(), p_ciphertext.size(), buf, &size, sizeof(buf), mbedtls_ctr_drbg_random, &ctr_drbg);
|
|
ERR_FAIL_COND_V_MSG(ret, out, "Error while decrypting: " + itos(ret));
|
|
out.resize(size);
|
|
memcpy(out.ptrw(), buf, size);
|
|
return out;
|
|
}
|