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/**
* Copyright (C) 2021 Saturneric <[email protected]>
*
* This file is part of GpgFrontend.
*
* GpgFrontend is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GpgFrontend is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GpgFrontend. If not, see <https://www.gnu.org/licenses/>.
*
* The initial version of the source code is inherited from
* the gpg4usb project, which is under GPL-3.0-or-later.
*
* All the source code of GpgFrontend was modified and released by
* Saturneric <[email protected]> starting on May 12, 2021.
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#include "DataObjectOperator.h"
#include <qt-aes/qaesencryption.h>
#include <boost/date_time.hpp>
#include "core/function/PassphraseGenerator.h"
#include "core/utils/IOUtils.h"
namespace GpgFrontend {
void DataObjectOperator::init_app_secure_key() {
GF_CORE_LOG_TRACE("initializing application secure key");
WriteFileStd(app_secure_key_path_,
PassphraseGenerator::GetInstance().Generate(256));
std::filesystem::permissions(
app_secure_key_path_,
std::filesystem::perms::owner_read | std::filesystem::perms::owner_write);
}
DataObjectOperator::DataObjectOperator(int channel)
: SingletonFunctionObject<DataObjectOperator>(channel) {
if (!is_directory(app_secure_path_)) create_directory(app_secure_path_);
if (!exists(app_secure_key_path_)) {
init_app_secure_key();
}
std::string key;
if (!ReadFileStd(app_secure_key_path_.u8string(), key)) {
GF_CORE_LOG_ERROR("failed to read app secure key file: {}",
app_secure_key_path_.u8string());
throw std::runtime_error("failed to read app secure key file");
}
hash_key_ = QCryptographicHash::hash(QByteArray::fromStdString(key),
QCryptographicHash::Sha256);
GF_CORE_LOG_TRACE("app secure key loaded {} bytes", hash_key_.size());
if (!exists(app_data_objs_path_)) create_directory(app_data_objs_path_);
}
auto DataObjectOperator::SaveDataObj(const std::string& _key,
const nlohmann::json& value)
-> std::string {
std::string hash_obj_key = {};
if (_key.empty()) {
hash_obj_key =
QCryptographicHash::hash(
hash_key_ + QByteArray::fromStdString(
PassphraseGenerator::GetInstance().Generate(32) +
to_iso_extended_string(
boost::posix_time::second_clock::local_time())),
QCryptographicHash::Sha256)
.toHex()
.toStdString();
} else {
hash_obj_key =
QCryptographicHash::hash(hash_key_ + QByteArray::fromStdString(_key),
QCryptographicHash::Sha256)
.toHex()
.toStdString();
}
const auto obj_path = app_data_objs_path_ / hash_obj_key;
QAESEncryption encryption(QAESEncryption::AES_256, QAESEncryption::ECB,
QAESEncryption::Padding::ISO);
auto encoded =
encryption.encode(QByteArray::fromStdString(to_string(value)), hash_key_);
GF_CORE_LOG_TRACE("saving data object {} to {} , size: {} bytes",
hash_obj_key, obj_path.u8string(), encoded.size());
WriteFileStd(obj_path.u8string(), encoded.toStdString());
return _key.empty() ? hash_obj_key : std::string();
}
auto DataObjectOperator::GetDataObject(const std::string& _key)
-> std::optional<nlohmann::json> {
try {
GF_CORE_LOG_TRACE("get data object from disk {}", _key);
auto hash_obj_key =
QCryptographicHash::hash(hash_key_ + QByteArray::fromStdString(_key),
QCryptographicHash::Sha256)
.toHex()
.toStdString();
const auto obj_path = app_data_objs_path_ / hash_obj_key;
if (!std::filesystem::exists(obj_path)) {
GF_CORE_LOG_WARN("data object not found, key: {}", _key);
return {};
}
std::string buffer;
if (!ReadFileStd(obj_path.u8string(), buffer)) {
GF_CORE_LOG_ERROR("failed to read data object, key: {}", _key);
return {};
}
auto encoded = QByteArray::fromStdString(buffer);
QAESEncryption encryption(QAESEncryption::AES_256, QAESEncryption::ECB,
QAESEncryption::Padding::ISO);
GF_CORE_LOG_TRACE("decrypting data object {} , hash key size: {}",
encoded.size(), hash_key_.size());
auto decoded =
encryption.removePadding(encryption.decode(encoded, hash_key_));
GF_CORE_LOG_TRACE("data object decoded: {}", _key);
return nlohmann::json::parse(decoded.toStdString());
} catch (...) {
GF_CORE_LOG_ERROR("failed to get data object, caught exception: {}", _key);
return {};
}
}
auto DataObjectOperator::GetDataObjectByRef(const std::string& _ref)
-> std::optional<nlohmann::json> {
if (_ref.size() != 64) return {};
try {
const auto& hash_obj_key = _ref;
const auto obj_path = app_data_objs_path_ / hash_obj_key;
if (!std::filesystem::exists(obj_path)) return {};
std::string buffer;
if (!ReadFileStd(obj_path.u8string(), buffer)) return {};
auto encoded = QByteArray::fromStdString(buffer);
QAESEncryption encryption(QAESEncryption::AES_256, QAESEncryption::ECB,
QAESEncryption::Padding::ISO);
auto decoded =
encryption.removePadding(encryption.decode(encoded, hash_key_));
return nlohmann::json::parse(decoded.toStdString());
} catch (...) {
return {};
}
}
} // namespace GpgFrontend
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