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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 "core/function/PassphraseGenerator.h"
#include "core/utils/IOUtils.h"
namespace GpgFrontend {
void DataObjectOperator::init_app_secure_key() {
GF_CORE_LOG_INFO("initializing application secure key...");
WriteFile(app_secure_key_path_,
PassphraseGenerator::GetInstance().Generate(256).toUtf8());
QFile::setPermissions(app_secure_key_path_,
QFileDevice::ReadOwner | QFileDevice::WriteOwner);
}
DataObjectOperator::DataObjectOperator(int channel)
: SingletonFunctionObject<DataObjectOperator>(channel) {
if (!QDir(app_secure_path_).exists()) QDir(app_secure_path_).mkpath(".");
if (!QFileInfo(app_secure_key_path_).exists()) init_app_secure_key();
QByteArray key;
if (!ReadFile(app_secure_key_path_, key)) {
GF_CORE_LOG_ERROR("failed to read app secure key file: {}",
app_secure_key_path_);
// unsafe mode
key = {};
}
hash_key_ = QCryptographicHash::hash(key, QCryptographicHash::Sha256);
if (!QDir(app_data_objs_path_).exists()) {
QDir(app_data_objs_path_).mkpath(".");
}
}
auto DataObjectOperator::SaveDataObj(const QString& key,
const QJsonDocument& value) -> QString {
QByteArray hash_obj_key = {};
if (key.isEmpty()) {
hash_obj_key =
QCryptographicHash::hash(
hash_key_ +
PassphraseGenerator::GetInstance().Generate(32).toUtf8() +
QDateTime::currentDateTime().toString().toUtf8(),
QCryptographicHash::Sha256)
.toHex();
} else {
hash_obj_key = QCryptographicHash::hash(hash_key_ + key.toUtf8(),
QCryptographicHash::Sha256)
.toHex();
}
const auto target_obj_path = app_data_objs_path_ + "/" + hash_obj_key;
auto encoded_data =
QAESEncryption(QAESEncryption::AES_256, QAESEncryption::ECB,
QAESEncryption::Padding::ISO)
.encode(value.toJson(), hash_key_);
GF_CORE_LOG_TRACE("saving data object {} to disk {} , size: {} bytes",
hash_obj_key, target_obj_path, encoded_data.size());
// recreate if not exists
if (!QDir(app_data_objs_path_).exists()) {
QDir(app_data_objs_path_).mkpath(".");
}
if (!WriteFile(target_obj_path, encoded_data)) {
GF_CORE_LOG_ERROR("failed to write data object to disk: {}", key);
}
return key.isEmpty() ? hash_obj_key : QString();
}
auto DataObjectOperator::GetDataObject(const QString& key)
-> std::optional<QJsonDocument> {
try {
GF_CORE_LOG_TRACE("try to get data object from disk, key: {}", key);
auto hash_obj_key = QCryptographicHash::hash(hash_key_ + key.toUtf8(),
QCryptographicHash::Sha256)
.toHex();
const auto obj_path = app_data_objs_path_ + "/" + hash_obj_key;
if (!QFileInfo(obj_path).exists()) {
GF_CORE_LOG_WARN("data object not found from disk, key: {}", key);
return {};
}
QByteArray encoded_data;
if (!ReadFile(obj_path, encoded_data)) {
GF_CORE_LOG_ERROR("failed to read data object from disk, key: {}", key);
return {};
}
QAESEncryption encryption(QAESEncryption::AES_256, QAESEncryption::ECB,
QAESEncryption::Padding::ISO);
auto decoded_data =
encryption.removePadding(encryption.decode(encoded_data, hash_key_));
GF_CORE_LOG_TRACE("data object has been decoded, key: {}, data: {}", key,
decoded_data);
return QJsonDocument::fromJson(decoded_data);
} catch (...) {
GF_CORE_LOG_ERROR("failed to get data object, caught exception: {}", key);
return {};
}
}
auto DataObjectOperator::GetDataObjectByRef(const QString& _ref)
-> std::optional<QJsonDocument> {
if (_ref.size() != 64) return {};
try {
const auto& hash_obj_key = _ref;
const auto obj_path = app_data_objs_path_ + "/" + hash_obj_key;
if (!QFileInfo(obj_path).exists()) return {};
QByteArray encoded_data;
if (!ReadFile(obj_path, encoded_data)) return {};
QAESEncryption encryption(QAESEncryption::AES_256, QAESEncryption::ECB,
QAESEncryption::Padding::ISO);
auto decoded_data =
encryption.removePadding(encryption.decode(encoded_data, hash_key_));
return QJsonDocument::fromJson(decoded_data);
} catch (...) {
return {};
}
}
} // namespace GpgFrontend
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