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/**
* Copyright (C) 2021-2024 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 "GpgAutomatonHandler.h"
#include "core/model/GpgData.h"
#include "core/model/GpgKey.h"
#include "core/utils/GpgUtils.h"
namespace GpgFrontend {
GpgAutomatonHandler::GpgAutomatonHandler(int channel)
: SingletonFunctionObject<GpgAutomatonHandler>(channel) {}
auto InteratorCbFunc(void* handle, const char* status, const char* args,
int fd) -> gpgme_error_t {
auto* handle_struct = static_cast<AutomatonHandelStruct*>(handle);
QString status_s = status;
QString args_s = args;
if (status_s == "KEY_CONSIDERED") {
auto tokens = QString(args).split(' ');
if (handle_struct->KeyFpr().isEmpty()) return 0;
if (tokens.empty() || tokens[0] != handle_struct->KeyFpr()) {
LOG_W() << "handle struct key fpr: " << handle_struct->KeyFpr()
<< "mismatch token: " << tokens[0] << ", exit...";
return -1;
}
return 0;
}
if (status_s == "CARDCTRL") {
auto tokens = QString(args).split(' ');
if (handle_struct->SerialNumber().isEmpty()) return 0;
if (tokens.empty() || tokens[0] != handle_struct->SerialNumber()) {
LOG_W() << "handle struct serial number: "
<< handle_struct->SerialNumber()
<< "mismatch token: " << tokens[0] << ", exit...";
return -1;
}
return 0;
}
if (status_s == "GOT_IT" || status_s.isEmpty()) {
FLOG_D("gpg reply is GOT_IT, continue...");
return 0;
}
LOG_D() << "current state" << handle_struct->CurrentStatus()
<< "gpg status: " << status_s << ", args: " << args_s;
handle_struct->SetPromptStatus(status_s, args_s);
AutomatonState next_state = handle_struct->NextState(status_s, args_s);
if (next_state == GpgAutomatonHandler::kAS_ERROR) {
FLOG_D("handle struct next state caught error, abort...");
return -1;
}
LOG_D() << "next state" << next_state;
if (next_state == GpgAutomatonHandler::kAS_SAVE) {
handle_struct->SetSuccess(true);
}
// set state and preform action
handle_struct->SetStatus(next_state);
GpgAutomatonHandler::Command cmd = handle_struct->Action();
LOG_D() << "next action, cmd:" << cmd;
if (!cmd.isEmpty()) {
auto btye_array = cmd.toUtf8();
gpgme_io_write(fd, btye_array, btye_array.size());
gpgme_io_write(fd, "\n", 1);
} else if (status_s.startsWith("GET_")) {
// avoid trapping in this state
return GPG_ERR_FALSE;
}
return 0;
}
auto DoInteractImpl(GpgContext& ctx_, const GpgKeyPtr& key, bool card_edit,
const QString& id,
AutomatonNextStateHandler next_state_handler,
AutomatonActionHandler action_handler, int flags) -> bool {
gpgme_key_t p_key = key == nullptr ? nullptr : static_cast<gpgme_key_t>(*key);
AutomatonHandelStruct handel_struct(card_edit, id);
handel_struct.SetHandler(std::move(next_state_handler),
std::move(action_handler));
GpgData data_out;
auto err =
gpgme_op_interact(ctx_.DefaultContext(), p_key, flags, InteratorCbFunc,
static_cast<void*>(&handel_struct), data_out);
return CheckGpgError(err) == GPG_ERR_NO_ERROR && handel_struct.Success();
}
auto GpgAutomatonHandler::DoInteract(
const GpgKeyPtr& key, AutomatonNextStateHandler next_state_handler,
AutomatonActionHandler action_handler, int flags) -> bool {
assert(key != nullptr);
if (key == nullptr) return false;
return DoInteractImpl(ctx_, key, false, key->ID(),
std::move(next_state_handler),
std::move(action_handler), flags);
}
auto GpgAutomatonHandler::DoCardInteract(
const QString& serial_number, AutomatonNextStateHandler next_state_handler,
AutomatonActionHandler action_handler) -> bool {
return DoInteractImpl(ctx_, nullptr, true, serial_number,
std::move(next_state_handler),
std::move(action_handler), GPGME_INTERACT_CARD);
}
auto GpgAutomatonHandler::AutomatonHandelStruct::NextState(
QString gpg_status, QString args) -> AutomatonState {
return next_state_handler_(current_state_, std::move(gpg_status),
std::move(args));
}
void GpgAutomatonHandler::AutomatonHandelStruct::SetHandler(
AutomatonNextStateHandler next_state_handler,
AutomatonActionHandler action_handler) {
next_state_handler_ = std::move(next_state_handler);
action_handler_ = std::move(action_handler);
}
auto GpgAutomatonHandler::AutomatonHandelStruct::CurrentStatus() const
-> AutomatonState {
return current_state_;
}
void GpgAutomatonHandler::AutomatonHandelStruct::SetStatus(
AutomatonState next_state) {
current_state_ = next_state;
}
auto GpgAutomatonHandler::AutomatonHandelStruct::Action() -> Command {
return action_handler_(*this, current_state_);
}
void GpgAutomatonHandler::AutomatonHandelStruct::SetSuccess(bool success) {
success_ = success;
}
auto GpgAutomatonHandler::AutomatonHandelStruct::Success() const -> bool {
return success_;
}
auto GpgAutomatonHandler::AutomatonHandelStruct::KeyFpr() const -> QString {
return card_edit_ ? "" : id_;
}
GpgAutomatonHandler::AutomatonHandelStruct::AutomatonHandelStruct(
bool card_edit, QString id)
: card_edit_(card_edit), id_(std::move(id)) {}
auto GpgAutomatonHandler::AutomatonHandelStruct::PromptStatus() const
-> std::tuple<QString, QString> {
return {prompt_status_, prompt_args_};
}
void GpgAutomatonHandler::AutomatonHandelStruct::SetPromptStatus(QString status,
QString args) {
prompt_status_ = std::move(status);
prompt_args_ = std::move(args);
}
auto GpgAutomatonHandler::AutomatonHandelStruct::SerialNumber() const
-> QString {
return card_edit_ ? id_ : "";
}
} // namespace GpgFrontend
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