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/********************************************************************
This file is part of the KDE project.
Copyright (C) 2011 Martin Gräßlin <mgraesslin@kde.org>
This program 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 2 of the License, or
(at your option) any later version.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*********************************************************************/
#include <KLocalizedString>
#include <KQuickAddons/QtQuickSettings>
#include <QDateTime>
#include <QCommandLineParser>
#include <QSessionManager>
#include <iostream>
#include <signal.h>
#include "greeterapp.h"
#include <config-kscreenlocker.h>
#if HAVE_SYS_PRCTL_H
#include <sys/prctl.h>
#endif
#if HAVE_SYS_PROCCTL_H
#include <unistd.h>
#include <sys/procctl.h>
#endif
#if HAVE_SECCOMP
#include "seccomp_filter.h"
#endif
static void signalHandler(int signum)
{
ScreenLocker::UnlockApp *instance = qobject_cast<ScreenLocker::UnlockApp *>(QCoreApplication::instance());
if (!instance)
return;
switch(signum)
{
case SIGTERM:
// exit gracefully to not leave behind screensaver processes (bug#224200)
// return exit code 1 to indicate that a valid password was not entered,
// to prevent circumventing the password input by sending a SIGTERM
instance->exit(1);
break;
case SIGUSR1:
instance->lockImmediately();
break;
}
}
int main(int argc, char* argv[])
{
// disable ptrace on the greeter
#if HAVE_PR_SET_DUMPABLE
prctl(PR_SET_DUMPABLE, 0);
#endif
#if HAVE_PROC_TRACE_CTL
int mode = PROC_TRACE_CTL_DISABLE;
procctl(P_PID, getpid(), PROC_TRACE_CTL, &mode);
#endif
KLocalizedString::setApplicationDomain("kscreenlocker_greet");
// explicitly disable input methods as it makes it impossible to unlock, see BUG 306932
// but explicitly set on screen keyboard such as maliit is allowed
if (!qEnvironmentVariableIsSet("QT_IM_MODULE") || (qEnvironmentVariableIsSet("QT_IM_MODULE") && qgetenv("QT_IM_MODULE") != QByteArrayLiteral("maliit"))) {
qputenv("QT_IM_MODULE", QByteArrayLiteral("qtvirtualkeyboard"));
}
ScreenLocker::UnlockApp app(argc, argv);
app.setQuitOnLastWindowClosed(false);
QCoreApplication::setApplicationName(QStringLiteral("kscreenlocker_greet"));
QCoreApplication::setApplicationVersion(QStringLiteral("0.1"));
QCoreApplication::setOrganizationDomain(QStringLiteral("kde.org"));
KQuickAddons::QtQuickSettings::init();
// disable session management for the greeter
auto disableSessionManagement = [](QSessionManager &sm) {
sm.setRestartHint(QSessionManager::RestartNever);
};
QObject::connect(&app, &QGuiApplication::commitDataRequest, disableSessionManagement);
QObject::connect(&app, &QGuiApplication::saveStateRequest, disableSessionManagement);
QCommandLineParser parser;
parser.setApplicationDescription(i18n("Greeter for the KDE Plasma Workspaces Screen locker"));
parser.addHelpOption();
parser.addVersionOption();
QCommandLineOption testingOption(QStringLiteral("testing"),
i18n("Starts the greeter in testing mode"));
QCommandLineOption themeOption(QStringLiteral("theme"),
i18n("Starts the greeter with the selected theme (only in Testing mode)"),
QStringLiteral("theme"),
QStringLiteral(""));
QCommandLineOption immediateLockOption(QStringLiteral("immediateLock"),
i18n("Lock immediately, ignoring any grace time etc."));
QCommandLineOption graceTimeOption(QStringLiteral("graceTime"),
i18n("Delay till the lock user interface gets shown in milliseconds."),
QStringLiteral("milliseconds"),
QStringLiteral("0"));
QCommandLineOption nolockOption(QStringLiteral("nolock"),
i18n("Don't show any lock user interface."));
QCommandLineOption switchUserOption(QStringLiteral("switchuser"),
i18n("Default to the switch user UI."));
QCommandLineOption waylandFdOption(QStringLiteral("ksldfd"),
i18n("File descriptor for connecting to ksld."),
QStringLiteral("fd"));
parser.addOption(testingOption);
parser.addOption(themeOption);
parser.addOption(immediateLockOption);
parser.addOption(graceTimeOption);
parser.addOption(nolockOption);
parser.addOption(switchUserOption);
parser.addOption(waylandFdOption);
parser.process(app);
if (parser.isSet(testingOption)) {
app.setTesting(true);
app.setImmediateLock(true);
//parse theme option
const QString theme = parser.value(themeOption);
if (!theme.isEmpty()) {
app.setTheme(theme);
}
// allow ptrace if testing is enabled
#if HAVE_PR_SET_DUMPABLE
prctl(PR_SET_DUMPABLE, 1);
#endif
#if HAVE_PROC_TRACE_CTL
int mode = PROC_TRACE_CTL_ENABLE;
procctl(P_PID, getpid(), PROC_TRACE_CTL, &mode);
#endif
} else {
app.setImmediateLock(parser.isSet(immediateLockOption));
}
app.setNoLock(parser.isSet(nolockOption));
bool ok = false;
int graceTime = parser.value(graceTimeOption).toInt(&ok);
if (ok) {
app.setGraceTime(graceTime);
}
if (parser.isSet(switchUserOption)) {
app.setDefaultToSwitchUser(true);
}
if (parser.isSet(waylandFdOption)) {
ok = false;
const int fd = parser.value(waylandFdOption).toInt(&ok);
if (ok) {
app.setKsldSocket(fd);
}
}
// init the sandbox
#if HAVE_SECCOMP
if (app.supportsSeccomp()) {
ScreenLocker::SecComp::init();
}
#endif
app.desktopResized();
// This allow ksmserver to know when the applicaion has actually finished setting itself up.
// Crucial for blocking until it is ready, ensuring locking happens before sleep, e.g.
std::cout << "Locked at " << QDateTime::currentDateTime().toTime_t() << std::endl;
struct sigaction sa;
sa.sa_handler = signalHandler;
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
sigaction(SIGTERM, &sa, nullptr);
sigaction(SIGUSR1, &sa, nullptr);
return app.exec();
}
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