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/*
SPDX-FileCopyrightText: 2011 Martin Gräßlin <mgraesslin@kde.org>
SPDX-FileCopyrightText: 2023 Harald Sitter <sitter@kde.org>
SPDX-License-Identifier: GPL-2.0-or-later
*/
#include <KLocalizedString>
#include <QCommandLineParser>
#include <QDateTime>
#include <QSessionManager>
#include <QSurfaceFormat>
#include <iostream>
#include <signal.h>
#include "greeterapp.h"
#include <config-kscreenlocker.h>
#include <kscreenlocker_greet_logging.h>
#if HAVE_SYS_PRCTL_H
#include <sys/prctl.h>
#endif
#if HAVE_SYS_PROCCTL_H
#include <sys/procctl.h>
#include <unistd.h>
#endif
#include <KSignalHandler>
#include <LayerShellQt/Shell>
static void signalHandler(int signum)
{
qCDebug(KSCREENLOCKER_GREET) << "Greeter received signal" << 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
qCDebug(KSCREENLOCKER_GREET) << "Greeter received SIGTERM. Will exit with error.";
instance->exit(1);
break;
case SIGUSR1:
qCDebug(KSCREENLOCKER_GREET) << "Greeter received SIGUSR1. Will lock immediately.";
instance->lockImmediately();
break;
}
}
int main(int argc, char *argv[])
{
sigset_t blockedSignals;
sigemptyset(&blockedSignals);
sigaddset(&blockedSignals, SIGTERM);
sigaddset(&blockedSignals, SIGUSR1);
pthread_sigmask(SIG_BLOCK, &blockedSignals, NULL);
LayerShellQt::Shell::useLayerShell();
// 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
qCDebug(KSCREENLOCKER_GREET) << "Greeter is starting up.";
KLocalizedString::setApplicationDomain(QByteArrayLiteral("kscreenlocker_greet"));
// explicitly disable input methods on x11 as it makes it impossible to unlock, see BUG 306932
// but explicitly set on screen keyboard such as maliit is allowed
// on wayland, let the compositor take care of the input method
if (!qEnvironmentVariableIsSet("WAYLAND_DISPLAY") && !qEnvironmentVariableIsSet("WAYLAND_SOCKET")
&& qgetenv("QT_IM_MODULE") != QByteArrayLiteral("maliit")) {
qputenv("QT_IM_MODULE", QByteArrayLiteral("qtvirtualkeyboard"));
}
// Suppresses modal warnings about unwritable configuration files which may render the system inaccessible
qputenv("KDE_HOME_READONLY", "1");
// Kwin will re-lock if it restarts, reconnecting would leave us with two greeters but only one functional
qunsetenv("QT_WAYLAND_RECONNECT");
// Disable QML caching to prevent cache corruption in full or near-full disk scenarios.
// https://bugs.kde.org/show_bug.cgi?id=471952
// https://bugreports.qt.io/browse/QTBUG-117130
qputenv("QML_DISABLE_DISK_CACHE", "1");
auto format = QSurfaceFormat::defaultFormat();
format.setOption(QSurfaceFormat::ResetNotification);
QSurfaceFormat::setDefaultFormat(format);
ScreenLocker::UnlockApp app(argc, argv);
KSignalHandler::self()->watchSignal(SIGTERM);
KSignalHandler::self()->watchSignal(SIGUSR1);
// only connect signal handler once we can actual handle the signal properly
QObject::connect(KSignalHandler::self(), &KSignalHandler::signalReceived, &app, &signalHandler);
pthread_sigmask(SIG_UNBLOCK, &blockedSignals, NULL);
app.setQuitOnLastWindowClosed(false);
app.setQuitLockEnabled(false);
QCoreApplication::setApplicationName(QStringLiteral("kscreenlocker_greet"));
QCoreApplication::setApplicationVersion(QStringLiteral("0.1"));
QCoreApplication::setOrganizationDomain(QStringLiteral("kde.org"));
// 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 shellOption(QStringLiteral("shell"),
i18n("Starts the greeter with the selected shell theme (only in Testing mode)"),
QStringLiteral("shell"),
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(shellOption);
parser.addOption(immediateLockOption);
parser.addOption(graceTimeOption);
parser.addOption(nolockOption);
parser.addOption(switchUserOption);
parser.addOption(waylandFdOption);
parser.process(app);
if (parser.isSet(testingOption)) {
qCDebug(KSCREENLOCKER_GREET) << "Greeter is running in testing mode";
app.setTesting(true);
app.setImmediateLock(true);
// parse shell option
const QString shell = parser.value(shellOption);
if (!shell.isEmpty()) {
app.setShell(shell);
}
// 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);
}
}
app.initialViewSetup();
// This allow ksmserver to know when the application 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().toSecsSinceEpoch() << std::endl;
return app.exec();
}
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