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Display.cpp
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Display.cpp
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/***************************************************************************
* Copyright (c) 2014-2015 Pier Luigi Fiorini <pierluigi.fiorini@gmail.com>
* Copyright (c) 2014 Martin Bříza <mbriza@redhat.com>
* Copyright (c) 2013 Abdurrahman AVCI <abdurrahmanavci@gmail.com>
*
* 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, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
***************************************************************************/
#include "Display.h"
#include "Configuration.h"
#include "DaemonApp.h"
#include "DisplayManager.h"
#include "WaylandDisplayServer.h"
#include "XorgDisplayServer.h"
#include "Seat.h"
#include "SocketServer.h"
#include "Greeter.h"
#include "Utils.h"
#include "SignalHandler.h"
#include <QDebug>
#include <QFile>
#include <QTimer>
#include <QLocalSocket>
#include <pwd.h>
#include <unistd.h>
#include <QDBusConnection>
#include <QDBusMessage>
#include <QDBusReply>
#include "Login1Manager.h"
#include "Login1Session.h"
#include "VirtualTerminal.h"
namespace SDDM {
Display::Display(const int terminalId, Seat *parent) : QObject(parent),
m_terminalId(terminalId),
m_auth(new Auth(this)),
m_seat(parent),
m_socketServer(new SocketServer(this)),
m_greeter(new Greeter(this)) {
// create the display server based on the configuration, but
// always fallback to X11
const QString &displayServerType = mainConfig.DisplayServer.get().toLower();
if (displayServerType == QLatin1String("wayland"))
m_displayServer = new WaylandDisplayServer(this);
else {
m_xorgDisplayServer = new XorgDisplayServer(this);
m_displayServer = m_xorgDisplayServer;
}
// respond to authentication requests
m_auth->setVerbose(true);
connect(m_auth, &Auth::requestChanged, this, &Display::slotRequestChanged);
connect(m_auth, &Auth::authentication, this, &Display::slotAuthenticationFinished);
connect(m_auth, &Auth::sessionStarted, this, &Display::slotSessionStarted);
connect(m_auth, &Auth::finished, this, &Display::slotHelperFinished);
connect(m_auth, &Auth::info, this, &Display::slotAuthInfo);
connect(m_auth, &Auth::error, this, &Display::slotAuthError);
// restart display after display server ended
connect(m_displayServer, &DisplayServer::started, this, &Display::displayServerStarted);
connect(m_displayServer, &DisplayServer::stopped, this, &Display::stop);
// connect login signal
connect(m_socketServer, &SocketServer::login, this, &Display::login);
// connect login result signals
connect(this, SIGNAL(loginFailed(QLocalSocket*)), m_socketServer, SLOT(loginFailed(QLocalSocket*)));
connect(this, SIGNAL(loginSucceeded(QLocalSocket*)), m_socketServer, SLOT(loginSucceeded(QLocalSocket*)));
}
Display::~Display() {
stop();
}
QString Display::displayId() const {
return m_displayServer->display();
}
const int Display::terminalId() const {
return m_terminalId;
}
const QString &Display::name() const {
return m_displayServer->display();
}
QString Display::sessionType() const {
return m_displayServer->sessionType();
}
Seat *Display::seat() const {
return m_seat;
}
bool Display::start() {
return m_started || m_displayServer->start();
}
bool Display::attemptAutologin() {
Session::Type sessionType = Session::X11Session;
// determine session type
QString autologinSession = mainConfig.Autologin.Session.get();
// not configured: try last successful logged in
if (autologinSession.isEmpty()) {
autologinSession = stateConfig.Last.Session.get();
}
if (findSessionEntry(mainConfig.Wayland.SessionDir.get(), autologinSession)) {
sessionType = Session::WaylandSession;
} else if (findSessionEntry(mainConfig.X11.SessionDir.get(), autologinSession)) {
sessionType = Session::X11Session;
} else {
qCritical() << "Unable to find autologin session entry" << autologinSession;
return false;
}
Session session;
session.setTo(sessionType, autologinSession);
m_auth->setAutologin(true);
startAuth(mainConfig.Autologin.User.get(), QString(), session);
return true;
}
void Display::displayServerStarted() {
// check flag
if (m_started)
return;
// log message
qDebug() << "Display server started.";
if ((daemonApp->first || mainConfig.Autologin.Relogin.get()) &&
!mainConfig.Autologin.User.get().isEmpty()) {
// reset first flag
daemonApp->first = false;
// set flags
m_started = true;
bool success = attemptAutologin();
if (success) {
return;
}
}
// start socket server
m_socketServer->start(m_displayServer->display());
if (!daemonApp->testing()) {
// change the owner and group of the socket to avoid permission denied errors
struct passwd *pw = getpwnam("sddm");
if (pw) {
if (chown(qPrintable(m_socketServer->socketAddress()), pw->pw_uid, pw->pw_gid) == -1) {
qWarning() << "Failed to change owner of the socket";
return;
}
}
}
// set greeter params
m_greeter->setDisplay(this);
if (m_displayServer->sessionType() == QLatin1String("x11"))
m_greeter->setAuthPath(xorgServer()->authPath());
m_greeter->setSocket(m_socketServer->socketAddress());
m_greeter->setTheme(findGreeterTheme());
m_greeter->setCompositor(mainConfig.Wayland.CompositorCommand.get());
// start greeter
m_greeter->start();
// reset first flag
daemonApp->first = false;
// set flags
m_started = true;
}
void Display::stop() {
// check flag
if (!m_started)
return;
// stop the greeter
m_greeter->stop();
// stop socket server
m_socketServer->stop();
// stop display server
m_displayServer->blockSignals(true);
m_displayServer->stop();
m_displayServer->blockSignals(false);
// reset flag
m_started = false;
// emit signal
emit stopped();
}
void Display::login(QLocalSocket *socket,
const QString &user, const QString &password,
const Session &session) {
m_socket = socket;
//the SDDM user has special privileges that skip password checking so that we can load the greeter
//block ever trying to log in as the SDDM user
if (user == QLatin1String("sddm")) {
return;
}
// authenticate
startAuth(user, password, session);
}
QString Display::findGreeterTheme() const {
QString themeName = mainConfig.Theme.Current.get();
// an unconfigured theme means the user wants to load the
// default theme from the resources
if (themeName.isEmpty())
return QString();
QDir dir(mainConfig.Theme.ThemeDir.get());
// return the default theme if it exists
if (dir.exists(themeName))
return dir.absoluteFilePath(themeName);
// otherwise use the embedded theme
qWarning() << "The configured theme" << themeName << "doesn't exist, using the embedded theme instead";
return QString();
}
bool Display::findSessionEntry(const QDir &dir, const QString &name) const {
QString fileName = name;
// append extension
const QString extension = QStringLiteral(".desktop");
if (!fileName.endsWith(extension))
fileName += extension;
return dir.exists(fileName);
}
void Display::startAuth(const QString &user, const QString &password, const Session &session) {
if (m_auth->isActive()) {
qWarning() << "Existing authentication ongoing, aborting";
return;
}
m_passPhrase = password;
// sanity check
if (!session.isValid()) {
qCritical() << "Invalid session" << session.fileName();
return;
}
if (session.xdgSessionType().isEmpty()) {
qCritical() << "Failed to find XDG session type for session" << session.fileName();
return;
}
if (session.exec().isEmpty()) {
qCritical() << "Failed to find command for session" << session.fileName();
return;
}
m_reuseSessionId = QString();
if (Logind::isAvailable() && mainConfig.Users.ReuseSession.get()) {
OrgFreedesktopLogin1ManagerInterface manager(Logind::serviceName(), Logind::managerPath(), QDBusConnection::systemBus());
auto reply = manager.ListSessions();
reply.waitForFinished();
for(const SessionInfo &s : reply.value()) {
if (s.userName == user) {
OrgFreedesktopLogin1SessionInterface session(Logind::serviceName(), s.sessionPath.path(), QDBusConnection::systemBus());
if (session.service() == QLatin1String("sddm") && session.state() == QLatin1String("online")) {
m_reuseSessionId = s.sessionId;
break;
}
}
}
}
// cache last session
m_lastSession = session;
// save session desktop file name, we'll use it to set the
// last session later, in slotAuthenticationFinished()
m_sessionName = session.fileName();
// some information
qDebug() << "Session" << m_sessionName << "selected, command:" << session.exec();
QProcessEnvironment env;
if (seat()->name() == QLatin1String("seat0")) {
// Use the greeter VT, for wayland sessions the helper overwrites this
env.insert(QStringLiteral("XDG_VTNR"), QString::number(terminalId()));
}
// create new VT for Wayland sessions otherwise use greeter vt
int vt = terminalId();
if (session.xdgSessionType() == QLatin1String("wayland"))
vt = VirtualTerminal::setUpNewVt();
m_lastSession.setVt(vt);
env.insert(QStringLiteral("PATH"), mainConfig.Users.DefaultPath.get());
if (session.xdgSessionType() == QLatin1String("x11"))
env.insert(QStringLiteral("DISPLAY"), name());
env.insert(QStringLiteral("XDG_SEAT_PATH"), daemonApp->displayManager()->seatPath(seat()->name()));
env.insert(QStringLiteral("XDG_SESSION_PATH"), daemonApp->displayManager()->sessionPath(QStringLiteral("Session%1").arg(daemonApp->newSessionId())));
env.insert(QStringLiteral("DESKTOP_SESSION"), session.desktopSession());
env.insert(QStringLiteral("XDG_CURRENT_DESKTOP"), session.desktopNames());
env.insert(QStringLiteral("XDG_SESSION_CLASS"), QStringLiteral("user"));
env.insert(QStringLiteral("XDG_SESSION_TYPE"), session.xdgSessionType());
env.insert(QStringLiteral("XDG_SEAT"), seat()->name());
env.insert(QStringLiteral("XDG_SESSION_DESKTOP"), session.desktopNames());
m_auth->insertEnvironment(env);
m_auth->setUser(user);
if (m_reuseSessionId.isNull()) {
m_auth->setSession(session.exec());
}
m_auth->start();
}
void Display::slotAuthenticationFinished(const QString &user, bool success) {
if (success) {
qDebug() << "Authenticated successfully";
if (!m_reuseSessionId.isNull()) {
OrgFreedesktopLogin1ManagerInterface manager(Logind::serviceName(), Logind::managerPath(), QDBusConnection::systemBus());
manager.UnlockSession(m_reuseSessionId);
manager.ActivateSession(m_reuseSessionId);
} else if (m_lastSession.xdgSessionType() == QLatin1String("x11")) {
m_auth->setCookie(xorgServer()->cookie());
}
// save last user and last session
if (mainConfig.Users.RememberLastUser.get())
stateConfig.Last.User.set(m_auth->user());
else
stateConfig.Last.User.setDefault();
if (mainConfig.Users.RememberLastSession.get())
stateConfig.Last.Session.set(m_sessionName);
else
stateConfig.Last.Session.setDefault();
stateConfig.save();
if (m_socket) {
// switch to the new VT for Wayland sessions
if (m_lastSession.xdgSessionType() == QLatin1String("wayland"))
VirtualTerminal::jumpToVt(m_lastSession.vt(), true);
emit loginSucceeded(m_socket);
}
} else if (m_socket) {
qDebug() << "Authentication failure";
emit loginFailed(m_socket);
}
m_socket = nullptr;
}
void Display::slotAuthInfo(const QString &message, Auth::Info info) {
// TODO: presentable to the user, eventually
Q_UNUSED(info);
qWarning() << "Authentication information:" << message;
}
void Display::slotAuthError(const QString &message, Auth::Error error) {
// TODO: handle more errors
qWarning() << "Authentication error:" << message;
if (!m_socket)
return;
if (error == Auth::ERROR_AUTHENTICATION)
emit loginFailed(m_socket);
}
void Display::slotHelperFinished(Auth::HelperExitStatus status) {
// Don't restart greeter and display server unless sddm-helper exited
// with an internal error or the user session finished successfully,
// we want to avoid greeter from restarting when an authentication
// error happens (in this case we want to show the message from the
// greeter
if (status != Auth::HELPER_AUTH_ERROR)
stop();
}
void Display::slotRequestChanged() {
if (m_auth->request()->prompts().length() == 1) {
m_auth->request()->prompts()[0]->setResponse(qPrintable(m_passPhrase));
m_auth->request()->done();
} else if (m_auth->request()->prompts().length() == 2) {
m_auth->request()->prompts()[0]->setResponse(qPrintable(m_auth->user()));
m_auth->request()->prompts()[1]->setResponse(qPrintable(m_passPhrase));
m_auth->request()->done();
}
}
void Display::slotSessionStarted(bool success) {
qDebug() << "Session started";
}
XorgDisplayServer* Display::xorgServer()
{
if (!m_xorgDisplayServer) {
m_xorgDisplayServer = new XorgDisplayServer(this);
m_xorgDisplayServer->start();
connect(m_xorgDisplayServer, &DisplayServer::started, m_xorgDisplayServer, &DisplayServer::setupDisplay);
connect(this, &Display::stopped, m_xorgDisplayServer, &XorgDisplayServer::stop);
}
return m_xorgDisplayServer;
}
}