524 lines
20 KiB
C++
524 lines
20 KiB
C++
/**
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* Copyright 2013 Albert Vaca <albertvaka@gmail.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License or (at your option) version 3 or any later version
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* accepted by the membership of KDE e.V. (or its successor approved
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* by the membership of KDE e.V.), which shall act as a proxy
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* defined in Section 14 of version 3 of the license.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "lanlinkprovider.h"
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#include "core_debug.h"
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#ifndef Q_OS_WIN
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#include <netdb.h>
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#endif
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#include <QHostInfo>
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#include <QTcpServer>
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#include <QUdpSocket>
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#include <QtGlobal>
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#include <QNetworkSession>
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#include <QNetworkConfigurationManager>
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#include "../../daemon.h"
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#include "landevicelink.h"
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#include "lanpairinghandler.h"
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#include <kdeconnectconfig.h>
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#include <QDBusPendingReply>
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#include <QtNetwork/qsslcipher.h>
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#include <QtNetwork/qsslconfiguration.h>
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#define MIN_VERSION_WITH_SSL_SUPPORT 6
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LanLinkProvider::LanLinkProvider(bool testMode)
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: mTestMode(testMode)
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{
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mTcpPort = 0;
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combineBroadcastsTimer.setInterval(0); // increase this if waiting a single event-loop iteration is not enough
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combineBroadcastsTimer.setSingleShot(true);
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connect(&combineBroadcastsTimer, SIGNAL(timeout()), this, SLOT(broadcastToNetwork()));
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connect(&mUdpSocket, SIGNAL(readyRead()), this, SLOT(newUdpConnection()));
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mServer = new Server(this);
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connect(mServer,SIGNAL(newConnection()),this, SLOT(newConnection()));
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//Detect when a network interface changes status, so we announce ourelves in the new network
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QNetworkConfigurationManager* networkManager = new QNetworkConfigurationManager(this);
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connect(networkManager, &QNetworkConfigurationManager::configurationChanged, this, &LanLinkProvider::onNetworkConfigurationChanged);
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}
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void LanLinkProvider::onNetworkConfigurationChanged(const QNetworkConfiguration &config)
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{
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if (m_lastConfig != config && config.state() == QNetworkConfiguration::Active) {
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m_lastConfig = config;
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onNetworkChange();
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}
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}
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LanLinkProvider::~LanLinkProvider()
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{
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}
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void LanLinkProvider::onStart()
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{
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const QHostAddress bindAddress = mTestMode? QHostAddress::LocalHost : QHostAddress::Any;
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bool success = mUdpSocket.bind(bindAddress, port, QUdpSocket::ShareAddress);
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Q_ASSERT(success);
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qCDebug(KDECONNECT_CORE) << "onStart";
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mTcpPort = port;
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while (!mServer->listen(bindAddress, mTcpPort)) {
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mTcpPort++;
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if (mTcpPort > 1764) { //No ports available?
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qCritical(KDECONNECT_CORE) << "Error opening a port in range 1714-1764";
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mTcpPort = 0;
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return;
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}
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}
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onNetworkChange();
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}
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void LanLinkProvider::onStop()
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{
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qCDebug(KDECONNECT_CORE) << "onStop";
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mUdpSocket.close();
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mServer->close();
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}
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void LanLinkProvider::onNetworkChange()
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{
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if (combineBroadcastsTimer.isActive()) {
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qCDebug(KDECONNECT_CORE()) << "Preventing duplicate broadcasts";
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return;
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}
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combineBroadcastsTimer.start();
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}
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//I'm in a new network, let's be polite and introduce myself
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void LanLinkProvider::broadcastToNetwork()
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{
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if (!mServer->isListening()) {
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//Not started
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return;
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}
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Q_ASSERT(mTcpPort != 0);
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qCDebug(KDECONNECT_CORE()) << "Broadcasting identity packet";
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NetworkPackage np("");
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NetworkPackage::createIdentityPackage(&np);
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np.set("tcpPort", mTcpPort);
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mUdpSocket.writeDatagram(np.serialize(), mTestMode ? QHostAddress::LocalHost : QHostAddress("255.255.255.255"), port);
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}
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//I'm the existing device, a new device is kindly introducing itself.
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//I will create a TcpSocket and try to connect. This can result in either connected() or connectError().
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void LanLinkProvider::newUdpConnection() //udpBroadcastReceived
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{
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while (mUdpSocket.hasPendingDatagrams()) {
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QByteArray datagram;
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datagram.resize(mUdpSocket.pendingDatagramSize());
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QHostAddress sender;
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mUdpSocket.readDatagram(datagram.data(), datagram.size(), &sender);
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if (sender.isLoopback() && !mTestMode)
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continue;
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NetworkPackage* receivedPackage = new NetworkPackage("");
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bool success = NetworkPackage::unserialize(datagram, receivedPackage);
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//qCDebug(KDECONNECT_CORE) << "udp connection from " << receivedPackage->;
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//qCDebug(KDECONNECT_CORE) << "Datagram " << datagram.data() ;
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if (!success || receivedPackage->type() != PACKAGE_TYPE_IDENTITY) {
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delete receivedPackage;
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continue;
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}
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if (receivedPackage->get<QString>("deviceId") == KdeConnectConfig::instance()->deviceId()) {
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//qCDebug(KDECONNECT_CORE) << "Ignoring my own broadcast";
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delete receivedPackage;
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continue;
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}
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int tcpPort = receivedPackage->get<int>("tcpPort", port);
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//qCDebug(KDECONNECT_CORE) << "Received Udp identity package from" << sender << " asking for a tcp connection on port " << tcpPort;
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QSslSocket* socket = new QSslSocket(this);
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receivedIdentityPackages[socket].np = receivedPackage;
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receivedIdentityPackages[socket].sender = sender;
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connect(socket, SIGNAL(connected()), this, SLOT(connected()));
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connect(socket, SIGNAL(error(QAbstractSocket::SocketError)), this, SLOT(connectError()));
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socket->connectToHost(sender, tcpPort);
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}
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}
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void LanLinkProvider::connectError()
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{
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QSslSocket* socket = qobject_cast<QSslSocket*>(sender());
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if (!socket) return;
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disconnect(socket, SIGNAL(connected()), this, SLOT(connected()));
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disconnect(socket, SIGNAL(error(QAbstractSocket::SocketError)), this, SLOT(connectError()));
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qCDebug(KDECONNECT_CORE) << "Fallback (1), try reverse connection (send udp packet)" << socket->errorString();
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NetworkPackage np("");
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NetworkPackage::createIdentityPackage(&np);
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np.set("tcpPort", mTcpPort);
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mUdpSocket.writeDatagram(np.serialize(), receivedIdentityPackages[socket].sender, port);
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//The socket we created didn't work, and we didn't manage
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//to create a LanDeviceLink from it, deleting everything.
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delete receivedIdentityPackages.take(socket).np;
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delete socket;
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}
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//We received a UDP package and answered by connecting to them by TCP. This gets called on a succesful connection.
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void LanLinkProvider::connected()
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{
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qCDebug(KDECONNECT_CORE) << "Socket connected";
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QSslSocket* socket = qobject_cast<QSslSocket*>(sender());
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if (!socket) return;
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disconnect(socket, SIGNAL(connected()), this, SLOT(connected()));
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disconnect(socket, SIGNAL(error(QAbstractSocket::SocketError)), this, SLOT(connectError()));
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configureSocket(socket);
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// If socket disconnects due to any reason after connection, link on ssl faliure
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connect(socket, SIGNAL(disconnected()), socket, SLOT(deleteLater()));
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NetworkPackage* receivedPackage = receivedIdentityPackages[socket].np;
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const QString& deviceId = receivedPackage->get<QString>("deviceId");
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//qCDebug(KDECONNECT_CORE) << "Connected" << socket->isWritable();
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// If network is on ssl, do not believe when they are connected, believe when handshake is completed
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NetworkPackage np2("");
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NetworkPackage::createIdentityPackage(&np2);
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socket->write(np2.serialize());
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bool success = socket->waitForBytesWritten();
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if (success) {
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qCDebug(KDECONNECT_CORE) << "TCP connection done (i'm the existing device)";
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// if ssl supported
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if (receivedPackage->get<int>("protocolVersion") >= MIN_VERSION_WITH_SSL_SUPPORT) {
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// since I support ssl and remote device support ssl
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socket->setPeerVerifyName(deviceId);
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QString certString = KdeConnectConfig::instance()->getDeviceProperty(deviceId, "certificate", QString());
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if (!certString.isEmpty()) {
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qCDebug(KDECONNECT_CORE) << "Device trusted";
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socket->addCaCertificate(QSslCertificate(certString.toLatin1()));
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socket->setPeerVerifyMode(QSslSocket::VerifyPeer);
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connect(socket, SIGNAL(sslErrors(QList<QSslError>)), this, SLOT(sslErrors(QList<QSslError>)));
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} else {
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qCDebug(KDECONNECT_CORE) << "Device untrusted";
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// Do not care about ssl errors here, socket will not be closed due to errors because of query peer
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socket->setPeerVerifyMode(QSslSocket::QueryPeer);
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connect(socket, SIGNAL(sslErrors(QList<QSslError>)), this, SLOT(sslErrorsLogButIgnore(QList<QSslError>)));
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}
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qCDebug(KDECONNECT_CORE) << "Starting server ssl (I'm the client TCP socket)";
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connect(socket, SIGNAL(encrypted()), this, SLOT(encrypted()));
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socket->startServerEncryption();
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return; // Return statement prevents from deleting received package, needed in slot "encrypted"
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} else {
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qWarning() << receivedPackage->get<QString>("deviceName") << "uses an old protocol version, this won't work";
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//addLink(deviceId, socket, receivedPackage, LanDeviceLink::Remotely);
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}
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} else {
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//I think this will never happen, but if it happens the deviceLink
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//(or the socket that is now inside it) might not be valid. Delete them.
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qCDebug(KDECONNECT_CORE) << "Fallback (2), try reverse connection (send udp packet)";
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mUdpSocket.writeDatagram(np2.serialize(), receivedIdentityPackages[socket].sender, port);
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}
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delete receivedIdentityPackages.take(socket).np;
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//We don't delete the socket because now it's owned by the LanDeviceLink
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}
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void LanLinkProvider::encrypted()
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{
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qCDebug(KDECONNECT_CORE) << "Socket succesfully stablished an SSL connection";
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QSslSocket* socket = qobject_cast<QSslSocket*>(sender());
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if (!socket) return;
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disconnect(socket, SIGNAL(encrypted()), this, SLOT(encrypted()));
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disconnect(socket, SIGNAL(sslErrors(QList<QSslError>)), this, SLOT(sslErrors(QList<QSslError>)));
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NetworkPackage* receivedPackage = receivedIdentityPackages[socket].np;
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const QString& deviceId = receivedPackage->get<QString>("deviceId");
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addLink(deviceId, socket, receivedPackage, LanDeviceLink::Remotely);
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// Copied from connected slot, now delete received package
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delete receivedIdentityPackages.take(socket).np;
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}
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void LanLinkProvider::sslErrors(const QList<QSslError>& errors)
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{
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QSslSocket* socket = qobject_cast<QSslSocket*>(sender());
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if (!socket) return;
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disconnect(socket, SIGNAL(encrypted()), this, SLOT(encrypted()));
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disconnect(socket, SIGNAL(sslErrors(QList<QSslError>)), this, SLOT(sslErrors(QList<QSslError>)));
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Q_FOREACH (const QSslError &error, errors) {
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qCDebug(KDECONNECT_CORE) << "SSL Error :" << error.errorString();
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switch (error.error()) {
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case QSslError::CertificateSignatureFailed:
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case QSslError::CertificateNotYetValid:
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case QSslError::CertificateExpired:
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case QSslError::CertificateUntrusted:
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case QSslError::SelfSignedCertificate: {
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qCDebug(KDECONNECT_CORE) << "Unpairing device due to " << error.errorString();
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// Due to simultaneous multiple connections, it may be possible that device instance does not exist anymore
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Device *device = Daemon::instance()->getDevice(socket->peerVerifyName());
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if (device != Q_NULLPTR) {
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device->unpair();
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}
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break;
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}
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default:
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continue;
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// Lots of warnings without this
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}
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}
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delete receivedIdentityPackages.take(socket).np;
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// Socket disconnects itself on ssl error and will be deleted by deleteLater slot, no need to delete manually
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}
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void LanLinkProvider::sslErrorsLogButIgnore(const QList<QSslError>& errors)
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{
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Q_FOREACH (const QSslError &error, errors) {
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qCDebug(KDECONNECT_CORE) << "SSL Error (ignoring):" << error.errorString();
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}
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}
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//I'm the new device and this is the answer to my UDP identity package (no data received yet). They are connecting to us through TCP, and they should send an identity.
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void LanLinkProvider::newConnection()
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{
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//qCDebug(KDECONNECT_CORE) << "LanLinkProvider newConnection";
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while (mServer->hasPendingConnections()) {
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QSslSocket* socket = mServer->nextPendingConnection();
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configureSocket(socket);
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//This socket is still managed by us (and child of the QTcpServer), if
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//it disconnects before we manage to pass it to a LanDeviceLink, it's
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//our responsibility to delete it. We do so with this connection.
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connect(socket, SIGNAL(disconnected()),
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socket, SLOT(deleteLater()));
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connect(socket, SIGNAL(readyRead()),
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this, SLOT(dataReceived()));
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}
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}
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//I'm the new device and this is the answer to my UDP identity package (data received)
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void LanLinkProvider::dataReceived()
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{
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QSslSocket* socket = qobject_cast<QSslSocket*>(sender());
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const QByteArray data = socket->readLine();
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//qCDebug(KDECONNECT_CORE) << "LanLinkProvider received reply:" << data;
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NetworkPackage* np = new NetworkPackage("");
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bool success = NetworkPackage::unserialize(data, np);
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if (!success) {
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delete np;
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return;
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}
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if (np->type() != PACKAGE_TYPE_IDENTITY) {
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qCWarning(KDECONNECT_CORE) << "LanLinkProvider/newConnection: Expected identity, received " << np->type();
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delete np;
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return;
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}
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// Needed in "encrypted" if ssl is used, similar to "connected"
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receivedIdentityPackages[socket].np = np;
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const QString& deviceId = np->get<QString>("deviceId");
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//qCDebug(KDECONNECT_CORE) << "Handshaking done (i'm the new device)";
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//This socket will now be owned by the LanDeviceLink or we don't want more data to be received, forget about it
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disconnect(socket, SIGNAL(readyRead()), this, SLOT(dataReceived()));
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if (np->get<int>("protocolVersion") >= MIN_VERSION_WITH_SSL_SUPPORT) {
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// since I support ssl and remote device support ssl
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bool isDeviceTrusted = KdeConnectConfig::instance()->trustedDevices().contains(deviceId);
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socket->setPeerVerifyName(deviceId);
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if (isDeviceTrusted) {
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qCDebug(KDECONNECT_CORE) << "Device trusted";
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QString certString = KdeConnectConfig::instance()->getDeviceProperty(deviceId, "certificate", QString());
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socket->addCaCertificate(QSslCertificate(certString.toLatin1()));
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socket->setPeerVerifyMode(QSslSocket::VerifyPeer);
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connect(socket, SIGNAL(sslErrors(QList<QSslError>)), this, SLOT(sslErrors(QList<QSslError>)));
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} else {
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qCDebug(KDECONNECT_CORE) << "Device untrusted";
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// Do not care about ssl errors here, socket will not be closed due to errors because of query peer
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socket->setPeerVerifyMode(QSslSocket::QueryPeer);
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connect(socket, SIGNAL(sslErrors(QList<QSslError>)), this, SLOT(sslErrorsLogButIgnore(QList<QSslError>)));
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}
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qCDebug(KDECONNECT_CORE) << "Starting client ssl (but I'm the server TCP socket)";
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connect(socket, SIGNAL(encrypted()), this, SLOT(encrypted()));
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socket->startClientEncryption();
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} else {
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qWarning() << np->get<QString>("deviceName") << "uses an old protocol version, this won't work";
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//addLink(deviceId, socket, np, LanDeviceLink::Locally);
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delete receivedIdentityPackages.take(socket).np;
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}
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}
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void LanLinkProvider::deviceLinkDestroyed(QObject* destroyedDeviceLink)
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{
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const QString id = destroyedDeviceLink->property("deviceId").toString();
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//qCDebug(KDECONNECT_CORE) << "deviceLinkDestroyed" << id;
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Q_ASSERT(mLinks.key(static_cast<LanDeviceLink*>(destroyedDeviceLink)) == id);
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QMap< QString, LanDeviceLink* >::iterator linkIterator = mLinks.find(id);
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if (linkIterator != mLinks.end()) {
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Q_ASSERT(linkIterator.value() == destroyedDeviceLink);
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mLinks.erase(linkIterator);
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mPairingHandlers.remove(id);
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}
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}
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void LanLinkProvider::configureSocket(QSslSocket* socket)
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{
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// Setting supported ciphers manually
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// Top 3 ciphers are for new Android devices, botton two are for old Android devices
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// FIXME : These cipher suites should be checked whether they are supported or not on device
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QList<QSslCipher> socketCiphers;
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socketCiphers.append(QSslCipher("ECDHE-ECDSA-AES256-GCM-SHA384"));
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socketCiphers.append(QSslCipher("ECDHE-ECDSA-AES128-GCM-SHA256"));
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socketCiphers.append(QSslCipher("ECDHE-RSA-AES128-SHA"));
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socketCiphers.append(QSslCipher("RC4-SHA"));
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socketCiphers.append(QSslCipher("RC4-MD5"));
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// Configure for ssl
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QSslConfiguration sslConfig;
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sslConfig.setCiphers(socketCiphers);
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sslConfig.setProtocol(QSsl::TlsV1_0);
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socket->setSslConfiguration(sslConfig);
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socket->setLocalCertificate(KdeConnectConfig::instance()->certificate());
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socket->setPrivateKey(KdeConnectConfig::instance()->privateKeyPath());
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socket->setSocketOption(QAbstractSocket::KeepAliveOption, QVariant(1));
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#ifdef TCP_KEEPIDLE
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// time to start sending keepalive packets (seconds)
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int maxIdle = 10;
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setsockopt(socket->socketDescriptor(), IPPROTO_TCP, TCP_KEEPIDLE, &maxIdle, sizeof(maxIdle));
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#endif
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#ifdef TCP_KEEPINTVL
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// interval between keepalive packets after the initial period (seconds)
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int interval = 5;
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setsockopt(socket->socketDescriptor(), IPPROTO_TCP, TCP_KEEPINTVL, &interval, sizeof(interval));
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#endif
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#ifdef TCP_KEEPCNT
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// number of missed keepalive packets before disconnecting
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int count = 3;
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setsockopt(socket->socketDescriptor(), IPPROTO_TCP, TCP_KEEPCNT, &count, sizeof(count));
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#endif
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}
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void LanLinkProvider::addLink(const QString& deviceId, QSslSocket* socket, NetworkPackage* receivedPackage, LanDeviceLink::ConnectionStarted connectionOrigin)
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{
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// Socket disconnection will now be handled by LanDeviceLink
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disconnect(socket, SIGNAL(disconnected()), socket, SLOT(deleteLater()));
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LanDeviceLink* deviceLink;
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//Do we have a link for this device already?
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QMap< QString, LanDeviceLink* >::iterator linkIterator = mLinks.find(deviceId);
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if (linkIterator != mLinks.end()) {
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//qCDebug(KDECONNECT_CORE) << "Reusing link to" << deviceId;
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deviceLink = linkIterator.value();
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deviceLink->reset(socket, connectionOrigin);
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} else {
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deviceLink = new LanDeviceLink(deviceId, this, socket, connectionOrigin);
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connect(deviceLink, SIGNAL(destroyed(QObject*)), this, SLOT(deviceLinkDestroyed(QObject*)));
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mLinks[deviceId] = deviceLink;
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if (mPairingHandlers.contains(deviceId)) {
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//We shouldn't have a pairinghandler if we didn't have a link.
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//Crash if debug, recover if release (by setting the new devicelink to the old pairinghandler)
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Q_ASSERT(mPairingHandlers.contains(deviceId));
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mPairingHandlers[deviceId]->setDeviceLink(deviceLink);
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}
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Q_EMIT onConnectionReceived(*receivedPackage, deviceLink);
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}
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}
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LanPairingHandler* LanLinkProvider::createPairingHandler(DeviceLink* link)
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|
{
|
|
LanPairingHandler* ph = mPairingHandlers.value(link->deviceId());
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if (!ph) {
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|
ph = new LanPairingHandler(link);
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qCDebug(KDECONNECT_CORE) << "creating pairing handler for" << link->deviceId();
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connect (ph, &LanPairingHandler::pairingError, link, &DeviceLink::pairingError);
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mPairingHandlers[link->deviceId()] = ph;
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}
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return ph;
|
|
}
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|
|
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void LanLinkProvider::userRequestsPair(const QString& deviceId)
|
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{
|
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LanPairingHandler* ph = createPairingHandler(mLinks.value(deviceId));
|
|
ph->requestPairing();
|
|
}
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|
|
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void LanLinkProvider::userRequestsUnpair(const QString& deviceId)
|
|
{
|
|
LanPairingHandler* ph = createPairingHandler(mLinks.value(deviceId));
|
|
ph->unpair();
|
|
}
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|
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void LanLinkProvider::incomingPairPackage(DeviceLink* deviceLink, const NetworkPackage& np)
|
|
{
|
|
LanPairingHandler* ph = createPairingHandler(deviceLink);
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|
ph->packageReceived(np);
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}
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