558 lines
22 KiB
C++
558 lines
22 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 <https://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 <QMetaEnum>
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#include <QNetworkProxy>
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#include <QUdpSocket>
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#include <QNetworkSession>
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#include <QNetworkConfigurationManager>
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#include <QSslCipher>
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#include <QSslConfiguration>
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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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#define MIN_VERSION_WITH_SSL_SUPPORT 6
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LanLinkProvider::LanLinkProvider(
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bool testMode,
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quint16 udpBroadcastPort,
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quint16 udpListenPort
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)
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: m_server(new Server(this))
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, m_udpSocket(this)
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, m_tcpPort(0)
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, m_udpBroadcastPort(udpBroadcastPort)
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, m_udpListenPort(udpListenPort)
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, m_testMode(testMode)
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, m_combineBroadcastsTimer(this)
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{
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m_combineBroadcastsTimer.setInterval(0); // increase this if waiting a single event-loop iteration is not enough
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m_combineBroadcastsTimer.setSingleShot(true);
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connect(&m_combineBroadcastsTimer, &QTimer::timeout, this, &LanLinkProvider::broadcastToNetwork);
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connect(&m_udpSocket, &QIODevice::readyRead, this, &LanLinkProvider::udpBroadcastReceived);
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m_server->setProxy(QNetworkProxy::NoProxy);
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connect(m_server, &QTcpServer::newConnection, this, &LanLinkProvider::newConnection);
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m_udpSocket.setProxy(QNetworkProxy::NoProxy);
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//Detect when a network interface changes status, so we announce ourselves 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 = m_testMode? QHostAddress::LocalHost : QHostAddress::Any;
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bool success = m_udpSocket.bind(bindAddress, m_udpListenPort, QUdpSocket::ShareAddress);
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if (!success) {
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QAbstractSocket::SocketError sockErr = m_udpSocket.error();
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// Refer to https://doc.qt.io/qt-5/qabstractsocket.html#SocketError-enum to decode socket error number
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QString errorMessage = QString::fromLatin1(QMetaEnum::fromType<QAbstractSocket::SocketError>().valueToKey(sockErr));
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qCritical(KDECONNECT_CORE)
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<< QLatin1String("Failed to bind UDP socket on port")
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<< m_udpListenPort
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<< QLatin1String("with error")
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<< errorMessage;
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}
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Q_ASSERT(success);
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m_tcpPort = MIN_TCP_PORT;
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while (!m_server->listen(bindAddress, m_tcpPort)) {
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m_tcpPort++;
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if (m_tcpPort > MAX_TCP_PORT) { //No ports available?
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qCritical(KDECONNECT_CORE) << "Error opening a port in range" << MIN_TCP_PORT << "-" << MAX_TCP_PORT;
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m_tcpPort = 0;
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return;
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}
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}
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onNetworkChange();
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qCDebug(KDECONNECT_CORE) << "LanLinkProvider started";
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}
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void LanLinkProvider::onStop()
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{
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m_udpSocket.close();
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m_server->close();
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qCDebug(KDECONNECT_CORE) << "LanLinkProvider stopped";
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}
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void LanLinkProvider::onNetworkChange()
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{
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if (m_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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m_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 (!m_server->isListening()) {
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//Not started
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return;
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}
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Q_ASSERT(m_tcpPort != 0);
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qCDebug(KDECONNECT_CORE()) << "Broadcasting identity packet";
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QHostAddress destAddress = m_testMode? QHostAddress::LocalHost : QHostAddress(QStringLiteral("255.255.255.255"));
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NetworkPacket np(QLatin1String(""));
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NetworkPacket::createIdentityPacket(&np);
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np.set(QStringLiteral("tcpPort"), m_tcpPort);
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#ifdef Q_OS_WIN
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//On Windows we need to broadcast from every local IP address to reach all networks
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QUdpSocket sendSocket;
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sendSocket.setProxy(QNetworkProxy::NoProxy);
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for (const QNetworkInterface& iface : QNetworkInterface::allInterfaces()) {
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if ( (iface.flags() & QNetworkInterface::IsUp)
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&& (iface.flags() & QNetworkInterface::IsRunning)
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&& (iface.flags() & QNetworkInterface::CanBroadcast)) {
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for (const QNetworkAddressEntry& ifaceAddress : iface.addressEntries()) {
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QHostAddress sourceAddress = ifaceAddress.ip();
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if (sourceAddress.protocol() == QAbstractSocket::IPv4Protocol && sourceAddress != QHostAddress::LocalHost) {
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qCDebug(KDECONNECT_CORE()) << "Broadcasting as" << sourceAddress;
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sendSocket.writeDatagram(np.serialize(), destAddress, m_udpBroadcastPort);
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sendSocket.close();
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}
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}
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}
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}
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#else
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m_udpSocket.writeDatagram(np.serialize(), destAddress, m_udpBroadcastPort);
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#endif
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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 tcpSocketConnected() or connectError().
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void LanLinkProvider::udpBroadcastReceived()
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{
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while (m_udpSocket.hasPendingDatagrams()) {
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QByteArray datagram;
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datagram.resize(m_udpSocket.pendingDatagramSize());
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QHostAddress sender;
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m_udpSocket.readDatagram(datagram.data(), datagram.size(), &sender);
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if (sender.isLoopback() && !m_testMode)
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continue;
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NetworkPacket* receivedPacket = new NetworkPacket(QLatin1String(""));
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bool success = NetworkPacket::unserialize(datagram, receivedPacket);
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//qCDebug(KDECONNECT_CORE) << "udp connection from " << receivedPacket->;
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//qCDebug(KDECONNECT_CORE) << "Datagram " << datagram.data() ;
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if (!success) {
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qCDebug(KDECONNECT_CORE) << "Could not unserialize UDP packet";
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delete receivedPacket;
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continue;
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}
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if (receivedPacket->type() != PACKET_TYPE_IDENTITY) {
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qCDebug(KDECONNECT_CORE) << "Received a UDP packet of wrong type" << receivedPacket->type();
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delete receivedPacket;
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continue;
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}
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if (receivedPacket->get<QString>(QStringLiteral("deviceId")) == KdeConnectConfig::instance().deviceId()) {
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//qCDebug(KDECONNECT_CORE) << "Ignoring my own broadcast";
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delete receivedPacket;
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continue;
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}
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int tcpPort = receivedPacket->get<int>(QStringLiteral("tcpPort"));
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//qCDebug(KDECONNECT_CORE) << "Received Udp identity packet from" << sender << " asking for a tcp connection on port " << tcpPort;
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QSslSocket* socket = new QSslSocket(this);
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socket->setProxy(QNetworkProxy::NoProxy);
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m_receivedIdentityPackets[socket].np = receivedPacket;
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m_receivedIdentityPackets[socket].sender = sender;
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connect(socket, &QAbstractSocket::connected, this, &LanLinkProvider::tcpSocketConnected);
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connect(socket, QOverload<QAbstractSocket::SocketError>::of(&QAbstractSocket::error), this, &LanLinkProvider::connectError);
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socket->connectToHost(sender, tcpPort);
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}
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}
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void LanLinkProvider::connectError(QAbstractSocket::SocketError socketError)
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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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qCDebug(KDECONNECT_CORE) << "Socket error" << socketError;
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qCDebug(KDECONNECT_CORE) << "Fallback (1), try reverse connection (send udp packet)" << socket->errorString();
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NetworkPacket np(QLatin1String(""));
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NetworkPacket::createIdentityPacket(&np);
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np.set(QStringLiteral("tcpPort"), m_tcpPort);
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m_udpSocket.writeDatagram(np.serialize(), m_receivedIdentityPackets[socket].sender, m_udpBroadcastPort);
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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 m_receivedIdentityPackets.take(socket).np;
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delete socket;
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}
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//We received a UDP packet and answered by connecting to them by TCP. This gets called on a successful connection.
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void LanLinkProvider::tcpSocketConnected()
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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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// TODO Delete me?
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disconnect(socket, QOverload<QAbstractSocket::SocketError>::of(&QAbstractSocket::error), this, &LanLinkProvider::connectError);
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configureSocket(socket);
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// If socket disconnects due to any reason after connection, link on ssl failure
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connect(socket, &QAbstractSocket::disconnected, socket, &QObject::deleteLater);
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NetworkPacket* receivedPacket = m_receivedIdentityPackets[socket].np;
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const QString& deviceId = receivedPacket->get<QString>(QStringLiteral("deviceId"));
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//qCDebug(KDECONNECT_CORE) << "tcpSocketConnected" << 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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NetworkPacket np2(QLatin1String(""));
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NetworkPacket::createIdentityPacket(&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 (receivedPacket->get<int>(QStringLiteral("protocolVersion")) >= MIN_VERSION_WITH_SSL_SUPPORT) {
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bool isDeviceTrusted = KdeConnectConfig::instance().trustedDevices().contains(deviceId);
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configureSslSocket(socket, deviceId, isDeviceTrusted);
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qCDebug(KDECONNECT_CORE) << "Starting server ssl (I'm the client TCP socket)";
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connect(socket, &QSslSocket::encrypted, this, &LanLinkProvider::encrypted);
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if (isDeviceTrusted) {
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connect(socket, QOverload<const QList<QSslError> &>::of(&QSslSocket::sslErrors), this, &LanLinkProvider::sslErrors);
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}
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socket->startServerEncryption();
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return; // Return statement prevents from deleting received packet, needed in slot "encrypted"
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} else {
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qWarning() << receivedPacket->get<QString>(QStringLiteral("deviceName")) << "uses an old protocol version, this won't work";
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//addLink(deviceId, socket, receivedPacket, 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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m_udpSocket.writeDatagram(np2.serialize(), m_receivedIdentityPackets[socket].sender, m_udpBroadcastPort);
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}
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delete m_receivedIdentityPackets.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 successfully established an SSL connection";
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QSslSocket* socket = qobject_cast<QSslSocket*>(sender());
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if (!socket) return;
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// TODO delete me?
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disconnect(socket, QOverload<const QList<QSslError> &>::of(&QSslSocket::sslErrors), this, &LanLinkProvider::sslErrors);
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Q_ASSERT(socket->mode() != QSslSocket::UnencryptedMode);
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LanDeviceLink::ConnectionStarted connectionOrigin = (socket->mode() == QSslSocket::SslClientMode)? LanDeviceLink::Locally : LanDeviceLink::Remotely;
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NetworkPacket* receivedPacket = m_receivedIdentityPackets[socket].np;
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const QString& deviceId = receivedPacket->get<QString>(QStringLiteral("deviceId"));
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addLink(deviceId, socket, receivedPacket, connectionOrigin);
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// Copied from tcpSocketConnected slot, now delete received packet
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delete m_receivedIdentityPackets.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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qCDebug(KDECONNECT_CORE) << "Failing due to " << errors;
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Device* device = Daemon::instance()->getDevice(socket->peerVerifyName());
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if (device) {
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device->unpair();
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}
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delete m_receivedIdentityPackets.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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//I'm the new device and this is the answer to my UDP identity packet (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 (m_server->hasPendingConnections()) {
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QSslSocket* socket = m_server->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, &QAbstractSocket::disconnected,
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socket, &QObject::deleteLater);
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connect(socket, &QIODevice::readyRead,
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this, &LanLinkProvider::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 packet (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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socket->startTransaction();
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const QByteArray data = socket->readLine();
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qCDebug(KDECONNECT_CORE) << "LanLinkProvider received reply:" << data;
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NetworkPacket* np = new NetworkPacket(QLatin1String(""));
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bool success = NetworkPacket::unserialize(data, np);
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if (!success) {
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delete np;
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socket->rollbackTransaction();
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return;
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}
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socket->commitTransaction();
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if (np->type() != PACKET_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 "tcpSocketConnected"
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m_receivedIdentityPackets[socket].np = np;
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const QString& deviceId = np->get<QString>(QStringLiteral("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, &QIODevice::readyRead, this, &LanLinkProvider::dataReceived);
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if (np->get<int>(QStringLiteral("protocolVersion")) >= MIN_VERSION_WITH_SSL_SUPPORT) {
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bool isDeviceTrusted = KdeConnectConfig::instance().trustedDevices().contains(deviceId);
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configureSslSocket(socket, deviceId, isDeviceTrusted);
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qCDebug(KDECONNECT_CORE) << "Starting client ssl (but I'm the server TCP socket)";
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connect(socket, &QSslSocket::encrypted, this, &LanLinkProvider::encrypted);
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if (isDeviceTrusted) {
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connect(socket, QOverload<const QList<QSslError> &>::of(&QSslSocket::sslErrors), this, &LanLinkProvider::sslErrors);
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}
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socket->startClientEncryption();
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} else {
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qWarning() << np->get<QString>(QStringLiteral("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 m_receivedIdentityPackets.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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QMap< QString, LanDeviceLink* >::iterator linkIterator = m_links.find(id);
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Q_ASSERT(linkIterator != m_links.end());
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if (linkIterator != m_links.end()) {
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Q_ASSERT(linkIterator.value() == destroyedDeviceLink);
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m_links.erase(linkIterator);
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auto pairingHandler = m_pairingHandlers.take(id);
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if (pairingHandler) {
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pairingHandler->deleteLater();
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}
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}
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}
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void LanLinkProvider::configureSslSocket(QSslSocket* socket, const QString& deviceId, bool isDeviceTrusted)
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{
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// Setting supported ciphers manually, to match those on Android (FIXME: Test if this can be left unconfigured and still works for Android 4)
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QList<QSslCipher> socketCiphers;
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socketCiphers.append(QSslCipher(QStringLiteral("ECDHE-ECDSA-AES256-GCM-SHA384")));
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socketCiphers.append(QSslCipher(QStringLiteral("ECDHE-ECDSA-AES128-GCM-SHA256")));
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socketCiphers.append(QSslCipher(QStringLiteral("ECDHE-RSA-AES128-SHA")));
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// Configure for ssl
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QSslConfiguration sslConfig;
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sslConfig.setCiphers(socketCiphers);
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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->setPeerVerifyName(deviceId);
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if (isDeviceTrusted) {
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QString certString = KdeConnectConfig::instance().getDeviceProperty(deviceId, QStringLiteral("certificate"), QString());
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socket->addCaCertificate(QSslCertificate(certString.toLatin1()));
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socket->setPeerVerifyMode(QSslSocket::VerifyPeer);
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} else {
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socket->setPeerVerifyMode(QSslSocket::QueryPeer);
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|
}
|
|
|
|
//Usually SSL errors are only bad for trusted devices. Uncomment this section to log errors in any case, for debugging.
|
|
//QObject::connect(socket, static_cast<void (QSslSocket::*)(const QList<QSslError>&)>(&QSslSocket::sslErrors), [](const QList<QSslError>& errors)
|
|
//{
|
|
// Q_FOREACH (const QSslError& error, errors) {
|
|
// qCDebug(KDECONNECT_CORE) << "SSL Error:" << error.errorString();
|
|
// }
|
|
//});
|
|
}
|
|
|
|
void LanLinkProvider::configureSocket(QSslSocket* socket) {
|
|
|
|
socket->setProxy(QNetworkProxy::NoProxy);
|
|
|
|
socket->setSocketOption(QAbstractSocket::KeepAliveOption, QVariant(1));
|
|
|
|
#ifdef TCP_KEEPIDLE
|
|
// time to start sending keepalive packets (seconds)
|
|
int maxIdle = 10;
|
|
setsockopt(socket->socketDescriptor(), IPPROTO_TCP, TCP_KEEPIDLE, &maxIdle, sizeof(maxIdle));
|
|
#endif
|
|
|
|
#ifdef TCP_KEEPINTVL
|
|
// interval between keepalive packets after the initial period (seconds)
|
|
int interval = 5;
|
|
setsockopt(socket->socketDescriptor(), IPPROTO_TCP, TCP_KEEPINTVL, &interval, sizeof(interval));
|
|
#endif
|
|
|
|
#ifdef TCP_KEEPCNT
|
|
// number of missed keepalive packets before disconnecting
|
|
int count = 3;
|
|
setsockopt(socket->socketDescriptor(), IPPROTO_TCP, TCP_KEEPCNT, &count, sizeof(count));
|
|
#endif
|
|
|
|
}
|
|
|
|
void LanLinkProvider::addLink(const QString& deviceId, QSslSocket* socket, NetworkPacket* receivedPacket, LanDeviceLink::ConnectionStarted connectionOrigin)
|
|
{
|
|
// Socket disconnection will now be handled by LanDeviceLink
|
|
disconnect(socket, &QAbstractSocket::disconnected, socket, &QObject::deleteLater);
|
|
|
|
LanDeviceLink* deviceLink;
|
|
//Do we have a link for this device already?
|
|
QMap< QString, LanDeviceLink* >::iterator linkIterator = m_links.find(deviceId);
|
|
if (linkIterator != m_links.end()) {
|
|
//qCDebug(KDECONNECT_CORE) << "Reusing link to" << deviceId;
|
|
deviceLink = linkIterator.value();
|
|
deviceLink->reset(socket, connectionOrigin);
|
|
} else {
|
|
deviceLink = new LanDeviceLink(deviceId, this, socket, connectionOrigin);
|
|
connect(deviceLink, &QObject::destroyed, this, &LanLinkProvider::deviceLinkDestroyed);
|
|
m_links[deviceId] = deviceLink;
|
|
if (m_pairingHandlers.contains(deviceId)) {
|
|
//We shouldn't have a pairinghandler if we didn't have a link.
|
|
//Crash if debug, recover if release (by setting the new devicelink to the old pairinghandler)
|
|
Q_ASSERT(m_pairingHandlers.contains(deviceId));
|
|
m_pairingHandlers[deviceId]->setDeviceLink(deviceLink);
|
|
}
|
|
}
|
|
Q_EMIT onConnectionReceived(*receivedPacket, deviceLink);
|
|
}
|
|
|
|
LanPairingHandler* LanLinkProvider::createPairingHandler(DeviceLink* link)
|
|
{
|
|
LanPairingHandler* ph = m_pairingHandlers.value(link->deviceId());
|
|
if (!ph) {
|
|
ph = new LanPairingHandler(link);
|
|
qCDebug(KDECONNECT_CORE) << "creating pairing handler for" << link->deviceId();
|
|
connect (ph, &LanPairingHandler::pairingError, link, &DeviceLink::pairingError);
|
|
m_pairingHandlers[link->deviceId()] = ph;
|
|
}
|
|
return ph;
|
|
}
|
|
|
|
void LanLinkProvider::userRequestsPair(const QString& deviceId)
|
|
{
|
|
LanPairingHandler* ph = createPairingHandler(m_links.value(deviceId));
|
|
ph->requestPairing();
|
|
}
|
|
|
|
void LanLinkProvider::userRequestsUnpair(const QString& deviceId)
|
|
{
|
|
LanPairingHandler* ph = createPairingHandler(m_links.value(deviceId));
|
|
ph->unpair();
|
|
}
|
|
|
|
void LanLinkProvider::incomingPairPacket(DeviceLink* deviceLink, const NetworkPacket& np)
|
|
{
|
|
LanPairingHandler* ph = createPairingHandler(deviceLink);
|
|
ph->packetReceived(np);
|
|
}
|
|
|