src/client/clientauthhandler.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2005-2014 by the Quassel Project                        *
   3  *   devel@quassel-irc.org                                                 *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) version 3.                                           *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.         *
  19  ***************************************************************************/
  20
  21 #include "clientauthhandler.h"
  22
  23 // TODO: support system application proxy (new in Qt 4.6)
  24
  25 #include <QtEndian>
  26
  27 #ifdef HAVE_SSL
  28     #include <QSslSocket>
  29 #else
  30     #include <QTcpSocket>
  31 #endif
  32
  33 #include "client.h"
  34 #include "clientsettings.h"
  35 #include "peerfactory.h"
  36
  37 using namespace Protocol;
  38
  39 ClientAuthHandler::ClientAuthHandler(CoreAccount account, QObject *parent)
  40     : AuthHandler(parent),
  41     _peer(0),
  42     _account(account),
  43     _probing(false),
  44     _legacy(false),
  45     _connectionFeatures(0)
  46 {
  47
  48 }
  49
  50
  51 void ClientAuthHandler::connectToCore()
  52 {
  53     CoreAccountSettings s;
  54
  55 #ifdef HAVE_SSL
  56     QSslSocket *socket = new QSslSocket(this);
  57     // make sure the warning is shown if we happen to connect without SSL support later
  58     s.setAccountValue("ShowNoClientSslWarning", true);
  59 #else
  60     if (_account.useSsl()) {
  61         if (s.accountValue("ShowNoClientSslWarning", true).toBool()) {
  62             bool accepted = false;
  63             emit handleNoSslInClient(&accepted);
  64             if (!accepted) {
  65                 emit errorMessage(tr("Unencrypted connection canceled"));
  66                 return;
  67             }
  68             s.setAccountValue("ShowNoClientSslWarning", false);
  69         }
  70     }
  71     QTcpSocket *socket = new QTcpSocket(this);
  72 #endif
  73
  74 // TODO: Handle system proxy
  75 #ifndef QT_NO_NETWORKPROXY
  76     if (_account.useProxy()) {
  77         QNetworkProxy proxy(_account.proxyType(), _account.proxyHostName(), _account.proxyPort(), _account.proxyUser(), _account.proxyPassword());
  78         socket->setProxy(proxy);
  79     }
  80 #endif
  81
  82     setSocket(socket);
  83     connect(socket, SIGNAL(stateChanged(QAbstractSocket::SocketState)), SLOT(onSocketStateChanged(QAbstractSocket::SocketState)));
  84     connect(socket, SIGNAL(readyRead()), SLOT(onReadyRead()));
  85     connect(socket, SIGNAL(connected()), SLOT(onSocketConnected()));
  86
  87     emit statusMessage(tr("Connecting to %1...").arg(_account.accountName()));
  88     socket->connectToHost(_account.hostName(), _account.port());
  89 }
  90
  91
  92 void ClientAuthHandler::onSocketStateChanged(QAbstractSocket::SocketState socketState)
  93 {
  94     QString text;
  95
  96     switch(socketState) {
  97         case QAbstractSocket::HostLookupState:
  98             if (!_legacy)
  99                 text = tr("Looking up %1...").arg(_account.hostName());
 100             break;
 101         case QAbstractSocket::ConnectingState:
 102             if (!_legacy)
 103                 text = tr("Connecting to %1...").arg(_account.hostName());
 104             break;
 105         case QAbstractSocket::ConnectedState:
 106             text = tr("Connected to %1").arg(_account.hostName());
 107             break;
 108         case QAbstractSocket::ClosingState:
 109             if (!_probing)
 110                 text = tr("Disconnecting from %1...").arg(_account.hostName());
 111             break;
 112         case QAbstractSocket::UnconnectedState:
 113             if (!_probing) {
 114                 text = tr("Disconnected");
 115                 // Ensure the disconnected() signal is sent even if we haven't reached the Connected state yet.
 116                 // The baseclass implementation will make sure to only send the signal once.
 117                 onSocketDisconnected();
 118             }
 119             break;
 120         default:
 121             break;
 122     }
 123
 124     if (!text.isEmpty()) {
 125         emit statusMessage(text);
 126     }
 127 }
 128
 129 void ClientAuthHandler::onSocketError(QAbstractSocket::SocketError error)
 130 {
 131     if (_probing && error == QAbstractSocket::RemoteHostClosedError) {
 132         _legacy = true;
 133         return;
 134     }
 135
 136     _probing = false; // all other errors are unrelated to probing and should be handled
 137     AuthHandler::onSocketError(error);
 138 }
 139
 140
 141 void ClientAuthHandler::onSocketDisconnected()
 142 {
 143     if (_probing && _legacy) {
 144         // Remote host has closed the connection while probing
 145         _probing = false;
 146         disconnect(socket(), SIGNAL(readyRead()), this, SLOT(onReadyRead()));
 147         emit statusMessage(tr("Reconnecting in compatibility mode..."));
 148         socket()->connectToHost(_account.hostName(), _account.port());
 149         return;
 150     }
 151
 152     AuthHandler::onSocketDisconnected();
 153 }
 154
 155
 156 void ClientAuthHandler::onSocketConnected()
 157 {
 158     if (_peer) {
 159         qWarning() << Q_FUNC_INFO << "Peer already exists!";
 160         return;
 161     }
 162
 163     socket()->setSocketOption(QAbstractSocket::KeepAliveOption, true);
 164
 165     if (!_legacy) {
 166         // First connection attempt, try probing for a capable core
 167         _probing = true;
 168
 169         QDataStream stream(socket()); // stream handles the endianness for us
 170
 171         quint32 magic = Protocol::magic;
 172 #ifdef HAVE_SSL
 173         if (_account.useSsl())
 174             magic |= Protocol::Encryption;
 175 #endif
 176         magic |= Protocol::Compression;
 177
 178         stream << magic;
 179
 180         // here goes the list of protocols we support, in order of preference
 181         PeerFactory::ProtoList protos = PeerFactory::supportedProtocols();
 182         for (int i = 0; i < protos.count(); ++i) {
 183             quint32 reply = protos[i].first;
 184             reply |= protos[i].second<<8;
 185             if (i == protos.count() - 1)
 186                 reply |= 0x80000000; // end list
 187             stream << reply;
 188         }
 189
 190         socket()->flush(); // make sure the probing data is sent immediately
 191         return;
 192     }
 193
 194     // If we arrive here, it's the second connection attempt, meaning probing was not successful -> enable legacy support
 195
 196     qDebug() << "Legacy core detected, switching to compatibility mode";
 197
 198     RemotePeer *peer = PeerFactory::createPeer(PeerFactory::ProtoDescriptor(Protocol::LegacyProtocol, 0), this, socket(), Compressor::NoCompression, this);
 199     // Only needed for the legacy peer, as all others check the protocol version before instantiation
 200     connect(peer, SIGNAL(protocolVersionMismatch(int,int)), SLOT(onProtocolVersionMismatch(int,int)));
 201
 202     setPeer(peer);
 203 }
 204
 205
 206 void ClientAuthHandler::onReadyRead()
 207 {
 208     if (socket()->bytesAvailable() < 4)
 209         return;
 210
 211     if (!_probing)
 212         return; // make sure to not read more data than needed
 213
 214     _probing = false;
 215     disconnect(socket(), SIGNAL(readyRead()), this, SLOT(onReadyRead()));
 216
 217     quint32 reply;
 218     socket()->read((char *)&reply, 4);
 219     reply = qFromBigEndian<quint32>(reply);
 220
 221     Protocol::Type type = static_cast<Protocol::Type>(reply & 0xff);
 222     quint16 protoFeatures = static_cast<quint16>(reply>>8 & 0xffff);
 223     _connectionFeatures = static_cast<quint8>(reply>>24);
 224
 225     Compressor::CompressionLevel level;
 226     if (_connectionFeatures & Protocol::Compression)
 227         level = Compressor::BestCompression;
 228     else
 229         level = Compressor::NoCompression;
 230
 231     RemotePeer *peer = PeerFactory::createPeer(PeerFactory::ProtoDescriptor(type, protoFeatures), this, socket(), level, this);
 232     if (!peer) {
 233         qWarning() << "No valid protocol supported for this core!";
 234         emit errorPopup(tr("<b>Incompatible Quassel Core!</b><br>"
 235                            "None of the protocols this client speaks are supported by the core you are trying to connect to."));
 236
 237         requestDisconnect(tr("Core speaks none of the protocols we support"));
 238         return;
 239     }
 240
 241     if (peer->protocol() == Protocol::LegacyProtocol) {
 242         connect(peer, SIGNAL(protocolVersionMismatch(int,int)), SLOT(onProtocolVersionMismatch(int,int)));
 243         _legacy = true;
 244     }
 245
 246     setPeer(peer);
 247 }
 248
 249
 250 void ClientAuthHandler::onProtocolVersionMismatch(int actual, int expected)
 251 {
 252     emit errorPopup(tr("<b>The Quassel Core you are trying to connect to is too old!</b><br>"
 253            "We need at least protocol v%1, but the core speaks v%2 only.").arg(expected, actual));
 254     requestDisconnect(tr("Incompatible protocol version, connection to core refused"));
 255 }
 256
 257
 258 void ClientAuthHandler::setPeer(RemotePeer *peer)
 259 {
 260     qDebug().nospace() << "Using " << qPrintable(peer->protocolName()) << "...";
 261
 262     _peer = peer;
 263     connect(_peer, SIGNAL(transferProgress(int,int)), SIGNAL(transferProgress(int,int)));
 264
 265     // The legacy protocol enables SSL later, after registration
 266     if (!_account.useSsl() || _legacy)
 267         startRegistration();
 268     // otherwise, do it now
 269     else
 270         checkAndEnableSsl(_connectionFeatures & Protocol::Encryption);
 271 }
 272
 273
 274 void ClientAuthHandler::startRegistration()
 275 {
 276     emit statusMessage(tr("Synchronizing to core..."));
 277
 278     // useSsl will be ignored by non-legacy peers
 279     bool useSsl = false;
 280 #ifdef HAVE_SSL
 281     useSsl = _account.useSsl();
 282 #endif
 283
 284     _peer->dispatch(RegisterClient(Quassel::buildInfo().fancyVersionString, useSsl));
 285 }
 286
 287
 288 void ClientAuthHandler::handle(const ClientDenied &msg)
 289 {
 290     emit errorPopup(msg.errorString);
 291     requestDisconnect(tr("The core refused connection from this client"));
 292 }
 293
 294
 295 void ClientAuthHandler::handle(const ClientRegistered &msg)
 296 {
 297     _coreConfigured = msg.coreConfigured;
 298     _backendInfo = msg.backendInfo;
 299
 300     Client::setCoreFeatures(static_cast<Quassel::Features>(msg.coreFeatures));
 301
 302     // The legacy protocol enables SSL at this point
 303     if(_legacy && _account.useSsl())
 304         checkAndEnableSsl(msg.sslSupported);
 305     else
 306         onConnectionReady();
 307 }
 308
 309
 310 void ClientAuthHandler::onConnectionReady()
 311 {
 312     emit connectionReady();
 313     emit statusMessage(tr("Connected to %1").arg(_account.accountName()));
 314
 315     if (!_coreConfigured) {
 316         // start wizard
 317         emit startCoreSetup(_backendInfo);
 318     }
 319     else // TODO: check if we need LoginEnabled
 320         login();
 321 }
 322
 323
 324 void ClientAuthHandler::setupCore(const SetupData &setupData)
 325 {
 326     _peer->dispatch(setupData);
 327 }
 328
 329
 330 void ClientAuthHandler::handle(const SetupFailed &msg)
 331 {
 332     emit coreSetupFailed(msg.errorString);
 333 }
 334
 335
 336 void ClientAuthHandler::handle(const SetupDone &msg)
 337 {
 338     Q_UNUSED(msg)
 339
 340     emit coreSetupSuccessful();
 341 }
 342
 343
 344 void ClientAuthHandler::login(const QString &user, const QString &password, bool remember)
 345 {
 346     _account.setUser(user);
 347     _account.setPassword(password);
 348     _account.setStorePassword(remember);
 349     login();
 350 }
 351
 352
 353 void ClientAuthHandler::login(const QString &previousError)
 354 {
 355     emit statusMessage(tr("Logging in..."));
 356     if (_account.user().isEmpty() || _account.password().isEmpty() || !previousError.isEmpty()) {
 357         bool valid = false;
 358         emit userAuthenticationRequired(&_account, &valid, previousError); // *must* be a synchronous call
 359         if (!valid || _account.user().isEmpty() || _account.password().isEmpty()) {
 360             requestDisconnect(tr("Login canceled"));
 361             return;
 362         }
 363     }
 364
 365     _peer->dispatch(Login(_account.user(), _account.password()));
 366 }
 367
 368
 369 void ClientAuthHandler::handle(const LoginFailed &msg)
 370 {
 371     login(msg.errorString);
 372 }
 373
 374
 375 void ClientAuthHandler::handle(const LoginSuccess &msg)
 376 {
 377     Q_UNUSED(msg)
 378
 379     emit loginSuccessful(_account);
 380 }
 381
 382
 383 void ClientAuthHandler::handle(const SessionState &msg)
 384 {
 385     disconnect(socket(), 0, this, 0); // this is the last message we shall ever get
 386
 387     // give up ownership of the peer; CoreSession takes responsibility now
 388     _peer->setParent(0);
 389     emit handshakeComplete(_peer, msg);
 390 }
 391
 392
 393 /*** SSL Stuff ***/
 394
 395 void ClientAuthHandler::checkAndEnableSsl(bool coreSupportsSsl)
 396 {
 397 #ifndef HAVE_SSL
 398     Q_UNUSED(coreSupportsSsl);
 399 #else
 400     CoreAccountSettings s;
 401     if (coreSupportsSsl && _account.useSsl()) {
 402         // Make sure the warning is shown next time we don't have SSL in the core
 403         s.setAccountValue("ShowNoCoreSslWarning", true);
 404
 405         QSslSocket *sslSocket = qobject_cast<QSslSocket *>(socket());
 406         Q_ASSERT(sslSocket);
 407         connect(sslSocket, SIGNAL(encrypted()), SLOT(onSslSocketEncrypted()));
 408         connect(sslSocket, SIGNAL(sslErrors(QList<QSslError>)), SLOT(onSslErrors()));
 409         qDebug() << "Starting encryption...";
 410         sslSocket->flush();
 411         sslSocket->startClientEncryption();
 412     }
 413     else {
 414         if (s.accountValue("ShowNoCoreSslWarning", true).toBool()) {
 415             bool accepted = false;
 416             emit handleNoSslInCore(&accepted);
 417             if (!accepted) {
 418                 requestDisconnect(tr("Unencrypted connection cancelled"));
 419                 return;
 420             }
 421             s.setAccountValue("ShowNoCoreSslWarning", false);
 422             s.setAccountValue("SslCert", QString());
 423         }
 424         if (_legacy)
 425             onConnectionReady();
 426         else
 427             startRegistration();
 428     }
 429 #endif
 430 }
 431
 432 #ifdef HAVE_SSL
 433
 434 void ClientAuthHandler::onSslSocketEncrypted()
 435 {
 436     QSslSocket *socket = qobject_cast<QSslSocket *>(sender());
 437     Q_ASSERT(socket);
 438
 439     if (!socket->sslErrors().count()) {
 440         // Cert is valid, so we don't want to store it as known
 441         // That way, a warning will appear in case it becomes invalid at some point
 442         CoreAccountSettings s;
 443         s.setAccountValue("SSLCert", QString());
 444     }
 445
 446     emit encrypted(true);
 447
 448     if (_legacy)
 449         onConnectionReady();
 450     else
 451         startRegistration();
 452 }
 453
 454
 455 void ClientAuthHandler::onSslErrors()
 456 {
 457     QSslSocket *socket = qobject_cast<QSslSocket *>(sender());
 458     Q_ASSERT(socket);
 459
 460     CoreAccountSettings s;
 461     QByteArray knownDigest = s.accountValue("SslCert").toByteArray();
 462
 463     if (knownDigest != socket->peerCertificate().digest()) {
 464         bool accepted = false;
 465         bool permanently = false;
 466         emit handleSslErrors(socket, &accepted, &permanently);
 467
 468         if (!accepted) {
 469             requestDisconnect(tr("Unencrypted connection canceled"));
 470             return;
 471         }
 472
 473         if (permanently)
 474             s.setAccountValue("SslCert", socket->peerCertificate().digest());
 475         else
 476             s.setAccountValue("SslCert", QString());
 477     }
 478
 479     socket->ignoreSslErrors();
 480 }
 481
 482 #endif /* HAVE_SSL */