sslserver.cpp

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/*
 # Copyright (c) 2009 - OpenSLX Project, Computer Center University of Freiburg
 #
 # This program is free software distributed under the GPL version 2.
 # See http://openslx.org/COPYING
 #
 # If you have any feedback please consult http://openslx.org/feedback and
 # send your suggestions, praise, or complaints to feedback@openslx.org
 #
 # General information about OpenSLX can be found at http://openslx.org/
 # -----------------------------------------------------------------------------
 # src/net/SslServer.cpp
 #    - provide QTcpServer-like behaviour for SSL
 # -----------------------------------------------------------------------------
 */

#include "sslserver.h"
#include <QtNetwork/QSslCipher>
#include <QtNetwork/QSslSocket>
#include <QTimer>
#include "certmanager.h"
#include <unistd.h>

SslServer::SslServer(QObject *parent)
      : QTcpServer(parent)
      , _timer(new QTimer(this))
{
   connect(_timer, &QTimer::timeout, [=]() {
      if (_pending.empty())
         return;
      const qint64 deadline = QDateTime::currentMSecsSinceEpoch() - 10000;
      QMutableHashIterator<QSslSocket*, qint64> it(_pending);
      while (it.hasNext()) { // Remove lingering connections after 10s
         it.next();
         if (it.value() < deadline) {
            it.key()->blockSignals(true);
            it.key()->deleteLater();
            it.remove();
         }
      }
   });
   _timer->start(10000);
}

SslServer::~SslServer()
{
   _timer->stop();
   auto keys = _pending.keys();
   for (QSslSocket *sock : keys) {
      sock->deleteLater();
   }
   _pending.clear();
}

void SslServer::incomingConnection(qintptr socketDescriptor)
{
   static int certFails = 0;
   QSslKey key;
   QSslCertificate cert;
   if (!CertManager::getPrivateKeyAndCert("manager2", key, cert)) {
      if (++certFails > 5) {
         CertManager::fatal();
      }
      ::close(int(socketDescriptor));
      return;
   }
   auto *serverSocket = new QSslSocket(nullptr);
   connect(serverSocket, QOverload<const QList<QSslError> &>::of(&QSslSocket::sslErrors), this, &SslServer::sslErrors);
   serverSocket->setPrivateKey(key);
   serverSocket->setLocalCertificate(cert);
   serverSocket->setPeerVerifyMode(QSslSocket::VerifyNone);
   serverSocket->setProtocol(QSsl::SecureProtocols);
   if (serverSocket->setSocketDescriptor(socketDescriptor)) {
      _pending.insert(serverSocket, QDateTime::currentMSecsSinceEpoch());
      // Once the connection is successfully encrypted, raise our newConnection event
      connect(serverSocket, &QSslSocket::encrypted, [=]() {
         serverSocket->disconnect(this);
         if (_pending.remove(serverSocket) == 0) {
            // Should never happen, so better log...
            qDebug() << "Encryption event for socket that is not pending!?";
         } else {
            this->addPendingConnection(serverSocket);
            emit newConnection();
         }
      });
      serverSocket->startServerEncryption();
   } else {
      qDebug() << "Failed to setSocketDescriptor on new SSL Socket";
      serverSocket->deleteLater();
   }
}

void SslServer::sslErrors(const QList<QSslError>& errors)
{
   qDebug() << "Client caused sslErrors before connection:";
   for (const auto & error : errors) {
      qDebug() << error.errorString();
   }

}