Ejemplo n.º 1
0
  /**
   * makes a connection to a hidden service
   *
   * @param sp hostname, port to connect to and other stuff
   * @return some socket-thing
   */
  private TCPStream connectToHidden(TCPStreamProperties spo) throws IOException {
    // check, if tor is still in startup-phase
    checkStartup();
    Circuit myRendezvousCirc = null;
    Server hiddenServer;
    Node hiddenNode = null;

    // String address, x, y;
    String z;
    // Iterator it, i, i2;
    byte[] cookie = new byte[20];
    // boolean notFound;
    int j;

    z = (String) Encoding.parseHiddenAddress(spo.hostname).get("z");

    // Do we already have a connection to this address?
    if (hiddenServiceCircuits.containsKey(z)) {
      // TODO assess suitability of this circuit
      System.out.println("Reusing existing circuit");
      TCPStreamProperties tcpProps = new TCPStreamProperties("", spo.port);
      try {
        return new TCPStream(hiddenServiceCircuits.get(z), tcpProps);
      } catch (TorNoAnswerException e) {
        // Create a new circuit instead
        e.printStackTrace();
      } catch (TorException e) {
        // Create a new circuit instead
        e.printStackTrace();
      }
    }

    // get a copy from the service descriptor (either local cache or
    // retrieve form network)
    ServiceDescriptor sd = (ServiceDescriptor) cachedServiceDescriptors.get(z);
    if (sd == null || (!sd.checkTimeStampValidity())) {
      sd = ServiceDescriptor.loadFromDirectory(z, this);
      cachedServiceDescriptors.put(z, sd); // cache it
    }

    boolean establishedRendezvous = false;
    j = 0; // attempts counted
    // spo.connect_retries try to establish rendezvous
    while ((j < spo.connect_retries) && (!establishedRendezvous)) {
      j++;
      try {
        myRendezvousCirc = fnh.provideSuitableNewCircuit(new TCPStreamProperties());
        String rendezvousName =
            myRendezvousCirc.route[myRendezvousCirc.route_established - 1].server.nickname;

        Logger.logGeneral(
            Logger.INFO,
            "Tor.connectToHidden: establishing rendezvous point for "
                + z
                + " at "
                + rendezvousName);
        Random rnd = new Random();
        rnd.nextBytes(cookie);

        myRendezvousCirc.send_cell(new CellRelayEstablishRendezvous(myRendezvousCirc, cookie));
        myRendezvousCirc.streamHistory.add(spo.hostname);

        // wait for answer
        CellRelay rendezvousACK =
            myRendezvousCirc.queue.receiveRelayCell(CellRelay.CELL_RELAY_RENDEZVOUS_ESTABLISHED);
        if (rendezvousACK.length > 0) {
          throw new TorException("Tor.connectToHidden: Got NACK from RENDEZVOUS Point");
        }
        myRendezvousCirc.sd = sd;

        hiddenServer = new Server(this, sd.publicKey);
        hiddenNode = new Node(hiddenServer); // between HS and
        // Rendezvous point

        establishedRendezvous = true;

      } catch (IOException e) {
        e.printStackTrace();
      } catch (TorException e) {
        e.printStackTrace();
      }
    }

    if (!establishedRendezvous) {
      Logger.logGeneral(
          Logger.WARNING, "Tor.connectToHidden: coudn't establishing rendezvous point for " + z);
      throw new IOException("Tor.connectToHidden: coudn't establishing rendezvous point for " + z);
    }

    Iterator<IntroductionPoint> it3 = sd.introPoints.iterator();
    String rendezvousName =
        myRendezvousCirc.route[myRendezvousCirc.route.length - 1].server.nickname;

    while (it3.hasNext()) {
      IntroductionPoint iPoint = (IntroductionPoint) it3.next();
      Logger.logGeneral(
          Logger.INFO,
          "Tor.connectToHidden: contacting introduction point "
              + iPoint.getNickname()
              + " for "
              + z);

      // introduce rendezvous to the node
      TCPStreamProperties spIntro = new TCPStreamProperties();

      spIntro.exitPolicyRequired = false;
      //            Server sr = iPoint.getSrv();
      spIntro.setCustomExitpoint(iPoint.getNickname());

      try {
        // make new circ where the last node is intro point
        Circuit myIntroCirc = new Circuit(this, fnh, dir, spIntro);

        // System.out.println(" LAST NODE IS... " +
        // myIntroCirc.route[myIntroCirc.route.length-1].server.name);

        // and CellIntro1 data encrypted with PK of Hidden Service, and _not_ of the introPoint
        myIntroCirc.send_cell(
            new CellRelayIntroduce1(myIntroCirc, cookie, sd, rendezvousName, hiddenNode));

        // wait for ack
        CellRelay introACK =
            myIntroCirc.queue.receiveRelayCell(CellRelay.CELL_RELAY_COMMAND_INTRODUCE_ACK);
        if (introACK.length > 0)
          throw new TorException("Tor.connectToHidden: Got NACK from Introduction Point");
        // introduce ACK is received
        Logger.logGeneral(Logger.RAW_DATA, "Tor.connectToHidden: Got ACK from Intro Point");

        myIntroCirc.close(true);

        // wait for answer from the hidden service (RENDEZVOUS2)
        int oldTimeout = myRendezvousCirc.queue.timeout;
        if (oldTimeout < 120 * 1000) myRendezvousCirc.queue.timeout = 120 * 1000;
        CellRelay r2Relay =
            myRendezvousCirc.queue.receiveRelayCell(CellRelay.CELL_RELAY_RENDEZVOUS2);
        myRendezvousCirc.queue.timeout = oldTimeout;
        // finish diffie-hellman
        byte[] dh_gy = new byte[148];
        System.arraycopy(r2Relay.data, 0, dh_gy, 0, 148);
        hiddenNode.finish_dh(dh_gy);

        myRendezvousCirc.addNode(hiddenNode);

        Logger.logGeneral(
            Logger.INFO, "Tor.connectToHidden: succesfully established rendezvous with " + z);
        // address in begin cell set to "";
        TCPStreamProperties tcpProps = new TCPStreamProperties("", spo.port);

        if (hiddenServiceCircuits.containsKey(z)) hiddenServiceCircuits.remove(z);
        hiddenServiceCircuits.put(z, myRendezvousCirc);

        // connect
        return new TCPStream(myRendezvousCirc, tcpProps);
      } catch (TorException e) {
        e.printStackTrace();
      } catch (InterruptedException e) {
        e.printStackTrace();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }

    // all intros failed...
    // perhaps there is something wrong with out cached service descriptor
    cachedServiceDescriptors.remove(z);
    throw new IOException("Tor.connectToHidden: couldn't connect to an introduction point of " + z);
  }
Ejemplo n.º 2
0
  /**
   * makes a connection to a remote service
   *
   * @param sp hostname, port to connect to and other stuff
   * @return some socket-thing
   */
  public TCPStream connect(TCPStreamProperties sp) throws IOException, TorResolveFailedException {
    // Tor.log.logGeneral(Logger.VERBOSE, "Tor: Trying to connect to " + sp.hostname);

    if (sp.hostname == null) throw new IOException("Tor: no hostname is provided");

    // check, if tor is still in startup-phase
    checkStartup();

    // check whether the address is hidden
    if (sp.hostname.endsWith(".onion")) return connectToHidden(sp);

    boolean resolveException = false;

    Circuit[] cs = fnh.provideSuitableCircuits(sp, false);
    if (TorConfig.veryAggressiveStreamBuilding) {

      for (int j = 0; j < cs.length; ++j) {
        // start N asynchronous stream building threads
        try {
          StreamThread[] streamThreads = new StreamThread[cs.length];
          for (int i = 0; i < cs.length; ++i) streamThreads[i] = new StreamThread(cs[i], sp);
          // wait for the first stream to return
          int chosenStream = -1;
          int waitingCounter = TorConfig.queueTimeoutStreamBuildup * 1000 / 10;
          while ((chosenStream < 0) && (waitingCounter >= 0)) {
            boolean atLeastOneAlive = false;
            for (int i = 0; (i < cs.length) && (chosenStream < 0); ++i)
              if (!streamThreads[i].isAlive()) {
                if ((streamThreads[i].stream != null) && (streamThreads[i].stream.established)) {
                  chosenStream = i;
                }
              } else {
                atLeastOneAlive = true;
              }
            if (!atLeastOneAlive) break;
            Common.sleep(10);
            --waitingCounter;
          }
          // return one and close others
          if (chosenStream >= 0) {
            TCPStream returnValue = streamThreads[chosenStream].stream;
            new ClosingThread(streamThreads, chosenStream);
            return returnValue;
          }
        } catch (Exception e) {
          Logger.logStream(Logger.WARNING, "Tor.connect(): " + e.getMessage());
          return null;
        }
      }

    } else {
      // build serial N streams, stop if successful
      for (int i = 0; i < cs.length; ++i) {
        try {
          return new TCPStream(cs[i], sp);
        } catch (TorResolveFailedException e) {
          Logger.logStream(Logger.WARNING, "Tor.connect: Resolve failed:" + e.getMessage());
          resolveException = true;
        } catch (TorNoAnswerException e) {
          Logger.logStream(Logger.WARNING, "Tor.connect: Timeout on circuit:" + e.getMessage());
        } catch (TorException e) {
          Logger.logStream(
              Logger.WARNING,
              "Tor.connect: TorException trying to reuse existing circuit:" + e.getMessage());
        } catch (IOException e) {
          Logger.logStream(Logger.WARNING, "Tor.connect: IOException " + e.getMessage());
        }
      }
    }

    if (resolveException) throw new TorResolveFailedException();

    throw new IOException(
        "Tor.connect: unable to connect to "
            + sp.hostname
            + ":"
            + sp.port
            + " after "
            + sp.connect_retries
            + " retries");
  }