示例#1
0
  /** {@inheritDoc} */
  @Override
  public RawPacket transform(RawPacket pkt) {
    byte[] buf = pkt.getBuffer();
    int off = pkt.getOffset();
    int len = pkt.getLength();

    // If the specified pkt represents a DTLS record, then it should pass
    // through this PacketTransformer (e.g. it has been sent through
    // DatagramTransportImpl).
    if (isDtlsRecord(buf, off, len)) return pkt;

    // SRTP
    if (!transformEngine.isSrtpDisabled()) {
      // DTLS-SRTP has not been initialized yet or has failed to
      // initialize.
      SinglePacketTransformer srtpTransformer = waitInitializeAndGetSRTPTransformer();

      if (srtpTransformer != null) pkt = srtpTransformer.transform(pkt);
      else if (DROP_UNENCRYPTED_PKTS) pkt = null;
      // XXX Else, it is our explicit policy to let the received packet
      // pass through and rely on the SrtpListener to notify the user that
      // the session is not secured.
    }
    // Pure/non-SRTP DTLS
    else {
      // The specified pkt will pass through this PacketTransformer only
      // if it gets transformed into a DTLS record.
      pkt = null;

      sendApplicationData(buf, off, len);
    }
    return pkt;
  }
示例#2
0
  /**
   * Runs in {@link #connectThread} to initialize {@link #dtlsTransport}.
   *
   * @param dtlsProtocol
   * @param tlsPeer
   * @param datagramTransport
   */
  private void runInConnectThread(
      DTLSProtocol dtlsProtocol, TlsPeer tlsPeer, DatagramTransport datagramTransport) {
    DTLSTransport dtlsTransport = null;
    final boolean srtp = !transformEngine.isSrtpDisabled();
    int srtpProtectionProfile = 0;
    TlsContext tlsContext = null;

    // DTLS client
    if (dtlsProtocol instanceof DTLSClientProtocol) {
      DTLSClientProtocol dtlsClientProtocol = (DTLSClientProtocol) dtlsProtocol;
      TlsClientImpl tlsClient = (TlsClientImpl) tlsPeer;

      for (int i = CONNECT_TRIES - 1; i >= 0; i--) {
        if (!enterRunInConnectThreadLoop(i, datagramTransport)) break;
        try {
          dtlsTransport = dtlsClientProtocol.connect(tlsClient, datagramTransport);
          break;
        } catch (IOException ioe) {
          if (!handleRunInConnectThreadException(
              ioe, "Failed to connect this DTLS client to a DTLS" + " server!", i)) {
            break;
          }
        }
      }
      if (dtlsTransport != null && srtp) {
        srtpProtectionProfile = tlsClient.getChosenProtectionProfile();
        tlsContext = tlsClient.getContext();
      }
    }
    // DTLS server
    else if (dtlsProtocol instanceof DTLSServerProtocol) {
      DTLSServerProtocol dtlsServerProtocol = (DTLSServerProtocol) dtlsProtocol;
      TlsServerImpl tlsServer = (TlsServerImpl) tlsPeer;

      for (int i = CONNECT_TRIES - 1; i >= 0; i--) {
        if (!enterRunInConnectThreadLoop(i, datagramTransport)) break;
        try {
          dtlsTransport = dtlsServerProtocol.accept(tlsServer, datagramTransport);
          break;
        } catch (IOException ioe) {
          if (!handleRunInConnectThreadException(
              ioe, "Failed to accept a connection from a DTLS client!", i)) {
            break;
          }
        }
      }
      if (dtlsTransport != null && srtp) {
        srtpProtectionProfile = tlsServer.getChosenProtectionProfile();
        tlsContext = tlsServer.getContext();
      }
    } else {
      // It MUST be either a DTLS client or a DTLS server.
      throw new IllegalStateException("dtlsProtocol");
    }

    SinglePacketTransformer srtpTransformer =
        (dtlsTransport == null || !srtp)
            ? null
            : initializeSRTPTransformer(srtpProtectionProfile, tlsContext);
    boolean closeSRTPTransformer;

    synchronized (this) {
      if (Thread.currentThread().equals(this.connectThread)
          && datagramTransport.equals(this.datagramTransport)) {
        this.dtlsTransport = dtlsTransport;
        _srtpTransformer = srtpTransformer;
        notifyAll();
      }
      closeSRTPTransformer = (_srtpTransformer != srtpTransformer);
    }
    if (closeSRTPTransformer && srtpTransformer != null) srtpTransformer.close();
  }
示例#3
0
  /** {@inheritDoc} */
  @Override
  public RawPacket reverseTransform(RawPacket pkt) {
    byte[] buf = pkt.getBuffer();
    int off = pkt.getOffset();
    int len = pkt.getLength();

    if (isDtlsRecord(buf, off, len)) {
      if (rtcpmux && Component.RTCP == componentID) {
        // This should never happen.
        logger.warn(
            "Dropping a DTLS record, because it was received on the"
                + " RTCP channel while rtcpmux is in use.");
        return null;
      }

      boolean receive;

      synchronized (this) {
        if (datagramTransport == null) {
          receive = false;
        } else {
          datagramTransport.queueReceive(buf, off, len);
          receive = true;
        }
      }
      if (receive) {
        DTLSTransport dtlsTransport = this.dtlsTransport;

        if (dtlsTransport == null) {
          // The specified pkt looks like a DTLS record and it has
          // been consumed for the purposes of the secure channel
          // represented by this PacketTransformer.
          pkt = null;
        } else {
          try {
            int receiveLimit = dtlsTransport.getReceiveLimit();
            int delta = receiveLimit - len;

            if (delta > 0) {
              pkt.grow(delta);
              buf = pkt.getBuffer();
              off = pkt.getOffset();
              len = pkt.getLength();
            } else if (delta < 0) {
              pkt.shrink(-delta);
              buf = pkt.getBuffer();
              off = pkt.getOffset();
              len = pkt.getLength();
            }

            int received = dtlsTransport.receive(buf, off, len, DTLS_TRANSPORT_RECEIVE_WAITMILLIS);

            if (received <= 0) {
              // No application data was decoded.
              pkt = null;
            } else {
              delta = len - received;
              if (delta > 0) pkt.shrink(delta);
            }
          } catch (IOException ioe) {
            pkt = null;
            // SrtpControl.start(MediaType) starts its associated
            // TransformEngine. We will use that mediaType to signal
            // the normal stop then as well i.e. we will ignore
            // exception after the procedure to stop this
            // PacketTransformer has begun.
            if (mediaType != null && !tlsPeerHasRaisedCloseNotifyWarning) {
              logger.error("Failed to decode a DTLS record!", ioe);
            }
          }
        }
      } else {
        // The specified pkt looks like a DTLS record but it is
        // unexpected in the current state of the secure channel
        // represented by this PacketTransformer. This PacketTransformer
        // has not been started (successfully) or has been closed.
        pkt = null;
      }
    } else if (transformEngine.isSrtpDisabled()) {
      // In pure DTLS mode only DTLS records pass through.
      pkt = null;
    } else {
      // DTLS-SRTP has not been initialized yet or has failed to
      // initialize.
      SinglePacketTransformer srtpTransformer = waitInitializeAndGetSRTPTransformer();

      if (srtpTransformer != null) pkt = srtpTransformer.reverseTransform(pkt);
      else if (DROP_UNENCRYPTED_PKTS) pkt = null;
      // XXX Else, it is our explicit policy to let the received packet
      // pass through and rely on the SrtpListener to notify the user that
      // the session is not secured.
    }
    return pkt;
  }