Hi everyone,
this post relates to the "very old" topic
http://www.java-gaming.org/topics/nio-ssl-server/21984/view started by Riven.
I'm trying to implement HTML 5 "Secure WebSocket" (TLS/SSL) connections with my existing Java Server using NIO channels. Up to now I have successfully implemented unsecure "WebSocket" connections.
Javascript example code for unsecure WebSocket connections
1
| var connection = new WebSocket('ws://192.168.166.150:9005'); |
Javascript example code for secure WebSocket connections
1
| var connection = new WebSocket('wss://192.168.166.150:9005'); |
Javascript Code is executed in Google Chrome or Firefox.
Here's my server side JAVA code called on incoming data
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| private void read(SelectionKey key) throws IOException { SocketChannel socketChannel = (SocketChannel) key.channel();
this.readBuffer.clear();
int numRead; try { numRead = socketChannel.read(this.readBuffer); } catch(IOException e) { this.checkRemoveClient(key); return; }
if(numRead == -1) { this.checkRemoveClient(key); return; } else { Client client = (Client)this.clientList.get(socketChannel.hashCode()); byte[] rawData; if(this.isSSLEnabled()) { this.writeLogMessage("PLAIN DATA read ["+(new String(this.readBuffer.array()))+"]");
this.readBuffer.flip();
ByteBuffer copy = ByteBuffer.allocateDirect(numRead); copy.put(this.readBuffer); copy.flip();
ClientRequestHandlerSSL crhSSL = new ClientRequestHandlerSSL(this, client, sslContext.createSSLEngine(), this.readBuffer.capacity()); crhSSL.receive(copy); } else { rawData = this.readBuffer.array(); ClientRequestHandler crh = new ClientRequestHandler(this, client, rawData, numRead); crh.run(); } } } |
I used the JAVA code example from Riven and adapted it to my existing code architecture for handling SSL data coming over my socket channel:
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| import java.io.IOException; import java.nio.ByteBuffer; import java.nio.channels.SocketChannel; import java.util.concurrent.Executor; import java.util.concurrent.Executors;
import javax.net.ssl.SSLEngine; import javax.net.ssl.SSLEngineResult; import javax.net.ssl.SSLException; import javax.net.ssl.SSLSession;
public class ClientRequestHandlerSSL implements Runnable { private ByteBuffer wrapSrc, unwrapSrc; private ByteBuffer wrapDst, unwrapDst;
private SSLEngine engine; private Executor ioWorker, taskWorkers; private MyServer serverHandle; private SocketChannel socketChannel; private Client client;
public ClientRequestHandlerSSL(MyServer serverHandle, Client client, SSLEngine engine, int bufferSize) { System.out.println("construct read"); this.serverHandle = serverHandle; this.socketChannel = null; this.client = client; System.out.println("Allocate RCV Buffer size: ["+bufferSize+"]"); this.wrapSrc = ByteBuffer.allocateDirect(bufferSize); this.wrapDst = ByteBuffer.allocateDirect(bufferSize);
this.unwrapSrc = ByteBuffer.allocateDirect(bufferSize); this.unwrapDst = ByteBuffer.allocateDirect(bufferSize);
this.unwrapSrc.limit(0);
this.engine = engine; this.engine.setUseClientMode(false); this.engine.setNeedClientAuth(false); this.engine.setWantClientAuth(false); try { this.engine.beginHandshake(); } catch(SSLException e) { this.serverHandle.writeLogMessage("Can not begin handshake ["+e.getMessage()+"]"); } this.ioWorker = Executors.newSingleThreadExecutor(); this.taskWorkers = Executors.newFixedThreadPool(4);
this.ioWorker.execute(this); } public ClientRequestHandlerSSL(MyServer serverHandle, SocketChannel socketChannel, SSLEngine engine, int bufferSize) { System.out.println("construct send"); this.serverHandle = serverHandle; this.socketChannel = socketChannel; this.client = null; System.out.println("Allocate SND Buffer size: ["+bufferSize+"]"); this.wrapSrc = ByteBuffer.allocateDirect(bufferSize); this.wrapDst = ByteBuffer.allocateDirect(bufferSize);
this.unwrapSrc = ByteBuffer.allocateDirect(bufferSize); this.unwrapDst = ByteBuffer.allocateDirect(bufferSize);
this.unwrapSrc.limit(0);
this.engine = engine; this.engine.setUseClientMode(false); this.engine.setNeedClientAuth(false); this.engine.setWantClientAuth(false); try { this.engine.beginHandshake(); } catch(SSLException e) { this.serverHandle.writeLogMessage("Can not begin handshake ["+e.getMessage()+"]"); } this.ioWorker = Executors.newSingleThreadExecutor(); this.taskWorkers = Executors.newFixedThreadPool(4);
this.ioWorker.execute(this); }
public void handleSendData(ByteBuffer decrypted) { try { this.serverHandle.writeLogMessage("SSL data send ["+(new String(decrypted.array()))+"]"); this.socketChannel.write(decrypted); } catch (IOException e) { e.printStackTrace(); } }
public void handleReceivedData(ByteBuffer encrypted) { byte[] dst = new byte[encrypted.remaining()]; encrypted.get(dst);
this.serverHandle.writeLogMessage("SSL data received ["+(new String(dst))+"]"); this.serverHandle.writeLogMessage("======================================================================================="); this.serverHandle.writeLogMessage("SSL data received decoded ["+(MessageDeEncoder.decodeWebSocketFrame(dst))+"]"); }
public void onHandshakeFailure(Exception cause) { System.out.println("handshake failure");
cause.printStackTrace(); }
public void onHandshakeSuccess() { System.out.println("handshake success");
SSLSession session = engine.getSession();
try { System.out.println("- local principal: " + session.getLocalPrincipal()); System.out.println("- remote principal: " + session.getPeerPrincipal()); System.out.println("- using cipher: " + session.getCipherSuite()); } catch (Exception exc) { exc.printStackTrace(); } }
public void onClosed() { }
public void send(final ByteBuffer data) { System.out.println("send"); this.ioWorker.execute(new Runnable() { @Override public void run() { wrapSrc.put(data);
ClientRequestHandlerSSL.this.run(); } }); }
public void receive(final ByteBuffer data) { unwrapSrc.clear(); System.out.println("receive"); this.ioWorker.execute(new Runnable() { @Override public void run() { unwrapSrc.put(data);
ClientRequestHandlerSSL.this.run(); } }); }
public void run() { System.out.println("RUN"); while (this.step()) { continue; } System.out.println("Thread end"); }
private boolean step() { switch (engine.getHandshakeStatus()) { case NOT_HANDSHAKING: System.out.println("not handshaking"); boolean anything = false; { if (wrapSrc.position() > 0) anything |= this.wrap(); if (unwrapSrc.position() > 0) anything |= this.unwrap(); } return anything;
case NEED_WRAP: System.out.println("need wrap"); if (!this.wrap()) return false; break;
case NEED_UNWRAP: System.out.println("need unwrap"); if (!this.unwrap()) return false; break;
case NEED_TASK: System.out.println("need task"); final Runnable sslTask = engine.getDelegatedTask(); Runnable wrappedTask = new Runnable() { @Override public void run() { System.out.println("async SSL task: " + sslTask); long t0 = System.nanoTime(); sslTask.run(); long t1 = System.nanoTime(); System.out.println("async SSL task took: " + (t1 - t0) / 1000000 + "ms");
ioWorker.execute(ClientRequestHandlerSSL.this); } }; taskWorkers.execute(wrappedTask); return false;
case FINISHED: System.out.println("finished"); throw new IllegalStateException("FINISHED"); } System.out.println("true"); return true; }
private boolean wrap() { SSLEngineResult wrapResult;
try { wrapSrc.flip(); wrapResult = engine.wrap(wrapSrc, wrapDst); wrapSrc.compact(); } catch (SSLException exc) { this.onHandshakeFailure(exc); return false; }
switch (wrapResult.getStatus()) { case OK: System.out.println("Wrap: OK"); if (wrapDst.position() > 0) { wrapDst.flip(); System.out.println("calling handleReceiveData"); this.handleReceivedData(wrapDst); wrapDst.compact(); } break;
case BUFFER_UNDERFLOW: System.out.println("Wrap: Buffer underflow"); break;
case BUFFER_OVERFLOW: System.out.println("Wrap: Buffer overflow"); throw new IllegalStateException("failed to wrap");
case CLOSED: this.onClosed(); return false; }
return true; }
private boolean unwrap() { SSLEngineResult unwrapResult;
try { unwrapSrc.flip(); unwrapResult = engine.unwrap(unwrapSrc, unwrapDst); unwrapSrc.compact(); } catch (SSLException exc) { this.onHandshakeFailure(exc); return false; }
switch (unwrapResult.getStatus()) { case OK: System.out.println("Unwrap: OK"); if (unwrapDst.position() > 0) { unwrapDst.flip(); System.out.println("calling handleSendData"); this.handleSendData(unwrapDst); unwrapDst.compact(); } break;
case CLOSED: this.onClosed(); return false;
case BUFFER_OVERFLOW: throw new IllegalStateException("failed to unwrap");
case BUFFER_UNDERFLOW: System.out.println("Unwrap: Buffer underflow"); return false; }
switch (unwrapResult.getHandshakeStatus()) { case FINISHED: this.onHandshakeSuccess(); return false; }
return true; } } |
My SSLContext implementation
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| KeyStore ks = KeyStore.getInstance("JKS"); KeyStore ts = KeyStore.getInstance("JKS"); FileInputStream fin = new FileInputStream(keyStoreFilePath); ks.load(fin, keyStoreFilePassword.toCharArray()); KeyManagerFactory kmf = KeyManagerFactory.getInstance("SunX509"); kmf.init(ks, keyStoreFilePassword.toCharArray()); TrustManagerFactory tmf = TrustManagerFactory.getInstance("SunX509"); tmf.init(ts); sslContext = SSLContext.getInstance("TLS"); sslContext.init(kmf.getKeyManagers(), tmf.getTrustManagers(), null); |
This is the result printed by ClientRequestHandlerSSL class to eclipse console when I open the secure websocket in Chrome:
construct read
Allocate RCV Buffer size: [65536]
receive
RUN
need unwrap
Unwrap: Buffer underflow
Thread end
RUN
need unwrap
Unwrap: OK
true
need task
Thread end
async SSL task: sun.security.ssl.Handshaker$DelegatedTask@1d0fe80
async SSL task took: 44ms
RUN
need wrap
Wrap: OK
calling handleReceiveData
true
need unwrap
Unwrap: Buffer underflow
Thread end
The code seems to work as but the result data written to my server logfile by "handleReceivedData" seems to be messed up. I can partially see data of my SSL certificate along with unreadable data. Obviously I do something terribly wrong.
I hope someone can please point me in the right direction?
