/*
* Read the channel for more information, then unwrap the
* (hopefully application) data we get.
* <P>
* If we run out of data, we'll return to our caller (possibly using
* a Selector) to get notification that more is available.
* <P>
* Each call to this method will perform at most one underlying read().
*/
int read() throws IOException {
SSLEngineResult result;
if (!initialHSComplete) {
throw new IllegalStateException();
}
int pos = requestBB.position();
if (sc.read(inNetBB) == -1) {
sslEngine.closeInbound(); // probably throws exception
return -1;
}
do {
resizeRequestBB(); // expected room for unwrap
inNetBB.flip();
result = sslEngine.unwrap(inNetBB, requestBB);
inNetBB.compact();
/*
* Could check here for a renegotation, but we're only
* doing a simple read/write, and won't have enough state
* transitions to do a complete handshake, so ignore that
* possibility.
*/
switch (result.getStatus()) {
case BUFFER_OVERFLOW:
// Reset the application buffer size.
appBBSize = sslEngine.getSession().getApplicationBufferSize();
break;
case BUFFER_UNDERFLOW:
// Resize buffer if needed.
netBBSize = sslEngine.getSession().getPacketBufferSize();
if (netBBSize > inNetBB.capacity()) {
resizeResponseBB();
break; // break, next read will support larger buffer.
}
case OK:
if (result.getHandshakeStatus() == HandshakeStatus.NEED_TASK) {
doTasks();
}
break;
default:
throw new IOException("sslEngine error during data read: " + result.getStatus());
}
} while ((inNetBB.position() != 0) && result.getStatus() != Status.BUFFER_UNDERFLOW);
return (requestBB.position() - pos);
}
public SSLSession getSSLSession() {
SSLEngine e = connection.getSSLEngine();
if (e == null) {
return null;
}
return e.getSession();
}
/*
* Create and size the buffers appropriately.
*/
private void createBuffers() {
/*
* We'll assume the buffer sizes are the same
* between client and server.
*/
SSLSession session = clientEngine.getSession();
int appBufferMax = session.getApplicationBufferSize();
int netBufferMax = session.getPacketBufferSize();
/*
* We'll make the input buffers a bit bigger than the max needed
* size, so that unwrap()s following a successful data transfer
* won't generate BUFFER_OVERFLOWS.
*
* We'll use a mix of direct and indirect ByteBuffers for
* tutorial purposes only. In reality, only use direct
* ByteBuffers when they give a clear performance enhancement.
*/
clientIn = ByteBuffer.allocate(appBufferMax + 50);
serverIn = ByteBuffer.allocate(appBufferMax + 50);
cTOs = ByteBuffer.allocateDirect(netBufferMax);
sTOc = ByteBuffer.allocateDirect(netBufferMax);
clientOut = ByteBuffer.wrap("Hi Server, I'm Client".getBytes());
serverOut = ByteBuffer.wrap("Hello Client, I'm Server".getBytes());
}
/*
* Constructor for a secure ChannelIO variant.
*/
protected ChannelIOSecure(SocketChannel sc, boolean blocking, SSLContext sslc)
throws IOException {
super(sc, blocking);
/*
* We're a server, so no need to use host/port variant.
*
* The first call for a server is a NEED_UNWRAP.
*/
sslEngine = sslc.createSSLEngine();
sslEngine.setUseClientMode(false);
initialHSStatus = HandshakeStatus.NEED_UNWRAP;
initialHSComplete = false;
// Create a buffer using the normal expected packet size we'll
// be getting. This may change, depending on the peer's
// SSL implementation.
netBBSize = sslEngine.getSession().getPacketBufferSize();
inNetBB = ByteBuffer.allocate(netBBSize);
outNetBB = ByteBuffer.allocate(netBBSize);
outNetBB.position(0);
outNetBB.limit(0);
}
/*
* Run the test.
*
* Sit in a tight loop, both engines calling wrap/unwrap regardless
* of whether data is available or not. We do this until both engines
* report back they are closed.
*
* The main loop handles all of the I/O phases of the SSLEngine's
* lifetime:
*
* initial handshaking
* application data transfer
* engine closing
*
* One could easily separate these phases into separate
* sections of code.
*/
private SSLSession runTest() throws Exception {
boolean dataDone = false;
createSSLEngines();
createBuffers();
SSLEngineResult clientResult; // results from client's last operation
SSLEngineResult serverResult; // results from server's last operation
/*
* Examining the SSLEngineResults could be much more involved,
* and may alter the overall flow of the application.
*
* For example, if we received a BUFFER_OVERFLOW when trying
* to write to the output pipe, we could reallocate a larger
* pipe, but instead we wait for the peer to drain it.
*/
while (!isEngineClosed(clientEngine) || !isEngineClosed(serverEngine)) {
log("================");
clientResult = clientEngine.wrap(clientOut, cTOs);
log("client wrap: ", clientResult);
runDelegatedTasks(clientResult, clientEngine);
serverResult = serverEngine.wrap(serverOut, sTOc);
log("server wrap: ", serverResult);
runDelegatedTasks(serverResult, serverEngine);
cTOs.flip();
sTOc.flip();
log("----");
clientResult = clientEngine.unwrap(sTOc, clientIn);
log("client unwrap: ", clientResult);
runDelegatedTasks(clientResult, clientEngine);
serverResult = serverEngine.unwrap(cTOs, serverIn);
log("server unwrap: ", serverResult);
runDelegatedTasks(serverResult, serverEngine);
cTOs.compact();
sTOc.compact();
/*
* After we've transfered all application data between the client
* and server, we close the clientEngine's outbound stream.
* This generates a close_notify handshake message, which the
* server engine receives and responds by closing itself.
*/
if (!dataDone
&& (clientOut.limit() == serverIn.position())
&& (serverOut.limit() == clientIn.position())) {
/*
* A sanity check to ensure we got what was sent.
*/
checkTransfer(serverOut, clientIn);
checkTransfer(clientOut, serverIn);
log("\tClosing clientEngine's *OUTBOUND*...");
clientEngine.closeOutbound();
dataDone = true;
}
}
return clientEngine.getSession();
}
private SSLSession runRehandshake() throws Exception {
log("\n\n==============================================");
log("Staring actual test.");
createSSLEngines();
createBuffers();
SSLEngineResult result;
log("Client's ClientHello");
checkResult(
clientEngine, clientEngine.wrap(clientOut, cTOs), HandshakeStatus.NEED_UNWRAP, false, true);
cTOs.flip();
checkResult(
serverEngine, serverEngine.unwrap(cTOs, serverIn), HandshakeStatus.NEED_WRAP, true, false);
cTOs.compact();
log("Server's ServerHello/ServerHelloDone");
checkResult(
serverEngine, serverEngine.wrap(serverOut, sTOc), HandshakeStatus.NEED_WRAP, false, true);
sTOc.flip();
checkResult(
clientEngine,
clientEngine.unwrap(sTOc, clientIn),
HandshakeStatus.NEED_UNWRAP,
true,
false);
sTOc.compact();
log("Server's CCS");
checkResult(
serverEngine, serverEngine.wrap(serverOut, sTOc), HandshakeStatus.NEED_WRAP, false, true);
sTOc.flip();
checkResult(
clientEngine,
clientEngine.unwrap(sTOc, clientIn),
HandshakeStatus.NEED_UNWRAP,
true,
false);
sTOc.compact();
log("Server's FINISHED");
checkResult(
serverEngine, serverEngine.wrap(serverOut, sTOc), HandshakeStatus.NEED_UNWRAP, false, true);
sTOc.flip();
checkResult(
clientEngine, clientEngine.unwrap(sTOc, clientIn), HandshakeStatus.NEED_WRAP, true, false);
sTOc.compact();
log("Client's CCS");
checkResult(
clientEngine, clientEngine.wrap(clientOut, cTOs), HandshakeStatus.NEED_WRAP, false, true);
cTOs.flip();
checkResult(
serverEngine,
serverEngine.unwrap(cTOs, serverIn),
HandshakeStatus.NEED_UNWRAP,
true,
false);
cTOs.compact();
log("Client's FINISHED should trigger FINISHED messages all around.");
checkResult(
clientEngine, clientEngine.wrap(clientOut, cTOs), HandshakeStatus.FINISHED, false, true);
cTOs.flip();
checkResult(
serverEngine, serverEngine.unwrap(cTOs, serverIn), HandshakeStatus.FINISHED, true, false);
cTOs.compact();
return clientEngine.getSession();
}
/*
* Perform any handshaking processing.
* <P>
* If a SelectionKey is passed, register for selectable
* operations.
* <P>
* In the blocking case, our caller will keep calling us until
* we finish the handshake. Our reads/writes will block as expected.
* <P>
* In the non-blocking case, we just received the selection notification
* that this channel is ready for whatever the operation is, so give
* it a try.
* <P>
* return:
* true when handshake is done.
* false while handshake is in progress
*/
boolean doHandshake(SelectionKey sk) throws IOException {
SSLEngineResult result;
if (initialHSComplete) {
return initialHSComplete;
}
/*
* Flush out the outgoing buffer, if there's anything left in
* it.
*/
if (outNetBB.hasRemaining()) {
if (!tryFlush(outNetBB)) {
return false;
}
// See if we need to switch from write to read mode.
switch (initialHSStatus) {
/*
* Is this the last buffer?
*/
case FINISHED:
initialHSComplete = true;
// Fall-through to reregister need for a Read.
case NEED_UNWRAP:
if (sk != null) {
sk.interestOps(SelectionKey.OP_READ);
}
break;
}
return initialHSComplete;
}
switch (initialHSStatus) {
case NEED_UNWRAP:
if (sc.read(inNetBB) == -1) {
sslEngine.closeInbound();
return initialHSComplete;
}
needIO:
while (initialHSStatus == HandshakeStatus.NEED_UNWRAP) {
resizeRequestBB(); // expected room for unwrap
inNetBB.flip();
result = sslEngine.unwrap(inNetBB, requestBB);
inNetBB.compact();
initialHSStatus = result.getHandshakeStatus();
switch (result.getStatus()) {
case OK:
switch (initialHSStatus) {
case NOT_HANDSHAKING:
throw new IOException("Not handshaking during initial handshake");
case NEED_TASK:
initialHSStatus = doTasks();
break;
case FINISHED:
initialHSComplete = true;
break needIO;
}
break;
case BUFFER_UNDERFLOW:
// Resize buffer if needed.
netBBSize = sslEngine.getSession().getPacketBufferSize();
if (netBBSize > inNetBB.capacity()) {
resizeResponseBB();
}
/*
* Need to go reread the Channel for more data.
*/
if (sk != null) {
sk.interestOps(SelectionKey.OP_READ);
}
break needIO;
case BUFFER_OVERFLOW:
// Reset the application buffer size.
appBBSize = sslEngine.getSession().getApplicationBufferSize();
break;
default: // CLOSED:
throw new IOException("Received" + result.getStatus() + "during initial handshaking");
}
} // "needIO" block.
/*
* Just transitioned from read to write.
*/
if (initialHSStatus != HandshakeStatus.NEED_WRAP) {
break;
}
// Fall through and fill the write buffers.
case NEED_WRAP:
/*
* The flush above guarantees the out buffer to be empty
*/
outNetBB.clear();
result = sslEngine.wrap(hsBB, outNetBB);
outNetBB.flip();
initialHSStatus = result.getHandshakeStatus();
switch (result.getStatus()) {
case OK:
if (initialHSStatus == HandshakeStatus.NEED_TASK) {
initialHSStatus = doTasks();
}
if (sk != null) {
sk.interestOps(SelectionKey.OP_WRITE);
}
break;
default: // BUFFER_OVERFLOW/BUFFER_UNDERFLOW/CLOSED:
throw new IOException("Received" + result.getStatus() + "during initial handshaking");
}
break;
default: // NOT_HANDSHAKING/NEED_TASK/FINISHED
throw new RuntimeException("Invalid Handshaking State" + initialHSStatus);
} // switch
return initialHSComplete;
}