public void run() {
try {
state.setValue(TransportProtocolState.NEGOTIATING_PROTOCOL);
log.info("Registering transport protocol messages with inputstream");
algorithmsOut = new TransportProtocolAlgorithmSync();
algorithmsIn = new TransportProtocolAlgorithmSync();
// Create the input/output streams
sshIn = new TransportProtocolInputStream(this, provider.getInputStream(), algorithmsIn);
sshOut = new TransportProtocolOutputStream(provider.getOutputStream(), this, algorithmsOut);
// Register the transport layer messages that this class will handle
messageStore.registerMessage(SshMsgDisconnect.SSH_MSG_DISCONNECT, SshMsgDisconnect.class);
messageStore.registerMessage(SshMsgIgnore.SSH_MSG_IGNORE, SshMsgIgnore.class);
messageStore.registerMessage(
SshMsgUnimplemented.SSH_MSG_UNIMPLEMENTED, SshMsgUnimplemented.class);
messageStore.registerMessage(SshMsgDebug.SSH_MSG_DEBUG, SshMsgDebug.class);
messageStore.registerMessage(SshMsgKexInit.SSH_MSG_KEX_INIT, SshMsgKexInit.class);
messageStore.registerMessage(SshMsgNewKeys.SSH_MSG_NEWKEYS, SshMsgNewKeys.class);
registerTransportMessages();
List list = SshKeyExchangeFactory.getSupportedKeyExchanges();
Iterator it = list.iterator();
while (it.hasNext()) {
String keyExchange = (String) it.next();
SshKeyExchange kex = SshKeyExchangeFactory.newInstance(keyExchange);
kex.init(this);
kexs.put(keyExchange, kex);
}
// call abstract to initialise the local ident string
setLocalIdent();
// negotiate the protocol version
negotiateVersion();
startBinaryPacketProtocol();
} catch (Throwable e) {
if (e instanceof IOException) {
state.setLastError((IOException) e);
}
if (state.getValue() != TransportProtocolState.DISCONNECTED) {
log.error("The Transport Protocol thread failed", e);
// log.info(e.getMessage());
stop();
}
} finally {
thread = null;
}
log.debug("The Transport Protocol has been stopped");
}
/**
* @throws IOException
* @throws KeyExchangeException
*/
protected void beginKeyExchange() throws IOException, KeyExchangeException {
log.info("Starting key exchange");
// state.setValue(TransportProtocolState.PERFORMING_KEYEXCHANGE);
String kexAlgorithm = "";
// We now have both kex inits, this is where client/server
// implemtations take over so call abstract methods
try {
// Determine the key exchange algorithm
kexAlgorithm = getKexAlgorithm();
if (log.isDebugEnabled()) {
log.debug("Key exchange algorithm: " + kexAlgorithm);
}
// Get an instance of the key exchange algortihm
SshKeyExchange kex = (SshKeyExchange) kexs.get(kexAlgorithm);
// Do the key exchange
performKeyExchange(kex);
// Record the output
exchangeHash = kex.getExchangeHash();
if (sessionIdentifier == null) {
sessionIdentifier = new byte[exchangeHash.length];
System.arraycopy(exchangeHash, 0, sessionIdentifier, 0, sessionIdentifier.length);
thread.setSessionId(sessionIdentifier);
}
hostKey = kex.getHostKey();
signature = kex.getSignature();
k = kex.getSecret();
// Send new keys
sendNewKeys();
kex.reset();
} catch (AlgorithmNotAgreedException e) {
sendDisconnect(
SshMsgDisconnect.KEY_EXCHANGE_FAILED, "No suitable key exchange algorithm was agreed");
throw new KeyExchangeException("No suitable key exchange algorithm could be agreed.");
}
}
