SSL and SocketChannel

Question

Ideally, I only need a simple SSLSocketChannel.

I already have a component that reads and writes message over ordinary SocketChannel, but for some of these connections, I have to use SSL over the wire; the operations over these connections, however, are the same.

Does anyone knows a free SSLSocketChannel implementation (with the appropriate selector) or something similar? I've found this, but the selector doesn't accept it since its vendor isn't SUN.

I'm decoupling the reading_from/writing_to net logic from the insertion and retrieval of network data via a simple object, in order to use a SSLEngine without getting mad, but it's really tricky to implement that correctly, given the fact that I don't know the internals of SSL protocol...

Answer 1

Check out Restlet's implementation it may do what you need, and it's all about NIO.

Restlet Engine Javadoc

Specifically the HttpClientCall. SetProtocol(HTTPS) - getResponseEntityChannel returns a ReadableByteChannel (getEntityChannel returns a WriteableByteChannel)

Answer 2

Jetty has an NIO SSL implementation for their server: SslSelectorChannelConnector. You might want to peek at it for details on what its doing.

There is also an old (but decent) article from O'Reilly that explains the details about NIO + SSL along with example code.

Answer 3

TLS Channel is a simple library that does exactly that: wrapping a SSLContext (or SSLEngine) and exposing a ByteChannel interface, doing the heavy lifting internally.

(Disclaimer: I am the library's main author).

Answer 4

Not sure if this is what you're looking for, but may help... To create SSL/TLS enabled server sockets, I'm currently using code like the following (keystore.jks contains a self signed private/public key pair used for securing confirmation) - clients have a similar trust store which contains the signed certificate with the public key of that pair.

A bit of googling around getting that configured should get you underway.

String keyStorePath = "keystore.jks";
String keyStorePassword = "password";

KeyManagerFactory keyManagerFactory = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
KeyStore keyStore = new KeyStore();
keyStore.load(new FileInputStream(keyStorePath), keyStorePassword);
keyManagerFactory.init(keyStore, keyStorePassword.toCharArray());

sslContext = SSLContext.getInstance("TLS");
sslContext.init(keyManagerFactory.getKeyManagers(), null, new SecureRandom());

SSLContext sslContext = getServerSSLContext(namespace.getUuid());
SSLServerSocketFactory serverSocketFactory = sslContext.getServerSocketFactory();

// Create sockets as necessary