title: How can I get the Client Certificate in Netty Handler to identify user?
body: <p>I am successfully running Netty with 2-way SSL (see <a href="https://stackoverflow.com/questions/9573894/set-up-netty-with-2-way-ssl-handsake-client-and-server-certificate">Set up Netty with 2-way SSL Handsake (client and server certificate)</a>).  </p>
  
  <p>However, in some of my handlers, I need to know about the user who is using the application.  I find that I can't figure out how to get information like the user certificate DN in my handlers. </p>
  
  <p>I would think it would be available in the ChannelHandlerContext somewhere but it is not.  Any suggestions?</p>
  
  <p>I know the SSLEngine has access to it somewhere, but I don't see anything about obtaining access in the SSLEngine public API.  I know it has access in the handshake operation.... but how do I get it?</p>