Here is a method you could use inside a login module. It assumes you extend the 
AbstractServerLoginModule.


  | private Object[] getLoginInfo() throws LoginException {
  | 
  |         if (callbackHandler == null) {
  |             log.warn("No callbackHandler available");
  |             throw new LoginException(
  |                 "Error: no CallbackHandler available " + "to collect 
authentication information");
  |         }
  |         String username = null;
  |         X509Certificate[] certs = null;
  |         NameCallback nc = new NameCallback("username");
  |         ObjectCallback oc = new ObjectCallback("certs");
  |         Callback[] callbacks = { nc, oc };
  |         try {
  |             callbackHandler.handle(callbacks);
  |             username = nc.getName();
  | 
  |             Object credential = oc.getCredential();
  |             if (credential == null || !(credential instanceof X509Certificate[])) {
  |                 log.debug("No X509Certficate chain");
  |                 throw new LoginException("No X509Certficate chain");
  |             }
  |             certs = (X509Certificate[]) credential;
  |         } catch (java.io.IOException ioe) {
  |             throw new LoginException(ioe.toString());
  |         } catch (UnsupportedCallbackException uce) {
  |             throw new LoginException("CallbackHandler does not support: " + 
uce.getCallback());
  |         }
  |         return new Object[] { username, certs };
  |     }
  | 


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