/** Secure the web server with kerberos (AuthenticationFilter). */
void setupSpnegoFilter(Builder b) throws IOException {
Map<String, String> params = new HashMap<String, String>();
params.put("kerberos.principal", SecurityUtil.getServerPrincipal(b.spnegoPrincipal, b.host));
params.put("kerberos.keytab", b.spnegoKeytab);
params.put(AuthenticationFilter.AUTH_TYPE, "kerberos");
FilterHolder holder = new FilterHolder();
holder.setClassName(AuthenticationFilter.class.getName());
holder.setInitParameters(params);
ServletHandler handler = webAppContext.getServletHandler();
handler.addFilterWithMapping(holder, "/*", FilterMapping.ALL);
}