Fetching NT Authentication details using java

Question

I am accesing a jsp page of tomcat server in my machine from a browser client in another machine.I have to fetch the OS User name with which the user logged in the client machine using java.I tried using request.getRemoteHost() but it returned null.
I tried using NTLM .This is the code which i used
<%@ page language="java" import="java.io.*,java.util.*,java.lang.* " %>
<%@ page import="org.castor.util.*"%>
<%
String auth = request.getHeader("Authorization");
if (auth == null)
  response.setStatus(response.SC_UNAUTHORIZED);
  response.setHeader("WWW-Authenticate", "NTLM");
  response.flushBuffer();
  return;
if (auth.startsWith("NTLM "))
  byte[] msg = new sun.misc.BASE64Decoder().decodeBuffer(auth.substring(5));
  int off = 0, length, offset;
  if (msg[8] == 1)
    byte z = 0;
    byte[] msg1 = {(byte)'N', (byte)'T', (byte)'L', (byte)'M', (byte)'S', (byte)'S', (byte)'P', z,(byte)2, z, z, z, z, z, z, z,(byte)40, z, z, z, (byte)1, (byte)130, z, z,z, (byte)2, (byte)2, (byte)2, z, z, z, z, z, z, z, z, z, z, z, z};
    response.setHeader("WWW-Authenticate", "NTLM " + new sun.misc.BASE64Encoder().encodeBuffer(msg1));
    response.sendError(response.SC_UNAUTHORIZED);
    return;
  else if (msg[8] == 3)
    off = 30;
    length = msg[off+17]*256 + msg[off+16];
    offset = msg[off+19]*256 + msg[off+18];
    String remoteHost = new String(msg, offset, length);
    length = msg[off+1]*256 + msg[off];
    offset = msg[off+3]*256 + msg[off+2];
    String domain = new String(msg, offset, length);
    length = msg[off+9]*256 + msg[off+8];
    offset = msg[off+11]*256 + msg[off+10];
    String username = new String(msg, offset, length);
    out.println("Username:"+username+"<BR>");
    out.println("RemoteHost:"+remoteHost+"<BR>");
    out.println("Domain:"+domain+"<BR>");
%>But it didnt work.Should i configure my environment in any way for NTLM to work?
Is there anyother way to do this.Any code will be appreciated.
Thanks,
Vignesh

Answer 1

JSP's execute on the server and not on the client machine. So I'm not sure how you exect to get details from the client here. Not to mention that JSP you wrote is pretty nasty IMO.