/* Logs in using the information provided when the 
 * user logged in to the system. Use the command
 * java -Djava.security.auth.login.config=NT.config 
 *      NTclient xxx
 */

import java.util.Set;
import java.security.Principal;
import javax.security.auth.Subject;
import javax.security.auth.login.LoginContext;
import com.sun.security.auth.NTUserPrincipal;
import javax.security.auth.login.FailedLoginException;

public class NTclient {
  public static void main(String[] args) {
    LoginContext context = null;
    try {
      context = new LoginContext("NT");
      context.login();
      Subject subject = context.getSubject();
      System.out.println(subject);
      Set principals = 
          subject.getPrincipals(NTUserPrincipal.class);
      Object[] p = principals.toArray();
      boolean found = false;
      for (int i = 0; i < p.length; i++)
        if( ((Principal)p[i]).getName().equals(args[0]))
          found = true;
      if(found)
         System.out.println("login succeeded");
      else
         throw new FailedLoginException("Login failed");
    }catch(Exception e) {
      e.printStackTrace();
    }
   }
}