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// String userSN = "S*"; // Invalid
// String userPassword = "*"; // Invalid
public class LDAPInjection {        
  private void searchRecord(String userSN, String userPassword) throws NamingException {        
    Hashtable env = new Hashtable();
    env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");
    String name = "dc=example,dc=com";
    try {
      Context ctx = new InitialContext(env);		    		    
      DirContext dctx = new InitialDirContext(env);
		    
      SearchControls sc = new SearchControls();
      String[] attributeFilter = {"cn", "mail"};
      sc.setReturningAttributes(attributeFilter);
      sc.setSearchScope(SearchControls.SUBTREE_SCOPE);
      String base = "dc=example,dc=com";

      // The following resolves to (&(sn=S*)(userPassword=*))      
      String filter = "(&(sn=" + userSN + ")(userPassword=" + userPassword + "))"; 

      NamingEnumeration results = dctx.search(base, filter, sc);
      while (results.hasMore()) {
        SearchResult sr = (SearchResult) results.next();
        Attributes attrs = sr.getAttributes();
        Attribute attr = attrs.get("cn");
        System.out.println(attr.get());
        attr = attrs.get("mail");
        System.out.println(attr.get());
      }
      dctx.close();
    } catch (NamingException e) {
      // Handle
    }
  }
}