Re: does this ldap code work?

Nigel Wade <>
Tue, 29 Aug 2006 10:23:51 +0100
<ed1138$td$> wrote:


I dont have an ldap server, tested this at work without success - but I
may in the wrong server something - can you tell me if this code alone
is enough to purely authenticate against an LDAP server? Do I need
other key properties - I tried port 389 without success - I get a timed
out error.

import javax.naming.Context;
import javax.naming.NamingException;

public class LdapAuthentication {

      private String initialContext = "com.sun.jndi.ldap.LdapCtxFactory";
      private String authenticationMethod = "simple";
      private String providerUrl = "ldap://ldap:636";

the format is protocol://hostname:port. If your ldap server is called "ldap"
this should be ok. Also, remember that 636 implies that the server is
configured to handle SSL, so you will need:

            env.put(Context.SECURITY_PROTOCOL, "ssl");

added to the environment.

      public LdapAuthentication() {

      public void authenticate (String username, String password) throws
InvalidUserLoginException {
        DirContext ctx = null;
        try {
            ctx = getContext(username, password);
        } catch (NamingException ne) {
            throw new InvalidUserLoginException(ne.toString());
        } finally {
            if (ctx != null) {
                try {
                } catch (NamingException ne) {

    protected DirContext getContext(String username, String password)
throws NamingException {
        Hashtable env = new Hashtable();

        env.put(Context.INITIAL_CONTEXT_FACTORY, initialContext);
        env.put(Context.PROVIDER_URL, providerUrl);
        env.put(Context.SECURITY_PRINCIPAL, username);
        env.put(Context.SECURITY_CREDENTIALS, password);

The SECURITY_CREDENTIALS should be set to a byte array, so use
password.getBytes() here.

        DirContext ctx = new InitialDirContext(env);
        return ctx;


Appart from those couple of points, it looks ok.

Nigel Wade, System Administrator, Space Plasma Physics Group,
            University of Leicester, Leicester, LE1 7RH, UK
E-mail :
Phone : +44 (0)116 2523548, Fax : +44 (0)116 2523555

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