Prueba LDAP

public static void main(String[] args) throws Exception{
        LdapContextSource contextSource = new LdapContextSource();
        contextSource.setUrl("ldap://IP:3268");
        contextSource.setBase("DC=Borrame,DC=COM");
        contextSource.setUserDn(");
        contextSource.setPassword("");
        contextSource.afterPropertiesSet();

        LdapTemplate ldapTemplate = new LdapTemplate(contextSource);
        ldapTemplate.afterPropertiesSet();

        // Perform the authentication.
        Filter filter = new EqualsFilter("sAMAccountName", "usuario");

        boolean authed = ldapTemplate.authenticate("OU=Grupo",
                filter.encode(),
                "");

        // Display the results.
        System.out.println("Authenticated: " + authed);

    //
    //
    }