SpringBoot, how to Authenticate with LDAP without using ldif?

Question

I am trying out the LDAP Authentication example in SpringBoot here

It is using the ldif approach which I think is not applicable to my requirements because our ldap admin wont tell me where to find the ldif that I need. Before springboot I used to use my own ldap implementation not using ldif. Is there a way to validate not using ldif just the SECURITY_AUTHENTICATION.simple ? Below is how I do ldap security in basic Java no spring. How do I do this in spring without using ldif just basic username password.

boolean isLdapRegistred(String username, String password) {
    boolean result = false;
    try {

        Hashtable<String, String> env = new Hashtable<String, String>();
        env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");
        env.put(Context.PROVIDER_URL, "ldap://10.x.x.x:389");           
        env.put(Context.SECURITY_AUTHENTICATION, "simple");         
        env.put(Context.SECURITY_PRINCIPAL, "OUR-DOMAIN\\" + username);
        env.put(Context.SECURITY_CREDENTIALS, password);

        // Create the initial context
        DirContext ctx = new InitialDirContext(env);
        result = ctx != null;
        if (ctx != null)
        ctx.close();
        System.out.println(result);
        return result;
    } catch (Exception e) {
        System.out.println("oops");
        return result;
    }

}

Below is SpringBoots example need to use my credentials instead of ldif.

@Configuration
protected static class AuthenticationConfiguration extends
        GlobalAuthenticationConfigurerAdapter {

    @Override
    public void init(AuthenticationManagerBuilder auth) throws Exception {
        auth
            .ldapAuthentication()
                .userDnPatterns("uid={0},ou=people")
                .groupSearchBase("ou=groups")
                .contextSource().ldif("classpath:test-server.ldif");
    }
}

Answer 1

this one has worked perfectly for me but I need to make tiny modifications to it.

    @Configuration
    @EnableWebSecurity
    public class HttpSecurityConfig extends WebSecurityConfigurerAdapter {
        @Autowired
        public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
            auth.authenticationProvider(ldapAuthenticationProvider());
        }

        @Bean
        public AuthenticationProvider ldapAuthenticationProvider() throws Exception {
            DefaultSpringSecurityContextSource contextSource = new DefaultSpringSecurityContextSource(
Arrays.asList("ldapServerUrl:port"),rootDn);
            contextSource.afterPropertiesSet();
            LdapUserSearch ldapUserSearch = new FilterBasedLdapUserSearch(ldapUserSearchBase, ldapUserSearchFilter, contextSource);
            BindAuthenticator bindAuthenticator = new BindAuthenticator(contextSource);
            bindAuthenticator.setUserSearch(ldapUserSearch);
            LdapAuthenticationProvider ldapAuthenticationProvider = new LdapAuthenticationProvider(bindAuthenticator, new DefaultLdapAuthoritiesPopulator(contextSource, ldapGroupSearchBase));
            return ldapAuthenticationProvider;
        }
    }

I have suffered for days before getting to this point Other wise you can use custom authentication and make the like this

    @Component
public class CustomAuthenticationProvider implements AuthenticationProvider {

    private Logger log = Logger.getLogger(CustomAuthenticationProvider.class);

    @Override
    public Authentication authenticate(Authentication authentication) 
      throws AuthenticationException {

        String email = authentication.getName();
        String password = authentication.getCredentials().toString();

        log.info("email : " + email);
        log.info("password : " + password);

        try {
            if (authenticate(email, password)) {

                // use the credentials
                // and authenticate against the third-party system
                return new UsernamePasswordAuthenticationToken(
                        email, password, new ArrayList<>());
            } else {
                return null;
            }
        } catch (NamingException ex) {
            log.info(ex);
        }
        return null;
    }

    boolean isLdapRegistred(String username, String password) {
    boolean result = false;
    try {

        Hashtable<String, String> env = new Hashtable<String, String>();
        env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");
        env.put(Context.PROVIDER_URL, "ldap://10.x.x.x:389");           
        env.put(Context.SECURITY_AUTHENTICATION, "simple");         
        env.put(Context.SECURITY_PRINCIPAL, "OUR-DOMAIN\\" + username);
        env.put(Context.SECURITY_CREDENTIALS, password);

        // Create the initial context
        DirContext ctx = new InitialDirContext(env);
        result = ctx != null;
        if (ctx != null)
        ctx.close();
        System.out.println(result);
        return result;
    } catch (Exception e) {
        System.out.println("oops");
        return result;
    }

}


    @Override
    public boolean supports(Class<?> authentication) {
        return authentication.equals(
          UsernamePasswordAuthenticationToken.class);
    }
}

and on another class

    @Configuration
@EnableWebSecurity
public class WebSecurityConfiguration extends WebSecurityConfigurerAdapter {

    private Logger log = Logger.getLogger(WebSecurityConfiguration.class);
    @Autowired
    private CustomAuthenticationProvider authProvider;

    @Override
    protected void configure(
      AuthenticationManagerBuilder auth) throws Exception {

        auth.authenticationProvider(authProvider);
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.authorizeRequests().anyRequest().authenticated()
            .and()
            .httpBasic();
    }
}

Then the magic happens