Modify the SpringSecurityConfiguration.java file, as follows:

@EnableWebSecurity
@Configuration
@EnableGlobalMethodSecurity(securedEnabled = true)
public class SpringSecurityConfig extends WebSecurityConfigurerAdapter {
   private static final Logger LOG = 
                LoggerFactory.getLogger(SpringSecurityConfig.class);
   @Override
   protected void configure(HttpSecurity http) throws Exception {
       http.authorizeRequests()    .antMatchers("/admins").hasRole("ADMINS")
               .antMatchers("/users").hasRole("USERS")
               .anyRequest().fullyAuthenticated()
               .and()
               .httpBasic(); // Use Basic authentication
   }
   @Override
   public void configure(AuthenticationManagerBuilder auth) throws Exception {
       auth
               .ldapAuthentication()
               .userDnPatterns("uid={0},ou=people")
               .userSearchBase("ou=people")
               .userSearchFilter("uid={0}")
               .groupSearchBase("ou=groups")
               .groupSearchFilter("uniqueMember={0}")
               .contextSource(contextSource())
               .passwordCompare()
               .passwordAttribute("userPassword");
   }
   @Bean
   public DefaultSpringSecurityContextSource contextSource() {
       LOG.info("Inside configuring embedded LDAP server");
       DefaultSpringSecurityContextSource contextSource = new 
               DefaultSpringSecurityContextSource(
               Arrays.asList("ldap://localhost:8389/"), "dc=packtpub,dc=com");
       contextSource.afterPropertiesSet();
       return contextSource;
   }
}

The first configure method is very similar to what we saw in the previous SAML example. We have just added certain matches and separated the roles. With these changes, it will still perform basic authentication.

The second configure method is where we have set up authentication using the LDAP server. The LDAP server stores user information in a directory-like format. This method details how to find the user by navigating through the directory structure.