WebSecurityConfig.java

package demo.app;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.config.annotation.web.servlet.configuration.EnableWebMvcSecurity;
import org.springframework.security.kerberos.authentication.KerberosAuthenticationProvider;
import org.springframework.security.kerberos.authentication.sun.SunJaasKerberosClient;

import demo.DummyUserDetailsService;

@Configuration
@EnableWebMvcSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {

	@Override
	protected void configure(HttpSecurity http) throws Exception {
		http
			.authorizeRequests()
				.antMatchers("/", "/home").permitAll()
				.anyRequest().authenticated()
				.and()
			.formLogin()
				.loginPage("/login").permitAll()
				.and()
			.logout()
				.permitAll();
	}

	@Override
	protected void configure(AuthenticationManagerBuilder auth) throws Exception {
		auth
			.authenticationProvider(kerberosAuthenticationProvider());
	}

	@Bean
	public KerberosAuthenticationProvider kerberosAuthenticationProvider() {
		KerberosAuthenticationProvider provider = new KerberosAuthenticationProvider();
		SunJaasKerberosClient client = new SunJaasKerberosClient();
		client.setDebug(true);
		provider.setKerberosClient(client);
		provider.setUserDetailsService(dummyUserDetailsService());
		return provider;
	}

	@Bean
	public DummyUserDetailsService dummyUserDetailsService() {
		return new DummyUserDetailsService();
	}

}