Migrate samples to spring-security 6.x about spring-security-kerberos HOT 2 CLOSED

    @Bean
    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
	ProviderManager providerManager = new ProviderManager(kerberosAuthenticationProvider(),
		kerberosServiceAuthenticationProvider());

	http
	  .authorizeHttpRequests((authz) -> authz
		  // do not authenticate clients on the /info endpoint
		  .requestMatchers("/info").permitAll()
		  // always permit /error endpoint (default redirect for rendering error messages)
		  .requestMatchers("/error").permitAll()
		  // require authentication without role constraint on any other endpoint
		  .anyRequest().authenticated())
	  
	  // disabling cross site request forgery filter to allow POST requests
	  .csrf((csrf) -> csrf.disable())
	  
	  // exception handling for Kerberos negotiate challenge to the client
	  .exceptionHandling(((exceptions) -> exceptions
		  .authenticationEntryPoint(spnegoEntryPoint())))
	  
	  // add Kerberos authenticator knowing the expected users
	  .authenticationProvider(kerberosAuthenticationProvider())
	  
	  // add validator of Kerberos service tickets
	  .authenticationProvider(kerberosServiceAuthenticationProvider())
	  
	  // add filter which processes the "Authorization: Negotiate" header sent by the client
	  // containing the service ticket
	  .addFilterBefore(
		  spnegoAuthenticationProcessingFilter(providerManager),
		  BasicAuthenticationFilter.class);
	return http.build();
    }