[JAVA] Spring Boot with Spring Security Filter settings and addictive points

Setting Example

When configuring Filter in Java Configuration, it is convenient to inherit ʻorg.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter` and overwrite the two configure methods.

You can add a Filter for authentication with HttpSecurity and set WebSecurity to ignore the Filter.

SecurityConfig.java

@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {

    private static final String[] STATIC_RESOURCES = {
        "/**/css/**", "/**/js/**", "/**/img/**",
    };

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        //Add Filter to Security Filter Chain
        http.addFilter(this.preAuthenticatedProcessingFilter());
    }

    @Override
    public void configure(WebSecurity web) throws Exception {
        //Set paths to exclude from the Security Filter Chain
        web.ignoring().antMatchers(STATIC_RESOURCES);
    }

    //Filter registered in Security Filter Chain is not bean-defined
    public AbstractPreAuthenticatedProcessingFilter preAuthenticatedProcessingFilter() throws Exception {
        final SampleAuthFilter filter = new SampleAuthFilter();
        filter.setAuthenticationManager(this.authenticationManager());
        return filter;
    }
}

There are many articles and sites of other people around here, so I don't have to bother to write it, but I've been addicted to it for a while, so I'll write it.

Where I was addicted

Even if you set ignore, Filter will be applied to all requests including static resources that do not require authentication. For a few days, I found some free time and searched for "spring security ignoring not work" etc., but I couldn't find a solution due to problems such as how to write the ignore settings.

When I think about it now, the comment here on StackOverflow was exactly the solution, but I didn't realize it.

Cause and solution

The cause is that the Filter class was annotated with @Component. The same goes for adding @Bean to the Configuration class. As a result, it will be registered outside the Security Filter Chain.

The solution is, of course, not to register as a bean.

Some pages have sample code with @Bean, so I thought some people would suffer from the same problem. However, although it is unconfirmed, if you do not use Spring Boot (starter-web?), You may not get into this problem.

I got a hint from the solution to exclude from FilterRegistrationBean on StackOverFlow and managed to solve it, but I can't seem to see it just by tracing from the source of WebSecurityConfigurerAdapter. How Spring Security works in Hello World was very helpful.

If I couldn't solve it in another day, the worst way "adding an if statement on the Filter side" was flickering (laughs).

reference

Spring Security – security none, filters none, access permitAll Spring Security filter chain not ignoring specified path [duplicate] How Spring Security works in Hello World