How to configure Spring Security to allow Swagger URL to be accessed without authentication

Question

My project has Spring Security. Main issue: Not able to access swagger URL at http://localhost:8080/api/v2/api-docs. It says Missing or invalid Authorization header.

Screenshot of the browser window My pom.xml has the following entries

<dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-swagger2</artifactId>
    <version>2.4.0</version>
</dependency>

<dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-swagger-ui</artifactId>
    <version>2.4.0</version>
</dependency>

SwaggerConfig :

@Configuration
@EnableSwagger2
public class SwaggerConfig {

@Bean
public Docket api() {
    return new Docket(DocumentationType.SWAGGER_2).select()
            .apis(RequestHandlerSelectors.any())
            .paths(PathSelectors.any())
            .build()
            .apiInfo(apiInfo());
}

private ApiInfo apiInfo() {
    ApiInfo apiInfo = new ApiInfo("My REST API", "Some custom description of API.", "API TOS", "Terms of service", "[email protected]", "License of API", "API license URL");
    return apiInfo;
}

AppConfig:

@Configuration
@EnableWebMvc
@ComponentScan(basePackages = { "com.musigma.esp2" })
@Import(SwaggerConfig.class)
public class AppConfig extends WebMvcConfigurerAdapter {

// ========= Overrides ===========

@Override
public void addInterceptors(InterceptorRegistry registry) {
    registry.addInterceptor(new LocaleChangeInterceptor());
}

@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
    registry.addResourceHandler("swagger-ui.html")
      .addResourceLocations("classpath:/META-INF/resources/");

    registry.addResourceHandler("/webjars/**")
      .addResourceLocations("classpath:/META-INF/resources/webjars/");
}

web.xml entries:

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>
        com.musigma.esp2.configuration.AppConfig
        com.musigma.esp2.configuration.WebSecurityConfiguration
        com.musigma.esp2.configuration.PersistenceConfig
        com.musigma.esp2.configuration.ACLConfig
        com.musigma.esp2.configuration.SwaggerConfig
    </param-value>
</context-param>

WebSecurityConfig:

@Configuration
@EnableWebSecurity
@EnableGlobalMethodSecurity(prePostEnabled = true)
@ComponentScan(basePackages = { "com.musigma.esp2.service", "com.musigma.esp2.security" })
public class WebSecurityConfiguration extends WebSecurityConfigurerAdapter {
@Override
    protected void configure(HttpSecurity httpSecurity) throws Exception {
        httpSecurity
        .csrf()
            .disable()
        .exceptionHandling()
            .authenticationEntryPoint(this.unauthorizedHandler)
            .and()
        .sessionManagement()
            .sessionCreationPolicy(SessionCreationPolicy.STATELESS)
            .and()
        .authorizeRequests()
            .antMatchers("/auth/login", "/auth/logout").permitAll()
            .antMatchers("/api/**").authenticated()
            .anyRequest().authenticated();

        // custom JSON based authentication by POST of {"username":"<name>","password":"<password>"} which sets the token header upon authentication
        httpSecurity.addFilterBefore(loginFilter(), UsernamePasswordAuthenticationFilter.class);

        // custom Token based authentication based on the header previously given to the client
        httpSecurity.addFilterBefore(new StatelessTokenAuthenticationFilter(tokenAuthenticationService), UsernamePasswordAuthenticationFilter.class);
    }
}

Answer 1

Adding this to your WebSecurityConfiguration class should do the trick.

@Configuration
public class WebSecurityConfiguration extends WebSecurityConfigurerAdapter {

    @Override
    public void configure(WebSecurity web) throws Exception {
        web.ignoring().antMatchers("/v2/api-docs",
                                   "/configuration/ui",
                                   "/swagger-resources/**",
                                   "/configuration/security",
                                   "/swagger-ui.html",
                                   "/webjars/**");
    }

}