What is the best way to handle Invalid CSRF token found in the request when session times out in Spring security

18.5.1 Timeouts

One issue is that the expected CSRF token is stored in the HttpSession, so as soon as the HttpSession expires your configured AccessDeniedHandler will receive a InvalidCsrfTokenException. If you are using the default AccessDeniedHandler, the browser will get an HTTP 403 and display a poor error message.

One might ask why the expected CsrfToken isn’t stored in a cookie by default. This is because there are known exploits in which headers (i.e. specify the cookies) can be set by another domain. This is the same reason Ruby on Rails no longer skips CSRF checks when the header X-Requested-With is present. See this webappsec.org thread for details on how to perform the exploit. Another disadvantage is that by removing the state (i.e. the timeout) you lose the ability to forcibly terminate the token if it is compromised.

A simple way to mitigate an active user experiencing a timeout is to have some JavaScript that lets the user know their session is about to expire. The user can click a button to continue and refresh the session.

Alternatively, specifying a custom AccessDeniedHandler allows you to process the InvalidCsrfTokenException any way you like. For an example of how to customize the AccessDeniedHandler refer to the provided links for both xml and Java configuration.

Finally, the application can be configured to use CookieCsrfTokenRepository which will not expire. As previously mentioned, this is not as secure as using a session, but in many cases can be good enough.

https://docs.spring.io/spring-security/site/docs/4.2.3.RELEASE/reference/htmlsingle/#csrf-timeouts

What is the best way to handle Invalid CSRF token found in the request when session times out in Spring security

The easiest way I found to handle invalidate CSRF token when session times out at the login page is one of the followings:

1. Redirect the request again to the login page again vi CustomAccessDeniedHandler:

   static class CustomAccessDeniedHandler extends AccessDeniedHandlerImpl{
   
       @Override
       public void handle(HttpServletRequest request,
               HttpServletResponse response,
   
     AccessDeniedException accessDeniedException)
       throws IOException, ServletException {
   if (accessDeniedException instanceof MissingCsrfTokenException
           || accessDeniedException instanceof InvalidCsrfTokenException) {
   
       if(request.getRequestURI().contains("login")){
           response.sendRedirect(request.getContextPath()+"/login");
       }
   }
   
   super.handle(request, response, accessDeniedException);
   
    }
   }

2. Add refresh header as Neil McGuigan suggested:

<meta http-equiv="refresh" content="${pageContext.session.maxInactiveInterval}">

1. Furthermore you must create a bean for the new CustomAccessDeniedHandler and register it. The following example shows this for Java config.

In any config class:

@Bean
public AccessDeniedHandler accessDeniedHandler() {
    return new CustomAccessDeniedHandler();
}

In your security config modify the configure method as follows:

@Override
protected void configure(final HttpSecurity http) throws Exception {
    http
      // ...
      .and()
      .exceptionHandling().accessDeniedHandler(accessDeniedHandler());
}

Also see here.

a more Optimum solution will be for Spring security to handle this situation in their framework.

https://stackoverflow.com/questions/32446903/what-is-the-best-way-to-handle-invalid-csrf-token-found-in-the-request-when-sess

未找到预期的CSRF令牌。您的会话已过期403
https://gxnotes.com/article/245164.html

Spring Security – Customize the 403 Forbidden/Access Denied Page
http://www.baeldung.com/spring-security-custom-access-denied-page