Spring security - @PreAuthorize not working

Question

I am facing an issue in using the @PreAuthorize annotation. Even if my user does not own the asked roles, my secured methods are executed.

My controller

Answer 1

TLDR: @EnableAspectJAutoProxy(proxyTargetClass = true) on WebConfig can be used instead.

The root of the problem may be that Spring doesn't generate controller's proxy classes - by default Spring wraps into proxies only those beans which are defined as interface and Spring IoC find their implementation. If your controllers are classes which don't implement/extend anything, CGLIB proxying has to be used (I recommend reading about Spring Proxying mechanisms), so proxy classes are generated and injected as controllers implementation - that's the place where Spring included an extra logic to respect @PreAuthorize and @PostAuthorize annotations conditions.

On Spring v5 (not Spring Boot), when @EnableGlobalMethodSecurity(prePostEnabled = true) is used on SecurityConfiguration only, it won't be picked up by WebConfig. Moving it to WebConfig will enable handling pre post annotations by Spring Security as well as it will switch on CGLIB proxy mechanism.

Personally, I recommend just adding @EnableAspectJAutoProxy(proxyTargetClass = true) on WebConfig and leaving @EnableGlobalMethodSecurity in SecurityConfig.

I have tested it on Spring v5 only, but due to documentation it should work the same on Spring v4.