#oauth2 security expressions on method level

Question

What should I do to be able to use #oauth2 security expressions on method level like on the example below?

@RequestMapping(value = "email", method = RequestMethod.GET)
  @ResponseBody
  @PreAuthorize("#oauth2.hasScope('read')")
  public String email() {

    return "[email protected]";
  }

If I do a request to that resource I receive

    [INFO] java.lang.IllegalArgumentException: Failed to evaluate expression '#oauth2.hasScope('read')'
[INFO]  at org.springframework.security.access.expression.ExpressionUtils.evaluateAsBoolean(ExpressionUtils.java:14)
[INFO]  at org.springframework.security.access.expression.method.ExpressionBasedPreInvocationAdvice.before(ExpressionBasedPreInvocationAdvice.java:44)
[INFO]  at org.springframework.security.access.prepost.PreInvocationAuthorizationAdviceVoter.vote(PreInvocationAuthorizationAdviceVoter.java:57)
[INFO]  at org.springframework.security.access.prepost.PreInvocationAuthorizationAdviceVoter.vote(PreInvocationAuthorizationAdviceVoter.java:25)
[INFO]  at org.springframework.security.access.vote.AffirmativeBased.decide(AffirmativeBased.java:62)
[INFO]  at org.springframework.security.access.intercept.AbstractSecurityInterceptor.beforeInvocation(AbstractSecurityInterceptor.java:232)
[INFO]  at org.springframework.security.access.intercept.aspectj.AspectJMethodSecurityInterceptor.invoke(AspectJMethodSecurityInterceptor.java:43)
[INFO]  at org.springframework.security.access.intercept.aspectj.aspect.AnnotationSecurityAspect.ajc$around$org_springframework_security_access_intercept_aspectj_aspect_AnnotationSecurityAspect$1$c4d57a2b(AnnotationSecurityAspect.aj:63)
[INFO]  at pl.insert.controllers.ResourceController.email(ResourceController.java:22)

The same thing works well if I specify the access in my ResourceServerConfiguration instead of @Controllers' methods

@Configuration
@EnableResourceServer
public class ResourceServerConfiguration extends ResourceServerConfigurerAdapter {

  @Override
  public void configure(HttpSecurity http) throws Exception {
    http.requestMatchers().antMatchers("/oauth/resources/**");
    http.authorizeRequests().anyRequest().access("#oauth2.hasScope('read')");
  }
}

Standard security expressions like @PreAuthorize("permitAll") or @PreAuthorize("denyAll") work as expected. So, probably I have to tell somehow to my AspectJMethodSecurityInterceptor to use OAuth2WebSecurityExpressionHandler. Any ideas?

Answer 1

To enable #oAuth2 security expressions it is only needed to set default expression handler as OAuth2MethodSecurityExpressionHandler instead of DefaultMethodSecurityExpressionHandler. Because OAuth2MethodSecurityExpressionHandler extends it anyway then the whole previous functionality remains the same. I my configuration I use both GlobalMethodSecurityConfiguration and WebSecurityConfigurerAdapter.

@Configuration
@EnableGlobalMethodSecurity
public class MethodSecurityConfiguration extends GlobalMethodSecurityConfiguration {

  @Override
  protected MethodSecurityExpressionHandler createExpressionHandler() {
    return new OAuth2MethodSecurityExpressionHandler();
  }
}

@Configuration
@EnableWebSecurity
public class SecurityConfiguration extends WebSecurityConfigurerAdapter {
  ...
}


@Configuration
@Import({ SecurityConfiguration.class, MethodSecurityConfiguration.class })
public class AppConfiguration {
  ...
}

Answer 2

I think you also need to add: @EnableGlobalMethodSecurity(prePostEnabled = true) in order to get it to work.

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