This version is still in development and is not considered stable yet. For the latest stable version, please use Spring Security 6.3.2! |
EnableReactiveMethodSecurity
Spring Security supports method security by using Reactor’s Context, which is set up by ReactiveSecurityContextHolder
.
The following example shows how to retrieve the currently logged in user’s message:
For this example to work, the return type of the method must be a |
EnableReactiveMethodSecurity with AuthorizationManager
In Spring Security 5.8, we can enable annotation-based security using the @EnableReactiveMethodSecurity(useAuthorizationManager=true)
annotation on any @Configuration
instance.
This improves upon @EnableReactiveMethodSecurity
in a number of ways. @EnableReactiveMethodSecurity(useAuthorizationManager=true)
:
-
Uses the simplified
AuthorizationManager
API instead of metadata sources, config attributes, decision managers, and voters. This simplifies reuse and customization. -
Supports reactive return types including Kotlin coroutines.
-
Is built using native Spring AOP, removing abstractions and allowing you to use Spring AOP building blocks to customize
-
Checks for conflicting annotations to ensure an unambiguous security configuration
-
Complies with JSR-250
For earlier versions, please read about similar support with @EnableReactiveMethodSecurity. |
For example, the following would enable Spring Security’s @PreAuthorize
annotation:
-
Java
@EnableReactiveMethodSecurity(useAuthorizationManager=true)
public class MethodSecurityConfig {
// ...
}
Adding an annotation to a method (on a class or interface) would then limit the access to that method accordingly.
Spring Security’s native annotation support defines a set of attributes for the method.
These will be passed to the various method interceptors, like AuthorizationManagerBeforeReactiveMethodInterceptor
, for it to make the actual decision:
-
Java
public interface BankService {
@PreAuthorize("hasRole('USER')")
Mono<Account> readAccount(Long id);
@PreAuthorize("hasRole('USER')")
Flux<Account> findAccounts();
@PreAuthorize("@func.apply(#account)")
Mono<Account> post(Account account, Double amount);
}
In this case hasRole
refers to the method found in SecurityExpressionRoot
that gets invoked by the SpEL evaluation engine.
@bean
refers to a custom component you have defined, where apply
can return Boolean
or Mono<Boolean>
to indicate the authorization decision.
A bean like that might look something like this:
-
Java
@Bean
public Function<Account, Mono<Boolean>> func() {
return (account) -> Mono.defer(() -> Mono.just(account.getId().equals(12)));
}
Customizing Authorization
Spring Security’s @PreAuthorize
, @PostAuthorize
, @PreFilter
, and @PostFilter
ship with rich expression-based support.
-
Java
@Bean
@Role(BeanDefinition.ROLE_INFRASTRUCTURE)
static GrantedAuthorityDefaults grantedAuthorityDefaults() {
return new GrantedAuthorityDefaults("MYPREFIX_");
}
We expose |
Custom Authorization Managers
Method authorization is a combination of before- and after-method authorization.
Before-method authorization is performed before the method is invoked.
If that authorization denies access, the method is not invoked, and an |
To recreate what adding @EnableReactiveMethodSecurity(useAuthorizationManager=true)
does by default, you would publish the following configuration:
-
Java
@Configuration
class MethodSecurityConfig {
@Bean
BeanDefinitionRegistryPostProcessor aopConfig() {
return AopConfigUtils::registerAutoProxyCreatorIfNecessary;
}
@Bean
@Role(BeanDefinition.ROLE_INFRASTRUCTURE)
PreFilterAuthorizationReactiveMethodInterceptor preFilterInterceptor() {
return new PreFilterAuthorizationReactiveMethodInterceptor();
}
@Bean
@Role(BeanDefinition.ROLE_INFRASTRUCTURE)
AuthorizationManagerBeforeReactiveMethodInterceptor preAuthorizeInterceptor() {
return AuthorizationManagerBeforeReactiveMethodInterceptor.preAuthorize();
}
@Bean
@Role(BeanDefinition.ROLE_INFRASTRUCTURE)
AuthorizationManagerAfterReactiveMethodInterceptor postAuthorizeInterceptor() {
return AuthorizationManagerAfterReactiveMethodInterceptor.postAuthorize();
}
@Bean
@Role(BeanDefinition.ROLE_INFRASTRUCTURE)
PostFilterAuthorizationReactiveMethodInterceptor postFilterInterceptor() {
return new PostFilterAuthorizationReactiveMethodInterceptor();
}
}
Notice that Spring Security’s method security is built using Spring AOP.
So, interceptors are invoked based on the order specified.
This can be customized by calling setOrder
on the interceptor instances like so:
-
Java
@Bean
@Role(BeanDefinition.ROLE_INFRASTRUCTURE)
Advisor postFilterAuthorizationMethodInterceptor() {
PostFilterAuthorizationMethodInterceptor interceptor = new PostFilterAuthorizationReactiveMethodInterceptor();
interceptor.setOrder(AuthorizationInterceptorOrders.POST_AUTHORIZE.getOrder() - 1);
return interceptor;
}
You may want to only support @PreAuthorize
in your application, in which case you can do the following:
-
Java
@Configuration
class MethodSecurityConfig {
@Bean
BeanDefinitionRegistryPostProcessor aopConfig() {
return AopConfigUtils::registerAutoProxyCreatorIfNecessary;
}
@Bean
@Role(BeanDefinition.ROLE_INFRASTRUCTURE)
Advisor preAuthorize() {
return AuthorizationManagerBeforeMethodInterceptor.preAuthorize();
}
}
Or, you may have a custom before-method ReactiveAuthorizationManager
that you want to add to the list.
In this case, you will need to tell Spring Security both the ReactiveAuthorizationManager
and to which methods and classes your authorization manager applies.
Thus, you can configure Spring Security to invoke your ReactiveAuthorizationManager
in between @PreAuthorize
and @PostAuthorize
like so:
-
Java
@EnableReactiveMethodSecurity(useAuthorizationManager=true)
class MethodSecurityConfig {
@Bean
@Role(BeanDefinition.ROLE_INFRASTRUCTURE)
public Advisor customAuthorize() {
JdkRegexpMethodPointcut pattern = new JdkRegexpMethodPointcut();
pattern.setPattern("org.mycompany.myapp.service.*");
ReactiveAuthorizationManager<MethodInvocation> rule = AuthorityAuthorizationManager.isAuthenticated();
AuthorizationManagerBeforeReactiveMethodInterceptor interceptor = new AuthorizationManagerBeforeReactiveMethodInterceptor(pattern, rule);
interceptor.setOrder(AuthorizationInterceptorsOrder.PRE_AUTHORIZE_ADVISOR_ORDER.getOrder() + 1);
return interceptor;
}
}
You can place your interceptor in between Spring Security method interceptors using the order constants specified in |
The same can be done for after-method authorization. After-method authorization is generally concerned with analysing the return value to verify access.
For example, you might have a method that confirms that the account requested actually belongs to the logged-in user like so:
-
Java
public interface BankService {
@PreAuthorize("hasRole('USER')")
@PostAuthorize("returnObject.owner == authentication.name")
Mono<Account> readAccount(Long id);
}
You can supply your own AuthorizationMethodInterceptor
to customize how access to the return value is evaluated.
For example, if you have your own custom annotation, you can configure it like so:
-
Java
@EnableReactiveMethodSecurity(useAuthorizationManager=true)
class MethodSecurityConfig {
@Bean
@Role(BeanDefinition.ROLE_INFRASTRUCTURE)
public Advisor customAuthorize(ReactiveAuthorizationManager<MethodInvocationResult> rules) {
AnnotationMethodMatcher pattern = new AnnotationMethodMatcher(MySecurityAnnotation.class);
AuthorizationManagerAfterReactiveMethodInterceptor interceptor = new AuthorizationManagerAfterReactiveMethodInterceptor(pattern, rules);
interceptor.setOrder(AuthorizationInterceptorsOrder.POST_AUTHORIZE_ADVISOR_ORDER.getOrder() + 1);
return interceptor;
}
}
and it will be invoked after the @PostAuthorize
interceptor.
EnableReactiveMethodSecurity
-
Java
-
Kotlin
Authentication authentication = new TestingAuthenticationToken("user", "password", "ROLE_USER");
Mono<String> messageByUsername = ReactiveSecurityContextHolder.getContext()
.map(SecurityContext::getAuthentication)
.map(Authentication::getName)
.flatMap(this::findMessageByUsername)
// In a WebFlux application the `subscriberContext` is automatically setup using `ReactorContextWebFilter`
.contextWrite(ReactiveSecurityContextHolder.withAuthentication(authentication));
StepVerifier.create(messageByUsername)
.expectNext("Hi user")
.verifyComplete();
val authentication: Authentication = TestingAuthenticationToken("user", "password", "ROLE_USER")
val messageByUsername: Mono<String> = ReactiveSecurityContextHolder.getContext()
.map(SecurityContext::getAuthentication)
.map(Authentication::getName)
.flatMap(this::findMessageByUsername) // In a WebFlux application the `subscriberContext` is automatically setup using `ReactorContextWebFilter`
.contextWrite(ReactiveSecurityContextHolder.withAuthentication(authentication))
StepVerifier.create(messageByUsername)
.expectNext("Hi user")
.verifyComplete()
Where this::findMessageByUsername
is defined as:
-
Java
-
Kotlin
Mono<String> findMessageByUsername(String username) {
return Mono.just("Hi " + username);
}
fun findMessageByUsername(username: String): Mono<String> {
return Mono.just("Hi $username")
}
The following minimal method security configures method security in reactive applications:
-
Java
-
Kotlin
@Configuration
@EnableReactiveMethodSecurity
public class SecurityConfig {
@Bean
public MapReactiveUserDetailsService userDetailsService() {
User.UserBuilder userBuilder = User.withDefaultPasswordEncoder();
UserDetails rob = userBuilder.username("rob")
.password("rob")
.roles("USER")
.build();
UserDetails admin = userBuilder.username("admin")
.password("admin")
.roles("USER","ADMIN")
.build();
return new MapReactiveUserDetailsService(rob, admin);
}
}
@Configuration
@EnableReactiveMethodSecurity
class SecurityConfig {
@Bean
fun userDetailsService(): MapReactiveUserDetailsService {
val userBuilder: User.UserBuilder = User.withDefaultPasswordEncoder()
val rob = userBuilder.username("rob")
.password("rob")
.roles("USER")
.build()
val admin = userBuilder.username("admin")
.password("admin")
.roles("USER", "ADMIN")
.build()
return MapReactiveUserDetailsService(rob, admin)
}
}
Consider the following class:
-
Java
-
Kotlin
@Component
public class HelloWorldMessageService {
@PreAuthorize("hasRole('ADMIN')")
public Mono<String> findMessage() {
return Mono.just("Hello World!");
}
}
@Component
class HelloWorldMessageService {
@PreAuthorize("hasRole('ADMIN')")
fun findMessage(): Mono<String> {
return Mono.just("Hello World!")
}
}
Alternatively, the following class uses Kotlin coroutines:
-
Kotlin
@Component
class HelloWorldMessageService {
@PreAuthorize("hasRole('ADMIN')")
suspend fun findMessage(): String {
delay(10)
return "Hello World!"
}
}
Combined with our configuration above, @PreAuthorize("hasRole('ADMIN')")
ensures that findByMessage
is invoked only by a user with the ADMIN
role.
Note that any of the expressions in standard method security work for @EnableReactiveMethodSecurity
.
However, at this time, we support only a return type of Boolean
or boolean
of the expression.
This means that the expression must not block.
When integrating with WebFlux Security, the Reactor Context is automatically established by Spring Security according to the authenticated user:
-
Java
-
Kotlin
@Configuration
@EnableWebFluxSecurity
@EnableReactiveMethodSecurity
public class SecurityConfig {
@Bean
SecurityWebFilterChain springWebFilterChain(ServerHttpSecurity http) throws Exception {
return http
// Demonstrate that method security works
// Best practice to use both for defense in depth
.authorizeExchange(exchanges -> exchanges
.anyExchange().permitAll()
)
.httpBasic(withDefaults())
.build();
}
@Bean
MapReactiveUserDetailsService userDetailsService() {
User.UserBuilder userBuilder = User.withDefaultPasswordEncoder();
UserDetails rob = userBuilder.username("rob")
.password("rob")
.roles("USER")
.build();
UserDetails admin = userBuilder.username("admin")
.password("admin")
.roles("USER","ADMIN")
.build();
return new MapReactiveUserDetailsService(rob, admin);
}
}
@Configuration
@EnableWebFluxSecurity
@EnableReactiveMethodSecurity
class SecurityConfig {
@Bean
open fun springWebFilterChain(http: ServerHttpSecurity): SecurityWebFilterChain {
return http {
authorizeExchange {
authorize(anyExchange, permitAll)
}
httpBasic { }
}
}
@Bean
fun userDetailsService(): MapReactiveUserDetailsService {
val userBuilder: User.UserBuilder = User.withDefaultPasswordEncoder()
val rob = userBuilder.username("rob")
.password("rob")
.roles("USER")
.build()
val admin = userBuilder.username("admin")
.password("admin")
.roles("USER", "ADMIN")
.build()
return MapReactiveUserDetailsService(rob, admin)
}
}
You can find a complete sample in hellowebflux-method.