[[new]]
= What's New in Spring Security 6.4

Spring Security 6.4 provides a number of new features.
Below are the highlights of the release, or you can view https://github.com/spring-projects/spring-security/releases[the release notes] for a detailed listing of each feature and bug fix.

== Method Security

* All xref:servlet/authorization/method-security.adoc#using_metannotation-method-interceptors[method security annotations] now support {spring-framework-api-url}org/springframework/core/annotation/AliasFor.html[Framework's `@AliasFor`]
* `@AuthenticationPrincipal` and `@CurrentSecurityContext` now support xref:servlet/authorization/method-security.adoc#_templating_meta_annotation_expressions[annotation templates].
+
This means that you can now use Spring's meta-annotation support like so:
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[tabs]
======
Java::
+
[source,java,role="primary"]
----
@Target(TargetType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@AuthenticationPrincipal("claims['{claim}']")
@interface CurrentUsername {
	String claim() default "sub";
}

// ...

@GetMapping
public String method(@CurrentUsername("username") String username) {
	// ...
}
----

Kotlin::
+
[source,kotlin,role="secondary"]
----
annotation CurrentUsername(val claim: String = "sub")

// ...

@GetMapping
fun method(@CurrentUsername("username") val username: String): String {
	// ...
}
----
======
* https://github.com/spring-projects/spring-security/issues/13490[Several] https://github.com/spring-projects/spring-security/issues/13234[improvements] https://github.com/spring-projects/spring-security/issues/15097[were made] to align Security's annotation search with ``AbstractFallbackMethodSecurityMetadataSource``'s algorithm.
This aids in migration from earlier versions of Spring Security.

== OAuth 2.0

* `oauth2Login()` now accepts https://github.com/spring-projects/spring-security/pull/15237[`OAuth2AuthorizationRequestResolver` as a `@Bean`]
* OIDC Back-Channel support now accepts https://github.com/spring-projects/spring-security/issues/15003[logout tokens of type `logout+jwt`]
* `RestClient` can now be xref:servlet/oauth2/index.adoc#oauth2-client-access-protected-resources[configured] with `OAuth2ClientHttpRequestInterceptor` to xref:servlet/oauth2/index.adoc#oauth2-client-accessing-protected-resources-example[make protected resources requests]

== SAML 2.0

* Added xref:servlet/saml2/opensaml.adoc[OpenSAML 5 Support].
Now you can use either OpenSAML 4 or OpenSAML 5; by default, Spring Security will select the write implementations based on what's on your classpath.
* Using EntityIDs for the `registrationId` is simplified.
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A common pattern is to identify asserting parties by their `entityID`.
In previous versions, this required directly configuring `OpenSamlAuthenticationRequestResolver`.
Now, the request resolver looks by default for the `registrationId` https://github.com/spring-projects/spring-security/issues/15017[as a request parameter] in addition to looking for it in the path.
This allows you to use `RelyingPartyRegistrations` or `OpenSaml4/5AssertingPartyMetadataRepository` without also needing to modify the `registrationId` values or customize the request resolver.
+
Relatedly, you can now configure your `authenticationRequestUri` to xref:servlet/saml2/login/authentication-requests.adoc#configuring-authentication-request-uri[contain a query parameter]
* Asserting Parties can now be refreshed in the background according to the metadata's expiry.
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For example, you can now use xref:servlet/saml2/metadata.adoc#using-assertingpartymetadatarepository[`OpenSaml5AssertingPartyMetadataRepository`] to do:
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[tabs]
======
Java::
+
[source,java,role="primary"]
----
@Component
public class RefreshableRelyingPartyRegistrationRepository implements IterableRelyingPartyRegistrationRepository {
	private final AssertingPartyMetadataRepository assertingParties = OpenSaml5AssertingPartyMetadataRepository
		.fromTrustedMetadataLocation("https://idp.example.org").build();

	@Override
	public RelyingPartyRegistration findByRegistrationId(String registrationId) {
		AssertingPartyMetadata assertingParty = this.assertingParties.findByEntityId(registrationId);
		return RelyingPartyRegistration.withAssertingPartyMetadata(assertingParty)
			// relying party configurations
			.build();
	}

	// ...
}
----

Kotlin::
+
[source,kotlin,role="secondary"]
----
@Component
open class RefreshableRelyingPartyRegistrationRepository: IterableRelyingPartyRegistrationRepository {
	private val assertingParties: AssertingPartyMetadataRepository = OpenSaml5AssertingPartyMetadataRepository
		.fromTrustedMetadataLocation("https://idp.example.org").build()

	override fun findByRegistrationId(String registrationId): RelyingPartyRegistration {
		val assertingParty = this.assertingParties.findByEntityId(registrationId)
		return RelyingPartyRegistration.withAssertingPartyMetadata(assertingParty)
			// relying party configurations
			.build()
	}

	// ...
}
----
======
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This implementation also supports the validation of a metadata's signature.
* You can now sign https://github.com/spring-projects/spring-security/pull/14916[relying party metadata]
* `RelyingPartyRegistrationRepository` results can now be javadoc:org.springframework.security.saml2.provider.service.registration.CachingRelyingPartyRegistrationRepository[cached].
This is helpful if you want to defer the loading of the registration values til after application startup.
It is also helpful if you want to control when metadata gets refreshed.
* To align with the SAML 2.0 standard, the metadata endpoint now https://github.com/spring-projects/spring-security/issues/15147[uses the `application/samlmetadata+xml` MIME type]

== Web

* CSRF BREACH tokens are now https://github.com/spring-projects/spring-security/issues/15187[more consistent]
* The Remember Me cookie now is https://github.com/spring-projects/spring-security/pull/15203[more customizable]
* Security Filter Chain is now improved.
Specifically, the following arrangement is invalid since an any request filter chain comes before all other filter chains:
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[tabs]
======
Java::
+
[source,java,role="primary"]
----
@Bean 
@Order(0)
SecurityFilterChain api(HttpSecurity http) throws Exception {
    http
        .authorizeHttpRequests(...)
        .httpBasic(...)

    return http.build();
}

@Bean 
@Order(1)
SecurityFilterChain app(HttpSecurity http) throws Exception {
    http
        .securityMatcher("/app/**")
        .authorizeHttpRequests(...)
        .formLogin(...)

    return http.build();
}
----

Kotlin::
+
[source,kotlin,role="secondary"]
----
@Bean 
@Order(0)
fun api(val http: HttpSecurity): SecurityFilterChain {
    http {
		authorizeHttpRequests {
			// ...
		}
	}
    return http.build();
}

@Bean 
@Order(1)
fun app(val http: HttpSecurity): SecurityFilterChain {
    http {
		securityMatcher("/app/**")
		authorizeHttpRequests {
			// ...
		}
	}
    return http.build();
}
----
======
You can read more https://github.com/spring-projects/spring-security/issues/15220[in the related ticket].

== One-Time Token Login

Spring Security now xref:servlet/authentication/onetimetoken.adoc[supports One-Time Token Login] via the `oneTimeTokenLogin()` DSL.

== Kotlin

* The Kotlin DSL now supports https://github.com/spring-projects/spring-security/issues/14935[SAML 2.0] and https://github.com/spring-projects/spring-security/issues/15171[`GrantedAuthorityDefaults`] and https://github.com/spring-projects/spring-security/issues/15136[`RoleHierarchy`] ``@Bean``s
* `@PreFilter` and `@PostFilter` are https://github.com/spring-projects/spring-security/pull/15095[now supported] in Kotlin
* The Kotlin Reactive DSL now supports https://github.com/spring-projects/spring-security/pull/15013[`SecurityContextRepository`]

== Acl

* `AclAuthorizationStrategyImpl` now https://github.com/spring-projects/spring-security/issues/4186[supports `RoleHierarchy`]
