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			692 lines
		
	
	
		
			24 KiB
		
	
	
	
		
			Plaintext
		
	
	
	
	
	
[[servlet-saml2login-logout]]
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= Performing Single Logout
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Among its xref:servlet/authentication/logout.adoc[other logout mechanisms], Spring Security ships with support for RP- and AP-initiated SAML 2.0 Single Logout.
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Briefly, there are two use cases Spring Security supports:
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* **RP-Initiated** - Your application has an endpoint that, when POSTed to, will logout the user and send a `saml2:LogoutRequest` to the asserting party.
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Thereafter, the asserting party will send back a `saml2:LogoutResponse` and allow your application to respond
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* **AP-Initiated** - Your application has an endpoint that will receive a `saml2:LogoutRequest` from the asserting party.
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Your application will complete its logout at that point and then send a `saml2:LogoutResponse` to the asserting party.
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[NOTE]
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In the **AP-Initiated** scenario, any local redirection that your application would do post-logout is rendered moot.
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Once your application sends a `saml2:LogoutResponse`, it no longer has control of the browser.
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== Minimal Configuration for Single Logout
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To use Spring Security's SAML 2.0 Single Logout feature, you will need the following things:
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* First, the asserting party must support SAML 2.0 Single Logout
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* Second, the asserting party should be configured to sign and POST `saml2:LogoutRequest` s and `saml2:LogoutResponse` s your application's `/logout/saml2/slo` endpoint
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* Third, your application must have a PKCS#8 private key and X.509 certificate for signing `saml2:LogoutRequest` s and `saml2:LogoutResponse` s
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You can achieve this in Spring Boot in the following way:
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[source,yaml]
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----
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spring:
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  security:
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    saml2:
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      relyingparty:
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        registration:
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          metadata:
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            signing.credentials: <3>
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              - private-key-location: classpath:credentials/rp-private.key
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                certificate-location: classpath:credentials/rp-certificate.crt
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            singlelogout.url: "{baseUrl}/logout/saml2/slo" <2>
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            assertingparty:
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              metadata-uri: https://ap.example.com/metadata <1>
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----
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<1> - The metadata URI of the IDP, which will indicate to your application its support of SLO
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<2> - The SLO endpoint in your application
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<3> - The signing credentials to sign ``<saml2:LogoutRequest>``s and ``<saml2:LogoutResponse>``s
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[NOTE]
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----
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An asserting party supports Single Logout if their metadata includes the `<SingleLogoutService>` element in their metadata.
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----
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And that's it!
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Spring Security's logout support offers a number of configuration points.
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Consider the following use cases:
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* Understand how the above <<_startup_expectations, minimal configuration works>>
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* Get a picture of <<architecture, the overall architecture>>
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* Allow users to <<separating-local-saml2-logout, logout out of the app only>>
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* Customize <<_configuring_logout_endpoints, logout endpoints>>
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* Storing `<saml2:LogoutRequests>` somewhere <<_customizing_storage, other than the session>>
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=== Startup Expectations
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When these properties are used, in addition to login, SAML 2.0 Service Provider will automatically configure itself facilitate logout by way of ``<saml2:LogoutRequest>``s and ``<saml2:LogoutResponse>``s using either RP- or AP-initiated logout.
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It achieves this through a deterministic startup process:
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1. Query the Identity Server Metadata endpoint for the `<SingleLogoutService>` element
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2. Scan the metadata and cache any public signature verification keys
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3. Prepare the appropriate endpoints
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A consequence of this process is that the identity server must be up and receiving requests in order for Service Provider to successfully start up.
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[NOTE]
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If the identity server is down when Service Provider queries it (given appropriate timeouts), then startup will fail.
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=== Runtime Expectations
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Given the above configuration any logged-in user can send a `POST /logout` to your application to perform RP-initiated SLO.
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Your application will then do the following:
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1. Logout the user and invalidate the session
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2. Produce a `<saml2:LogoutRequest>` and POST it to the associated asserting party's SLO endpoint
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3. Then, if the asserting party responds with a `<saml2:LogoutResponse>`, the application with verify it and redirect to the configured success endpoint
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Also, your application can participate in an AP-initiated logout when the asserting party sends a `<saml2:LogoutRequest>` to `/logout/saml2/slo`.
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When this happens, your application will do the following:
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1. Verify the `<saml2:LogoutRequest>`
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2. Logout the user and invalidate the session
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3. Produce a `<saml2:LogoutResponse>` and POST it back to the asserting party's SLO endpoint
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== Minimal Configuration Sans Boot
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Instead of Boot properties, you can also achieve the same outcome by publishing the beans directly like so:
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[tabs]
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======
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Java::
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+
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[source,java,role="primary"]
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----
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@Configuration
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public class SecurityConfig {
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    @Value("${private.key}") RSAPrivateKey key;
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    @Value("${public.certificate}") X509Certificate certificate;
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    @Bean
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    RelyingPartyRegistrationRepository registrations() {
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        Saml2X509Credential credential = Saml2X509Credential.signing(key, certificate);
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        RelyingPartyRegistration registration = RelyingPartyRegistrations
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                .fromMetadataLocation("https://ap.example.org/metadata") <1>
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                .registrationId("metadata")
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                .singleLogoutServiceLocation("{baseUrl}/logout/saml2/slo") <2>
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                .signingX509Credentials((signing) -> signing.add(credential)) <3>
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                .build();
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        return new InMemoryRelyingPartyRegistrationRepository(registration);
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    }
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    @Bean
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    SecurityFilterChain web(HttpSecurity http) throws Exception {
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        http
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            .authorizeHttpRequests((authorize) -> authorize
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                .anyRequest().authenticated()
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            )
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            .saml2Login(withDefaults())
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            .saml2Logout(withDefaults()); <4>
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        return http.build();
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    }
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}
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----
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Kotlin::
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+
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[source,kotlin,role="secondary"]
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----
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@Configuration
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class SecurityConfig(@Value("${private.key}") val key: RSAPrivateKey,
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        @Value("${public.certificate}") val certificate: X509Certificate) {
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    @Bean
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    fun registrations(): RelyingPartyRegistrationRepository {
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        val credential = Saml2X509Credential.signing(key, certificate)
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        val registration = RelyingPartyRegistrations
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                .fromMetadataLocation("https://ap.example.org/metadata") <1>
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                .registrationId("metadata")
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                .singleLogoutServiceLocation("{baseUrl}/logout/saml2/slo") <2>
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                .signingX509Credentials({ signing: List<Saml2X509Credential> -> signing.add(credential) }) <3>
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                .build()
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        return InMemoryRelyingPartyRegistrationRepository(registration)
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    }
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    @Bean
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    fun web(http: HttpSecurity): SecurityFilterChain {
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        http {
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            authorizeHttpRequests {
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                anyRequest = authenticated
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            }
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            saml2Login {
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            }
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            saml2Logout { <4>
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            }
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        }
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        return http.build()
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    }
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}
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----
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======
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<1> - The metadata URI of the IDP, which will indicate to your application its support of SLO
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<2> - The SLO endpoint in your application
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<3> - The signing credentials to sign ``<saml2:LogoutRequest>``s and ``<saml2:LogoutResponse>``s, which you can also add to xref:servlet/saml2/login/overview.adoc#servlet-saml2login-rpr-duplicated[multiple relying parties]
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<4> - Second, indicate that your application wants to use SAML SLO to logout the end user
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[NOTE]
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Adding `saml2Logout` adds the capability for logout to your service provider as a whole.
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Because it is an optional capability, you need to enable it for each individual `RelyingPartyRegistration`.
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You do this by setting the `RelyingPartyRegistration.Builder#singleLogoutServiceLocation` property as seen above.
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[[architecture]]
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== How Saml 2.0 Logout Works
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Next, let's see the architectural components that Spring Security uses to support https://docs.oasis-open.org/security/saml/v2.0/saml-profiles-2.0-os.pdf#page=37[SAML 2.0 Logout] in servlet-based applications, like the one we just saw.
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For RP-initiated logout:
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image:{icondir}/number_1.png[] Spring Security executes its xref:servlet/authentication/logout.adoc#logout-architecture[logout flow], calling its ``LogoutHandler``s to invalidate the session and perform other cleanup.
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It then invokes the {security-api-url}org/springframework/security/saml2/provider/service/web/authentication/logout/Saml2RelyingPartyInitiatedLogoutSuccessHandler.html[`Saml2RelyingPartyInitiatedLogoutSuccessHandler`].
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image:{icondir}/number_2.png[] The logout success handler uses an instance of
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{security-api-url}org/springframework/security/saml2/provider/service/web/authentication/logout/Saml2LogoutRequestResolver.html[`Saml2LogoutRequestResolver`] to create, sign, and serialize a `<saml2:LogoutRequest>`.
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It uses the keys and configuration from the xref:servlet/saml2/login/overview.adoc#servlet-saml2login-relyingpartyregistration[`RelyingPartyRegistration`] that is associated with the current `Saml2AuthenticatedPrincipal`.
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Then, it redirect-POSTs the `<saml2:LogoutRequest>` to the asserting party SLO endpoint
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The browser hands control over to the asserting party.
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If the asserting party redirects back (which it may not), then the application proceeds to step image:{icondir}/number_3.png[].
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image:{icondir}/number_3.png[] The {security-api-url}org/springframework/security/saml2/provider/service/web/authentication/logout/Saml2LogoutResponseFilter.html[`Saml2LogoutResponseFilter`] deserializes, verifies, and processes the `<saml2:LogoutResponse>` with its {security-api-url}org/springframework/security/saml2/provider/service/authentication/logout/Saml2LogoutResponseValidator.html[`Saml2LogoutResponseValidator`].
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image:{icondir}/number_4.png[] If valid, then it completes the local logout flow by redirecting to `/login?logout`, or whatever has been configured.
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If invalid, then it responds with a 400.
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For AP-initiated logout:
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image:{icondir}/number_1.png[] The {security-api-url}org/springframework/security/saml2/provider/service/web/authentication/logout/Saml2LogoutRequestFilter.html[`Saml2LogoutRequestFilter`] deserializes, verifies, and processes the `<saml2:LogoutRequest>` with its {security-api-url}org/springframework/security/saml2/provider/service/authentication/logout/Saml2LogoutRequestValidator.html[`Saml2LogoutRequestValidator`].
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image:{icondir}/number_2.png[] If valid, then the filter calls the configured ``LogoutHandler``s, invalidating the session and performing other cleanup.
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image:{icondir}/number_3.png[] It uses a {security-api-url}org/springframework/security/saml2/provider/service/web/authentication/logout/Saml2LogoutResponseResolver.html[`Saml2LogoutResponseResolver`] to create, sign and serialize a `<saml2:LogoutResponse>`.
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It uses the keys and configuration from the xref:servlet/saml2/login/overview.adoc#servlet-saml2login-relyingpartyregistration[`RelyingPartyRegistration`] derived from the endpoint or from the contents of the `<saml2:LogoutRequest>`.
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Then, it redirect-POSTs the `<saml2:LogoutResponse>` to the asserting party SLO endpoint.
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The browser hands control over to the asserting party.
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image:{icondir}/number_4.png[] If invalid, then it https://github.com/spring-projects/spring-security/pull/14676[responds with a 400].
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== Configuring Logout Endpoints
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There are three behaviors that can be triggered by different endpoints:
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* RP-initiated logout, which allows an authenticated user to `POST` and trigger the logout process by sending the asserting party a `<saml2:LogoutRequest>`
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* AP-initiated logout, which allows an asserting party to send a `<saml2:LogoutRequest>` to the application
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* AP logout response, which allows an asserting party to send a `<saml2:LogoutResponse>` in response to the RP-initiated `<saml2:LogoutRequest>`
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The first is triggered by performing normal `POST /logout` when the principal is of type `Saml2AuthenticatedPrincipal`.
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The second is triggered by POSTing to the `/logout/saml2/slo` endpoint with a `SAMLRequest` signed by the asserting party.
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The third is triggered by POSTing to the `/logout/saml2/slo` endpoint with a `SAMLResponse` signed by the asserting party.
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Because the user is already logged in or the original Logout Request is known, the `registrationId` is already known.
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For this reason, `+{registrationId}+` is not part of these URLs by default.
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This URL is customizable in the DSL.
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For example, if you are migrating your existing relying party over to Spring Security, your asserting party may already be pointing to `GET /SLOService.saml2`.
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To reduce changes in configuration for the asserting party, you can configure the filter in the DSL like so:
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[tabs]
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======
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Java::
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+
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[source,java,role="primary"]
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----
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http
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    .saml2Logout((saml2) -> saml2
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        .logoutRequest((request) -> request.logoutUrl("/SLOService.saml2"))
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        .logoutResponse((response) -> response.logoutUrl("/SLOService.saml2"))
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    );
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----
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Kotlin::
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+
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[source,kotlin,role="secondary"]
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----
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http {
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    saml2Logout {
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        logoutRequest {
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            logoutUrl = "/SLOService.saml2"
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        }
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        logoutResponse {
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            logoutUrl = "/SLOService.saml2"
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        }
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    }
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}
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----
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======
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You should also configure these endpoints in your `RelyingPartyRegistration`.
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Also, you can customize the endpoint for triggering logout locally like so:
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[tabs]
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======
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Java::
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+
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[source,java,role="primary"]
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----
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http
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    .saml2Logout((saml2) -> saml2.logoutUrl("/saml2/logout"));
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----
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Kotlin::
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+
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[source,kotlin,role="secondary"]
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----
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http {
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    saml2Logout {
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        logoutUrl = "/saml2/logout"
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    }
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}
 | 
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----
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======
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[[separating-local-saml2-logout]]
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=== Separating Local Logout from SAML 2.0 Logout
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In some cases, you may want to expose one logout endpoint for local logout and another for RP-initiated SLO.
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Like is the case with other logout mechanisms, you can register more than one, so long as they each have a different endpoint.
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So, for example, you can wire the DSL like so:
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 | 
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[tabs]
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======
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Java::
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+
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[source,java,role="primary"]
 | 
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----
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http
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    .logout((logout) -> logout.logoutUrl("/logout"))
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    .saml2Logout((saml2) -> saml2.logoutUrl("/saml2/logout"));
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----
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Kotlin::
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+
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[source,kotlin,role="secondary"]
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----
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http {
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    logout {
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        logoutUrl = "/logout"
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    }
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    saml2Logout {
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        logoutUrl = "/saml2/logout"
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    }
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}
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						|
----
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======
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and now if a client sends a `POST /logout`, the session will be cleared, but there won't be a `<saml2:LogoutRequest>` sent to the asserting party.
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But, if the client sends a `POST /saml2/logout`, then the application will initiate SAML 2.0 SLO as normal.
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== Customizing `<saml2:LogoutRequest>` Resolution
 | 
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 | 
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It's common to need to set other values in the `<saml2:LogoutRequest>` than the defaults that Spring Security provides.
 | 
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 | 
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By default, Spring Security will issue a `<saml2:LogoutRequest>` and supply:
 | 
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 | 
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* The `Destination` attribute - from `RelyingPartyRegistration#getAssertingPartyDetails#getSingleLogoutServiceLocation`
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* The `ID` attribute - a GUID
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						|
* The `<Issuer>` element - from `RelyingPartyRegistration#getEntityId`
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						|
* The `<NameID>` element - from `Authentication#getName`
 | 
						|
 | 
						|
To add other values, you can use delegation, like so:
 | 
						|
 | 
						|
[tabs]
 | 
						|
======
 | 
						|
Java::
 | 
						|
+
 | 
						|
[source,java,role="primary"]
 | 
						|
----
 | 
						|
@Bean
 | 
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Saml2LogoutRequestResolver logoutRequestResolver(RelyingPartyRegistrationRepository registrations) {
 | 
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	OpenSaml4LogoutRequestResolver logoutRequestResolver =
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			new OpenSaml4LogoutRequestResolver(registrations);
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						|
	logoutRequestResolver.setParametersConsumer((parameters) -> {
 | 
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		String name = ((Saml2AuthenticatedPrincipal) parameters.getAuthentication().getPrincipal()).getFirstAttribute("CustomAttribute");
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						|
		String format = "urn:oasis:names:tc:SAML:2.0:nameid-format:transient";
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		LogoutRequest logoutRequest = parameters.getLogoutRequest();
 | 
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		NameID nameId = logoutRequest.getNameID();
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		nameId.setValue(name);
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		nameId.setFormat(format);
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	});
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	return logoutRequestResolver;
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						|
}
 | 
						|
----
 | 
						|
 | 
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Kotlin::
 | 
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+
 | 
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[source,kotlin,role="secondary"]
 | 
						|
----
 | 
						|
@Bean
 | 
						|
open fun logoutRequestResolver(registrations:RelyingPartyRegistrationRepository?): Saml2LogoutRequestResolver {
 | 
						|
    val logoutRequestResolver = OpenSaml4LogoutRequestResolver(registrations)
 | 
						|
    logoutRequestResolver.setParametersConsumer { parameters: LogoutRequestParameters ->
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						|
        val name: String = (parameters.getAuthentication().getPrincipal() as Saml2AuthenticatedPrincipal).getFirstAttribute("CustomAttribute")
 | 
						|
        val format = "urn:oasis:names:tc:SAML:2.0:nameid-format:transient"
 | 
						|
        val logoutRequest: LogoutRequest = parameters.getLogoutRequest()
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						|
        val nameId: NameID = logoutRequest.getNameID()
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						|
        nameId.setValue(name)
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						|
        nameId.setFormat(format)
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						|
    }
 | 
						|
    return logoutRequestResolver
 | 
						|
}
 | 
						|
----
 | 
						|
======
 | 
						|
 | 
						|
Then, you can supply your custom `Saml2LogoutRequestResolver` in the DSL as follows:
 | 
						|
 | 
						|
[tabs]
 | 
						|
======
 | 
						|
Java::
 | 
						|
+
 | 
						|
[source,java,role="primary"]
 | 
						|
----
 | 
						|
http
 | 
						|
    .saml2Logout((saml2) -> saml2
 | 
						|
        .logoutRequest((request) -> request
 | 
						|
            .logoutRequestResolver(this.logoutRequestResolver)
 | 
						|
        )
 | 
						|
    );
 | 
						|
----
 | 
						|
 | 
						|
Kotlin::
 | 
						|
+
 | 
						|
[source,kotlin,role="secondary"]
 | 
						|
----
 | 
						|
http {
 | 
						|
    saml2Logout {
 | 
						|
        logoutRequest {
 | 
						|
            logoutRequestResolver = this.logoutRequestResolver
 | 
						|
        }
 | 
						|
    }
 | 
						|
}
 | 
						|
----
 | 
						|
======
 | 
						|
 | 
						|
== Customizing `<saml2:LogoutResponse>` Resolution
 | 
						|
 | 
						|
It's common to need to set other values in the `<saml2:LogoutResponse>` than the defaults that Spring Security provides.
 | 
						|
 | 
						|
By default, Spring Security will issue a `<saml2:LogoutResponse>` and supply:
 | 
						|
 | 
						|
* The `Destination` attribute - from `RelyingPartyRegistration#getAssertingPartyDetails#getSingleLogoutServiceResponseLocation`
 | 
						|
* The `ID` attribute - a GUID
 | 
						|
* The `<Issuer>` element - from `RelyingPartyRegistration#getEntityId`
 | 
						|
* The `<Status>` element - `SUCCESS`
 | 
						|
 | 
						|
To add other values, you can use delegation, like so:
 | 
						|
 | 
						|
[tabs]
 | 
						|
======
 | 
						|
Java::
 | 
						|
+
 | 
						|
[source,java,role="primary"]
 | 
						|
----
 | 
						|
@Bean
 | 
						|
public Saml2LogoutResponseResolver logoutResponseResolver(RelyingPartyRegistrationRepository registrations) {
 | 
						|
	OpenSaml4LogoutResponseResolver logoutRequestResolver =
 | 
						|
			new OpenSaml4LogoutResponseResolver(registrations);
 | 
						|
	logoutRequestResolver.setParametersConsumer((parameters) -> {
 | 
						|
		if (checkOtherPrevailingConditions(parameters.getRequest())) {
 | 
						|
			parameters.getLogoutRequest().getStatus().getStatusCode().setCode(StatusCode.PARTIAL_LOGOUT);
 | 
						|
		}
 | 
						|
	});
 | 
						|
	return logoutRequestResolver;
 | 
						|
}
 | 
						|
----
 | 
						|
 | 
						|
Kotlin::
 | 
						|
+
 | 
						|
[source,kotlin,role="secondary"]
 | 
						|
----
 | 
						|
@Bean
 | 
						|
open fun logoutResponseResolver(registrations: RelyingPartyRegistrationRepository?): Saml2LogoutResponseResolver {
 | 
						|
    val logoutRequestResolver = OpenSaml4LogoutResponseResolver(registrations)
 | 
						|
    logoutRequestResolver.setParametersConsumer { LogoutResponseParameters parameters ->
 | 
						|
        if (checkOtherPrevailingConditions(parameters.getRequest())) {
 | 
						|
            parameters.getLogoutRequest().getStatus().getStatusCode().setCode(StatusCode.PARTIAL_LOGOUT)
 | 
						|
        }
 | 
						|
    }
 | 
						|
    return logoutRequestResolver
 | 
						|
}
 | 
						|
----
 | 
						|
======
 | 
						|
 | 
						|
Then, you can supply your custom `Saml2LogoutResponseResolver` in the DSL as follows:
 | 
						|
 | 
						|
[tabs]
 | 
						|
======
 | 
						|
Java::
 | 
						|
+
 | 
						|
[source,java,role="primary"]
 | 
						|
----
 | 
						|
http
 | 
						|
    .saml2Logout((saml2) -> saml2
 | 
						|
        .logoutRequest((request) -> request
 | 
						|
            .logoutRequestResolver(this.logoutRequestResolver)
 | 
						|
        )
 | 
						|
    );
 | 
						|
----
 | 
						|
 | 
						|
Kotlin::
 | 
						|
+
 | 
						|
[source,kotlin,role="secondary"]
 | 
						|
----
 | 
						|
http {
 | 
						|
    saml2Logout {
 | 
						|
        logoutRequest {
 | 
						|
            logoutRequestResolver = this.logoutRequestResolver
 | 
						|
        }
 | 
						|
    }
 | 
						|
}
 | 
						|
----
 | 
						|
======
 | 
						|
 | 
						|
== Customizing `<saml2:LogoutRequest>` Authentication
 | 
						|
 | 
						|
To customize validation, you can implement your own `Saml2LogoutRequestValidator`.
 | 
						|
At this point, the validation is minimal, so you may be able to first delegate to the default `Saml2LogoutRequestValidator` like so:
 | 
						|
 | 
						|
[tabs]
 | 
						|
======
 | 
						|
Java::
 | 
						|
+
 | 
						|
[source,java,role="primary"]
 | 
						|
----
 | 
						|
@Component
 | 
						|
public class MyOpenSamlLogoutRequestValidator implements Saml2LogoutRequestValidator {
 | 
						|
	private final Saml2LogoutRequestValidator delegate = new OpenSamlLogoutRequestValidator();
 | 
						|
 | 
						|
	@Override
 | 
						|
    public Saml2LogoutRequestValidator logout(Saml2LogoutRequestValidatorParameters parameters) {
 | 
						|
		 // verify signature, issuer, destination, and principal name
 | 
						|
		Saml2LogoutValidatorResult result = delegate.authenticate(authentication);
 | 
						|
 | 
						|
		LogoutRequest logoutRequest = // ... parse using OpenSAML
 | 
						|
        // perform custom validation
 | 
						|
    }
 | 
						|
}
 | 
						|
----
 | 
						|
 | 
						|
Kotlin::
 | 
						|
+
 | 
						|
[source,kotlin,role="secondary"]
 | 
						|
----
 | 
						|
@Component
 | 
						|
open class MyOpenSamlLogoutRequestValidator: Saml2LogoutRequestValidator {
 | 
						|
	private val delegate = OpenSamlLogoutRequestValidator()
 | 
						|
 | 
						|
	@Override
 | 
						|
    fun logout(parameters: Saml2LogoutRequestValidatorParameters): Saml2LogoutRequestValidator {
 | 
						|
		 // verify signature, issuer, destination, and principal name
 | 
						|
		val result = delegate.authenticate(authentication)
 | 
						|
 | 
						|
		val logoutRequest: LogoutRequest = // ... parse using OpenSAML
 | 
						|
        // perform custom validation
 | 
						|
    }
 | 
						|
}
 | 
						|
----
 | 
						|
======
 | 
						|
 | 
						|
Then, you can supply your custom `Saml2LogoutRequestValidator` in the DSL as follows:
 | 
						|
 | 
						|
[tabs]
 | 
						|
======
 | 
						|
Java::
 | 
						|
+
 | 
						|
[source,java,role="primary"]
 | 
						|
----
 | 
						|
http
 | 
						|
    .saml2Logout((saml2) -> saml2
 | 
						|
        .logoutRequest((request) -> request
 | 
						|
            .logoutRequestValidator(myOpenSamlLogoutRequestValidator)
 | 
						|
        )
 | 
						|
    );
 | 
						|
----
 | 
						|
 | 
						|
Kotlin::
 | 
						|
+
 | 
						|
[source,kotlin,role="secondary"]
 | 
						|
----
 | 
						|
http {
 | 
						|
    saml2Logout {
 | 
						|
        logoutRequest {
 | 
						|
            logoutRequestValidator = myOpenSamlLogoutRequestValidator
 | 
						|
        }
 | 
						|
    }
 | 
						|
}
 | 
						|
----
 | 
						|
======
 | 
						|
 | 
						|
== Customizing `<saml2:LogoutResponse>` Authentication
 | 
						|
 | 
						|
To customize validation, you can implement your own `Saml2LogoutResponseValidator`.
 | 
						|
At this point, the validation is minimal, so you may be able to first delegate to the default `Saml2LogoutResponseValidator` like so:
 | 
						|
 | 
						|
[tabs]
 | 
						|
======
 | 
						|
Java::
 | 
						|
+
 | 
						|
[source,java,role="primary"]
 | 
						|
----
 | 
						|
@Component
 | 
						|
public class MyOpenSamlLogoutResponseValidator implements Saml2LogoutResponseValidator {
 | 
						|
	private final Saml2LogoutResponseValidator delegate = new OpenSamlLogoutResponseValidator();
 | 
						|
 | 
						|
	@Override
 | 
						|
    public Saml2LogoutValidatorResult logout(Saml2LogoutResponseValidatorParameters parameters) {
 | 
						|
		// verify signature, issuer, destination, and status
 | 
						|
		Saml2LogoutValidatorResult result = delegate.authenticate(parameters);
 | 
						|
 | 
						|
		LogoutResponse logoutResponse = // ... parse using OpenSAML
 | 
						|
        // perform custom validation
 | 
						|
    }
 | 
						|
}
 | 
						|
----
 | 
						|
 | 
						|
Kotlin::
 | 
						|
+
 | 
						|
[source,kotlin,role="secondary"]
 | 
						|
----
 | 
						|
@Component
 | 
						|
open class MyOpenSamlLogoutResponseValidator: Saml2LogoutResponseValidator {
 | 
						|
	private val delegate = OpenSamlLogoutResponseValidator()
 | 
						|
 | 
						|
	@Override
 | 
						|
    fun logout(parameters: Saml2LogoutResponseValidatorParameters): Saml2LogoutResponseValidator {
 | 
						|
		// verify signature, issuer, destination, and status
 | 
						|
		val result = delegate.authenticate(authentication)
 | 
						|
 | 
						|
		val logoutResponse: LogoutResponse = // ... parse using OpenSAML
 | 
						|
        // perform custom validation
 | 
						|
    }
 | 
						|
}
 | 
						|
----
 | 
						|
======
 | 
						|
 | 
						|
Then, you can supply your custom `Saml2LogoutResponseValidator` in the DSL as follows:
 | 
						|
 | 
						|
[tabs]
 | 
						|
======
 | 
						|
Java::
 | 
						|
+
 | 
						|
[source,java,role="primary"]
 | 
						|
----
 | 
						|
http
 | 
						|
    .saml2Logout((saml2) -> saml2
 | 
						|
        .logoutResponse((response) -> response
 | 
						|
            .logoutResponseAuthenticator(myOpenSamlLogoutResponseAuthenticator)
 | 
						|
        )
 | 
						|
    );
 | 
						|
----
 | 
						|
 | 
						|
Kotlin::
 | 
						|
+
 | 
						|
[source,kotlin,role="secondary"]
 | 
						|
----
 | 
						|
http {
 | 
						|
    saml2Logout {
 | 
						|
        logoutResponse {
 | 
						|
            logoutResponseValidator = myOpenSamlLogoutResponseValidator
 | 
						|
        }
 | 
						|
    }
 | 
						|
}
 | 
						|
----
 | 
						|
======
 | 
						|
 | 
						|
== Customizing `<saml2:LogoutRequest>` storage
 | 
						|
 | 
						|
When your application sends a `<saml2:LogoutRequest>`, the value is stored in the session so that the `RelayState` parameter and the `InResponseTo` attribute in the `<saml2:LogoutResponse>` can be verified.
 | 
						|
 | 
						|
If you want to store logout requests in some place other than the session, you can supply your custom implementation in the DSL, like so:
 | 
						|
 | 
						|
[tabs]
 | 
						|
======
 | 
						|
Java::
 | 
						|
+
 | 
						|
[source,java,role="primary"]
 | 
						|
----
 | 
						|
http
 | 
						|
    .saml2Logout((saml2) -> saml2
 | 
						|
        .logoutRequest((request) -> request
 | 
						|
            .logoutRequestRepository(myCustomLogoutRequestRepository)
 | 
						|
        )
 | 
						|
    );
 | 
						|
----
 | 
						|
 | 
						|
Kotlin::
 | 
						|
+
 | 
						|
[source,kotlin,role="secondary"]
 | 
						|
----
 | 
						|
http {
 | 
						|
    saml2Logout {
 | 
						|
        logoutRequest {
 | 
						|
            logoutRequestRepository = myCustomLogoutRequestRepository
 | 
						|
        }
 | 
						|
    }
 | 
						|
}
 | 
						|
----
 | 
						|
======
 | 
						|
 | 
						|
[[jc-logout-references]]
 | 
						|
== Further Logout-Related References
 | 
						|
 | 
						|
- xref:servlet/test/mockmvc/logout.adoc#test-logout[Testing Logout]
 | 
						|
- xref:servlet/integrations/servlet-api.adoc#servletapi-logout[HttpServletRequest.logout()]
 | 
						|
- xref:servlet/exploits/csrf.adoc#csrf-considerations-logout[Logging Out] in section CSRF Caveats
 |