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			692 lines
		
	
	
		
			24 KiB
		
	
	
	
		
			Plaintext
		
	
	
	
	
	
| [[servlet-saml2login-logout]]
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| = Performing Single Logout
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| 
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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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| 
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| Briefly, there are two use cases Spring Security supports:
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| 
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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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| 
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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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| 
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| == Minimal Configuration for Single Logout
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| 
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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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| 
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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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| 
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| You can achieve this in Spring Boot in the following way:
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| 
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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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| ----
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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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| 
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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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| 
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| And that's it!
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| 
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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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| 
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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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| 
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| === Startup Expectations
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| 
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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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| 
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| It achieves this through a deterministic startup process:
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| 
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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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| 
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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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| 
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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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| 
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| === Runtime Expectations
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| 
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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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| 
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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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| 
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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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| 
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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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| 
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| == Minimal Configuration Sans Boot
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| 
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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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| 
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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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| 
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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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| 
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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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| 
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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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| 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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| 
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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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| 
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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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|             }
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|             saml2Logout { <4>
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| 
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|             }
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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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| 
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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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| 
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| [[architecture]]
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| == How Saml 2.0 Logout Works
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| 
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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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| 
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| For RP-initiated logout:
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| 
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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 javadoc:org.springframework.security.saml2.provider.service.web.authentication.logout.Saml2RelyingPartyInitiatedLogoutSuccessHandler[].
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| 
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| image:{icondir}/number_2.png[] The logout success handler uses an instance of
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| javadoc:org.springframework.security.saml2.provider.service.web.authentication.logout.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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| 
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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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| 
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| image:{icondir}/number_3.png[] The javadoc:org.springframework.security.saml2.provider.service.web.authentication.logout.Saml2LogoutResponseFilter[] deserializes, verifies, and processes the `<saml2:LogoutResponse>` with its javadoc:org.springframework.security.saml2.provider.service.authentication.logout.Saml2LogoutResponseValidator[].
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| 
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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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| 
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| For AP-initiated logout:
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| 
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| image:{icondir}/number_1.png[] The javadoc:org.springframework.security.saml2.provider.service.web.authentication.logout.Saml2LogoutRequestFilter[] deserializes, verifies, and processes the `<saml2:LogoutRequest>` with its javadoc:org.springframework.security.saml2.provider.service.authentication.logout.Saml2LogoutRequestValidator[].
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| 
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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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| 
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| image:{icondir}/number_3.png[] It uses a javadoc:org.springframework.security.saml2.provider.service.web.authentication.logout.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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| 
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| The browser hands control over to the asserting party.
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| 
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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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| 
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| == Configuring Logout Endpoints
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| 
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| There are three behaviors that can be triggered by different endpoints:
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| 
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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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| 
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| The first is triggered by performing normal `POST /logout` when the principal is of type `Saml2AuthenticatedPrincipal`.
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| 
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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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| 
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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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| 
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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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| 
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| This URL is customizable in the DSL.
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| 
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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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| 
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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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| 
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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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| 
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| You should also configure these endpoints in your `RelyingPartyRegistration`.
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| 
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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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| 
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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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| 
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| [[separating-local-saml2-logout]]
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| === Separating Local Logout from SAML 2.0 Logout
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| 
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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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| 
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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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| 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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| 
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| Kotlin::
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| +
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| [source,kotlin,role="secondary"]
 | |
| ----
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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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| 
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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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| * The `Destination` attribute - from `RelyingPartyRegistration#getAssertingPartyMetadata#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`
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| 
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| To add other values, you can use delegation, like so:
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| 
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| [tabs]
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| ======
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| Java::
 | |
| +
 | |
| [source,java,role="primary"]
 | |
| ----
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| @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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| ----
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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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| @Bean
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| open fun logoutRequestResolver(registrations:RelyingPartyRegistrationRepository?): Saml2LogoutRequestResolver {
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|     val logoutRequestResolver = OpenSaml4LogoutRequestResolver(registrations)
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|     logoutRequestResolver.setParametersConsumer { parameters: LogoutRequestParameters ->
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|         val name: String = (parameters.getAuthentication().getPrincipal() as Saml2AuthenticatedPrincipal).getFirstAttribute("CustomAttribute")
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|         val format = "urn:oasis:names:tc:SAML:2.0:nameid-format:transient"
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|         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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|     }
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|     return logoutRequestResolver
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| }
 | |
| ----
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| ======
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| 
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| Then, you can supply your custom `Saml2LogoutRequestResolver` in the DSL as follows:
 | |
| 
 | |
| [tabs]
 | |
| ======
 | |
| Java::
 | |
| +
 | |
| [source,java,role="primary"]
 | |
| ----
 | |
| http
 | |
|     .saml2Logout((saml2) -> saml2
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|         .logoutRequest((request) -> request
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|             .logoutRequestResolver(this.logoutRequestResolver)
 | |
|         )
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|     );
 | |
| ----
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| 
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| Kotlin::
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| +
 | |
| [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#getAssertingPartyMetadata#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);
 | |
| 		}
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| 	});
 | |
| 	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 = OpenSaml4LogoutResponseValidator()
 | |
| 
 | |
| 	@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
 |