Apply SAML2 sign-request even if metadata url is set

Closes gh-33747

Author: mhalbritter

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/saml2/Saml2RelyingPartyRegistrationConfiguration.java

@@ -91,10 +91,10 @@ private RelyingPartyRegistration asRegistration(String id, Registration properti
 		AssertingPartyProperties assertingParty = new AssertingPartyProperties(properties, id);
 		boolean usingMetadata = StringUtils.hasText(assertingParty.getMetadataUri());
 		Builder builder = (!usingMetadata) ? RelyingPartyRegistration.withRegistrationId(id)
-				: createBuilderUsingMetadata(id, assertingParty).registrationId(id);
+				: createBuilderUsingMetadata(assertingParty).registrationId(id);
 		builder.assertionConsumerServiceLocation(properties.getAcs().getLocation());
 		builder.assertionConsumerServiceBinding(properties.getAcs().getBinding());
-		builder.assertingPartyDetails(mapAssertingParty(properties, id, usingMetadata));
+		builder.assertingPartyDetails(mapAssertingParty(properties, id));
 		builder.signingX509Credentials((credentials) -> properties.getSigning()
 			.getCredentials()
 			.stream()
@@ -120,8 +120,7 @@ private RelyingPartyRegistration asRegistration(String id, Registration properti
 		return registration;
 	}
 
-	private RelyingPartyRegistration.Builder createBuilderUsingMetadata(String id,
-			AssertingPartyProperties properties) {
+	private RelyingPartyRegistration.Builder createBuilderUsingMetadata(AssertingPartyProperties properties) {
 		String requiredEntityId = properties.getEntityId();
 		Collection<Builder> candidates = RelyingPartyRegistrations
 			.collectionFromMetadataLocation(properties.getMetadataUri());
@@ -139,17 +138,14 @@ private Object getEntityId(RelyingPartyRegistration.Builder candidate) {
 		return result[0];
 	}
 
-	private Consumer<AssertingPartyDetails.Builder> mapAssertingParty(Registration registration, String id,
-			boolean usingMetadata) {
+	private Consumer<AssertingPartyDetails.Builder> mapAssertingParty(Registration registration, String id) {
 		return (details) -> {
 			AssertingPartyProperties assertingParty = new AssertingPartyProperties(registration, id);
 			PropertyMapper map = PropertyMapper.get().alwaysApplyingWhenNonNull();
 			map.from(assertingParty::getEntityId).to(details::entityId);
 			map.from(assertingParty::getSingleSignonBinding).to(details::singleSignOnServiceBinding);
 			map.from(assertingParty::getSingleSignonUrl).to(details::singleSignOnServiceLocation);
-			map.from(assertingParty::getSingleSignonSignRequest)
-				.when((ignored) -> !usingMetadata)
-				.to(details::wantAuthnRequestsSigned);
+			map.from(assertingParty::getSingleSignonSignRequest).to(details::wantAuthnRequestsSigned);
 			map.from(assertingParty.getSinglelogoutUrl()).to(details::singleLogoutServiceLocation);
 			map.from(assertingParty.getSinglelogoutResponseUrl()).to(details::singleLogoutServiceResponseLocation);
 			map.from(assertingParty.getSinglelogoutBinding()).to(details::singleLogoutServiceBinding);

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/security/saml2/Saml2RelyingPartyAutoConfigurationTests.java

@@ -16,7 +16,6 @@
 
 package org.springframework.boot.autoconfigure.security.saml2;
 
-import java.io.IOException;
 import java.io.InputStream;
 import java.util.List;
 
@@ -416,7 +415,26 @@ void autoconfigurationWhenMultipleProvidersAndSpecifiedEntityId() throws Excepti
 		testMultipleProviders("https://idp2.example.com/idp/shibboleth", "https://idp2.example.com/idp/shibboleth");
 	}
 
-	private void testMultipleProviders(String specifiedEntityId, String expected) throws IOException, Exception {
+	@Test
+	void signRequestShouldApplyIfMetadataUriIsSet() throws Exception {
+		try (MockWebServer server = new MockWebServer()) {
+			server.start();
+			String metadataUrl = server.url("").toString();
+			setupMockResponse(server, new ClassPathResource("saml/idp-metadata"));
+			this.contextRunner.withPropertyValues(PREFIX + ".foo.assertingparty.metadata-uri=" + metadataUrl,
+					PREFIX + ".foo.assertingparty.singlesignon.sign-request=true",
+					PREFIX + ".foo.signing.credentials[0].private-key-location=classpath:org/springframework/boot/autoconfigure/security/saml2/rsa.key",
+					PREFIX + ".foo.signing.credentials[0].certificate-location=classpath:org/springframework/boot/autoconfigure/security/saml2/rsa.crt")
+				.run((context) -> {
+					RelyingPartyRegistrationRepository repository = context
+						.getBean(RelyingPartyRegistrationRepository.class);
+					RelyingPartyRegistration registration = repository.findByRegistrationId("foo");
+					assertThat(registration.getAssertingPartyDetails().getWantAuthnRequestsSigned()).isTrue();
+				});
+		}
+	}
+
+	private void testMultipleProviders(String specifiedEntityId, String expected) throws Exception {
 		try (MockWebServer server = new MockWebServer()) {
 			server.start();
 			String metadataUrl = server.url("").toString();

spring-boot-project/spring-boot-autoconfigure/src/test/resources/org/springframework/boot/autoconfigure/security/saml2/rsa.crt

@@ -0,0 +1,23 @@
+-----BEGIN CERTIFICATE-----
+MIID1zCCAr+gAwIBAgIUCzQeKBMTO0iHVW3iKmZC41haqCowDQYJKoZIhvcNAQEL
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+-----END CERTIFICATE-----

spring-boot-project/spring-boot-autoconfigure/src/test/resources/org/springframework/boot/autoconfigure/security/saml2/rsa.key

@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----
+MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQDUfi4aaCotJZX6
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+VYriYasPwmzS2y2P7PKFzJs=
+-----END PRIVATE KEY-----