Make management security configuration back off when SAML present

Fixes gh-21620

spring-boot-project/spring-boot-actuator-autoconfigure/pom.xml

@@ -622,6 +622,11 @@
 			<artifactId>spring-security-oauth2-jose</artifactId>
 			<scope>test</scope>
 		</dependency>
+		<dependency>
+			<groupId>org.springframework.security</groupId>
+			<artifactId>spring-security-saml2-service-provider</artifactId>
+			<scope>test</scope>
+		</dependency>
 		<dependency>
 			<groupId>org.yaml</groupId>
 			<artifactId>snakeyaml</artifactId>

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/security/servlet/ManagementWebSecurityAutoConfiguration.java

@@ -27,6 +27,7 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean
 import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
 import org.springframework.boot.autoconfigure.security.oauth2.client.servlet.OAuth2ClientAutoConfiguration;
 import org.springframework.boot.autoconfigure.security.oauth2.resource.servlet.OAuth2ResourceServerAutoConfiguration;
+import org.springframework.boot.autoconfigure.security.saml2.Saml2RelyingPartyAutoConfiguration;
 import org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration;
 import org.springframework.boot.autoconfigure.security.servlet.WebSecurityEnablerConfiguration;
 import org.springframework.context.annotation.Configuration;
@@ -48,7 +49,7 @@ import org.springframework.security.config.annotation.web.configuration.WebSecur
 @AutoConfigureBefore(SecurityAutoConfiguration.class)
 @AutoConfigureAfter({ HealthEndpointAutoConfiguration.class, InfoEndpointAutoConfiguration.class,
 		WebEndpointAutoConfiguration.class, OAuth2ClientAutoConfiguration.class,
-		OAuth2ResourceServerAutoConfiguration.class })
+		OAuth2ResourceServerAutoConfiguration.class, Saml2RelyingPartyAutoConfiguration.class })
 @Import({ ManagementWebSecurityConfigurerAdapter.class, WebSecurityEnablerConfiguration.class })
 public class ManagementWebSecurityAutoConfiguration {
 

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/security/servlet/ManagementWebSecurityAutoConfigurationTests.java

@@ -28,6 +28,7 @@ import org.springframework.boot.actuate.autoconfigure.health.HealthEndpointAutoC
 import org.springframework.boot.actuate.autoconfigure.info.InfoEndpointAutoConfiguration;
 import org.springframework.boot.autoconfigure.AutoConfigurations;
 import org.springframework.boot.autoconfigure.security.oauth2.resource.servlet.OAuth2ResourceServerAutoConfiguration;
+import org.springframework.boot.autoconfigure.security.saml2.Saml2RelyingPartyAutoConfiguration;
 import org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration;
 import org.springframework.boot.test.context.assertj.AssertableWebApplicationContext;
 import org.springframework.boot.test.context.runner.WebApplicationContextRunner;
@@ -109,6 +110,16 @@ class ManagementWebSecurityAutoConfigurationTests {
 				.run((context) -> assertThat(context).doesNotHaveBean(ManagementWebSecurityConfigurerAdapter.class));
 	}
 
+	@Test
+	void backOffIfSaml2RelyingPartyAutoConfigurationPresent() {
+		this.contextRunner.withConfiguration(AutoConfigurations.of(Saml2RelyingPartyAutoConfiguration.class))
+				.withPropertyValues(
+						"spring.security.saml2.relyingparty.registration.simplesamlphp.identity-provider.sso-url=https://simplesaml-for-spring-saml/SSOService.php",
+						"spring.security.saml2.relyingparty.registration.simplesamlphp.identityprovider.entity-id=https://simplesaml-for-spring-saml.cfapps.io/saml2/idp/metadata.php",
+						"spring.security.saml2.relyingparty.registration.simplesamlphp.identityprovider.verification.credentials[0].certificate-location=classpath:saml/certificate-location")
+				.run((context) -> assertThat(context).doesNotHaveBean(ManagementWebSecurityConfigurerAdapter.class));
+	}
+
 	private HttpStatus getResponseStatus(AssertableWebApplicationContext context, String path)
 			throws IOException, javax.servlet.ServletException {
 		FilterChainProxy filterChainProxy = context.getBean(FilterChainProxy.class);

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/resources/saml/certificate-location

@@ -0,0 +1,24 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----