Configure CORS in default security configuration for MVC

Fixes gh-11987

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

@@ -22,6 +22,7 @@ import org.springframework.context.annotation.Configuration;
 import org.springframework.security.config.Customizer;
 import org.springframework.security.config.annotation.web.builders.HttpSecurity;
 import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
+import org.springframework.util.ClassUtils;
 
 /**
  * The default configuration for web security when the actuator dependency is on the
@@ -44,6 +45,9 @@ class ManagementWebSecurityConfigurerAdapter extends WebSecurityConfigurerAdapte
 			requests.requestMatchers(EndpointRequest.to(HealthEndpoint.class, InfoEndpoint.class)).permitAll();
 			requests.anyRequest().authenticated();
 		});
+		if (ClassUtils.isPresent("org.springframework.web.servlet.DispatcherServlet", null)) {
+			http.cors();
+		}
 		http.formLogin(Customizer.withDefaults());
 		http.httpBasic(Customizer.withDefaults());
 	}

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/integrationtest/JerseyEndpointIntegrationTests.java

@@ -16,12 +16,17 @@
 
 package org.springframework.boot.actuate.autoconfigure.integrationtest;
 
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
 import org.glassfish.jersey.server.ResourceConfig;
 import org.junit.jupiter.api.Test;
 
 import org.springframework.boot.actuate.autoconfigure.beans.BeansEndpointAutoConfiguration;
 import org.springframework.boot.actuate.autoconfigure.endpoint.EndpointAutoConfiguration;
 import org.springframework.boot.actuate.autoconfigure.endpoint.web.WebEndpointAutoConfiguration;
+import org.springframework.boot.actuate.autoconfigure.security.servlet.ManagementWebSecurityAutoConfiguration;
 import org.springframework.boot.actuate.autoconfigure.web.server.ManagementContextAutoConfiguration;
 import org.springframework.boot.actuate.endpoint.web.annotation.ControllerEndpoint;
 import org.springframework.boot.actuate.endpoint.web.annotation.RestControllerEndpoint;
@@ -55,18 +60,23 @@ class JerseyEndpointIntegrationTests {
 		testJerseyEndpoints(new Class[] { EndpointsConfiguration.class });
 	}
 
+	@Test
+	void actuatorEndpointsWhenSecurityAvailable() {
+		WebApplicationContextRunner contextRunner = getContextRunner(
+				new Class[] { EndpointsConfiguration.class, ResourceConfigConfiguration.class },
+				getAutoconfigurations(ManagementWebSecurityAutoConfiguration.class));
+		contextRunner.run((context) -> {
+			int port = context.getSourceApplicationContext(AnnotationConfigServletWebServerApplicationContext.class)
+					.getWebServer().getPort();
+			WebTestClient client = WebTestClient.bindToServer().baseUrl("http://localhost:" + port).build();
+			client.get().uri("/actuator").exchange().expectStatus().isUnauthorized();
+		});
+
+	}
+
 	protected void testJerseyEndpoints(Class<?>[] userConfigurations) {
-		FilteredClassLoader classLoader = new FilteredClassLoader(DispatcherServlet.class);
+		getContextRunner(userConfigurations, getAutoconfigurations()).run((context) -> {
-		new WebApplicationContextRunner(AnnotationConfigServletWebServerApplicationContext::new)
+			int port = context.getSourceApplicationContext(AnnotationConfigServletWebServerApplicationContext.class)
-				.withClassLoader(classLoader)
-				.withConfiguration(AutoConfigurations.of(JacksonAutoConfiguration.class, JerseyAutoConfiguration.class,
-						EndpointAutoConfiguration.class, ServletWebServerFactoryAutoConfiguration.class,
-						WebEndpointAutoConfiguration.class, ManagementContextAutoConfiguration.class,
-						BeansEndpointAutoConfiguration.class))
-				.withUserConfiguration(userConfigurations)
-				.withPropertyValues("management.endpoints.web.exposure.include:*", "server.port:0").run((context) -> {
-					int port = context
-							.getSourceApplicationContext(AnnotationConfigServletWebServerApplicationContext.class)
 					.getWebServer().getPort();
 			WebTestClient client = WebTestClient.bindToServer().baseUrl("http://localhost:" + port).build();
 			client.get().uri("/actuator").exchange().expectStatus().isOk().expectBody().jsonPath("_links.beans")
@@ -75,6 +85,23 @@ class JerseyEndpointIntegrationTests {
 		});
 	}
 
+	private WebApplicationContextRunner getContextRunner(Class<?>[] userConfigurations, Class<?>[] autoConfigurations) {
+		FilteredClassLoader classLoader = new FilteredClassLoader(DispatcherServlet.class);
+		return new WebApplicationContextRunner(AnnotationConfigServletWebServerApplicationContext::new)
+				.withClassLoader(classLoader).withConfiguration(AutoConfigurations.of(autoConfigurations))
+				.withUserConfiguration(userConfigurations)
+				.withPropertyValues("management.endpoints.web.exposure.include:*", "server.port:0");
+	}
+
+	private Class<?>[] getAutoconfigurations(Class<?>... additional) {
+		List<Class<?>> autoconfigurations = new ArrayList<>(Arrays.asList(JacksonAutoConfiguration.class,
+				JerseyAutoConfiguration.class, EndpointAutoConfiguration.class,
+				ServletWebServerFactoryAutoConfiguration.class, WebEndpointAutoConfiguration.class,
+				ManagementContextAutoConfiguration.class, BeansEndpointAutoConfiguration.class));
+		autoconfigurations.addAll(Arrays.asList(additional));
+		return autoconfigurations.toArray(new Class<?>[0]);
+	}
+
 	@ControllerEndpoint(id = "controller")
 	static class TestControllerEndpoint {
 

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

@@ -30,6 +30,7 @@ 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.autoconfigure.web.servlet.WebMvcAutoConfiguration;
 import org.springframework.boot.test.context.assertj.AssertableWebApplicationContext;
 import org.springframework.boot.test.context.runner.WebApplicationContextRunner;
 import org.springframework.context.annotation.Configuration;
@@ -56,7 +57,7 @@ class ManagementWebSecurityAutoConfigurationTests {
 	private WebApplicationContextRunner contextRunner = new WebApplicationContextRunner().withConfiguration(
 			AutoConfigurations.of(HealthContributorAutoConfiguration.class, HealthEndpointAutoConfiguration.class,
 					InfoEndpointAutoConfiguration.class, EnvironmentEndpointAutoConfiguration.class,
-					EndpointAutoConfiguration.class, WebEndpointAutoConfiguration.class,
+					EndpointAutoConfiguration.class, WebMvcAutoConfiguration.class, WebEndpointAutoConfiguration.class,
 					SecurityAutoConfiguration.class, ManagementWebSecurityAutoConfiguration.class));
 
 	@Test

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-actuator/src/test/java/smoketest/actuator/CorsSampleActuatorApplicationTests.java

@@ -0,0 +1,83 @@
+/*
+ * Copyright 2012-2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package smoketest.actuator;
+
+import java.net.URI;
+import java.util.Map;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.web.client.LocalHostUriTemplateHandler;
+import org.springframework.boot.test.web.client.TestRestTemplate;
+import org.springframework.boot.web.client.RestTemplateBuilder;
+import org.springframework.context.ApplicationContext;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.RequestEntity;
+import org.springframework.http.ResponseEntity;
+import org.springframework.test.context.ActiveProfiles;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Integration test for cors preflight requests to management endpoints.
+ *
+ * @author Madhura Bhave
+ */
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
+@ActiveProfiles("cors")
+class CorsSampleActuatorApplicationTests {
+
+	private TestRestTemplate testRestTemplate;
+
+	@Autowired
+	private ApplicationContext applicationContext;
+
+	@BeforeEach
+	void setUp() {
+		RestTemplateBuilder builder = new RestTemplateBuilder();
+		LocalHostUriTemplateHandler handler = new LocalHostUriTemplateHandler(this.applicationContext.getEnvironment(),
+				"http");
+		builder = builder.uriTemplateHandler(handler);
+		this.testRestTemplate = new TestRestTemplate(builder);
+	}
+
+	@Test
+	void endpointShouldReturnUnauthorized() {
+		ResponseEntity<?> entity = this.testRestTemplate.getForEntity("/actuator/env", Map.class);
+		assertThat(entity.getStatusCode()).isEqualTo(HttpStatus.UNAUTHORIZED);
+	}
+
+	@Test
+	void preflightRequestToEndpointShouldReturnOk() throws Exception {
+		RequestEntity<?> healthRequest = RequestEntity.options(new URI("/actuator/env"))
+				.header("Origin", "http://localhost:8080").header("Access-Control-Request-Method", "GET").build();
+		ResponseEntity<?> exchange = this.testRestTemplate.exchange(healthRequest, Map.class);
+		assertThat(exchange.getStatusCode()).isEqualTo(HttpStatus.OK);
+	}
+
+	@Test
+	void preflightRequestWhenCorsConfigInvalidShouldReturnForbidden() throws Exception {
+		RequestEntity<?> entity = RequestEntity.options(new URI("/actuator/env"))
+				.header("Origin", "http://localhost:9095").header("Access-Control-Request-Method", "GET").build();
+		ResponseEntity<byte[]> exchange = this.testRestTemplate.exchange(entity, byte[].class);
+		assertThat(exchange.getStatusCode()).isEqualTo(HttpStatus.FORBIDDEN);
+	}
+
+}

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-actuator/src/test/resources/application-cors.properties

@@ -0,0 +1,2 @@
+management.endpoints.web.cors.allowed-origins=http://localhost:8080
+management.endpoints.web.cors.allowed-methods=GET