Permit write and delete operations on Cloud Foundry with Spring Security

Update `CloudFoundryActuatorAutoConfiguration` so that CSRF protection
is ignored for Cloud Foundry endpoint requests. This aligns with the
behavior of Spring Boot 3.4 where `ignoring()` was used for security
configuration. With the migration to `permitAll()` we now need
additional CSRF configuration.

Fixes gh-45848

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/cloudfoundry/servlet/CloudFoundryActuatorAutoConfiguration.java

@@ -174,6 +174,7 @@ public class CloudFoundryActuatorAutoConfiguration {
 		SecurityFilterChain cloudFoundrySecurityFilterChain(HttpSecurity http,
 				CloudFoundryWebEndpointServletHandlerMapping handlerMapping) throws Exception {
 			RequestMatcher cloudFoundryRequest = getRequestMatcher(handlerMapping);
+			http.csrf((csrf) -> csrf.ignoringRequestMatchers(cloudFoundryRequest));
 			http.securityMatchers((matches) -> matches.requestMatchers(cloudFoundryRequest))
 				.authorizeHttpRequests((authorize) -> authorize.anyRequest().permitAll());
 			return http.build();

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/cloudfoundry/servlet/CloudFoundryActuatorAutoConfigurationTests.java

@@ -33,6 +33,7 @@ import org.springframework.boot.actuate.endpoint.ApiVersion;
 import org.springframework.boot.actuate.endpoint.EndpointId;
 import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
 import org.springframework.boot.actuate.endpoint.annotation.ReadOperation;
+import org.springframework.boot.actuate.endpoint.annotation.WriteOperation;
 import org.springframework.boot.actuate.endpoint.web.EndpointMapping;
 import org.springframework.boot.actuate.endpoint.web.ExposableWebEndpoint;
 import org.springframework.boot.actuate.endpoint.web.WebOperation;
@@ -49,17 +50,24 @@ import org.springframework.boot.test.context.assertj.AssertableWebApplicationCon
 import org.springframework.boot.test.context.runner.WebApplicationContextRunner;
 import org.springframework.context.ApplicationContext;
 import org.springframework.http.HttpMethod;
+import org.springframework.http.MediaType;
 import org.springframework.mock.web.MockHttpServletRequest;
 import org.springframework.security.config.BeanIds;
 import org.springframework.security.web.FilterChainProxy;
 import org.springframework.security.web.SecurityFilterChain;
 import org.springframework.test.util.ReflectionTestUtils;
+import org.springframework.test.web.servlet.MockMvc;
 import org.springframework.test.web.servlet.assertj.MockMvcTester;
+import org.springframework.test.web.servlet.setup.MockMvcBuilders;
 import org.springframework.web.client.RestTemplate;
 import org.springframework.web.cors.CorsConfiguration;
 import org.springframework.web.filter.CompositeFilter;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.springframework.security.test.web.servlet.request.SecurityMockMvcRequestPostProcessors.csrf;
+import static org.springframework.security.test.web.servlet.setup.SecurityMockMvcConfigurers.springSecurity;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
 
 /**
  * Tests for {@link CloudFoundryActuatorAutoConfiguration}.
@@ -170,7 +178,7 @@ class CloudFoundryActuatorAutoConfigurationTests {
 	}
 
 	@Test
-	void cloudFoundryPathsIgnoredBySpringSecurity() {
+	void cloudFoundryPathsPermittedBySpringSecurity() {
 		this.contextRunner.withBean(TestEndpoint.class, TestEndpoint::new)
 			.withPropertyValues("VCAP_APPLICATION:---", "vcap.application.application_id:my-app-id")
 			.run((context) -> {
@@ -189,6 +197,19 @@ class CloudFoundryActuatorAutoConfigurationTests {
 			});
 	}
 
+	@Test
+	void cloudFoundryPathsPermittedWithCsrfBySpringSecurity() {
+		this.contextRunner.withBean(TestEndpoint.class, TestEndpoint::new)
+			.withPropertyValues("VCAP_APPLICATION:---", "vcap.application.application_id:my-app-id")
+			.run((context) -> {
+				MockMvc mvc = MockMvcBuilders.webAppContextSetup(context).apply(springSecurity()).build();
+				mvc.perform(post(BASE_PATH + "/test?name=test").contentType(MediaType.APPLICATION_JSON)
+					.with(csrf().useInvalidToken())).andExpect(status().isServiceUnavailable());
+				// If CSRF fails we'll get a 403, if it works we get service unavailable
+				// because of "Cloud controller URL is not available"
+			});
+	}
+
 	private SecurityFilterChain getSecurityFilterChain(AssertableWebApplicationContext context) {
 		Filter springSecurityFilterChain = context.getBean(BeanIds.SPRING_SECURITY_FILTER_CHAIN, Filter.class);
 		FilterChainProxy filterChainProxy = getFilterChainProxy(springSecurityFilterChain);
@@ -258,7 +279,7 @@ class CloudFoundryActuatorAutoConfigurationTests {
 					.findFirst()
 					.get();
 				Collection<WebOperation> operations = endpoint.getOperations();
-				assertThat(operations).hasSize(1);
+				assertThat(operations).hasSize(2);
 				assertThat(operations.iterator().next().getRequestPredicate().getPath()).isEqualTo("test");
 			});
 	}
@@ -307,6 +328,10 @@ class CloudFoundryActuatorAutoConfigurationTests {
 			return "hello world";
 		}
 
+		@WriteOperation
+		void update(String name) {
+		}
+
 	}
 
 }