Disable default logout page when logout disabled

Closes gh-9475

config/src/main/java/org/springframework/security/config/annotation/web/configurers/DefaultLoginPageConfigurer.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2013 the original author or authors.
+ * Copyright 2002-2021 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.
@@ -100,7 +100,10 @@ public final class DefaultLoginPageConfigurer<H extends HttpSecurityBuilder<H>>
 		if (loginPageGeneratingFilter.isEnabled() && authenticationEntryPoint == null) {
 			loginPageGeneratingFilter = postProcess(loginPageGeneratingFilter);
 			http.addFilter(loginPageGeneratingFilter);
-			http.addFilter(this.logoutPageGeneratingFilter);
+			LogoutConfigurer<H> logoutConfigurer = http.getConfigurer(LogoutConfigurer.class);
+			if (logoutConfigurer != null) {
+				http.addFilter(this.logoutPageGeneratingFilter);
+			}
 		}
 	}
 

config/src/main/java/org/springframework/security/config/web/server/ServerHttpSecurity.java

@@ -3264,7 +3264,10 @@ public class ServerHttpSecurity {
 			}
 			if (loginPage != null) {
 				http.addFilterAt(loginPage, SecurityWebFiltersOrder.LOGIN_PAGE_GENERATING);
-				http.addFilterAt(new LogoutPageGeneratingWebFilter(), SecurityWebFiltersOrder.LOGOUT_PAGE_GENERATING);
+				if (http.logout != null) {
+					http.addFilterAt(new LogoutPageGeneratingWebFilter(),
+							SecurityWebFiltersOrder.LOGOUT_PAGE_GENERATING);
+				}
 			}
 		}
 

config/src/test/java/org/springframework/security/config/annotation/web/configurers/DefaultLoginPageConfigurerTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2021 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.
@@ -44,11 +44,14 @@ import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.verify;
+import static org.springframework.security.config.Customizer.withDefaults;
 import static org.springframework.security.test.web.servlet.request.SecurityMockMvcRequestPostProcessors.csrf;
+import static org.springframework.security.test.web.servlet.request.SecurityMockMvcRequestPostProcessors.user;
 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.redirectedUrl;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
 
 /**
  * Tests for {@link DefaultLoginPageConfigurer}
@@ -217,6 +220,18 @@ public class DefaultLoginPageConfigurerTests {
 				));
 	}
 
+	@Test
+	public void formLoginWhenLogoutEnabledThenCreatesDefaultLogoutPage() throws Exception {
+		this.spring.register(DefaultLogoutPageConfig.class).autowire();
+		this.mvc.perform(get("/logout").with(user("user"))).andExpect(status().isOk());
+	}
+
+	@Test
+	public void formLoginWhenLogoutDisabledThenDefaultLogoutPageDoesNotExist() throws Exception {
+		this.spring.register(LogoutDisabledConfig.class).autowire();
+		this.mvc.perform(get("/logout").with(user("user"))).andExpect(status().isNotFound());
+	}
+
 	@EnableWebSecurity
 	static class DefaultLoginPageConfig extends WebSecurityConfigurerAdapter {
 		@Override
@@ -552,6 +567,41 @@ public class DefaultLoginPageConfigurerTests {
 		}
 	}
 
+	@EnableWebSecurity
+	static class DefaultLogoutPageConfig extends WebSecurityConfigurerAdapter {
+
+		@Override
+		protected void configure(HttpSecurity http) throws Exception {
+			// @formatter:off
+			http
+				.authorizeRequests((authorize) -> authorize
+					.anyRequest().authenticated()
+				)
+				.formLogin(withDefaults());
+			// @formatter:on
+		}
+
+	}
+
+	@EnableWebSecurity
+	static class LogoutDisabledConfig extends WebSecurityConfigurerAdapter {
+
+		@Override
+		protected void configure(HttpSecurity http) throws Exception {
+			// @formatter:off
+			http
+					.authorizeRequests((authorize) -> authorize
+							.anyRequest().authenticated()
+					)
+					.formLogin(withDefaults())
+					.logout((logout) -> logout
+							.disable()
+					);
+			// @formatter:on
+		}
+
+	}
+
 	static class ReflectingObjectPostProcessor implements ObjectPostProcessor<Object> {
 		@Override
 		public <O> O postProcess(O object) {

config/src/test/java/org/springframework/security/config/web/server/LogoutSpecTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2021 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.
@@ -25,7 +25,10 @@ import org.springframework.security.web.server.context.WebSessionServerSecurityC
 import org.springframework.security.web.server.util.matcher.ServerWebExchangeMatchers;
 import org.springframework.test.web.reactive.server.WebTestClient;
 import org.springframework.security.test.web.reactive.server.WebTestClientBuilder;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
 
+import static org.assertj.core.api.Assertions.assertThat;
 import static org.springframework.security.config.Customizer.withDefaults;
 
 /**
@@ -167,7 +170,8 @@ public class LogoutSpecTests {
 	}
 
 	@Test
-	public void logoutWhenDisabledThenPostToLogoutDoesNothing() {
+	public void logoutWhenDisabledThenDefaultLogoutPageDoesNotExist() {
+		// @formatter:off
 		SecurityWebFilterChain securityWebFilter = this.http
 				.authorizeExchange()
 				.anyExchange().authenticated()
@@ -177,7 +181,7 @@ public class LogoutSpecTests {
 				.build();
 
 		WebTestClient webTestClient = WebTestClientBuilder
-				.bindToWebFilters(securityWebFilter)
+				.bindToControllerAndWebFilters(HomeController.class, securityWebFilter)
 				.build();
 
 		WebDriver driver = WebTestClientHtmlUnitDriverBuilder
@@ -191,15 +195,10 @@ public class LogoutSpecTests {
 				.username("user")
 				.password("password")
 				.submit(FormLoginTests.HomePage.class);
-
+		// @formatter:on
 		homePage.assertAt();
-
-		FormLoginTests.DefaultLogoutPage.to(driver)
-				.assertAt()
-				.logout();
-
-		homePage
-				.assertAt();
+		FormLoginTests.DefaultLogoutPage.to(driver);
+		assertThat(driver.getPageSource()).isEmpty();
 	}
 
 
@@ -243,4 +242,15 @@ public class LogoutSpecTests {
 		FormLoginTests.HomePage.to(driver, FormLoginTests.DefaultLoginPage.class)
 				.assertAt();
 	}
+
+	@RestController
+	public static class HomeController {
+
+		@GetMapping("/")
+		public String ok() {
+			return "ok";
+		}
+
+	}
+
 }