Polish Max Sessions on WebFlux

This commit changes the PreventLoginServerMaximumSessionsExceededHandler to invalidate the WebSession in addition to throwing the error, this is needed otherwise the session would still be saved with the security context. It also changes the SessionRegistryWebSession to first perform the operation on the delegate and then invoke the needed method on the ReactiveSessionRegistry

Issue gh-6192

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

@@ -2143,19 +2143,23 @@ public boolean isStarted() {
 				@Override
 				public Mono<Void> changeSessionId() {
 					String currentId = this.session.getId();
-					return SessionRegistryWebFilter.this.sessionRegistry.removeSessionInformation(currentId)
-						.flatMap((information) -> this.session.changeSessionId().thenReturn(information))
-						.flatMap((information) -> {
-							information = information.withSessionId(this.session.getId());
-							return SessionRegistryWebFilter.this.sessionRegistry.saveSessionInformation(information);
-						});
+					return this.session.changeSessionId()
+						.then(Mono.defer(
+								() -> SessionRegistryWebFilter.this.sessionRegistry.removeSessionInformation(currentId)
+									.flatMap((information) -> {
+										information = information.withSessionId(this.session.getId());
+										return SessionRegistryWebFilter.this.sessionRegistry
+											.saveSessionInformation(information);
+									})));
 				}
 
 				@Override
 				public Mono<Void> invalidate() {
 					String currentId = this.session.getId();
-					return SessionRegistryWebFilter.this.sessionRegistry.removeSessionInformation(currentId)
-						.flatMap((information) -> this.session.invalidate());
+					return this.session.invalidate()
+						.then(Mono.defer(() -> SessionRegistryWebFilter.this.sessionRegistry
+							.removeSessionInformation(currentId)))
+						.then();
 				}
 
 				@Override

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

@@ -67,6 +67,7 @@
 import org.springframework.web.server.adapter.WebHttpHandlerBuilder;
 import org.springframework.web.server.session.DefaultWebSessionManager;
 
+import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.BDDMockito.given;
 import static org.mockito.Mockito.mock;
@@ -95,14 +96,19 @@ void loginWhenMaxSessionPreventsLoginThenSecondLoginFails() {
 		ResponseCookie firstLoginSessionCookie = loginReturningCookie(data);
 
 		// second login should fail
-		this.client.mutateWith(csrf())
+		ResponseCookie secondLoginSessionCookie = this.client.mutateWith(csrf())
 			.post()
 			.uri("/login")
 			.contentType(MediaType.MULTIPART_FORM_DATA)
 			.body(BodyInserters.fromFormData(data))
 			.exchange()
 			.expectHeader()
-			.location("/login?error");
+			.location("/login?error")
+			.returnResult(Void.class)
+			.getResponseCookies()
+			.getFirst("SESSION");
+
+		assertThat(secondLoginSessionCookie).isNull();
 
 		// first login should still be valid
 		this.client.mutateWith(csrf())

web/src/main/java/org/springframework/security/web/server/authentication/ConcurrentSessionControlServerAuthenticationSuccessHandler.java

@@ -81,8 +81,8 @@ private Mono<Void> handleConcurrency(WebFilterExchange exchange, Authentication
 						}
 					}
 				}
-				return this.maximumSessionsExceededHandler
-					.handle(new MaximumSessionsContext(authentication, registeredSessions, maximumSessions));
+				return this.maximumSessionsExceededHandler.handle(new MaximumSessionsContext(authentication,
+						registeredSessions, maximumSessions, currentSession));
 			});
 	}
 

web/src/main/java/org/springframework/security/web/server/authentication/MaximumSessionsContext.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -20,6 +20,7 @@
 
 import org.springframework.security.core.Authentication;
 import org.springframework.security.core.session.ReactiveSessionInformation;
+import org.springframework.web.server.WebSession;
 
 public final class MaximumSessionsContext {
 
@@ -29,11 +30,14 @@ public final class MaximumSessionsContext {
 
 	private final int maximumSessionsAllowed;
 
+	private final WebSession currentSession;
+
 	public MaximumSessionsContext(Authentication authentication, List<ReactiveSessionInformation> sessions,
-			int maximumSessionsAllowed) {
+			int maximumSessionsAllowed, WebSession currentSession) {
 		this.authentication = authentication;
 		this.sessions = sessions;
 		this.maximumSessionsAllowed = maximumSessionsAllowed;
+		this.currentSession = currentSession;
 	}
 
 	public Authentication getAuthentication() {
@@ -48,4 +52,8 @@ public int getMaximumSessionsAllowed() {
 		return this.maximumSessionsAllowed;
 	}
 
+	public WebSession getCurrentSession() {
+		return this.currentSession;
+	}
+
 }

web/src/main/java/org/springframework/security/web/server/authentication/PreventLoginServerMaximumSessionsExceededHandler.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -31,9 +31,9 @@ public final class PreventLoginServerMaximumSessionsExceededHandler implements S
 
 	@Override
 	public Mono<Void> handle(MaximumSessionsContext context) {
-		return Mono
-			.error(new SessionAuthenticationException("Maximum sessions of " + context.getMaximumSessionsAllowed()
-					+ " for authentication '" + context.getAuthentication().getName() + "' exceeded"));
+		return context.getCurrentSession()
+			.invalidate()
+			.then(Mono.defer(() -> Mono.error(new SessionAuthenticationException("Maximum sessions exceeded"))));
 	}
 
 }

web/src/test/java/org/springframework/security/web/server/authentication/session/InvalidateLeastUsedServerMaximumSessionsExceededHandlerTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -50,7 +50,7 @@ void handleWhenInvokedThenInvalidatesLeastRecentlyUsedSessions() {
 		given(session2.getLastAccessTime()).willReturn(Instant.ofEpochMilli(1700827760000L));
 		given(session2.invalidate()).willReturn(Mono.empty());
 		MaximumSessionsContext context = new MaximumSessionsContext(mock(Authentication.class),
-				List.of(session1, session2), 2);
+				List.of(session1, session2), 2, null);
 
 		this.handler.handle(context).block();
 
@@ -72,7 +72,7 @@ void handleWhenMoreThanOneSessionToInvalidateThenInvalidatesAllOfThem() {
 		given(session1.invalidate()).willReturn(Mono.empty());
 		given(session2.invalidate()).willReturn(Mono.empty());
 		MaximumSessionsContext context = new MaximumSessionsContext(mock(Authentication.class),
-				List.of(session1, session2, session3), 2);
+				List.of(session1, session2, session3), 2, null);
 
 		this.handler.handle(context).block();
 

web/src/test/java/org/springframework/security/web/server/authentication/session/PreventLoginServerMaximumSessionsExceededHandlerTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -19,13 +19,19 @@
 import java.util.Collections;
 
 import org.junit.jupiter.api.Test;
+import reactor.core.publisher.Mono;
+import reactor.test.StepVerifier;
 
 import org.springframework.security.authentication.TestAuthentication;
 import org.springframework.security.web.authentication.session.SessionAuthenticationException;
 import org.springframework.security.web.server.authentication.MaximumSessionsContext;
 import org.springframework.security.web.server.authentication.PreventLoginServerMaximumSessionsExceededHandler;
+import org.springframework.web.server.WebSession;
 
-import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.BDDMockito.given;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
 
 /**
  * Tests for {@link PreventLoginServerMaximumSessionsExceededHandler}.
@@ -35,13 +41,17 @@
 class PreventLoginServerMaximumSessionsExceededHandlerTests {
 
 	@Test
-	void handleWhenInvokedThenThrowsSessionAuthenticationException() {
+	void handleWhenInvokedThenInvalidateWebSessionAndThrowsSessionAuthenticationException() {
 		PreventLoginServerMaximumSessionsExceededHandler handler = new PreventLoginServerMaximumSessionsExceededHandler();
+		WebSession webSession = mock();
+		given(webSession.invalidate()).willReturn(Mono.empty());
 		MaximumSessionsContext context = new MaximumSessionsContext(TestAuthentication.authenticatedUser(),
-				Collections.emptyList(), 1);
-		assertThatExceptionOfType(SessionAuthenticationException.class)
-			.isThrownBy(() -> handler.handle(context).block())
-			.withMessage("Maximum sessions of 1 for authentication 'user' exceeded");
+				Collections.emptyList(), 1, webSession);
+		StepVerifier.create(handler.handle(context)).expectErrorSatisfies((ex) -> {
+			assertThat(ex).isInstanceOf(SessionAuthenticationException.class);
+			assertThat(ex.getMessage()).isEqualTo("Maximum sessions exceeded");
+		}).verify();
+		verify(webSession).invalidate();
 	}
 
 }