Ability to configure authenticationDetailsSource in AnonymousConfigurer

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

@@ -19,7 +19,10 @@
 import java.util.List;
 import java.util.UUID;
 
+import jakarta.servlet.http.HttpServletRequest;
+
 import org.springframework.security.authentication.AnonymousAuthenticationProvider;
+import org.springframework.security.authentication.AuthenticationDetailsSource;
 import org.springframework.security.authentication.AuthenticationProvider;
 import org.springframework.security.config.Customizer;
 import org.springframework.security.config.annotation.SecurityConfigurer;
@@ -39,6 +42,7 @@
  * other than applying this {@link SecurityConfigurer}.
  *
  * @author Rob Winch
+ * @author DingHao
  * @since 3.2
  */
 public final class AnonymousConfigurer<H extends HttpSecurityBuilder<H>>
@@ -50,6 +54,8 @@ public final class AnonymousConfigurer<H extends HttpSecurityBuilder<H>>
 
 	private AnonymousAuthenticationFilter authenticationFilter;
 
+	private AuthenticationDetailsSource<HttpServletRequest, ?> authenticationDetailsSource;
+
 	private Object principal = "anonymousUser";
 
 	private List<GrantedAuthority> authorities = AuthorityUtils.createAuthorityList("ROLE_ANONYMOUS");
@@ -142,6 +148,19 @@ public AnonymousConfigurer<H> authenticationFilter(AnonymousAuthenticationFilter
 		return this;
 	}
 
+	/**
+	 * Specifies a custom {@link AuthenticationDetailsSource} to use for anonymous
+	 * authentication.
+	 * @param authenticationDetailsSource the custom {@link AuthenticationDetailsSource}
+	 * to use
+	 * @return {@link AnonymousConfigurer} for additional customization
+	 */
+	public AnonymousConfigurer<H> authenticationDetailsSource(
+			AuthenticationDetailsSource<HttpServletRequest, ?> authenticationDetailsSource) {
+		this.authenticationDetailsSource = authenticationDetailsSource;
+		return this;
+	}
+
 	@Override
 	public void init(H http) {
 		if (this.authenticationProvider == null) {
@@ -156,6 +175,9 @@ public void configure(H http) {
 		if (this.authenticationFilter == null) {
 			this.authenticationFilter = new AnonymousAuthenticationFilter(getKey(), this.principal, this.authorities);
 		}
+		if (this.authenticationDetailsSource != null) {
+			this.authenticationFilter.setAuthenticationDetailsSource(this.authenticationDetailsSource);
+		}
 		this.authenticationFilter.setSecurityContextHolderStrategy(getSecurityContextHolderStrategy());
 		this.authenticationFilter.afterPropertiesSet();
 		http.addFilter(this.authenticationFilter);

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

@@ -16,13 +16,15 @@
 
 package org.springframework.security.config.annotation.web.configurers;
 
+import jakarta.servlet.http.HttpServletRequest;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.security.authentication.AnonymousAuthenticationToken;
+import org.springframework.security.authentication.AuthenticationDetailsSource;
 import org.springframework.security.config.annotation.SecurityContextChangedListenerConfig;
 import org.springframework.security.config.annotation.web.builders.HttpSecurity;
 import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
@@ -39,6 +41,8 @@
 import org.springframework.web.bind.annotation.RestController;
 import org.springframework.web.servlet.config.annotation.EnableWebMvc;
 
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.verify;
 import static org.springframework.security.config.Customizer.withDefaults;
 import static org.springframework.security.config.annotation.SecurityContextChangedListenerArgumentMatchers.setAuthentication;
@@ -101,6 +105,37 @@ public void shouldReturnMyCustomAnonymousConfig() throws Exception {
 		this.mockMvc.perform(get("/")).andExpect(status().isOk()).andExpect(content().string("myAnonymousUser"));
 	}
 
+	@Test
+	public void anonymousAuthenticationWhenUsingAuthenticationDetailsSourceRefThenMatchesNamespace() throws Exception {
+		this.spring.register(AuthenticationDetailsSourceAnonymousConfig.class).autowire();
+		AuthenticationDetailsSource<HttpServletRequest, ?> source = this.spring.getContext()
+			.getBean(AuthenticationDetailsSource.class);
+		this.mockMvc.perform(get("/"));
+		verify(source).buildDetails(any(HttpServletRequest.class));
+	}
+
+	@Configuration
+	@EnableWebSecurity
+	@EnableWebMvc
+	static class AuthenticationDetailsSourceAnonymousConfig {
+
+		AuthenticationDetailsSource<HttpServletRequest, ?> authenticationDetailsSource = mock(
+				AuthenticationDetailsSource.class);
+
+		@Bean
+		SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
+			return http
+				.anonymous((anonymous) -> anonymous.authenticationDetailsSource(this.authenticationDetailsSource))
+				.build();
+		}
+
+		@Bean
+		AuthenticationDetailsSource<HttpServletRequest, ?> authenticationDetailsSource() {
+			return this.authenticationDetailsSource;
+		}
+
+	}
+
 	@Configuration
 	@EnableWebSecurity
 	@EnableWebMvc