Custom role prefix for anonymous authority

config/src/main/java/org/springframework/security/config/annotation/web/builders/HttpSecurity.java

@@ -1024,7 +1024,7 @@ public HttpSecurity logout(Customizer<LogoutConfigurer<HttpSecurity>> logoutCust
 	 * @return the {@link HttpSecurity} for further customizations @
 	 */
 	public HttpSecurity anonymous(Customizer<AnonymousConfigurer<HttpSecurity>> anonymousCustomizer) {
-		anonymousCustomizer.customize(getOrApply(new AnonymousConfigurer<>()));
+		anonymousCustomizer.customize(getOrApply(new AnonymousConfigurer<>(getContext())));
 		return HttpSecurity.this;
 	}
 

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

@@ -19,12 +19,14 @@
 import java.util.List;
 import java.util.UUID;
 
+import org.springframework.context.ApplicationContext;
 import org.springframework.security.authentication.AnonymousAuthenticationProvider;
 import org.springframework.security.authentication.AuthenticationProvider;
 import org.springframework.security.config.Customizer;
 import org.springframework.security.config.annotation.SecurityConfigurer;
 import org.springframework.security.config.annotation.web.HttpSecurityBuilder;
 import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.config.core.GrantedAuthorityDefaults;
 import org.springframework.security.core.Authentication;
 import org.springframework.security.core.GrantedAuthority;
 import org.springframework.security.core.authority.AuthorityUtils;
@@ -40,6 +42,7 @@
  *
  * @author Rob Winch
  * @author DingHao
+ * @author Ngoc Nhan
  * @since 3.2
  */
 public final class AnonymousConfigurer<H extends HttpSecurityBuilder<H>>
@@ -53,15 +56,20 @@ public final class AnonymousConfigurer<H extends HttpSecurityBuilder<H>>
 
 	private Object principal = "anonymousUser";
 
-	private List<GrantedAuthority> authorities = AuthorityUtils.createAuthorityList("ROLE_ANONYMOUS");
+	private List<GrantedAuthority> authorities;
 
 	private String computedKey;
 
 	/**
 	 * Creates a new instance.
+	 * @param context the {@link ApplicationContext} to use
 	 * @see HttpSecurity#anonymous(Customizer)
 	 */
-	public AnonymousConfigurer() {
+	public AnonymousConfigurer(ApplicationContext context) {
+		GrantedAuthorityDefaults grantedAuthorityDefaults = context.getBeanProvider(GrantedAuthorityDefaults.class)
+			.getIfAvailable();
+		String rolePrefix = (grantedAuthorityDefaults != null) ? grantedAuthorityDefaults.getRolePrefix() : "ROLE_";
+		this.authorities = AuthorityUtils.createAuthorityList(rolePrefix + "ANONYMOUS");
 	}
 
 	/**

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

@@ -23,12 +23,15 @@
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.security.access.prepost.PreAuthorize;
 import org.springframework.security.authentication.AnonymousAuthenticationToken;
 import org.springframework.security.authentication.AuthenticationDetailsSource;
 import org.springframework.security.config.ObjectPostProcessor;
 import org.springframework.security.config.annotation.SecurityContextChangedListenerConfig;
+import org.springframework.security.config.annotation.method.configuration.EnableMethodSecurity;
 import org.springframework.security.config.annotation.web.builders.HttpSecurity;
 import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
+import org.springframework.security.config.core.GrantedAuthorityDefaults;
 import org.springframework.security.config.test.SpringTestContext;
 import org.springframework.security.config.test.SpringTestContextExtension;
 import org.springframework.security.core.annotation.AuthenticationPrincipal;
@@ -48,13 +51,15 @@
 import static org.mockito.Mockito.verify;
 import static org.springframework.security.config.Customizer.withDefaults;
 import static org.springframework.security.config.annotation.SecurityContextChangedListenerArgumentMatchers.setAuthentication;
+import static org.springframework.security.test.web.servlet.request.SecurityMockMvcRequestPostProcessors.anonymous;
 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
 
 /**
  * @author Rob Winch
  * @author Josh Cummings
+ * @author Ngoc Nhan
  */
 @ExtendWith(SpringTestContextExtension.class)
 public class AnonymousConfigurerTests {
@@ -116,6 +121,15 @@ public void anonymousAuthenticationWhenUsingAuthenticationDetailsSourceRefThenMa
 		verify(source).buildDetails(any(HttpServletRequest.class));
 	}
 
+	@Test
+	public void anonymousWithCustomAuthorityDefaults() throws Exception {
+		this.spring.register(AnonymousGrantedAuthorityDefaultsConfig.class, PrincipalController.class).autowire();
+		this.mockMvc.perform(get("/anonymous").with(anonymous())).andExpect(status().isForbidden());
+		this.mockMvc.perform(get("/anonymous").with(anonymous().authorities("my_roles_ANONYMOUS")))
+			.andExpect(status().isOk())
+			.andExpect(content().string("anonymous"));
+	}
+
 	@Configuration
 	@EnableWebSecurity
 	@EnableWebMvc
@@ -261,6 +275,31 @@ String principal(@AuthenticationPrincipal String principal) {
 			return principal;
 		}
 
+		@GetMapping("/anonymous")
+		@PreAuthorize("hasRole('ANONYMOUS')")
+		String getAnonymous(@AuthenticationPrincipal String principal) {
+			return principal;
+		}
+
+	}
+
+	@EnableWebMvc
+	@EnableWebSecurity
+	@EnableMethodSecurity
+	@Configuration
+	static class AnonymousGrantedAuthorityDefaultsConfig {
+
+		@Bean
+		GrantedAuthorityDefaults grantedAuthorityDefaults() {
+			return new GrantedAuthorityDefaults("my_roles_");
+		}
+
+		@Bean
+		SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
+			http.authorizeHttpRequests((authorize) -> authorize.anyRequest().anonymous());
+			return http.build();
+		}
+
 	}
 
 }

test/src/main/java/org/springframework/security/test/web/servlet/request/SecurityMockMvcRequestPostProcessors.java

@@ -117,6 +117,7 @@
  * Security.
  *
  * @author Rob Winch
+ * @author Ngoc Nhan
  * @since 4.0
  */
 public final class SecurityMockMvcRequestPostProcessors {
@@ -346,7 +347,7 @@ public static RequestPostProcessor authentication(Authentication authentication)
 	 * </code> </pre>
 	 * @return the {@link RequestPostProcessor} to use
 	 */
-	public static RequestPostProcessor anonymous() {
+	public static AnonymousRequestPostProcessor anonymous() {
 		return new AnonymousRequestPostProcessor();
 	}
 
@@ -1020,16 +1021,64 @@ private User createUser() {
 
 	}
 
-	private static class AnonymousRequestPostProcessor extends SecurityContextRequestPostProcessorSupport
+	public static final class AnonymousRequestPostProcessor extends SecurityContextRequestPostProcessorSupport
 			implements RequestPostProcessor {
 
-		private AuthenticationRequestPostProcessor delegate = new AuthenticationRequestPostProcessor(
-				new AnonymousAuthenticationToken("key", "anonymous",
-						AuthorityUtils.createAuthorityList("ROLE_ANONYMOUS")));
+		private String key = "key";
+
+		private Object principal = "anonymous";
+
+		private Collection<? extends GrantedAuthority> authorities = AuthorityUtils
+			.createAuthorityList("ROLE_ANONYMOUS");
 
 		@Override
 		public MockHttpServletRequest postProcessRequest(MockHttpServletRequest request) {
-			return this.delegate.postProcessRequest(request);
+			AuthenticationRequestPostProcessor delegate = new AuthenticationRequestPostProcessor(
+					this.createAnonymous());
+			return delegate.postProcessRequest(request);
+		}
+
+		/**
+		 * Creates a new {@link AnonymousAuthenticationToken}.
+		 * @return the {@link AnonymousAuthenticationToken} for the principal
+		 */
+		private AnonymousAuthenticationToken createAnonymous() {
+			return new AnonymousAuthenticationToken(this.key, this.principal, this.authorities);
+		}
+
+		/**
+		 * Populates the user's {@link GrantedAuthority}'s. The default is
+		 * {@code ROLE_ANONYMOUS}.
+		 * @param authorities the authorities to grant to the anonymous user
+		 * @return the {@link AnonymousRequestPostProcessor} for further customizations
+		 */
+		public AnonymousRequestPostProcessor authorities(String... authorities) {
+			Assert.notNull(authorities, "authorities cannot be null");
+			this.authorities = AuthorityUtils.createAuthorityList(authorities);
+			return this;
+		}
+
+		/**
+		 * Sets the key used to identify the anonymous user.
+		 * @param key the key to use
+		 * @return the {@link AnonymousRequestPostProcessor} for further customizations
+		 */
+		public AnonymousRequestPostProcessor key(String key) {
+			Assert.hasLength(key, "key cannot be null or empty");
+			this.key = key;
+			return this;
+		}
+
+		/**
+		 * Sets the principal for the anonymous user.
+		 * @param principal the principal to use
+		 * @return the {@link AnonymousRequestPostProcessor} for further customizations
+		 */
+		public AnonymousRequestPostProcessor principal(Object principal) {
+			Assert.notNull(principal, "principal cannot be null");
+			Assert.isTrue(!"".equals(principal), "principal cannot be empty");
+			this.principal = principal;
+			return this;
 		}
 
 	}