Support for AuthenticationManagerBuilder injection into user code

Spring Boot provides a default AuthenticatiomManager for getting
started quickly with security and never exposing insecure
endpoints. To override that feature as users move to the next
stage in their project, they may have to do something slightly
different depending on whether it is a webapp or not.

In any app (web or not), providing a @Bean of type
AuthenticationManager always works, but you don't get the benefit of
the builder features.

In a webapp the user can also extend WebSecurityConfigurerAdapter
to provides a custom AuthenticationManager, and the preferred
way of doing that is via a void method that is autowired with an
AuthenticationManagerBuilder. The default AuthenticationManager is
built in a configurer with @Order(LOWEST_PRECEDENCE - 3) so
to override it the user's confugrer must have higher precedence
(lower @Order).

@EnableGlobalMethodSecurity can also be used in a non-webapp, and
Spring Boot will still provide a default AuthenticationManager.
To override it the user has to either extend
GlobalMethodSecurityConfiguration or provide a @Bean of type
AuthenticationManager (there's no other way to
capture the AuthenticationManagerBuilder that doesn't happen too late
in the beans lifecyle).

Fixes gh-244

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/autoconfigure/ManagementSecurityAutoConfiguration.java

@@ -202,6 +202,7 @@ public class ManagementSecurityAutoConfiguration {
 
 		@Configuration
 		@ConditionalOnMissingBean(AuthenticationManager.class)
+		@Order(Ordered.LOWEST_PRECEDENCE - 4)
 		protected static class ManagementAuthenticationManagerConfiguration extends
 				AuthenticationManagerConfiguration {
 		}

spring-boot-actuator/src/test/java/org/springframework/boot/actuate/autoconfigure/ManagementSecurityAutoConfigurationTests.java

@@ -18,22 +18,20 @@ package org.springframework.boot.actuate.autoconfigure;
 
 import org.junit.After;
 import org.junit.Test;
-import org.springframework.boot.SpringApplication;
-import org.springframework.boot.SpringApplicationBeforeRefreshEvent;
-import org.springframework.boot.autoconfigure.AutoConfigurationReportLoggingInitializer;
 import org.springframework.boot.autoconfigure.PropertyPlaceholderAutoConfiguration;
 import org.springframework.boot.autoconfigure.security.SecurityAutoConfiguration;
 import org.springframework.boot.autoconfigure.web.HttpMessageConvertersAutoConfiguration;
-import org.springframework.boot.context.listener.LoggingApplicationListener;
 import org.springframework.boot.test.EnvironmentTestUtils;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
-import org.springframework.context.event.ContextRefreshedEvent;
 import org.springframework.mock.web.MockServletContext;
 import org.springframework.security.authentication.AuthenticationManager;
 import org.springframework.security.authentication.ProviderManager;
 import org.springframework.security.authentication.TestingAuthenticationToken;
 import org.springframework.security.authentication.dao.DaoAuthenticationProvider;
+import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
+import org.springframework.security.config.annotation.web.WebSecurityConfigurer;
+import org.springframework.security.config.annotation.web.builders.WebSecurity;
 import org.springframework.security.core.Authentication;
 import org.springframework.security.core.AuthenticationException;
 import org.springframework.security.core.authority.AuthorityUtils;
@@ -74,7 +72,7 @@ public class ManagementSecurityAutoConfigurationTests {
 				ManagementServerPropertiesAutoConfiguration.class,
 				PropertyPlaceholderAutoConfiguration.class);
 		this.context.refresh();
-		assertNotNull(this.context.getBean(AuthenticationManager.class));
+		assertNotNull(this.context.getBean(AuthenticationManagerBuilder.class));
 		// 6 for static resources, one for management endpoints and one for the rest
 		assertEquals(8, this.context.getBean(FilterChainProxy.class).getFilterChains()
 				.size());
@@ -89,9 +87,9 @@ public class ManagementSecurityAutoConfigurationTests {
 				HttpMessageConvertersAutoConfiguration.class,
 				ManagementServerPropertiesAutoConfiguration.class,
 				SecurityAutoConfiguration.class,
-				ManagementSecurityAutoConfiguration.class,
+				ManagementSecurityAutoConfiguration.class, UserDetailsExposed.class,
 				PropertyPlaceholderAutoConfiguration.class);
-		debugRefresh(this.context);
+		this.context.refresh();
 		UserDetails user = getUser();
 		assertTrue(user.getAuthorities().containsAll(
 				AuthorityUtils
@@ -169,17 +167,24 @@ public class ManagementSecurityAutoConfigurationTests {
 				this.context.getBean(AuthenticationManager.class));
 	}
 
-	private static AnnotationConfigWebApplicationContext debugRefresh(
-			AnnotationConfigWebApplicationContext context) {
-		EnvironmentTestUtils.addEnvironment(context, "debug:true");
-		LoggingApplicationListener logging = new LoggingApplicationListener();
-		logging.onApplicationEvent(new SpringApplicationBeforeRefreshEvent(
-				new SpringApplication(), context, new String[0]));
-		AutoConfigurationReportLoggingInitializer initializer = new AutoConfigurationReportLoggingInitializer();
-		initializer.initialize(context);
-		context.refresh();
-		initializer.onApplicationEvent(new ContextRefreshedEvent(context));
-		return context;
+	@Configuration
+	protected static class UserDetailsExposed implements
+			WebSecurityConfigurer<WebSecurity> {
+
+		@Override
+		public void init(WebSecurity builder) throws Exception {
+		}
+
+		@Override
+		public void configure(WebSecurity builder) throws Exception {
+		}
+
+		@Bean
+		public AuthenticationManager authenticationManager(
+				AuthenticationManagerBuilder builder) throws Exception {
+			return builder.getOrBuild();
+		}
+
 	}
 
 	@Configuration

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/AuthenticationManagerConfiguration.java

@@ -16,22 +16,20 @@
 
 package org.springframework.boot.autoconfigure.security;
 
-import java.util.LinkedHashSet;
 import java.util.List;
-import java.util.Set;
 
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
-import org.springframework.boot.autoconfigure.security.SecurityProperties.User;
-import org.springframework.context.annotation.Bean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.core.Ordered;
+import org.springframework.core.annotation.Order;
 import org.springframework.security.authentication.AuthenticationManager;
 import org.springframework.security.config.annotation.ObjectPostProcessor;
 import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
-import org.springframework.security.config.annotation.authentication.configurers.provisioning.InMemoryUserDetailsManagerConfigurer;
+import org.springframework.security.config.annotation.web.WebSecurityConfigurer;
+import org.springframework.security.config.annotation.web.builders.WebSecurity;
 
 /**
  * Configuration for a Spring Security in-memory {@link AuthenticationManager}.
@@ -41,10 +39,10 @@ import org.springframework.security.config.annotation.authentication.configurers
 @Configuration
 @ConditionalOnBean(ObjectPostProcessor.class)
 @ConditionalOnMissingBean(AuthenticationManager.class)
-public class AuthenticationManagerConfiguration {
-
-	private static Log logger = LogFactory
-			.getLog(AuthenticationManagerConfiguration.class);
+@ConditionalOnWebApplication
+@Order(Ordered.LOWEST_PRECEDENCE - 3)
+public class AuthenticationManagerConfiguration implements
+		WebSecurityConfigurer<WebSecurity> {
 
 	@Autowired
 	private SecurityProperties security;
@@ -52,26 +50,17 @@ public class AuthenticationManagerConfiguration {
 	@Autowired
 	private List<SecurityPrequisite> dependencies;
 
-	@Bean
-	public AuthenticationManager authenticationManager(
-			ObjectPostProcessor<Object> objectPostProcessor) throws Exception {
+	@Override
+	public void init(WebSecurity builder) throws Exception {
+	}
 
-		InMemoryUserDetailsManagerConfigurer<AuthenticationManagerBuilder> builder = new AuthenticationManagerBuilder(
-				objectPostProcessor).inMemoryAuthentication();
-		User user = this.security.getUser();
-
-		if (user.isDefaultPassword()) {
-			logger.info("\n\nUsing default password for application endpoints: "
-					+ user.getPassword() + "\n\n");
-		}
-
-		Set<String> roles = new LinkedHashSet<String>(user.getRole());
-
-		builder.withUser(user.getName()).password(user.getPassword())
-				.roles(roles.toArray(new String[roles.size()]));
-
-		return builder.and().build();
+	@Override
+	public void configure(WebSecurity builder) throws Exception {
+	}
 
+	@Autowired
+	public void authentication(AuthenticationManagerBuilder builder) throws Exception {
+		SecurityAutoConfiguration.authentication(builder, this.security);
 	}
 
 }

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/security/SecurityAutoConfiguration.java

@@ -16,17 +16,39 @@
 
 package org.springframework.boot.autoconfigure.security;
 
+import java.lang.reflect.Method;
+import java.util.Collection;
+import java.util.LinkedHashSet;
+import java.util.Set;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.security.SecurityProperties.User;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Import;
 import org.springframework.security.authentication.AuthenticationManager;
+import org.springframework.security.config.annotation.AbstractConfiguredSecurityBuilder;
+import org.springframework.security.config.annotation.ObjectPostProcessor;
+import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
+import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
+import org.springframework.util.ReflectionUtils;
 
 /**
- * {@link EnableAutoConfiguration Auto-configuration} for Spring Security.
+ * {@link EnableAutoConfiguration Auto-configuration} for Spring Security. Provides an
+ * {@link AuthenticationManager} based on configuration bound to a
+ * {@link SecurityProperties} bean. There is one user (named "user") whose password is
+ * random and printed on the console at INFO level during startup. In a webapp this
+ * configuration also secures all web endpoints (except some well-known static resource)
+ * locations with HTTP basic security. To replace all the default behaviour in a webapp
+ * provide a <code>@Configuration</code> with <code>@EnableWebSecurity</code>. To just add
+ * your own layer of application security in front of the defaults, add a
+ * <code>@Configuration</code> of type {@link WebSecurityConfigurerAdapter}.
  * 
  * @author Dave Syer
  */
@@ -37,10 +59,67 @@ import org.springframework.security.authentication.AuthenticationManager;
 		AuthenticationManagerConfiguration.class })
 public class SecurityAutoConfiguration {
 
+	private static Log logger = LogFactory.getLog(SecurityAutoConfiguration.class);
+
 	@Bean
 	@ConditionalOnMissingBean
 	public SecurityProperties securityProperties() {
 		return new SecurityProperties();
 	}
 
+	@Bean
+	@ConditionalOnBean(AuthenticationManagerBuilder.class)
+	@ConditionalOnMissingBean
+	public AuthenticationManager authenticationManager(
+			AuthenticationManagerBuilder builder, ObjectPostProcessor<Object> processor)
+			throws Exception {
+		if (!isBuilt(builder)) {
+			authentication(builder, securityProperties());
+		}
+		else if (builder.getOrBuild() == null) {
+			builder = new AuthenticationManagerBuilder(processor);
+			authentication(builder, securityProperties());
+		}
+		return builder.getOrBuild();
+	}
+
+	/**
+	 * Convenience method for building the default AuthenticationManager from
+	 * SecurityProperties.
+	 * 
+	 * @param builder the AuthenticationManagerBuilder to use
+	 * @param security the SecurityProperties in use
+	 */
+	public static void authentication(AuthenticationManagerBuilder builder,
+			SecurityProperties security) throws Exception {
+
+		if (isBuilt(builder)) {
+			return;
+		}
+
+		User user = security.getUser();
+
+		if (user.isDefaultPassword()) {
+			logger.info("\n\nUsing default password for application endpoints: "
+					+ user.getPassword() + "\n\n");
+		}
+
+		Set<String> roles = new LinkedHashSet<String>(user.getRole());
+
+		builder.inMemoryAuthentication().withUser(user.getName())
+				.password(user.getPassword())
+				.roles(roles.toArray(new String[roles.size()]));
+
+	}
+
+	private static boolean isBuilt(AuthenticationManagerBuilder builder) {
+		Method configurers = ReflectionUtils.findMethod(
+				AbstractConfiguredSecurityBuilder.class, "getConfigurers");
+		Method unbuilt = ReflectionUtils.findMethod(
+				AbstractConfiguredSecurityBuilder.class, "isUnbuilt");
+		ReflectionUtils.makeAccessible(configurers);
+		ReflectionUtils.makeAccessible(unbuilt);
+		return !((Collection<?>) ReflectionUtils.invokeMethod(configurers, builder))
+				.isEmpty() || !((Boolean) ReflectionUtils.invokeMethod(unbuilt, builder));
+	}
 }

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/security/SecurityAutoConfigurationTests.java

@@ -34,6 +34,7 @@ import org.springframework.mock.web.MockServletContext;
 import org.springframework.orm.jpa.JpaTransactionManager;
 import org.springframework.security.authentication.AuthenticationManager;
 import org.springframework.security.authentication.TestingAuthenticationToken;
+import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
 import org.springframework.security.core.Authentication;
 import org.springframework.security.core.AuthenticationException;
 import org.springframework.security.web.FilterChainProxy;
@@ -58,7 +59,7 @@ public class SecurityAutoConfigurationTests {
 		this.context.register(SecurityAutoConfiguration.class,
 				PropertyPlaceholderAutoConfiguration.class);
 		debugRefresh(this.context);
-		assertNotNull(this.context.getBean(AuthenticationManager.class));
+		assertNotNull(this.context.getBean(AuthenticationManagerBuilder.class));
 		// 4 for static resources and one for the rest
 		assertEquals(5, this.context.getBean(FilterChainProxy.class).getFilterChains()
 				.size());

spring-boot-samples/spring-boot-sample-secure/src/main/java/sample/secure/SampleSecureApplication.java

@@ -48,7 +48,7 @@ public class SampleSecureApplication implements CommandLineRunner {
 	}
 
 	public static void main(String[] args) throws Exception {
-		SpringApplication.run(SampleSecureApplication.class, args);
+		SpringApplication.run(SampleSecureApplication.class, "--debug");
 	}
 
 }

spring-boot-samples/spring-boot-sample-secure/src/test/java/sample/secure/SampleSecureApplicationTests.java

@@ -16,12 +16,15 @@
 
 package sample.secure;
 
+import static org.junit.Assert.assertEquals;
+
 import org.junit.After;
+import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.SpringApplicationConfiguration;
-import org.springframework.context.annotation.Bean;
+import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.PropertySource;
 import org.springframework.security.access.AccessDeniedException;
@@ -34,8 +37,6 @@ import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
 
 import sample.secure.SampleSecureApplicationTests.TestConfiguration;
 
-import static org.junit.Assert.assertEquals;
-
 /**
  * Basic integration tests for demo application.
  * 
@@ -50,8 +51,17 @@ public class SampleSecureApplicationTests {
 	private SampleService service;
 
 	@Autowired
+	private ApplicationContext context;
+
 	private Authentication authentication;
 
+	@Before
+	public void init() {
+		AuthenticationManager authenticationManager = context.getBean(AuthenticationManager.class);
+		authentication = authenticationManager.authenticate(new UsernamePasswordAuthenticationToken(
+				"user", "password"));
+	}
+
 	@After
 	public void close() {
 		SecurityContextHolder.clearContext();
@@ -84,16 +94,6 @@ public class SampleSecureApplicationTests {
 	@Configuration
 	protected static class TestConfiguration {
 
-		@Autowired
-		private AuthenticationManager authenticationManager;
-
-		@Bean
-		public Authentication user() {
-			return authenticationManager
-					.authenticate(new UsernamePasswordAuthenticationToken("user",
-							"password"));
-		}
-
 	}
 
 }