一、实现功能及软件版本说明

1. 使用Spring Boot集成Spring Security实现Servlet项目的安全个性化配置
2. Spring Boot版本：2.7.18
3. Spring Security版本：5.7.11

二、创建Spring Boot项目

1. 创建Spring Boot项目，目录结构如下
   
2. 引入Spring Security包，完成pom.xml如下

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.7.18</version>
        <relativePath/>
    </parent>

    <groupId>com.yu</groupId>
    <artifactId>spring-boot-security2-demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>spring-boot-security2-demo</name>
    <description>Spring Boot集成Spring Security样例</description>

    <properties>
        <java.version>8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
    </dependencies>

</project>

三、查看自动装配配置类

1. 查看Security Servlet相关自动装配配置类
   

四、自动装配配置类之SecurityAutoConfiguration

1、SecurityAutoConfiguration部分源码

@AutoConfiguration
@ConditionalOnClass(DefaultAuthenticationEventPublisher.class)
@EnableConfigurationProperties(SecurityProperties.class)
@Import({ SpringBootWebSecurityConfiguration.class, SecurityDataConfiguration.class })
public class SecurityAutoConfiguration {

	@Bean
	@ConditionalOnMissingBean(AuthenticationEventPublisher.class)
	public DefaultAuthenticationEventPublisher authenticationEventPublisher(ApplicationEventPublisher publisher) {
		return new DefaultAuthenticationEventPublisher(publisher);
	}

}

2、主要作用

1. 导入SpringBootWebSecurityConfiguration

3、SpringBootWebSecurityConfiguration

3.1、SpringBootWebSecurityConfiguration部分源码

@Configuration(proxyBeanMethods = false)
@ConditionalOnWebApplication(type = Type.SERVLET)
class SpringBootWebSecurityConfiguration {

	@Configuration(proxyBeanMethods = false)
	@ConditionalOnDefaultWebSecurity
	static class SecurityFilterChainConfiguration {

		@Bean
		@Order(SecurityProperties.BASIC_AUTH_ORDER)
		SecurityFilterChain defaultSecurityFilterChain(HttpSecurity http) throws Exception {
			http.authorizeRequests().anyRequest().authenticated();
			http.formLogin();
			http.httpBasic();
			return http.build();
		}

	}

	@Configuration(proxyBeanMethods = false)
	@ConditionalOnMissingBean(name = BeanIds.SPRING_SECURITY_FILTER_CHAIN)
	@ConditionalOnClass(EnableWebSecurity.class)
	@EnableWebSecurity
	static class WebSecurityEnablerConfiguration {

	}

}

3.2、主要作用

1. 默认Security配置（Spring容器中没有SecurityFilterChain和WebSecurityConfigurerAdapter）时，向Spring容器中注入默认过滤器链，即用户没有自定义过滤器链时，生成默认过滤器链
   
2. Spring容器中不存在名称为springSecurityFilterChain对象时，启用WebSecurity，即用户未显示的启用WebSecurity时，隐式的启用WebSecurity
   

4、@EnableWebSecurity

4.1、部分源码

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
@Documented
@Import({ WebSecurityConfiguration.class, SpringWebMvcImportSelector.class, OAuth2ImportSelector.class,
		HttpSecurityConfiguration.class })
@EnableGlobalAuthentication
@Configuration
public @interface EnableWebSecurity {

	/**
	 * Controls debugging support for Spring Security. Default is false.
	 * @return if true, enables debug support with Spring Security
	 */
	boolean debug() default false;

}

4.2、主要作用

1. 导入WebSecurityConfiguration
2. 导入HttpSecurityConfiguration

5、WebSecurityConfiguration

5.1、部分源码

@Configuration(proxyBeanMethods = false)
public class WebSecurityConfiguration implements ImportAware, BeanClassLoaderAware {
@Bean(name = AbstractSecurityWebApplicationInitializer.DEFAULT_FILTER_NAME)
	public Filter springSecurityFilterChain() throws Exception {
		boolean hasConfigurers = this.webSecurityConfigurers != null && !this.webSecurityConfigurers.isEmpty();
		boolean hasFilterChain = !this.securityFilterChains.isEmpty();
		Assert.state(!(hasConfigurers && hasFilterChain),
				"Found WebSecurityConfigurerAdapter as well as SecurityFilterChain. Please select just one.");
		if (!hasConfigurers && !hasFilterChain) {
			WebSecurityConfigurerAdapter adapter = this.objectObjectPostProcessor
					.postProcess(new WebSecurityConfigurerAdapter() {
					});
			this.webSecurity.apply(adapter);
		}
		for (SecurityFilterChain securityFilterChain : this.securityFilterChains) {
			this.webSecurity.addSecurityFilterChainBuilder(() -> securityFilterChain);
			for (Filter filter : securityFilterChain.getFilters()) {
				if (filter instanceof FilterSecurityInterceptor) {
					this.webSecurity.securityInterceptor((FilterSecurityInterceptor) filter);
					break;
				}
			}
		}
		for (WebSecurityCustomizer customizer : this.webSecurityCustomizers) {
			customizer.customize(this.webSecurity);
		}
		return this.webSecurity.build();
	}
}

5.2、主要作用

1. 根据配置的SecurityFilterChain集合构建springSecurityFilterChain对象并注入到Spring容器中

6、HttpSecurityConfiguration

6.1、部分源码

@Configuration(proxyBeanMethods = false)
class HttpSecurityConfiguration {

	@Bean(HTTPSECURITY_BEAN_NAME)
	@Scope("prototype")
	HttpSecurity httpSecurity() throws Exception {
		WebSecurityConfigurerAdapter.LazyPasswordEncoder passwordEncoder = new WebSecurityConfigurerAdapter.LazyPasswordEncoder(
				this.context);
		AuthenticationManagerBuilder authenticationBuilder = new WebSecurityConfigurerAdapter.DefaultPasswordEncoderAuthenticationManagerBuilder(
				this.objectPostProcessor, passwordEncoder);
		authenticationBuilder.parentAuthenticationManager(authenticationManager());
		authenticationBuilder.authenticationEventPublisher(getAuthenticationEventPublisher());
		HttpSecurity http = new HttpSecurity(this.objectPostProcessor, authenticationBuilder, createSharedObjects());
		// @formatter:off
		http
			.csrf(withDefaults())
			.addFilter(new WebAsyncManagerIntegrationFilter())
			.exceptionHandling(withDefaults())
			.headers(withDefaults())
			.sessionManagement(withDefaults())
			.securityContext(withDefaults())
			.requestCache(withDefaults())
			.anonymous(withDefaults())
			.servletApi(withDefaults())
			.apply(new DefaultLoginPageConfigurer<>());
		http.logout(withDefaults());
		// @formatter:on
		applyDefaultConfigurers(http);
		return http;
	}
}

6.2、主要作用

1. Spring容器中注册HttpSecurity对象
2. httpSecurity用于配置构建自定义过滤器链

五、自动装配配置类之UserDetailsServiceAutoConfiguration

1、部分源码

@AutoConfiguration
@ConditionalOnClass(AuthenticationManager.class)
@ConditionalOnBean(ObjectPostProcessor.class)
@ConditionalOnMissingBean(
		value = { AuthenticationManager.class, AuthenticationProvider.class, UserDetailsService.class,
				AuthenticationManagerResolver.class },
		type = { "org.springframework.security.oauth2.jwt.JwtDecoder",
				"org.springframework.security.oauth2.server.resource.introspection.OpaqueTokenIntrospector",
				"org.springframework.security.oauth2.client.registration.ClientRegistrationRepository",
				"org.springframework.security.saml2.provider.service.registration.RelyingPartyRegistrationRepository" })
public class UserDetailsServiceAutoConfiguration {
	@Bean
	@Lazy
	public InMemoryUserDetailsManager inMemoryUserDetailsManager(SecurityProperties properties,
			ObjectProvider<PasswordEncoder> passwordEncoder) {
		SecurityProperties.User user = properties.getUser();
		List<String> roles = user.getRoles();
		return new InMemoryUserDetailsManager(User.withUsername(user.getName())
			.password(getOrDeducePassword(user, passwordEncoder.getIfAvailable()))
			.roles(StringUtils.toStringArray(roles))
			.build());
	}
	private String getOrDeducePassword(SecurityProperties.User user, PasswordEncoder encoder) {
		String password = user.getPassword();
		if (user.isPasswordGenerated()) {
			logger.warn(String.format(
					"%n%nUsing generated security password: %s%n%nThis generated password is for development use only. "
							+ "Your security configuration must be updated before running your application in "
							+ "production.%n",
					user.getPassword()));
		}
		if (encoder != null || PASSWORD_ALGORITHM_PATTERN.matcher(password).matches()) {
			return password;
		}
		return NOOP_PASSWORD_PREFIX + password;
	}

2、主要作用

1. 用户未自定义认证接口时，生成默认认证接口inMemoryUserDetailsManager（基于内存用户认证）
2. 生成默认名称为user，密码为随机生成的uuid（项目启动时会打印在控制台中），角色为空的用户存入内存中

#UserDetailsServiceAutoConfiguration.inMemoryUserDetailsManager方法中获取user对象
SecurityProperties.User user = properties.getUser();
#SecurityProperties中的User类
public static class User {
		private String name = "user";
		private String password = UUID.randomUUID().toString();
		private List<String> roles = new ArrayList<>();
	}

3. 通过配置文件可以修改默认用户名、密码、角色（示例如下）
   

六、自动装配配置类之SecurityFilterAutoConfiguration

1、部分源码

@AutoConfiguration(after = SecurityAutoConfiguration.class)
@ConditionalOnWebApplication(type = Type.SERVLET)
@EnableConfigurationProperties(SecurityProperties.class)
@ConditionalOnClass({ AbstractSecurityWebApplicationInitializer.class, SessionCreationPolicy.class })
public class SecurityFilterAutoConfiguration {

	private static final String DEFAULT_FILTER_NAME = AbstractSecurityWebApplicationInitializer.DEFAULT_FILTER_NAME;

	@Bean
	@ConditionalOnBean(name = DEFAULT_FILTER_NAME)
	public DelegatingFilterProxyRegistrationBean securityFilterChainRegistration(
			SecurityProperties securityProperties) {
		DelegatingFilterProxyRegistrationBean registration = new DelegatingFilterProxyRegistrationBean(
				DEFAULT_FILTER_NAME);
		registration.setOrder(securityProperties.getFilter().getOrder());
		registration.setDispatcherTypes(getDispatcherTypes(securityProperties));
		return registration;
	}

	private EnumSet<DispatcherType> getDispatcherTypes(SecurityProperties securityProperties) {
		if (securityProperties.getFilter().getDispatcherTypes() == null) {
			return null;
		}
		return securityProperties.getFilter()
			.getDispatcherTypes()
			.stream()
			.map((type) -> DispatcherType.valueOf(type.name()))
			.collect(Collectors.toCollection(() -> EnumSet.noneOf(DispatcherType.class)));
	}

}

2、主要作用

1. 注册DelegatingFilterProxyRegistrationBean（委托过滤器代理注册Bean）
2. 设置代理目标Bean对象名称为springSecurityFilterChain