Spring Security权限控制的接口怎么实现
本篇内容主要讲解“Spring Security权限控制的接口怎么实现”,感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷,实用性强。下面就让小编来带大家学习“Spring Security权限控制的接口怎么实现”吧!
Introduction
认证过程中会一并获得用户权限,Authentication#getAuthorities
接口方法提供权限,认证过后即是鉴权,Spring Security使用GrantedAuthority
接口代表权限。早期版本在FilterChain
中使用FilterSecurityInterceptor
中执行鉴权过程,现使用AuthorizationFilter
执行,开始执行顺序两者一致,此外,Filter
中具体实现也由 AccessDecisionManager
+ AccessDecisionVoter
变为 AuthorizationManager
本文关注新版本的实现:AuthorizationFilter
和AuthorizationManager
。
AuthorizationManager
最常用的实现类为RequestMatcherDelegatingAuthorizationManager
,其中会根据你的配置生成一系列RequestMatcherEntry
,每个entry中包含一个匹配器RequestMatcher
和泛型类被匹配对象。
UML类图结构如下:
另外,对于 method security ,实现方式主要为AOP+Spring EL,常用权限方法注解为:
@EnableMethodSecurity
@PreAuthorize
@PostAuthorize
@PreFilter
@PostFilter
@Secured
这些注解可以用在controller方法上用于权限控制,注解中填写Spring EL表述权限信息。这些注解一起使用时的执行顺序由枚举类AuthorizationInterceptorsOrder
控制:
public enum AuthorizationInterceptorsOrder {FIRST(Integer.MIN_VALUE),PRE_FILTER,PRE_AUTHORIZE,SECURED,JSR250,POST_AUTHORIZE,POST_FILTER,LAST(Integer.MAX_VALUE);...}
而这些权限注解的提取和配置主要由org.springframework.security.config.annotation.method.configuration
包下的几个配置类完成:
PrePostMethodSecurityConfiguration
SecuredMethodSecurityConfiguration
等
权限配置
权限配置可以通过两种方式配置:
SecurityFilterChain
配置类配置@EnableMethodSecurity
开启方法上注解配置
下面是关于SecurityFilterChain的权限配置,以及method security使用
@Configuration// 其中prepostEnabled默认true,其他注解配置默认false,需手动改为true@EnableMethodSecurity(securedEnabled = true)@RequiredArgsConstructorpublic class SecurityConfig {// 白名单private static final String[] AUTH_WHITELIST = ... @Bean public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception { // antMatcher or mvcMatcher http.authorizeHttpRequests() .antMatchers(AUTH_WHITELIST).permitAll() // hasRole中不需要添加 ROLE_前缀 // ant 匹配 /admin /admin/a /admin/a/b 都会匹配上 .antMatchers("/admin @PreAuthorize("hasRole('ADMIN')") @GetMapping("/admin") public ResponseEntity<Map<String, Object>> admin() { return ResponseEntity.ok(Collections.singletonMap("msg","u r admin")); }}
源码
配置类权限控制
AuthorizationFilter
public class AuthorizationFilter extends OncePerRequestFilter {// 在配置类中默认实现为 RequestMatcherDelegatingAuthorizationManagerprivate final AuthorizationManager<HttpServletRequest> authorizationManager;@Overrideprotected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)throws ServletException, IOException {// 委托给AuthorizationManagerAuthorizationDecision decision = this.authorizationManager.check(this::getAuthentication, request);if (decision != null && !decision.isGranted()) {throw new AccessDeniedException("Access Denied");}filterChain.doFilter(request, response);}}
来看看AuthorizationManager
默认实现RequestMatcherDelegatingAuthorizationManager
:
public final class RequestMatcherDelegatingAuthorizationManager implements AuthorizationManager<HttpServletRequest> {// http.authorizeHttpRequests().antMatchers(AUTH_WHITELIST)...// SecurityFilterChain中每配置一项就会增加一个Entry// RequestMatcherEntry包含一个RequestMatcher和一个待鉴权对象,这里是AuthorizationManagerprivate final List<RequestMatcherEntry<AuthorizationManager<RequestAuthorizationContext>>> mappings;...@Overridepublic AuthorizationDecision check(Supplier<Authentication> authentication, HttpServletRequest request) {for (RequestMatcherEntry<AuthorizationManager<RequestAuthorizationContext>> mapping : this.mappings) {RequestMatcher matcher = mapping.getRequestMatcher();MatchResult matchResult = matcher.matcher(request);if (matchResult.isMatch()) {AuthorizationManager<RequestAuthorizationContext> manager = mapping.getEntry();return manager.check(authentication,new RequestAuthorizationContext(request, matchResult.getVariables()));}}return null;}}
方法权限控制
总的实现基于 AOP + Spring EL
以案例中 @PreAuthorize
注解的源码为例
PrePostMethodSecurityConfiguration
@Configuration(proxyBeanMethods = false)@Role(BeanDefinition.ROLE_INFRASTRUCTURE)final class PrePostMethodSecurityConfiguration {private final AuthorizationManagerBeforeMethodInterceptor preAuthorizeAuthorizationMethodInterceptor;private final PreAuthorizeAuthorizationManager preAuthorizeAuthorizationManager = new PreAuthorizeAuthorizationManager();private final DefaultMethodSecurityExpressionHandler expressionHandler = new DefaultMethodSecurityExpressionHandler();...@AutowiredPrePostMethodSecurityConfiguration(ApplicationContext context) {// 设置 Spring EL 解析器this.preAuthorizeAuthorizationManager.setExpressionHandler(this.expressionHandler);// 拦截@PreAuthorize方法this.preAuthorizeAuthorizationMethodInterceptor = AuthorizationManagerBeforeMethodInterceptor.preAuthorize(this.preAuthorizeAuthorizationManager);...}...}
AuthorizationManagerBeforeMethodInterceptor
基于AOP实现
public final class AuthorizationManagerBeforeMethodInterceptorimplements Ordered, MethodInterceptor, PointcutAdvisor, AopInfrastructureBean {public static AuthorizationManagerBeforeMethodInterceptor preAuthorize() {// 针对 @PreAuthorize注解提供的AuthorizationManager为PreAuthorizeAuthorizationManagerreturn preAuthorize(new PreAuthorizeAuthorizationManager());}public static AuthorizationManagerBeforeMethodInterceptor preAuthorize(PreAuthorizeAuthorizationManager authorizationManager) {AuthorizationManagerBeforeMethodInterceptor interceptor = new AuthorizationManagerBeforeMethodInterceptor(AuthorizationMethodPointcuts.forAnnotations(PreAuthorize.class), authorizationManager);interceptor.setOrder(AuthorizationInterceptorsOrder.PRE_AUTHORIZE.getOrder());return interceptor;}...// 实现MethodInterceptor方法,在调用实际方法是会首先触发这个@Overridepublic Object invoke(MethodInvocation mi) throws Throwable {// 先鉴权attemptAuthorization(mi);// 后执行实际方法return mi.proceed();}private void attemptAuthorization(MethodInvocation mi) {// 判断, @PreAuthorize方法用的manager就是// PreAuthorizeAuthorizationManager// 是通过上面的static类构造的AuthorizationDecision decision = this.authorizationManager.check(AUTHENTICATION_SUPPLIER, mi);if (decision != null && !decision.isGranted()) {throw new AccessDeniedException("Access Denied");}...}static final Supplier<Authentication> AUTHENTICATION_SUPPLIER = () -> {Authentication authentication = SecurityContextHolder.getContext().getAuthentication();if (authentication == null) {throw new AuthenticationCredentialsNotFoundException("An Authentication object was not found in the SecurityContext");}return authentication;};}
针对@PreAuthorize
方法用的manager就是 PreAuthorizeAuthorizationManager#check
,下面来看看
PreAuthorizeAuthorizationManager
public final class PreAuthorizeAuthorizationManager implements AuthorizationManager<MethodInvocation> {private final PreAuthorizeExpressionAttributeRegistry registry = new PreAuthorizeExpressionAttributeRegistry();private MethodSecurityExpressionHandler expressionHandler = new DefaultMethodSecurityExpressionHandler();@Overridepublic AuthorizationDecision check(Supplier<Authentication> authentication, MethodInvocation mi) {// 获取方法上@PreAuthorize注解中的Spring EL 表达式属性ExpressionAttribute attribute = this.registry.getAttribute(mi);if (attribute == ExpressionAttribute.NULL_ATTRIBUTE) {return null;}// Spring EL 的 contextEvaluationContext ctx = this.expressionHandler.createEvaluationContext(authentication.get(), mi);// 执行表达式中结果, 会执行SecurityExpressionRoot类中对应方法。涉及Spring EL执行原理,passboolean granted = ExpressionUtils.evaluateAsBoolean(attribute.getExpression(), ctx);// 返回结果return new ExpressionAttributeAuthorizationDecision(granted, attribute);}}
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