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spring security 授权回顾
spring security 通过FilterChainProxy作为注册到web的filter,FilterChainProxy里面一次包含了内置的多个过滤器,我们首先需要了解spring security内置的各种filter:
Alias | Filter Class | Namespace Element or Attribute |
---|
CHANNEL_FILTER | ChannelProcessingFilter | http/intercept-url@requires-channel |
SECURITY_CONTEXT_FILTER | SecurityContextPersistenceFilter | http |
CONCURRENT_SESSION_FILTER | ConcurrentSessionFilter | session-management/concurrency-control |
HEADERS_FILTER | HeaderWriterFilter | http/headers |
CSRF_FILTER | CsrfFilter | http/csrf |
LOGOUT_FILTER | LogoutFilter | http/logout |
X509_FILTER | X509AuthenticationFilter | http/x509 |
PRE_AUTH_FILTER | AbstractPreAuthenticatedProcessingFilter Subclasses | N/A |
CAS_FILTER | CasAuthenticationFilter | N/A |
FORM_LOGIN_FILTER | UsernamePasswordAuthenticationFilter | http/form-login |
BASIC_AUTH_FILTER | BasicAuthenticationFilter | http/http-basic |
SERVLET_API_SUPPORT_FILTER | SecurityContextHolderAwareRequestFilter | http/@servlet-api-provision |
JAAS_API_SUPPORT_FILTER | JaasApiIntegrationFilter | http/@jaas-api-provision |
REMEMBER_ME_FILTER | RememberMeAuthenticationFilter | http/remember-me |
ANONYMOUS_FILTER | AnonymousAuthenticationFilter | http/anonymous |
SESSION_MANAGEMENT_FILTER | SessionManagementFilter | session-management |
EXCEPTION_TRANSLATION_FILTER | ExceptionTranslationFilter | http |
FILTER_SECURITY_INTERCEPTOR | FilterSecurityInterceptor | http |
SWITCH_USER_FILTER | SwitchUserFilter | N/A |
最重要的是FilterSecurityInterceptor,该过滤器实现了主要的鉴权逻辑,最核心的代码在这里:
protected InterceptorStatusToken beforeInvocation(Object object) {
// 获取访问URL所需权限
Collection attributes = this.obtainSecurityMetadataSource()
.getAttributes(object);
Authentication authenticated = authenticateIfRequired();
// 通过accessDecisionManager鉴权
try {
this.accessDecisionManager.decide(authenticated, object, attributes);
}
catch (AccessDeniedException accessDeniedException) {
publishEvent(new AuthorizationFailureEvent(object, attributes, authenticated,
accessDeniedException));
throw accessDeniedException;
}
if (debug) {
logger.debug("Authorization successful");
}
if (publishAuthorizationSuccess) {
publishEvent(new AuthorizedEvent(object, attributes, authenticated));
}
// Attempt to run as a different user
Authentication runAs = this.runAsManager.buildRunAs(authenticated, object,
attributes);
if (runAs == null) {
if (debug) {
logger.debug("RunAsManager did not change Authentication object");
}
// no further work post-invocation
return new InterceptorStatusToken(SecurityContextHolder.getContext(), false,
attributes, object);
}
else {
if (debug) {
logger.debug("Switching to RunAs Authentication: " + runAs);
}
SecurityContext origCtx = SecurityContextHolder.getContext();
SecurityContextHolder.setContext(SecurityContextHolder.createEmptyContext());
SecurityContextHolder.getContext().setAuthentication(runAs);
// need to revert to token.Authenticated post-invocation
return new InterceptorStatusToken(origCtx, true, attributes, object);
}
}
从上面可以看出,要实现动态鉴权,可以从两方面着手:
下面来看分别如何实现。
自定义AccessDecisionManager
官方的三个AccessDecisionManager都是基于AccessDecisionVoter来实现权限认证的,因此我们只需要自定义一个AccessDecisionVoter就可以了。
自定义主要是实现AccessDecisionVoter接口,我们可以仿照官方的RoleVoter实现一个:
public class RoleBasedVoter implements AccessDecisionVoter