spring security梳理

核心服务：AuthenticationManager，UserDetailsService和AccessDecisionManager

The AuthenticationManager, ProviderManager and AuthenticationProvider

AuthenticationManager是一个接口，它默认的实现类是ProviderManager，ProviderManager 并不是自己直接对请求进行验证，而是将其委派给一个AuthenticationProvider 列表。

spring-security.xml中配置

Web应用程序的安全性

The Security Filter Chain

在web.xml配置DelegatingFilterProxy。

    <filter>
        <filter-name>springSecurityFilterChain</filter-name>
        <filter-class>org.springframework.web.filter.DelegatingFilterProxy
        </filter-class>
    </filter>

    <filter-mapping>
        <filter-name>springSecurityFilterChain</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

DelegatingFilterProxy这个类本身与springsecurity无关。它的作用是充当代理，将Spring应用程序上下文中的bean委托给servlet 容器中的filter，将其关联起来。

DelegatingFilterProxy类继承于抽象类GenericFilterBean,间接地implement 了javax.servlet.Filter接口。

Servlet容器在启动时，首先会调用Filter的init方法。

GenericFilterBean的作用主要是可以把Filter的初始化参数自动地set到继承于GenericFilterBean类的Filter中去。

标准过滤器别名和顺序

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	AbstractPreAuthenticatedProcessingFilterSubclasses	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