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本文主要聊一下spring security的permitAll以及webIgnore的区别

permitAll配置实例

@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {@Overridepublic void configure(HttpSecurity http) throws Exception {http.authorizeRequests().antMatchers("/css/**", "/js/**","/fonts/**").permitAll().anyRequest().authenticated();}
}复制代码

web ignore配置实例

@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {@Overridepublic void configure(WebSecurity web) throws Exception {web.ignoring().antMatchers("/css/**");web.ignoring().antMatchers("/js/**");web.ignoring().antMatchers("/fonts/**");}
}复制代码

二者区别

顾名思义，WebSecurity主要是配置跟web资源相关的，比如css、js、images等等，但是这个还不是本质的区别，关键的区别如下：

• ingore是完全绕过了spring security的所有filter，相当于不走spring security
• permitall没有绕过spring security，其中包含了登录的以及匿名的。

AnonymousAuthenticationFilter

spring-security-web-4.2.3.RELEASE-sources.jar!/org/springframework/security/web/authentication/AnonymousAuthenticationFilter.java

/*** Detects if there is no {@code Authentication} object in the* {@code SecurityContextHolder}, and populates it with one if needed.** @author Ben Alex* @author Luke Taylor*/
public class AnonymousAuthenticationFilter extends GenericFilterBean implementsInitializingBean {//......public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)throws IOException, ServletException {if (SecurityContextHolder.getContext().getAuthentication() == null) {SecurityContextHolder.getContext().setAuthentication(createAuthentication((HttpServletRequest) req));if (logger.isDebugEnabled()) {logger.debug("Populated SecurityContextHolder with anonymous token: '"+ SecurityContextHolder.getContext().getAuthentication() + "'");}}else {if (logger.isDebugEnabled()) {logger.debug("SecurityContextHolder not populated with anonymous token, as it already contained: '"+ SecurityContextHolder.getContext().getAuthentication() + "'");}}chain.doFilter(req, res);}protected Authentication createAuthentication(HttpServletRequest request) {AnonymousAuthenticationToken auth = new AnonymousAuthenticationToken(key,principal, authorities);auth.setDetails(authenticationDetailsSource.buildDetails(request));return auth;}//......
}复制代码

这个filter的主要功能就是给没有登陆的用户，填充AnonymousAuthenticationToken到SecurityContextHolder的Authentication，后续依赖Authentication的代码可以统一处理。

FilterComparator

spring-security-config-4.1.4.RELEASE-sources.jar!/org/springframework/security/config/annotation/web/builders/FilterComparator.java

final class FilterComparator implements Comparator<Filter>, Serializable {private static final int STEP = 100;private Map<String, Integer> filterToOrder = new HashMap<String, Integer>();FilterComparator() {int order = 100;put(ChannelProcessingFilter.class, order);order += STEP;put(ConcurrentSessionFilter.class, order);order += STEP;put(WebAsyncManagerIntegrationFilter.class, order);order += STEP;put(SecurityContextPersistenceFilter.class, order);order += STEP;put(HeaderWriterFilter.class, order);order += STEP;put(CorsFilter.class, order);order += STEP;put(CsrfFilter.class, order);order += STEP;put(LogoutFilter.class, order);order += STEP;put(X509AuthenticationFilter.class, order);order += STEP;put(AbstractPreAuthenticatedProcessingFilter.class, order);order += STEP;filterToOrder.put("org.springframework.security.cas.web.CasAuthenticationFilter",order);order += STEP;put(UsernamePasswordAuthenticationFilter.class, order);order += STEP;put(ConcurrentSessionFilter.class, order);order += STEP;filterToOrder.put("org.springframework.security.openid.OpenIDAuthenticationFilter", order);order += STEP;put(DefaultLoginPageGeneratingFilter.class, order);order += STEP;put(ConcurrentSessionFilter.class, order);order += STEP;put(DigestAuthenticationFilter.class, order);order += STEP;put(BasicAuthenticationFilter.class, order);order += STEP;put(RequestCacheAwareFilter.class, order);order += STEP;put(SecurityContextHolderAwareRequestFilter.class, order);order += STEP;put(JaasApiIntegrationFilter.class, order);order += STEP;put(RememberMeAuthenticationFilter.class, order);order += STEP;put(AnonymousAuthenticationFilter.class, order);order += STEP;put(SessionManagementFilter.class, order);order += STEP;put(ExceptionTranslationFilter.class, order);order += STEP;put(FilterSecurityInterceptor.class, order);order += STEP;put(SwitchUserFilter.class, order);}//......
}复制代码

这个类定义了spring security内置的filter的优先级，AnonymousAuthenticationFilter在倒数第五个执行，在FilterSecurityInterceptor这个类之前。

FilterSecurityInterceptor

spring-security-web-4.2.3.RELEASE-sources.jar!/org/springframework/security/web/access/intercept/FilterSecurityInterceptor.java

/*** Performs security handling of HTTP resources via a filter implementation.* <p>* The <code>SecurityMetadataSource</code> required by this security interceptor is of* type {@link FilterInvocationSecurityMetadataSource}.* <p>* Refer to {@link AbstractSecurityInterceptor} for details on the workflow.* </p>** @author Ben Alex* @author Rob Winch*/
public class FilterSecurityInterceptor extends AbstractSecurityInterceptor implementsFilter {//......
}复制代码

这个相当于spring security的核心处理类了，它继承抽象类AbstractSecurityInterceptor

spring-security-core-4.2.3.RELEASE-sources.jar!/org/springframework/security/access/intercept/AbstractSecurityInterceptor.java

public abstract class AbstractSecurityInterceptor implements InitializingBean,ApplicationEventPublisherAware, MessageSourceAware {//......protected InterceptorStatusToken beforeInvocation(Object object) {Assert.notNull(object, "Object was null");final boolean debug = logger.isDebugEnabled();if (!getSecureObjectClass().isAssignableFrom(object.getClass())) {throw new IllegalArgumentException("Security invocation attempted for object "+ object.getClass().getName()+ " but AbstractSecurityInterceptor only configured to support secure objects of type: "+ getSecureObjectClass());}Collection<ConfigAttribute> attributes = this.obtainSecurityMetadataSource().getAttributes(object);if (attributes == null || attributes.isEmpty()) {if (rejectPublicInvocations) {throw new IllegalArgumentException("Secure object invocation "+ object+ " was denied as public invocations are not allowed via this interceptor. "+ "This indicates a configuration error because the "+ "rejectPublicInvocations property is set to 'true'");}if (debug) {logger.debug("Public object - authentication not attempted");}publishEvent(new PublicInvocationEvent(object));return null; // no further work post-invocation}if (debug) {logger.debug("Secure object: " + object + "; Attributes: " + attributes);}if (SecurityContextHolder.getContext().getAuthentication() == null) {credentialsNotFound(messages.getMessage("AbstractSecurityInterceptor.authenticationNotFound","An Authentication object was not found in the SecurityContext"),object, attributes);}Authentication authenticated = authenticateIfRequired();// Attempt authorizationtry {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 userAuthentication runAs = this.runAsManager.buildRunAs(authenticated, object,attributes);if (runAs == null) {if (debug) {logger.debug("RunAsManager did not change Authentication object");}// no further work post-invocationreturn 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-invocationreturn new InterceptorStatusToken(origCtx, true, attributes, object);}}//......
}复制代码

主要的逻辑在这个beforeInvocation方法，它就依赖了authentication

private Authentication authenticateIfRequired() {Authentication authentication = SecurityContextHolder.getContext().getAuthentication();if (authentication.isAuthenticated() && !alwaysReauthenticate) {if (logger.isDebugEnabled()) {logger.debug("Previously Authenticated: " + authentication);}return authentication;}authentication = authenticationManager.authenticate(authentication);// We don't authenticated.setAuthentication(true), because each provider should do// thatif (logger.isDebugEnabled()) {logger.debug("Successfully Authenticated: " + authentication);}SecurityContextHolder.getContext().setAuthentication(authentication);return authentication;}复制代码

这个方法判断authentication如果是已经校验过的，则返回；没有校验过的话，则调用authenticationManager进行鉴权。

而AnonymousAuthenticationFilter设置的authentication在这个时候就派上用场了
spring-security-core-4.2.3.RELEASE-sources.jar!/org/springframework/security/authentication/AnonymousAuthenticationToken.java
```
public class AnonymousAuthenticationToken extends AbstractAuthenticationToken implements
Serializable {
private AnonymousAuthenticationToken(Integer keyHash, Object principal,
Collection<? extends GrantedAuthority> authorities) {
super(authorities);

    if (principal == null || "".equals(principal)) {throw new IllegalArgumentException("principal cannot be null or empty");}Assert.notEmpty(authorities, "authorities cannot be null or empty");this.keyHash = keyHash;this.principal = principal;setAuthenticated(true);
}
//......复制代码

}
```

它默认就是authenticated

小结

• web ignore比较适合配置前端相关的静态资源，它是完全绕过spring security的所有filter的；
• 而permitAll，会给没有登录的用户适配一个AnonymousAuthenticationToken，设置到SecurityContextHolder，方便后面的filter可以统一处理authentication。

doc

• spring security 的几个细节
• Spring Security – security none, filters none, access permitAll
• Spring Security permitAll() not allowing anonymous access
• Difference between access=“permitAll” and filters=“none”?