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Spring Security整合CAS

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这里使用的是spring-security和原生的jasig cas包来进行整合,为什么没有直接使用spring提供的spring-security-cas,后面会进行解释。

配置 web.xml

<filter> <filter-name>casFilterChain</filter-name> <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class> </filter> <filter-mapping> <filter-name>casFilterChain</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <listener> <listener-class>org.jasig.cas.client.session.SingleSignOutHttpSessionListener</listener-class> </listener>

applicationContext-security.xml

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:security="http://www.springframework.org/schema/security" xmlns:util="http://www.springframework.org/schema/util" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/security http://www.springframework.org/schema/security/spring-security-3.2.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd"> <bean id="casFilterChain" class="org.springframework.security.web.FilterChainProxy"> <constructor-arg> <util:list> <security:filter-chain pattern="/**" filters="singleSignOutFilter, cas20ProxyReceivingTicketValidationFilter, authenticationFilter, httpServletRequestWrapperFilter, assertionThreadLocalFilter"/> </util:list> </constructor-arg> </bean> <bean id="singleSignOutFilter" class="org.jasig.cas.client.session.SingleSignOutFilter"/> <bean id="cas20ProxyReceivingTicketValidationFilter" class="org.jasig.cas.client.validation.Cas20ProxyReceivingTicketValidationFilter"> <property name="serverName" value="${client.url}"/> <property name="ticketValidator" ref="cas20ServiceTicketValidator"/> </bean> <bean id="cas20ServiceTicketValidator" class="org.jasig.cas.client.validation.Cas20ServiceTicketValidator"> <constructor-arg value="${cas.url}"/> <property name="renew" value="false"/> </bean> <bean id="authenticationFilter" class="org.jasig.cas.client.authentication.AuthenticationFilter"> <property name="renew" value="false"/> <property name="casServerLoginUrl" value="${cas.url}"/> <property name="serverName" value="${client.url}"/> </bean> <bean id="httpServletRequestWrapperFilter" class="org.jasig.cas.client.util.HttpServletRequestWrapperFilter"/> <bean id="assertionThreadLocalFilter" class="org.jasig.cas.client.util.AssertionThreadLocalFilter"/> </beans>

properties

#CAS服务地址 cas.url=https://cas.example.com:8443 #CAS客户端地址,就是本应用的地址 client.url=http://localhost:8080

分析

在applicationContext-security.xml中的security filter chain中,我们使用了5个filter,分别是:singleSignOutFilter、cas20ProxyReceivingTicketValidationFilter、authenticationFilter、httpServletRequestWrapperFilter、assertionThreadLocalFilter。

为什么不用spring-security-cas spring-security-cas

在spring-security-cas中负责ticket validator filter使用的是org.springframework.security.cas.authentication.CasAuthenticationProvider。

private CasAuthenticationToken authenticateNow(final Authentication authentication) throws AuthenticationException { try { final Assertion assertion = this.ticketValidator.validate(authentication.getCredentials().toString(), getServiceUrl(authentication)); ...

在构建validator的validator方法的第二个参数时

private String getServiceUrl(Authentication authentication) { String serviceUrl; if(authentication.getDetails() instanceof ServiceAuthenticationDetails) { serviceUrl = ((ServiceAuthenticationDetails)authentication.getDetails()).getServiceUrl(); }else if(serviceProperties == null){ throw new IllegalStateException("serviceProperties cannot be null unless Authentication.getDetails() implements ServiceAuthenticationDetails."); }else if(serviceProperties.getService() == null){ throw new IllegalStateException("serviceProperties.getService() cannot be null unless Authentication.getDetails() implements ServiceAuthenticationDetails."); }else { serviceUrl = serviceProperties.getService(); } if(logger.isDebugEnabled()) { logger.debug("serviceUrl = "+serviceUrl); } return serviceUrl; }


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