如何在Spring Security中使用CAS

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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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