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Spring Security整合CAS

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;
}

原文 http://atbug.com/spring-security-integrated-with-cas/

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