CAS和SpringSecurity的整合

1、jar包引入

　　此处解除cas与slf4j的依赖，防止与spring的slf4j冲突

<dependency>  
       <groupId>org.springframework.security</groupId>  
       <artifactId>spring-security-cas</artifactId>  
       <version>4.1.0.RELEASE</version>  
</dependency>     
<dependency>  
        <groupId>org.jasig.cas.client</groupId>  
        <artifactId>cas-client-core</artifactId>  
        <version>3.3.3</version>  
        <exclusions>  
            <exclusion>  
                <groupId>org.slf4j</groupId>  
                <artifactId>log4j-over-slf4j</artifactId>  
            </exclusion>  
        </exclusions>  
</dependency> 

2、SpringSecurity在web.xml中的配置

<!-- springSecurity的过滤器 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring/spring-security.xml</param-value>
    </context-param>

    <listener> 
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    
    <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>

3、Spring-Security.xml的配置

<?xml version="1.0" encoding="UTF-8"?><beans:beans xmlns="http://www.springframework.org/schema/security"

xmlns:beans="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    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.xsd">
    
    <!--   entry-point-ref  入口点引用 -->
    <http use-expressions="false" entry-point-ref="casProcessingFilterEntryPoint">  
　　　　　　<!-- access:必须以ROLE_开头 -->
        <intercept-url pattern="/**" access="ROLE_USER"/>   
　　　　　　<!-- 关闭csrf:关闭防止盗链 -->
        <csrf disabled="true"/>  
　　　　

　　　　　　<!-- 将前端框架放行，避免404 -->
　　　　　　<headers>
　　　　　　<frame-options policy="SAMEORIGIN"/>
　　　　　　</headers>

        <!-- custom-filter为过滤器， position 表示将过滤器放在指定的位置上(参照位置表)，before表示放在指定位置之前  ，after表示放在指定的位置之后  -->           
        <custom-filter ref="casAuthenticationFilter"  position="CAS_FILTER" />      
        <custom-filter ref="requestSingleLogoutFilter" before="LOGOUT_FILTER"/>  
        <custom-filter ref="singleLogoutFilter" before="CAS_FILTER"/>  
    </http>
    
      <!-- CAS入口点 开始 -->
    <beans:bean id="casProcessingFilterEntryPoint" class="org.springframework.security.cas.web.CasAuthenticationEntryPoint">  
        <!-- 单点登录服务器登录URL -->  
        <beans:property name="loginUrl" value="http://localhost:9100/cas/login"/>  
        <beans:property name="serviceProperties" ref="serviceProperties"/>  
    </beans:bean>      
    <beans:bean id="serviceProperties" class="org.springframework.security.cas.ServiceProperties">  
        <!--service 配置自身工程的根地址+/login/cas   -->  
        <beans:property name="service" value="http://localhost:9003/login/cas"/>
    </beans:bean>  
    <!-- CAS入口点 结束 -->
   
    <!-- 认证过滤器 开始 -->
    <beans:bean id="casAuthenticationFilter" class="org.springframework.security.cas.web.CasAuthenticationFilter">  
        <beans:property name="authenticationManager" ref="authenticationManager"/>  
    </beans:bean>  
        <!-- 认证管理器 -->
    <authentication-manager alias="authenticationManager">
        <authentication-provider  ref="casAuthenticationProvider">
        </authentication-provider>
    </authentication-manager>
        <!-- 认证提供者 -->
    <beans:bean id="casAuthenticationProvider"     class="org.springframework.security.cas.authentication.CasAuthenticationProvider">  
        <beans:property name="authenticationUserDetailsService">  
            <beans:bean class="org.springframework.security.core.userdetails.UserDetailsByNameServiceWrapper">  
                <beans:constructor-arg ref="userDetailsService" />  
            </beans:bean>  
        </beans:property>  
        <beans:property name="serviceProperties" ref="serviceProperties"/>  
        <!-- ticketValidator 为票据验证器 -->
        <beans:property name="ticketValidator">  
            <beans:bean class="org.jasig.cas.client.validation.Cas20ServiceTicketValidator">  
                <beans:constructor-arg index="0" value="http://localhost:9100/cas"/>  
            </beans:bean>  
        </beans:property>  
        <beans:property name="key" value="an_id_for_this_auth_provider_only"/> 
    </beans:bean>        
            <!-- 认证类 -->
    <beans:bean id="userDetailsService" class="com.jd.demo.service.UserDetailServiceImpl"/>  
    
    <!-- 认证过滤器 结束 -->
    <!-- 单点登出  开始  -->     
    <beans:bean id="singleLogoutFilter" class="org.jasig.cas.client.session.SingleSignOutFilter"/>     //cas登出     
    <beans:bean id="requestSingleLogoutFilter" class="org.springframework.security.web.authentication.logout.LogoutFilter">  
        <beans:constructor-arg value="http://localhost:9100/cas/logout?service=http://www.baidu.com"/>  //security登出
        <beans:constructor-arg>  
            <beans:bean class="org.springframework.security.web.authentication.logout.SecurityContextLogoutHandler"/>  
        </beans:constructor-arg>  
        <beans:property name="filterProcessesUrl" value="/logout/cas"/>  
    </beans:bean>  
    <!-- 单点登出  结束 -->  
</beans:beans>

4、创建UserDetailsServiceImpl，在登陆后得到用户名，可以根据用户名查询角色或执行一些逻辑

public class UserDetailServiceImpl implements UserDetailsService {
    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        //构建角色集合
        List<GrantedAuthority> authorities=new ArrayList();
        authorities.add(new SimpleGrantedAuthority("ROLE_USER"));
        return new User(username, ""  , authorities);        
    }
}

　　登出的链接：<a href="/logout/cas">

5、Spring Security 内置过滤器表

别名	Filter 类
CHANNEL_FILTER	ChannelProcessingFilter
SECURITY_CONTEXT_FILTER	SecurityContextPersistenceFilter
CONCURRENT_SESSION_FILTER	ConcurrentSessionFilter
LOGOUT_FILTER	LogoutFilter
X509_FILTER	X509AuthenticationFilter
PRE_AUTH_FILTER	AstractPreAuthenticatedProcessingFilter 的子类
CAS_FILTER	CasAuthenticationFilter
FORM_LOGIN_FILTER	UsernamePasswordAuthenticationFilter
BASIC_AUTH_FILTER	BasicAuthenticationFilter
SERVLET_API_SUPPORT_FILTER	SecurityContextHolderAwareRequestFilter
JAAS_API_SUPPORT_FILTER	JaasApiIntegrationFilter
REMEMBER_ME_FILTER	RememberMeAuthenticationFilter
ANONYMOUS_FILTER	AnonymousAuthenticationFilter
SESSION_MANAGEMENT_FILTER	SessionManagementFilter
EXCEPTION_TRANSLATION_FILTER	ExceptionTranslationFilter
FILTER_SECURITY_INTERCEPTOR	FilterSecurityInterceptor
SWITCH_USER_FILTER	SwitchUserFilter