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Topic: Spring Security 3 与 CAS单点登录配置-Client

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Topic: Spring Security 3 与 CAS单点登录配置-Client




1.Spring Security 3 与 CAS单点登录配置-Client Copy to clipboard
Posted by: netboy
Posted on: 2010-11-12 11:27

如果CAS配置完成。就可以进行Client的配置了。 
以下Client的配置前提是你对Spring Security有一定了解。如果不熟悉,还是希望能先读一下Spring Security相关的文章。 

下面是Client的Spring Security 3的最基础的配置 

1.配置<http>标签 
Xml代码 
<http auto-config="false" entry-point-ref="casEntryPoint" servlet-api-provision="true"> 
<intercept-url pattern="/manage/**" access="ROLE_ADMIN" /> 
<intercept-url pattern="/**" access="ROLE_USER,ROLE_ADMIN" /> 
<!-- logout-success-url="/login.html" --> 
<logout logout-url="/logout.html" success-handler-ref="casLogoutSuccessHandler"/> 
<custom-filter position="FORM_LOGIN_FILTER" ref="casFilter"/> 
</http> 

  <http auto-config="false" entry-point-ref="casEntryPoint" servlet-api-provision="true">
    <intercept-url pattern="/manage/**" access="ROLE_ADMIN" />
    <intercept-url pattern="/**" access="ROLE_USER,ROLE_ADMIN" />
    <!-- logout-success-url="/login.html" -->
    <logout logout-url="/logout.html" success-handler-ref="casLogoutSuccessHandler"/>
    <custom-filter position="FORM_LOGIN_FILTER" ref="casFilter"/>
  </http>

这里,重点是: 

* 不使用http的自动配置。 
* entry-point-ref="casEntryPoint"作用是认证的入口,是一个实现 AuthenticationEntryPoint接口的类。为ExceptionTranslationFilter类提供认证依据。 
* <custom-filter position="FORM_LOGIN_FILTER" ref="casFilter"/> 使用自定义的Filter,放置在过滤器链的FORM_LOGIN_FILTER的位置。 
似乎casFilter与casEntryPoint的功能有重叠。 
其实,casEntryPoint只是提供认证入口的作用,当没有权限,将跳转到该地址。 
casFilter是处理CAS service ticket的。当无权访问时,会使用casEntryPoint提供认证入口。 

2.分别配置casEntryPoint和casFilter 
配置:casEntryPoint 
Xml代码 
<beans:bean id="casEntryPoint" 
class="org.springframework.security.cas.web.CasAuthenticationEntryPoint"> 
<beans:property name="loginUrl" value="https://cas.boc.com:8443/casServer/login"/> 
<beans:property name="serviceProperties" ref="serviceProperties"/> 
</beans:bean> 
<beans:bean id="serviceProperties" class="org.springframework.security.cas.ServiceProperties"> 
<beans:property name="service" 
value="https://report.boc.com:8443/report/j_spring_cas_security_check"/> 
<beans:property name="sendRenew" value="false"/> 
</beans:bean> 

<beans:bean id="casEntryPoint"
  class="org.springframework.security.cas.web.CasAuthenticationEntryPoint">
  <beans:property name="loginUrl" value="https://cas.boc.com:8443/casServer/login"/>
  <beans:property name="serviceProperties" ref="serviceProperties"/>
</beans:bean>
<beans:bean id="serviceProperties" class="org.springframework.security.cas.ServiceProperties">
  <beans:property name="service"
  value="https://report.boc.com:8443/report/j_spring_cas_security_check"/>
<beans:property name="sendRenew" value="false"/>
</beans:bean>

配置casFilter 
Xml代码 
<beans:bean id="casFilter" 
class="org.springframework.security.cas.web.CasAuthenticationFilter"> 
<beans:property name="authenticationManager" ref="authenticationManager"/> 
</beans:bean> 

<authentication-manager alias="authenticationManager"> 
<authentication-provider ref="casAuthenticationProvider"/> 
</authentication-manager> 

<beans:bean id="userDetailsService" class="com.reportstart.security.service.impl.BocUserDetaislServiceImpl"> 
<beans:property name="userDao"> 
<beans:ref bean="userDao"/> 
</beans:property> 
</beans:bean> 

<beans:bean id="casAuthenticationUserDetailsService" class="org.springframework.security.core.userdetails.UserDetailsByNameServiceWrapper"> 
<beans:property name="userDetailsService" > 
<beans:ref local="userDetailsService"/> 
</beans:property> 
</beans:bean> 

<beans:bean id="casAuthenticationProvider" 
class="org.springframework.security.cas.authentication.CasAuthenticationProvider"> 
<beans:property name="authenticationUserDetailsService" ref="casAuthenticationUserDetailsService"/> 
<beans:property name="serviceProperties" ref="serviceProperties" /> 
<beans:property name="ticketValidator"> 
<beans:bean class="org.jasig.cas.client.validation.Cas20ServiceTicketValidator"> 
<beans:constructor-arg index="0" value="https://cas.boc.com:8443/casServer" /> 
</beans:bean> 
</beans:property> 
<beans:property name="key" value="an_id_for_this_auth_provider_only"/> 
</beans:bean> 
</beans:bean> 

<beans:bean id="casFilter"
      class="org.springframework.security.cas.web.CasAuthenticationFilter">
    <beans:property name="authenticationManager" ref="authenticationManager"/>
  </beans:bean>
  
  <authentication-manager alias="authenticationManager">
    <authentication-provider ref="casAuthenticationProvider"/>
  </authentication-manager>
  
  <beans:bean id="userDetailsService" class="com.reportstart.security.service.impl.BocUserDetaislServiceImpl">
    <beans:property name="userDao">
      <beans:ref bean="userDao"/>
    </beans:property>
  </beans:bean>

  <beans:bean id="casAuthenticationUserDetailsService" class="org.springframework.security.core.userdetails.UserDetailsByNameServiceWrapper">
    <beans:property name="userDetailsService" >
      <beans:ref local="userDetailsService"/>
    </beans:property>
  </beans:bean>

  <beans:bean id="casAuthenticationProvider"
      class="org.springframework.security.cas.authentication.CasAuthenticationProvider">
    <beans:property name="authenticationUserDetailsService" ref="casAuthenticationUserDetailsService"/>
    <beans:property name="serviceProperties" ref="serviceProperties" />
    <beans:property name="ticketValidator">
      <beans:bean class="org.jasig.cas.client.validation.Cas20ServiceTicketValidator">
       <beans:constructor-arg index="0" value="https://cas.boc.com:8443/casServer" />
   </beans:bean>
    </beans:property>
    <beans:property name="key" value="an_id_for_this_auth_provider_only"/>
  </beans:bean>
</beans:bean>

如果对Spring Security比较熟悉,就不用多说什么了。 
这里的"https://report.boc.com:8443/report/j_spring_cas_security_check"地址要注意,以后这个地址要注册到CAS service里,从而改变CAS的"open model". 
也只有这个地址是指向Client的,其他都指向Server 

最后,casLogoutSuccessHandler 
如果Client要注销,需在Client先注销,之后让Server注销提供的ticket。 
如果不这样,不论是只注销Client还是Server,注销后,系统仍然还是可以访问的。 
(按照开始的想法,注销Client,Client应该可以主动去Server去注销ticket,但是org.springframework.security.web.authentication.logout.LogoutFilter总注销自己,而不去跟Client交互。如果你知道的话,请告知。) 
CasLogoutSuccessHandler 代码 
Java代码 
package net.viiso.security.util; 

import java.io.IOException; 
import javax.servlet.ServletException; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 
import org.springframework.security.core.Authentication; 
import org.springframework.security.web.authentication.logout.LogoutSuccessHandler; 
public class CasLogoutSuccessHandler implements LogoutSuccessHandler { 

private String url = ""; 
@Override 
public void onLogoutSuccess(HttpServletRequest request, 
HttpServletResponse response, Authentication authentication) 
throws IOException, ServletException { 

if ("".equals(url)) { 
url = "https://cas.boc.com:8443/casServer/logout"; 

response.sendRedirect(url); 

public void setTargetUrl(String url) { 
this.url = url; 



package net.viiso.security.util;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.security.core.Authentication;
import org.springframework.security.web.authentication.logout.LogoutSuccessHandler;
public class CasLogoutSuccessHandler implements LogoutSuccessHandler {

  private String url = "";
  @Override
  public void onLogoutSuccess(HttpServletRequest request,
      HttpServletResponse response, Authentication authentication)
      throws IOException, ServletException {

    if ("".equals(url)) {
      url = "https://cas.boc.com:8443/casServer/logout";
    }
    response.sendRedirect(url);
  }
  public void setTargetUrl(String url) {
    this.url = url;
  }
}

启动后,对一个安全地址进行访问,会跳到CAS登录地址。 
如果登录成功,会跳至访问页。 
到此,简单的Client已经配置完成。 
接下来,还要在Server注册Client。这个虽然不是必须,但是出于安全考虑,如果CAS服务器在外网,就非常有必要对支持的Client进行注册了,因为当你访问Client在CAS登陆成功后,CAS会给你的Client提供登录者的用户信息。如果你模拟一个Client应用,使用暴力方式,不断给CAS提供用户口令和密码,会对安全性造成破坏。 
另外,也可以给CAS登录页加一个验证码。

 

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