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【转】Spring_Security_3应用的11个步骤

阅读更多
1.Spring Security

11个步骤为应用程序添加安全防护

2. 历史与现状
自2003年出现的Spring扩展插件Acegi Security发展而来。
目前最新 版本为3.x,已成为Spring的一部分。
为J2EE企业应用程序提供可靠的安全性服务。

3.Authentication vs. Authorization
区分概念验证与授权
验证
这 个用户是谁?
用户身份可靠吗?
授权
某用户A是否可以访问资源R
某用户A是否可以执行M操作
某用户A是否可以对资 源R执行M操作

4.SS中的验证特点
支持多种验证方式
支持多种加密格式
支持组件的扩展和替换
可以本地化 输出信息

5.SS中的授权特点
支持多种仲裁方式
支持组件的扩展和替换
支持对页面访问、方法访问、对象访问 的授权。

6.SS核心安全实现
Web安全
通过配置Servlet Filter激活SS中的过滤器链
实现 Session一致性验证
实现免登陆验证(Remember-Me验证)
提供一系列标签库进行页面元素的安全控制
方法安全
通 过AOP模式实现安全代理
Web安全与方法安全均可以使用表达式语言定义访问规则

7.配置SS
配置Web.xml,应用安全过滤器
配置Spring,验证与授权部分
在web页面 中获取用户身份
在web页面中应用安全标签库

实现方法级安全

8.配置web.xml
Xml代码  收藏代码

   1. <filter>     
   2. <filter-name>springSecurityFilterChain</filter-name>     
   3. <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>     
   4. </filter>     
   5. <filter-mapping>     
   6. <filter-name>springSecurityFilterChain</filter-name>     
   7. <url-pattern>/*</url-pattern>     
   8. </filter-mapping>     
   9. <context-param>     
  10. <param-name>contextConfigLocation</param-name>     
  11. <param-value>classpath:spring.xml</param-value>     
  12. </context-param>     
  13. <listener>     
  14. <listener-class>     
  15. org.springframework.web.context.ContextLoaderListener     
  16. </listener-class>     
  17. </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>   
<context-param>   
<param-name>contextConfigLocation</param-name>   
<param-value>classpath:spring.xml</param-value>   
</context-param>   
<listener>   
<listener-class>   
org.springframework.web.context.ContextLoaderListener   
</listener-class>   
</listener>   



9.Spring配置文件中设置命名空间
Xml代码  收藏代码

   1. <?xml version="1.0" encoding="UTF-8"?>     
   2. <beans:beansxmlnsbeans:beansxmlns="http://www.springframework.org/schema/security"     
   3. xmlns:beans="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"     
   4. xsi:schemaLocation="http://www.springframework.org/schema/beans     
   5. http://www.springframework.org/schema/beans/spring-beans-3.0.xsd     
   6. http://www.springframework.org/schema/security     
   7. http://www.springframework.org/schema/security/spring-security-3.0.xsd">     
   8. </beans:beans>   

<?xml version="1.0" encoding="UTF-8"?>   
<beans:beansxmlns="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-3.0.xsd   
http://www.springframework.org/schema/security   
http://www.springframework.org/schema/security/spring-security-3.0.xsd">   
</beans:beans> 



10.配置最基本的验证与授权
Xml代码  收藏代码

   1. <http auto-config="true">     
   2. <intercept-url pattern="/**" access="ROLE_USER" />     
   3. </http>     
   4. <authentication-manager>     
   5. <authentication-provider>     
   6. <user-service>     
   7. <user name="tom" password="123" authorities="ROLE_USER, ROLE_A" />     
   8. <user name="jerry" password="123" authorities="ROLE_USER, ROLE_B" />     
   9. </user-service>     
  10. </authentication-provider>     
  11. </authentication-manager>   

<http auto-config="true">   
<intercept-url pattern="/**" access="ROLE_USER" />   
</http>   
<authentication-manager>   
<authentication-provider>   
<user-service>   
<user name="tom" password="123" authorities="ROLE_USER, ROLE_A" />   
<user name="jerry" password="123" authorities="ROLE_USER, ROLE_B" />   
</user-service>   
</authentication-provider>   
</authentication-manager> 

 

11.通过数据库验证用户身份
Xml代码  收藏代码

   1. <authentication-manager>     
   2. <authentication-provider>     
   3. <password-encoder hash=“md5”/>     
   4. <jdbc-user-service data-source-ref="dataSource"/>     
   5. </authentication-provider>     
   6. </authentication-manager>  

<authentication-manager>   
<authentication-provider>   
<password-encoder hash=“md5”/>   
<jdbc-user-service data-source-ref="dataSource"/>   
</authentication-provider>   
</authentication-manager>



数据表结构见SS说明手册附录A

12.完善web页面验证规则
Html代码  收藏代码

   1. <http auto-config="true">     
   2. <intercept-url pattern="/js/**" filters="none"/>     
   3. <intercept-url pattern="/css/**" filters="none"/>     
   4. <intercept-url pattern="/images/**" filters="none"/>     
   5. <intercept-url pattern="/a.jsp" access="ROLE_A" />     
   6. <intercept-url pattern="/b.jsp" access="ROLE_B" />     
   7. <intercept-url pattern="/c.jsp" access="ROLE_A, ROLE_B" />     
   8. <intercept-url pattern="/**" access="ROLE_USER" />     
   9. </http>   

<http auto-config="true">   
<intercept-url pattern="/js/**" filters="none"/>   
<intercept-url pattern="/css/**" filters="none"/>   
<intercept-url pattern="/images/**" filters="none"/>   
<intercept-url pattern="/a.jsp" access="ROLE_A" />   
<intercept-url pattern="/b.jsp" access="ROLE_B" />   
<intercept-url pattern="/c.jsp" access="ROLE_A, ROLE_B" />   
<intercept-url pattern="/**" access="ROLE_USER" />   
</http> 

 

13.自定义验证配置
Xml代码  收藏代码

   1. <!-- 指 定登陆页面、成功页面、失败页面-->     
   2. <form-login login-page="/login.jsp" default-target-url="/index.jsp" authentication-failure-url="/login.jsp" />     
   3. <!-- 尝 试访问没有权限的页面时跳转的页面 -->     
   4. <access-denied-handler error-page="/accessDenied.jsp"/>     
   5. <!-- 使 用记住用户名、密码功能,指定数据源和加密的key -->     
   6. <remember-me data-source-ref="dataSource" />     
   7. <!-- logout 页面,logout后清除session -->     
   8. <logout invalidate-session="true" logout-success-url="/login.jsp" />     
   9. <!-- session 失 效后跳转的页面,最大登陆次数 -->     
  10. <session-management invalid-session-url="/sessionTimeout.htm">     
  11. <concurrency-control max-sessions="1" expired-url="/sessionTimeout.htm" />     
  12. </session-management>     
  13. </http>   

<!-- 指 定登陆页面、成功页面、失败页面-->   
<form-login login-page="/login.jsp" default-target-url="/index.jsp" authentication-failure-url="/login.jsp" />   
<!-- 尝 试访问没有权限的页面时跳转的页面 -->   
<access-denied-handler error-page="/accessDenied.jsp"/>   
<!-- 使 用记住用户名、密码功能,指定数据源和加密的key -->   
<remember-me data-source-ref="dataSource" />   
<!-- logout 页面,logout后清除session -->   
<logout invalidate-session="true" logout-success-url="/login.jsp" />   
<!-- session 失 效后跳转的页面,最大登陆次数 -->   
<session-management invalid-session-url="/sessionTimeout.htm">   
<concurrency-control max-sessions="1" expired-url="/sessionTimeout.htm" />   
</session-management>   
</http> 

 

可以使用SS自带的登陆页面作为login.jsp的模板 

14.本地化消息输出
拷贝本地化资源文件后,在配置文件中加载该文件:
Xml代码  收藏代码

   1. <!-- 加载错误信息资源文件 -->     
   2. <beans:bean id="messageSource"      
   3. class="org.springframework.context.support.ReloadableResourceBundleMessageSource">     
   4. <beans:property name="basename" value="classpath:messages"/>     
   5. </beans:bean>  

<!-- 加载错误信息资源文件 -->   
<beans:bean id="messageSource"    
class="org.springframework.context.support.ReloadableResourceBundleMessageSource">   
<beans:property name="basename" value="classpath:messages"/>   
</beans:bean>

  

资 源文件在SS核心包:spring-security-core-3.0.2.RELEASE.jar的orgspringframeworksecurity目录 中

15.在web页面中获取用户信息
方式 一:Java代码  
Java代码  收藏代码

   1. Authentication auth = SecurityContextHolder.getContext().getAuthentication();     
   2. Collection<GrantedAuthority> col = auth.getAuthorities();    

Authentication auth = SecurityContextHolder.getContext().getAuthentication();   
Collection<GrantedAuthority> col = auth.getAuthorities();  



方 式二:标签库  
Html代码  收藏代码

   1. <%@ taglib prefix="sec" uri="http://www.springframework.org/security/tags" %>     
   2. <sec:authentication property="name“/>     
   3. <sec:authentication property="authorities“/>  

<%@ taglib prefix="sec" uri="http://www.springframework.org/security/tags" %>   
<sec:authentication property="name“/>   
<sec:authentication property="authorities“/>



16.在web页面进行元素安全控制
方式一  
Html代码  收藏代码

   1. <sec:authorizeifAnyGrantedsec:authorizeifAnyGranted="ROLE_A">     
   2.     <a href="a.jsp">你可以访问a.jsp</a>     
   3. </sec:authorize>     
   4. <sec:authorizeifNotGrantedsec:authorizeifNotGranted="ROLE_A">     
   5.    你不可以访问a.jsp     
   6. </sec:authorize>     

<sec:authorizeifAnyGranted="ROLE_A">   
    <a href="a.jsp">你可以访问a.jsp</a>   
</sec:authorize>   
<sec:authorizeifNotGranted="ROLE_A">   
   你不可以访问a.jsp   
</sec:authorize>   



方式二  
Html代码  收藏代码

   1. <sec:authorizeurlsec:authorizeurl="/a.jsp">     
   2.   <a href="a.jsp">你可以访问a.jsp</a>     
   3. </sec:authorize>   

<sec:authorizeurl="/a.jsp">   
  <a href="a.jsp">你可以访问a.jsp</a>   
</sec:authorize> 

 

17.全局方法安全控制
Xml代码  收藏代码

   1. <global-method-security pre-post-annotations="enabled">     
   2. <protect-pointcut expression="execution(* com.xasxt.*Service.add*(..))" access="ROLE_A"/>     
   3. <protect-pointcut expression="execution(* com.xasxt.*Service.delete*(..))" access="ROLE_B"/>     
   4. </global-method-security>   

<global-method-security pre-post-annotations="enabled">   
<protect-pointcut expression="execution(* com.xasxt.*Service.add*(..))" access="ROLE_A"/>   
<protect-pointcut expression="execution(* com.xasxt.*Service.delete*(..))" access="ROLE_B"/>   
</global-method-security> 



此 处使用了AspectJ中常用的切入点表达式(百度:AspectJ execution)

18.使用注解进行方法安全控制
Java代码  收藏代码

   1. public class DemoService {     
   2. @PreAuthorize("hasRole(&apos;ROLE_A&apos;)")     
   3. public void methodA() {     
   4. }     
   5. @PreAuthorize("hasAnyRole(&apos;ROLE_A, ROLE_B&apos;)")     
   6. public void methodB() {     
   7. }     
   8. }    

public class DemoService {   
@PreAuthorize("hasRole(&apos;ROLE_A&apos;)")   
public void methodA() {   
}   
@PreAuthorize("hasAnyRole(&apos;ROLE_A, ROLE_B&apos;)")   
public void methodB() {   
}   
}  


hasRole 与hasAnyRole为SS通用内置表达式(google : spring security Common Built- In Expressions)  

下一步做什么???
采用更安全的验证方式
采用安全的数据传输方式
实现动态授权
自 定义验证与授权部件
实现数据级安全

本Blog所有内容不得随意转载,版权属于作者所有。如需转载请与作者联系( fastzch@163.com    QQ:9184314)。
未经许可的转载,本人保留一切法律权益。
一直以来,发现有某些人完全不尊重我的劳动成果,随意转载,提醒一下那些人小心哪天惹上官司。


Spring Security 3.x 出来一段时间了,跟Acegi是大不同了,与2.x的版本也有一些小小的区别,网上有一些文档,也有人翻译Spring Security 3.x的guide,但通过阅读guide,无法马上就能很容易的实现一个完整的实例。

我花了点儿时间,根据以前的实战经验,整理了一份完整的入门教程,供需要的朋友们参考。

1,建一个web project,并导入所有需要的lib,这步就不多讲了。

2,配置web.xml,使用Spring的机制装载:
Xml代码  收藏代码

   1. <?xml version="1.0" encoding="UTF-8"?>  
   2.  <web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"  
   3.      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
   4.      xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee   
   5.      http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">  
   6.      <context-param>  
   7.          <param-name>contextConfigLocation</param-name>  
   8.          <param-value>classpath:applicationContext*.xml</param-value>  
   9.      </context-param>  
  10.    
  11.      <listener>  
  12.          <listener-class>  
  13.              org.springframework.web.context.ContextLoaderListener  
  14.          </listener-class>  
  15.      </listener>  
  16.    
  17.      <filter>  
  18.          <filter-name>springSecurityFilterChain</filter-name>  
  19.          <filter-class>  
  20.              org.springframework.web.filter.DelegatingFilterProxy  
  21.          </filter-class>  
  22.      </filter>  
  23.      <filter-mapping>  
  24.          <filter-name>springSecurityFilterChain</filter-name>  
  25.          <url-pattern>/*</url-pattern>  
  26.      </filter-mapping>  
  27.    
  28.    
  29.      <welcome-file-list>  
  30.          <welcome-file>login.jsp</welcome-file>  
  31.      </welcome-file-list>  
  32.  </web-app>  

<?xml version="1.0" encoding="UTF-8"?>
 <web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
     http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
     <context-param>
         <param-name>contextConfigLocation</param-name>
         <param-value>classpath:applicationContext*.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>
 
 
     <welcome-file-list>
         <welcome-file>login.jsp</welcome-file>
     </welcome-file-list>
 </web-app>



这个文件中的内容我相信大家都很熟悉了,不再多说了。

来看看applicationContext-security.xml这个配置文件,关于Spring Security的配置均在其中:

Xml代码  收藏代码

   1. <?xml version="1.0" encoding="UTF-8"?>  
   2.  <beans:beans xmlns="http://www.springframework.org/schema/security"  
   3.      xmlns:beans="http://www.springframework.org/schema/beans"  
   4.      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
   5.      xsi:schemaLocation="http://www.springframework.org/schema/beans  
   6.             http://www.springframework.org/schema/beans/spring-beans-3.0.xsd  
   7.             http://www.springframework.org/schema/security  
   8.             http://www.springframework.org/schema/security/spring-security-3.0.xsd">  
   9.    
  10.      <http access-denied-page="/403.jsp"><!-- 当访问被拒绝时,会转到403.jsp -->  
  11.          <intercept-url pattern="/login.jsp" filters="none" />  
  12.          <form-login login-page="/login.jsp"  
  13.              authentication-failure-url="/login.jsp?error=true"  
  14.              default-target-url="/index.jsp" />  
  15.          <logout logout-success-url="/login.jsp" />  
  16.          <http-basic />  
  17.          <!-- 增加一个filter,这点与Acegi是不一样的,不能修改默认的filter了,这个filter位于FILTER_SECURITY_INTERCEPTOR之前 -->  
  18.          <custom-filter before="FILTER_SECURITY_INTERCEPTOR"  
  19.              ref="myFilter" />  
  20.      </http>  
  21.    
  22.      <!-- 一个自定义的filter,必须包含authenticationManager,accessDecisionManager,securityMetadataSource三个属性,  
  23.      我们的所有控制将在这三个类中实现,解释详见具体配置 -->  
  24.      <beans:bean id="myFilter" class="com.robin.erp.fwk.security.MyFilterSecurityInterceptor">  
  25.          <beans:property name="authenticationManager"  
  26.              ref="authenticationManager" />  
  27.          <beans:property name="accessDecisionManager"  
  28.              ref="myAccessDecisionManagerBean" />  
  29.          <beans:property name="securityMetadataSource"  
  30.              ref="securityMetadataSource" />  
  31.      </beans:bean>  
  32.        
  33.      <!-- 认证管理器,实现用户认证的入口,主要实现UserDetailsService接口即可 -->  
  34.      <authentication-manager alias="authenticationManager">  
  35.          <authentication-provider  
  36.              user-service-ref="myUserDetailService">  
  37.              <!--   如果用户的密码采用加密的话,可以加点“盐”  
  38.                  <password-encoder hash="md5" />  
  39.              -->  
  40.          </authentication-provider>  
  41.      </authentication-manager>  
  42.      <beans:bean id="myUserDetailService"  
  43.          class="com.robin.erp.fwk.security.MyUserDetailService" />  
  44.    
  45.      <!-- 访问决策器,决定某个用户具有的角色,是否有足够的权限去访问某个资源 -->  
  46.      <beans:bean id="myAccessDecisionManagerBean"  
  47.          class="com.robin.erp.fwk.security.MyAccessDecisionManager">  
  48.      </beans:bean>  
  49.        
  50.      <!-- 资源源数据定义,即定义某一资源可以被哪些角色访问 -->  
  51.      <beans:bean id="securityMetadataSource"  
  52.          class="com.robin.erp.fwk.security.MyInvocationSecurityMetadataSource" />  
  53.    
  54.  </beans:beans>  

<?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-3.0.xsd
            http://www.springframework.org/schema/security
            http://www.springframework.org/schema/security/spring-security-3.0.xsd">
 
     <http access-denied-page="/403.jsp"><!-- 当访问被拒绝时,会转到403.jsp -->
         <intercept-url pattern="/login.jsp" filters="none" />
         <form-login login-page="/login.jsp"
             authentication-failure-url="/login.jsp?error=true"
             default-target-url="/index.jsp" />
         <logout logout-success-url="/login.jsp" />
         <http-basic />
         <!-- 增加一个filter,这点与Acegi是不一样的,不能修改默认的filter了,这个filter位于FILTER_SECURITY_INTERCEPTOR之前 -->
         <custom-filter before="FILTER_SECURITY_INTERCEPTOR"
             ref="myFilter" />
     </http>
 
     <!-- 一个自定义的filter,必须包含authenticationManager,accessDecisionManager,securityMetadataSource三个属性,
     我们的所有控制将在这三个类中实现,解释详见具体配置 -->
     <beans:bean id="myFilter" class="com.robin.erp.fwk.security.MyFilterSecurityInterceptor">
         <beans:property name="authenticationManager"
             ref="authenticationManager" />
         <beans:property name="accessDecisionManager"
             ref="myAccessDecisionManagerBean" />
         <beans:property name="securityMetadataSource"
             ref="securityMetadataSource" />
     </beans:bean>
     
     <!-- 认证管理器,实现用户认证的入口,主要实现UserDetailsService接口即可 -->
     <authentication-manager alias="authenticationManager">
         <authentication-provider
             user-service-ref="myUserDetailService">
             <!--   如果用户的密码采用加密的话,可以加点“盐”
                 <password-encoder hash="md5" />
             -->
         </authentication-provider>
     </authentication-manager>
     <beans:bean id="myUserDetailService"
         class="com.robin.erp.fwk.security.MyUserDetailService" />
 
     <!-- 访问决策器,决定某个用户具有的角色,是否有足够的权限去访问某个资源 -->
     <beans:bean id="myAccessDecisionManagerBean"
         class="com.robin.erp.fwk.security.MyAccessDecisionManager">
     </beans:bean>
     
     <!-- 资源源数据定义,即定义某一资源可以被哪些角色访问 -->
     <beans:bean id="securityMetadataSource"
         class="com.robin.erp.fwk.security.MyInvocationSecurityMetadataSource" />
 
 </beans:beans>



来看看自定义filter的实现:

Java代码  收藏代码

   1. package com.robin.erp.fwk.security;  
   2.  import java.io.IOException;  
   3.    
   4.  import javax.servlet.Filter;  
   5.  import javax.servlet.FilterChain;  
   6.  import javax.servlet.FilterConfig;  
   7.  import javax.servlet.ServletException;  
   8.  import javax.servlet.ServletRequest;  
   9.  import javax.servlet.ServletResponse;  
  10.    
  11.  import org.springframework.security.access.SecurityMetadataSource;  
  12.  import org.springframework.security.access.intercept.AbstractSecurityInterceptor;  
  13.  import org.springframework.security.access.intercept.InterceptorStatusToken;  
  14.  import org.springframework.security.web.FilterInvocation;  
  15.  import org.springframework.security.web.access.intercept.FilterInvocationSecurityMetadataSource;  
  16.    
  17.  public class MyFilterSecurityInterceptor extends AbstractSecurityInterceptor  
  18.           implements Filter {  
  19.    
  20.      private FilterInvocationSecurityMetadataSource securityMetadataSource;  
  21.    
  22.      // ~ Methods  
  23.      // ========================================================================================================  
  24.    
  25.       /** 
  26.       * Method that is actually called by the filter chain. Simply delegates to 
  27.       * the {@link #invoke(FilterInvocation)} method. 
  28.       *  
  29.       * @param request 
  30.       *            the servlet request 
  31.       * @param response 
  32.       *            the servlet response 
  33.       * @param chain 
  34.       *            the filter chain 
  35.       *  
  36.       * @throws IOException 
  37.       *             if the filter chain fails 
  38.       * @throws ServletException 
  39.       *             if the filter chain fails 
  40.       */  
  41.      public void doFilter(ServletRequest request, ServletResponse response,  
  42.               FilterChain chain) throws IOException, ServletException {  
  43.          FilterInvocation fi = new FilterInvocation(request, response, chain);  
  44.          invoke(fi);  
  45.      }  
  46.    
  47.       public FilterInvocationSecurityMetadataSource getSecurityMetadataSource() {  
  48.          return this.securityMetadataSource;  
  49.      }  
  50.    
  51.       public Class<? extends Object> getSecureObjectClass() {  
  52.          return FilterInvocation.class;  
  53.      }  
  54.    
  55.      public void invoke(FilterInvocation fi) throws IOException,  
  56.               ServletException {  
  57.          InterceptorStatusToken token = super.beforeInvocation(fi);  
  58.           try {  
  59.              fi.getChain().doFilter(fi.getRequest(), fi.getResponse());  
  60.           } finally {  
  61.              super.afterInvocation(token, null);  
  62.          }  
  63.      }  
  64.    
  65.       public SecurityMetadataSource obtainSecurityMetadataSource() {  
  66.          return this.securityMetadataSource;  
  67.      }  
  68.    
  69.      public void setSecurityMetadataSource(  
  70.               FilterInvocationSecurityMetadataSource newSource) {  
  71.          this.securityMetadataSource = newSource;  
  72.      }  
  73.    
  74.      @Override  
  75.       public void destroy() {  
  76.      }  
  77.    
  78.      @Override  
  79.       public void init(FilterConfig arg0) throws ServletException {  
  80.      }  

package com.robin.erp.fwk.security;
 import java.io.IOException;
 
 import javax.servlet.Filter;
 import javax.servlet.FilterChain;
 import javax.servlet.FilterConfig;
 import javax.servlet.ServletException;
 import javax.servlet.ServletRequest;
 import javax.servlet.ServletResponse;
 
 import org.springframework.security.access.SecurityMetadataSource;
 import org.springframework.security.access.intercept.AbstractSecurityInterceptor;
 import org.springframework.security.access.intercept.InterceptorStatusToken;
 import org.springframework.security.web.FilterInvocation;
 import org.springframework.security.web.access.intercept.FilterInvocationSecurityMetadataSource;
 
 public class MyFilterSecurityInterceptor extends AbstractSecurityInterceptor
          implements Filter {
 
     private FilterInvocationSecurityMetadataSource securityMetadataSource;
 
     // ~ Methods
     // ========================================================================================================
 
      /**
      * Method that is actually called by the filter chain. Simply delegates to
      * the {@link #invoke(FilterInvocation)} method.
      * 
      * @param request
      *            the servlet request
      * @param response
      *            the servlet response
      * @param chain
      *            the filter chain
      * 
      * @throws IOException
      *             if the filter chain fails
      * @throws ServletException
      *             if the filter chain fails
      */
     public void doFilter(ServletRequest request, ServletResponse response,
              FilterChain chain) throws IOException, ServletException {
         FilterInvocation fi = new FilterInvocation(request, response, chain);
         invoke(fi);
     }
 
      public FilterInvocationSecurityMetadataSource getSecurityMetadataSource() {
         return this.securityMetadataSource;
     }
 
      public Class<? extends Object> getSecureObjectClass() {
         return FilterInvocation.class;
     }
 
     public void invoke(FilterInvocation fi) throws IOException,
              ServletException {
         InterceptorStatusToken token = super.beforeInvocation(fi);
          try {
             fi.getChain().doFilter(fi.getRequest(), fi.getResponse());
          } finally {
             super.afterInvocation(token, null);
         }
     }
 
      public SecurityMetadataSource obtainSecurityMetadataSource() {
         return this.securityMetadataSource;
     }
 
     public void setSecurityMetadataSource(
              FilterInvocationSecurityMetadataSource newSource) {
         this.securityMetadataSource = newSource;
     }
 
     @Override
      public void destroy() {
     }
 
     @Override
      public void init(FilterConfig arg0) throws ServletException {
     }



最核心的代码就是invoke方法中的InterceptorStatusToken token = super.beforeInvocation(fi);这一句,即在执行doFilter之前,进行权限的检查,而具体的实现已经交给 accessDecisionManager了,下文中会讲述。

来看看authentication-provider的实现:

Java代码  收藏代码

   1. package com.robin.erp.fwk.security;  
   2.  import java.util.ArrayList;  
   3.  import java.util.Collection;  
   4.    
   5.  import org.springframework.dao.DataAccessException;  
   6.  import org.springframework.security.core.GrantedAuthority;  
   7.  import org.springframework.security.core.authority.GrantedAuthorityImpl;  
   8.  import org.springframework.security.core.userdetails.User;  
   9.  import org.springframework.security.core.userdetails.UserDetails;  
  10.  import org.springframework.security.core.userdetails.UserDetailsService;  
  11.  import org.springframework.security.core.userdetails.UsernameNotFoundException;  
  12.    
  13.   public class MyUserDetailService implements UserDetailsService {  
  14.    
  15.      @Override  
  16.      public UserDetails loadUserByUsername(String username)  
  17.               throws UsernameNotFoundException, DataAccessException {  
  18.          Collection<GrantedAuthority> auths=new ArrayList<GrantedAuthority>();  
  19.          GrantedAuthorityImpl auth2=new GrantedAuthorityImpl("ROLE_ADMIN");  
  20.          auths.add(auth2);  
  21.           if(username.equals("robin1")){  
  22.              auths=new ArrayList<GrantedAuthority>();  
  23.              GrantedAuthorityImpl auth1=new GrantedAuthorityImpl("ROLE_ROBIN");  
  24.              auths.add(auth1);  
  25.          }  
  26.            
  27.  //        User(String username, String password, boolean enabled, boolean accountNonExpired,  
  28.  //                    boolean credentialsNonExpired, boolean accountNonLocked, Collection<GrantedAuthority> authorities) {  
  29.          User user = new User(username,  
  30.                  "robin", true, true, true, true, auths);  
  31.          return user;  
  32.      }  
  33.        
  34.  }  

package com.robin.erp.fwk.security;
 import java.util.ArrayList;
 import java.util.Collection;
 
 import org.springframework.dao.DataAccessException;
 import org.springframework.security.core.GrantedAuthority;
 import org.springframework.security.core.authority.GrantedAuthorityImpl;
 import org.springframework.security.core.userdetails.User;
 import org.springframework.security.core.userdetails.UserDetails;
 import org.springframework.security.core.userdetails.UserDetailsService;
 import org.springframework.security.core.userdetails.UsernameNotFoundException;
 
  public class MyUserDetailService implements UserDetailsService {
 
     @Override
     public UserDetails loadUserByUsername(String username)
              throws UsernameNotFoundException, DataAccessException {
         Collection<GrantedAuthority> auths=new ArrayList<GrantedAuthority>();
         GrantedAuthorityImpl auth2=new GrantedAuthorityImpl("ROLE_ADMIN");
         auths.add(auth2);
          if(username.equals("robin1")){
             auths=new ArrayList<GrantedAuthority>();
             GrantedAuthorityImpl auth1=new GrantedAuthorityImpl("ROLE_ROBIN");
             auths.add(auth1);
         }
         
 //        User(String username, String password, boolean enabled, boolean accountNonExpired,
 //                    boolean credentialsNonExpired, boolean accountNonLocked, Collection<GrantedAuthority> authorities) {
         User user = new User(username,
                 "robin", true, true, true, true, auths);
         return user;
     }
     
 }



在这个类中,你就可以从数据库中读入用户的密码,角色信息,是否锁定,账号是否过期等,我想这么简单的代码就不再多解释了。

对于资源的访问权限的定义,我们通过实现FilterInvocationSecurityMetadataSource这个接口来初始化数据。

Java代码  收藏代码

   1. package com.robin.erp.fwk.security;  
   2. import java.util.ArrayList;  
   3. import java.util.Collection;  
   4. import java.util.HashMap;  
   5. import java.util.Iterator;  
   6. import java.util.Map;  
   7.   
   8. import org.springframework.security.access.ConfigAttribute;  
   9. import org.springframework.security.access.SecurityConfig;  
  10. import org.springframework.security.web.FilterInvocation;  
  11. import org.springframework.security.web.access.intercept.FilterInvocationSecurityMetadataSource;  
  12. import org.springframework.security.web.util.AntUrlPathMatcher;  
  13. import org.springframework.security.web.util.UrlMatcher;  
  14.   
  15.  /** 
  16.  *  
  17.  * 此类在初始化时,应该取到所有资源及其对应角色的定义 
  18.  *  
  19.  * @author Robin 
  20.  *  
  21.  */  
  22. public class MyInvocationSecurityMetadataSource  
  23.          implements FilterInvocationSecurityMetadataSource {  
  24.     private UrlMatcher urlMatcher = new AntUrlPathMatcher();;  
  25.     private static Map<String, Collection<ConfigAttribute>> resourceMap = null;  
  26.   
  27.      public MyInvocationSecurityMetadataSource() {  
  28.         loadResourceDefine();  
  29.     }  
  30.   
  31.      private void loadResourceDefine() {  
  32.         resourceMap = new HashMap<String, Collection<ConfigAttribute>>();  
  33.         Collection<ConfigAttribute> atts = new ArrayList<ConfigAttribute>();  
  34.         ConfigAttribute ca = new SecurityConfig("ROLE_ADMIN");  
  35.         atts.add(ca);  
  36.         resourceMap.put("/index.jsp", atts);  
  37.         resourceMap.put("/i.jsp", atts);  
  38.     }  
  39.   
  40.     // According to a URL, Find out permission configuration of this URL.  
  41.     public Collection<ConfigAttribute> getAttributes(Object object)  
  42.              throws IllegalArgumentException {  
  43.         // guess object is a URL.  
  44.         String url = ((FilterInvocation)object).getRequestUrl();  
  45.         Iterator<String> ite = resourceMap.keySet().iterator();  
  46.          while (ite.hasNext()) {  
  47.             String resURL = ite.next();  
  48.              if (urlMatcher.pathMatchesUrl(url, resURL)) {  
  49.                 return resourceMap.get(resURL);  
  50.             }  
  51.         }  
  52.         return null;  
  53.     }  
  54.   
  55.      public boolean supports(Class<?> clazz) {  
  56.         return true;  
  57.     }  
  58.       
  59.      public Collection<ConfigAttribute> getAllConfigAttributes() {  
  60.         return null;  
  61.     }  
  62.   
  63. }  

 package com.robin.erp.fwk.security;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.Map;
 
 import org.springframework.security.access.ConfigAttribute;
 import org.springframework.security.access.SecurityConfig;
 import org.springframework.security.web.FilterInvocation;
 import org.springframework.security.web.access.intercept.FilterInvocationSecurityMetadataSource;
 import org.springframework.security.web.util.AntUrlPathMatcher;
 import org.springframework.security.web.util.UrlMatcher;
 
  /**
  * 
  * 此类在初始化时,应该取到所有资源及其对应角色的定义
  * 
  * @author Robin
  * 
  */
 public class MyInvocationSecurityMetadataSource
          implements FilterInvocationSecurityMetadataSource {
     private UrlMatcher urlMatcher = new AntUrlPathMatcher();;
     private static Map<String, Collection<ConfigAttribute>> resourceMap = null;
 
      public MyInvocationSecurityMetadataSource() {
         loadResourceDefine();
     }
 
      private void loadResourceDefine() {
         resourceMap = new HashMap<String, Collection<ConfigAttribute>>();
         Collection<ConfigAttribute> atts = new ArrayList<ConfigAttribute>();
         ConfigAttribute ca = new SecurityConfig("ROLE_ADMIN");
         atts.add(ca);
         resourceMap.put("/index.jsp", atts);
         resourceMap.put("/i.jsp", atts);
     }
 
     // According to a URL, Find out permission configuration of this URL.
     public Collection<ConfigAttribute> getAttributes(Object object)
              throws IllegalArgumentException {
         // guess object is a URL.
         String url = ((FilterInvocation)object).getRequestUrl();
         Iterator<String> ite = resourceMap.keySet().iterator();
          while (ite.hasNext()) {
             String resURL = ite.next();
              if (urlMatcher.pathMatchesUrl(url, resURL)) {
                 return resourceMap.get(resURL);
             }
         }
         return null;
     }
 
      public boolean supports(Class<?> clazz) {
         return true;
     }
     
      public Collection<ConfigAttribute> getAllConfigAttributes() {
         return null;
     }
 
 }



看看loadResourceDefine方法,我在这里,假定index.jsp和i.jsp这两个资源,需要ROLE_ADMIN角色的用户才能访问。
这个类中,还有一个最核心的地方,就是提供某个资源对应的权限定义,即getAttributes方法返回的结果。注意,我例子中使用的是 AntUrlPathMatcher这个path matcher来检查URL是否与资源定义匹配,事实上你还要用正则的方式来匹配,或者自己实现一个matcher。

剩下的就是最终的决策了,make a decision,其实也很容易,呵呵。

Java代码  收藏代码

   1. package com.robin.erp.fwk.security;  
   2. import java.util.Collection;  
   3. import java.util.Iterator;  
   4.   
   5. import org.springframework.security.access.AccessDecisionManager;  
   6. import org.springframework.security.access.AccessDeniedException;  
   7. import org.springframework.security.access.ConfigAttribute;  
   8. import org.springframework.security.access.SecurityConfig;  
   9. import org.springframework.security.authentication.InsufficientAuthenticationException;  
  10. import org.springframework.security.core.Authentication;  
  11. import org.springframework.security.core.GrantedAuthority;  
  12.   
  13.   
  14.  public class MyAccessDecisionManager implements AccessDecisionManager {  
  15.   
  16.     //In this method, need to compare authentication with configAttributes.  
  17.     // 1, A object is a URL, a filter was find permission configuration by this URL, and pass to here.  
  18.     // 2, Check authentication has attribute in permission configuration (configAttributes)  
  19.     // 3, If not match corresponding authentication, throw a AccessDeniedException.  
  20.     public void decide(Authentication authentication, Object object,  
  21.             Collection<ConfigAttribute> configAttributes)  
  22.              throws AccessDeniedException, InsufficientAuthenticationException {  
  23.          if(configAttributes == null){  
  24.             return ;  
  25.         }  
  26.         System.out.println(object.toString());  //object is a URL.  
  27.         Iterator<ConfigAttribute> ite=configAttributes.iterator();  
  28.          while(ite.hasNext()){  
  29.             ConfigAttribute ca=ite.next();  
  30.             String needRole=((SecurityConfig)ca).getAttribute();  
  31.              for(GrantedAuthority ga:authentication.getAuthorities()){  
  32.                  if(needRole.equals(ga.getAuthority())){  //ga is user's role.  
  33.                     return;  
  34.                 }  
  35.             }  
  36.         }  
  37.         throw new AccessDeniedException("no right");  
  38.     }  
  39.   
  40.     @Override  
  41.      public boolean supports(ConfigAttribute attribute) {  
  42.         // TODO Auto-generated method stub  
  43.         return true;  
  44.     }  
  45.   
  46.     @Override  
  47.      public boolean supports(Class<?> clazz) {  
  48.         return true;  
  49.     }  
  50. }  

 package com.robin.erp.fwk.security;
 import java.util.Collection;
 import java.util.Iterator;
 
 import org.springframework.security.access.AccessDecisionManager;
 import org.springframework.security.access.AccessDeniedException;
 import org.springframework.security.access.ConfigAttribute;
 import org.springframework.security.access.SecurityConfig;
 import org.springframework.security.authentication.InsufficientAuthenticationException;
 import org.springframework.security.core.Authentication;
 import org.springframework.security.core.GrantedAuthority;
 
 
  public class MyAccessDecisionManager implements AccessDecisionManager {
 
     //In this method, need to compare authentication with configAttributes.
     // 1, A object is a URL, a filter was find permission configuration by this URL, and pass to here.
     // 2, Check authentication has attribute in permission configuration (configAttributes)
     // 3, If not match corresponding authentication, throw a AccessDeniedException.
     public void decide(Authentication authentication, Object object,
             Collection<ConfigAttribute> configAttributes)
              throws AccessDeniedException, InsufficientAuthenticationException {
          if(configAttributes == null){
             return ;
         }
         System.out.println(object.toString());  //object is a URL.
         Iterator<ConfigAttribute> ite=configAttributes.iterator();
          while(ite.hasNext()){
             ConfigAttribute ca=ite.next();
             String needRole=((SecurityConfig)ca).getAttribute();
              for(GrantedAuthority ga:authentication.getAuthorities()){
                  if(needRole.equals(ga.getAuthority())){  //ga is user's role.
                     return;
                 }
             }
         }
         throw new AccessDeniedException("no right");
     }
 
     @Override
      public boolean supports(ConfigAttribute attribute) {
         // TODO Auto-generated method stub
         return true;
     }
 
     @Override
      public boolean supports(Class<?> clazz) {
         return true;
     }
 }




在这个类中,最重要的是decide方法,如果不存在对该资源的定义,直接放行;否则,如果找到正确的角色,即认为拥有权限,并放行,否则 throw new AccessDeniedException("no right");这样,就会进入上面提到的403.jsp页面。

参考资料:
1,Spring官方网站:http://www.springframework.org
2,文章所用的代码,MyEclipse工程,去掉了lib,请自行下载Spring Security 3.x的包,并copy至对应目录。工程源代码
3,根据网络上的资料,制作的CHM版的 Spring Security 3.x 参考手册中文版
4,2009年3月,我在“IBM WebSphere技术专家沙龙(华南区广州站)”演讲时的PPT:《Spring Security--Protect your web application》,当时是Spring Security 2.x,很多原理是一样,可作参考。

教程中为了尽可能不跟其它框架关联上,所以去掉了访问数据库的部分,比如用户信息和资源配置信息的读取,直接写死在代码中了,大家可以根据自己的实际情况补充完整。

如有任何疑问,欢迎大家以评论的方式提问,也欢迎大家讨论!

------------------------------------

学习spring security 3一篇很好的文章,忍不住分享之。网上好多转载,已经分不清原作者的文章了,若有作者有反感转载请告之,立马处理掉。 
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