在之前的几篇security教程中,资源和所对应的权限都是在xml中进行配置的,也就在http标签中配置intercept-url,试想要是配置的对象不多,那还好,但是平常实际开发中都往往是非常多的资源和权限对应,而且写在配置文件里面写改起来还得该源码配置文件,这显然是不好的。因此接下来,将用数据库管理资源和权限的对应关系。数据库还是接着之前的,用mysql数据库,因此也不用另外引入额外的jar包。
一、数据库表的设计
数据库要提供给security的数据无非就是,资源(说的通俗点就是范围资源地址)和对应的权限,这里就有两张表,但是因为他们俩是多对多的关系,因此还要设计一张让这两张表关联起来的表,除此之外,还有一张用户表,有因为用户和角色也是多对多的关系,还要额外加一张用户和角色关联的表。这样总共下来就是五张表。下面就是对应的模型图:
建表和添加数据的sql语句:
DROP TABLE IF EXISTS `resc`; CREATE TABLE `resc` ( `id` bigint(20) NOT NULL DEFAULT '0', `name` varchar(50) DEFAULT NULL, `res_type` varchar(50) DEFAULT NULL, `res_string` varchar(200) DEFAULT NULL, `descn` varchar(200) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; -- ---------------------------- -- Records of resc -- ---------------------------- INSERT INTO `resc` VALUES ('1', '', 'URL', '/adminPage.jsp', '管理员页面'); INSERT INTO `resc` VALUES ('2', '', 'URL', '/index.jsp', ''); INSERT INTO `resc` VALUES ('3', null, 'URL', '/test.jsp', '测试页面'); -- ---------------------------- -- Table structure for resc_role -- ---------------------------- DROP TABLE IF EXISTS `resc_role`; CREATE TABLE `resc_role` ( `resc_id` bigint(20) NOT NULL DEFAULT '0', `role_id` bigint(20) NOT NULL DEFAULT '0', PRIMARY KEY (`resc_id`,`role_id`), KEY `fk_resc_role_role` (`role_id`), CONSTRAINT `fk_resc_role_role` FOREIGN KEY (`role_id`) REFERENCES `role` (`id`), CONSTRAINT `fk_resc_role_resc` FOREIGN KEY (`resc_id`) REFERENCES `resc` (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; -- ---------------------------- -- Records of resc_role -- ---------------------------- INSERT INTO `resc_role` VALUES ('1', '1'); INSERT INTO `resc_role` VALUES ('2', '1'); INSERT INTO `resc_role` VALUES ('2', '2'); INSERT INTO `resc_role` VALUES ('3', '3'); -- ---------------------------- -- Table structure for role -- ---------------------------- DROP TABLE IF EXISTS `role`; CREATE TABLE `role` ( `id` bigint(20) NOT NULL DEFAULT '0', `name` varchar(50) DEFAULT NULL, `descn` varchar(200) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; -- ---------------------------- -- Records of role -- ---------------------------- INSERT INTO `role` VALUES ('1', 'ROLE_ADMIN', '管理员角色'); INSERT INTO `role` VALUES ('2', 'ROLE_USER', '用户角色'); INSERT INTO `role` VALUES ('3', 'ROLE_TEST', '测试角色'); -- ---------------------------- -- Table structure for t_c3p0 -- ---------------------------- DROP TABLE IF EXISTS `t_c3p0`; CREATE TABLE `t_c3p0` ( `a` char(1) DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=utf8; -- ---------------------------- -- Records of t_c3p0 -- ---------------------------- -- ---------------------------- -- Table structure for user -- ---------------------------- DROP TABLE IF EXISTS `user`; CREATE TABLE `user` ( `id` bigint(20) NOT NULL DEFAULT '0', `username` varchar(50) DEFAULT NULL, `password` varchar(50) DEFAULT NULL, `status` int(11) DEFAULT NULL, `descn` varchar(200) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; -- ---------------------------- -- Records of user -- ---------------------------- INSERT INTO `user` VALUES ('1', 'admin', 'admin', '1', '管理员'); INSERT INTO `user` VALUES ('2', 'user', 'user', '1', '用户'); INSERT INTO `user` VALUES ('3', 'test', 'test', '1', '测试'); -- ---------------------------- -- Table structure for user_role -- ---------------------------- DROP TABLE IF EXISTS `user_role`; CREATE TABLE `user_role` ( `user_id` bigint(20) NOT NULL DEFAULT '0', `role_id` bigint(20) NOT NULL DEFAULT '0', PRIMARY KEY (`user_id`,`role_id`), KEY `fk_user_role_role` (`role_id`), CONSTRAINT `fk_user_role_role` FOREIGN KEY (`role_id`) REFERENCES `role` (`id`), CONSTRAINT `fk_user_role_user` FOREIGN KEY (`user_id`) REFERENCES `user` (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; -- ---------------------------- -- Records of user_role -- ---------------------------- INSERT INTO `user_role` VALUES ('1', '1'); INSERT INTO `user_role` VALUES ('1', '2'); INSERT INTO `user_role` VALUES ('2', '2'); INSERT INTO `user_role` VALUES ('3', '3');
二、实现从数据库中读取资源信息
Spring Security需要的数据无非就是pattern和access类似键值对的数据,就像配置文件中写的那样:
<intercept-url pattern="/login.jsp" access="IS_AUTHENTICATED_ANONYMOUSLY" />1 <intercept-url pattern="/admin.jsp" access="ROLE_ADMIN" /> <intercept-url pattern="/**" access="ROLE_USER" />
其实当项目启动时,Spring Security所做的就是在系统初始化时,将以上XML中的信息转换为特定的数据格式,而框架中其他组件可以利用这些特定格式的数据,用于控制之后的验证操作。现在我们将这些信息存储在数据库中,因此就要想办法从数据库中查询这些数据,所以根据security数据的需要,只需要如下sql语句就可以:
select re.res_string,r.name from role r,resc re,resc_role rr where r.id=rr.role_id and re.id=rr.resc_id
在数据中执行这条语句做测试,得到如下结果:
三、构建一个数据库的操作的类
虽然上述的数据符合security的需要,但是security将这种数据类型进行了封装,把它封装成Map
package com.zmc.demo; import java.sql.ResultSet; import java.sql.SQLException; import java.util.ArrayList; import java.util.Collection; import java.util.LinkedHashMap; import java.util.List; import javax.sql.DataSource; import org.springframework.jdbc.core.support.JdbcDaoSupport; import org.springframework.jdbc.object.MappingSqlQuery; import org.springframework.security.access.ConfigAttribute; import org.springframework.security.access.SecurityConfig; import org.springframework.security.web.access.intercept.DefaultFilterInvocationSecurityMetadataSource; import org.springframework.security.web.util.AntPathRequestMatcher; import org.springframework.security.web.util.RequestMatcher; /** * @classname JdbcRequestMapBulider * @author ZMC * @time 2017-1-10 * 查询资源和角色,并构建RequestMap */ public class JdbcRequestMapBulider extends JdbcDaoSupport{ //查询资源和权限关系的sql语句 private String resourceQuery = ""; public String getResourceQuery() { return resourceQuery; } //查询资源 public ListfindResources() { ResourceMapping resourceMapping = new ResourceMapping(getDataSource(), resourceQuery); return resourceMapping.execute(); } //拼接RequestMap public LinkedHashMap > buildRequestMap() { LinkedHashMap > requestMap = new LinkedHashMap<>(); List resourceList = this.findResources(); for (Resource resource : resourceList) { RequestMatcher requestMatcher = this.getRequestMatcher(resource.getUrl()); List list = new ArrayList (); list.add(new SecurityConfig(resource.getRole())); requestMap.put(requestMatcher, list); } return requestMap; } //通过一个字符串地址构建一个AntPathRequestMatcher对象 protected RequestMatcher getRequestMatcher(String url) { return new AntPathRequestMatcher(url); } public void setResourceQuery(String resourceQuery) { this.resourceQuery = resourceQuery; } /** * @classname Resource * @author ZMC * @time 2017-1-10 * 资源内部类 */ private class Resource { private String url;//资源访问的地址 private String role;//所需要的权限 public Resource(String url, String role) { this.url = url; this.role = role; } public String getUrl() { return url; } public String getRole() { return role; } } private class ResourceMapping extends MappingSqlQuery { protected ResourceMapping(DataSource dataSource, String resourceQuery) { super(dataSource, resourceQuery); compile(); } //对结果集进行封装处理 protected Object mapRow(ResultSet rs, int rownum) throws SQLException { String url = rs.getString(1); String role = rs.getString(2); Resource resource = new Resource(url, role); return resource; } } }
说明:
- resourceQuery是查询数据的sql语句,该属性在配置bean的时候传入即可。
- 内部创建了一个resource来封装数据。
- getRequestMatcher方法就是用来创建RequestMatcher对象的
- buildRequestMap方法用来最后拼接成LinkedHashMap
>共security使用。
四、替换原有功能的切入点
在讲这部分之前,先得了解大概下security的运行过程,我们知道Spring Security核心就是一系列的过滤器链。当一个请求来的时候,首先要通过过滤器链的校验,校验通过之后才会访问用户各种信息。
当用户登陆的时候,会被AuthenticationProcessingFilter拦截,调用AuthenticationManager的实现类。
同时AuthenticationManager会调用ProviderManager来获取用户验证信息,其中不同的Provider调用的服务不同,因为这些信息可以是在数据库上,可以是在LDAP服务器上,可以是xml配置文件上等,这个例子中就是为数据库。
如果验证通过后会将用户的权限信息放到spring的全局缓存SecurityContextHolder中,以备后面访问资源时使用。
当访问资源,访问url时,会通过AbstractSecurityInterceptor拦截器拦截,其中会调用FilterInvocationSecurityMetadataSource的方法来获取被拦截url所需的全部权限,其中FilterInvocationSecurityMetadataSource的常用的实现类为DefaultFilterInvocationSecurityMetadataSource,这个类中有个很关键的东西就是requestMap,也就是我们上面所得到的数据,在调用授权管理器AccessDecisionManager,这个授权管理器会通过spring的全局缓存SecurityContextHolder获取用户的权限信息,还会获取被拦截的url和被拦截url所需的全部权限,然后根据所配的策略,如果权限足够,则返回,权限不够则报错并调用权限不足页面。
根据源码debug跟踪得出,其实资源权限关系就放在DefaultFilterInvocationSecurityMetadataSource的requestMap,中的,这个requestMap就是我们JdbcRequestMapBulider.buildRequestMap()方法所需要的数据类型,因此,顺气自然就想到了我们自定义一个类继承FilterInvocationSecurityMetadataSource接口,将数据查出的数据放到requestMap中去。制定类MyFilterInvocationSecurityMetadataSource继承FilterInvocationSecurityMetadataSource和InitializingBean接口。
更多流程参阅:Spring Security教程(八):用户认证流程源码详解
package com.zmc.demo; import java.util.Collection; import java.util.HashSet; import java.util.List; import java.util.Map; import java.util.Set; import javax.servlet.http.HttpServletRequest; import org.springframework.beans.factory.InitializingBean; import org.springframework.security.access.ConfigAttribute; import org.springframework.security.web.FilterInvocation; import org.springframework.security.web.access.intercept.FilterInvocationSecurityMetadataSource; import org.springframework.security.web.util.RequestMatcher; /** * @classname MyFilterInvocationSecurityMetadataSource * @author ZMC * @time 2017-1-10 */ public class MyFilterInvocationSecurityMetadataSource implements FilterInvocationSecurityMetadataSource, InitializingBean { private final static ListNULL_CONFIG_ATTRIBUTE = null; // 资源权限集合 private Map > requestMap; //查找数据库权限和资源关系 private JdbcRequestMapBulider builder; /* * (non-Javadoc) * @see * org.springframework.security.access.SecurityMetadataSource#getAttributes * (java.lang.Object) * 更具访问资源的地址查找所需要的权限 */ @Override public Collection getAttributes(Object object) throws IllegalArgumentException { final HttpServletRequest request = ((FilterInvocation) object) .getRequest(); Collection attrs = NULL_CONFIG_ATTRIBUTE; for (Map.Entry > entry : requestMap .entrySet()) { if (entry.getKey().matches(request)) { attrs = entry.getValue(); break; } } return attrs; } /* * (non-Javadoc) * * @see org.springframework.security.access.SecurityMetadataSource# * getAllConfigAttributes() * 获取所有的权限 */ @Override public Collection getAllConfigAttributes() { Set allAttributes = new HashSet (); for (Map.Entry > entry : requestMap .entrySet()) { allAttributes.addAll(entry.getValue()); } System.out.println("总共有这些权限:"+allAttributes.toString()); return allAttributes; } /* * (non-Javadoc) * * @see * org.springframework.security.access.SecurityMetadataSource#supports(java * .lang.Class) */ @Override public boolean supports(Class> clazz) { return FilterInvocation.class.isAssignableFrom(clazz); } //绑定requestMap protected Map > bindRequestMap() { return builder.buildRequestMap(); } /* * (non-Javadoc) * * @see * org.springframework.beans.factory.InitializingBean#afterPropertiesSet() */ @Override public void afterPropertiesSet() throws Exception { this.requestMap = this.bindRequestMap(); } public void refreshResuorceMap() { this.requestMap = this.bindRequestMap(); } //get方法 public JdbcRequestMapBulider getBuilder() { return builder; } //set方法 public void setBuilder(JdbcRequestMapBulider builder) { this.builder = builder; } }
说明:
- requestMap这个属性就是用来存放资源权限的集合
- builder为JdbcRequestMapBulider类型,用来查找数据库权限和资源关系
- 其他的代码中都有详细的注释
四、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-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/security http://www.springframework.org/schema/security/spring-security.xsd"> <http pattern="/login.jsp" security="none">http> <http auto-config="false"> <form-login login-page="/login.jsp" default-target-url="/index.jsp" authentication-failure-url="/login.jsp?error=true" /> <logout invalidate-session="true" logout-success-url="/login.jsp" logout-url="/j_spring_security_logout" /> <custom-filter ref="filterSecurityInterceptor" before="FILTER_SECURITY_INTERCEPTOR" /> http> <beans:bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close"> <beans:property name="driverClass" value="com.mysql.jdbc.Driver" /> <beans:property name="jdbcUrl" value="jdbc:mysql://localhost:3306/springsecuritydemo?useUnicode=true&characterEncoding=UTF-8" /> <beans:property name="user" value="root" /> <beans:property name="password" value="" /> <beans:property name="maxPoolSize" value="50">beans:property> <beans:property name="minPoolSize" value="10">beans:property> <beans:property name="initialPoolSize" value="10">beans:property> <beans:property name="maxIdleTime" value="25000">beans:property> <beans:property name="acquireIncrement" value="1">beans:property> <beans:property name="acquireRetryAttempts" value="30">beans:property> <beans:property name="acquireRetryDelay" value="1000">beans:property> <beans:property name="testConnectionOnCheckin" value="true">beans:property> <beans:property name="idleConnectionTestPeriod" value="18000">beans:property> <beans:property name="checkoutTimeout" value="5000">beans:property> <beans:property name="automaticTestTable" value="t_c3p0">beans:property> beans:bean> <beans:bean id="builder" class="com.zmc.demo.JdbcRequestMapBulider"> <beans:property name="dataSource" ref="dataSource" /> <beans:property name="resourceQuery" value="select re.res_string,r.name from role r,resc re,resc_role rr where r.id=rr.role_id and re.id=rr.resc_id" /> beans:bean> <beans:bean id="filterSecurityInterceptor" class="org.springframework.security.web.access.intercept.FilterSecurityInterceptor"> <beans:property name="accessDecisionManager" ref="accessDecisionManager" /> <beans:property name="authenticationManager" ref="authenticationManager" /> <beans:property name="securityMetadataSource" ref="securityMetadataSource" /> beans:bean> <beans:bean class="com.zmc.demo.MyAccessDecisionManager" id="accessDecisionManager"> beans:bean> <authentication-manager alias="authenticationManager"> <authentication-provider> <jdbc-user-service data-source-ref="dataSource" id="usersService" users-by-username-query="select username,password,status as enabled from user where username = ?" authorities-by-username-query="select user.username,role.name from user,role,user_role where user.id=user_role.user_id and user_role.role_id=role.id and user.username=?" /> authentication-provider> authentication-manager> <beans:bean id="securityMetadataSource" class="com.zmc.demo.MyFilterInvocationSecurityMetadataSource"> <beans:property name="builder" ref="builder">beans:property> beans:bean> beans:beans>
1.http中的custom-filter是特别要注意的,就是通过这个标签来增加过滤器的,其中before="FILTER_SECURITY_INTERCEPTOR"表示在SpringSecurity默认的过滤器之前执行。
2.在配置builder时候,resourceQuery就是要查询的sql语句,dataSource为数据源。其他的如authenticationManager在之前的博客配置中就有详细讲解。
3.在配置认证过滤器的时候,accessDecisionManager,authenticationManager,securityMetadataSource这三个属性是必填项,若缺失会报错。其中authenticationManager就是authentication-manager标签,securityMetadataSource
是自定义的MyFilterInvocationSecurityMetadataSource,authenticationManager这里还没有定义,因此再创建一个类叫MyAccessDecisionManager,代码如下:
package com.zmc.demo; 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.authentication.InsufficientAuthenticationException; import org.springframework.security.core.Authentication; import org.springframework.security.core.GrantedAuthority; /** * @classname MyAccessDecisionManager * @author ZMC * @time 2017-1-10 * */ public class MyAccessDecisionManager implements AccessDecisionManager { /* (non-Javadoc) * @see org.springframework.security.access.AccessDecisionManager#decide(org.springframework.security.core.Authentication, java.lang.Object, java.util.Collection) * 该方法决定该权限是否有权限访问该资源,其实object就是一个资源的地址,authentication是当前用户的 * 对应权限,如果没登陆就为游客,登陆了就是该用户对应的权限 */ @Override public void decide(Authentication authentication, Object object, CollectionconfigAttributes) throws AccessDeniedException, InsufficientAuthenticationException { if(configAttributes == null) { return; } //所请求的资源拥有的权限(一个资源对多个权限) Iterator iterator = configAttributes.iterator(); while(iterator.hasNext()) { ConfigAttribute configAttribute = iterator.next(); //访问所请求资源所需要的权限 String needPermission = configAttribute.getAttribute(); System.out.println("访问"+object.toString()+"需要的权限是:" + needPermission); //用户所拥有的权限authentication Collection extends GrantedAuthority> authorities = authentication.getAuthorities(); for(GrantedAuthority ga : authorities) { if(needPermission.equals(ga.getAuthority())) { return; } } } //没有权限 throw new AccessDeniedException(" 没有权限访问! "); } @Override public boolean supports(ConfigAttribute attribute) { // TODO Auto-generated method stub return true; } @Override public boolean supports(Class> clazz) { // TODO Auto-generated method stub return true; } }
user用户测试:
test用户测试: