Spring Security教程(五)

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');
user表中包含用户登陆信息,role角色表中包含授权信息,resc资源表中包含需要保护的资源。

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:


这样的格式正是security所需要的数据。

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<RequestMatcher, Collection<ConfigAttribute>>这样的类型,其中RequestMatcher接口就是我们数据库中的res_string,其实现类为AntPathRequestMatcher,构建一个这样的对象只要在new的时候传入res_string就可以了,Collection<ConfigAttribute>这里对象构建起来就也是类似的,构建一个ConfigAttribute对象只需要在其实现类SecurityConfig创建的时候传入角色的名字就可以。代码如下:

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 List<Resource> findResources() {
        ResourceMapping resourceMapping = new ResourceMapping(getDataSource(),
                resourceQuery);
        return resourceMapping.execute();
    }
    
    //拼接RequestMap
    public LinkedHashMap<RequestMatcher, Collection<ConfigAttribute>> buildRequestMap() {
        LinkedHashMap<RequestMatcher, Collection<ConfigAttribute>> requestMap = new LinkedHashMap<>();
        
        List<Resource> resourceList = this.findResources();
        for (Resource resource : resourceList) {
			RequestMatcher requestMatcher = this.getRequestMatcher(resource.getUrl());
			List<ConfigAttribute> list = new ArrayList<ConfigAttribute>();
			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<RequestMatcher, Collection<ConfigAttribute>>共security使用。

四 替换原有功能的切入点

在将这部之前,先得了解大概下security的运行过程,security实现控制的功能其实就是通过一系列的拦截器来实现的,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。

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 List<ConfigAttribute> NULL_CONFIG_ATTRIBUTE = null;
	// 资源权限集合
	private Map<RequestMatcher, Collection<ConfigAttribute>> 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<ConfigAttribute> getAttributes(Object object)
			throws IllegalArgumentException {
		final HttpServletRequest request = ((FilterInvocation) object)
				.getRequest();

		Collection<ConfigAttribute> attrs = NULL_CONFIG_ATTRIBUTE;
		for (Map.Entry<RequestMatcher, Collection<ConfigAttribute>> 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<ConfigAttribute> getAllConfigAttributes() {
		Set<ConfigAttribute> allAttributes = new HashSet<ConfigAttribute>();
		for (Map.Entry<RequestMatcher, Collection<ConfigAttribute>> 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<RequestMatcher, Collection<ConfigAttribute>> 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" />
		<!-- 通过配置custom-filter来增加过滤器,before="FILTER_SECURITY_INTERCEPTOR"表示在SpringSecurity默认的过滤器之前执行。 -->
		<custom-filter ref="filterSecurityInterceptor" before="FILTER_SECURITY_INTERCEPTOR" />
	</http>
	
	<!-- 数据源 -->
	<beans:bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
		destroy-method="close">
		<!-- 此为c3p0在spring中直接配置datasource c3p0是一个开源的JDBC连接池 -->
		<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>

	
	<!-- 认证过滤器 -->
	<beans:bean id="filterSecurityInterceptor"
		class="org.springframework.security.web.access.intercept.FilterSecurityInterceptor">
		<!-- 用户拥有的权限 -->
		<beans:property name="accessDecisionManager" ref="accessDecisionManager" />
		<!-- 用户是否拥有所请求资源的权限 -->
		<beans:property name="authenticationManager" ref="authenticationManager" />
		<!-- 资源与权限对应关系 -->
		<beans:property name="securityMetadataSource" ref="securityMetadataSource" />
	</beans:bean>
	
	<!-- 授权管理器 -->
	<beans:bean class="com.zmc.demo.MyAccessDecisionManager" id="accessDecisionManager">
	</beans:bean>
	<!--认证管理-->
	<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>
	<!--自定义的切入点-->
	<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,
			Collection<ConfigAttribute> configAttributes)
			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<ConfigAttribute> 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;
	}

	

}

五 结果

用户对应的角色,和角色能访问的资源


admin能访问的页面有adminPage.jsp、index.jsp;user能访问的有index.jsp;test能访问的有test.jsp。

先测试admin用户:

user用户测试:


test用户测试:

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