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SpringSecurity3.X--一个简单实现

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作者 正文
   发表时间:2011-08-22  

作者对springsecurity研究不深,算是个初学者吧,最近很不完整的看了一下翻译的很是生硬的《Spring3Security-3.0.1中文官方文档.pdf》,为了便于学习和记忆,所以将所学知识在此记录下来。

这里给出一个简单的安全验证的实现例子,先说一下需求:

1.通过登录页面进行登录

2.用户登录前访问被保护的地址时自动跳转到登录页面

3.用户信息存储在数据表中

4.用户权限信息存在在数据表中

5.用户登录成功后访问没有权限访问的地址时跳转到登录页面

 

ok,以上就是一个基本的需求了,大部分的系统都是基于该需求实现登录模块的。

 

给出实现之前,先简单说明一下springsecurity的原理,

1.AccessDecisionManager

和我们一般实现登录验证采用filter的方式一样,springsecurity也是一个过滤器,当请求被springsecurity拦截后,会先对用户请求的资源进行安全认证,如果用户有权访问该资源,则放行,否则将阻断用户请求或提供用户登录,

在springsecurity中,负责对用户的请求资源进行安全认证的是AccessDecisionManager,它就是一组投票器的集合,默认的策略是使用一个AffirmativeBased,既只要有一个投票器通过验证就允许用户访问,所以如果希望实现自己的权限验证策略,实现自己的投票器是一个很好的选择。

 

2.UserDetailsService

如果用户没有登录就访问某一个受保护的资源,则springsecurity会提示用户登录,用户登录后,由UserDetailsService来验证用户是否合法,既验证用户名和密码是否正确,同时验证用户是否具备相应的资源权限,即对应的access的value。

如果用户验证通过,则由AccessDecisionManager来决定是否用户可以访问该资源。

 

下面给出具体实现:

web.xml

基本上都是这样配置,就不废话了。

        <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>
 

applicationContext-security.xml

 

<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/security"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
	xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:util="http://www.springframework.org/schema/util" xmlns:mvc="http://www.springframework.org/schema/mvc"
	xmlns:tool="http://www.springframework.org/schema/tool" xmlns:beans="http://www.springframework.org/schema/beans"
	xsi:schemaLocation="
			http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
			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-3.0.xsd
			http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.0.xsd
			http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
			http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd
			http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
			http://www.springframework.org/schema/tool http://www.springframework.org/schema/tool/spring-tool-3.0.xsd
			http://www.springframework.org/schema/security http://www.springframework.org/schema/security/spring-security-3.1.xsd"
	default-lazy-init="true">

        <!-- 不需要进行认证的资源,3.0之后才改为这样配置 -->
	<http security="none" pattern="/index.do" />

        <!-- 因为要使用自己的权限验证规则,所以这里要配置access-decision-manager-ref
         实际上,我只是在accessDecisionManager中增加了一个投票器,其它的属性都比较简单,不多说了
         -->
	<http auto-config='true' access-decision-manager-ref="accessDecisionManager"
		access-denied-page="/index.do">
		<intercept-url pattern="/demo.do*" access="IS_AUTHENTICATED_REMEMBERED" />
		<intercept-url pattern="/**/*.do*" access="HODLE" />
		<logout logout-url="/logout.do" invalidate-session="true"
			logout-success-url="/logout.jsp" />
		<form-login login-page="/index.do" default-target-url="/frame.do"
			always-use-default-target="true" authentication-failure-url="/index.do?login_error=1" />
		<session-management>
			<concurrency-control max-sessions="1" />
		</session-management>
	</http>



	<!-- Automatically receives AuthenticationEvent messages -->
	<beans:bean id="loggerListener"
		class="org.springframework.security.authentication.event.LoggerListener" />

       <!-- 认证管理器,使用自定义的UserDetailsService,并对密码采用md5加密
 -->
	<authentication-manager>
		<authentication-provider user-service-ref="userService">
			<password-encoder hash="md5" />
		</authentication-provider>
	</authentication-manager>

	<beans:bean id="userService" class="com.piaoyi.common.security.UserService" />

       <!-- 访问决策管理器,这里使用
AffirmativeBased,并加入一个自定义的投票器
DynamicRoleVoter -->
	<beans:bean id="accessDecisionManager"
		class="org.springframework.security.access.vote.AffirmativeBased">
		<beans:property name="decisionVoters">
			<beans:list>
				<beans:bean class="org.springframework.security.access.vote.RoleVoter" />
				<beans:bean
					class="org.springframework.security.access.vote.AuthenticatedVoter" />
				<beans:bean class="com.piaoyi.common.security.DynamicRoleVoter" />
			</beans:list>
		</beans:property>
	</beans:bean>
</beans:beans>
 

UserService.java

 

public class UserService implements UserDetailsService{

	@Autowired
	private ISystemUserService userService;
	@Override
	public UserDetails loadUserByUsername(String username)
			throws UsernameNotFoundException {
		// TODO Auto-generated method stub
		SystemUser user = userService.findById(username);		
		if (user == null)
			throw new UsernameNotFoundException("The user name " + username
					+ " can not be found!");

		List<GrantedAuthority> resultAuths = new ArrayList<SystemAuthority>();
               //增加access中配置的权限,实际上这里就是让所有登陆用户都具备该权限,
               //而真正的资源权限验证留给AccessDecisionManager来决定
                resultAuths.add(new GrantedAuthorityImpl("HODLE"));
		
		//验证用户名和密码是否正确,以及是否权限正确
		return new User(username, user.getPassword().toLowerCase(), user.isStatus(), true,
				true, true, resultAuths);
		
		
	}
}
 

DynamicRoleVoter.java

public class DynamicRoleVoter  implements
		AccessDecisionVoter {

	@Autowired
	private ISystemUserService userService;

	private PathMatcher pathMatcher = new AntPathMatcher();
	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.springframework.security.vote.AccessDecisionVoter#supports(java.lang
	 * .Class)
	 */
	@SuppressWarnings("unchecked")
	public boolean supports(Class clazz) {
		return true;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @seeorg.springframework.security.vote.AccessDecisionVoter#supports(org.
	 * springframework.security.ConfigAttribute)
	 */
	public boolean supports(ConfigAttribute attribute) {
		return true;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @seeorg.springframework.security.vote.AccessDecisionVoter#vote(org.
	 * springframework.security.Authentication, java.lang.Object,
	 * org.springframework.security.ConfigAttributeDefinition)
	 */
	public int vote(Authentication authentication, Object object,
			java.util.Collection arg2) {
		int result = ACCESS_ABSTAIN;
		if (!(object instanceof FilterInvocation))
			return result;
		FilterInvocation invo = (FilterInvocation) object;
		String url = invo.getRequestUrl();//当前请求的URL
		Set<GrantedAuthority> authorities = null;
		String userId = authentication.getName();
		//获得当前用户的可访问资源,自定义的查询方法,之后和当前请求资源进行匹配,成功则放行,否则拦截	
		authorities = loadUserAuthorities(userService.findById(userId));
		Map<String, Set<String>> urlAuths = authService.getUrlAuthorities();
		Set<String> keySet = urlAuths.keySet();
		for (String key : keySet) {
			boolean matched = pathMatcher.match(key, url);
			if (!matched)
				continue;
			Set<String> mappedAuths = urlAuths.get(key);
			if (contain(authorities, mappedAuths)) {
				result = ACCESS_GRANTED;
				break;
			}
		}
		return result;
	}
	
	
	protected boolean contain(Set<GrantedAuthority> authorities,
			Set<String> mappedAuths) {
		if (CollectionUtils.isEmpty(mappedAuths)
				|| CollectionUtils.isEmpty(authorities))
			return false;
		for (GrantedAuthority item : authorities) {
			if (mappedAuths.contains(item.getAuthority()))
				return true;
		}
		return false;
	}
}
 

 

OK。

 

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