shiro安全框架扩展教程--如何防止可执行文件的入侵攻击

        前面的教程有一章是讲解如何突破上传的,当被人通过上传功能突破的防线那就杯具了,有点hack知识的人都知道,很多攻击都是优先寻找上传的功能,因为能突破

就会剩下很多的功夫,比如hack上传了一个asp,php或者jsp文件,然后通过抓包路径获取了文件存放地址,然后直接请求就能通过这个可执行的文件获取到数据库的信息,

或者是遍历目录下载文件,寻找文件中的其他漏洞以获得更高的权限,下面我就演示下简单的防范手段,就算被突破了上传也会有下一堵墙在一定程度上防止执行脚本

我主要是使用shiro写了一个filter过滤需要请求信息,如遇到黑名单则记录信息,看下面贴的代码

package com.silvery.security.shiro.filter;import java.text.SimpleDateFormat;import java.util.Date;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.http.HttpServletRequest;import org.apache.shiro.web.filter.authz.AuthorizationFilter;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import com.silvery.utils.PatternUtils;import com.silvery.utils.WebUtils;/** *  * 黑名单可执行程序请求过滤器 *  * @author shadow *  */public class SimpleExecutiveFilter extends AuthorizationFilter {protected static final String[] blackUrlPathPattern = new String[] { "*.aspx*", "*.asp*", "*.php*", "*.exe*","*.jsp*", "*.pl*", "*.py*", "*.groovy*", "*.sh*", "*.rb*", "*.dll*", "*.bat*", "*.bin*", "*.dat*","*.bas*", "*.c*", "*.cmd*", "*.com*", "*.cpp*", "*.jar*", "*.class*", "*.lnk*" };private static final Logger log = LoggerFactory.getLogger(SimpleExecutiveFilter.class);@Overrideprotected boolean isAccessAllowed(ServletRequest request, ServletResponse response, Object obj) throws Exception {HttpServletRequest httpRequest = (HttpServletRequest) request;String reqUrl = httpRequest.getRequestURI().toLowerCase().trim();for (String pattern : blackUrlPathPattern) {if (PatternUtils.simpleMatch(pattern, reqUrl)) {log.error(new StringBuffer().append("unsafe request >>> ").append(" request time: ").append(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date())).append("; request ip: ").append(WebUtils.getClientIP()).append("; request url: ").append(httpRequest.getRequestURI()).toString());return false;}}return true;}}

下一步把刚刚写的过滤器配置到shiro的过滤链中

<!-- 过滤链配置 --><bean id="shiroFilter" class="org.apache.shiro.spring.web.ShiroFilterFactoryBean"><property name="securityManager" ref="securityManager" /><property name="loginUrl" value="/" /><property name="successUrl" value="/cms/index.do" /><property name="unauthorizedUrl" value="/static/unauthorized.html" /><property name="filters"><map><entry key="role"><beanclass="com.silvery.security.shiro.filter.SimpleRoleAuthorizationFilter" /></entry><entry key="authc"><beanclass="com.silvery.security.shiro.filter.SimpleFormAuthenticationFilter" /></entry><entry key="exec"><bean class="com.silvery.security.shiro.filter.SimpleExecutiveFilter" /></entry></map></property></bean>

最后配置下我们需要过滤的请求目录,一般都是全量过滤,但是有些静态资源是不应该过滤的,所以应该注意顺序,让anon权限的放到放到exec的前面

<!-- 权限资源配置 --><bean id="filterChainDefinitionsService"class="com.silvery.security.shiro.service.impl.SimpleFilterChainDefinitionsService"><property name="definitions"><value>/static/** = anon/** = exec</value></property></bean>

最后请求下php,jsp等那些文件是返回到无权限的页面,我们的简单防范已经达到目的了,下一章节可能讲如何防范xss和csrf攻击的防范