360[警告]跨站脚本攻击漏洞/java web利用Filter防止XSS/Spring MVC防止XSS攻击

2022-09-20 10:50:32

就以这张图片作为开篇和问题引入吧

<options>问题解决办法请参考上一篇

如何获取360站长邀请码，360网站安全站长邀请码

首先360能够提供一个这样平台去检测还是不错的。但是当体检出来看到漏洞报告，以为360会像windows上360安全卫士一样帮我们打好补丁。但是实际发现漏洞是要自己修复,并且php和asp aspx有360提供的补丁或者解决方案（想要看这些方案之前要申请为站长但是需要邀请码这个可以在页面页面左下角 360主机卫士感恩卡里面领取）。

进入修复方案后发现java几乎没有提供一些建议，只能自己处理。开始使用搜索引擎搜索 java防止xss攻击代码。

http://www.yihaomen.com/article/java/409.htm

查到了这个方案

. 可以采用spring 里面提供的工具类来实现.

一，第一种方法。

public class XSSFilter implements Filter {

    @Override

    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override

    public void destroy() {

    }

    @Override

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)

        throws IOException, ServletException {

        chain.doFilter(new XSSRequestWrapper((HttpServletRequest) request), response);

    }

}

再实现 ServletRequest 的包装类

import java.util.regex.Pattern;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletRequestWrapper;

public class XSSRequestWrapper extends HttpServletRequestWrapper {

    public XSSRequestWrapper(HttpServletRequest servletRequest) {

        super(servletRequest);

    }

    @Override

    public String[] getParameterValues(String parameter) {

        String[] values = super.getParameterValues(parameter);

        if (values == null) {

            return null;

        }

        int count = values.length;

        String[] encodedValues = new String[count];

        for (int i = 0; i < count; i++) {

            encodedValues[i] = stripXSS(values[i]);

        }

        return encodedValues;

    }

    @Override

    public String getParameter(String parameter) {

        String value = super.getParameter(parameter);

        return stripXSS(value);

    }

    @Override

    public String getHeader(String name) {

        String value = super.getHeader(name);

        return stripXSS(value);

    }

    private String stripXSS(String value) {

        if (value != null) {

            // NOTE: It's highly recommended to use the ESAPI library and uncomment the following line to

            // avoid encoded attacks.

            // value = ESAPI.encoder().canonicalize(value);

            // Avoid null characters

            value = value.replaceAll("", "");

            // Avoid anything between script tags

            Pattern scriptPattern = Pattern.compile("<script>(.*?)</script>", Pattern.CASE_INSENSITIVE);

            value = scriptPattern.matcher(value).replaceAll("");

            // Avoid anything in a src='...' type of expression

            scriptPattern = Pattern.compile("src[\r\n]*=[\r\n]*\\\'(.*?)\\\'", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);

            value = scriptPattern.matcher(value).replaceAll("");

            scriptPattern = Pattern.compile("src[\r\n]*=[\r\n]*\\\"(.*?)\\\"", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);

            value = scriptPattern.matcher(value).replaceAll("");

            // Remove any lonesome </script> tag

            scriptPattern = Pattern.compile("</script>", Pattern.CASE_INSENSITIVE);

            value = scriptPattern.matcher(value).replaceAll("");

            // Remove any lonesome <script ...> tag

            scriptPattern = Pattern.compile("<script(.*?)>", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);

            value = scriptPattern.matcher(value).replaceAll("");

            // Avoid eval(...) expressions

            scriptPattern = Pattern.compile("eval\\((.*?)\\)", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);

            value = scriptPattern.matcher(value).replaceAll("");

            // Avoid expression(...) expressions

            scriptPattern = Pattern.compile("expression\\((.*?)\\)", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);

            value = scriptPattern.matcher(value).replaceAll("");

            // Avoid javascript:... expressions

            scriptPattern = Pattern.compile("javascript:", Pattern.CASE_INSENSITIVE);

            value = scriptPattern.matcher(value).replaceAll("");

            // Avoid vbscript:... expressions

            scriptPattern = Pattern.compile("vbscript:", Pattern.CASE_INSENSITIVE);

            value = scriptPattern.matcher(value).replaceAll("");

            // Avoid onload= expressions

            scriptPattern = Pattern.compile("onload(.*?)=", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);

            value = scriptPattern.matcher(value).replaceAll("");

        }

        return value;

    }

}

还需要到web.xml里面配置

<filter>

    <filter-name>XSSFilter</filter-name>

    <filter-class>com.shanheyongmu.XSSFilter</filter-class>

</filter>

<filter-mapping>

    <filter-name>XSSFilter</filter-name>

    <url-pattern>/*</url-pattern>

</filter-mapping>

放上去之后出现了 Java.lang.UnsupportedClassVersionError还是classnotfound 项目跑起来就是首页404。然后考虑了下linux环境是jdk 1.6而编译的都是maven3.3.0以后版本以及使用的jdk 1.7 版本问题（版本切换步骤可以参考【maven学习总结】里面的execption ,版本之前工作中遇到过所以有印象）重新换jdk和eclipse设置jdk都是1.6之后编译。不报错了shell上，但是用360快速检测我已修复，还是存在漏洞。于是继续百度

http://www.what21.com/programming/java/javaweb-summary/xss3.html 发现了不同的XssFilter写法，尝试之后还是失败。

https://my.oschina.net/wanglu/blog/267069 Springmvc安全，尝试之后失败，当然有些人视图解析器不同无加spring 的form标签无法尝试。

http://www.cnblogs.com/Mainz/archive/2012/11/01/2749874.html 来到了本篇本篇有3种解决方法

第二种方法

web.xml加上：

       <context-param>

 <param-name>defaultHtmlEscape</param-name>

 <param-value>true</param-value>

 </context-param>

Forms加上：很多人对forms到底是哪里不理解你可以加在<form>标签之前或者body之前

<spring:htmlEscape defaultHtmlEscape="true" />

因为是线上项目所以无法采用以下标签 https://my.oschina.net/wanglu/blog/267069

也就是spring的标签

<form:input path="someFormField" htmlEscape="true" />

但是<spring:htmlEscape defaultHtmlEscape="true" />在jsp视图解析中还是可以的，并且这个添加方法可以不改变原有项目。

全部部署完成后，遗憾的是还是体检有原有漏洞。

从这篇得到了答案并且修复了 http://huangpengpeng.iteye.com/blog/2091798

 <!--@分隔 -->

    <filter>

        <filter-name>xssFilter</filter-name>

        <filter-class>com.yoro.core.web.XssFilter</filter-class>

        <init-param>

            <param-name>SplitChar</param-name>

            <param-value>@</param-value>

        </init-param>

        <init-param>

            <param-name>FilterChar</param-name>

            <param-value>>@&lt;@\'@\"@\\@#@(@)</param-value>

        </init-param>

        <init-param>

            <param-name>ReplaceChar</param-name>

            <param-value>＞'@＜@‘@“@＼@＃@（@）</param-value>

        </init-param>

    </filter>  

 <filter-mapping>  

        <filter-name>xssFilter</filter-name>  

  <url-pattern>/*</url-pattern>  

    </filter-mapping>

package com.yoro.core.web;  

/**

 * @author zoro

 */

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 javax.servlet.http.HttpServletRequest;  

public class XssFilter implements Filter {  

    private String filterChar;

    private String replaceChar;

    private String splitChar;

    FilterConfig filterConfig = null;

    public void init(FilterConfig filterConfig) throws ServletException {

        this.filterChar=filterConfig.getInitParameter("FilterChar");

        this.replaceChar=filterConfig.getInitParameter("ReplaceChar");

        this.splitChar=filterConfig.getInitParameter("SplitChar");

        this.filterConfig = filterConfig;

    }  

    public void destroy() {

        this.filterConfig = null;

    }  

    public void doFilter(ServletRequest request, ServletResponse response,  

    FilterChain chain) throws IOException, ServletException {

        chain.doFilter(new XssHttpServletRequestWrapper((HttpServletRequest) request,filterChar,replaceChar,splitChar), response);

    }

}

package com.yoro.core.web;  

import java.io.UnsupportedEncodingException;

import java.net.URLDecoder;  

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletRequestWrapper;  

/**

 * @author zoro

 */

public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper {

    private String[]filterChars;

    private String[]replaceChars;

    public XssHttpServletRequestWrapper(HttpServletRequest request,String filterChar,String replaceChar,String splitChar) {

        super(request);

        if(filterChar!=null&&filterChar.length()>0){

            filterChars=filterChar.split(splitChar);

        }

        if(replaceChar!=null&&replaceChar.length()>0){

            replaceChars=replaceChar.split(splitChar);

        }

    }

    public String getQueryString() {

        String value = super.getQueryString();

        if (value != null) {

            value = xssEncode(value);

        }

        return value;

    }  

    /**

     * 覆盖getParameter方法，将参数名和参数值都做xss过滤。<br/>

     * 如果需要获得原始的值，则通过super.getParameterValues(name)来获取<br/>

     * getParameterNames,getParameterValues和getParameterMap也可能需要覆盖

     */

    public String getParameter(String name) {

        String value = super.getParameter(xssEncode(name));

        if (value != null) {

            value = xssEncode(value);

        }

        return value;

    }  

    public String[] getParameterValues(String name) {

        String[]parameters=super.getParameterValues(name);

        if (parameters==null||parameters.length == 0) {

            return null;

        }

        for (int i = 0; i < parameters.length; i++) {

            parameters[i] = xssEncode(parameters[i]);

        }

        return parameters;

    }  

    /**

     * 覆盖getHeader方法，将参数名和参数值都做xss过滤。<br/>

     * 如果需要获得原始的值，则通过super.getHeaders(name)来获取<br/> getHeaderNames 也可能需要覆盖

     */

    public String getHeader(String name) {  

        String value = super.getHeader(xssEncode(name));

        if (value != null) {

            value = xssEncode(value);

        }

        return value;

    }  

    /**

     * 将容易引起xss漏洞的半角字符直接替换成全角字符

     *

     * @param s

     * @return

     */

    private  String xssEncode(String s) {

        if (s == null || s.equals("")) {

            return s;

        }

        try {

            s = URLDecoder.decode(s, "UTF-8");

        } catch (UnsupportedEncodingException e) {

            e.printStackTrace();

        }

        for (int i = 0; i < filterChars.length; i++) {

            if(s.contains(filterChars[i])){

                s=s.replace(filterChars[i], replaceChars[i]);

            }

        }

        return s;

    }

}

由于尝试较多，也比较混乱，也不确定哪个适用各位的情况，只能多查多参考。

此处再补充一个其他防止Xss攻击代码写法 http://www.what21.com/programming/java/javaweb-summary/xss3.html。

后来搜索到了 http://www.cnblogs.com/wangdaijun/p/5652864.html Antisamy项目实现防XSS攻击

遗憾的是配置文件很难找我在csdn找到了antisamy.xml，大家可以基于搜索关键字 Antisamy项目实现防XSS攻击多查查。

小弟技术菜，并且思维一般，求大神勿喷，给予指导和共同交流进步还是可以的。

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