跨站点请求伪造 跨站点脚本编制 通过框架钓鱼漏洞

1、跨站点请求伪造 跨站点脚本编制 通过框架钓鱼漏洞

主要是通过在url或参数中添加脚本如：

1、URL中添加<script>alert(1)</script>

2、参数value=<a href="http://demo.com"></a>。

添加一个过滤器对特殊字符进行拦截

[java] view
plaincopy

package com.xxx.sys.filter;



import java.io.IOException;

import java.util.Enumeration;



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;

import javax.servlet.http.HttpServletResponse;



import org.apache.log4j.Logger;



/**

* 非法字符过滤器

* 1.所有非法字符配置在web.xml中，如需添加新字符，请自行配置

* 2.请注意请求与相应时的编码格式设置，否则遇到中文时，会出现乱码(GBK与其子集应该没问题)

* @author lee

*

*/

public class CharFilter implements Filter {

private Logger log = Logger.getLogger(CharFilter.class);

private String encoding;

private String[] legalNames;

private String[] illegalChars;



public void init(FilterConfig filterConfig) throws ServletException {

encoding = filterConfig.getInitParameter("encoding");

legalNames = filterConfig.getInitParameter("legalNames").split(",");

illegalChars = filterConfig.getInitParameter("illegalChars").split(",");

}



public void destroy() {

encoding = null;

legalNames = null;

illegalChars = null;

}





public void doFilter(ServletRequest request, ServletResponse response,

FilterChain filterChain) throws IOException, ServletException {



HttpServletRequest req = (HttpServletRequest)request;

HttpServletResponse res = (HttpServletResponse) response;



//必须手动指定编码格式

req.setCharacterEncoding(encoding);

String tempURL = req.getRequestURI();

log.info(tempURL);

Enumeration params = req.getParameterNames();



//是否执行过滤 true：执行过滤 false：不执行过滤

boolean executable = true;



//非法状态 true：非法 false；不非法

boolean illegalStatus = false;

String illegalChar = "";

//对参数名与参数进行判断

w:while(params.hasMoreElements()){



String paramName = (String) params.nextElement();



executable = true;



//密码不过滤

if(paramName.toLowerCase().contains("password")){

executable = false;

}else{

//检查提交参数的名字，是否合法，即不过滤其提交的值

f:for(int i=0;i<legalNames.length;i++){

if(legalNames[i].equals(paramName)){

executable = false;

break f;

}

}

}



if(executable){

String[] paramValues = req.getParameterValues(paramName);



f1:for(int i=0;i<paramValues.length;i++){



String paramValue = paramValues[i];



f2:for(int j=0;j<illegalChars.length;j++){



illegalChar = illegalChars[j];



if(paramValue.indexOf(illegalChar) != -1){

illegalStatus = true;//非法状态

break f2;

}

}



if(illegalStatus){

break f1;

}



}

}



if(illegalStatus){

break w;

}

}

//对URL进行判断

for(int j=0;j<illegalChars.length;j++){



illegalChar = illegalChars[j];



if(tempURL.indexOf(illegalChar) != -1){

illegalStatus = true;//非法状态

break;

}

}

if(illegalStatus){

//必须手动指定编码格式

res.setContentType("text/html;charset="+encoding);

res.setCharacterEncoding(encoding);

res.getWriter().print("<script>window.alert('当前链接中存在非法字符');window.history.go(-1);</script>");

}else{

filterChain.doFilter(request, response);

}

}



}

web.xml code

[html] view
plaincopy

<filter>

<filter-name>charFilter</filter-name>

<filter-class>com.xxx.sys.filter.CharFilter</filter-class>

<init-param>

<param-name>encoding</param-name>

<param-value>UTF-8</param-value>

</init-param>

<init-param>

<param-name>legalNames</param-name>

<param-value>content1,ver,historyURL,listURL</param-value>

</init-param>

<init-param>

<param-name>illegalChars</param-name>

<param-value>|,$,@,',",\',\",<,>,(,),+,CR,LF,\",",\,http</param-value>

</init-param>

</filter>