防止常见XSS 过滤 SQL注入 JAVA过滤器filter

XSS : 跨站脚本攻击(Cross Site Scripting),为不和层叠样式表(Cascading Style Sheets, CSS)的缩写混淆,故将跨站脚本攻击缩写为XSS。恶意攻击者往Web页面里插入恶意html代码,当用户浏览该页之时,嵌入其中Web里面的html代码会被执行,从而达到恶意攻击用户的特殊目的。
sql注入
所谓SQL注入,就是通过把SQL命令插入到Web表单提交或输入域名或页面请求的查询字符串,最终达到欺骗服务器执行恶意的SQL命令。具体来说,它是利用现有应用程序,将(恶意)的SQL命令注入到后台数据库引擎执行的能力,它可以通过在Web表单中输入(恶意)SQL语句得到一个存在安全漏洞的网站上的数据库,而不是按照设计者意图去执行SQL语句。
1、首先配置web.xml,添加如下配置信息:

  

xssAndSqlFilter
com.cup.cms.web.framework.filter.XssAndSqlFilter



xssAndSqlFilter
*

2、编写过滤器

/** 
*
*/
package com.cup.cms.web.framework.filter;

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;

/**
* @Author hithedy
* @Date 2016年2月2日
* @Time 下午2:01:53
*/
public class XssAndSqlFilter implements Filter {

@Override
public void destroy() {
// TODO Auto-generated method stub

}

@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
XssAndSqlHttpServletRequestWrapper xssRequest = new XssAndSqlHttpServletRequestWrapper((HttpServletRequest) request);
chain.doFilter(xssRequest, response);
}

@Override
public void init(FilterConfig arg0) throws ServletException {
// TODO Auto-generated method stub

}

}

3、包装器

/**
*
*/
package com.cup.cms.web.framework.filter;

import java.util.regex.Pattern;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

/**
* @Author hithedy
* @Date 2016年2月2日
* @Time 下午2:03:19
*/
public class XssAndSqlHttpServletRequestWrapper extends HttpServletRequestWrapper {

HttpServletRequest orgRequest = null;

public XssAndSqlHttpServletRequestWrapper(HttpServletRequest request) {
super(request);
orgRequest = request;
}

/**
* 覆盖getParameter方法,将参数名和参数值都做xss & sql过滤。

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

* getParameterNames,getParameterValues和getParameterMap也可能需要覆盖
*/
@Override
public String getParameter(String name) {
String value = super.getParameter(xssEncode(name));
if (value != null) {
value = xssEncode(value);
}
return value;
}

/**
* 覆盖getHeader方法,将参数名和参数值都做xss & sql过滤。

* 如果需要获得原始的值,则通过super.getHeaders(name)来获取

* getHeaderNames 也可能需要覆盖
*/
@Override
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 & sql漏洞的半角字符直接替换成全角字符
*
* @param s
* @return
*/
private static String xssEncode(String s) {
if (s == null || s.isEmpty()) {
return s;
}else{
s = stripXSSAndSql(s);
}
StringBuilder sb = new StringBuilder(s.length() + 16);
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
switch (c) {
case '>':
sb.append(">");// 转义大于号
break;
case '<':
sb.append("<");// 转义小于号
break;
case '\'':
sb.append("'");// 转义单引号
break;
case '\"':
sb.append(""");// 转义双引号
break;
case '&':
sb.append("&");// 转义&
break;
case '#':
sb.append("#");// 转义#
break;
default:
sb.append(c);
break;
}
}
return sb.toString();
}

/**
* 获取最原始的request
*
* @return
*/
public HttpServletRequest getOrgRequest() {
return orgRequest;
}

/**
* 获取最原始的request的静态方法
*
* @return
*/
public static HttpServletRequest getOrgRequest(HttpServletRequest req) {
if (req instanceof XssAndSqlHttpServletRequestWrapper) {
return ((XssAndSqlHttpServletRequestWrapper) req).getOrgRequest();
}

return req;
}

/**
*
* 防止xss跨脚本攻击(替换,根据实际情况调整)
*/

public static String stripXSSAndSql(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("<[\r\n| | ]*script[\r\n| | ]*>(.*?)", Pattern.CASE_INSENSITIVE);
value = scriptPattern.matcher(value).replaceAll("");
// Avoid anything in a src="http://www.yihaomen.com/article/java/..." type of e-xpression
scriptPattern = Pattern.compile("src[\r\n| | ]*=[\r\n| | ]*[\\\"|\\\'](.*?)[\\\"|\\\']", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
value = scriptPattern.matcher(value).replaceAll("");
// Remove any lonesome tag
scriptPattern = Pattern.compile("", Pattern.CASE_INSENSITIVE);
value = scriptPattern.matcher(value).replaceAll("");
// Remove any lonesome

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