Java--Filter过滤器防止XSS SQL注入
【摘要】
一、攻击说明
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...
一、攻击说明
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。
二、解决办法
Step1：过滤器类XssAndSqlFilter.java
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package com.cup.cms.web.framework.filter;
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import java.io.IOException;
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import javax.servlet.Filter;
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import javax.servlet.FilterChain;
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import javax.servlet.FilterConfig;
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import javax.servlet.ServletException;
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import javax.servlet.ServletRequest;
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import javax.servlet.ServletResponse;
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import javax.servlet.http.HttpServletRequest;
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/**
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* @Author Justin
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* @Date 2017年11月11日
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*/
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public class XssAndSqlFilter implements Filter {
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@Override
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public void destroy() {
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// TODO Auto-generated method stub
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}
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@Override
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public void doFilter(ServletRequest request, ServletResponse response,
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FilterChain chain) throws IOException, ServletException {
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XssAndSqlHttpServletRequestWrapper xssRequest = new XssAndSqlHttpServletRequestWrapper(
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(HttpServletRequest) request);
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chain.doFilter(xssRequest, response);
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}
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@Override
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public void init(FilterConfig arg0) throws ServletException {
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// TODO Auto-generated method stub
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}
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}
Step2：包装器类XssAndSqlHttpServletRequestWrapper.java
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package com.cup.cms.web.framework.filter;
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import java.util.regex.Pattern;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletRequestWrapper;
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/**
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* @Author Justin
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* @Date 2017年11月11日
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*/
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public class XssAndSqlHttpServletRequestWrapper extends
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HttpServletRequestWrapper {
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HttpServletRequest orgRequest = null;
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public XssAndSqlHttpServletRequestWrapper(HttpServletRequest request) {
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super(request);
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orgRequest = request;
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}
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/**
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* 覆盖getParameter方法，将参数名和参数值都做xss & sql过滤。
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* 如果需要获得原始的值，则通过super.getParameterValues(name)来获取
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* getParameterNames,getParameterValues和getParameterMap也可能需要覆盖
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*/
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@Override
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public String getParameter(String name) {
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String value = super.getParameter(xssEncode(name));
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if (value != null) {
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value = xssEncode(value);
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}
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return value;
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}
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/**
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* 覆盖getHeader方法，将参数名和参数值都做xss & sql过滤。
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* 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
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*/
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@Override
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public String getHeader(String name) {
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String value = super.getHeader(xssEncode(name));
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if (value != null) {
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value = xssEncode(value);
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}
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return value;
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}
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/**
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* 将容易引起xss & sql漏洞的半角字符直接替换成全角字符
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*
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* @param s
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* @return
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*/
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private static String xssEncode(String s) {
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if (s == null || s.isEmpty()) {
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return s;
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} else {
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s = stripXSSAndSql(s);
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}
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StringBuilder sb = new StringBuilder(s.length() + 16);
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for (int i = 0; i < s.length(); i++) {
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char c = s.charAt(i);
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switch (c) {
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case '>':
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sb.append("＞");// 转义大于号
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break;
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case '<':
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sb.append("＜");// 转义小于号
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break;
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case '\'':
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sb.append("＇");// 转义单引号
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break;
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case '\"':
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sb.append("＂");// 转义双引号
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break;
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case '&':
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sb.append("＆");// 转义&
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break;
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case '#':
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sb.append("＃");// 转义#
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break;
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default:
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sb.append(c);
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break;
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}
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}
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return sb.toString();
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}
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/**
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* 获取最原始的request
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*
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* @return
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*/
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public HttpServletRequest getOrgRequest() {
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return orgRequest;
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}
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/**
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* 获取最原始的request的静态方法
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*
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* @return
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*/
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public static HttpServletRequest getOrgRequest(HttpServletRequest req) {
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if (req instanceof XssAndSqlHttpServletRequestWrapper) {
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return ((XssAndSqlHttpServletRequestWrapper) req).getOrgRequest();
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}
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return req;
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}
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/**
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*
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* 防止xss跨脚本攻击（替换，根据实际情况调整）
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*/
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public static String stripXSSAndSql(String value) {
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if (value != null) {
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// NOTE: It's highly recommended to use the ESAPI library and
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// uncomment the following line to
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// avoid encoded attacks.
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// value = ESAPI.encoder().canonicalize(value);
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// Avoid null characters
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/** value = value.replaceAll("", ""); ***/
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// Avoid anything between script tags
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Pattern scriptPattern = Pattern
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.compile(
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"<[\r\n| | ]*script[\r\n| | ]*>(.*?)</[\r\n| | ]*script[\r\n| | ]*>",
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Pattern.CASE_INSENSITIVE);
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value = scriptPattern.matcher(value).replaceAll("");
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// Avoid anything in a
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// src="http://www.yihaomen.com/article/java/..." type of
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// e-xpression
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scriptPattern = Pattern.compile(
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"src[\r\n| | ]*=[\r\n| | ]*[\\\"|\\\'](.*?)[\\\"|\\\']",
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Pattern.CASE_INSENSITIVE | Pattern.MULTILINE
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| Pattern.DOTALL);
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value = scriptPattern.matcher(value).replaceAll("");
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// Remove any lonesome </script> tag
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scriptPattern = Pattern.compile("</[\r\n| | ]*script[\r\n| | ]*>",
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Pattern.CASE_INSENSITIVE);
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value = scriptPattern.matcher(value).replaceAll("");
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// Remove any lonesome <script ...> tag
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scriptPattern = Pattern.compile("<[\r\n| | ]*script(.*?)>",
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Pattern.CASE_INSENSITIVE | Pattern.MULTILINE
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| Pattern.DOTALL);
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value = scriptPattern.matcher(value).replaceAll("");
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// Avoid eval(...) expressions
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scriptPattern = Pattern.compile("eval\\((.*?)\\)",
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Pattern.CASE_INSENSITIVE | Pattern.MULTILINE
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| Pattern.DOTALL);
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value = scriptPattern.matcher(value).replaceAll("");
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// Avoid e-xpression(...) expressions
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scriptPattern = Pattern.compile("e-xpression\\((.*?)\\)",
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Pattern.CASE_INSENSITIVE | Pattern.MULTILINE
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| Pattern.DOTALL);
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value = scriptPattern.matcher(value).replaceAll("");
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// Avoid javascript:... expressions
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scriptPattern = Pattern.compile(
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"javascript[\r\n| | ]*:[\r\n| | ]*",
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Pattern.CASE_INSENSITIVE);
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value = scriptPattern.matcher(value).replaceAll("");
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// Avoid vbscript:... expressions
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scriptPattern = Pattern.compile("vbscript[\r\n| | ]*:[\r\n| | ]*",
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Pattern.CASE_INSENSITIVE);
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value = scriptPattern.matcher(value).replaceAll("");
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// Avoid onload= expressions
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scriptPattern = Pattern.compile("onload(.*?)=",
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Pattern.CASE_INSENSITIVE | Pattern.MULTILINE
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| Pattern.DOTALL);
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value = scriptPattern.matcher(value).replaceAll("");
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}
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return value;
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}
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}
Step3：项目添加配置WEB-INF/web.xml
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<!-- 解决xss & sql漏洞 -->
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<filter>
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<filter-name>xssAndSqlFilter</filter-name>
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<filter-class>com.cup.cms.web.framework.filter.XssAndSqlFilter</filter-class>
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</filter>
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<!-- 解决xss & sql漏洞 -->
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<filter-mapping>
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<filter-name>xssAndSqlFilter</filter-name>
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<url-pattern>*</url-pattern>
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</filter-mapping>
文章来源: blog.csdn.net，作者：吾日三省贾斯汀，版权归原作者所有，如需转载，请联系作者。
原文链接：blog.csdn.net/JustinQin/article/details/78563497
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