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:
<!-- 解决xss & sql漏洞 --> <filter> <filter-name>xssAndSqlFilter</filter-name> <filter-class>com.cup.cms.web.framework.filter.XssAndSqlFilter</filter-class> </filter> <!-- 解决xss & sql漏洞 --> <filter-mapping> <filter-name>xssAndSqlFilter</filter-name> <url-pattern>*</url-pattern> </filter-mapping>
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。<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 */ @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。<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 */ @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| | ]*>(.*?)</[\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 </script> tag scriptPattern = Pattern.compile("</[\r\n| | ]*script[\r\n| | ]*>", Pattern.CASE_INSENSITIVE); value = scriptPattern.matcher(value).replaceAll(""); // Remove any lonesome <script ...> tag scriptPattern = Pattern.compile("<[\r\n| | ]*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 e-xpression(...) expressions scriptPattern = Pattern.compile("e-xpression\\((.*?)\\)", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL); value = scriptPattern.matcher(value).replaceAll(""); // Avoid javascript:... expressions scriptPattern = Pattern.compile("javascript[\r\n| | ]*:[\r\n| | ]*", Pattern.CASE_INSENSITIVE); value = scriptPattern.matcher(value).replaceAll(""); // Avoid vbscript:... expressions scriptPattern = Pattern.compile("vbscript[\r\n| | ]*:[\r\n| | ]*", 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; } }
当这样子配置之后 ,可以有效防止大部分的xss攻击。
转载自:http://blog.csdn.net/hithedy/article/details/50630109
人要耐得住寂寞,才能守得住繁华。人生最痛苦的就是拿不起放不下,不属于自己的快乐,及时放手也许是一种解脱,生活中没有谁对谁错,只有适不适合。当发现很多已经改变,更要面对的是事实。