防止web端脚本攻击的过滤器（可过滤大部分脚本攻击）
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在后台进行攻击拦截是必要的，下面是我所使用的防止web端脚本攻击的过滤器工具。
1.配置文件：
1 <!-- 请求拦截 --> 2 <mvc:interceptors> 3 <mvc:interceptor> 4 <mvc:mapping path="/**"/> 5 <bean class="com.demo.filter.UserAuthorityInterceptor"></bean> 6 </mvc:interceptor> 7 </mvc:interceptors>
2.拦截器：
1 package com.demo.filter; 2 3 import java.io.BufferedReader; 4 import java.io.InputStream; 5 import java.io.InputStreamReader; 6 import java.net.URLDecoder; 7 import java.util.Enumeration; 8 import java.util.HashMap; 9 import java.util.Iterator; 10 import java.util.LinkedHashMap; 11 import java.util.List; 12 import java.util.Map; 13 14 import javax.annotation.Resource; 15 import javax.servlet.http.HttpServletRequest; 16 import javax.servlet.http.HttpServletResponse; 17 import javax.servlet.http.HttpSession; 18 19 import org.springframework.web.servlet.handler.HandlerInterceptorAdapter; 25 31 public class UserAuthorityInterceptor extends HandlerInterceptorAdapter { 32 33 @Override 34 public boolean preHandle(HttpServletRequest request,HttpServletResponse response, Object handler) throws Exception { 35 36 Map mapReg = new HashMap(); 37 mapReg.put("script", ".*<.*script.*>.*"); 38 mapReg.put("alert", ".*alert\\(.*?\\).*"); 39 // mapReg.put("href=", ".*<.*href=.*>.*"); 40 mapReg.put("textarea", ".*<.*textarea.*>.*"); 41 mapReg.put("onmouseover", ".*onmouseover.*"); 42 mapReg.put("iframe", ".*<.*iframe.*>.*"); 43 mapReg.put("object data=data:text/html", ".*object data=data:text/html.*"); 44 Map<String, Object> map =getRequestParamMap(request); 45 Iterator<String> itfilter= mapReg.keySet().iterator(); 46 for(String key:map.keySet()){ 47 Object parString=map.get(key); 48 if(parString==null){ 49 return true; 50 } 51 String b=parString.toString(); 52 itfilter= mapReg.keySet().iterator(); 53 while(itfilter.hasNext()){ 54 String a=(String)mapReg.get(itfilter.next()); 55 if(b.matches(a)){ 56 System.out.println(a.toUpperCase()); 57 System.out.println(b.toUpperCase()); 58 response.setContentType("text/html;charset=UTF-8"); 59 response.getWriter().write("<html><body><script type=\"text/javascript\">alert(‘请勿进行非法操作！非法的参数是："+a+"‘)</script></body></html>"); 60 return false; 61 } 62 63 } 64 } 65 return true; 66 } 67 68 /** 69 * 从请求中获取所有参数（当参数名重复时，用后者覆盖前者） 70 */ 71 public static Map<String, Object> getRequestParamMap(HttpServletRequest request) { 72 Map<String, Object> paramMap = new LinkedHashMap<String, Object>(); 73 try { 74 String method = request.getMethod(); 75 if (method.equalsIgnoreCase("put") || method.equalsIgnoreCase("delete")) { 76 String queryString = URLDecoder.decode(getString(request.getInputStream()),"UTF-8"); 77 if ("".equals(queryString)) { 78 String[] qsArray = queryString.split("&") ;//StringUtil.splitString(queryString, "&"); 79 if (qsArray.length>0) { 80 for (String qs : qsArray) { 81 String[] array = queryString.split("=") ;//StringUtil.splitString(qs, "="); 82 if (array.length>0 && array.length == 2) { 83 String paramName = array[0].trim(); 84 String paramValue = array[1].trim(); 85 if (checkParamName(paramName)) { 86 if (paramMap.containsKey(paramName)) { 87 paramValue = paramMap.get(paramName) + String.valueOf((char) 29) + paramValue; 88 } 89 paramMap.put(paramName, paramValue); 90 } 91 } 92 } 93 } 94 } 95 } else { 96 Enumeration<String> paramNames = request.getParameterNames(); 97 while (paramNames.hasMoreElements()) { 98 String paramName = paramNames.nextElement(); 99 if (checkParamName(paramName)) { 100 String[] paramValues = request.getParameterValues(paramName); 101 if (paramValues.length>0) { 102 if (paramValues.length == 1) { 103 paramMap.put(paramName, paramValues[0]); 104 } else { 105 StringBuilder paramValue = new StringBuilder(""); 106 for (int i = 0; i < paramValues.length; i++) { 107 paramValue.append(paramValues[i]); 108 if (i != paramValues.length - 1) { 109 paramValue.append(String.valueOf((char) 29)); 110 } 111 } 112 paramMap.put(paramName, paramValue.toString()); 113 } 114 } 115 } 116 } 117 } 118 } catch (Exception e) { 119 throw new RuntimeException(e); 120 } 121 return paramMap; 122 } 123 124 /** 125 * 从输入流中获取字符串 126 */ 127 public static String getString(InputStream is) { 128 StringBuilder sb = new StringBuilder(); 129 try { 130 BufferedReader reader = new BufferedReader(new InputStreamReader(is)); 131 String line; 132 while ((line = reader.readLine()) != null) { 133 sb.append(line); 134 } 135 } catch (Exception e) { 136 e.printStackTrace(); 137 throw new RuntimeException(e); 138 } 139 return sb.toString(); 140 } 141 private static boolean checkParamName(String paramName) { 142 return !paramName.equals("_"); // 忽略 jQuery 缓存参数 143 } 144 public static void main(String[] args) { 145 String a="88888 onmouseover=prompt(42873) bad="; 146 String b=".*onmouseover.*"; 147 System.out.println(a.matches(b)); 148 149 150 } 151 }
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