URL存在跨站漏洞http host头攻击漏洞解决方案

package com.founder.mrp.web.filter;

import java.util.regex.Pattern;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper {
    
HttpServletRequest orgRequest = null;
    
    public XssHttpServletRequestWrapper(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;
    }
    
    @Override
    public String[] getParameterValues(String name) {
        String[] values = super.getParameterValues(xssEncode(name));
         if(values != null && values.length > 0){
             for(int i =0; i< values.length ;i++){
                 values[i] = xssEncode(values[i]);
             }
         }
        return values;
    }

    /**
     * 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());
        for (int i = 0; i < s.length(); i++) {
            char c = s.charAt(i);
            switch (c) {
            case ‘<‘:
                sb.append("＜");
                break;
            case ‘>‘:
                sb.append("＞");
                break;            
            case ‘(‘:
                sb.append("（");
                break;
            case ‘)‘:
                sb.append("）");
                break;
            case ‘&‘:
                sb.append("＆");
                break;
            case ‘|‘:  
                sb.append("｜");
                break;
            case ‘+‘:
                sb.append("＋");
                break;
            case ‘%‘:
                sb.append("％");
                break;
            case ‘@‘:  
                sb.append("＠");
                break;    
            case ‘$‘:
                sb.append("＄");
                break;
            case ‘#‘:
                sb.append("＃");
                break;    
            case ‘\‘‘:
                sb.append("＇");// 转义单引号
                break;
            case ‘\"‘:
                sb.append("＂");// 转义双引号
                break;
            case ‘\\‘:
                sb.append("＼");//全角斜线
                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 XssHttpServletRequestWrapper) {
            return ((XssHttpServletRequestWrapper) 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="..." 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("");
            // Remove any lonesome <script ...> tag
            scriptPattern = Pattern.compile("<iframe>(.*?)</iframe>",Pattern.CASE_INSENSITIVE);
            value = scriptPattern.matcher(value).replaceAll("");
            scriptPattern = Pattern.compile("</iframe>",Pattern.CASE_INSENSITIVE);
            value = scriptPattern.matcher(value).replaceAll("");
            scriptPattern = Pattern.compile("<iframe(.*?)>",Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
            value = scriptPattern.matcher(value).replaceAll("");
        }
        return value;
    }

}