XSS漏洞防护

主要是添加黑名单进行拦截

public class XSSFilter implements Filter {
    private final Log logger = LogFactory.getLog(XSSFilter.class);
    
     // XSS处理Map
    private static  Map<String,String> xssMap = new HashMap<String,String>();
    public void init(FilterConfig filterConfig) throws ServletException {
        
        // 含有脚本： script
        xssMap.put("[s|S][c|C][r|R][i|C][p|P][t|T]", "");
        
        /*16进制的javascript : 6a617661736372697074
             (\\\\x6a|\\\\x4a)  表示的正则含义为  (\x6a|\x4a)
          */ 
        xssMap.put("((\\\\x6a|\\\\x4a)(\\\\x61|\\\\x41)(\\\\x76|\\\\x56)(\\\\x61|\\\\x41)(\\\\x73|\\\\x53)|(\\\\x63|\\\\x43)(\\\\x72|\\\\x52)(\\\\x69|\\\\x49)(\\\\x70|\\\\x50)(\\\\x74|\\\\x54))", "");
        
        /*16进制的script : 736372697074
         (\\\\x6a|\\\\x4a)  表示的正则含义为  (\x6a|\x4a)
         */ 
        xssMap.put("((\\\\x73|\\\\x53)|(\\\\x63|\\\\x43)(\\\\x72|\\\\x52)(\\\\x69|\\\\x49)(\\\\x70|\\\\x50)(\\\\x74|\\\\x54))", "");

        
        // 含有脚本 javascript
        xssMap.put("[\\\"\\\'][\\s]*[j|J][a|A][v|V][a|A][s|S][c|C][r|R][i|I][p|P][t|T]:(.*)[\\\"\\\']", "\"\"");

        // 含有函数： eval
        xssMap.put("[e|E][v|V][a|A][l|L]\\((.*)\\)", "");
        
        // 含有符号 (
        xssMap.put("\\(", "（");

        // 含有符号 )
        xssMap.put("\\)", "）");

    }

    public void destroy() {

    }

    public void doFilter(ServletRequest request, ServletResponse response,

            FilterChain chain) throws IOException, ServletException {
        chain.doFilter(new XssHttpServletRequestWrapper((HttpServletRequest) request , xssMap), response);
    }
}

Filter

package com.ulic.misp.wx.oauth2;

import java.util.Map;
import java.util.Set;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

import com.ulic.misp.pub.framework.log.Log;
import com.ulic.misp.pub.framework.log.LogFactory;

public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper {

    private final Log logger = LogFactory.getLog(XssHttpServletRequestWrapper.class);
    private Map<String, String> xssMap;

    public XssHttpServletRequestWrapper(HttpServletRequest request) {

        super(request);

    }

    public XssHttpServletRequestWrapper(HttpServletRequest request,

            Map<String, String> xssMap) {

        super(request);

        this.xssMap = xssMap;

    }
    
    @Override
    public String getQueryString() {
        String queryString =  super.getQueryString();
        if(queryString==null){
            return null;
        }
        queryString = cleanXSS(queryString);
        logger.info("queryString :{}",queryString);
        return queryString;
    }
    
    @Override
    public String[] getParameterValues(String parameter) {

        String[] values = super.getParameterValues(parameter);

        if (values == null) {

            return null;

        }

        int count = values.length;

        // 遍历每一个参数，检查是否含有

        String[] encodedValues = new String[count];

        for (int i = 0; i < count; i++) {

            encodedValues[i] = cleanXSS(values[i]);

        }

        return encodedValues;

    }

    @Override

    public String getParameter(String parameter) {

        String value = super.getParameter(parameter);

        if (value == null) {

            return null;

        }

        return cleanXSS(value);

    }
    

    public String getHeader(String name) {

        String value = super.getHeader(name);

        if (value == null)

            return null;

        return cleanXSS(value);

    }

    /**
     * 
     * 清除恶意的XSS脚本
     *
     * 
     * 
     * @param value
     * 
     * @return
     * 
     */

    private String cleanXSS(String value) {

        Set<String> keySet = xssMap.keySet();

        for (String key : keySet) {

            String v = xssMap.get(key);

            value = value.replaceAll(key, v);

        }
        return value;

    }
}

重写请求的一些处理