java 过滤器filter防sql注入

来源：互联网发布：非线性最优化基础编辑：程序博客网时间：2024/05/16 18:33

转自：http://blog.csdn.net/xb12369/article/details/22921629

XSSFilter.java

[java] view plaincopy
public void doFilter(ServletRequest servletrequest,  
            ServletResponse servletresponse, FilterChain filterchain)  
            throws IOException, ServletException {  
          
  
        //flag = true 只做URL验证; flag = false 做所有字段的验证;  
        boolean flag = true;  
        if(flag){  
            //只对URL做xss校验  
            HttpServletRequest httpServletRequest = (HttpServletRequest) servletrequest;  
            HttpServletResponse httpServletResponse = (HttpServletResponse) servletresponse;  
              
            String requesturi = httpServletRequest.getRequestURL().toString();  
            requesturi = URLDecoder.decode(requesturi, "UTF-8");  
            if(requesturi!=null&&requesturi.indexOf("alipay_hotel_book_return.html")!=-1){  
                filterchain.doFilter(servletrequest, servletresponse);  
                return;  
            }  
            if(requesturi!=null&&requesturi.indexOf("account_bank_return.html")!=-1){  
                filterchain.doFilter(servletrequest, servletresponse);  
                return;  
            }  
            if(requesturi!=null&&requesturi.indexOf("/alipay/activity.html")!=-1){  
                filterchain.doFilter(servletrequest, servletresponse);  
                return ;  
            }  
            if(requesturi!=null&&requesturi.indexOf("/alipayLogin.html")!=-1){  
                filterchain.doFilter(servletrequest, servletresponse);  
                return ;  
            }  
            RequestWrapper rw = new RequestWrapper(httpServletRequest);  
            String param =  httpServletRequest.getQueryString();  
            if(!"".equals(param) && param != null) {  
                param = URLDecoder.decode(param, "UTF-8");  
                String originalurl = requesturi + param;  
                  
                String sqlParam = param;  
                //添加sql注入的判断  
                if(requesturi.endsWith("/askQuestion.html") || requesturi.endsWith("/member/answer.html")){  
                    sqlParam = rw.cleanSQLInject(param);  
                }  
                  
                String xssParam = rw.cleanXSS(sqlParam);  
                requesturi += "?"+xssParam;  
                  
                  
                if(!xssParam.equals(param)){  
                    System.out.println("requesturi::::::"+requesturi);  
                    httpServletResponse.sendRedirect(requesturi);  
                    System.out.println("no entered.");  
//                  filterchain.doFilter(new RequestWrapper((HttpServletRequest) servletrequest), servletresponse);  
                    return ;  
                }  
            }  
            filterchain.doFilter(servletrequest, servletresponse);  
        }else{  
              
            //对请求中的所有东西都做校验，包括表单。此功能校验比较严格容易屏蔽表单正常输入，使用此功能请注意。  
            filterchain.doFilter(new RequestWrapper((HttpServletRequest) servletrequest), servletresponse);  
        }  
    }  

requestMapping:

[java] view plaincopy
public RequestWrapper(){  
        super(null);  
    }  
  
    public RequestWrapper(HttpServletRequest httpservletrequest) {  
        super(httpservletrequest);  
    }  
  
    public String[] getParameterValues(String s) {  
        String str[] = super.getParameterValues(s);  
        if (str == null) {  
            return null;  
        }  
        int i = str.length;  
        String as1[] = new String[i];  
        for (int j = 0; j < i; j++) {  
            as1[j] = cleanXSS(cleanSQLInject(str[j]));  
        }  
  
        return as1;  
    }  
  
    public String getParameter(String s) {  
        String s1 = super.getParameter(s);  
        if (s1 == null) {  
            return null;  
        } else {  
            return cleanXSS(cleanSQLInject(s1));  
        }  
    }  
  
    public String getHeader(String s) {  
        String s1 = super.getHeader(s);  
        if (s1 == null) {  
            return null;  
        } else {  
            return cleanXSS(cleanSQLInject(s1));  
        }  
    }  
  
    public String cleanXSS(String src) {  
        String temp =src;  
  
        System.out.println("xss---temp-->"+src);  
        src = src.replaceAll("<", "<").replaceAll(">", ">");  
       // if (src.indexOf("address")==-1)  
    //  {  
          src = src.replaceAll("\\(", "(").replaceAll("\\)", ")");  
        //}  
       
        src = src.replaceAll("'", "'");  
          
        Pattern pattern=Pattern.compile("(eval\\((.*)\\)|script)",Pattern.CASE_INSENSITIVE);     
        Matcher matcher=pattern.matcher(src);     
        src = matcher.replaceAll("");  
  
        pattern=Pattern.compile("[\\\"\\'][\\s]*javascript:(.*)[\\\"\\']",Pattern.CASE_INSENSITIVE);   
        matcher=pattern.matcher(src);  
        src = matcher.replaceAll("\"\"");  
          
        //增加脚本   
        src = src.replaceAll("script", "").replaceAll(";", "")  
            .replaceAll("\"", "").replaceAll("@", "")  
            .replaceAll("0x0d", "")  
            .replaceAll("0x0a", "").replaceAll(",", "");  
  
        if(!temp.equals(src)){  
            System.out.println("输入信息存在xss攻击！");  
            System.out.println("原始输入信息-->"+temp);  
            System.out.println("处理后信息-->"+src);  
        }  
        return src;  
    }  
      
    //需要增加通配，过滤大小写组合  
    public String cleanSQLInject(String src) {  
        String temp =src;  
        src = src.replaceAll("insert", "forbidI")  
            .replaceAll("select", "forbidS")  
            .replaceAll("update", "forbidU")  
            .replaceAll("delete", "forbidD")  
            .replaceAll("and", "forbidA")  
            .replaceAll("or", "forbidO");  
          
        if(!temp.equals(src)){  
            System.out.println("输入信息存在SQL攻击！");  
            System.out.println("原始输入信息-->"+temp);  
            System.out.println("处理后信息-->"+src);  
        }  
        return src;  
    }  

xml配置:

[html] view plaincopy
<filter>  
        <filter-name>XssFilter</filter-name>  
        <filter-class>cn.com.jsoft.xss.XSSFilter</filter-class>  
        <init-param>  
            <param-name>encoding</param-name>  
            <param-value>UTF-8</param-value>  
        </init-param>  
    </filter>  
    <filter-mapping>  
        <filter-name>XssFilter</filter-name>  
        <url-pattern>/*</url-pattern>  
    </filter-mapping>  

以上代码仅仅将特殊的sql字符，特殊script脚本字符处理掉，具体的页面处理还需要后台处理！！

源码下载地址：http://download.csdn.net/detail/xb12369/7145235

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