防止sql注入拦截

太过爱你忘了你带给我的痛 2022-06-01 00:13 225阅读 0赞

# [防止sql注入拦截][sql] #

这两天在做一个sql注入拦截，期间遇到了不少问题，最大的问题是在，拦截sql注入后利用response 重定向到错误页面，始终无法实现跳转。发现原因是，ajax 异步请求时并不会对response重定向做处理。当然包括response.getWrite().print("");等页面都不会做出反应。

下面是我的代码，首先是编写一个拦截器

![复制代码][copycode.gif]

package com.booway.pwbzh.util;
    
    import java.util.Enumeration;
    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;
    import javax.servlet.http.HttpServletResponse;
    
    /**
     * sql注入攻击拦截
     * @author s
     */
    public class SqlInjectFilter implements Filter
    {
        FilterConfig filterConfig = null;
    
        /**
         * 初始化
         * @param filterConfig filterConfig
         * @throws ServletException 异常
         */
        public void init(FilterConfig filterConfig) throws ServletException
        {
            this.filterConfig = filterConfig;
        }
    
        public void destroy()
        {
            this.filterConfig = null;
        }
    
        public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
        {
            HttpServletRequest req = (HttpServletRequest) request;
            HttpServletResponse res = (HttpServletResponse) response;
            try
            {
                // 获得所有请求参数名
                Enumeration params = req.getParameterNames();
                String sql = "";
                while (params.hasMoreElements())
                {
                    // 得到参数名
                    String name = params.nextElement().toString();
                    // 得到参数对应值
                    String[] value = req.getParameterValues(name);
                    for (int i = 0; i < value.length; i++)
                    {
                        sql = sql + value[i];
                    }
                }
                // 截取我要拦截的字段
                sql = getfilte(sql);
                // 有sql关键字，跳转到error.html
                if (sqlValidate(sql))
                {
                    res.setHeader("SESSIONSTATUS", "TIMEOUT");
                    res.setHeader("CONTEXTPATH", req.getContextPath() + "/pwbzh_module/500.jsp");
                    res.setStatus(HttpServletResponse.SC_FORBIDDEN);
                    return;
                    // throw new IOException("您发送请求中的参数中含有非法字符");
    
                }
    
                chain.doFilter(request, response);
            }
            catch (Exception e)
            {
                e.printStackTrace();
            }
    
        }
    
        // 效验
        protected static boolean sqlValidate(String str)
        {
            str = str.toLowerCase();// 统一转为小写
            String badStr = "'|and|exec|execute|insert|select|delete|update|count|drop|*|%|chr|mid|master|truncate|" + "char|declare|sitename|net user|xp_cmdshell|;|or|-|+|,|like'|and|exec|execute|insert|create|drop|" + "table|from|grant|use|group_concat|column_name|" + "information_schema.columns|table_schema|union|where|select|delete|update|order|by|count|*|" + "chr|mid|master|truncate|char|declare|or|;|-|--|+|,|like|//|/|%|#";// 过滤掉的sql关键字，可以手动添加
            String[] badStrs = badStr.split("\\|");
            for (int i = 0; i < badStrs.length; i++)
            {
                // 循环检测，判断在请求参数当中是否包含SQL关键字
                if (str.indexOf(badStrs[i]) >= 0)
                {
                    return true;
                }
            }
            return false;
        }
    
        // 截取需要拦截的字段
        protected static String getfilte(String str)
        {
            int idex = str.indexOf("filter");
            String ss = "";
            if (idex < 0)
            {
                return ss;
            }
            if (str.indexOf(",", idex) < 0)
            {
                ss = str.substring(idex, str.length());
            }
            else
            {
                ss = str.substring(idex, str.indexOf(",", idex));
            }
            return ss;
        }
    }

![复制代码][copycode.gif]

在xml中加入拦截配置

![复制代码][copycode.gif]

<module:servletfilter id="SqlInjectFilter">
    <module:filter-name>SqlInjectFilter</module:filter-name>
    <module:filter-class>
    com.booway.pwbzh.util.SqlInjectFilter
    </module:filter-class>
    <module:url-pattern>*/*</module:url-pattern>
    </module:servletfilter>

![复制代码][copycode.gif]

最关键的，要突破ajax 实现跳转在首页加入下面这个方法

![复制代码][copycode.gif]

$.ajaxSetup( {  
        //设置ajax请求结束后的执行动作  
        complete :   
        function(XMLHttpRequest, textStatus) {  
            // 通过XMLHttpRequest取得响应头，sessionstatus  
            var sessionstatus = XMLHttpRequest.getResponseHeader("sessionstatus");  
            if (sessionstatus == "TIMEOUT") {  
                var win = window;  
                while (win != win.top){  
                    win = win.top;  
                } 
               //alert("请不要尝试sql注入!");
                    win.location.href= XMLHttpRequest.getResponseHeader("CONTEXTPATH");  
            }  
        }  
    });

![复制代码][copycode.gif]

解决方案出自 http://blog.csdn.net/guiyingde/article/details/53381734 感谢[面向阳光的向日葵][Link 1]。

标签:  [sql注入][sql 1],  [ajax][],  [response][],  [重定向][Link 2],  [异步][Link 3],  [拦截][Link 4]

[sql]: http://www.cnblogs.com/fanjun2017/p/7202336.html
[copycode.gif]: /images/20220601/d699adf21d424030a10dd7d9fccc4bad.png
[Link 1]: http://my.csdn.net/GuiYingde
[sql 1]: http://www.cnblogs.com/fanjun2017/tag/sql%E6%B3%A8%E5%85%A5/
[ajax]: http://www.cnblogs.com/fanjun2017/tag/ajax/
[response]: http://www.cnblogs.com/fanjun2017/tag/response/
[Link 2]: http://www.cnblogs.com/fanjun2017/tag/%E9%87%8D%E5%AE%9A%E5%90%91/
[Link 3]: http://www.cnblogs.com/fanjun2017/tag/%E5%BC%82%E6%AD%A5/
[Link 4]: http://www.cnblogs.com/fanjun2017/tag/%E6%8B%A6%E6%88%AA/