SQL防注入程序 v1.0

/// ***************C#版SQL防注入程序 v1.0************

/// *使用方法：

/// 一、整站防注入(推荐)

/// 在Global.asax.cs中查找Application_BeginRequest函数加入代码，如下

///   protected void Application_BeginRequest(Object sender, EventArgs e)

///              {

///             //防SQL注入代码

///             SqlInject myCheck = new SqlInject(this.Request);

///             myCheck.CheckSqlInject();

///              }

/// 二、单独页面防注入

/// 在要保护的页面cs文件的Page_Load函数中加入代码，如下:

///     protected void Page_Load(object sender, EventArgs e)

///     {

///             SqlInject myCheck = new SqlInject(this.Request);

///             myCheck.CheckSqlInject();

///     }

/// 三、基本设置

/// 1.修改private const int _type = 3 的_type参数来设置Sql注入警告及日志记录方式；

/// 2.修改string errRedirectPage = "/err.aspx" 来设置自定义错误处理页面；

/// 3.如果_type=1或者3，那么请务必设置string errMDBpath = "/SqlInject.mdb"相应的日志数据库路径；

/// 4.如果采取默认程序，那么请将本程序对应的SqlInject.mdb放至网站系统根目录下。

///

/// *版权说明:

/// 一、部分代码参考Asp版Sql通用防注入程序3.2 Neeao站点：http://www.neeao.com

/// 二、大部分核心代码参考网上匿名.NET防注入代码，感谢

/// 三、此代码下载和更新站点：www.wbyj.com

/// ***********************************

/// </summary>

using System;

using System.Data;

using System.Configuration;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using System.Data.OleDb;

using System.Text.RegularExpressions;

public class SqlInject : System.Web.UI.Page

{

//检测到注入后的处理方式:   0:仅警告；1：警告+记录；2：警告+自定义错误页面；3：警告+记录+自定义错误页面

private const int _type = 3;

private const string errRedirectPage = "/err.aspx";

//如果记录注入信息，那么请设置：errMDBpath：数据库路径

private const string errMDBpath = "/SqlInject.mdb";

//过滤特征字符

private const string StrKeyWord=@"select|insert|delete|from|count(|drop table|update|truncate|asc(|mid(|char(|xp_cmdshell|exec|master|net local group administrators|net user|or|and";

private const string StrRegex=@"-|;|,|/|(|)|[|]|{|}|%|@|*|'|!";

private HttpRequest request;

public SqlInject(System.Web.HttpRequest _request)

{

this.request=_request;

}

///<summary>

///检测SQL注入及记录、显示出错信息

///</summary>

public void CheckSqlInject()

{

bool isInject = false;

if (CheckRequestQuery() || CheckRequestForm())

{

isInject = true;

}

else

{

return;

}

switch (_type)

{

case 0:

ShowErr();

break;

case 1:

ShowErr();

SaveToMdb();

break;

case 2:

ShowErr();

string temp;

System.Web.HttpContext.Current.Response.Write("<script>setTimeout(\""+"location.href='"+errRedirectPage+"'"+"\",5000)</script>");

break;

case 3:

ShowErr();

SaveToMdb();

System.Web.HttpContext.Current.Response.Write("<script>setTimeout(\"" + "location.href='" + errRedirectPage + "'" + "\",5000)</script>");

break;

default:

break;

}

System.Web.HttpContext.Current.Response.End();

}

private void SaveToMdb()

{

OleDbConnection conn = new OleDbConnection("Provider=Microsoft.JET.OLEDB.4.0;Data Source=" + Server.MapPath(errMDBpath));

conn.Open();

OleDbCommand cmd = conn.CreateCommand();

cmd.CommandText = "insert into [Record] (sIP,sDate,sPath) values ('" +

request.ServerVariables["REMOTE_ADDR"].ToString() + "','" +

DateTime.Now + "','" + request.ServerVariables["URL"].ToLower() + RelaceSingleQuotes(request.QueryString.ToString()) + "')";

int code = cmd.ExecuteNonQuery();

if (code==1)

System.Web.HttpContext.Current.Response.Write("<br>****以上信息已记录至日志数据库****");

else

System.Web.HttpContext.Current.Response.Write("<br>日志数据库出错");

conn.Close();

}

private string RelaceSingleQuotes(string _url)

{

string URL=_url.Replace("'","单引号");

return URL;

}

private void ShowErr()

{

string msg = @"<font color=red>请不要尝试未授权之入侵检测！</font>" + @"<br><br>";

msg += @"操作IP：" + request.ServerVariables["REMOTE_ADDR"] + @"<br>";

msg += @"操作时间：" + DateTime.Now + @"<br>";

msg += @"页面：" + request.ServerVariables["URL"].ToLower() + request.QueryString.ToString() + @"<br>";

msg += @"<a href='#' onclick='javascript:window.close()'>关闭</a>";

System.Web.HttpContext.Current.Response.Clear();

System.Web.HttpContext.Current.Response.Write(msg);

}

///<summary>

/// 特征字符

///</summary>

public static string KeyWord

{

get {

return StrKeyWord;

}

}

///<summary>

/// 特征符号

///</summary>

public static string RegexString

{

get {

return StrRegex;

}

}

///<summary>

///检查字符串中是否包含Sql注入关键字

/// <param name="_key">被检查的字符串</param>

/// <returns>如果包含注入true;否则返回false</returns>

///</summary>

private static bool CheckKeyWord(string _key)

{

string[] pattenString = StrKeyWord.Split('|');

string[] pattenRegex = StrRegex.Split('|');

foreach (string sqlParam in pattenString)

{

if (_key.Contains(sqlParam + " ") || _key.Contains(" " + sqlParam))

{

return true;

}

}

foreach (string sqlParam in pattenRegex)

{

if (_key.Contains(sqlParam))

{

return true;

}

}

return false;

}

///<summary>

///检查URL中是否包含Sql注入

/// <param name="_request">当前HttpRequest对象</param>

/// <returns>如果包含注入true;否则返回false</returns>

///</summary>

public bool CheckRequestQuery()

{

if (request.QueryString.Count > 0)

{

foreach (string sqlParam in this.request.QueryString)

{

if (sqlParam == "__VIEWSTATE") continue;

if (sqlParam == "__EVENTVALIDATION") continue;

if (CheckKeyWord(request.QueryString[sqlParam].ToLower()))

{

return true;

}

}

}

return false;

}

///<summary>

///检查提交的表单中是否包含Sql注入

/// <param name="_request">当前HttpRequest对象</param>

/// <returns>如果包含注入true;否则返回false</returns>

///</summary>

public bool CheckRequestForm()

{

if (request.Form.Count > 0)

{

foreach (string sqlParam in this.request.Form)

{

if (sqlParam == "__VIEWSTATE") continue;

if (sqlParam == "__EVENTVALIDATION") continue;

if (CheckKeyWord(request.Form[sqlParam]))

{

return true;

}

}

}

return false;

}

}