/// ***************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;
}
}
