T-SQL篇如何防止SQL注入的解决方法(2)

来说说我目前的做法，基于上述数据库创建的Web应用，拼接SQL操作已经渗透到站点的每个页面、每个用户控件，所以我采用的方式是请求过滤。

下面是防SQL注入的操作类：

 /// <summary>
  ///SqlInject 的摘要说明
 /// </summary>
 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 = 0;
  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
  //过滤特征字符
private static string StrKeyWord = ConfigurationManager.AppSettings["SqlKeyWord"]; //@"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 static string StrRegex = ConfigurationManager.AppSettings["SqlRegex"];  //@";|/|(|)|[|]|{|}|%|@|*|'|!"; // 原始过滤条件：【-|;|,|/|(|)|[|]|{|}|%|@|*|'|!】
  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)
 75:     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);
   System.Web.HttpContext.Current.Response.Write("<script>alert('请不要尝试未授权之入侵检测！');javascript:history.go(-1);</script>");
  }
  ///<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;
   }
  }

 

转载：http://netsecurity.51cto.com/art/201301/375797_1.htm