T-SQL篇如何防止SQL注入的解决方法

 1: /// <summary>

 2:  ///SqlInject 的摘要说明

 3:  /// </summary>

 4:  public class SqlInject : System.Web.UI.Page

 5:  {

 6:   //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

 7:   private const int _type = 0;

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

 9:  

 10:   //如果记录注入信息，那么请设置errMDBpath数据库路径

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

 12:  

 13:  

 14:   //过滤特征字符

 15:   //过滤特征字符

 16:   private static string StrKeyWord = ConfigurationManager.AppSettings["SqlKeyWord"]; //@"select|insert|delete|from|count(|drop table|update|truncate|asc(|mid(|char(|xp_cmdshell|exec|master| local group administrators| user|or|and";

 17:   private static string StrRegex = ConfigurationManager.AppSettings["SqlRegex"];  //@";|/|(|)|[|]|{|}|%|@||'|!"; // 原始过滤条件【-|;|,|/|(|)|[|]|{|}|%|@||'|!】

 18:  

 19:   private HttpRequest request;

 20:   public SqlInject(System.Web.HttpRequest _request)

 21:   {

 22:    this.request = _request;

 23:   }

 24:   ///<summary>

 25:   ///检测SQL注入及记录、显示出错信息

 26:   ///</summary>

 27:   public void CheckSqlInject()

 28:   {

 29:    bool isInject = false;

 30:    if (CheckRequestQuery() || CheckRequestForm())

 31:    {

 32:     isInject = true;

 33:    }

 34:    else

 35:    {

 36:     return;

 37:    }

 38:  

 39:    switch (_type)

 40:    {

 41:     case 0:

 42:      ShowErr();

 43:      break;

 44:     case 1:

 45:      ShowErr();

 46:      SaveToMdb();

 47:      break;

 48:     case 2:

 49:      ShowErr();

 50:      string temp;

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

 52:      break;

 53:     case 3:

 54:      ShowErr();

 55:      SaveToMdb();

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

 57:      break;

 58:     default:

 59:      break;

 60:    }

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

 62:  

 63:   }

 64:   private void SaveToMdb()

 65:   {

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

 67:    conn.Open();

 68:    OleDbCommand cmd = conn.CreateCommand();

 69:  

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

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

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

 73:    int code = cmd.ExecuteNonQuery();

 74:    if (code == 1)

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

 76:    else

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

 78:    conn.Close();

 79:  

 80:   }

 81:   private string RelaceSingleQuotes(string _url)

 82:   {

 83:    string URL = _url.Replace("'", "单引号");

 84:    return URL;

 85:   }

 86:   private void ShowErr()

 87:   {

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

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

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

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

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

 93:    //System.Web.HttpContext.Current.Response.Clear();

 94:    //System.Web.HttpContext.Current.Response.Write(msg);

 95:    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>");

 96:   }

 97:   ///<summary>

 98:   /// 特征字符

 99:   ///</summary>

 100:   public static string KeyWord

 101:   {

 102:    get

 103:    {

 104:     return StrKeyWord;

 105:    }

 106:   }

 107:   ///<summary>

 108:   /// 特征符号

 109:   ///</summary>

 110:   public static string RegexString

 111:   {

 112:    get

 113:    {

 114:     return StrRegex;

 115:    }

 116:   }

 117:  

 118:   ///<summary>

 119:   ///检查字符串中是否包含Sql注入关键字

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

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

 122:   ///</summary>

 123:   private static bool CheckKeyWord(string _key)

 124:   {

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

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

 127:    foreach (string sqlParam in pattenString)

 128:    {

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

 130:     {

 131:      return true;

 132:     }

 133:    }

 134:    foreach (string sqlParam in pattenRegex)

 135:    {

 136:     if (_key.Contains(sqlParam))

 137:     {

 138:      return true;

 139:     }

 140:    }

 141:    return false;

 142:  

 143:   }

 144:   ///<summary>

 145:   ///检查URL中是否包含Sql注入

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

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

 148:   ///</summary>

 149:   public bool CheckRequestQuery()

 150:   {

 151:    if (request.QueryString.Count > 0)

 152:    {

 153:     foreach (string sqlParam in this.request.QueryString)

 154:     {

 155:      if (sqlParam == "__VIEWSTATE") continue;

 156:      if (sqlParam == "__EVENTVALIDATION") continue;

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

 158:      {

 159:       return true;

 160:      }

 161:     }

 162:    }

 163:    return false;

 164:   }

 165:   ///<summary>

 166:   ///检查提交的表单中是否包含Sql注入

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

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

 169:   ///</summary>

 170:   public bool CheckRequestForm()

 171:   {

 172:    if (request.Form.Count > 0)

 173:    {

 174:     foreach (string sqlParam in this.request.Form)

 175:     {

 176:      if (sqlParam == "__VIEWSTATE") continue;

 177:      if (sqlParam == "__EVENTVALIDATION") continue;

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

 179:      {

 180:       return true;

 181:      }

 182:     }

 183:    }

 184:    return false;

 185:   }

 186:  }