void Application_BeginRequest(Object sender, EventArgs e)
{
StartProcessRequest();
}
#region SQL注入式攻击代码分析
/// <summary>
/// 处理用户提交的请求
/// </summary>
private void StartProcessRequest()
{
try
{
string str = string.Empty;
string getkeys = "";
string sqlErrorPage = "../ErrorPage.aspx";//转向的错误提示页面
if (System.Web.HttpContext.Current.Request.QueryString != null)
{
for (int i = 0; i < System.Web.HttpContext.Current.Request.QueryString.Count; i++)
{
getkeys = System.Web.HttpContext.Current.Request.QueryString.Keys[i];
if (!ProcessSqlStr(System.Web.HttpContext.Current.Request.QueryString[getkeys]))
{
System.Web.HttpContext.Current.Response.Redirect(sqlErrorPage );
System.Web.HttpContext.Current.Response.End();
}
}
}
if (System.Web.HttpContext.Current.Request.Form != null)
{
for (int i = 0; i < System.Web.HttpContext.Current.Request.Form.Count; i++)
{
getkeys = System.Web.HttpContext.Current.Request.Form.Keys[i];
if (getkeys == "__VIEWSTATE" || getkeys == "hidStdName") continue;
if (!ProcessSqlStr(System.Web.HttpContext.Current.Request.Form[getkeys]))
{
System.Web.HttpContext.Current.Response.Redirect(sqlErrorPage);
System.Web.HttpContext.Current.Response.End();
}
}
}
}
catch
{
// 错误处理: 处理用户提交信息!
}
}
/// <summary>
/// 分析用户请求是否正常
/// </summary>
/// <param name="Str">传入用户提交数据 </param>
/// <returns>返回是否含有SQL注入式攻击代码 </returns>
private bool ProcessSqlStr(string Str)
{
bool ReturnValue = true;
try
{
if (Str.Trim() != "")
{
string SqlStr = "and |exec |insert |select |delete |update |count | * |chr |mid |master |truncate |char |declare |'|--|drop table|truncate|creat table";
string[] anySqlStr = SqlStr.Split('|');
foreach (string ss in anySqlStr)
{
if (Str.ToLower().IndexOf(ss) >= 0)
{
string strcon = System.Configuration.ConfigurationSettings.AppSettings["adoConstr"].ToString();
System.Data.SqlClient.SqlConnection conn = new System.Data.SqlClient.SqlConnection(strcon);
conn.Open();
System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand("insert into n_errorstd(stdid,type)values('" + ss + "','5')", conn);
cmd.ExecuteNonQuery();
ReturnValue = false;
break;
}
}
}
}
catch
{
ReturnValue = false;
}
return ReturnValue;
}
#endregion