Server Security and the CheckAuthentication() function

Speaking of security it does not seem to make any difference whether I set my folder permissions to 777 or 755, I am still able to use ckfinder to add, edit and delete files on the remote server?

Also how do you test to see if the server is secure or not please?

I can post snippets of code from my "log on" and "restrict access" behaviours if this will help?

//session_start();

session_start();

function CheckAuthentication()
{    
   //WARNING : DO NOT simply return "true". By doing so, you are allowing
   //"anyone" to upload and list the files in your server. You must implement
   //some kind of session validation here. Even something very simple as...

   // return isset($_SESSION['IsAuthorized']) && $_SESSION['IsAuthorized'];

   //... where $_SESSION['IsAuthorized'] is set to "true" as soon as the
   //user logs in your system.
   
   return !empty($_SESSION['MM_Username']);
}

$config['RoleSessionVar'] = 'CKFinder_UserRole';

$config['RoleSessionVar'] = 'MM_Username';

<%
' *** Validate request to log in to this site.
MM_LoginAction = Request.ServerVariables("URL")
If Request.QueryString <> "" Then MM_LoginAction = MM_LoginAction + "?" + Server.HTMLEncode(Request.QueryString)
MM_valUsername = CStr(Request.Form("username"))
If MM_valUsername <> "" Then
  Dim MM_fldUserAuthorization
  Dim MM_redirectLoginSuccess
  Dim MM_redirectLoginFailed
  Dim MM_loginSQL
  Dim MM_rsUser
  Dim MM_rsUser_cmd
  
  MM_fldUserAuthorization = ""
  MM_redirectLoginSuccess = "admin_home.asp"
  MM_redirectLoginFailed = "admin_login_again.asp"

  MM_loginSQL = "SELECT admin_user, admin_pass"
  If MM_fldUserAuthorization <> "" Then MM_loginSQL = MM_loginSQL & "," & MM_fldUserAuthorization
  MM_loginSQL = MM_loginSQL & " FROM dbo.site_admin WHERE admin_user = ? AND admin_pass = ?"
  Set MM_rsUser_cmd = Server.CreateObject ("ADODB.Command")
  MM_rsUser_cmd.ActiveConnection = MM_cnPovertyMain_STRING
  MM_rsUser_cmd.CommandText = MM_loginSQL
  MM_rsUser_cmd.Parameters.Append MM_rsUser_cmd.CreateParameter("param1", 200, 1, 50, MM_valUsername) ' adVarChar
  MM_rsUser_cmd.Parameters.Append MM_rsUser_cmd.CreateParameter("param2", 200, 1, 50, Request.Form("password")) ' adVarChar
  MM_rsUser_cmd.Prepared = true
  Set MM_rsUser = MM_rsUser_cmd.Execute

  If Not MM_rsUser.EOF Or Not MM_rsUser.BOF Then 
    ' username and password match - this is a valid user
    Session("MM_Username") = MM_valUsername
    If (MM_fldUserAuthorization <> "") Then
      Session("MM_UserAuthorization") = CStr(MM_rsUser.Fields.Item(MM_fldUserAuthorization).Value)
    Else
      Session("MM_UserAuthorization") = ""
    End If
    if CStr(Request.QueryString("accessdenied")) <> "" And false Then
      MM_redirectLoginSuccess = Request.QueryString("accessdenied")
    End If
    MM_rsUser.Close
    Response.Redirect(MM_redirectLoginSuccess)
  End If
  MM_rsUser.Close
  Response.Redirect(MM_redirectLoginFailed)
End If
%>

function CheckAuthentication()
   CheckAuthentication = not(IsEmpty( session("MM_Username") ) )
End function

function CheckAuthentication()
{   
   //WARNING : DO NOT simply return "true". By doing so, you are allowing
   //"anyone" to upload and list the files in your server. You must implement
   //some kind of session validation here. Even something very simple as...

   // return isset($_SESSION['IsAuthorized']) && $_SESSION['IsAuthorized'];

   //... where $_SESSION['IsAuthorized'] is set to "true" as soon as the
   //user logs in your system.
   
   return true;
}

Fatal error: Cannot redeclare CheckAuthentication() (previously declared in /mywebsite/ckfinder/config.php:34) in /mywebsite/ckfinder/config.php on line 35

Fatal error: Cannot redeclare CheckAuthentication() (