Que tan seguras son las variables de sesion?
Código PHP:
if (!isset($_SESSION)) {
session_start();
}
$MM_authorizedUsers = "";
$MM_donotCheckaccess = "true";
// *** Restrict Access To Page: Grant or deny access to this page
function isAuthorized($strUsers, $strGroups, $UserName, $UserGroup) {
// For security, start by assuming the visitor is NOT authorized.
$isValid = False;
// When a visitor has logged into this site, the Session variable MM_Username set equal to their username.
// Therefore, we know that a user is NOT logged in if that Session variable is blank.
if (!empty($UserName)) {
// Besides being logged in, you may restrict access to only certain users based on an ID established when they login.
// Parse the strings into arrays.
$arrUsers = Explode(",", $strUsers);
$arrGroups = Explode(",", $strGroups);
if (in_array($UserName, $arrUsers)) {
$isValid = true;
}
// Or, you may restrict access to only certain users based on their username.
if (in_array($UserGroup, $arrGroups)) {
$isValid = true;
}
if (($strUsers == "") && true) {
$isValid = true;
}
}
return $isValid;
}
$MM_restrictGoTo = "login.php";
if (!((isset($_SESSION['MM_Username'])) && (isAuthorized("",$MM_authorizedUsers, $_SESSION['MM_Username'], $_SESSION['MM_UserGroup'])))) {
$MM_qsChar = "?";
$MM_referrer = $_SERVER['PHP_SELF'];
if (strpos($MM_restrictGoTo, "?")) $MM_qsChar = "&";
if (isset($QUERY_STRING) && strlen($QUERY_STRING) > 0)
$MM_referrer .= "?" . $QUERY_STRING;
$MM_restrictGoTo = $MM_restrictGoTo. $MM_qsChar . "accesscheck=" . urlencode($MM_referrer);
header("Location: ". $MM_restrictGoTo);
exit;
}
$ID=GetSQLValueString($_SESSION['ID'], "int");
$colname_persona = "-1";
if (isset($_SESSION['ID'])) {
$colname_persona = GetSQLValueString($_SESSION['ID'], "int");
}
mysql_select_db($database_area, $conexion);
$query_persona = sprintf("SELECT User_name FROM usuarios WHERE User_ID = %s ", $colname_persona);
$persona = mysql_query($query_persona, $conexion) or die(mysql_error());
$row_persona = mysql_fetch_assoc($persona);
$totalRows_persona = mysql_num_rows($persona);
mirando este codigo que va en todas las paginas restringidas...
es posible que un usuario ponga la variable de sesion ID el Id que quiera y se loguee como cualquier usuario? o solo puede modificar el $_SESSION['ID'] en la pagina de login...?