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Re: Magic quotes? Should I still be cautious? [message #176426 is a reply to message #176421] Fri, 06 January 2012 17:05 Go to previous messageGo to previous message
M. Strobel is currently offline  M. Strobel
Messages: 386
Registered: December 2011
Karma:
Senior Member
Am 06.01.2012 11:07, schrieb Erwin Moller:
> On 1/6/2012 12:28 AM, M. Strobel wrote:
>> Am 05.01.2012 14:08, schrieb Erwin Moller:
>>>

-----------cut on various places

> Hi Strobel,
>
> And why do you prefer $_REQUEST over using the exact superglobal?
> You do know where the information is supposed to come from.
>
Yes I know that exactly. But why care? When I expect data I do

function getIntFromForm($key, $def=null) {
if (isset($_REQUEST[$key])) {
if ($a = sscanf($_REQUEST[$key], '%d')) { // unsigned
$def = $a[0];
} else {
# keine Zahl im Wert $key / no number
}
} else {
# key nicht gefunden / no key
}
return $def;
}

>
>>
>> But then I have to mention my setup with a sort of call
>> dispatcher: the called function is looked up in a list taking
>> into account $_SERVER['REQUEST_METHOD'].
>
> That explanation makes no sense to me without any more context.
> Are you saying you are limiting access to certain function by
> checking the used $_SERVER['REQUEST_METHOD']?
> If so, that won't help at all, since anybody could still use the
> "right" REQUEST_METHOD and manipulate the contents of GPC at the
> same time.

This is correct, it is not a real protection, but part of the
request processing. And the correct request processing takes care
to only read in and verify expected data.

>>
>> All user input must be verified, no matter if it's in $_GET,
>> $_POST, $_COOKIE or $_REQUEST for that matter - they can all be
>> faked!
>
> Of course.
> But how does that relate to using $_REQUEST over the exact
> superglobal?

if (is-a-post-operation AND data-expected)
read post data;
elseif (is-a-get-operation AND data-expected)
read get data;

What for? Just do
if (data-expected) read request data.


> If you think I am wrong about that, please tell me why.
> I had this discussion a few years back too, but the guy turned
> out to be a troll (and silly me took the bait!), so that turned
> out to be a dead end.

Always check data on input :-)

>
> Regards,
> Erwin Moller
>

/Str.

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