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Re: Sanitizing user input [message #169862 is a reply to message #169855] Tue, 28 September 2010 22:34 Go to previous messageGo to previous message
Jerry Stuckle is currently offline  Jerry Stuckle
Messages: 2598
Registered: September 2010
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On 9/28/2010 12:37 PM, Web Dreamer wrote:
> Jerry Stuckle a écrit ce mardi 28 septembre 2010 17:14 dans
> <i7t1fn$ckq$1(at)news(dot)eternal-september(dot)org> :
>
>>> Concerning the hosting company, you get the point.
>>> But sometimes we are asked do "develop" a web app to resell to another
>>> company, which uses an already-in-production server and for which they
>>> can't change the server settings without breaking an
>>> already-in-production-other- application on the same server.
>>
>> And this code will then break when the host moves to PHP6 and functions
>> are removed.
>
> Yes, but as I mentioned, you are developing for something "already" hosted.
> you do not have the choice, it is imposed by your customer/employer.
> You are right, but I mention a precise case in which if you do not do it,
> there it breaks.
> What do you do in such condition?
>
>> Any host still running with magic_quotes enabled should be avoided at
>> all costs.
>
> I mentioned that you do not have the choice (imposed by employer/customer)
>
>> If applications are dependent on it, they should be
>> rewritten now - before PHP6 comes out and you are forced to rewrite them
>> to get your site back up.
>
> If you include a file which does this, you only need to rewrite two/three
> lines in the corresponding file for the whole web site, not a big issue.
>
>>> By doing so, you ensure that your code is portable.
>>> The following ought also to always be included (with an include_once()
>>> directive):
>>> <?php
>>> ini_set('magic_quotes_runtime', 0);
>>> ini_set('magic_quotes_sybase', 0);
>>> ?>
>>>
>>> since 'magic_quotes_gpc' can't be changed at runtime, the previous I
>>> posted is still required.
>>>
>> Which will really screw things up, since some magic_quotes will be
>> enabled and others disabled.
>
> Nope, believe it, it "fixes" rather than screwing. It makes that you can
> work as if you had no more magic quotes at all.
>
>>> But I agree that for our own personnel server, It's indeed better to
>>> chose a proper hosting company. and that all the previous I have
>>> mentioned would be useless (and will be deprecated in PHP6)
>>>
>>
>> And all new code should be written with this in mind.
>
> It is important to keep in mind that a platform change (PHP 5 to PHP6) can
> be done by changing on, two or three lines in a unique file as I mentioned.
> By doing so, your code is compatible with an awfull server and ready to work
> on something proper.
>
>>> Oh, most important, if you are asked to develop on a server having other
>>> PHP apps, and that you use sessions, it is IMPORTANT tu use:
>>>
>>> ini_set('session.name', "SomethingElseThan_PHPSESSID");
>>
>> Definitely NOT! This can really screw up other apps. For instance, the
>> site stores the login id in the session, with the default cookie
>> PHPSESSID. Now your page gets control and changes that session name.
>> It could easily screw up anything else which tries to get to the login id.
>
> That's where you didn't understand what I mentioned. I was NOT talking about
> writing another page for a site!
> I was talking about writing a complete different application hosted on a
> same server. If you do not do what I do, then your app definitely screws the
> other one, believe me this is granted for sure!
> If you do as I do, the other app which does not invoke
> ini_set('session.name', 'SomethingElseThan_PHPSESSID');
> Will have session.name set to PHPSESSID and you screw nothing.
>
> I well mentioned "seperate apps" (on the same server) which have "no
> relation" and "should not interfere". It can be two vhosts i.e.
>
> In the case you mention, you are absolutely right, but I precised it was not
> this case of figure.
>
>> Much better is to coordinate the data - but that's only normal; when
>> working with an existing site, you need to have an understanding of what
>> the current code uses before going and adding new code. Otherwise you
>> can run into the exact problem you describe.
>
> You are right, but in my example I precisely mentioned that it is to do
> "another site" with "absolutely no relation to the current one" but "on the
> same server" and that they "should not interfere at all". I'm talking about
> the exact opposite! in the case you mention you are indeed absolutely right.
>

And how often does a company want something on their website which is
completely separate from the rest of the site? I've never seen that -
they all want it integrated into the rest of their site.

And if it's a different site, there is no clash with the session id, anyway.

--
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstucklex(at)attglobal(dot)net
==================

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