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Re: Sanitizing user input [message #169728 is a reply to message #169724]

Fri, 24 September 2010 08:15

alvaro.NOSPAMTHANX
Messages: 277
Registered: September 2010

Karma:

Senior Member

El 24/09/2010 7:42, MikeB escribió/wrote:
> I'm reading that it is a "good idea" to sanitize all data returned in a
> HTML form.

In general:

- You must sanitize any input you didn't generate yourself.
- You must escape properly everything you insert into a string, even if
you generated it yourself.

> The book recommends using the mysql_real_escape_string()
> function as well as stripslashes() and for some data it also recommends
> using htmlentities().

You should never use stripslashes() unless you have a very old server
that is configured to add slashes to your data:

http://es2.php.net/manual/en/security.magicquotes.php

As about htmlentities(), I don't think it's worth using it. It makes
your HTML grow in size will lots of useless entities (é -> é) but
it cannot really escape all the stuff that needs to be escaped (such as
high-pane Unicode characters). And it's not even aware of the output
charset.

> Question now is that the mysql function is only available if I'm
> connected to a mysql database.
>
> Is the mysql sanitizing only necessary for data fields that are going to
> be used against the database? Or is there a similar function to sanitize
> user data that may not be used as part of the sql data?

The name says it all: it's a function to escape stuff for MySQL when you
are using the MySQL extension. It server no other purpose.

If you use PostgreSQL, you must use the PostgreSQL escaping methods. If
you use PDO you must use the PDO escaping methods.

Furthermore:

- If you are generating HTML you must escape the HTML way, e.g.
htmlspecialchars()
- If you are generating JSON you must escape the JSON way, e.g.
json_encode()
- Etc, etc.

It's nice you care about this. Even most PHP books ignore the subject :)

--
-- http://alvaro.es - Álvaro G. Vicario - Burgos, Spain
-- Mi sitio sobre programación web: http://borrame.com
-- Mi web de humor satinado: http://www.demogracia.com
--

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[Message index]

		Sanitizing user input By: MikeB on Fri, 24 September 2010 05:42
		Re: Sanitizing user input By: Helmut Chang on Fri, 24 September 2010 07:59
		Re: Sanitizing user input By: MikeB on Fri, 24 September 2010 15:24
		Re: Sanitizing user input By: Web Dreamer on Tue, 28 September 2010 10:11
		Re: Sanitizing user input By: Jerry Stuckle on Tue, 28 September 2010 11:21
		Re: Sanitizing user input By: Web Dreamer on Tue, 28 September 2010 13:14
		Re: Sanitizing user input By: Jerry Stuckle on Tue, 28 September 2010 15:14
		Re: Sanitizing user input By: Michael Fesser on Tue, 28 September 2010 16:24
		Re: Sanitizing user input By: Jerry Stuckle on Tue, 28 September 2010 22:35
		Re: Sanitizing user input By: Web Dreamer on Wed, 29 September 2010 08:01
		Re: Sanitizing user input By: Jerry Stuckle on Wed, 29 September 2010 10:57
		Re: Sanitizing user input By: Web Dreamer on Wed, 29 September 2010 13:47
		Re: Sanitizing user input By: Jerry Stuckle on Wed, 29 September 2010 16:21
		Re: Sanitizing user input By: Web Dreamer on Thu, 30 September 2010 07:44
		Re: Sanitizing user input By: Jerry Stuckle on Thu, 30 September 2010 12:32
		Re: Sanitizing user input By: Web Dreamer on Thu, 30 September 2010 12:51
		Re: Sanitizing user input By: Web Dreamer on Tue, 28 September 2010 16:37
		Re: Sanitizing user input By: Jerry Stuckle on Tue, 28 September 2010 22:34
		Re: Sanitizing user input By: Web Dreamer on Wed, 29 September 2010 07:54
		Re: Sanitizing user input By: Web Dreamer on Wed, 29 September 2010 08:02
		Re: Sanitizing user input By: Jerry Stuckle on Wed, 29 September 2010 11:01
		Re: Sanitizing user input By: Web Dreamer on Wed, 29 September 2010 13:15
		Re: Sanitizing user input By: Jerry Stuckle on Wed, 29 September 2010 16:22
		Re: Sanitizing user input By: Web Dreamer on Thu, 30 September 2010 07:47
		Re: Sanitizing user input By: Jerry Stuckle on Thu, 30 September 2010 12:35
		Re: Sanitizing user input By: Web Dreamer on Thu, 30 September 2010 12:57
		Re: Sanitizing user input By: alvaro.NOSPAMTHANX on Fri, 24 September 2010 08:15
		Re: Sanitizing user input By: MikeB on Fri, 24 September 2010 15:06
		Re: Sanitizing user input By: Michael Fesser on Fri, 24 September 2010 17:12

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