But in the context of taint checking w/ CGI, isn't the main
point just that you should scrub your CGI parameters??
Your web server should not be set-UID to root so the security
problem is that stuff from "the world" needs to be checked.
So isn't a reasonable solution as simple as replacing
the few CGI.pm methods that get data from the client with
versions that require "scrubbing instructions"? I'd
probably make a tiny hack to CGI.pm to prevent it from
being used directly and then make a CGI::Safe where
the param() method is a fatal error but safeparam() requires
an extra argument that is the scrubbing instructions.
I'd support a few formats of scrubbing instructions. You
should make the most common case of requiring the parameter
value to match /^\w[-\w.]*\z/ be very easy.
But if a ref to a regex is provided, then apply the regex
and die if it fails, return $1 if successful. If a code
ref is provided, just run that code.
-
tye
(but my friends call me "Tye")
