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Re^2: What's your favourite method of untainting?

by mrborisguy (Hermit)
on Dec 16, 2005 at 18:43 UTC ( #517328=note: print w/replies, xml ) Need Help??

in reply to Re: What's your favourite method of untainting?
in thread What's your favourite method of untainting?

I'll bite.

package Acme::Unicorn::Horn::Blessed; use strict; use warnings; BEGIN { use Exporter (); use vars qw ($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS); $VERSION = 0.01; @ISA = qw (Exporter); @EXPORT = qw (horn); @EXPORT_OK = qw (); %EXPORT_TAGS = (); } =head1 NAME Acme::Unicorn::Horn::Blessed - A blessed horn of a unicorn untaints ev +erything =head1 SYNOPSIS use Acme::Unicorn::Horn::Blessed; $untainted = horn( $tainted ); $untainted = horn( $tainted, blessed => 0 ); =head1 DESCRIPTION I<A blessed horn of a unicorn untaints everything.> This module untaints everything. =head1 USAGE =head2 horn( tainted_variable, [options] ) Untaint a variable. my $untainted = horn( $tainted ); # if we want to make sure no hackers can harm us, use an 'unblessed +horn of a unicorn' my $untainted = horn( $tainted, blessed => 0 ); =cut sub horn { my $variable = shift; my %options = @_ if ( scalar @_ % 2 ); my $foo; if ( exists $options{ blessed } and not $options{ blessed } ) +{ $foo = undef; } else { ($foo) = ($variable =~ /^(.*)$/gs); } return $foo; } =head1 BUGS The obvious problems you will have with considering tainted va +riables as untainted. =head1 AUTHOR Bryan =head1 COPYRIGHT This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. The full text of the license can be found in the LICENSE file included with this module. =head1 SEE ALSO perl(1). =cut 1;

Note: Untested. And no, I'm not uploading this.


Update: It seems my untested code did have a flaw! Thanks ambrus++.

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Re^3: What's your favourite method of untainting?
by ambrus (Abbot) on Dec 18, 2005 at 12:07 UTC

    I think this is wrong:

    ($foo) = ($variable =~ /^(.*)$/g);
    shouldn't you add an s switch to the regexp so that it would match multi-line strings?

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