Beefy Boxes and Bandwidth Generously Provided by pair Networks
XP is just a number
 
PerlMonks  

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
my problem is i've already untainted this data once.
# ...snip... # untaint parameters for( keys %params ) { # !!!TODO!!! check 'ref' line for subtle bugs ( display_message( $messages{error} ) && exit ) unless ref($valid_params{$_}) eq 'Regexp'; if( $params{$_} =~ /$valid_params{$_}/ ) { $params{$_} = $1; } else { display_message( $messages{error} ) && exit; } }
so the data in %params should be untainted, no? but when it's accessed later, via

my $userfile = get_userfile( $config, $params{username} );
$userfile is now tainted, even though $params{username} should be untainted. am i missing something?

Update: modifying the get_userfile() sub like so:

sub get_userfile { my ( $config, $username ) = ( shift, shift ); # add only this line: still tainted # ( $config->{ users } ) = ( $config->{ users } =~ /^(.+)$/ ); # add only this line: untainted # ( $username ) = ( $username =~ /^(.+)$/ ); $config->{ users } . $username; }
so $config and its data are not tainted. why is $params{ username } still tainted?

~Particle ;


In reply to Re: Re: proper untainting and use of ref by particle
in thread proper untainting and use of ref by particle

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others having an uproarious good time at the Monastery: (10)
    As of 2020-12-01 15:30 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?
      How often do you use taint mode?





      Results (11 votes). Check out past polls.

      Notices?