i am working on a script that will run setuid. i know the security lectures, but unfortunately, this one touches /etc/passwd so i am just trying to use taint checks as oft as possible and watch my back with any holes i can foresee.

in the process of the script however, i am writing the users being touched to a flat file. when running the script as setuid, i get an error complaining that opening a file via:

open(FH, "/etc/pop3/users.$domain")
  or die "Cant open file for reading : $!\n";

[download]

is not allowed or doesnt pass checks. sorry, but i cant at the moment recall the error and dont have the ability to duplicate it at the moment.

does this sound familiar? is there a way to safely perform such a task in a setuid file?

humbly -c

In reply to filehandles and setuid by c

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, details, 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, summary, 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.