I feel like I'm shooting in the dark here, but ...

If the particular computer you are running on is an issue, why not check the BIOS serial number and manufacturer id and have your script run only if it is on the correct machine? If buying time is also concern you could generate fake output and even try to silently send an email to supervisors if it running on the wrong machine complete with the CPU info of the interloper so that follow-up actions or even prosecution would be easier. No point in letting the attacker know his/her attack even failed.

Also do you have in place some sort of digital signing? Can you prevent scripts running if their checksum or digital signature changes? If someone can copy your scripts, might they also not be able to edit them to remove any security checks and delaying tactics you try to insert? If that is the case your EUID check solution (or for that matter a CPU check) isn't a solution at all. If you encapsulate your checks in function calls, Perl makes it dirt easy to redefine a function call. If you hard code your checks in several places in your script, you will be dealing with a maintenance problem. Furthermore, assuming your envisioned attacker is more than your average script kiddie, I'd suspect that he or she would be quite adept at using sed, vi, emacs/emacs, perl or any number of tools to do regex based global search and replace.

In reply to Re^5: Authentication with /etc/shadow by ELISHEVA
in thread Authentication with /etc/shadow by fluffyvoidwarrior

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.