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Wednesday·08·March·2006

Giving root access retroactively //at 18:59 //by abe

from the we-don't-need-no-security-levels dept.

How often did you start to edit a file from your usual Unix user account and then noticed, that you only can save the file as root? I often did.

Sec wrote a little tool named presto which helps in this situation on FreeBSD. Initially only being a proof of concept tool to show that write access to /dev/kmem is as good as root access, the tool now has a useful purpose: Called from any editor or other tool (e.g. via sudo), it gives that tool super user privileges retroactively. So in vi, you just can type :!sudo presto to save the opened file, even if only root can write to it. (Works only with security level 0 or -1.)

Oh, and btw: Don’t use presto with Emacs. Emacs isn’t an editor for one file…. ;-)

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Hackergotchi of Axel Beckert

About...

This is the blog or weblog of Axel Stefan Beckert (aka abe or XTaran) who thought, he would never start blogging... (He also once thought, that there is no reason to switch to this new ugly Netscape thing because Mosaïc works fine. That was about 1996.) Well, times change...

He was born 1975 at Villingen-Schwenningen, made his Abitur at Schwäbisch Hall, studied Computer Science with minor Biology at University of Saarland at Saarbrücken (Germany) and now lives in Zürich (Switzerland), working at the IT Support Group (ISG) of the Departement of Physics at ETH Zurich.

Links to internal pages are orange, links to related pages are blue, links to external resources are green and links to Wikipedia articles, Internet Movie Database (IMDb) entries or similar resources are bordeaux. Times are CET respective CEST (which means GMT +0100 respective +0200).


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