Date: Sat, 17 May 2008 01:50:00 +0400 From: Solar Designer <solar@...nwall.com> To: oss-security@...ts.openwall.com Subject: Re: OpenSSH key blacklisting On Fri, May 16, 2008 at 09:36:06PM +0200, Robert Buchholz wrote: > Gentoo is discussing the feature in bug #221759 . Until now, I have > not heard a reaction to the patch from our OpenSSH maintainers, so I > cannot judge on the technical side of the inclusion. Thanks for the "bug" reference. FWIW, the shell script in this comment is vulnerable itself, in more than one way: http://bugs.gentoo.org/show_bug.cgi?id=221759#c9 For example, it lets a user have any other user's or root's authorized_keys removed, by replacing .ssh with a symlink to someone else's .ssh directory. It's just bad practice to access users' files as root (or as another user); this is difficult to do safely. Also, it misses authorized_keys2. > I assume whichever version has the acceptance of the OpenSSH upstream is > what most of us would be willing to go with. Did you discuss either > blacklist format with them already? Yes, very briefly. They don't intend to implement key blacklisting. I suspect that a worm might change this, though. ;-) > Personally, I would like to see the feature ported to our distribution > sooner than later, but neither at the cost of maintaining patchsets for > the rest of existance, nor with high transition cost once upstream > accepts another format. Well, this is difficult to predict correctly. Alexander
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