oss-sec mailing list archives
Re: OpenSSH key blacklisting
From: Vincent Danen <vdanen () linsec ca>
Date: Fri, 16 May 2008 11:53:25 -0600
* [2008-05-16 21:18:54 +0400] Solar Designer wrote:
Are any other distros, besides Debian, Ubuntu, and derived ones, going to implement key blacklisting in OpenSSH - or are considering it? We are considering it for Openwall GNU/*/Linux, and if our effort would be reused by others, or if others join us in developing and/or testing the patch, this would be a reason for us to go for it. I don't think we'll take the Debian/Ubuntu patch as-is. Rather, we are likely to use a trivial binary encoding/compression method for the partial fingerprints. We'd also use smaller partial fingerprints. With the approach I have in mind, it'd take around 4.55 bytes per key to store 48-bit partial fingerprints, bringing the installed file size for 3 arch types and 2 key types/sizes in under 1 MB (or just over 1 MB for 3 key types/sizes).
We (Mandriva) have kinda sat back to see what other vendors are going to do. A few people have asked us to incorporate the Ubuntu patch, but the stance I've taken so far is that if upstream openssh is going to do it, then we will too. Otherwise I don't think we will, unless a number of other vendors are going to do so. We did send an announcement with more info to our security-announce mailing list to give our users a head's up, but didn't think we needed to push this on our users since very few will likely be affected. -- Vincent Danen @ http://linsec.ca/
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Current thread:
- OpenSSH key blacklisting Solar Designer (May 16)
- Re: OpenSSH key blacklisting Craig Edwards (Brain) (May 16)
- Re: OpenSSH key blacklisting Solar Designer (May 16)
- Re: OpenSSH key blacklisting Vincent Danen (May 16)
- Re: OpenSSH key blacklisting Robert Buchholz (May 16)
- Re: OpenSSH key blacklisting Solar Designer (May 16)
- Re: OpenSSH key blacklisting Robert Buchholz (May 17)
- Re: OpenSSH key blacklisting Solar Designer (May 17)
- Re: OpenSSH key blacklisting Robert Buchholz (May 17)
- Re: OpenSSH key blacklisting Solar Designer (May 17)
- Re: OpenSSH key blacklisting Kees Cook (May 18)
- Re: OpenSSH key blacklisting Solar Designer (May 18)
- Re: OpenSSH key blacklisting Kees Cook (May 19)
- Re: OpenSSH key blacklisting Solar Designer (May 16)
- Re: OpenSSH key blacklisting Kees Cook (May 19)
- Re: OpenSSH key blacklisting Craig Edwards (Brain) (May 16)