[OpenAFS] Code to demo NFS/UDP weakness?

Anne.Salemme@Dartmouth.edu Anne.Salemme@Dartmouth.edu
Wed, 2 Aug 2006 09:15:05 -0400

an even more compelling argument for AFS over NFS or other large =20
filesystems is the way you can essentially add unlimited space by =20
simply adding servers. the steep learning curve is bringing in afs and =20
getting it into production initially. after that, it's easy to add =20
space, move volumes around, etc. and the users will Never Notice. =20
every NFS site is used to dealing with disks filling up and having =20
data outages while stuff gets moved around. same with SAN space, =20
re-doings luns, all that stuff. i am pretty sure that AFS is the only =20
large filesystems technology that lets the administrators deal with =20
adding new space, moving stuff around, replacing servers, etc. doing =20
normal admin tasks without any interruption of service to the users.

another compelling argument might be if you can show how it would =20
interact with your existing infrastructure, regarding authentication, =20
backups, etc.

to me, a real "weakness" of nfs is how poorly it scales up compared =20
with afs and how many normal administrative operations involve outages =20
for the users.

just my $0.02


Quoting Daniel Clark <dclark@pobox.com>:

> I'm putting together a "NFSv3 is disgustingly insecure, we should move
> to OpenAFS" type presentation for my management [1]. I've found
> explanations to be less than completely understood, so I've decided to
> put together a demo.
> I've already found nfsshell [2], a commonly available user-level
> program that among other things allows creation of NFS requests as any
> other user on a system.
> The most useful article I found on the subject [3] also mentions that
> "UDP is also trivial to spoof, making it easy to get around the
> host-based access control, which relies on the IP address of the
> client." Does anyone know of code that would demo this vulnerability?
> [1] NFSv4 isn't an option due to platform support requirements.
> [2] Leendert van Doorn's nfsshell
> ftp://ftp.cs.vu.nl/pub/leendert/nfsshell.tar.gz
> [3] ;LOGIN: February 2005 pg. 17 - Rik Farrow's Musings
> http://www.usenix.org/publications/login/2005-02/pdfs/musings.pdf
> Thanks,
> --
> Daniel Clark
> dclark@pobox.com
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