[AFS3-std] rxgk-afs: moving SetCallBackKey to a separate document?

Jeffrey Altman jaltman@your-file-system.com
Fri, 01 Mar 2013 16:05:13 -0500


This is a cryptographically signed message in MIME format.

--------------ms070900030009030101030004
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

On 3/1/2013 2:59 PM, Michael Meffie wrote:

> My impression is SetCallBackKey and the related topics could be part of=
 a
> Extended Callback document, because of the security considerations of e=
xtended
> callbacks. If I understand, there is a not a case for securing callback=

> channels with the current callback RPCs since no information is leaked =
with the
> current callback RPCs.

Mike,

Unprotected callback channels do leak which VolumeIDs and FileIDs are in
use by the cache manager and which of those may have been updated.

Unprotected callback channels also permit Denial of Service attacks
against the cache manager because any IP address can send the cache
manager RPCs that invalidate the contents of the cache.

What unprotected callback channels cannot do is poison the cache
contents until such time as extended callbacks is implemented.

Extended callbacks cannot be fully implemented until there are protected
callback channels.  That does not mean there are not benefits to
protecting the callback channels in a world without extended callbacks.

Jeffrey Altman



--------------ms070900030009030101030004
Content-Type: application/pkcs7-signature; name="smime.p7s"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="smime.p7s"
Content-Description: S/MIME Cryptographic Signature
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=
--------------ms070900030009030101030004--