[OpenAFS-devel] More checksumming in rx?

[Jeffrey E Altman]

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On 12/10/2019 5:43 AM, Jeffrey E Altman wrote:
> On 12/10/2019 4:47 AM, Harald Barth wrote:

>> [...] I'd rather have something on the rx level to prevent this
>> happening, so what can be done?
>=20
> Stop using rxkad.   Proper integrity protection is provided by rxgk
> which AuriStorFS sites have deployed for many years now.
>=20
> Jeffrey Altman

To provide a bit more detail on what you can expect with rxkad.

The rx packet header has a security class specific field (aka cksum)
which is used by rxkad to store a checksum of the packet header fields.
 This checksum never protects any of the packet's data payload.

When rxkad operates in "auth" mode, the connection's key is used to
perform an encrypt operation of zero bytes of data.  No data integrity
protection is provided.

When rxkad operates in "crypt" mode, the connection's key is used to
encrypt the entire data payload.  A 32-bit integer data checksum field
is prepended to the encrypted data payload in the packet; but as
observed this field has always been set to zero and is never checked by
the receiver.

In summary, rxkad only ever provides integrity protection for the rx
packet header and never provides integrity protection for the data payloa=
d.

For comparison, rxgk auth mode provides integrity protection by
constructing and verifying an rfc3961 get_mic operation on each packet's
data payload.

  https://tools.ietf.org/html/draft-wilkinson-afs3-rxgk-11#section-8.7.2

and rxgk crypt provides for both integrity protection and data privacy
by use of an rfc3961 encrypt operation.

  https://tools.ietf.org/html/draft-wilkinson-afs3-rxgk-11#section-8.7.3

Jeffrey Altman


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n:Altman;Jeffrey
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adr:;;255 W 94TH ST STE 6B;New York;NY;10025-6985;United States
email;internet:jaltman@auristor.com
title:CEO
tel;work:+1-212-769-9018
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