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Re: [Emu] New Version Notification for draft-janfred-eap-fido-02.txt

Michael Richardson <mcr+ietf@sandelman.ca> Tue, 05 March 2024 19:14 UTC

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From: Michael Richardson <mcr+ietf@sandelman.ca>
To: Heikki Vatiainen <hvn@radiatorsoftware.com>
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Date: Tue, 05 Mar 2024 14:14:46 -0500
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Subject: Re: [Emu] New Version Notification for draft-janfred-eap-fido-02.txt
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Heikki Vatiainen <hvn@radiatorsoftware.com> wrote:
    > I haven't worked with CBOR, but I'd be interested to know if, for
    > example, how careful we need to be with serialiser/deserialiser to
    > avoid problems similar to exponential expansions attacks [1], etc. TLVs

There are no entities like in XML, so that won't work.
CBOR now includes a "packed" format which is essentially a bespoke
compression system for CBOR, with the decompressor defined.
Encoders (compressors) can be as complicated as one likes.

The billion_laughts attack might be possible with packed CBOR, but as a CBOR
Protocol user, you would be justified if you just said, "no packed CBOR"


--
Michael Richardson <mcr+IETF@sandelman.ca>   . o O ( IPv6 IøT consulting )
           Sandelman Software Works Inc, Ottawa and Worldwide

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