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Re: [core] Denial of service for clients: draft-ietf-core-too-many-reqs-04

Ari Keränen <ari.keranen@ericsson.com> Sun, 21 October 2018 18:13 UTC

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From: Ari Keränen <ari.keranen@ericsson.com>
To: Mohit Sethi M <mohit.m.sethi@ericsson.com>, Carsten Bormann <cabo@tzi.org>
CC: The IESG <iesg@ietf.org>, Core <core@ietf.org>
Thread-Topic: [core] Denial of service for clients: draft-ietf-core-too-many-reqs-04
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Date: Sun, 21 Oct 2018 18:13:47 +0000
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Subject: Re: [core] Denial of service for clients: draft-ietf-core-too-many-reqs-04
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Thank you for the review comments Mohit & Carsten!

I have addressed your comments in the draft version in Github (and plan to submit new version tomorrow):
https://github.com/core-wg/too-many-reqs/pull/4/files

* There’s now reference to MaxAge
* Added a note that you can trust the response code only to extent you trust the underlying security mechanisms


Cheers,
Ari

> On 19 Oct 2018, at 8.57, Carsten Bormann <cabo@tzi.org> wrote:
> 
>> On Oct 19, 2018, at 07:44, Mohit Sethi M <mohit.m.sethi@ericsson.com> wrote:
>> 
>> Perhaps you would want to go further and say that this response code 
>> SHALL/SHOULD be authenticated and integrity protected?
> 
> I think any security considerations section could include a sentence that the receiver of a message should trust it only as far as the authentication/freshness for the message carries.  If the attacker can inject responses at will, the client already has a problem.
> The sentence at the end of section 5 already elucidates the specific form of the problem that this response code adds to that.
> 
> More specifically, if a client sends a request in nosec mode, there is not really that much the server can do to reply with authentication.
> 
> Grüße, Carsten
> 
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