Re: [secdir] Secdir review of draft-ietf-ecrit-data-only-ea-18

Allison Mankin <> Sat, 24 August 2019 21:18 UTC

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From: Allison Mankin <>
Date: Sat, 24 Aug 2019 17:18:03 -0400
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To: Charlie Kaufman <>
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Subject: Re: [secdir] Secdir review of draft-ietf-ecrit-data-only-ea-18
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Thank you, Charlie. Authors, these are good suggestions!

On Sat, Aug 24, 2019 at 15:53 Charlie Kaufman <>

> I have reviewed this document as part of the security directorate's
> ongoing effort to review all IETF documents being processed by the IESG.
> These comments were written primarily for the benefit of the security area
> directors.  Document editors and WG chairs should treat these comments just
> like any other last call comments.
> This document defines a new MIME type:
> 'application/EmergencyCallData.cap+xml' for use primarily by sensors to
> send alert messages to emergency services providers. It also defines a new
> Emergency Call Data Type: 'cap' in order to embed this data efficiently in
> a SIP transaction. I saw no new security issues beyond those already noted
> for the protocols carrying these messages.
> I do have some editorial suggestions:
> There is a lot of context that the authors assumed any reader would have
> that could have been stated in the introduction. I believe from context
> that the purpose of this new MIME type is to support simple (IoT) sensors
> that don't want to implement a more heavyweight protocol, but I don't
> believe that was stated anywhere.
> I got the impression that the functionality provided could have been done
> with existing protocols by sending the CAP message over a SIP session, but
> that doing so would place an unnecessary burden on simple (IoT) sensors,
> and that this protocol would be easier for such sensors to implement for
> the limited cases such sensors need to deal with. If that's true, it should
> be stated. If not, the purpose of this protocol should be more clearly
> stated.
> These acronyms were used but never defined:
> LoST
> These acronyms were expanded, but not in an easy to find place:
> Common Alerting Protocol (CAP)
> Public Safety Answering Points (PSAPs)
> Emergency Services Routing Proxy (ESRP)
> It would be nice to include them in the terminology section, ideally with
> a reference to the RFC where more information is available.
> Typo:
> p17 "security mechanism" -> "security mechanisms"
>  --Charlie