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Re: [stir] Definition of STIR

Christer Holmberg <christer.holmberg@ericsson.com> Wed, 11 May 2022 20:20 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: "Gorman, Pierce" <Pierce.Gorman@t-mobile.com>, Richard Shockey <richard@shockey.us>, "stir@ietf.org" <stir@ietf.org>
Thread-Topic: [stir] Definition of STIR
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Date: Wed, 11 May 2022 20:20:38 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/stir/m_ZNEH15dHDhKkZ6NR-safV4LTQ>
Subject: Re: [stir] Definition of STIR
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Hi,

>Does it need to be in an RFC?  Maybe update the WG charter instead?

I don't think we normally define terminology in the charter. Also, as the WG/charter may not "last forever", I don't know if we can reference it.

>I'm not against it being in an RFC, but don't know if there is a need.

The word "STIR" is used in many RFCs, but there is no (AFAIK) definition or reference anywhere.

draft-ietf-stir-identity-header-errors-handling references RFC 8224 for the new "STIR" Reason header protocol value.

Regards,

Christer



From: Christer Holmberg <christer.holmberg@ericsson.com<mailto:christer.holmberg@ericsson.com>>
Sent: Wednesday, May 11, 2022 2:23 PM
To: Richard Shockey <richard@shockey.us<mailto:richard@shockey.us>>; Gorman, Pierce <Pierce.Gorman@t-mobile.com<mailto:Pierce.Gorman@t-mobile.com>>; stir@ietf.org<mailto:stir@ietf.org>
Subject: RE: [stir] Definition of STIR

Hi,

>Pierce that about covers it...

But that is not documented in any RFC, is it?

Regards,

Christer




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Richard Shockey
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From: stir <stir-bounces@ietf.org<mailto:stir-bounces@ietf.org>> on behalf of "Gorman, Pierce" <Pierce.Gorman@t-mobile.com<mailto:Pierce.Gorman@t-mobile.com>>
Date: Wednesday, May 11, 2022 at 2:04 PM
To: Christer Holmberg <christer.holmberg=40ericsson.com@dmarc.ietf.org<mailto:christer.holmberg=40ericsson.com@dmarc.ietf.org>>, "stir@ietf.org<mailto:stir@ietf.org>" <stir@ietf.org<mailto:stir@ietf.org>>
Subject: Re: [stir] Definition of STIR

I suppose you or others could volunteer attempts at a definition.  Once satisfactorily achieved, what would you do with it?  Not trying to be a smart alec.  I'm seriously curious.

I will volunteer that I think of "STIR" as being the collection of work in the IETF that is referenced in "SHAKEN" call authentication specifications in use in the US and Canada (so far).

"STIR" is the collection of work that tells you how to create a SIP Identity header of whatever type you need for a particular call type, and how to create an X.509 security certificate (chain) with extensions and constraints needed to verify the contents of a SIP Identity header.

"SHAKEN" (a body of work in the ATIS/SIP Forum Joint Task Force on IP-NNI) tells you how to create and use various SIP Identity types defined in "STIR" and about the governance, policy, and certificate authorization framework used to acquire SHAKEN-specific X.509 end-entity certificates.

Beyond this, the call authentication governance authorities in the US and Canada have created requirements and selected entities to be Policy Administrators (PAs) and also created Certificate Policies which outline the requirements to be an authorized (within their respective jurisdictions) Certification Authority (CA), thus creating the SHAKEN GA/PA/CA Secure Telephone Identity (STI) Public Key Infrastructures (PKIs).

I expect others can volunteer alternative, and potentially better, definitions.

Best regards,


Pierce Gorman
From: stir <stir-bounces@ietf.org<mailto:stir-bounces@ietf.org>> On Behalf Of Christer Holmberg
Sent: Wednesday, May 11, 2022 11:52 AM
To: stir@ietf.org<mailto:stir@ietf.org>
Subject: [stir] Definition of STIR

[External]


Hi,



What exactly is "STIR", other than the name of an IETF WG?



Sometimes "STIR" used in document titles, sometimes there is text saying "STIR"/"the STIR mechanism" does this and that, provides this and that etc. draft-ietf-stir-identity-header-errors-handling talks about "extending STIR".



RFC 7340 is supposed to describe the STIR problem, but 7340 does not even say what STIR stands for (Secure Telephone Identity Revisited), and there is no RFC named "STIR".



The question came up while I was reviewing the messaging draft, which says:



"Secure Telephone Identity Revisited (STIR) provides a means of attesting the identity of a telephone caller..."



Regards,



Christer

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