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Re: [Mud] what if MUD file is now longer available?

Eliot Lear <lear@cisco.com> Mon, 03 June 2019 08:42 UTC

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From: Eliot Lear <lear@cisco.com>
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Date: Mon, 03 Jun 2019 10:42:05 +0200
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To: Michael Richardson <mcr+ietf@sandelman.ca>
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Subject: Re: [Mud] what if MUD file is now longer available?
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> On 18 May 2019, at 23:25, Michael Richardson <mcr+ietf@sandelman.ca> wrote:
> 
> 
> Eliot Lear <lear@cisco.com> wrote:
>>> Section 13.2 says that the MUD-manager should cease processing at that point.
>>> I guess at that point, the access should therefore be default-deny.
>>> I guess the other question is what would the access be if there were no
>>> MUD URL at all.  We'd all like to be default-deny, but I think that during
>>> a transition period it can't be that.
> 
> 
>> If you ever had a valid MUD file you should keep using it.  This
>> follows the principle of least astonishment.  Otherwise, a temporary
>> outage might cause policy flaps.  An alternative might be to invoke an
>> exception flow that says, “yo! No more MUD file”.
> 
> Yes, I'm asking: what if the MUD-manager never got a valid MUD file.
> It did exist at some point, but then marketing moved it when they redid the
> web site, or the company just went under.

I think this ties to the draft we discussed putting together in Prague.  That is- a search path of sorts.

> 
>> A few things to think about with this use case.  We really don’t have
>> contact information in the MUD file.  While one might think that an
>> oversight, honestly I get a little nervous about sticking email
>> addresses in various places that can be harvested for SPAM.
> 
> The contact info does not have to be an email address.
> 
> It could point to quite a number of other things.
> There are some identities out there like 1id.com, Dun&Bradstreet numbers, RIR
> handles,  URLs, …
> 

True- in YANG terms this would be a CHOICE.  Let’s not go crazy with the # of choices, tho.

Eliot

> ...
> 
> Consider the opposite consideration: without a contact, one has no ability to
> find out who is liable.   That would be a relatively low-bar for an import
> regulation.  Every device gets a verifiable contact, or it does not get past
> customs.  The QR code on the case containing the MUD URL provides that.
> 
> --
> Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
> -= IPv6 IoT consulting =-
> 
> 
>

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