Re: [paws] need for DB initialization message

["Joel M. Halpern" <[e-mail]>]

The master has to know its location in geographic coordinates (GPS, 
etc.)   As far as I know, we have not assumed that the maps to translate 
that into political domains are known to the master a priori.

There are deployment scenarios (cell towers come to mind) where the 
master can probably be provisioned with the right administrative 
information.  There are other scenarios where that is not obviously 
achievable.

Yours,
Joel

On 8/10/2012 7:33 PM, [e-mail] wrote:
> While I agree that re-direction from an intermediary to the final recipient should not be disallowed, I don't think the use case you are describing is a valid one. The master needs to know its location before engaging into DB discovery. If it doesn't, then it can use some existing mechanism to find it out (eg, RFC5985) prior to the DB discovery process, but that for me is a separate transaction.
>
> The current DB discovery mechanism described in http://www.ietf.org/id/draft-probasco-paws-discovery-01.txt assumes that the master knows its location before performing DB discovery; after which it needs to do a regulatory domain discovery as well. Brian suggested regulatory domain could be a parameter of the DB URI, thus no need for separate regulatory domain discovery. Any other suggestions?
>
> - Gabor
>
> -----Original Message-----
> From: ext Joel M. Halpern [mailto:[e-mail]]
> Sent: Thursday, August 09, 2012 6:25 PM
> To: Bajko Gabor (Nokia-CIC/SiliconValley)
> Cc: [e-mail]
> Subject: Re: [paws] need for DB initialization message
>
> Related suggestion:  Assuming we have a discovery protocol which can return a URI, the protocol semantics should be such that the URI can be the final DB URI, or another intermediary in the process.  Thus, the protocol should not lock in that there can be only 0 or 1 intermediaries in the resolution, but should allow several.  (We already have suggested cases where at least two are needed, one to determine where you are by asking your vendor, and one to determine who you can talk to by asking your local regulator.)
>
> Yours,
> Joel
>
> On 8/9/2012 8:02 PM, [e-mail] wrote:
>> Folks,
>>
>> During the Vancouver F2F discussions we had some good discussions, but
>> no agreement on wether an initialization message, as proposed in
>> draft-das is necessary or not.
>>
>> You may check the minutes to see what was said at the mike:
>> http://www.ietf.org/proceedings/84/minutes/minutes-84-paws
>>
>> People spoke mostly in favor, but there were people who also said that
>> this message is redundant with registration message.
>>
>> Question#1: need for an initialization message
>>
>> Unfortunately we did not have time to discuss the DB discovery aspect,
>> and that may be related to this topic. The only DB discovery document
>> available currently,
>> http://www.ietf.org/id/draft-probasco-paws-discovery-01.txt, proposes,
>> that the master device contacts a pre-provisioned discovery server and
>> provides its location, and in return the discovery server returns the
>> URI of the DB for that regulatory domain. At this point, the master
>> device knows which DB to contact, but it does not necessarily know what
>> regulatory domain that DB belongs to. Thus, it doesn't know what are the
>> operating rules, whether it has to authenticate, or register, etc.
>>
>> Thus, it seems logical to me that the master device first queries the DB
>> to find out the regulatory domain. We even have such a requirement in
>> the requirement draft, requirement:
>>
>> "P.3:   The protocol MUST support determination of
>> regulatory             domain governing its current location."
>>
>> The information about the regulatory domain may be cached, and the
>> master device may not need to place that query every time, but this
>> message exchange may be necessary in certain cases. Any comments to this
>> point?
>>
>> Question#2
>>
>> Then, it is a slightly separate issue, if this message exchange has to
>> take place, then what additional information the DB returns. draft-das
>> proposes that regulatory domain specific information be returned to the
>> master device.
>>
>> Question#3
>>
>> Yet another separate point is that draft-das proposes to use this
>> initialization message also to initiate client authentication (putting
>> shared secret vs cert issue aside for the time being). In cases when the
>> master device does not know the regulatory domain it is in, then it does
>> not know whether authentication is required in that regulatory domain or
>> not; so why would initiate authentication then? Similar comment applies
>> to draft-wei, where it is proposed that after DB discovery the master
>> device authenticates at TLS layer and performs registration; how does it
>> know that it has to authenticate and register, if it doesn't know the
>> regulatory domain?
>>
>> In my opinion (chair hat off), the sequence of events should be sg like
>> this:
>>
>> 1.DB discovery (may be skipped if cached information available)
>>
>> 2.Regulatory domain query (may be skipped if cached information available)
>>
>> 3.Authentication (if required)
>>
>> 4.Registration (if required)
>>
>> 5.Channel availability query (may be combined with registration?)
>>
>> Comments are welcome and expected.
>>
>> -Gabor
>>
>>
>>
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