Re: [Mip4] Does MIP support RegReq authentication without having to do timekeeping?

Alexandru Petrescu <alexandru.petrescu@gmail.com> Thu, 14 March 2013 19:24 UTC

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Date: Thu, 14 Mar 2013 20:23:48 +0100
From: Alexandru Petrescu <alexandru.petrescu@gmail.com>
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Cc: Ahmad Muhanna <amuhanna@awardsolutions.com>, Mobile IPv4 Mailing List <mip4@ietf.org>
Subject: Re: [Mip4] Does MIP support RegReq authentication without having to do timekeeping?
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Le 14/03/2013 20:20, Kent Leung (kleung) a écrit :
> Hi Alex. The nonce method is specified in the Mobile IP RFCs. But I'm
> not sure if any vendor supports that. If #2 works, that should
> address you issue.

This is something we should implement on the MR side.  Do you think the
HA side already does it (I doubt?)?

Alex

>
> Kent
>
> -----Original Message----- From: mip4-bounces@ietf.org
> [mailto:mip4-bounces@ietf.org] On Behalf Of Alexandru Petrescu Sent:
>  Thursday, March 14, 2013 11:54 AM To: Ahmad Muhanna Cc: Mobile IPv4
>  Mailing List Subject: Re: [Mip4] Does MIP support RegReq
> authentication without having to do timekeeping?
>
> Sounds reasonable to use timestamp as usual and if it fails then try
>  the nonce... but...
>
> Does this behaviour require modification of the HA? (we are not able
>  to modify it, but we can modify the MR).
>
> Le 14/03/2013 19:44, Ahmad Muhanna a écrit :
>> Hi Alex,
>>
>> As far as I recall, RFC2002 and all updates afterwards, allow the
>> use of nonce. Basically like a challenge.
>>
>>> From implementation prospective; I would allow both to coexist
>>> as follows:
>> 1. Both HA and MR uses timestamp as normal and no issue there.
>
> Yes.
>
>> 2. When the MR fails or start NOT to have a valid time, the MR
>> should have remembered the last RRP ID which is based on timestamp
>>  and use that for Re-Registration.
>
> Ok, this could be done.
>
>> 3. At the HA, it should check timestamp first, if it passes then
>> timestamp continues to work; if it fails, the HA should check the
>> Re-Registration ID against the last ID that was sent in the last
>> RRP, if it is the same, the HA should allow the RRP to go through.
>
> This is a modification to the HA implementation, isn't it?
>
> Alex
>
>>
>> I Hope this helps!
>>
>> Cheers!
>>
>> Best Regards, Ahmad
>>
>> -----Original Message----- From: mip4-bounces@ietf.org
>> [mailto:mip4-bounces@ietf.org] On Behalf Of Alexandru Petrescu
>> Sent: Thursday, March 14, 2013 12:21 PM To: Mobile IPv4 Mailing
>> List Subject: [Mip4] Does MIP support RegReq authentication without
>> having to do timekeeping?
>>
>> MIP4 participants,
>>
>> I would like to learn whether Mobile IPv4 spec supports an
>> authentication scheme for RegReq/RegRep which does not rely on
>> timekeeping.
>>
>> Let me explain why.
>>
>> We use a Mobile Router in a moving network that gets connected to
>> the Home Agent.  The Mobile Router's power supply may be turned off
>> (its battery dies out after an extended period of inactivity, like
>> in a vehicle).  At that point the MR looses its time.
>>
>> When it finally wakes up, it has to perform a Registration Req/Rep
>> with the HA, without assuming that its time is correct.  Or, the
>> MIP4 regreq/regrep HA implementation that we use seems to rely on
>> having the right time, otherwise the registration fails.
>>
>> Under these conditions, is it possible to use an auth mechanism
>> which does not rely on timekeeping?
>>
>> Alex
>>
>> -- Mip4 mailing list: Mip4@ietf.org Web interface:
>> https://www.ietf.org/mailman/listinfo/mip4 Charter page:
>> http://www.ietf.org/html.charters/mip4-charter.html Supplemental
>> site: http://www.mip4.org/
>>
>>
>
>
> -- Mip4 mailing list: Mip4@ietf.org Web interface:
> https://www.ietf.org/mailman/listinfo/mip4 Charter page:
> http://www.ietf.org/html.charters/mip4-charter.html Supplemental
> site: http://www.mip4.org/
>
>