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Re: [IPsec] diet-esp - How do you know?

Daniel Migault <mglt.ietf@gmail.com> Tue, 24 May 2022 20:47 UTC

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From: Daniel Migault <mglt.ietf@gmail.com>
Date: Tue, 24 May 2022 16:47:32 -0400
Message-ID: <CADZyTknQSiCrBvdsnjQU8OcTCRhCOBeNW0CC10xhK6cHnD+76g@mail.gmail.com>
To: Robert Moskowitz <rgm-sec@htt-consult.com>
Cc: Paul Wouters <paul.wouters=40aiven.io@dmarc.ietf.org>, IPsecME WG <ipsec@ietf.org>
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Subject: Re: [IPsec] diet-esp - How do you know?
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The issue only comes when a gateway wants to support all sizes of SPIs 0 -
1 - 2 - 3 - 4 bytes - which is very unlikely. For a deterministic lookup, I
would suggest using IP addresses and the minimum allowed byted compressed
SPI.
If you use 2 - 3 bytes, the likelihood of collision might still be very low
to support an additional signature check.

Yours,
Daniel

On Tue, May 24, 2022 at 4:30 PM Robert Moskowitz <rgm-sec@htt-consult.com>
wrote:

> That is the 'easy' part.
>
> What does the code do when it receives an ESP packet?  How do it know that
> it is a diet-esp packet and apply the rules?
>
> Next Header just says: ESP.
>
> On 5/24/22 16:23, Daniel Migault wrote:
>
> This is correct. IKEv2 is used both to agree on the use of Diet-ESP as
> well as values to be used for the compression/decompression.
>
> Yours,
> Daniel
>
> On Tue, May 24, 2022 at 11:14 AM Paul Wouters <paul.wouters=
> 40aiven.io@dmarc.ietf.org> wrote:
>
>>
>> On Sun, May 22, 2022 at 9:20 PM Robert Moskowitz <rgm-sec@htt-consult.com>
>> wrote:
>>
>>> I think there is something else I am missing here.
>>>
>>> How does the receiving system 'know' that the packet is a diet-esp
>>> packet?
>>>
>>
>>
>> https://datatracker.ietf.org/doc/html/draft-mglt-ipsecme-ikev2-diet-esp-extension-02
>>
>> It's negotiated with IKEv2.
>>
>> I guess the IKE stack has to signal this to the ESP implementation on
>> what to expect when
>> the policy is installed ?
>>
>> Paul
>>
>> _______________________________________________
>> IPsec mailing list
>> IPsec@ietf.org
>> https://www.ietf.org/mailman/listinfo/ipsec
>>
>
>
> --
> Daniel Migault
> Ericsson
>
> _______________________________________________
> IPsec mailing listIPsec@ietf.orghttps://www.ietf.org/mailman/listinfo/ipsec
>
>
>

-- 
Daniel Migault
Ericsson

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