Re: [Emu] TEAP time again: Result and Intermediate and crypto binding TLVs with no inner EAP methods
Eliot Lear <lear@lear.ch> Wed, 05 October 2022 16:44 UTC
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Subject: Re: [Emu] TEAP time again: Result and Intermediate and crypto binding TLVs with no inner EAP methods
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There seems to have been a bad edit on my previous message on the 2nd
flow. See below.
On 05.10.22 18:42, Eliot Lear wrote:
>
> Hi everyone,
>
> Picking up on some TEAP work again.
>
> &TL;DR need clarity on how crypto-binding TLVs when there is no inner
> EAP method. Also note the use of request-action.
>
> Key questions: what value to pass for EMSK and MSK in crypto binding
> response when there is no inner method? Zeros?
>
> Also, can the flags indicate that there is no EMSK or MSK? This would
> solve our first problem.
>
> Finally, are we cool piggybacking Result and Crypto-binding on a
> PKCS#7 TLV?
>
> Flows follow:
>
> Use case 1:
>
> Device just wants to use TEAP in the same way one would use EAP-TLS.
> This would be what I would call "normal operations". That is, we would
> expect something along the following lines:
>
> ,----. ,------.
> |Peer| |Server|
> `-+--' `--+---'
> | 1 EAP-Request/ |
> | Identity |
> | <---------------------
> | |
> | 2 EAP-Response/ |
> | Type=Identity |
> | --------------------->
> | |
> ,----------------------------!.
> |Section 3.2 |_\
> `------------------------------'
> | 3 EAP-Request/ |
> | Type=TEAP, |
> | TEAP Start, |
> | Authority-ID TLV |
> | <---------------------
> | |
> | 4 EAP-Response/ |
> | Type=TEAP, |
> | TLS(ClientHello) |
> | --------------------->
> | |
> | 5 EAP-Request/ |
> | Type=TEAP, |
> | TLS(ServerHello, |
> | ServerKeyExchange, |
> | ServerHelloDone) |
> | <---------------------
> | |
> | 6 EAP-Response/ |
> | Type=TEAP, |
> | ClientKeyExchange, |
> | CertificateVerify, |
> | ChangeCipherSpec, |
> | Finished) |
> | --------------------->
> | |
> ,----------------------------!.
> |Section 3.3.3 |_\
> `------------------------------'
> | 7 EAP-Request/ |
> | Type=TEAP, |
> | TLS(ChangeCipherSpec,|
> | Finished), |
> | Result TLV, |
> | Crypto-Binding TLV |
> | <---------------------
> | |
> | 8 EAP-Response/ |
> | Type=TEAP, |
> | Result TLV, |
> | Crypto-Binding TLV |
> | --------------------->
> | |
> | 9 EAP-Success |
> | <---------------------
> ,-+--. ,--+---.
> |Peer| |Server|
> `----' `------'
>
> Note the lack of an Intermediate Result TLV, because the text states
> that Intermediate Results are only required upon completion of an
> inner EAP method.
>
> The second use case involves the use of PKCS#10/PKCS#7 messages. We
> think that looks like this:
>
>
> ,----. ,------. ,--.
> |Peer| |Server| |CA|
> `-+--' `--+---' `+-'
> | EAP-Request/ | |
> | Identity | |
> | <-------------------------------------------------- |
> | | |
> | EAP-Response/ | |
> | Type=Identity | |
> | --------------------------------------------------> |
> | | |
> | EAP-Request/ | |
> | Type=TEAP, | |
> | TEAP Start, | |
> | Authority-ID TLV | |
> | <-------------------------------------------------- |
> | | |
> | EAP-Response/ | |
> | Type=TEAP, | |
> | TLS(ClientHello) | |
> | --------------------------------------------------> |
> | | |
> | EAP-Request/ | |
> | Type=TEAP, | |
> | TLS(ServerHello, | |
> | ServerKeyExchange, | |
> | ServerHelloDone) | |
> | <-------------------------------------------------- |
> | | |
> | EAP-Response/ | |
> | Type=TEAP, | |
> | ClientKeyExchange, | |
> | CertificateVerify, | |
> | ChangeCipherSpec, | |
> | Finished) | |
> | --------------------------------------------------> |
> | | |
> ,---------------------------------------------------------!. |
> |Section 4.2.9 |_\ |
> `-----------------------------------------------------------' |
> | EAP-Request/ | |
> | Type=TEAP, | |
> | TLS(ChangeCipherSpec, | |
> | Finished), | |
> | Request Action TLV(Status=Failure | |
> | ,Action=Process-TLV,TLV=PKCS#10) | |
> | <-------------------------------------------------- |
> | | |
> | EAP-Response/ | |
> | Type=TEAP | |
> | {PKCS#10 TLV} | |
> | --------------------------------------------------> |
> | | |
> ,---------------------------------------------------------!. |
> |Section 4.2.17 |_\ |
> `-----------------------------------------------------------' |
> | | PKCS#10 |
> | | -------------->
> | | |
> | | PKCS#7 |
> | | <--------------
> | | |
> ,---------------------------------------------------------!. |
> |Section 4.2.16 |_\ |
> |Section 3.3.3 | |
> `-----------------------------------------------------------' |
> | EAP-Request/ | |
> | Type=TEAP, | |
> | {PKCS#7 TLV,Crypto-Binding TLV,Result TLV=Success}| |
> | <-------------------------------------------------- |
> | | |
> | Eap-Response/ | |
> | Type=TEAP | |
> | {Crypto-Binding TLV, | |
> | Result TLV=Success} | |
> | --------------------------------------------------> |
> | | |
> | EAP-Success | |
> | <-------------------------------------------------- |
> ,-+--. ,--+---. ,+-.
> |Peer| |Server| |CA|
> `----' `------' `--'
>
>
> Eliot
>
>
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