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Re: [Emu] Can we get a WG last call for draft-dekok-emu-eap-session-id-00 ?

Mohit Sethi M <mohit.m.sethi@ericsson.com> Wed, 05 June 2019 07:17 UTC

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From: Mohit Sethi M <mohit.m.sethi@ericsson.com>
To: Alan DeKok <aland@deployingradius.com>, EMU WG <emu@ietf.org>
Thread-Topic: [Emu] Can we get a WG last call for draft-dekok-emu-eap-session-id-00 ?
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Subject: Re: [Emu] Can we get a WG last call for draft-dekok-emu-eap-session-id-00 ?
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Chair hat on:

The draft needs to be formally adopted as a working group item before moving to last call.

Chair hat off:

I support the adoption of this draft as a working group item. This is a charter item and the draft is simple enough to move forward rather quickly. The code has been updated in the wpa_supplicant and hostapd:
https://w1.fi/cgit/hostap/commit/?id=1c16b257a081e810caf2ca0926ff4f9e2bb9557c

https://w1.fi/cgit/hostap/commit/?id=5eefa8115b884f8ab45ac6521f66dc68f555dcd0

John provided a review here: https://mailarchive.ietf.org/arch/msg/emu/fHopSdLqMY37odPGvwn7M5ZksIw

and Jouni made a comment here: https://mailarchive.ietf.org/arch/msg/emu/MX7P367g4j2c3yuyqch3W-I3u_o

I have a couple of comments:

I think it would really help to document the fact that the Session-Id length for EAP-SIM is different for full authentication and fast re-authentication. That's because for full authentication, the Session-Id is:

Session-Id = 0x12 || RAND || NONCE_MT

and RFC 4186 says that EAP server should obtain n GSM triplets where n = 2 or n = 3. So the length is either:

1 (Method-Id) + 32 (RAND*2) +16 (NONCE_MT) = 49 or

1 (Method-Id) + 48 (RAND*3) + 16 (NONCE_MT) =65.

However, in fast-reauthentication, the Session-Id is:

Session-Id = 0x12 || NONCE_S || MAC

So the length is:

1 (Method-Id) + 16 (NONCE_S) + 16 (MAC) = 33

I found it surprising while implementing that the Session-Ids were different in lengths.

My next question is about Session-Id for PEAP. The draft currently defines Session-Id for EAP-PEAP as:


      Session-Id = 0x19 || client.random || server.random).

Do you plan to update this for TLS 1.3 and use TLS-Exporter in your other draft:  draft-dekok-emu-tls-eap-types? Do we need to do this twice in separate drafts?

--Mohit

On 5/22/19 7:42 PM, Alan DeKok wrote:

  Draft is here:

https://tools.ietf.org/html/draft-dekok-emu-eap-session-id-00

  This is a charter item:

https://datatracker.ietf.org/wg/emu/about/

- Define session identifiers for fast re-authentication for
EAP-SIM, EAP-AKA, and EAP-AKA’. The lack of this definition
is a recently discovered bug in the original RFCs.

  There have been minimal comments on the document.  What comments have been received are supportive.

  Alan DeKok.

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