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Re: [babel] [Babel-users] MAC auth. for Babel in babeld

Juliusz Chroboczek <jch@irif.fr> Wed, 23 September 2020 15:51 UTC

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Date: Wed, 23 Sep 2020 17:51:38 +0200
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From: Juliusz Chroboczek <jch@irif.fr>
To: Antonin Décimo <antonin.decimo@gmail.com>
Cc: Toke Høiland-Jørgensen <toke@toke.dk>, Babel at IETF <babel@ietf.org>, babel-users <babel-users@lists.alioth.debian.org>
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Subject: Re: [babel] [Babel-users] MAC auth. for Babel in babeld
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>> - I think the configuration is a bit verbose. This was the minimal
>> config I needed to enable MAC in babeld:
>> 
>> key name test algorithm hmac-sha256 value
>> 7465737474657374746573747465737474657374746573747465737474657374 use
>> both
>> keyset test
>> keyset-add-key test test
>> interface veth0 mac true add-keyset test
>> 
>> The two middle lines feel like they are a bit redundant; could we go
>> without them for simple configs?

> You’re right; at least the line `keyset test` can go, keysets are now
> implicitly created. I don’t see how I can further simplify without
> losing the idea that interfaces may share keysets and keysets may
> share keys.

Hmm... let's discuss the following ideas:

  - make "use both" optional;
  - rename "add-keyset" to just "keyset";
  - rename "keyset-add-key" to just "add-key";
  - allow the interface configuration to say "key", in which case we
    internally create an anonymous keyset with just one key.

This would make the minimal configuration be just:

  key name mykey algorithm hmac-sha256 value xxx
  interface veth0 mac true key mykey

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