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[176.190.174.144]) by smtp.gmail.com with ESMTPSA id x2sm1280601wrg.73.2020.08.28.15.46.16 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 28 Aug 2020 15:46:17 -0700 (PDT) Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Cc: "Babel at IETF" , "babel-users" From: =?utf-8?q?Antonin_D=C3=A9cimo?= To: "Juliusz Chroboczek" Date: Fri, 28 Aug 2020 22:41:11 +0200 Message-Id: In-Reply-To: <871rjsmdt7.wl-jch@irif.fr> Archived-At: Subject: Re: [babel] MAC auth. for Babel in babeld X-BeenThere: babel@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "A list for discussion of the Babel Routing Protocol." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 28 Aug 2020 22:46:21 -0000 Another thing that could be added: a separate table for uncompleted challenges (see en paragraph of section 7). > > There is one feature that I have not implemented (yet): expiring > > per-neighbour state (section 4.4) using the Hello history or a timer > > based on the last accepted packet. > > Yes, you have :-) Well that=E2=80=99s a relief! > Please find out if you're allowed to enter the office (not obvious > due to COVID). If not, I'll ask the boss for permission, or else > we'll meet at my place. You=E2=80=99ll have to invite me to allow me to enter the premises =F0=9F= =A7=9B > > I=E2=80=99m also looking for feedback on the user interface. [...] In > > particular, do you think that implementing keysets and allowing an > > unbounded number of keys is too much for babeld? > > As a general rule, I'm in favour of reflecting the implementation > details in the user interface to the extent possible -- if you don't > do that, the interface becomes confusing to the user who cannot > build an accurate mental model of what's going on. After some failed attemps, I had started the other way around and designed the most complete user interfacte I could think of, and then build the implementation to match that model. > If that's too complicated, I'd rather we add some macros than dumb > down the interface. (Commands that expand to a sequence of > lower-level commands.) Hmm, nice idea. We could have a single keyset of two key slots, shared by all interfaces, with the simplest user interface. We can have a pre-configured timer for key rotation during which both keys would be available. interface default mac true rotate-key hmac-sha256 0000 =E2=80=A6 rotate-key hmac-sha256 1111 It=E2=80=99s not clear right now how the 'complete' and the 'simple' interf= ace could be used in the same time, but that is absolutely workable. > You should consider what happens to your code when there are too many > keys, and the MACs no longer fit in a packet. A silent failure would be > bad. The packet is not send. There are two error messages. The buffer is discarded. -- Antonin