<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">(reposting to the list, I'll learn one of these days..)<br></div><div class="gmail_quote"><br>On Fri, Apr 6, 2018 at 7:59 PM, Jason A. Donenfeld <span dir="ltr"><<a href="mailto:Jason@zx2c4.com" target="_blank">Jason@zx2c4.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">[..]<br>
<br>
Let me know if you have any more questions or ways in which I can help<br>
you guys out with the p2p protocol.<br><br></blockquote><div><br><div>Hey, thanks for the reply. Another issue came up while I've been looking into this:<br><br></div><div>At
present, one has to manually add specific peers in order for WG to
authenticate them. I was wondering what the options are for dynamic
authentication, of peer keys that one doesn't know beforehand. The
typical example would be a PAKE but for us it would be an alternative
zero-knowledge proof that the initiator's key belongs to some
allowed-set of peers wrt the responder's key, as defined by the rest of
the protocol (I'm being vague because the details are TBD, actually).<br><br></div><div>It
would be nice to keep WG's current property of being able to
authenticate a client on the first packet without requiring further
communication. To reduce the DoS-potential of having to verify a complex
zk proof, we can probably also include a proof-of-work linked to a
recent global shared source of randomness (we have that in our
protocol). So one way would be for WG to hook into a custom function
that reads a custom certificate from the first incoming packet and say
whether it passes the test.<br><br>Alternatively we can listen on
another socket, perform the custom check on incoming packets here, and
then forward passing packets with our custom portion stripped out onto
the local WG socket. Hopefully this would "just work" if the "from"
address on the UDP packet is correct. However, initiating these would be
tricky, we'd have to intercept the WG initial outgoing packet and
rewrite it.<br><br></div><div>Other suggestions would be much appreciated.<br><br></div><div>X<br><br></div><div><div id="gmail-:6pl" class="gmail-ajR" tabindex="0"><span class="gmail-HOEnZb gmail-adL"></span></div></div><span class="gmail-HOEnZb gmail-adL"></span></div></div></div></div>