Re: [quicwg/base-drafts] Client's initial destination CID is unauthenticated (#1486)

Igor Lubashev <notifications@github.com> Sun, 08 July 2018 19:35 UTC

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Subject: Re: [quicwg/base-drafts] Client's initial destination CID is unauthenticated (#1486)
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I am realizing that I am not the best person here to assess what exactly crypto protects against.  The TLS draft states the following, so I am (mis-?) reading it to mean that if client and server do not see the same original client's DCID, the handshake will fail.  (And the proposal is to include the "retry-initial" bit in the initial_secret computation.
```
initial_salt = 0x9c108f98520a5c5c32968e950e8a2c5fe06d6c38
initial_secret =
    HKDF-Extract(initial_salt, client_dst_connection_id)

client_initial_secret =
   HKDF-Expand-Label(initial_secret, "client in", Hash.length)
server_initial_secret =
   HKDF-Expand-Label(initial_secret, "server in", Hash.length)
```

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