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control/controlclient, tailcfg: add support for EarlyNoise payload before http/2

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Not yet used, but skipped over, parsed, and tested.

Updates #5972

Change-Id: Icd00196959ce266ae16a6c9244bd5e458e2c2947
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2022-10-30 08:42:54 -07:00
committed by Brad Fitzpatrick
parent a7f7e79245
commit 988c1f0ac7
3 changed files with 164 additions and 24 deletions
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12
tailcfg/tailcfg.go
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@@ -1946,3 +1946,15 @@ type PeerChange struct {
//
// Mnemonic: 3.3.40 are numbers above the keys D, E, R, P.
const DerpMagicIP = "127.3.3.40"
// EarlyNoise is the early payload that's sent over Noise but before the HTTP/2
// handshake when connecting to the coordination server.
//
// This exists to let the server push some early info to client for that
// stateful HTTP/2+Noise connection without incurring an extra round trip. (This
// would've used HTTP/2 server push, had Go's client-side APIs been available)
type EarlyNoise struct {
// NodeKeyChallenge is a random per-connection public key to be used by
// the client to prove possession of a wireguard private key.
NodeKeyChallenge key.ChallengePublic `json:"nodeKeyChallenge"`
}