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David Anderson f570372b4d control/controlbase: don't enforce a max protocol version at handshake time. ... Doing so makes development unpleasant, because we have to first break the client by bumping to a version the control server rejects, then upgrade the control server to make it accept the new version. This strict rejection at handshake time is only necessary if we want to blocklist some vulnerable protocol versions in the future. So, switch to a default-permissive stance: until we have such a version that we have to eagerly block early, we'll accept whatever version the client presents, and leave it to the user of controlbase.Conn to make decisions based on that version. Noise still enforces that the client and server *agree* on what protocol version is being used, and the control server still has the option to finish the handshake and then hang up with an in-noise error, rather than abort at the handshake level. Updates #3488 Signed-off-by: David Anderson <danderson@tailscale.com>		4 years ago
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client.go	control/controlbase: make the protocol version number selectable.	4 years ago
http_test.go	control/controlbase: don't enforce a max protocol version at handshake time.	4 years ago
server.go	control/controlbase: don't enforce a max protocol version at handshake time.	4 years ago