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This is so that we can plumb our client capability version through the protocol as the Noise version. The capability version increments more frequently than strictly required (the Noise version only needs to change when cryptographically-significant changes are made to the protocol, whereas the capability version also indicates changes in non-cryptographically-significant parts of the protocol), but this gives us a safe pre-auth way to determine if the client supports future protocol features, while still relying on Noise's strong assurance that the client and server have agreed on the same version. Currently, the server executes the same protocol regardless of the version number, and just presents the version to the caller so they can do capability-based things in the upper RPC protocol. In future, we may add a ratchet to disallow obsolete protocols, or vary the Noise handshake behavior based on requested version. Updates #3488 Signed-off-by: David Anderson <danderson@tailscale.com>
29 lines
1009 B
Go
29 lines
1009 B
Go
// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package controlclient
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import (
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"math"
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"testing"
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"tailscale.com/tailcfg"
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)
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// maxAllowedNoiseVersion is the highest we expect the Tailscale
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// capability version to ever get. It's a value close to 2^16, but
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// with enough leeway that we get a very early warning that it's time
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// to rework the wire protocol to allow larger versions, while still
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// giving us headroom to bump this test and fix the build.
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//
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// Code elsewhere in the client will panic() if the tailcfg capability
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// version exceeds 16 bits, so take a failure of this test seriously.
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const maxAllowedNoiseVersion = math.MaxUint16 - 5000
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func TestNoiseVersion(t *testing.T) {
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if tailcfg.CurrentCapabilityVersion > maxAllowedNoiseVersion {
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t.Fatalf("tailcfg.CurrentCapabilityVersion is %d, want <=%d", tailcfg.CurrentCapabilityVersion, maxAllowedNoiseVersion)
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}
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}
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