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Use CapVer to offer Noise only to supported clients

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This commit is contained in:
Juan Font Alonso 2022-08-15 23:35:06 +02:00
parent 865f1ffb3c
commit b3cf5289f8
2 changed files with 20 additions and 6 deletions
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6
api.go
View file

@ -25,12 +25,6 @@ const (
ErrRegisterMethodCLIDoesNotSupportExpire = Error(
"machines registered with CLI does not support expire",
)
// The CapabilityVersion is used by Tailscale clients to indicate
// their codebase version. Tailscale clients can communicate over TS2021
// from CapabilityVersion 28.
// See https://github.com/tailscale/tailscale/blob/main/tailcfg/tailcfg.go
NoiseCapabilityVersion = 28
)
func (h *Headscale) HealthHandler(

20
protocol_common.go
View file

@ -9,6 +9,19 @@ import (
"tailscale.com/tailcfg"
)
const (
// The CapabilityVersion is used by Tailscale clients to indicate
// their codebase version. Tailscale clients can communicate over TS2021
// from CapabilityVersion 28, but we only have good support for it
// since https://github.com/tailscale/tailscale/pull/4323 (Noise in any HTTPS port).
//
// Related to this change, there is https://github.com/tailscale/tailscale/pull/5379,
// where CapabilityVersion 39 is introduced to indicate #4323 was merged.
//
// See also https://github.com/tailscale/tailscale/blob/main/tailcfg/tailcfg.go
NoiseCapabilityVersion = 39
)
// KeyHandler provides the Headscale pub key
// Listens in /key.
func (h *Headscale) KeyHandler(
@ -18,6 +31,10 @@ func (h *Headscale) KeyHandler(
// New Tailscale clients send a 'v' parameter to indicate the CurrentCapabilityVersion
clientCapabilityStr := req.URL.Query().Get("v")
if clientCapabilityStr != "" {
log.Debug().
Str("handler", "/key").
Str("v", clientCapabilityStr).
Msg("New noise client")
clientCapabilityVersion, err := strconv.Atoi(clientCapabilityStr)
if err != nil {
writer.Header().Set("Content-Type", "text/plain; charset=utf-8")
@ -52,6 +69,9 @@ func (h *Headscale) KeyHandler(
return
}
}
log.Debug().
Str("handler", "/key").
Msg("New legacy client")
// Old clients don't send a 'v' parameter, so we send the legacy public key
writer.Header().Set("Content-Type", "text/plain; charset=utf-8")