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envknob, ipn/ipnlocal: add SSH admin kill switch

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Updates #3802

Change-Id: I6127907446d1a6be1b097d9ba3b534f2b8eb707f
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2022-03-23 13:52:29 -07:00
committed by Brad Fitzpatrick
parent 77b4fe0afa
commit d2f3ec8a63
3 changed files with 18 additions and 4 deletions
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7
envknob/envknob.go
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@@ -142,3 +142,10 @@ func LookupInt(envVar string) (v int, ok bool) {
// UseWIPCode is whether TAILSCALE_USE_WIP_CODE is set to permit use
// of Work-In-Progress code.
func UseWIPCode() bool { return Bool("TAILSCALE_USE_WIP_CODE") }
// CanSSHD is whether the Tailscale SSH server is allowed to run.
//
// If disabled, the SSH server won't start (won't intercept port 22)
// if already enabled and any attempt to re-enable it will result in
// an error.
func CanSSHD() bool { return !Bool("TS_DISABLE_SSH_SERVER") }