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wgengine/netstack: add an SSH server experiment

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Disabled by default.

To use, run tailscaled with:

    TS_SSH_ALLOW_LOGIN=you@bar.com

And enable with:

    $ TAILSCALE_USE_WIP_CODE=true tailscale up --ssh=true

Then ssh [any-user]@[your-tailscale-ip] for a root bash shell.
(both the "root" and "bash" part are temporary)

Updates #3802

Change-Id: I268f8c3c95c8eed5f3231d712a5dc89615a406f0
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2021-08-26 14:50:55 -07:00
committed by Brad Fitzpatrick
parent 41fd4eab5c
commit f3c0023add
11 changed files with 233 additions and 14 deletions
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4
envknob/envknob.go
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@@ -100,3 +100,7 @@ func LookupInt(envVar string) (v int, ok bool) {
log.Fatalf("invalid environment variable %s value %q: %v", envVar, val, err)
panic("unreachable")
}
// 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") }