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ipn/ipnlocal: error when trying to use exit node on unsupported platform (#13726)

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Adds logic to `checkExitNodePrefsLocked` to return an error when
attempting to use exit nodes on a platform where this is not supported.
This mirrors logic that was added to error out when trying to use `ssh`
on an unsupported platform, and has very similar semantics.

Fixes https://github.com/tailscale/tailscale/issues/13724

Signed-off-by: Mario Minardi <mario@tailscale.com>
This commit is contained in:
Mario Minardi
2024-10-16 14:09:53 -06:00
committed by GitHub
parent 6a885dbc36
commit d32d742af0
7 changed files with 80 additions and 63 deletions
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26
client/web/web.go
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@ -26,6 +26,7 @@ import (
"tailscale.com/client/tailscale/apitype"
"tailscale.com/clientupdate"
"tailscale.com/envknob"
"tailscale.com/envknob/featureknob"
"tailscale.com/hostinfo"
"tailscale.com/ipn"
"tailscale.com/ipn/ipnstate"
@ -960,37 +961,16 @@ func (s *Server) serveGetNodeData(w http.ResponseWriter, r *http.Request) {
}
func availableFeatures() map[string]bool {
env := hostinfo.GetEnvType()
features := map[string]bool{
"advertise-exit-node": true, // available on all platforms
"advertise-routes": true, // available on all platforms
"use-exit-node": canUseExitNode(env) == nil,
"ssh": envknob.CanRunTailscaleSSH() == nil,
"use-exit-node": featureknob.CanUseExitNode() == nil,
"ssh": featureknob.CanRunTailscaleSSH() == nil,
"auto-update": version.IsUnstableBuild() && clientupdate.CanAutoUpdate(),
}
if env == hostinfo.HomeAssistantAddOn {
// Setting SSH on Home Assistant causes trouble on startup
// (since the flag is not being passed to `tailscale up`).
// Although Tailscale SSH does work here,
// it's not terribly useful since it's running in a separate container.
features["ssh"] = false
}
return features
}
func canUseExitNode(env hostinfo.EnvType) error {
switch dist := distro.Get(); dist {
case distro.Synology, // see https://github.com/tailscale/tailscale/issues/1995
distro.QNAP,
distro.Unraid:
return fmt.Errorf("Tailscale exit nodes cannot be used on %s.", dist)
}
if env == hostinfo.HomeAssistantAddOn {
return errors.New("Tailscale exit nodes cannot be used on Home Assistant.")
}
return nil
}
// aclsAllowAccess returns whether tailnet ACLs (as expressed in the provided filter rules)
// permit any devices to access the local web client.
// This does not currently check whether a specific device can connect, just any device.