tailscale/ipn/policy/policy.go

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// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package policy contains various policy decisions that need to be
// shared between the node client & control server.
package policy
import (
"tailscale.com/tailcfg"
)
// IsInterestingService reports whether service s on the given operating
// system (a version.OS value) is an interesting enough port to report
// to our peer nodes for discovery purposes.
func IsInterestingService(s tailcfg.Service, os string) bool {
switch s.Proto {
case tailcfg.PeerAPI4, tailcfg.PeerAPI6, tailcfg.PeerAPIDNS:
return true
}
if s.Proto != tailcfg.TCP {
return false
}
if os != "windows" {
// For non-Windows machines, assume all TCP listeners
// are interesting enough. We don't see listener spam
// there.
return true
}
// Windows has tons of TCP listeners. We need to move to a blacklist
// model later, but for now we just whitelist some common ones:
switch s.Port {
case 22, // ssh
80, // http
443, // https (but no hostname, so little useless)
3389, // rdp
5900, // vnc
32400, // plex
// And now some arbitrary HTTP dev server ports:
// Eventually we'll remove this and make all ports
// work, once we nicely filter away noisy system
// ports.
8000, 8080, 8443, 8888:
return true
}
return false
}