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various: create a catch-all NRPT rule when "Override local DNS" is enabled on Windows

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Without this rule, Windows 8.1 and newer devices issue parallel DNS requests to DNS servers
associated with all network adapters, even when "Override local DNS" is enabled and/or
a Mullvad exit node is being used, resulting in DNS leaks.

This also adds "disable-local-dns-override-via-nrpt" nodeAttr that can be used to disable
the new behavior if needed.

Fixes tailscale/corp#20718

Signed-off-by: Nick Khyl <nickk@tailscale.com>
This commit is contained in:
Nick Khyl
2024-06-10 22:05:15 -05:00
committed by Nick Khyl
parent 7354547bd8
commit c32efd9118
11 changed files with 75 additions and 15 deletions
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4
cmd/tailscaled/tailscaled.go
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@@ -698,7 +698,7 @@ func tryEngine(logf logger.Logf, sys *tsd.System, name string) (onlyNetstack boo
// configuration being unavailable (from the noop
// manager). More in Issue 4017.
// TODO(bradfitz): add a Synology-specific DNS manager.
conf.DNS, err = dns.NewOSConfigurator(logf, sys.HealthTracker(), "") // empty interface name
conf.DNS, err = dns.NewOSConfigurator(logf, sys.HealthTracker(), sys.ControlKnobs(), "") // empty interface name
if err != nil {
return false, fmt.Errorf("dns.NewOSConfigurator: %w", err)
}
@@ -726,7 +726,7 @@ func tryEngine(logf logger.Logf, sys *tsd.System, name string) (onlyNetstack boo
return false, fmt.Errorf("creating router: %w", err)
}
d, err := dns.NewOSConfigurator(logf, sys.HealthTracker(), devName)
d, err := dns.NewOSConfigurator(logf, sys.HealthTracker(), sys.ControlKnobs(), devName)
if err != nil {
dev.Close()
r.Close()