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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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2
net/dns/manager.go
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@@ -485,7 +485,7 @@ func (m *Manager) FlushCaches() error {
// in case the Tailscale daemon terminated without closing the router.
// No other state needs to be instantiated before this runs.
func CleanUp(logf logger.Logf, netMon *netmon.Monitor, interfaceName string) {
oscfg, err := NewOSConfigurator(logf, nil, interfaceName)
oscfg, err := NewOSConfigurator(logf, nil, nil, interfaceName)
if err != nil {
logf("creating dns cleanup: %v", err)
return