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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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12
tailcfg/tailcfg.go
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@@ -139,7 +139,8 @@ type CapabilityVersion int
// - 96: 2024-05-29: Client understands NodeAttrSSHBehaviorV1
// - 97: 2024-06-06: Client understands NodeAttrDisableSplitDNSWhenNoCustomResolvers
// - 98: 2024-06-13: iOS/tvOS clients may provide serial number as part of posture information
const CurrentCapabilityVersion CapabilityVersion = 98
// - 99: 2024-06-14: Client understands NodeAttrDisableLocalDNSOverrideViaNRPT
const CurrentCapabilityVersion CapabilityVersion = 99
type StableID string
@@ -2306,6 +2307,15 @@ const (
// and this node attribute allows us to disable the optimization remotely
// if needed.
NodeAttrDisableSplitDNSWhenNoCustomResolvers NodeCapability = "disable-split-dns-when-no-custom-resolvers"
// NodeAttrDisableLocalDNSOverrideViaNRPT indicates that the node's DNS manager should not
// create a default (catch-all) Windows NRPT rule when "Override local DNS" is enabled.
// 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.
// We began creating this rule on 2024-06-14, and this node attribute
// allows us to disable the new behavior remotely if needed.
NodeAttrDisableLocalDNSOverrideViaNRPT NodeCapability = "disable-local-dns-override-via-nrpt"
)
// SetDNSRequest is a request to add a DNS record.