tailscale/ipn
Michael Ben-Ami 1dc08f4d41 appc,feature/conn25: prevent clients from forwarding DNS requests and
modifying DNS responses for domains they are also connectors for

For Connectors 2025, determine if a client is configured as a
connector and what domains it is a connector for. When acting as a
client, don't install Split DNS routes to other connectors for those
domains, and don't alter DNS responses for those domains. The responses
are forwarded back to the original client, which in turn does the alteration,
swapping the real IP for a Magic IP.

A client is also a connector for a domain if it has tags that overlap
with tags in the configured policy, and --advertise-connector=true
in the prefs (not in the self-node Hostinfo from the netmap). We use the prefs
as the source of truth because control only gets a copy from the prefs, and
may drift. And the AppConnector field is currently zeroed out in the
self-node Hostinfo from control.

The extension adds a ProfileStateChange hook to process prefs changes,
and the config type is split into prefs and nodeview sub-configs.

Fixes tailscale/corp#39317

Signed-off-by: Michael Ben-Ami <mzb@tailscale.com>
2026-04-16 09:41:54 -04:00
..
auditlog all: use Go 1.26 things, run most gofix modernizers 2026-03-06 13:32:03 -08:00
conffile all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
desktop ipn/desktop: use runtime.Pinner to force heap-allocation of msg 2026-04-07 12:55:11 -05:00
ipnauth all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
ipnext feature/conn25,ipn/ipnext,ipn/ipnlocal: add ExtraRouterConfigRoutes hook 2026-03-25 19:28:33 -07:00
ipnlocal appc,feature/conn25: prevent clients from forwarding DNS requests and 2026-04-16 09:41:54 -04:00
ipnserver ipn/ipnserver: use peercreds for actor.Username on freebsd (for Taildrive) 2026-03-24 20:35:56 -07:00
ipnstate types/ptr: deprecate ptr.To, use Go 1.26 new 2026-03-05 20:13:18 -08:00
lapitest types/ptr: deprecate ptr.To, use Go 1.26 new 2026-03-05 20:13:18 -08:00
localapi ipn/localapi,client/local: add services over localapi 2026-04-13 11:47:23 -07:00
policy all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
store all: use Go 1.26 things, run most gofix modernizers 2026-03-06 13:32:03 -08:00
backend_test.go all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
backend.go ipn/ipnlocal: add netmap mutations to the ipn bus (#19120) 2026-04-09 15:45:41 -04:00
conf_test.go ipn: reject advertised routes with non-address bits set (#18649) 2026-03-20 10:10:43 -07:00
conf.go ipn: fix the typo causing NoSNAT always set to true (#19110) 2026-03-24 16:41:58 -04:00
doc.go all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
ipn_clone.go tailcfg: reintroduce UserProfile.Groups 2026-03-09 11:08:45 +00:00
ipn_test.go all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
ipn_view.go tailcfg: reintroduce UserProfile.Groups 2026-03-09 11:08:45 +00:00
prefs_test.go cmd/vet: add subtestnames analyzer; fix all existing violations 2026-04-05 15:52:51 -07:00
prefs.go ipn, cmd/tailscale/cli: allow setting FQDN sans dot as an exit node 2026-04-01 20:42:35 +01:00
serve_expand_test.go all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
serve_test.go cmd/vet: add subtestnames analyzer; fix all existing violations 2026-04-05 15:52:51 -07:00
serve.go all: use Go 1.26 things, run most gofix modernizers 2026-03-06 13:32:03 -08:00
store_test.go all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00
store.go all: remove AUTHORS file and references to it 2026-01-23 15:49:45 -08:00