ipn/profiles: set default prefs based on Windows registry (#6803)

Co-authored-by: Maisem Ali maisem@tailscale.com

ipn/ipnlocal/profiles.go

@@ -9,6 +9,7 @@ import (
 	"errors"
 	"fmt"
 	"math/rand"
+	"net/netip"
 	"runtime"
 	"time"
 
@@ -19,6 +20,7 @@ import (
 	"tailscale.com/types/logger"
 	"tailscale.com/util/clientmetric"
 	"tailscale.com/util/strs"
+	"tailscale.com/util/winutil"
 	"tailscale.com/version"
 )
 
@@ -322,7 +324,7 @@ func (pm *profileManager) setAsUserSelectedProfileLocked() error {
 func (pm *profileManager) loadSavedPrefs(key ipn.StateKey) (ipn.PrefsView, error) {
 	bs, err := pm.store.ReadState(key)
 	if err == ipn.ErrStateNotExist || len(bs) == 0 {
-		return emptyPrefs, nil
+		return defaultPrefs, nil
 	}
 	if err != nil {
 		return ipn.PrefsView{}, err
@@ -394,15 +396,29 @@ func (pm *profileManager) writeKnownProfiles() error {
 func (pm *profileManager) NewProfile() {
 	metricNewProfile.Add(1)
 
-	pm.prefs = emptyPrefs
+	pm.prefs = defaultPrefs
 	pm.isNewProfile = true
 	pm.currentProfile = &ipn.LoginProfile{}
 }
 
-// emptyPrefs is the default prefs for a new profile.
-var emptyPrefs = func() ipn.PrefsView {
+// defaultPrefs is the default prefs for a new profile.
+var defaultPrefs = func() ipn.PrefsView {
 	prefs := ipn.NewPrefs()
 	prefs.WantRunning = false
+
+	prefs.ControlURL = winutil.GetPolicyString("LoginURL", "")
+
+	if exitNode := winutil.GetPolicyString("ExitNodeIP", ""); exitNode != "" {
+		if ip, err := netip.ParseAddr(exitNode); err == nil {
+			prefs.ExitNodeIP = ip
+		}
+	}
+
+	// Allow Incoming (used by the UI) is the negation of ShieldsUp (used by the
+	// backend), so this has to convert between the two conventions.
+	prefs.ShieldsUp = winutil.GetPolicyString("AllowIncomingConnections", "") == "never"
+	prefs.ForceDaemon = winutil.GetPolicyString("UnattendedMode", "") == "always"
+
 	return prefs.View()
 }()