Update

vendor/tailscale.com/ipn/localapi/serve.go

@@ -1,4 +1,4 @@
-// Copyright (c) Tailscale Inc & AUTHORS
+// Copyright (c) Tailscale Inc & contributors
 // SPDX-License-Identifier: BSD-3-Clause
 
 //go:build !ts_omit_serve
@@ -53,7 +53,8 @@ func (h *Handler) serveServeConfig(w http.ResponseWriter, r *http.Request) {
 			return
 		}
 
-		// require a local admin when setting a path handler
+		// require a local admin when setting a path handler or serving a Unix
+		// domain socket
 		// TODO: roll-up this Windows-specific check into either PermitWrite
 		// or a global admin escalation check.
 		if err := authorizeServeConfigForGOOSAndUserContext(runtime.GOOS, configIn, h); err != nil {
@@ -89,7 +90,7 @@ func authorizeServeConfigForGOOSAndUserContext(goos string, configIn *ipn.ServeC
 	if goos == "darwin" && version.IsSandboxedMacOS() {
 		return nil
 	}
-	if !configIn.HasPathHandler() {
+	if !configIn.HasPathHandler() && !configIn.IsServingUnixAny() {
 		return nil
 	}
 	if h.Actor.IsLocalAdmin(h.b.OperatorUserID()) {
@@ -97,9 +98,9 @@ func authorizeServeConfigForGOOSAndUserContext(goos string, configIn *ipn.ServeC
 	}
 	switch goos {
 	case "windows":
-		return errors.New("must be a Windows local admin to serve a path")
+		return errors.New("must be a Windows local admin to serve a path or Unix socket")
 	case "linux", "darwin", "illumos", "solaris":
-		return errors.New("must be root, or be an operator and able to run 'sudo tailscale' to serve a path")
+		return errors.New("must be root, or be an operator and able to run 'sudo tailscale' to serve a path or Unix socket")
 	default:
 		// We filter goos at the start of the func, this default case
 		// should never happen.