Merge pull request #36 from github/check-laptop-open

Don't try using SEP keys if laptop is closed

Author: mastahyeti

SoftU2FTool/U2FAuthenticator.swift

@@ -32,6 +32,15 @@ class U2FAuthenticator {
         return ua.stop()
     }
 
+    private var laptopIsOpen: Bool {
+        guard let screens = NSScreen.screens() else { return true }
+
+        return screens.contains { screen in
+            guard let screenID = screen.deviceDescription["NSScreenNumber"] as? uint32 else { return true }
+            return CGDisplayIsBuiltin(screenID) == 1
+        }
+    }
+
     init?() {
         guard let uh: U2FHID = U2FHID.shared else { return nil }
 
@@ -144,6 +153,12 @@ class U2FAuthenticator {
             return
         }
 
+        if reg.inSEP && !laptopIsOpen {
+            // Can't use SEP/TouchID if laptop is closed.
+            sendError(status: .OtherError, cid: cid)
+            return
+        }
+
         let facet = KnownFacets[req.applicationParameter]
         let notification = UserPresence.Notification.Authenticate(facet: facet)
         let skipTUP = reg.inSEP