firestore.rules

rules_version = '2';
service cloud.firestore {
  match /databases/{database}/documents {
    match /users/{userId} {
      allow read: if request.auth != null
      match /private/info {
        allow write: if request.auth && request.auth.uid == userId
        allow read: if request.auth && request.auth.uid == userId
      }
    }
  }
}