Safeguard your Firebase database listeners against potential web DOS attacks and unauthorized access to sensitive credentials

Firebase is such a game-changer on mobile devices, but it's not always the best fit for web applications. This is common knowledge.

  1. I rely on firebase
  2. My users are aware of the database URL
  3. They can view certain aspects of the database that I've granted them access to
  4. A DOS attack could occur if too many listeners are opened to the database

I am looking to set up a listener for news feeds, bookmarked posts, and post drafts so that users can seamlessly continue editing from their phones. While I appreciate the security rules in place to protect user data, they don't shield me from potential misuse.

Is there an alternative method to achieve real-time synchronization without compromising security? Perhaps without relying solely on cloud functions running checks continuously or upon user interaction?

javascriptsecurityfirebasefirebase-realtime-databasereal-time

Answer №1

After encountering similar issues, I discovered a solution to effectively limit the length of publicly writable data in Firebase.

Imagine you have a chatbox database that stores user name and message.

service cloud.firestore {
  match /databases/{database}/documents {
    match /chatroom/{document=**} {
      allow read: if true;
      allow write: if resource.data.message.length <= 260 && resource.data.name.length <= 20;
    }
  }
}

By implementing these restrictions, I can effectively prevent overwhelming the database with excessive requests. (Note that this filter does not limit the length of input, but rather filters out attempts) Refer to: How to limit string length in firebase

In terms of DOS attacks through excessive data reading via many listeners, this setup may not provide a significant vulnerability as attacking would be as resource-intensive as being targeted.

Essentially, Firebase's resilience relies heavily on configuring solid access rules. Nowadays, most large-scale apps require some level of authentication. By simply requiring authentication, such as Google sign-in, for database read/write operations, concerns about DOS attacks can be minimized significantly.

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