I want to add firebase cloud storage security rules so that my file can be access by set of people's. List of people's are in my firebase database.
Can anyone help me please?
There is no way to access the Firebase Database from your Cloud Storage for Firebase security rules. You will have to set the information into the token for each user, and then access that in your storage rules.
Also see:
Restrict firebase database and storage write access to a specific group
is there a way to authenticate user role in firebase storage rules?
Create group access to firebase storage without using custom authorization
Some of these show embedding the UIDs in the security rules, which used to be the only way to do this. But nowadays you should probably user custom claims for this, as shown in Bojeil's answer to the first question above.
Related
My android wallpaper app is connected to Firebase Cloud Firestore. It doesn't have any user authentication because I want the user to be able to use it without fuss. To do this, it must be in open access, meaning, the user is allowed to read and write. This is dangerous as he can also edit and modify the data if he knows the project id. The project id is visible in the url of the app so this is not really a good choice. Closed access is also not an option for obvious reasons.
Is there anything I can do to protect my data without need of a user authentication? I would love to see the code needed for the Cloud Firestore and Storage to protect the data. I want the user to read only and I, as the owner, should be the only one who could write. Please refer to the images attached. Thanks a lot for taking time to answer my questions.
My data structure in Firebase Cloud Firestore:
Securing your data with Security Rules
Firebase Cloud Firestore, Firebase Realtime Database and Firebase Cloud Storage are secured by their own Security Rules. They provide access control and data validation in a simple yet expressive format and allow you to control access to documents and collections in your database.
To build user-based and role-based access systems that keep your users' data safe, you need to use Firebase Authentication with Cloud Firestore Security Rules.
Your specific use case
I assume that you store your data in Firebase Cloud Firestore and the wallpapers in Firebase Cloud Storage. The user then gets a document with a link to download a wallpaper and maybe also can upload their own wallpapers to the database.
The dangers of an open database
As you mentioned allowing all reads and writes to your database in a production app is very dangerous. Obviously, anyone with your database reference will be able to read or write data to your database. Unauthorized users could destroy your backend and there are also possibilities that costs could increase exponentially. Therefore this is not recommended. There always should be some mechanisms preventing these scenarios.
Recommendation: Using anonymous authentication first and connect later with existing Identity Providers
I recommend that you use Firebase Authentication to create and use temporary anonymous accounts to authenticate with Firebase. These temporary anonymous accounts can be used to allow users who haven't yet signed up to your app to work with data protected by security rules while not being in the way of your user experience. If an anonymous user later decides to sign up to your app, you can link their sign-in credentials to the anonymous account so that they can continue to work with their protected data in future sessions.
You could also enable Google-Sign-In, Facebook Login, Twitter, GitHub, Microsoft, Yahoo, etc. to let users authenticate in a very fast and easy way without compromising on a security standpoint if using regular password authentication is not what you want (from a UX standpoint). FirebaseUI makes it really easy to add these to your existing app. Check out the official documentation on this topic.
Implementing Cloud Firestore Security Rules
The official documentation on this is really great on how to get started with Cloud Firestore Security Rules.
However these security rules could work for you:
Allow read access to all users to the root (Not recommended because this can create huge costs in production). Users don't have write (create, update, delete) access. In this case you can edit your data via the Firebase Console. Choose either option 1 or option 2 for your project.
rules_version = '2';
service cloud.firestore {
match /databases/{database}/documents {
// Option 1: Matches any document in the 'root' collection.
match /root/{rumiXYZ} {
allow read: if true;
allow write: if false;
}
// Option 2: Matches any document in the 'root' collection or subcollections.
match /root/{document=**} {
allow read: if true;
allow write: if false;
}
}
}
The {document=**} path in the rules above can be used to match any document in the collection/subcollections or in the entire database. This should however not be necessary for your use case. Continue on to the guide for structuring security rules to learn how to match specific data paths and work with hierarchical data.
Don't forget to secure your Firebase Cloud Storage too!
I have migrated data to firebase storage, which have structure like:
<fileId>/<filename>
I can store fileIds associated with user in firebase database like:
<userId>/<fileids>
Is there anyway I can get something like auth.uid/fileids from firebase database in security rules of firestorage, to only allow to read file to auth user, if fileIds belong to him. If not, what all options are available to achieve the same and which one is best among them?
It's currently not possible to use data from databases in your Cloud Storage security rules. You can only use information about the object stored in the bucket.
You could instead write a backend API that performs all the checks and then operates on the object in storage, or store information about the file in its metadata for use in rules.
I would like to use data in the realtime database to allow user access in the firestore database. Is it possible to reference nodes in the realtime database from the firestore security rules?
It is currently not possible to cross between database products like this in security rules. Please feel free to file a feature request for this.
You can, however, write code to run on Cloud Functions that deals with database changes after the change has happened, and undo or restrict the change there.
I have created an app, that allows users to create a simple photo collection. All the data is stored in the Firebase Cloud Firestore. The images are uploaded to Firebase Storage.
The owner of a collection can invite any other user to access his collection and upload photos.
The sharing of data in Firestore works fine. But now I have problems with writing the security rules for Storage. Does anyone know, how I have to write the rules, so that any user added to the collection can access the images as well? The files for each collection are stored in separate folders.
Firebase security rules currently do not bridge between products. You can't use data in Cloud Firestore in security rules for Cloud Storage. The only things you have access to in security rules for Cloud Storage are object metadata and Firebase Authentication custom claims per user. You will have to figure out a way to make changes to either one of those things to implement your permissions.
Alternatively, you can direct all access through Cloud Functions to decide if the user should be able to access the content, but bear in mind that Cloud Functions responses can only be 10MB maximum.
You should look into creating a private group and authenticate the group with help of private token.
https://firebase.google.com/docs/storage/security/user-security#group_private
I understand that I can specify rules for some features in firebase like real-time database and firebase storage.
Example:
I can specify a rule in real time database that allows only users to update their data under their specific UID.
Question:
Is it possible to specify a rule in firebase storage such that a user can download a file (ex: image) if and only if he exists under a certain node in the real time database?
Is this communication between security rules of different products possible?
If no, what can I do?
Thanks.
You can't communicate between products like this.
What you can do instead is use custom claims on authenticated user profiles to control who can access what locations in various products.
Read more about custom claims here.
Read more about realtime database rules with custom claims. Read about auth.token.
In Firestore, you can use request.auth.token to access custom claims.
In Cloud Storage, you can also use request.auth.token.