Question

How to secure a signed url for uploading to spaces.

Posted on January 18, 2024
Security DigitalOcean Spaces
Asked by 50e0782ec2a94d689f2ac4589feb74

In my backend I create a signed url that the client uses for uploading directly to the storage.

I setup content-type and content-length by validating the request, but such parameters are then ignored when proceeding with the upload to the storage. I tried generating the url with one file then switching file and the upload still works fine.

I am worried of security issues with someone using a signed url to upload thousands of files or very large files. How likely is this to happen?

Thanks for your help!

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alexdo

Site Moderator

• January 22, 2024

Heya, @50e0782ec2a94d689f2ac4589feb74

Pre-signed URLs only offer temporary access for unauthorized users and eventually expire.

When generating a pre-signed URL, you can set the following parameters:

Bucket – bucket containing or will be containing the object
Key – object’s name
Expires – amount of time the URL is valid

You can ensure that the signed URLs have a limited expiration time. By setting a short expiration time, you reduce the window of opportunity for malicious activities.

Hope that this helps!