I'm trying to set up a connection between my VPC in region B and an S3 bucket in region A. It works fine using a NAT gateway and allowing access through my security group set to 0.0.0.0/0. However, I want to tighten security a bit by restricting the security group to only allow access to the S3 prefix list from region A. The problem is that I can't seem to use prefix lists across regions, and creating my own list means I won't get automatic updates if AWS changes their network configurations. Any ideas on how to handle this?
3 Answers
Why not just set up IAM permissions to allow access from your VPC to that S3 bucket in region A? This way, you can limit access to only what’s necessary without exposing everything to 0.0.0.0/0. Just make sure to securely manage those permissions.
You can't use the S3 prefix list from another region because gateways are limited to the same VPC. What you could do is use an S3 interface endpoint, but keep in mind those don't span across regions, either. Your NAT route and IP restrictions approach makes sense for locking down access, but yeah, it's risky since IPs can change and you’d have to manage that manually.
Check out the documentation on S3 endpoints; it gives a breakdown of how they work in VPC setups. Since you're dealing with different regions, the limitations you've run into about prefix lists make sense. But using IAM for permissions is a solid approach. Just remember to keep those permissions tight!
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