How can I ensure that my app which is deployed on an EC2 only communicates using HTTPS?

Question

I currently have a web app deployed on an EC2 instance.
My EC2 instance is connected to CloudFront distribution and HTTPS is configured.
I redirect any HTTP to HTTPS in the cloud front but still one can connect to the EC2 using HTTP using Public IPv4 DNS.

Note:
- CloudFront and the EC2 communicate internally using HTTP and listen on port 80

Questions:
 - How can I ensure that a browser can access my web app using HTTPS and through CloudFront only?
 - Are their better practices or steps that I should follow or changes I should do to any of my configs ?

shibata · Answer

Use the Managed Prefix List to set up a Security Group that only allows access to port 80 from CloudFront.

https://aws.amazon.com/blogs/networking-and-content-delivery/limit-access-to-your-origins-using-the-aws-managed-prefix-list-for-amazon-cloudfront/

Didier_Durand · Answer

Hi,

To exactly achieve your goal of Cloudfront-only access, you want to use AWS-managed prefix list for Amazon CloudFront: see https://aws.amazon.com/about-aws/whats-new/2022/02/amazon-cloudfront-managed-prefix-list/

Documentation is at https://docs.aws.amazon.com/vpc/latest/userguide/working-with-aws-managed-prefix-lists.html

Best,

Didier

How can I ensure that my app which is deployed on an EC2 only communicates using HTTPS?

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