[Docs]: Missed information about TLSv1.3

[EugenKon]

Documentation Link

https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/cloudfront_distribution#origin_ssl_protocols

Description

Amazon lists TLSv1.3 as supported protocol: https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/secure-connections-supported-viewer-protocols-ciphers.html

But in the document it is not listed:

2. In this document also is not clear what is "origin" means. Is this viewer or who?

References

No response

Would you like to implement a fix?

None

[github-actions]

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[acwwat]

For reference, both the API reference and AWS Go SDK v2 code seems to have only SSLv3, TLSv1, TLSv1.1, and TLSv1.2 listed.

However, the field is supposed to be for the minimum SSL/TLS protocol which is also known as the security policy described in Supported protocols and ciphers between viewers and CloudFront. For example, the TLSv1.2 security policies all support TLSv1.3 in the table on this page.

Maybe it's just to make sense of the information and document it properly to avoid confusion.

[acwwat]

So there are two sub-paths along the request path that HTTPS is configurable:

1. From the viewer (client) to CloudFront - This corresponds to the minimum_protocol_version argument in the viewer_certificate block and is as described in Supported protocols and ciphers between viewers and CloudFront.
2. From CloudFront to a custom origin - This corresponds to the origin_ssl_protocols in the custom_origin_config block and is as described in Requiring HTTPS for communication between CloudFront and your custom origin. With Terraform, you provide not a minimum SSL/TLS version but a list of SSL/TLS versions you want to support. It looks like it TLS 1.3 is NOT supported for this communication segment.

Illustration for good measure:

I will update the doc to provide similar description as OriginSslProtocols which includes a link to the Developer Guide. Hopefully this clarifies the argument usage a bit.

Nonetheless it's interesting that CloudFront doesn't support TLS1.3 for all scenarios by now. If I have time, I'll open a support case to inquire as I am now curious.

[github-actions]

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[github-actions]

This functionality has been released in v5.50.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

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[github-actions]

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