Note: This post was first published April 21, 2016. The updated version aligns with the latest version of AWS WAF (AWS WAF v2) and includes screenshots that reflect the changes in the AWS console experience. AWS WAF Classic has been deprecated and will be end-of-life (EOL) in September 2025 …

February 14, 2025: This post was updated with the recommendation to restrict S3 bucket access to an IAM role by using the aws:PrincipalArn condition key instead of the aws:userid condition key. April 2, 2021: In the section “Granting cross-account bucket access to a specific IAM role,” we …