Which solution will meet these requirements?
Create an S3 bucket policy that permits access to the bucket from the public IP address range of the company’s on-premises data center.
Use IAM Roles Anywhere to obtain security credentials in IAM Identity Center that grant access to the S3 bucket. Configure the virtual machines to assume the role by using the AWS CLI.
Install the AWS CLI on the virtual machine. Configure the AWS CLI with access keys from an IAM user that has access to the bucket.
Create an IAM user and policy that grants access to the bucket. Store the access key and secret key for the IAM user in AWS Secrets Manager. Configure the application to retrieve the access key and secret key at startup.
Explanations:
Granting access based solely on the public IP address range of the on-premises data center is not secure and is not a recommended practice. It could expose the S3 bucket to unauthorized access if the IP range is not properly managed or if the application runs from an untrusted source.
Using IAM Roles Anywhere allows the on-premises application to obtain temporary security credentials from IAM Identity Center, providing secure access to the S3 bucket without hardcoding credentials. This method leverages temporary credentials, enhancing security.
Using access keys from an IAM user can lead to security vulnerabilities, as the keys need to be stored and managed securely. If compromised, these keys can be used to gain unauthorized access to the S3 bucket. Additionally, this does not provide temporary access, which is preferable for security.
Although this option involves the use of AWS Secrets Manager for storing credentials, it still requires managing long-term IAM user credentials (access key and secret key), which increases the risk of credential leakage and does not leverage temporary access.
I plot that the answer is:
Use IAM Roles Anywhere to obtain security credentials in IAM Identity Center that grant access to the S3 bucket. Configure the virtual machines to assume the role by using the AWS CLI.