Rule: S3 Buckets Should Have Cross-Region Replication Enabled

Rule Description:

Troubleshooting Steps:

2. 1.

   Verify the S3 bucket settings:

   • Go to the AWS Management Console and navigate to the S3 service.
   • Select the bucket in question.
   • Click on the "Properties" tab.
   • Verify if the "Replication" option is enabled or not.
4. 2.

   Verify IAM permissions:

   • Ensure that the IAM user or role accessing the S3 bucket has the necessary permissions to enable cross-region replication.
   • Verify the IAM policy associated with the user or role allows the "s3:GetReplicationConfiguration" and "s3:PutReplicationConfiguration" actions.
6. 3.

   Check bucket versioning:

   • Ensure that versioning is enabled for the bucket.
   • Without versioning, cross-region replication cannot be configured.
   • To enable versioning, go to the bucket properties, select the "Versioning" tab, and enable versioning for the bucket.
8. 4.

   Review regional restrictions:

   • Confirm that the desired destination region for replication is available for selection.
   • Certain AWS regions might have limitations on cross-region replication due to compliance or other reasons.

Necessary Codes:

2. 1.

   To enable cross-region replication for an S3 bucket:

   aws s3api put-bucket-replication --bucket <bucket-name> --replication-configuration file://replication-config.json
   

   Replace

   <bucket-name>

   with the name of the S3 bucket, and

   replication-config.json

   with the JSON configuration file that specifies the replication rules.

4. 2.

   To create a replication configuration JSON file:

   {
   	"Role": "<ARN of IAM role>",
   	"Rules": [{
   		"Status": "Enabled",
   		"Prefix": "",
   		"Destination": {
   			"Bucket": "arn:aws:s3:::<destination-bucket>",
   			"StorageClass": "<storage-class>",
   			"BucketAccountId": "<destination-account-ID>"
   		}
   	}]
   }
   

   Replace

   <ARN of IAM role>

   with the ARN (Amazon Resource Name) of the IAM role allowing cross-region replication,

   <destination-bucket>

   with the ARN of the destination bucket,

   <storage-class>

   with the desired storage class (e.g., STANDARD, GLACIER), and

   <destination-account-ID>

   with the account ID of the destination bucket.

Remediation Steps:

2. 1.

   Go to the AWS Management Console and navigate to the S3 service.

4. 2.

   Select the bucket that violates the rule.

6. 3.

   Click on the "Properties" tab.

8. 4.

   Under the "Replication" option, click on the "Edit" button.

10. 5.

    Enable the "Cross-Region Replication" option.

12. 6.

    Specify the desired destination bucket, storage class, and destination account ID.

14. 7.

    Save the changes and confirm the replication configuration.

16. 8.

    Verify that the bucket now shows cross-region replication as enabled.

18. 9.

    Repeat the process for any remaining non-compliant S3 buckets.