Rule: S3 Bucket Cross-Region Replication Should Be Enabled

Rule Description

Troubleshooting Steps

2. 1.
   Check AWS region availability: Ensure that both the source and destination regions for cross-region replication are supported by AWS.
4. 2.
   Verify IAM permissions: Make sure the IAM user or role you are using has the necessary permissions to enable cross-region replication. Ensure that you have 's3:GetBucketReplication' and 's3:PutBucketReplication' permissions.
6. 3.
   Check bucket versioning: Cross-region replication requires versioning to be enabled for the S3 bucket. Verify that versioning is enabled for both the source and destination buckets.
8. 4.
   Verify bucket ownership: Ensure that you own both the source and destination S3 buckets, or have the necessary permissions to configure cross-region replication for those buckets. Only the bucket owner or an IAM user with sufficient permissions can enable cross-region replication.
10. 5.
    Check bucket names: Bucket names must be unique across all AWS accounts. Confirm that the bucket names you are using for cross-region replication are not already in use.
12. 6.
    Review bucket policies: If you have existing S3 bucket policies applied, ensure that they do not interfere with or restrict cross-region replication. Adjust the policies accordingly if needed.

Necessary Codes

aws s3api put-bucket-replication \
    --bucket SOURCE_BUCKET_NAME \
    --replication-configuration \
      '{ 
          "Role": "arn:aws:iam::DESTINATION_ACCOUNT_ID:role/DESTINATION_BUCKET_ROLE",
          "Rules": [
              {
                  "Status": "Enabled",
                  "Prefix": "",
                  "Destination": {
                      "Bucket": "arn:aws:s3:::DESTINATION_BUCKET_NAME",
                      "StorageClass": "STANDARD"
                  }
              }
          ]
      }'

Step-by-Step Guide for Remediation

2. 1.

   Verify AWS CLI: Ensure that you have the AWS Command Line Interface (CLI) installed on your system and configured with valid credentials.

4. 2.

   Identify source and destination buckets: Determine the names of the S3 buckets that will be involved in cross-region replication. Choose one bucket to be the "source" and another as the "destination."

6. 3.

   Enable versioning: If versioning is not already enabled for both the source and destination buckets, perform the following steps:

   • Open the AWS S3 console.
   • Select the source bucket.
   • Go to the "Properties" tab.
   • Click on "Versioning."
   • Enable versioning and confirm the changes.
   • Repeat the same steps for the destination bucket.
8. 4.

   Create an IAM role for the destination: If you have not already created an IAM role with appropriate permissions for the destination bucket in the target AWS region, perform the following steps:

   • Open the AWS IAM console.
   • Go to "Roles" and click on "Create role."
   • Select the "Another AWS account" option.
   • Enter the destination AWS account ID and proceed to the next step.
   • Attach the necessary policies to allow cross-region replication.
   • Save the IAM role with a suitable name.
10. 5.

    Execute the AWS CLI command: Open your command line interface and execute the provided AWS CLI code, replacing the placeholders with the actual values:

    • SOURCE_BUCKET_NAME

      : Enter the name of the source bucket.

    • DESTINATION_ACCOUNT_ID

      : Replace it with the AWS account ID of the destination region.

    • DESTINATION_BUCKET_ROLE

      : Provide the IAM role ARN for the destination bucket in the target AWS region.

    • DESTINATION_BUCKET_NAME

      : Replace it with the name of the destination bucket.
12. 6.

    Verify cross-region replication: After executing the command successfully, you should verify that cross-region replication is enabled:

    • Go to the AWS S3 console.
    • Select the source bucket.
    • Open the "Management" tab.
    • Click on "Replication."

    The console should display the replication configuration and its status. Ensure that it shows "Enabled."