AWS EMR Clusters are not configured with Kerberos authentication. This may lead to potential security risks.
To configure Kerberos in the AWS EMR environment, there are several components required including the authentication environment (such as Active Directory). Once that is prepared, follow the directions in the AWS documentation (below) to use that environment in the principals section of an EMR Configuration.
In Terraform -
References:
https://docs.aws.amazon.com/emr/latest/ManagementGuide/emr-kerberos.html
https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/emr_cluster#kerberos_attributes