Add optional permissions_boundary (#265)

* Add optional permissions_boundary

* Update CHANGELOG

Author: dylanhellems

CHANGELOG.md

@@ -11,6 +11,7 @@ project adheres to [Semantic Versioning](http://semver.org/).
 
 ##### Added
 
+- Ability to specify a permissions_boundary for IAM roles (by @dylanhellems)
 - Ability to configure force_delete for the worker group ASG (by @stefansedich)
 - Ability to configure worker group ASG tags (by @stefansedich)
 - Added EBS optimized mapping for the g3s.xlarge instance type (by @stefansedich)

README.md

@@ -130,6 +130,7 @@ MIT Licensed. See [LICENSE](https://github.com/terraform-aws-modules/terraform-a
 | map\_roles\_count | The count of roles in the map_roles list. | string | `"0"` | no |
 | map\_users | Additional IAM users to add to the aws-auth configmap. See examples/eks_test_fixture/variables.tf for example format. | list | `[]` | no |
 | map\_users\_count | The count of roles in the map_users list. | string | `"0"` | no |
+| permissions\_boundary | If provided, all IAM roles will be created with this permissions boundary attached. | string | `""` | no |
 | subnets | A list of subnets to place the EKS cluster and workers within. | list | n/a | yes |
 | tags | A map of tags to add to all resources. | map | `{}` | no |
 | vpc\_id | VPC where the cluster and workers will be deployed. | string | n/a | yes |

cluster.tf

@@ -52,6 +52,7 @@ resource "aws_security_group_rule" "cluster_https_worker_ingress" {
 resource "aws_iam_role" "cluster" {
   name_prefix           = "${var.cluster_name}"
   assume_role_policy    = "${data.aws_iam_policy_document.cluster_assume_role_policy.json}"
+  permissions_boundary  = "${var.permissions_boundary}"
   force_detach_policies = true
 }
 

variables.tf

@@ -216,3 +216,8 @@ variable "worker_create_security_group" {
   description = "Whether to create a security group for the workers or attach the workers to `worker_security_group_id`."
   default     = true
 }
+
+variable "permissions_boundary" {
+  description = "If provided, all IAM roles will be created with this permissions boundary attached."
+  default     = ""
+}

workers.tf

@@ -114,6 +114,7 @@ resource "aws_security_group_rule" "workers_ingress_cluster_https" {
 resource "aws_iam_role" "workers" {
   name_prefix           = "${aws_eks_cluster.this.name}"
   assume_role_policy    = "${data.aws_iam_policy_document.workers_assume_role_policy.json}"
+  permissions_boundary  = "${var.permissions_boundary}"
   force_detach_policies = true
 }