feat: Allow removing KMS and SSM permissions from EKS IRSA external secrets policy (#550)

Co-authored-by: Bryant Biggs <bryantbiggs@gmail.com>

Author: Bryce Lowe

.pre-commit-config.yaml

@@ -1,6 +1,6 @@
 repos:
   - repo: https://github.com/antonbabenko/pre-commit-terraform
-    rev: v1.96.3
+    rev: v1.99.0
     hooks:
       - id: terraform_fmt
       - id: terraform_wrapper_module_for_each

modules/iam-role-for-service-accounts-eks/policies.tf

@@ -110,6 +110,7 @@ data "aws_iam_policy_document" "cluster_autoscaler" {
   dynamic "statement" {
     # TODO - remove *_ids at next breaking change
     for_each = toset(coalescelist(var.cluster_autoscaler_cluster_ids, var.cluster_autoscaler_cluster_names))
+
     content {
       actions = [
         "autoscaling:SetDesiredCapacity",
@@ -306,6 +307,7 @@ data "aws_iam_policy_document" "ebs_csi" {
 
   dynamic "statement" {
     for_each = length(var.ebs_csi_kms_cmk_ids) > 0 ? [1] : []
+
     content {
       actions = [
         "kms:CreateGrant",
@@ -325,6 +327,7 @@ data "aws_iam_policy_document" "ebs_csi" {
 
   dynamic "statement" {
     for_each = length(var.ebs_csi_kms_cmk_ids) > 0 ? [1] : []
+
     content {
       actions = [
         "kms:Encrypt",
@@ -455,6 +458,7 @@ data "aws_iam_policy_document" "mountpoint_s3_csi" {
 
   dynamic "statement" {
     for_each = length(var.mountpoint_s3_csi_kms_arns) > 0 ? [1] : []
+
     content {
       actions = [
         "kms:GenerateDataKey",
@@ -539,12 +543,17 @@ data "aws_iam_policy_document" "external_secrets" {
     resources = ["*"]
   }
 
-  statement {
-    actions = [
-      "ssm:GetParameter",
-      "ssm:GetParameters",
-    ]
-    resources = var.external_secrets_ssm_parameter_arns
+  dynamic "statement" {
+    for_each = length(var.external_secrets_ssm_parameter_arns) > 0 ? [1] : []
+
+    content {
+      actions = [
+        "ssm:GetParameter",
+        "ssm:GetParameters",
+      ]
+
+      resources = var.external_secrets_ssm_parameter_arns
+    }
   }
 
   statement {
@@ -562,13 +571,18 @@ data "aws_iam_policy_document" "external_secrets" {
     resources = var.external_secrets_secrets_manager_arns
   }
 
-  statement {
-    actions   = ["kms:Decrypt"]
-    resources = var.external_secrets_kms_key_arns
+  dynamic "statement" {
+    for_each = length(var.external_secrets_kms_key_arns) > 0 ? [1] : []
+
+    content {
+      actions   = ["kms:Decrypt"]
+      resources = var.external_secrets_kms_key_arns
+    }
   }
 
   dynamic "statement" {
     for_each = var.external_secrets_secrets_manager_create_permission ? [1] : []
+
     content {
       actions = [
         "secretsmanager:CreateSecret",
@@ -581,9 +595,11 @@ data "aws_iam_policy_document" "external_secrets" {
 
   dynamic "statement" {
     for_each = var.external_secrets_secrets_manager_create_permission ? [1] : []
+
     content {
       actions   = ["secretsmanager:DeleteSecret"]
       resources = var.external_secrets_secrets_manager_arns
+
       condition {
         test     = "StringEquals"
         variable = "secretsmanager:ResourceTag/managed-by"
@@ -631,6 +647,7 @@ data "aws_iam_policy_document" "fsx_lustre_csi" {
   statement {
     actions   = ["iam:CreateServiceLinkedRole"]
     resources = ["*"]
+
     condition {
       test     = "StringLike"
       variable = "iam:AWSServiceName"
@@ -1201,6 +1218,7 @@ data "aws_iam_policy_document" "appmesh_controller" {
       "iam:CreateServiceLinkedRole"
     ]
     resources = ["arn:${local.partition}:iam::*:role/aws-service-role/appmesh.${local.dns_suffix}/AWSServiceRoleForAppMesh"]
+
     condition {
       test     = "StringLike"
       variable = "iam:AWSServiceName"
@@ -1459,6 +1477,7 @@ data "aws_iam_policy_document" "vpc_cni" {
   # arn:${local.partition}:iam::aws:policy/AmazonEKS_CNI_Policy
   dynamic "statement" {
     for_each = var.vpc_cni_enable_ipv4 ? [1] : []
+
     content {
       sid = "IPV4"
       actions = [
@@ -1482,6 +1501,7 @@ data "aws_iam_policy_document" "vpc_cni" {
   # https://docs.aws.amazon.com/eks/latest/userguide/cni-iam-role.html#cni-iam-role-create-ipv6-policy
   dynamic "statement" {
     for_each = var.vpc_cni_enable_ipv6 ? [1] : []
+
     content {
       sid = "IPV6"
       actions = [
@@ -1498,6 +1518,7 @@ data "aws_iam_policy_document" "vpc_cni" {
   # https://docs.aws.amazon.com/eks/latest/userguide/cni-network-policy.html#cni-network-policy-setup
   dynamic "statement" {
     for_each = var.vpc_cni_enable_cloudwatch_logs ? [1] : []
+
     content {
       sid = "CloudWatchLogs"
       actions = [