feat: Add support for autokey in postgres module (#712)

Co-authored-by: Imran Nayer <[email protected]>

Author: ps-occrp

examples/postgresql-ha/README.md

@@ -23,6 +23,8 @@ terraform destroy
 
 | Name | Description | Type | Default | Required |
 |------|-------------|------|---------|:--------:|
+| folder\_id | The folder where project is created | `string` | n/a | yes |
+| key\_project\_id | The project where autokey is setup | `string` | n/a | yes |
 | pg\_ha\_external\_ip\_range | The ip range to allow connecting from/to Cloud SQL | `string` | `"192.10.10.10/32"` | no |
 | pg\_ha\_name | The name for Cloud SQL instance | `string` | `"tf-pg-ha"` | no |
 | project\_id | The project to run tests against | `string` | n/a | yes |

examples/postgresql-ha/main.tf

@@ -48,6 +48,7 @@ module "pg" {
   maintenance_window_hour         = 12
   maintenance_window_update_track = "stable"
 
+  use_autokey         = true
   deletion_protection = false
 
   database_flags = [{ name = "autovacuum", value = "off" }]
@@ -127,4 +128,16 @@ module "pg" {
       random_password = false
     },
   ]
+  depends_on = [time_sleep.wait_autokey_config]
+}
+
+resource "google_kms_autokey_config" "autokey_config" {
+  provider    = google-beta
+  folder      = var.folder_id
+  key_project = "projects/${var.key_project_id}"
+}
+
+resource "time_sleep" "wait_autokey_config" {
+  create_duration = "10s"
+  depends_on      = [google_kms_autokey_config.autokey_config]
 }

examples/postgresql-ha/outputs.tf

@@ -28,9 +28,11 @@ output "authorized_network" {
 }
 
 output "replicas" {
-  value = module.pg.replicas
+  value     = module.pg.replicas
+  sensitive = true
 }
 
 output "instances" {
-  value = module.pg.instances
+  value     = module.pg.instances
+  sensitive = true
 }

examples/postgresql-ha/variables.tf

@@ -30,3 +30,13 @@ variable "pg_ha_external_ip_range" {
   description = "The ip range to allow connecting from/to Cloud SQL"
   default     = "192.10.10.10/32"
 }
+
+variable "key_project_id" {
+  type        = string
+  description = "The project where autokey is setup"
+}
+
+variable "folder_id" {
+  type        = string
+  description = "The folder where project is created"
+}

modules/postgresql/README.md

@@ -170,6 +170,7 @@ module "pg" {
 | secondary\_zone | The preferred zone for the replica instance, it should be something like: `us-central1-a`, `us-east1-c`. | `string` | `null` | no |
 | tier | The tier for the Cloud SQL instance. | `string` | `"db-f1-micro"` | no |
 | update\_timeout | The optional timout that is applied to limit long database updates. | `string` | `"30m"` | no |
+| use\_autokey | Enable the use of autokeys from Google Cloud KMS for CMEK. This requires autokey already configured in the project. | `bool` | `false` | no |
 | user\_deletion\_policy | The deletion policy for the user. Setting ABANDON allows the resource to be abandoned rather than deleted. This is useful for Postgres, where users cannot be deleted from the API if they have been granted SQL roles. Possible values are: "ABANDON". | `string` | `null` | no |
 | user\_labels | The key/value labels for the Cloud SQL instances. | `map(string)` | `{}` | no |
 | user\_name | The name of the default user | `string` | `"default"` | no |

modules/postgresql/main.tf

@@ -45,6 +45,8 @@ locals {
   connector_enforcement = var.connector_enforcement ? "REQUIRED" : "NOT_REQUIRED"
 
   database_name = var.enable_default_db ? var.db_name : (length(var.additional_databases) > 0 ? var.additional_databases[0].name : "")
+
+  encryption_key = var.encryption_key_name != null ? var.encryption_key_name : var.use_autokey ? google_kms_key_handle.default[0].kms_key : null
 }
 
 resource "random_id" "suffix" {
@@ -60,7 +62,7 @@ resource "google_sql_database_instance" "default" {
   database_version    = can(regex("\\d", substr(var.database_version, 0, 1))) ? format("POSTGRES_%s", var.database_version) : replace(var.database_version, substr(var.database_version, 0, 8), "POSTGRES")
   maintenance_version = var.maintenance_version
   region              = var.region
-  encryption_key_name = var.encryption_key_name
+  encryption_key_name = local.encryption_key
   deletion_protection = var.deletion_protection
   root_password       = var.root_password
 
@@ -211,6 +213,15 @@ resource "google_sql_database_instance" "default" {
   depends_on = [null_resource.module_depends_on]
 }
 
+resource "google_kms_key_handle" "default" {
+  count                  = var.use_autokey ? 1 : 0
+  provider               = google-beta
+  project                = var.project_id
+  name                   = local.instance_name
+  location               = coalesce(var.region, join("-", slice(split("-", var.zone), 0, 2)))
+  resource_type_selector = "sqladmin.googleapis.com/Instance"
+}
+
 resource "google_sql_database" "default" {
   count           = var.enable_default_db ? 1 : 0
   name            = var.db_name

modules/postgresql/variables.tf

@@ -456,3 +456,9 @@ variable "database_integration_roles" {
   type        = list(string)
   default     = []
 }
+
+variable "use_autokey" {
+  description = "Enable the use of autokeys from Google Cloud KMS for CMEK. This requires autokey already configured in the project."
+  type        = bool
+  default     = false
+}

test/fixtures/postgresql-ha/main.tf

@@ -32,7 +32,6 @@ module "example" {
   project_id              = var.project_id
   pg_ha_name              = var.pg_ha_name
   pg_ha_external_ip_range = var.pg_ha_external_ip_range
+  key_project_id          = var.key_project_id
+  folder_id               = var.folder_id
 }
-
-
-

test/fixtures/postgresql-ha/variables.tf

@@ -30,3 +30,13 @@ variable "pg_ha_external_ip_range" {
   description = "The ip range to allow connecting from/to Cloud SQL"
   default     = "192.10.10.10/32"
 }
+
+variable "key_project_id" {
+  type        = string
+  description = "The project where autokey is setup"
+}
+
+variable "folder_id" {
+  type        = string
+  description = "The folder where project is created"
+}

test/setup/iam.tf

@@ -17,6 +17,7 @@
 locals {
   int_required_roles = [
     "roles/cloudkms.admin",
+    "roles/cloudkms.autokeyAdmin",
     "roles/cloudkms.cryptoKeyEncrypterDecrypter",
     "roles/cloudscheduler.admin",
     "roles/cloudsql.admin",
@@ -45,6 +46,15 @@ resource "google_project_iam_member" "int_test" {
   member  = "serviceAccount:${google_service_account.int_test.email}"
 }
 
+resource "google_folder_iam_member" "int_test" {
+  count = length(local.int_required_roles)
+
+  folder = google_folder.autokey_folder.folder_id
+  role   = local.int_required_roles[count.index]
+  member = "serviceAccount:${google_service_account.int_test.email}"
+}
+
+
 resource "google_service_account_key" "int_test" {
   service_account_id = google_service_account.int_test.id
 }