no-legacy-auth
Explanation
Client certificates are the most secure and recommended method of authentication.
Possible Impact
Less secure authentication method in use
Suggested Resolution
Use client certificates for authentication
Insecure Example
The following example will fail the google-gke-no-legacy-auth check.
resource "google_service_account" "default" {
account_id = "service-account-id"
display_name = "Service Account"
}
resource "google_container_cluster" "good_example" {
name = "my-gke-cluster"
location = "us-central1"
# We can't create a cluster with no node pool defined, but we want to only use
# separately managed node pools. So we create the smallest possible default
# node pool and immediately delete it.
remove_default_node_pool = true
initial_node_count = 1
master_auth {
client_certificate_config {
issue_client_certificate = true
}
}
}
resource "google_container_node_pool" "primary_preemptible_nodes" {
name = "my-node-pool"
location = "us-central1"
cluster = google_container_cluster.primary.name
node_count = 1
node_config {
preemptible = true
machine_type = "e2-medium"
# Google recommends custom service accounts that have cloud-platform scope and permissions granted via IAM Roles.
service_account = google_service_account.default.email
oauth_scopes = [
"https://www.googleapis.com/auth/cloud-platform"
]
}
}
Secure Example
The following example will pass the google-gke-no-legacy-auth check.
resource "google_service_account" "default" {
account_id = "service-account-id"
display_name = "Service Account"
}
resource "google_container_cluster" "good_example" {
name = "my-gke-cluster"
location = "us-central1"
# We can't create a cluster with no node pool defined, but we want to only use
# separately managed node pools. So we create the smallest possible default
# node pool and immediately delete it.
remove_default_node_pool = true
initial_node_count = 1
}
resource "google_container_node_pool" "primary_preemptible_nodes" {
name = "my-node-pool"
location = "us-central1"
cluster = google_container_cluster.primary.name
node_count = 1
node_config {
preemptible = true
machine_type = "e2-medium"
# Google recommends custom service accounts that have cloud-platform scope and permissions granted via IAM Roles.
service_account = google_service_account.default.email
oauth_scopes = [
"https://www.googleapis.com/auth/cloud-platform"
]
}
}