Google Compute subnetwork logging disabled

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Metadata

Id: terraform-gcp-google-compute-subnetwork-logging-disabled

Provider: GCP

Platform: Terraform

Severity: Medium

Category: Observability

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Description

This check verifies whether VPC flow logs are enabled for a google_compute_subnetwork resource by ensuring a log_config block is included in the Terraform configuration. Without flow logs enabled, as shown below, critical network traffic information is not captured, making it difficult to monitor, detect, or investigate suspicious activity within the network.

resource "google_compute_subnetwork" "example" {
  // ...subnetwork configuration...

  log_config {
    aggregation_interval = "INTERVAL_10_MIN"
    flow_sampling        = 0.5
    metadata             = "INCLUDE_ALL_METADATA"
  }
}

Failure to enable logging can lead to security gaps, reducing visibility into potential breaches and making compliance with auditing requirements more challenging.

Compliant Code Examples

resource "google_compute_subnetwork" "negative1" {
  name          = "log-test-subnetwork"
  ip_cidr_range = "10.2.0.0/16"
  region        = "us-central1"
  network       = google_compute_network.custom-test.id

  log_config {
    aggregation_interval = "INTERVAL_10_MIN"
    flow_sampling        = 0.5
    metadata             = "INCLUDE_ALL_METADATA"
  }
}

Non-Compliant Code Examples

resource "google_compute_subnetwork" "positive1" {
  name          = "log-test-subnetwork"
  ip_cidr_range = "10.2.0.0/16"
  region        = "us-central1"
  network       = google_compute_network.custom-test.id
}