VPC flow logs should be enabled for all subnetworks
Default Severity: low
Explanation
VPC flow logs record information about all traffic, which is a vital tool in reviewing anomalous traffic.
Possible Impact
Limited auditing capability and awareness
Suggested Resolution
Enable VPC flow logs
Insecure Example
The following example will fail the google-compute-enable-vpc-flow-logs check.
resource "google_compute_subnetwork" "bad_example" {
name = "test-subnetwork"
ip_cidr_range = "10.2.0.0/16"
region = "us-central1"
network = google_compute_network.custom-test.id
secondary_ip_range {
range_name = "tf-test-secondary-range-update1"
ip_cidr_range = "192.168.10.0/24"
}
}
resource "google_compute_network" "custom-test" {
name = "test-network"
auto_create_subnetworks = false
}
Secure Example
The following example will pass the google-compute-enable-vpc-flow-logs check.
resource "google_compute_subnetwork" "good_example" {
name = "test-subnetwork"
ip_cidr_range = "10.2.0.0/16"
region = "us-central1"
network = google_compute_network.custom-test.id
secondary_ip_range {
range_name = "tf-test-secondary-range-update1"
ip_cidr_range = "192.168.10.0/24"
}
log_config {
aggregation_interval = "INTERVAL_10_MIN"
flow_sampling = 0.5
metadata = "INCLUDE_ALL_METADATA"
}
}
resource "google_compute_network" "custom-test" {
name = "test-network"
auto_create_subnetworks = false
}