terraform.gcp.best-practice.gcp-compute-shielded-vm.gcp-compute-shielded-vm

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Ensure Compute instances are launched with Shielded VM enabled

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Defintion

rules:
  - id: gcp-compute-shielded-vm
    patterns:
      - pattern: resource
      - pattern-either:
          - pattern-inside: |
              resource "google_compute_instance" "..." {
              ...
              }
          - pattern-inside: |
              resource "google_compute_instance" "..." {
              ...
              shielded_instance_config {
                ...
                enable_integrity_monitoring = false
                ...
              }
              ...
              }
      - pattern-not-inside: |
          resource "google_compute_instance" "..." {
          ...
          shielded_instance_config {
            ...
            enable_integrity_monitoring = true
            ...
          }
          ...
          }
    message: Ensure Compute instances are launched with Shielded VM enabled
    metadata:
      category: best-practice
      technology:
        - terraform
        - gcp
      references:
        - https://docs.bridgecrew.io/docs/google-cloud-policy-index
      license: Commons Clause License Condition v1.0[LGPL-2.1-only]
    languages:
      - hcl
    severity: WARNING

Examples

gcp-compute-shielded-vm.tf

# fail
# ruleid: gcp-compute-shielded-vm
resource "google_compute_instance" "fail1" {
    name         = "test"
    machine_type = "n1-standard-1"
    zone         = "us-central1-a"
    boot_disk {}
}

# fail
# ruleid: gcp-compute-shielded-vm
resource "google_compute_instance" "fail2" {
    name         = "test"
    machine_type = "n1-standard-1"
    zone         = "us-central1-a"
    boot_disk {}
    shielded_instance_config {
        enable_integrity_monitoring = false
    }
}

# ok: gcp-compute-shielded-vm
resource "google_compute_instance" "success" {
    name         = "test"
    machine_type = "n1-standard-1"
    zone         = "us-central1-a"
    boot_disk {}
    shielded_instance_config {
        enable_vtpm = true
        enable_integrity_monitoring = true
    }
}