terraform.gcp.security.gcp-bigtable-instance-encrypted-with-cmk.gcp-bigtable-instance-encrypted-with-cmk

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Ensure Big Table Instances are encrypted with Customer Supplied Encryption Keys (CSEK)

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Defintion

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rules:
  - id: gcp-bigtable-instance-encrypted-with-cmk
    patterns:
      - pattern: |
          resource "google_bigtable_instance" $ANYTHING {
            ...
          }
      - pattern-not-inside: |
          resource "google_bigtable_instance" $ANYTHING {
            ...
            cluster {
              ...
              kms_key_name = ...
              ...
            }
            ...
          }
    message: "Ensure Big Table Instances are encrypted with Customer Supplied
      Encryption Keys (CSEK)\t"
    metadata:
      category: security
      technology:
        - terraform
        - gcp
      owasp:
        - A03:2017 - Sensitive Data Exposure
      cwe:
        - "CWE-320: CWE CATEGORY: Key Management Errors"
      references:
        - https://docs.bridgecrew.io/docs/google-cloud-policy-index
      subcategory:
        - audit
      likelihood: LOW
      impact: LOW
      confidence: LOW
      license: Commons Clause License Condition v1.0[LGPL-2.1-only]
      vulnerability_class:
        - Cryptographic Issues
    languages:
      - hcl
    severity: WARNING

Examples

gcp-bigtable-instance-encrypted-with-cmk.tf

# fail
# ruleid: gcp-bigtable-instance-encrypted-with-cmk
resource "google_bigtable_instance" "fail" {
  name = "tf-instance"

  cluster {
    cluster_id   = "tf-instance-cluster"
    num_nodes    = 1
    storage_type = "HDD"
    # kms_key_name = "some value"
  }

  labels = {
    my-label = "prod-label"
  }
}

# ok: gcp-bigtable-instance-encrypted-with-cmk
resource "google_bigtable_instance" "pass" {
  name = "tf-instance"

  cluster {
    cluster_id   = "tf-instance-cluster"
    num_nodes    = 1
    storage_type = "HDD"
    kms_key_name = google_kms_crypto_key.example.name
  }

  labels = {
    my-label = "prod-label"
  }
}