terraform.gcp.security.gcp-spanner-database-encrypted-with-cmk.gcp-spanner-database-encrypted-with-cmk

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Ensure Spanner Database is encrypted with Customer Supplied Encryption Keys (CSEK)

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Defintion

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rules:
  - id: gcp-spanner-database-encrypted-with-cmk
    patterns:
      - pattern: |
          resource "google_spanner_database" $ANYTHING {
            ...
          }
      - pattern-not-inside: |
          resource "google_spanner_database" $ANYTHING {
            ...
            encryption_config {
              ...
              kms_key_name = ...
              ...
            }
            ...
          }
    message: Ensure Spanner Database is encrypted with Customer Supplied Encryption
      Keys (CSEK)
    metadata:
      category: security
      technology:
        - terraform
        - gcp
      owasp:
        - A03:2017 - Sensitive Data Exposure
      cwe:
        - "CWE-320: CWE CATEGORY: Key Management Errors"
      references:
        - https://owasp.org/Top10/A02_2021-Cryptographic_Failures
      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-spanner-database-encrypted-with-cmk.tf

# fail
# ruleid: gcp-spanner-database-encrypted-with-cmk
resource "google_spanner_database" "fail" {
  instance = google_spanner_instance.example.name
  name     = "my-database"
  ddl = [
    "CREATE TABLE t1 (t1 INT64 NOT NULL,) PRIMARY KEY(t1)",
    "CREATE TABLE t2 (t2 INT64 NOT NULL,) PRIMARY KEY(t2)",
  ]
  deletion_protection = false
}

# ok: gcp-spanner-database-encrypted-with-cmk
resource "google_spanner_database" "pass" {
  instance = google_spanner_instance.example.name
  name     = "my-database"
  ddl = [
    "CREATE TABLE t1 (t1 INT64 NOT NULL,) PRIMARY KEY(t1)",
    "CREATE TABLE t2 (t2 INT64 NOT NULL,) PRIMARY KEY(t2)",
  ]
  deletion_protection = false
  encryption_config {
      kms_key_name = google_kms_crypto_key.example.name
  }
}