terraform.gcp.security.gcp-memory-store-for-redis-intransit-encryption.gcp-memory-store-for-redis-intransit-encryption

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Ensure Memorystore for Redis uses intransit encryption

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Defintion

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rules:
  - id: gcp-memory-store-for-redis-intransit-encryption
    patterns:
      - pattern: |
          resource "google_redis_instance" $ANYTHING {
            ...
          }
      - pattern-not-inside: |
          resource "google_redis_instance" $ANYTHING {
            ...
            transit_encryption_mode = "SERVER_AUTHENTICATION"
            ...
          }
    message: Ensure Memorystore for Redis uses intransit encryption
    languages:
      - hcl
    severity: WARNING
    metadata:
      owasp:
        - A05:2017 - Broken Access Control
        - A01:2021 - Broken Access Control
      cwe:
        - "CWE-284: Improper Access Control"
      technology:
        - terraform
        - gcp
      category: security
      references:
        - https://owasp.org/Top10/A01_2021-Broken_Access_Control
      subcategory:
        - audit
      likelihood: LOW
      impact: LOW
      confidence: LOW
      license: Commons Clause License Condition v1.0[LGPL-2.1-only]
      vulnerability_class:
        - Improper Authorization

Examples

gcp-memory-store-for-redis-intransit-encryption.tf

# ok: gcp-memory-store-for-redis-intransit-encryption
resource "google_redis_instance" "pass" {
  provider       = google-beta
  name           = "mrr-memory-cache"
  tier           = "STANDARD_HA"
  memory_size_gb = 5

  location_id             = "us-central1-a"
  alternative_location_id = "us-central1-f"

  authorized_network = data.google_compute_network.redis-network.id

  redis_version      = "REDIS_6_X"
  display_name       = "Terraform Test Instance"
  reserved_ip_range  = "192.168.0.0/28"
  replica_count      = 5
  read_replicas_mode = "READ_REPLICAS_ENABLED"
  labels = {
    my_key    = "my_val"
    other_key = "other_val"
  }
  transit_encryption_mode = "SERVER_AUTHENTICATION"
}

# fail
# ruleid: gcp-memory-store-for-redis-intransit-encryption
resource "google_redis_instance" "fail" {
  provider       = google-beta
  name           = "mrr-memory-cache"
  tier           = "STANDARD_HA"
  memory_size_gb = 5

  location_id             = "us-central1-a"
  alternative_location_id = "us-central1-f"

  authorized_network = data.google_compute_network.redis-network.id

  redis_version      = "REDIS_6_X"
  display_name       = "Terraform Test Instance"
  reserved_ip_range  = "192.168.0.0/28"
  replica_count      = 5
  read_replicas_mode = "READ_REPLICAS_ENABLED"
  labels = {
    my_key    = "my_val"
    other_key = "other_val"
  }
}

# fail
# ruleid: gcp-memory-store-for-redis-intransit-encryption
resource "google_redis_instance" "fail2" {
  provider       = google-beta
  name           = "mrr-memory-cache"
  tier           = "STANDARD_HA"
  memory_size_gb = 5

  location_id             = "us-central1-a"
  alternative_location_id = "us-central1-f"

  authorized_network = data.google_compute_network.redis-network.id

  redis_version      = "REDIS_6_X"
  display_name       = "Terraform Test Instance"
  reserved_ip_range  = "192.168.0.0/28"
  replica_count      = 5
  read_replicas_mode = "READ_REPLICAS_ENABLED"
  labels = {
    my_key    = "my_val"
    other_key = "other_val"
  }
     transit_encryption_mode = "DISABLED"
}