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Cloud Functions ingress is not set to internal-only traffic Affecting Cloud Functions service in Google

Severity

0.0
medium
0
10
Severity Framework
Snyk CCSS
Rule category
Network/ Access Control

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Frameworks
  • Snyk IDSNYK-CC-00808
  • creditSnyk Research Team
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Description

Allowing ingress from external sources can expose Cloud Functions to unauthorized access and potential attacks. Restricting ingress to internal traffic reduces the attack surface by ensuring that only traffic originating from within the cloud provider's network can reach the function. This mitigates risks associated with public endpoints and helps maintain a stronger security posture.

How to fix?

Set the ingress_settings attribute to ALLOW_INTERNAL_ONLY for the resource google_cloudfunctions_function.

Set the service_config[_].ingress_settings attribute to ALLOW_INTERNAL_ONLY for the resource google_cloudfunctions2_function.

Example Configuration

resource "google_cloudfunctions_function" "allow1" {
  name        = "function-test1"
  description = "My function"
  runtime     = "nodejs20"

  available_memory_mb   = 128
  source_archive_bucket = google_storage_bucket.bucket1.name
  source_archive_object = google_storage_bucket_object1.object.name
  trigger_http          = true
  entry_point           = "helloWorld"
  ingress_settings = "ALLOW_INTERNAL_ONLY"
}

resource "google_cloudfunctions2_function" "allow2" {
  name = "function-test2"
  location = "us-east1"
  description = "a new function"

  build_config {
    runtime = "nodejs20"
    entry_point = "helloHttp"
    source {
      storage_source {
        bucket = google_storage_bucket.bucket2.name
        object = google_storage_bucket_object.object2.name
      }
    }
  }
  service_config {
    max_instance_count  = 1
    available_memory    = "256M"
    ingress_settings = "ALLOW_INTERNAL_ONLY"
  }
}

References