Cloud Storage bucket is publicly accessible

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Metadata

Id: terraform-gcp-cloud-storage-bucket-is-publicly-accessible

Provider: GCP

Platform: Terraform

Severity: Medium

Category: Access Control

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Description

Granting public or anonymous access to a Google Cloud Storage bucket using Terraform, such as by setting the member to allUsers (anyone on the internet) or allAuthenticatedUsers (any authenticated Google account) in a google_storage_bucket_iam_member resource, exposes your data to unauthorized access. This can lead to data leaks, theft, or manipulation since anyone could potentially view, download, modify, or delete sensitive data. To prevent this, IAM bindings for storage buckets should only specify trusted user or service accounts, as shown below:

resource "google_storage_bucket_iam_member" "secure_example" {
  bucket = google_storage_bucket.default.name
  role   = "roles/storage.admin"
  member = "user:jane@example.com"
}

Compliant Code Examples

resource "google_storage_bucket_iam_member" "negative1" {
  bucket = google_storage_bucket.default.name
  role = "roles/storage.admin"
  member = "user:jane@example.com"
}


resource "google_storage_bucket_iam_member" "negative2" {
  bucket = google_storage_bucket.default.name
  role = "roles/storage.admin"
  members = ["user:john@example.com","user:john@example.com"]
}

Non-Compliant Code Examples

resource "google_storage_bucket_iam_member" "positive1" {
  bucket = google_storage_bucket.default.name
  role = "roles/storage.admin"
  member = "allUsers"

  condition {
    title       = "expires_after_2019_12_31"
    description = "Expiring at midnight of 2019-12-31"
    expression  = "request.time < timestamp(\"2020-01-01T00:00:00Z\")"
  }
}


resource "google_storage_bucket_iam_member" "positive2" {
  bucket = google_storage_bucket.default.name
  role = "roles/storage.admin"
  members = ["user:john@example.com","allAuthenticatedUsers"]
}