terraform.gcp.security.gcp-project-service-account-user-iam-binding.gcp-project-service-account-user-iam-binding

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Ensure that IAM users are not assigned the Service Account User or Service Account Token Creator roles at project level

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Defintion

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rules:
  - id: gcp-project-service-account-user-iam-binding
    patterns:
      - pattern: resource
      - pattern-either:
          - pattern-inside: |
              resource "google_project_iam_binding" "..." {
              ...
              role = "roles/iam.serviceAccountTokenCreator"
              ...
              }
          - pattern-inside: |
              resource "google_project_iam_binding" "..." {
              ...
              role = "roles/iam.serviceAccountUser"
              ...
              }
    message: Ensure that IAM users are not assigned the Service Account User or
      Service Account Token Creator roles at project level
    metadata:
      owasp:
        - A05:2017 - Broken Access Control
        - A01:2021 - Broken Access Control
      cwe:
        - "CWE-284: Improper Access Control"
      category: security
      technology:
        - terraform
        - gcp
      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
    languages:
      - hcl
    severity: WARNING

Examples

gcp-project-service-account-user-iam-binding.tf

# fail
# ruleid: gcp-project-service-account-user-iam-binding
resource "google_project_iam_binding" "fail1" {
    project = "your-project-id"
    role    = "roles/iam.serviceAccountTokenCreator"

    members = [
    "user:jane@example.com",
    ]
}

# fail
# ruleid: gcp-project-service-account-user-iam-binding
resource "google_project_iam_binding" "fail2" {
    project = "your-project-id"
    role    = "roles/iam.serviceAccountUser"

    members = [
    "user:jane@example.com",
    ]
}

# ok: gcp-project-service-account-user-iam-binding
resource "google_project_iam_binding" "success" {
    project = "your-project-id"
    role    = "roles/editor"
    
    members = [
    "user:jane@example.com",
    ]
}