gcloud-iam-admin-roles: IAM Users with Administrative Roles

id: gcloud-iam-admin-roles

info:
  name: IAM Users with Administrative Roles
  author: princechaddha
  severity: medium
  description: |
    Ensure that IAM roles with privileged administrative permissions are not assigned to IAM identities (users, groups, and service accounts) to promote least privilege and provide your members (principals) the minimal access required to perform their tasks. When IAM members have administrator privileges (Owner and Editor roles, or roles containing "Admin" or "admin" in their names), they can access, create, and manage cloud resources.
  impact: |
    Administrative roles grant excessive permissions that violate the principle of least privilege, potentially allowing users to perform unauthorized or accidental changes across resources.
  remediation: |
    Remove administrative roles (Owner, Editor, and roles containing "Admin" or "admin") from IAM members and replace them with more granular roles that follow the principle of least privilege.
  reference:
    - https://www.trendmicro.com/cloudoneconformity/knowledge-base/gcp/IAM/roles-with-admin-permissions.html
    - https://cloud.google.com/iam/docs/understanding-roles
  tags: cloud,devops,gcp,gcloud,iam,security,admin,permissions,gcp-cloud-config

flow: |
  code(1)
  for(let projectId of iterate(template.projectIds)){
    set("projectId", projectId)
    code(2)
  }

self-contained: true

code:
  - engine:
      - sh
      - bash
    source: |
      gcloud projects list --format="json(projectId)"

    extractors:
      - type: json
        name: projectIds
        internal: true
        json:
          - '.[].projectId'

  - engine:
      - sh
      - bash
    source: |
      gcloud projects get-iam-policy $projectId --format="json(bindings[?(@.role=='roles/owner' || @.role=='roles/editor' || @.role contains 'admin' || @.role contains 'Admin')])"

    matchers:
      - type: word
        words:
          - '"role":'

    extractors:
      - type: dsl
        dsl:
          - '"Project " + projectId + " has IAM users with administrative roles that grant excessive permissions"'
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