| name | implementing-gcp-organization-policy-constraints |
| description | Implements GCP Organization Policy constraints via gcloud and Terraform, such as restricting external IPs, resource locations, default service accounts, and service account keys, plus dry-run testing of policy impact before enforcement. Use when enforcing security guardrails across an org's resource hierarchy, or hardening GCP config at the org, folder, or project level. |
| domain | cybersecurity |
| subdomain | cloud-security |
| tags | ["gcp","organization-policy","constraints","governance","compliance","cloud-security","resource-manager"] |
| version | 1.0 |
| author | mahipal |
| license | Apache-2.0 |
| nist_csf | ["PR.IR-01","ID.AM-08","GV.SC-06","DE.CM-01"] |
| mitre_attack | ["T1078.004","T1530","T1537","T1580"] |
Implementing GCP Organization Policy Constraints
Overview
The GCP Organization Policy Service provides centralized and programmatic control over cloud resources. Organization policies configure constraints that restrict one or more Google Cloud services, enforced at organization, folder, or project levels. They improve security by blocking external IPs, requiring encryption, and minimizing unauthorized access. Changes can take up to 15 minutes to propagate.
When to Use
- When deploying or configuring implementing gcp organization policy constraints capabilities in your environment
- When establishing security controls aligned to compliance requirements
- When building or improving security architecture for this domain
- When conducting security assessments that require this implementation
Prerequisites
- GCP Organization with Organization Administrator role
gcloud CLI configured and authenticated- Terraform or gcloud for policy management
- Organization Policy Administrator IAM role (
roles/orgpolicy.policyAdmin)
Core Concepts
Constraint Types
- List Constraints: Allow or deny specific values (e.g., allowed regions)
- Boolean Constraints: Enable or disable a capability (e.g., disable serial port access)
- Custom Constraints: User-defined rules targeting specific resource fields (Preview)
Policy Inheritance
Policies inherit from the lowest ancestor with an enforced policy. If no ancestor has a policy, Google's managed default behavior applies.
Essential Security Constraints
Restrict VM External IP Addresses
gcloud resource-manager org-policies set-policy \
--organization=ORGANIZATION_ID \
policy.yaml
policy.yaml:
constraint: constraints/compute.vmExternalIpAccess
listPolicy:
allValues: DENY
Restrict Resource Locations
gcloud org-policies set-policy \
--organization=ORGANIZATION_ID \
location-policy.yaml
location-policy.yaml:
constraint:
