Ensure log metric filter and alerts exist for Project Ownership assignments/changes

From Console

Create the prescribed log metric:

1. Go to Logging/Logs-based Metrics by visiting https://console.cloud.google.com/logs/metrics and click "CREATE METRIC".
2. Click the down arrow symbol on the Filter Bar at the rightmost corner and select Convert to Advanced Filter.
3. Clear any text and add:

(protoPayload.serviceName="cloudresourcemanager.googleapis.com")
AND (ProjectOwnership OR projectOwnerInvitee)
OR (protoPayload.serviceData.policyDelta.bindingDeltas.action="REMOVE"
AND protoPayload.serviceData.policyDelta.bindingDeltas.role="roles/owner") OR (protoPayload.serviceData.policyDelta.bindingDeltas.action="ADD"
AND protoPayload.serviceData.policyDelta.bindingDeltas.role="roles/owner")

1. Click Submit Filter. The logs display based on the filter text entered by the user.
2. In the Metric Editor menu on the right, fill out the name field. Set Units to 1(default) and the Type to Counter. This ensures that the log metric counts the number of log entries matching the advanced logs query.
3. Click Create Metric.

Create the display prescribed Alert Policy:

1. Identify the newly created metric under the section User-defined Metrics at https://console.cloud.google.com/logs/metrics.
2. Click the 3-dot icon in the rightmost column for the desired metric and select Create alert from Metric. A new page opens.
3. Fill out the alert policy configuration and click Save. Choose the alerting threshold and configuration that makes sense for the user's organization. For example, a threshold of zero (0) for the most recent value will ensure that a notification is triggered for every owner change in the project:

Set `Aggregator` to `Count`
Set `Configuration`:
- Condition: above
- Threshold: 0
- For: most recent value

1. Configure the desired notifications channels in the section Notifications.
2. Name the policy and click Save.

From Command Line

Create a prescribed Log Metric:

• Use the command: gcloud logging metrics create.
• Reference for Command Usage: https://docs.cloud.google.com/sdk/gcloud/reference/logging/metrics/create.

Create a prescribed Alert Policy:

• Use the command: gcloud monitoring policies create.
• Reference for Command Usage: https://docs.cloud.google.com/sdk/gcloud/reference/monitoring/policies/create.

Additional Information

1. Project ownership assignments for a user cannot be done using the gcloud utility as assigning project ownership to a user requires sending, and the user accepting, an invitation.
2. Project Ownership assignment to a service account does not send any invites. SetIAMPolicy to roles/owner is directly performed on service accounts.

Service-wide remediation

Recommended when many resources are affected: fix the platform baseline first so new resources inherit the secure setting, then remediate the existing flagged resources in batches.

Google Cloud

Use organization or folder policies where available, shared project templates, logs and alerting baselines, and IaC modules so new resources inherit the secure setting.

Operational rollout

1. Fix the baseline first at the account, subscription, project, cluster, or tenant scope that owns this control.
2. Remediate the currently affected resources in batches, starting with internet-exposed and production assets.
3. Re-scan and track approved exceptions with an owner and expiry date.