Implementing GCP Binary Authorization

# Enable required APIs
gcloud services enable binaryauthorization.googleapis.com
gcloud services enable containeranalysis.googleapis.com
gcloud services enable container.googleapis.com

# Enable Binary Authorization on GKE cluster
gcloud container clusters update CLUSTER_NAME \
  --enable-binauthz \
  --zone us-central1-a

# Create keyring
gcloud kms keyrings create binauthz-keyring \
  --location global

# Create signing key
gcloud kms keys create attestor-key \
  --keyring binauthz-keyring \
  --location global \
  --algorithm ec-sign-p256-sha256 \
  --purpose asymmetric-signing

cat > /tmp/note.json << 'EOF'
{
  "attestation": {
    "hint": {
      "humanReadableName": "Production Build Attestor"
    }
  }
}
EOF

curl -X POST \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $(gcloud auth print-access-token)" \
  "https://containeranalysis.googleapis.com/v1/projects/PROJECT_ID/notes/?noteId=prod-build-note" \
  -d @/tmp/note.json

gcloud container binauthz attestors create prod-build-attestor \
  --attestation-authority-note=prod-build-note \
  --attestation-authority-note-project=PROJECT_ID

# Add KMS key to attestor
gcloud container binauthz attestors public-keys add \
  --attestor=prod-build-attestor \
  --keyversion-project=PROJECT_ID \
  --keyversion-location=global \
  --keyversion-keyring=binauthz-keyring \
  --keyversion-key=attestor-key \
  --keyversion=1

# binauthz-policy.yaml
admissionWhitelistPatterns:
  - namePattern: "gcr.io/google_containers/*"
  - namePattern: "gcr.io/google-containers/*"
  - namePattern: "k8s.gcr.io/**"
  - namePattern: "gke.gcr.io/**"
  - namePattern: "gcr.io/stackdriver-agents/*"
defaultAdmissionRule:
  evaluationMode: REQUIRE_ATTESTATION
  enforcementMode: ENFORCED_BLOCK_AND_AUDIT_LOG
  requireAttestationsBy:
    - projects/PROJECT_ID/attestors/prod-build-attestor
globalPolicyEvaluationMode: ENABLE

gcloud container binauthz policy import binauthz-policy.yaml

admissionWhitelistPatterns:
  - namePattern: "gcr.io/google_containers/*"
clusterAdmissionRules:
  us-central1-a.production-cluster:
    evaluationMode: REQUIRE_ATTESTATION
    enforcementMode: ENFORCED_BLOCK_AND_AUDIT_LOG
    requireAttestationsBy:
      - projects/PROJECT_ID/attestors/prod-build-attestor
  us-central1-a.staging-cluster:
    evaluationMode: ALWAYS_ALLOW
    enforcementMode: DRYRUN_AUDIT_LOG_ONLY
defaultAdmissionRule:
  evaluationMode: ALWAYS_DENY
  enforcementMode: ENFORCED_BLOCK_AND_AUDIT_LOG

# Get image digest
IMAGE_DIGEST=$(gcloud container images describe \
  gcr.io/PROJECT_ID/my-app:latest \
  --format='get(image_summary.digest)')

# Create attestation
gcloud container binauthz attestations sign-and-create \
  --artifact-url="gcr.io/PROJECT_ID/my-app@${IMAGE_DIGEST}" \
  --attestor="prod-build-attestor" \
  --attestor-project="PROJECT_ID" \
  --keyversion-project="PROJECT_ID" \
  --keyversion-location="global" \
  --keyversion-keyring="binauthz-keyring" \
  --keyversion-key="attestor-key" \
  --keyversion="1"

# cloudbuild.yaml
steps:
  - name: 'gcr.io/cloud-builders/docker'
    args: ['build', '-t', 'gcr.io/$PROJECT_ID/my-app:$SHORT_SHA', '.']

  - name: 'gcr.io/cloud-builders/docker'
    args: ['push', 'gcr.io/$PROJECT_ID/my-app:$SHORT_SHA']

  # Vulnerability scanning
  - name: 'gcr.io/cloud-builders/gcloud'
    entrypoint: 'bash'
    args:
      - '-c'
      - |
        gcloud artifacts docker images scan \
          gcr.io/$PROJECT_ID/my-app:$SHORT_SHA \
          --format='value(response.scan)'

  # Create attestation after successful scan
  - name: 'gcr.io/cloud-builders/gcloud'
    entrypoint: 'bash'
    args:
      - '-c'
      - |
        IMAGE_DIGEST=$(gcloud container images describe \
          gcr.io/$PROJECT_ID/my-app:$SHORT_SHA \
          --format='get(image_summary.digest)')
        gcloud container binauthz attestations sign-and-create \
          --artifact-url="gcr.io/$PROJECT_ID/my-app@$${IMAGE_DIGEST}" \
          --attestor="prod-build-attestor" \
          --attestor-project="$PROJECT_ID" \
          --keyversion-project="$PROJECT_ID" \
          --keyversion-location="global" \
          --keyversion-keyring="binauthz-keyring" \
          --keyversion-key="attestor-key" \
          --keyversion="1"

# Enable CV on a GKE cluster
gcloud container clusters update CLUSTER_NAME \
  --enable-binauthz-monitoring \
  --zone us-central1-a

resource.type="k8s_cluster"
logName="projects/PROJECT_ID/logs/binaryauthorization.googleapis.com%2Fcontinuous_validation"

# This should be blocked
kubectl run test-unapproved \
  --image=docker.io/library/nginx:latest

# Verify the pod was denied
kubectl get events --field-selector reason=FailedCreate

gcloud container binauthz attestations list \
  --attestor=prod-build-attestor \
  --attestor-project=PROJECT_ID

apiVersion: v1
kind: Pod
metadata:
  name: emergency-pod
  labels:
    image-policy.k8s.io/break-glass: "true"
  annotations:
    alpha.image-policy.k8s.io/break-glass: "Emergency deployment - ticket INC-12345"
spec:
  containers:
    - name: emergency
      image: gcr.io/PROJECT_ID/emergency-fix:latest