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- Add scripts/agent.py and references/api-reference.md to all remaining skills - Update all 648 LICENSE files: copyright now reads 'Mahipal' - Add implementing-security-monitoring-with-datadog (new skill with full anatomy) - All 649 skills now have: SKILL.md, LICENSE, scripts/agent.py, references/api-reference.md
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API Reference: Implementing Image Provenance Verification with Cosign
Cosign CLI Commands
# Sign image (keyless with OIDC)
cosign sign --yes IMAGE_REF
# Sign with key
cosign sign --key cosign.key IMAGE_REF
# Verify (keyless)
cosign verify --certificate-identity USER --certificate-oidc-issuer ISSUER IMAGE_REF
# Verify with key
cosign verify --key cosign.pub IMAGE_REF
# Attach attestation
cosign attest --predicate sbom.json --type spdxjson IMAGE_REF
# Verify attestation
cosign verify-attestation --type spdxjson IMAGE_REF
# Get signature location
cosign triangulate IMAGE_REF
Sigstore Components
| Component | Purpose |
|---|---|
| Cosign | Sign and verify images |
| Fulcio | Short-lived certificate authority |
| Rekor | Transparency log |
| policy-controller | Kubernetes admission |
Attestation Types
| Type | Predicate | Use Case |
|---|---|---|
custom |
Custom JSON | General |
spdxjson |
SPDX SBOM | Software bill of materials |
cyclonedxjson |
CycloneDX SBOM | Alt SBOM format |
slsaprovenance |
SLSA Provenance | Build provenance |
vuln |
Vulnerability scan | Scan results |
Kyverno Policy (Kubernetes Admission)
apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
name: verify-images
spec:
validationFailureAction: Enforce
rules:
- name: verify-cosign
match:
any:
- resources: { kinds: [Pod] }
verifyImages:
- imageReferences: ["ghcr.io/org/*"]
attestors:
- entries:
- keyless:
subject: "*@org.com"
issuer: "https://token.actions.githubusercontent.com"
References
- Sigstore: https://sigstore.dev/
- Cosign Docs: https://docs.sigstore.dev/cosign/signing/overview/
- SLSA Framework: https://slsa.dev/
- Kyverno Image Verification: https://kyverno.io/docs/writing-policies/verify-images/