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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
76 lines
1.9 KiB
Markdown
76 lines
1.9 KiB
Markdown
# API Reference: Implementing Image Provenance Verification with Cosign
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## Cosign CLI Commands
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```bash
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# Sign image (keyless with OIDC)
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cosign sign --yes IMAGE_REF
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# Sign with key
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cosign sign --key cosign.key IMAGE_REF
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# Verify (keyless)
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cosign verify --certificate-identity USER --certificate-oidc-issuer ISSUER IMAGE_REF
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# Verify with key
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cosign verify --key cosign.pub IMAGE_REF
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# Attach attestation
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cosign attest --predicate sbom.json --type spdxjson IMAGE_REF
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# Verify attestation
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cosign verify-attestation --type spdxjson IMAGE_REF
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# Get signature location
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cosign triangulate IMAGE_REF
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```
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## Sigstore Components
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| Component | Purpose |
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|-----------|---------|
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| Cosign | Sign and verify images |
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| Fulcio | Short-lived certificate authority |
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| Rekor | Transparency log |
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| policy-controller | Kubernetes admission |
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## Attestation Types
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| Type | Predicate | Use Case |
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|------|-----------|----------|
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| `custom` | Custom JSON | General |
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| `spdxjson` | SPDX SBOM | Software bill of materials |
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| `cyclonedxjson` | CycloneDX SBOM | Alt SBOM format |
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| `slsaprovenance` | SLSA Provenance | Build provenance |
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| `vuln` | Vulnerability scan | Scan results |
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## Kyverno Policy (Kubernetes Admission)
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```yaml
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apiVersion: kyverno.io/v1
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kind: ClusterPolicy
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metadata:
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name: verify-images
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spec:
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validationFailureAction: Enforce
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rules:
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- name: verify-cosign
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match:
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any:
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- resources: { kinds: [Pod] }
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verifyImages:
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- imageReferences: ["ghcr.io/org/*"]
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attestors:
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- entries:
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- keyless:
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subject: "*@org.com"
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issuer: "https://token.actions.githubusercontent.com"
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```
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### References
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- Sigstore: https://sigstore.dev/
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- Cosign Docs: https://docs.sigstore.dev/cosign/signing/overview/
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- SLSA Framework: https://slsa.dev/
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- Kyverno Image Verification: https://kyverno.io/docs/writing-policies/verify-images/
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