49 lines
2.3 KiB
Markdown
49 lines
2.3 KiB
Markdown
# Time Anchor Trust Roots (draft) — for AIRGAP-TIME-57-001
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Provides a minimal, deterministic format for distributing trust roots used to validate time tokens (Roughtime and RFC3161) in sealed/offline environments.
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## Artefacts
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- JSON schema: `docs/airgap/time-anchor-schema.json`
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- Trust roots bundle (draft): `docs/airgap/time-anchor-trust-roots.json`
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## Bundle format (`time-anchor-trust-roots.json`)
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```json
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{
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"version": 1,
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"roughtime": [
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{
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"name": "stellaops-test-roughtime",
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"publicKeyBase64": "BASE64_ED25519_PUBLIC_KEY",
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"validFrom": "2025-01-01T00:00:00Z",
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"validTo": "2026-01-01T00:00:00Z"
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}
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],
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"rfc3161": [
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{
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"name": "stellaops-test-tsa",
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"certificatePem": "-----BEGIN CERTIFICATE-----...-----END CERTIFICATE-----",
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"validFrom": "2025-01-01T00:00:00Z",
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"validTo": "2026-01-01T00:00:00Z",
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"fingerprintSha256": "HEX_SHA256"
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}
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]
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}
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```
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- All times are UTC ISO-8601.
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- Fields are deterministic; no optional properties other than multiple entries per list.
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- Consumers must reject expired roots and enforce matching token format (Roughtime vs RFC3161).
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## Usage guidance
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- Ship the bundle with the air-gapped deployment alongside the time-anchor schema.
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- Configure AirGap Time service to load roots from a sealed path; do not fetch over network.
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- Rotate by bumping `version`, adding new entries, and setting `validFrom/validTo`; keep prior roots until all deployments roll.
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## Next steps
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- Replace placeholder values with production Roughtime public keys and TSA certificates once issued by Security.
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- Add regression tests in `StellaOps.AirGap.Time.Tests` that load this bundle and validate sample tokens once real roots are present.
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- CI/Dev unblock: you can test end-to-end with a throwaway root by:
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1. Generate Ed25519 key for Roughtime: `openssl genpkey -algorithm Ed25519 -out rtime-dev.pem && openssl pkey -in rtime-dev.pem -pubout -out rtime-dev.pub`.
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2. Base64-encode the public key (`base64 -w0 rtime-dev.pub`) and place into `publicKeyBase64`; set validity to a short window.
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3. Point `AirGap:TrustRootFile` at your edited bundle and set `AirGap:AllowUntrustedAnchors=true` only in dev.
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4. Run `scripts/mirror/verify_thin_bundle.py --time-root docs/airgap/time-anchor-trust-roots.json` to ensure bundle is parsable.
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