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54 lines
3.7 KiB
Markdown
54 lines
3.7 KiB
Markdown
# StellaOps Signer
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Signer validates callers, enforces Proof-of-Entitlement, and produces signed DSSE bundles for SBOMs, reports, and exports.
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## Latest updates (Sprint 0186/0401 · 2025-11-26)
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- **CryptoDsseSigner** implemented with ICryptoProviderRegistry integration (SIGN-CORE-186-004), enabling keyless + KMS signing modes with cosign-compatible DSSE output.
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- **SignerStatementBuilder** refactored to support StellaOps predicate types (`stella.ops/promotion@v1`, `stella.ops/sbom@v1`, `stella.ops/vex@v1`, etc.) with CanonicalJson canonicalization (SIGN-CORE-186-005).
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- **PredicateTypes catalog** extended with `stella.ops/vexDecision@v1` and `stella.ops/graph@v1` for reachability evidence chain (SIGN-VEX-401-018).
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- **Helper methods** added: `IsVexRelatedType`, `IsReachabilityRelatedType`, `GetAllowedPredicateTypes`, `IsAllowedPredicateType` for predicate type validation.
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- **Integration tests** upgraded with real crypto abstraction, fixture predicates (promotion, SBOM, VEX, replay, policy, evidence, graph), and deterministic test data (SIGN-TEST-186-006). All 102 Signer tests passing.
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## Previous updates (Sprint 11 · 2025-10-21)
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- `/sign/dsse` pipeline landed with Authority OpTok + PoE enforcement, Fulcio/KMS signing modes, and deterministic DSSE bundles ready for Attestor logging.
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- `/verify/referrers` endpoint exposes release-integrity checks against scanner OCI referrers so callers can confirm digests before requesting signatures.
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- Plan quota enforcement (QPS/concurrency/artifact size) and audit/metrics wiring now align with the Sprint 11 signing-chain release.
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## Responsibilities
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- Enforce Proof-of-Entitlement and plan quotas before signing artifacts.
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- Support keyless (Fulcio) and keyful (KMS/HSM) signing backends.
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- Verify scanner release integrity via OCI referrers prior to issuing signatures.
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- Emit DSSE payloads consumed by Attestor/Export Center and maintain comprehensive audit trails.
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## Key components
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- `StellaOps.Signer` service host with `SignerPipeline` orchestrating the signing flow.
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- `CryptoDsseSigner` for ES256 signature generation via `ICryptoProviderRegistry`.
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- `SignerStatementBuilder` for in-toto statement creation with `PredicateTypes` catalog.
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- `DefaultSigningKeyResolver` for tenant-aware key resolution (keyless/KMS modes).
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- Crypto providers under `StellaOps.Cryptography.*`.
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## Integrations & dependencies
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- Authority for OpTok + PoE validation.
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- Licensing Service for entitlement introspection.
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- OCI registries (Referrers API) for scanner release verification.
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- Attestor for transparency logging and Rekor ingestion.
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- Export Center and CLI for artifact signing flows.
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## API quick reference
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- `POST /api/v1/signer/sign/dsse` — validate OpTok/PoE, enforce quotas, return DSSE bundle with signing identity metadata.
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- `GET /api/v1/signer/verify/referrers` — report scanner release signer and trust verdict for a supplied image digest.
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## Operational notes
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- Key management via Authority/DevOps runbooks.
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- Metrics for signing latency/throttle states.
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- Offline kit integration for signature verification.
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## Backlog references
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- Sprint 0186: `docs/implplan/SPRINT_0186_0001_0001_record_deterministic_execution.md` (SIGN-CORE-186-004, SIGN-CORE-186-005, SIGN-TEST-186-006 DONE; SIGN-REPLAY-186-003 blocked on upstream).
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- Sprint 0401: `docs/implplan/SPRINT_0401_0001_0001_reachability_evidence_chain.md` (SIGN-VEX-401-018 DONE; AUTH-REACH-401-005 TODO).
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- SIG docs/tasks in ../../TASKS.md (e.g., DOCS-SIG-26-006).
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## Epic alignment
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- **Epic 10 – Export Center:** provide signing pipelines, cosign interoperability, and provenance manifests for bundle promotion.
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- **Epic 19 – Attestor Console:** supply DSSE payloads and Proof-of-Entitlement enforcement feeding attestation workflows described in `docs/modules/attestor/`.
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