47 lines
3.2 KiB
Markdown
47 lines
3.2 KiB
Markdown
# Evidence Locker Attestation Contract (v1 · frozen 2025-11-20)
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Scope: Evidence Bundle v1 produced by Evidence Locker and consumed by Concelier, Excititor, Export Center, CLI, and Policy Engine.
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## Predicates & subjects
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- **Subject (mandatory):** Merkle root derived from `checksums.txt` (sha256 of the sorted file) for the sealed bundle. OCI digest of the tarball remains recorded as `bundle_oci_digest` inside the predicate for registry mirroring but is not the DSSE subject.
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- **Predicates (DSSE/In-Toto)**
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- `stellaops.evidence.bundle.v1`: declares bundle layout (manifests, CAS paths, replay log offsets, Merkle recipe, chunking strategy).
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- `stellaops.evidence.transparency.v1`: Rekor/log inclusion proof (UUID, log index, root hash at inclusion). Required when network-permitted; when offline, include `reason="offline"` and omit log pointers.
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- `stellaops.evidence.integrity.v1`: hashes for each payload (SBOMs, VEX, policy packs, telemetry snapshots), keyed by canonical path; must match entries in `bundle.manifest.schema.json`.
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## Required claim set
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- `bundle_id` (UUID v4)
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- `produced_at` (UTC ISO-8601)
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- `producer` (`evidence-locker:<region>`)
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- `subject_merkle_root` (sha256 from checksums.txt)
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- `hashes` (map: canonicalPath → sha256) sorted lexicographically
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- `sbom` (array of SPDX/CycloneDX digests and mediaTypes)
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- `vex` (array of VEX doc digests and schema versions)
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- `replay_manifest` (optional; digest + sequence number, ledger URI, dsseEnvelope)
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- `transparency` (optional; Rekor UUID, logIndex, rootHash, inclusionProof) or `reason="offline"`
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- `signing_profile` (`sovereign-default` | `fips` | `gost` | `pq-experimental`)
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## Bundling & signing rules
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- DSSE envelope is **mandatory** for every sealed bundle using the configured `ICryptoProviderRegistry` profile; keys must be short-lived (<24h) and recorded in provider registry.
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- Subject = sha256(Merkle root) from `checksums.txt`; verifier must recompute to match.
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- Hash list must match `bundle.manifest.schema.json` (entries + optional `hashSummary`), sorted by `canonicalPath`.
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- Rekor/logging policy:
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- If outbound log is allowed, submit to configured log and embed UUID/logIndex/rootHash in `transparency`.
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- If outbound log is disallowed/offline, set `transparency` to null and include `reason="offline"` plus `log_policy="skip"` inside the predicate.
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## Verification plan
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- Verify DSSE signature against provider registry (per profile) and check key expiry.
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- Recompute sha256 for every manifest entry and the Merkle root; fail if subject differs.
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- If `transparency` present, verify inclusion proof against bundled Rekor root; fail closed on mismatch. If absent, require `reason="offline"` and `log_policy="skip"`.
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- Emit verification report JSON (deterministic key order) and store beside bundle as `verify.json`.
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## Fixtures
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- Sample bundle + report: `docs/modules/evidence-locker/samples/bundle-v1-sample.tar.gz` (sha256 TBD at publish time).
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- Sample attestation envelope: `docs/modules/evidence-locker/samples/attestation-v1-sample.json`.
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## Ownership
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- Primary: Evidence Locker Guild.
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- Reviewers: Concelier Core Guild, Excititor Guild, Export Center Guild, Policy Guild.
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This contract is authoritative for Sprint 110 and blocks CONCELIER-ATTEST-73-001/002 and EXCITITOR-ATTEST-01-003/73-001/73-002.
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