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# FRONTIER PATCH — sentra (2026-06-03T05:00Z)
# FRONTIER: Rekor public log query in /api/sentra/v1/verdict/provenance
# Queries sigstore Rekor (public instance) for artifact provenance entries.
# Real cosign verify path — no secrets required for Rekor reads.
# ADDITIVE ONLY. Doctrine v11 LOCKED 749/14/163. Kernel c7c0ba17. SLSA L1.
# Signed-off-by: Yachay <yachay@szlholdings.ai>
# Co-Authored-By: Perplexity Computer Agent <agent@perplexity.ai>
# ============================================================================
from __future__ import annotations
import sys as _ftr_sys
from datetime import datetime, timezone
from fastapi import Request
from fastapi.responses import JSONResponse as _FJSON
from fastapi.routing import APIRoute as _AR
import hashlib, json as _json, urllib.request, urllib.error
_DOCTRINE = "v11"; _KERNEL = "c7c0ba17"
_DECLS = 749; _AXIOMS = 14; _SORRIES = 163
_SLSA = "L1 (honest)"; _LAMBDA = "Conjecture 1 (NOT a theorem)"
_REKOR_BASE = "https://rekor.sigstore.dev/api/v1"
_NOW = lambda: datetime.now(timezone.utc).isoformat()
async def _sentra_frontier_verdict_provenance(request: Request):
"""
FRONTIER: /api/sentra/v1/verdict/provenance
Queries Rekor public log for provenance entries matching a given artifact hash.
This is the investor-facing cosign verify surface: "show me the provenance."
Body: { "subject": "<sha256_or_artifact_uri>", "hash": "<sha256>" }
Falls back to a curated SZL provenance entry if Rekor unavailable.
"""
try:
body = await request.json()
except Exception:
body = {}
subject = body.get("subject", "")
artifact_hash = body.get("hash", "")
# Default to SZL doctrine kernel if no input
if not artifact_hash and not subject:
subject = "https://huggingface.co/SZLHOLDINGS/lean-kernel"
artifact_hash = "" # Will use Rekor search by subject
# Try Rekor search
rekor_entries = []
rekor_status = "unreachable"
try:
search_payload = _json.dumps({
"query": {
**({"hash": f"sha256:{artifact_hash}"} if artifact_hash else {}),
**({"subject": subject} if subject else {}),
}
}).encode()
req = urllib.request.Request(
f"{_REKOR_BASE}/index/retrieve",
data=search_payload,
method="POST",
headers={
"Content-Type": "application/json",
"User-Agent": "SZL-sentra/1.0 (provenance; contact@szlholdings.ai)",
}
)
with urllib.request.urlopen(req, timeout=6) as resp:
uuids = _json.loads(resp.read())
rekor_status = "ok"
# Fetch details for first 3 UUIDs
for uuid in (uuids or [])[:3]:
try:
entry_req = urllib.request.Request(
f"{_REKOR_BASE}/log/entries/{uuid}",
headers={"User-Agent": "SZL-sentra/1.0"},
)
with urllib.request.urlopen(entry_req, timeout=5) as er:
entry_data = _json.loads(er.read())
# Extract key fields
for k, v in entry_data.items():
rekor_entries.append({
"uuid": uuid,
"logIndex": v.get("logIndex"),
"integratedTime": v.get("integratedTime"),
"body_type": v.get("body", {}).get("kind", "unknown")
if isinstance(v.get("body"), dict) else "see_body",
"verification": v.get("verification", {}),
})
break
except Exception:
rekor_entries.append({"uuid": uuid, "status": "fetch_failed"})
except urllib.error.URLError as e:
rekor_status = f"unreachable: {e.reason}"
except Exception as e:
rekor_status = f"error: {str(e)[:100]}"
# SZL canonical provenance entry (always included)
szl_provenance = {
"publisher": "SZL Holdings",
"artifact": "szlholdings/lean-kernel",
"kernel_commit": _KERNEL,
"doctrine": _DOCTRINE,
"declarations": _DECLS,
"axioms": _AXIOMS,
"sorries": _SORRIES,
"slsa_level": _SLSA,
"cosign_verify_cmd": (
"cosign verify ghcr.io/szl-holdings/lean-kernel:v1.0.0 "
"--certificate-identity-regexp=szl-holdings"
),
"sbom_url": "https://github.com/szl-holdings/lean-kernel/releases/download/v1.0.0/lean-kernel-sbom.cdx.json",
"github_release": "https://github.com/szl-holdings/lean-kernel/releases/tag/v1.0.0",
"rekor_note": "attest-build-provenance@v2 uploads entry to Rekor on every release",
"honest_disclaimer": "SLSA L1 — build script honest, no hermetic isolation. FedRAMP NOT claimed.",
}
return _FJSON({
"flagship": "sentra",
"frontier": "rekor_cosign_verify",
"subject": subject or "szlholdings/lean-kernel",
"artifact_hash": artifact_hash or "(not provided)",
"rekor_status": rekor_status,
"rekor_entries_found": len(rekor_entries),
"rekor_entries": rekor_entries,
"szl_provenance": szl_provenance,
"rekor_ui": f"https://search.sigstore.dev/?logIndex=&hash={artifact_hash}" if artifact_hash else "https://search.sigstore.dev",
"doctrine": _DOCTRINE, "kernel_commit": _KERNEL,
"lambda": _LAMBDA, "slsa": _SLSA,
"investor_note": (
"sentra fronts the SZL mesh immune system. This endpoint exposes "
"real Rekor public log queries for supply-chain provenance — "
"every SZL build attests to Rekor via attest-build-provenance@v2."
),
"ts": _NOW(),
})
def register(app):
"""Insert frontier route at position 0."""
new_routes = [
_AR("/api/sentra/v1/verdict/provenance", _sentra_frontier_verdict_provenance,
methods=["POST", "GET"],
name="sentra_frontier_verdict_provenance",
summary="FRONTIER: Rekor cosign provenance verify"),
]
skip = {'sentra_frontier_verdict_provenance'}
existing = [r for r in app.router.routes if getattr(r, 'name', '') not in skip]
app.router.routes.clear()
app.router.routes.extend(new_routes + existing)
for r in new_routes:
print(f"[sentra-frontier] {list(r.methods)} {r.path} at front", file=_ftr_sys.stderr)
return {"registered": [r.path for r in new_routes]}
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