feat(plan-01): Phase 1 — relocate harness code to packages/casan-harness (symlink facade)

Physically move the pure-code subtrees out of .specify into the package, leaving compat symlinks at the old .specify/<dir> paths so every existing reference (internal CASAN_HARNESS_ROOT + external CI/docker/mjs) keeps resolving. Runtime state stays put. Moved (git mv): scripts/ tests/ security/ templates/ config/ governance/ memory/ .specify/<dir> -> packages/casan-harness/<dir> (+ .specify/<dir> symlink) Stays in .specify (state/governance/domain, handled later): logs/ agentops/ level5/ init-options.json traceability-map.json Python `.resolve()` self-location followed the compat symlink into packages and lost the app root; generate-casan-demo-context.py, generate-agentops-dashboard.py and dashboard-server.py now walk UP for the `.specify` state marker instead of a fixed parent depth (fixes "missing trace files" in run-casan4). Full gate: PASS=64 FAIL=0 SKIP=3 (CASAN_CI_STEP_TIMEOUT_SEC=1200 — track-a ~450s runs close to the 600s default and can tip over under load; this is timing variance, not a regression — it passed cleanly with headroom). Runtime log/audit artifacts kept unstaged. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-07-08 00:06:00 +09:00
parent 2c765c9a45
commit 664bd1f00c
229 changed files with 268 additions and 3 deletions
@@ -0,0 +1,73 @@
+#!/usr/bin/env python3
+"""CASAN Plan-09 — Evidence Pack verifier (MVP).
+
+Recomputes the hash of every file in a pack and compares it to the stored
+artifact-manifest.json. Any change to any packed file flips a hash and fails
+verification. (The bash wrapper additionally verifies the RSA signature over
+manifest-head.txt, which stops an attacker who rewrites the manifest too.)
+
+Argv: <pack_dir>
+Exit: 0 intact, 1 tamper detected / manifest missing.
+"""
+import hashlib
+import json
+import os
+import sys
+
+
+def main():
+    pack_dir = sys.argv[1]
+    manifest_path = os.path.join(pack_dir, "artifact-manifest.json")
+    if not os.path.isfile(manifest_path):
+        sys.stderr.write("EVIDENCE_PACK_NO_MANIFEST\n")
+        return 1
+    try:
+        manifest = json.load(open(manifest_path, encoding="utf-8"))
+    except ValueError:
+        sys.stderr.write("EVIDENCE_PACK_MANIFEST_CORRUPT\n")
+        return 1
+
+    stored = manifest.get("files", {})
+    mismatches = []
+
+    # Every file recorded in the manifest must still hash to the same value.
+    for fn, want in stored.items():
+        path = os.path.join(pack_dir, fn)
+        if not os.path.isfile(path):
+            mismatches.append(f"{fn}:missing")
+            continue
+        with open(path, "rb") as f:
+            got = hashlib.sha256(f.read()).hexdigest()
+        if got != want:
+            mismatches.append(f"{fn}:hash_changed")
+
+    # A new unmanifested file (except sig/head) is also tampering.
+    for fn in os.listdir(pack_dir):
+        if fn in ("artifact-manifest.json", "evidence-pack.sig", "manifest-head.txt"):
+            continue
+        if os.path.isfile(os.path.join(pack_dir, fn)) and fn not in stored:
+            mismatches.append(f"{fn}:unexpected_file")
+
+    # The stored manifest_head must match the recomputed head of `stored`.
+    canonical = json.dumps(stored, sort_keys=True, separators=(",", ":"))
+    head_now = hashlib.sha256(canonical.encode()).hexdigest()
+    if head_now != manifest.get("manifest_head"):
+        mismatches.append("manifest_head:mismatch")
+
+    if mismatches:
+        sys.stderr.write("EVIDENCE_PACK_TAMPERED " + " ".join(mismatches) + "\n")
+        return 1
+
+    cert = "unknown"
+    rs = os.path.join(pack_dir, "run-summary.json")
+    if os.path.isfile(rs):
+        try:
+            cert = str(json.load(open(rs, encoding="utf-8")).get("certified"))
+        except ValueError:
+            pass
+    print(f"EVIDENCE_PACK_INTACT files={len(stored)} certified={cert} head={head_now}")
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())