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| #!/usr/bin/env python3 | |
| """RÉSURRECTION — reconstruit et vérifie le journal MCP LEGION depuis un miroir, sans aucun serveur LEGION. | |
| python3 resurrect.py MIROIR_URL EMPREINTE_CLE_RACINE --out DOSSIER_VIDE [--bitcoin-node] [--json] | |
| Entrées : UNIQUEMENT l'URL d'un miroir (https://…, http://… ou file://…) et l'empreinte sha256 (64 hex) de la clé racine. | |
| Dépendances : Python 3.8+ et le paquet `cryptography` (Ed25519). Aucune ligne de code LEGION n'est importée. | |
| Contrôles (tout échec = code de sortie 1, rien n'est déclaré « réussi ») : | |
| 1. trousseau : l'entrée 0 a l'empreinte donnée ; chaque sous-clé est chaînée (prev_hash, hash), approuvée par la racine | |
| et prouve la possession de sa clé ; révocations appliquées ; | |
| 2. checkpoint C2SP signé par une sous-clé « mcp-tlog » du trousseau (signed-note Ed25519) ; | |
| 3. chaque entrée : haché de feuille = tuile de niveau 0 ; JCS(entrée) identique octet pour octet ; leaf_index = position ; | |
| signature Ed25519 de l'enregistrement valide avec la clé que le trousseau associe à son key_id ; | |
| 4. tuiles de niveau >= 1 recalculées depuis le niveau inférieur ; racine recalculée = racine du checkpoint ; | |
| 5. chaque tête signée de heads.jsonl : signature valide, racine = racine recalculée à sa taille, preuve de cohérence | |
| RFC 6962 de cette taille vers le checkpoint calculée puis vérifiée ; | |
| 6. ancrages OpenTimestamps : head.canon.json = une tête signée vérifiée, le .ots engage bien sha256(head.canon.json), | |
| blocs Bitcoin déclarés dans le .ots. Statut « sealed » UNIQUEMENT si `ots verify` réussit avec un nœud Bitcoin | |
| (--bitcoin-node) ; sinon « pending ». | |
| """ | |
| import argparse | |
| import base64 | |
| import hashlib | |
| import json | |
| import os | |
| import shutil | |
| import struct | |
| import subprocess | |
| import sys | |
| import time | |
| import urllib.parse | |
| import urllib.request | |
| TILE = 256 | |
| LOG_NOTE_NAME = "legion-mcp-tlog" | |
| PURPOSE = "mcp-tlog" | |
| SIG_FIELDS = ("hash", "self_sig", "endorsement_sig") | |
| class Fail(Exception): | |
| pass | |
| # ---------- JSON canonique RFC 8785 (JCS), sans flottants (le journal n'en contient pas : un flottant = échec explicite) | |
| def jcs(o): | |
| if o is None: | |
| return "null" | |
| if o is True: | |
| return "true" | |
| if o is False: | |
| return "false" | |
| if isinstance(o, int): | |
| if abs(o) > 2 ** 53: | |
| raise Fail("JCS : entier hors de l'intervalle sûr") | |
| return str(o) | |
| if isinstance(o, float): | |
| raise Fail("JCS : flottant non pris en charge par ce vérificateur") | |
| if isinstance(o, str): | |
| return json.dumps(o, ensure_ascii=False) | |
| if isinstance(o, list): | |
| return "[" + ",".join(jcs(x) for x in o) + "]" | |
| if isinstance(o, dict): | |
| return "{" + ",".join(json.dumps(k, ensure_ascii=False) + ":" + jcs(o[k]) | |
| for k in sorted(o, key=lambda k: k.encode("utf-16-be"))) + "}" | |
| raise Fail("JCS : type %r" % type(o)) | |
| def canon(o): | |
| return jcs(o).encode("utf-8") | |
| # ---------- Merkle RFC 6962 / 9162 | |
| def leaf_hash(b): | |
| return hashlib.sha256(b"\x00" + b).digest() | |
| def node_hash(a, b): | |
| return hashlib.sha256(b"\x01" + a + b).digest() | |
| def _k(n): | |
| k = 1 | |
| while k * 2 < n: | |
| k *= 2 | |
| return k | |
| def mth(leaves): | |
| n = len(leaves) | |
| if n == 0: | |
| return hashlib.sha256(b"").digest() | |
| if n == 1: | |
| return leaves[0] | |
| k = _k(n) | |
| return node_hash(mth(leaves[:k]), mth(leaves[k:])) | |
| def consistency_proof(m, leaves): | |
| """RFC 6962 §2.1.2 SUBPROOF(m, D[n], true).""" | |
| def sub(m, d, b): | |
| n = len(d) | |
| if m == n: | |
| return [] if b else [mth(d)] | |
| k = _k(n) | |
| if m <= k: | |
| return sub(m, d[:k], b) + [mth(d[k:])] | |
| return sub(m - k, d[k:], False) + [mth(d[:k])] | |
| return sub(m, leaves, True) | |
| def verify_consistency(m, n, old_root, new_root, proof): | |
| """RFC 9162 §2.1.4.2.""" | |
| if m == n: | |
| return not proof and old_root == new_root | |
| if m == 0 or m > n: | |
| return False | |
| proof = list(proof) | |
| if m & (m - 1) == 0: # m puissance de 2 | |
| proof.insert(0, old_root) | |
| fn, sn = m - 1, n - 1 | |
| while fn & 1: | |
| fn >>= 1 | |
| sn >>= 1 | |
| if not proof: | |
| return False | |
| fr = sr = proof[0] | |
| for c in proof[1:]: | |
| if sn == 0: | |
| return False | |
| if fn & 1 or fn == sn: | |
| fr = node_hash(c, fr) | |
| sr = node_hash(c, sr) | |
| while fn and not fn & 1: | |
| fn >>= 1 | |
| sn >>= 1 | |
| else: | |
| sr = node_hash(sr, c) | |
| fn >>= 1 | |
| sn >>= 1 | |
| return fr == old_root and sr == new_root and sn == 0 | |
| # ---------- tuiles C2SP | |
| def tile_path(level, n, width=TILE): | |
| s = "%d" % n | |
| s = "0" * ((-len(s)) % 3) + s | |
| parts = [s[i:i + 3] for i in range(0, len(s), 3)] | |
| return "%s/%s" % (level, "/".join(["x" + x for x in parts[:-1]] + [parts[-1]])) + (".p/%d" % width if width < TILE else "") | |
| # ---------- Ed25519 | |
| def ed_verify(pub_raw, sig, msg): | |
| from cryptography.hazmat.primitives.asymmetric.ed25519 import Ed25519PublicKey | |
| try: | |
| Ed25519PublicKey.from_public_bytes(pub_raw).verify(sig, msg) | |
| return True | |
| except Exception: | |
| return False | |
| def b64(s): | |
| return base64.b64decode(s, validate=True) | |
| # ---------- trousseau | |
| def load_keyring(text, root_pin): | |
| keys, revoked, limits, compromised = {}, set(), {}, set() | |
| prev, root_pub = None, None | |
| for n, line in enumerate(l for l in text.splitlines() if l.strip()): | |
| e = json.loads(line) | |
| if n == 0: | |
| if e.get("type") != "key_register" or e.get("alg") != "Ed25519" or \ | |
| hashlib.sha256(b64(e["public_key_b64"])).hexdigest() != root_pin: | |
| raise Fail("trousseau : l'entrée 0 n'est pas la clé racine d'empreinte %s" % root_pin) | |
| root_pub = b64(e["public_key_b64"]) | |
| keys[root_pin] = dict(e, purpose="root") | |
| prev = e.get("hash") or hashlib.sha256(canon({k: v for k, v in e.items() if k not in SIG_FIELDS})).hexdigest() | |
| continue | |
| body = canon({k: v for k, v in e.items() if k not in SIG_FIELDS}) | |
| if e.get("prev_hash") != prev or e.get("hash") != hashlib.sha256(body).hexdigest(): | |
| raise Fail("trousseau : chaîne rompue à l'entrée %d" % n) | |
| if not ed_verify(root_pub, b64(e.get("endorsement_sig", "")), body): | |
| raise Fail("trousseau : entrée %d non approuvée par la racine" % n) | |
| if e["type"] == "key_register": | |
| pub = b64(e["public_key_b64"]) | |
| pin = hashlib.sha256(pub).hexdigest() | |
| if e.get("alg") != "Ed25519" or e.get("key_id") != "k1:" + pin[:32]: | |
| raise Fail("trousseau : key_id incohérent à l'entrée %d" % n) | |
| if not ed_verify(pub, b64(e.get("self_sig", "")), body): | |
| raise Fail("trousseau : preuve de possession absente à l'entrée %d" % n) | |
| keys[pin] = e | |
| elif e["type"] == "key_revoke": | |
| revoked.add(e["key_id"]) | |
| if isinstance(e.get("valid_until_tree_size"), int): | |
| limits[e["key_id"]] = min(e["valid_until_tree_size"], limits.get(e["key_id"], e["valid_until_tree_size"])) | |
| else: | |
| limits.pop(e["key_id"], None) | |
| compromised.add(e["key_id"]) | |
| else: | |
| raise Fail("trousseau : type inconnu %r" % e["type"]) | |
| prev = e["hash"] | |
| if root_pub is None: | |
| raise Fail("trousseau vide") | |
| def pub_for(pin, purpose, leaf_index=None, tree_size=None): | |
| e = keys.get(pin) | |
| if e is None: | |
| return None | |
| kid = "k1:" + pin[:32] | |
| if kid in revoked: | |
| lim = None if kid in compromised else limits.get(kid) | |
| if lim is None or not ((leaf_index is not None and leaf_index < lim) or (tree_size is not None and tree_size <= lim)): | |
| return None | |
| if e.get("purpose") not in (purpose, "root"): | |
| return None | |
| return b64(e["public_key_b64"]) | |
| return keys, pub_for | |
| def note_key_id(name, pub_raw, kind=0x01): | |
| return hashlib.sha256(name.encode() + b"\n" + bytes([kind]) + pub_raw).digest()[:4] | |
| # ---------- OpenTimestamps (lecture du .ots, sans confiance : seul `ots verify` + nœud scelle) | |
| OTS_MAGIC = b"\x00OpenTimestamps\x00\x00Proof\x00\xbf\x89\xe2\xe8\x84\xe8\x92\x94" | |
| BTC_TAG = bytes.fromhex("0588960d73d71901") | |
| def ots_info(ots): | |
| if not ots.startswith(OTS_MAGIC): | |
| raise Fail(".ots : en-tête invalide") | |
| p = len(OTS_MAGIC) + 1 # + octet de version | |
| if ots[p] != 0x08: # op SHA256 | |
| raise Fail(".ots : le fichier n'engage pas un sha256") | |
| digest = ots[p + 1:p + 33] | |
| blocks, i = [], 0 | |
| while True: | |
| i = ots.find(BTC_TAG, i) | |
| if i < 0: | |
| break | |
| j = i + len(BTC_TAG) | |
| ln, sh, k = 0, 0, j # varuint de la longueur de charge utile | |
| while True: | |
| b = ots[k]; ln |= (b & 0x7f) << sh; k += 1; sh += 7 | |
| if not b & 0x80: | |
| break | |
| h, sh, q = 0, 0, k | |
| while q < k + ln: | |
| b = ots[q]; h |= (b & 0x7f) << sh; q += 1; sh += 7 | |
| if not b & 0x80: | |
| break | |
| blocks.append(h) | |
| i = j | |
| return digest, sorted(set(blocks)) | |
| # ---------- récupération | |
| # Redirections (ex. CDN de Hugging Face) : suivies, comptées et rapportées. Aucune confiance accordée à l'hôte final : | |
| # chaque octet reçu est vérifié par les hachés de Merkle, la racine signée et les signatures (contrôles 2 à 6). | |
| REDIRECTS = {"count": 0, "hosts": {}} | |
| class _CountRedirects(urllib.request.HTTPRedirectHandler): | |
| def redirect_request(self, req, fp, code, msg, headers, newurl): | |
| REDIRECTS["count"] += 1 | |
| h = urllib.parse.urlsplit(newurl).hostname or "?" | |
| REDIRECTS["hosts"][h] = REDIRECTS["hosts"].get(h, 0) + 1 | |
| return super().redirect_request(req, fp, code, msg, headers, newurl) | |
| _OPENER = urllib.request.build_opener(_CountRedirects) | |
| def fetch(base, path, required=True): | |
| url = base.rstrip("/") + "/" + path | |
| try: | |
| with _OPENER.open(urllib.request.Request(url, headers={"User-Agent": "legion-resurrect/0.1", | |
| "Accept-Encoding": "identity"}), timeout=60) as r: | |
| return r.read() | |
| except Exception as e: | |
| if required: | |
| raise Fail("récupération impossible : %s (%s)" % (url, e)) | |
| return None | |
| def resurrect(mirror, root_pin, out, bitcoin_node=False, log=print): | |
| t0 = time.time() | |
| REDIRECTS.update(count=0, hosts={}) | |
| root_pin = root_pin.lower() | |
| if len(root_pin) != 64 or any(c not in "0123456789abcdef" for c in root_pin): | |
| raise Fail("empreinte racine : 64 caractères hexadécimaux attendus") | |
| if os.path.exists(out) and os.listdir(out): | |
| raise Fail("le dossier de sortie doit être vide : %s" % out) | |
| os.makedirs(out, exist_ok=True) | |
| rep = {"mirror": mirror, "root_pin": root_pin, "checks": {}} | |
| C = rep["checks"] | |
| kr_text = fetch(mirror, "keyring.jsonl").decode("utf-8") | |
| keys, pub_for = load_keyring(kr_text, root_pin) | |
| C["keyring_chain"] = "ok : %d clés (racine + %d sous-clés)" % (len(keys), len(keys) - 1) | |
| log("[1] trousseau vérifié depuis la racine épinglée :", C["keyring_chain"]) | |
| note = fetch(mirror, "checkpoint").decode("utf-8") | |
| body, _, sigs = note.partition("\n\n") | |
| body += "\n" | |
| lines = body.split("\n") | |
| origin, size, root = lines[0], int(lines[1]), b64(lines[2]) | |
| signed_by = None | |
| for sl in sigs.splitlines(): | |
| if not sl.startswith("— "): | |
| continue | |
| name, sb = sl[2:].rsplit(" ", 1) | |
| raw = b64(sb) | |
| for pin, e in keys.items(): | |
| pub = pub_for(pin, PURPOSE, tree_size=size) | |
| if pub and name == LOG_NOTE_NAME and raw[:4] == note_key_id(name, pub) and ed_verify(pub, raw[4:], body.encode()): | |
| signed_by = pin | |
| if not signed_by: | |
| raise Fail("checkpoint : aucune signature valide d'une clé mcp-tlog du trousseau") | |
| C["checkpoint"] = "ok : %s taille %d racine %s signé par %s" % (origin, size, root.hex(), signed_by) | |
| log("[2] checkpoint signé :", C["checkpoint"]) | |
| leaves, entries = [], [] | |
| for t in range((size + TILE - 1) // TILE): | |
| w = min(TILE, size - t * TILE) | |
| lvl0 = fetch(mirror, "tile/" + tile_path(0, t, w)) | |
| bundle = fetch(mirror, "tile/entries-u32/" + tile_path(0, t, w)[2:]) | |
| if len(lvl0) != 32 * w: | |
| raise Fail("tuile 0/%d : %d octets, %d attendus" % (t, len(lvl0), 32 * w)) | |
| p, k = 0, 0 | |
| while p < len(bundle): | |
| (ln,) = struct.unpack(">I", bundle[p:p + 4]) | |
| e = bundle[p + 4:p + 4 + ln] | |
| if len(e) != ln: | |
| raise Fail("paquet d'entrées %d tronqué" % t) | |
| if leaf_hash(e) != lvl0[32 * k:32 * k + 32]: | |
| raise Fail("entrée %d : haché de feuille différent de la tuile de niveau 0" % (t * TILE + k)) | |
| entries.append(e) | |
| leaves.append(lvl0[32 * k:32 * k + 32]) | |
| p += 4 + ln | |
| k += 1 | |
| if k != w: | |
| raise Fail("paquet d'entrées %d : %d entrées, %d attendues" % (t, k, w)) | |
| C["entries_vs_level0_tiles"] = "ok : %d entrées, chacune hachée = tuile de niveau 0" % len(entries) | |
| log("[3] entrées :", C["entries_vs_level0_tiles"]) | |
| # niveaux supérieurs : chaque tuile servie doit égaler le recalcul | |
| level, L, n_up = list(leaves), 0, 0 | |
| while True: | |
| full = len(level) // TILE | |
| nxt = [] | |
| for t in range(full): | |
| h = level[t * TILE:(t + 1) * TILE] | |
| while len(h) > 1: | |
| h = [node_hash(h[i], h[i + 1]) for i in range(0, len(h), 2)] | |
| nxt.append(h[0]) | |
| if not nxt: | |
| break | |
| L += 1 | |
| for t in range((len(nxt) + TILE - 1) // TILE): | |
| chunk = nxt[t * TILE:(t + 1) * TILE] | |
| if fetch(mirror, "tile/" + tile_path(L, t, len(chunk))) != b"".join(chunk): | |
| raise Fail("tuile %d/%d différente du recalcul" % (L, t)) | |
| n_up += 1 | |
| level = nxt | |
| recomputed = mth(leaves) | |
| if recomputed != root: | |
| raise Fail("racine recalculée %s != racine signée %s" % (recomputed.hex(), root.hex())) | |
| C["root"] = "ok : racine recalculée = racine signée = %s (%d tuile(s) de niveau >= 1 vérifiées)" % (root.hex(), n_up) | |
| log("[4] racine :", C["root"]) | |
| recs = [] | |
| for i, e in enumerate(entries): | |
| r = json.loads(e) | |
| if canon(r) != e: | |
| raise Fail("entrée %d : JSON non canonique (JCS)" % i) | |
| if r.get("leaf_index") != i: | |
| raise Fail("entrée %d : leaf_index %r (séquence rompue)" % (i, r.get("leaf_index"))) | |
| pub = pub_for(r.get("key_id", ""), PURPOSE, leaf_index=i) | |
| body_r = canon({k: v for k, v in r.items() if k != "signature_ed25519"}) | |
| if pub is None or not ed_verify(pub, b64(r.get("signature_ed25519", "")), body_r): | |
| raise Fail("entrée %d : signature invalide ou clé non autorisée (%s)" % (i, r.get("key_id"))) | |
| recs.append(r) | |
| by_key = {} | |
| for r in recs: | |
| by_key[r["key_id"][:16]] = by_key.get(r["key_id"][:16], 0) + 1 | |
| C["records"] = "ok : %d enregistrements signés, séquence 0..%d sans trou ; clés %s" % (len(recs), len(recs) - 1, by_key) | |
| log("[5] enregistrements :", C["records"]) | |
| heads_raw = fetch(mirror, "heads.jsonl").decode("utf-8") | |
| heads = {} | |
| for line in heads_raw.splitlines(): | |
| if not line.strip(): | |
| continue | |
| h = json.loads(line) | |
| th = h["tree_head"] | |
| m = th["tree_size"] | |
| pub = pub_for(th["issuer_pin_sha256"], PURPOSE, tree_size=m) | |
| if pub is None or not ed_verify(pub, b64(h["signature_ed25519"]), canon(th)): | |
| raise Fail("tête %d : signature invalide" % m) | |
| if m > size or mth(leaves[:m]).hex() != th["root_sha256"]: | |
| raise Fail("tête %d : racine différente du journal reconstruit" % m) | |
| proof = consistency_proof(m, leaves) | |
| if not verify_consistency(m, size, bytes.fromhex(th["root_sha256"]), root, proof): | |
| raise Fail("tête %d : preuve de cohérence vers %d invalide" % (m, size)) | |
| heads[m] = th | |
| C["signed_heads"] = "ok : têtes %s, signatures valides, cohérentes avec le checkpoint %d (preuves RFC 6962 vérifiées)" % (sorted(heads), size) | |
| log("[6] têtes signées :", C["signed_heads"]) | |
| manifest = json.loads(fetch(mirror, "phoenix.json", required=False) or b"{}") | |
| anchors = [] | |
| for m in manifest.get("anchors", []): | |
| hc = fetch(mirror, "anchors/%d/head.canon.json" % m) | |
| ots = fetch(mirror, "anchors/%d/head.canon.json.ots" % m, required=False) | |
| th = json.loads(hc) | |
| if canon(th) != hc or heads.get(m) != th: | |
| raise Fail("ancrage %d : head.canon.json n'est pas une tête signée vérifiée" % m) | |
| a = {"tree_size": m, "root": th["root_sha256"], "consistent_with_checkpoint": True} | |
| if ots is None: | |
| a.update(status="absent") | |
| else: | |
| digest, blocks = ots_info(ots) | |
| if digest != hashlib.sha256(hc).digest(): | |
| raise Fail("ancrage %d : le .ots n'engage pas sha256(head.canon.json)" % m) | |
| a.update(ots_commits_head=True, bitcoin_blocks_declared=blocks, status="pending", | |
| status_detail="blocs déclarés dans le .ots, non vérifiés par un nœud Bitcoin complet") | |
| if bitcoin_node and shutil.which("ots"): | |
| d = os.path.join(out, "anchors", str(m)) | |
| os.makedirs(d, exist_ok=True) | |
| open(os.path.join(d, "head.canon.json"), "wb").write(hc) | |
| open(os.path.join(d, "head.canon.json.ots"), "wb").write(ots) | |
| r = subprocess.run(["ots", "verify", "-f", os.path.join(d, "head.canon.json"), os.path.join(d, "head.canon.json.ots")], | |
| capture_output=True, text=True, timeout=300) | |
| if r.returncode == 0 and "Success" in (r.stdout + r.stderr): | |
| a.update(status="sealed", status_detail="ots verify réussi avec un nœud Bitcoin") | |
| else: | |
| a.update(status_detail="ots verify non concluant : %s" % (r.stdout + r.stderr).strip()[-200:]) | |
| anchors.append(a) | |
| log("[7] ancrage %d : %s %s" % (m, a["status"], a.get("bitcoin_blocks_declared", ""))) | |
| C["anchors"] = anchors or "aucun ancrage annoncé par le miroir" | |
| # le journal renaît : écriture dans le dossier vide | |
| with open(os.path.join(out, "records.jsonl"), "w", encoding="utf-8") as f: | |
| for e in entries: | |
| f.write(e.decode("utf-8") + "\n") | |
| open(os.path.join(out, "heads.jsonl"), "w", encoding="utf-8").write(heads_raw) | |
| open(os.path.join(out, "keyring.jsonl"), "w", encoding="utf-8").write(kr_text) | |
| open(os.path.join(out, "checkpoint"), "w", encoding="utf-8").write(note) | |
| rep["redirects"] = {"count": REDIRECTS["count"], "hosts": dict(REDIRECTS["hosts"]), | |
| "note": "contenu redirigé vérifié par Merkle + signatures, comme le reste"} | |
| rep.update(result="RÉSURRECTION RÉUSSIE", origin=origin, tree_size=size, root_sha256=root.hex(), | |
| signed_by=signed_by, elapsed_s=round(time.time() - t0, 1), | |
| finished_at=time.strftime("%Y-%m-%dT%H:%M:%SZ", time.gmtime())) | |
| json.dump(rep, open(os.path.join(out, "resurrection_report.json"), "w"), indent=1, ensure_ascii=False) | |
| return rep | |
| def main(argv): | |
| ap = argparse.ArgumentParser(description=__doc__.split("\n")[0]) | |
| ap.add_argument("mirror") | |
| ap.add_argument("root_pin") | |
| ap.add_argument("--out", required=True) | |
| ap.add_argument("--bitcoin-node", action="store_true", help="tenter `ots verify` (nœud Bitcoin Core requis)") | |
| ap.add_argument("--json", action="store_true") | |
| a = ap.parse_args(argv) | |
| quiet = (lambda *x: None) if a.json else print | |
| try: | |
| rep = resurrect(a.mirror, a.root_pin, a.out, a.bitcoin_node, quiet) | |
| except Fail as e: | |
| rep = {"result": "RÉSURRECTION ÉCHOUÉE", "mirror": a.mirror, "error": str(e)} | |
| print(json.dumps(rep, ensure_ascii=False) if a.json else "ÉCHEC : %s" % e) | |
| return 1 | |
| print(json.dumps(rep, ensure_ascii=False) if a.json else | |
| "%s : %s taille %d racine %s (%.1f s)" % (rep["result"], rep["origin"], rep["tree_size"], rep["root_sha256"], rep["elapsed_s"])) | |
| return 0 | |
| if __name__ == "__main__": | |
| sys.exit(main(sys.argv[1:])) | |