"""Gestion des cles SSH : generation, import, export, registre local.""" from __future__ import annotations import json import shutil import uuid from dataclasses import dataclass, field, asdict from pathlib import Path import paramiko from cryptography.hazmat.primitives import serialization from cryptography.hazmat.primitives.asymmetric import rsa, ed25519, ec from app.paths import DATA_DIR # noqa: E402 (chemins valables aussi en .exe) KEYS_FILE = DATA_DIR / "keys.json" DEFAULT_KEY_DIR = DATA_DIR / "keys" KEY_TYPE_ED25519 = "ed25519" KEY_TYPE_RSA = "rsa" KEY_TYPE_ECDSA_P256 = "ecdsa-p256" KEY_TYPE_ECDSA_P384 = "ecdsa-p384" KEY_TYPE_ECDSA_P521 = "ecdsa-p521" # Courbes elliptiques NIST utilisees par ECDSA. Ed25519 est aussi une courbe # elliptique (Curve25519) et reste le choix recommande : plus court, plus rapide, # et sans les interrogations qui entourent le choix des parametres des courbes NIST. ECDSA_CURVES = { KEY_TYPE_ECDSA_P256: ec.SECP256R1, KEY_TYPE_ECDSA_P384: ec.SECP384R1, KEY_TYPE_ECDSA_P521: ec.SECP521R1, } KEY_TYPE_LABELS = { KEY_TYPE_ED25519: "Ed25519 (recommande)", KEY_TYPE_ECDSA_P256: "ECDSA — courbe NIST P-256", KEY_TYPE_ECDSA_P384: "ECDSA — courbe NIST P-384", KEY_TYPE_ECDSA_P521: "ECDSA — courbe NIST P-521", KEY_TYPE_RSA: "RSA (compatibilite maximale)", } @dataclass class KeyEntry: id: str = field(default_factory=lambda: str(uuid.uuid4())) name: str = "" key_type: str = KEY_TYPE_ED25519 private_path: str = "" public_path: str = "" fingerprint: str = "" public_key_text: str = "" def to_dict(self) -> dict: return asdict(self) @staticmethod def from_dict(data: dict) -> "KeyEntry": e = KeyEntry() for k in KeyEntry.__dataclass_fields__: if k in data: setattr(e, k, data[k]) return e class KeyManager: def __init__(self, registry_path: Path = KEYS_FILE): self.registry_path = registry_path self.keys: list[KeyEntry] = [] self.load() # ---------- registre ---------- def load(self) -> None: DATA_DIR.mkdir(parents=True, exist_ok=True) DEFAULT_KEY_DIR.mkdir(parents=True, exist_ok=True) if not self.registry_path.exists(): self.keys = [] self.save() return try: raw = json.loads(self.registry_path.read_text(encoding="utf-8")) except (json.JSONDecodeError, OSError): raw = {"keys": []} self.keys = [KeyEntry.from_dict(k) for k in raw.get("keys", [])] def save(self) -> None: DATA_DIR.mkdir(parents=True, exist_ok=True) payload = {"keys": [k.to_dict() for k in self.keys]} self.registry_path.write_text(json.dumps(payload, indent=2, ensure_ascii=False), encoding="utf-8") def remove(self, key_id: str, delete_files: bool = False) -> None: entry = next((k for k in self.keys if k.id == key_id), None) if entry and delete_files: for p in (entry.private_path, entry.public_path): try: if p and Path(p).exists(): Path(p).unlink() except OSError: pass self.keys = [k for k in self.keys if k.id != key_id] self.save() # ---------- generation ---------- def generate_key( self, name: str, key_type: str = KEY_TYPE_ED25519, rsa_bits: int = 4096, passphrase: str | None = None, save_dir: Path | None = None, comment: str = "", ) -> KeyEntry: save_dir = save_dir or DEFAULT_KEY_DIR save_dir.mkdir(parents=True, exist_ok=True) safe_name = "".join(c for c in name if c.isalnum() or c in ("-", "_")) or "id_key" filename = f"id_{key_type}_{safe_name}" priv_path = save_dir / filename pub_path = save_dir / f"{filename}.pub" if key_type == KEY_TYPE_ED25519: private_key = ed25519.Ed25519PrivateKey.generate() elif key_type in ECDSA_CURVES: private_key = ec.generate_private_key(ECDSA_CURVES[key_type]()) else: private_key = rsa.generate_private_key(public_exponent=65537, key_size=rsa_bits) encryption = ( serialization.BestAvailableEncryption(passphrase.encode("utf-8")) if passphrase else serialization.NoEncryption() ) priv_bytes = private_key.private_bytes( encoding=serialization.Encoding.PEM, format=serialization.PrivateFormat.OpenSSH, encryption_algorithm=encryption, ) pub_bytes = private_key.public_key().public_bytes( encoding=serialization.Encoding.OpenSSH, format=serialization.PublicFormat.OpenSSH, ) comment_suffix = f" {comment}".rstrip() if comment else "" pub_text = pub_bytes.decode("utf-8") + comment_suffix + "\n" priv_path.write_bytes(priv_bytes) pub_path.write_text(pub_text, encoding="utf-8") try: priv_path.chmod(0o600) except OSError: pass fingerprint = self._fingerprint(pub_bytes) entry = KeyEntry( name=name, key_type=key_type, private_path=str(priv_path), public_path=str(pub_path), fingerprint=fingerprint, public_key_text=pub_text.strip(), ) self.keys.append(entry) self.save() return entry # ---------- import ---------- def import_key(self, name: str, private_key_path: str, public_key_path: str | None = None) -> KeyEntry: priv_path = Path(private_key_path) key_type, pub_text = self._inspect_private_key(priv_path) pub_path_str = "" if public_key_path and Path(public_key_path).exists(): pub_path_str = public_key_path pub_text = Path(public_key_path).read_text(encoding="utf-8").strip() else: guess = priv_path.with_suffix(priv_path.suffix + ".pub") if guess.exists(): pub_path_str = str(guess) pub_text = guess.read_text(encoding="utf-8").strip() fingerprint = pub_text.split()[1] if pub_text and len(pub_text.split()) > 1 else "" entry = KeyEntry( name=name, key_type=key_type, private_path=str(priv_path), public_path=pub_path_str, fingerprint=fingerprint[:16], public_key_text=pub_text, ) self.keys.append(entry) self.save() return entry def _inspect_private_key(self, priv_path: Path) -> tuple[str, str]: """Tente de determiner le type de cle sans mot de passe (best effort).""" for loader, ktype in ( (paramiko.Ed25519Key, KEY_TYPE_ED25519), (paramiko.RSAKey, KEY_TYPE_RSA), ): try: pkey = loader.from_private_key_file(str(priv_path)) pub_text = f"{pkey.get_name()} {pkey.get_base64()}" return ktype, pub_text except paramiko.PasswordRequiredException: return ktype, "" except (paramiko.SSHException, OSError): continue return "unknown", "" # ---------- export ---------- def export_public_key(self, entry: KeyEntry, destination: str) -> None: Path(destination).write_text(entry.public_key_text + "\n", encoding="utf-8") def export_private_key(self, entry: KeyEntry, destination: str) -> None: shutil.copyfile(entry.private_path, destination) @staticmethod def _fingerprint(pub_bytes: bytes) -> str: import base64 import hashlib parts = pub_bytes.split() if len(parts) < 2: return "" raw = base64.b64decode(parts[1]) digest = hashlib.sha256(raw).digest() return "SHA256:" + base64.b64encode(digest).decode("utf-8").rstrip("=")