252 lines
9.3 KiB
Python
252 lines
9.3 KiB
Python
"""Small client for the encrypted Zyxel OPAL/DAL web API."""
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from __future__ import annotations
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import argparse
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import base64
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import json
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import os
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import sys
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from dataclasses import dataclass
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from pathlib import Path
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from typing import Any
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from urllib.parse import urlsplit
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import requests
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import yaml
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from Crypto.Cipher import AES, PKCS1_v1_5
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from Crypto.PublicKey import RSA
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from Crypto.Util.Padding import pad, unpad
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class ZyxelError(RuntimeError):
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"""The router rejected a request or returned an unexpected response."""
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def normalize_mac(value: str) -> str:
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compact = "".join(character for character in value if character.isalnum()).lower()
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if len(compact) != 12 or any(character not in "0123456789abcdef" for character in compact):
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raise ValueError(f"invalid MAC address: {value!r}")
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return ":".join(compact[index : index + 2] for index in range(0, 12, 2))
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@dataclass(frozen=True)
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class LanHost:
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mac: str
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active: bool
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hostname: str = ""
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ip_address: str = ""
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class ZyxelRouter:
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"""Read-only client for Zyxel routers using the OPAL DAL API."""
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def __init__(
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self,
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host: str,
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username: str,
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password: str,
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*,
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timeout: float = 10,
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verify_tls: bool = True,
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hosts_oid: str = "lanhosts",
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) -> None:
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if "://" not in host:
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host = f"http://{host}"
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parsed = urlsplit(host)
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if parsed.scheme not in {"http", "https"} or not parsed.netloc:
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raise ValueError("zyxel.host must be a hostname/IP, or an http(s) URL")
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self.url = host.rstrip("/")
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self.username = username
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self.password = password
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self.timeout = timeout
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self.verify_tls = verify_tls
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self.hosts_oid = hosts_oid
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self.session = requests.Session()
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self._aes_key: bytes | None = None
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self._session_key: str | None = None
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def __enter__(self) -> "ZyxelRouter":
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self.login()
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return self
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def __exit__(self, *_: object) -> None:
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self.close()
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def _request(self, method: str, path: str, **kwargs: Any) -> requests.Response:
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kwargs.setdefault("timeout", self.timeout)
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kwargs.setdefault("verify", self.verify_tls)
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try:
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response = self.session.request(method, f"{self.url}{path}", **kwargs)
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response.raise_for_status()
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return response
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except requests.RequestException as error:
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raise ZyxelError(f"Zyxel request failed: {error}") from error
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@staticmethod
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def _json(response: requests.Response) -> dict[str, Any]:
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try:
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value = response.json()
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except (requests.JSONDecodeError, ValueError) as error:
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raise ZyxelError("Zyxel returned a non-JSON response") from error
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if not isinstance(value, dict):
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raise ZyxelError("Zyxel returned an unexpected JSON response")
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return value
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def login(self) -> None:
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self._request("GET", "/GetInfoNoLogin")
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public_key = self._json(self._request("GET", "/getRSAPublickKey")).get("RSAPublicKey")
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if not public_key:
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raise ZyxelError("Zyxel did not return an RSA public key")
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self._aes_key = os.urandom(32)
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iv = os.urandom(32)
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login = {
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"Input_Account": self.username,
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"Input_Passwd": base64.b64encode(self.password.encode()).decode(),
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"currLang": "en",
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"RememberPassword": 0,
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}
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cipher = AES.new(self._aes_key, AES.MODE_CBC, iv[:16])
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content = cipher.encrypt(pad(json.dumps(login, separators=(",", ":")).encode(), 16))
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rsa = PKCS1_v1_5.new(RSA.import_key(public_key.encode()))
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encrypted_key = rsa.encrypt(base64.b64encode(self._aes_key))
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payload = {
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"content": base64.b64encode(content).decode(),
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"key": base64.b64encode(encrypted_key).decode(),
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"iv": base64.b64encode(iv).decode(),
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}
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result = self._decrypt(self._json(self._request("POST", "/UserLogin", json=payload)))
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if result.get("result") != "ZCFG_SUCCESS" or not result.get("sessionkey"):
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raise ZyxelError(f"Zyxel login failed: {result.get('result', 'unknown error')}")
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self._session_key = str(result["sessionkey"])
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def _decrypt(self, envelope: dict[str, Any]) -> dict[str, Any]:
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if "content" not in envelope or "iv" not in envelope:
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raise ZyxelError(str(envelope.get("result") or "unencrypted Zyxel response"))
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if self._aes_key is None:
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raise ZyxelError("not logged in")
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try:
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iv = base64.b64decode(envelope["iv"])[:16]
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encrypted = base64.b64decode(envelope["content"])
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clear = unpad(AES.new(self._aes_key, AES.MODE_CBC, iv).decrypt(encrypted), 16)
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result = json.loads(clear)
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except (ValueError, KeyError, json.JSONDecodeError) as error:
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raise ZyxelError("could not decrypt Zyxel response") from error
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if not isinstance(result, dict):
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raise ZyxelError("Zyxel returned an unexpected encrypted response")
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return result
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def dal_get(self, oid: str) -> dict[str, Any]:
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if not self._session_key:
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self.login()
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response = self._request(
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"GET", "/cgi-bin/DAL", params={"oid": oid, "sessionkey": self._session_key}
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)
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return self._decrypt(self._json(response))
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def get_lan_hosts(self) -> list[LanHost]:
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result = self.dal_get(self.hosts_oid)
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if result.get("result") not in (None, "ZCFG_SUCCESS"):
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raise ZyxelError(f"lanhosts query failed: {result.get('result')}")
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def host_records(value: Any):
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"""Yield host dictionaries from flat and nested DAL response shapes."""
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if isinstance(value, dict):
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if any(
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key in value
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for key in ("PhysAddress", "physAddress", "MACAddr", "MacAddress")
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):
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yield value
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return
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for child in value.values():
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yield from host_records(child)
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elif isinstance(value, list):
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for child in value:
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yield from host_records(child)
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hosts: list[LanHost] = []
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for item in host_records(result.get("Object", [])):
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raw_mac = next((item.get(key) for key in ("PhysAddress", "physAddress", "MACAddr", "MacAddress") if item.get(key)), None)
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if not raw_mac:
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continue
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try:
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mac = normalize_mac(str(raw_mac))
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except ValueError:
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continue
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raw_active = next((item.get(key) for key in ("Active", "active", "Enable", "enable") if key in item), True)
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active = raw_active if isinstance(raw_active, bool) else str(raw_active).lower() in {"1", "true", "yes", "active", "enabled"}
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hosts.append(LanHost(
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mac=mac,
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active=active,
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hostname=str(item.get("HostName") or item.get("hostName") or ""),
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ip_address=str(item.get("IPAddress") or item.get("ipAddress") or item.get("IPAddr") or ""),
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))
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return hosts
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def is_connected(self, mac: str) -> bool:
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wanted = normalize_mac(mac)
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return any(host.mac == wanted and host.active for host in self.get_lan_hosts())
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def close(self) -> None:
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if self._session_key:
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try:
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self._request("GET", "/cgi-bin/UserLogout", params={"sessionkey": self._session_key})
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except ZyxelError:
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pass
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self._session_key = None
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self._aes_key = None
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self.session.close()
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def _load_cli_config(path: Path) -> tuple[dict[str, Any], str]:
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try:
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with path.open(encoding="utf-8") as stream:
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root = yaml.safe_load(stream)
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arrival = root["arrival_detection"]
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return arrival["zyxel"], str(arrival["device"]["mac"])
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except (OSError, TypeError, KeyError, yaml.YAMLError) as error:
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raise ZyxelError(f"could not load configuration from {path}: {error}") from error
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def main() -> int:
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parser = argparse.ArgumentParser(
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description="Check whether a MAC address is connected to the configured Zyxel router."
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)
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parser.add_argument(
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"--config",
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type=Path,
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default=Path(__file__).resolve().parents[1] / "service.yaml",
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help="service configuration file (default: project service.yaml)",
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)
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parser.add_argument(
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"--mac",
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help="MAC address to check (default: arrival_detection.device.mac)",
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)
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args = parser.parse_args()
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try:
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config, configured_mac = _load_cli_config(args.config)
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mac = normalize_mac(args.mac or configured_mac)
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router = ZyxelRouter(
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config["host"],
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config["username"],
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config["password"],
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timeout=float(config.get("timeout", 10)),
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verify_tls=bool(config.get("verify_tls", True)),
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hosts_oid=str(config.get("hosts_oid", "lanhosts")),
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)
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try:
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connected = router.is_connected(mac)
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finally:
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router.close()
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print(f"{mac} {'connected' if connected else 'absent'}")
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return 0
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except (ValueError, ZyxelError) as error:
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print(f"error: {error}", file=sys.stderr)
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return 2
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if __name__ == "__main__":
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raise SystemExit(main())
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