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"""WebSocket-прокси для VNC-консоли.
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Поток данных:
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1. Backend получает от Proxmox одноразовый тикет через `vncproxy` (REST API).
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2. Открывает WebSocket к Proxmox с этим тикетом и портом. Аутентификация:
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- API-токен (заголовок `Authorization: PVEAPIToken=...`) — новые PVE ≥ 7.x
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- Cookie PVEAuthCookie + CSRFPreventionToken — если заданы PVE_USERNAME + PVE_PASSWORD
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3. Проксирует бинарный VNC-поток между браузером клиента и Proxmox.
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Особенности Proxmox 8.x+:
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- WebSocket-эндпоинт vncwebsocket возвращает 302 Redirect с Location со
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схемой https:// вместо wss://. Обрабатываем редирект вручную.
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- На WebSocket Proxmox может требовать одновременно Cookie и CSRF-токен.
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- Proxmox в Location редиректа часто возвращает свой self-reported
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origin. Если хост в Location не совпадает с тем, через который
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работает backend — заменяем его.
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- Известна race condition в Proxmox API "name '_client' is not defined"
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при быстрых последовательных запросах (cookie + websocket). Делаем
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задержку и retry.
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"""
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import asyncio
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import logging
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from typing import Optional, Tuple
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from urllib.parse import quote, urlparse, urlunparse
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import aiohttp
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import httpx
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from aiohttp import ClientSession, WSMsgType
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from fastapi import APIRouter, Query, WebSocket, WebSocketDisconnect
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from ..config import settings
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logger = logging.getLogger(__name__)
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router = APIRouter(prefix="/console", tags=["console"])
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def _rewrite_redirect(location: str, fallback_host: str) -> str:
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"""Переписывает URL редиректа: заменяет https→wss и нежелательные хосты."""
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if not location:
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return location
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# 1. ws/wss вместо http/https.
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if location.startswith("https://"):
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location = "wss://" + location[len("https://"):]
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elif location.startswith("http://"):
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location = "ws://" + location[len("http://"):]
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# 2. Заменяем хост, если он не совпадает с нашим.
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parsed = urlparse(location)
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if parsed.hostname:
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if ":" in fallback_host:
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fb_hostname, _, fb_port = fallback_host.partition(":")
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else:
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fb_hostname, fb_port = fallback_host, ""
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if parsed.hostname != fb_hostname:
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new_netloc = fb_hostname
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if fb_port:
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new_netloc = f"{fb_hostname}:{fb_port}"
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location = urlunparse(parsed._replace(netloc=new_netloc))
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return location
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async def _get_pve_auth_cookie() -> Optional[Tuple[str, str]]:
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"""Аутентифицируется в Proxmox по логину/паролю через REST API."""
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if not settings.pve_username or not settings.pve_password:
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return None
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url = f"{settings.pve_host}/api2/json/access/ticket"
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payload = {"username": settings.pve_username, "password": settings.pve_password}
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verify = settings.pve_verify_ssl
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try:
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async with httpx.AsyncClient(verify=verify, timeout=10.0) as client:
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resp = await client.post(url, data=payload)
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resp.raise_for_status()
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data = resp.json().get("data", {})
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cookie = data.get("ticket")
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csrf = data.get("CSRFPreventionToken")
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if not cookie:
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logger.error("auth: Proxmox не вернул PVEAuthCookie")
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return None
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logger.info(
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"auth: PVEAuthCookie получен (len=%d, csrf_prefix=%s)",
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len(cookie), (csrf or "")[:8],
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)
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return f"PVEAuthCookie={cookie}", csrf or ""
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except Exception as exc:
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logger.exception("auth: ошибка аутентификации в Proxmox")
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return None
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@router.websocket("/ws")
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async def console_ws(
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websocket: WebSocket,
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node: str = Query(...),
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vmid: int = Query(...),
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guest_type: str = Query(...),
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port: int = Query(...),
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ticket: str = Query(...),
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):
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"""Проксирует бинарный VNC-поток между браузером и Proxmox."""
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await websocket.accept()
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guest_path = "qemu" if guest_type == "vm" else "lxc"
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pve_backend_host = settings.pve_host.replace("http://", "").replace("https://", "").split(":")[0]
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pve_backend_port = settings.pve_host.replace("http://", "").replace("https://", "").split(":")[-1]
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if not pve_backend_port.isdigit():
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pve_backend_port = "8006"
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fallback_host = f"{pve_backend_host}:{pve_backend_port}"
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safe_ticket = quote(ticket, safe="")
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safe_port = quote(str(port), safe="")
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upstream_url = (
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f"wss://{fallback_host}/api2/json/nodes/{node}/{guest_path}/{vmid}/vncwebsocket"
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f"?port={safe_port}&vncticket={safe_ticket}"
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)
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# Аутентификация.
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use_cookie = bool(settings.pve_username and settings.pve_password)
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headers: dict = {}
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csrf_token: Optional[str] = None
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auth_kind = "api-token"
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if use_cookie:
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auth = await _get_pve_auth_cookie()
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if auth:
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cookie_header, csrf_token = auth
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headers["Cookie"] = cookie_header
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if csrf_token:
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headers["CSRFPreventionToken"] = csrf_token
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auth_kind = "cookie"
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else:
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logger.warning("console_ws: cookie не получен, fallback на API-токен")
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if auth_kind == "api-token":
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headers["Authorization"] = (
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f"PVEAPIToken={settings.pve_token_name}={settings.pve_token_value}"
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)
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logger.info(
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"console_ws: connecting node=%s vmid=%s guest=%s port=%s auth=%s ticket_prefix=%s",
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node, vmid, guest_type, port, auth_kind, safe_ticket[:24],
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)
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upstream: Optional[aiohttp.ClientWebSocketResponse] = None
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session: Optional[ClientSession] = None
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try:
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if auth_kind == "cookie":
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await asyncio.sleep(1.0)
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session = ClientSession()
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last_exc: Optional[Exception] = None
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for attempt in range(1, 4):
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try:
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resp = await session.get(
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upstream_url,
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headers=headers,
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allow_redirects=False,
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ssl=False if not settings.pve_verify_ssl else None,
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)
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body = await resp.text()
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logger.info(
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"console_ws: attempt=%s initial GET status=%s, location=%s, body=%s",
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attempt,
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resp.status,
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resp.headers.get("Location", "<none>"),
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body[:200],
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)
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if resp.status in (301, 302, 303, 307, 308):
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location = resp.headers.get("Location", "")
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upstream_url = _rewrite_redirect(location, fallback_host)
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logger.info("console_ws: rewritten URL to %s", upstream_url)
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await resp.release()
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break
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elif resp.status == 101:
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await resp.release()
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break
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elif resp.status >= 500 and "name '_client' is not defined" in body:
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await resp.release()
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logger.warning(
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"console_ws: Proxmox race condition, попытка %s/3 через 2с",
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attempt,
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)
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if attempt < 3:
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await asyncio.sleep(2.0)
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continue
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else:
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await resp.release()
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raise aiohttp.ClientResponseError(
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request_info=resp.request_info,
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history=resp.history,
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status=resp.status,
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message=body[:120],
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headers=resp.headers,
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)
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except Exception as exc:
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last_exc = exc
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logger.warning("console_ws: attempt %s ошибка: %s", attempt, exc)
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if attempt < 3:
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await asyncio.sleep(2.0)
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continue
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else:
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raise last_exc or RuntimeError("не удалось открыть WebSocket к Proxmox")
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upstream = await session.ws_connect(
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upstream_url,
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headers=headers,
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ssl=False if not settings.pve_verify_ssl else None,
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autoclose=False,
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autoping=True,
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max_msg_size=8 * 1024 * 1024,
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)
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logger.info("console_ws: upstream connected")
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async def client_to_upstream():
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try:
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while True:
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data = await websocket.receive_bytes()
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await upstream.send_bytes(data)
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except WebSocketDisconnect:
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logger.info("console_ws: client disconnected")
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except Exception as exc:
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logger.warning("console_ws: client_to_upstream error: %s", exc)
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async def upstream_to_client():
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try:
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async for msg in upstream:
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if msg.type == WSMsgType.BINARY:
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await websocket.send_bytes(msg.data)
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elif msg.type == WSMsgType.TEXT:
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await websocket.send_bytes(msg.data.encode())
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elif msg.type == WSMsgType.CLOSE:
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logger.info("console_ws: upstream close: %s", msg.data)
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break
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elif msg.type == WSMsgType.ERROR:
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logger.warning("console_ws: upstream error: %s", msg.data)
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break
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except Exception as exc:
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logger.warning("console_ws: upstream_to_client error: %s", exc)
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await asyncio.gather(client_to_upstream(), upstream_to_client())
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except aiohttp.ClientResponseError as exc:
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logger.error(
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"console_ws: Proxmox ответил status=%s, auth=%s, message=%s",
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exc.status, auth_kind, exc.message,
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)
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await websocket.close(code=1011, reason=f"Proxmox {exc.status}")
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except Exception as exc: # noqa: BLE001
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logger.exception("console_ws: ошибка подключения к Proxmox")
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await websocket.close(code=1011, reason=str(exc)[:120])
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finally:
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if upstream is not None:
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try:
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await upstream.close()
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except Exception:
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pass
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if session is not None:
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try:
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await session.close()
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except Exception:
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pass
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