250 lines
10 KiB
YAML
250 lines
10 KiB
YAML
# services/communication/guest-register-configmap.yaml
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apiVersion: v1
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kind: ConfigMap
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metadata:
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name: matrix-guest-register
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data:
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server.py: |
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import base64
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import json
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import os
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import random
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import secrets
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from http.server import BaseHTTPRequestHandler, HTTPServer
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from urllib import error, parse, request
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MATRIX_BASE = os.environ.get("MATRIX_BASE", "http://othrys-synapse-matrix-synapse:8008").rstrip("/")
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AUTH_BASE = os.environ.get("AUTH_BASE", "http://matrix-authentication-service:8080").rstrip("/")
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MAS_ADMIN_BASE = os.environ.get("MAS_ADMIN_BASE", "http://matrix-authentication-service:8081").rstrip("/")
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SERVER_NAME = os.environ.get("MATRIX_SERVER_NAME", "live.bstein.dev")
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MAS_ADMIN_CLIENT_ID = os.environ["MAS_ADMIN_CLIENT_ID"]
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MAS_ADMIN_CLIENT_SECRET_FILE = os.environ.get("MAS_ADMIN_CLIENT_SECRET_FILE", "/etc/mas/admin-client/client_secret")
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# Basic rate limiting (best-effort) to avoid accidental abuse.
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# Count requests per client IP over a short window.
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RATE_WINDOW_SEC = int(os.environ.get("RATE_WINDOW_SEC", "60"))
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RATE_MAX = int(os.environ.get("RATE_MAX", "30"))
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_rate = {} # ip -> [window_start, count]
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ADJ = ["brisk", "calm", "eager", "gentle", "merry", "nifty", "rapid", "sunny", "witty", "zesty"]
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NOUN = ["otter", "falcon", "comet", "ember", "grove", "harbor", "meadow", "raven", "river", "summit"]
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def _json(method, url, *, token=None, body=None, timeout=20):
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headers = {"Content-Type": "application/json"}
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if token:
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headers["Authorization"] = f"Bearer {token}"
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data = None
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if body is not None:
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data = json.dumps(body).encode()
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req = request.Request(url, data=data, headers=headers, method=method)
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try:
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with request.urlopen(req, timeout=timeout) as resp:
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raw = resp.read()
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payload = json.loads(raw.decode()) if raw else {}
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return resp.status, payload
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except error.HTTPError as e:
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raw = e.read()
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try:
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payload = json.loads(raw.decode()) if raw else {}
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except Exception:
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payload = {}
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return e.code, payload
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def _form(method, url, *, headers=None, fields=None, timeout=20):
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hdrs = {"Content-Type": "application/x-www-form-urlencoded"}
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if headers:
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hdrs.update(headers)
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data = parse.urlencode(fields or {}).encode()
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req = request.Request(url, data=data, headers=hdrs, method=method)
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try:
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with request.urlopen(req, timeout=timeout) as resp:
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raw = resp.read()
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payload = json.loads(raw.decode()) if raw else {}
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return resp.status, payload
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except error.HTTPError as e:
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raw = e.read()
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try:
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payload = json.loads(raw.decode()) if raw else {}
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except Exception:
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payload = {}
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return e.code, payload
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def _login(user, password):
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status, payload = _json(
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"POST",
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f"{AUTH_BASE}/_matrix/client/v3/login",
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body={
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"type": "m.login.password",
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"identifier": {"type": "m.id.user", "user": user},
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"password": password,
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},
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timeout=20,
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)
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if status != 200 or "access_token" not in payload:
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raise RuntimeError("login_failed")
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return payload
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_mas_admin_token = None
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_mas_admin_token_at = 0.0
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def _mas_admin_access_token(now):
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global _mas_admin_token, _mas_admin_token_at
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if _mas_admin_token and (now - _mas_admin_token_at) < 300:
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return _mas_admin_token
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with open(MAS_ADMIN_CLIENT_SECRET_FILE, encoding="utf-8") as fh:
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client_secret = fh.read().strip()
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creds = f"{MAS_ADMIN_CLIENT_ID}:{client_secret}".encode()
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basic = base64.b64encode(creds).decode()
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status, payload = _form(
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"POST",
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f"{AUTH_BASE}/oauth2/token",
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headers={"Authorization": f"Basic {basic}"},
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fields={"grant_type": "client_credentials"},
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timeout=20,
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)
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if status != 200 or "access_token" not in payload:
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raise RuntimeError("mas_admin_token_failed")
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_mas_admin_token = payload["access_token"]
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_mas_admin_token_at = now
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return _mas_admin_token
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def _mas_create_user(admin_token, username, password):
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status, payload = _json(
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"POST",
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f"{MAS_ADMIN_BASE}/api/admin/v1/users",
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token=admin_token,
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body={"username": username, "password": password},
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timeout=25,
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)
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if status in (200, 201):
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return
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if status == 409 or payload.get("errcode") == "M_ALREADY_EXISTS":
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raise RuntimeError("username_taken")
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raise RuntimeError("user_create_failed")
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def _generate_localpart():
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return "guest-" + secrets.token_hex(6)
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def _generate_displayname():
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return f"{random.choice(ADJ)}-{random.choice(NOUN)}"
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def _set_displayname(access_token, user_id, displayname):
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try:
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_json(
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"PUT",
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f"{MATRIX_BASE}/_matrix/client/v3/profile/{parse.quote(user_id)}/displayname",
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token=access_token,
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body={"displayname": displayname},
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timeout=15,
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)
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except Exception:
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return
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def _rate_check(ip, now):
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win, cnt = _rate.get(ip, (now, 0))
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if now - win > RATE_WINDOW_SEC:
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_rate[ip] = (now, 1)
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return True
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if cnt >= RATE_MAX:
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return False
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_rate[ip] = (win, cnt + 1)
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return True
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class Handler(BaseHTTPRequestHandler):
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server_version = "matrix-guest-register"
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def _send_json(self, code, payload):
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body = json.dumps(payload).encode()
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self.send_response(code)
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self.send_header("Content-Type", "application/json")
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self.send_header("Access-Control-Allow-Origin", "*")
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self.send_header("Access-Control-Allow-Methods", "GET, POST, OPTIONS")
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self.send_header("Access-Control-Allow-Headers", "Content-Type, Authorization, X-Requested-With")
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self.send_header("Content-Length", str(len(body)))
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self.end_headers()
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self.wfile.write(body)
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def do_OPTIONS(self): # noqa: N802
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self.send_response(204)
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self.send_header("Access-Control-Allow-Origin", "*")
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self.send_header("Access-Control-Allow-Methods", "GET, POST, OPTIONS")
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self.send_header("Access-Control-Allow-Headers", "Content-Type, Authorization, X-Requested-With")
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self.end_headers()
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def do_GET(self): # noqa: N802
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if self.path in ("/healthz", "/"):
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return self._send_json(200, {"ok": True})
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return self._send_json(404, {"errcode": "M_NOT_FOUND", "error": "not_found"})
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def do_POST(self): # noqa: N802
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# We only implement guest registration (used by Element Web "Join as guest").
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parsed = parse.urlparse(self.path)
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if parsed.path not in ("/_matrix/client/v3/register", "/_matrix/client/r0/register"):
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return self._send_json(404, {"errcode": "M_NOT_FOUND", "error": "not_found"})
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qs = parse.parse_qs(parsed.query)
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kind = (qs.get("kind") or ["user"])[0]
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if kind != "guest":
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return self._send_json(
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403,
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{
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"errcode": "M_FORBIDDEN",
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"error": "Registration is disabled; use https://bstein.dev/request-access for accounts.",
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},
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)
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# Best-effort client IP from X-Forwarded-For (Traefik).
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xfwd = self.headers.get("x-forwarded-for", "")
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ip = (xfwd.split(",")[0].strip() if xfwd else "") or self.client_address[0]
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now = __import__("time").time()
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if not _rate_check(ip, now):
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return self._send_json(429, {"errcode": "M_LIMIT_EXCEEDED", "error": "rate_limited"})
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# Consume request body (Element may send fields; we ignore).
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length = int(self.headers.get("content-length", "0") or "0")
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_ = self.rfile.read(length) if length else b"{}"
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# Create a short-lived "guest" account by provisioning a normal user with a random password.
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# This keeps MAS/OIDC intact while restoring a no-signup guest UX.
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try:
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displayname = _generate_displayname()
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password = base64.urlsafe_b64encode(secrets.token_bytes(24)).decode().rstrip("=")
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admin_token = _mas_admin_access_token(now)
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last = None
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for _ in range(3):
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localpart = _generate_localpart()
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try:
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_mas_create_user(admin_token, localpart, password)
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break
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except RuntimeError as e:
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last = str(e)
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if last != "username_taken":
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raise
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else:
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raise RuntimeError(last or "user_create_failed")
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login_payload = _login(localpart, password)
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_set_displayname(login_payload.get("access_token"), login_payload.get("user_id"), displayname)
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except Exception:
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return self._send_json(502, {"errcode": "M_UNKNOWN", "error": "guest_provision_failed"})
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resp = {
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"user_id": login_payload.get("user_id") or f"@{localpart}:{SERVER_NAME}",
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"access_token": login_payload.get("access_token"),
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"device_id": login_payload.get("device_id"),
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"home_server": SERVER_NAME,
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}
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# Do not expose refresh tokens for guests.
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return self._send_json(200, resp)
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def main():
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port = int(os.environ.get("PORT", "8080"))
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HTTPServer(("0.0.0.0", port), Handler).serve_forever()
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if __name__ == "__main__":
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main()
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