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Copy pathauth.py
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242 lines (209 loc) · 8.29 KB
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import hashlib
import hmac
import json
import os
import secrets
import subprocess
import threading
import time
SESSION_SECONDS = 12 * 3600
REMEMBER_SECONDS = 30 * 24 * 3600
MAX_FAILS, FAIL_WINDOW = 5, 300
MAX_CHECKS = 2
class Auth:
BELA_JS = ("const b=require(process.argv[1]);let d='';"
"process.stdin.on('data',c=>d+=c).on('end',()=>"
"process.exit(b.compareSync(d,process.argv[2])?0:1))")
DEMO_PASSWORD = "demo"
def __init__(self, state_dir, bela_config=None, demo=False):
self.bela_config = bela_config
self.demo = bool(demo)
self.dir = state_dir
self.path = os.path.join(state_dir, "auth.json")
self.code_path = os.path.join(state_dir, "setup-code")
self.sessions = {}
self.store_path = os.path.join(state_dir, "sessions.json")
self.fails = {}
self.lock = threading.Lock()
self.checks = threading.BoundedSemaphore(MAX_CHECKS)
os.makedirs(state_dir, exist_ok=True)
self.cfg = None
try:
with open(self.path) as f:
self.cfg = json.load(f)
except (OSError, ValueError):
pass
self.setup_code = None
if self.demo and not self.bela_hash():
salt = secrets.token_bytes(16)
self.cfg = {"salt": salt.hex(), "hash": self._hash(self.DEMO_PASSWORD, salt).hex()}
try:
os.remove(self.code_path)
except OSError:
pass
elif not self.cfg and not self.bela_hash() and not self.bela_pending():
self.setup_code = secrets.token_urlsafe(6)
fd = os.open(self.code_path, os.O_WRONLY | os.O_CREAT | os.O_TRUNC, 0o600)
with os.fdopen(fd, "w") as f:
f.write(self.setup_code + "\n")
else:
try:
os.remove(self.code_path)
except OSError:
pass
def _cred(self):
h = self.bela_hash() or ("demo" if self.demo else (self.cfg or {}).get("hash")) or ""
return hashlib.sha256(("pbcred:" + h).encode()).hexdigest()
@staticmethod
def _tok_id(tok):
return hashlib.sha256(tok.encode()).hexdigest()
def _remembered(self):
try:
with open(self.store_path) as f:
d = json.load(f)
except (OSError, ValueError):
return {}
return d if isinstance(d, dict) else {}
def _save_remembered(self, d):
tmp = self.store_path + ".tmp"
fd = os.open(tmp, os.O_WRONLY | os.O_CREAT | os.O_TRUNC, 0o600)
with os.fdopen(fd, "w") as f:
json.dump(d, f)
os.replace(tmp, self.store_path)
def bela_hash(self):
if not self.bela_config:
return None
try:
with open(self.bela_config) as f:
h = json.load(f).get("password_hash")
except (OSError, ValueError):
return None
return h if isinstance(h, str) and h.startswith("$2") else None
def bela_ok(self, pw, h):
mod = os.path.join(os.path.dirname(self.bela_config), "node_modules", "bcrypt")
try:
r = subprocess.run(["node", "-e", self.BELA_JS, mod, h],
input=pw.encode(), timeout=10,
stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
except (OSError, subprocess.TimeoutExpired):
raise RuntimeError("BELABOX-Passwortprüfung nicht möglich")
if r.returncode not in (0, 1):
raise RuntimeError("BELABOX-Passwortprüfung nicht möglich")
return r.returncode == 0
def bela_pending(self):
if not self.bela_config or self.bela_hash():
return False
return os.path.isdir(os.path.dirname(os.path.abspath(self.bela_config)))
@property
def mode(self):
if self.bela_hash():
return "belabox"
if self.demo and self.cfg:
return "demo"
if self.cfg:
return "own"
return "belabox-wartet" if self.bela_pending() else "own"
@property
def configured(self):
return bool(self.cfg) or self.mode == "belabox"
@staticmethod
def _hash(pw, salt):
return hashlib.pbkdf2_hmac("sha256", pw.encode(), salt, 300000, dklen=32)
def fail(self, ip):
with self.lock:
self.fails.setdefault(ip, []).append(time.time())
def reserve(self, ip):
now = time.time()
with self.lock:
f = [t for t in self.fails.get(ip, []) if now - t < FAIL_WINDOW]
if len(f) >= MAX_FAILS:
self.fails[ip] = f
return None
f.append(now)
self.fails[ip] = f
return now
def unreserve(self, ip, mark):
with self.lock:
f = self.fails.get(ip, [])
if mark in f:
f.remove(mark)
def check_password(self, ip, verify):
mark = self.reserve(ip)
if mark is None:
raise PermissionError("Zu viele Versuche, bitte 5 Minuten warten")
if not self.checks.acquire(blocking=False):
self.unreserve(ip, mark)
raise PermissionError("Die Box prüft gerade andere Anmeldungen, bitte gleich noch einmal versuchen")
try:
good = verify()
except BaseException:
self.unreserve(ip, mark)
raise
finally:
self.checks.release()
if good:
self.unreserve(ip, mark)
return good
WAITING_MSG = "Auf der BELABOX ist noch kein Passwort gesetzt. Bitte zuerst in der BELABOX-Oberfläche eines festlegen."
def set_password(self, code, pw, ip):
if self.mode == "belabox-wartet":
raise ValueError(self.WAITING_MSG)
if self.configured or not self.setup_code:
raise ValueError("Passwort ist schon gesetzt")
if not self.check_password(ip, lambda: hmac.compare_digest(code or "", self.setup_code)):
raise ValueError("Setup-Code falsch")
if len(pw or "") < 10:
raise ValueError("Passwort: mindestens 10 Zeichen")
salt = secrets.token_bytes(16)
self.cfg = {"salt": salt.hex(), "hash": self._hash(pw, salt).hex()}
tmp = self.path + ".tmp"
fd = os.open(tmp, os.O_WRONLY | os.O_CREAT | os.O_TRUNC, 0o600)
with os.fdopen(fd, "w") as f:
json.dump(self.cfg, f)
os.replace(tmp, self.path)
self.setup_code = None
try:
os.remove(self.code_path)
except OSError:
pass
def login(self, pw, ip, remember=False):
if not self.configured:
raise ValueError(self.WAITING_MSG if self.mode == "belabox-wartet" else "Noch kein Passwort gesetzt")
bh = self.bela_hash()
if bh:
verify = lambda: self.bela_ok(pw or "", bh)
else:
verify = lambda: hmac.compare_digest(self._hash(pw or "", bytes.fromhex(self.cfg["salt"])), bytes.fromhex(self.cfg["hash"]))
if not self.check_password(ip, verify):
raise ValueError("Passwort falsch")
tok = secrets.token_urlsafe(32)
with self.lock:
now = time.time()
self.sessions = {t: e for t, e in self.sessions.items() if e > now}
self.sessions[tok] = now + SESSION_SECONDS
if remember:
keep = {k: v for k, v in self._remembered().items()
if isinstance(v, list) and len(v) == 2 and v[0] > now and v[1] == self._cred()}
keep[self._tok_id(tok)] = [now + REMEMBER_SECONDS, self._cred()]
try:
self._save_remembered(keep)
except OSError:
pass
return tok
def valid(self, tok):
if not tok:
return False
with self.lock:
if self.sessions.get(tok, 0) > time.time():
return True
e = self._remembered().get(self._tok_id(tok))
return bool(isinstance(e, list) and len(e) == 2 and e[0] > time.time() and e[1] == self._cred())
def logout(self, tok):
with self.lock:
self.sessions.pop(tok or "", None)
r = self._remembered()
if r.pop(self._tok_id(tok or ""), None) is not None:
try:
self._save_remembered(r)
except OSError:
pass