96 lines
3.3 KiB
Python
96 lines
3.3 KiB
Python
from __future__ import annotations
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import os
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import secrets
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import time
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from datetime import datetime, timedelta, timezone
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from typing import Any
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from fastapi import Depends, HTTPException, Request, status
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from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
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import bcrypt
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from jose import JWTError, jwt
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ADMIN_USERNAME = os.getenv("ADMIN_USERNAME", "admin")
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ADMIN_PASSWORD_HASH = os.getenv("ADMIN_PASSWORD_HASH", "")
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ADMIN_JWT_SECRET = os.getenv("ADMIN_JWT_SECRET", "")
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ADMIN_JWT_EXPIRE_HOURS = int(os.getenv("ADMIN_JWT_EXPIRE_HOURS", "8"))
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ADMIN_LOGIN_MAX_ATTEMPTS = int(os.getenv("ADMIN_LOGIN_MAX_ATTEMPTS", "5"))
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ADMIN_LOGIN_WINDOW_SECONDS = int(os.getenv("ADMIN_LOGIN_WINDOW_SECONDS", "300"))
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bearer_scheme = HTTPBearer(auto_error=False)
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_login_attempts: dict[str, list[float]] = {}
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def admin_configured() -> bool:
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return bool(ADMIN_PASSWORD_HASH and ADMIN_JWT_SECRET and len(ADMIN_JWT_SECRET) >= 32)
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def verify_password(plain_password: str, password_hash: str) -> bool:
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try:
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return bcrypt.checkpw(plain_password.encode("utf-8"), password_hash.encode("utf-8"))
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except (ValueError, TypeError):
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return False
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def hash_password(plain_password: str) -> str:
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return bcrypt.hashpw(plain_password.encode("utf-8"), bcrypt.gensalt()).decode("utf-8")
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def _client_key(request: Request) -> str:
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return request.client.host if request.client else "unknown"
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def check_login_rate_limit(request: Request) -> None:
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key = _client_key(request)
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now = time.time()
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attempts = [ts for ts in _login_attempts.get(key, []) if now - ts < ADMIN_LOGIN_WINDOW_SECONDS]
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if len(attempts) >= ADMIN_LOGIN_MAX_ATTEMPTS:
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raise HTTPException(status_code=429, detail="Too many login attempts. Try again later.")
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_login_attempts[key] = attempts
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def record_failed_login(request: Request) -> None:
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key = _client_key(request)
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_login_attempts.setdefault(key, []).append(time.time())
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def create_access_token(username: str) -> str:
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expire = datetime.now(timezone.utc) + timedelta(hours=ADMIN_JWT_EXPIRE_HOURS)
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payload = {"sub": username, "exp": expire, "scope": "admin"}
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return jwt.encode(payload, ADMIN_JWT_SECRET, algorithm="HS256")
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def decode_access_token(token: str) -> dict[str, Any]:
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return jwt.decode(token, ADMIN_JWT_SECRET, algorithms=["HS256"])
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def _unauthorized(detail: str) -> HTTPException:
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return HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail=detail,
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headers={"WWW-Authenticate": "Bearer"},
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)
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async def require_admin(
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request: Request,
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credentials: HTTPAuthorizationCredentials | None = Depends(bearer_scheme),
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) -> dict[str, Any]:
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if not admin_configured():
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raise HTTPException(status_code=503, detail="Admin access is not configured")
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if credentials is None or credentials.scheme.lower() != "bearer":
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raise _unauthorized("Missing bearer token")
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try:
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payload = decode_access_token(credentials.credentials)
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except JWTError as exc:
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raise _unauthorized("Invalid or expired token") from exc
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if payload.get("sub") != ADMIN_USERNAME or payload.get("scope") != "admin":
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raise _unauthorized("Invalid token scope")
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return payload
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def generate_secret(length: int = 48) -> str:
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return secrets.token_urlsafe(length)
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