twothatit
3d28f13054
Global MFA toggle in Security settings, QR code setup on first login, 6-digit TOTP verification on subsequent logins. Azure AD users exempt. Admins can reset user MFA. TOTP secrets encrypted at rest with Fernet. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
111 lines
3.6 KiB
Python
111 lines
3.6 KiB
Python
"""FastAPI dependencies — JWT authentication, database session, rate limiting."""
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from datetime import datetime, timedelta
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from typing import Optional
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from fastapi import Depends, HTTPException, status
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from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
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from jose import JWTError, jwt
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from sqlalchemy.orm import Session
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from app.database import get_db
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from app.models import User
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from app.utils.config import JWT_ALGORITHM, JWT_EXPIRE_MINUTES, SECRET_KEY
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security_scheme = HTTPBearer(auto_error=False)
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def create_access_token(username: str, expires_delta: Optional[timedelta] = None) -> str:
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"""Create a JWT access token.
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Args:
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username: The user identity to encode.
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expires_delta: Custom expiration; defaults to JWT_EXPIRE_MINUTES.
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Returns:
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Encoded JWT string.
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"""
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expire = datetime.utcnow() + (expires_delta or timedelta(minutes=JWT_EXPIRE_MINUTES))
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payload = {"sub": username, "exp": expire}
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return jwt.encode(payload, SECRET_KEY, algorithm=JWT_ALGORITHM)
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def create_mfa_token(username: str) -> str:
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"""Create a short-lived JWT for the MFA verification step (5 min)."""
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expire = datetime.utcnow() + timedelta(minutes=5)
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payload = {"sub": username, "exp": expire, "purpose": "mfa"}
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return jwt.encode(payload, SECRET_KEY, algorithm=JWT_ALGORITHM)
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def verify_mfa_token(token: str) -> str:
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"""Verify an MFA-purpose JWT and return the username.
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Raises HTTPException if the token is invalid, expired, or not an MFA token.
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"""
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try:
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payload = jwt.decode(token, SECRET_KEY, algorithms=[JWT_ALGORITHM])
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if payload.get("purpose") != "mfa":
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Invalid MFA token.",
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)
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username: Optional[str] = payload.get("sub")
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if not username:
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Invalid MFA token.",
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)
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return username
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except JWTError:
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="MFA token expired or invalid.",
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)
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def get_current_user(
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credentials: Optional[HTTPAuthorizationCredentials] = Depends(security_scheme),
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db: Session = Depends(get_db),
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) -> User:
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"""Validate the JWT bearer token and return the authenticated user.
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Args:
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credentials: Bearer token from the Authorization header.
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db: Database session.
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Returns:
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The authenticated User ORM object.
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Raises:
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HTTPException: If the token is missing, invalid, or the user is inactive.
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"""
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if credentials is None:
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Authentication required.",
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headers={"WWW-Authenticate": "Bearer"},
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)
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token = credentials.credentials
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try:
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payload = jwt.decode(token, SECRET_KEY, algorithms=[JWT_ALGORITHM])
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username: Optional[str] = payload.get("sub")
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if username is None:
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Invalid token payload.",
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)
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except JWTError:
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Invalid or expired token.",
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)
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user = db.query(User).filter(User.username == username).first()
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if user is None or not user.is_active:
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="User not found or inactive.",
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)
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return user
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