200 lines
7.4 KiB
Python
200 lines
7.4 KiB
Python
"""FastAPI-Dependencies fuer Authentifizierung und Autorisierung."""
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from __future__ import annotations
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import json
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from dataclasses import dataclass
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from datetime import datetime, timezone
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from fastapi import Cookie, Depends, Header, HTTPException, Request, Response, WebSocket, status
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from app.db import get_db
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from app.rbac import user_has_role, user_has_role_for_host
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from app.security.api_tokens import TOKEN_PREFIX, hash_token, token_has_scope
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from app.security.sessions import (
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SESSION_COOKIE_NAME,
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decode_session_token,
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is_expired,
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refresh_session_token,
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)
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@dataclass
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class CurrentUser:
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id: int
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username: str
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is_admin: bool
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async def get_current_user(
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response: Response,
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jh_session: str | None = Cookie(default=None, alias=SESSION_COOKIE_NAME),
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) -> CurrentUser:
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if jh_session is None:
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raise HTTPException(status.HTTP_401_UNAUTHORIZED, "Nicht angemeldet")
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payload = decode_session_token(jh_session)
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if payload is None or is_expired(payload):
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response.delete_cookie(SESSION_COOKIE_NAME)
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raise HTTPException(status.HTTP_401_UNAUTHORIZED, "Session abgelaufen oder ungueltig")
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conn = get_db()
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cursor = await conn.execute(
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"SELECT id, username, is_admin, is_active, session_version FROM users WHERE id = ?",
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(payload.user_id,),
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)
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row = await cursor.fetchone()
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if row is None or not row[3] or row[4] != payload.session_version:
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response.delete_cookie(SESSION_COOKIE_NAME)
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raise HTTPException(status.HTTP_401_UNAUTHORIZED, "Session ungueltig")
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# Gleitenden Idle-Timeout verlaengern (gleiche session_version/login_ts).
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new_token = refresh_session_token(payload)
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response.set_cookie(
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SESSION_COOKIE_NAME,
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new_token,
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httponly=True,
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secure=True,
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samesite="strict",
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max_age=None, # Session-Cookie; Ablauf wird serverseitig durchgesetzt
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path="/",
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)
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return CurrentUser(id=row[0], username=row[1], is_admin=bool(row[2]))
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async def get_current_user_ws(websocket: WebSocket) -> CurrentUser | None:
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"""Wie get_current_user(), aber fuer WebSocket-Handshakes: kein Cookie-Refresh
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(WebSockets erlauben nach dem Handshake kein Set-Cookie mehr), stattdessen
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wird der Idle-Timeout beim naechsten regulaeren HTTP-Request durchgesetzt."""
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token = websocket.cookies.get(SESSION_COOKIE_NAME)
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if token is None:
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return None
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payload = decode_session_token(token)
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if payload is None or is_expired(payload):
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return None
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conn = get_db()
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cursor = await conn.execute(
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"SELECT id, username, is_admin, is_active, session_version FROM users WHERE id = ?",
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(payload.user_id,),
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)
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row = await cursor.fetchone()
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if row is None or not row[3] or row[4] != payload.session_version:
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return None
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return CurrentUser(id=row[0], username=row[1], is_admin=bool(row[2]))
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async def require_global_admin(user: CurrentUser = Depends(get_current_user)) -> CurrentUser:
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if not user.is_admin:
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raise HTTPException(status.HTTP_403_FORBIDDEN, "Admin-Rechte erforderlich")
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return user
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def require_host_group_role(role_name: str):
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"""Dependency-Factory: prueft Rolle des Users fuer eine per Pfad-/Query-Param
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uebergebene host_group_id. Globale Admins duerfen immer."""
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async def _dep(host_group_id: int, user: CurrentUser = Depends(get_current_user)) -> CurrentUser:
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if user.is_admin:
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return user
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conn = get_db()
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allowed = await user_has_role(
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conn, user_id=user.id, host_group_id=host_group_id, role_name=role_name
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)
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if not allowed:
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raise HTTPException(status.HTTP_403_FORBIDDEN, "Keine Berechtigung fuer diese Hostgruppe")
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return user
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return _dep
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def require_host_role(role_name: str):
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"""Dependency-Factory: prueft Rolle des Users fuer einen konkreten host_id."""
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async def _dep(host_id: int, user: CurrentUser = Depends(get_current_user)) -> CurrentUser:
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if user.is_admin:
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return user
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conn = get_db()
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allowed = await user_has_role_for_host(
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conn, user_id=user.id, host_id=host_id, role_name=role_name
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)
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if not allowed:
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raise HTTPException(status.HTTP_403_FORBIDDEN, "Keine Berechtigung fuer diesen Host")
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return user
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return _dep
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# --- API-Tokens (siehe app/security/api_tokens.py, Migration 0005) -------------
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#
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# Tokens sind bewusst NUR fuer die Admin-/Verwaltungs-API gedacht (Hosts,
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# User, Rollen, ...), NICHT fuer SSH/RDP/SFTP-Sitzungen selbst -- die bleiben
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# ausschliesslich an eine eingeloggte, TOTP-verifizierte Browser-Session
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# gebunden. Ein Token ist nie maechtiger als sein explizit vergebener Scope,
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# auch wenn der zugehoerige User Admin ist (kein automatisches is_admin).
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# Die Tokenverwaltung selbst (/admin/tokens/*) laeuft ausschliesslich ueber
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# require_global_admin (Session), niemals ueber ein Token -- ein geleaktes
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# Token darf sich damit nicht selbst weitere/staerkere Tokens ausstellen.
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async def _validate_api_token(token: str, *, resource: str, action: str) -> CurrentUser | None:
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if not token.startswith(TOKEN_PREFIX):
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return None
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conn = get_db()
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token_hash = hash_token(token)
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cursor = await conn.execute(
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"SELECT at.id, at.user_id, at.scopes_json, at.expires_at, at.revoked_at, "
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"u.username, u.is_active "
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"FROM api_tokens at JOIN users u ON u.id = at.user_id WHERE at.token_hash = ?",
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(token_hash,),
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)
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row = await cursor.fetchone()
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if row is None:
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return None
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token_id, user_id, scopes_json, expires_at, revoked_at, username, is_active = row
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if revoked_at is not None or not is_active:
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return None
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now_str = datetime.now(timezone.utc).strftime("%Y-%m-%dT%H:%M:%S.%fZ")
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if expires_at is not None and expires_at <= now_str:
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return None
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scopes = json.loads(scopes_json)
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if not token_has_scope(scopes, resource, action):
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return None
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await conn.execute(
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"UPDATE api_tokens SET last_used_at = strftime('%Y-%m-%dT%H:%M:%fZ','now') WHERE id = ?",
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(token_id,),
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)
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await conn.commit()
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return CurrentUser(id=user_id, username=username, is_admin=False)
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def require_admin_or_scope(resource: str, action: str):
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"""Dependency-Factory fuer die Admin-API: erlaubt Zugriff entweder ueber
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eine eingeloggte Admin-Session (Cookie, wie bisher) ODER ueber ein
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API-Token mit passendem Scope (Header 'Authorization: Bearer <token>').
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'write' schliesst 'read' auf derselben Ressource ein (siehe
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token_has_scope)."""
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async def _dep(
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response: Response,
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jh_session: str | None = Cookie(default=None, alias=SESSION_COOKIE_NAME),
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authorization: str | None = Header(default=None),
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) -> CurrentUser:
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if authorization and authorization.startswith("Bearer "):
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token = authorization.removeprefix("Bearer ").strip()
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principal = await _validate_api_token(token, resource=resource, action=action)
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if principal is None:
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raise HTTPException(
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status.HTTP_401_UNAUTHORIZED,
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"Ungueltiges, abgelaufenes oder nicht ausreichend berechtigtes Token",
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)
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return principal
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user = await get_current_user(response, jh_session)
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if not user.is_admin:
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raise HTTPException(status.HTTP_403_FORBIDDEN, "Admin-Rechte erforderlich")
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return user
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return _dep
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