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# Copyright 2025 the LlamaFactory team.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import ipaddress
import json
import os
import socket
from typing import TYPE_CHECKING, Any
from urllib.parse import urlparse
from ..extras.misc import is_env_enabled
from ..extras.packages import is_fastapi_available
if is_fastapi_available():
from fastapi import HTTPException, status
if TYPE_CHECKING:
from pydantic import BaseModel
SAFE_MEDIA_PATH = os.environ.get("SAFE_MEDIA_PATH", os.path.join(os.path.dirname(__file__), "safe_media"))
ALLOW_LOCAL_FILES = is_env_enabled("ALLOW_LOCAL_FILES", "1")
def dictify(data: "BaseModel") -> dict[str, Any]:
try: # pydantic v2
return data.model_dump(exclude_unset=True)
except AttributeError: # pydantic v1
return data.dict(exclude_unset=True)
def jsonify(data: "BaseModel") -> str:
try: # pydantic v2
return json.dumps(data.model_dump(exclude_unset=True), ensure_ascii=False)
except AttributeError: # pydantic v1
return data.json(exclude_unset=True, ensure_ascii=False)
def check_lfi_path(path: str) -> None:
"""Checks if a given path is vulnerable to LFI. Raises HTTPException if unsafe."""
if not ALLOW_LOCAL_FILES:
raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Local file access is disabled.")
try:
os.makedirs(SAFE_MEDIA_PATH, exist_ok=True)
real_path = os.path.realpath(path)
safe_path = os.path.realpath(SAFE_MEDIA_PATH)
if not real_path.startswith(safe_path):
raise HTTPException(
status_code=status.HTTP_403_FORBIDDEN, detail="File access is restricted to the safe media directory."
)
except Exception:
raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="Invalid or inaccessible file path.")
def check_ssrf_url(url: str) -> None:
"""Checks if a given URL is vulnerable to SSRF. Raises HTTPException if unsafe."""
try:
parsed_url = urlparse(url)
if parsed_url.scheme not in ["http", "https"]:
raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="Only HTTP/HTTPS URLs are allowed.")
hostname = parsed_url.hostname
if not hostname:
raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="Invalid URL hostname.")
ip_info = socket.getaddrinfo(hostname, parsed_url.port)
ip_address_str = ip_info[0][4][0]
ip = ipaddress.ip_address(ip_address_str)
if not ip.is_global:
raise HTTPException(
status_code=status.HTTP_403_FORBIDDEN,
detail="Access to private or reserved IP addresses is not allowed.",
)
except socket.gaierror:
raise HTTPException(
status_code=status.HTTP_400_BAD_REQUEST, detail=f"Could not resolve hostname: {parsed_url.hostname}"
)
except Exception as e:
raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail=f"Invalid URL: {e}")
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