Merge commit from fork

* fix lfi and ssrf

* move utils to common

---------

Co-authored-by: d3do <chamlinx@outlook.com>
Co-authored-by: hiyouga <hiyouga@buaa.edu.cn>

src/llamafactory/api/common.py

@@ -12,14 +12,29 @@
 # 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)
@@ -32,3 +47,50 @@ def jsonify(data: "BaseModel") -> str:
         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}")