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Change method to prevent forbidden directory traversal. Fixes #1894

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This commit is contained in:
grossmj 2021-05-16 14:44:38 +09:30
parent 3a479d7ea6
commit 6847e19847
4 changed files with 13 additions and 10 deletions
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5
gns3server/handlers/api/compute/dynamips_vm_handler.py
View File

@ -470,7 +470,8 @@ class DynamipsVMHandler:
async def upload_image(request, response):
dynamips_manager = Dynamips.instance()
await dynamips_manager.write_image(request.match_info["filename"], request.content)
filename = os.path.normpath(request.match_info["filename"])
await dynamips_manager.write_image(filename, request.content)
response.set_status(204)
@Route.get(
@ -485,7 +486,7 @@ class DynamipsVMHandler:
description="Download a Dynamips IOS image")
async def download_image(request, response):
filename = request.match_info["filename"]
filename = os.path.normpath(request.match_info["filename"])
# Raise error if user try to escape
if filename[0] == "." or os.path.sep in filename:

5
gns3server/handlers/api/compute/iou_handler.py
View File

@ -428,7 +428,8 @@ class IOUHandler:
async def upload_image(request, response):
iou_manager = IOU.instance()
await iou_manager.write_image(request.match_info["filename"], request.content)
filename = os.path.normpath(request.match_info["filename"])
await iou_manager.write_image(filename, request.content)
response.set_status(204)
@ -444,7 +445,7 @@ class IOUHandler:
description="Download an IOU image")
async def download_image(request, response):
filename = request.match_info["filename"]
filename = os.path.normpath(request.match_info["filename"])
# Raise error if user try to escape
if filename[0] == "." or os.path.sep in filename:

5
gns3server/handlers/api/compute/qemu_handler.py
View File

@ -552,7 +552,8 @@ class QEMUHandler:
async def upload_image(request, response):
qemu_manager = Qemu.instance()
await qemu_manager.write_image(request.match_info["filename"], request.content)
filename = os.path.normpath(request.match_info["filename"])
await qemu_manager.write_image(filename, request.content)
response.set_status(204)
@Route.get(
@ -567,7 +568,7 @@ class QEMUHandler:
description="Download Qemu image")
async def download_image(request, response):
filename = request.match_info["filename"]
filename = os.path.normpath(request.match_info["filename"])
# Raise error if user try to escape
if filename[0] == "." or os.path.sep in filename:

8
gns3server/utils/path.py
View File

@ -17,6 +17,7 @@
import os
import aiohttp
from pathlib import Path
from ..config import Config
@ -37,15 +38,14 @@ def get_default_project_directory():
return path
def is_safe_path(file_path, directory):
def is_safe_path(file_path: str, basedir: str) -> bool:
"""
Check that file path is safe.
(the file is stored inside directory or one of its sub-directory)
"""
requested_path = os.path.abspath(file_path)
common_prefix = os.path.commonprefix([requested_path, directory])
return common_prefix != directory
test_path = (Path(basedir) / file_path).resolve()
return Path(basedir).resolve() in test_path.resolve().parents
def check_path_allowed(path):