Merge pull request #167 from christianlouis/copilot/fix-uncontrolled-data-alert
Harden filename sanitization against path traversal attacks
This commit is contained in:
Christian Krakau-Louis
+5
-1
@@ -19,6 +19,7 @@ from app.models import FileRecord, ProcessingLog
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from app.tasks.convert_to_pdf import convert_to_pdf
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from app.tasks.process_document import process_document
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from app.utils.file_status import get_files_processing_status
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from app.utils.filename_utils import sanitize_filename
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# Set up logging
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logger = logging.getLogger(__name__)
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@@ -657,7 +658,10 @@ async def ui_upload(request: Request, file: UploadFile = File(...)):
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workdir = settings.workdir
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# Extract just the filename without any path components to prevent path traversal
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safe_filename = os.path.basename(file.filename)
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# First, use basename to remove any directory components
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base_filename = os.path.basename(file.filename)
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# Then sanitize the filename to remove special characters and ensure filesystem compatibility
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safe_filename = sanitize_filename(base_filename)
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# Generate a unique filename with UUID to prevent overwriting and filename conflicts
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unique_id = str(uuid.uuid4())
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@@ -70,25 +70,39 @@ def get_unique_filename(original_path, check_exists_func=None):
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def sanitize_filename(filename):
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"""
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Sanitize a filename to ensure it's valid across different file systems.
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r"""
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Sanitize a filename to ensure it's valid across different file systems
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and prevent path traversal attacks.
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Args:
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filename (str): The filename to sanitize
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Returns:
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str: A sanitized filename
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Security:
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- Removes path separators (/ and \)
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- Prevents path traversal patterns (..)
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- Replaces problematic characters with underscores
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- Ensures compatibility across Windows, Linux, and macOS
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"""
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# First, replace all path separators (both Unix and Windows style) with underscores
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sanitized = filename.replace("/", "_").replace("\\", "_")
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# Replace characters that are problematic in various filesystems
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# Keep only alphanumeric, dash, underscore, period, and space
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sanitized = re.sub(r"[^\w\-\. ]", "_", filename)
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sanitized = re.sub(r"[^\w\-\. ]", "_", sanitized)
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# Remove or replace path traversal patterns
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# Replace specifically '..' to prevent path traversal while preserving single dots
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sanitized = sanitized.replace("..", "_")
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# Replace multiple spaces/underscores with single ones
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sanitized = re.sub(r"__+", "_", sanitized)
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sanitized = re.sub(r" +", " ", sanitized)
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# Trim leading/trailing spaces and periods which cause issues in Windows
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sanitized = sanitized.strip(". ")
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# Trim leading/trailing spaces, periods, and underscores which cause issues in Windows
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sanitized = sanitized.strip(". _")
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# Ensure the filename isn't empty after sanitization
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if not sanitized or sanitized == ".":
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+155
-131
@@ -9,6 +9,7 @@ Tests cover:
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- Security issues (path traversal)
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- Error handling
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"""
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import io
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import os
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import pytest
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@@ -21,68 +22,63 @@ from fastapi.testclient import TestClient
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def mock_celery_tasks():
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"""Mock all Celery tasks to prevent execution."""
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# Patch the entire task object where it's used (in app.api.files)
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with patch("app.api.files.process_document") as mock_process_task, \
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patch("app.api.files.convert_to_pdf") as mock_convert_task:
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with (
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patch("app.api.files.process_document") as mock_process_task,
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patch("app.api.files.convert_to_pdf") as mock_convert_task,
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):
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# Setup default return values for .delay()
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mock_task = MagicMock()
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mock_task.id = "test-task-id-123"
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mock_process_task.delay.return_value = mock_task
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mock_convert_task.delay.return_value = mock_task
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yield {
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"process_document": mock_process_task.delay,
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"convert_to_pdf": mock_convert_task.delay
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}
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yield {"process_document": mock_process_task.delay, "convert_to_pdf": mock_convert_task.delay}
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@pytest.mark.integration
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class TestValidFileUploads:
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"""Tests for successful file uploads with various valid file types."""
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def test_upload_valid_pdf(self, client: TestClient, sample_pdf_path: str, mock_celery_tasks):
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"""Test uploading a valid PDF file."""
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with open(sample_pdf_path, "rb") as f:
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response = client.post(
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"/api/ui-upload",
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files={"file": ("document.pdf", f, "application/pdf")}
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)
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response = client.post("/api/ui-upload", files={"file": ("document.pdf", f, "application/pdf")})
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assert response.status_code == 200
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data = response.json()
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# Verify response structure
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assert "task_id" in data
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assert "status" in data
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assert "original_filename" in data
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assert "stored_filename" in data
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# Verify response values
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assert data["status"] == "queued"
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assert data["original_filename"] == "document.pdf"
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assert data["stored_filename"].endswith(".pdf")
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# Verify the processing task was called
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mock_celery_tasks["process_document"].assert_called_once()
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call_args = mock_celery_tasks["process_document"].call_args
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assert call_args.kwargs["original_filename"] == "document.pdf"
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def test_upload_valid_text_file(self, client: TestClient, mock_celery_tasks):
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"""Test uploading a valid text file."""
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text_content = b"This is a test text file.\nWith multiple lines."
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response = client.post(
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"/api/ui-upload",
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files={"file": ("document.txt", io.BytesIO(text_content), "text/plain")}
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"/api/ui-upload", files={"file": ("document.txt", io.BytesIO(text_content), "text/plain")}
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)
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assert response.status_code == 200
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data = response.json()
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assert data["original_filename"] == "document.txt"
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assert data["stored_filename"].endswith(".txt")
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# Text files should be converted to PDF
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mock_celery_tasks["convert_to_pdf"].assert_called_once()
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def test_upload_valid_image_jpeg(self, client: TestClient, mock_celery_tasks):
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"""Test uploading a valid JPEG image."""
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# Create a minimal valid JPEG
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@@ -91,19 +87,16 @@ class TestValidFileUploads:
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b"\xff\xdb\x00C\x00\x08\x06\x06\x07\x06\x05\x08\x07\x07\x07\t\t\x08\n"
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b"\xff\xd9"
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)
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response = client.post(
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"/api/ui-upload",
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files={"file": ("image.jpg", io.BytesIO(jpeg_content), "image/jpeg")}
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)
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response = client.post("/api/ui-upload", files={"file": ("image.jpg", io.BytesIO(jpeg_content), "image/jpeg")})
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assert response.status_code == 200
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data = response.json()
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assert data["original_filename"] == "image.jpg"
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# Images should be converted to PDF
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mock_celery_tasks["convert_to_pdf"].assert_called_once()
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def test_upload_valid_png_image(self, client: TestClient, mock_celery_tasks):
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"""Test uploading a valid PNG image."""
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# Create a minimal valid PNG (1x1 transparent pixel)
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@@ -112,51 +105,47 @@ class TestValidFileUploads:
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b"\x08\x06\x00\x00\x00\x1f\x15\xc4\x89\x00\x00\x00\nIDATx\x9cc\x00\x01"
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b"\x00\x00\x05\x00\x01\r\n-\xb4\x00\x00\x00\x00IEND\xaeB`\x82"
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)
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response = client.post(
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"/api/ui-upload",
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files={"file": ("screenshot.png", io.BytesIO(png_content), "image/png")}
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"/api/ui-upload", files={"file": ("screenshot.png", io.BytesIO(png_content), "image/png")}
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)
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assert response.status_code == 200
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data = response.json()
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assert data["original_filename"] == "screenshot.png"
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assert data["stored_filename"].endswith(".png")
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mock_celery_tasks["convert_to_pdf"].assert_called_once()
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def test_upload_office_document_docx(self, client: TestClient, mock_celery_tasks):
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"""Test uploading a Word document."""
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# Create minimal DOCX content (ZIP file with proper structure)
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docx_content = (
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b"PK\x03\x04\x14\x00\x00\x00\x08\x00" + b"\x00" * 50
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)
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docx_content = b"PK\x03\x04\x14\x00\x00\x00\x08\x00" + b"\x00" * 50
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response = client.post(
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"/api/ui-upload",
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files={"file": (
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"report.docx",
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io.BytesIO(docx_content),
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"application/vnd.openxmlformats-officedocument.wordprocessingml.document"
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)}
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files={
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"file": (
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"report.docx",
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io.BytesIO(docx_content),
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"application/vnd.openxmlformats-officedocument.wordprocessingml.document",
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)
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},
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)
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assert response.status_code == 200
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data = response.json()
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assert data["original_filename"] == "report.docx"
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assert data["stored_filename"].endswith(".docx")
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# Office documents should be converted to PDF
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mock_celery_tasks["convert_to_pdf"].assert_called_once()
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def test_upload_csv_file(self, client: TestClient, mock_celery_tasks):
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"""Test uploading a CSV file."""
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csv_content = b"name,age,city\nJohn,30,NYC\nJane,25,LA\n"
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response = client.post(
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"/api/ui-upload",
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files={"file": ("data.csv", io.BytesIO(csv_content), "text/csv")}
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)
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response = client.post("/api/ui-upload", files={"file": ("data.csv", io.BytesIO(csv_content), "text/csv")})
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assert response.status_code == 200
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data = response.json()
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assert data["original_filename"] == "data.csv"
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@@ -166,54 +155,49 @@ class TestValidFileUploads:
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@pytest.mark.integration
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class TestInvalidFileUploads:
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"""Tests for handling invalid or problematic file uploads."""
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def test_upload_file_too_large(self, client: TestClient):
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"""Test that files over 500MB are rejected."""
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# Create a large file content (mock it to avoid memory issues)
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large_content = b"x" * 1024 # 1KB for testing
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with patch("os.path.getsize") as mock_getsize:
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# Mock the file size to be over 500MB
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mock_getsize.return_value = 501 * 1024 * 1024 # 501MB
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response = client.post(
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"/api/ui-upload",
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files={"file": ("huge.pdf", io.BytesIO(large_content), "application/pdf")}
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"/api/ui-upload", files={"file": ("huge.pdf", io.BytesIO(large_content), "application/pdf")}
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)
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assert response.status_code == 413 # Request Entity Too Large
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assert "too large" in response.json()["detail"].lower()
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def test_upload_executable_file(self, client: TestClient, mock_celery_tasks):
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"""Test that executable files are handled (attempted conversion)."""
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exe_content = b"MZ\x90\x00" # PE header
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response = client.post(
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"/api/ui-upload",
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files={"file": ("program.exe", io.BytesIO(exe_content), "application/x-msdownload")}
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"/api/ui-upload", files={"file": ("program.exe", io.BytesIO(exe_content), "application/x-msdownload")}
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)
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# Per the code, unsupported types get a warning but are still processed
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assert response.status_code == 200
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# The system attempts conversion even for unsupported types
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mock_celery_tasks["convert_to_pdf"].assert_called_once()
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def test_upload_empty_file(self, client: TestClient, mock_celery_tasks):
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"""Test uploading an empty file."""
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response = client.post(
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"/api/ui-upload",
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files={"file": ("empty.txt", io.BytesIO(b""), "text/plain")}
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)
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response = client.post("/api/ui-upload", files={"file": ("empty.txt", io.BytesIO(b""), "text/plain")})
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# Empty files are accepted and queued for processing
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assert response.status_code == 200
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data = response.json()
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assert data["original_filename"] == "empty.txt"
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def test_upload_without_file(self, client: TestClient):
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"""Test POST request without a file."""
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response = client.post("/api/ui-upload")
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# FastAPI should return a validation error
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assert response.status_code == 422 # Unprocessable Entity
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@@ -222,134 +206,176 @@ class TestInvalidFileUploads:
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@pytest.mark.security
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class TestUploadSecurity:
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"""Tests for security aspects of file uploads."""
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def test_path_traversal_prevention_dotdot(self, client: TestClient, mock_celery_tasks):
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"""Test that path traversal attempts are prevented."""
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# Try to upload a file with path traversal in filename
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malicious_filename = "../../etc/passwd.pdf"
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pdf_content = b"%PDF-1.4\n%EOF"
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response = client.post(
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"/api/ui-upload",
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files={"file": (malicious_filename, io.BytesIO(pdf_content), "application/pdf")}
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"/api/ui-upload", files={"file": (malicious_filename, io.BytesIO(pdf_content), "application/pdf")}
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)
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assert response.status_code == 200
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data = response.json()
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# The original filename should be sanitized (only basename)
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assert data["original_filename"] == "passwd.pdf"
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assert ".." not in data["stored_filename"]
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assert "/" not in data["stored_filename"]
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def test_path_traversal_prevention_absolute(self, client: TestClient, mock_celery_tasks):
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"""Test that absolute path attempts are prevented."""
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malicious_filename = "/etc/shadow.pdf"
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pdf_content = b"%PDF-1.4\n%EOF"
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response = client.post(
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"/api/ui-upload",
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files={"file": (malicious_filename, io.BytesIO(pdf_content), "application/pdf")}
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"/api/ui-upload", files={"file": (malicious_filename, io.BytesIO(pdf_content), "application/pdf")}
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)
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assert response.status_code == 200
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data = response.json()
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# Only the basename should be kept
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assert data["original_filename"] == "shadow.pdf"
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assert not data["stored_filename"].startswith("/")
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def test_filename_with_special_characters(self, client: TestClient, mock_celery_tasks):
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"""Test handling of filenames with special characters."""
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special_filename = "file name with spaces & special!@#chars.pdf"
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pdf_content = b"%PDF-1.4\n%EOF"
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response = client.post(
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"/api/ui-upload",
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files={"file": (special_filename, io.BytesIO(pdf_content), "application/pdf")}
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"/api/ui-upload", files={"file": (special_filename, io.BytesIO(pdf_content), "application/pdf")}
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)
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assert response.status_code == 200
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data = response.json()
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# Original filename should be preserved (sanitized by basename)
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assert data["original_filename"] == special_filename
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# Original filename should be sanitized (special chars replaced with underscores)
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assert "!" not in data["original_filename"]
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assert "@" not in data["original_filename"]
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assert "#" not in data["original_filename"]
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# Spaces and basic characters should be preserved
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assert "file" in data["original_filename"]
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assert ".pdf" in data["original_filename"]
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# Stored filename should have UUID and extension
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assert data["stored_filename"].endswith(".pdf")
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def test_path_traversal_prevention_windows_style(self, client: TestClient, mock_celery_tasks):
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"""Test that Windows-style path traversal attempts are prevented."""
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# Try Windows-style path with backslashes
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malicious_filename = "..\\..\\..\\windows\\system32\\config.pdf"
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pdf_content = b"%PDF-1.4\n%EOF"
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response = client.post(
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"/api/ui-upload", files={"file": (malicious_filename, io.BytesIO(pdf_content), "application/pdf")}
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)
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assert response.status_code == 200
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data = response.json()
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# On Unix systems, os.path.basename doesn't recognize Windows backslashes,
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# so the full string goes to sanitize_filename which then:
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# 1. Replaces backslashes with underscores
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# 2. Replaces .. with underscores
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# 3. Strips leading/trailing underscores
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# Result: "windows_system32_config.pdf"
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expected_filename = "windows_system32_config.pdf"
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assert data["original_filename"] == expected_filename
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# Verify no dangerous characters remain
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assert "\\" not in data["original_filename"]
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assert ".." not in data["original_filename"]
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assert "/" not in data["original_filename"]
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def test_path_traversal_prevention_mixed_separators(self, client: TestClient, mock_celery_tasks):
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"""Test handling of filenames with mixed path separators."""
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malicious_filename = "../path\\to/file.pdf"
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pdf_content = b"%PDF-1.4\n%EOF"
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response = client.post(
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"/api/ui-upload", files={"file": (malicious_filename, io.BytesIO(pdf_content), "application/pdf")}
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)
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assert response.status_code == 200
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data = response.json()
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# os.path.basename recognizes Unix / separators and extracts "file.pdf"
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# sanitize_filename then ensures it's safe (already is in this case)
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expected_filename = "file.pdf"
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assert data["original_filename"] == expected_filename
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# Verify no dangerous characters remain
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assert "/" not in data["original_filename"]
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assert "\\" not in data["original_filename"]
|
||||
assert ".." not in data["original_filename"]
|
||||
|
||||
|
||||
@pytest.mark.integration
|
||||
class TestUploadErrorHandling:
|
||||
"""Tests for error handling during file uploads."""
|
||||
|
||||
|
||||
def test_upload_disk_write_failure(self, client: TestClient):
|
||||
"""Test handling of disk write failures."""
|
||||
with patch("builtins.open", side_effect=IOError("Disk full")):
|
||||
pdf_content = b"%PDF-1.4\n%EOF"
|
||||
|
||||
|
||||
response = client.post(
|
||||
"/api/ui-upload",
|
||||
files={"file": ("test.pdf", io.BytesIO(pdf_content), "application/pdf")}
|
||||
"/api/ui-upload", files={"file": ("test.pdf", io.BytesIO(pdf_content), "application/pdf")}
|
||||
)
|
||||
|
||||
|
||||
assert response.status_code == 500
|
||||
assert "Failed to save file" in response.json()["detail"]
|
||||
|
||||
|
||||
def test_upload_celery_task_failure(self, client: TestClient, mock_celery_tasks):
|
||||
"""Test handling when Celery task queueing fails."""
|
||||
mock_celery_tasks["process_document"].side_effect = Exception("Celery connection failed")
|
||||
|
||||
|
||||
pdf_content = b"%PDF-1.4\n%EOF"
|
||||
|
||||
|
||||
# The endpoint should still handle the error gracefully
|
||||
# In this case, the exception will propagate
|
||||
with pytest.raises(Exception):
|
||||
client.post(
|
||||
"/api/ui-upload",
|
||||
files={"file": ("test.pdf", io.BytesIO(pdf_content), "application/pdf")}
|
||||
)
|
||||
client.post("/api/ui-upload", files={"file": ("test.pdf", io.BytesIO(pdf_content), "application/pdf")})
|
||||
|
||||
|
||||
@pytest.mark.integration
|
||||
class TestUploadFilenameHandling:
|
||||
"""Tests for filename handling and UUID generation."""
|
||||
|
||||
|
||||
def test_unique_filename_generation(self, client: TestClient, mock_celery_tasks):
|
||||
"""Test that uploaded files get unique UUIDs."""
|
||||
pdf_content = b"%PDF-1.4\n%EOF"
|
||||
|
||||
|
||||
# Upload same file twice
|
||||
response1 = client.post(
|
||||
"/api/ui-upload",
|
||||
files={"file": ("same.pdf", io.BytesIO(pdf_content), "application/pdf")}
|
||||
"/api/ui-upload", files={"file": ("same.pdf", io.BytesIO(pdf_content), "application/pdf")}
|
||||
)
|
||||
|
||||
|
||||
response2 = client.post(
|
||||
"/api/ui-upload",
|
||||
files={"file": ("same.pdf", io.BytesIO(pdf_content), "application/pdf")}
|
||||
"/api/ui-upload", files={"file": ("same.pdf", io.BytesIO(pdf_content), "application/pdf")}
|
||||
)
|
||||
|
||||
|
||||
assert response1.status_code == 200
|
||||
assert response2.status_code == 200
|
||||
|
||||
|
||||
data1 = response1.json()
|
||||
data2 = response2.json()
|
||||
|
||||
|
||||
# Original filenames should be the same
|
||||
assert data1["original_filename"] == data2["original_filename"] == "same.pdf"
|
||||
|
||||
|
||||
# But stored filenames should be different (unique UUIDs)
|
||||
assert data1["stored_filename"] != data2["stored_filename"]
|
||||
|
||||
|
||||
def test_filename_without_extension(self, client: TestClient, mock_celery_tasks):
|
||||
"""Test handling of files without extensions."""
|
||||
content = b"Some content"
|
||||
|
||||
|
||||
response = client.post(
|
||||
"/api/ui-upload",
|
||||
files={"file": ("NOEXTENSION", io.BytesIO(content), "application/octet-stream")}
|
||||
"/api/ui-upload", files={"file": ("NOEXTENSION", io.BytesIO(content), "application/octet-stream")}
|
||||
)
|
||||
|
||||
|
||||
assert response.status_code == 200
|
||||
data = response.json()
|
||||
assert data["original_filename"] == "NOEXTENSION"
|
||||
@@ -360,30 +386,28 @@ class TestUploadFilenameHandling:
|
||||
@pytest.mark.integration
|
||||
class TestUploadMimeTypeDetection:
|
||||
"""Tests for MIME type detection and routing."""
|
||||
|
||||
|
||||
def test_pdf_by_extension_only(self, client: TestClient, mock_celery_tasks):
|
||||
"""Test PDF detection by file extension when MIME type is generic."""
|
||||
pdf_content = b"%PDF-1.4\n%EOF"
|
||||
|
||||
|
||||
response = client.post(
|
||||
"/api/ui-upload",
|
||||
files={"file": ("doc.pdf", io.BytesIO(pdf_content), "application/octet-stream")}
|
||||
"/api/ui-upload", files={"file": ("doc.pdf", io.BytesIO(pdf_content), "application/octet-stream")}
|
||||
)
|
||||
|
||||
|
||||
assert response.status_code == 200
|
||||
# Should route to process_document (not convert_to_pdf) based on extension
|
||||
mock_celery_tasks["process_document"].assert_called_once()
|
||||
|
||||
|
||||
def test_image_by_extension(self, client: TestClient, mock_celery_tasks):
|
||||
"""Test image detection by file extension."""
|
||||
# Generic binary content with image extension
|
||||
image_content = b"\x00\x01\x02\x03"
|
||||
|
||||
|
||||
response = client.post(
|
||||
"/api/ui-upload",
|
||||
files={"file": ("photo.jpg", io.BytesIO(image_content), "application/octet-stream")}
|
||||
"/api/ui-upload", files={"file": ("photo.jpg", io.BytesIO(image_content), "application/octet-stream")}
|
||||
)
|
||||
|
||||
|
||||
assert response.status_code == 200
|
||||
# Should route to convert_to_pdf based on .jpg extension
|
||||
mock_celery_tasks["convert_to_pdf"].assert_called_once()
|
||||
|
||||
Reference in New Issue
Block a user