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fe4a0bbe20
Thanks to Josh Schneier for the report, and to Carlton Gibson and Sarah Boyce for the reviews.
73 lines
2.7 KiB
Python
73 lines
2.7 KiB
Python
import os
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from unittest import mock
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from django.core.exceptions import SuspiciousFileOperation
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from django.core.files.storage import Storage
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from django.test import SimpleTestCase
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class CustomStorage(Storage):
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"""Simple Storage subclass implementing the bare minimum for testing."""
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def exists(self, name):
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return False
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def _save(self, name):
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return name
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class StorageValidateFileNameTests(SimpleTestCase):
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invalid_file_names = [
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os.path.join("path", "to", os.pardir, "test.file"),
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os.path.join(os.path.sep, "path", "to", "test.file"),
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]
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error_msg = "Detected path traversal attempt in '%s'"
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def test_validate_before_get_available_name(self):
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s = CustomStorage()
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# The initial name passed to `save` is not valid nor safe, fail early.
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for name in self.invalid_file_names:
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with (
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self.subTest(name=name),
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mock.patch.object(s, "get_available_name") as mock_get_available_name,
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mock.patch.object(s, "_save") as mock_internal_save,
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):
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with self.assertRaisesMessage(
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SuspiciousFileOperation, self.error_msg % name
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):
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s.save(name, content="irrelevant")
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self.assertEqual(mock_get_available_name.mock_calls, [])
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self.assertEqual(mock_internal_save.mock_calls, [])
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def test_validate_after_get_available_name(self):
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s = CustomStorage()
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# The initial name passed to `save` is valid and safe, but the returned
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# name from `get_available_name` is not.
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for name in self.invalid_file_names:
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with (
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self.subTest(name=name),
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mock.patch.object(s, "get_available_name", return_value=name),
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mock.patch.object(s, "_save") as mock_internal_save,
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):
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with self.assertRaisesMessage(
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SuspiciousFileOperation, self.error_msg % name
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):
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s.save("valid-file-name.txt", content="irrelevant")
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self.assertEqual(mock_internal_save.mock_calls, [])
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def test_validate_after_internal_save(self):
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s = CustomStorage()
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# The initial name passed to `save` is valid and safe, but the result
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# from `_save` is not (this is achieved by monkeypatching _save).
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for name in self.invalid_file_names:
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with (
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self.subTest(name=name),
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mock.patch.object(s, "_save", return_value=name),
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):
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with self.assertRaisesMessage(
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SuspiciousFileOperation, self.error_msg % name
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):
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s.save("valid-file-name.txt", content="irrelevant")
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