python3Packages.sanic: add patch for CVE-2022-35920

Based on upstream 9d415e4ec63d31b3749fd540e2c2ac7c98dedcdd and

2fa28f1711a8e59c6f4d3468e9c2f8b6991188a2, adjusted to apply to

v22.3.2, raise the same exception as before and not remove any

imports.

diff --git a/sanic/mixins/routes.py b/sanic/mixins/routes.py

index 9e2cf96..e0cf86b 100644

--- a/sanic/mixins/routes.py

+++ b/sanic/mixins/routes.py

@@ -3,7 +3,7 @@ from contextlib import suppress

 from functools import partial, wraps

 from inspect import getsource, signature

 from mimetypes import guess_type

-from os import path

+from os import path, sep

 from pathlib import PurePath

 from re import sub

 from textwrap import dedent

@@ -775,23 +775,23 @@ class RouteMixin(metaclass=SanicMeta):

         content_type=None,

         __file_uri__=None,

     ):

-        # Using this to determine if the URL is trying to break out of the path

-        # served.  os.path.realpath seems to be very slow

-        if __file_uri__ and "../" in __file_uri__:

-            raise InvalidUsage("Invalid URL")

         # Merge served directory and requested file if provided

-        # Strip all / that in the beginning of the URL to help prevent python

-        # from herping a derp and treating the uri as an absolute path

-        root_path = file_path = file_or_directory

+        root_path = file_path = path.abspath(unquote(file_or_directory))

+

         if __file_uri__:

-            file_path = path.join(

-                file_or_directory, sub("^[/]*", "", __file_uri__)

-            )

+            # Strip all / that in the beginning of the URL to help prevent

+            # python from herping a derp and treating the uri as an

+            # absolute path

+            unquoted_file_uri = unquote(__file_uri__).lstrip("/")

+

+            segments = unquoted_file_uri.split("/")

+            if ".." in segments or any(sep in segment for segment in segments):

+                raise InvalidUsage("Invalid URL")

+

+            file_path = path.join(file_or_directory, unquoted_file_uri)

+            file_path = path.abspath(file_path)

-        # URL decode the path sent by the browser otherwise we won't be able to

-        # match filenames which got encoded (filenames with spaces etc)

-        file_path = path.abspath(unquote(file_path))

-        if not file_path.startswith(path.abspath(unquote(root_path))):

+        if not file_path.startswith(root_path):

             error_logger.exception(

                 f"File not found: path={file_or_directory}, "

                 f"relative_url={__file_uri__}"

diff --git a/tests/test_static.py b/tests/test_static.py

index 36a98e1..aeb625b 100644

--- a/tests/test_static.py

+++ b/tests/test_static.py

@@ -1,6 +1,7 @@

 import inspect

 import logging

 import os

+import sys

 from collections import Counter

 from pathlib import Path

@@ -8,7 +9,7 @@ from time import gmtime, strftime

 import pytest

-from sanic import text

+from sanic import Sanic, text

 from sanic.exceptions import FileNotFound

@@ -21,6 +22,22 @@ def static_file_directory():

     return static_directory

+@pytest.fixture(scope="module")

+def double_dotted_directory_file(static_file_directory: str):

+    """Generate double dotted directory and its files"""

+    if sys.platform == "win32":

+        raise Exception("Windows doesn't support double dotted directories")

+

+    file_path = Path(static_file_directory) / "dotted.." / "dot.txt"

+    double_dotted_dir = file_path.parent

+    Path.mkdir(double_dotted_dir, exist_ok=True)

+    with open(file_path, "w") as f:

+        f.write("DOT\n")

+    yield file_path

+    Path.unlink(file_path)

+    Path.rmdir(double_dotted_dir)

+

+

 def get_file_path(static_file_directory, file_name):

     return os.path.join(static_file_directory, file_name)

@@ -578,3 +595,40 @@ def test_resource_type_dir(app, static_file_directory):

 def test_resource_type_unknown(app, static_file_directory, caplog):

     with pytest.raises(ValueError):

         app.static("/static", static_file_directory, resource_type="unknown")

+

+

+@pytest.mark.skipif(

+    sys.platform == "win32",

+    reason="Windows does not support double dotted directories",

+)

+def test_dotted_dir_ok(

+    app: Sanic, static_file_directory: str, double_dotted_directory_file: Path

+):

+    app.static("/foo", static_file_directory)

+    dot_relative_path = str(

+        double_dotted_directory_file.relative_to(static_file_directory)

+    )

+    _, response = app.test_client.get("/foo/" + dot_relative_path)

+    assert response.status == 200

+    assert response.body == b"DOT\n"

+

+

+def test_breakout(app: Sanic, static_file_directory: str):

+    app.static("/foo", static_file_directory)

+

+    _, response = app.test_client.get("/foo/..%2Fstatic/test.file")

+    assert response.status == 400

+

+

+@pytest.mark.skipif(

+    sys.platform != "win32", reason="Block backslash on Windows only"

+)

+def test_double_backslash_prohibited_on_win32(

+    app: Sanic, static_file_directory: str

+):

+    app.static("/foo", static_file_directory)

+

+    _, response = app.test_client.get("/foo/static/..\\static/test.file")

+    assert response.status == 400

+    _, response = app.test_client.get("/foo/static\\../static/test.file")

+    assert response.status == 400

    hash = "sha256-4zdPp3X22dfZ5YlW3G5/OqeUxrt+NiFO9dk2XjEKXEg=";

  };

  patches = [

    ./22.3.2-CVE-2022-35920.patch

  ];

  postPatch = ''

    # Loosen dependency requirements.

    substituteInPlace setup.py \