File CVE-2020-26215.patch of Package python-notebook

From 1abd95130c3345accf002805fa7c12c7fcca5286 Mon Sep 17 00:00:00 2001
From: Min RK <benjaminrk@gmail.com>
Date: Thu, 15 Oct 2020 09:39:44 +0200
Subject: [PATCH] Validate redirect target in TrailingSlashHandler

Fixes open redirect vulnerability GHSA-c7vm-f5p4-8fqh
---
 notebook/base/handlers.py    | 14 ++++++++++----
 notebook/tests/test_paths.py | 18 ++++++++++++++++++
 2 files changed, 28 insertions(+), 4 deletions(-)

Index: notebook-5.7.8/notebook/base/handlers.py
===================================================================
--- notebook-5.7.8.orig/notebook/base/handlers.py
+++ notebook-5.7.8/notebook/base/handlers.py
@@ -857,13 +857,18 @@ class APIVersionHandler(APIHandler):
 
 class TrailingSlashHandler(web.RequestHandler):
     """Simple redirect handler that strips trailing slashes
-    
+
     This should be the first, highest priority handler.
     """
-    
+
     def get(self):
-        self.redirect(self.request.uri.rstrip('/'))
-    
+        path, sep, rest = self.request.uri.partition("?")
+        # trim trailing *and* leading /
+        # to avoid misinterpreting repeated '//'
+        path = "/" + path.strip("/")
+        new_uri = "".join([path, sep, rest])
+        self.redirect(new_uri)
+
     post = put = get
 
 
@@ -914,6 +919,7 @@ class RedirectWithParams(web.RequestHand
         url = sep.join([self._url, self.request.query])
         self.redirect(url, permanent=self._permanent)
 
+
 class PrometheusMetricsHandler(IPythonHandler):
     """
     Return prometheus metrics for this notebook server
Index: notebook-5.7.8/notebook/tests/test_paths.py
===================================================================
--- notebook-5.7.8.orig/notebook/tests/test_paths.py
+++ notebook-5.7.8/notebook/tests/test_paths.py
@@ -3,6 +3,8 @@ import re
 import nose.tools as nt
 
 from notebook.base.handlers import path_regex
+from notebook.utils import url_path_join
+from .launchnotebook import NotebookTestBase
 
 try: # py3
     assert_regex = nt.assert_regex
@@ -38,3 +40,18 @@ def test_path_regex_bad():
         '/y/x/foo',
     ):
         assert_not_regex(path, path_pat)
+
+
+class RedirectTestCase(NotebookTestBase):
+    def test_trailing_slash(self):
+        for uri, expected in (
+            ("/notebooks/mynotebook/", "/notebooks/mynotebook"),
+            ("////foo///", "/foo"),
+            ("//example.com/", "/example.com"),
+            ("/has/param/?hasparam=true", "/has/param?hasparam=true"),
+        ):
+            r = self.request("GET", uri, allow_redirects=False)
+            print(uri, expected)
+            assert r.status_code == 302
+            assert "Location" in r.headers
+            assert r.headers["Location"] == url_path_join(self.url_prefix, expected)