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Prevented static file corruption when URL fragment contains '..'.

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When running collectstatic with a hashing static file storage backend,
URLs referencing other files were normalized with posixpath.normpath.
This could corrupt URLs: for example 'a.css#b/../c' became just 'c'.

Normalization seems to be an artifact of the historical implementation.
It contained a home-grown implementation of posixpath.join which relied
on counting occurrences of .. and /, so multiple / had to be collapsed.

The new implementation introduced in the previous commit doesn't suffer
from this issue. So it seems safe to remove the normalization.

There was a test for this normalization behavior but I don't think it's
a good test. Django shouldn't modify CSS that way. If a developer has
rendundant /s, it's mostly an aesthetic issue and it isn't Django's job
to fix it. Conversely, if the user wants a series of /s, perhaps in the
URL fragment, Django shouldn't destroy it.

Refs #26249.
This commit is contained in:
Aymeric Augustin 2016-02-23 10:51:54 +01:00
parent 706b33fef8
commit 7f6fbc906a
4 changed files with 3 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
django/contrib/staticfiles/storage.py
View File

@ -170,14 +170,6 @@ class HashedFilesMixin(object):
if url.startswith('/') and not url.startswith(settings.STATIC_URL):
return matched
# This is technically not useful and could be considered a bug:
# we're making changes to our user's code for no good reason.
# Removing it makes test_template_tag_denorm fail, though, and I'm
# working on another bug, so I'm going to leave it there for now.
# When someone complains that /foo/bar#a/../b gets changed to
# /foo/bar#b, just remove it, as well as test_template_tag_denorm.
url = posixpath.normpath(url)
# Strip off the fragment so a path-like fragment won't interfere.
url_path, fragment = urldefrag(url)

2
tests/staticfiles_tests/project/documents/cached/css/fragments.css
View File

@ -1,7 +1,7 @@
@font-face {
src: url('fonts/font.eot?#iefix') format('embedded-opentype'),
url('fonts/font.svg#webfontIyfZbseF') format('svg');
url('fonts/font.svg#../path/to/fonts/font.svg') format('svg');
url('fonts/font.svg#path/to/../../fonts/font.svg') format('svg');
url('data:font/woff;charset=utf-8;base64,d09GRgABAAAAADJoAA0AAAAAR2QAAQAAAAAAAAAAAAA');
}
div {

4
tests/staticfiles_tests/project/documents/cached/denorm.css
View File

@ -1,4 +0,0 @@
@import url("..//cached///styles.css");
body {
background: #d3d6d8 url(img/relative.png );
}

14
tests/staticfiles_tests/test_storage.py
View File

@ -85,12 +85,12 @@ class TestHashedFiles(object):
def test_path_with_querystring_and_fragment(self):
relpath = self.hashed_file_path("cached/css/fragments.css")
self.assertEqual(relpath, "cached/css/fragments.ef92012a8c16.css")
self.assertEqual(relpath, "cached/css/fragments.59dc2b188043.css")
with storage.staticfiles_storage.open(relpath) as relfile:
content = relfile.read()
self.assertIn(b'fonts/font.a4b0478549d0.eot?#iefix', content)
self.assertIn(b'fonts/font.b8d603e42714.svg#webfontIyfZbseF', content)
self.assertIn(b'fonts/font.b8d603e42714.svg#../path/to/fonts/font.svg', content)
self.assertIn(b'fonts/font.b8d603e42714.svg#path/to/../../fonts/font.svg', content)
self.assertIn(b'data:font/woff;charset=utf-8;base64,d09GRgABAAAAADJoAA0AAAAAR2QAAQAAAAAAAAAAAAA', content)
self.assertIn(b'#default#VML', content)
@ -116,16 +116,6 @@ class TestHashedFiles(object):
self.assertNotIn(b"/static/styles_root.css", content)
self.assertIn(b"/static/styles_root.401f2509a628.css", content)
def test_template_tag_denorm(self):
relpath = self.hashed_file_path("cached/denorm.css")
self.assertEqual(relpath, "cached/denorm.c5bd139ad821.css")
with storage.staticfiles_storage.open(relpath) as relfile:
content = relfile.read()
self.assertNotIn(b"..//cached///styles.css", content)
self.assertIn(b"../cached/styles.bb84a0240107.css", content)
self.assertNotIn(b"url(img/relative.png )", content)
self.assertIn(b'url("img/relative.acae32e4532b.png', content)
def test_template_tag_relative(self):
relpath = self.hashed_file_path("cached/relative.css")
self.assertEqual(relpath, "cached/relative.b0375bd89156.css")