Matej Cepl
602adbc016
bsc#1208471) blocklists bypass via the urllib.parse component when supplying a URL that starts with blank characters OBS-URL: https://build.opensuse.org/package/show/devel:languages:python:Factory/python310?expand=0&rev=76
56 lines
2.4 KiB
Diff
56 lines
2.4 KiB
Diff
From a284d69de1d1a42714576d4a9562145a94e62127 Mon Sep 17 00:00:00 2001
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From: Ben Kallus <benjamin.p.kallus.gr@dartmouth.edu>
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Date: Sat, 12 Nov 2022 15:43:33 -0500
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Subject: [PATCH 1/2] gh-99418: Prevent urllib.parse.urlparse from accepting
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schemes that don't begin with an alphabetical ASCII character.
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---
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Lib/test/test_urlparse.py | 18 ++++++++++
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Lib/urllib/parse.py | 2 -
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Misc/NEWS.d/next/Library/2022-11-12-15-45-51.gh-issue-99418.FxfAXS.rst | 2 +
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3 files changed, 21 insertions(+), 1 deletion(-)
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--- a/Lib/test/test_urlparse.py
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+++ b/Lib/test/test_urlparse.py
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@@ -668,6 +668,24 @@ class UrlParseTestCase(unittest.TestCase
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with self.assertRaises(ValueError):
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p.port
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+ def test_attributes_bad_scheme(self):
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+ """Check handling of invalid schemes."""
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+ for bytes in (False, True):
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+ for parse in (urllib.parse.urlsplit, urllib.parse.urlparse):
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+ for scheme in (".", "+", "-", "0", "http&", "६http"):
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+ with self.subTest(bytes=bytes, parse=parse, scheme=scheme):
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+ url = scheme + "://www.example.net"
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+ if bytes:
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+ if url.isascii():
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+ url = url.encode("ascii")
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+ else:
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+ continue
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+ p = parse(url)
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+ if bytes:
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+ self.assertEqual(p.scheme, b"")
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+ else:
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+ self.assertEqual(p.scheme, "")
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+
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def test_attributes_without_netloc(self):
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# This example is straight from RFC 3261. It looks like it
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# should allow the username, hostname, and port to be filled
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--- a/Lib/urllib/parse.py
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+++ b/Lib/urllib/parse.py
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@@ -469,7 +469,7 @@ def urlsplit(url, scheme='', allow_fragm
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clear_cache()
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netloc = query = fragment = ''
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i = url.find(':')
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- if i > 0:
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+ if i > 0 and url[0].isascii() and url[0].isalpha():
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for c in url[:i]:
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if c not in scheme_chars:
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break
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--- /dev/null
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+++ b/Misc/NEWS.d/next/Library/2022-11-12-15-45-51.gh-issue-99418.FxfAXS.rst
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@@ -0,0 +1,2 @@
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+Fix bug in :func:`urllib.parse.urlparse` that causes URL schemes that begin
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+with a digit, a plus sign, or a minus sign to be parsed incorrectly.
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