78 lines
3.6 KiB
Diff
78 lines
3.6 KiB
Diff
From c676b05c98df58252509dd5ad16b959c351ac770 Mon Sep 17 00:00:00 2001
|
|
From: nkrapp <nico.krapp@suse.com>
|
|
Date: Fri, 26 Jul 2024 14:01:36 +0200
|
|
Subject: [PATCH] Fixed CVE-2024-39329 -- Standarized timing of
|
|
verify_password() when checking unusuable passwords.
|
|
|
|
Refs #20760.
|
|
|
|
Thanks Michael Manfre for the fix and to Adam Johnson for the review.
|
|
---
|
|
django/contrib/auth/hashers.py | 10 ++++++++--
|
|
tests/auth_tests/test_hashers.py | 22 ++++++++++++++++++++++
|
|
2 files changed, 30 insertions(+), 2 deletions(-)
|
|
|
|
diff --git a/django/contrib/auth/hashers.py b/django/contrib/auth/hashers.py
|
|
index 1e8d7547fc..af55e57389 100644
|
|
--- a/django/contrib/auth/hashers.py
|
|
+++ b/django/contrib/auth/hashers.py
|
|
@@ -36,14 +36,20 @@ def check_password(password, encoded, setter=None, preferred='default'):
|
|
If setter is specified, it'll be called when you need to
|
|
regenerate the password.
|
|
"""
|
|
- if password is None or not is_password_usable(encoded):
|
|
- return False
|
|
+ fake_runtime = password is None or not is_password_usable(encoded)
|
|
|
|
preferred = get_hasher(preferred)
|
|
try:
|
|
hasher = identify_hasher(encoded)
|
|
except ValueError:
|
|
# encoded is gibberish or uses a hasher that's no longer installed.
|
|
+ fake_runtime = True
|
|
+
|
|
+ if fake_runtime:
|
|
+ # Run the default password hasher once to reduce the timing difference
|
|
+ # between an existing user with an unusable password and a nonexistent
|
|
+ # user or missing hasher (similar to #20760).
|
|
+ make_password(get_random_string(UNUSABLE_PASSWORD_SUFFIX_LENGTH))
|
|
return False
|
|
|
|
hasher_changed = hasher.algorithm != preferred.algorithm
|
|
diff --git a/tests/auth_tests/test_hashers.py b/tests/auth_tests/test_hashers.py
|
|
index ee6441b237..170bd07c4b 100644
|
|
--- a/tests/auth_tests/test_hashers.py
|
|
+++ b/tests/auth_tests/test_hashers.py
|
|
@@ -433,6 +433,28 @@ class TestUtilsHashPass(SimpleTestCase):
|
|
check_password('wrong_password', encoded)
|
|
self.assertEqual(hasher.harden_runtime.call_count, 1)
|
|
|
|
+ def test_check_password_calls_make_password_to_fake_runtime(self):
|
|
+ hasher = get_hasher("default")
|
|
+ cases = [
|
|
+ (None, None, None), # no plain text password provided
|
|
+ ("foo", make_password(password=None), None), # unusable encoded
|
|
+ ("letmein", make_password(password="letmein"), ValueError), # valid encoded
|
|
+ ]
|
|
+ for password, encoded, hasher_side_effect in cases:
|
|
+ with self.subTest(encoded=encoded):
|
|
+ with mock.patch("django.contrib.auth.hashers.identify_hasher", side_effect=hasher_side_effect) as mock_identify_hasher:
|
|
+ with mock.patch("django.contrib.auth.hashers.make_password") as mock_make_password:
|
|
+ with mock.patch("django.contrib.auth.hashers.get_random_string", side_effect=lambda size: "x" * size):
|
|
+ with mock.patch.object(hasher, "verify"):
|
|
+ # Ensure make_password is called to standardize timing.
|
|
+ check_password(password, encoded)
|
|
+ self.assertEqual(hasher.verify.call_count, 0)
|
|
+ self.assertEqual(mock_identify_hasher.mock_calls, [mock.call(encoded)])
|
|
+ self.assertEqual(
|
|
+ mock_make_password.mock_calls,
|
|
+ [mock.call("x" * UNUSABLE_PASSWORD_SUFFIX_LENGTH)],
|
|
+ )
|
|
+
|
|
|
|
class BasePasswordHasherTests(SimpleTestCase):
|
|
not_implemented_msg = 'subclasses of BasePasswordHasher must provide %s() method'
|
|
--
|
|
2.45.2
|
|
|