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raise an exception instead of returning an empty list for pkcs7 cert loading

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liningjie 2023-11-05 19:40:18 +08:00
parent 58e1cd48b5
commit 1f33ff60e9
2 changed files with 76 additions and 1 deletions
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70
backport-raise-an-exception-instead-of-returning-an-empty-list-for-pkcs7-cert-loading.patch Normal file
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@ -0,0 +1,70 @@
From 6e9dc67ed5d8151d5b7604ad1a97b57cd367e028 Mon Sep 17 00:00:00 2001
From: Paul Kehrer <paul.l.kehrer@gmail.com>
Date: Sun, 5 Nov 2023 19:36:55 +0800
Subject: [PATCH] raise an exception instead of returning an empty list for
pkcs7 cert loading (#9947)
* raise an exception instead of returning an empty list
as davidben points out in #9926 we are calling a specific load
certificates function and an empty value doesn't necessarily mean empty
because PKCS7 contains multitudes. erroring is more correct.
* changelog
* Update CHANGELOG.rst
Co-authored-by: Alex Gaynor <alex.gaynor@gmail.com>
---------
Co-authored-by: Alex Gaynor <alex.gaynor@gmail.com>
---
src/cryptography/hazmat/backends/openssl/backend.py | 7 +++++--
tests/hazmat/primitives/test_pkcs7.py | 6 +++---
2 files changed, 8 insertions(+), 5 deletions(-)
diff --git a/src/cryptography/hazmat/backends/openssl/backend.py b/src/cryptography/hazmat/backends/openssl/backend.py
index 58e7207..d42220f 100644
--- a/src/cryptography/hazmat/backends/openssl/backend.py
+++ b/src/cryptography/hazmat/backends/openssl/backend.py
@@ -2383,12 +2383,15 @@ class Backend:
_Reasons.UNSUPPORTED_SERIALIZATION,
)
- certs: list[x509.Certificate] = []
if p7.d.sign == self._ffi.NULL:
- return certs
+ raise ValueError(
+ "The provided PKCS7 has no certificate data, but a cert "
+ "loading method was called."
+ )
sk_x509 = p7.d.sign.cert
num = self._lib.sk_X509_num(sk_x509)
+ certs: list[x509.Certificate] = []
for i in range(num):
x509 = self._lib.sk_X509_value(sk_x509, i)
self.openssl_assert(x509 != self._ffi.NULL)
diff --git a/tests/hazmat/primitives/test_pkcs7.py b/tests/hazmat/primitives/test_pkcs7.py
index d8170bf..44c1d8d 100644
--- a/tests/hazmat/primitives/test_pkcs7.py
+++ b/tests/hazmat/primitives/test_pkcs7.py
@@ -89,11 +89,11 @@ class TestPKCS7Loading:
mode="rb",
)
- def test_load_pkcs7_empty_certificates(self, backend):
+ def test_load_pkcs7_empty_certificates(self):
der = b"\x30\x0B\x06\x09\x2A\x86\x48\x86\xF7\x0D\x01\x07\x02"
- certificates = pkcs7.load_der_pkcs7_certificates(der)
- assert certificates == []
+ with pytest.raises(ValueError):
+ pkcs7.load_der_pkcs7_certificates(der)
# We have no public verification API and won't be adding one until we get
--
2.33.0

7
python-cryptography.spec
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@ -1,7 +1,7 @@
%global pypi_name cryptography
Name: python-%{pypi_name}
Version: 40.0.2
Release: 3
Release: 4
Summary: PyCA's cryptography library
License: ASL 2.0 or BSD
URL: https://cryptography.io/en/latest/
@ -10,7 +10,9 @@ Source1: cargo-vendor-cache.tar.gz
Patch6002: backport-provide-openssl-apis-related-to-SM-for-python.patch
Patch6003: backport-CVE-2023-38325.patch
# CVE-2023-49083
Patch6004: backport-Fixed-crash-when-loading-a-PKCS-7-bundle-with-no-certificates.patch
Patch6005: backport-raise-an-exception-instead-of-returning-an-empty-list-for-pkcs7-cert-loading.patch
BuildRequires: openssl-devel cargo
BuildRequires: gcc
@ -87,6 +89,9 @@ EOF
%doc README.rst docs
%changelog
* Sat Dec 2 2023 liningjie <liningjie@xfusion.com> - 40.0.2-4
- raise an exception instead of returning an empty list for pkcs7 cert loading
* Wed Nov 29 2023 liningjie <liningjie@xfusion.com> - 40.0.2-3
- Fixed crash when loading a PKCS#7 bundle with no certificates