Fix CVE-2023-23931 and FTBFS

Don't allow update_into to mutate immutable objects, resolves rhbz#2171820
Fix FTBFS due to failing test_load_invalid_ec_key_from_pem and test_decrypt_invalid_decrypt, resolves rhbz#2171661

CVE-2023-23931.patch

@@ -0,0 +1,42 @@
+From 94a50a9731f35405f0357fa5f3b177d46a726ab3 Mon Sep 17 00:00:00 2001
+From: Alex Gaynor <alex.gaynor@gmail.com>
+Date: Tue, 31 Jan 2023 08:33:54 -0500
+Subject: [PATCH] Don't allow update_into to mutate immutable objects
+
+---
+ src/cryptography/hazmat/backends/openssl/ciphers.py | 2 +-
+ tests/hazmat/primitives/test_ciphers.py             | 8 ++++++++
+ 2 files changed, 9 insertions(+), 1 deletion(-)
+
+diff --git a/src/cryptography/hazmat/backends/openssl/ciphers.py b/src/cryptography/hazmat/backends/openssl/ciphers.py
+index 286583f9325..075d68fb905 100644
+--- a/src/cryptography/hazmat/backends/openssl/ciphers.py
++++ b/src/cryptography/hazmat/backends/openssl/ciphers.py
+@@ -156,7 +156,7 @@ def update_into(self, data: bytes, buf: bytes) -> int:
+         data_processed = 0
+         total_out = 0
+         outlen = self._backend._ffi.new("int *")
+-        baseoutbuf = self._backend._ffi.from_buffer(buf)
++        baseoutbuf = self._backend._ffi.from_buffer(buf, require_writable=True)
+         baseinbuf = self._backend._ffi.from_buffer(data)
+ 
+         while data_processed != total_data_len:
+diff --git a/tests/hazmat/primitives/test_ciphers.py b/tests/hazmat/primitives/test_ciphers.py
+index 02127dd9cab..bf3b047dec2 100644
+--- a/tests/hazmat/primitives/test_ciphers.py
++++ b/tests/hazmat/primitives/test_ciphers.py
+@@ -318,6 +318,14 @@ def test_update_into_buffer_too_small(self, backend):
+         with pytest.raises(ValueError):
+             encryptor.update_into(b"testing", buf)
+ 
++    def test_update_into_immutable(self, backend):
++        key = b"\x00" * 16
++        c = ciphers.Cipher(AES(key), modes.ECB(), backend)
++        encryptor = c.encryptor()
++        buf = b"\x00" * 32
++        with pytest.raises((TypeError, BufferError)):
++            encryptor.update_into(b"testing", buf)
++
+     @pytest.mark.supported(
+         only_if=lambda backend: backend.cipher_supported(
+             AES(b"\x00" * 16), modes.GCM(b"\x00" * 12)

python-cryptography.spec

@@ -6,7 +6,7 @@
 
 Name:           python-%{srcname}
 Version:        37.0.2
-Release:        7%{?dist}
+Release:        8%{?dist}
 Summary:        PyCA's cryptography library
 
 # cryptography is dual licensed under the Apache-2.0 and BSD-3-Clause,
@@ -19,6 +19,9 @@ Source0:        https://github.com/pyca/cryptography/archive/%{version}/%{srcnam
 Source1:        cryptography-%{version}-vendor.tar.bz2
 Source2:        conftest-skipper.py
 
+# https://github.com/pyca/cryptography/pull/8230
+Patch1:         CVE-2023-23931.patch
+
 ExclusiveArch:  %{rust_arches}
 
 BuildRequires:  openssl-devel
@@ -113,9 +116,10 @@ export OPENSSL_ENABLE_SHA1_SIGNATURES=yes
 # see https://bugzilla.redhat.com/show_bug.cgi?id=1761194 for deselected tests
 # see rhbz#2042413 for memleak. It's unstable under Python 3.11 and makes
 # not much sense for downstream testing.
+# see rhbz#2171661 for test_load_invalid_ec_key_from_pem: error:030000CD:digital envelope routines::keymgmt export failure
 PYTHONPATH=${PWD}/vectors:%{buildroot}%{python3_sitearch} \
     %{__python3} -m pytest \
-    -k "not (test_buffer_protocol_alternate_modes or test_dh_parameters_supported or test_load_ecdsa_no_named_curve or test_openssl_memleak)"
+    -k "not (test_buffer_protocol_alternate_modes or test_dh_parameters_supported or test_load_ecdsa_no_named_curve or test_decrypt_invalid_decrypt or test_openssl_memleak or test_load_invalid_ec_key_from_pem)"
 %endif
 
 %files -n python%{python3_pkgversion}-%{srcname}
@@ -125,6 +129,10 @@ PYTHONPATH=${PWD}/vectors:%{buildroot}%{python3_sitearch} \
 %{python3_sitearch}/%{srcname}-%{version}-py*.egg-info
 
 %changelog
+* Wed Feb 22 2023 Christian Heimes <cheimes@redhat.com> - 37.0.2-8
+- Fix CVE-2023-23931: Don't allow update_into to mutate immutable objects, resolves rhbz#2171820
+- Fix FTBFS due to failing test_load_invalid_ec_key_from_pem and test_decrypt_invalid_decrypt, resolves rhbz#2171661
+
 * Fri Jan 20 2023 Fedora Release Engineering <releng@fedoraproject.org> - 37.0.2-7
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild