Fix ssl.SSLError: [ASN1: NOT_ENOUGH_DATA] not enough data with OpenSSL 3.5.7+

00489-openssl-3.5.7.patch

@@ -0,0 +1,75 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: David Benjamin <davidben@google.com>
+Date: Fri, 24 Mar 2023 09:04:30 -0400
+Subject: 00489: Use BIO_eof to detect EOF for SSL_FILETYPE_ASN1
+
+In PEM, we need to parse until error and then suppress `PEM_R_NO_START_LINE`, because PEM allows arbitrary leading and trailing data. DER, however, does not. Parsing until error and suppressing `ASN1_R_HEADER_TOO_LONG` doesn't quite work because that error also covers some cases that should be rejected.
+
+Instead, check `BIO_eof` early and stop the loop that way.
+
+This fixes https://github.com/python/cpython/issues/151504 and adds compatibility with OpenSSL 3.5.7+
+
+(cherry-picked from commit acfe02f3b05436658d92add6b168538b30f357f0)
+---
+ Lib/test/test_ssl.py                                   |  2 ++
+ .../2022-12-20-10-55-14.gh-issue-100372.utfP65.rst     |  2 ++
+ Modules/_ssl.c                                         | 10 ++++++----
+ 3 files changed, 10 insertions(+), 4 deletions(-)
+ create mode 100644 Misc/NEWS.d/next/Library/2022-12-20-10-55-14.gh-issue-100372.utfP65.rst
+
+diff --git a/Lib/test/test_ssl.py b/Lib/test/test_ssl.py
+index ce40b09bb6..32854853d3 100644
+--- a/Lib/test/test_ssl.py
++++ b/Lib/test/test_ssl.py
+@@ -1204,6 +1204,8 @@ class ContextTests(unittest.TestCase):
+             "not enough data: cadata does not contain a certificate"
+         ):
+             ctx.load_verify_locations(cadata=b"broken")
++        with self.assertRaises(ssl.SSLError):
++            ctx.load_verify_locations(cadata=cacert_der + b"A")
+ 
+     def test_load_dh_params(self):
+         ctx = ssl.SSLContext(ssl.PROTOCOL_TLSv1)
+diff --git a/Misc/NEWS.d/next/Library/2022-12-20-10-55-14.gh-issue-100372.utfP65.rst b/Misc/NEWS.d/next/Library/2022-12-20-10-55-14.gh-issue-100372.utfP65.rst
+new file mode 100644
+index 0000000000..ec37aff509
+--- /dev/null
++++ b/Misc/NEWS.d/next/Library/2022-12-20-10-55-14.gh-issue-100372.utfP65.rst
+@@ -0,0 +1,2 @@
++:meth:`ssl.SSLContext.load_verify_locations` no longer incorrectly accepts
++some cases of trailing data when parsing DER.
+diff --git a/Modules/_ssl.c b/Modules/_ssl.c
+index ab8a327d10..d31e1960ec 100644
+--- a/Modules/_ssl.c
++++ b/Modules/_ssl.c
+@@ -3658,7 +3658,7 @@ _add_ca_certs(PySSLContext *self, void *data, Py_ssize_t len,
+ {
+     BIO *biobuf = NULL;
+     X509_STORE *store;
+-    int retval = -1, err, loaded = 0;
++    int retval = -1, err, loaded = 0, was_bio_eof = 0;
+ 
+     assert(filetype == SSL_FILETYPE_ASN1 || filetype == SSL_FILETYPE_PEM);
+ 
+@@ -3686,6 +3686,10 @@ _add_ca_certs(PySSLContext *self, void *data, Py_ssize_t len,
+         int r;
+ 
+         if (filetype == SSL_FILETYPE_ASN1) {
++            if (BIO_eof(biobuf)) {
++                was_bio_eof = 1;
++                break;
++            }
+             cert = d2i_X509_bio(biobuf, NULL);
+         } else {
+             cert = PEM_read_bio_X509(biobuf, NULL,
+@@ -3721,9 +3725,7 @@ _add_ca_certs(PySSLContext *self, void *data, Py_ssize_t len,
+         }
+         _setSSLError(msg, 0, __FILE__, __LINE__);
+         retval = -1;
+-    } else if ((filetype == SSL_FILETYPE_ASN1) &&
+-                    (ERR_GET_LIB(err) == ERR_LIB_ASN1) &&
+-                    (ERR_GET_REASON(err) == ASN1_R_HEADER_TOO_LONG)) {
++    } else if ((filetype == SSL_FILETYPE_ASN1) && was_bio_eof) {
+         /* EOF ASN1 file, not an error */
+         ERR_clear_error();
+         retval = 0;

python3.6.spec

@@ -17,7 +17,7 @@ URL: https://www.python.org/
 #global prerel ...
 %global upstream_version %{general_version}%{?prerel}
 Version: %{general_version}%{?prerel:~%{prerel}}
-Release: 57%{?dist}
+Release: 58%{?dist}
 # Python is Python
 # pip MIT is and bundles:
 #   appdirs: MIT
@@ -943,6 +943,18 @@ Patch480: 00480-cve-2026-4786.patch
 # Backported from Python 3.10
 Patch482: 00482-cve-2026-6100.patch
 
+# 00489 # 00bd500a6c87df569b281458d878bebbebdd9a0c
+# Use BIO_eof to detect EOF for SSL_FILETYPE_ASN1
+#
+# In PEM, we need to parse until error and then suppress `PEM_R_NO_START_LINE`, because PEM allows arbitrary leading and trailing data. DER, however, does not. Parsing until error and suppressing `ASN1_R_HEADER_TOO_LONG` doesn't quite work because that error also covers some cases that should be rejected.
+#
+# Instead, check `BIO_eof` early and stop the loop that way.
+#
+# This fixes https://github.com/python/cpython/issues/151504 and adds compatibility with OpenSSL 3.5.7+
+#
+# (cherry-picked from commit acfe02f3b05436658d92add6b168538b30f357f0)
+Patch489: 00489-openssl-3.5.7.patch
+
 # (New patches go here ^^^)
 #
 # When adding new patches to "python" and "python3" in Fedora, EL, etc.,
@@ -2244,6 +2256,9 @@ CheckPython optimized
 # ======================================================
 
 %changelog
+* Thu Jul 02 2026 Miro Hrončok <mhroncok@redhat.com> - 3.6.15-58
+- Fix ssl.SSLError: [ASN1: NOT_ENOUGH_DATA] not enough data with OpenSSL 3.5.7+
+
 * Fri Apr 17 2026 Charalampos Stratakis <cstratak@redhat.com> - 3.6.15-57
 - Security fixes for CVE-2026-4786, CVE-2026-6100
 Resolves: rhbz#2458018, rhbz#2458226