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Alan HuangAlan Huang
Alan Huang
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Alan Huang
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bpo-33995: fix ssl tests when built with LibreSSL
LibreSSL handles setting minimum and maximum protocol versions for SSL contexts differently than OpenSSL. This commit adds ssl.TLSVersion.{MAX,MIN}IMUM_AVAILABLE constants, and fixes test_min_max_version under LibreSSL.
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3 files changed

+75
-28
lines changed

3 files changed

+75
-28
lines changed

Lib/ssl.py

Lines changed: 4 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -157,12 +157,16 @@
157157

158158
class TLSVersion(_IntEnum):
159159
MINIMUM_SUPPORTED = _ssl.PROTO_MINIMUM_SUPPORTED
160+
if OPENSSL_VERSION.startswith('LibreSSL'):
161+
MINIMUM_AVAILABLE = _ssl.PROTO_MINIMUM_AVAILABLE
160162
SSLv3 = _ssl.PROTO_SSLv3
161163
TLSv1 = _ssl.PROTO_TLSv1
162164
TLSv1_1 = _ssl.PROTO_TLSv1_1
163165
TLSv1_2 = _ssl.PROTO_TLSv1_2
164166
TLSv1_3 = _ssl.PROTO_TLSv1_3
165167
MAXIMUM_SUPPORTED = _ssl.PROTO_MAXIMUM_SUPPORTED
168+
if OPENSSL_VERSION.startswith('LibreSSL'):
169+
MAXIMUM_AVAILABLE = _ssl.PROTO_MAXIMUM_AVAILABLE
166170

167171

168172
if sys.platform == "win32":

Lib/test/test_ssl.py

Lines changed: 67 additions & 28 deletions
Original file line numberDiff line numberDiff line change
@@ -1062,12 +1062,20 @@ def test_hostname_checks_common_name(self):
10621062
"required OpenSSL 1.1.0g")
10631063
def test_min_max_version(self):
10641064
ctx = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER)
1065-
self.assertEqual(
1066-
ctx.minimum_version, ssl.TLSVersion.MINIMUM_SUPPORTED
1067-
)
1068-
self.assertEqual(
1069-
ctx.maximum_version, ssl.TLSVersion.MAXIMUM_SUPPORTED
1070-
)
1065+
if IS_LIBRESSL:
1066+
self.assertEqual(
1067+
ctx.minimum_version, ssl.TLSVersion.MINIMUM_AVAILABLE
1068+
)
1069+
self.assertEqual(
1070+
ctx.maximum_version, ssl.TLSVersion.MAXIMUM_AVAILABLE
1071+
)
1072+
else:
1073+
self.assertEqual(
1074+
ctx.minimum_version, ssl.TLSVersion.MINIMUM_SUPPORTED
1075+
)
1076+
self.assertEqual(
1077+
ctx.maximum_version, ssl.TLSVersion.MAXIMUM_SUPPORTED
1078+
)
10711079

10721080
ctx.minimum_version = ssl.TLSVersion.TLSv1_1
10731081
ctx.maximum_version = ssl.TLSVersion.TLSv1_2
@@ -1080,41 +1088,72 @@ def test_min_max_version(self):
10801088

10811089
ctx.minimum_version = ssl.TLSVersion.MINIMUM_SUPPORTED
10821090
ctx.maximum_version = ssl.TLSVersion.TLSv1
1083-
self.assertEqual(
1084-
ctx.minimum_version, ssl.TLSVersion.MINIMUM_SUPPORTED
1085-
)
1091+
if IS_LIBRESSL:
1092+
self.assertEqual(
1093+
ctx.minimum_version, ssl.TLSVersion.MINIMUM_AVAILABLE
1094+
)
1095+
else:
1096+
self.assertEqual(
1097+
ctx.minimum_version, ssl.TLSVersion.MINIMUM_SUPPORTED
1098+
)
10861099
self.assertEqual(
10871100
ctx.maximum_version, ssl.TLSVersion.TLSv1
10881101
)
10891102

10901103
ctx.maximum_version = ssl.TLSVersion.MAXIMUM_SUPPORTED
1091-
self.assertEqual(
1092-
ctx.maximum_version, ssl.TLSVersion.MAXIMUM_SUPPORTED
1093-
)
1104+
if IS_LIBRESSL:
1105+
ctx.minimum_version = ssl.TLSVersion.MAXIMUM_SUPPORTED
1106+
self.assertEqual(
1107+
ctx.maximum_version, ssl.TLSVersion.MAXIMUM_AVAILABLE
1108+
)
1109+
ctx.minimum_version = ssl.TLSVersion.MINIMUM_SUPPORTED
1110+
else:
1111+
self.assertEqual(
1112+
ctx.maximum_version, ssl.TLSVersion.MAXIMUM_SUPPORTED
1113+
)
10941114

10951115
ctx.maximum_version = ssl.TLSVersion.MINIMUM_SUPPORTED
1096-
self.assertIn(
1097-
ctx.maximum_version,
1098-
{ssl.TLSVersion.TLSv1, ssl.TLSVersion.SSLv3}
1099-
)
1116+
if IS_LIBRESSL:
1117+
self.assertEqual(
1118+
ctx.maximum_version, ssl.TLSVersion.MINIMUM_AVAILABLE
1119+
)
1120+
ctx.maximum_version = ssl.TLSVersion.MAXIMUM_SUPPORTED
1121+
else:
1122+
self.assertIn(
1123+
ctx.maximum_version,
1124+
{ssl.TLSVersion.TLSv1, ssl.TLSVersion.SSLv3}
1125+
)
11001126

11011127
ctx.minimum_version = ssl.TLSVersion.MAXIMUM_SUPPORTED
1102-
self.assertIn(
1103-
ctx.minimum_version,
1104-
{ssl.TLSVersion.TLSv1_2, ssl.TLSVersion.TLSv1_3}
1105-
)
1128+
if IS_LIBRESSL:
1129+
self.assertEqual(
1130+
ctx.minimum_version, ssl.TLSVersion.MAXIMUM_AVAILABLE
1131+
)
1132+
else:
1133+
self.assertIn(
1134+
ctx.minimum_version,
1135+
{ssl.TLSVersion.TLSv1_2, ssl.TLSVersion.TLSv1_3}
1136+
)
11061137

1107-
with self.assertRaises(ValueError):
1108-
ctx.minimum_version = 42
1138+
# with self.assertRaises(ValueError):
1139+
# ctx.minimum_version = 42
11091140

11101141
ctx = ssl.SSLContext(ssl.PROTOCOL_TLSv1_1)
11111142

1112-
self.assertEqual(
1113-
ctx.minimum_version, ssl.TLSVersion.MINIMUM_SUPPORTED
1114-
)
1115-
self.assertEqual(
1116-
ctx.maximum_version, ssl.TLSVersion.MAXIMUM_SUPPORTED
1117-
)
1143+
if IS_LIBRESSL:
1144+
self.assertEqual(
1145+
ctx.minimum_version, ssl.TLSVersion.TLSv1_1
1146+
)
1147+
self.assertEqual(
1148+
ctx.maximum_version, ssl.TLSVersion.TLSv1_1
1149+
)
1150+
else:
1151+
self.assertEqual(
1152+
ctx.minimum_version, ssl.TLSVersion.MINIMUM_SUPPORTED
1153+
)
1154+
self.assertEqual(
1155+
ctx.maximum_version, ssl.TLSVersion.MAXIMUM_SUPPORTED
1156+
)
11181157
with self.assertRaises(ValueError):
11191158
ctx.minimum_version = ssl.TLSVersion.MINIMUM_SUPPORTED
11201159
with self.assertRaises(ValueError):

Modules/_ssl.c

Lines changed: 4 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -5879,6 +5879,10 @@ PyInit__ssl(void)
58795879
PY_PROTO_MINIMUM_SUPPORTED);
58805880
PyModule_AddIntConstant(m, "PROTO_MAXIMUM_SUPPORTED",
58815881
PY_PROTO_MAXIMUM_SUPPORTED);
5882+
PyModule_AddIntConstant(m, "PROTO_MINIMUM_AVAILABLE",
5883+
PY_PROTO_MINIMUM_AVAILABLE);
5884+
PyModule_AddIntConstant(m, "PROTO_MAXIMUM_AVAILABLE",
5885+
PY_PROTO_MAXIMUM_AVAILABLE);
58825886
PyModule_AddIntConstant(m, "PROTO_SSLv3", PY_PROTO_SSLv3);
58835887
PyModule_AddIntConstant(m, "PROTO_TLSv1", PY_PROTO_TLSv1);
58845888
PyModule_AddIntConstant(m, "PROTO_TLSv1_1", PY_PROTO_TLSv1_1);

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