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-rw-r--r--Lib/test/test_ssl.py11
1 files changed, 11 insertions, 0 deletions
diff --git a/Lib/test/test_ssl.py b/Lib/test/test_ssl.py
index 815475e..1c4aa7c 100644
--- a/Lib/test/test_ssl.py
+++ b/Lib/test/test_ssl.py
@@ -349,6 +349,17 @@ class BasicSocketTests(unittest.TestCase):
self.assertRaises(ValueError, ssl.match_hostname, None, 'example.com')
self.assertRaises(ValueError, ssl.match_hostname, {}, 'example.com')
+ # Issue #17980: avoid denials of service by refusing more than one
+ # wildcard per fragment.
+ cert = {'subject': ((('commonName', 'a*b.com'),),)}
+ ok(cert, 'axxb.com')
+ cert = {'subject': ((('commonName', 'a*b.co*'),),)}
+ ok(cert, 'axxb.com')
+ cert = {'subject': ((('commonName', 'a*b*.com'),),)}
+ with self.assertRaises(ssl.CertificateError) as cm:
+ ssl.match_hostname(cert, 'axxbxxc.com')
+ self.assertIn("too many wildcards", str(cm.exception))
+
def test_server_side(self):
# server_hostname doesn't work for server sockets
ctx = ssl.SSLContext(ssl.PROTOCOL_SSLv23)