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[3.9] gh-121227: Disallow setting an empty list for NPN (GH-137161)

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Stan Ulbrych 2025-10-07 13:09:33 +01:00 • committed by GitHub
parent 312de66fb5
commit a2cdbb6e81
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Lib/ssl.py
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@ -520,6 +520,8 @@ def wrap_bio(self, incoming, outgoing, server_side=False,
def set_npn_protocols(self, npn_protocols):
protos = bytearray()
if not npn_protocols:
raise SSLError('NPN protocols must not be empty')
for protocol in npn_protocols:
b = bytes(protocol, 'ascii')
if len(b) == 0 or len(b) > 255: