sslutil: don't set minimum TLS version to 1.0 if 1.2 but not 1.1 is available
This case isn't very likely, but possible, especially if supportedprotocols
gets fixed to contain only correct items (see the FIXME above in the file).
--- a/mercurial/sslutil.py Sun May 31 11:41:03 2020 +0200
+++ b/mercurial/sslutil.py Sun May 31 11:10:21 2020 +0200
@@ -105,7 +105,7 @@
# We default to TLS 1.1+ where we can because TLS 1.0 has known
# vulnerabilities (like BEAST and POODLE). We allow users to downgrade to
# TLS 1.0+ via config options in case a legacy server is encountered.
- if b'tls1.1' in supportedprotocols:
+ if supportedprotocols - {b'tls1.0'}:
defaultminimumprotocol = b'tls1.1'
else:
# Let people know they are borderline secure.