"No protocols available" on Ubuntu 20.04 #36
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…l be used tlsv1 and tlsv1_1 are insecure, deprecated and no longer available on Ubuntu as of 20.04
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Please review this pull request. I know other people are finding a requirement for this change. |
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I received the above error message using LuaIRC with the Minetest IRC mod. Because I am only able to configure
secureas a booleantrueand not with a table specifyingprotocolI have come up with this small change to LuaIRC which I think benefits many users and leaves no users disadvantaged.tlsv1andtlsv1_1are insecure, deprecated and no longer available on Ubuntu as of 20.04 so hardcodingtlsv1as a default is a bad idea. This pull request fixes the problem by not specifying the protocol version. LuaIRC will now use the highest TLS version available. Usingprotocol = "any"is also used in the client example for Luasec at https://github.com/brunoos/luasec/wiki . Luasec itself changed from "tlsv1" to "any" in version 0.6 as the default for https connections.To diagnose the problem, I used openssl to check what protocols were available. TLSv1 and TLSv1.1 worked on MacOS 10.14 but not on Ubuntu 20.04 as can be seen by the failure of these commands on Ubuntu.
TLSv1.2 and TLSv1.3 worked on both MacOS 10.14 and Ubuntu 20.04 as can be seen by the success of these commands.
Deprecating TLSv1 and TLSv1.1 is recommended by this IETF RFC https://datatracker.ietf.org/doc/draft-ietf-tls-oldversions-deprecate/ . The RFC also recommends that clients specify their highest supported protocol.