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Posted on Monday July 19, 2021
I had to make an update to MoonGem, yesterday. I had been getting these TLS errors whenever I'd try to connect to my gemlog with TLS 1.3 enabled. I ignored it and switched to use 1.2 on my devices where possible. Someone pointed it out to me over email yesterday, so I thought it was worth looking into.
Apparently if you configure OpenSSL to use the SSL_VERIFY_PEER and SSL_VERIFY_CLIENT_ONCE options in verifying client certificates, this for some reason breaks a session caching feature of TLS that I wasn't aware existed.
Anyway, after disabling session resumption and renegotiation (Gemini clients shouldn't be using those things anyway) I found the issue had been resolved.
I should probably look into switching to a simpler TLS implementation library. I trust OpenSSL much less now that I know weird unintuitive things like this can occur.
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