I'm also working on TLS 1.3 compatibility with Stunnel. I will reach the
mailing list as soon as possible with a tested patch.
Could you specify what problem do you have with TLS 1.3.
It works for me:
2018.03.13 11:39:06 LOG5[ui]: stunnel 5.44 on x86_64-unknown-linux-gnu
2018.03.13 11:39:06 LOG5[ui]: Compiled/running with OpenSSL
1.1.1-pre2-dev xx XXX xxxx
2018.03.13 11:39:23 LOG6: Negotiated TLSv1.3 ciphersuite
TLS13-AES-256-GCM-SHA384 (256-bit encryption)
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