BBS:      TELESC.NET.BR
Assunto:  Broken SSH implementation
De:       Winzlo
Data:     Tue, 12 May 2026 01:45:12 -0500
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Hi, all.  I'm running Mystic 1.12a48 on Linux64 and did some comprehensive testing on cryptlib.  So far, cryptlib 3.4.5 is the only version that will create a ssl.cert file in the data directory.  So, using that file, I tested every version of cryptlib from 3.4.5 to 3.4.9-1, compiled both in gcc-9, and gcc-13, then copied the built library into /mystic/libs/libcl.so.  In all cases but 3.4.5, the ssh connection is closd immediately after it opens.

cryptlib 3.4.5 works, but only if you downgrade your ssh client to use aes256-cec as the cypher specification.  Because that spec was replaced in later versions of cryptlib, it appears that Mystic is unable to properly initialize the ssh session.

Has anyone encountered this, and if not, how can we get the author to at very lease provide a patched MysticBBS so that users on modern ssh clients can connect to modern BBS's?

Thanks for your help!

-Winzlo

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