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2024 Feb 05
0
Server-side algorithms selection
..._MSG_KEXINIT interesting things could be done, for
example the server checks KEX and kex-strict-c-v00 at openssh.com is not
found, it may not send chacha20-poly1305 at openssh.com
One common solution used in some servers is to associate algorithms to
client's initial banner (see for example SFTPClientMatch in ProFTPD).
This means that over time we will have ever-increasing association
lists, also the initial banner can be easily changed if you use one of
the many SSH libraries available, so this does not seem like such a
robust and easy to maintain solution.
Another option I have evaluated is to...