After upgrade of one of my servers to F33, I noticed that I can not ssh to
one of my other servers running Debian 9 system (relatively freshly EOLed,
I need to do something about it). On F33 I always need to:
$ ssh -oPubkeyAcceptedKeyTypes=+ssh-rsa user@debian-9-host
The changes in Fedora packages led me to:
https://gitlab.com/redhat-crypto/fedora-crypto-policies/-/commit/b298a9e1
Which led me to:
https://fedoraproject.org/wiki/Changes/StrongCryptoSettings2
I'm curious about the effects of the change. It claims that RSA 2048 >= should
stay accepted by DEFAULT, and from what I can tell the host server key seems to
be RSA 2048 (at least that's what is generated by default on Debian 9):
$ ssh-keygen -l -f ssh_host_rsa_key.pub
2048 SHA256:<...> root@debian-9-host (RSA)
Can anyone translate to me if this is really expected or a bug? Effect is that
Fedora 33 clients can not ssh to Debian 9 hosts by default (I'm not sure about
the supported Debian 10, and the key quality there).
Pavel