Ian Wienand created SSHD-1118:
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Summary: Unable to connect with Fedora 33 which has dropped
ssh-rsa from PubkeyAcceptedKeyTypes
Key: SSHD-1118
URL: https://issues.apache.org/jira/browse/SSHD-1118
Project: MINA SSHD
Issue Type: Bug
Affects Versions: 2.4.0
Reporter: Ian Wienand
This problem was noted with Gerrit using a 2.4.0 mina sshd server [1] after a
recent upgrade. Some users using Fedora 33 started being not able to log in.
It turns out that Fedora >=33 has dropped rsa-ssh from it's default
PubkeyAcceptedKeyTypes in /etc/crypto-policies/back-ends/openssh.config. You
either have to modify your policy globally to "legacy" with
"update-crypto-policies" or manually set PubkeyAcceptedKeyTypes=ssh-rsa for
failing servers.
I understand that server-sig-algs support isn't fully implemented in mina sshd
as yet, so the client will not be seeing the negotiation list.--
However, it seems rsa-sha2-256/512 are supported? It seems like forcing this
with {{ssh oPubkeyAcceptedKeyTypes=rsa-sha2-512}} should work, but it does not
(see related gerrit bug)?
I can provide ssh connect logs, etc. if it will help; at this point I think
it's mostly about understanding Fedora's change and any mina limitations so we
can find the best solution for users. Although Fedora 33 users are obviously a
small minority now, it probably flags something other distros will take up
sooner or later.
Thanks!
[1] https://bugs.chromium.org/p/gerrit/issues/detail?id=13930
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