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https://issues.apache.org/jira/browse/SSHD-1118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17265853#comment-17265853
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Lyor Goldstein commented on SSHD-1118:
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{quote}I guess we don't insist on it, but it means users have to regenerate
their keys that were working.
{quote}
This is true - however, bear in mind that this is prevailing recommendation in
the security community - so the sooner the better. Note that this affects not
only SSH but also TLS - many TLS libraries are deprecating and/or deleting RSA
support entirely.
{quote}better if we if we can find anything to keep existing keys working
{quote}
I agree, but I don't see how this is a MINA SSHD issue - by the very
description of the problem it is a Fedora issue. FYI, our code still supports
RSA - client and server (as of 2.6.0 the support is still there but must be
activated +explicitly+) so I am at a loss as to how we can help here.
> 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
> Priority: Major
>
> 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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