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From "Lyor Goldstein (Jira)" <j...@apache.org>
Subject [jira] [Commented] (SSHD-1118) Unable to connect with Fedora 33 which has dropped ssh-rsa from PubkeyAcceptedKeyTypes
Date Thu, 14 Jan 2021 18:10:01 GMT

    [ https://issues.apache.org/jira/browse/SSHD-1118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17265096#comment-17265096
] 

Lyor Goldstein commented on SSHD-1118:
--------------------------------------

I hope I understand it better now - which begs the question why insist on an RSA signature
? Why not use one of the {{ecdsa-sha2-nistp256/ecdsa-sha2-nistp384/ecdsa-sha2-nistp521}} or
{{ssh-ed25519}} - all of which are supported by MINA SSHD.

> 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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