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Posted to dev@mina.apache.org by "Chris Danis (Jira)" <ji...@apache.org> on 2021/03/04 17:35:00 UTC
[jira] [Commented] (SSHD-1118) Unable to connect with Fedora 33
which has dropped ssh-rsa from PubkeyAcceptedKeyTypes
[ https://issues.apache.org/jira/browse/SSHD-1118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17295469#comment-17295469 ]
Chris Danis commented on SSHD-1118:
-----------------------------------
{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.
{quote}
It will soon be an issue for the compatibility of MINA SSHD with all OpenSSH clients (who use RSA keys).
Per the [OpenSSH release notes|https://www.openssh.com/releasenotes.html] since OpenSSH 6.9 (2015-07-01), the {{ssh-rsa}} over-the-wire key verification algorithm is deprecated and slated to be removed in a future release.
Fedora has simply made this change a bit early.
> 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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