Re: Fedora 33 - ssh clients - drop of PubkeyAcceptedKeyTypes=ssh-rsa

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On Tue, Sep 22, 2020 at 8:40 AM Pavel Raiskup <praiskup@xxxxxxxxxx> wrote:

> > I hit that two week ago for bitbucket and other servers. In my case I got it
> > connecting to lyx git server. At the time I wrote about it in the fedora-test
> > mailing list.
> >
> > My workaround solution was to add to ~/.ssh/config
> >
> > Host *
> >   PubkeyAcceptedKeyTypes +rsa-sha2-256,rsa-sha2-512
>
> Tomáš, is this an expected feature or a bug in F33?  What are servers like
> BitBucket expected to do to comply with F33 clients?

Yes it is a feature of Fedora 33. It requires services to use better
algorithms than SHA-1 which is considered broken today. This is
described in the changes that Tomas is driving at:
https://fedoraproject.org/wiki/Changes/StrongCryptoSettings2

In this particular case I believe you have identified a bug in
bitbucket's ssh setup. They are using old SSH infrastructure that can
only do SHA-1. You may want to contact them about this.

regards,
Nikos
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