Re: Landing a larger-than-release change (distrusting SHA-1 signatures)

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On Wed, Mar 9, 2022 at 2:47 PM Richard W.M. Jones <rjones@xxxxxxxxxx> wrote:
>
> Previous tightening of crypto defaults caused problems with us
> connecting to older ssh servers.
>
> I am particularly interested / worried about sshd from RHEL 5, 6 & 7
> for virt-p2v and virt-v2v conversions.  This broke before, requiring
> us to advise users to set the global policy for the machine to LEGACY
> (thus ironically weakening crypto for everything).
>
> Also I have some ancient network equipment that cannot be upgraded but
> needs older ssh protocols.  I can't connect to it from Fedora unless I
> set the crypto policy to LEGACY.
>
> Anyway I'm wondering if the SHA-1 change will impact ssh further?

IIRC, the only SHA-1 thing that should be left in DEFAULT for SSH
is SHA-1 as HMAC, which doesn't rely on collision resistance.
So, not this round.

> Rich.
>
> --
> Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
> Read my programming and virtualization blog: http://rwmj.wordpress.com
> virt-df lists disk usage of guests without needing to install any
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> http://people.redhat.com/~rjones/virt-df/
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