[pve-devel] [PATCH cluster/manager/storage/docs 0/9] fix #4886: improve SSH handling

[Fabian Grünbichler]

On January 11, 2024 11:51 am, Fabian Grünbichler wrote:
> this series replaces the old mechanism that used a cluster-wide merged known
> hosts file with distributing of each node's host key via pmxcfs, and pinning
> the distributed key explicitly for internal SSH connections.
> 
> the main changes in pve-cluster somewhat break the old manager and
> storage versions, but only when such a partial upgrade is mixed with a
> host key rotation of some sort.
> 
> pve-storage uses a newly introduced helper, so needs a versioned
> dependency accordingly.
> 
> the last pve-docs patch has a placeholder for the actual version shipping the
> changes which needs to be replaced when applying.
> 
> there's still some potential for follow-ups:
> - 'pvecm ssh' wrapper to debug and/or re-use the host key pinning (and other
>   future changes)
> - also add non-RSA host keys
> - key (and thus authorized keys) and/or sshd disentangling (this
>   potentially also affects external access, so might be done on a major
>   release to give more heads up)

and one fixup that I just realized thanks to talking to Hannes D. - the
cluster create API call will also merge the known hosts, that call
should also be removed if we remove it from `pvecm updatecerts`.