[pve-devel] [RFC cluster 0/2] fix #4886: improve SSH handling

Fabian Grünbichler f.gruenbichler at proxmox.com
Thu Dec 21 10:53:11 CET 2023

RFC since this would be a bigger change in how we approach intra-cluster
SSH access.

there are still a few parts that currently don't use SSHInfo, but
would need to be switched over if we want to pursue this approach:

- get_vnc_connection_info in PVE::API2::Nodes
- 'upload' API endpoint in PVE::API2::Storage::Status
- SSH proxy in pvesh

these changes would need to happen coordinated with the patches from
this RFC series!

next steps afterwards:
- unmerge known hosts in `pvecm updatecerts`, instead of merging
-- to disentangle regular ssh from intra-cluster SSH
-- to allow `ssh-keygen -f .. -R ..` to work properly again
-- existing keys would still be preserved for not-yet-upgraded nodes, so this
   should be do-able without waiting for a major release..
- evaluate whether we want to split out
-- the client config (we currently force a cipher order there)
-- the client key (could live in /etc/pve/priv instead?)
-- or even the sshd instance altogether (would allow not touching the
   regular sshd config at all)

Fabian Grünbichler (2):
  fix #4886: write node SSH hostkey to pmxcfs
  fix #4886: SSH: pin node's host key if available

 src/PVE/Cluster/Setup.pm | 15 +++++++++++++++
 src/PVE/SSHInfo.pm       | 15 ++++++++++++++-
 2 files changed, 29 insertions(+), 1 deletion(-)


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