Hey there, I've got another feature request :) I would like to be able to add something which looks like this to sshd_config: ``` Match PubkeyType ssh-ed25519-cert-v01@xxxxxxxxxxx, Address 123.123.0.0/16 AllowGroups ssh-cert-users Match PubkeyType sk-ssh-ed25519@xxxxxxxxxxx, Address 234.234.0.0/16 AllowGroups ssh-yubikey-users ``` For background, I already have something like this: ``` AllowGroups public-ssh Match Address 127.0.0.0/16,localhost,192.168.0.0/16,10.1.0.0/24 AllowGroups private-ssh root PermitRootLogin prohibit-password Match Address 10.0.0.0/8 AllowGroups private-ssh ``` So, someone in the private-ssh group usually needs to proxyjump through a public-ssh user (which has a very restricted account.) Now I want to relax it so that the private-sshers can bypass proxyjumping so long as they have a cert. I thought about something like this: ``` Match Group ssh-cert-users PubkeyAcceptedKeyTypes ssh-ed25519-cert-v01@xxxxxxxxxxx ``` But then (iiuc) they still won't be able to log in unless you give the match an AllowGroup: ``` Match Group ssh-cert-users AllowGroup ssh-cert-users PubkeyAcceptedKeyTypes ssh-ed25519-cert-v01@xxxxxxxxxxx ``` Which seems circular ... allow the group if they're in the group, what? And there are other possible complications, like what if they are in both ssh-cert-users and ssh-private, and they use different keys for different purposes? "Match Group" doesn't seem to provide the required flexibility. There could be other uses too, like before transitioning to a pure cert/sk setup, you can Match deprecated key types to provide those users with a Banner warning. "We will be disabling ssh-rsa and ssh-ed25519 on 2022-06-30. Please remember to switch to sk keys before then." So after circling around the problem for a while, I keep coming back to the same idea: it would be cool to be able to match the incoming key type, as I see a few interesting uses for this. Do you think it would be doable? Al _______________________________________________ openssh-unix-dev mailing list openssh-unix-dev@xxxxxxxxxxx https://lists.mindrot.org/mailman/listinfo/openssh-unix-dev
