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feat(servers): declare SSH authorizedKeys + root mac admin trust 🔑

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Move the imperative SSH-key-related scars accumulated during the
clan/VPS rollout into nix config so future installs and rebuilds
reproduce the same state:

- danny@sunken-ship + danny@phantom-ship: trust the mac admin key
  (id_ed25519_<host> on Daniel-Macbook-Air) and the host's own
  self-loopback key (used by clan ssh-ng:// nix-copy-closure back
  to the same host during `clan machines update`).
- root@sunken-ship + root@phantom-ship: trust the mac admin key so
  `clan machines update` can run its SOPS-key upload step that
  SSHes to root@<host> to write /var/lib/sops-nix/key.txt.

Existing key files (~/.ssh/id_ed25519 on each host) stay where they
are; the keypair was generated once during initial bootstrap and the
public side is now declared above. Reinstalls would regenerate and
need the pubkey re-pinned here.
This commit is contained in:
DannyDannyDanny 2026-04-25 13:30:40 +02:00
parent 644420481e
commit b8bc17f385
2 changed files with 26 additions and 2 deletions
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16
nixos/hosts/sunken-ship.nix
View file

@ -39,10 +39,22 @@
users.users.danny = {
isNormalUser = true;
extraGroups = [ "wheel" "video" "audio" ]; # video: backlight; audio: sound devices
# SSH keys: push via scp, don't commit. NixOS does not manage authorized_keys so scp'd keys persist.
# Example: scp ~/.ssh/id_ed25519_sunken_ship.pub danny@server:/tmp/ then on server: mkdir -p ~/.ssh; cat /tmp/*.pub >> ~/.ssh/authorized_keys
openssh.authorizedKeys.keys = [
# Mac admin (~/.ssh/id_ed25519_sunken_ship on Daniel-Macbook-Air).
"ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIKW/akfIiVU5o63YrTAJVZhMj7kXfYHOnXDtlpVFW7pf danny@sunken-ship"
# Self-loopback (used by clan ssh-ng:// during nix-copy-closure
# back to this same host on `clan machines update`). Pubkey of the
# /home/danny/.ssh/id_ed25519 that lives on this host.
"ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIB9t4YAaoHvVouqp+qyFOq8o3SAtXMiAmjF6J0ldyx4g danny@sunken-ship self"
];
};
# root needs the mac admin key so `clan machines update` can SSH to
# root@<host> to upload SOPS keys (sops-install-secrets bootstrap).
users.users.root.openssh.authorizedKeys.keys = [
"ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIKW/akfIiVU5o63YrTAJVZhMj7kXfYHOnXDtlpVFW7pf danny@sunken-ship"
];
# Key-only auth; no password or keyboard-interactive.
services.openssh = {
enable = true;