profiles/common-ssh: Migrate common SSH config to profile and pin SSH public hosts keys for net.clerie.de

profiles/common-ssh/default.nix

@@ -0,0 +1,29 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+{
+
+  options.profiles.clerie.common-ssh = {
+    enable = mkEnableOption "Common ssh config";
+  };
+
+  config = mkIf config.profiles.clerie.common-ssh.enable {
+
+    services.openssh.enable = true;
+    services.openssh.settings = {
+      PasswordAuthentication = false;
+      KbdInteractiveAuthentication = false;
+      PermitRootLogin = lib.mkDefault "no";
+    };
+    services.openssh.hostKeys = lib.mkForce [
+      # Only create ed25519 host keys
+      { type = "ed25519"; path = "/etc/ssh/ssh_host_ed25519_key"; }
+    ];
+
+    programs.ssh.knownHostsFiles = [
+      (pkgs.clerie-ssh-known-hosts + "/known_hosts")
+    ];
+
+  };
+}