br v2

modules/essentials/default.nix

@@ -7,6 +7,7 @@
     ./packages.nix
     ./services.nix
     ./settings.nix
+    ./ssh.nix
     ./systemd-routines.nix
     ./shell.nix
   ];

modules/essentials/services.nix

@@ -1,13 +1,15 @@
 {
-  config,
-  inputs,
   lib,
-  pkgs,
   xlib,
   ...
 }:
 {
-  services = {
-    tailscale.enable = xlib.device.type != "wsl"; # true, if not wsl
-  };
+  services.tailscale.enable = xlib.device.type != "wsl"; # true, if not wsl
+
+  # All real hosts (not the bare "minimal" test config) get OOM protection
+  # and a bounded journal.
+  services.earlyoom.enable = lib.mkIf (xlib.device.type != "minimal") true;
+  services.journald.extraConfig = lib.mkIf (xlib.device.type != "minimal") ''
+    SystemMaxUse=512M
+  '';
 }

modules/essentials/ssh.nix

@@ -0,0 +1,23 @@
+{
+  config,
+  lib,
+  ...
+}:
+lib.mkIf config.xlib.ssh.enable {
+  services.openssh = {
+    enable = true;
+    allowSFTP = true;
+    openFirewall = lib.mkDefault false;
+    hostKeys = [
+      {
+        path = "/etc/ssh/id_ed25519";
+        type = "ed25519";
+      }
+    ];
+    settings = {
+      PasswordAuthentication = false;
+      PermitRootLogin = "yes";
+      UsePAM = true;
+    };
+  };
+}