feat: init

modules/nixos/core/ssh/default.nix

@@ -0,0 +1,58 @@
+{
+  flake,
+  config,
+  ...
+}:
+let
+  inherit (flake.config.people)
+    user0
+    user1
+    user2
+    user3
+    ;
+  inherit (flake.config.machines)
+    devices
+    ;
+  hostname = config.networking.hostName;
+  mars = devices.mars.name;
+  deimos = devices.deimos.name;
+  ceres = devices.ceres.name;
+  venus = devices.venus.name;
+  charon = devices.charon.name;
+
+  # Helper function to get SSH keys for a specific user
+  getUserKeys = user: flake.config.people.users.${user}.sshKeys;
+in
+{
+  users.users =
+    if hostname == charon then
+      { }
+    else if hostname == mars then
+      {
+        ${user0} = {
+          openssh.authorizedKeys.keys = getUserKeys user0;
+        };
+        ${user3} = {
+          openssh.authorizedKeys.keys = getUserKeys user3;
+        };
+      }
+    else if
+      builtins.elem hostname [
+        deimos
+        ceres
+      ]
+    then
+      {
+        ${user0} = {
+          openssh.authorizedKeys.keys = getUserKeys user0;
+        };
+      }
+    else if hostname == venus then
+      {
+        ${user2} = {
+          openssh.authorizedKeys.keys = getUserKeys user2;
+        };
+      }
+    else
+      { };
+}