Add basic Samba config for the scanner

This allows the scanner to log into samba with its own username and
password.

quinn/etc/nixos/configuration.nix

@@ -58,6 +58,7 @@
   # Enable touchpad support (enabled default in most desktopManager).
   # services.libinput.enable = true;
 
+  users.groups.scanner = {};
   users.groups.step = {};
 
   # Define a user account. Don't forget to set a password with ‘passwd’.
@@ -70,6 +71,12 @@
   #     tree
   #   ];
    };
+  users.users.scanner = {
+    group = "scanner";
+    isNormalUser = false;
+    isSystemUser = true;
+    description = "User for the scanner to log in to samba";
+  };
   users.users.step = {
     group = "step";
     isNormalUser = false;
@@ -173,6 +180,45 @@
   # Enable the OpenSSH daemon.
   services.openssh.enable = true;
 
+  # Set up a samba share for the scanner
+  services.samba = {
+    enable = true;
+    openFirewall = true;
+    extraConfig = ''
+      workgroup = WORKGROUP
+      server string smbnix
+      netbios name = smbnix
+      security = user
+      guest account = nobody
+      map to guest = bad user
+    '';
+    shares = {
+      public = {
+        path = "/mnt/shares/public";
+	browseable = "yes";
+	"read only" = "no";
+	"guest ok" = "yes";
+	"create mask" = "0644";
+	"directory mask" = "0755";
+	"force user" = "username";
+	"force group" = "groupname";
+      };
+      private = {
+        path = "/mnt/shares/private";
+        browseable = "yes";
+        "read only" = "no";
+        "guest ok" = "no";
+        "create mask" = "0644";
+        "directory mask" = "0755";
+        "force user" = "username";
+        "force group" = "groupname";
+      };
+    };
+  };
+  services.samba-wsdd = {
+    enable = true;
+    openFirewall = true;
+  };
   # Enable Tailscale
   services.tailscale.enable = true;