added proxy, use mkHost function

acme.nix

@@ -0,0 +1,5 @@
+{ ... }:
+{
+  security.acme.acceptTerms = true;
+  security.acme.email = "sysadmin@giugl.io";
+}

common.nix

@@ -1,4 +1,4 @@
-{ pkgs, variables, ... }:
+{ config, pkgs, variables, lib, ... }:
 
 { 
   console = {
@@ -48,11 +48,5 @@
     unzip
     tree
     smartmontools
-  ];
+  ];  
-  
-  fileSystems."/var/cache" = {
-    device = "tmpfs";
-    fsType = "tmpfs";
-    options = ["size=3G"];
-  };
 }

flake.nix

@@ -7,58 +7,14 @@
       inputs.nixpkgs.follows = "nixpkgs";
     }; 
   };
-
+  
-  outputs = { self, nixpkgs, nixos-unstable, home-manager }:   
+  outputs = { self, nixpkgs, nixos-unstable, home-manager }: let
-  let
+    util = import ./utils.nix { inherit nixpkgs nixos-unstable home-manager; };
-    system = "x86_64-linux";
+  in  {
-
+    nixosConfigurations = {
-    unstable = import nixos-unstable { 
+      architect = util.mkHost { name = "architect"; };
-      inherit system; 
+      gAluminum = util.mkHost { name = "gAluminum"; };
-      config.allowUnfree = true; 
+      proxy = util.mkHost { name = "proxy"; };
-    };
-
-    pkgs = import nixpkgs { 
-      inherit system; 
-      config.allowUnfree = true; 
-      overlays = [ (final: prev: { inherit unstable; }) ];
-    };
-  in {
-    nixosConfigurations.architect = nixpkgs.lib.nixosSystem {
-      inherit system;
-
-      modules = [ 
-        {
-          nixpkgs.pkgs = pkgs;
-          nix.nixPath = [ 
-            "nixpkgs=${nixpkgs}" 
-            "unstable=${nixos-unstable}"
-          ];
-          nix.registry.nixpkgs.flake = nixpkgs;
-          nix.registry.unstable.flake = nixos-unstable;
-        }
-
-        home-manager.nixosModules.home-manager
-        ./hosts/architect/default.nix
-      ];
-    };
-
-    nixosConfigurations.gAluminum = nixpkgs.lib.nixosSystem {
-      inherit system;
-
-      modules = [ 
-        {
-          nixpkgs.pkgs = pkgs;
-          nix.nixPath = [ 
-            "nixpkgs=${nixpkgs}" 
-            "unstable=${nixos-unstable}"
-          ];
-          nix.registry.nixpkgs.flake = nixpkgs;
-          nix.registry.unstable.flake = nixos-unstable;
-        }
-
-        home-manager.nixosModules.home-manager
-        ./hosts/gAluminum/default.nix
-      ];
     };
   };
 }

hosts/proxy/coturn.nix

@@ -0,0 +1,66 @@
+{pkgs, config, ...}:
+
+let
+   realm = "turn.giugl.io";
+   static-auth-secret = "69duck duck fuck420";
+in {
+  services.coturn = rec {
+    enable = true;
+    no-cli = true;
+    no-tcp-relay = true;
+    min-port = 49000;
+    max-port = 50000;
+    use-auth-secret = true;
+#    cert = "${config.security.acme.certs.${realm}.directory}/full.pem";
+#    pkey = "${config.security.acme.certs.${realm}.directory}/key.pem";
+    extraConfig = ''
+      # for debugging
+      verbose
+      # ban private IP ranges
+      no-multicast-peers
+      denied-peer-ip=0.0.0.0-0.255.255.255
+      denied-peer-ip=10.0.0.0-10.255.255.255
+      denied-peer-ip=100.64.0.0-100.127.255.255
+      denied-peer-ip=127.0.0.0-127.255.255.255
+      denied-peer-ip=169.254.0.0-169.254.255.255
+      denied-peer-ip=172.16.0.0-172.31.255.255
+      denied-peer-ip=192.0.0.0-192.0.0.255
+      denied-peer-ip=192.0.2.0-192.0.2.255
+      denied-peer-ip=192.88.99.0-192.88.99.255
+      denied-peer-ip=192.168.0.0-192.168.255.255
+      denied-peer-ip=198.18.0.0-198.19.255.255
+      denied-peer-ip=198.51.100.0-198.51.100.255
+      denied-peer-ip=203.0.113.0-203.0.113.255
+      denied-peer-ip=240.0.0.0-255.255.255.255
+      denied-peer-ip=::1
+      denied-peer-ip=64:ff9b::-64:ff9b::ffff:ffff
+      denied-peer-ip=::ffff:0.0.0.0-::ffff:255.255.255.255
+      denied-peer-ip=100::-100::ffff:ffff:ffff:ffff
+      denied-peer-ip=2001::-2001:1ff:ffff:ffff:ffff:ffff:ffff:ffff
+      denied-peer-ip=2002::-2002:ffff:ffff:ffff:ffff:ffff:ffff:ffff
+      denied-peer-ip=fc00::-fdff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
+      denied-peer-ip=fe80::-febf:ffff:ffff:ffff:ffff:ffff:ffff:ffff
+    '';
+  };
+  # open the firewall
+  networking.firewall = {
+    interfaces.ens3 = let
+      range = with config.services.coturn; [ {
+      from = min-port;
+      to = max-port;
+    } ];
+    in
+    {
+      allowedUDPPortRanges = range;
+      allowedUDPPorts = [ 3478 ];
+      allowedTCPPortRanges = range;
+      allowedTCPPorts = [ 3478 ];
+    };
+  };
+  # get a certificate
+#  security.acme.certs.${realm} = {
+#    webroot = "/var/lib/acme/acme-challenge";
+#    postRun = "systemctl restart coturn.service";
+#    group = "turnserver";
+#  };
+}

hosts/proxy/default.nix

@@ -0,0 +1,69 @@
+{ config, pkgs, ... }:
+
+{
+  imports =
+    [ 
+      ./hardware-configuration.nix
+      ./coturn.nix
+    ];
+
+    boot.loader.grub.enable = true;
+    boot.loader.grub.version = 2;
+    networking.useDHCP = false;
+    networking.interfaces.ens3.useDHCP = true;
+    networking.hostName = "proxy";
+
+    environment.systemPackages = with pkgs; [
+      neovim
+      git
+      tcpdump
+    ];
+
+    networking.nameservers = [ "10.4.0.2" "1.1.1.1" ];
+    networking.firewall.allowedTCPPorts = [ 22 ];
+    system.stateVersion = "21.05"; # Did you read the comment?
+    boot.loader.grub.devices = [ "/dev/sda" ];
+    services.openssh.permitRootLogin = "prohibit-password";
+    services.openssh.passwordAuthentication = false;
+    services.openssh.enable = true;
+
+    networking.nat = {
+      enable = true;
+      externalInterface = "ens3";
+      internalInterfaces = ["wg0"];
+      forwardPorts = [
+        {
+          destination =  "10.4.0.2:1194";
+          proto = "udp";
+          sourcePort = 1194;
+        }
+      ];
+    };
+
+    networking.wireguard = {
+      interfaces."wg0" = {
+        listenPort = 1195;
+        ips = [ "10.4.0.1/24" ];
+        privateKeyFile = "/secrets/wireguard/server.key";
+
+        postSetup = ''
+          /run/current-system/sw/bin/iptables -t nat -A POSTROUTING -o wg0 -j MASQUERADE
+        '';
+
+        postShutdown = ''
+          /run/current-system/sw/bin/iptables -t nat -D POSTROUTING -o wg0 -j MASQUERADE
+        '';
+        peers = [
+          {
+    # architect
+    allowedIPs = [ "10.4.0.2" "10.3.0.0/24" ];
+    publicKey = "73oFhyQA3mgX4GmN6ul5HuOsgxa4INlzCPsyuXna0AA=";
+  }
+];
+    };
+  };
+  users.users.root.openssh.authorizedKeys.keys = [
+    "ssh-rsa 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 giulio@gAluminum"
+  ];
+}
+

hosts/proxy/hardware-configuration.nix

@@ -0,0 +1,23 @@
+# Do not modify this file!  It was generated by ‘nixos-generate-config’
+# and may be overwritten by future invocations.  Please make changes
+# to /etc/nixos/configuration.nix instead.
+{ config, lib, pkgs, modulesPath, ... }:
+
+{
+  imports =
+    [ (modulesPath + "/profiles/qemu-guest.nix")
+    ];
+
+  boot.initrd.availableKernelModules = [ "ata_piix" "virtio_pci" "virtio_scsi" "xhci_pci" "sd_mod" "sr_mod" ];
+  boot.initrd.kernelModules = [ ];
+  boot.kernelModules = [ ];
+  boot.extraModulePackages = [ ];
+
+  fileSystems."/" =
+    { device = "/dev/disk/by-uuid/8b5bcd4a-02b8-4e11-b856-eda792b8b7b8";
+      fsType = "ext4";
+    };
+
+  swapDevices = [ ];
+
+}

utils.nix

@@ -0,0 +1,38 @@
+{ nixos-unstable, nixpkgs, home-manager, ... }:
+
+{
+  mkHost = {name}: 
+  let
+    system = "x86_64-linux";
+
+    unstable = import nixos-unstable { 
+      inherit system; 
+      config.allowUnfree = true; 
+    };
+
+    pkgs = import nixpkgs { 
+      inherit system; 
+      config.allowUnfree = true; 
+      overlays = [ (final: prev: { inherit unstable; }) ];
+    };
+  in nixpkgs.lib.nixosSystem {
+    inherit system;
+    modules = [ 
+      {
+        nixpkgs.pkgs = pkgs;
+        nix.nixPath = [ 
+          "nixpkgs=${nixpkgs}" 
+          "unstable=${nixos-unstable}"
+        ];
+        nix.registry.nixpkgs.flake = nixpkgs;
+        nix.registry.unstable.flake = nixos-unstable;
+      }
+
+      ./common.nix
+      ./users.nix
+      home-manager.nixosModules.home-manager
+      ./hosts/${name}/default.nix
+      ./acme.nix
+    ];
+  };
+}