1 files changed, 103 insertions, 0 deletions
diff --git a/modules/xnet/net/vpn-gateway.nix b/modules/xnet/net/vpn-gateway.nix
new file mode 100644
index 0000000..d26ced1
--- /dev/null
+++ b/modules/xnet/net/vpn-gateway.nix
@@ -0,0 +1,103 @@
+{ config, lib, pkgs, ... }:
+let
+  cfg = config.xnet.net.vpnGateway;
+  inherit (lib) mkOption mkIf types;
+
+  iface = "enp2s0";
+  fwmark = "0x1";
+  ip = "192.168.2.113";
+  vpn = {
+    iface = "wg0";
+    endpoint = "149.88.22.129:51820";
+    addr = "10.69.70.71/32";
+    peers = [
+
+    ];
+  };
+in
+
+{
+  # options.xnet.net.vpnGateway = {
+  #   interface = mkOption {
+  #     type = types.str;
+  #     description = "Interface to forward VPN routed packets to internet";
+  #   };
+  #
+  #   vpn = types.subModule {
+  #     interface = mkOption {
+  #       type = types.str;
+  #       default = "wg0";
+  #       description = "Name of VPN interface.";
+  #     };
+  #
+  #     endpoint = mkOption {
+  #       type = types.str;
+  #       description = "ip:port of the VPN endpoint.";
+  #     };
+  #
+  #     addr = mkOption {
+  #       type = types.str;
+  #       description = "Address of the VPN interface.";
+  #     };
+  #
+  #     privateKeyFile = mkOption {
+  #       type = types.str;
+  #       description = "Path to private key.";
+  #     };
+  #
+  #     peers = types.listOf types.subModule {
+  #
+  #     };
+  #   };
+
+  boot.kernel.sysctl = {
+    "net.ipv4.ip_forward" = 1;
+    "net.ipv6.conf.all.forwarding" = 1;
+  };
+
+  networking = {
+    wg-quick.interfaces."${vpn.iface}" = {
+      address = [ vpn.addr ];
+      privateKeyFile = "/certs/wg/private.key";
+
+      peers = [{
+        publicKey = "yxyntWsANEwxeR0pOPNAcfWY7zEVICZe9G+GxortzEY=";
+        allowedIPs = [ "0.0.0.0/0" ];
+        endpoint = "149.88.22.129:51820";
+        persistentKeepalive = 25;
+      }];
+    };
+
+    nat = {
+      enable = true;
+      externalInterface = "wg0";
+      internalInterfaces = [ "enp2s0" ];
+    };
+
+    firewall = {
+      extraCommands = ''
+        # Create a new routing table for forwarded traffic
+        echo "200 vpn" >> /etc/iproute2/rt_tables
+
+        # Mark packets from other hosts
+        iptables -t mangle -A PREROUTING -i enp2s0 ! -s 192.168.1.113 -j MARK --set-mark 0x1
+
+        # Route marked packets through WireGuard
+        ip rule add fwmark 0x1 table vpn
+        ip route add default dev wg0 table vpn
+
+        # Allow forwarding
+        iptables -A FORWARD -i enp2s0 -o wg0 -j ACCEPT
+        iptables -A FORWARD -i wg0 -o enp2s0 -m state --state RELATED,ESTABLISHED -j ACCEPT
+
+        # NAT only forwarded traffic
+        iptables -t nat -A POSTROUTING -o wg0 ! -s 192.168.1.113 -j MASQUERADE
+      '';
+
+      extraStopCommands = ''
+        ip rule del fwmark 0x1 table vpn 2>/dev/null || true
+        ip route flush table vpn 2>/dev/null || true
+      '';
+    };
+  };
+}