From bf8a48eae55bec89f06508136d65ee98ceace558 Mon Sep 17 00:00:00 2001
From: sinanmohd <sinan@sinanmohd.com>
Date: Sun, 17 Sep 2023 13:59:03 +0530
Subject: networking/wireguard: init

---
 hosts/kay/modules/wireguard.nix | 54 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 hosts/kay/modules/wireguard.nix

(limited to 'hosts/kay/modules/wireguard.nix')

diff --git a/hosts/kay/modules/wireguard.nix b/hosts/kay/modules/wireguard.nix
new file mode 100644
index 0000000..4839280
--- /dev/null
+++ b/hosts/kay/modules/wireguard.nix
@@ -0,0 +1,54 @@
+{ config, ... }:
+
+let
+  wgInterface = "wg";
+  wanInterface = "ppp0";
+  subnet = "10.0.1.0";
+  prefix = 24;
+  port = 51820;
+in
+{
+  sops.secrets."misc/wireguard" = {};
+
+  networking = {
+    nat.enable = true;
+    firewall = {
+      allowedUDPPorts = [ port ];
+      extraCommands = ''
+        # nat datagrams comming through lanInterface to wanInterface
+        iptables -t nat -I POSTROUTING 1 -s ${subnet}/${toString prefix} -o ${wanInterface} -j MASQUERADE
+
+        # allow all traffic on lanInterface interface
+        iptables -I INPUT 1 -i ${wgInterface} -j ACCEPT
+
+        # forward rules
+        iptables -I FORWARD 1 -i ${wgInterface} -o ${wgInterface} -j ACCEPT
+        iptables -I FORWARD 1 -i ${wanInterface} -o ${wgInterface} -j ACCEPT
+        iptables -I FORWARD 1 -i ${wgInterface} -o ${wanInterface} -j ACCEPT
+      '';
+    };
+
+    wireguard.interfaces.${wgInterface} = {
+      ips = [ "10.0.1.1/${toString prefix}" ];
+      listenPort = port;
+      mtu = 1380; # 1460 (ppp0) - 80
+      privateKeyFile = config.sops.secrets."misc/wireguard".path;
+
+      peers = [
+        { # cez
+          publicKey = "IcMpAs/D0u8O/AcDBPC7pFUYSeFQXQpTqHpGOeVpjS8=";
+          allowedIPs = [ "10.0.1.2/32" ];
+        }
+        { # veu
+          publicKey = "bJ9aqGYD2Jh4MtWIL7q3XxVHFuUdwGJwO8p7H3nNPj8=";
+          allowedIPs = [ "10.0.1.3/32" ];
+        }
+      ];
+    };
+  };
+
+  services.dnsmasq.settings = {
+    no-dhcp-interface = wgInterface;
+    interface = [ wgInterface  ];
+  };
+}
-- 
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