3 files changed, 59 insertions, 2 deletions
diff --git a/hosts/kay/modules/network.nix b/hosts/kay/modules/network.nix
index 9ef8ee6..12788c6 100644
--- a/hosts/kay/modules/network.nix
+++ b/hosts/kay/modules/network.nix
@@ -7,7 +7,10 @@ let
   nameServer = "1.0.0.1";
 in
 {
-  imports = [ ./router.nix ];
+  imports = [
+    ./wireguard.nix
+    ./router.nix
+  ];
 
   sops.secrets = {
     "ppp/chap-secrets" = {};
diff --git a/hosts/kay/modules/router.nix b/hosts/kay/modules/router.nix
index c33fff2..e390ded 100644
--- a/hosts/kay/modules/router.nix
+++ b/hosts/kay/modules/router.nix
@@ -37,6 +37,6 @@ in
 
   services.dnsmasq.settings = {
     dhcp-range = [ "${leaseRangeStart},${leaseRangeEnd}" ];
-    interface = lanInterface;
+    interface = [ lanInterface ];
   };
 }
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  ];
+  };
+}