WIP: router: wireguard: change wg0 subnets to not conflict with opnsense

.gitignore

@@ -0,0 +1,5 @@
+### Nix template
+# Ignore build outputs from performing a nix-build or `nix build` command
+result
+result-*
+

hosts/router/default.nix

@@ -8,6 +8,7 @@ in
     [ # Include the results of the hardware scan.
       ./hardware-configuration.nix
       ./ifconfig.nix
+      ./wireguard.nix
       ./firewall.nix
       ./dns.nix
       ./kea.nix

hosts/router/firewall.nix

@@ -13,6 +13,7 @@ let
         ${ifs.lan30.name},
         ${ifs.lan40.name},
         ${ifs.lan50.name},
+        wg0,
     }
     define OPNSENSE_NET6 = ${vars.extra.opnsense.net6}
     define ZONE_LAN_EXTRA_NET6 = {
@@ -85,8 +86,10 @@ in
     family = "inet";
     content = ''
       ${nftIdentifiers}
-      define ALLOWED_TCP_PORTS = { ssh, https }
+      define ALLOWED_TCP_PORTS = { ssh }
-      define ALLOWED_UDP_PORTS = { bootps, dhcpv6-server, domain, https }
+      define ALLOWED_UDP_PORTS = { 18596 }
+      define ALLOWED_TCP_LAN_PORTS = { ssh, https }
+      define ALLOWED_UDP_LAN_PORTS = { bootps, dhcpv6-server, domain, https }
       set port_forward_v6 {
           type inet_proto . ipv6_addr . inet_service
           elements = {
@@ -133,6 +136,10 @@ in
           # but apparently not.
           ip6 daddr { fe80::/10, ff02::/16 } th dport { dhcpv6-client, dhcpv6-server } accept
 
+          # Global input rules
+          tcp dport $ALLOWED_TCP_PORTS accept
+          udp dport $ALLOWED_UDP_PORTS accept
+
           # WAN zone input rules
           iifname $ZONE_WAN_IFS jump zone_wan_input
           # LAN zone input rules
@@ -157,8 +164,7 @@ in
       }
 
       chain zone_wan_input {
-          # Allow SSH from WAN (if needed)
+          # Allow specific stuff from WAN
-          tcp dport ssh accept
       }
 
       chain zone_wan_forward {
@@ -180,8 +186,8 @@ in
           ip protocol icmp accept
 
           # Allow specific services from LAN
-          tcp dport $ALLOWED_TCP_PORTS accept
+          tcp dport $ALLOWED_TCP_LAN_PORTS accept
-          udp dport $ALLOWED_UDP_PORTS accept
+          udp dport $ALLOWED_UDP_LAN_PORTS accept
       }
 
       chain zone_lan_forward {

hosts/router/secrets/wireguard/wg0-peer-AsusS513-psk.age

@@ -0,0 +1,5 @@
+age-encryption.org/v1
+-> ssh-ed25519 D2MY/A YAk0egMScFdPo0uAZzITtgQyPAifDcVUfb957Zhz9Ec
+pAEM+7sbPE8rHBhRV7mTmH1w4mbfKFopMWbwu/3KHCw
+--- ykshsqEqKvCCE2kWIPAJPA/DFW7mu6+0x4MQhHgi1yU
+'<27>zƀ{g<>id\{<7B>E<EFBFBD><45><EFBFBD>tp<74>U<>g2QC3g<33><08>JG<4A>V1<56>6<>WG_E&<26>v<EFBFBD><76>)<29>&<26><><EFBFBD>ޑN"<22><><EFBFBD>n<EFBFBD>_T͒<54>

hosts/router/secrets/wireguard/wg0-peer-Yura-TPX13-psk.age

@@ -0,0 +1,6 @@
+age-encryption.org/v1
+-> ssh-ed25519 D2MY/A P88M0uj4ZphVo3WrRYDu+c7B0Dl7ncctbYkByYmU2wg
+DV3Gn6TQ6iByAlNt0gg8kSZ2r0Gie/wcznZx9M+CC2g
+--- KhwGM50BVql02Jq0do2uhXMfgWPPDfbodzDRmZ9n0O4
+r<EFBFBD><EFBFBD><EFBFBD>Զa<EFBFBD>yY/C<><43>J<EFBFBD>B<EFBFBD>X<EFBFBD>!<21>"F
+<EFBFBD>h<EFBFBD><EFBFBD><EFBFBD>(<28>L><3E>()<29><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>S;<3B>}}2ОO.<2E><13>hoqY<19>K"c<>E<EFBFBD><45>JM?-<2D>O

hosts/router/secrets/wireguard/wg0-private-key.age

@@ -0,0 +1,5 @@
+age-encryption.org/v1
+-> ssh-ed25519 D2MY/A tvRtTGWnaB0zxqZRba4/XpzwPa61RrnHCk4tT8OfnGQ
+IX85Q5VKxQTl+MnhzwiuTnNMVkR9QrYo/1njrbZeBnQ
+--- dmlPIL2T+RFhbO2iLDRa4BxxYSSUQdedV3TK83ooFdA
+<18>gE	7<><37>0`d<>V(o<>W<EFBFBD><57><EFBFBD>S@
<01>ۭ<EFBFBD><DBAD><EFBFBD>p<EFBFBD><70><EFBFBD><EFBFBD><EFBFBD>Z<EFBFBD><5A>ЃT<D083><54><EFBFBD><EFBFBD><14>U<EFBFBD><55>+*<2A>\Q<><51>[<5B><><EFBFBD><EFBFBD>x<><78>29<32>i5<69>k

hosts/router/services.nix

@@ -52,7 +52,7 @@ in
     };
   };
 
-  secrix.system.secrets.cf-api-key.encrypted.file = ../../secrets/cf_api_key.age;
+  secrix.system.secrets.cf-api-key.encrypted.file = ./secrets/cf-api-key.age;
   systemd.services.caddy.serviceConfig.EnvironmentFile = config.secrix.system.secrets.cf-api-key.decrypted.path;
   services.caddy = {
     enable = true;

hosts/router/vars.nix

@@ -99,6 +99,17 @@ rec {
     };
   };
 
+  wg = {
+    wg0 = rec {
+      name = "wg0";
+      p4 = "10.18.16";  # .0/24
+      addr4 = "${p4}.1";
+      addr4Sized = "${addr4}/24";
+      p6 = "${pdFromWan}f::6";  # :0:0/96
+      addr6 = "${p6}:0:1";
+      addr6Sized = "${addr6}/96";
+  };
+
   extra = {
     opnsense = rec {
       addr4 = "${ifs.lan.p4}.250";

hosts/router/wireguard.nix

@@ -0,0 +1,67 @@
+{ config, lib, pkgs, ... }:
+let
+  vars = import ./vars.nix;
+  wg0 = vars.wg.wg0;
+
+  wg0Peers = {
+    "Yura-TPX13" = {
+      allowedIPs = [ "${wg0.p4}.3/32" "${wg0.p6}:3:0/112" ];
+      publicKey = "iJa5JmJbMHNlbEluNwoB2Q8LyrPAfb7S/mluanMcI08=";
+      pskEnabled = true;
+    };
+    "Yura-Pixel7Pro" = {
+      allowedIPs = [ "${wg0.p4}.4/32" "${wg0.p6}:4:0/112" ];
+      publicKey = "UjZlsukmAsX60Z5FnZwKCSu141Gjj74+hBVT3TRhwT4=";
+      pskEnabled = true;
+    };
+    "AsusS513" = {
+      allowedIPs = [ "${wg0.p4}.100/32" ];
+      publicKey = "XozJ7dHdJfkLORkCVxaB1VmvHEOAA285kRZcmzfPl38=";
+      pskEnabled = false;
+    };
+  };
+  peerSecretName = name: "wg0-peer-${name}-psk";
+  secrets = config.secrix.services.systemd-networkd.secrets;
+in
+{
+  secrix.services.systemd-networkd.secrets = let
+    pskPeers = lib.attrsets.filterAttrs (name: peer: peer.pskEnabled) wg0Peers;
+    mapPeer = name: peer: {
+      name = peerSecretName name;
+      value.encrypted.file = ./secrets/wireguard/${peerSecretName name}.age;
+    };
+    peerSecrets = lib.attrsets.mapAttrs' mapPeer pskPeers;
+  in
+  {
+    wg0-private-key.encrypted.file = ./secrets/wireguard/wg0-private-key.age;
+  } // peerSecrets;
+
+  systemd.network.netdevs = {
+    "10-wg0" = {
+      netdevConfig = {
+        Kind = "wireguard";
+        Name = "wg0";
+      };
+      wireguardConfig = {
+        PrivateKeyFile = secrets.wg0-private-key.decrypted.path;
+        ListenPort = 18596;
+      };
+      wireguardPeers = map (peer: {
+        AllowedIPs = lib.strings.concatStringsSep "," peer.value.allowedIPs;
+        PublicKey = peer.value.publicKey;
+        PresharedKeyFile = if peer.value.pskEnabled then secrets."${peerSecretName peer.name}".decrypted.path else null;
+      }) (lib.attrsToList wg0Peers);
+    };
+  };
+
+  systemd.network.networks = {
+    "10-wg0" = {
+      matchConfig.Name = "wg0";
+      networkConfig = {
+        IPv4Forwarding = true;
+        IPv6SendRA = false;
+        Address = [ wg0.addr4Sized wg0.addr6Sized ];
+      };
+    };
+  };
+}