VEGAS: add OpenVPN

data/vpn-ca-bundle.crt

@@ -0,0 +1,54 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

data/vpn-host-VEGAS.crt

@@ -0,0 +1,31 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----

hosts/VEGAS/services/openvpn/default.nix

@@ -0,0 +1,73 @@
+{ config, hosts, lib, pkgs, tools, ... }:
+let
+  inherit (hosts.${config.networking.hostName}) interfaces;
+  inherit (interfaces) vstub;
+  inherit (config.networking) hostName;
+
+  sharedConfig = pkgs.writeText "openvpn-shared.conf" ''
+    port 51194
+    float
+    mssfix 1340
+
+    topology subnet
+    client-to-client
+    persist-key
+    persist-tun
+
+    # vpn supernet
+    push "route 10.100.0.0 255.255.0.0"
+    # internal services supernet
+    push "route 10.10.0.0 255.255.0.0"
+    # host machine virtual stub
+    push "route ${vstub.addr} 255.255.255.255"
+
+    # dns config
+    push "dhcp-option DOMAIN vpn.${tools.meta.domain}"
+    push "dhcp-option DNS ${vstub.addr}"
+
+    ca ${../../../../data/vpn-ca-bundle.crt}
+    cert ${../../../../data + "/vpn-host-${hostName}.crt"}
+    key ${config.age.secrets.vpn-host-key.path}
+    dh ${config.security.dhparams.params.vpn.path}
+  '';
+in
+{
+  age.secrets.vpn-host-key = {
+    file = ../../../../secrets + "/vpn-host-key-${hostName}.age";
+    mode = "0400";
+  };
+  security.dhparams.params.vpn.bits = 4096;
+  networking.firewall = {
+    allowedTCPPorts = [ 51194 ];
+    allowedUDPPorts = [ 51194 ];
+  };
+  networking.nat.internalInterfaces = [
+    "tun-storm"
+    "tun-cyclone"
+  ];
+
+  services.openvpn.servers = {
+    storm = {
+      autoStart = true;
+      config = ''
+        proto udp4
+        dev tun-storm
+        server 10.100.0.0 255.255.255.0
+        config ${sharedConfig}
+      '';
+    };
+    cyclone = {
+      autoStart = true;
+      config = ''
+        proto tcp4
+        dev tun-cyclone
+        server 10.100.1.0 255.255.255.0
+        config ${sharedConfig}
+      '';
+    };
+  };
+  systemd.services = lib.genAttrs (map (x: "openvpn-${x}") (builtins.attrNames config.services.openvpn.servers)) (_: {
+    wants = [ "dhparams-gen-vpn.service" ];
+    after = [ "dhparams-gen-vpn.service" ];
+  });
+}

hosts/VEGAS/system.nix

@@ -32,6 +32,7 @@
       ./services/nix/binary-cache.nix
       ./services/nix/nar-serve.nix
       ./services/object-storage
+      ./services/openvpn
       ./services/warehouse
       ./services/websites
     ]

secrets/secrets.nix

@@ -22,4 +22,5 @@ in with hosts;
   "synapse-ldap.age".publicKeys = max ++ map systemKeys [ VEGAS ];
   "synapse-turn.age".publicKeys = max ++ map systemKeys [ VEGAS ];
   "wireguard-key-wgautobahn.age".publicKeys = max ++ map systemKeys [ VEGAS ];
+  "vpn-host-key-VEGAS.age".publicKeys = max ++ map systemKeys [ VEGAS ];
 }