hosts/losurdo/networking/openvpn/calyx.nix

   1 { inputs, pkgs, lib, config, ... }:
   2 let
   3   netns = "calyx";
   4   inherit (config.services) openvpn;
   5   apiUrl = "https://api.calyx.net:4430/3/cert";
   6   ca = pkgs.fetchurl {
   7     url = "https://calyx.net/ca.crt";
   8     hash = "sha256-NKLkpjjeGMN07htuWydBMQ03ytxF9CLm8SLNl3IPPGc=";
   9     curlOpts = ["-k"];
  10   } + "";
  11   key-cert = "/run/openvpn-${netns}/key+cert.pem";
  12 in
  13 {
  14 services.openvpn.servers.${netns} = {
  15   inherit netns;
  16   settings = {
  17     remote =
  18       # new-york
  19       ["162.247.73.193"] ++
  20       [];
  21     port = "443";
  22     proto = "tcp";
  23     inherit ca;
  24     key = key-cert;
  25     cert = key-cert;
  26
  27     auth = "SHA1";
  28     cipher = "AES-128-CBC";
  29     client = true;
  30     dev = "ov-${netns}";
  31     dev-type = "tun";
  32     keepalive = "10 30";
  33     nobind = true;
  34     persist-key = true;
  35     persist-tun = true;
  36     remote-cert-tls = "server";
  37     reneg-sec = 0;
  38     script-security = 2;
  39     tls-cipher = "TLS-DHE-RSA-WITH-AES-128-CBC-SHA";
  40     tls-client = true;
  41     tun-ipv6 = true;
  42     up-restart = true;
  43     verb = 3;
  44   };
  45 };
  46 systemd.services."openvpn-${netns}" = {
  47   preStart = ''
  48     (
  49     set -ex
  50     ${pkgs.curl}/bin/curl -X POST --cacert ${ca} -o ${key-cert} -Ls ${apiUrl}
  51     chmod 700 ${key-cert}
  52     )
  53   '';
  54   serviceConfig = {
  55     RuntimeDirectory = [ "openvpn-${netns}" ];
  56     RuntimeDirectoryMode = "0700";
  57   };
  58 };
  59 networking.nftables.ruleset = ''
  60   table inet filter {
  61     chain output-net {
  62       skuid root tcp dport https counter accept comment "OpenVPN Calyx"
  63       skuid root tcp dport 4430 counter accept comment "OpenVPN Calyx (API)"
  64     }
  65   }
  66 '';
  67 services.netns.namespaces.${netns} = {
  68   nftables = lib.mkBefore ''
  69     include "${inputs.julm-nix + "/nixos/profiles/networking/nftables.txt"}"
  70   '';
  71 };
  72 }