{ pkgs, lib, config, ... }: let netns = "calyx"; inherit (config.services) openvpn; apiUrl = "https://api.calyx.net:4430/3/cert"; ca = pkgs.fetchurl { url = "https://calyx.net/ca.crt"; hash = "sha256-NKLkpjjeGMN07htuWydBMQ03ytxF9CLm8SLNl3IPPGc="; curlOpts = ["-k"]; } + ""; key-cert = "/run/openvpn-${netns}/key+cert.pem"; in { services.openvpn.servers.${netns} = { inherit netns; settings = { remote = # new-york ["162.247.73.193"] ++ []; port = "443"; proto = "tcp"; inherit ca; key = key-cert; cert = key-cert; auth = "SHA1"; cipher = "AES-128-CBC"; client = true; dev = "ov-${netns}"; dev-type = "tun"; keepalive = "10 30"; nobind = true; persist-key = true; persist-tun = true; remote-cert-tls = "server"; reneg-sec = 0; script-security = 2; tls-cipher = "DHE-RSA-AES128-SHA"; tls-client = true; tun-ipv6 = true; up-restart = true; verb = 3; }; }; systemd.services."openvpn-${netns}" = { preStart = '' ( set -ex ${pkgs.curl}/bin/curl -X POST --cacert ${ca} -o ${key-cert} -Ls ${apiUrl} chmod 700 ${key-cert} ) ''; serviceConfig = { RuntimeDirectory = [ "openvpn-${netns}" ]; RuntimeDirectoryMode = "0700"; }; }; networking.nftables.ruleset = '' add rule inet filter fw2net meta skuid root tcp dport 443 counter accept comment "OpenVPN Calyx" add rule inet filter fw2net meta skuid root tcp dport 4430 counter accept comment "OpenVPN Calyx (API)" ''; services.netns.namespaces.${netns} = { nftables = lib.mkBefore '' table inet filter { include "${../../../../networking/nftables/filter.txt}" chain input { type filter hook input priority filter policy drop iifname lo accept jump check-tcp ct state { established, related } accept jump accept-connectivity-input jump check-broadcast ct state invalid drop } chain forward { type filter hook forward priority filter policy drop jump accept-connectivity-forward } chain output { type filter hook output priority filter policy drop oifname lo accept ct state { related, established } accept jump accept-connectivity-output } } ''; }; }