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1 { 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 {
8 url = "https://calyx.net/ca.crt";
9 hash = "sha256-zLs7TRXrHlPjqdaBN1cmbB062XhKs4cv5ajmrkg4O8s=";
10 curlOptsList = [ "-k" ];
11 } + "";
12 key-cert = "/run/openvpn-${netns}/key+cert.pem";
13 in
14 {
15 services.openvpn.servers.${netns} = {
16 inherit netns;
17 settings = {
18 remote =
19 # new-york (vpn2.calyx.net)
20 [ "162.247.72.193" ] ++
21 [ ];
22 remote-random = true;
23 port = "443";
24 proto = "tcp";
25 inherit ca;
26 key = key-cert;
27 cert = key-cert;
28
29 auth = "SHA1";
30 client = true;
31 dev = "ov-${netns}";
32 dev-type = "tun";
33 keepalive = "10 30";
34 nobind = true;
35 persist-key = true;
36 persist-tun = true;
37 remote-cert-tls = "server";
38 reneg-sec = 0;
39 script-security = 2;
40 tls-cipher = "TLS-DHE-RSA-WITH-AES-128-CBC-SHA";
41 tls-client = true;
42 up-restart = true;
43 verb = 3;
44 };
45 };
46 systemd.services."openvpn-${netns}" = {
47 after = [ "network-online.target" ];
48 preStart = ''
49 (
50 set -ex
51 ${pkgs.curl}/bin/curl -X POST --cacert ${ca} -o ${key-cert} -vLs ${apiUrl}
52 chmod 700 ${key-cert}
53 )
54 '';
55 serviceConfig = {
56 RuntimeDirectory = [ "openvpn-${netns}" ];
57 RuntimeDirectoryMode = "0700";
58 };
59 };
60 networking.nftables.ruleset = ''
61 table inet filter {
62 chain output-net {
63 skuid root tcp dport https counter accept comment "OpenVPN Calyx"
64 skuid root tcp dport 4430 counter accept comment "OpenVPN Calyx (API)"
65 }
66 }
67 '';
68 services.netns.namespaces.${netns} = {
69 nftables = lib.mkBefore ''
70 include "${../networking/nftables.txt}"
71 table inet filter {
72 chain output-lan {
73 meta l4proto { udp, tcp } th dport domain counter accept comment "DNS"
74 log prefix "calyx: output-lan: " counter drop
75 }
76 chain output-net {
77 tcp dport { http, https } counter accept comment "HTTP"
78 log prefix "calyx: output-net: " counter drop
79 }
80 chain output {
81 ip daddr 10.0.0.0/8 counter goto output-lan
82 ip daddr 172.16.0.0/12 counter goto output-lan
83 ip daddr 192.168.0.0/16 counter goto output-lan
84 ip daddr 224.0.0.0/3 counter goto output-lan
85 jump output-net
86 log prefix "calyx: output: " counter drop
87 }
88 }
89 '';
90 };
91 }