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openvpn: update configurations

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Tigor Hutasuhut 2024-06-14 19:30:17 +07:00
parent 4b3c971a12
commit 381a2d92e9
2 changed files with 68 additions and 58 deletions
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23
secrets/openvpn.yaml
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File diff suppressed because one or more lines are too long

85
system/services/openvpn.nix
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@ -1,19 +1,11 @@
# It's a pain setting up Certificate Authority, Public Key Infrastructure, etc. for OpenVPN.
# Instead setup multiple openvpn servers with multiple ports, with each server having one client.
#
# Does not scale well, but it's good enough for personal use.
#
# TODO: Create CA, and ROOTCA, and use them to sign the keys, then store in sops-nix secrets.
# Guide on how to create client ovpn files, and server config: https://wiki.archlinux.org/title/OpenVPN/Checklist_guide
{ config, lib, pkgs, ... }:
let
cfg = config.profile.services.openvpn;
domain = "vpn.tigor.web.id";
portLaptop = 1194;
portPhone = 1195;
vpn-dev-laptop = "tun0";
vpn-dev-phone = "tun1";
port = 1194;
vpn-dev = "tun0";
externalInterface = config.profile.networking.externalInterface;
inherit (lib) mkIf;
in
@ -27,11 +19,11 @@ in
networking.nat = {
enable = true;
inherit externalInterface;
internalInterfaces = [ vpn-dev-laptop vpn-dev-phone ];
internalInterfaces = [ vpn-dev ];
};
networking.firewall.trustedInterfaces = [ vpn-dev-laptop vpn-dev-phone ];
networking.firewall.allowedUDPPorts = [ portLaptop portPhone ];
networking.firewall.trustedInterfaces = [ vpn-dev ];
networking.firewall.allowedUDPPorts = [ port ];
sops = {
# Activate the secrets.
@ -43,41 +35,50 @@ in
in
{
"openvpn/server/ip" = opts;
"openvpn/key/phone" = opts;
"openvpn/key/laptop" = opts;
"openvpn/server/ca" = opts;
"openvpn/server/cert" = opts;
"openvpn/server/key" = opts;
"openvpn/server/tls-auth" = opts;
"openvpn/server/dh" = opts;
"openvpn/clients/phone" = opts;
"openvpn/clients/laptop" = opts;
};
# This section creates .ovpn files for the clients in /etc/openvpn folder. These should be shared with the clients.
templates =
let
template = { secretPlaceholder, port, ifConfig }: ''
# secretPlaceholder is a generated inline file from easyrsa build-client-full.
# it contains <cert>, <key>, <ca> sections.
template = { secretPlaceholder, ifConfig }: ''
client
dev tun
remote "${config.sops.placeholder."openvpn/server/ip"}"
remote "${domain}"
port ${toString port}
ifconfig ${ifConfig}
redirect-gateway def1
cipher AES-256-CBC
auth-nocache
comp-lzo
keepalive 10 60
resolv-retry infinite
nobind
persist-key
persist-tun
secret [inline]
key-direction 1
tls-client
<tls-auth>
${config.sops.placeholder."openvpn/server/tls-auth"}
</tls-auth>
<secret>
${secretPlaceholder}
</secret>
'';
in
{
"openvpn/key/phone" = {
content = template {
secretPlaceholder = config.sops.placeholder."openvpn/key/phone";
port = portPhone;
secretPlaceholder = config.sops.placeholder."openvpn/clients/phone";
ifConfig = "10.8.1.1 10.8.1.2";
};
path = "/etc/openvpn/phone.ovpn";
@ -85,8 +86,7 @@ in
};
"openvpn/key/laptop" = {
content = template {
secretPlaceholder = config.sops.placeholder."openvpn/key/laptop";
port = portLaptop;
secretPlaceholder = config.sops.placeholder."openvpn/clients/laptop";
ifConfig = "10.8.2.1 10.8.2.2";
};
path = "/etc/openvpn/laptop.ovpn";
@ -94,34 +94,31 @@ in
};
};
};
services.openvpn.servers =
let
configTemplate = { secretFile, port, dev }: ''
dev ${dev}
services.openvpn.servers.homeserver = {
config = ''
dev ${vpn-dev}
proto udp
secret ${secretFile}
port ${toString port}
tls-server
cipher AES-256-CBC
auth-nocache
tls-cipher TLS-DHE-RSA-WITH-AES-256-CBC-SHA
server 10.10.10.0 255.255.255.0
allow-compression no
ca ${config.sops.secrets."openvpn/server/ca".path}
cert ${config.sops.secrets."openvpn/server/cert".path}
key ${config.sops.secrets."openvpn/server/key".path}
dh ${config.sops.secrets."openvpn/server/dh".path}
tls-auth ${config.sops.secrets."openvpn/server/tls-auth".path} 0
comp-lzo
keepalive 10 60
ping-timer-rem
persist-tun
persist-key
'';
in
{
phone = {
config = configTemplate { secretFile = config.sops.secrets."openvpn/key/phone".path; port = portPhone; dev = vpn-dev-phone; };
autoStart = true;
};
laptop = {
config = configTemplate { secretFile = config.sops.secrets."openvpn/key/laptop".path; port = portLaptop; dev = vpn-dev-laptop; };
autoStart = true;
};
};
};
}