nixos/hosts/Legion/configuration.nix

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# Edit this configuration file to define what should be installed on
# your system. Help is available in the configuration.nix(5) man page
# and in the NixOS manual (accessible by running `nixos-help`).
{ ... }:
let
# generate via openvpn --genkey --secret openvpn-laptop.key
client-key = "/root/openvpn.key";
domain = "vpn.xenia.me.uk";
vpn-dev = "tun0";
port = 1194;
in {
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# Use the systemd-boot EFI boot loader.
boot.loader.systemd-boot.enable = true;
boot.loader.efi.canTouchEfiVariables = true;
system.autoUpgrade = {
enable = true;
dates = "02:00";
allowReboot = true;
rebootWindow = {
lower = "03:00";
upper = "05:00";
};
};
networking = {
nat = {
enable = true;
externalInterface = "enp42s0";
internalInterfaces = [ vpn-dev ];
};
firewall = {
trustedInterfaces = [ vpn-dev ];
allowedUDPPorts = [ port ];
};
};
services = {
syncthing = let dataDir = "/var/lib/syncthing";
in {
inherit dataDir;
settings.folders = {
"Archive".path = dataDir + "/Archive";
"Books".path = dataDir + "/Books";
"Comics".path = dataDir + "/Comics";
"Documents".path = dataDir + "/Documents";
"Exports".path = dataDir + "/Exports";
"Notes".path = dataDir + "/Notes";
"Pictures".path = dataDir + "/Pictures";
"Tasks".path = dataDir + "/Tasks";
"Zotero".path = dataDir + "/Zotero";
};
};
openvpn = {
restartAfterSleep = true;
servers.xenia.config = ''
dev ${vpn-dev}
proto udp
ifconfig 10.8.0.1 10.8.0.2
secret ${client-key}
port ${toString port}
cipher AES-256-CBC
auth-nocache
comp-lzo
keepalive 10 60
ping-timer-rem
persist-tun
persist-key
'';
};
};
environment.etc."openvpn/client.ovpn" = {
text = ''
dev tun
remote "${domain}"
ifconfig 10.8.0.2 10.8.0.1
port ${toString port}
redirect-gateway def1
cipher AES-256-CBC
auth-nocache
comp-lzo
keepalive 10 60
resolv-retry infinite
nobind
persist-key
persist-tun
secret [inline]
'';
mode = "600";
};
system.activationScripts.openvpn-addkey = ''
f="/etc/openvpn/client.ovpn"
if ! grep -q '<secret>' $f; then
echo "appending secret key"
echo "<secret>" >> $f
cat ${client-key} >> $f
echo "</secret>" >> $f
fi
'';
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}