129 lines
3.7 KiB
Nix
129 lines
3.7 KiB
Nix
# It's a pain setting up Certificate Authority, Public Key Infrastructure, etc. for OpenVPN.
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# Instead setup multiple openvpn servers with multiple ports, with each server having one client.
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#
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# Does not scale well, but it's good enough for personal use.
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#
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# TODO: Create CA, and ROOTCA, and use them to sign the keys, then store in sops-nix secrets.
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{ config, lib, pkgs, ... }:
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let
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cfg = config.profile.services.openvpn;
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domain = "vpn.tigor.web.id";
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portLaptop = 1194;
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portPhone = 1195;
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vpn-dev-laptop = "tun0";
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vpn-dev-phone = "tun1";
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externalInterface = config.profile.networking.externalInterface;
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inherit (lib) mkIf;
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in
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{
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config = mkIf cfg.enable {
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environment.systemPackages = [ pkgs.openvpn ]; # To generate keys with openvpn --genkey --secret <name>.key
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# Enable IP forwarding to allow the VPN to act as a gateway.
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boot.kernel.sysctl."net.ipv4.ip_forward" = 1;
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networking.nat = {
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enable = true;
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inherit externalInterface;
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internalInterfaces = [ vpn-dev-laptop vpn-dev-phone ];
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};
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networking.firewall.trustedInterfaces = [ vpn-dev-laptop vpn-dev-phone ];
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networking.firewall.allowedUDPPorts = [ portLaptop portPhone ];
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sops = {
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# Activate the secrets.
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secrets =
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let
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opts = {
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sopsFile = ../../secrets/openvpn.yaml;
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};
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in
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{
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"openvpn/server/ip" = opts;
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"openvpn/key/phone" = opts;
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"openvpn/key/laptop" = opts;
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};
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# This section creates .ovpn files for the clients in /etc/openvpn folder. These should be shared with the clients.
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templates =
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let
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template = { secretPlaceholder, port, ifConfig }: ''
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dev tun
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remote "${config.sops.placeholder."openvpn/server/ip"}"
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port ${toString port}
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ifconfig ${ifConfig}
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redirect-gateway def1
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cipher AES-256-CBC
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auth-nocache
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comp-lzo
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keepalive 10 60
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resolv-retry infinite
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nobind
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persist-key
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persist-tun
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secret [inline]
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<secret>
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${secretPlaceholder}
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</secret>
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'';
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in
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{
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"openvpn/key/phone" = {
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content = template {
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secretPlaceholder = config.sops.placeholder."openvpn/key/phone";
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port = portPhone;
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ifConfig = "10.8.1.1 10.8.1.2";
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};
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path = "/etc/openvpn/phone.ovpn";
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owner = config.profile.user.name;
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};
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"openvpn/key/laptop" = {
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content = template {
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secretPlaceholder = config.sops.placeholder."openvpn/key/laptop";
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port = portLaptop;
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ifConfig = "10.8.2.1 10.8.2.2";
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};
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path = "/etc/openvpn/laptop.ovpn";
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owner = config.profile.user.name;
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};
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};
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};
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services.openvpn.servers =
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let
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configTemplate = { secretFile, port, dev }: ''
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dev ${dev}
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proto udp
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secret ${secretFile}
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port ${toString port}
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cipher AES-256-CBC
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auth-nocache
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comp-lzo
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keepalive 10 60
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ping-timer-rem
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persist-tun
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persist-key
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'';
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in
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{
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phone = {
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config = configTemplate { secretFile = config.sops.secrets."openvpn/key/phone".path; port = portPhone; dev = vpn-dev-phone; };
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autoStart = true;
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};
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laptop = {
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config = configTemplate { secretFile = config.sops.secrets."openvpn/key/laptop".path; port = portLaptop; dev = vpn-dev-laptop; };
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autoStart = true;
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};
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};
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};
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}
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