eaab02b94f
Do the right thing, and use multiple interfaces for policy routing. For example, WireGuard interfaces do not allow multiple routes for the same CIDR range.
279 lines
8.7 KiB
Nix
279 lines
8.7 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.networking.wireguard;
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kernel = config.boot.kernelPackages;
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# interface options
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interfaceOpts = { name, ... }: {
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options = {
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ips = mkOption {
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example = [ "192.168.2.1/24" ];
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default = [];
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type = with types; listOf str;
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description = "The IP addresses of the interface.";
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};
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privateKey = mkOption {
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example = "yAnz5TF+lXXJte14tji3zlMNq+hd2rYUIgJBgB3fBmk=";
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type = with types; nullOr str;
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default = null;
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description = ''
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Base64 private key generated by wg genkey.
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Warning: Consider using privateKeyFile instead if you do not
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want to store the key in the world-readable Nix store.
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'';
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};
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privateKeyFile = mkOption {
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example = "/private/wireguard_key";
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type = with types; nullOr str;
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default = null;
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description = ''
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Private key file as generated by wg genkey.
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'';
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};
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listenPort = mkOption {
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default = null;
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type = with types; nullOr int;
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example = 51820;
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description = ''
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16-bit port for listening. Optional; if not specified,
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automatically generated based on interface name.
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'';
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};
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preSetup = mkOption {
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example = literalExample [''
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${pkgs.iproute}/bin/ip netns add foo
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''];
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default = [];
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type = with types; listOf str;
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description = ''
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A list of commands called at the start of the interface setup.
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'';
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};
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postSetup = mkOption {
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example = literalExample [''
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${pkgs.bash} -c 'printf "nameserver 10.200.100.1" | ${pkgs.openresolv}/bin/resolvconf -a wg0 -m 0'
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''];
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default = [];
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type = with types; listOf str;
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description = "A list of commands called at the end of the interface setup.";
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};
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postShutdown = mkOption {
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example = literalExample ["${pkgs.openresolv}/bin/resolvconf -d wg0"];
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default = [];
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type = with types; listOf str;
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description = "A list of commands called after shutting down the interface.";
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};
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table = mkOption {
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default = "main";
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type = types.str;
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description = ''The kernel routing table to add this interface's
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associated routes to. Setting this is useful for e.g. policy routing
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("ip rule") or virtual routing and forwarding ("ip vrf"). Both numeric
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table IDs and table names (/etc/rt_tables) can be used. Defaults to
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"main".'';
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};
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peers = mkOption {
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default = [];
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description = "Peers linked to the interface.";
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type = with types; listOf (submodule peerOpts);
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};
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};
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};
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# peer options
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peerOpts = {
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options = {
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publicKey = mkOption {
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example = "xTIBA5rboUvnH4htodjb6e697QjLERt1NAB4mZqp8Dg=";
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type = types.str;
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description = "The base64 public key the peer.";
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};
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presharedKey = mkOption {
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default = null;
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example = "rVXs/Ni9tu3oDBLS4hOyAUAa1qTWVA3loR8eL20os3I=";
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type = with types; nullOr str;
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description = ''
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Base64 preshared key generated by wg genpsk. Optional,
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and may be omitted. This option adds an additional layer of
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symmetric-key cryptography to be mixed into the already existing
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public-key cryptography, for post-quantum resistance.
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Warning: Consider using presharedKeyFile instead if you do not
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want to store the key in the world-readable Nix store.
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'';
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};
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presharedKeyFile = mkOption {
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default = null;
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example = "/private/wireguard_psk";
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type = with types; nullOr str;
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description = ''
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File pointing to preshared key as generated by wg pensk. Optional,
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and may be omitted. This option adds an additional layer of
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symmetric-key cryptography to be mixed into the already existing
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public-key cryptography, for post-quantum resistance.
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'';
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};
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allowedIPs = mkOption {
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example = [ "10.192.122.3/32" "10.192.124.1/24" ];
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type = with types; listOf str;
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description = ''List of IP (v4 or v6) addresses with CIDR masks from
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which this peer is allowed to send incoming traffic and to which
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outgoing traffic for this peer is directed. The catch-all 0.0.0.0/0 may
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be specified for matching all IPv4 addresses, and ::/0 may be specified
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for matching all IPv6 addresses.'';
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};
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endpoint = mkOption {
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default = null;
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example = "demo.wireguard.io:12913";
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type = with types; nullOr str;
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description = ''Endpoint IP or hostname of the peer, followed by a colon,
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and then a port number of the peer.'';
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};
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persistentKeepalive = mkOption {
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default = null;
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type = with types; nullOr int;
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example = 25;
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description = ''This is optional and is by default off, because most
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users will not need it. It represents, in seconds, between 1 and 65535
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inclusive, how often to send an authenticated empty packet to the peer,
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for the purpose of keeping a stateful firewall or NAT mapping valid
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persistently. For example, if the interface very rarely sends traffic,
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but it might at anytime receive traffic from a peer, and it is behind
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NAT, the interface might benefit from having a persistent keepalive
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interval of 25 seconds; however, most users will not need this.'';
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};
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};
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};
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ipCommand = "${pkgs.iproute}/bin/ip";
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wgCommand = "${pkgs.wireguard}/bin/wg";
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generateUnit = name: values:
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# exactly one way to specify the private key must be set
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assert (values.privateKey != null) != (values.privateKeyFile != null);
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let privKey = if values.privateKeyFile != null then values.privateKeyFile else pkgs.writeText "wg-key" values.privateKey;
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in
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nameValuePair "wireguard-${name}"
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{
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description = "WireGuard Tunnel - ${name}";
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after = [ "network.target" ];
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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Type = "oneshot";
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RemainAfterExit = true;
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ExecStart = flatten([
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values.preSetup
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"-${ipCommand} link del dev ${name}"
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"${ipCommand} link add dev ${name} type wireguard"
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(map (ip:
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"${ipCommand} address add ${ip} dev ${name}"
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) values.ips)
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("${wgCommand} set ${name} private-key ${privKey}" +
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optionalString (values.listenPort != null) " listen-port ${toString values.listenPort}")
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(map (peer:
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assert (peer.presharedKeyFile == null) || (peer.presharedKey == null); # at most one of the two must be set
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let psk = if peer.presharedKey != null then pkgs.writeText "wg-psk" peer.presharedKey else peer.presharedKeyFile;
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in
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"${wgCommand} set ${name} peer ${peer.publicKey}" +
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optionalString (psk != null) " preshared-key ${psk}" +
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optionalString (peer.endpoint != null) " endpoint ${peer.endpoint}" +
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optionalString (peer.persistentKeepalive != null) " persistent-keepalive ${toString peer.persistentKeepalive}" +
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optionalString (peer.allowedIPs != []) " allowed-ips ${concatStringsSep "," peer.allowedIPs}"
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) values.peers)
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"${ipCommand} link set up dev ${name}"
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(map (peer:
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(map (allowedIP:
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"${ipCommand} route replace ${allowedIP} dev ${name} table ${values.table}"
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) peer.allowedIPs)
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) values.peers)
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values.postSetup
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]);
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ExecStop = flatten([
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"${ipCommand} link del dev ${name}"
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values.postShutdown
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]);
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};
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};
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in
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{
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###### interface
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options = {
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networking.wireguard = {
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interfaces = mkOption {
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description = "Wireguard interfaces.";
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default = {};
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example = {
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wg0 = {
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ips = [ "192.168.20.4/24" ];
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privateKey = "yAnz5TF+lXXJte14tji3zlMNq+hd2rYUIgJBgB3fBmk=";
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peers = [
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{ allowedIPs = [ "192.168.20.1/32" ];
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publicKey = "xTIBA5rboUvnH4htodjb6e697QjLERt1NAB4mZqp8Dg=";
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endpoint = "demo.wireguard.io:12913"; }
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];
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};
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};
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type = with types; attrsOf (submodule interfaceOpts);
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};
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};
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};
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###### implementation
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config = mkIf (cfg.interfaces != {}) {
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boot.extraModulePackages = [ kernel.wireguard ];
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environment.systemPackages = [ pkgs.wireguard ];
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systemd.services = mapAttrs' generateUnit cfg.interfaces;
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};
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}
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