711303952e
This makes the interface name available as an environment variable for the pre/post hooks.
288 lines
9.0 KiB
Nix
288 lines
9.0 KiB
Nix
{ config, lib, pkgs, ... }:
|
|
|
|
with lib;
|
|
|
|
let
|
|
|
|
cfg = config.networking.wireguard;
|
|
|
|
kernel = config.boot.kernelPackages;
|
|
|
|
# interface options
|
|
|
|
interfaceOpts = { name, ... }: {
|
|
|
|
options = {
|
|
|
|
ips = mkOption {
|
|
example = [ "192.168.2.1/24" ];
|
|
default = [];
|
|
type = with types; listOf str;
|
|
description = "The IP addresses of the interface.";
|
|
};
|
|
|
|
privateKey = mkOption {
|
|
example = "yAnz5TF+lXXJte14tji3zlMNq+hd2rYUIgJBgB3fBmk=";
|
|
type = with types; nullOr str;
|
|
default = null;
|
|
description = ''
|
|
Base64 private key generated by wg genkey.
|
|
|
|
Warning: Consider using privateKeyFile instead if you do not
|
|
want to store the key in the world-readable Nix store.
|
|
'';
|
|
};
|
|
|
|
privateKeyFile = mkOption {
|
|
example = "/private/wireguard_key";
|
|
type = with types; nullOr str;
|
|
default = null;
|
|
description = ''
|
|
Private key file as generated by wg genkey.
|
|
'';
|
|
};
|
|
|
|
listenPort = mkOption {
|
|
default = null;
|
|
type = with types; nullOr int;
|
|
example = 51820;
|
|
description = ''
|
|
16-bit port for listening. Optional; if not specified,
|
|
automatically generated based on interface name.
|
|
'';
|
|
};
|
|
|
|
preSetup = mkOption {
|
|
example = literalExample [''
|
|
${pkgs.iproute}/bin/ip netns add foo
|
|
''];
|
|
default = [];
|
|
type = with types; listOf str;
|
|
description = ''
|
|
A list of commands called at the start of the interface setup.
|
|
'';
|
|
};
|
|
|
|
postSetup = mkOption {
|
|
example = literalExample [''
|
|
${pkgs.bash} -c 'printf "nameserver 10.200.100.1" | ${pkgs.openresolv}/bin/resolvconf -a wg0 -m 0'
|
|
''];
|
|
default = [];
|
|
type = with types; listOf str;
|
|
description = "A list of commands called at the end of the interface setup.";
|
|
};
|
|
|
|
postShutdown = mkOption {
|
|
example = literalExample ["${pkgs.openresolv}/bin/resolvconf -d wg0"];
|
|
default = [];
|
|
type = with types; listOf str;
|
|
description = "A list of commands called after shutting down the interface.";
|
|
};
|
|
|
|
table = mkOption {
|
|
default = "main";
|
|
type = types.str;
|
|
description = ''The kernel routing table to add this interface's
|
|
associated routes to. Setting this is useful for e.g. policy routing
|
|
("ip rule") or virtual routing and forwarding ("ip vrf"). Both numeric
|
|
table IDs and table names (/etc/rt_tables) can be used. Defaults to
|
|
"main".'';
|
|
};
|
|
|
|
peers = mkOption {
|
|
default = [];
|
|
description = "Peers linked to the interface.";
|
|
type = with types; listOf (submodule peerOpts);
|
|
};
|
|
|
|
allowedIPsAsRoutes = mkOption {
|
|
example = false;
|
|
default = true;
|
|
type = types.bool;
|
|
description = ''
|
|
Determines whether to add allowed IPs as routes or not.
|
|
'';
|
|
};
|
|
};
|
|
|
|
};
|
|
|
|
# peer options
|
|
|
|
peerOpts = {
|
|
|
|
options = {
|
|
|
|
publicKey = mkOption {
|
|
example = "xTIBA5rboUvnH4htodjb6e697QjLERt1NAB4mZqp8Dg=";
|
|
type = types.str;
|
|
description = "The base64 public key the peer.";
|
|
};
|
|
|
|
presharedKey = mkOption {
|
|
default = null;
|
|
example = "rVXs/Ni9tu3oDBLS4hOyAUAa1qTWVA3loR8eL20os3I=";
|
|
type = with types; nullOr str;
|
|
description = ''
|
|
Base64 preshared key generated by wg genpsk. Optional,
|
|
and may be omitted. This option adds an additional layer of
|
|
symmetric-key cryptography to be mixed into the already existing
|
|
public-key cryptography, for post-quantum resistance.
|
|
|
|
Warning: Consider using presharedKeyFile instead if you do not
|
|
want to store the key in the world-readable Nix store.
|
|
'';
|
|
};
|
|
|
|
presharedKeyFile = mkOption {
|
|
default = null;
|
|
example = "/private/wireguard_psk";
|
|
type = with types; nullOr str;
|
|
description = ''
|
|
File pointing to preshared key as generated by wg pensk. Optional,
|
|
and may be omitted. This option adds an additional layer of
|
|
symmetric-key cryptography to be mixed into the already existing
|
|
public-key cryptography, for post-quantum resistance.
|
|
'';
|
|
};
|
|
|
|
allowedIPs = mkOption {
|
|
example = [ "10.192.122.3/32" "10.192.124.1/24" ];
|
|
type = with types; listOf str;
|
|
description = ''List of IP (v4 or v6) addresses with CIDR masks from
|
|
which this peer is allowed to send incoming traffic and to which
|
|
outgoing traffic for this peer is directed. The catch-all 0.0.0.0/0 may
|
|
be specified for matching all IPv4 addresses, and ::/0 may be specified
|
|
for matching all IPv6 addresses.'';
|
|
};
|
|
|
|
endpoint = mkOption {
|
|
default = null;
|
|
example = "demo.wireguard.io:12913";
|
|
type = with types; nullOr str;
|
|
description = ''Endpoint IP or hostname of the peer, followed by a colon,
|
|
and then a port number of the peer.'';
|
|
};
|
|
|
|
persistentKeepalive = mkOption {
|
|
default = null;
|
|
type = with types; nullOr int;
|
|
example = 25;
|
|
description = ''This is optional and is by default off, because most
|
|
users will not need it. It represents, in seconds, between 1 and 65535
|
|
inclusive, how often to send an authenticated empty packet to the peer,
|
|
for the purpose of keeping a stateful firewall or NAT mapping valid
|
|
persistently. For example, if the interface very rarely sends traffic,
|
|
but it might at anytime receive traffic from a peer, and it is behind
|
|
NAT, the interface might benefit from having a persistent keepalive
|
|
interval of 25 seconds; however, most users will not need this.'';
|
|
};
|
|
|
|
};
|
|
|
|
};
|
|
|
|
ipCommand = "${pkgs.iproute}/bin/ip";
|
|
wgCommand = "${pkgs.wireguard}/bin/wg";
|
|
|
|
generateUnit = name: values:
|
|
# exactly one way to specify the private key must be set
|
|
assert (values.privateKey != null) != (values.privateKeyFile != null);
|
|
let privKey = if values.privateKeyFile != null then values.privateKeyFile else pkgs.writeText "wg-key" values.privateKey;
|
|
in
|
|
nameValuePair "wireguard-${name}"
|
|
{
|
|
description = "WireGuard Tunnel - ${name}";
|
|
after = [ "network.target" ];
|
|
wantedBy = [ "multi-user.target" ];
|
|
environment.DEVICE = name;
|
|
|
|
serviceConfig = {
|
|
Type = "oneshot";
|
|
RemainAfterExit = true;
|
|
ExecStart = flatten([
|
|
values.preSetup
|
|
|
|
"-${ipCommand} link del dev ${name}"
|
|
"${ipCommand} link add dev ${name} type wireguard"
|
|
|
|
(map (ip:
|
|
"${ipCommand} address add ${ip} dev ${name}"
|
|
) values.ips)
|
|
|
|
("${wgCommand} set ${name} private-key ${privKey}" +
|
|
optionalString (values.listenPort != null) " listen-port ${toString values.listenPort}")
|
|
|
|
(map (peer:
|
|
assert (peer.presharedKeyFile == null) || (peer.presharedKey == null); # at most one of the two must be set
|
|
let psk = if peer.presharedKey != null then pkgs.writeText "wg-psk" peer.presharedKey else peer.presharedKeyFile;
|
|
in
|
|
"${wgCommand} set ${name} peer ${peer.publicKey}" +
|
|
optionalString (psk != null) " preshared-key ${psk}" +
|
|
optionalString (peer.endpoint != null) " endpoint ${peer.endpoint}" +
|
|
optionalString (peer.persistentKeepalive != null) " persistent-keepalive ${toString peer.persistentKeepalive}" +
|
|
optionalString (peer.allowedIPs != []) " allowed-ips ${concatStringsSep "," peer.allowedIPs}"
|
|
) values.peers)
|
|
|
|
"${ipCommand} link set up dev ${name}"
|
|
|
|
(optionals (values.allowedIPsAsRoutes != false) (map (peer:
|
|
(map (allowedIP:
|
|
"${ipCommand} route replace ${allowedIP} dev ${name} table ${values.table}"
|
|
) peer.allowedIPs)
|
|
) values.peers))
|
|
|
|
values.postSetup
|
|
]);
|
|
ExecStop = flatten([
|
|
"${ipCommand} link del dev ${name}"
|
|
values.postShutdown
|
|
]);
|
|
};
|
|
};
|
|
|
|
in
|
|
|
|
{
|
|
|
|
###### interface
|
|
|
|
options = {
|
|
|
|
networking.wireguard = {
|
|
|
|
interfaces = mkOption {
|
|
description = "Wireguard interfaces.";
|
|
default = {};
|
|
example = {
|
|
wg0 = {
|
|
ips = [ "192.168.20.4/24" ];
|
|
privateKey = "yAnz5TF+lXXJte14tji3zlMNq+hd2rYUIgJBgB3fBmk=";
|
|
peers = [
|
|
{ allowedIPs = [ "192.168.20.1/32" ];
|
|
publicKey = "xTIBA5rboUvnH4htodjb6e697QjLERt1NAB4mZqp8Dg=";
|
|
endpoint = "demo.wireguard.io:12913"; }
|
|
];
|
|
};
|
|
};
|
|
type = with types; attrsOf (submodule interfaceOpts);
|
|
};
|
|
|
|
};
|
|
|
|
};
|
|
|
|
|
|
###### implementation
|
|
|
|
config = mkIf (cfg.interfaces != {}) {
|
|
|
|
boot.extraModulePackages = [ kernel.wireguard ];
|
|
environment.systemPackages = [ pkgs.wireguard ];
|
|
|
|
systemd.services = mapAttrs' generateUnit cfg.interfaces;
|
|
|
|
};
|
|
|
|
}
|