612 lines
22 KiB
Nix
612 lines
22 KiB
Nix
{ config, lib, options, pkgs, ... }:
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with lib;
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let
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cfg = config.networking.wireguard;
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opt = options.networking.wireguard;
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kernel = config.boot.kernelPackages;
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# interface options
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interfaceOpts = { ... }: {
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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 {command}`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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generatePrivateKeyFile = mkOption {
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default = false;
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type = types.bool;
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description = ''
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Automatically generate a private key with
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{command}`wg genkey`, at the privateKeyFile location.
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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 {command}`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 = literalExpression ''"''${pkgs.iproute2}/bin/ip netns add foo"'';
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default = "";
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type = with types; coercedTo (listOf str) (concatStringsSep "\n") lines;
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description = ''
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Commands called at the start of the interface setup.
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'';
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};
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postSetup = mkOption {
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example = literalExpression ''
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'''printf "nameserver 10.200.100.1" | ''${pkgs.openresolv}/bin/resolvconf -a wg0 -m 0'''
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'';
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default = "";
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type = with types; coercedTo (listOf str) (concatStringsSep "\n") lines;
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description = "Commands called at the end of the interface setup.";
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};
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preShutdown = mkOption {
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example = literalExpression ''"''${pkgs.iproute2}/bin/ip netns del foo"'';
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default = "";
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type = with types; coercedTo (listOf str) (concatStringsSep "\n") lines;
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description = ''
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Commands called before shutting down the interface.
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'';
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};
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postShutdown = mkOption {
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example = literalExpression ''"''${pkgs.openresolv}/bin/resolvconf -d wg0"'';
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default = "";
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type = with types; coercedTo (listOf str) (concatStringsSep "\n") lines;
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description = "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 = ''
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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
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numeric table IDs and table names (/etc/rt_tables) can be used.
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Defaults to "main".
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'';
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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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allowedIPsAsRoutes = mkOption {
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example = false;
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default = true;
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type = types.bool;
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description = ''
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Determines whether to add allowed IPs as routes or not.
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'';
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};
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socketNamespace = mkOption {
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default = null;
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type = with types; nullOr str;
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example = "container";
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description = ''The pre-existing network namespace in which the
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WireGuard interface is created, and which retains the socket even if the
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interface is moved via {option}`interfaceNamespace`. When
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`null`, the interface is created in the init namespace.
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See [documentation](https://www.wireguard.com/netns/).
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'';
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};
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interfaceNamespace = mkOption {
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default = null;
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type = with types; nullOr str;
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example = "init";
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description = ''The pre-existing network namespace the WireGuard
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interface is moved to. The special value `init` means
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the init namespace. When `null`, the interface is not
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moved.
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See [documentation](https://www.wireguard.com/netns/).
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'';
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};
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fwMark = mkOption {
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default = null;
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type = with types; nullOr str;
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example = "0x6e6978";
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description = ''
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Mark all wireguard packets originating from
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this interface with the given firewall mark. The firewall mark can be
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used in firewalls or policy routing to filter the wireguard packets.
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This can be useful for setup where all traffic goes through the
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wireguard tunnel, because the wireguard packets need to be routed
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differently.
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'';
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};
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mtu = mkOption {
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default = null;
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type = with types; nullOr int;
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example = 1280;
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description = ''
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Set the maximum transmission unit in bytes for the wireguard
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interface. Beware that the wireguard packets have a header that may
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add up to 80 bytes to the mtu. By default, the MTU is (1500 - 80) =
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1420. However, if the MTU of the upstream network is lower, the MTU
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of the wireguard network has to be adjusted as well.
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'';
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};
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metric = mkOption {
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default = null;
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type = with types; nullOr int;
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example = 700;
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description = ''
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Set the metric of routes related to this Wireguard interface.
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'';
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};
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};
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};
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# peer options
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peerOpts = self: {
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options = {
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name = mkOption {
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default =
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replaceStrings
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[ "/" "-" " " "+" "=" ]
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[ "-" "\\x2d" "\\x20" "\\x2b" "\\x3d" ]
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self.config.publicKey;
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defaultText = literalExpression "publicKey";
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example = "bernd";
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type = types.str;
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description = "Name used to derive peer unit name.";
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};
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publicKey = mkOption {
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example = "xTIBA5rboUvnH4htodjb6e697QjLERt1NAB4mZqp8Dg=";
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type = types.singleLineStr;
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description = "The base64 public key of 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 {command}`wg genpsk`.
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Optional, 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 {command}`wg genpsk`.
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Optional, 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 = ''
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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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Warning for endpoints with changing IPs:
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The WireGuard kernel side cannot perform DNS resolution.
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Thus DNS resolution is done once by the `wg` userspace
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utility, when setting up WireGuard. Consequently, if the IP address
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behind the name changes, WireGuard will not notice.
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This is especially common for dynamic-DNS setups, but also applies to
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any other DNS-based setup.
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If you do not use IP endpoints, you likely want to set
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{option}`networking.wireguard.dynamicEndpointRefreshSeconds`
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to refresh the IPs periodically.
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'';
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};
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dynamicEndpointRefreshSeconds = mkOption {
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default = 0;
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example = 5;
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type = with types; int;
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description = ''
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Periodically re-execute the `wg` utility every
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this many seconds in order to let WireGuard notice DNS / hostname
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changes.
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Setting this to `0` disables periodic reexecution.
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'';
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};
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dynamicEndpointRefreshRestartSeconds = mkOption {
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default = null;
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example = 5;
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type = with types; nullOr ints.unsigned;
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description = ''
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When the dynamic endpoint refresh that is configured via
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dynamicEndpointRefreshSeconds exits (likely due to a failure),
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restart that service after this many seconds.
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If set to `null` the value of
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{option}`networking.wireguard.dynamicEndpointRefreshSeconds`
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will be used as the default.
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'';
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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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generateKeyServiceUnit = name: values:
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assert values.generatePrivateKeyFile;
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nameValuePair "wireguard-${name}-key"
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{
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description = "WireGuard Tunnel - ${name} - Key Generator";
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wantedBy = [ "wireguard-${name}.service" ];
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requiredBy = [ "wireguard-${name}.service" ];
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before = [ "wireguard-${name}.service" ];
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path = with pkgs; [ wireguard-tools ];
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serviceConfig = {
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Type = "oneshot";
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RemainAfterExit = true;
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};
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script = ''
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set -e
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# If the parent dir does not already exist, create it.
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# Otherwise, does nothing, keeping existing permissions intact.
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mkdir -p --mode 0755 "${dirOf values.privateKeyFile}"
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if [ ! -f "${values.privateKeyFile}" ]; then
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# Write private key file with atomically-correct permissions.
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(set -e; umask 077; wg genkey > "${values.privateKeyFile}")
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fi
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'';
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};
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peerUnitServiceName = interfaceName: peerName: dynamicRefreshEnabled:
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let
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refreshSuffix = optionalString dynamicRefreshEnabled "-refresh";
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in
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"wireguard-${interfaceName}-peer-${peerName}${refreshSuffix}";
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generatePeerUnit = { interfaceName, interfaceCfg, peer }:
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let
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psk =
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if peer.presharedKey != null
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then pkgs.writeText "wg-psk" peer.presharedKey
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else peer.presharedKeyFile;
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src = interfaceCfg.socketNamespace;
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dst = interfaceCfg.interfaceNamespace;
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ip = nsWrap "ip" src dst;
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wg = nsWrap "wg" src dst;
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dynamicRefreshEnabled = peer.dynamicEndpointRefreshSeconds != 0;
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# We generate a different name (a `-refresh` suffix) when `dynamicEndpointRefreshSeconds`
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# to avoid that the same service switches `Type` (`oneshot` vs `simple`),
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# with the intent to make scripting more obvious.
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serviceName = peerUnitServiceName interfaceName peer.name dynamicRefreshEnabled;
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in nameValuePair serviceName
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{
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description = "WireGuard Peer - ${interfaceName} - ${peer.name}"
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+ optionalString (peer.name != peer.publicKey) " (${peer.publicKey})";
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requires = [ "wireguard-${interfaceName}.service" ];
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wants = [ "network-online.target" ];
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after = [ "wireguard-${interfaceName}.service" "network-online.target" ];
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wantedBy = [ "wireguard-${interfaceName}.service" ];
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environment.DEVICE = interfaceName;
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environment.WG_ENDPOINT_RESOLUTION_RETRIES = "infinity";
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path = with pkgs; [ iproute2 wireguard-tools ];
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serviceConfig =
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if !dynamicRefreshEnabled
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then
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{
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Type = "oneshot";
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RemainAfterExit = true;
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}
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else
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{
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Type = "simple"; # re-executes 'wg' indefinitely
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# Note that `Type = "oneshot"` services with `RemainAfterExit = true`
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# cannot be used with systemd timers (see `man systemd.timer`),
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# which is why `simple` with a loop is the best choice here.
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# It also makes starting and stopping easiest.
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#
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# Restart if the service exits (e.g. when wireguard gives up after "Name or service not known" dns failures):
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Restart = "always";
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RestartSec = if null != peer.dynamicEndpointRefreshRestartSeconds
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then peer.dynamicEndpointRefreshRestartSeconds
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else peer.dynamicEndpointRefreshSeconds;
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};
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unitConfig = lib.optionalAttrs dynamicRefreshEnabled {
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StartLimitIntervalSec = 0;
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};
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script = let
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wg_setup = concatStringsSep " " (
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[ ''${wg} set ${interfaceName} peer "${peer.publicKey}"'' ]
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++ optional (psk != null) ''preshared-key "${psk}"''
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++ optional (peer.endpoint != null) ''endpoint "${peer.endpoint}"''
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++ optional (peer.persistentKeepalive != null) ''persistent-keepalive "${toString peer.persistentKeepalive}"''
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++ optional (peer.allowedIPs != []) ''allowed-ips "${concatStringsSep "," peer.allowedIPs}"''
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);
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route_setup =
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optionalString interfaceCfg.allowedIPsAsRoutes
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(concatMapStringsSep "\n"
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(allowedIP:
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''${ip} route replace "${allowedIP}" dev "${interfaceName}" table "${interfaceCfg.table}" ${optionalString (interfaceCfg.metric != null) "metric ${toString interfaceCfg.metric}"}''
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) peer.allowedIPs);
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in ''
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${wg_setup}
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${route_setup}
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${optionalString (peer.dynamicEndpointRefreshSeconds != 0) ''
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# Re-execute 'wg' periodically to notice DNS / hostname changes.
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# Note this will not time out on transient DNS failures such as DNS names
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# because we have set 'WG_ENDPOINT_RESOLUTION_RETRIES=infinity'.
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# Also note that 'wg' limits its maximum retry delay to 20 seconds as of writing.
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while ${wg_setup}; do
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sleep "${toString peer.dynamicEndpointRefreshSeconds}";
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done
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''}
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'';
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postStop = let
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route_destroy = optionalString interfaceCfg.allowedIPsAsRoutes
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(concatMapStringsSep "\n"
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(allowedIP:
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''${ip} route delete "${allowedIP}" dev "${interfaceName}" table "${interfaceCfg.table}"''
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) peer.allowedIPs);
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in ''
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${wg} set "${interfaceName}" peer "${peer.publicKey}" remove
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${route_destroy}
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'';
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};
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# the target is required to start new peer units when they are added
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generateInterfaceTarget = name: values:
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let
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mkPeerUnit = peer: (peerUnitServiceName name peer.name (peer.dynamicEndpointRefreshSeconds != 0)) + ".service";
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in
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nameValuePair "wireguard-${name}"
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rec {
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description = "WireGuard Tunnel - ${name}";
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wantedBy = [ "multi-user.target" ];
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wants = [ "wireguard-${name}.service" ] ++ map mkPeerUnit values.peers;
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after = wants;
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};
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generateInterfaceUnit = 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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src = values.socketNamespace;
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dst = values.interfaceNamespace;
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ipPreMove = nsWrap "ip" src null;
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ipPostMove = nsWrap "ip" src dst;
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wg = nsWrap "wg" src dst;
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ns = if dst == "init" then "1" else dst;
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in
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nameValuePair "wireguard-${name}"
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{
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description = "WireGuard Tunnel - ${name}";
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after = [ "network-pre.target" ];
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wants = [ "network.target" ];
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before = [ "network.target" ];
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environment.DEVICE = name;
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path = with pkgs; [ kmod iproute2 wireguard-tools ];
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serviceConfig = {
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Type = "oneshot";
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RemainAfterExit = true;
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};
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script = ''
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${optionalString (!config.boot.isContainer) "modprobe wireguard || true"}
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${values.preSetup}
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${ipPreMove} link add dev "${name}" type wireguard
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${optionalString (values.interfaceNamespace != null && values.interfaceNamespace != values.socketNamespace) ''${ipPreMove} link set "${name}" netns "${ns}"''}
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${optionalString (values.mtu != null) ''${ipPostMove} link set "${name}" mtu ${toString values.mtu}''}
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${concatMapStringsSep "\n" (ip:
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''${ipPostMove} address add "${ip}" dev "${name}"''
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) values.ips}
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${concatStringsSep " " (
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[ ''${wg} set "${name}" private-key "${privKey}"'' ]
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++ optional (values.listenPort != null) ''listen-port "${toString values.listenPort}"''
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++ optional (values.fwMark != null) ''fwmark "${values.fwMark}"''
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)}
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${ipPostMove} link set up dev "${name}"
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${values.postSetup}
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'';
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postStop = ''
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${values.preShutdown}
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${ipPostMove} link del dev "${name}"
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${values.postShutdown}
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'';
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};
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nsWrap = cmd: src: dst:
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let
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nsList = filter (ns: ns != null) [ src dst ];
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ns = last nsList;
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in
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if (length nsList > 0 && ns != "init") then ''ip netns exec "${ns}" "${cmd}"'' else cmd;
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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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enable = mkOption {
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description = ''
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Whether to enable WireGuard.
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Please note that {option}`systemd.network.netdevs` has more features
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and is better maintained. When building new things, it is advised to
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use that instead.
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'';
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type = types.bool;
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# 2019-05-25: Backwards compatibility.
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default = cfg.interfaces != {};
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defaultText = literalExpression "config.${opt.interfaces} != { }";
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example = true;
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};
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interfaces = mkOption {
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description = ''
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WireGuard interfaces.
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Please note that {option}`systemd.network.netdevs` has more features
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and is better maintained. When building new things, it is advised to
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use that instead.
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'';
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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.enable (let
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all_peers = flatten
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(mapAttrsToList (interfaceName: interfaceCfg:
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map (peer: { inherit interfaceName interfaceCfg peer;}) interfaceCfg.peers
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) cfg.interfaces);
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in {
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assertions = (attrValues (
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mapAttrs (name: value: {
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assertion = (value.privateKey != null) != (value.privateKeyFile != null);
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message = "Either networking.wireguard.interfaces.${name}.privateKey or networking.wireguard.interfaces.${name}.privateKeyFile must be set.";
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}) cfg.interfaces))
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++ (attrValues (
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mapAttrs (name: value: {
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assertion = value.generatePrivateKeyFile -> (value.privateKey == null);
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message = "networking.wireguard.interfaces.${name}.generatePrivateKeyFile must not be set if networking.wireguard.interfaces.${name}.privateKey is set.";
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}) cfg.interfaces))
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++ map ({ interfaceName, peer, ... }: {
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assertion = (peer.presharedKey == null) || (peer.presharedKeyFile == null);
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message = "networking.wireguard.interfaces.${interfaceName} peer «${peer.publicKey}» has both presharedKey and presharedKeyFile set, but only one can be used.";
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}) all_peers;
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boot.extraModulePackages = optional (versionOlder kernel.kernel.version "5.6") kernel.wireguard;
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boot.kernelModules = [ "wireguard" ];
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environment.systemPackages = [ pkgs.wireguard-tools ];
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systemd.services =
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(mapAttrs' generateInterfaceUnit cfg.interfaces)
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// (listToAttrs (map generatePeerUnit all_peers))
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// (mapAttrs' generateKeyServiceUnit
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(filterAttrs (name: value: value.generatePrivateKeyFile) cfg.interfaces));
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systemd.targets = mapAttrs' generateInterfaceTarget cfg.interfaces;
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}
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);
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}
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