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abf60791e2
This is an implementation of wireguard support using wg-quick config generation. This seems preferrable to the existing wireguard support because it handles many more routing and resolvconf edge cases than the current wireguard support. It also includes work-arounds to make key files work. This has one quirk: We need to set reverse path checking in the firewall to false because it interferes with the way wg-quick sets up its routing.
313 lines
11 KiB
Nix
313 lines
11 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.networking.wg-quick;
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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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address = 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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dns = mkOption {
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example = [ "192.168.2.2" ];
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default = [];
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type = with types; listOf str;
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description = "The IP addresses of DNS servers to configure.";
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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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preUp = mkOption {
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example = literalExample ''
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${pkgs.iproute}/bin/ip netns add foo
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'';
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default = "";
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type = with types; coercedTo (listOf str) (concatStringsSep "\n") lines;
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description = ''
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Commands called at the start of the interface setup.
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'';
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};
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preDown = mkOption {
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example = literalExample ''
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${pkgs.iproute}/bin/ip netns del foo
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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 = ''
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Command called before the interface is taken down.
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'';
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};
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postUp = mkOption {
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example = literalExample ''
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${pkgs.iproute}/bin/ip netns add foo
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'';
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default = "";
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type = with types; coercedTo (listOf str) (concatStringsSep "\n") lines;
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description = ''
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Commands called after the interface setup.
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'';
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};
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postDown = mkOption {
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example = literalExample ''
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${pkgs.iproute}/bin/ip netns del foo
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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 = ''
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Command called after the interface is taken down.
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'';
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};
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table = mkOption {
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example = "main";
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default = null;
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type = with types; nullOr 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 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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};
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mtu = mkOption {
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example = 1248;
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default = null;
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type = with types; nullOr int;
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description = ''
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If not specified, the MTU is automatically determined
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from the endpoint addresses or the system default route, which is usually
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a sane choice. However, to manually specify an MTU to override this
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automatic discovery, this value may be specified explicitly.
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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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};
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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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writeScriptFile = name: text: ((pkgs.writeShellScriptBin name text) + "/bin/${name}");
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generateUnit = name: values:
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assert assertMsg ((values.privateKey != null) != (values.privateKeyFile != null)) "Only one of privateKey or privateKeyFile may be set";
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let
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preUpFile = if values.preUp != "" then writeScriptFile "preUp.sh" values.preUp else null;
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postUp =
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optional (values.privateKeyFile != null) "wg set ${name} private-key <(cat ${values.privateKeyFile})" ++
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(concatMap (peer: optional (peer.presharedKeyFile != null) "wg set ${name} peer ${peer.publicKey} preshared-key <(cat ${peer.presharedKeyFile})") values.peers) ++
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optional (values.postUp != null) values.postUp;
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postUpFile = if postUp != [] then writeScriptFile "postUp.sh" (concatMapStringsSep "\n" (line: line) postUp) else null;
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preDownFile = if values.preDown != "" then writeScriptFile "preDown.sh" values.preDown else null;
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postDownFile = if values.postDown != "" then writeScriptFile "postDown.sh" values.postDown else null;
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configDir = pkgs.writeTextFile {
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name = "config-${name}";
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executable = false;
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destination = "/${name}.conf";
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text =
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''
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[interface]
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${concatMapStringsSep "\n" (address:
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"Address = ${address}"
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) values.address}
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${concatMapStringsSep "\n" (dns:
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"DNS = ${dns}"
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) values.dns}
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'' +
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optionalString (values.table != null) "Table = ${values.table}\n" +
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optionalString (values.mtu != null) "MTU = ${toString values.mtu}\n" +
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optionalString (values.privateKey != null) "PrivateKey = ${values.privateKey}\n" +
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optionalString (values.listenPort != null) "ListenPort = ${toString values.listenPort}\n" +
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optionalString (preUpFile != null) "PreUp = ${preUpFile}\n" +
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optionalString (postUpFile != null) "PostUp = ${postUpFile}\n" +
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optionalString (preDownFile != null) "PreDown = ${preDownFile}\n" +
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optionalString (postDownFile != null) "PostDown = ${postDownFile}\n" +
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concatMapStringsSep "\n" (peer:
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assert assertMsg (!((peer.presharedKeyFile != null) && (peer.presharedKey != null))) "Only one of presharedKey or presharedKeyFile may be set";
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"[Peer]\n" +
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"PublicKey = ${peer.publicKey}\n" +
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optionalString (peer.presharedKey != null) "PresharedKey = ${peer.presharedKey}\n" +
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optionalString (peer.endpoint != null) "Endpoint = ${peer.endpoint}\n" +
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optionalString (peer.persistentKeepalive != null) "PersistentKeepalive = ${toString peer.persistentKeepalive}\n" +
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optionalString (peer.allowedIPs != []) "AllowedIPs = ${concatStringsSep "," peer.allowedIPs}\n"
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) values.peers;
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};
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configPath = "${configDir}/${name}.conf";
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in
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nameValuePair "wg-quick-${name}"
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{
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description = "wg-quick WireGuard Tunnel - ${name}";
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requires = [ "network-online.target" ];
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after = [ "network.target" "network-online.target" ];
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wantedBy = [ "multi-user.target" ];
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environment.DEVICE = name;
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path = [ pkgs.kmod pkgs.wireguard-tools ];
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serviceConfig = {
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Type = "oneshot";
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RemainAfterExit = true;
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};
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script = ''
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${optionalString (!config.boot.isContainer) "modprobe wireguard"}
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wg-quick up ${configPath}
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'';
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preStop = ''
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wg-quick down ${configPath}
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'';
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};
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in {
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###### interface
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options = {
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networking.wg-quick = {
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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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address = [ "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-tools ];
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# This is forced to false for now because the default "--validmark" rpfilter we apply on reverse path filtering
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# breaks the wg-quick routing because wireguard packets leave with a fwmark from wireguard.
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networking.firewall.checkReversePath = false;
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systemd.services = mapAttrs' generateUnit cfg.interfaces;
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};
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}
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