105 lines
3.4 KiB
Nix
105 lines
3.4 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.boot.initrd.network.wireguard;
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in
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{
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options = {
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boot.initrd.network.wireguard = {
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enable = mkEnableOption "Wireguard in initrd";
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privateKeyFile = mkOption {
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type = with types; nullOr str;
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default = null;
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description = "Path to file containing private key for wireguard interface";
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};
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ipv6s = mkOption {
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type = with types; listOf str;
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default = [];
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description = "IPv6 interface addresses";
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};
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ipv4s = mkOption {
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type = with types; listOf str;
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default = [];
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description = "IPv4 interface addresses";
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};
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};
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};
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config = mkIf cfg.enable {
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boot.initrd.kernelModules = [ "wireguard" ];
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boot.initrd.extraUtilsCommands = ''
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for BIN in ${pkgs.iproute2}/bin/*; do
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copy_bin_and_libs $BIN
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done
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[ -f "$out/bin/wg" ] && rm "$out/bin/wg"
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cp -pdv ${pkgs.wireguard-tools}/bin/.wg-wrapped $out/bin/wg
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'';
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boot.initrd.network.postCommands = ''
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ip link add dev "wg-initrd" type wireguard
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ip link set "wg-initrd" mtu 1280
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${concatMapStringsSep "\n" (ip: ''
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ip address add "${ip}" dev "wg-initrd"
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'') cfg.ipv6s}
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${concatMapStringsSep "\n" (ip: ''
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ip address add "${ip}" dev "wg-initrd"
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'') cfg.ipv4s}
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wg set "wg-initrd" private-key "/var/src/secrets/wireguard/wg-initrd"
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ip link set up "wg-initrd"
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wg set "wg-initrd" peer "2p1Jqs3bkXbXHFWE6vp1yxHIFoUaZQEARS2nJzbkuBA=" \
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endpoint "$(ip route get 2a01:4f8:c0c:15f1::1 ipproto udp dport 51820 &>/dev/null && echo '[2a01:4f8:c0c:15f1::1]:51820' || echo '78.47.183.82:51820')" \
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persistent-keepalive "25" \
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allowed-ips "0.0.0.0/0,::/0,10.20.30.0/24,2a01:4f8:c0c:15f1::/113"
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ip route add "::/0" dev "wg-initrd" table 1337
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ip route add "0.0.0.0/0" dev "wg-initrd" table 1337
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# Error: Argument "udp" is wrong: Invalid "ipproto" value
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# For some reason ip rule does not recognize "udp" as a value for "ipproto" in initrd,
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# so we pass the numeric value for it manually
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# This is from linux/include/uapi/linux/in.h
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IPPROTO_UDP=17
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${concatMapStringsSep "\n" (ip: ''
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ip -6 rule add from "${ip}" lookup 1337 prio 19000
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ip -6 rule add from "${ip}" unreachable prio 19001
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'') cfg.ipv6s}
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ip -6 rule add to "2a01:4f8:c0c:15f1::1/128" ipproto $IPPROTO_UDP dport 51820 lookup main prio 20000
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ip -6 rule add to "2a01:4f8:c0c:15f1::1/128" ipproto $IPPROTO_UDP dport 51820 unreachable prio 20001
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ip -6 rule add lookup main prio 21000
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ip -6 rule add lookup 1337 prio 21001
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ip -6 rule add unreachable prio 21000
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${concatMapStringsSep "\n" (ip: ''
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ip -4 rule add from "${ip}" lookup 1337 prio 19000
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ip -4 rule add from "${ip}" unreachable prio 19001
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'') cfg.ipv4s}
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ip -4 rule add to "78.47.183.82/32" ipproto $IPPROTO_UDP dport 51820 lookup main prio 20000
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ip -4 rule add to "78.47.183.82/32" ipproto $IPPROTO_UDP dport 51820 unreachable prio 20001
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ip -4 rule add lookup main prio 21000
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ip -4 rule add lookup 1337 prio 21001
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ip -4 rule add unreachable prio 21000
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'';
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boot.initrd.postMountCommands = ''
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ip link del dev "wg-initrd"
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ip -6 rule flush
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ip -4 rule flush
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'';
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boot.initrd.secrets = {
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"/var/src/secrets/wireguard/wg-initrd" = cfg.privateKeyFile;
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};
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};
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}
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