63 lines
2.3 KiB
Nix
63 lines
2.3 KiB
Nix
with import <stockholm/lib>;
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{ config, pkgs, ... }: let
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self = config.krebs.build.host.nets.wiregrill;
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isRouter = !isNull self.via; # via "internet" is not set
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ext-if = config.makefu.server.primary-itf;
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in mkIf (hasAttr "wiregrill" config.krebs.build.host.nets) {
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#hack for modprobe inside containers
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systemd.services."wireguard-wiregrill".path = mkIf config.boot.isContainer (mkBefore [
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(pkgs.writeDashBin "modprobe" ":")
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]);
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boot.kernel.sysctl = mkIf isRouter {
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"net.ipv6.conf.all.forwarding" = 1;
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"net.ipv4.conf.all.forwarding" = 1;
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};
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networking.nat = {
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enable = true;
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externalInterface = ext-if;
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internalInterfaces = [ "wiregrill" ];
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};
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networking.firewall = {
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allowedUDPPorts = [ self.wireguard.port ];
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extraCommands = ''
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${pkgs.iptables}/bin/iptables -A FORWARD -i wiregrill -o wiregrill -j ACCEPT
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'';
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};
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networking.wireguard.interfaces.wiregrill = {
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postSetup = ''
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${pkgs.iptables}/bin/iptables -t nat -A POSTROUTING -s 10.220.245.0/24 -o ${ext-if} -j MASQUERADE
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${pkgs.iptables}/bin/ip6tables -t nat -A POSTROUTING -s 42::/16 -o ${ext-if} -j MASQUERADE
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'';
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# This undoes the above command
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postShutdown = ''
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${pkgs.iptables}/bin/iptables -t nat -D POSTROUTING -s 10.244.245.0/24 -o ${ext-if} -j MASQUERADE
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${pkgs.iptables}/bin/ip6tables -t nat -D POSTROUTING -s 42::/16 -o ${ext-if} -j MASQUERADE
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'';
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ips =
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(optional (!isNull self.ip4) self.ip4.addr) ++
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(optional (!isNull self.ip6) self.ip6.addr);
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listenPort = self.wireguard.port;
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privateKeyFile = (toString <secrets>) + "/wiregrill.key";
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allowedIPsAsRoutes = true;
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peers = mapAttrsToList
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(_: host: {
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allowedIPs = if isRouter then
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(optional (!isNull host.nets.wiregrill.ip4) host.nets.wiregrill.ip4.addr) ++
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(optional (!isNull host.nets.wiregrill.ip6) host.nets.wiregrill.ip6.addr)
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else
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host.nets.wiregrill.wireguard.subnets
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;
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endpoint = mkIf (!isNull host.nets.wiregrill.via) (host.nets.wiregrill.via.ip4.addr + ":${toString host.nets.wiregrill.wireguard.port}");
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persistentKeepalive = mkIf (!isNull host.nets.wiregrill.via) 61;
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publicKey = (replaceStrings ["\n"] [""] host.nets.wiregrill.wireguard.pubkey);
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})
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(filterAttrs (_: h: hasAttr "wiregrill" h.nets) config.krebs.hosts);
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};
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}
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