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87 lines
3.1 KiB
Nix
87 lines
3.1 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.tailscale;
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firewallOn = config.networking.firewall.enable;
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rpfMode = config.networking.firewall.checkReversePath;
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isNetworkd = config.networking.useNetworkd;
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rpfIsStrict = rpfMode == true || rpfMode == "strict";
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in {
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meta.maintainers = with maintainers; [ danderson mbaillie twitchyliquid64 ];
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options.services.tailscale = {
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enable = mkEnableOption (lib.mdDoc "Tailscale client daemon");
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port = mkOption {
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type = types.port;
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default = 41641;
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description = lib.mdDoc "The port to listen on for tunnel traffic (0=autoselect).";
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};
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interfaceName = mkOption {
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type = types.str;
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default = "tailscale0";
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description = lib.mdDoc ''The interface name for tunnel traffic. Use "userspace-networking" (beta) to not use TUN.'';
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};
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permitCertUid = mkOption {
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type = types.nullOr types.nonEmptyStr;
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default = null;
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description = lib.mdDoc "Username or user ID of the user allowed to to fetch Tailscale TLS certificates for the node.";
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};
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package = mkOption {
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type = types.package;
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default = pkgs.tailscale;
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defaultText = literalExpression "pkgs.tailscale";
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description = lib.mdDoc "The package to use for tailscale";
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};
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};
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config = mkIf cfg.enable {
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warnings = optional (firewallOn && rpfIsStrict) "Strict reverse path filtering breaks Tailscale exit node use and some subnet routing setups. Consider setting `networking.firewall.checkReversePath` = 'loose'";
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environment.systemPackages = [ cfg.package ]; # for the CLI
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systemd.packages = [ cfg.package ];
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systemd.services.tailscaled = {
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wantedBy = [ "multi-user.target" ];
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path = [
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config.networking.resolvconf.package # for configuring DNS in some configs
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pkgs.procps # for collecting running services (opt-in feature)
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pkgs.glibc # for `getent` to look up user shells
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];
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serviceConfig.Environment = [
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"PORT=${toString cfg.port}"
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''"FLAGS=--tun ${lib.escapeShellArg cfg.interfaceName}"''
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] ++ (lib.optionals (cfg.permitCertUid != null) [
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"TS_PERMIT_CERT_UID=${cfg.permitCertUid}"
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]);
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# Restart tailscaled with a single `systemctl restart` at the
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# end of activation, rather than a `stop` followed by a later
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# `start`. Activation over Tailscale can hang for tens of
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# seconds in the stop+start setup, if the activation script has
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# a significant delay between the stop and start phases
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# (e.g. script blocked on another unit with a slow shutdown).
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#
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# Tailscale is aware of the correctness tradeoff involved, and
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# already makes its upstream systemd unit robust against unit
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# version mismatches on restart for compatibility with other
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# linux distros.
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stopIfChanged = false;
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};
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networking.dhcpcd.denyInterfaces = [ cfg.interfaceName ];
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systemd.network.networks."50-tailscale" = mkIf isNetworkd {
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matchConfig = {
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Name = cfg.interfaceName;
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};
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linkConfig = {
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Unmanaged = true;
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ActivationPolicy = "manual";
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};
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};
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};
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}
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