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{ config, lib, pkgs, ... }:
let
cfg = config.services.lokinet;
dataDir = "/var/lib/lokinet";
settingsFormat = pkgs.formats.ini { listsAsDuplicateKeys = true; };
configFile = settingsFormat.generate "lokinet.ini" (lib.filterAttrsRecursive (n: v: v != null) cfg.settings);
in with lib; {
options.services.lokinet = {
enable = mkEnableOption (lib.mdDoc "Lokinet daemon");
package = mkPackageOption pkgs "lokinet" { };
useLocally = mkOption {
type = types.bool;
default = false;
example = true;
description = lib.mdDoc "Whether to use Lokinet locally.";
};
settings = mkOption {
type = with types;
submodule {
freeformType = settingsFormat.type;
options = {
dns = {
bind = mkOption {
type = str;
default = "127.3.2.1";
description = lib.mdDoc "Address to bind to for handling DNS requests.";
};
upstream = mkOption {
type = listOf str;
default = [ "9.9.9.10" ];
example = [ "1.1.1.1" "8.8.8.8" ];
description = lib.mdDoc ''
Upstream resolver(s) to use as fallback for non-loki addresses.
Multiple values accepted.
'';
};
};
network = {
exit = mkOption {
type = bool;
default = false;
description = lib.mdDoc ''
Whether to act as an exit node. Beware that this
increases demand on the server and may pose liability concerns.
Enable at your own risk.
'';
};
exit-node = mkOption {
type = nullOr (listOf str);
default = null;
example = ''
exit-node = [ "example.loki" ]; # maps all exit traffic to example.loki
exit-node = [ "example.loki:100.0.0.0/24" ]; # maps 100.0.0.0/24 to example.loki
'';
description = lib.mdDoc ''
Specify a `.loki` address and an optional ip range to use as an exit broker.
See <http://probably.loki/wiki/index.php?title=Exit_Nodes> for
a list of exit nodes.
'';
};
keyfile = mkOption {
type = nullOr str;
default = null;
example = "snappkey.private";
description = lib.mdDoc ''
The private key to persist address with. If not specified the address will be ephemeral.
This keyfile is generated automatically if the specified file doesn't exist.
'';
};
};
};
};
default = { };
example = literalExpression ''
{
dns = {
bind = "127.3.2.1";
upstream = [ "1.1.1.1" "8.8.8.8" ];
};
network.exit-node = [ "example.loki" "example2.loki" ];
}
'';
description = lib.mdDoc ''
Configuration for Lokinet.
Currently, the best way to view the available settings is by
generating a config file using `lokinet -g`.
'';
};
};
config = mkIf cfg.enable {
networking.resolvconf.extraConfig = mkIf cfg.useLocally ''
name_servers="${cfg.settings.dns.bind}"
'';
systemd.services.lokinet = {
description = "Lokinet";
after = [ "network-online.target" "network.target" ];
wants = [ "network-online.target" "network.target" ];
wantedBy = [ "multi-user.target" ];
preStart = ''
ln -sf ${cfg.package}/share/bootstrap.signed ${dataDir}
${pkgs.coreutils}/bin/install -m 600 ${configFile} ${dataDir}/lokinet.ini
${optionalString (cfg.settings.network.keyfile != null) ''
${pkgs.crudini}/bin/crudini --set ${dataDir}/lokinet.ini network keyfile "${dataDir}/${cfg.settings.network.keyfile}"
''}
'';
serviceConfig = {
DynamicUser = true;
StateDirectory = "lokinet";
AmbientCapabilities = [ "CAP_NET_ADMIN" "CAP_NET_BIND_SERVICE" ];
ExecStart = "${cfg.package}/bin/lokinet ${dataDir}/lokinet.ini";
Restart = "always";
RestartSec = "5s";
# hardening
LockPersonality = true;
MemoryDenyWriteExecute = true;
NoNewPrivileges = true;
PrivateTmp = true;
PrivateMounts = true;
ProtectControlGroups = true;
ProtectHome = true;
ProtectHostname = true;
ProtectKernelLogs = true;
ProtectKernelModules = true;
ProtectKernelTunables = true;
ProtectSystem = "strict";
ReadWritePaths = "/dev/net/tun";
RestrictAddressFamilies = [ "AF_UNIX" "AF_INET" "AF_INET6" "AF_NETLINK" ];
RestrictNamespaces = true;
RestrictRealtime = true;
RestrictSUIDSGID = true;
};
};
environment.systemPackages = [ cfg.package ];
};
}
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