146 lines
4.4 KiB
Nix
146 lines
4.4 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.nbd;
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configFormat = pkgs.formats.ini { };
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iniFields = with types; attrsOf (oneOf [ bool int float str ]);
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serverConfig = configFormat.generate "nbd-server-config"
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({
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generic =
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(cfg.server.extraOptions // {
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user = "root";
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group = "root";
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port = cfg.server.listenPort;
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} // (optionalAttrs (cfg.server.listenAddress != null) {
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listenaddr = cfg.server.listenAddress;
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}));
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}
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// (mapAttrs
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(_: { path, allowAddresses, extraOptions }:
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extraOptions // {
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exportname = path;
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} // (optionalAttrs (allowAddresses != null) {
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authfile = pkgs.writeText "authfile" (concatStringsSep "\n" allowAddresses);
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}))
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cfg.server.exports)
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);
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splitLists =
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partition
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(path: hasPrefix "/dev/" path)
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(mapAttrsToList (_: { path, ... }: path) cfg.server.exports);
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allowedDevices = splitLists.right;
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boundPaths = splitLists.wrong;
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in
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{
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options = {
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services.nbd = {
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server = {
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enable = mkEnableOption "the Network Block Device (nbd) server";
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listenPort = mkOption {
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type = types.port;
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default = 10809;
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description = "Port to listen on. The port is NOT automatically opened in the firewall.";
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};
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extraOptions = mkOption {
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type = iniFields;
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default = {
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allowlist = false;
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};
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description = ''
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Extra options for the server. See
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<citerefentry><refentrytitle>nbd-server</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry>.
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'';
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};
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exports = mkOption {
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description = "Files or block devices to make available over the network.";
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default = { };
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type = with types; attrsOf
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(submodule {
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options = {
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path = mkOption {
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type = str;
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description = "File or block device to export.";
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example = "/dev/sdb1";
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};
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allowAddresses = mkOption {
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type = nullOr (listOf str);
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default = null;
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example = [ "10.10.0.0/24" "127.0.0.1" ];
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description = "IPs and subnets that are authorized to connect for this device. If not specified, the server will allow all connections.";
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};
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extraOptions = mkOption {
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type = iniFields;
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default = {
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flush = true;
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fua = true;
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};
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description = ''
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Extra options for this export. See
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<citerefentry><refentrytitle>nbd-server</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry>.
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'';
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};
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};
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});
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};
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listenAddress = mkOption {
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type = with types; nullOr str;
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description = "Address to listen on. If not specified, the server will listen on all interfaces.";
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default = null;
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example = "10.10.0.1";
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};
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};
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};
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};
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config = mkIf cfg.server.enable {
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boot.kernelModules = [ "nbd" ];
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systemd.services.nbd-server = {
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after = [ "network-online.target" ];
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before = [ "multi-user.target" ];
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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ExecStart = "${pkgs.nbd}/bin/nbd-server -C ${serverConfig}";
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Type = "forking";
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DeviceAllow = map (path: "${path} rw") allowedDevices;
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BindPaths = boundPaths;
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CapabilityBoundingSet = "";
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DevicePolicy = "closed";
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LockPersonality = true;
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MemoryDenyWriteExecute = true;
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NoNewPrivileges = true;
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PrivateDevices = false;
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PrivateMounts = true;
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PrivateTmp = true;
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PrivateUsers = true;
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ProcSubset = "pid";
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ProtectClock = true;
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ProtectControlGroups = true;
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ProtectHome = true;
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ProtectHostname = true;
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ProtectKernelLogs = true;
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ProtectKernelModules = true;
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ProtectKernelTunables = true;
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ProtectProc = "noaccess";
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ProtectSystem = "strict";
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RestrictAddressFamilies = "AF_INET AF_INET6";
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RestrictNamespaces = true;
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RestrictRealtime = true;
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RestrictSUIDSGID = true;
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UMask = "0077";
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};
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};
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};
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}
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