123 lines
3.8 KiB
Nix
123 lines
3.8 KiB
Nix
# Portions of this file are sourced from
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# https://github.com/NickCao/flakes/blob/3b03efb676ea602575c916b2b8bc9d9cd13b0d85/modules/gravity/default.nix
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{
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config,
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lib,
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pkgs,
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...
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}:
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with lib;
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let
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cfg = config.services.enthalpy;
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in
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{
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options.services.enthalpy = {
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services = mkOption {
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type = types.attrsOf (
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types.submodule {
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options = {
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overrideStrategy = mkOption {
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type = types.str;
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default = "asDropinIfExists";
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};
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};
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}
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);
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default = { };
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description = ''
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Services that need to run inside the enthalpy network namespace.
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'';
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};
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users = mkOption {
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type = types.attrsOf (types.submodule { });
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default = { };
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description = ''
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Users utilizing the enthalpy network namespace.
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'';
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};
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};
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config = mkIf cfg.enable (mkMerge [
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{
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systemd.services = mapAttrs (_name: value: {
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inherit (value) overrideStrategy;
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serviceConfig = {
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NetworkNamespacePath = "/run/netns/${cfg.netns}";
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BindReadOnlyPaths = [
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"/etc/netns/${cfg.netns}/resolv.conf:/etc/resolv.conf:norbind"
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"/etc/netns/${cfg.netns}/nsswitch.conf:/etc/nsswitch.conf:norbind"
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"/run/enthalpy/nscd:/run/nscd:norbind"
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];
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};
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after = [ "enthalpy.service" ];
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requires = [ "enthalpy.service" ];
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}) cfg.services;
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services.enthalpy.services = mapAttrs' (
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name: _value:
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nameValuePair "user@${toString config.users.users.${name}.uid}" {
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overrideStrategy = "asDropin";
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}
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) cfg.users;
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}
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# https://philipdeljanov.com/posts/2019/05/31/dns-leaks-with-network-namespaces
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# https://flokli.de/posts/2022-11-18-nsncd
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(mkIf (cfg.services != { }) {
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environment.etc."netns/enthalpy/resolv.conf".text = mkDefault ''
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nameserver 2606:4700:4700::1111
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'';
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environment.etc."netns/enthalpy/nsswitch.conf".text = ''
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passwd: ${concatStringsSep " " config.system.nssDatabases.passwd}
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group: ${concatStringsSep " " config.system.nssDatabases.group}
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shadow: ${concatStringsSep " " config.system.nssDatabases.shadow}
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sudoers: ${concatStringsSep " " config.system.nssDatabases.sudoers}
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hosts: ${concatStringsSep " " (remove "resolve [!UNAVAIL=return]" config.system.nssDatabases.hosts)}
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networks: files
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ethers: files
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services: ${concatStringsSep " " config.system.nssDatabases.services}
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protocols: files
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rpc: files
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'';
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systemd.services.enthalpy-nsncd = {
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serviceConfig = {
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NetworkNamespacePath = "/run/netns/${cfg.netns}";
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BindReadOnlyPaths = [
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"/etc/netns/${cfg.netns}/resolv.conf:/etc/resolv.conf:norbind"
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"/etc/netns/${cfg.netns}/nsswitch.conf:/etc/nsswitch.conf:norbind"
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];
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BindPaths = [
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"/run/enthalpy/nscd:/run/nscd:norbind"
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];
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ExecStart = "${pkgs.nsncd}/bin/nsncd";
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Type = "notify";
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DynamicUser = true;
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RemoveIPC = true;
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NoNewPrivileges = true;
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RestrictSUIDSGID = true;
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ProtectSystem = "strict";
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ProtectHome = "read-only";
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ProtectKernelTunables = true;
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ProtectControlGroups = true;
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PrivateTmp = true;
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RuntimeDirectory = "enthalpy/nscd";
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Restart = "always";
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SystemCallFilter = "~@cpu-emulation @debug @keyring @module @mount @obsolete @raw-io";
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MemoryDenyWriteExecute = "yes";
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};
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environment.LD_LIBRARY_PATH = config.system.nssModules.path;
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after = [
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"enthalpy.service"
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"network.target"
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];
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requires = [ "enthalpy.service" ];
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wantedBy = [ "multi-user.target" ];
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};
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})
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]);
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}
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