131 lines
3.8 KiB
Nix
131 lines
3.8 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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nssModulesPath = config.system.nssModules.path;
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cfg = config.services.nscd;
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in
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{
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###### interface
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options = {
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services.nscd = {
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enable = mkOption {
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type = types.bool;
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default = true;
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description = lib.mdDoc ''
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Whether to enable the Name Service Cache Daemon.
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Disabling this is strongly discouraged, as this effectively disables NSS Lookups
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from all non-glibc NSS modules, including the ones provided by systemd.
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'';
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};
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user = mkOption {
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type = types.str;
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default = "nscd";
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description = ''
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User account under which nscd runs.
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'';
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};
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group = mkOption {
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type = types.str;
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default = "nscd";
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description = ''
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User group under which nscd runs.
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'';
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};
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config = mkOption {
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type = types.lines;
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default = builtins.readFile ./nscd.conf;
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description = lib.mdDoc "Configuration to use for Name Service Cache Daemon.";
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};
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package = mkOption {
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type = types.package;
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default = if pkgs.stdenv.hostPlatform.libc == "glibc"
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then pkgs.stdenv.cc.libc.bin
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else pkgs.glibc.bin;
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defaultText = lib.literalExpression ''
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if pkgs.stdenv.hostPlatform.libc == "glibc"
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then pkgs.stdenv.cc.libc.bin
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else pkgs.glibc.bin;
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'';
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description = lib.mdDoc "package containing the nscd binary to be used by the service";
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};
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};
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};
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###### implementation
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config = mkIf cfg.enable {
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environment.etc."nscd.conf".text = cfg.config;
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users.users.${cfg.user} = {
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isSystemUser = true;
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group = cfg.group;
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};
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users.groups.${cfg.group} = {};
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systemd.services.nscd =
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{ description = "Name Service Cache Daemon";
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before = [ "nss-lookup.target" "nss-user-lookup.target" ];
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wants = [ "nss-lookup.target" "nss-user-lookup.target" ];
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wantedBy = [ "multi-user.target" ];
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requiredBy = [ "nss-lookup.target" "nss-user-lookup.target" ];
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environment = { LD_LIBRARY_PATH = nssModulesPath; };
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restartTriggers = [
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config.environment.etc.hosts.source
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config.environment.etc."nsswitch.conf".source
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config.environment.etc."nscd.conf".source
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] ++ optionals config.users.mysql.enable [
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config.environment.etc."libnss-mysql.cfg".source
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config.environment.etc."libnss-mysql-root.cfg".source
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];
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# In some configurations, nscd needs to be started as root; it will
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# drop privileges after all the NSS modules have read their
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# configuration files. So prefix the ExecStart command with "!" to
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# prevent systemd from dropping privileges early. See ExecStart in
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# systemd.service(5). We use a static user, because some NSS modules
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# sill want to read their configuration files after the privilege drop
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# and so users can set the owner of those files to the nscd user.
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serviceConfig =
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{ ExecStart = "!@${cfg.package}/bin/nscd nscd";
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Type = "forking";
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User = cfg.user;
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Group = cfg.group;
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RemoveIPC = true;
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PrivateTmp = true;
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NoNewPrivileges = true;
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RestrictSUIDSGID = true;
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ProtectSystem = "strict";
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ProtectHome = "read-only";
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RuntimeDirectory = "nscd";
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PIDFile = "/run/nscd/nscd.pid";
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Restart = "always";
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ExecReload =
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[ "${cfg.package}/bin/nscd --invalidate passwd"
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"${cfg.package}/bin/nscd --invalidate group"
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"${cfg.package}/bin/nscd --invalidate hosts"
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];
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};
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};
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};
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}
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