9e7fe29e41
Workaround for CVE-2013-5211: http://support.ntp.org/bin/view/Main/SecurityNotice#DRDoS_Amplification_Attack_using
93 lines
1.8 KiB
Nix
93 lines
1.8 KiB
Nix
{ config, pkgs, ... }:
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with pkgs.lib;
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let
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inherit (pkgs) ntp;
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stateDir = "/var/lib/ntp";
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ntpUser = "ntp";
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configFile = pkgs.writeText "ntp.conf" ''
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# Keep the drift file in ${stateDir}/ntp.drift. However, since we
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# chroot to ${stateDir}, we have to specify it as /ntp.drift.
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driftfile /ntp.drift
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restrict default kod nomodify notrap nopeer noquery
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restrict -6 default kod nomodify notrap nopeer noquery
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${toString (map (server: "server " + server + " iburst\n") config.services.ntp.servers)}
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'';
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ntpFlags = "-c ${configFile} -u ${ntpUser}:nogroup -i ${stateDir}";
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in
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{
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###### interface
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options = {
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services.ntp = {
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enable = mkOption {
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default = true;
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description = ''
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Whether to synchronise your machine's time using the NTP
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protocol.
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'';
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};
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servers = mkOption {
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default = [
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"0.pool.ntp.org"
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"1.pool.ntp.org"
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"2.pool.ntp.org"
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];
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description = ''
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The set of NTP servers from which to synchronise.
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'';
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};
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};
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};
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###### implementation
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config = mkIf config.services.ntp.enable {
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# Make tools such as ntpq available in the system path
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environment.systemPackages = [ pkgs.ntp ];
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users.extraUsers = singleton
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{ name = ntpUser;
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uid = config.ids.uids.ntp;
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description = "NTP daemon user";
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home = stateDir;
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};
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jobs.ntpd =
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{ description = "NTP Daemon";
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wantedBy = [ "ip-up.target" ];
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partOf = [ "ip-up.target" ];
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path = [ ntp ];
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preStart =
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''
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mkdir -m 0755 -p ${stateDir}
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chown ${ntpUser} ${stateDir}
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'';
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exec = "ntpd -g -n ${ntpFlags}";
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};
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};
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}
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