497108b456
"batch" is a shell script so invoking it via setuid wrapper never worked anyway. (The kernel drops perms on executables with shebang.) A previous nixpkgs commit made "batch" invoke the NixOS setuid "at" wrapper to gain needed privileges. Thanks to @yesbox for noticing.
115 lines
2.7 KiB
Nix
115 lines
2.7 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.atd;
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inherit (pkgs) at;
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in
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{
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###### interface
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options = {
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services.atd.enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to enable the <command>at</command> daemon, a command scheduler.
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'';
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};
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services.atd.allowEveryone = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to make <filename>/var/spool/at{jobs,spool}</filename>
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writeable by everyone (and sticky). This is normally not
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needed since the <command>at</command> commands are
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setuid/setgid <literal>atd</literal>.
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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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# Not wrapping "batch" because it's a shell script (kernel drops perms
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# anyway) and it's patched to invoke the "at" setuid wrapper.
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security.wrappers = builtins.listToAttrs (
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map (program: { name = "${program}"; value = {
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source = "${at}/bin/${program}";
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owner = "atd";
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group = "atd";
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setuid = true;
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setgid = true;
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};}) [ "at" "atq" "atrm" ]);
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environment.systemPackages = [ at ];
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security.pam.services.atd = {};
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users.extraUsers = singleton
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{ name = "atd";
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uid = config.ids.uids.atd;
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description = "atd user";
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home = "/var/empty";
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};
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users.extraGroups = singleton
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{ name = "atd";
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gid = config.ids.gids.atd;
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};
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systemd.services.atd = {
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description = "Job Execution Daemon (atd)";
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after = [ "systemd-udev-settle.service" ];
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wants = [ "systemd-udev-settle.service" ];
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wantedBy = [ "multi-user.target" ];
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path = [ at ];
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preStart = ''
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# Snippets taken and adapted from the original `install' rule of
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# the makefile.
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# We assume these values are those actually used in Nixpkgs for
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# `at'.
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spooldir=/var/spool/atspool
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jobdir=/var/spool/atjobs
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etcdir=/etc/at
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for dir in "$spooldir" "$jobdir" "$etcdir"; do
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if [ ! -d "$dir" ]; then
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mkdir -p "$dir"
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chown atd:atd "$dir"
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fi
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done
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chmod 1770 "$spooldir" "$jobdir"
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${if cfg.allowEveryone then ''chmod a+rwxt "$spooldir" "$jobdir" '' else ""}
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if [ ! -f "$etcdir"/at.deny ]; then
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touch "$etcdir"/at.deny
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chown root:atd "$etcdir"/at.deny
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chmod 640 "$etcdir"/at.deny
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fi
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if [ ! -f "$jobdir"/.SEQ ]; then
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touch "$jobdir"/.SEQ
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chown atd:atd "$jobdir"/.SEQ
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chmod 600 "$jobdir"/.SEQ
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fi
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'';
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script = "atd";
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serviceConfig.Type = "forking";
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};
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};
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}
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