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{ config, lib, pkgs, ... }: {
options = {
services.ipp-usb = {
enable = lib.mkEnableOption (lib.mdDoc "ipp-usb, a daemon to turn an USB printer/scanner supporting IPP everywhere (aka AirPrint, WSD, AirScan) into a locally accessible network printer/scanner");
};
};
config = lib.mkIf config.services.ipp-usb.enable {
systemd.services.ipp-usb = {
description = "Daemon for IPP over USB printer support";
after = [ "cups.service" "avahi-daemon.service" ];
wants = [ "avahi-daemon.service" ];
serviceConfig = {
ExecStart = [ "${pkgs.ipp-usb}/bin/ipp-usb" ];
Type = "simple";
Restart = "on-failure";
StateDirectory = "ipp-usb";
LogsDirectory = "ipp-usb";
# hardening.
ProtectHome = true;
PrivateTmp = true;
PrivateUsers = true;
ProtectControlGroups = true;
MemoryDenyWriteExecute = true;
# breaks the daemon, presumably because it messes with DeviceAllow
ProtectClock = false;
ProtectKernelTunables = true;
ProtectKernelLogs = true;
ProtectSystem = "strict";
RestrictRealtime = true;
RestrictSUIDSGID = true;
SystemCallArchitectures = "native";
PrivateMounts = true;
ProtectHostname = true;
ProtectKernelModules = true;
RemoveIPC = true;
RestrictNamespaces = true;
AmbientCapabilities = "";
CapabilityBoundingSet = "";
NoNewPrivileges = true;
RestrictAddressFamilies = [ "AF_UNIX" "AF_NETLINK" "AF_INET" "AF_INET6" ];
ProtectProc = "noaccess";
};
};
# starts the systemd service
services.udev.packages = [ pkgs.ipp-usb ];
services.avahi = {
enable = true;
publish = {
enable = true;
userServices = true;
};
};
# enable printing and scanning by default, but not required.
services.printing.enable = lib.mkDefault true;
hardware.sane.enable = lib.mkDefault true;
# so that sane discovers scanners
hardware.sane.extraBackends = [ pkgs.sane-airscan ];
};
}
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