340 lines
9.2 KiB
Nix
340 lines
9.2 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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inherit (pkgs) cups cups_filters;
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cfg = config.services.printing;
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additionalBackends = pkgs.runCommand "additional-cups-backends" { }
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''
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mkdir -p $out
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if [ ! -e ${cups}/lib/cups/backend/smb ]; then
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mkdir -p $out/lib/cups/backend
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ln -sv ${pkgs.samba}/bin/smbspool $out/lib/cups/backend/smb
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fi
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# Provide support for printing via HTTPS.
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if [ ! -e ${cups}/lib/cups/backend/https ]; then
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mkdir -p $out/lib/cups/backend
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ln -sv ${cups}/lib/cups/backend/ipp $out/lib/cups/backend/https
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fi
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'';
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# Here we can enable additional backends, filters, etc. that are not
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# part of CUPS itself, e.g. the SMB backend is part of Samba. Since
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# we can't update ${cups}/lib/cups itself, we create a symlink tree
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# here and add the additional programs. The ServerBin directive in
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# cupsd.conf tells cupsd to use this tree.
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bindir = pkgs.buildEnv {
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name = "cups-progs";
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paths = cfg.drivers;
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pathsToLink = [ "/lib/cups" "/share/cups" "/bin" "/etc/cups" ];
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postBuild = cfg.bindirCmds;
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ignoreCollisions = true;
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};
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in
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{
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###### interface
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options = {
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services.printing = {
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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 printing support through the CUPS daemon.
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'';
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};
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listenAddresses = mkOption {
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type = types.listOf types.str;
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default = [ "127.0.0.1:631" ];
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example = [ "*:631" ];
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description = ''
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A list of addresses and ports on which to listen.
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'';
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};
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bindirCmds = mkOption {
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type = types.lines;
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internal = true;
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default = "";
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description = ''
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Additional commands executed while creating the directory
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containing the CUPS server binaries.
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'';
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};
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defaultShared = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Specifies whether local printers are shared by default.
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'';
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};
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browsing = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Specifies whether shared printers are advertised.
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'';
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};
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webInterface = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Specifies whether the web interface is enabled.
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'';
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};
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cupsdConf = mkOption {
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type = types.lines;
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default = "";
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example =
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''
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BrowsePoll cups.example.com
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LogLevel debug
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'';
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description = ''
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The contents of the configuration file of the CUPS daemon
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(<filename>cupsd.conf</filename>).
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'';
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};
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cupsFilesConf = mkOption {
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type = types.lines;
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default = "";
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description = ''
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The contents of the configuration file of the CUPS daemon
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(<filename>cups-files.conf</filename>).
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'';
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};
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extraConf = mkOption {
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type = types.lines;
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default = "";
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example =
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''
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BrowsePoll cups.example.com
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LogLevel debug
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'';
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description = ''
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Extra contents of the configuration file of the CUPS daemon
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(<filename>cupsd.conf</filename>).
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'';
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};
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clientConf = mkOption {
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type = types.lines;
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default = "";
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example =
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''
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ServerName server.example.com
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Encryption Never
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'';
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description = ''
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The contents of the client configuration.
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(<filename>client.conf</filename>)
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'';
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};
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browsedConf = mkOption {
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type = types.lines;
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default = "";
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example =
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''
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BrowsePoll cups.example.com
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'';
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description = ''
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The contents of the configuration. file of the CUPS Browsed daemon
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(<filename>cups-browsed.conf</filename>)
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'';
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};
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drivers = mkOption {
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type = types.listOf types.path;
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example = literalExample "[ pkgs.splix ]";
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description = ''
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CUPS drivers to use. Drivers provided by CUPS, cups-filters, Ghostscript
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and Samba are added unconditionally.
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'';
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};
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tempDir = mkOption {
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type = types.path;
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default = "/tmp";
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example = "/tmp/cups";
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description = ''
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CUPSd temporary directory.
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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.printing.enable {
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users.extraUsers = singleton
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{ name = "cups";
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uid = config.ids.uids.cups;
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group = "lp";
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description = "CUPS printing services";
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};
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environment.systemPackages = [ cups ];
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environment.etc."cups/client.conf".text = cfg.clientConf;
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environment.etc."cups/cups-files.conf".text = cfg.cupsFilesConf;
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environment.etc."cups/cupsd.conf".text = cfg.cupsdConf;
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environment.etc."cups/cups-browsed.conf".text = cfg.browsedConf;
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services.dbus.packages = [ cups ];
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# Cups uses libusb to talk to printers, and does not use the
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# linux kernel driver. If the driver is not in a black list, it
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# gets loaded, and then cups cannot access the printers.
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boot.blacklistedKernelModules = [ "usblp" ];
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systemd.packages = [ cups ];
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systemd.services.cups =
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{ wantedBy = [ "multi-user.target" ];
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wants = [ "network.target" ];
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after = [ "network.target" ];
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path = [ cups ];
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preStart =
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''
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mkdir -m 0755 -p /etc/cups
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mkdir -m 0700 -p /var/cache/cups
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mkdir -m 0700 -p /var/spool/cups
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mkdir -m 0755 -p ${cfg.tempDir}
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'';
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restartTriggers =
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[ config.environment.etc."cups/cups-files.conf".source
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config.environment.etc."cups/cupsd.conf".source
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];
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};
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systemd.services.cups-browsed =
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{ description = "Make remote CUPS printers available locally";
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wantedBy = [ "multi-user.target" ];
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wants = [ "cups.service" "avahi-daemon.service" ];
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after = [ "cups.service" "avahi-daemon.service" ];
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path = [ cups ];
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serviceConfig.ExecStart = "${cups_filters}/bin/cups-browsed";
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restartTriggers =
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[ config.environment.etc."cups/cups-browsed.conf".source
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];
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};
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services.printing.drivers =
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[ cups pkgs.ghostscript pkgs.cups_filters additionalBackends
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pkgs.perl pkgs.coreutils pkgs.gnused pkgs.bc pkgs.gawk pkgs.gnugrep
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];
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services.printing.cupsFilesConf =
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''
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SystemGroup root wheel
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ServerBin ${bindir}/lib/cups
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DataDir ${bindir}/share/cups
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AccessLog syslog
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ErrorLog syslog
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PageLog syslog
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TempDir ${cfg.tempDir}
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# User and group used to run external programs, including
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# those that actually send the job to the printer. Note that
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# Udev sets the group of printer devices to `lp', so we want
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# these programs to run as `lp' as well.
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User cups
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Group lp
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'';
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services.printing.cupsdConf =
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''
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LogLevel info
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${concatMapStrings (addr: ''
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Listen ${addr}
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'') cfg.listenAddresses}
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Listen /var/run/cups/cups.sock
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SetEnv PATH ${bindir}/lib/cups/filter:${bindir}/bin:${bindir}/sbin
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DefaultShared ${if cfg.defaultShared then "Yes" else "No"}
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Browsing ${if cfg.browsing then "Yes" else "No"}
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WebInterface ${if cfg.webInterface then "Yes" else "No"}
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DefaultAuthType Basic
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<Location />
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Order allow,deny
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Allow localhost
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</Location>
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<Location /admin>
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Order allow,deny
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Allow localhost
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</Location>
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<Location /admin/conf>
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AuthType Basic
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Require user @SYSTEM
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Order allow,deny
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Allow localhost
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</Location>
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<Policy default>
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<Limit Send-Document Send-URI Hold-Job Release-Job Restart-Job Purge-Jobs Set-Job-Attributes Create-Job-Subscription Renew-Subscription Cancel-Subscription Get-Notifications Reprocess-Job Cancel-Current-Job Suspend-Current-Job Resume-Job CUPS-Move-Job>
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Require user @OWNER @SYSTEM
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Order deny,allow
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</Limit>
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<Limit Pause-Printer Resume-Printer Set-Printer-Attributes Enable-Printer Disable-Printer Pause-Printer-After-Current-Job Hold-New-Jobs Release-Held-New-Jobs Deactivate-Printer Activate-Printer Restart-Printer Shutdown-Printer Startup-Printer Promote-Job Schedule-Job-After CUPS-Add-Printer CUPS-Delete-Printer CUPS-Add-Class CUPS-Delete-Class CUPS-Accept-Jobs CUPS-Reject-Jobs CUPS-Set-Default>
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AuthType Basic
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Require user @SYSTEM
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Order deny,allow
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</Limit>
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<Limit Cancel-Job CUPS-Authenticate-Job>
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Require user @OWNER @SYSTEM
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Order deny,allow
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</Limit>
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<Limit All>
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Order deny,allow
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</Limit>
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</Policy>
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${cfg.extraConf}
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'';
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security.pam.services.cups = {};
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};
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}
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