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156 lines
3.8 KiB
156 lines
3.8 KiB
# This module defines global configuration for Haka.
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{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.haka;
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haka = cfg.package;
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hakaConf = pkgs.writeText "haka.conf"
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''
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[general]
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configuration = ${if lib.strings.hasPrefix "/" cfg.configFile
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then "${cfg.configFile}"
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else "${haka}/share/haka/sample/${cfg.configFile}"}
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${optionalString (builtins.lessThan 0 cfg.threads) "thread = ${cfg.threads}"}
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[packet]
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${optionalString cfg.pcap ''module = "packet/pcap"''}
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${optionalString cfg.nfqueue ''module = "packet/nqueue"''}
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${optionalString cfg.dump.enable ''dump = "yes"''}
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${optionalString cfg.dump.enable ''dump_input = "${cfg.dump.input}"''}
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${optionalString cfg.dump.enable ''dump_output = "${cfg.dump.output}"''}
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interfaces = "${lib.strings.concatStringsSep "," cfg.interfaces}"
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[log]
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# Select the log module
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module = "log/syslog"
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# Set the default logging level
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#level = "info,packet=debug"
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[alert]
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# Select the alert module
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module = "alert/syslog"
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# Disable alert on standard output
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#alert_on_stdout = no
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# alert/file module option
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#file = "/dev/null"
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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.haka = {
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enable = mkEnableOption "Haka";
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package = mkOption {
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default = pkgs.haka;
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defaultText = literalExpression "pkgs.haka";
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type = types.package;
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description = "
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Which Haka derivation to use.
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";
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};
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configFile = mkOption {
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default = "empty.lua";
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example = "/srv/haka/myfilter.lua";
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type = types.str;
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description = ''
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Specify which configuration file Haka uses.
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It can be absolute path or a path relative to the sample directory of
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the haka git repo.
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'';
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};
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interfaces = mkOption {
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default = [ "eth0" ];
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example = [ "any" ];
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type = with types; listOf str;
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description = ''
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Specify which interface(s) Haka listens to.
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Use 'any' to listen to all interfaces.
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'';
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};
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threads = mkOption {
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default = 0;
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example = 4;
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type = types.int;
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description = ''
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The number of threads that will be used.
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All system threads are used by default.
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'';
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};
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pcap = mkOption {
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default = true;
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type = types.bool;
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description = "Whether to enable pcap";
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};
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nfqueue = mkEnableOption "nfqueue";
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dump.enable = mkEnableOption "dump";
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dump.input = mkOption {
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default = "/tmp/input.pcap";
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example = "/path/to/file.pcap";
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type = types.path;
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description = "Path to file where incoming packets are dumped";
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};
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dump.output = mkOption {
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default = "/tmp/output.pcap";
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example = "/path/to/file.pcap";
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type = types.path;
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description = "Path to file where outgoing packets are dumped";
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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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assertions = [
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{ assertion = cfg.pcap != cfg.nfqueue;
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message = "either pcap or nfqueue can be enabled, not both.";
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}
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{ assertion = cfg.nfqueue -> !dump.enable;
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message = "dump can only be used with nfqueue.";
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}
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{ assertion = cfg.interfaces != [];
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message = "at least one interface must be specified.";
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}];
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environment.systemPackages = [ haka ];
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systemd.services.haka = {
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description = "Haka";
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wantedBy = [ "multi-user.target" ];
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after = [ "network.target" ];
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serviceConfig = {
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ExecStart = "${haka}/bin/haka -c ${hakaConf}";
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ExecStop = "${haka}/bin/hakactl stop";
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User = "root";
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Type = "forking";
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};
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};
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};
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}
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