250 lines
9.2 KiB
Nix
250 lines
9.2 KiB
Nix
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{ config, lib, utils, pkgs, ... }:
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with lib;
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let
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cfg = config.networking.supplicant;
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# We must escape interfaces due to the systemd interpretation
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subsystemDevice = interface:
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"sys-subsystem-net-devices-${utils.escapeSystemdPath interface}.device";
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serviceName = iface: "supplicant-${if (iface=="WLAN") then "wlan@" else (
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if (iface=="LAN") then "lan@" else (
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if (iface=="DBUS") then "dbus"
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else (replaceChars [" "] ["-"] iface)))}";
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# TODO: Use proper privilege separation for wpa_supplicant
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supplicantService = iface: suppl:
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let
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deps = (if (iface=="WLAN"||iface=="LAN") then ["sys-subsystem-net-devices-%i.device"] else (
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if (iface=="DBUS") then ["dbus.service"]
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else (map subsystemDevice (splitString " " iface))))
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++ optional (suppl.bridge!="") (subsystemDevice suppl.bridge);
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ifaceArg = concatStringsSep " -N " (map (i: "-i${i}") (splitString " " iface));
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driverArg = optionalString (suppl.driver != null) "-D${suppl.driver}";
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bridgeArg = optionalString (suppl.bridge!="") "-b${suppl.bridge}";
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confFileArg = optionalString (suppl.configFile.path!=null) "-c${suppl.configFile.path}";
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extraConfFile = pkgs.writeText "supplicant-extra-conf-${replaceChars [" "] ["-"] iface}" ''
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${optionalString suppl.userControlled.enable "ctrl_interface=DIR=${suppl.userControlled.socketDir} GROUP=${suppl.userControlled.group}"}
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${optionalString suppl.configFile.writable "update_config=1"}
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${suppl.extraConf}
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'';
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in
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{ description = "Supplicant ${iface}${optionalString (iface=="WLAN"||iface=="LAN") " %I"}";
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wantedBy = [ "network.target" ];
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bindsTo = deps;
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after = deps;
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before = [ "network.target" ];
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# Receive restart event after resume
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partOf = [ "post-resume.target" ];
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path = [ pkgs.coreutils ];
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preStart = ''
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${optionalString (suppl.configFile.path!=null) ''
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touch -a ${suppl.configFile.path}
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chmod 600 ${suppl.configFile.path}
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''}
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${optionalString suppl.userControlled.enable ''
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if ! test -e ${suppl.userControlled.socketDir}; then
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mkdir -m 0770 -p ${suppl.userControlled.socketDir}
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chgrp ${suppl.userControlled.group} ${suppl.userControlled.socketDir}
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fi
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if test "$(stat --printf '%G' ${suppl.userControlled.socketDir})" != "${suppl.userControlled.group}"; then
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echo "ERROR: bad ownership on ${suppl.userControlled.socketDir}" >&2
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exit 1
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fi
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''}
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'';
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serviceConfig.ExecStart = "${pkgs.wpa_supplicant}/bin/wpa_supplicant -s ${driverArg} ${confFileArg} -I${extraConfFile} ${bridgeArg} ${suppl.extraCmdArgs} ${if (iface=="WLAN"||iface=="LAN") then "-i%I" else (if (iface=="DBUS") then "-u" else ifaceArg)}";
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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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networking.supplicant = mkOption {
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type = types.attrsOf types.optionSet;
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default = { };
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example = {
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"wlan0 wlan1" = {
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configFile = "/etc/wpa_supplicant";
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userControlled.group = "network";
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extraConf = ''
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ap_scan=1
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p2p_disabled=1
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'';
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extraCmdArgs = "-u -W";
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bridge = "br0";
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};
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};
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description = ''
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Interfaces for which to start <command>wpa_supplicant</command>.
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The supplicant is used to scan for and associate with wireless networks,
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or to authenticate with 802.1x capable network switches.
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The value of this option is an attribute set. Each attribute configures a
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<command>wpa_supplicant</command> service, where the attribute name specifies
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the name of the interface that <command>wpa_supplicant</command> operates on.
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The attribute name can be a space separated list of interfaces.
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The attribute names <literal>WLAN</literal>, <literal>LAN</literal> and <literal>DBUS</literal>
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have a special meaning. <literal>WLAN</literal> and <literal>LAN</literal> are
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configurations for universal <command>wpa_supplicant</command> service that is
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started for each WLAN interface or for each LAN interface, respectively.
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<literal>DBUS</literal> defines a device-unrelated <command>wpa_supplicant</command>
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service that can be accessed through <literal>D-Bus</literal>.
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'';
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options = {
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configFile = {
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path = mkOption {
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type = types.path;
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example = "/etc/wpa_supplicant.conf";
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description = ''
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External <literal>wpa_supplicant.conf</literal> configuration file.
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The configuration options defined declaratively within <literal>networking.supplicant</literal> have
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precedence over options defined in <literal>configFile</literal>.
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'';
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};
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writable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether the configuration file at <literal>configFile.path</literal> should be written to by
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<literal>wpa_supplicant</literal>.
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'';
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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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ap_scan=1
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device_name=My-NixOS-Device
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device_type=1-0050F204-1
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driver_param=use_p2p_group_interface=1
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disable_scan_offload=1
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p2p_listen_reg_class=81
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p2p_listen_channel=1
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p2p_oper_reg_class=81
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p2p_oper_channel=1
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manufacturer=NixOS
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model_name=NixOS_Unstable
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model_number=2015
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'';
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description = ''
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Configuration options for <literal>wpa_supplicant.conf</literal>.
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Options defined here have precedence over options in <literal>configFile</literal>.
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NOTE: Do not write sensitive data into <literal>extraConf</literal> as it will
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be world-readable in the <literal>nix-store</literal>. For sensitive information
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use the <literal>configFile</literal> instead.
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'';
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};
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extraCmdArgs = mkOption {
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type = types.str;
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default = "";
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example = "-e/var/run/wpa_supplicant/entropy.bin";
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description =
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"Command line arguments to add when executing <literal>wpa_supplicant</literal>.";
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};
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driver = mkOption {
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type = types.nullOr types.str;
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default = "nl80211,wext";
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description = "Force a specific wpa_supplicant driver.";
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};
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bridge = mkOption {
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type = types.str;
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default = "";
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description = "Name of the bridge interface that wpa_supplicant should listen at.";
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};
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userControlled = {
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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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Allow normal users to control wpa_supplicant through wpa_gui or wpa_cli.
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This is useful for laptop users that switch networks a lot and don't want
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to depend on a large package such as NetworkManager just to pick nearby
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access points.
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'';
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};
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socketDir = mkOption {
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type = types.str;
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default = "/var/run/wpa_supplicant";
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description = "Directory of sockets for controlling wpa_supplicant.";
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};
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group = mkOption {
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type = types.str;
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default = "wheel";
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example = "network";
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description = "Members of this group can control wpa_supplicant.";
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};
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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 (cfg != {}) {
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environment.systemPackages = [ pkgs.wpa_supplicant ];
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services.dbus.packages = [ pkgs.wpa_supplicant ];
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systemd.services = mapAttrs' (n: v: nameValuePair (serviceName n) (supplicantService n v)) cfg;
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services.udev.packages = [
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(pkgs.writeTextFile {
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name = "99-zzz-60-supplicant.rules";
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destination = "/etc/udev/rules.d/99-zzz-60-supplicant.rules";
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text = ''
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${flip (concatMapStringsSep "\n") (filter (n: n!="WLAN" && n!="LAN" && n!="DBUS") (attrNames cfg)) (iface:
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flip (concatMapStringsSep "\n") (splitString " " iface) (i: ''
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ACTION=="add", SUBSYSTEM=="net", ENV{INTERFACE}=="${i}", TAG+="systemd", ENV{SYSTEMD_WANTS}+="supplicant-${replaceChars [" "] ["-"] iface}.service", TAG+="SUPPLICANT_ASSIGNED"''))}
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${optionalString (hasAttr "WLAN" cfg) ''
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ACTION=="add", SUBSYSTEM=="net", ENV{DEVTYPE}=="wlan", TAG!="SUPPLICANT_ASSIGNED", TAG+="systemd", PROGRAM="${pkgs.systemd}/bin/systemd-escape -p %E{INTERFACE}", ENV{SYSTEMD_WANTS}+="supplicant-wlan@$result.service"
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''}
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${optionalString (hasAttr "LAN" cfg) ''
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ACTION=="add", SUBSYSTEM=="net", ENV{DEVTYPE}=="lan", TAG!="SUPPLICANT_ASSIGNED", TAG+="systemd", PROGRAM="${pkgs.systemd}/bin/systemd-escape -p %E{INTERFACE}", ENV{SYSTEMD_WANTS}+="supplicant-lan@$result.service"
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''}
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'';
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})];
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};
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}
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