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542 lines
19 KiB
Nix
542 lines
19 KiB
Nix
{ config, lib, options, pkgs, utils, ... }:
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with lib;
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let
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package = if cfg.allowAuxiliaryImperativeNetworks
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then pkgs.wpa_supplicant_ro_ssids
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else pkgs.wpa_supplicant;
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cfg = config.networking.wireless;
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opt = options.networking.wireless;
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wpa3Protocols = [ "SAE" "FT-SAE" ];
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hasMixedWPA = opts:
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let
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hasWPA3 = !mutuallyExclusive opts.authProtocols wpa3Protocols;
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others = subtractLists wpa3Protocols opts.authProtocols;
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in hasWPA3 && others != [];
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# Gives a WPA3 network higher priority
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increaseWPA3Priority = opts:
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opts // optionalAttrs (hasMixedWPA opts)
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{ priority = if opts.priority == null
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then 1
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else opts.priority + 1;
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};
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# Creates a WPA2 fallback network
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mkWPA2Fallback = opts:
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opts // { authProtocols = subtractLists wpa3Protocols opts.authProtocols; };
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# Networks attrset as a list
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networkList = mapAttrsToList (ssid: opts: opts // { inherit ssid; })
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cfg.networks;
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# List of all networks (normal + generated fallbacks)
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allNetworks =
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if cfg.fallbackToWPA2
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then map increaseWPA3Priority networkList
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++ map mkWPA2Fallback (filter hasMixedWPA networkList)
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else networkList;
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# Content of wpa_supplicant.conf
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generatedConfig = concatStringsSep "\n" (
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(map mkNetwork allNetworks)
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++ optional cfg.userControlled.enable (concatStringsSep "\n"
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[ "ctrl_interface=/run/wpa_supplicant"
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"ctrl_interface_group=${cfg.userControlled.group}"
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"update_config=1"
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])
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++ [ "pmf=1" ]
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++ optional cfg.scanOnLowSignal ''bgscan="simple:30:-70:3600"''
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++ optional (cfg.extraConfig != "") cfg.extraConfig);
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configIsGenerated = with cfg;
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networks != {} || extraConfig != "" || userControlled.enable;
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# the original configuration file
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configFile =
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if configIsGenerated
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then pkgs.writeText "wpa_supplicant.conf" generatedConfig
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else "/etc/wpa_supplicant.conf";
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# the config file with environment variables replaced
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finalConfig = ''"$RUNTIME_DIRECTORY"/wpa_supplicant.conf'';
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# Creates a network block for wpa_supplicant.conf
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mkNetwork = opts:
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let
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quote = x: ''"${x}"'';
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indent = x: " " + x;
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pskString = if opts.psk != null
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then quote opts.psk
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else opts.pskRaw;
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options = [
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"ssid=${quote opts.ssid}"
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(if pskString != null || opts.auth != null
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then "key_mgmt=${concatStringsSep " " opts.authProtocols}"
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else "key_mgmt=NONE")
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] ++ optional opts.hidden "scan_ssid=1"
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++ optional (pskString != null) "psk=${pskString}"
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++ optionals (opts.auth != null) (filter (x: x != "") (splitString "\n" opts.auth))
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++ optional (opts.priority != null) "priority=${toString opts.priority}"
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++ optional (opts.extraConfig != "") opts.extraConfig;
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in ''
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network={
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${concatMapStringsSep "\n" indent options}
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}
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'';
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# Creates a systemd unit for wpa_supplicant bound to a given (or any) interface
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mkUnit = iface:
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let
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deviceUnit = optional (iface != null) "sys-subsystem-net-devices-${utils.escapeSystemdPath iface}.device";
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configStr = if cfg.allowAuxiliaryImperativeNetworks
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then "-c /etc/wpa_supplicant.conf -I ${finalConfig}"
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else "-c ${finalConfig}";
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in {
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description = "WPA Supplicant instance" + optionalString (iface != null) " for interface ${iface}";
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after = deviceUnit;
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before = [ "network.target" ];
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wants = [ "network.target" ];
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requires = deviceUnit;
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wantedBy = [ "multi-user.target" ];
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stopIfChanged = false;
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path = [ package ];
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serviceConfig.RuntimeDirectory = "wpa_supplicant";
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serviceConfig.RuntimeDirectoryMode = "700";
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serviceConfig.EnvironmentFile = mkIf (cfg.environmentFile != null)
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(builtins.toString cfg.environmentFile);
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script =
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''
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${optionalString (configIsGenerated && !cfg.allowAuxiliaryImperativeNetworks) ''
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if [ -f /etc/wpa_supplicant.conf ]; then
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echo >&2 "<3>/etc/wpa_supplicant.conf present but ignored. Generated ${configFile} is used instead."
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fi
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''}
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# substitute environment variables
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${pkgs.gawk}/bin/awk '{
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for(varname in ENVIRON)
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gsub("@"varname"@", ENVIRON[varname])
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print
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}' "${configFile}" > "${finalConfig}"
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iface_args="-s ${optionalString cfg.dbusControlled "-u"} -D${cfg.driver} ${configStr}"
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${if iface == null then ''
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# detect interfaces automatically
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# check if there are no wireless interfaces
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if ! find -H /sys/class/net/* -name wireless | grep -q .; then
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# if so, wait until one appears
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echo "Waiting for wireless interfaces"
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grep -q '^ACTION=add' < <(stdbuf -oL -- udevadm monitor -s net/wlan -pu)
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# Note: the above line has been carefully written:
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# 1. The process substitution avoids udevadm hanging (after grep has quit)
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# until it tries to write to the pipe again. Not even pipefail works here.
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# 2. stdbuf is needed because udevadm output is buffered by default and grep
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# may hang until more udev events enter the pipe.
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fi
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# add any interface found to the daemon arguments
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for name in $(find -H /sys/class/net/* -name wireless | cut -d/ -f 5); do
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echo "Adding interface $name"
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args+="''${args:+ -N} -i$name $iface_args"
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done
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'' else ''
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# add known interface to the daemon arguments
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args="-i${iface} $iface_args"
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''}
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# finally start daemon
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exec wpa_supplicant $args
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'';
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};
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systemctl = "/run/current-system/systemd/bin/systemctl";
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in {
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options = {
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networking.wireless = {
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enable = mkEnableOption "wpa_supplicant";
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interfaces = mkOption {
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type = types.listOf types.str;
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default = [];
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example = [ "wlan0" "wlan1" ];
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description = ''
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The interfaces <command>wpa_supplicant</command> will use. If empty, it will
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automatically use all wireless interfaces.
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<note><para>
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A separate wpa_supplicant instance will be started for each interface.
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</para></note>
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'';
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};
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driver = mkOption {
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type = types.str;
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default = "nl80211,wext";
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description = lib.mdDoc "Force a specific wpa_supplicant driver.";
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};
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allowAuxiliaryImperativeNetworks = mkEnableOption "support for imperative & declarative networks" // {
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description = ''
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Whether to allow configuring networks "imperatively" (e.g. via
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<package>wpa_supplicant_gui</package>) and declaratively via
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<xref linkend="opt-networking.wireless.networks"/>.
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Please note that this adds a custom patch to <package>wpa_supplicant</package>.
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'';
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};
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scanOnLowSignal = mkOption {
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type = types.bool;
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default = true;
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description = lib.mdDoc ''
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Whether to periodically scan for (better) networks when the signal of
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the current one is low. This will make roaming between access points
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faster, but will consume more power.
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'';
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};
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fallbackToWPA2 = mkOption {
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type = types.bool;
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default = true;
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description = lib.mdDoc ''
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Whether to fall back to WPA2 authentication protocols if WPA3 failed.
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This allows old wireless cards (that lack recent features required by
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WPA3) to connect to mixed WPA2/WPA3 access points.
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To avoid possible downgrade attacks, disable this options.
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'';
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};
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environmentFile = mkOption {
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type = types.nullOr types.path;
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default = null;
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example = "/run/secrets/wireless.env";
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description = ''
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File consisting of lines of the form <literal>varname=value</literal>
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to define variables for the wireless configuration.
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See section "EnvironmentFile=" in <citerefentry>
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<refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum>
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</citerefentry> for a syntax reference.
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Secrets (PSKs, passwords, etc.) can be provided without adding them to
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the world-readable Nix store by defining them in the environment file and
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referring to them in option <option>networking.wireless.networks</option>
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with the syntax <literal>@varname@</literal>. Example:
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<programlisting>
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# content of /run/secrets/wireless.env
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PSK_HOME=mypassword
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PASS_WORK=myworkpassword
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</programlisting>
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<programlisting>
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# wireless-related configuration
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networking.wireless.environmentFile = "/run/secrets/wireless.env";
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networking.wireless.networks = {
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home.psk = "@PSK_HOME@";
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work.auth = '''
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eap=PEAP
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identity="my-user@example.com"
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password="@PASS_WORK@"
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''';
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};
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</programlisting>
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'';
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};
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networks = mkOption {
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type = types.attrsOf (types.submodule {
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options = {
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psk = mkOption {
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type = types.nullOr types.str;
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default = null;
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description = ''
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The network's pre-shared key in plaintext defaulting
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to being a network without any authentication.
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<warning><para>
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Be aware that this will be written to the nix store
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in plaintext! Use an environment variable instead.
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</para></warning>
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<note><para>
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Mutually exclusive with <varname>pskRaw</varname>.
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</para></note>
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'';
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};
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pskRaw = mkOption {
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type = types.nullOr types.str;
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default = null;
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description = ''
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The network's pre-shared key in hex defaulting
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to being a network without any authentication.
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<warning><para>
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Be aware that this will be written to the nix store
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in plaintext! Use an environment variable instead.
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</para></warning>
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<note><para>
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Mutually exclusive with <varname>psk</varname>.
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</para></note>
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'';
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};
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authProtocols = mkOption {
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default = [
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# WPA2 and WPA3
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"WPA-PSK" "WPA-EAP" "SAE"
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# 802.11r variants of the above
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"FT-PSK" "FT-EAP" "FT-SAE"
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];
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# The list can be obtained by running this command
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# awk '
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# /^# key_mgmt: /{ run=1 }
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# /^#$/{ run=0 }
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# /^# [A-Z0-9-]{2,}/{ if(run){printf("\"%s\"\n", $2)} }
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# ' /run/current-system/sw/share/doc/wpa_supplicant/wpa_supplicant.conf.example
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type = types.listOf (types.enum [
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"WPA-PSK"
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"WPA-EAP"
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"IEEE8021X"
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"NONE"
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"WPA-NONE"
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"FT-PSK"
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"FT-EAP"
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"FT-EAP-SHA384"
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"WPA-PSK-SHA256"
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"WPA-EAP-SHA256"
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"SAE"
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"FT-SAE"
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"WPA-EAP-SUITE-B"
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"WPA-EAP-SUITE-B-192"
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"OSEN"
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"FILS-SHA256"
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"FILS-SHA384"
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"FT-FILS-SHA256"
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"FT-FILS-SHA384"
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"OWE"
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"DPP"
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]);
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description = lib.mdDoc ''
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The list of authentication protocols accepted by this network.
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This corresponds to the `key_mgmt` option in wpa_supplicant.
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'';
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};
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auth = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = ''
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eap=PEAP
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identity="user@example.com"
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password="@EXAMPLE_PASSWORD@"
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'';
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description = ''
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Use this option to configure advanced authentication methods like EAP.
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See
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<citerefentry>
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<refentrytitle>wpa_supplicant.conf</refentrytitle>
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<manvolnum>5</manvolnum>
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</citerefentry>
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for example configurations.
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<warning><para>
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Be aware that this will be written to the nix store
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in plaintext! Use an environment variable for secrets.
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</para></warning>
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<note><para>
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Mutually exclusive with <varname>psk</varname> and
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<varname>pskRaw</varname>.
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</para></note>
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'';
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};
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hidden = mkOption {
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type = types.bool;
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default = false;
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description = lib.mdDoc ''
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Set this to `true` if the SSID of the network is hidden.
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'';
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example = literalExpression ''
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{ echelon = {
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hidden = true;
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psk = "abcdefgh";
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};
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}
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'';
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};
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priority = mkOption {
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type = types.nullOr types.int;
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default = null;
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description = lib.mdDoc ''
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By default, all networks will get same priority group (0). If some of the
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networks are more desirable, this field can be used to change the order in
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which wpa_supplicant goes through the networks when selecting a BSS. The
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priority groups will be iterated in decreasing priority (i.e., the larger the
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priority value, the sooner the network is matched against the scan results).
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Within each priority group, networks will be selected based on security
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policy, signal strength, etc.
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'';
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};
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extraConfig = mkOption {
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type = types.str;
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default = "";
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example = ''
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bssid_blacklist=02:11:22:33:44:55 02:22:aa:44:55:66
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'';
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description = ''
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Extra configuration lines appended to the network block.
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See
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<citerefentry>
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<refentrytitle>wpa_supplicant.conf</refentrytitle>
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<manvolnum>5</manvolnum>
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</citerefentry>
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for available options.
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'';
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};
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};
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});
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description = lib.mdDoc ''
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The network definitions to automatically connect to when
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{command}`wpa_supplicant` is running. If this
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parameter is left empty wpa_supplicant will use
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/etc/wpa_supplicant.conf as the configuration file.
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'';
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default = {};
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example = literalExpression ''
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{ echelon = { # SSID with no spaces or special characters
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psk = "abcdefgh"; # (password will be written to /nix/store!)
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};
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echelon = { # safe version of the above: read PSK from the
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psk = "@PSK_ECHELON@"; # variable PSK_ECHELON, defined in environmentFile,
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}; # this won't leak into /nix/store
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"echelon's AP" = { # SSID with spaces and/or special characters
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psk = "ijklmnop"; # (password will be written to /nix/store!)
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};
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"free.wifi" = {}; # Public wireless network
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}
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'';
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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 = lib.mdDoc ''
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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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When using a declarative network specification you cannot persist any
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settings via wpa_gui or wpa_cli.
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'';
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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 = lib.mdDoc "Members of this group can control wpa_supplicant.";
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};
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};
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dbusControlled = mkOption {
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type = types.bool;
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default = lib.length cfg.interfaces < 2;
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defaultText = literalExpression "length config.${opt.interfaces} < 2";
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description = lib.mdDoc ''
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Whether to enable the DBus control interface.
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This is only needed when using NetworkManager or connman.
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'';
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};
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extraConfig = mkOption {
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type = types.str;
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default = "";
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example = ''
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p2p_disabled=1
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'';
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description = ''
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Extra lines appended to the configuration file.
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See
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<citerefentry>
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<refentrytitle>wpa_supplicant.conf</refentrytitle>
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<manvolnum>5</manvolnum>
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</citerefentry>
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for available options.
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'';
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};
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};
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};
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config = mkIf cfg.enable {
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assertions = flip mapAttrsToList cfg.networks (name: cfg: {
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assertion = with cfg; count (x: x != null) [ psk pskRaw auth ] <= 1;
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message = ''options networking.wireless."${name}".{psk,pskRaw,auth} are mutually exclusive'';
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}) ++ [
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{
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assertion = length cfg.interfaces > 1 -> !cfg.dbusControlled;
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message =
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let daemon = if config.networking.networkmanager.enable then "NetworkManager" else
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if config.services.connman.enable then "connman" else null;
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n = toString (length cfg.interfaces);
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in ''
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It's not possible to run multiple wpa_supplicant instances with DBus support.
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Note: you're seeing this error because `networking.wireless.interfaces` has
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${n} entries, implying an equal number of wpa_supplicant instances.
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'' + optionalString (daemon != null) ''
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You don't need to change `networking.wireless.interfaces` when using ${daemon}:
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in this case the interfaces will be configured automatically for you.
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'';
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}
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];
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hardware.wirelessRegulatoryDatabase = true;
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environment.systemPackages = [ package ];
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services.dbus.packages = optional cfg.dbusControlled package;
|
|
|
|
systemd.services =
|
|
if cfg.interfaces == []
|
|
then { wpa_supplicant = mkUnit null; }
|
|
else listToAttrs (map (i: nameValuePair "wpa_supplicant-${i}" (mkUnit i)) cfg.interfaces);
|
|
|
|
# Restart wpa_supplicant after resuming from sleep
|
|
powerManagement.resumeCommands = concatStringsSep "\n" (
|
|
optional (cfg.interfaces == []) "${systemctl} try-restart wpa_supplicant"
|
|
++ map (i: "${systemctl} try-restart wpa_supplicant-${i}") cfg.interfaces
|
|
);
|
|
|
|
# Restart wpa_supplicant when a wlan device appears or disappears. This is
|
|
# only needed when an interface hasn't been specified by the user.
|
|
services.udev.extraRules = optionalString (cfg.interfaces == []) ''
|
|
ACTION=="add|remove", SUBSYSTEM=="net", ENV{DEVTYPE}=="wlan", \
|
|
RUN+="${systemctl} try-restart wpa_supplicant.service"
|
|
'';
|
|
};
|
|
|
|
meta.maintainers = with lib.maintainers; [ globin rnhmjoj ];
|
|
}
|