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{ config, lib, options, pkgs, utils, ... }:
with lib;
let
package = if cfg.allowAuxiliaryImperativeNetworks
then pkgs.wpa_supplicant_ro_ssids
else pkgs.wpa_supplicant;
cfg = config.networking.wireless;
opt = options.networking.wireless;
wpa3Protocols = [ "SAE" "FT-SAE" ];
hasMixedWPA = opts:
let
hasWPA3 = !mutuallyExclusive opts.authProtocols wpa3Protocols;
others = subtractLists wpa3Protocols opts.authProtocols;
in hasWPA3 && others != [];
# Gives a WPA3 network higher priority
increaseWPA3Priority = opts:
opts // optionalAttrs (hasMixedWPA opts)
{ priority = if opts.priority == null
then 1
else opts.priority + 1;
};
# Creates a WPA2 fallback network
mkWPA2Fallback = opts:
opts // { authProtocols = subtractLists wpa3Protocols opts.authProtocols; };
# Networks attrset as a list
networkList = mapAttrsToList (ssid: opts: opts // { inherit ssid; })
cfg.networks;
# List of all networks (normal + generated fallbacks)
allNetworks =
if cfg.fallbackToWPA2
then map increaseWPA3Priority networkList
++ map mkWPA2Fallback (filter hasMixedWPA networkList)
else networkList;
# Content of wpa_supplicant.conf
generatedConfig = concatStringsSep "\n" (
(map mkNetwork allNetworks)
++ optional cfg.userControlled.enable (concatStringsSep "\n"
[ "ctrl_interface=/run/wpa_supplicant"
"ctrl_interface_group=${cfg.userControlled.group}"
"update_config=1"
])
++ [ "pmf=1" ]
++ optional cfg.scanOnLowSignal ''bgscan="simple:30:-70:3600"''
++ optional (cfg.extraConfig != "") cfg.extraConfig);
configIsGenerated = with cfg;
networks != {} || extraConfig != "" || userControlled.enable;
# the original configuration file
configFile =
if configIsGenerated
then pkgs.writeText "wpa_supplicant.conf" generatedConfig
else "/etc/wpa_supplicant.conf";
# the config file with environment variables replaced
finalConfig = ''"$RUNTIME_DIRECTORY"/wpa_supplicant.conf'';
# Creates a network block for wpa_supplicant.conf
mkNetwork = opts:
let
quote = x: ''"${x}"'';
indent = x: " " + x;
pskString = if opts.psk != null
then quote opts.psk
else opts.pskRaw;
options = [
"ssid=${quote opts.ssid}"
(if pskString != null || opts.auth != null
then "key_mgmt=${concatStringsSep " " opts.authProtocols}"
else "key_mgmt=NONE")
] ++ optional opts.hidden "scan_ssid=1"
++ optional (pskString != null) "psk=${pskString}"
++ optionals (opts.auth != null) (filter (x: x != "") (splitString "\n" opts.auth))
++ optional (opts.priority != null) "priority=${toString opts.priority}"
++ optional (opts.extraConfig != "") opts.extraConfig;
in ''
network={
${concatMapStringsSep "\n" indent options}
}
'';
# Creates a systemd unit for wpa_supplicant bound to a given (or any) interface
mkUnit = iface:
let
deviceUnit = optional (iface != null) "sys-subsystem-net-devices-${utils.escapeSystemdPath iface}.device";
configStr = if cfg.allowAuxiliaryImperativeNetworks
then "-c /etc/wpa_supplicant.conf -I ${finalConfig}"
else "-c ${finalConfig}";
in {
description = "WPA Supplicant instance" + optionalString (iface != null) " for interface ${iface}";
after = deviceUnit;
before = [ "network.target" ];
wants = [ "network.target" ];
requires = deviceUnit;
wantedBy = [ "multi-user.target" ];
stopIfChanged = false;
path = [ package ];
serviceConfig.RuntimeDirectory = "wpa_supplicant";
serviceConfig.RuntimeDirectoryMode = "700";
serviceConfig.EnvironmentFile = mkIf (cfg.environmentFile != null)
(builtins.toString cfg.environmentFile);
script =
''
${optionalString configIsGenerated ''
if [ -f /etc/wpa_supplicant.conf ]; then
echo >&2 "<3>/etc/wpa_supplicant.conf present but ignored. Generated ${configFile} is used instead."
fi
''}
# substitute environment variables
${pkgs.gawk}/bin/awk '{
for(varname in ENVIRON)
gsub("@"varname"@", ENVIRON[varname])
print
}' "${configFile}" > "${finalConfig}"
iface_args="-s ${optionalString cfg.dbusControlled "-u"} -D${cfg.driver} ${configStr}"
${if iface == null then ''
# detect interfaces automatically
# check if there are no wireless interfaces
if ! find -H /sys/class/net/* -name wireless | grep -q .; then
# if so, wait until one appears
echo "Waiting for wireless interfaces"
grep -q '^ACTION=add' < <(stdbuf -oL -- udevadm monitor -s net/wlan -pu)
# Note: the above line has been carefully written:
# 1. The process substitution avoids udevadm hanging (after grep has quit)
# until it tries to write to the pipe again. Not even pipefail works here.
# 2. stdbuf is needed because udevadm output is buffered by default and grep
# may hang until more udev events enter the pipe.
fi
# add any interface found to the daemon arguments
for name in $(find -H /sys/class/net/* -name wireless | cut -d/ -f 5); do
echo "Adding interface $name"
args+="''${args:+ -N} -i$name $iface_args"
done
'' else ''
# add known interface to the daemon arguments
args="-i${iface} $iface_args"
''}
# finally start daemon
exec wpa_supplicant $args
'';
};
systemctl = "/run/current-system/systemd/bin/systemctl";
in {
options = {
networking.wireless = {
enable = mkEnableOption "wpa_supplicant";
interfaces = mkOption {
type = types.listOf types.str;
default = [];
example = [ "wlan0" "wlan1" ];
description = ''
The interfaces <command>wpa_supplicant</command> will use. If empty, it will
automatically use all wireless interfaces.
<note><para>
A separate wpa_supplicant instance will be started for each interface.
</para></note>
'';
};
driver = mkOption {
type = types.str;
default = "nl80211,wext";
description = "Force a specific wpa_supplicant driver.";
};
allowAuxiliaryImperativeNetworks = mkEnableOption "support for imperative & declarative networks" // {
description = ''
Whether to allow configuring networks "imperatively" (e.g. via
<package>wpa_supplicant_gui</package>) and declaratively via
<xref linkend="opt-networking.wireless.networks" />.
Please note that this adds a custom patch to <package>wpa_supplicant</package>.
'';
};
scanOnLowSignal = mkOption {
type = types.bool;
default = true;
description = ''
Whether to periodically scan for (better) networks when the signal of
the current one is low. This will make roaming between access points
faster, but will consume more power.
'';
};
fallbackToWPA2 = mkOption {
type = types.bool;
default = true;
description = ''
Whether to fall back to WPA2 authentication protocols if WPA3 failed.
This allows old wireless cards (that lack recent features required by
WPA3) to connect to mixed WPA2/WPA3 access points.
To avoid possible downgrade attacks, disable this options.
'';
};
environmentFile = mkOption {
type = types.nullOr types.path;
default = null;
example = "/run/secrets/wireless.env";
description = ''
File consisting of lines of the form <literal>varname=value</literal>
to define variables for the wireless configuration.
See section "EnvironmentFile=" in <citerefentry>
<refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum>
</citerefentry> for a syntax reference.
Secrets (PSKs, passwords, etc.) can be provided without adding them to
the world-readable Nix store by defining them in the environment file and
referring to them in option <option>networking.wireless.networks</option>
with the syntax <literal>@varname@</literal>. Example:
<programlisting>
# content of /run/secrets/wireless.env
PSK_HOME=mypassword
PASS_WORK=myworkpassword
</programlisting>
<programlisting>
# wireless-related configuration
networking.wireless.environmentFile = "/run/secrets/wireless.env";
networking.wireless.networks = {
home.psk = "@PSK_HOME@";
work.auth = '''
eap=PEAP
identity="my-user@example.com"
password="@PASS_WORK@"
''';
};
</programlisting>
'';
};
networks = mkOption {
type = types.attrsOf (types.submodule {
options = {
psk = mkOption {
type = types.nullOr types.str;
default = null;
description = ''
The network's pre-shared key in plaintext defaulting
to being a network without any authentication.
<warning><para>
Be aware that this will be written to the nix store
in plaintext! Use an environment variable instead.
</para></warning>
<note><para>
Mutually exclusive with <varname>pskRaw</varname>.
</para></note>
'';
};
pskRaw = mkOption {
type = types.nullOr types.str;
default = null;
description = ''
The network's pre-shared key in hex defaulting
to being a network without any authentication.
<warning><para>
Be aware that this will be written to the nix store
in plaintext! Use an environment variable instead.
</para></warning>
<note><para>
Mutually exclusive with <varname>psk</varname>.
</para></note>
'';
};
authProtocols = mkOption {
default = [
# WPA2 and WPA3
"WPA-PSK" "WPA-EAP" "SAE"
# 802.11r variants of the above
"FT-PSK" "FT-EAP" "FT-SAE"
];
# The list can be obtained by running this command
# awk '
# /^# key_mgmt: /{ run=1 }
# /^#$/{ run=0 }
# /^# [A-Z0-9-]{2,}/{ if(run){printf("\"%s\"\n", $2)} }
# ' /run/current-system/sw/share/doc/wpa_supplicant/wpa_supplicant.conf.example
type = types.listOf (types.enum [
"WPA-PSK"
"WPA-EAP"
"IEEE8021X"
"NONE"
"WPA-NONE"
"FT-PSK"
"FT-EAP"
"FT-EAP-SHA384"
"WPA-PSK-SHA256"
"WPA-EAP-SHA256"
"SAE"
"FT-SAE"
"WPA-EAP-SUITE-B"
"WPA-EAP-SUITE-B-192"
"OSEN"
"FILS-SHA256"
"FILS-SHA384"
"FT-FILS-SHA256"
"FT-FILS-SHA384"
"OWE"
"DPP"
]);
description = ''
The list of authentication protocols accepted by this network.
This corresponds to the <literal>key_mgmt</literal> option in wpa_supplicant.
'';
};
auth = mkOption {
type = types.nullOr types.str;
default = null;
example = ''
eap=PEAP
identity="user@example.com"
password="@EXAMPLE_PASSWORD@"
'';
description = ''
Use this option to configure advanced authentication methods like EAP.
See
<citerefentry>
<refentrytitle>wpa_supplicant.conf</refentrytitle>
<manvolnum>5</manvolnum>
</citerefentry>
for example configurations.
<warning><para>
Be aware that this will be written to the nix
|