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nixpkgs/nixos/modules/services/networking/wpa_supplicant.nix

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Nix

{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.networking.wireless;
configFile = if cfg.networks != {} then pkgs.writeText "wpa_supplicant.conf" ''
${optionalString cfg.userControlled.enable ''
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=${cfg.userControlled.group}
update_config=1''}
${concatStringsSep "\n" (mapAttrsToList (ssid: config: with config; let
key = if psk != null
then ''"${psk}"''
else pskRaw;
baseAuth = if key != null
then ''psk=${key}''
else ''key_mgmt=NONE'';
in ''
network={
ssid="${ssid}"
${optionalString (priority != null) ''priority=${toString priority}''}
${optionalString hidden "scan_ssid=1"}
${if (auth != null) then auth else baseAuth}
${extraConfig}
}
'') cfg.networks)}
'' else "/etc/wpa_supplicant.conf";
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.
'';
};
driver = mkOption {
type = types.str;
default = "nl80211,wext";
description = "Force a specific wpa_supplicant driver.";
};
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.
Be aware that these will be written to the nix store
in plaintext!
Mutually exclusive with <varname>pskRaw</varname>.
'';
};
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.
Mutually exclusive with <varname>psk</varname>.
'';
};
auth = mkOption {
type = types.nullOr types.str;
default = null;
example = ''
key_mgmt=WPA-EAP
eap=PEAP
identity="user@example.com"
password="secret"
'';
description = ''
Use this option to configure advanced authentication methods like EAP.
See wpa_supplicant.conf(5) for example configurations.
Mutually exclusive with <varname>psk</varname> and <varname>pskRaw</varname>.
'';
};
hidden = mkOption {
type = types.bool;
default = false;
description = ''
Set this to <literal>true</literal> if the SSID of the network is hidden.
'';
};
priority = mkOption {
type = types.nullOr types.int;
default = null;
description = ''
By default, all networks will get same priority group (0). If some of the
networks are more desirable, this field can be used to change the order in
which wpa_supplicant goes through the networks when selecting a BSS. The
priority groups will be iterated in decreasing priority (i.e., the larger the
priority value, the sooner the network is matched against the scan results).
Within each priority group, networks will be selected based on security
policy, signal strength, etc.
'';
};
extraConfig = mkOption {
type = types.str;
default = "";
example = ''
bssid_blacklist=02:11:22:33:44:55 02:22:aa:44:55:66
'';
description = ''
Extra configuration lines appended to the network block.
See wpa_supplicant.conf(5) for available options.
'';
};
};
});
description = ''
The network definitions to automatically connect to when
<command>wpa_supplicant</command> is running. If this
parameter is left empty wpa_supplicant will use
/etc/wpa_supplicant.conf as the configuration file.
'';
default = {};
example = literalExample ''
{ echelon = {
psk = "abcdefgh";
};
"free.wifi" = {};
}
'';
};
userControlled = {
enable = mkOption {
type = types.bool;
default = false;
description = ''
Allow normal users to control wpa_supplicant through wpa_gui or wpa_cli.
This is useful for laptop users that switch networks a lot and don't want
to depend on a large package such as NetworkManager just to pick nearby
access points.
When using a declarative network specification you cannot persist any
settings via wpa_gui or wpa_cli.
'';
};
group = mkOption {
type = types.str;
default = "wheel";
example = "network";
description = "Members of this group can control wpa_supplicant.";
};
};
};
};
config = mkIf cfg.enable {
assertions = flip mapAttrsToList cfg.networks (name: cfg: {
assertion = with cfg; count (x: x != null) [ psk pskRaw auth ] <= 1;
message = ''options networking.wireless."${name}".{psk,pskRaw,auth} are mutually exclusive'';
});
environment.systemPackages = [ pkgs.wpa_supplicant ];
services.dbus.packages = [ pkgs.wpa_supplicant ];
# FIXME: start a separate wpa_supplicant instance per interface.
systemd.services.wpa_supplicant = let
ifaces = cfg.interfaces;
deviceUnit = interface: [ "sys-subsystem-net-devices-${interface}.device" ];
in {
description = "WPA Supplicant";
after = lib.concatMap deviceUnit ifaces;
before = [ "network.target" ];
wants = [ "network.target" ];
requires = lib.concatMap deviceUnit ifaces;
wantedBy = [ "multi-user.target" ];
stopIfChanged = false;
path = [ pkgs.wpa_supplicant ];
script = ''
${if ifaces == [] then ''
for i in $(cd /sys/class/net && echo *); do
DEVTYPE=
source /sys/class/net/$i/uevent
if [ "$DEVTYPE" = "wlan" -o -e /sys/class/net/$i/wireless ]; then
ifaces="$ifaces''${ifaces:+ -N} -i$i"
fi
done
'' else ''
ifaces="${concatStringsSep " -N " (map (i: "-i${i}") ifaces)}"
''}
exec wpa_supplicant -s -u -D${cfg.driver} -c ${configFile} $ifaces
'';
};
powerManagement.resumeCommands = ''
${config.systemd.package}/bin/systemctl try-restart wpa_supplicant
'';
# Restart wpa_supplicant when a wlan device appears or disappears.
services.udev.extraRules = ''
ACTION=="add|remove", SUBSYSTEM=="net", ENV{DEVTYPE}=="wlan", RUN+="${config.systemd.package}/bin/systemctl try-restart wpa_supplicant.service"
'';
};
meta.maintainers = with lib.maintainers; [ globin ];
}