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nixpkgs/nixos/modules/services/networking/openvpn.nix
Eelco Dolstra 27a8cada79 openvpn: Add systemd startup notification
This causes OpenVPN services to reach the "active" state when the VPN
connection is up (i.e., after OpenVPN prints "Initialization Sequence
Completed"). This allows units to be ordered correctly after openvpn-*
units, and makes systemctl present a password prompt:

  $ start openvpn-foo
  Enter Private Key Password: *************

(I first tried to implement this by calling "systemd-notify --ready"
from the "up" script, but systemd-notify is not reliable.)
2014-04-22 13:14:58 +02:00

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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.openvpn;
inherit (pkgs) openvpn;
makeOpenVPNJob = cfg: name:
let
path = (getAttr "openvpn-${name}" config.systemd.services).path;
upScript = ''
#! /bin/sh
export PATH=${path}
# For convenience in client scripts, extract the remote domain
# name and name server.
for var in ''${!foreign_option_*}; do
x=(''${!var})
if [ "''${x[0]}" = dhcp-option ]; then
if [ "''${x[1]}" = DOMAIN ]; then domain="''${x[2]}"
elif [ "''${x[1]}" = DNS ]; then nameserver="''${x[2]}"
fi
fi
done
${cfg.up}
'';
downScript = ''
#! /bin/sh
export PATH=${path}
${cfg.down}
'';
configFile = pkgs.writeText "openvpn-config-${name}"
''
errors-to-stderr
${optionalString (cfg.up != "" || cfg.down != "") "script-security 2"}
${cfg.config}
${optionalString (cfg.up != "") "up ${pkgs.writeScript "openvpn-${name}-up" upScript}"}
${optionalString (cfg.down != "") "down ${pkgs.writeScript "openvpn-${name}-down" downScript}"}
'';
in {
description = "OpenVPN instance ${name}";
wantedBy = optional cfg.autoStart "multi-user.target";
after = [ "network-interfaces.target" ];
path = [ pkgs.iptables pkgs.iproute pkgs.nettools ];
serviceConfig.ExecStart = "@${openvpn}/sbin/openvpn openvpn --config ${configFile}";
serviceConfig.Restart = "always";
serviceConfig.Type = "notify";
};
in
{
###### interface
options = {
/* !!! Obsolete. */
services.openvpn.enable = mkOption {
default = true;
description = "Whether to enable OpenVPN.";
};
services.openvpn.servers = mkOption {
default = {};
example = literalExample ''
{
server = {
config = '''
# Simplest server configuration: http://openvpn.net/index.php/documentation/miscellaneous/static-key-mini-howto.html.
# server :
dev tun
ifconfig 10.8.0.1 10.8.0.2
secret /root/static.key
''';
up = "ip route add ...";
down = "ip route del ...";
};
client = {
config = '''
client
remote vpn.example.org
dev tun
proto tcp-client
port 8080
ca /root/.vpn/ca.crt
cert /root/.vpn/alice.crt
key /root/.vpn/alice.key
''';
up = "echo nameserver $nameserver | ''${pkgs.openresolv}/sbin/resolvconf -m 0 -a $dev";
down = "''${pkgs.openresolv}/sbin/resolvconf -d $dev";
};
}
'';
description = ''
Each attribute of this option defines a systemd service that
runs an OpenVPN instance. These can be OpenVPN servers or
clients. The name of each systemd service is
<literal>openvpn-<replaceable>name</replaceable>.service</literal>,
where <replaceable>name</replaceable> is the corresponding
attribute name.
'';
type = types.attrsOf types.optionSet;
options = {
config = mkOption {
type = types.lines;
description = ''
Configuration of this OpenVPN instance. See
<citerefentry><refentrytitle>openvpn</refentrytitle><manvolnum>8</manvolnum></citerefentry>
for details.
'';
};
up = mkOption {
default = "";
type = types.lines;
description = ''
Shell commands executed when the instance is starting.
'';
};
down = mkOption {
default = "";
type = types.lines;
description = ''
Shell commands executed when the instance is shutting down.
'';
};
autoStart = mkOption {
default = true;
type = types.bool;
description = "Whether this OpenVPN instance should be started automatically.";
};
};
};
};
###### implementation
config = mkIf (cfg.servers != {}) {
systemd.services = listToAttrs (mapAttrsFlatten (name: value: nameValuePair "openvpn-${name}" (makeOpenVPNJob value name)) cfg.servers);
environment.systemPackages = [ openvpn ];
boot.kernelModules = [ "tun" ];
};
}