nixpkgs/modules/services/networking/openvpn.nix

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{ config, pkgs, ... }:
with pkgs.lib;
let
cfg = config.services.openvpn;
inherit (pkgs) openvpn;
PATH = "${pkgs.iptables}/sbin:${pkgs.coreutils}/bin:${pkgs.iproute}/sbin:${pkgs.nettools}/sbin";
makeOpenVPNJob = cfg : name:
let
upScript = ''
#!/bin/sh
exec &> /var/log/openvpn-${name}-up
PATH=${PATH}
${cfg.up}
'';
downScript = ''
#!/bin/sh
exec &> /var/log/openvpn-${name}-down
PATH=${PATH}
${cfg.down}
'';
configFile = pkgs.writeText "openvpn-config-${name}"
''
${if cfg.up != "" || cfg.down != "" then "script-security 2" else ""}
${cfg.config}
${if cfg.up != "" then "up ${pkgs.writeScript "openvpn-${name}-up" upScript}" else "" }
${if cfg.down != "" then "down ${pkgs.writeScript "openvpn-${name}-down" downScript}" else "" }
'';
in {
description = "OpenVPN-${name}";
startOn = "network-interfaces/started";
stopOn = "network-interfaces/stop";
environment = { PATH = "${pkgs.coreutils}/bin"; };
script =
''
exec &> /var/log/openvpn-${name}
${config.system.sbin.modprobe} tun || true
${openvpn}/sbin/openvpn --config ${configFile}
'';
};
openvpnInstanceOptions = {
config = mkOption {
type = types.string;
description = ''
config of this openvpn instance
'';
};
up = mkOption {
default = "";
type = types.string;
description = ''
script which is run when server instance starts up succesfully.
Use it to setup firewall and routing
'';
};
down = mkOption {
default = "";
type = types.string;
description = ''
script which is run when server instance shuts down
Usually this reverts what up has done
'';
};
};
in
{
###### interface
options = {
services.openvpn = {
enable = mkOption {
default = false;
description = "Whether to enable OpenVPN.";
};
servers = mkOption {
default = {};
example = {
mostSimple = {
config = ''
# Most simple 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 static.key
'';
up = "ip route add ..!";
down = "ip route add ..!";
};
clientMostSimple = {
config = ''
#client:
#remote myremote.mydomain
#dev tun
#ifconfig 10.8.0.2 10.8.0.1
#secret static.key
'';
};
serverScalable = {
config = ''
multiple clienst
see example file found in http://openvpn.net/index.php/documentation/howto.html
'';
};
};
# !!! clean up this description please
description = ''
You can define multiple openvpn instances.
The id of an instance is given by the attribute name.
Each instance will result in a new job file.
Additionally you can specify the up/ down scripts by setting
the up down properties.
Config lines up=/nix/store/xxx-up-script down=...
will be appended to your configuration file automatically
If you define at least one of up/down "script-security 2" will be
prepended to your config otherwise you scripts aren't run by openvpn
Don't forget to check that the all package sizes can be sent. For
examlpe if scp hangs you should set --fragment XXX --mssfix YYY.
'';
type = types.attrsOf types.optionSet;
options = [ openvpnInstanceOptions ];
};
};
};
###### implementation
config = mkIf cfg.enable {
jobs = listToAttrs (mapAttrsFlatten (name: value: nameValuePair "openvpn-${name}" (makeOpenVPNJob value name)) cfg.servers);
};
}