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# NixOS module for iodine, ip over dns daemon
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.iodine;
iodinedUser = "iodined";
/* is this path made unreadable by ProtectHome = true ? */
isProtected = x: hasPrefix "/root" x || hasPrefix "/home" x;
in
{
imports = [
(mkRenamedOptionModule [ "services" "iodined" "enable" ] [ "services" "iodine" "server" "enable" ])
(mkRenamedOptionModule [ "services" "iodined" "domain" ] [ "services" "iodine" "server" "domain" ])
(mkRenamedOptionModule [ "services" "iodined" "ip" ] [ "services" "iodine" "server" "ip" ])
(mkRenamedOptionModule [ "services" "iodined" "extraConfig" ] [ "services" "iodine" "server" "extraConfig" ])
(mkRemovedOptionModule [ "services" "iodined" "client" ] "")
];
### configuration
options = {
services.iodine = {
clients = mkOption {
default = {};
description = ''
Each attribute of this option defines a systemd service that
runs iodine. Many or none may be defined.
The name of each service is
<literal>iodine-<replaceable>name</replaceable></literal>
where <replaceable>name</replaceable> is the name of the
corresponding attribute name.
'';
example = literalExpression ''
{
foo = {
server = "tunnel.mdomain.com";
relay = "8.8.8.8";
extraConfig = "-v";
}
}
'';
type = types.attrsOf (
types.submodule (
{
options = {
server = mkOption {
type = types.str;
default = "";
description = "Hostname of server running iodined";
example = "tunnel.mydomain.com";
};
relay = mkOption {
type = types.str;
default = "";
description = "DNS server to use as an intermediate relay to the iodined server";
example = "8.8.8.8";
};
extraConfig = mkOption {
type = types.str;
default = "";
description = "Additional command line parameters";
example = "-l 192.168.1.10 -p 23";
};
passwordFile = mkOption {
type = types.str;
default = "";
description = "Path to a file containing the password.";
};
};
}
)
);
};
server = {
enable = mkOption {
type = types.bool;
default = false;
description = "enable iodined server";
};
ip = mkOption {
type = types.str;
default = "";
description = "The assigned ip address or ip range";
example = "172.16.10.1/24";
};
domain = mkOption {
type = types.str;
default = "";
description = "Domain or subdomain of which nameservers point to us";
example = "tunnel.mydomain.com";
};
extraConfig = mkOption {
type = types.str;
default = "";
description = "Additional command line parameters";
example = "-l 192.168.1.10 -p 23";
};
passwordFile = mkOption {
type = types.str;
default = "";
description = "File that contains password";
};
};
};
};
### implementation
config = mkIf (cfg.server.enable || cfg.clients != {}) {
environment.systemPackages = [ pkgs.iodine ];
boot.kernelModules = [ "tun" ];
systemd.services =
let
createIodineClientService = name: cfg:
{
description = "iodine client - ${name}";
after = [ "network.target" ];
wantedBy = [ "multi-user.target" ];
script = "exec ${pkgs.iodine}/bin/iodine -f -u ${iodinedUser} ${cfg.extraConfig} ${optionalString (cfg.passwordFile != "") "< \"${builtins.toString cfg.passwordFile}\""} ${cfg.relay} ${cfg.server}";
serviceConfig = {
RestartSec = "30s";
Restart = "always";
# hardening :
# Filesystem access
ProtectSystem = "strict";
ProtectHome = if isProtected cfg.passwordFile then "read-only" else "true" ;
PrivateTmp = true;
ReadWritePaths = "/dev/net/tun";
PrivateDevices = false;
ProtectKernelTunables = true;
ProtectKernelModules = true;
ProtectControlGroups = true;
# Caps
NoNewPrivileges = true;
# Misc.
LockPersonality = true;
RestrictRealtime = true;
PrivateMounts = true;
MemoryDenyWriteExecute = true;
};
};
in
listToAttrs (
mapAttrsToList
(name: value: nameValuePair "iodine-${name}" (createIodineClientService name value))
cfg.clients
) // {
iodined = mkIf (cfg.server.enable) {
description = "iodine, ip over dns server daemon";
after = [ "network.target" ];
wantedBy = [ "multi-user.target" ];
script = "exec ${pkgs.iodine}/bin/iodined -f -u ${iodinedUser} ${cfg.server.extraConfig} ${optionalString (cfg.server.passwordFile != "") "< \"${builtins.toString cfg.server.passwordFile}\""} ${cfg.server.ip} ${cfg.server.domain}";
serviceConfig = {
# Filesystem access
ProtectSystem = "strict";
ProtectHome = if isProtected cfg.server.passwordFile then "read-only" else "true" ;
PrivateTmp = true;
ReadWritePaths = "/dev/net/tun";
PrivateDevices = false;
ProtectKernelTunables = true;
ProtectKernelModules = true;
ProtectControlGroups = true;
# Caps
NoNewPrivileges = true;
# Misc.
LockPersonality = true;
RestrictRealtime = true;
PrivateMounts = true;
MemoryDenyWriteExecute = true;
};
};
};
users.users.${iodinedUser} = {
uid = config.ids.uids.iodined;
group = "iodined";
description = "Iodine daemon user";
};
users.groups.iodined.gid = config.ids.gids.iodined;
};
}
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