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