429 lines
17 KiB
Nix
429 lines
17 KiB
Nix
{ config, lib, options, pkgs, utils, ... }:
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with lib;
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let
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cfg = config.services.wstunnel;
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attrsToArgs = attrs: utils.escapeSystemdExecArgs (
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mapAttrsToList
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(name: value: if value == true then "--${name}" else "--${name}=${value}")
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attrs
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);
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hostPortSubmodule = {
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options = {
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host = mkOption {
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description = mdDoc "The hostname.";
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type = types.str;
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};
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port = mkOption {
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description = mdDoc "The port.";
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type = types.port;
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};
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};
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};
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localRemoteSubmodule = {
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options = {
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local = mkOption {
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description = mdDoc "Local address and port to listen on.";
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type = types.submodule hostPortSubmodule;
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example = {
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host = "127.0.0.1";
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port = 51820;
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};
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};
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remote = mkOption {
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description = mdDoc "Address and port on remote to forward traffic to.";
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type = types.submodule hostPortSubmodule;
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example = {
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host = "127.0.0.1";
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port = 51820;
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};
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};
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};
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};
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hostPortToString = { host, port }: "${host}:${builtins.toString port}";
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localRemoteToString = { local, remote }: utils.escapeSystemdExecArg "${hostPortToString local}:${hostPortToString remote}";
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commonOptions = {
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enable = mkOption {
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description = mdDoc "Whether to enable this `wstunnel` instance.";
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type = types.bool;
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default = true;
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};
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package = mkPackageOption pkgs "wstunnel" {};
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autoStart = mkOption {
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description = mdDoc "Whether this tunnel server should be started automatically.";
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type = types.bool;
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default = true;
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};
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extraArgs = mkOption {
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description = mdDoc "Extra command line arguments to pass to `wstunnel`. Attributes of the form `argName = true;` will be translated to `--argName`, and `argName = \"value\"` to `--argName=value`.";
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type = with types; attrsOf (either str bool);
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default = {};
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example = {
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"someNewOption" = true;
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"someNewOptionWithValue" = "someValue";
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};
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};
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verboseLogging = mkOption {
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description = mdDoc "Enable verbose logging.";
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type = types.bool;
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default = false;
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};
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environmentFile = mkOption {
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description = mdDoc "Environment file to be passed to the systemd service. Useful for passing secrets to the service to prevent them from being world-readable in the Nix store. Note however that the secrets are passed to `wstunnel` through the command line, which makes them locally readable for all users of the system at runtime.";
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type = types.nullOr types.path;
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default = null;
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example = "/var/lib/secrets/wstunnelSecrets";
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};
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};
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serverSubmodule = { config, ...}: {
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options = commonOptions // {
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listen = mkOption {
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description = mdDoc "Address and port to listen on. Setting the port to a value below 1024 will also give the process the required `CAP_NET_BIND_SERVICE` capability.";
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type = types.submodule hostPortSubmodule;
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default = {
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host = "0.0.0.0";
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port = if config.enableHTTPS then 443 else 80;
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};
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defaultText = literalExpression ''
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{
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host = "0.0.0.0";
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port = if enableHTTPS then 443 else 80;
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}
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'';
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};
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restrictTo = mkOption {
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description = mdDoc "Accepted traffic will be forwarded only to this service. Set to `null` to allow forwarding to arbitrary addresses.";
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type = types.nullOr (types.submodule hostPortSubmodule);
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example = {
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host = "127.0.0.1";
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port = 51820;
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};
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};
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enableHTTPS = mkOption {
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description = mdDoc "Use HTTPS for the tunnel server.";
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type = types.bool;
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default = true;
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};
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tlsCertificate = mkOption {
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description = mdDoc "TLS certificate to use instead of the hardcoded one in case of HTTPS connections. Use together with `tlsKey`.";
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type = types.nullOr types.path;
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default = null;
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example = "/var/lib/secrets/cert.pem";
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};
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tlsKey = mkOption {
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description = mdDoc "TLS key to use instead of the hardcoded on in case of HTTPS connections. Use together with `tlsCertificate`.";
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type = types.nullOr types.path;
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default = null;
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example = "/var/lib/secrets/key.pem";
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};
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useACMEHost = mkOption {
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description = mdDoc "Use a certificate generated by the NixOS ACME module for the given host. Note that this will not generate a new certificate - you will need to do so with `security.acme.certs`.";
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type = types.nullOr types.str;
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default = null;
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example = "example.com";
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};
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};
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};
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clientSubmodule = { config, ... }: {
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options = commonOptions // {
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connectTo = mkOption {
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description = mdDoc "Server address and port to connect to.";
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type = types.submodule hostPortSubmodule;
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example = {
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host = "example.com";
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};
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};
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enableHTTPS = mkOption {
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description = mdDoc "Enable HTTPS when connecting to the server.";
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type = types.bool;
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default = true;
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};
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localToRemote = mkOption {
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description = mdDoc "Local hosts and ports to listen on, plus the hosts and ports on remote to forward traffic to. Setting a local port to a value less than 1024 will additionally give the process the required CAP_NET_BIND_SERVICE capability.";
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type = types.listOf (types.submodule localRemoteSubmodule);
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default = [];
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example = [ {
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local = {
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host = "127.0.0.1";
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port = 8080;
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};
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remote = {
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host = "127.0.0.1";
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port = 8080;
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};
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} ];
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};
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dynamicToRemote = mkOption {
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description = mdDoc "Host and port for the SOCKS5 proxy to dynamically forward traffic to. Leave this at `null` to disable the SOCKS5 proxy. Setting the port to a value less than 1024 will additionally give the service the required CAP_NET_BIND_SERVICE capability.";
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type = types.nullOr (types.submodule hostPortSubmodule);
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default = null;
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example = {
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host = "127.0.0.1";
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port = 1080;
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};
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};
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udp = mkOption {
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description = mdDoc "Whether to forward UDP instead of TCP traffic.";
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type = types.bool;
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default = false;
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};
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udpTimeout = mkOption {
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description = mdDoc "When using UDP forwarding, timeout in seconds after which the tunnel connection is closed. `-1` means no timeout.";
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type = types.int;
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default = 30;
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};
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httpProxy = mkOption {
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description = mdDoc ''
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Proxy to use to connect to the wstunnel server (`USER:PASS@HOST:PORT`).
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::: {.warning}
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Passwords specified here will be world-readable in the Nix store! To pass a password to the service, point the `environmentFile` option to a file containing `PROXY_PASSWORD=<your-password-here>` and set this option to `<user>:$PROXY_PASSWORD@<host>:<port>`. Note however that this will also locally leak the passwords at runtime via e.g. /proc/<pid>/cmdline.
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:::
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'';
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type = types.nullOr types.str;
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default = null;
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};
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soMark = mkOption {
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description = mdDoc "Mark network packets with the SO_MARK sockoption with the specified value. Setting this option will also enable the required `CAP_NET_ADMIN` capability for the systemd service.";
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type = types.nullOr types.int;
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default = null;
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};
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upgradePathPrefix = mkOption {
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description = mdDoc "Use a specific HTTP path prefix that will show up in the upgrade request to the `wstunnel` server. Useful when running `wstunnel` behind a reverse proxy.";
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type = types.nullOr types.str;
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default = null;
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example = "wstunnel";
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};
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hostHeader = mkOption {
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description = mdDoc "Use this as the HTTP host header instead of the real hostname. Useful for circumventing hostname-based firewalls.";
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type = types.nullOr types.str;
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default = null;
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};
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tlsSNI = mkOption {
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description = mdDoc "Use this as the SNI while connecting via TLS. Useful for circumventing hostname-based firewalls.";
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type = types.nullOr types.str;
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default = null;
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};
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tlsVerifyCertificate = mkOption {
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description = mdDoc "Whether to verify the TLS certificate of the server. It might be useful to set this to `false` when working with the `tlsSNI` option.";
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type = types.bool;
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default = true;
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};
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# The original argument name `websocketPingFrequency` is a misnomer, as the frequency is the inverse of the interval.
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websocketPingInterval = mkOption {
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description = mdDoc "Do a heartbeat ping every N seconds to keep up the websocket connection.";
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type = types.nullOr types.ints.unsigned;
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default = null;
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};
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upgradeCredentials = mkOption {
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description = mdDoc ''
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Use these credentials to authenticate during the HTTP upgrade request (Basic authorization type, `USER:[PASS]`).
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::: {.warning}
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Passwords specified here will be world-readable in the Nix store! To pass a password to the service, point the `environmentFile` option to a file containing `HTTP_PASSWORD=<your-password-here>` and set this option to `<user>:$HTTP_PASSWORD`. Note however that this will also locally leak the passwords at runtime via e.g. /proc/<pid>/cmdline.
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:::
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'';
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type = types.nullOr types.str;
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default = null;
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};
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customHeaders = mkOption {
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description = mdDoc "Custom HTTP headers to send during the upgrade request.";
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type = types.attrsOf types.str;
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default = {};
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example = {
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"X-Some-Header" = "some-value";
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};
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};
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};
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};
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generateServerUnit = name: serverCfg: {
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name = "wstunnel-server-${name}";
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value = {
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description = "wstunnel server - ${name}";
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requires = [ "network.target" "network-online.target" ];
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after = [ "network.target" "network-online.target" ];
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wantedBy = optional serverCfg.autoStart "multi-user.target";
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serviceConfig = let
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certConfig = config.security.acme.certs."${serverCfg.useACMEHost}";
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in {
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Type = "simple";
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ExecStart = with serverCfg; let
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resolvedTlsCertificate = if useACMEHost != null
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then "${certConfig.directory}/fullchain.pem"
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else tlsCertificate;
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resolvedTlsKey = if useACMEHost != null
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then "${certConfig.directory}/key.pem"
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else tlsKey;
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in ''
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${package}/bin/wstunnel \
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--server \
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${optionalString (restrictTo != null) "--restrictTo=${utils.escapeSystemdExecArg (hostPortToString restrictTo)}"} \
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${optionalString (resolvedTlsCertificate != null) "--tlsCertificate=${utils.escapeSystemdExecArg resolvedTlsCertificate}"} \
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${optionalString (resolvedTlsKey != null) "--tlsKey=${utils.escapeSystemdExecArg resolvedTlsKey}"} \
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${optionalString verboseLogging "--verbose"} \
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${attrsToArgs extraArgs} \
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${utils.escapeSystemdExecArg "${if enableHTTPS then "wss" else "ws"}://${hostPortToString listen}"}
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'';
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EnvironmentFile = optional (serverCfg.environmentFile != null) serverCfg.environmentFile;
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DynamicUser = true;
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SupplementaryGroups = optional (serverCfg.useACMEHost != null) certConfig.group;
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PrivateTmp = true;
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AmbientCapabilities = optionals (serverCfg.listen.port < 1024) [ "CAP_NET_BIND_SERVICE" ];
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NoNewPrivileges = true;
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RestrictNamespaces = "uts ipc pid user cgroup";
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ProtectSystem = "strict";
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ProtectHome = true;
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ProtectKernelTunables = true;
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ProtectKernelModules = true;
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ProtectControlGroups = true;
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PrivateDevices = true;
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RestrictSUIDSGID = true;
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};
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};
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};
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generateClientUnit = name: clientCfg: {
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name = "wstunnel-client-${name}";
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value = {
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description = "wstunnel client - ${name}";
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requires = [ "network.target" "network-online.target" ];
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after = [ "network.target" "network-online.target" ];
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wantedBy = optional clientCfg.autoStart "multi-user.target";
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serviceConfig = {
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Type = "simple";
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ExecStart = with clientCfg; ''
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${package}/bin/wstunnel \
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${concatStringsSep " " (builtins.map (x: "--localToRemote=${localRemoteToString x}") localToRemote)} \
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${concatStringsSep " " (mapAttrsToList (n: v: "--customHeaders=\"${n}: ${v}\"") customHeaders)} \
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${optionalString (dynamicToRemote != null) "--dynamicToRemote=${utils.escapeSystemdExecArg (hostPortToString dynamicToRemote)}"} \
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${optionalString udp "--udp"} \
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${optionalString (httpProxy != null) "--httpProxy=${httpProxy}"} \
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${optionalString (soMark != null) "--soMark=${toString soMark}"} \
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${optionalString (upgradePathPrefix != null) "--upgradePathPrefix=${upgradePathPrefix}"} \
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${optionalString (hostHeader != null) "--hostHeader=${hostHeader}"} \
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${optionalString (tlsSNI != null) "--tlsSNI=${tlsSNI}"} \
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${optionalString tlsVerifyCertificate "--tlsVerifyCertificate"} \
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${optionalString (websocketPingInterval != null) "--websocketPingFrequency=${toString websocketPingInterval}"} \
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${optionalString (upgradeCredentials != null) "--upgradeCredentials=${upgradeCredentials}"} \
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--udpTimeoutSec=${toString udpTimeout} \
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${optionalString verboseLogging "--verbose"} \
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${attrsToArgs extraArgs} \
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${utils.escapeSystemdExecArg "${if enableHTTPS then "wss" else "ws"}://${hostPortToString connectTo}"}
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'';
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EnvironmentFile = optional (clientCfg.environmentFile != null) clientCfg.environmentFile;
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DynamicUser = true;
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PrivateTmp = true;
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AmbientCapabilities = (optionals (clientCfg.soMark != null) [ "CAP_NET_ADMIN" ]) ++ (optionals ((clientCfg.dynamicToRemote.port or 1024) < 1024 || (any (x: x.local.port < 1024) clientCfg.localToRemote)) [ "CAP_NET_BIND_SERVICE" ]);
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NoNewPrivileges = true;
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RestrictNamespaces = "uts ipc pid user cgroup";
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ProtectSystem = "strict";
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ProtectHome = true;
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ProtectKernelTunables = true;
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ProtectKernelModules = true;
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ProtectControlGroups = true;
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PrivateDevices = true;
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RestrictSUIDSGID = true;
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};
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};
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};
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in {
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options.services.wstunnel = {
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enable = mkEnableOption (mdDoc "wstunnel");
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servers = mkOption {
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description = mdDoc "`wstunnel` servers to set up.";
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type = types.attrsOf (types.submodule serverSubmodule);
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default = {};
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example = {
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"wg-tunnel" = {
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listen.port = 8080;
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enableHTTPS = true;
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tlsCertificate = "/var/lib/secrets/fullchain.pem";
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tlsKey = "/var/lib/secrets/key.pem";
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restrictTo = {
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host = "127.0.0.1";
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port = 51820;
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};
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};
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};
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};
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clients = mkOption {
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description = mdDoc "`wstunnel` clients to set up.";
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type = types.attrsOf (types.submodule clientSubmodule);
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default = {};
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example = {
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"wg-tunnel" = {
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connectTo = {
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host = "example.com";
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port = 8080;
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};
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enableHTTPS = true;
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localToRemote = {
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local = {
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host = "127.0.0.1";
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port = 51820;
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};
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remote = {
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host = "127.0.0.1";
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port = 51820;
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};
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};
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udp = true;
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};
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};
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};
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};
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config = mkIf cfg.enable {
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systemd.services = (mapAttrs' generateServerUnit (filterAttrs (n: v: v.enable) cfg.servers)) // (mapAttrs' generateClientUnit (filterAttrs (n: v: v.enable) cfg.clients));
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assertions = (mapAttrsToList (name: serverCfg: {
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assertion = !(serverCfg.useACMEHost != null && (serverCfg.tlsCertificate != null || serverCfg.tlsKey != null));
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message = ''
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Options services.wstunnel.servers."${name}".useACMEHost and services.wstunnel.servers."${name}".{tlsCertificate, tlsKey} are mutually exclusive.
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'';
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}) cfg.servers) ++
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(mapAttrsToList (name: serverCfg: {
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assertion = !((serverCfg.tlsCertificate != null || serverCfg.tlsKey != null) && !(serverCfg.tlsCertificate != null && serverCfg.tlsKey != null));
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message = ''
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services.wstunnel.servers."${name}".tlsCertificate and services.wstunnel.servers."${name}".tlsKey need to be set together.
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'';
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}) cfg.servers) ++
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(mapAttrsToList (name: clientCfg: {
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assertion = !(clientCfg.localToRemote == [] && clientCfg.dynamicToRemote == null);
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message = ''
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Either one of services.wstunnel.clients."${name}".localToRemote or services.wstunnel.clients."${name}".dynamicToRemote must be set.
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'';
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}) cfg.clients);
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};
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meta.maintainers = with maintainers; [ alyaeanyx ];
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}
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