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#![cfg_attr(docsrs, feature(doc_auto_cfg, doc_cfg))]
#![doc = include_str!("../README.md")]
// @@ begin lint list maintained by maint/add_warning @@
#![allow(renamed_and_removed_lints)] // @@REMOVE_WHEN(ci_arti_stable)
#![allow(unknown_lints)] // @@REMOVE_WHEN(ci_arti_nightly)
#![warn(missing_docs)]
#![warn(noop_method_call)]
#![warn(unreachable_pub)]
#![warn(clippy::all)]
#![deny(clippy::await_holding_lock)]
#![deny(clippy::cargo_common_metadata)]
#![deny(clippy::cast_lossless)]
#![deny(clippy::checked_conversions)]
#![warn(clippy::cognitive_complexity)]
#![deny(clippy::debug_assert_with_mut_call)]
#![deny(clippy::exhaustive_enums)]
#![deny(clippy::exhaustive_structs)]
#![deny(clippy::expl_impl_clone_on_copy)]
#![deny(clippy::fallible_impl_from)]
#![deny(clippy::implicit_clone)]
#![deny(clippy::large_stack_arrays)]
#![warn(clippy::manual_ok_or)]
#![deny(clippy::missing_docs_in_private_items)]
#![warn(clippy::needless_borrow)]
#![warn(clippy::needless_pass_by_value)]
#![warn(clippy::option_option)]
#![deny(clippy::print_stderr)]
#![deny(clippy::print_stdout)]
#![warn(clippy::rc_buffer)]
#![deny(clippy::ref_option_ref)]
#![warn(clippy::semicolon_if_nothing_returned)]
#![warn(clippy::trait_duplication_in_bounds)]
#![deny(clippy::unchecked_duration_subtraction)]
#![deny(clippy::unnecessary_wraps)]
#![warn(clippy::unseparated_literal_suffix)]
#![deny(clippy::unwrap_used)]
#![allow(clippy::let_unit_value)] // This can reasonably be done for explicitness
#![allow(clippy::uninlined_format_args)]
#![allow(clippy::significant_drop_in_scrutinee)] // arti/-/merge_requests/588/#note_2812945
#![allow(clippy::result_large_err)] // temporary workaround for arti#587
#![allow(clippy::needless_raw_string_hashes)] // complained-about code is fine, often best
//! <!-- @@ end lint list maintained by maint/add_warning @@ -->
// Overrides specific to this crate:
#![allow(clippy::print_stderr)]
#![allow(clippy::print_stdout)]
pub mod cfg;
pub mod logging;
#[cfg(not(feature = "onion-service-service"))]
mod onion_proxy_disabled;
/// Helper:
/// Declare a series of modules as public if experimental_api is set,
/// and as non-public otherwise.
//
// TODO: We'd like to use visibility::make(pub) here, but it doesn't
// work on modules.
macro_rules! semipublic_mod {
{
$(
$( #[$meta:meta] )*
mod $name:ident ;
)*
} => {
$(
$( #[$meta])*
cfg_if::cfg_if! {
if #[cfg(feature="experimental-api")] {
pub mod $name;
} else {
mod $name;
}
}
)*
}
}
semipublic_mod! {
#[cfg(feature = "dns-proxy")]
mod dns;
mod exit;
#[cfg(feature="onion-service-service")]
mod onion_proxy;
mod process;
mod reload_cfg;
mod socks;
}
#[cfg(feature = "rpc")]
mod rpc;
use std::ffi::OsString;
use std::fmt::Write;
use std::sync::Arc;
pub use cfg::{
ApplicationConfig, ApplicationConfigBuilder, ArtiCombinedConfig, ArtiConfig, ArtiConfigBuilder,
ProxyConfig, ProxyConfigBuilder, SystemConfig, SystemConfigBuilder, ARTI_EXAMPLE_CONFIG,
};
pub use logging::{LoggingConfig, LoggingConfigBuilder};
use arti_client::config::default_config_files;
use arti_client::{TorClient, TorClientConfig};
use safelog::with_safe_logging_suppressed;
use tor_config::{ConfigurationSources, Listen};
use tor_rtcompat::{BlockOn, Runtime};
use anyhow::{Context, Error, Result};
use clap::{value_parser, Arg, ArgAction, Command};
#[allow(unused_imports)]
use tracing::{error, info, warn};
/// Shorthand for a boxed and pinned Future.
type PinnedFuture<T> = std::pin::Pin<Box<dyn futures::Future<Output = T>>>;
/// Create a runtime for Arti to use.
fn create_runtime() -> std::io::Result<impl Runtime> {
cfg_if::cfg_if! {
if #[cfg(feature="rpc")] {
// TODO RPC: Because of
// https://gitlab.torproject.org/tpo/core/arti/-/issues/837 , we can
// currently define our RPC methods on TorClient<PreferredRuntime>.
use tor_rtcompat::PreferredRuntime as ChosenRuntime;
} else if #[cfg(all(feature="tokio", feature="native-tls"))] {
use tor_rtcompat::tokio::TokioNativeTlsRuntime as ChosenRuntime;
} else if #[cfg(all(feature="tokio", feature="rustls"))] {
use tor_rtcompat::tokio::TokioRustlsRuntime as ChosenRuntime;
let _idempotent_ignore = rustls_crate::crypto::CryptoProvider::install_default(
rustls_crate::crypto::ring::default_provider(),
);
} else if #[cfg(all(feature="async-std", feature="native-tls"))] {
use tor_rtcompat::async_std::AsyncStdNativeTlsRuntime as ChosenRuntime;
} else if #[cfg(all(feature="async-std", feature="rustls"))] {
use tor_rtcompat::async_std::AsyncStdRustlsRuntime as ChosenRuntime;
let _idempotent_ignore = rustls_crate::crypto::CryptoProvider::install_default(
rustls_crate::crypto::ring::default_provider(),
);
} else {
compile_error!("You must configure both an async runtime and a TLS stack. See doc/TROUBLESHOOTING.md for more.");
}
}
ChosenRuntime::create()
}
/// Return a (non-exhaustive) array of enabled Cargo features, for version printing purposes.
fn list_enabled_features() -> &'static [&'static str] {
// HACK(eta): We can't get this directly, so we just do this awful hack instead.
// Note that we only list features that aren't about the runtime used, since that already
// gets printed separately.
&[
#[cfg(feature = "journald")]
"journald",
#[cfg(any(feature = "static-sqlite", feature = "static"))]
"static-sqlite",
#[cfg(any(feature = "static-native-tls", feature = "static"))]
"static-native-tls",
]
}
/// Run the main loop of the proxy.
///
/// # Panics
///
/// Currently, might panic if things go badly enough wrong
#[cfg_attr(feature = "experimental-api", visibility::make(pub))]
#[cfg_attr(docsrs, doc(cfg(feature = "experimental-api")))]
async fn run<R: Runtime>(
runtime: R,
socks_listen: Listen,
dns_listen: Listen,
config_sources: ConfigurationSources,
arti_config: ArtiConfig,
client_config: TorClientConfig,
) -> Result<()> {
// Using OnDemand arranges that, while we are bootstrapping, incoming connections wait
// for bootstrap to complete, rather than getting errors.
use arti_client::BootstrapBehavior::OnDemand;
use futures::FutureExt;
#[cfg(feature = "rpc")]
let rpc_path = {
if let Some(path) = &arti_config.rpc().rpc_listen {
let path = path.path()?;
let parent = path
.parent()
.ok_or(anyhow::anyhow!("No parent directory for rpc_listen path?"))?;
client_config
.fs_mistrust()
.verifier()
.make_secure_dir(parent)?;
// It's just a unix thing; if we leave this sitting around, binding to it won't
// work right. There is probably a better solution.
if path.exists() {
std::fs::remove_file(&path)?;
}
Some(path)
} else {
None
}
};
let client_builder = TorClient::with_runtime(runtime.clone())
.config(client_config)
.bootstrap_behavior(OnDemand);
let client = client_builder.create_unbootstrapped()?;
#[allow(unused_mut)]
let mut reconfigurable_modules: Vec<Arc<dyn reload_cfg::ReconfigurableModule>> = vec![
Arc::new(client.clone()),
Arc::new(reload_cfg::Application::new(arti_config.clone())),
];
#[cfg(feature = "onion-service-service")]
{
let onion_services =
onion_proxy::ProxySet::launch_new(&client, arti_config.onion_services.clone())?;
reconfigurable_modules.push(Arc::new(onion_services));
}
// We weak references here to prevent the thread spawned by watch_for_config_changes from
// keeping these modules alive after this function exits.
//
// NOTE: reconfigurable_modules stores the only strong references to these modules,
// so we must keep the variable alive until the end of the function
let weak_modules = reconfigurable_modules.iter().map(Arc::downgrade).collect();
reload_cfg::watch_for_config_changes(
client.runtime(),
config_sources,
&arti_config,
weak_modules,
)?;
#[cfg(all(feature = "rpc", feature = "tokio"))]
let rpc_mgr = {
// TODO RPC This code doesn't really belong here; it's just an example.
if let Some(listen_path) = rpc_path {
// TODO Conceivably this listener belongs on a renamed "proxy" list.
Some(rpc::launch_rpc_listener(
&runtime,
listen_path,
client.clone(),
)?)
} else {
None
}
};
let mut proxy: Vec<PinnedFuture<(Result<()>, &str)>> = Vec::new();
if !socks_listen.is_empty() {
let runtime = runtime.clone();
let client = client.isolated_client();
proxy.push(Box::pin(async move {
let res = socks::run_socks_proxy(
runtime,
client,
socks_listen,
#[cfg(all(feature = "rpc", feature = "tokio"))]
rpc_mgr,
)
.await;
(res, "SOCKS")
}));
}
#[cfg(feature = "dns-proxy")]
if !dns_listen.is_empty() {
let runtime = runtime.clone();
let client = client.isolated_client();
proxy.push(Box::pin(async move {
let res = dns::run_dns_resolver(runtime, client, dns_listen).await;
(res, "DNS")
}));
}
#[cfg(not(feature = "dns-proxy"))]
if !dns_listen.is_empty() {
warn!(
"Tried to specify a DNS proxy address, but Arti was built without dns-proxy support."
);
return Ok(());
}
if proxy.is_empty() {
warn!("No proxy port set; specify -p PORT (for `socks_port`) or -d PORT (for `dns_port`). Alternatively, use the `socks_port` or `dns_port` configuration option.");
return Ok(());
}
let proxy = futures::future::select_all(proxy).map(|(finished, _index, _others)| finished);
futures::select!(
r = exit::wait_for_ctrl_c().fuse()
=> r.context("waiting for termination signal"),
r = proxy.fuse()
=> r.0.context(format!("{} proxy failure", r.1)),
r = async {
client.bootstrap().await?;
info!("Sufficiently bootstrapped; system SOCKS now functional.");
futures::future::pending::<Result<()>>().await
}.fuse()
=> r.context("bootstrap"),
)?;
// The modules can be dropped now, because we are exiting.
drop(reconfigurable_modules);
Ok(())
}
/// Inner function, to handle a set of CLI arguments and return a single
/// `Result<()>` for convenient handling.
///
/// # ⚠️ Warning! ⚠️
///
/// If your program needs to call this function, you are setting yourself up for
/// some serious maintenance headaches. See discussion on [`main`] and please
/// reach out to help us build you a better API.
///
/// # Panics
///
/// Currently, might panic if wrong arguments are specified.
#[cfg_attr(feature = "experimental-api", visibility::make(pub))]
fn main_main<I, T>(cli_args: I) -> Result<()>
where
I: IntoIterator<Item = T>,
T: Into<std::ffi::OsString> + Clone,
{
// We describe a default here, rather than using `default()`, because the
// correct behavior is different depending on whether the filename is given
// explicitly or not.
let mut config_file_help = "Specify which config file(s) to read.".to_string();
if let Ok(default) = default_config_files() {
// If we couldn't resolve the default config file, then too bad. If something
// actually tries to use it, it will produce an error, but don't fail here
// just for that reason.
write!(config_file_help, " Defaults to {:?}", default).unwrap();
}
// We create the runtime now so that we can use its `Debug` impl to describe it for
// the version string.
let runtime = create_runtime()?;
let features = list_enabled_features();
let long_version = format!(
"{}\nusing runtime: {:?}\noptional features: {}",
env!("CARGO_PKG_VERSION"),
runtime,
if features.is_empty() {
"<none>".into()
} else {
features.join(", ")
}
);
let clap_app = Command::new("Arti")
.version(env!("CARGO_PKG_VERSION"))
.long_version(long_version)
.author("The Tor Project Developers")
.about("A Rust Tor implementation.")
// HACK(eta): clap generates "arti [OPTIONS] <SUBCOMMAND>" for this usage string by
// default, but then fails to parse options properly if you do put them
// before the subcommand.
// We just declare all options as `global` and then require them to be
// put after the subcommand, hence this new usage string.
.override_usage("arti <SUBCOMMAND> [OPTIONS]")
.arg(
Arg::new("config-files")
.short('c')
.long("config")
.action(ArgAction::Set)
.value_name("FILE")
.value_parser(value_parser!(OsString))
.action(ArgAction::Append)
// NOTE: don't forget the `global` flag on all arguments declared at this level!
.global(true)
.help(config_file_help),
)
.arg(
Arg::new("option")
.short('o')
.action(ArgAction::Set)
.value_name("KEY=VALUE")
.action(ArgAction::Append)
.global(true)
.help("Override config file parameters, using TOML-like syntax."),
)
.arg(
Arg::new("loglevel")
.short('l')
.long("log-level")
.global(true)
.action(ArgAction::Set)
.value_name("LEVEL")
.help("Override the log level (usually one of 'trace', 'debug', 'info', 'warn', 'error')."),
)
.arg(
Arg::new("disable-fs-permission-checks")
.long("disable-fs-permission-checks")
.global(true)
.action(ArgAction::SetTrue)
.help("Don't check permissions on the files we use."),
)
.subcommand(
Command::new("proxy")
.about(
"Run Arti in SOCKS proxy mode, proxying connections through the Tor network.",
)
.arg(
Arg::new("socks-port")
.short('p')
.action(ArgAction::Set)
.value_name("PORT")
.help("Port to listen on for SOCKS connections (overrides the port in the config if specified).")
)
.arg(
Arg::new("dns-port")
.short('d')
.action(ArgAction::Set)
.value_name("PORT")
.help("Port to listen on for DNS request (overrides the port in the config if specified).")
)
)
.subcommand_required(true)
.arg_required_else_help(true);
// When adding a subcommand, it may be necessary to add an entry in
// `maint/check-cli-help`, to the function `help_arg`.
cfg_if::cfg_if! {
// TODO (#1250): test the CLI.
if #[cfg(feature = "onion-service-service")] {
let clap_app = clap_app.subcommand(
Command::new("hss")
.about(
"Run state management commands for an Arti hidden service",
)
.arg(
Arg::new("nickname")
.short('n')
.long("nickname")
.action(ArgAction::Set)
.value_name("HS_NICKNAME")
.required(true)
.help("The nickname of the service")
)
.subcommand_required(true)
.arg_required_else_help(true)
.subcommand(
Command::new("onion-name")
.about(
"Print the .onion address of a hidden service",
)
)
);
}
}
// Tracing doesn't log anything when there is no subscriber set. But we want to see
// logging messages from config parsing etc. We can't set the global default subscriber
// because we can only set it once. The other ways involve a closure. So we have a
// closure for all the startup code which runs *before* we set the logging properly.
//
// There is no cooked way to print our program name, so we do it like this. This
// closure is called to "make" a "Writer" for each message, so it runs at the right time:
// before each message.
let pre_config_logging_writer = || {
// Weirdly, with .without_time(), tracing produces messages with a leading space.
eprint!("arti:");
std::io::stderr()
};
let pre_config_logging = tracing_subscriber::fmt()
.without_time()
.with_writer(pre_config_logging_writer)
.finish();
let pre_config_logging = tracing::Dispatch::new(pre_config_logging);
let pre_config_logging_ret = tracing::dispatcher::with_default(&pre_config_logging, || {
let matches = clap_app.try_get_matches_from(cli_args)?;
let fs_mistrust_disabled = matches.get_flag("disable-fs-permission-checks");
// A Mistrust object to use for loading our configuration. Elsewhere, we
// use the value _from_ the configuration.
let cfg_mistrust = if fs_mistrust_disabled {
fs_mistrust::Mistrust::new_dangerously_trust_everyone()
} else {
fs_mistrust::MistrustBuilder::default()
.controlled_by_env_var(arti_client::config::FS_PERMISSIONS_CHECKS_DISABLE_VAR)
.build()
.expect("Could not construct default fs-mistrust")
};
let mut override_options: Vec<String> = matches
.get_many::<String>("option")
.unwrap_or_default()
.cloned()
.collect();
if fs_mistrust_disabled {
override_options.push("storage.permissions.dangerously_trust_everyone=true".to_owned());
}
let cfg_sources = {
let mut cfg_sources = ConfigurationSources::try_from_cmdline(
|| default_config_files().context("identify default config file locations"),
matches
.get_many::<OsString>("config-files")
.unwrap_or_default(),
override_options,
)?;
cfg_sources.set_mistrust(cfg_mistrust);
cfg_sources
};
let cfg = cfg_sources.load()?;
let (config, client_config) =
tor_config::resolve::<ArtiCombinedConfig>(cfg).context("read configuration")?;
let log_mistrust = client_config.fs_mistrust().clone();
Ok::<_, Error>((matches, cfg_sources, config, client_config, log_mistrust))
})?;
// Sadly I don't seem to be able to persuade rustfmt to format the two lists of
// variable names identically.
let (matches, cfg_sources, config, client_config, log_mistrust) = pre_config_logging_ret;
let _log_guards = logging::setup_logging(
config.logging(),
&log_mistrust,
matches.get_one::<String>("loglevel").map(|s| s.as_str()),
)?;
if !config.application().allow_running_as_root {
process::exit_if_root();
}
#[cfg(feature = "harden")]
if !config.application().permit_debugging {
if let Err(e) = process::enable_process_hardening() {
error!("Encountered a problem while enabling hardening. To disable this feature, set application.permit_debugging to true.");
return Err(e);
}
}
if let Some(proxy_matches) = matches.subcommand_matches("proxy") {
// Override configured SOCKS and DNS listen addresses from the command line.
// This implies listening on localhost ports.
let socks_listen = match proxy_matches.get_one::<String>("socks-port") {
Some(p) => Listen::new_localhost(p.parse().expect("Invalid port specified")),
None => config.proxy().socks_listen.clone(),
};
let dns_listen = match proxy_matches.get_one::<String>("dns-port") {
Some(p) => Listen::new_localhost(p.parse().expect("Invalid port specified")),
None => config.proxy().dns_listen.clone(),
};
info!(
"Starting Arti {} in SOCKS proxy mode on {} ...",
env!("CARGO_PKG_VERSION"),
socks_listen
);
process::use_max_file_limit(&config);
let rt_copy = runtime.clone();
rt_copy.block_on(run(
runtime,
socks_listen,
dns_listen,
cfg_sources,
config,
client_config,
))?;
Ok(())
} else {
cfg_if::cfg_if! {
if #[cfg(feature = "onion-service-service")] {
// TODO: this will soon grow more complex, so all of the code for handling the
// hss subcommand should probably be extracted in a separate module
if let Some(hss_matches) = matches.subcommand_matches("hss") {
let nickname = hss_matches
.get_one::<String>("nickname")
.expect("non-optional nickname flag not specified?!");
if let Some(_onion_name_matches) = hss_matches.subcommand_matches("onion-name") {
let nickname = tor_hsservice::HsNickname::try_from(nickname.clone())?;
let Some(svc_config) = config.onion_services
.into_iter()
.find(|(n, _)| *n == nickname)
.map(|(_, cfg)| cfg.svc_cfg) else {
println!("Service {nickname} is not configured");
return Ok(());
};
// TODO: PreferredRuntime was arbitrarily chosen and is entirely unused
// (we have to specify a concrete type for the runtime when calling
// TorClient::create_onion_service).
//
// Maybe this suggests TorClient is not the right place for
// create_onion_service()
let onion_svc = TorClient::<tor_rtcompat::PreferredRuntime>::create_onion_service(
&client_config,
svc_config
)?;
// TODO: instead of the printlns here, we should have a formatter type that
// decides how to display the output
if let Some(onion) = onion_svc.onion_name() {
println!("{onion}");
} else {
println!("Service {nickname} does not exist, or does not have an K_hsid yet");
}
return Ok(());
}
}
}
}
panic!("Subcommand added to clap subcommand list, but not yet implemented")
}
}
/// Main program, callable directly from a binary crate's `main`
///
/// This function behaves the same as `main_main()`, except:
/// * It takes command-line arguments from `std::env::args_os` rather than
/// from an argument.
/// * It exits the process with an appropriate error code on error.
///
/// # ⚠️ Warning ⚠️
///
/// Calling this function, or the related experimental function `main_main`, is
/// probably a bad idea for your code. It means that you are invoking Arti as
/// if from the command line, but keeping it embedded inside your process. Doing
/// this will block your process take over handling for several signal types,
/// possibly disable debugger attachment, and a lot more junk that a library
/// really has no business doing for you. It is not designed to run in this
/// way, and may give you strange results.
///
/// If the functionality you want is available in [`arti_client`] crate, or from
/// a *non*-experimental API in this crate, it would be better for you to use
/// that API instead.
///
/// Alternatively, if you _do_ need some underlying function from the `arti`
/// crate, it would be better for all of us if you had a stable interface to that
/// function. Please reach out to the Arti developers, so we can work together
/// to get you the stable API you need.
pub fn main() {
match main_main(std::env::args_os()) {
Ok(()) => {}
Err(e) => {
use arti_client::HintableError;
if let Some(hint) = e.hint() {
info!("{}", hint);
}
match e.downcast_ref::<clap::Error>() {
Some(clap_err) => clap_err.exit(),
None => with_safe_logging_suppressed(|| tor_error::report_and_exit(e)),
}
}
}
}