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//! Implement a simple SOCKS proxy that relays connections over Tor.
//!
//! A proxy is launched with [`run_socks_proxy()`], which listens for new
//! connections and then runs
use futures::future::FutureExt;
use futures::io::{AsyncRead, AsyncReadExt, AsyncWrite, AsyncWriteExt, Error as IoError};
use futures::stream::StreamExt;
use futures::task::SpawnExt;
use safelog::sensitive;
use std::io::Result as IoResult;
use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
#[cfg(feature = "rpc")]
use std::sync::Arc;
use tracing::{debug, error, info, warn};
use arti_client::{ErrorKind, HasKind, StreamPrefs, TorClient};
use tor_config::Listen;
use tor_error::warn_report;
#[cfg(feature = "rpc")]
use tor_rpcbase as rpc;
use tor_rtcompat::{Runtime, TcpListener};
use tor_socksproto::{SocksAddr, SocksAuth, SocksCmd, SocksRequest};
use anyhow::{anyhow, Context, Result};
/// Payload to return when an HTTP connection arrive on a Socks port
const WRONG_PROTOCOL_PAYLOAD: &[u8] = br#"HTTP/1.0 501 Tor is not an HTTP Proxy
Content-Type: text/html; charset=utf-8
<!DOCTYPE html>
<html>
<head>
<title>This is a SOCKS Proxy, Not An HTTP Proxy</title>
</head>
<body>
<h1>This is a SOCKs proxy, not an HTTP proxy.</h1>
<p>
It appears you have configured your web browser to use this Tor port as
an HTTP proxy.
</p><p>
This is not correct: This port is configured as a SOCKS proxy, not
an HTTP proxy. If you need an HTTP proxy tunnel, wait for Arti to
add support for it in place of, or in addition to, socks_port.
Please configure your client accordingly.
</p>
<p>
See <a href="https://gitlab.torproject.org/tpo/core/arti/#todo-need-to-change-when-arti-get-a-user-documentation">https://gitlab.torproject.org/tpo/core/arti</a> for more information.
</p>
</body>
</html>"#;
/// Find out which kind of address family we can/should use for a
/// given `SocksRequest`.
#[cfg_attr(feature = "experimental-api", visibility::make(pub))]
fn stream_preference(req: &SocksRequest, addr: &str) -> StreamPrefs {
let mut prefs = StreamPrefs::new();
if addr.parse::<Ipv4Addr>().is_ok() {
// If they asked for an IPv4 address correctly, nothing else will do.
prefs.ipv4_only();
} else if addr.parse::<Ipv6Addr>().is_ok() {
// If they asked for an IPv6 address correctly, nothing else will do.
prefs.ipv6_only();
} else if req.version() == tor_socksproto::SocksVersion::V4 {
// SOCKS4 and SOCKS4a only support IPv4
prefs.ipv4_only();
} else {
// Otherwise, default to saying IPv4 is preferred.
prefs.ipv4_preferred();
}
prefs
}
/// A Key used to isolate connections.
///
/// Composed of an usize (representing which listener socket accepted
/// the connection, the source IpAddr of the client, and the
/// authentication string provided by the client).
#[derive(Debug, Clone, PartialEq, Eq)]
struct SocksIsolationKey(ConnIsolation, SocksAuth);
impl arti_client::isolation::IsolationHelper for SocksIsolationKey {
fn compatible_same_type(&self, other: &Self) -> bool {
self == other
}
fn join_same_type(&self, other: &Self) -> Option<Self> {
if self == other {
Some(self.clone())
} else {
None
}
}
}
/// The meaning of a SOCKS authentication field, according to our conventions.
enum AuthInterpretation {
/// Assign this stream to a client determined by given RPC session, and
/// register its existence with that session.
#[cfg(feature = "rpc")]
AssignStreamToRpcSession {
/// The RPC session-like object to use in determining our client.
session: rpc::ObjectId,
/// An identifier to assign to this stream.
///
/// TODO RPC: We need to figure out the semantics for this, and
/// implement them.
stream_id: String,
},
/// Isolate this stream from other streams that do not have the same
/// SocksAuth value.
IsolateStream(SocksAuth),
}
/// Given the authentication object from a socks connection, determine what it's telling
/// us to do.
///
/// (In no case is it actually SOCKS authentication: it can either be a message
/// to the stream isolation system or the RPC system.)
fn interpret_socks_auth(auth: &SocksAuth) -> Result<AuthInterpretation> {
// TODO RPC: This whole function and the way that it parses SOCKS
// authentication is a placeholder (because we need to put _something_ here
// for now). We could probably come up with a much better design, and
// should.
//
// TODO RPC: In our final design we should probably figure out way to
// migrate away from the current "anything goes" approach to stream
// isolation without breaking all the existing apps that think they can use
// an arbitrary byte-string as their isolation token.
/// A constant which, when it appears as a username, indicates that the
/// stream is to be assigned to an Arti RPC session.
const RPC_SESSION_CONST: &[u8] = b"<arti-rpc-session>";
use AuthInterpretation::*;
#[allow(unused_variables)] // TODO RPC remove
match auth {
SocksAuth::Username(user, pass) if user == RPC_SESSION_CONST => {
cfg_if::cfg_if! {
if #[cfg(feature="rpc")] {
let pass =
std::str::from_utf8(pass).context("rpc-session info must be utf-8")?;
let (session, stream_id) =
pass.split_once(':').context("Did not find stream id")?;
Ok(AssignStreamToRpcSession {
session: session.to_owned().into(),
stream_id: stream_id.to_owned(),
})
} else {
Err(anyhow!("Not built with support for RPC"))
}
}
}
other_auth => Ok(IsolateStream(other_auth.clone())),
}
}
/// Information used to implement a SOCKS connection.
struct SocksConnContext<R: Runtime> {
/// A TorClient to use (by default) to anonymize requests.
tor_client: TorClient<R>,
/// If present, an RpcMgr to use when for attaching requests to RPC
/// sessions.
#[cfg(feature = "rpc")]
rpc_mgr: Option<Arc<arti_rpcserver::RpcMgr>>,
}
/// Type alias for the isolation information associated with a given SOCKS
/// connection _before_ SOCKS is negotiated.
///
/// Currently this is an index for which listener accepted the connection, plus
/// the address of the client that connected to the Socks port.
type ConnIsolation = (usize, IpAddr);
impl<R: Runtime> SocksConnContext<R> {
/// Interpret a SOCKS request and our input information to determine which
/// TorClient object and StreamPrefs we should use.
///
/// TODO RPC: This API is horrible and needs revision; once it gets it, we
/// should document it much better.
fn get_prefs_and_session(
&self,
request: &SocksRequest,
target_addr: &str,
conn_isolation: ConnIsolation,
) -> Result<(StreamPrefs, TorClient<R>)> {
use AuthInterpretation as AI;
// Determine whether we want to ask for IPv4/IPv6 addresses.
let mut prefs = stream_preference(request, target_addr);
let tor_client = match interpret_socks_auth(request.auth())? {
#[cfg(feature = "rpc")]
AI::AssignStreamToRpcSession { session, stream_id } => {
if let Some(mgr) = &self.rpc_mgr {
let session = mgr
.lookup_object(&session)
.context("no such session found")?;
// TODO RPC: At this point we need to extract a TorClient
// (or something we can use like one!) from the `Arc<dyn
// Object> we have. We also need to extract something that
// we can use to register the DataStreamCtrl object once we
// have one.
let _ = session;
let _ = stream_id;
// TODO RPC: This is a placeholder; remove it!
self.tor_client.clone()
} else {
return Err(anyhow!("no rpc manager found!?"));
}
}
AI::IsolateStream(auth) => {
// Use the source address, SOCKS authentication, and listener ID
// to determine the stream's isolation properties. (Our current
// rule is that two streams may only share a circuit if they have
// the same values for all of these properties.)
prefs.set_isolation(SocksIsolationKey(conn_isolation, auth));
self.tor_client.clone()
}
};
Ok((prefs, tor_client))
}
}
/// Given a just-received TCP connection `S` on a SOCKS port, handle the
/// SOCKS handshake and relay the connection over the Tor network.
///
/// Uses `isolation_info` to decide which circuits this connection
/// may use. Requires that `isolation_info` is a pair listing the listener
/// id and the source address for the socks request.
async fn handle_socks_conn<R, S>(
runtime: R,
context: SocksConnContext<R>,
socks_stream: S,
isolation_info: ConnIsolation,
) -> Result<()>
where
R: Runtime,
S: AsyncRead + AsyncWrite + Send + Sync + Unpin + 'static,
{
// Part 1: Perform the SOCKS handshake, to learn where we are
// being asked to connect, and what we're being asked to do once
// we connect there.
//
// The SOCKS handshake can require multiple round trips (SOCKS5
// always does) so we we need to run this part of the process in a
// loop.
let mut handshake = tor_socksproto::SocksProxyHandshake::new();
let (mut socks_r, mut socks_w) = socks_stream.split();
let mut inbuf = [0_u8; 1024];
let mut n_read = 0;
let request = loop {
if n_read == inbuf.len() {
// We would like to read more of this SOCKS request, but there is no
// more space in the buffer. If we try to keep reading into an
// empty buffer, we'll just read nothing, try to parse it, and learn
// that we still wish we had more to read.
//
// In theory we might want to resize the buffer. Right now, though,
// we just reject handshakes that don't fit into 1k.
return Err(anyhow!("Socks handshake did not fit in 1KiB buffer"));
}
// Read some more stuff.
n_read += socks_r
.read(&mut inbuf[n_read..])
.await
.context("Error while reading SOCKS handshake")?;
// try to advance the handshake to the next state.
let action = match handshake.handshake(&inbuf[..n_read]) {
Err(_) => continue, // Message truncated.
Ok(Err(e)) => {
if let tor_socksproto::Error::BadProtocol(version) = e {
// check for HTTP methods: CONNECT, DELETE, GET, HEAD, OPTION, PUT, POST, PATCH and
// TRACE.
// To do so, check the first byte of the connection, which happen to be placed
// where SOCKs version field is.
if [b'C', b'D', b'G', b'H', b'O', b'P', b'T'].contains(&version) {
write_all_and_close(&mut socks_w, WRONG_PROTOCOL_PAYLOAD).await?;
}
}
// if there is an handshake error, don't reply with a Socks error, remote does not
// seems to speak Socks.
return Err(e.into());
}
Ok(Ok(action)) => action,
};
// reply if needed.
if action.drain > 0 {
inbuf.copy_within(action.drain..action.drain + n_read, 0);
n_read -= action.drain;
}
if !action.reply.is_empty() {
write_all_and_flush(&mut socks_w, &action.reply).await?;
}
if action.finished {
break handshake.into_request();
}
};
let request = match request {
Some(r) => r,
None => {
warn!("SOCKS handshake succeeded, but couldn't convert into a request.");
return Ok(());
}
};
// Unpack the socks request and find out where we're connecting to.
let addr = request.addr().to_string();
let port = request.port();
debug!(
"Got a socks request: {} {}:{}",
request.command(),
sensitive(&addr),
port
);
let (prefs, tor_client) = context.get_prefs_and_session(&request, &addr, isolation_info)?;
match request.command() {
SocksCmd::CONNECT => {
// The SOCKS request wants us to connect to a given address.
// So, launch a connection over Tor.
let tor_stream = tor_client
.connect_with_prefs((addr.clone(), port), &prefs)
.await;
let tor_stream = match tor_stream {
Ok(s) => s,
Err(e) => return reply_error(&mut socks_w, &request, e.kind()).await,
};
// Okay, great! We have a connection over the Tor network.
debug!("Got a stream for {}:{}", sensitive(&addr), port);
// Send back a SOCKS response, telling the client that it
// successfully connected.
let reply = request
.reply(tor_socksproto::SocksStatus::SUCCEEDED, None)
.context("Encoding socks reply")?;
write_all_and_flush(&mut socks_w, &reply[..]).await?;
let (tor_r, tor_w) = tor_stream.split();
// Finally, spawn two background tasks to relay traffic between
// the socks stream and the tor stream.
runtime.spawn(copy_interactive(socks_r, tor_w).map(|_| ()))?;
runtime.spawn(copy_interactive(tor_r, socks_w).map(|_| ()))?;
}
SocksCmd::RESOLVE => {
// We've been asked to perform a regular hostname lookup.
// (This is a tor-specific SOCKS extension.)
let addr = if let Ok(addr) = addr.parse() {
// if this is a valid ip address, just parse it and reply.
Ok(addr)
} else {
tor_client
.resolve_with_prefs(&addr, &prefs)
.await
.map_err(|e| e.kind())
.and_then(|addrs| addrs.first().copied().ok_or(ErrorKind::Other))
};
match addr {
Ok(addr) => {
let reply = request
.reply(
tor_socksproto::SocksStatus::SUCCEEDED,
Some(&SocksAddr::Ip(addr)),
)
.context("Encoding socks reply")?;
write_all_and_close(&mut socks_w, &reply[..]).await?;
}
Err(e) => return reply_error(&mut socks_w, &request, e).await,
}
}
SocksCmd::RESOLVE_PTR => {
// We've been asked to perform a reverse hostname lookup.
// (This is a tor-specific SOCKS extension.)
let addr: IpAddr = match addr.parse() {
Ok(ip) => ip,
Err(e) => {
let reply = request
.reply(tor_socksproto::SocksStatus::ADDRTYPE_NOT_SUPPORTED, None)
.context("Encoding socks reply")?;
write_all_and_close(&mut socks_w, &reply[..]).await?;
return Err(anyhow!(e));
}
};
let hosts = match tor_client.resolve_ptr_with_prefs(addr, &prefs).await {
Ok(hosts) => hosts,
Err(e) => return reply_error(&mut socks_w, &request, e.kind()).await,
};
if let Some(host) = hosts.into_iter().next() {
// this conversion should never fail, legal DNS names len must be <= 253 but Socks
// names can be up to 255 chars.
let hostname = SocksAddr::Hostname(host.try_into()?);
let reply = request
.reply(tor_socksproto::SocksStatus::SUCCEEDED, Some(&hostname))
.context("Encoding socks reply")?;
write_all_and_close(&mut socks_w, &reply[..]).await?;
}
}
_ => {
// We don't support this SOCKS command.
warn!("Dropping request; {:?} is unsupported", request.command());
let reply = request
.reply(tor_socksproto::SocksStatus::COMMAND_NOT_SUPPORTED, None)
.context("Encoding socks reply")?;
write_all_and_close(&mut socks_w, &reply[..]).await?;
}
};
// TODO: we should close the TCP stream if either task fails. Do we?
// See #211 and #190.
Ok(())
}
/// write_all the data to the writer & flush the writer if write_all is successful.
async fn write_all_and_flush<W>(writer: &mut W, buf: &[u8]) -> Result<()>
where
W: AsyncWrite + Unpin,
{
writer
.write_all(buf)
.await
.context("Error while writing SOCKS reply")?;
writer
.flush()
.await
.context("Error while flushing SOCKS stream")
}
/// write_all the data to the writer & close the writer if write_all is successful.
async fn write_all_and_close<W>(writer: &mut W, buf: &[u8]) -> Result<()>
where
W: AsyncWrite + Unpin,
{
writer
.write_all(buf)
.await
.context("Error while writing SOCKS reply")?;
writer
.close()
.await
.context("Error while closing SOCKS stream")
}
/// Reply a Socks error based on an arti-client Error and close the stream.
/// Returns the error provided in parameter
async fn reply_error<W>(
writer: &mut W,
request: &SocksRequest,
error: arti_client::ErrorKind,
) -> Result<()>
where
W: AsyncWrite + Unpin,
{
use {tor_socksproto::SocksStatus as S, ErrorKind as EK};
// TODO: Currently we _always_ try to return extended SOCKS return values
// for onion service failures from proposal 304 when they are appropriate.
// But according to prop 304, this is something we should only do when it's
// requested, for compatibility with SOCKS implementations that can't handle
// unexpected REP codes.
//
// I suggest we make these extended error codes "always-on" for now, and
// later add a feature to disable them if it's needed. -nickm
// TODO: Perhaps we should map the extended SOCKS return values for onion
// service failures unconditionally, even if we haven't compiled in onion
// service client support. We can make that change after the relevant
// ErrorKinds are no longer `experimental-api` in `tor-error`.
// We need to send an error. See what kind it is.
let status = match error {
EK::RemoteNetworkFailed => S::TTL_EXPIRED,
#[cfg(feature = "onion-service-client")]
EK::OnionServiceNotFound => S::HS_DESC_NOT_FOUND,
#[cfg(feature = "onion-service-client")]
EK::OnionServiceAddressInvalid => S::HS_BAD_ADDRESS,
#[cfg(feature = "onion-service-client")]
EK::OnionServiceMissingClientAuth => S::HS_MISSING_CLIENT_AUTH,
#[cfg(feature = "onion-service-client")]
EK::OnionServiceWrongClientAuth => S::HS_WRONG_CLIENT_AUTH,
// NOTE: This is not a perfect correspondence from these ErrorKinds to
// the errors we're returning here. In the longer run, we'll want to
// encourage other ways to indicate failure to clients. Those ways might
// include encouraging HTTP CONNECT, or the RPC system, both of which
// would give us more robust ways to report different kinds of failure.
#[cfg(feature = "onion-service-client")]
EK::OnionServiceNotRunning
| EK::OnionServiceConnectionFailed
| EK::OnionServiceProtocolViolation => S::HS_INTRO_FAILED,
_ => S::GENERAL_FAILURE,
};
let reply = request
.reply(status, None)
.context("Encoding socks reply")?;
// if writing back the error fail, still return the original error
let _ = write_all_and_close(writer, &reply[..]).await;
Err(anyhow!(error))
}
/// Copy all the data from `reader` into `writer` until we encounter an EOF or
/// an error.
///
/// Unlike as futures::io::copy(), this function is meant for use with
/// interactive readers and writers, where the reader might pause for
/// a while, but where we want to send data on the writer as soon as
/// it is available.
///
/// This function assumes that the writer might need to be flushed for
/// any buffered data to be sent. It tries to minimize the number of
/// flushes, however, by only flushing the writer when the reader has no data.
async fn copy_interactive<R, W>(mut reader: R, mut writer: W) -> IoResult<()>
where
R: AsyncRead + Unpin,
W: AsyncWrite + Unpin,
{
use futures::{poll, task::Poll};
let mut buf = [0_u8; 1024];
// At this point we could just loop, calling read().await,
// write_all().await, and flush().await. But we want to be more
// clever than that: we only want to flush when the reader is
// stalled. That way we can pack our data into as few cells as
// possible, but flush it immediately whenever there's no more
// data coming.
let loop_result: IoResult<()> = loop {
let mut read_future = reader.read(&mut buf[..]);
match poll!(&mut read_future) {
Poll::Ready(Err(e)) => break Err(e),
Poll::Ready(Ok(0)) => break Ok(()), // EOF
Poll::Ready(Ok(n)) => {
writer.write_all(&buf[..n]).await?;
continue;
}
Poll::Pending => writer.flush().await?,
}
// The read future is pending, so we should wait on it.
match read_future.await {
Err(e) => break Err(e),
Ok(0) => break Ok(()),
Ok(n) => writer.write_all(&buf[..n]).await?,
}
};
// Make sure that we flush any lingering data if we can.
//
// If there is a difference between closing and dropping, then we
// only want to do a "proper" close if the reader closed cleanly.
let flush_result = if loop_result.is_ok() {
writer.close().await
} else {
writer.flush().await
};
loop_result.or(flush_result)
}
/// Return true if a given IoError, when received from accept, is a fatal
/// error.
fn accept_err_is_fatal(err: &IoError) -> bool {
#![allow(clippy::match_like_matches_macro)]
/// Re-declaration of WSAEMFILE with the right type to match
/// `raw_os_error()`.
#[cfg(windows)]
const WSAEMFILE: i32 = winapi::shared::winerror::WSAEMFILE as i32;
// Currently, EMFILE and ENFILE aren't distinguished by ErrorKind;
// we need to use OS-specific errors. :P
match err.raw_os_error() {
#[cfg(unix)]
Some(libc::EMFILE) | Some(libc::ENFILE) => false,
#[cfg(windows)]
Some(WSAEMFILE) => false,
_ => true,
}
}
/// Launch a SOCKS proxy to listen on a given localhost port, and run
/// indefinitely.
///
/// Requires a `runtime` to use for launching tasks and handling
/// timeouts, and a `tor_client` to use in connecting over the Tor
/// network.
#[cfg_attr(feature = "experimental-api", visibility::make(pub))]
pub(crate) async fn run_socks_proxy<R: Runtime>(
runtime: R,
tor_client: TorClient<R>,
listen: Listen,
// TODO RPC: This is not a good way to make an API conditional. We MUST
// refactor this before the RPC feature becomes non-experimental.
#[cfg(feature = "rpc")] rpc_mgr: Option<Arc<arti_rpcserver::RpcMgr>>,
) -> Result<()> {
let mut listeners = Vec::new();
// Try to bind to the SOCKS ports.
match listen.ip_addrs() {
Ok(addrgroups) => {
for addrgroup in addrgroups {
for addr in addrgroup {
match runtime.listen(&addr).await {
Ok(listener) => {
info!("Listening on {:?}.", addr);
listeners.push(listener);
}
#[cfg(unix)]
Err(ref e) if e.raw_os_error() == Some(libc::EAFNOSUPPORT) => {
warn_report!(e, "Address family not supported {}", addr);
}
Err(ref e) => {
return Err(anyhow!("Can't listen on {}: {e}", addr));
}
}
}
}
}
Err(e) => warn_report!(e, "Invalid listen spec"),
}
// We weren't able to bind any ports: There's nothing to do.
if listeners.is_empty() {
error!("Couldn't open any SOCKS listeners.");
return Err(anyhow!("Couldn't open SOCKS listeners"));
}
// Create a stream of (incoming socket, listener_id) pairs, selected
// across all the listeners.
let mut incoming = futures::stream::select_all(
listeners
.into_iter()
.map(TcpListener::incoming)
.enumerate()
.map(|(listener_id, incoming_conns)| {
incoming_conns.map(move |socket| (socket, listener_id))
}),
);
// Loop over all incoming connections. For each one, call
// handle_socks_conn() in a new task.
while let Some((stream, sock_id)) = incoming.next().await {
let (stream, addr) = match stream {
Ok((s, a)) => (s, a),
Err(err) => {
if accept_err_is_fatal(&err) {
return Err(err).context("Failed to receive incoming stream on SOCKS port");
} else {
warn_report!(err, "Incoming stream failed");
continue;
}
}
};
let socks_context = SocksConnContext {
tor_client: tor_client.clone(),
#[cfg(feature = "rpc")]
rpc_mgr: rpc_mgr.clone(),
};
let runtime_copy = runtime.clone();
runtime.spawn(async move {
let res =
handle_socks_conn(runtime_copy, socks_context, stream, (sock_id, addr.ip())).await;
if let Err(e) = res {
// TODO: warn_report doesn't work on anyhow::Error.
warn!("connection exited with error: {}", tor_error::Report(e));
}
})?;
}
Ok(())
}