410 lines
13 KiB
Rust
410 lines
13 KiB
Rust
//! Client Handler
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use std::net::SocketAddr;
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use std::sync::Arc;
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use std::time::Duration;
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use tokio::io::{AsyncRead, AsyncReadExt, AsyncWrite};
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use tokio::net::TcpStream;
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use tokio::time::timeout;
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use tracing::{debug, warn};
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use crate::config::ProxyConfig;
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use crate::crypto::SecureRandom;
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use crate::error::{HandshakeResult, ProxyError, Result};
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use crate::ip_tracker::UserIpTracker;
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use crate::protocol::constants::*;
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use crate::protocol::tls;
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use crate::stats::{ReplayChecker, Stats};
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use crate::stream::{BufferPool, CryptoReader, CryptoWriter};
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use crate::transport::middle_proxy::MePool;
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use crate::transport::{UpstreamManager, configure_client_socket};
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use crate::proxy::direct_relay::handle_via_direct;
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use crate::proxy::handshake::{HandshakeSuccess, handle_mtproto_handshake, handle_tls_handshake};
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use crate::proxy::masking::handle_bad_client;
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use crate::proxy::middle_relay::handle_via_middle_proxy;
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pub struct ClientHandler;
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pub struct RunningClientHandler {
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stream: TcpStream,
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peer: SocketAddr,
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config: Arc<ProxyConfig>,
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stats: Arc<Stats>,
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replay_checker: Arc<ReplayChecker>,
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upstream_manager: Arc<UpstreamManager>,
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buffer_pool: Arc<BufferPool>,
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rng: Arc<SecureRandom>,
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me_pool: Option<Arc<MePool>>,
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ip_tracker: Arc<UserIpTracker>,
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}
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impl ClientHandler {
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pub fn new(
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stream: TcpStream,
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peer: SocketAddr,
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config: Arc<ProxyConfig>,
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stats: Arc<Stats>,
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upstream_manager: Arc<UpstreamManager>,
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replay_checker: Arc<ReplayChecker>,
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buffer_pool: Arc<BufferPool>,
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rng: Arc<SecureRandom>,
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me_pool: Option<Arc<MePool>>,
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ip_tracker: Arc<UserIpTracker>,
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) -> RunningClientHandler {
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RunningClientHandler {
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stream,
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peer,
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config,
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stats,
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replay_checker,
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upstream_manager,
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buffer_pool,
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rng,
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me_pool,
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ip_tracker,
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}
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}
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}
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impl RunningClientHandler {
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pub async fn run(mut self) -> Result<()> {
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self.stats.increment_connects_all();
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let peer = self.peer;
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debug!(peer = %peer, "New connection");
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if let Err(e) = configure_client_socket(
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&self.stream,
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self.config.timeouts.client_keepalive,
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self.config.timeouts.client_ack,
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) {
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debug!(peer = %peer, error = %e, "Failed to configure client socket");
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}
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let handshake_timeout = Duration::from_secs(self.config.timeouts.client_handshake);
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let stats = self.stats.clone();
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let result = timeout(handshake_timeout, self.do_handshake()).await;
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match result {
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Ok(Ok(())) => {
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debug!(peer = %peer, "Connection handled successfully");
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Ok(())
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}
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Ok(Err(e)) => {
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debug!(peer = %peer, error = %e, "Handshake failed");
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Err(e)
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}
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Err(_) => {
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stats.increment_handshake_timeouts();
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debug!(peer = %peer, "Handshake timeout");
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Err(ProxyError::TgHandshakeTimeout)
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}
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}
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}
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async fn do_handshake(mut self) -> Result<()> {
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let mut first_bytes = [0u8; 5];
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self.stream.read_exact(&mut first_bytes).await?;
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let is_tls = tls::is_tls_handshake(&first_bytes[..3]);
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let peer = self.peer;
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debug!(peer = %peer, is_tls = is_tls, "Handshake type detected");
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if is_tls {
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self.handle_tls_client(first_bytes).await
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} else {
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self.handle_direct_client(first_bytes).await
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}
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}
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async fn handle_tls_client(mut self, first_bytes: [u8; 5]) -> Result<()> {
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let peer = self.peer;
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let tls_len = u16::from_be_bytes([first_bytes[3], first_bytes[4]]) as usize;
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debug!(peer = %peer, tls_len = tls_len, "Reading TLS handshake");
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if tls_len < 512 {
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debug!(peer = %peer, tls_len = tls_len, "TLS handshake too short");
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self.stats.increment_connects_bad();
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let (reader, writer) = self.stream.into_split();
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handle_bad_client(reader, writer, &first_bytes, &self.config).await;
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return Ok(());
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}
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let mut handshake = vec![0u8; 5 + tls_len];
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handshake[..5].copy_from_slice(&first_bytes);
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self.stream.read_exact(&mut handshake[5..]).await?;
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let config = self.config.clone();
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let replay_checker = self.replay_checker.clone();
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let stats = self.stats.clone();
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let buffer_pool = self.buffer_pool.clone();
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let local_addr = self.stream.local_addr().map_err(ProxyError::Io)?;
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let (read_half, write_half) = self.stream.into_split();
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let (mut tls_reader, tls_writer, _tls_user) = match handle_tls_handshake(
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&handshake,
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read_half,
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write_half,
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peer,
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&config,
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&replay_checker,
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&self.rng,
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)
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.await
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{
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HandshakeResult::Success(result) => result,
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HandshakeResult::BadClient { reader, writer } => {
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stats.increment_connects_bad();
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handle_bad_client(reader, writer, &handshake, &config).await;
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return Ok(());
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}
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HandshakeResult::Error(e) => return Err(e),
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};
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debug!(peer = %peer, "Reading MTProto handshake through TLS");
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let mtproto_data = tls_reader.read_exact(HANDSHAKE_LEN).await?;
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let mtproto_handshake: [u8; HANDSHAKE_LEN] = mtproto_data[..]
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.try_into()
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.map_err(|_| ProxyError::InvalidHandshake("Short MTProto handshake".into()))?;
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let (crypto_reader, crypto_writer, success) = match handle_mtproto_handshake(
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&mtproto_handshake,
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tls_reader,
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tls_writer,
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peer,
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&config,
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&replay_checker,
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true,
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)
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.await
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{
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HandshakeResult::Success(result) => result,
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HandshakeResult::BadClient {
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reader: _,
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writer: _,
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} => {
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stats.increment_connects_bad();
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debug!(peer = %peer, "Valid TLS but invalid MTProto handshake");
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return Ok(());
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}
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HandshakeResult::Error(e) => return Err(e),
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};
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Self::handle_authenticated_static(
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crypto_reader,
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crypto_writer,
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success,
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self.upstream_manager,
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self.stats,
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self.config,
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buffer_pool,
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self.rng,
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self.me_pool,
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local_addr,
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peer,
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self.ip_tracker,
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)
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.await
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}
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async fn handle_direct_client(mut self, first_bytes: [u8; 5]) -> Result<()> {
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let peer = self.peer;
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if !self.config.general.modes.classic && !self.config.general.modes.secure {
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debug!(peer = %peer, "Non-TLS modes disabled");
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self.stats.increment_connects_bad();
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let (reader, writer) = self.stream.into_split();
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handle_bad_client(reader, writer, &first_bytes, &self.config).await;
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return Ok(());
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}
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let mut handshake = [0u8; HANDSHAKE_LEN];
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handshake[..5].copy_from_slice(&first_bytes);
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self.stream.read_exact(&mut handshake[5..]).await?;
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let config = self.config.clone();
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let replay_checker = self.replay_checker.clone();
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let stats = self.stats.clone();
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let buffer_pool = self.buffer_pool.clone();
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let local_addr = self.stream.local_addr().map_err(ProxyError::Io)?;
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let (read_half, write_half) = self.stream.into_split();
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let (crypto_reader, crypto_writer, success) = match handle_mtproto_handshake(
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&handshake,
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read_half,
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write_half,
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peer,
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&config,
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&replay_checker,
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false,
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)
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.await
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{
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HandshakeResult::Success(result) => result,
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HandshakeResult::BadClient { reader, writer } => {
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stats.increment_connects_bad();
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handle_bad_client(reader, writer, &handshake, &config).await;
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return Ok(());
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}
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HandshakeResult::Error(e) => return Err(e),
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};
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Self::handle_authenticated_static(
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crypto_reader,
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crypto_writer,
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success,
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self.upstream_manager,
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self.stats,
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self.config,
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buffer_pool,
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self.rng,
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self.me_pool,
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local_addr,
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peer,
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self.ip_tracker,
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)
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.await
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}
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/// Main dispatch after successful handshake.
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/// Two modes:
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/// - Direct: TCP relay to TG DC (existing behavior)
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/// - Middle Proxy: RPC multiplex through ME pool (new — supports CDN DCs)
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async fn handle_authenticated_static<R, W>(
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client_reader: CryptoReader<R>,
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client_writer: CryptoWriter<W>,
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success: HandshakeSuccess,
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upstream_manager: Arc<UpstreamManager>,
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stats: Arc<Stats>,
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config: Arc<ProxyConfig>,
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buffer_pool: Arc<BufferPool>,
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rng: Arc<SecureRandom>,
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me_pool: Option<Arc<MePool>>,
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local_addr: SocketAddr,
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peer_addr: SocketAddr,
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ip_tracker: Arc<UserIpTracker>,
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) -> Result<()>
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where
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R: AsyncRead + Unpin + Send + 'static,
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W: AsyncWrite + Unpin + Send + 'static,
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{
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let user = &success.user;
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if let Err(e) = Self::check_user_limits_static(user, &config, &stats, peer_addr, &ip_tracker).await {
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warn!(user = %user, error = %e, "User limit exceeded");
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return Err(e);
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}
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// IP Cleanup Guard: автоматически удаляет IP при выходе из scope
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struct IpCleanupGuard {
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tracker: Arc<UserIpTracker>,
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user: String,
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ip: std::net::IpAddr,
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}
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impl Drop for IpCleanupGuard {
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fn drop(&mut self) {
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let tracker = self.tracker.clone();
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let user = self.user.clone();
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let ip = self.ip;
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tokio::spawn(async move {
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tracker.remove_ip(&user, ip).await;
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debug!(user = %user, ip = %ip, "IP cleaned up on disconnect");
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});
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}
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}
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let _cleanup = IpCleanupGuard {
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tracker: ip_tracker,
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user: user.clone(),
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ip: peer_addr.ip(),
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};
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// Decide: middle proxy or direct
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if config.general.use_middle_proxy {
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if let Some(ref pool) = me_pool {
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return handle_via_middle_proxy(
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client_reader,
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client_writer,
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success,
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pool.clone(),
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stats,
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config,
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buffer_pool,
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local_addr,
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rng,
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)
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.await;
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}
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warn!("use_middle_proxy=true but MePool not initialized, falling back to direct");
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}
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// Direct mode (original behavior)
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handle_via_direct(
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client_reader,
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client_writer,
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success,
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upstream_manager,
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stats,
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config,
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buffer_pool,
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rng,
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)
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.await
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}
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async fn check_user_limits_static(
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user: &str,
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config: &ProxyConfig,
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stats: &Stats,
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peer_addr: SocketAddr,
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ip_tracker: &UserIpTracker,
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) -> Result<()> {
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if let Some(expiration) = config.access.user_expirations.get(user) {
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if chrono::Utc::now() > *expiration {
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return Err(ProxyError::UserExpired {
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user: user.to_string(),
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});
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}
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}
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// IP limit check
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if let Err(reason) = ip_tracker.check_and_add(user, peer_addr.ip()).await {
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warn!(
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user = %user,
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ip = %peer_addr.ip(),
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reason = %reason,
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"IP limit exceeded"
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);
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return Err(ProxyError::ConnectionLimitExceeded {
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user: user.to_string(),
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});
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}
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if let Some(limit) = config.access.user_max_tcp_conns.get(user) {
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if stats.get_user_curr_connects(user) >= *limit as u64 {
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return Err(ProxyError::ConnectionLimitExceeded {
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user: user.to_string(),
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});
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}
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}
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if let Some(quota) = config.access.user_data_quota.get(user) {
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if stats.get_user_total_octets(user) >= *quota {
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return Err(ProxyError::DataQuotaExceeded {
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user: user.to_string(),
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});
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}
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}
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Ok(())
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}
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}
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