1.0.0
Tschuss Status Quo - Hallo, Zukunft!
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Alexey
277
src/stream/tls_stream.rs
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277
src/stream/tls_stream.rs
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//! Fake TLS 1.3 stream wrappers
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use bytes::{Bytes, BytesMut};
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use std::io::{Error, ErrorKind, Result};
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use std::pin::Pin;
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use std::task::{Context, Poll};
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use tokio::io::{AsyncRead, AsyncWrite, AsyncReadExt, AsyncWriteExt, ReadBuf};
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use crate::protocol::constants::{
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TLS_VERSION, TLS_RECORD_APPLICATION, TLS_RECORD_CHANGE_CIPHER,
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MAX_TLS_CHUNK_SIZE,
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};
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use parking_lot::Mutex;
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/// Reader that unwraps TLS 1.3 records
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pub struct FakeTlsReader<R> {
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upstream: R,
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buffer: BytesMut,
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pending_read: Option<PendingTlsRead>,
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}
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struct PendingTlsRead {
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record_type: u8,
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remaining: usize,
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}
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impl<R> FakeTlsReader<R> {
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/// Create new fake TLS reader
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pub fn new(upstream: R) -> Self {
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Self {
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upstream,
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buffer: BytesMut::with_capacity(16384),
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pending_read: None,
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}
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}
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/// Get reference to upstream
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pub fn get_ref(&self) -> &R {
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&self.upstream
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}
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/// Get mutable reference to upstream
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pub fn get_mut(&mut self) -> &mut R {
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&mut self.upstream
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}
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/// Consume and return upstream
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pub fn into_inner(self) -> R {
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self.upstream
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}
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}
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impl<R: AsyncRead + Unpin> FakeTlsReader<R> {
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/// Read exactly n bytes through TLS layer
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pub async fn read_exact(&mut self, n: usize) -> Result<Bytes> {
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while self.buffer.len() < n {
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let data = self.read_tls_record().await?;
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if data.is_empty() {
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return Err(Error::new(ErrorKind::UnexpectedEof, "Connection closed"));
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}
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self.buffer.extend_from_slice(&data);
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}
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Ok(self.buffer.split_to(n).freeze())
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}
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/// Read a single TLS record
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async fn read_tls_record(&mut self) -> Result<Vec<u8>> {
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loop {
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// Read TLS record header (5 bytes)
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let mut header = [0u8; 5];
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self.upstream.read_exact(&mut header).await?;
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let record_type = header[0];
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let version = [header[1], header[2]];
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let length = u16::from_be_bytes([header[3], header[4]]) as usize;
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// Validate version
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if version != TLS_VERSION {
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return Err(Error::new(
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ErrorKind::InvalidData,
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format!("Invalid TLS version: {:02x?}", version),
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));
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}
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// Read record body
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let mut data = vec![0u8; length];
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self.upstream.read_exact(&mut data).await?;
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match record_type {
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TLS_RECORD_CHANGE_CIPHER => continue, // Skip
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TLS_RECORD_APPLICATION => return Ok(data),
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_ => {
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return Err(Error::new(
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ErrorKind::InvalidData,
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format!("Unexpected TLS record type: 0x{:02x}", record_type),
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));
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}
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}
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}
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}
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}
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impl<R: AsyncRead + Unpin> AsyncRead for FakeTlsReader<R> {
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fn poll_read(
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mut self: Pin<&mut Self>,
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cx: &mut Context<'_>,
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buf: &mut ReadBuf<'_>,
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) -> Poll<Result<()>> {
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// Drain buffer first
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if !self.buffer.is_empty() {
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let to_copy = self.buffer.len().min(buf.remaining());
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buf.put_slice(&self.buffer.split_to(to_copy));
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return Poll::Ready(Ok(()));
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}
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// We need to read a TLS record, but poll_read doesn't support async/await
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// So we'll do a simplified version that reads header synchronously
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// Read header
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let mut header = [0u8; 5];
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let mut header_buf = ReadBuf::new(&mut header);
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match Pin::new(&mut self.upstream).poll_read(cx, &mut header_buf) {
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Poll::Ready(Ok(())) => {
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if header_buf.filled().len() < 5 {
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// Need more data - store what we have and return pending
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// For simplicity, we'll just return empty
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return Poll::Ready(Ok(()));
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}
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}
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Poll::Ready(Err(e)) => return Poll::Ready(Err(e)),
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Poll::Pending => return Poll::Pending,
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}
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let record_type = header[0];
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let length = u16::from_be_bytes([header[3], header[4]]) as usize;
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if record_type == TLS_RECORD_CHANGE_CIPHER {
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// Skip this record, try again
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cx.waker().wake_by_ref();
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return Poll::Pending;
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}
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if record_type != TLS_RECORD_APPLICATION {
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return Poll::Ready(Err(Error::new(
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ErrorKind::InvalidData,
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"Invalid TLS record type",
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)));
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}
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// Read body
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let mut body = vec![0u8; length];
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let mut body_buf = ReadBuf::new(&mut body);
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match Pin::new(&mut self.upstream).poll_read(cx, &mut body_buf) {
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Poll::Ready(Ok(())) => {
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let filled = body_buf.filled();
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let to_copy = filled.len().min(buf.remaining());
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buf.put_slice(&filled[..to_copy]);
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if filled.len() > to_copy {
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self.buffer.extend_from_slice(&filled[to_copy..]);
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}
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Poll::Ready(Ok(()))
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}
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Poll::Ready(Err(e)) => Poll::Ready(Err(e)),
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Poll::Pending => Poll::Pending,
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}
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}
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}
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/// Writer that wraps data in TLS 1.3 records
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pub struct FakeTlsWriter<W> {
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upstream: W,
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}
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impl<W> FakeTlsWriter<W> {
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/// Create new fake TLS writer
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pub fn new(upstream: W) -> Self {
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Self { upstream }
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}
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/// Get reference to upstream
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pub fn get_ref(&self) -> &W {
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&self.upstream
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}
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/// Get mutable reference to upstream
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pub fn get_mut(&mut self) -> &mut W {
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&mut self.upstream
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}
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/// Consume and return upstream
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pub fn into_inner(self) -> W {
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self.upstream
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}
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}
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impl<W: AsyncWrite + Unpin> AsyncWrite for FakeTlsWriter<W> {
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fn poll_write(
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mut self: Pin<&mut Self>,
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cx: &mut Context<'_>,
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buf: &[u8],
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) -> Poll<Result<usize>> {
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// Build TLS record
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let chunk_size = buf.len().min(MAX_TLS_CHUNK_SIZE);
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let chunk = &buf[..chunk_size];
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let mut record = Vec::with_capacity(5 + chunk_size);
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record.push(TLS_RECORD_APPLICATION);
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record.extend_from_slice(&TLS_VERSION);
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record.push((chunk_size >> 8) as u8);
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record.push(chunk_size as u8);
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record.extend_from_slice(chunk);
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match Pin::new(&mut self.upstream).poll_write(cx, &record) {
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Poll::Ready(Ok(written)) => {
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if written >= 5 {
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Poll::Ready(Ok(written - 5))
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} else {
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Poll::Ready(Ok(0))
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}
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}
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Poll::Ready(Err(e)) => Poll::Ready(Err(e)),
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Poll::Pending => Poll::Pending,
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}
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}
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fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<()>> {
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Pin::new(&mut self.upstream).poll_flush(cx)
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}
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fn poll_shutdown(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<()>> {
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Pin::new(&mut self.upstream).poll_shutdown(cx)
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}
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}
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impl<W: AsyncWrite + Unpin> FakeTlsWriter<W> {
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/// Write all data wrapped in TLS records (async method)
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pub async fn write_all_tls(&mut self, data: &[u8]) -> Result<()> {
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for chunk in data.chunks(MAX_TLS_CHUNK_SIZE) {
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let header = [
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TLS_RECORD_APPLICATION,
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TLS_VERSION[0],
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TLS_VERSION[1],
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(chunk.len() >> 8) as u8,
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chunk.len() as u8,
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];
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self.upstream.write_all(&header).await?;
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self.upstream.write_all(chunk).await?;
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}
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Ok(())
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use tokio::io::duplex;
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#[tokio::test]
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async fn test_tls_stream_roundtrip() {
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let (client, server) = duplex(4096);
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let mut writer = FakeTlsWriter::new(client);
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let mut reader = FakeTlsReader::new(server);
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let original = b"Hello, fake TLS!";
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writer.write_all_tls(original).await.unwrap();
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writer.flush().await.unwrap();
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let received = reader.read_exact(original.len()).await.unwrap();
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assert_eq!(&received[..], original);
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}
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}
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