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use std::{ future::Future, io, mem::MaybeUninit, pin::Pin, sync::Arc, task::{Context, Poll}, }; use bytes::{Buf, BufMut}; use futures::future::{FutureExt, TryFutureExt}; use ring::digest; use rustls::{ClientConfig, Session}; use tokio::io::{AsyncRead, AsyncWrite}; use tokio_postgres::tls::{ChannelBinding, MakeTlsConnect, TlsConnect}; use tokio_rustls::{client::TlsStream, TlsConnector}; use webpki::{DNSName, DNSNameRef}; #[derive(Clone)] pub struct MakeRustlsConnect { config: Arc<ClientConfig>, } impl MakeRustlsConnect { pub fn new(config: ClientConfig) -> Self { Self { config: Arc::new(config), } } } impl<S> MakeTlsConnect<S> for MakeRustlsConnect where S: AsyncRead + AsyncWrite + Unpin + Send + 'static, { type Stream = RustlsStream<S>; type TlsConnect = RustlsConnect; type Error = io::Error; fn make_tls_connect(&mut self, hostname: &str) -> io::Result<RustlsConnect> { DNSNameRef::try_from_ascii_str(hostname) .map(|dns_name| RustlsConnect { hostname: dns_name.to_owned(), connector: Arc::clone(&self.config).into(), }) .map_err(|_| io::ErrorKind::InvalidInput.into()) } } pub struct RustlsConnect { hostname: DNSName, connector: TlsConnector, } impl<S> TlsConnect<S> for RustlsConnect where S: AsyncRead + AsyncWrite + Unpin + Send + 'static, { type Stream = RustlsStream<S>; type Error = io::Error; type Future = Pin<Box<dyn Future<Output = io::Result<RustlsStream<S>>> + Send>>; fn connect(self, stream: S) -> Self::Future { self.connector .connect(self.hostname.as_ref(), stream) .map_ok(|s| RustlsStream(Box::pin(s))) .boxed() } } pub struct RustlsStream<S>(Pin<Box<TlsStream<S>>>); impl<S> tokio_postgres::tls::TlsStream for RustlsStream<S> where S: AsyncRead + AsyncWrite + Unpin, { fn channel_binding(&self) -> ChannelBinding { let (_, session) = self.0.get_ref(); match session.get_peer_certificates() { Some(certs) if certs.len() > 0 => { let sha256 = digest::digest(&digest::SHA256, certs[0].as_ref()); ChannelBinding::tls_server_end_point(sha256.as_ref().into()) } _ => ChannelBinding::none(), } } } impl<S> AsyncRead for RustlsStream<S> where S: AsyncRead + AsyncWrite + Unpin, { fn poll_read( mut self: Pin<&mut Self>, cx: &mut Context, buf: &mut [u8], ) -> Poll<tokio::io::Result<usize>> { self.0.as_mut().poll_read(cx, buf) } unsafe fn prepare_uninitialized_buffer(&self, buf: &mut [MaybeUninit<u8>]) -> bool { self.0.prepare_uninitialized_buffer(buf) } fn poll_read_buf<B: BufMut>( mut self: Pin<&mut Self>, cx: &mut Context, buf: &mut B, ) -> Poll<tokio::io::Result<usize>> where Self: Sized, { self.0.as_mut().poll_read_buf(cx, buf) } } impl<S> AsyncWrite for RustlsStream<S> where S: AsyncRead + AsyncWrite + Unpin, { fn poll_write( mut self: Pin<&mut Self>, cx: &mut Context, buf: &[u8], ) -> Poll<tokio::io::Result<usize>> { self.0.as_mut().poll_write(cx, buf) } fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<tokio::io::Result<()>> { self.0.as_mut().poll_flush(cx) } fn poll_shutdown(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<tokio::io::Result<()>> { self.0.as_mut().poll_shutdown(cx) } fn poll_write_buf<B: Buf>( mut self: Pin<&mut Self>, cx: &mut Context, buf: &mut B, ) -> Poll<tokio::io::Result<usize>> where Self: Sized, { self.0.as_mut().poll_write_buf(cx, buf) } } #[cfg(test)] mod tests { use futures::future::TryFutureExt; #[tokio::test] async fn it_works() { env_logger::builder().is_test(true).try_init().unwrap(); let config = rustls::ClientConfig::new(); let tls = super::MakeRustlsConnect::new(config); let (client, conn) = tokio_postgres::connect("sslmode=require host=localhost user=postgres", tls) .await .expect("connect"); tokio::spawn(conn.map_err(|e| panic!("{:?}", e))); let stmt = client.prepare("SELECT 1").await.expect("prepare"); let _ = client.query(&stmt, &[]).await.expect("query"); } }