1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166

use std::io::{self, Read, Write};
use std::marker::Unpin;
use std::pin::Pin;
use std::ptr::null_mut;
use std::task::{Context, Poll};

use crate::runtime::{AsyncRead, AsyncWrite};
use crate::std_adapter::StdAdapter;

/// A stream managing a TLS session.
///
/// A wrapper around an underlying raw stream which implements the TLS or SSL
/// protocol.
///
/// A `TlsStream<S>` represents a handshake that has been completed successfully
/// and both the server and the client are ready for receiving and sending
/// data. Bytes read from a `TlsStream` are decrypted from `S` and bytes written
/// to a `TlsStream` are encrypted when passing through to `S`.
#[derive(Debug)]
pub struct TlsStream<S>(native_tls::TlsStream<StdAdapter<S>>);

impl<S> TlsStream<S> {
    pub(crate) fn new(stream: native_tls::TlsStream<StdAdapter<S>>) -> Self {
        Self(stream)
    }
    fn with_context<F, R>(&mut self, ctx: &mut Context<'_>, f: F) -> R
    where
        F: FnOnce(&mut native_tls::TlsStream<StdAdapter<S>>) -> R,
        StdAdapter<S>: Read + Write,
    {
        self.0.get_mut().context = ctx as *mut _ as *mut ();
        let g = Guard(self);
        f(&mut (g.0).0)
    }

    /// Returns a shared reference to the inner stream.
    pub fn get_ref(&self) -> &S
    where
        S: AsyncRead + AsyncWrite + Unpin,
    {
        &self.0.get_ref().inner
    }

    /// Returns a mutable reference to the inner stream.
    pub fn get_mut(&mut self) -> &mut S
    where
        S: AsyncRead + AsyncWrite + Unpin,
    {
        &mut self.0.get_mut().inner
    }

    /// Returns the number of bytes that can be read without resulting in any network calls.
    pub fn buffered_read_size(&self) -> crate::Result<usize>
    where
        S: AsyncRead + AsyncWrite + Unpin,
    {
        self.0.buffered_read_size()
    }

    /// Returns the peer's leaf certificate, if available.
    pub fn peer_certificate(&self) -> crate::Result<Option<crate::Certificate>>
    where
        S: AsyncRead + AsyncWrite + Unpin,
    {
        self.0.peer_certificate()
    }

    /// Returns the tls-server-end-point channel binding data as defined in [RFC 5929](https://tools.ietf.org/html/rfc5929).
    pub fn tls_server_end_point(&self) -> crate::Result<Option<Vec<u8>>>
    where
        S: AsyncRead + AsyncWrite + Unpin,
    {
        self.0.tls_server_end_point()
    }
}

#[cfg(feature = "runtime-async-std")]
impl<S> AsyncRead for TlsStream<S>
where
    S: AsyncRead + AsyncWrite + Unpin,
{
    fn poll_read(
        mut self: Pin<&mut Self>,
        ctx: &mut Context<'_>,
        buf: &mut [u8],
    ) -> Poll<io::Result<usize>> {
        self.with_context(ctx, |s| cvt(s.read(buf)))
    }
}

#[cfg(feature = "runtime-tokio")]
impl<S> AsyncRead for TlsStream<S>
where
    S: AsyncRead + AsyncWrite + Unpin,
{
    fn poll_read(
        mut self: Pin<&mut Self>,
        ctx: &mut Context<'_>,
        buf: &mut tokio::io::ReadBuf<'_>,
    ) -> Poll<io::Result<()>> {
        match self.with_context(ctx, |s| cvt(s.read(buf.initialize_unfilled()))) {
            Poll::Ready(Ok(len)) => {
                buf.advance(len);
                Poll::Ready(Ok(()))
            }
            Poll::Ready(Err(err)) => Poll::Ready(Err(err)),
            Poll::Pending => Poll::Pending,
        }
    }
}

impl<S> AsyncWrite for TlsStream<S>
where
    S: AsyncRead + AsyncWrite + Unpin,
{
    fn poll_write(
        mut self: Pin<&mut Self>,
        ctx: &mut Context<'_>,
        buf: &[u8],
    ) -> Poll<io::Result<usize>> {
        self.with_context(ctx, |s| cvt(s.write(buf)))
    }

    fn poll_flush(mut self: Pin<&mut Self>, ctx: &mut Context<'_>) -> Poll<io::Result<()>> {
        self.with_context(ctx, |s| cvt(s.flush()))
    }

    #[cfg(feature = "runtime-async-std")]
    fn poll_close(mut self: Pin<&mut Self>, ctx: &mut Context<'_>) -> Poll<io::Result<()>> {
        match self.with_context(ctx, |s| s.shutdown()) {
            Ok(()) => Poll::Ready(Ok(())),
            Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => Poll::Pending,
            Err(e) => Poll::Ready(Err(e)),
        }
    }

    #[cfg(feature = "runtime-tokio")]
    fn poll_shutdown(mut self: Pin<&mut Self>, ctx: &mut Context<'_>) -> Poll<io::Result<()>> {
        match self.with_context(ctx, |s| s.shutdown()) {
            Ok(()) => Poll::Ready(Ok(())),
            Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => Poll::Pending,
            Err(e) => Poll::Ready(Err(e)),
        }
    }
}

struct Guard<'a, S>(&'a mut TlsStream<S>)
where
    StdAdapter<S>: Read + Write;

impl<S> Drop for Guard<'_, S>
where
    StdAdapter<S>: Read + Write,
{
    fn drop(&mut self) {
        (self.0).0.get_mut().context = null_mut();
    }
}

fn cvt<T>(r: io::Result<T>) -> Poll<io::Result<T>> {
    match r {
        Ok(v) => Poll::Ready(Ok(v)),
        Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => Poll::Pending,
        Err(e) => Poll::Ready(Err(e)),
    }
}