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
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
//! Asynchronous TLS/SSL streams for Tokio using [Rustls](https://github.com/ctz/rustls).

pub extern crate rustls;
pub extern crate webpki;

extern crate bytes;
extern crate futures;
extern crate iovec;
extern crate tokio_io;

pub mod client;
mod common;
pub mod server;

use common::Stream;
use futures::{Async, Future, Poll};
use rustls::{ClientConfig, ClientSession, ServerConfig, ServerSession, Session};
use std::sync::Arc;
use std::{io, mem};
use tokio_io::{try_nb, AsyncRead, AsyncWrite};
use webpki::DNSNameRef;

#[derive(Debug, Copy, Clone)]
pub enum TlsState {
    #[cfg(feature = "early-data")]
    EarlyData,
    Stream,
    ReadShutdown,
    WriteShutdown,
    FullyShutdown,
}

impl TlsState {
    pub(crate) fn shutdown_read(&mut self) {
        match *self {
            TlsState::WriteShutdown | TlsState::FullyShutdown => *self = TlsState::FullyShutdown,
            _ => *self = TlsState::ReadShutdown,
        }
    }

    pub(crate) fn shutdown_write(&mut self) {
        match *self {
            TlsState::ReadShutdown | TlsState::FullyShutdown => *self = TlsState::FullyShutdown,
            _ => *self = TlsState::WriteShutdown,
        }
    }

    pub(crate) fn writeable(&self) -> bool {
        match *self {
            TlsState::WriteShutdown | TlsState::FullyShutdown => false,
            _ => true,
        }
    }

    pub(crate) fn readable(self) -> bool {
        match self {
            TlsState::ReadShutdown | TlsState::FullyShutdown => false,
            _ => true,
        }
    }
}

/// A wrapper around a `rustls::ClientConfig`, providing an async `connect` method.
#[derive(Clone)]
pub struct TlsConnector {
    inner: Arc<ClientConfig>,
    #[cfg(feature = "early-data")]
    early_data: bool,
}

/// A wrapper around a `rustls::ServerConfig`, providing an async `accept` method.
#[derive(Clone)]
pub struct TlsAcceptor {
    inner: Arc<ServerConfig>,
}

impl From<Arc<ClientConfig>> for TlsConnector {
    fn from(inner: Arc<ClientConfig>) -> TlsConnector {
        TlsConnector {
            inner,
            #[cfg(feature = "early-data")]
            early_data: false,
        }
    }
}

impl From<Arc<ServerConfig>> for TlsAcceptor {
    fn from(inner: Arc<ServerConfig>) -> TlsAcceptor {
        TlsAcceptor { inner }
    }
}

impl TlsConnector {
    /// Enable 0-RTT.
    ///
    /// Note that you want to use 0-RTT.
    /// You must set `enable_early_data` to `true` in `ClientConfig`.
    #[cfg(feature = "early-data")]
    pub fn early_data(mut self, flag: bool) -> TlsConnector {
        self.early_data = flag;
        self
    }

    pub fn connect<IO>(&self, domain: DNSNameRef, stream: IO) -> Connect<IO>
    where
        IO: AsyncRead + AsyncWrite,
    {
        self.connect_with(domain, stream, |_| ())
    }

    #[inline]
    pub fn connect_with<IO, F>(&self, domain: DNSNameRef, stream: IO, f: F) -> Connect<IO>
    where
        IO: AsyncRead + AsyncWrite,
        F: FnOnce(&mut ClientSession),
    {
        let mut session = ClientSession::new(&self.inner, domain);
        f(&mut session);

        #[cfg(not(feature = "early-data"))]
        {
            Connect(client::MidHandshake::Handshaking(client::TlsStream {
                session,
                io: stream,
                state: TlsState::Stream,
            }))
        }

        #[cfg(feature = "early-data")]
        {
            Connect(if self.early_data {
                client::MidHandshake::EarlyData(client::TlsStream {
                    session,
                    io: stream,
                    state: TlsState::EarlyData,
                    early_data: (0, Vec::new()),
                })
            } else {
                client::MidHandshake::Handshaking(client::TlsStream {
                    session,
                    io: stream,
                    state: TlsState::Stream,
                    early_data: (0, Vec::new()),
                })
            })
        }
    }
}

impl TlsAcceptor {
    pub fn accept<IO>(&self, stream: IO) -> Accept<IO>
    where
        IO: AsyncRead + AsyncWrite,
    {
        self.accept_with(stream, |_| ())
    }

    #[inline]
    pub fn accept_with<IO, F>(&self, stream: IO, f: F) -> Accept<IO>
    where
        IO: AsyncRead + AsyncWrite,
        F: FnOnce(&mut ServerSession),
    {
        let mut session = ServerSession::new(&self.inner);
        f(&mut session);

        Accept(server::MidHandshake::Handshaking(server::TlsStream {
            session,
            io: stream,
            state: TlsState::Stream,
        }))
    }
}

/// Future returned from `ClientConfigExt::connect_async` which will resolve
/// once the connection handshake has finished.
pub struct Connect<IO>(client::MidHandshake<IO>);

/// Future returned from `ServerConfigExt::accept_async` which will resolve
/// once the accept handshake has finished.
pub struct Accept<IO>(server::MidHandshake<IO>);

impl<IO> Connect<IO> {
    pub fn take_inner(&mut self) -> Option<IO> {
        match mem::replace(&mut self.0, client::MidHandshake::End) {
            client::MidHandshake::Handshaking(client::TlsStream { io, .. }) => Some(io),
            _ => None
        }
    }
}

impl<IO> Accept<IO> {
    pub fn take_inner(&mut self) -> Option<IO> {
        match mem::replace(&mut self.0, server::MidHandshake::End) {
            server::MidHandshake::Handshaking(server::TlsStream { io, .. }) => Some(io),
            _ => None
        }
    }
}

impl<IO: AsyncRead + AsyncWrite> Future for Connect<IO> {
    type Item = client::TlsStream<IO>;
    type Error = io::Error;

    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
        self.0.poll()
    }
}

impl<IO: AsyncRead + AsyncWrite> Future for Accept<IO> {
    type Item = server::TlsStream<IO>;
    type Error = io::Error;

    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
        self.0.poll()
    }
}

/// Unified TLS stream type
///
/// This abstracts over the inner `client::TlsStream` and `server::TlsStream`, so you can use
/// a single type to keep both client- and server-initiated TLS-encrypted connections.
pub enum TlsStream<T> {
    Client(client::TlsStream<T>),
    Server(server::TlsStream<T>),
}

impl<T> TlsStream<T> {
    pub fn get_ref(&self) -> (&T, &dyn Session) {
        use TlsStream::*;
        match self {
            Client(io) => {
                let (io, session) = io.get_ref();
                (io, &*session)
            }
            Server(io) => {
                let (io, session) = io.get_ref();
                (io, &*session)
            }
        }
    }

    pub fn get_mut(&mut self) -> (&mut T, &mut dyn Session) {
        use TlsStream::*;
        match self {
            Client(io) => {
                let (io, session) = io.get_mut();
                (io, &mut *session)
            }
            Server(io) => {
                let (io, session) = io.get_mut();
                (io, &mut *session)
            }
        }
    }
}

impl<T> From<client::TlsStream<T>> for TlsStream<T> {
    fn from(s: client::TlsStream<T>) -> Self {
        Self::Client(s)
    }
}

impl<T> From<server::TlsStream<T>> for TlsStream<T> {
    fn from(s: server::TlsStream<T>) -> Self {
        Self::Server(s)
    }
}

impl<T> io::Read for TlsStream<T>
where
    T: AsyncRead + AsyncWrite + io::Read,
{
    fn read(&mut self, buf: &mut [u8]) -> Result<usize, io::Error> {
        use TlsStream::*;
        match self {
            Client(io) => io.read(buf),
            Server(io) => io.read(buf),
        }
    }
}

impl<T> io::Write for TlsStream<T>
where
    T: AsyncRead + AsyncWrite + io::Write,
{
    fn write(&mut self, buf: &[u8]) -> Result<usize, io::Error> {
        use TlsStream::*;
        match self {
            Client(io) => io.write(buf),
            Server(io) => io.write(buf),
        }
    }

    fn flush(&mut self) -> Result<(), io::Error> {
        use TlsStream::*;
        match self {
            Client(io) => io.flush(),
            Server(io) => io.flush(),
        }
    }
}

impl<T> AsyncRead for TlsStream<T> where T: AsyncRead + AsyncWrite {}

impl<T> AsyncWrite for TlsStream<T>
where
    T: AsyncRead + AsyncWrite,
{
    fn shutdown(&mut self) -> Poll<(), io::Error> {
        use TlsStream::*;
        match self {
            Client(io) => io.shutdown(),
            Server(io) => io.shutdown(),
        }
    }
}