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
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
//! An abstraction over platform-specific TLS implementations.
//!
//! Many applications require TLS/SSL communication in one form or another as
//! part of their implementation, but finding a library for this isn't always
//! trivial! The purpose of this crate is to provide a seamless integration
//! experience on all platforms with a cross-platform API that deals with all
//! the underlying details for you.
//!
//! ```toml
//! # Cargo.toml
//! [dependencies]
//! native-tls = "0.1"
//! ```
//!
//! # How is this implemented?
//!
//! This crate uses SChannel on Windows (via the `schannel` crate), Secure
//! Transport on OSX (via the `security-framework` crate), and OpenSSL (via the
//! `openssl` crate) on all other platforms. Future futures may also enable
//! other TLS frameworks as well, but these initial libraries are likely to
//! remain as the defaults.
//!
//! If you know you're on a particular platform then you can use the
//! platform-specific extension traits in this crate to configure the underlying
//! details of that platform. For example OpenSSL may have more options for
//! configuration than Secure Transport. By default, though, the API of this
//! crate works across all platforms.
//!
//! Note that this crate also strives to be secure-by-default. For example when
//! using OpenSSL it will configure validation callbacks to ensure that
//! hostnames match certificates, use strong ciphers, etc. This implies that
//! this crate is *not* just a thin abstraction around the underlying libraries,
//! but also an implementation that strives to strike reasonable defaults.
//!
//! # Supported features
//!
//! This crate supports the following features out of the box:
//!
//! * TLS/SSL client communication
//! * TLS/SSL server communication
//! * PKCS#12 encoded server identities
//! * Secure-by-default for client and server
//!     * Includes hostname verification for clients
//! * Supports asynchronous I/O for both the server and the client
//!
//! Each implementation may support more features which can be accessed through
//! the extension traits in the `backend` module.
//!
//! # Examples
//!
//! To connect as a client to a remote server:
//!
//! ```rust
//! use native_tls::TlsConnector;
//! use std::io::{Read, Write};
//! use std::net::TcpStream;
//!
//! let connector = TlsConnector::builder().unwrap().build().unwrap();
//!
//! let stream = TcpStream::connect("google.com:443").unwrap();
//! let mut stream = connector.connect("google.com", stream).unwrap();
//!
//! stream.write_all(b"GET / HTTP/1.0\r\n\r\n").unwrap();
//! let mut res = vec![];
//! stream.read_to_end(&mut res).unwrap();
//! println!("{}", String::from_utf8_lossy(&res));
//! ```
//!
//! To accept connections as a server from remote clients:
//!
//! ```rust,no_run
//! use native_tls::{Pkcs12, TlsAcceptor, TlsStream};
//! use std::fs::File;
//! use std::io::{Read};
//! use std::net::{TcpListener, TcpStream};
//! use std::sync::Arc;
//! use std::thread;
//!
//! let mut file = File::open("identity.pfx").unwrap();
//! let mut pkcs12 = vec![];
//! file.read_to_end(&mut pkcs12).unwrap();
//! let pkcs12 = Pkcs12::from_der(&pkcs12, "hunter2").unwrap();
//!
//! let listener = TcpListener::bind("0.0.0.0:8443").unwrap();
//! let acceptor = TlsAcceptor::builder(pkcs12).unwrap().build().unwrap();
//! let acceptor = Arc::new(acceptor);
//!
//! fn handle_client(stream: TlsStream<TcpStream>) {
//!     // ...
//! }
//!
//! for stream in listener.incoming() {
//!     match stream {
//!         Ok(stream) => {
//!             let acceptor = acceptor.clone();
//!             thread::spawn(move || {
//!                 let stream = acceptor.accept(stream).unwrap();
//!                 handle_client(stream);
//!             });
//!         }
//!         Err(e) => { /* connection failed */ }
//!     }
//! }
//! ```
#![doc(html_root_url="https://sfackler.github.io/rust-native-tls/doc/v0.1.0")]
#![warn(missing_docs)]

#[cfg(test)]
extern crate openssl;

use std::any::Any;
use std::error;
use std::error::Error as StdError;
use std::io;
use std::fmt;
use std::result;

pub mod backend;

#[cfg(target_os = "macos")]
#[path = "imp/security_framework.rs"]
mod imp;
#[cfg(target_os = "windows")]
#[path = "imp/schannel.rs"]
mod imp;
#[cfg(not(any(target_os = "macos", target_os = "windows")))]
#[path = "imp/openssl.rs"]
mod imp;

#[cfg(test)]
mod test;

/// A typedef of the result type returned by many methods.
pub type Result<T> = result::Result<T, Error>;

/// An error returned from the TLS implementation.
pub struct Error(imp::Error);

impl error::Error for Error {
    fn description(&self) -> &str {
        error::Error::description(&self.0)
    }

    fn cause(&self) -> Option<&error::Error> {
        error::Error::cause(&self.0)
    }
}

impl fmt::Display for Error {
    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
        fmt::Display::fmt(&self.0, fmt)
    }
}

impl fmt::Debug for Error {
    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
        fmt::Debug::fmt(&self.0, fmt)
    }
}

impl From<imp::Error> for Error {
    fn from(err: imp::Error) -> Error {
        Error(err)
    }
}

/// A PKCS #12 archive.
pub struct Pkcs12(imp::Pkcs12);

impl Pkcs12 {
    /// Parses a DER-formatted PKCS #12 archive, using the specified password to decrypt the key.
    ///
    /// The archive should contain a leaf certificate and its private key, as well any intermediate
    /// certificates that should be sent to clients to allow them to build a chain to a trusted
    /// root. The chain certificates should be in order from the leaf certificate towards the root.
    ///
    /// PKCS #12 archives typically have the file extension `.p12` or `.pfx`, and can be created
    /// with the OpenSSL `pkcs12` tool:
    ///
    /// ```bash
    /// openssl pkcs12 -export -out identity.pfx -inkey key.pem -in cert.pem -certfile chain_certs.pem
    /// ```
    pub fn from_der(der: &[u8], password: &str) -> Result<Pkcs12> {
        let pkcs12 = try!(imp::Pkcs12::from_der(der, password));
        Ok(Pkcs12(pkcs12))
    }
}

/// A TLS stream which has been interrupted midway through the handshake process.
pub struct MidHandshakeTlsStream<S>(imp::MidHandshakeTlsStream<S>);

impl<S> fmt::Debug for MidHandshakeTlsStream<S>
    where S: fmt::Debug
{
    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
        fmt::Debug::fmt(&self.0, fmt)
    }
}

impl<S> MidHandshakeTlsStream<S>
    where S: io::Read + io::Write
{
    /// Returns a shared reference to the inner stream.
    pub fn get_ref(&self) -> &S {
        self.0.get_ref()
    }

    /// Returns a mutable reference to the inner stream.
    pub fn get_mut(&mut self) -> &mut S {
        self.0.get_mut()
    }

    /// Restarts the handshake process.
    ///
    /// If the handshake completes successfully then the negotiated stream is
    /// returned. If there is a problem, however, then an error is returned.
    /// Note that the error may not be fatal. For example if the underlying
    /// stream is an asynchronous one then `HandshakeError::Interrupted` may
    /// just mean to wait for more I/O to happen later.
    pub fn handshake(self) -> result::Result<TlsStream<S>, HandshakeError<S>> {
        match self.0.handshake() {
            Ok(s) => Ok(TlsStream(s)),
            Err(e) => Err(e.into()),
        }
    }
}

/// An error returned from `ClientBuilder::handshake`.
#[derive(Debug)]
pub enum HandshakeError<S> {
    /// A fatal error.
    Failure(Error),

    /// A stream interrupted midway through the handshake process due to a
    /// `WouldBlock` error.
    ///
    /// Note that this is not a fatal error and it should be safe to call
    /// `handshake` at a later time once the stream is ready to perform I/O
    /// again.
    Interrupted(MidHandshakeTlsStream<S>),
}

impl<S> error::Error for HandshakeError<S>
    where S: Any + fmt::Debug
{
    fn description(&self) -> &str {
        match *self {
            HandshakeError::Failure(ref e) => e.description(),
            HandshakeError::Interrupted(_) => "the handshake process was interrupted",
        }
    }

    fn cause(&self) -> Option<&error::Error> {
        match *self {
            HandshakeError::Failure(ref e) => Some(e),
            HandshakeError::Interrupted(_) => None,
        }
    }
}

impl<S> fmt::Display for HandshakeError<S>
    where S: Any + fmt::Debug
{
    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
        try!(fmt.write_str(self.description()));
        if let Some(cause) = self.cause() {
            try!(write!(fmt, ": {}", cause));
        }
        Ok(())
    }
}

impl<S> From<imp::HandshakeError<S>> for HandshakeError<S> {
    fn from(e: imp::HandshakeError<S>) -> HandshakeError<S> {
        match e {
            imp::HandshakeError::Failure(e) => HandshakeError::Failure(Error(e)),
            imp::HandshakeError::Interrupted(s) => {
                HandshakeError::Interrupted(MidHandshakeTlsStream(s))
            }
        }
    }
}

/// A builder for `TlsConnector`s.
pub struct TlsConnectorBuilder(imp::TlsConnectorBuilder);

impl TlsConnectorBuilder {
    /// Sets the identity to be used for client certificate authentication.
    pub fn identity(&mut self, pkcs12: Pkcs12) -> Result<&mut TlsConnectorBuilder> {
        try!(self.0.identity(pkcs12.0));
        Ok(self)
    }

    /// Consumes the builder, returning a `TlsConnector`.
    pub fn build(self) -> Result<TlsConnector> {
        let connector = try!(self.0.build());
        Ok(TlsConnector(connector))
    }
}

/// A builder for client-side TLS connections.
///
/// # Examples
///
/// ```rust
/// use native_tls::TlsConnector;
/// use std::io::{Read, Write};
/// use std::net::TcpStream;
///
/// let connector = TlsConnector::builder().unwrap().build().unwrap();
///
/// let stream = TcpStream::connect("google.com:443").unwrap();
/// let mut stream = connector.connect("google.com", stream).unwrap();
///
/// stream.write_all(b"GET / HTTP/1.0\r\n\r\n").unwrap();
/// let mut res = vec![];
/// stream.read_to_end(&mut res).unwrap();
/// println!("{}", String::from_utf8_lossy(&res));
/// ```
pub struct TlsConnector(imp::TlsConnector);

impl TlsConnector {
    /// Returns a new builder for a `TlsConnector`.
    pub fn builder() -> Result<TlsConnectorBuilder> {
        let builder = try!(imp::TlsConnector::builder());
        Ok(TlsConnectorBuilder(builder))
    }

    /// Initiates a TLS handshake.
    ///
    /// The provided domain will be used for both SNI and certificate hostname
    /// validation.
    ///
    /// If the socket is nonblocking and a `WouldBlock` error is returned during
    /// the handshake, a `HandshakeError::Interrupted` error will be returned
    /// which can be used to restart the handshake when the socket is ready
    /// again.
    pub fn connect<S>(&self,
                      domain: &str,
                      stream: S)
                      -> result::Result<TlsStream<S>, HandshakeError<S>>
        where S: io::Read + io::Write
    {
        let s = try!(self.0.connect(domain, stream));
        Ok(TlsStream(s))
    }
}

/// A builder for `TlsAcceptor`s.
pub struct TlsAcceptorBuilder(imp::TlsAcceptorBuilder);

impl TlsAcceptorBuilder {
    /// Consumes the builder, returning a `TlsAcceptor`.
    pub fn build(self) -> Result<TlsAcceptor> {
        let acceptor = try!(self.0.build());
        Ok(TlsAcceptor(acceptor))
    }
}

/// A builder for server-side TLS connections.
///
/// # Examples
///
/// ```rust,no_run
/// use native_tls::{Pkcs12, TlsAcceptor, TlsStream};
/// use std::fs::File;
/// use std::io::{Read};
/// use std::net::{TcpListener, TcpStream};
/// use std::sync::Arc;
/// use std::thread;
///
/// let mut file = File::open("identity.pfx").unwrap();
/// let mut pkcs12 = vec![];
/// file.read_to_end(&mut pkcs12).unwrap();
/// let pkcs12 = Pkcs12::from_der(&pkcs12, "hunter2").unwrap();
///
/// let listener = TcpListener::bind("0.0.0.0:8443").unwrap();
/// let acceptor = TlsAcceptor::builder(pkcs12).unwrap().build().unwrap();
/// let acceptor = Arc::new(acceptor);
///
/// fn handle_client(stream: TlsStream<TcpStream>) {
///     // ...
/// }
///
/// for stream in listener.incoming() {
///     match stream {
///         Ok(stream) => {
///             let acceptor = acceptor.clone();
///             thread::spawn(move || {
///                 let stream = acceptor.accept(stream).unwrap();
///                 handle_client(stream);
///             });
///         }
///         Err(e) => { /* connection failed */ }
///     }
/// }
/// ```
pub struct TlsAcceptor(imp::TlsAcceptor);

impl TlsAcceptor {
    /// Returns a new builder for a `TlsAcceptor`.
    ///
    /// This builder is created with a key/certificate pair in the `pkcs12`
    /// archived passed in. The returned builder will use that key/certificate
    /// to send to clients which it connects to.
    pub fn builder(pkcs12: Pkcs12) -> Result<TlsAcceptorBuilder> {
        let builder = try!(imp::TlsAcceptor::builder(pkcs12.0));
        Ok(TlsAcceptorBuilder(builder))
    }

    /// Initiates a TLS handshake.
    ///
    /// If the socket is nonblocking and a `WouldBlock` error is returned during
    /// the handshake, a `HandshakeError::Interrupted` error will be returned
    /// which can be used to restart the handshake when the socket is ready
    /// again.
    pub fn accept<S>(&self, stream: S) -> result::Result<TlsStream<S>, HandshakeError<S>>
        where S: io::Read + io::Write
    {
        match self.0.accept(stream) {
            Ok(s) => Ok(TlsStream(s)),
            Err(e) => Err(e.into()),
        }
    }
}

/// A stream managing a TLS session.
pub struct TlsStream<S>(imp::TlsStream<S>);

impl<S: fmt::Debug> fmt::Debug for TlsStream<S> {
    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
        fmt::Debug::fmt(&self.0, fmt)
    }
}

impl<S: io::Read + io::Write> TlsStream<S> {
    /// Returns a shared reference to the inner stream.
    pub fn get_ref(&self) -> &S {
        self.0.get_ref()
    }

    /// Returns a mutable reference to the inner stream.
    pub fn get_mut(&mut self) -> &mut S {
        self.0.get_mut()
    }

    /// Returns the number of bytes that can be read without resulting in any
    /// network calls.
    pub fn buffered_read_size(&self) -> Result<usize> {
        Ok(try!(self.0.buffered_read_size()))
    }
}

impl<S: io::Read + io::Write> io::Read for TlsStream<S> {
    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
        self.0.read(buf)
    }
}

impl<S: io::Read + io::Write> io::Write for TlsStream<S> {
    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
        self.0.write(buf)
    }

    fn flush(&mut self) -> io::Result<()> {
        self.0.flush()
    }
}

fn _check_kinds() {
    use std::net::TcpStream;

    fn is_sync<T: Sync>() {}
    fn is_send<T: Send>() {}
    is_sync::<Error>();
    is_send::<Error>();
    is_sync::<TlsConnectorBuilder>();
    is_send::<TlsConnectorBuilder>();
    is_sync::<TlsConnector>();
    is_send::<TlsConnector>();
    is_sync::<TlsAcceptorBuilder>();
    is_send::<TlsAcceptorBuilder>();
    is_sync::<TlsAcceptor>();
    is_send::<TlsAcceptor>();
    is_sync::<TlsStream<TcpStream>>();
    is_send::<TlsStream<TcpStream>>();
    is_sync::<MidHandshakeTlsStream<TcpStream>>();
    is_send::<MidHandshakeTlsStream<TcpStream>>();
}