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

use std::fmt;
use std::io;
use std::sync::Arc;

use futures::{Future, Poll};
use hyper::client::{Connect, HttpConnector};
use hyper::Uri;
use native_tls::TlsConnector;
pub use native_tls::Error;
use tokio_core::reactor::Handle;
use tokio_service::Service;
use tokio_tls::TlsConnectorExt;

use stream::MaybeHttpsStream;

/// A Connector for the `https` scheme.
#[derive(Clone)]
pub struct HttpsConnector<T> {
    hostname_verification: bool,
    http: T,
    tls: Arc<TlsConnector>,
}

impl HttpsConnector<HttpConnector> {

    /// Construct a new HttpsConnector.
    ///
    /// Takes number of DNS worker threads.
    ///
    /// This uses hyper's default `HttpConnector`, and default `TlsConnector`.
    /// If you wish to use something besides the defaults, use `From::from`.
    pub fn new(threads: usize, handle: &Handle) -> Result<Self, Error> {
        let mut http = HttpConnector::new(threads, handle);
        http.enforce_http(false);
        let tls = TlsConnector::builder()?.build()?;
        Ok(HttpsConnector::from((http, tls)))
    }
}

impl<T> HttpsConnector<T> where T: Connect {
    /// Disable hostname verification when connecting.
    ///
    /// # Warning
    ///
    /// You should think very carefully before you use this method. If hostname
    /// verification is not used, any valid certificate for any site will be
    /// trusted for use from any other. This introduces a significant
    /// vulnerability to man-in-the-middle attacks.
    pub fn danger_disable_hostname_verification(&mut self, disable: bool) {
        self.hostname_verification = !disable;
    }
}

impl<T> From<(T, TlsConnector)> for HttpsConnector<T> {
    fn from(args: (T, TlsConnector)) -> HttpsConnector<T> {
        HttpsConnector {
            hostname_verification: true,
            http: args.0,
            tls: Arc::new(args.1),
        }
    }
}

impl<T> fmt::Debug for HttpsConnector<T> {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.debug_struct("HttpsConnector")
            .finish()
    }
}

impl<T: Connect> Service for HttpsConnector<T> {
    type Request = Uri;
    type Response = MaybeHttpsStream<T::Output>;
    type Error = io::Error;
    type Future = HttpsConnecting<T::Output>;

    fn call(&self, uri: Uri) -> Self::Future {
        let is_https = uri.scheme() == Some("https");
        let host = match uri.host() {
            Some(host) => host.to_owned(),
            None => return HttpsConnecting(
                Box::new(
                    ::futures::future::err(
                        io::Error::new(
                            io::ErrorKind::InvalidInput,
                            "invalid url, missing host"
                        )
                    )
                )
            ),
        };
        let connecting = self.http.connect(uri);
        let tls = self.tls.clone();
        let verification = self.hostname_verification;

        let fut: BoxedFut<T::Output> = if is_https {
            let fut = connecting.and_then(move |tcp| {
                let handshake = if verification {
                    tls.connect_async(&host, tcp)
                } else {
                    tls.danger_connect_async_without_providing_domain_for_certificate_verification_and_server_name_indication(tcp)
                };
                handshake
                    .map(|conn| MaybeHttpsStream::Https(conn))
                    .map_err(|e| io::Error::new(io::ErrorKind::Other, e))
            });
            Box::new(fut)
        } else {
            Box::new(connecting.map(|tcp| MaybeHttpsStream::Http(tcp)))
        };
        HttpsConnecting(fut)
    }

}

type BoxedFut<T> = Box<Future<Item=MaybeHttpsStream<T>, Error=io::Error>>;

/// A Future representing work to connect to a URL, and a TLS handshake.
pub struct HttpsConnecting<T>(BoxedFut<T>);


impl<T> Future for HttpsConnecting<T> {
    type Item = MaybeHttpsStream<T>;
    type Error = io::Error;

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

impl<T> fmt::Debug for HttpsConnecting<T> {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.pad("HttpsConnecting")
    }
}