Add an SChannel TlsStream implementation

Closes #214

Cargo.toml

@@ -27,6 +27,7 @@ with-eui48 = ["eui48"]
 with-openssl = ["openssl"]
 with-native-tls = ["native-tls"]
 with-rustc-serialize = ["rustc-serialize"]
+with-schannel = ["schannel"]
 with-security-framework = ["security-framework"]
 with-serde_json = ["serde_json"]
 with-time = ["time"]
@@ -47,6 +48,7 @@ eui48 = { version = "0.1", optional = true }
 openssl = { version = "0.9", optional = true }
 native-tls = { version = "0.1", optional = true }
 rustc-serialize = { version = "0.3", optional = true }
+schannel = { version = "0.1", optional = true }
 security-framework = { version = "0.1.2", optional = true }
 serde_json = { version = ">= 0.6, < 0.9", optional = true }
 time = { version = "0.1.14", optional = true }

src/lib.rs

@@ -43,9 +43,9 @@
 //!
 //! This crate supports TLS secured connections. The `TlsMode` enum is passed to connection methods
 //! and indicates if the connection will not, may, or must be secured by TLS. The TLS implementation
-//! is pluggable through the `TlsHandshake` trait. Implementations for OpenSSL and OSX's Secure
-//! Transport are provided behind the `with-openssl`, `with-security-framework`, and
-//! `with-native-tls` feature flags respectively.
+//! is pluggable through the `TlsHandshake` trait. Implementations for OpenSSL, Secure Transport,
+//! SChannel, and the `native-tls` crate are provided behind the `with-openssl`,
+//! `with-security-framework`, `with-schannel`, and `with-native-tls` feature flags respectively.
 //!
 //! ## Examples
 //!

src/tls/mod.rs

@@ -5,12 +5,14 @@ use std::error::Error;
 use std::io::prelude::*;
 use std::fmt;
 
-#[cfg(feature = "with-openssl")]
-pub mod openssl;
-#[cfg(feature = "with-security-framework")]
-pub mod security_framework;
 #[cfg(feature = "with-native-tls")]
 pub mod native_tls;
+#[cfg(feature = "with-openssl")]
+pub mod openssl;
+#[cfg(feature = "with-schannel")]
+pub mod schannel;
+#[cfg(feature = "with-security-framework")]
+pub mod security_framework;
 
 /// A trait implemented by TLS streams.
 pub trait TlsStream: fmt::Debug + Read + Write + Send {

src/tls/schannel.rs

@@ -0,0 +1,51 @@
+//! SChannel support.
+
+extern crate schannel;
+
+use std::error::Error;
+use std::fmt;
+
+use self::schannel::schannel_cred::{SchannelCred, Direction};
+use self::schannel::tls_stream;
+use tls::{TlsStream, Stream, TlsHandshake};
+
+impl TlsStream for tls_stream::TlsStream<Stream> {
+    fn get_ref(&self) -> &Stream {
+        self.get_ref()
+    }
+
+    fn get_mut(&mut self) -> &mut Stream {
+        self.get_mut()
+    }
+}
+
+/// A `TlsHandshake` implementation that uses the `schannel` crate.
+///
+/// Requires the `with-schannel` feature.
+pub struct Schannel(());
+
+impl fmt::Debug for Schannel {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        fmt.debug_struct("Schannel").finish()
+    }
+}
+
+impl Schannel {
+    /// Constructs a new `SChannel` with a default configuration.
+    pub fn new() -> Schannel {
+        Schannel(())
+    }
+}
+
+impl TlsHandshake for Schannel {
+    fn tls_handshake(&self,
+                     host: &str,
+                     stream: Stream)
+                     -> Result<Box<TlsStream>, Box<Error + Sync + Send>> {
+        let creds = try!(SchannelCred::builder().acquire(Direction::Outbound));
+        let stream = try!(tls_stream::Builder::new()
+            .domain(host)
+            .connect(creds, stream));
+        Ok(Box::new(stream))
+    }
+}