Use WinAPI for SSL on Windows

[retep998]

As an alternative to OpenSSL (which is generally quite annoying to build on Windows), it would be nice if Hyper had the option to use methods that WinAPI provides for SSL instead.

Bindings to the relevant WinAPI methods will be provided by me https://github.com/retep998/winapi-rs

Will use the abstraction provided by #577

Related repos:
https://github.com/steffengy/rust-schannel

Relevant links:
Authentication Functions
Using SSPI with a Windows Socket Client
Creating a Secure Connection Using Schannel
Secure Channel
SSPI with Schannel example

[steffengy]

Now also available through https://crates.io/crates/schannel

[luser]

In #755, someone linked to https://github.com/sfackler/rust-native-tls, which is a crate wrapping openssl/security-framework/schannel, which might be a good way to go in the future.

[p-jackson]

Created a gist that shows how to get schannel working with hyper, just incase someone encounters this thread while looking for that info.
https://gist.github.com/p-jackson/198dd5de05b53d14b533d272f2eaefce

schannel needs an update before it'll work with hyper 0.9

[steffengy]

@p-jackson
Be aware that it very likely won't work that way anymore for any future version.

rust-native-tls as a wrapper in the future will be nice though.

[nshtg]

Are there any plans to integrate rust-native-tls using a special feature flag? Easy usage of hyper without openssl would be really exciting!

[sinhpham]

What is blocking this issue? I may find some time to work on this, however I'm not familiar with the code base. Can someone give me an overview of what needs to be done and what potential obstacles there are?

[seanmonstar]

This is waiting on the development of https://github.com/sfackler/rust-native-tls. It looks like releases are happening in the past couple days, but there were bad bugs until then.

[Diggsey]

rustup has been using native-tls as the default on windows for a while now. Are there any outstanding bugs that are blocking this?

[seanmonstar]

Probably not, other than all focus is on master, using async IO (and thus probably something like tokio-tls).

[Arnavion]

I think this can be closed now?

[seanmonstar]

Ah correct! TLS is no longer in hyper, see #985 for details.