Support TLS 1.3?

[driftluo]

I observed that openssl already supports TLS 1.3, security-framework does not support TLS 1.3 and native-tls does not currently support it：
https://github.com/sfackler/rust-openssl/blob/master/openssl/src/ssl/mod.rs#L587
https://github.com/kornelski/rust-security-framework/blob/master/security-framework/src/secure_transport.rs#L383-L419

rust-native-tls/src/lib.rs

Lines 311 to 327 in 7d34900

	pub enum Protocol {
	/// The SSL 3.0 protocol.
	///
	/// # Warning
	///
	/// SSL 3.0 has severe security flaws, and should not be used unless absolutely necessary. If
	/// you are not sure if you need to enable this protocol, you should not.
	Sslv3,
	/// The TLS 1.0 protocol.
	Tlsv10,
	/// The TLS 1.1 protocol.
	Tlsv11,
	/// The TLS 1.2 protocol.
	Tlsv12,
	#[doc(hidden)]
	__NonExhaustive,
	}

When is this work scheduled to start and finish? has a plan?

[sfackler]

It may be challenging to make sure a proper error is produced if the user sets the min version to 1.3 when using the schannel or security-framework backends that don't even know about that version.

[driftluo]

As you might expect, I actually want to lock on tls 1.3, don't support for lower versions.

emmm... it looks like a good idea, but just openssl/libressl/boringssl support it :(

[mehcode]

TLS 1.3 is supported on macOS 10.14+ and iOS 12.2+ and since about mid-2019 on Windows 10.

retep998/winapi-rs#859

kornelski/rust-security-framework#93

[jedisct1]

Now that macOS and Windows have had support for TLS 1.3 for a while, is it something native_tls could allow?

More and more servers are now only accepting TLS 1.3.

[guytbk]

Hey, is there any update on these? Is there intention to support tls1.3?

[roguh]

Also looking for any updates.