.NET核心3是否支持TLS1.3

Question

我正在使用.NET Core3.0制作一个代理，它只支持TLS1.3，我看到Tls13 = 12288是在SslProtocols中定义的。但在我的测试中，它只抛出异常“客户端和服务器无法通信，因为它们没有通用的算法”。所以我的问题是.NET Core3.0现在是否支持TLS1.3？

我使用的是visual studio professional 2019 v16.3.0预览版3.0，我的项目是netcore3.0

Tls13 is defined in SslProtocols

//
// Summary:
//     Defines the possible versions of System.Security.Authentication.SslProtocols.
[Flags]
public enum SslProtocols {
    //
    // Summary:
    //     Allows the operating system to choose the best protocol to use, and to block
    //     protocols that are not secure. Unless your app has a specific reason not to,
    //     you should use this field.
    None = 0,
    //
    // Summary:
    //     Specifies the SSL 2.0 protocol. SSL 2.0 has been superseded by the TLS protocol
    //     and is provided for backward compatibility only.
    Ssl2 = 12,
    //
    // Summary:
    //     Specifies the SSL 3.0 protocol. SSL 3.0 has been superseded by the TLS protocol
    //     and is provided for backward compatibility only.
    Ssl3 = 48,
    //
    // Summary:
    //     Specifies the TLS 1.0 security protocol. The TLS protocol is defined in IETF
    //     RFC 2246.
    Tls = 192,
    //
    // Summary:
    //     Use None instead of Default. Default permits only the Secure Sockets Layer (SSL)
    //     3.0 or Transport Layer Security (TLS) 1.0 protocols to be negotiated, and those
    //     options are now considered obsolete. Consequently, Default is not allowed in
    //     many organizations. Despite the name of this field, System.Net.Security.SslStream
    //     does not use it as a default except under special circumstances.
    Default = 240,
    //
    // Summary:
    //     Specifies the TLS 1.1 security protocol. The TLS protocol is defined in IETF
    //     RFC 4346.
    Tls11 = 768,
    //
    // Summary:
    //     Specifies the TLS 1.2 security protocol. The TLS protocol is defined in IETF
    //     RFC 5246.
    Tls12 = 3072,
    //
    // Summary:
    //     Specifies the TLS 1.3 security protocol. The TLS protocol is defined in IETF
    //     RFC 8446.
    Tls13 = 12288
}

Answer 1

谷歌是你的朋友：

https://docs.microsoft.com/en-us/dotnet/core/whats-new/dotnet-core-3-0

.NET核心上的LinuxTLS1.3和OpenSSL 1.1.1现在利用了OpenSSL 1.1.1中的TLS1.3支持，当它在给定的环境中可用时。使用TLS 1.3：

通过减少客户端和服务器之间所需的往返行程，缩短了连接时间。由于删除了各种过时和不安全的加密算法，提高了安全性。当可用时，LinuxCore3.0在.NET系统上使用OpenSSL 1.1.1、OpenSSL 1.1.0或OpenSSL 1.0.2。当OpenSSL 1.1.1可用时，System.Net.Security.SslStream和System.Net.Http.HttpClient类型都将使用TLS1.3(假设客户端和服务器都支持TLS1.3)。