Add SSL configuration

[deemo021211]

Add SSL configuration, which can be more secure

[sfc9982]

AnyConnect/OpenConnect itself is actually a SSLVPN.

[deemo021211]

AnyConnect/OpenConnect本身实际上是一个SSLVPN。 What I mean is to bind the domain name so that the TLS1.3 protocol can be used.

[deemo021211]

AnyConnect/OpenConnect本身实际上是一个SSLVPN。

tls1.3 is more secure than tls1.2.

[sfc9982]

AnyConnect/OpenConnect本身实际上是一个SSLVPN。

tls1.3 is more secure than tls1.2.

OpenConnect 的客户端和服务端是支持 TLS 1.3 的，如果你连接有问题的话。可能是配置文件和你服务端环境的问题。

参考：

• https://github.com/cernekee/ics-openconnect/issues/66

[sfc9982]

参考 ocserv.conf 中的 tls-priorities 等配置项