我发现的一件事是，从客户端可以运行

One thing I found was that from the client, you can run status to determine if the current connection is using ssl. Not sure if there's a way to do it for a specific user though.

克里斯·怀特(Chris White)的解决方案( MySQL:要求SSL未显示在赠款中)适用于特定用户

Chris White's solution(MySQL: REQUIRE SSL not shown in grants) works for a specific user