Client certificate tutorial

[JamesNK]

A tutorial showing the client using a client certificate and the server correctly validating it.

Tutorial should use ASP.NET Core's upcoming client cert validation middleware. See dotnet/aspnetcore#4663

[andradf]

Will we be able to use a X509Certificate2 with a non-exportable private key for client authentication with this version of grpc? This is a giant roadblock for us with the current grpc native implementation.

[JamesNK]

I am not an expert when it comes to certs, so I'm not sure.

What I can tell you is the .NET server side and client side gRPC auth support will be similar to what is possible now with HttpClient + Kestrel. If you can do it today with HttpClient and ASP.NET Core MVC then you will be able to do it with managed gRPC client and gRPC ASP.NET Core.

[JamesNK]

I have added a example of sending a client certificate with gRPC calls and using them on the server. It is available here - #306

This uses the new gRPC client that will be available in preview 6 very soon.