[C based] - Access TLS Server certificate on client side

[leguilly...@gmail.com]

Hi all, 

I tried gitter without luck so I am allowing myself to send my question here.

I am using grpc using TLS, and I would like to retrieve the server certificate on the client side (ideally in C#, but I am already trying to figure out if it is even feasible in C++). I managed to get the client certificate on the server side using the ServerCallContext, and I could find people discussing doing this in go (https://github.com/grpc/grpc-go/issues/1240) and Java (https://github.com/grpc/grpc-java/issues/4348) but could find nothing regarding the C based implementation, and digging through the code I am starting to think that there is simply no support for it at any level.

* Can somebody confirm this or point me to how it can be done?

* If it is impossible to do at the moment, would it be a big task to actually implement this access?

[Nicolas Noble]

In the C core, this is done using verify_peer_options

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[leguilly...@gmail.com]

Thank you very much for your answer, it looks like this is what I was after, I will dig into it.