Hi - Great job on grpc. I have a quick question - I'm trying to obtain the 
CN (common name) field from the peer's TLS certificate within a 
(server-side) gRPC stub unsuccessfully. 

I've implemented a c++ grpc based TLS server and can successfully connect a 
client over TLS however I'd like to capture client specific details (that I 
write into the client's certificate) when a client's call arrives on the 
server side for tracking and key-ing data against. I see the first argument 
in a grpc server-side call is the ServerContext so I've tried to locate the 
common name as follows:

   - 
(ServerContext)->auth_context()->FindPropertyValues(GRPC_X509_CN_PROPERTY_NAME) 
   - empty
   - (ServerContext)->auth_context()->GetPeerIdentity() - empty
   - It's also not in the (ServerContext)->client_metadata()

I can obtain the value from openssl i.e. the CN field is set in the 
client's cert:

openssl x509 --noout -subject -in client_cert.pem.

How do I get the common name (and other client TLS fields) from the 
server-side rpc call (c++).

Many thanks in advance!

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