mORMot Open Source

squirrel

Member

Registered: 2015-08-13

Posts: 155

Using client certificates with TCrtSocket

When making a TLS tcp connection to a 3rd party server using TCrtSocket, the server requests a client certificate.  Valid certificates with client authentication key usage purposes are installed on the client's windows certificate store.  How do I provide these to the server over the standard tls tcp connection?

Last edited by squirrel (2020-08-04 07:56:43)

ab

Administrator

From: France

Registered: 2010-06-21

Posts: 14,656

Website

Re: Using client certificates with TCrtSocket

Do you want to transmit the certificates from client to the server? Public certicates?
You want to make client authentication, I guess.
If the client transmits its own certificates by itself, then I don't see any benefit. A third-party authentication service should transmit the certificate.

squirrel

Member

Registered: 2015-08-13

Posts: 155

Re: Using client certificates with TCrtSocket

This link describes it better than I can:
https://techcommunity.microsoft.com/t5/ … a-p/324623

"Client Certificate Authentication is a mutual certificate based authentication, where the client provides its Client Certificate to the Server to prove its identity. This happens as a part of the SSL Handshake"

I need to perform secure tcp communications to a 3rd party server where client certificate authentication is used and where the server is configured for this part to not be optional.

Last edited by squirrel (2020-08-04 09:31:16)

ab

Administrator

From: France

Registered: 2010-06-21

Posts: 14,656

Website

Re: Using client certificates with TCrtSocket

So the client public key should be recorded on the server side.
The client private key cannot be set with TCrtSock.

But it is allowed with TCurlHTTP - which requires libcurl.