Read peer certificate from SSL context

Mbed TLS
1

I have created a server with TLS and I need to read the certificate used by the client (the client code is also made by me). I have read that I can use the ssl.session->peer_cert object, but I get the message Certificate is uninitialised! when I use mbedtls_x509_crt_info. I have also defined the macro MBEDTLS_SSL_SSL_KEEP_PEER_CERTIFICATE.

Basically what I need is to validate the client certificate, check that the certificate issuer is trusted and the expiration date has not been reached or is close to being reached.

I am reading code and following breakponts in debugging, but if someone could shed some light I would appreciate it, I have just recently started with MbedTLS.

2

After hours of trial and error, I have learned a few things and have come to the conclusion that the approach I am taking in the question is not correct. Actually my client is not configured to send a leaf certificate, but a CA.

In Stack Overflow I have made the question in another way