tls_peer_cert_subject
const char *tls_peer_cert_subject(struct tls *_ctx);
if (tls_peer_cert_subject(tls_ctx))
tls_peer_cert_subject(tls_ctx));
tls_peer_cert_subject(clt->clt_tls_ctx) != NULL &&
stravis(&user, tls_peer_cert_subject(clt->clt_tls_ctx),