Fix SSL_VERIFY_CLIENT_ONCE
The flag SSL_VERIFY_CLIENT_ONCE is documented as follows: B<Server mode:> only request a client certificate on the initial TLS/SSL handshake. Do not ask for a client certificate again in case of a renegotiation. This flag must be used together with SSL_VERIFY_PEER. B<Client mode:> ignored But the implementation actually did nothing. After the server sends its ServerKeyExchange message, the code was checking s->session->peer to see if it is NULL. If it was set then it did not ask for another client certificate. However s->session->peer will only be set in the event of a resumption, but a ServerKeyExchange message is only sent in the event of a full handshake (i.e. no resumption). The documentation suggests that the original intention was for this to have an effect on renegotiation, and resumption doesn't come into it. The fix is to properly check for renegotiation, not whether there is already a client certificate in the session. As far as I can tell this has been broken for a *long* time. Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/1982)
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