If our server channel creates its own qrx, set its initial secret
With the addition of larger client hellos, stemming from the use of
larger PQC key shares, it may happen that we get a client hello accross
multiple datagrams. Normally this is not a problem as
port_default_packet_handler allocates a qrx and initializes its initial
secret immediately. But if server address validation is disabled, then
the channel creates the qrx in port_bind_channel itself, without initial
secrets. As a result, we validate the first datagram in
port_default_packet_handler, but the subsequent datagrams containing the
remaining client hello fragments fail decode.
Fix it by ensuring that we add the initial secret in port_bind_channel
if we don't give it a preconfigured qrx
Fixes openssl/project#1131
Reviewed-by: Tim Hudson <tjh@openssl.org> Reviewed-by: Viktor Dukhovni <viktor@openssl.org> Reviewed-by: Saša Nedvědický <sashan@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/27006)