On Mon, Nov 11, 2019 at 12:32:22PM -0700, Phil Neumiller wrote: > I am speaking TLS 1.3 with openssl to a hardware device that I can't change. > I need the client hello header to only support certain extensions, yet I > see no way in the SSL API to remove the default extensions in the TLS 1.3 > client hello. Can I clear them all and just add the ones I want? What am I > missing? Do I have to modify the SSL code to do this? It seems like there > should be an orthodox way to do this. You have to disable them one by one; see SSL_CTX_set_options(3) and (e.g.) SSL_OP_NO_EXTENDED_MASTER_SECRET. -Ben
