I found the right man page and ended with this:

    int options = SSL_OP_ALL
                  // also try to pick the same ciphers suites more often
                  | SSL_OP_CIPHER_SERVER_PREFERENCE
                  // and don't use SSLv2, even if the client wants to
                  | SSL_OP_NO_SSLv2
                  ;
    SSL_CTX_set_options( ctx, options );

    SSL_CTX_set_cipher_list( ctx, "kEDH:HIGH:!aNULL:!MD5" );

This means: The client says what it supports, the server picks that the
_server_ likes best from the list. The server likes anything with proper
Diffie-Hellman best, and if the client supports nothing suitable, the
server will take anything openssl considers high security that client
supports.

Arnt

Reply via email to