TLS 1.2 Client Hello CipherSuite Problem
supergicko opened this issue · 0 comments
supergicko commented
I used the newest sslshake library to test the new sni feature from @adamcaudill in #5. Works fine
However, another problem is raising up.
When having '5600' => 'TLS_FALLBACK_SCSV' in the Ciphers list, the handshake fails when having only ECDHE Ciphers on the Server Side (nginx config below)
So my question to you guys is:
do we really need the TLS_FALLBACK_SCSV CipherSuite for sslshake in the Client Hello? (thinking about why it exists i think it is not really needed in a library used for testing)
Situation:
TLS 1.2 ONLY activated
nginx config:
ssl_session_timeout 1d;
ssl_session_cache shared:SSL:50m;
ssl_session_tickets off;
ssl_ecdh_curve secp384r1;
ssl_protocols TLSv1.2;
ssl_ciphers 'ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256';
ssl_prefer_server_ciphers on;
# HSTS (ngx_http_headers_module is required) (15768000 seconds = 6 months)
add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload";
# OCSP Stapling ---
# fetch OCSP records from URL in ssl_certificate and cache them
ssl_stapling on;
ssl_stapling_verify on;