[openssl-users] Disabling Client-Initiated TLS renegotiation

Sashank Mullapudi (samullap) samullap at cisco.com
Tue Nov 22 06:51:26 UTC 2016


As part of securing our web interfaces, we wanted to disable client-initiated TLS renegotiation.

The reasoning for this requirement is as follows- Generally, renegotiation of TLS sessions is much more resource-intensive for the server than the client, and should therefore not be performed at will to avoid degrading performance. Disabling client from renegotiating secures the server from undergoing a DoS attack due to continuous renegotiation requests.

I see that there is an option SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION, but that is to secure the renegotiation, not disable it.

I wanted to check if there is a patch or flag available to disable any negotiation initiated from the client side.

Thanks and Regards,
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