ilri / rmg-ansible-public

Ansible playbooks for ILRI research-computing infrastructure
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Disable Triple DES in TLS cipher suites #56

Open alanorth opened 8 years ago

alanorth commented 8 years ago

There are issues with aging 64-bit ciphers like Triple DES and we should disable them eventually. I logged the TLS ciphers negotiated on one of our busier hosts, and here are some numbers after seven days:

# zgrep "DES-CBC3" /var/log/nginx/site-access-ssl.log* | wc -l
217
# zcat -f -- /var/log/nginx/site-access-ssl.log* | wc -l
1164376

So, in other words, 0.02% of TLS connections are using Triple DES, mostly from weird user agents like:

It's not urgent, but I'm leaving this here so we can act on it in a few months.