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haproxy: set specific ssl ciphers

Published: 12-12-2013 | Author: Remy van Elst | Text only version of this article


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This snippet shows you how to set specific ciphers for haproxy when using an ssl frontend.

This can be used for example to allow or disallow specific SSL ciphers.

This was tested on haproxy 1.5.

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The following config is required in a frontend section:

frontend example-frontend
  reqadd X-Forwarded-Proto:\ https
  rspadd Strict-Transport-Security:\ max-age=31536000;\ includeSubDomains
  option forwardfor except 127.0.0.1
  maxconn 100
  bind 10.20.30.40:443 ssl crt /etc/ssl/certs/example.pem ciphers ECDHE+aRSA+AES256+GCM+SHA384:ECDHE+aRSA+AES128+GCM+SHA256:ECDHE+aRSA+AES256+SHA384:ECDHE+aRSA+AES128+SHA256:ECDHE+aRSA+RC4+SHA:ECDHE+aRSA+AES256+SHA:ECDHE+aRSA+AES128+SHA:AES256+GCM+SHA384:AES128+GCM+SHA256:AES128+SHA256:AES256+SHA256:DHE+aRSA+AES128+SHA:RC4+SHA:HIGH:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!SRP:!DSS
  default_backend example_backend

This is the important bit:

bind 10.20.30.40:443 ssl crt /etc/ssl/certs/example.pem ciphers ECDHE+aRSA+AES256+GCM+SHA384:ECDHE+aRSA+AES128+GCM+SHA256:ECDHE+aRSA+AES256+SHA384:ECDHE+aRSA+AES128+SHA256:ECDHE+aRSA+RC4+SHA:ECDHE+aRSA+AES256+SHA:ECDHE+aRSA+AES128+SHA:AES256+GCM+SHA384:AES128+GCM+SHA256:AES128+SHA256:AES256+SHA256:DHE+aRSA+AES128+SHA:RC4+SHA:HIGH:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!SRP:!DSS

This is an specific cipher suite for use with TLS 1.2 with RC4 as fallback.

More Info: http://cbonte.github.io/haproxy- dconv/configuration-1.5.html#ciphers

Tags: apache , haproxy , loadbalancer , snippets , ssl