tree ef0ebf4439afe2e8e5863a544ab442353b1cfe8a
parent 528b3fd9bef74a408ae42fc2bd03c02ed3b45b52
author Remi Tricot-Le Breton <rlebreton@haproxy.com> 1649755915 +0200
committer William Lallemand <wlallemand@haproxy.org> 1650468655 +0200

MEDIUM: ssl: Disable DHE ciphers by default

DHE ciphers do not present a security risk if the key is big enough but
they are slow and mostly obsoleted by ECDHE. This patch removes any
default DH parameters. This will effectively disable all DHE ciphers
unless a global ssl-dh-param-file is defined, or
tune.ssl.default-dh-param is set, or a frontend has DH parameters
included in its PEM certificate. In this latter case, only the frontends
that have DH parameters will have DHE ciphers enabled.
Adding explicitely a DHE ciphers in a "bind" line will not be enough to
actually enable DHE. We would still need to know which DH parameters to
use so one of the three conditions described above must be met.

This request was described in GitHub issue #1604.