ECFLOW-1790: Default to 2048-bit dh keys

ecmwf / ecflow

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ECFLOW-1790: Default to 2048-bit dh keys #12

Closed mpartio closed 2 years ago

mpartio commented 2 years ago

RHEL8 requires at least 2048-bit dh key in it's default crypto configuration, to prevent Log Jam attacks.

Openssl is also slowly moving towards accepting only bigger keys, the current minimum length being 768 bits.

In ecFlow by default try to use a 2048-bit dh key. For backwards compatibility fall back to a 1024-bit key, even if that might mean that Openssl might reject it.

For more information see 'Logjam' security vulnerability

https://weakdh.org

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