Hi Paul,
an thanks for your feedback. Causing the OpenVPN messages:

Am Dienstag, den 28.08.2018, 18:11 +0100 schrieb Paul Titjen:
> OpenVPN
> Initially had the two crypto warnings so deleted all the cert data
> and then generated new DH parameters with 3076 value.  Then generated
> new certificate data using the 3076 value. This removed the DH size
> warning but still leaves the  following:
>  
> Cryptographic warning
> Your host certificate is not RFC3280 compliant.
> Please update to the latest IPFire version and generate as soon as
> possible a new root and host certificate.
> All OpenVPN clients needs then to be renewed!
>  
>  
> I looked for any settings that I could apply in web GUI to set
> extendkeyusage with TLS Web Server Authentication in the cert
> generation to make the warning go away but could not find a way to do
> this.
The needed changes are already shipped https://git.ipfire.org/?p=ipfire-2.x.git;a=commit;h=b66b02ab73863bcb9130300d8ef0eecdc51efde3
. To get the needed changes to your certificates and configuration,
 you will need to renew the complete x509 which will also reset all existing clients.
You can find in here https://forum.ipfire.org/viewtopic.php?t=18852#p108144 
a more detailed discussion about this topic whereby OpenVPN provides some infos also 
in here https://community.openvpn.net/openvpn/wiki/DeprecatedOptions#a--ns-cert-type .

It is time until OpenVPN version 2.5 but ns-cert-type will be dropped then.


>  
> +       # Warning if certificate is not compliant to RFC3280 TLS
> rules
> +       if (-f "${General::swroot}/ovpn/certs/servercert.pem") {
> +               my $extendkeyusage = `/usr/bin/openssl x509 -noout
> -text -in ${General::swroot}/ovpn/certs/servercert.pem`;
> +               if ($extendkeyusage !~ /TLS Web Server
> Authentication/) {
> +                       $cryptowarning = "$Lang::tr{'ovpn warning
> rfc3280'}";
> +                       goto CRYPTO_WARNING;
> +               }
> +       }
> +
> +       CRYPTO_WARNING:
>  
> Is OpenVPN going to require critical extends on the certs in the
> future?
Yes, see above.

>  
> Hope this somewhat limited testing information helps.
Great, and thanks.

>  
> Regards,
> Paul
>  
>  
>