Remote Access SSL/TLS OpenVPN without CA on pfSense

Jeff W · Sep 30, 2016, 8:50 PM

Does it mean that I can import root offline CA public key as CA that I can setup in OpenVPN? I will test ASAP. Thank you!

Jeff W · Oct 1, 2016, 9:29 AM

@johnpoz:

You can use what ever CA you want.

Again, I’d like to thank you johnpoz. Now I understand how stupid was to ask about that since I didn’t realize that I can import just public CA key.

But I still have some strange issue with it… I imported public CA key and on pfSense I created CSR (Common Name: public DNS that points to pfsense WAN) and issued certificate. In OpenVPN when I select CA and issued server cert then I will get following warning:

Warning: The selected server certificate was not created as an SSL Server certificate and may not work as expected

Then when I try to export configuration using Client Export package I get error:

Could not locate the CA reference for the server certificate.
Failed to export config files!

I think that I might have issue with server certificate. I tried several different CA templates with “Server Authentication” and with both “Client Authentication” and “Server Authentication” but OpenVPN Server setup still showing warning that it’s not SSL Server cert…

johnpoz · Oct 1, 2016, 9:52 AM

Dude you have to create the ca - with the import CA function. Then that ca could create your server cert to use with the openvpn server. You would then import that cert, which could be used by openvpn.

For example - here is where you would download a CA from Symantec
https://knowledge.symantec.com/kb/index?page=content&actp=CROSSLINK&id=SO25808

See the cert - you would paste that into your CAs And give it a name. Not sure what your doing when you say public key?

Jeff W · Oct 1, 2016, 9:51 AM

@johnpoz:

Dude you have to create the ca

I created it exactly in this way but I didn't create server cert using this CA. I just created CSR and issued it on Windows Server PKI. Thanks mate! Testing now!

johnpoz · Oct 1, 2016, 9:55 AM

Your going to have to have that CA sign your cert you request.. Or just import the cert you create on your CA for it..

Jeff W · Oct 1, 2016, 10:14 AM

@johnpoz:

Your going to have to have that CA sign your cert you request..

Yes… Exactly

I imported CA public key in the same way as on your screenshot.

Then I created CSR: Cert Manager - Certificated - Add - Create a Certificate Signing Request
I exported *.req file, imported it into Windows Server CA, issued it and I exported base 64 of it...

on pfSense I completed signing request by pasting base 64 into "Final certificate data" (I did it in past for SSL cert for Web GUI HTTPS and that works well)

johnpoz · Oct 1, 2016, 10:41 AM

Well dude how is it going to work when clearly it is NOT a server cert..

Jeff W · Oct 1, 2016, 10:51 AM

That means that I have to find out what is server cert for pfSense from the perspective of Windows Server CA. I tried several templates and they all have "Server Authentication" or server and "Client Authentication" but that probably is not enough for pfSense. I haven't found any specific Windows Server CA / pfSense guide so I will have to trial and error different configurations of template.

Thank you.

johnpoz · Oct 1, 2016, 11:01 AM

Pretty sure there is a "web server" template - I would guess that would be the template to use. I have not used windows based CA in long time.. But I do recall that template. What version of windows area you using? 2k8, 2k12 - new 2k16?

Jeff W · Oct 1, 2016, 11:09 AM

2012 R2 but this should not matter. Most of those templates are by default in 2003 version. When I try something new (for example in this case) I always start with the old one and when it works I try to "upgrade it" since new templates are better from security perspective. Funny that my SSL cert for GUI shows "Server: No" but works as expected ;-).

"Web Server" template is there… I will test it ASAP. Thank you.

Jeff W · Oct 1, 2016, 11:26 AM

Nope, still Server: No

I will try to create internal CA and server cert and export config. Then I will switch files in exported archive and try to connect. It might work since pfSense allows me to save Server configuration with "Server: No" certificate…

CDuv · Nov 3, 2016, 9:24 PM

Did you managed to find out what a "Server" certificate is?
I am not using Windows Server CA but EJBCA and having the same issue: my certificate is treated as "Server: No" by pfSense.

Derelict · Nov 3, 2016, 11:19 PM

A server certificate has this attribute:

Netscape Cert Type:
SSL Server

The following extensions are non standard, Netscape specific and largely obsolete. Their use in new applications is discouraged.

idk.