[cisco-voip] Digicert Wildcard cert

[Eric Pedersen]

Digicert lets you put specific hosts into the SAN in addition to the wildcard. I haven't seen any other certificate provider with anything close to the flexibility of Digicert. I haven't tried them on CUCM but they work perfectly on VCS, even for the connection to WebEx.

Eric

From: cisco-voip [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Norton, Mike
Sent: 07 April 2016 5:13 PM
To: cisco-voip at puck.nether.net; daniel at ohnesorge.me; jcolon424 at gmail.com
Subject: Re: [cisco-voip] Digicert Wildcard cert

I use Digicert wildcard certs a lot for totally unrelated uses. Just did one yesterday. I have never seen them want to generate the private key for me. That would be silly. If anyone other than me had the private key, then it wouldn’t be very private, would it? Maybe there is a way to have them generate the private key, but I can confirm it certainly isn’t mandatory.

After submitting the CSR, before signing, they do allow you to change the CN to wildcard on their site.

They do allow you to get multiple certs with the same wildcard CN using different keypairs. They call it “Get a duplicate” and it doesn’t cost anything extra.

The only piece I’m not sure about is if they allow multiple SANs on a wildcard cert. Other than possibly that, I know the rest is doable.

Like I said, I am using them for non-UC stuff. If Cisco says they don’t support it then I’d be hesitant to do it even if it is doable.

-mn


From: cisco-voip [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Daniel Ohnesorge via cisco-voip
Sent: April-07-16 4:18 PM
To: ryanhuff at outlook.com<mailto:ryanhuff at outlook.com>; jcolon424 at gmail.com<mailto:jcolon424 at gmail.com>; Cisco VOIP <cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>>
Cc: Cisco VOIP <cisco-voip at puck.nether.net<mailto:cisco-voip at puck.nether.net>>
Subject: Re: [cisco-voip] Digicert Wildcard cert

Jose,

A few things to know; most wildcard certs from Verisign, GoDaddy etc. generate a key pair (private and public key) for you and send you a passphrase protected .pfx or .p12 file which can then be imported to IIS, Apache or any application (even Expressway for that matter). CUCM however does not allow private key import as it sees it a security risk and mandates that keys must be generated on CUCM via CSR.

The next thing to know is how CUCM deals with changes between its CSR and the certificate. The rule is that the Common Name of the CSR doesn't have to match but the SAN entries must match. So if you generate a Multi-SAN certificate CSR, CUCM will automatically put all CUCM/CUPS nodes in the list and you/the CA are expected to ensure those entries match. Theoretically, the CA could change the Common Name to *.domain.com<http://domain.com> during signing and you could actually import it in to CUCM. The challenge here is a) finding a CA which allows distinct individual keys/certs for the same wildcard Common Name and b) finding a CA that allows multiple SAN entries although the Common Name is a wildcard.

You would be better off to work with the CA to refund the Wildcard certificate and swap it with a Multi-SAN product.

Sent from my iPhone

On 8 Apr 2016, at 07:34, Ryan Huff <ryanhuff at outlook.com<mailto:ryanhuff at outlook.com>> wrote:
As far as I am aware, true wildcard certificates (*.domain.tld) are not supported with UCOS (despite whether they work or not).

Thanks,

Ryan

On Apr 7, 2016, at 5:30 PM, Jose Colon II <jcolon424 at gmail.com<mailto:jcolon424 at gmail.com>> wrote:
After reading the numerous posts saying that the wildcard certs would work I purchased the wild card cert. Just wondering how people got them to work.

Thanks

On Thu, Apr 7, 2016 at 4:24 PM, Ryan Huff <ryanhuff at outlook.com<mailto:ryanhuff at outlook.com>> wrote:
Jose,

I believe what you want are multi server (SAN) certificates for tomcat. You specify the distribution when generating the CSR.

Thanks,

Ryan

> On Apr 7, 2016, at 5:21 PM, Jose Colon II <jcolon424 at gmail.com<mailto:jcolon424 at gmail.com>> wrote:
>
> I have read a lot on forums that the digicert wildcard certs work great for UC apps as long as I am on 10.5 which I am.
>
> Can someone lay out the process of uploading these certs as I am having a hard time with them. What format do I need them. What cert goes where etc.
>
> Thanks in advance.
>
> Jose
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