[cisco-voip] Digicert Wildcard certificates

Sun Jul 19 06:27:25 EDT 2015

Hi Nate,

I think that the concern of using wildcards generaly comes from the
security and compliance folks in that if the private key of any of the
servers was to be compromised then the resulting public and private keys
could be used to impersonate any subdomain, e.g e-payments.domain.com..

That said, as long as the customer is aware of the risk then the digicert
is a fantastic option, although a lot of these issues go away in 10.5.

The only app I've had it completely throw a wobble on so far is UCCX 9.0 as
this was checking the CN on certificate upload and didn't like * even
though the server name as in the SAN.

Cheers

Ian

On 16 July 2015 at 02:35, NateCCIE <nateccie at gmail.com> wrote:

> Most of the time wildcard certs mean you have a CSR and a private key
> generated by something, and then you upload the private key and the public
> key to lots of servers.  The application would need to be able to upload a
> private key and not require its own CSR.
>
> Cucm, unity cxn, uccx, do not support uploading a private key.
>
> Expressway, I think conductor do allow you to upload a private key.
>
> But what makes digicert really cool is you can buy the wildcard cert, then
> you keep reissuing a new certificate from that one purchase.
>
> You can do this from what I understand an unlimited times.
>
> There may be other CAs that do this.  I saw one the seemed like it was
> going to work, but since the CSR did not include the * as a SAN, they would
> not issue the cert.
>
> Digicert with the Willard includes the *.domain.com and domain.com SANs
> automatically, and you can specify about 15 other SANs for each CSR/cert.
>
> So cucm and the other apps are happy because the cert was generated using
> its own CSR.
>
> Using these certs, I had one TAC case where cucm balked at the cert, but I
> could upload the cluster wide tomcat SAN cert via im&p. This turned out to
> be a problem with the domain casing not matching between all of the servers
> and the cert. always use domain.com and not DOMain.com and life is happy.
>
> I am not affiliated with digicert other than they are here in Utah also.
> It just makes life really easy to tell the customer to buy this one cert
> and O I can make all of the Cisco UC/jabber cert errors go away!
>
> Ps. Has anyone figured out what to do with conductor wanting IP address in
> the SAN?
>
> Sent from my iPhone
>
> On Jul 15, 2015, at 10:42 AM, Anthony Holloway <
> avholloway+cisco-voip at gmail.com> wrote:
>
> I'm a little confused here.  According to this article:
> http://www.cisco.com/c/en/us/support/docs/voice-unified-communications/unified-communications-manager-callmanager/115957-high-level-view-ca-00.html#wildcard,
> and this defect ID: https://tools.cisco.com/bugsearch/bug/CSCta14114/,
> wild card certs are not supported.  Are we talking about the same thing
> here?
>
> On Wed, Jul 15, 2015 at 10:08 AM Eric Pedersen <PedersenE at bennettjones.com>
> wrote:
>
>>  Digicert lets you put your domain and subdomains of any level as SANs.
>> It’s great! They even generated a duplicate certificate for me with a
>> different root CA that was supported with WebEx enabled Telepresence. We
>> use their wildcard certificates on all of our UC servers.
>>
>>
>>
>> *From:* cisco-voip [mailto:cisco-voip-bounces at puck.nether.net] *On
>> Behalf Of *Heim, Dennis
>> *Sent:* 15 July 2015 8:28 AM
>> *To:* Ian Anderson; NateCCIE; Cisco VOIP
>>
>>
>> *Subject:* Re: [cisco-voip] Digicert Wildcard certificates
>>
>>
>>
>> I’ve found the hardest thing to find a cert providers that likes putting
>> the domain as a san such as DNS=mycollab.com. Has anyone found any
>> providers that are kosher with that? From one of the Cisco Live sessions, I
>> was told this is needed for service discovery to function properly.
>>
>>
>>
>> *Dennis Heim | Emerging Technology Architect (Collaboration)*
>>
>> World Wide Technology, Inc. | +1 314-212-1814
>>
>> [image: twitter] <https://twitter.com/CollabSensei>
>>
>> <image002.png><image003.png> <+13142121814><image004.png>
>>
>> “There is a fine line between Wrong and Visionary. Unfortunately, you
>> have to be a visionary to see it." – Sheldon Cooper
>>
>>
>>
>> Click here to join me in my Collaboration Meeting Room
>> <https://wwt.webex.com/meet/dennis.heim>
>>
>>
>>
>> *From:* cisco-voip [mailto:cisco-voip-bounces at puck.nether.net
>> <cisco-voip-bounces at puck.nether.net>] *On Behalf Of *Ian Anderson
>>
>>
>> *Sent:* Wednesday, July 15, 2015 10:18 AM
>> *To:* NateCCIE; Cisco VOIP
>> *Subject:* Re: [cisco-voip] Digicert Wildcard certificates
>>
>>
>>
>>
>>
>> On 15 July 2015 at 15:02, NateCCIE <nateccie at gmail.com> wrote:
>>
>>  Did you put all of your SANs in the digicert page?
>>
>> z
>>
>> I have this working on all of my expressway installs.
>>
>>  Hi Nate,
>>
>>
>>
>> Thanks for the quick response, just for preservation in the archives for
>> future posterity and confirmation that digicert seems fine despite the
>> warnings in the manuals, it seemed I was running into 2 separate issues.
>>
>>
>>
>> 1) I had uploaded the intermediate cert, but needed to manually download
>> and upload the root CA
>>
>> 2) That then got me past the TLS error, only to find that I had
>> fat-fingered the hostname in the SAN field :-(
>>
>>
>>
>> Cheers
>>
>>
>>
>> Ian
>>
>>
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