Greg Vickers wrote:
> Thanks again - we will do a re-key. Would I use the CA.pl script and
> put in the same information that is in the original CA certificate?
> Will that result in a CA certificate that can be used in browsers etc
> and will authenticate web server certificates issued by the old
> certificate? 
I think the answer is: "it depends"

I have just tested this very situation out myself a couple of weeks ago.
Had an existing CA which is going to expire in 2007, but now have heaps
of client certs out on end-user machines with expiry dates > 2007 (yes,
it can be done - don't ask why we did this - too much detail!). So I'd
*love* to be able to re-create the CA cert with a longer expiry date.

So I did. different expiry date and different serial number from the
original - but everything else identical. However, that still makes it a
"different" cert.

Anyway, I tested a new client cert signed with the new CA against an
existing Cisco VPN3000 concentrator which is configured to only accept
certs signed by the old CA - it worked!!

Then I tried it against an Apache web server configured to only accept
client certs signed by the old CA - It failed. Apache didn't recognize
the signing CA.

So I'm guessing there's a bug in Cisco's VPN solution - as I think
Apache was the one acting correctly :-(

I really hope someone who knows more than Greg and I can give an
authoritative answer to this question. I'd LOVE to know how to recreate
a CA cert (instead of creating a new one and having to touch 1000's of
machines to update them). But I get the feeling this can't be done

-- 
Cheers

Jason Haar
Information Security Manager, Trimble Navigation Ltd.
Phone: +64 3 9635 377 Fax: +64 3 9635 417
PGP Fingerprint: 7A2E 0407 C9A6 CAF6 2B9F 8422 C063 5EBB FE1D 66D1

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