Re: Installing replacement certs

Brad/Jon,

I use LetsEncrypt but it really isn't any different that any other CA.  
The first time I tried to use LetsEncrypt, I had to install the CA 
root.  It's a corner case for IBM since I am guessing they made sure 
that the CA Roots for common CA's (paid) were there.  But IIRC, Tom Haze 
asked about and the last I looked, it was included with all the other CA 
Roots.

So let's back up a second.  My assumption was that IBM provided a list 
of common CA Roots and Intermediates.  But, at least here: 
https://www.ibm.com/docs/en/ssw_ibm_i_73/pdf/rzahupdf.pdf  in the 
"What's new in 7.3" section, IBM specifically says it doesn't. Whether 
it persisted into 7.4 (no reference) or 7.5 (no reference) I don't 
know.  However, on the Certificates page in DCM, filtering for 
"Certificate Authority", there is an option to "Populate with CA's" and 
the Root for LetsEncrypt is in there along with a list of many other CA's.

LetsEncrypt has this chain of trust:

Issued certificate (eg the domain you are securing) signed by R3, Let's 
Encrypt
Let’s Encrypt R3 signed by ISRG Root X1, Internet Security Research Group
ISRG Root X1 signed by DST Root CA X3, Digital Signature Trust Co.

ISRG Root X1 is cross signed so that might be why the DST Root CA X3 
isn't present in DCM.  I can tell you that all three certs, in the 
correct order, are in the .pem file that is imported into DCM.  I have 
never needed to individually import the certs, just always pull in the 
whole thing.

It's possible that you are using a CA that is new to DCM and if so, 
you'd either need to use "Populate" option if it's in the list or 
manually import them.  But it's a one-time thing.  If you use the same 
CA, you only need to do that once and having all certs in the file that 
is imported after that point in time hasn't caused me any heartburn.  
But I like to keep things simple and cheap, so I reuse my CSR's and use 
LetsEncrypt as my CA.  Like I said, been working for years.

Pete Helgren
www.petesworkshop.com
GIAC Secure Software Programmer-Java
GIAC Cloud Penetration Tester
AWS Certified Cloud Practitioner
Microsoft Certified: Azure Fundamentals

On 5/8/2023 9:40 AM, Brad Stone wrote:
> Well, he did say most of the CAs were already there, so maybe that's the
> case.  I know the last certs I've imported the CAs were already there so no
> importing of CAs required and the "bundle" imported just fine.  :)
>
>
>
> On Mon, May 8, 2023 at 9:27 AM Jon Paris <[email protected]> wrote:
>
>> Agreed - in fact it errors out if you try.
>>
>> But then I have no idea how Pete gets it to accept a bundle file in the
>> first place. It ust rejects it for me.
>>
>>
>> Jon P.
>>
>>> On May 7, 2023, at 10:34 PM, Brad Stone <[email protected]> wrote:
>>>
>>> Using DCM?  I've never been able to import a server cert if the CAs
>> aren't
>>> already there.
>>>
>>> On Sun, May 7, 2023 at 7:43 PM Pete Helgren <[email protected]> wrote:
>>>
>>>> Interesting....I just import the bundle, remembering the "bundle" is the
>>>> cert plus the intermediates (three certs in my case).  The LetsEncrypt
>>>> CA root is already present (most CA roots are already in DCM).
>>>>
>>>> I always just use the same csr since it only needs to be created once,
>>>> unless your server key changes, or the key length is changed....most of
>>>> my csr's haven't changed in years.
>>>>
>>>> The only place I got tripped up in the past when when I imported and
>>>> forgot to choose "Server or Client" and "Automatically renewed
>>>> certificate".  But I have fully automated the LetsEncrypt renewals with
>>>> DCM now so I don't have to do a manual import except in rare
>> occasions.....
>>>> Pete Helgren
>>>> www.petesworkshop.com
>>>> GIAC Secure Software Programmer-Java
>>>> GIAC Cloud Penetration Tester
>>>> AWS Certified Cloud Practitioner
>>>> Microsoft Certified: Azure Fundamentals
>>>>
>>>> On 5/7/2023 3:53 PM, Jon Paris wrote:
>>>>> OK - I just used copy/paste to create the individual certs.
>>>>>
>>>>> Thanks for the help it is all working now.
>>>>>
>>>>>
>>>>> Jon P.
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