Secure socket connections in CMS can be configured to request and validate a 
user certificate.

But that’s not Don’s issue.  CMS doesn’t provide any function to map a user 
certificate to a local identity (VM user ID).

Regards,
Alan

Alan Altmark
Senior z/VM Engineer and Consultant
IBM Infrastructure 
Endicott, NY         USA

> On Jun 15, 2025, at 10:22 AM, Jack Woehr <[email protected]> wrote:
> The concept of "client certificate" is baked into the modern web.
> I guess you're saying VM doesn't support this natively?
> 
>> On 6/15/25 01:05, Rob van der Heij wrote:
>> It is obviously possible to exchange a certificate once the SSL connection
>> is ready, as part of some home-grown protocol. Your client would need hold
>> that signed certificate and present it to the server. You might be able to
>> reuse some logic from GETSHOPZ where we do digital signature verification.
>> The client would have their signed credentials on file, but it's not
>> something like a password that could be used for other authentication. The
>> server side would not need to validate a password but only decode the
>> certificate that you signed.
>> 
>> Rob
>> 
>>> On Sun, Jun 15, 2025, 01:49 Donald Russell <[email protected]> wrote:
>>> Thanks Jack,
>>> No, I don’t want any sort of api/gateway/proxy thing. I was just asking if
>>> some sort of certificate sign-in was practical.
>>>> On Sat, Jun 14, 2025 at 10:31 Jack Woehr <[email protected]> wrote:
>>>> On 6/14/25 08:02, Donald Russell wrote:
>>>>> If I have a (z)cms pipe application using tcplisten, how can I make
>>> sure
>>>>> the in/outgoing traffic is encrypted?
>>>> Can you put the connection behind some kind of API gateway?
>>>> Jack Woehr               # “A learning experience is one of those things
>>>> IBM Champion 2021-2025   #  that says, 'You know that thing you just did?
>>>> http://www.softwoehr.com   #  Don't do that.'” ― Douglas Adams
> 
> --
> Jack Woehr               # “A learning experience is one of those things
> IBM Champion 2021-2025   #  that says, 'You know that thing you just did?
> http://www.softwoehr.com   #  Don't do that.'” ― Douglas Adams

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