On Fri, Oct 26, 2018 at 11:03:05AM -0400, Tom wrote:

Is there a way to ensure the principal generated has the lowercase user not an uppercase user showing up in kinit?

The principal is part of the ticket generated by the KDC. So you have to make sure the canonical principal on the KDC is in lower case and use canonicalization on the client side ('-C' with kinit).

HTH

bye, Sumit

Cheers, Tom

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That is an excellent question. I'm guessing you're meaning connecting to an AD back-end.

We've had beaucoup problems historically with that; AD itself is not case sensitive, but Kerberos client on Linux very much is.

Our (Windows-based) erstwhile AD admins love them some camel-case user principal names. And we're Linux engineers, so AD is not in our span of control. We're merely consumers of it.

We'd used other AD integration tools where you have an explicit option to "map samAcccountName or UPN to lower case". Then -- regardless of the case that your AD admin used for user name, it gets mapped in Linux to lower case.

I'm looking at our SSSD deployments. They seem to do this auto-magically. whatever case I use to log in, it gets accepted and it consistently maps the login name to lower case.

That's good for us, but I'd guess some companies wouldn't like this -- now the Linux account name doesn't match the Kerberos principal name.

Spike

Doesn’t look like this will work for us. Ad side is not right.

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On Oct 26, 2018, at 12:15 PM, Tom tk@mdevsys.com wrote:

Thanks Sumit. And canonicalize = yes in [libdefaults] will make that happen on login I think.

Sent from my iPhone

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On Oct 26, 2018, at 11:40 AM, Sumit Bose sbose@redhat.com wrote:

On Fri, Oct 26, 2018 at 11:03:05AM -0400, Tom wrote: Is there a way to ensure the principal generated has the lowercase user not an uppercase user showing up in kinit?

The principal is part of the ticket generated by the KDC. So you have to make sure the canonical principal on the KDC is in lower case and use canonicalization on the client side ('-C' with kinit).

HTH

bye, Sumit

...

Cheers, Tom

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Hey Sumit,

HDFS and our Hadoop suite is running into issues when users are uppercased. So we’re looking into a few possible ways around this.

My ask here is just one of the avenues we’re exploring.

I’m going to try a few of the suggestions from this thread to see if they work. Using the first option unfortunately didn’t.

Our workstations and accounts were recently updated and I suspect some need drove the AD team to shuffle things around in order to get things to work. Unfortunately that causes some minor collateral damage on our end.

SSSD has been accommodating with regards to such variances and hence the question here.

Cheers, Tom

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On Oct 27, 2018, at 10:09 AM, Sumit Bose sbose@redhat.com wrote:

...

On Fri, Oct 26, 2018 at 03:32:59PM -0400, Tom wrote: Doesn’t look like this will work for us. Ad side is not right.

Yes, first account would be 'Administrator'. That's why I said 'make sure the canonical principal on the KDC is in lower case' which might be hard with AD.

What's the reason you need the name in lower-case?

bye, Sumit

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On Oct 26, 2018, at 12:15 PM, Tom tk@mdevsys.com wrote:

Thanks Sumit. And canonicalize = yes in [libdefaults] will make that happen on login I think.

Sent from my iPhone

...

...

On Oct 26, 2018, at 11:40 AM, Sumit Bose sbose@redhat.com wrote:

On Fri, Oct 26, 2018 at 11:03:05AM -0400, Tom wrote: Is there a way to ensure the principal generated has the lowercase user not an uppercase user showing up in kinit?

The principal is part of the ticket generated by the KDC. So you have to make sure the canonical principal on the KDC is in lower case and use canonicalization on the client side ('-C' with kinit).

HTH

bye, Sumit

...

Cheers, Tom

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