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Re: Elementary PKINIT questions (MIT Kerberos/Linux configuration)

daemon@ATHENA.MIT.EDU (Jason White via Kerberos)
Tue Mar 28 10:14:16 2023

Message-ID: <a9fb47a6-b7bf-bf06-8b61-2ebc22ac9b1c@jasonjgw.net>
Date: Tue, 28 Mar 2023 10:08:32 -0400
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From: Jason White via Kerberos <kerberos@mit.edu>
Reply-To: Jason White <jason@jasonjgw.net>
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On 28/3/23 09:24, Ken Hornstein wrote:
> You can specify the certificate exactly on the 'kinit' command line
> with the "-X X509_user_identity" option (this has the same format
> as the pkinit_identities option in krb5.conf).  Now this option isn't
> supported for kadmin, but you can do:
> % kinit -X X509_user_identity=FILE:/tmp/foo.pem -S kadmin/admin jason/admin
> or
> % kinit -X X509_user_identity=FILE:/tmp/foo.pem -S kadmin/admin.host jason/admin
> Depending on the principal you are using for kadmind, and then you can use
> the "-c credential_cache" option to kadmin to use an existing credential
> cache.

Thank you - that worked as described, once I gave kadmin the correct 
credentials cache.

> I have had success using a YubiKey 5 in PIV mode which also supports
> a bunch of other things like FIDO 2; I have no connection with Yubico
> other than as a user.  Yubico provides a PKCS#11 module but in PIV mode
> you should be able to use any PKCS#11 module that supports PIV (this is
> very common).  One advantage to a YubiKey is it is just USB and does not
> require a dedicated smartcard reader.  Note that this is a lot of moving
> parts and probably will require a fair amount of fiddling.
Yes, exactly. I'm contemplating Yubikeys, however, for this and other 
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