Red Hat Summit52.8. Retrieving an IdM ticket-granting ticket as an external IdP user
If you have delegated authentication for an Identity Management (IdM) user to an external identity provider (IdP), the IdM user can request a Kerberos ticket-granting ticket (TGT) by authenticating to the external IdP.
Complete this procedure to:
- Retrieve and store an anonymous Kerberos ticket locally.
-
Request the TGT for the idm-user-with-external-idp user by using
kinitwith the-Toption to enable Flexible Authentication via Secure Tunneling (FAST) channel to provide a secure connection between the Kerberos client and Kerberos Distribution Center (KDC).
Prerequisites
- You have created a reference to an external IdP in IdM. See Creating a reference to an external identity provider.
- You have associated an external IdP reference with the user account. See Enabling an IdM user to authenticate via an external IdP.
- The user that you are initially logged in as has write permissions on a directory in the local filesystem.
Procedure
Use Anonymous PKINIT to obtain a Kerberos ticket and store it in a file named
./fast.ccache.$ kinit -n -c ./fast.ccacheOptional: View the retrieved ticket:
$ klist -c fast.ccache Ticket cache: FILE:fast.ccache Default principal: WELLKNOWN/ANONYMOUS@WELLKNOWN:ANONYMOUS Valid starting Expires Service principal 03/03/2024 13:36:37 03/04/2024 13:14:28 krbtgt/IDM.EXAMPLE.COM@IDM.EXAMPLE.COMBegin authenticating as the IdM user, using the
-Toption to enable the FAST communication channel.[root@client ~]# kinit -T ./fast.ccache idm-user-with-external-idp Authenticate at https://oauth2.idp.com:8443/auth/realms/master/device?user_code=YHMQ-XKTL and press ENTER.:- In a browser, authenticate as the user at the website provided in the command output.
- At the command line, press the Enter key to finish the authentication process.
Verification
Display your Kerberos ticket information and confirm that the line
config: pa_typeshows152for pre-authentication with an external IdP.[root@client ~]# klist -C Ticket cache: KCM:0:58420 Default principal: idm-user-with-external-idp@IDM.EXAMPLE.COM Valid starting Expires Service principal 05/09/22 07:48:23 05/10/22 07:03:07 krbtgt/IDM.EXAMPLE.COM@IDM.EXAMPLE.COM config: fast_avail(krbtgt/IDM.EXAMPLE.COM@IDM.EXAMPLE.COM) = yes 08/17/2022 20:22:45 08/18/2022 20:22:43 krbtgt/IDM.EXAMPLE.COM@IDM.EXAMPLE.COM config: pa_type(krbtgt/IDM.EXAMPLE.COM@IDM.EXAMPLE.COM) = 152The
pa_type = 152indicates external IdP authentication.
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