RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.

+++ This bug was initially created as a clone of Bug #1247606 +++

[Note this is a dummy bug, the issue has already been fixed in 1.13-6, we're just filing it so we can clone the bug for RHEL7.2]

Description of problem:
RFE: Add support for multi-hop preauth mechs.

In the KDC, allow kdcpreauth modules to return
KDC_ERR_MORE_PREAUTH_DATA_REQUIRED as defined in RFC 6113.

In libkrb5, treat this code like KDC_ERR_PREAUTH_REQUIRED. clpreauth
modules can use the modreq parameter to distinguish between the first
and subsequent KDC messages. We assume that the error padata will
include an element of the preauth mech's type, or at least of a type
recognized by the clpreauth module.

Also reset the list of previously attempted preauth types for both
kinds of errors. That list is really only appropriate for retrying
after a failed preauth attempt, which we don't currently do. Add an
intermediate variable for the reply code to avoid a long conditional
expression.

--- Additional comment from Roland Mainz on 2015-07-28 08:24:53 EDT ---

Fixed in krb5-1.13-6.fc22 and rawhide.

QA should be sanity only.

FYI, this patch is low risk and addresses standards compliance. In particular, client support for this error code will be used in a feature we are developing currently.

(In reply to Nathaniel McCallum from comment #2)
> FYI, this patch is low risk and addresses standards compliance. In
> particular, client support for this error code will be used in a feature we
> are developing currently.

Thanks for the extra explanation.

Fix checked in (krb5-1.13.2-4.el7) ...

... marking bug as MODIFIED.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHSA-2015-2154.html