Bug 1432903 - Set GssProxy options to enable caching of ldap tickets
Summary: Set GssProxy options to enable caching of ldap tickets
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: ipa
Version: 7.4
Hardware: Unspecified
OS: Unspecified
Target Milestone: rc
: ---
Assignee: IPA Maintainers
QA Contact: Abhijeet Kasurde
Depends On:
TreeView+ depends on / blocked
Reported: 2017-03-16 11:12 UTC by Petr Vobornik
Modified: 2017-08-01 09:46 UTC (History)
8 users (show)

Fixed In Version: ipa-4.5.0-2.el7
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Last Closed: 2017-08-01 09:46:16 UTC
Target Upstream Version:

Attachments (Terms of Use)

System ID Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2017:2304 normal SHIPPED_LIVE ipa bug fix and enhancement update 2017-08-01 12:41:35 UTC

Description Petr Vobornik 2017-03-16 11:12:46 UTC
When using gssproxy we need to enable syncing back ccaches. This allows the framework to receive back and store (in encrypted form) the ldap/ ticket acquire to talk to the directory server. Without this option each connection to the ldap server will cause a new rountrip to the KDC to acquire a new ldap/ ticket. This will increase the load on both the KDC and DS (to search the principal keys) as well as slow down each operation for the framework.

Comment 1 Petr Vobornik 2017-03-16 11:13:50 UTC
Upstream ticket: https://pagure.io/freeipa/issue/6771

Comment 2 Petr Vobornik 2017-03-16 11:15:15 UTC
Needed for IPA to be performant.

Comment 3 Martin Babinsky 2017-03-16 12:11:45 UTC
Fixed upstream

Comment 4 Jan Cholasta 2017-03-21 11:06:28 UTC
Fixed upstream

Comment 7 Simo Sorce 2017-06-06 10:12:27 UTC
The difference between the option turned off and turned on is that when the option is turned off each request to the LDAP server requires a roundtripto the KDC to acquire an LDAP ticket, while that is not necessary with the option tunerd on.

So to test you can simply compare two runs (before and after) where you use the IPA API (either vina ipa command or via web UI) to perform a number of operations as a specific test user.

With the option turned off you should see in krb5kdc.log a request for an ldap/<ipa-server> ticket by 'test' user for each operation.
Withthe option turned on you should see only one (or few) request in krb5kdc.log for all operations.


Comment 8 Simo Sorce 2017-06-06 10:13:02 UTC
See instructions above

Comment 9 Abhijeet Kasurde 2017-06-06 10:41:19 UTC
Verified using IPA version :: ipa-server-4.5.0-14.el7.x86_64

Marking BZ as verified. 

Performed sanity tests and integration tests for verification. 

As per Comment #7, seen only single ldap/<server> request for all operations.

# tail -f /var/log/krb4kdc.log
Jun 06 06:34:13 ipaserver01.testrelm.test krb5kdc[16265](info): TGS_REQ (8 etypes {18 17 20 19 16 23 25 26}) ISSUE: authtime 1496744877, etypes {rep=18 tkt=18 ses=18}, HTTP/ipaserver01.testrelm.test@TESTRELM.TEST for ldap/ipaserver01.testrelm.test@TESTRELM.TEST
Jun 06 06:34:13 ipaserver01.testrelm.test krb5kdc[16265](info): ... CONSTRAINED-DELEGATION s4u-client=testuser1@TESTRELM.TEST
Jun 06 06:34:13 ipaserver01.testrelm.test krb5kdc[16265](info): closing down fd 12

Comment 10 errata-xmlrpc 2017-08-01 09:46:16 UTC
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.


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