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From "Jonathan Hurley" <jhur...@hortonworks.com>
Subject Re: Review Request 31483: Root user has spnego (HTTP) kerberos ticket set after Kerberos is enabled, root should have no ticket.
Date Fri, 27 Feb 2015 14:22:11 GMT


> On Feb. 26, 2015, 12:14 p.m., Jonathan Hurley wrote:
> > ambari-server/src/main/resources/common-services/HIVE/0.12.0.2.0/package/alerts/alert_webhcat_server.py,
line 109
> > <https://reviews.apache.org/r/31483/diff/1/?file=878322#file878322line109>
> >
> >     Same as above; hard coding the /tmp path.
> 
> Robert Levas wrote:
>     Do you know how to get the `tmp_path` value from the `Environment` from this point
in the code?  I am not familair enough with this to figure it out.  Or maybe `tmp_path` is
in the `parameters` dictionary?

The agent has it's own tmp location configuration in /etc/ambari-agent/conf/ambari-agent.ini

```
[agent]
tmp_dir=/var/lib/ambari-agent/data/tmp
```

You can use this; it's accessed from AmbariConfig.py


- Jonathan


-----------------------------------------------------------
This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/31483/#review74285
-----------------------------------------------------------


On Feb. 26, 2015, 7:02 a.m., Robert Levas wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/31483/
> -----------------------------------------------------------
> 
> (Updated Feb. 26, 2015, 7:02 a.m.)
> 
> 
> Review request for Ambari, Andrew Onischuk, Emil Anca, Jonathan Hurley, and Vitalyi Brodetskyi.
> 
> 
> Bugs: AMBARI-9785
>     https://issues.apache.org/jira/browse/AMBARI-9785
> 
> 
> Repository: ambari
> 
> 
> Description
> -------
> 
> After enabling Kerberos, the root user has the spnego user set for it 
> 
> ```
> [root@c6501 ~]# klist
> Ticket cache: FILE:/tmp/krb5cc_0
> Default principal: HTTP/c6501.ambari.apache.org@EXAMPLE.COM
> 
> Valid starting     Expires            Service principal
> 02/18/15 22:14:51  02/19/15 22:14:51  krbtgt/EXAMPLE.COM@EXAMPLE.COM
> 	renew until 02/18/15 22:14:51
> ```
> 
> It appears that the issue is related to the agent-side scheduler and/or some job that
is scheduled to run periodically. Apparently some job is kinit-ing with the SPNEGO identity
as the running user (root in this case) without changing the ticket cache. Thus whenever the
job runs the root user's ticket cache gets changed to contain the SPNEGO identity's ticket.
> 
> While investigating and solving the issue it was found that other credentials were added
to this cache, overwriting what was there, during backround processing, as well.
> 
> Most of the issues were releated to _alert_ checking on web-based UI endpoints while
configuring the environment for curl to use Kerberos authentication.  Another place (in Oozie)
was a failure to run a command as the `oozie` local user.
> 
> Solving this includes using an alternate credential cache when kinit-ing. While at it,
the cached is checked to see if the tickets are expired (or even there) before kinit-ing.
> 
> 
> Diffs
> -----
> 
>   ambari-agent/src/main/python/ambari_agent/alerts/web_alert.py 8ee6606 
>   ambari-common/src/main/python/resource_management/libraries/functions/__init__.py 44d235c

>   ambari-common/src/main/python/resource_management/libraries/functions/get_klist_path.py
PRE-CREATION 
>   ambari-server/src/main/resources/common-services/HIVE/0.12.0.2.0/package/alerts/alert_webhcat_server.py
970ddde 
>   ambari-server/src/main/resources/common-services/OOZIE/4.0.0.2.0/package/alerts/alert_check_oozie_server.py
a5a066b 
>   ambari-server/src/main/resources/common-services/OOZIE/4.0.0.2.0/package/scripts/oozie_service.py
092149d 
>   ambari-server/src/main/resources/stacks/BIGTOP/0.8/services/OOZIE/package/files/alert_check_oozie_server.py
a5a066b 
>   ambari-server/src/main/resources/stacks/BIGTOP/0.8/services/WEBHCAT/package/files/alert_webhcat_server.py
970ddde 
>   ambari-server/src/test/python/stacks/2.0.6/OOZIE/test_oozie_server.py 45e9dc4 
> 
> Diff: https://reviews.apache.org/r/31483/diff/
> 
> 
> Testing
> -------
> 
> Manually tested all services in test cluster to see which might have this issue. Found
only OOZIE and HIVE issues and tests showed they are fixed and working as they should.
> 
> #Jenkins Test Results
> 
> [INFO] ------------------------------------------------------------------------
> [INFO] BUILD SUCCESS
> [INFO] ------------------------------------------------------------------------
> [INFO] Total time: 01:12 h
> [INFO] Finished at: 2015-02-26T06:35:45+00:00
> [INFO] Final Memory: 44M/457M
> [INFO] ------------------------------------------------------------------------
> 
> 
> Thanks,
> 
> Robert Levas
> 
>


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