[Freeipa-devel] [PATCH] 1106 IPA REST smart proxy

Rob Crittenden rcritten at redhat.com
Wed Apr 23 18:52:18 UTC 2014

Petr Viktorin wrote:
> On 04/09/2014 11:29 PM, Rob Crittenden wrote:
>> Rob Crittenden wrote:
>>> Petr Viktorin wrote:
>>>> On 03/14/2014 07:58 PM, Rob Crittenden wrote:
>>>>> Petr Viktorin wrote:
>>>>>> On 03/12/2014 07:48 PM, Rob Crittenden wrote:
>>>> [...]
>>>>>>> Here are a couple more enhancements I'm considering, this seems
>>>>>>> simpler
>>>>>>> than inter-diff since it is so small.
>>>>>> Not really. Having a patch file with a sequence+revision number you
>>>>>> can
>>>>>> refer to has its merits. Especially in a hairy thread like this one.
>>>>>> Also one of our MUAs wrapped the lines, I had to undo that manually.
>>>>>>> Here is why I made the changes, in order:
>>>>>>> I doubled the calls to create the connection but one isn't in a
>>>>>>> try/except!? Remove the obvious one.
>>>>>>> We currently completely eat GSSAPI errors, I figure we should log
>>>>>>> failures.
>>>>>>> IPA stores the principal in the request context so using that will
>>>>>>> save
>>>>>>> a GSSAPI call (and as we learned, a lock in gssproxy).
>>>>>>> I included your content-type change.
>>>>>> These changes look good.
>>>>>> I'm almost done testing but I need to call it a week.
>>>>> Awesome, thanks.
>>>> ACK on the functionality.
>>>>>> Sorry for not catching that last time, but your patch doesn't add a
>>>>>> *versioned* BuildRequres on python-kerberos, instead it adds a
>>>>>> duplicate
>>>>>> unversioned one. So lint (and thus the build) will fail if the old
>>>>>> python-kerberos version is installed.
>>>>>> A possible a solution to the build trouble would be to just add a
>>>>>> lint
>>>>>> exception now, and open a ticket to remove it later. That way the
>>>>>> build
>>>>>> succeeds despite the older version, and the new python-kerberos is
>>>>>> only
>>>>>> needed when installing freeipa-server-foreman-smartproxy.
>>>>>> That should make everyone happy, including Martin.
>>>>>> Unfortunately our lint exception mechanism doesn't work on
>>>>>> modules, so
>>>>>> this needs a somewhat nastier hack.
>>>>>> The attaching a patch that does this (and I'm pasting a simple diff
>>>>>> below). Does that look okay to push?
>>>>> I'm trying to find a better solution to all this. I may end up taking
>>>>> Martin's suggestion of rawhide-only to avoid this sort of thing.
>>>> Looks like you'll still need to silence pylint on f20 in that case.
>>>>> The deal with the smartproxy is that you can/should be able to run
>>>>> it on
>>>>> any IPA-enrolled client, so you can run it directly on the Foreman
>>>>> box,
>>>>> with the IPA server somewhere else. What this means is that someone
>>>>> could probably fairly easily package this up for other distributions
>>>>> and
>>>>> if we end up with a Fedora-only python-kerberos patch then
>>>>> smartproxy is
>>>>> Fedora-only as well.
>>>>> So I'm trying to get some movement out of upstream on this but it's
>>>>> been
>>>>> crickets for weeks. I think in the context of the calendar server
>>>>> PyKerberos is small potatoes so doesn't get much lovin'. I'll amp up
>>>>> the
>>>>> nagging to get some sort of response, even if it is "stop nagging us!"
>>>>> rob
>>>> Good luck!
>>> Ok, taking a different tack on this. Rather than running it as a
>>> separate server process, run it as a WSGI app inside Apache. This
>>> required a fair bit of re-tooling and complicates the set up a little
>>> bit. I think I've got it all covered in the man page.
>>> On the python-kerberos front I've got bugs opened in Ubuntu and Debian
>>> to see if we can get the patch accepted their until (if) upstream ever
>>> takes a look.
>> I decided to run the new WSGI app in a different process group, using
>> the smartproxy we use for delegation. This simplifies the connection
>> code, rather than using ldap2 like I was using, we use the RPC
>> interface. And it provides to process separation. As a side-effect it
>> will make running this code on platforms without GSSProxy a bit easier.
>> rob
> Works great here!
> The python-kerberos dependency issue still needs to be solved.

Build is on the way to updates-testing if you can give it a go.

> The man page says:
>     Copy ipa-smartproxy-apache.conf to
> /etc/httpd/conf.d/ipa-smartproxy.conf.
> It would be nice to put the whole path here so people don't have to
> search for the file.


> The "Configure Apache to use smartproxy" line looks like a step to be
> performed. It could use some emphasis to make it look like a header.

I combined it with the subsequent sentence so hopefully it is a bit clearer.

I also added a bit on testing so you can confirm that things are working.

> Side note, cherrypy's routing makes requests like this possible:
>      http POST
> :8090/ipa/smartproxy/host/testhost.idm.lab.eng.brq.redhat.com/some_description/True/06-00-00-00-00-00/some_userclass
> Should that be allowed?

It is definitely ugly but AFAICT it isn't illegal. The zero 
content-length bothers me more than this horrible-looking URI. It 
definitely requires some understanding of the ordering of parameters to 
get this call right.

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