[Freeipa-users] subjectAlternitiveName for webservice

Thu Mar 12 14:07:29 UTC 2015

Matt . wrote:
> Hi Guys,
> 
> Is Rob able to look at this ? I hope he has some sparetime as I'm
> kinda stuck with this issue.

Wildcard certs are not supported.

You can request a SAN with certmonger using -D <FQDN>. That will work
with IPA 4.x for sure, maybe 3.3.5.

rob

> 
> Thanks!
> 
> 
> 
> 2015-03-08 12:30 GMT+01:00 Matt . <yamakasi.014 at gmail.com>:
>> I'm reviewing some things.
>>
>> When I'm using a loadbalancer, which I prefer in this setup I need to
>> have the same certificates on both servers. Maybe a wildcard for my
>> domain could do instead of having only both fqdn's of the servers
>> including the loadbalancer's fqdn.
>>
>> But the question remains, how?
>>
>>
>>
>> 2015-03-07 10:37 GMT+01:00 Matt . <yamakasi.014 at gmail.com>:
>>> Hi,
>>>
>>> I will balance with IP persistance so I think there won't be any
>>> mixing as long as that "used" server is online.
>>>
>>> 2015-03-06 19:16 GMT+01:00 Dmitri Pal <dpal at redhat.com>:
>>>> On 03/06/2015 11:05 AM, Matt . wrote:
>>>>>
>>>>> OK, understood.
>>>>>
>>>>> But when a webservice does execute a command (from scripting) to a SVR
>>>>> record and the first is not reacable, would it try to do it again or
>>>>> will handle DNS this in front of it ?
>>>>>
>>>>> I do a kinit against an IPA server using a keytab after I first
>>>>> checked if the user was able to auth himself using his ldap
>>>>> credentials, if so, this kinit exec is fired and I do some CURL stuff
>>>>> to the IPA server.
>>>>>
>>>>> That's why I wanted a loadbalancer, the loadbalancer sees if a server
>>>>> is down and doesn't even try to direct any of the commands to it...
>>>>> I'm not sure if the SRV will handle this well when doing these command
>>>>> from PHP for an example. Building in extra checks in front could be
>>>>> done but it not ideal as a loadbalancer can handle such things much
>>>>> better.
>>>>
>>>>
>>>> OK, this makes things much more clear. Thanks for the explanation.
>>>> Rob. What is our failover logic for API?
>>>>
>>>> For CLI we use a negotiation and then we store a cookie so as long as the
>>>> whole conversation goes to the same server you should be fine. I do not
>>>> think you need to re-encrypt the traffic at load balancer and thus have a
>>>> cert there then if you can enforce the use of the same server in this case.
>>>>
>>>> The issue I anticipate is with Kerberos. I think you should not load balance
>>>> the Kerberos traffic, only the API commands starting with the negotiation.
>>>>
>>>> Rob does that make sense for you?
>>>>
>>>>
>>>>>
>>>>> Thanks!
>>>>>
>>>>> Cheers,
>>>>>
>>>>> Matt
>>>>>
>>>>> 2015-03-06 16:41 GMT+01:00 Dmitri Pal <dpal at redhat.com>:
>>>>>>
>>>>>> On 03/06/2015 10:24 AM, Matt . wrote:
>>>>>>>
>>>>>>> Hi,
>>>>>>>
>>>>>>> I'm really bound to a loadbalancer, as it's HA setup of loadbalancers,
>>>>>>> SRV won't fit here sorry to say.
>>>>>>>
>>>>>>> I auth users, so their keytab should be the same between two masters I
>>>>>>> believe ?
>>>>>>
>>>>>>
>>>>>> Each entity in Kerberos exchange has its own identity and key.
>>>>>> If you send a ticket that is destined to service A instead to service B
>>>>>> it
>>>>>> would not work unless they share the same keys and identity. Sharinf same
>>>>>> keys and identities between the servers just would not work with IPA.
>>>>>> Keep in mind that IPA clients and server need to work and fail over if
>>>>>> you
>>>>>> do not have any load balancers and this is the common case. You are
>>>>>> trying
>>>>>> to add one where it is really not needed creating overhead for yourself.
>>>>>>
>>>>>>
>>>>>>
>>>>>>> In that case... I need to add the altnames to the certs, but I'm not
>>>>>>> 100% there in step 6
>>>>>>>
>>>>>>> Thanks again!
>>>>>>>
>>>>>>> Cheers,
>>>>>>>
>>>>>>> Matthijs
>>>>>>>
>>>>>>> 2015-03-06 16:16 GMT+01:00 Petr Spacek <pspacek at redhat.com>:
>>>>>>>>
>>>>>>>> On 6.3.2015 15:39, Matt . wrote:
>>>>>>>>>
>>>>>>>>> I have 2 IPA servers where I kinit to and post to the api using
>>>>>>>>> curl/json.
>>>>>>>>
>>>>>>>> If we are talking purely about scripting, you can use IPA Python API.
>>>>>>>> It
>>>>>>>> will
>>>>>>>> handle fail over for you even without any load balancer. That would be
>>>>>>>> easiest
>>>>>>>> way.
>>>>>>>>
>>>>>>>>> As I need redundancy and don't want to have it script managed, but one
>>>>>>>>> central point where I can tal to I use a loadbalancer.
>>>>>>>>
>>>>>>>> Well, if you can control clients then the easiest and most universal
>>>>>>>> way
>>>>>>>> is to
>>>>>>>> use DNS SRV records and add failover logic to clients. That solution
>>>>>>>> works
>>>>>>>> even when servers are geographically distributed/in different networks
>>>>>>>> and
>>>>>>>> does not have single point of failure (the load balancer).
>>>>>>>>
>>>>>>>>> As I connect to the loadbalancer using DNAT, so the client IP is known
>>>>>>>>> on the IPA server because this is needed for the http service
>>>>>>>>> principals I need to add the loadbalancer hostname to my IPA server
>>>>>>>>> and make it as an ALT name to it's Certificate.
>>>>>>>>>
>>>>>>>>> As the users are the same on both servers I would asume i can use a
>>>>>>>>> keytab for a user against both servers from my clients.
>>>>>>>>
>>>>>>>> I'm talking about keytabs on the FreeIPA servers - services running on
>>>>>>>> IPA
>>>>>>>> server have their own keytabs too. Every service on every server has
>>>>>>>> own
>>>>>>>> keytab with different key.
>>>>>>>>
>>>>>>>> You need to talk with Simo or some other Kerberos guru about
>>>>>>>> possibility
>>>>>>>> of
>>>>>>>> sharing keytabs between IPA services.
>>>>>>>>
>>>>>>>>> Does this make it more clear ?
>>>>>>>>
>>>>>>>> I'm still not sure if you want to have human users too or just API
>>>>>>>> clients.
>>>>>>>>
>>>>>>>> Petr^2 Spacek
>>>>>>>>
>>>>>>>>> 2015-03-06 15:31 GMT+01:00 Petr Spacek <pspacek at redhat.com>:
>>>>>>>>>>
>>>>>>>>>> On 6.3.2015 15:13, Matt . wrote:
>>>>>>>>>>>
>>>>>>>>>>> Hi,
>>>>>>>>>>>
>>>>>>>>>>> But as the user is the same, I could use the same keytab for each
>>>>>>>>>>> ipa
>>>>>>>>>>> server ?
>>>>>>>>>>>
>>>>>>>>>>> I need to use the API indeed, so need to issue the http service.
>>>>>>>>>>>
>>>>>>>>>>> Any other options ?
>>>>>>>>>>
>>>>>>>>>> I do not really understand your use case. Could you describe it in
>>>>>>>>>> detail, please?
>>>>>>>>>>
>>>>>>>>>> Petr^2 Spacek
>>>>>>>>>>
>>>>>>>>>>> 2015-03-06 14:24 GMT+01:00 Petr Spacek <pspacek at redhat.com>:
>>>>>>>>>>>>
>>>>>>>>>>>> On 6.3.2015 14:08, Martin Kosek wrote:
>>>>>>>>>>>>>
>>>>>>>>>>>>> I'm figuring out how to regenerate the webserver certificates so I
>>>>>>>>>>>>> can
>>>>>>>>>>>>> use a loadbalancer in front of my ipa servers.
>>>>>>>>>>>>
>>>>>>>>>>>> Are you talking about FreeIPA web interface? It is technically
>>>>>>>>>>>> possible to use
>>>>>>>>>>>> load-balancer but it will be really hacky. You would have to solve
>>>>>>>>>>>> certificates and also distribute shared keytabs and so on.
>>>>>>>>>>>>
>>>>>>>>>>>> I would recommend you to use "something" which issues HTTP redirect
>>>>>>>>>>>> to ipa
>>>>>>>>>>>> server 1/2/3/4/5 according to current state instead of using
>>>>>>>>>>>> classical load
>>>>>>>>>>>> balancer on the network level. Normal HTTP redirect will not force
>>>>>>>>>>>> you to mess
>>>>>>>>>>>> with certs and keytabs.
>>>>>>>>>>>>
>>>>>>>>>>>> --
>>>>>>>>>>>> Petr^2 Spacek
>>>>>>>>
>>>>>>>>
>>>>>>>> --
>>>>>>>> Petr Spacek  @  Red Hat
>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> Thank you,
>>>>>> Dmitri Pal
>>>>>>
>>>>>> Sr. Engineering Manager IdM portfolio
>>>>>> Red Hat, Inc.
>>>>>>
>>>>>>
>>>>>> --
>>>>>> Manage your subscription for the Freeipa-users mailing list:
>>>>>> https://www.redhat.com/mailman/listinfo/freeipa-users
>>>>>> Go to http://freeipa.org for more info on the project
>>>>
>>>>
>>>>
>>>> --
>>>> Thank you,
>>>> Dmitri Pal
>>>>
>>>> Sr. Engineering Manager IdM portfolio
>>>> Red Hat, Inc.
>>>>
>>>> --
>>>> Manage your subscription for the Freeipa-users mailing list:
>>>> https://www.redhat.com/mailman/listinfo/freeipa-users
>>>> Go to http://freeipa.org for more info on the project