krb5_aname_to_localname() issue

[miguel.sanders@arcelormittal.com]

Very cryptic indeed, especially when you want to play around with all instance components.
It was more like trial and error for me tbh. 


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-----Oorspronkelijk bericht-----
Van: kerberos-bounces at mit.edu [mailto:kerberos-bounces at mit.edu] Namens Bjørn Tore Sund
Verzonden: zaterdag 6 juni 2009 12:54
Aan: Guillaume Rousse
CC: kerberos at mit.edu
Onderwerp: Re: krb5_aname_to_localname() issue

Guillaume Rousse wrote:
> Hello list.
> 
> We use apache-mod_auth_kerb 5.4, with
> KrbLocalUserMapping directive, allowing to map foo at REALM user string 
> to foo, through krb5_aname_to_localname() function.
> 
> However, while it works perfectly with principal from the local 
> domains, it doesn't with principal from other domains, for which a 
> trust relationship is established:
> krb5_aname_to_localname() found no mapping for principal 
> garet at LILLE.FUTURS.INRIA.FR
> 
> According to krb5_aname_to_localname man page, this is quite normal:
> This function takes a principal name, verifies that it is in the local
>       realm (using krb5_get_default_realms())
> 
> The man page for krb5_get_default_realms() seems to imply there could 
> be several default realms, but I didn't found any way to configure it 
> in krb5.conf (default_realm only takes one).
> 
> So, how can I also map principals from other trusted realms ?

Here is the setting I use in /etc/krb5.conf on machines in the UNIX.UIB.NO realm to ensure that mapping works from all *.UIB.NO realms (including UIB.NO):

[realms]
  UNIX.UIB.NO = {
     auth_to_local = RULE:[1:$1@$0](.*@.*UIB.NO)s/@.*//
  }


Rather cryptic, I know, but it is well documented and using google it should be fairly easy to find other examples of how to use it.

-BT
-- 
Bjørn Tore Sund       Phone: 555-84894   Email:   bjorn.sund at it.uib.no
IT department         VIP:   81724       Support: http://bs.uib.no
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