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Re: back_meta does not like my LDAP_MATCHING_RULE_IN_CHAIN filter
On 03.06.14 16:52, Pierangelo Masarati wrote:
> On 06/03/2014 04:23 PM, Charles Bueche wrote:
>> Hi,
>>
>> I'm running the latest openldap stable 2.4.39 on Ubuntu.
>> My openldap server is configured as a LDAP proxy to MS-AD using
>> back-meta. It works nicely, as long as I don't use OID in filters.
>>
>> Specifically, I need LDAP_MATCHING_RULE_IN_CHAIN
>> (http://msdn.microsoft.com/en-us/library/aa746475(v=vs.85).aspx) to
>> search recursive groups in MS-AD.
>>
>> If I use that special filter directly against AD, I get my group list.
>> filter='(memberOf:1.2.840.113556.1.4.1941:=cn=ls-msp-app1,OU=App,DC=ad,DC=stuff,DC=ch)'
>>
>>
>> Or if I use a "normal" filter across my proxy, I get my group list as
>> well.
>> filter='(memberOf=cn=gs-msp-report,OU=Customers,DC=ad,DC=stuff,DC=ch)'
>>
>> BROKEN: If I use the special filter across my LDAP proxy's back-meta, I
>> get no results and filter="(?=undefined)" in my debug log.
>> filter='(memberOf:1.2.840.113556.1.4.1941:=cn=ls-msp-app1,OU=App,DC=ad,DC=stuff,DC=ch)'
>>
>>
>> So my guess is that my filter syntax with OID is not accepted by
>> back-meta.
>>
>> When using -d -1, I see this:
>>
>> ...
>> 538dd110 begin get_filter
>> 538dd110 EXTENSIBLE
>> ...
>> 538dd110 end get_filter 0
>> 538dd110 filter: (?=undefined)
>> ...
>>
>> I have looked at the code of openldap-2.4.39/servers/slapd/filter.c but
>> I don't really see what's wrong.
>
> Without looking at the code, I think OpenLDAP's slapd doesn't like
> filters with unknown OIDs, that's it. The request doesn't even get to
> back-meta.
>
> On a side note, since the filter is supposed to be passed through to
> the remote server, slapd should not worry about it; however, AFAIK
> there's no way, so far, to disable such check. The easiest way is to
> define a module that registers a dummy matching rule with that OID,
> although it won't likely be that straightforward.
>
> p.
>
Hi Pierangelo and list,
thanks for your answer, I'm very unsure now how to continue. I studied
the code of get_filter() and get_mra() without really understanding at
what time my filter is classified as invalid.
The ideas is to implement a workaround in form of a list of white-listed
OID's (only 4 are needed from
http://msdn.microsoft.com/en-us/library/cc223367.aspx), where should I
put this in the code ?
I do compile my own openldap package anyway, so I can well put some
#ifdef around this, at least to be able to continue my project. I'm now
stopped by this problem and as usual I do have to deliver rsn.
On the other side, what do you mean with "define a module that registers
a dummy matching rule with that OID" ?
Is this a module like back_meta, rwn and friends ? Do you have any
pointer like a dummy module to show where to begin ?
As you see, I'm pretty much at the beginning of the learning curve and I
am very happy to get your help.
Regards,
Charles