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Re: (ITS#8749) Proxy: LDAP-querry doesn't work for e.g (userAccountControl:1.2.840.113556.1.4.803:=2)



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steffen.krahl@nexio.de wrote:
> I'm using OpenLDAP with LDAP-backend as proxy for ActiveDirectory=20
> It's working well so far, only LDAP-queries which should exclude
> deactivated users don't work. It seems slapd does not accept queries
> like (attribute:OID:=3Dvalue)

OpenLDAP does support extended filters with a matching rule. But only
with matching rules implemented in OpenLDAP.

> in particular
> (!(userAccountControl:1.2.840.113556.1.4.803:=3D2)))

The matching rule defined by 1.2.840.113556.1.4.803 is a proprietary
matching rule defined by Microsoft for bit-wise matching. AFAICS they
never wrote a public formal spec for it. So this particular matching
rule is not implemented in OpenLDAP.

> performing upper query gets: Oct  1 00:45:33 nxld01 slapd[3002]:
> str2filter "(&(sAMAccountType=3D 805306368)(?=3Derror))" Oct  1 00:45:3=
3
> nxld01 kernel: [49436.933735] slapd[3005]: segfault at 18 ip=20
> 00007ff4f783d512 sp 00007ff4f1afc810 error 4 in=20
> libc-2.23.so[7ff4f77b9000+1c0000]

Does that mean slapd seg faults? It shouldn't.

> performing the following query
>  (&(objectClass=3D*)(userAccountControl:1.2.840.113556.1.4.803:=3D2))
> will get following log wntry:
> Oct  1 00:49:07 nxld01 slapd[3033]: str2filter
> "(&(objectClass=3D*)(!(objectClass=3D*)))"

IMO it makes perfect sense to treat extended filter part with a
non-supported matching rule as a filter which always evaluates to False.

Ciao, Michael.


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