Re: [ldapext] empty-groupOfNames-issue
Simo Sorce <simo@redhat.com> Fri, 04 December 2015 15:45 UTC
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From: Simo Sorce <simo@redhat.com>
To: Andrew Findlay <andrew.findlay@skills-1st.co.uk>
Date: Fri, 04 Dec 2015 10:44:47 -0500
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References: <5661765D.6040603@stroeder.com> <20151204134757.GE3643@slab.skills-1st.co.uk>
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Cc: ldapext <ldapext@ietf.org>, Michael Ströder <michael@stroeder.com>
Subject: Re: [ldapext] empty-groupOfNames-issue
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On Fri, 2015-12-04 at 13:47 +0000, Andrew Findlay wrote: > On Fri, Dec 04, 2015 at 12:17:49PM +0100, Michael Ströder wrote: > > > 1. Modified standard schema descriptions for 'groupOfNames' and > > 'groupOfUniqueNames': > > > > This is the work-around already chosen by various vendors: > > The MUST member or MUST uniqueMember is turned into MAY. > > > > + it just works, no interop-problems seen so far. > > + no change required in LDAP clients > > + no change required in access control rules > > + no change required in other client or server-side code dealing with groups > > > > - It violates standardization best practices, most notably IANA considerations. > > - It could serve as a bad example to change standard schema at will. > > > > Hopefully Rolf Sonneveld and Andrew Findlay will clearly comment on IANA > > considerations. > > I don't think there is an IANA consideration here. The modified schema > is (currently) incorrect according to RFC4519 or is alternatively an > experiment leading to a proposed change to a standard. In the latter > case it would have to be accepted by IETF and published in a new RFC > that obsoletes 4519. At that time, IANA would update the reference in > the Object Identifiers table to point to the new document but would have > no other involvement. > > In practice I cannot see such a change ever being accepted into the > standards track. If anything, the relatively wide distribution of > non-conformant implementations makes a stronger case for deprecating > these objectclasses for new deployments. > > The definition of groupOfNames goes right back to X.521(1988) and it was > already broken at that point: > > a) member was a mandatory attribute > > b) Nested groups were mentioned in the text but the semantics > were left undefined > > > ------------------------------------------------------------------------- > > > > 2. new object class 'groupOfEntries' > > > > Andrew kindly wrote an mini I-D defining a new structural object class > > 'groupOfEntries' simply with MAY member instead of MUST meant as direct > > replacement for 'groupOfNames'. > > > > http://tools.ietf.org/html/draft-findlay-ldap-groupofentries > > > > + Very simple > > + Fully compliant to standardization best practices > > > > - It's not clear whether it was widely adopted in deployments. > > Maybe not in the exact form I described in that I-D, but functionally > equivalent objectclasses have been in most of my customers' systems. > It could be argued that the corrupted form of groupOfNames described > above is actually proof of widespread deployment of an analogous class. My 2c: An auxiliary class may be a better choice for a standard. > > - small change required in LDAP clients for searching group entries > > - small change required in access control rules > > - small changes required in other client or server-side code dealing with groups > > Andrew -- Simo Sorce * Red Hat, Inc * New York
- [ldapext] empty-groupOfNames-issue Michael Ströder
- Re: [ldapext] empty-groupOfNames-issue Andrew Findlay
- Re: [ldapext] empty-groupOfNames-issue Michael Ströder
- Re: [ldapext] empty-groupOfNames-issue Andrew Findlay
- Re: [ldapext] empty-groupOfNames-issue Simo Sorce
- Re: [ldapext] empty-groupOfNames-issue Simo Sorce
- Re: [ldapext] empty-groupOfNames-issue Simo Sorce
- Re: [ldapext] empty-groupOfNames-issue Andrew Findlay
- Re: [ldapext] empty-groupOfNames-issue Michael Ströder
- Re: [ldapext] empty-groupOfNames-issue Michael Ströder
- Re: [ldapext] empty-groupOfNames-issue Simo Sorce
- Re: [ldapext] empty-groupOfNames-issue Jordan Brown