On Wed, 2013-12-25 at 15:27 +0100, Michael StrÃder wrote: > Arthur de Jong wrote: > > Additionally, if you plan to use the contents of the tree > > as Unix users and want to have reasonable performance for > > large trees, you should either: > > > > - use memberUid attributes > > - user member or uniqueMember with user with uid in the DN > > I strongly disagree here. > > 1. memberUid does not allow to use the same group in OpenLDAP ACLs > Also it's not possible to use slapo-refint to check/update the > reference. Furthermore slapo-memberOf only works with DN-based > attributes. This old group scheme should die, die, die. I know using DNs in groups can have some benefits in some ACLs and internal LDAP state. Also, these methods allow for group nesting which can be very convenient in some scenario's. But for external uses of LDAP data such as Unix groups (posixGroup) the memberUid attribute is much simpler to handle. > 2. As explained many times on this list the LDAP syntax > 1.3.6.1.4.1.1466.115.121.1.34 (Name And Optional UID) is seriously > broken - especially when adding the arbitrary UID part behind a DN > with DirectoryString syntax in top-level DN part. I haven't seen "Name And Optional UID" before. I was talking about having a DN with the uid attribute in it such as uid=joe,ou=people,dc=example,dc=com instead of cn=Joe Black,ou=people,dc=example,dc=com With the first DN style for users you can extract the uid attribute from the DN. This has some problems, when e.g. a posixAccount has multiple uid attributes but that causes so many other nasty side-effects that you don't want that anyway. With the second form, you always have to do an extra lookup. You can cache things, put them in a local database and use something other than LDAP search queries to search the data but that comes at a price. Cache lookups have to take into account the lifetime of cached entries and handle changes in LDAP gracefully (e.g. change uid of an attribute of a cached entry). In general, caching is difficult to get right and takes extra resources. Thanks for your comments, -- -- arthur - arthur@arthurdejong.org - http://arthurdejong.org/ --
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