Extending samba4 schema
Matthieu Patou
mat at samba.org
Mon May 9 15:17:52 MDT 2011
Dear all,
Today at SAMBAXP 2011, I've been asked more than once can we extend
samba4's schema to add our support for XXX.
I would say yes, but wasn't too much sure, so I searched in the list and
found report from people having problems, I found this one quite intresting:
http://samba.2283325.n4.nabble.com/Extending-Samba4-schema-td3073004.html
From this schema update I extracted two files:
* zarafa.ldif
* zarafa_modify.ldif
I got this two files by splitting the adds and the modif in files
accordingly as I'm not sure that ldbadd can handle both.
I corrected the ntdsSchemaAdd and ntdsSchemaModify to add and modify
because we don't support MS extensions to ldif format (yet).
I also added the oMObjectClass:: KwwCh3McAIVK on object with a 2.5.5.1
syntax. This is needed because we don't add dynamically this value if
it's missing in the schema specification. I got the value for this class
by doing an ldbsearch on existing objects in the schema with the same
syntaxID.
**
And with this I managed to import classes and attributes but also
managed to keep my system running !
Other extensions should work correctly too, but we need an ldb module to
validate and/or populate some well known attributes values when adding
or modifying the schema. Basically it's checking that the change
complies with what is written at source4/dsdb/schema/schema_syntax.c 2331
For users eager to have schema extension, a more simplier variation
would be to write a python script that would load the ldif file into
ldb_msgs objects (in python) and the for each ldb_msg object check if
the synthax, the oMSyntax and other attributes are coherent. Although
not perfect It would help to iron out some problems with schema.
By doing so I don't see so far any big objection to have rfc2307 and SFU
schema able to be imported to samba, but I must confess I didn't had a
deeper look on this schema.
--
Matthieu Patou
Samba Team http://samba.org
Private repo http://git.samba.org/?p=mat/samba.git;a=summary
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