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Rüdiger Beck edited this page Jul 5, 2018 · 26 revisions

Registration of the schema

The linuxmuster.net association (Linuxmuster.net e.V. https://www.linuxmuster.net) has registered a schema:

Schema attributes:

Special attributes

The schema has some unused attributes, that can be used for upcoming stuff.

For use by an experienced administrator for her own purpose:

  • sophomorixCustom1 (SingleValue)
  • sophomorixCustom2 (SingleValue)
  • sophomorixCustom3 (SingleValue)
  • sophomorixCustom4 (SingleValue)
  • sophomorixCustom5 (SingleValue)
  • sophomorixCustomMulti1 (MultiValue)
  • sophomorixCustomMulti2 (MultiValue)
  • sophomorixCustomMulti3 (MultiValue)
  • sophomorixCustomMulti4 (MultiValue)
  • sophomorixCustomMulti5 (MultiValue)

For use by sophomorix/linuxmuster developers ONLY:

  • sophomorixIntrinsic1 (SingleValue)
  • sophomorixIntrinsic2 (SingleValue)
  • sophomorixIntrinsic3 (SingleValue)
  • sophomorixIntrinsic4 (SingleValue)
  • sophomorixIntrinsic5 (SingleValue)
  • sophomorixIntrinsicMulti1 (MultiValue)
  • sophomorixIntrinsicMulti2 (MultiValue)
  • sophomorixIntrinsicMulti3 (MultiValue)
  • sophomorixIntrinsicMulti4 (MultiValue)
  • sophomorixIntrinsicMulti5 (MultiValue)

Schema installation and update

Schema installation

Installing the sophomorix schema is NOT done by package install (since it needs a provisioned samba).

You either install the schema

  1. manually by:
  • A manual will follow to set up sophomorix without linuxmuster-base7

Or

  1. you leave the schema installation to the linuxmuster-base7 setup routine. This will also configure your samba nicely. This is the recommended way.

The installed schema consists of the following 3 files:

These 3 files will never be changed again after the beta release of LMN7.

The schema Version is found in the attribute CN=Sophomorix-Schema-Version as rangeUpper: 1 (1 is an integer and describes the schema Version)

To show the current schema Version (and sophomorix attributes) in AD, you can issue the command:

sophomorix-samba --show-sophomorix-attributes

Schema updates

To allow a modification of the sophomorix schema, there will follow updates.

Updates are files:

  • in LDIF syntax
  • named: sophomorix-schema-update-<num>.ldif
  • in the directory ....
  • increasing the CN=Sophomorix-Schema-Version to rangeUpper: <num> (This will increase the Version number)
  • containing modifications to the schema

The ldif files are loaded completely, or NOT AT ALL. So if the update files increases rangeUpper: <num> to <num> the update was succesful.

The sophomorix schema Version that sophomorix expects and updates to, is configured in:

sophomorix-devel.conf ($sophomorix_schema_version=n)

Right after binding to AD and before doing any changes to the AD, sophomorix checks the Version in AD (rangeUpper: <num> of CN=Sophomorix-Schema-Version). If it does not match with the expected Version in sophomorix-devel.conf, the AD connect will result i a exit, and sophomorix will not change anything on your system. (Some commands like sophomorix-query will work, since they are only reaing the AD)

Open questions

  • Samba 4.7.6 (ubuntu Bionic)

  • Replication of schema to another server?

    • This works on 4.7.6

  • schemaIDGUID and schemaIDGUID : Must they be just different? (or calculated?)

    • We should use a tool to create these ID's: --> which tool?
    • on schema updates these numbers might be not updated/also updated?

  • schemaIDGUID :: (Double colon)

    • The double colon means: Following Value is utfbase64 encoded

  • Enable indexing for some/which attributes?

    • Can be enabled later by searchFlags update
    • After samba restart the indexes are updated to current values
    • samba can be restarted later

  • The searchFlags can be updated by an ldif file: ldbmodify -H /var/lib/samba/private/sam.ldb ./file.ldif --option="dsdb:schema update allowed"=true

    • with the *.ldif-file:

      dn: CN=Sophomorix-Comment,CN=Schema,CN=Configuration,DC=linuxmuster,DC=local
objectClass: attributeSchema
changetype: modify
replace:searchFlags
searchFlags: 128

dn: CN=sophomorix-Add-Mail-Quota,CN=Schema,CN=Configuration,DC=linuxmuster,DC=local
objectClass: attributeSchema
changetype: modify
replace:searchFlags
searchFlags: 128

    • Can this mechanism be used to manage the searchFlags on debian package update

      • Yes, but unneccesary searchFlags modifications will lead to unneccesary schema replication

    • What if parts of the ldif fail ? --> no changes made (all or nothing)

    • modify/replace combination above for searchFlags would create this attribute, if not there

  • rangeUpper and rangeLower for attributes?

    • Without there attributes, the length is flexible
    • webui will test with a huge length in attribute sophomorixWebuiDashboard if its enough.

  • smbclient: switching back to protocol -mNT1 : How long will that work?

    • protocol version 1 will be supported for a long time on the server ( roughly ... 10 years)
    • I will show servet the commands that need the -mNT1-switch

  • Is there a way to find out which user is logged in on which computer(dnsname)/computer$/IP/MAC(one of them would be sufficient)?

    • parsing smbstatus -b is a bit awkward
    • Where are the samba event logs? Parsing these might show this users
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