# $Source: /opt/cvs/samba/smbldap-tools/INFRA,v $ # ## Some notes about the architecture Global Architecture for smbdlap-tools =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= smbldap-tools help you manage users and groups for Unix and Samba, using LDAP. They may be used in any context, and are kept relatively simplier enought to let you customize them to you needs. They need the following objectClasses to work: . sambaAccount: from samba.schema for Samba 2.2 branch . posixAccount and posixGroup : from nis.schema . organizationalUnit and dcObject: from core.schema They will probably use in a near future some additional objectClasses to support : . mail features (sendmail/postfix/qmail/courier). . conform to RFC2307 best practices (and so some maps too like merging Netbios computers (sambaAccounts) with ipHosts For ease of visualization of the LDAP objects by human standards, we used a DIT like this one : . dc=IDEALX,dc=org : the company/organization suffix . ou=Users : to store users accounts . ou=Computers : to store computers accounts . ou=Groups : to store system groups Of course, you're free to use a different naming scheme and DIT (see smbldap_conf.pm). Built in groups initial population =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= smbldap-populate.pl populate the LDAP directory with some built in groups using gidNumber according to Well Know RID of Windows NT4 Srv. In fact, As far a Samba 2.2.x is concerned, only the 'Domain Admins' (gidNumber 512) have real inpact on the Samba and Windows population. To activate this group as the Domain Administrators Group, use the following smb.conf directive (see man smb.conf for more): domain admin group = " @"Domain Admins" " However, to make pdb_ldap accept bind without being uid=0, a quick and dirty patch must be applied to 2.2.4 (see samba-2.2.4-ldapbindnotuid0.patch). This patch is Q&D because the check is there because Samba store admin credentials to establish the LDAP connection. The uid == 0 check was to ensure that a normal user could not get write access to the LDAP backend. A more logical situation should be done for 2.2.5 by checking if the user is a member of the domain admin group (reported to Jerremy and Gerald 2002-05-28). Other built in groups are really cosmetic ones with Samba 2.2.x. We did not removed them because one of these days, we whish to use Samba 3.0 where Windows Group Support should be operational. Why these specific gidNumbers ? It's about unix/windows mapping of numerical ids with Samba. Ids below 1024 are NT special ids. In fact, 512 is the RID (Windows uid/gid) for the "Domain Administrators" NT group. The magic number is found in Samba sources and possibly other Samba/Windows documentations. The goal is to have a set of Unix users who are Domain Administrators and can modify Samba datas (eg. LDAP content), with commandline tools or within Windows via Samba. Say you want to add a NT4 ws to an NT domain (controlled by a samba/ldap server). You give the domain administrator's login and password in the appropriate ws settings, then the ws contacts the samba server, which checks the credentials and use them as unix user to run the smbldap-tools (if I remember). Giving 512 as a RID to a LDAP entry marks it as a domain admin for Samba (thus Windows). Using nss_ldap, you also have an account with gid 512. Known BUGS and WORKAROUND used =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= The 2.2.2 has at least a bug : rid/primaryGroupID are read as hex in LDAP, but written as decimal. Fixed in CVS by reading as decimal. By default smbldap-useradd.pl writes decimal to LDAP. Use -x to support the odd behaviour. The samba-2.2.4-ldapbindnotuid0.patch is not a perfect solution however as the check is there because Samba store admin credentials to establish the LDAP connection. The uid == 0 check was to ensure that a normal user could not get write access to the LDAP backend. A more logical situation should be done for 2.2.5 by checking if the user is a member of the domain admin group (reported to Jerremy and Gerald 2002-05-28). # - The End