OpenLDAP Everywhere Revisited

Samba 3 offers new capabilites for a unified directory for all clients. Get mail, file sharing and more all working together with the latest software.

If you examine the sample output of this populate script, you should notice that it has added several new users, groups and OUs to the directory. For example, the script adds the well-known Domain Admins and Domain Users groups to the directory. The NT-based versions of Microsoft Windows all are preconfigured with specific user and group entries. Each one of those has a relative identifier (RID) associated with it. What this means to LDAP is the corresponding LDAP user or group entry must be assigned to the respective RID of the Windows user or group. Using the smbldap-populate script takes care of making the relation for you. The well-known user and groups RIDs that are required are:

Name          RID
-----------------
Domain Admins 512
Domain Users  513
Domain Guests 514

Aside from the new user and group entries, several new OU entries can provide further domain functionality. The first of these is ou=Computers, which is used to store all machine accounts for member servers and workstations on the domain. Second, the ou=Idmap is used if Samba is being used as a domain member server of a Windows server controlled domain. The last new entry is ou=NextFreeUnixId. This entry is used to defined the next UID and GID available for creating new users and groups.

Managing Your Directory

After your LDAP directory is populated and Samba is set up correctly, you are ready to start adding users and groups to populate your directory. The Idealx command-line utilities can take care of this job nicely for you. Some PHP-based directory managers are available that can be useful here as well. Consider using phpLDAPadmin and/or the LDAP Account Manager (LAM) to take on this task. Both are helpful, providing a graphical view of your directory. Each also provides the ability to view and edit LDAP entries in a user-friendly graphical environment (Figure 3). The LDAP browser, which is Java-based, is another option for viewing and editing your directory.

Figure 3. Get a Web view of your directory with phpLDAPadmin.

Since the December 2002 article, we have seen much improvement in Samba with the 3.x releases. Moving to the new version should mean greater control over accounts and improved group mapping functionality, thus giving you greater control over your domain.

Maintenance

We strongly suggest that you use simple authentication and security layer (SASL) and transport layer security (TLS) to secure your new LDAP directory. See Resources for details.

Congratulations! Your LDAP server is up and running with shared e-mail contacts, unified login and shared file storage that is accessible from any client.

Resources for this article: /article/8267.

Craig Swanson (craig.swanson@midwest-tool.com) designs networks and offers Linux consulting at SLS Solutions. He also develops Linux software at Midwest Tool & Die. Craig has used Linux since 1993.

Matt Lung (matt.lung@midwest-tool.com) provides network and computer systems consulting at SLS Solutions. He also works at Midwest Tool & Die as a Network Engineer.

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IT IS VERY USEFUL TO SOLVE PROBLEM

Anonymous's picture

GOOD. It was very useful to solve the problem,

Thank you very much

LDBM and RedHat OpenLDAP Version

Quanah Gibson-Mount's picture

There are two things wrong with this article:

(1) It shows a setup using the LDBM databse. This is very unfortunate, since LDBM is not "data safe" and will happily corrupt or lose data without informing you. See http://www.openldap.org/faq/data/cache/756.html for more information on the problems with LDBM.

(2) It shows usage of the RedHat distributed version of OpenLDAP. RedHat traditionally does a very poor job of packaging OpenLDAP, and this remains the case to this day. In addition, 2.2.13 is a very old release at this point, on a historic version of OpenLDAP. 2.3 is the current release branch, with 2.3.20 the current stable release. There are at least 2 DOS vulnerabilities in the 2.2.13 OpenLDAP release, as well as hundreds of bugs that were fixed since then.

If you are using RedHat, and want to use OpenLDAP without updating the local RedHat OpenLDAP libraries, I suggest using CDS3 silver, available for *free* from Symas.com. CDS3 is a packaged version of OpenLDAP 2.3 with *additional* features over OpenLDAP.

--Quanah

--
Quanah Gibson-Mount
Product Engineer
Symas Corporation
Packaged, certified, and supported LDAP solutions powered by OpenLDAP:

So long and thanks for all the spam?

Jason Elovich's picture

We appreciate the spam disguised as useful info, really.

Since CDS silver free

Anonymous's picture

Since CDS silver is a free packaging of OpenLDAP 2.3, I don't see this as spam, any more than me posting to let you know that I provide my own packages of OpenLDAP 2.3

Of course, both Quanah and I have vested interests in recommending that users (1) don't use ldbm, and (2) use 2.3 ... because we both end up helping the unfortunate users who get stuck after following advice like in this article on the openldap-software mailing list.

Since you don't ... well you can say whatever you like about both of these posts and we won't care.

Although you do help people

Anonymous's picture

Although you do help people Buchan and provide great packages, Quanah is more likely to insult people for not paying for support if the post actually makes it to the OpenLDAP list. It is extremely difficult to get any helpful support for OpenLDAP if you're not a guru or the topic is not absolutely, strictly limited to only OpenLDAP of the latest release.

Samba Schema

Compunuts-2's picture

I can't seem to find Samba Schema mentioned in "include /etc/openldap/schema/samba.schema" line. Can someone explain a little more on whether I really need samba schema and where I can download it? Thanks.

Location of samba schema

Dean's picture

In Debian this schema can be found in /usr/share/doc/samba-doc/examples/LDAP/samba.schema.gz, you can copy and extract this file into the schema directory. Samba doc's have to be installed of course.

You do need it. Try

Anonymous's picture

You do need it. Try googling for "samba.schema", or on your server "locate samba.schema"

automountMap vs. nisMap

drswalton's picture

Very useful article. I used their earlier articles as a guide to setting up OpenLDAP in my area, along with ones by Mick Bauer, and I couldn't have done it without them.

I only have one comment: the use of the automountMap objectClass. If you use the migrate_automount.pl script in recent versions of OpenLDAP, it uses the nisMap objectClass and nisMapName to describe automounts. I am not sure if one or the other is deprecated or both are supported.

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