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.

Add the top-level entries to the directory with ldapadd:


ldapadd -x -D 'cn=manager,dc=foo,dc=com' \
-W -f top.ldif

Then, test your work with an ldapsearch command that retrieves all entries:

ldapsearch -x -b 'dc=foo,dc=com'

Share E-Mail Contacts

At this point, we have enough structure in LDAP to put it to real use. We start by sharing our e-mail contacts. To simplify the process, you may be able to export your e-mail address book in LDIF format. For example, in Mozilla Thunderbird, you can export in LDIF from the Tools menu on the Address Book window. You do need to process the resulting file so it looks like our contacts example below. We suggest using Perl for the task.

Contacts are identified uniquely by their e-mail addresses. Here is the dn for a contact:

dn: uid=someone@somewhere.com,ou=contacts,
↪ou=people,dc=foo,dc=com.

With all of the attributes, the full entry for a contact looks like:

dn: uid=someone@somewhere.com,ou=contacts,
↪ou=people,dc=foo,dc=com
mail: someone@somewhere.com
uid: someone@somewhere.com
givenName: Someone
sn: Youknow
cn: Someone Youknow
objectClass: person
objectClass: top
objectClass: inetOrgPerson

Separate each contact entry with a blank line and save it to a file called contacts.ldif. Add the contacts to the directory with ldapadd:


ldapadd -x -D 'cn=manager,dc=foo,dc=com' \
-W -f contacts.ldif

Then, test with an ldapsearch command, as shown above.

Configure E-Mail Clients

Figure 2. To use the company address book, fill in the information on your server in Thunderbird's Directory Server Properties.

Next, we configure Mozilla Thunderbird to use the new LDAP server (Figure 2). From the Tools menu in Thunderbird, select Options. In the Composition tab, select Directory Server, Edit Directories and then Add. Fill in the Directory Server Properties with:

Name: FOO
Server: ldapserver.foo.com
base DN: ou=people,dc=foo,dc=com

In the Advanced tab, increase the number of results returned to fit your directory size. For foo.com, we selected 1,000 results.

Test your settings by composing a message to one of your contacts in your LDAP directory. The address should auto-complete as you type. Another test is to search the LDAP directory from within the Thunderbird Mail Address Book. Search in the FOO address book for “Name or Email contains: *”. That should return all of the contacts entries.

Unified Linux Login with LDAP

By storing user account information in LDAP, you can use the same user name and password at any Linux console. To start, you must decide which user names should be entered in LDAP. Table 1 shows our user scheme for UID/GIDs.

Table 1. User Scheme for UID/GIDs

Type of accountUID
System accountsUID < 500
Samba special accounts499 < UID < 1,000
Unified login accounts999 < UID < 10,000
Local users and groups, not in LDAP> 10,000

This user scheme allows for 9,000 LDAP unified login entries, while also allowing local users and groups that do not interfere with LDAP UIDs and GIDs. The user scheme also allows for the accounts required by the Samba Primary Domain Controller.

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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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