Dissecting an object in .NET

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Dissecting an object
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An entry is composed of the DN, the object being created (in this case, the ou), and two object class definitions. We talked about objects and restrictions on what can be stored in each object, and the objectClass entry is what defines this. The top objectClass is very special as it says that all objects should be defined by an objectClass. It may seem bizarre that there is an object class that defines that an object must have a class, but it means that the LDAP structure is totally modular and not hardcoded. The organizationalUnit objectClass defines the object to be an Organizational Unit (an ou). There are many other objectClasses that define a massive set of objects that can be used to describe anything that would traditionally fit into an LDAP server. We will come across more throughout the chapter.
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Note An object may be defined by multiple object classes to be able to provide a large breadth of information. We will see this in practice when dealing with people, but for now, understand that it is not just one object class, one object.
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Inserting the LDIF file
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When the LDIF file that contains an organizational structure has been created, you need to enter that information into the LDAP server. First, make sure your LDAP server is running:
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bible:~ # rcldap status Checking for service ldap: running
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When the LDAP server is running, you need to add the entries (see Listing 24-3).
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24 Working with LDAP in SUSE
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Listing 24-3: Inserting LDIF Entries into LDAP
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bible:~ # ldapadd -D cn=admin,o=Acme,c=UK -x -W -f /tmp/top.ldif Enter LDAP Password: adding new entry o=Acme,c=UK adding new entry ou=Sales,o=Acme,c=UK adding new entry ou=Marketing,o=Acme,c=UK adding new entry ou=IT,o=Acme,c=UK adding new entry ou=HR,o=Acme,c=UK adding new entry ou=Services,o=Acme,c=UK adding new entry ou=Helpdesk,ou=IT,o=Acme,c=UK adding new entry ou=Architects,ou=IT,o=Acme,c=UK adding new entry ou=Administrators,ou=IT,o=Acme,c=UK
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The ldapadd command is similar in use to the ldapsearch command. You need to bind (-D) as the administrator, with a simple bind (-x) and get ldapadd to ask you for the password (-W). The only difference is the -f parameter to specify the location of the LDIF file we have created. All being well, the entries defined in the LDIF file will be added to the LDAP server. Now that you have the organizational structure in the LDAP server, you need to populate it with some objects.
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Adding user data to the LDAP server
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You need to define what information you will hold about users before you create the LDIF files. As you are going to use this information to hold user accounts as well as information about users, you will use the inetOrgPerson, person, posixAccount, shadowAccount, and organizationalPerson object classes.
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Note You can find more information about the data you can use in an LDIF file and also in an LDAP server in the OpenLDAP schemas. These are located in /etc/openldap/schema.
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Referring to the schema in /etc/openldap/schema, you can see that the person object class can contain the information shown in Table 24-1.
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Table 24-1: person Object Class
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Element Description Second name* Common name* Password Contact number Freeform referral entry Description of the user
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sn cn UserPassword TelephoneNumber SeeAlso Description
*Must be in the object data
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Each object class defines what each object can contain, and this information is defined in the LDAP schema files. For more information on what is included in an object class, view the schema files in /etc/openldap/schema. You now need to construct an LDIF file for the users. In Listing 24-4, we detail one of the users so that you can see how her profile would look in this organization.
Listing 24-4: LDIF Listing for Aimee Davies
dn: uid=aimee,ou=Administrators,ou=IT,o=Acme,c=UK uid: aimee cn: Aimee Davies givenName: Aimee sn: Davies objectClass: person objectClass: organizationalPerson objectClass: inetOrgPerson objectClass: posixAccount objectClass: top objectClass: shadowAccount userPassword: {crypt}ESLp8vFJWpVEE shadowLastChange: 12572 shadowMax: 99999 shadowWarning: 7 loginShell: /bin/bash uidNumber: 1000 gidNumber: 100 homeDirectory: /home/aimee telephoneNumber: 555-1027 o: Acme UK gecos: Aimee Davies
24 Working with LDAP in SUSE
We have constructed an LDIF file for the administrator Aimee Davies, including account information allowing her to use the LDAP data as a Unix authentication source. To construct the initial LDIF file, we used the PADL migration tools to transfer a standard user account from /etc/passwd to an LDIF format file, editing this file to add the extra information about the organization and also her telephone number. You can add each user in the organization to the specific ou that reflects the Org chart. Using the ldapsearch command, you can now view the data in the LDAP server (see Listing 24-5). You use the -b option to tell ldapsearch that it should search from the o=Acme,c=UK base of the LDAP tree. This allows you to search a certain portion of the LDAP tree, not the whole tree.