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combined to form an integrated solution. For example, you might choose to use iDS in mission-critical applications, because of its clustering and high-availability features, which might be overkill in other situations. It is also possible to use the LDAP client software supplied with Solaris to connect to an LDAP server running on a different platform. Two key benefits to switching from NIS/NIS+ to LDAP are the ease of replication and the assurance of high availability. While NIS/NIS+ architecture is based on the idea of a primary server, backed up by some slaves, LDAP servers can be replicated across subnets and domains, to servers known as replicas, increasing the number of servers available for authoritative lookups and reducing the burden on any one server. In addition, updates occur rapidly between LDAP servers compared to an NIS/NIS+ architecture, which relies on uploads of all data between primary and slave servers. Although LDAP has many features, the most important of which iDS implements, LDAP also has a number of limitations. It does not have an interface defined to store data in a relational database, nor does it store data internally in a relational way. Although queries can be performed on the directory, these are not performed by using a query language (like SQL). LDAP is better designed for a reference data environment, where the types of lookups are well defined and data updates are infrequent. However, LDAP s power lies in its capability to store and manage names and data in a flexible way. While there are predefined schema elements, such as users and organizations, other elements can be added where necessary. In addition, developers can write client programs that can easily access the directory and retrieve authoritative data. Since most networked applications perform some kind of authentication, a single, centralized source of authentication data can be accessed, reducing administrative overhead. This chapter examines how to configure LDAP servers and a wide range of client services.
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Since LDAP is a directory service, its basic data element is known as an entry. Like a phone book entry, there are a number of attributes that are associated with the entry, when regarded as an object. For example, a phone directory object has a surname, first name, address, and phone number, which together comprise a single entry when instantiated. The overall organization of entries in an LDAP directory is defined by a schema, which consists of a rule set that determines what attributes can be associated with different object types. Although it is possible to define your own schemas and data models, all LDAP servers support a standard schema that promotes interoperability and is the basis for the LDAP standard, as proposed in RFC 2307. Alternatively, your application can extend the standard schema with some additional object attributes, although these may not be accessible by other servers. LDAP is used in Solaris 10 as a naming service that is compatible with existing NIS and NIS+ services. This allows integration at the present time, but also suggests future deprecation of the NIS and NIS+ services in Solaris. iDS contains a set of objects and
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their attributes that is able to store all of the data contained within NIS/NIS+ maps and tables. Additional schema data must also be stored within the LDAP directory to support client operations. The directory structure for LDAP is arranged hierarchically, from a single top node within the Directory Information Tree (DIT), to as many levels of abstraction as are required to support an organization s directory requirements. The tree structure might, for example, be based on purely geographical information, with the top node representing a country, or it might be based on organizational lines, with the top node corresponding to a company name. All entries within the tree can be identified by their Distinguished Name (DN), and each attribute of the entry can be described as a Relative Distinguished Name (RDN). Figure 30-1 shows an example DIT, with all of the common elements found therein. At the first level, the country, c, is defined as US, so the DN would simply be c=US. At the second level, the organization, o, is defined as cassowary.net, so the DN is defined as dc=cassowary, dc=net, c=US, where dc represents the Domain Component (DC). On the third level, the Organizational Unit, ou, is defined as Engineering, so the DN is defined as ou=Engineering, dc=cassowary, dc=net, c=US. On the fourth level, an individual user is identified by a Common Name (CN) of Paul Watters, and a corresponding UID of paul. Thus, the DN is uid=paul, ou=Engineering, dc=cassowary, dc=net, c=US. As you can see, it is possible to clearly distinguish individuals belonging to organizations and departments in specific countries from each other, by simply using a DN, if the DIT is defined at a fine-grained level, and assuming that no two users in the same department have exactly the same name. iDS stores all data in LDIF (LDAP Data Interchange Format) files. This standard is used by all LDAP directory servers and many messaging systems to store user and group data. Thus, it is possible to export an LDIF file with an organization s data from a previous version of iDS and import it here. Alternatively, third-party products may be able to export LDIF files that can also be read into iDS, to initialize the directory
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Example Directory Information Tree (DIT)
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