The Lingua Franca of Directories Is LDAP in Java

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The Lingua Franca of Directories Is LDAP
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Virtual List View (VLV) The results of a search may be more than a client can manage at one time thousands or even millions of entries VLV lets a client request an arbitrary slice out of the results (for example, to allow the client to page through the results) Proxied authorization Server applications may need to do LDAP operations on behalf of (using the identity of) many different clients, perhaps connecting with a browser to a Web server This control allows authorization credentials to be passed along with any LDAP request Duplicate Entry Representation By using the control with an LDAP search, a client requests that the server return separate entries for each value held in the speci ed attributes For instance, if a speci ed attribute of an entry holds multiple values, the search operation will return multiple instances of that entry, each instance holding a separate single value of that attribute
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The LDAP Information and Naming Models: How Directories Are Organizedxxxxxxxxxx
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LDAP inherits its information and naming models from X500, and we have already hinted at the contents of those models In LDAP, data is stored as entries An entry has a distinguished name (DN) to identify it uniquely within the directory, as well as one or more attributes that describe the entry Each attribute may have one or more values Examples of attributes for an entry describing a person include cn (the rst and last name, or common name, of the person), mail (the person s e-mail address), and telephoneNumber (the person s phone number) Each entry must have at least the attribute objectclass, which de nes the type of the entry An object class de nes what attributes are required to constitute an entry and what additional attributes are allowed to be part of the entry For example, the organization object class de nes a type of entry that represents an organization Required attributes of the organization object class include o (the name of the organization) and objectclass Allowed attributes include street (the street address of the organization) and telephoneNumber (the phone number of the organization) Appendix D contains a list of commonly used object classes and attributes Attribute names are case-insensitive, so objectClass can be used interchangeably with objectclass or ObjectClass An entry usually has more than one value for the objectclass attribute Object classes are derived from other object classes The base for all object classes is top For example, the organization object class is derived from the top object class In the
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organization object class, the objectclass attribute has two values: top and organization For object classes that are not directly derived from top, all ancestors, rather
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than just the most recently derived one, typically are speci ed as values when an entry is created For example, the popular inetOrgPerson object class (used to de ne entries for people) is derived from organizationalPerson, which is derived from person, which is derived from top When you create an entry of type inetOrgPerson, you specify all four of these values for the objectclass attribute If an entry has more than one objectclass value, the entry must contain the union of all required attributes, and it may contain the union of all allowed values For inetOrgPerson, for example, the union of the values listed in Figure 2-2 apply Each object class (and each attribute) has a unique object identi er (OID) The de nitions of attribute types and object classes together make up the schema of the directory The example shown in Figure 2-2 uses the format of the schema con guration les in Netscape Directory Server Most LDAP servers derived from the University of Michigan source code use a similar format The server reads the schema con guration les when it starts up, and it will generally not allow a client to create an entry that violates the rules of the schema
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objectclass top oid 2560 requires objectClass allows aci objectclass person oid 2566 superior top requires sn, cn allows description, seeAlso, telephoneNumber, userPassword
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