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Local.YourCompanyPerson Local.YourCompanyExternalPerson Local.YourCompanyMeta
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Schema for internal objects Schema for external (for example, customers, vendors, and so on) objects Schema for meta-directory interaction, such as the mappings between various data sources and directory objects
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LDAP uses ASN.1 to keep track of schema and many internal components of the directory. Like Extensible Markup Language (XML), ASN.1 is a standard way to format information to enable its use across multiple systems.
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CHAPTER 2 s UNDERSTANDING DATA DEFINITIONS
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ASN.1 is an international standard. The benefits of a standard are that it s vendorindependent, platform-independent, and language-independent. It s a language used for specifying data structures at a high level of abstraction that enables them to be used across a large number of different systems. It s supported by rules that determine the precise bit patterns to represent values of these data structures when they have to be transferred over a computer network using a variety of encoding methods. It supports a great number of tools in order to map the ASN.1 notation to data structure definitions in the parsing language of your choosing. A good place to start when looking at ASN.1 information is the home page of the ASN.1 Consortium (http://www.asn1.org). There you can find links to many of the tools available to create and parse ASN.1 data. Common tools include Asnp and Ecnp. ASN.1 extensions are also available for common editors such as emacs. Online translators that convert from Web-based XML to ASN.1 are also available. The abstract syntax used by ASN.1 enables you to produce specifications without running into various encoding issues or the specific binary- or character-based realities of a protocol. That is, it s a common language, akin to Hypertext Markup Language (HTML), that, when used correctly, enables a single set of data to be interpreted by a number of systems with the same overall results. Familiarity with ASN.1 isn t necessary for understanding LDAP but is required if you want , a better understanding of the data structures used to configure your system. Most of the core configurations for your directory will be stored in this format. You ll be able to modify these files by using a suite of tools or by directly manipulating the configuration files.
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Object Identifiers (OIDs)
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A globally unique OID defines each element of schema. Like your directory, OIDs are hierarchical. You may have run across OIDs if you ve interacted with a network monitoring system, because Simple Network Management Protocol (SNMP) relies heavily on OIDs for its hierarchy. Table 2-3 shows the common branching of OIDs. Table 2-3. Common Branching of OIDs
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1.1 1.1.1 1.1.2 1.1.2.1 1.1.2.1.1 1.1.2.2 1.1.2.2.1
Assignment
Organization s OID SNMP elements LDAP elements AttributeTypes MyAttribute Object classes myObjectClass
The original intention was that anyone would be able to obtain an OID if they requested one. IANA, ANSI, and BSI (which is for U.K. organizations) currently maintain OID registries. OIDs are allocated in a hierarchical manner so that the authority for 1.2.3, for example, is the only one that can specify the definition for 1.2.3.4. The formal definition of an OID comes from the ITU-T recommendation X.208 (ASN.1). The dot notation in OIDs comes from the
CHAPTER 2 s UNDERSTANDING DATA DEFINITIONS
IETF. The ITU thought it better to have notation using spaces and braces, with optional text tables, so that 1.3.6.1 would become something like this: {iso(1) org(3) dod(6) iana(1)} {1 3 6 1} {dod 1} The IETF considered this illogical and used a dot notation instead. Following an OID tree is akin to following a hierarchical directory tree. Starting at the top, you ll find the highest common denominator that groups all elements below it (such as the organization name). Below that, you ll find subcategories and other details up to the final destination. The OID structure follows the same hierarchical structure you ll be familiar with from your LDAP study. At the top is the head of the tree, and information becomes more detailed when expanded (see Table 2-4). Table 2-4. The OID Structure
1 1.3 1.3.6 1.3.6.1 1.3.6.1.4 1.3.6.1.4.1 1.3.6.1.4.1.1466 1.3.6.1.4.1.1466.115 1.3.6.1.4.1.1466.115.121 ISO-assigned OIDs ISO-identified organization U.S. Department of Defense OID assignments for Internet Internet private IANA-registered private enterprise Mark Wahl (Critical Angle) LDAPv3 schema framework LDAPv3 syntaxes
It s possible to look up information on specific OIDs and related subtrees in various OID registries available on the Internet. The result of inputting 1.3.6.1.4.1.1466.115.121 will yield some basic information and, often, pointers to future references, including request for comments (RFCs). Figure 2-1 shows an example of a common interface you can use for performing these lookups. One such interface is available from France Telecom at http://asn1.elibel.tm.fr/ oid/search.htm. Using this interface, you can search the OID tree by the branch, identifier, number, description, rules, or even the parties responsible for submitting and registering specific OIDs.
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