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The term meta-directory is used to describe a directory that combines or aggregates information from multiple directories into itself or provides a point for a common view of the disparate directories. A meta-view allows all the information contained in multiple directories to be accessed from one place. This adds convenience but reduces security enhancement options. The typical implementation of a meta-directory as the single directory for all authentication
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and access control reduces the security domains related to directory services to one. Your ability to apply additional controlling elements is extremely limited when all authentication calls are done with a single directory or single metadirectory model, which, unfortunately, is often presented as ideal by many vendors. It does at first present the appearance of convenience until you try to engineer out some of the risks of having multiple populations with differing rights accessing and using the same directory. The one-directory model also usually leads to the need for a more complex schema development. The choice between using a meta-directory as the authentication point or simply using the meta-functionality to move information from one directory or data store to another leads to very different security policy domain definitions. When one meta-directory is used as the authentication point, options for enhanced access controls are reduced from what you would have with population-specific directories being serviced by a metadirectory acting solely as an identity-provisioning resource. Figure 6-4 shows a meta-directory collecting user identity information from three specific-use directories. Using aggregated data for provisioning to other repositories is discussed in detail in 10.
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Complementary software associated with meta-directories has features used to place information from one directory s entries to another directory by using descriptors called tags to customize how the data is translated correctly from one to the other. This capability to apply some process logic to the transfer of directory information gives rise to the whole topic of identity provisioning of services throughout an organization s IT infrastructure. Identity provisioning software allows one instance of identity information contained in the metadirectory (often called the identity vault), which can be passed to every point where identity information is needed and stored. A stored password for file and print services, for example, can be provisioned (moved) to the e-mail authentication directory. Provisioning also standardizes the identity data needed in the different directories or access control lists. The features that facilitate the exchange of data from one directory to another can also be used to exchange information from one directory with other storage points such as databases. The capability to use some business process logic and filtering with a meta-directory as the central hub to move information from place to place is important meta-functionality. The business logic features in the provisioning tools can be used to change the format of the information when a different one is needed by another directory or storage
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point. For example, an IP-phone speed-dial directory may not want the dashes between the area code, exchange, and the last four digits of the phone number and the voice mail system may need the dashes to work properly. The provisioning software, once written to make the conversion, would always use the correct format needed by the storage point as it moves directory identity data from one storage point to the other. In Figure 6-5, the distribution of directory information is dependant on software that provides the capability for customized rules and filtering and can be used with small real-time synchronization applications that provide the interface to target repositories. Each vendor providing provisioning software uses its own name for the application interfaces.
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Company Meta Directory (HQ) (FACTORY) (SALES) Figure 6-4 Meta-directories aggregate information.
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HQ Directory Figure 6-5 Meta-directories provide hub share points.
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Directories, LDAP standards, and meta-features are all useful in the own right and have been designed and long used to solve problems in their area of direct functionality. The power to improve the security profile of the entire access controls spectrum comes in combining them into complementary interoperating systems and deploying them in ways that improve the overall security policy domains in an inventive fashion. The combination of using meta-directories and