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concerns with implementation criteria that actually serve to keep protected data within a managed sphere of control. The reality for most organizations is that multiple directories (see Figure 6-2) are going to be evident in their IT infrastructure for some time into the future. Given the current state of the situation, the challenge for today s access control designers is how to best use directory services with as few instances of directories as possible in a way that enhances security and tightens access controls. (This chapter and 10 provide you with valuable insights for sorting out the specific needs of your organization.)
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End User A
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Network Access File and Print Services Directory Figure 6-2 Multiple directories are typical.
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External User B
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Developing Directory-Based Access Control Strategies
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Examining Directory Services
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Directory services provide identity information about end users or devices that can facilitate finite access controls by the user s username or device name when referenced by a gatekeeper such as a network operating system or a host operating system. The capability of a directory to store and rapidly retrieve identity information when requested is the keystone to access control architecture. The idea of putting information into one place so it can be quickly found and used is not new paper directories have been used for generations. Electronic directory services and the standard LDAP API can be used together, along with the capability for a meta-directory, to move directory information where it is needed to form the hub of a modern access control strategy.
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Using Hard-Copy Directories
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Historically, hard-copy directory services have been the underlying technology that facilitates finding bits of valuable information and then doing something with the information. Examples include telephone directory books to find phone numbers and city directories to find addresses for businesses and residents. Each hard-copy directory makes the next logical step easier the directory service provides information for the next step in the process, such as making the phone call or visiting the business. A level of reliance has been placed on the information provided in the paper directories as to its accuracy. In each case, the information has been collected and placed in the directory service by others; their collection process is trusted even though the user may not know how the information was collected. In the same way that a paper directory can be used over and over again and for different needs, digital directories can be referenced and used in the control strategy any number of times as a user moves deeper into the applications holding ever more sensitive data.
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Using Digital Directories
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Directory services in IT systems are used to apply access controls. They store the important bits of information that have been logically associated with a collection of resources. Resource information stored in a directory could contain entries for such objects as end users, devices, and applications. The directory can also be used for establishing relationships among the data entries. End users, for example, can be associated in a named group. Directories are designed to allow API calls to quickly wade through the hierarchy of information and return the requested data quickly. It is this capability
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to quickly return information for use in another program s process that makes directories ideal for storing relatively large amounts of identifying information about end users or other system resources. The primary access control role for directory services is to store all of the information that the actual gatekeeper mechanisms use to grant or deny access. A directory is queried for information at any necessary number of junctures as an end user places demands for various services: An end user is challenged for username and password when booting up a workstation; access to network resources is granted when the appropriate username and password combination is provided to the NOS, and Web applications require a username and password to function. In organizations with a heterogeneous computing environment, this may mean storing different username and password combinations in three different directories. It s a situation that creates a purpose-driven directory environment. Figure 6-3 illustrates how complex these authentication paths can get. Having one directory service for each purpose produces a relatively inefficient situation from a support and administration perspective. Entering data into and managing and supporting these directories takes time and drains resources. From a security standpoint, it adds complexity, making audits and additional control elements more difficult to apply. Co-mingling the information for each unique end-user population into each purpose-directory makes it harder to secure the data stored there. Having all the authentication information in one directory means that the data flow must travel across zones and security policy domains, opening data paths that increase security risks and the potential for compromise of the directory itself along with the application host. Casual implementation approaches to the use of directory services are a big part of the security problem companies are experiencing, but directories are also a way to facilitate tighter controls. A rational approach to using the power of directories in an efficient manner is the crux of the challenge of designing and deploying adequate access controls. Shifting from a purpose-driven directory paradigm to a population-specific directory model is the first step in raising the sufficiency of directory services in a way that enhances overall system security. Deploying population-specific directories appropriate to the organization s unique categories of application end users enables the building of tighter security domains incorporating customized access controls for the population. When an end-user population is defined and placed in a directory based on the users need for access to similar applications with similar levels of access rights, very finite controls can be designed to meet those specific requirements. An entire security policy domain definition can then be used to enforce the controls at every juncture in the system that relates to the access and security needs of that population. 10 provides more details on using population-specific directories.
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