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that provide the meta-functionality around directories. This book simply calls them source monitors. The source monitor is a program that is running on the same host as the monitored database (the HR application, for example). The program logic controlling the source monitor is watching for changes in some fields of the database such as job description or last name. When changes of interest occur, the information is passed by the source monitor through more program logic that filters and/or translates the changed data into a format that is needed by the identity vault. The vault stores the new information for further use and distribution to the other storage for control points within the systems. The movement of the information from the identity vault is called identity provisioning, which is discussed in more detail later in this chapter. Automatic deprovisioning of end users at the end of the user life cycle is an important feature. To disable access accounts immediately when an employee leaves the organization or on changes in job duties reduces risk factors. The source monitor s inverse process is an application receptor that is set up to receive and use the information sent from the identity vault and to place it into another directory, access control list, or database. The receptor application is called various names by different software vendors also. It runs typically on the same host as the target application, and its logic can interface with the target to change passwords or to write data to specific fields. The receptor s role is to place the appropriate data into a target storage point to be used by the target in some manner such as internal-program-level access control.
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For the Web application environment, the most important destination for identity information derived from the authoritative source and moved through the identity vault is the service directory. Service directories become the information source for authentication, authorization, and access control information for each user ID provided to the actual gatekeepers. They are also the storage location where any user self-service changes can be made. End users are not given access to change every field in the directory. They are limited to only select data fields that do not change overall authorization mapping, such as cell phone number or home e-mail address. The service directory associated with each population is the central point for authentication (see Figure 7-6); as such, it is treated as a unique security policy domain in the same fashion as the identity vault but with a much different profile. For example, the service directories communicate with different hosts and should be limited to only necessary hosts.
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LDAP AUTHENTICATION CALLS FROM GATEKEEPERS Figure 7-6 A service directory handles authentication.
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The analysis to establish the security policy domain boundaries surrounding the service directories has to include limiting and controlling every possible aspect that affects the security profile. Each network and computing environment will be rife with opportunities and challenges to enhance security within all of the security policy domains. Each organization s environmental factors are unique and require detailed analysis to create the best design for their situation.
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Identity provisioning enhances IT operating environments first by cutting down on the need for routine manual administration. Identity provisioning is using the collection and distribution features associated with service directories coupled with business logic to supply other applications with the information. Innovative uses include automatic creation of e-mail accounts for new hires, building the voice mail profile for new hires, and populating an online intranet telephone book of company employees. Identity provisioning includes moving password changes to the other storage points to reduce sign-on complexity for employees using multiple services and application.
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The provisioning engine is powered by directory meta-functionality and the capability to collect and distribute the small packages of identity information to the right places. Software vendors who currently make available product suites in the provisioning marketplace also supply the source monitor and receptor software for many popular directories, applications, and databases. Partly because LDAP is one of the standards used in the directory space and the vendors want to satisfy customer demand for interfaces to legacy applications, they offer development kits to custom-build program interfaces to many existing application environments. Provisioning is achieved by using the identity vault as the information hub. All data collected goes to the appropriate vault, and all distributions of identity information originate there for each population. It increases the accuracy of the information because one source is used and only one record supplies the information for each unique end-user identity. Figure 7-7 shows an identity vault as the provisioning hub for two services.
Identity Vault MetaFunctionality Collection from identity vault Create New Account Account Information Distribution to identity vault Return # & Default PWD Distribution to identity vault Assign Next Phone # Telephone & Voice-mail E-mail Account