Checking Out the Endocentric Approach in Visual Studio .NET

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Checking Out the Endocentric Approach
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In the endocentric model it doesn t matter what service portal you are on anywhere on the Internet and there is no need to set up preestablished relationships. When you request a service that requires identity, the portal participating in the global access model looks first for your username presence in one of the state or federal service directories. The process is hastened if you provide the domain Florida, for example. The Florida directory supplies to the Web application only the identity elements necessary to complete the transaction and only after you key in the correct secret PIN and random string from the token card. The random string is the key (hormone) that allows the receptor (the application) to work only when given the right random number. The difference in the endocentric model is that there is no previously established or continuing relationship between the hosts and no routine exchange of data. The exchange of information is taking place on a per-transaction basis and only when the proper token string is correctly entered. The application s business processes are entirely dependant on the information provided from the global service. Figure 12-1 shows the communication paths for the different models.
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Figure 12-1 Autocentric, paracentric, and endocentric authentication models.
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As discussed in earlier chapters, the role of service directories is substantial because they also stipulate the access rights granted once proper authentication is completed. Currently it is necessary to use meta-functionality to move information into specific applications own security structures to get to finite access controls to a particular database entry in an identity management process. Directories are used to house identity information and participate in authentication by storing passwords and PINs. Service directories also play an important role in determining what an end user can access to once he is authenticated.
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Directory services must be integrated into the first two models (autocentric and paracentric) because the need for finite access controls is greater in the working environment of an organization whose employees require open access to certain information and limited access to other data. Separation of duties such as cash receipts and disbursements and controls over who enters what and when on financial reports requires the fine-grained controls that are best achieved with well-designed schemas in a directory-driven access control model coupled with the identity management and the provisioning features of meta-functionality.
Looking at Prospective New Roles for Directories
Another layer of abstraction could be beneficial by using a directory to categorize the data side of the access equation. Essentially this involves moving away from the proprietary elements of access controls internal to software applications by using a data information directory, with some standard data classification and category tagging, to work in concert with the identity service directory to control access. The idea is to extend role-based access controls for the data within a standard access relationship to defined data elements. Conventionally you set up end-user directories and establish a relationship between the person and the resource. The new thought is to establish a relationship between the information and the access roles to facilitate access where no predetermined relationship between the data and the person exists by storing access information about the data in a directory. . Two advantages emerge. First, you do not have to know ahead of time that a given individual would benefit from or want to gain access to the application data, and second, if database and data application vendors could agree to the model, access controls would be standardized and external to the applications, data storage, and databases. The proposed data-directory would hold the role definitions of who could be granted access, and the data within the application would merely need to be associated with a role. In this model, then, relating the service directory with its defined roles to the data directory with its defined data would allow anyone in a given role to access data defined for that role, and do so across all data stores regardless of who provided the underlying application or database software.