Developing Directory-Based Access Control Strategies in Visual Studio .NET

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Developing Directory-Based Access Control Strategies
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service directories, within the context of the LDAP standards, and leveraging meta-functionality to move consistent and accurate information where it is needed is the foundation of a successful access control strategy. Take a few moments to go back to 3 and review the section on security policy domains. The art in creating your strategy is taking these three fundamentals and placing them within the concept of security policy domains. Better security policy domain definitions, coupled with implementing the definitions to the practical if not theoretical limits of the technologies involved, is how security is improved. As you think about designing some of the shortcomings of existing implementations, it s easy to conclude a need for more than one security policy domain surrounding your directories and access controls. What would be the right number for your organization If your access controls are required only on one application for one purpose, the security policy domains and populationspecific service directories will be few in number. If your company is international with hundreds of lines of business, your security policy domains could still be as few as 10. The security needs and requirements for access to similar applications typically determine the number of unique population directories you will use. For companies with international Web access applications, the language spoken or differing privacy laws also may have an impact on the decisions for creating additional specific-use population directories. The security policy domain definitions direct how the access controls, identity management, and provisioning are to be implemented and perform their respective functions. They also determine the locations, features, and rules that are associated with other elements such as installing firewall measures to protect the directory components. Begin the process of determining what directories are needed for access controls by putting the focus back on the context of security policy domains. Some whiteboarding or sketching may be helpful as you evaluate the options. As with any evaluation within the greater security environment, each element in the security matrix must be considered individually and collectively. Strong complementary relationships may exist at a few or all junctures within the matrix.
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Using a Checklist
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Start with this basic checklist and add to it:
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Identity What populations will be served Do the different populations require different resources Does dealing with external populations change the risk profile
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Authentication Will all be authenticated at the same level of trust Will nonrepudiation be a consideration Access control Once authenticated, will all users have access to the same resources Does every end user need access to every data element or just a subset
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Authorization Will the same underlying business process provide authorization for appropriate access What is the relationship between the population(s) and the protected data
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Administration Will the administration of the directory entries be a manual process Assessment What rudiments of risk will the assessment require the controls to counter How valuable are the target assets that are to be protected Auditing Is each population s access going to be subject to conforming with externally imposed audit requirements Will auditable access logs be required to show every access to financial reports over the last three years
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As you answer these and similar questions about your organization s unique requirements, some patterns of similar or equal requirements should begin to emerge.
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Fictional Case Study: Governor s Brew Coffee Shop
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To illustrate the security policy domain approach to your strategy for directory services, take a look at Governor s Brew, a hypothetical coffee shop on Mackinac Island. Here are the coffee shop s answers to the checklist questions. Watch to see if patterns develop.
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Identity What populations will be served Owners Managers Employees Preferred Customers Customers
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Do the different populations require different resources Yes; employees need to do daily cash point of sale only. Manager s; point of sale, financial reports. Owners; is same as managers plus bank deposits. Preferred customers; use credit, debit card with point of sale and fast-track-pass ordering. Customers; credit and debit card with point of sale. Does dealing with external populations change the risk profile Yes; system holds identifying and financial information for preferred customers.
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Authentication Will all be authenticated at the same level of trust No; more trust with owner, then manager, then employees. Will nonrepudiation be a consideration Yes; for all financial components.
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Access control Once authenticated, will all users have access to the same resources No; different resources by different groups of users. Does every end user need access to every data element or just a subset Each identified user needs a subset, except the owner, who needs all accesses to available information.
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Authorization Will the same underlying business process provide authorization for appropriate access No; different manual processes are required. What is the relationship between the population(s) and the protected data Relationship based on ownership and/or responsibility for data. Ascending scope of responsibility increases from employee to owner.
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Administration Will the administration of the directory entries be a manual process Yes; but no entries are made for nonpreferred customers. Assessment What rudiments of risk will the assessment require the controls to counter Multiple risks including financial loss, loss of good will, and liability for loss of identifying information.
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