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Sometimes standards, procedures, and to some degree best practices incorporate information that needs to be updated on very frequent cycles, maybe hourly or daily. The reference list is how to handle posting the changing information. The standard or procedure can cite the list, perhaps even specifying the URL (Uniform Resource Locator) where it can be found. A reference list is also used to identify the personnel positions, operating groups, or roles that play a part in daily operations named in the policies, standards, and procedures. The names of the people in your organization who are allowed to authorize a VPN connection for a road-warrior employee, for example, should be maintained in the list of sanctioned requestors. Table 3-1 shows a brief sample reference list of authorized agents.
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Table 3-1 Example Reference List
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REFERENCE LIST OF VPN AUTHORIZING AGENTS (REVISED NOVEMBER 2005) AUTHORIZED PHONE DEPARTMENT AGENT EXTENSION E-MAIL Accounting Finance IT Opns Front Office John Doer Sally Mooer Ralph Soper Bev Secare 1-8876 2-7788 2-8191 2-7676 Jdoer Smooer Rsoper Bsecare
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Defining and Enforcing Architecture
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The reference lists in a large organization may require wide availability yet the capability to post changes to such lists must be tightly controlled to prevent compromise.
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Substantiating Guidelines
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All of the documentation to this point is instructive in nature. Each one should leave little doubt as to what the architecture team has in mind. Each level further narrows the scope of the design and operation of the information technology systems. As you move down the group of documents, you see that they leave less room for discretion in how the systems should look, function, and work together. Guidelines are the tools that allow room for the creative art needed within systems and provide space for discretion both in implementation and in operations. They permit some originality and judgment within limits that are not in conflict with the policies or standards that preceded them. The limits are contained in the guidelines. A good example of the nature of guidelines is troubleshooting lists or charts. Guidelines are general and suggestive in nature; they aren t precisely stated requirements in the way standards are. Guidelines are best used where there may be more than one good or acceptable way to do something. In a practical sense, they become optional paths to a desired outcome. (Please refer to Appendices for examples.)
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N OT E Each of the documents discussed in this chapter plays a specific role within the architecture. Each also has its limitations. For example, when it comes to access controls, there is little room in today s regulated companies for guidelines. Access controls must be derived from strong policies, detailed standards, and tightly defined procedures. If your company is trying to use guidelines for handling authentication and access controls, there is great risk that audits will result in findings that fail your control strategy.
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Substantiating Security Policy Domain Definitions
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Security policy domain definitions are the final set of IT architecture documents, which has become one of the most important. Incidents of identity theft, lost privacy information tapes, hacking successes, poor security control, a scheme based on excessively broad concepts of required security and so on. I could go on and on giving examples of these newsworthy security failures that clearly point out the enormous need for far better security definitions.
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Far too many organizations have not achieved adequate definitions. Some have not done it at all. Having a firewall for this or that does not even come close to meeting the bar for successful definition and enforcement of security domains. Every time your security fails, your security domain was effectively breached or did not exist at all. In a broad sense, a security domain can be defined as any physical area, communications channel, device, network zone, application, data store, or logical focus where security policy is different for that instance over any another like thing or its counterpart. For example, suppose you have an IP network with a firewall that enforces rules on data traffic passing through its interfaces to create a unique security zone in the network on each face of the firewall. If the firewall has unique sets of rules for each of three data ports, the networks attached are then three different security domains. The firewall itself is also a security domain from a configuration point of view. So a three-port firewall requires four security policy domain definitions. But you are not done yet. The physical access to the firewall space creates the need for a fifth security policy domain treating who is allowed to access the building and room housing the firewall equipment. The security of equipment such as firewalls demands creating a policy domain for whom and what can access it, read logs, or make changes to configuration settings or firewall rules. Every place, device, node, application, router you name it for which security is different, could be different, or should be different, requires going through the painstaking process of describing the associated policy domains in rigorous detail.
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