c# barcode generator example What Is a Security Policy Boundary in C#

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What Is a Security Policy Boundary
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Understanding the limits of administrative privilege is a necessary part of designing secure administration. When the operative scope of administrative power is understood, either the necessary monitoring controls can be used or a decision can be made to design a different infrastructure. However, much can be done by using a security policy, even though its boundary is not absolute. A security policy boundary defines an area (such as a domain or an OU) where a security policy will be enforced. In many organizations, where autonomy is the requirement, a single forest with multi ple domains might be adequate. The domain, however, must be seen as a security policy boundary, not as a security boundary. As described previously, domains in a forest
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Designing Security for Network Management
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cannot be totally isolated from intrusion by an administrator of other domains. This means that, by policy, domain segregation and autonomy can be structured, but there are technical means to subvert that authority. Unlike the forest, the domain boundaries in a Windows Server 2003 forest can be easily crossed.
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Examples: Security Policy Boundaries
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Domains have distinct security policy boundaries. The domain has a distinct Group Policy infrastructure that is, Group Policy objects (GPOs) linked to domains and to OUs within domains have no influence over users and computers in other domains. There are even distinct parts of the GPO that are operative over the entire domain. The three policies that make up Account policies the Password policy, the Kerberos policy, and the Account Lockout policy are domain-wide policies, and each domain can maintain its own Account policy. Similarly, user rights within the domain are set at the domain level and do not affect the users in other domains.
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In most organizations, the one security requirement that will provoke the cre ation of multiple domains is the need for more than one password policy. If resources in some area of the organization require different password lengths for example, to enforce a higher degree of security separate domains will be necessary (unless you build custom application filters that require certain accounts to use passwords of longer length).
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Security policy boundaries can also be created by another type of security policy the written security policy of an organization. This type of policy specifies the security that the organization wants, but it might not be technically possible to implement it. One of my customers, for example, specifies that the Finance group s computers and users can be administered only by approved Finance group employees. The company created an OU named Finance and a Windows group named FinMan. It placed appropriate users in this group and granted full control of the Finance OU to the FinMan group. However, the company had to live with just obtaining an agreement from domain administrators to leave it alone, as there is no absolute, technical way to prevent a domain administrator from administering the OU.
How to Establish Administrative Security Boundaries
After you understand where security boundaries are and the difference between a con crete security boundary such as the single server or the forest and the policy boundary such as that provided by using domains and OUs designing the adminis trative model for security boundaries is straightforward. To establish administrative security boundaries:
Lesson 1
Managing Administrative Risks
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1. Determine where there is need for isolation. For each isolation need, create a for est, or if the need is small, create a single server. 2. Determine where there is a need for autonomy:
Where autonomy is sufficient, or centralized control is required, create a sin gle forest. In a centralized structure, when one account policy is sufficient, create one domain wherever possible. If more than one password policy is required, cre ate multiple domains. In a decentralized structure, use OUs where possible instead of separate domains. Use separate domains where a high amount of decentralization is necessary.
3. Review the security design to make sure it meshes with the performance design. For example, requiring separate domains might not be necessary for security reasons, but network architects might have determined that, because of replication and the physical design of the network, having multiple domains is the best way to go. You will have to consider what implications this strategy has for security by reviewing any additional autonomy this approach gives administrators. An exam ple of increased autonomy is the ability to create a distinct password policy.
In an organization where control is decentralized, separating administrative con trol by using OUs instead of domains is most preferable because it reduces the administra tive and financial overhead that establishing multiple domains would require. Where there is a large amount of decentralization, separate domains might be acceptable to provide groups the autonomy they want. But even in a decentralized organization, other factors such as internal politics or the need to meet military, financial, or legal requirements might require that you create separate domains or separate forests.
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