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What Are Isolation and Autonomy
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Autonomy is a situation in which external control is possible even while local control is the way things are done. Isolation means that there is a clear, precise boundary and that there is no inherent connection or way for administrators from one network to administer another. This section provides guidelines for applying isolation and auton omy to administrative roles and provides several examples.
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Guidelines for Applying Isolation and Autonomy to Administrative Roles
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Defining administrative roles within organizations is difficult. One of the first decisions to make is how far authority will extend. In some organizations, centralized control is
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Designing Security for Network Management
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the norm. Although delegation of administrative authority might be applied, central administrative roles assign, supervise, and monitor all administrative functions. In other organizations, a more decentralized approach is used. The organization might be logi cally divided and different parts given autonomy over the management of their users and computers. Each part administers its own IT infrastructure. In a decentralized organization, you must determine whether absolute isolation is required or whether simple autonomy is OK. That is, can each separate group, given its own sphere of management, accept that control over its function can be usurped by headquarters Can the group work within such a framework, or do they need to exist in isolation Must there be no connection that could possibly allow intrusion upon their administrative authority In some organizations, this isolation is imperative. There might also be legal reasons that require it.
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Examples: Where Autonomy and Isolation Can Be Used
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Some examples of where isolation might be required include military organizations, Web or application hosting scenarios, businesses for which a public directory must be separated from a private directory, and organizations such as financial organiza tions that operate in international venues. For example, the Active Directory directory services for a company that provides investment banking and stock market analysis might need to be isolated to ensure that no information flows between the users or administrators of each group. Autonomy might be used by corporations that are centrally managed and by smaller organizations in which there is one administrative management function. For example, while domain administrators in these scenarios might maintain the security configura tion of all computers in the domain by using Group Policy, they might grant organiza tion unit (OU) administrators the ability to further secure computers in the OU that they manage. The OU administrators would have autonomy but not isolation.
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What Are Security Boundaries
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Security boundaries are borders beyond which security authority does not extend. Strictly speaking, no security principal, right, or privilege that is valid on one side of the border is valid on the other. Security boundaries provide isolation of administrative authority.
Examples: Security Boundaries
One example of a security boundary is the boundary between two Microsoft Windows Server 2003 computers that are not joined in a domain. The local Administrator account on one of these computers has no rights on the other. For one person to administer both servers, she would need an account in each of the local account databases and have the proper administrative privileges assigned. If both servers are file servers and
Lesson 1
Managing Administrative Risks
a single user must be given access to files on both servers, the user must be given access to two separate accounts: one on each server Another example of a security boundary is the boundary between two Windows Server 2003 or Windows 2000 forests. As in the single-server example, an administrator from one forest has no administrative authority in the other forest. Users from one forest have no access to resources in the other.
Non-Examples: These Things Are Not Security Boundaries
Although domains within a forest have their own separate account databases, two things prevent these domains from being security boundaries and from providing isolation:
There are enterprise accounts in the forest that have rights and privileges in all domains in the forest. Examples of these groups are the Enterprise Admins group and the Schema Admins group. Because of the tight coupling between domains in the forest (that is, all domains in the forest trust all other domains in the forest), it might be possible, although it would be difficult, for a domain administrator to obtain elevated privileges in another domain.
Likewise, if administrative authority over organizational units (OUs) within a domain is assigned to a distinct group within an organization, this does not provide isolation. Enterprise Admins and Domain Admins can administer these OUs as well. Domains in a forest and OUs within domains can provide autonomy. That is, administration of each domain, OU, or both can be assigned to a distinct group of users. By agreement, those with the ability to administer these subunits, Enterprise Admins and Domain Admins, don t administer them. However, if isolation is required, you must either keep servers apart from Windows Server 2003 or Windows 2000 domain membership or deploy multiple forests. Both techniques can be used within an organization as needed.
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