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FORESTS, TREES, AND DOMAINS
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To this point, we have been discussing NT/2000 in the context of individual computers A group of NT/2000 systems can be aggregated into a logical unit called a domain Windows 2000 domains can be created arbitrarily by simply promoting one or several Windows 2000 servers to a domain controller Domain controllers (DCs) are secure storage repositories for shared domain information and also serve as the centralized authentication authorities for the domain In essence, a domain sets a distributed boundary for shared accounts All systems in the domain share a subset of accounts Unlike NT, which specified single-master replication from Primary Domain Controllers (PDCs) to Backup Domain Controllers (BDCs), Windows 2000 domain controllers are all peers and engage in multi-master replication of the shared domain information As a consequence of Windows 2000 s implementation of Active Directory, domains are no longer the logical administrative boundary they once were under NT Supradomain structures called trees and forests exist above domains in the hierarchy of AD Trees are mostly related to naming conventions and have few security implications, but forests demarcate the boundary of Windows 2000 directory services and are thus the ultimate boundary of administrative control Figure 2-2 shows the structure of a sample Windows 2000 forest
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Hacking Exposed Windows 2000: Network Security Secrets & Solutions
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A sample Windows 2000 forest
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Although we re glossing over a great deal of detail about Active Directory and Windows 2000 s new domain model, we are going to stop this discussion here in order to keep focused on the aspect of domains that are the primary target for malicious attackers: account information
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Scope: Local, Global, and Universal
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You ve probably noticed the continuing references to local accounts and groups versus global and universal accounts Under NT, members of local groups had the potential to access resources within the scope of the local machine, whereas members of global groups were potentially able to access resources domain-wide (more on domains in a minute) Local groups can contain global groups, but not vice-versa because local groups have no meaning in the context of a domain Thus, a typical strategy would be to add domain users (aggregated in a global group to ease administrative burden) to a local group to define access control to local resources For example, when a computer joins a domain, the Domain Admins global group is automatically added to the Local Administrators group, allowing any members of Domain Admins to authenticate to and access all resources on the computer Windows 2000 complicates this somewhat Table 2-5 lists the scopes relevant to Windows 2000 Depending on the mode of the domain (native versus mixed-mode, see References and Further Reading ), these types of groups have different limitations and behaviors
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The Windows 2000 Security Architecture from the Hacker s Perspective
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Scope Local
Description Intra-computer
Members May Include Accounts from any domain, global groups from any domain, and universal groups from any domain Accounts, global groups, and universal groups from any domain; domain local groups from the same domain Accounts from the same domain and global groups from the same domain Accounts from any domain, global groups from any domain, and universal groups from any domain
May Be Granted Access to Resources On Local computer only
Domain Local
Intra-domain
Only in the same domain
Global
Inter-domain
Any domain in the forest
Universal
Forest-wide
Any domain in the forest
Table 2-5
Windows 2000 Group Scopes
Trusts
Much like NT4, Windows 2000 can form inter-domain relationships called trusts Trust relationships only create the potential for inter-domain access, they do not explicitly enable it A trust relationship is thus often explained as building a bridge without lifting the tollgate For example, a trusting domain may use security principles from the trusted domain to populate access control lists (ACLs) on resources, but this is only at the discretion of the administrators of the trusting domain and is not inherently set up Trusts can be said to be one-way or two-way A one-way trust means that only one domain trusts the other, not vice versa Two-way trusts define two domains that trust each other A one-way trust is useful for allowing administrators in one domain to define access control rules within their domain, but not vice-versa Trusts can also be transitive or nontransitive Transitive trusts mean that if Domain A transitively trusts Domain B and Domain B transitively trusts Domain C, then Domain A transitively trusts Domain C
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