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Security Options for Improving Network Security
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Template Location User Rights User Rights User Rights Description This setting determines which users and com puters can access this computer. By default, all domain users have the right to add 10 computers to a domain. This setting includes several logon rights, such as the right to log on locally, and the opposite, the right to deny logon locally, for example. This setting controls how secure channel data crosses the network. You want the most secure, but you must sometimes relax settings to get connectivity. For example, downlevel comput ers might not be able to communicate using the same security settings as Windows Server 2003. This setting determines which types of anony mous connections and anonymous access are allowed. Because the new password hash for the change is not stored, a computer that can use only LM will not be able to authenticate. This setting determines which versions of the LM protocol are accepted. The insecure version, LM, is not allowed by default; instead, comput ers must use NTLM, NTLMv2, or Kerberos. This setting determines whether message integ rity, confidentiality, and encryption are required.
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Setting Access this computer from the network Add workstations to a domain Logon rights (multiple settings) Digitally encrypt or sign secure channel data (multiple settings)
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Allow anonymous (multiple settings) Do not store LAN Manager hash value on next password change LAN Manager authentica tion level
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Security Options Security Options Security options
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Minimum Sessions security (two settings)
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Implementing Secure Network Administration Procedures 11-13
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Applying the Principle of Least Privilege
One of the most important concepts that should guide your development and imple mentation of security policy is the principle of least privilege. Using this principle means that no employee and no user of information systems has more privileges or access to information and resources than they need to do their job. This principle includes removing privileges and access when employees change jobs within the organization or when they leave the company. The principle of least privilege also means that visi tors to the organization or to any information resources such as the public, contrac tors, temporary workers, partner representatives, and so on should be treated in the same manner. No one, and that includes system administrators and IT workers, should have any more access or rights than they need to do their job. There are many ways to implement and follow this maxim. The ways can be catego rized according to those that are possible using security templates and those that require other mechanisms to implement. This subject is broad, and the following lists are by no means meant to be comprehensive. Instead, they are meant to teach the paradigm.
Security Template Least Privilege Opportunities
Develop a strong password policy to keep unauthorized individuals off systems. Assign user rights sparingly. Reduce rights, especially access and logon rights, as much as possible. Set different rights on computers with different roles. Use security options to block access and restrict activity. Use file and Registry ACLs. Use the Restricted Groups section to force and limit membership in sensitive groups. Use the Services section to disable services and restrict who can manage them. Develop a baseline plan for every computer role and implement using templates that are imported into Group Policy Objects (GPOs) on representative organiza tional units (OUs). Apply a comprehensive auditing strategy.
Nonsecurity Template Least Privilege Opportunities
Group users by role so that privileges and permissions can be granted by role. Configure ACLs for files, folders, Registry keys, directory objects, and printers to allow only the exact access any group of users needs. Physically protect servers. Allow access only to authorized personnel and screen this authorization.
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11
Managing Network Security
Review audit logs and other logs looking for needs to restrict further access. Use Web proxies to limit user access to external resources. Use firewalls to limit access to internal networks.
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