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Always use administrative workstations for administration. These stations are locked down and protected, so there is less risk of introducing malware or of exposing sensitive systems or information about sensitive systems than when using unprotected workstations. Furthermore, accounts with administrative privi leges should be used only to log on to computers that have known trust states. Never reduce security for convenience. Security might mean extra work is involved in the administrative process, but security is established for a reason and should not be reduced without serious consideration. The competing pressures of demands for increased performance, efficiency, ease of access, and many others can tempt the administrator to change security practices. For example, persistently storing passwords for Web applications might be convenient, but it also introduces a new threat to the network. When possible, take systems offline to troubleshoot them. If you cannot take the system offline, take steps to reduce the risks associated with changes that might be made or tools that might be used to troubleshoot these systems. Never log on to a computer that you believe might have been compromised while it is attached to the network. You cannot trust a computer that has been compromised. Do not add troubleshooting tools to servers. Where possible, use external tools. Where tools must be loaded directly on the server, remove tools after prob lems are resolved. Use administrative tools that can be secured, and use their security fea tures. If tools cannot be secured, use additional security practices to secure their operations. For example, use IPSec to secure telnet sessions.

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A few months ago, I was doing some work for a public school system. The LAN administrator was concerned because it appeared as if a student had obtained his password and used it to attempt to change a grade. The administrator couldn t fig ure out how the student did this because he never wrote his password down or used it when students were present. When questioned, the administrator told me that he had to frequently work on the student lab computers because students are constantly attempting and sometimes succeeding to add software, change settings, and so forth. To make some changes, he had to log on using his administrative account. At this point, his face brightened and then twisted with a strange smile. Keystroke logger, he remarked. Later that week, the administrator told me that when he asked the student why he used a keystroke logger and recorded the administrator password, the student confessed and produced the device used. The administrator now monitors the lab computers for evidence of tampering and manages them remotely.

It s been noted that there are two primary technologies that the .NET Framework pro vides for implementing a communications layer in distributed applications, .NET XML Web Services and .NET Remoting. With respect to the client code, there are many similarities to using either technology because of the nature of the distributed communications. For instance, both typically require an additional machine to host a separate application. Because of latency inherent in network communications, issues regarding responsive user interfaces need to be addressed. And, as with all applica tions, asynchronous invocations may be necessary to enhance usability. This chapter will address remote method invocations and event management in .NET Remoting.

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Example (JScript)

Exam objectives in this chapter:

Many administrative tools are snap-ins for the Microsoft Management Console (MMC). Other administrative tools are special administrative programs designed for a specific program or service. Still others are command-line tools that are either installed by default, provided as part of the support tools collection on the Windows Server 2003 installation disk, or provided as part of the Windows Server 2003 Resource Kit. Part of securing administrative practices is to secure the use of administrative tools. This con sists of making sound choices in the tools that are used, in using their security features appropriately, and in adding security where necessary. The following sections describe the guidelines for securing the use of administrative tools. Secure Administrative Tools In addition to specifying practices for securing individual tools, you should take the following precautions:

Implement one-way methods by using the OneWay attribute. Call a remote method asynchronously. Implement a callback. Create and fire events. Implement an event handler for events of the remote object.

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