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Violating All the Principles with Multi-Role Servers
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If anything puts fear into a security expert, it is looking at the number of services running on a typical small business server. Most security experts (especially experts who are not well-versed in the needs and risks of small businesses) are very concerned about the attack surface exposed by all these services, and the cumulative effect of the lack of isolation. I once counted the number of servers one would need if one followed best practices as 12 servers in total. Obviously, this number of servers is not feasible for typical small organizations. Figure 15-5 shows eight sample roles that many multi-role servers perform. These include file, e-mail, database, Web, Active Directory, print, mobility, and of course the most famous role of that of everything else better known as the kitchen sink server.
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File Server Mail Server Database Server Web Server Directory Server Print Server Mobile Information Server Everything Else Server
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Typical Small Business Server
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Figure 15-5 The typical multi-role server: Everything including the kitchen sink.
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However, there is typically more risk to a small organization from misconfigurations for instance, someone setting up remote access incorrectly than there is from exposing more than one role on a given server. As a package deal, a correctly configured multi-role server with easy step-by-step build instructions is far more likely to be secure than a build-it-yourself, manually installed server in a small organization without dedicated and highly trained Information Technology (IT) personnel. For someone maintaining the system, that very same view is a concern about the correlation to updating duties and necessary reboots. While the typical Windows Server 2008 as examined by Microsoft s Jose Barreto on his blog at http://blogs.technet.com/josebda has fewer than 50 services running, the average Windows Server Code Name Cougar server counts more than 100 services running even before any LOB applications are placed on the computer, up from SBS 2003 s 67 normally running services. While each running service has had additional time
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Part III:
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Common Security Scenarios
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and effort devoted to appropriate permissions and rights (see 6, Services for more details on individual services), you must accept one fundamental fact when setting up a multirole server: you need maintenance windows for these types of servers. If the organization mandates zero downtime, a multi-role server is not acceptable.
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Acceptable Roles
Your job as an implementer of an acceptable secure solution is to determine which roles and duties are acceptable on that server and which ones are not. Review the applications that you intend to deploy for that network. For many organizations, the recommendation for any key LOB application based on a database platform is to not place it on the domain controller in Windows Server Code Name Cougar or the file server in the Windows Essential Business Server platform, but instead to have a dedicated server for that application. Typically it is easier to secure and to set proper NTFS file system permissions, and also easier to keep the memory use of the application in check. With virtualization, you should not think in terms of real hardware for these multi-server deployments. Placing many of these LOB applications on virtual servers is quite acceptable. Furthermore, many a network has been destabilized when a vendor installed a SQL Server database on a running server and innocently paved over whatever applications were already using the default SQL instance.
Server Components
The server role that will drive many server deployment decisions is the role of messaging. The big change in the 2008 era versus 2003 is the server role based model that Microsoft Exchange Server 2007 has taken. The roles include Mailbox Server, Client Access Server, Hub Transport Server, Unified Messaging Server, and Edge Transport Server. The Edge Transport Server s role handling all Internet mail flow for an organization demands that it be placed on a separate, stand-alone server to reduce the attack surface of the Exchange server. You can split all five roles over five different servers if you like, or combine four of them, but the Edge Transport Server role, as shown in Figure 15-6, is recommended to stay on a separate server. The exception to this rule is the Windows Server Code Name Cougar platform that because of special configuration is able to provide appropriate functionality on the same server. As you peruse the many articles about the deployment of this edge role, you will find many of them are absolute in their recommendations that the edge role not be on a domain as the most secure deployment configuration. Microsoft s own server role deployment documents wisely point out that not all businesses need this most secure configuration to still have an acceptably secured network. For a much more detailed overview of the needs for deploying Exchange Server 2007 in your organization, we recommend the following Microsoft Press companion books: Microsoft Exchange Server 2007 Administrator s Companion by Walter Glenn (2007) and Microsoft Exchange Server 2007, Administrator s Pocket Consultant by William Stanek (2007).
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