Securing Exchange 2007 in .NET

Print UPCA in .NET Securing Exchange 2007

Securing Exchange 2007
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Figure 12-5 Reviewing the installed server roles
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Figure 12-6 Confirming the service changes to be applied
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Microsoft Exchange Server 2007: A Beginner s Guide
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Figure 12-7 Listing the ports that will be secured
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The next section, Registry Settings, doesn t secure the registry; it makes changes to several registry values that secure the following: Server Message Block (SMB) security signatures LDAP signing NTLM authentication levels for inbound and outbound communication
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The next section, Audit Policy, determines which system events should be audited These can include the success and/or failure for: Logons Account management Directory service access Object access
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Securing Exchange 2007
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Policy changes Process tracking System events
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NOTE Should you audit object access, you ll need to configure which files, folders, registry keys, printers, and certificates will be audited and for whom You can get started with Microsoft Knowledge Base article 310399 The SCW allows you to choose to audit either the success only or the success and failure of events However, in some cases, even if you choose just success auditing, the SCW will still audit failure events for logon and system events The final section, Internet Information Services, performs three functions: removing unnecessary or undesirable Web service extensions (shown in Figure 12-8), determining
Figure 12-8 Restricting IIS Web service extensions with SCW
Microsoft Exchange Server 2007: A Beginner s Guide
the virtual directories that should be retained (be careful here this can have adverse effects if you remove needed virtual directories!), and whether the IIS server will support anonymous access At the end of the wizard, you will save the policy and have the option to apply the policy then or later by re-running the wizard (remember, one of the initial options is to apply an existing policy) You will want to consider creating separate policies for each server role (should you have multiple servers), test the functionality of your Exchange servers once the policy has been put in place, and lastly be aware that you can remove the policy settings within the SCW as easily as you applied it
SECURING EXCHANGE SERVER ROLES
Each of the server roles has its own security needs, from physical placement, availability to/from the Internet, use of SSL/TLS, use of authentication, etc This section will address each of the roles separately, providing information on the possible security measures you can implement
Securing the Client Access Role
This role has many exposure points you need to concern yourself with Just listing the various clients that can utilize this role should get your wheels turning: Outlook Web Access (OWA) File server resource access via OWA SharePoint resource access via OWA Outlook Anywhere ActiveSync Autodiscover service Availability service Offline Address Book (OAB) distribution POP3 IMAP4 Interaction with other server roles
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Securing Exchange 2007
Starting to see how this is critical Because there are so many ways to connect to the Client Access role, this role has more potential exposure to security threats than any of the other four roles The good news is that because all of these services provided by the Client Access role are Web-based, they can be secured using either SSL or TLS While in previous versions of Exchange, Web-based services were placed in the perimeter network, the Client Access role should be placed on the internal network and accessed via either ISA Server or protected behind a firewall
Web-Based Client Access Services
The following services provided by the Client Access role are all Web-based and are, therefore, capable of securing using SSL within the IIS Manager: OWA Outlook Anywhere ActiveSync OAB distribution Autodiscover
All of these services will require credentials, so implementing SSL is imperative for the security of the sessions You can utilize an ISA server to securely publish any of these services and not require SSL to be implemented on the Exchange server itself, but instead on the ISA server Should you wish to implement SSL on the Exchange server, or if you do not have an ISA server, you can read more about implementing SSL in 8 in the section titled Installing an SSL Certificate
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