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Header firewalls
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Adding X-headers to message headers is usually a good thing because it allows administrators and users to trace the path of messages and see what actions occurred as the message made its way from server to server. However, you might not want to expose information about your messaging infrastructure such as the name of email servers to the outside world, as this information might be of use to hackers. It s also possible that a spammer
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could attempt to get messages past your defenses by inserting headers that seem to testify to their authenticity. Exchange therefore supports header firewall functionality to strip X-header information from messages as they pass through a connector. The header firewall implemented in Exchange 2010 uses Active Directory permissions to know whether header information should be removed or left intact. First, let s review the Active Directory permissions that exist on a send connector. We can retrieve the permissions with a command like this one:
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Get-SendConnector Identity 'To Internet via Smart Host' | Get-AdPermission | Select User, ExtendedRights, Deny | Format-Table -AutoSize
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User ---NT AUTHORITY\ANONYMOUS LOGON CONTOSO\Exchange Servers CONTOSO\Exchange Servers CONTOSO\Exchange Servers CONTOSO\Exchange Servers CONTOSO\Exchange Servers MS Exchange\Partner Servers MS Exchange\Hub Transport Servers MS Exchange\Hub Transport Servers MS Exchange\Hub Transport Servers MS Exchange\Hub Transport Servers MS Exchange\Hub Transport Servers MS Exchange\Edge Transport Servers MS Exchange\Edge Transport Servers MS Exchange\Edge Transport Servers MS Exchange\Edge Transport Servers MS Exchange\Edge Transport Servers MS Exchange\Externally Secured Servers MS Exchange\Externally Secured Servers MS Exchange\Legacy Exchange Servers MS Exchange\Legacy Exchange Servers
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ExtendedRights -------------{ms-Exch-Send-Headers-Routing} {ms-Exch-Send-Headers-Organization} {ms-Exch-SMTP-Send-Exch50} {ms-Exch-Send-Headers-Forest} {ms-Exch-Send-Headers-Routing} {ms-Exch-SMTP-Send-XShadow} {ms-Exch-Send-Headers-Routing} {ms-Exch-SMTP-Send-XShadow} {ms-Exch-Send-Headers-Forest} {ms-Exch-Send-Headers-Organization} {ms-Exch-SMTP-Send-Exch50} {ms-Exch-Send-Headers-Routing} {ms-Exch-Send-Headers-Routing} {ms-Exch-SMTP-Send-XShadow} {ms-Exch-Send-Headers-Forest} {ms-Exch-Send-Headers-Organization} {ms-Exch-SMTP-Send-Exch50} {ms-Exch-Send-Headers-Routing} {ms-Exch-SMTP-Send-Exch50} {ms-Exch-SMTP-Send-Exch50} {ms-Exch-Send-Headers-Routing}
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Deny ---False False False False False False False False False False False False False False False False False False False False False
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The output shown here is truncated to focus on the most important permissions for our discussion, and the permission that we are most interested in is listed first. Exchange uses the NT Authority\Anonymous Logon account when it makes unauthenticated connections to external servers. The other accounts that are listed are used for connections within the organization or with Edge servers that are secured with Transport Layer Security (TLS). To remove header information from messages that are going to external servers, we need to deny the ms-Exch-Send-Headers-Routing extended right to the account. This is done with a command like this:
Add-AdPermission User 'NT Authority\Anonymous Logon' ExtendedRights 'ms-Exch-SendHeaders-Routing' Deny
Exchange anti-spam agents
After you add the new deny permission, you have to restart the Microsoft Exchange Transport service on all hub transport servers that are configured to use the send connector to force them to read in the new permission and respect it. The only information about a server that is retained is the name of the hub transport server that transmitted the message across the send connector. This is a very simple discussion about how and why you would enable a header firewall. The debate can become a lot more complicated as you factor in receive connectors and dealing with messages from legacy Exchange 2003 organizations (Exchange 2007 servers are not deemed to be legacy in this context because they support header firewalls).
TechNet has a good treatment of the topic at http://technet.microsoft.com/en-us/library /bb232136.aspx .
Connection filtering
The Connection Filter agent examines the IP addresses presented by remote SMTP servers that initiate SMTP sessions with Exchange to decide whether to accept the message that the remote server wishes to send. Filtering is applied to all connections that come in from unauthenticated SMTP servers. The Connection Filter agent fires when the OnConnect transport event occurs and extracts the underlying IP address that initiates the SMTP session to compare it against IP block lists (to decide whether to drop the session) and IP allow lists (to accept the session). If the IP address is on a block list, Exchange continues to accept data until all recipient information (the RCPT TO data) is received so that it can check if any of the intended recipients are marked to bypass connection checking. You might define bypass recipients to receive spam so that you can analyze the spam and be able to refine your defenses against attack. Bypass recipients are defined with the SetIPBlockListProvidersConfig cmdlet (or through EMC). For example:
Set-IPBlockListProvidersConfig -BypassedRecipients 'Tony.Redmond@contoso.com', 'Kim.Akers@contoso.com'
The checks that the Connection Filter agent executes are determined by the IP Allow List configuration and IP Block List configuration, which you can view with the GetIPAllowListConfig and Get-IPBlockListConfig cmdlets. For example, the settings shown here indicate that the Connection Filter agent is examining external connections but not internal connections. You can also see the messages sent as nondelivery reports (NDRs) in response to blocked messages. You can customize these messages with the Set-IPAllowListConfig and Set-IPBlockListConfig cmdlets:
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