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X-MS-Exchange-OrganizationSenderIdResult
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Edge Transport and Messaging Security
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Besides X-header fields, Header Firewall also controls Routing headers. Routing headers include information about all messaging servers used to deliver the message.
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CONFIGUrING hEaDEr FIrEWaLL
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In some situations you need to implement Header Firewall to prevent someone from creating a message that will spoof X-headers and thereby imitate an Exchange Transport server in order to have their messages accepted as legitimate by the receiving server. This is especially crucial if your organization does not include a smart host that removes these headers. Header Firewalls are configured by assigning Active Directory permissions on the respective Send connector or Receive connector. A dedicated ExtendedRight attribute and Deny permission is used to control enabling or disabling a Header Firewall. The following principle applies:
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If Deny is enabled (or True), the Header Firewall is turned on for the specified area and headers are removed. If Deny is disabled (or False), the Header Firewall is turned off and the headers are preserved by the connector.
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By default, no Send or Receive connector is configured for Header Firewall. In a situation where you use an Edge Transport server, the X-header is overwritten anyway when a message enters the organization. But for outbound messages, Routing headers might disclose too much information about your company. For example, the name of any internal Hub Transport server that processes the message is shown in the Routing header. Several Extended Rights control Header Firewalls on Send connectors and Receive connectors. Table 7-3 provides an overview of possible Extended Rights.
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TABLE 7-3 Connectors and Extended Rights for X-Header Configuration
CONNECTOR
EXTENDED RIGHT
DESCRIPTION
Receive connector
ms-Exch-Accept-HeadersForest ms-Exch-Accept-HeadersOrganization Ms-Exch-Accept-HeadersRouting
Configures Header Firewall on X-MS-Exchange-Forest . . . headers Configures Header Firewall on X-MS-Exchange-Organization . . . headers Configures Header Firewall on Resent- . . . and Received: headers Configures Header Firewall on X-MS-Exchange-Forest . . . headers Configures Header Firewall on X-MS-Exchange-Organization . . . headers Configures Header Firewall on Resent- . . . and Received: headers
Send connector
Ms-Exch-Send-HeadersForest Ms-Exch-Send-HeadersOrganization Ms-Exch-Send-HeadersRouting
Implementing Edge Transport Server
ChapTEr 7
To configure Header Firewalls, you can either use EMS or directly access the Permissions tab of the connector s Advanced Security Settings using ADSIEdit, as shown in Figure 7-5. You can see Advanced Security Settings of the Send connector on the Edge Transport server that connects to the Internet. Because Deny is set for Anonymous Logon on Send Routing Headers permission, all internal message servers are removed from the routing path.
FIGURE 7-5 Configuring Header Firewall using ADSIEdit
When using ADSIEdit in Active Directory to configure permissions, remember that you can configure Edge Transport Receive connectors only directly on the Edge Transport server. Thus you can only configure Send connectors using ADSIEdit in Active Directory, for configuring Edge Transport Receive connectors you need to use EMS on the Edge Transport directly, as Receive connectors are not synchronized to Active Directory with EdgeSync. Configuring Header Firewall using EMS is not trivial many groups are involved and you have to configure the right group to turn Header Firewall on or off. The best approach is to look at your existing connectors to identify the groups you need to configure. The following cmdlet is an example to show you the Extended Rights of a Receive connector:
Get-ReceiveConnector <ReceiveConnectorName> | Get-ADPermission | ft user, deny, ExtendedRights
To configure Header Firewall in your scenario you just need to change the permissions on the respective Receive or Send connector. For example, let s turn on Header Firewall for Routing headers on the Send connector to the Internet for all non-authenticated target servers. You can configure this using the following cmdlet on the Send connector that sends messages to the Internet:
Add-ADPermission -id <SendConnectorName> -User NT Authority\Anonymous Logon -ExtendedRights Ms-Exch-Send-Headers-Routing -Deny
ChapTEr 7
Edge Transport and Messaging Security
Remember that after you configure the permissions, you need to restart the Microsoft Exchange Transport service on all Hub Transport servers that are configured to use the Send connector so that Header Firewall will take immediate effect. You can verify whether Header Firewall is turned on by enabling verbose logging on the Receive connector in EMC or using the ProtocolLoggingLevel Verbose parameter in the Set-ReceiveConnector cmdlet. You will now receive a detailed protocol log in the <Exchange_ Install_Path>\TransportRoles\Logs\ProtocolLog\SMTPReceive folder. In the current log file, you will find the following entries for each SMTP session that has Header Firewall turned off:
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