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SMTP Command TURN, ATRN, ETRN
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Exchange Server supports several additional commands. For a complete list of commands supported by Exchange Server, see Appendix A of the Exchange Server 2003 Transport and Routing Guide located at http://www.microsoft.com/technet/prodtechnol/ exchange/2003/library/extransrout.mspx.
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The SMTP filter can be configured to disable specific SMTP commands. When an SMTP server or client uses a command that is defined but disabled, the filter stops the command and closes that connection. For example, if you disable the VRFY command, ISA Server will block all SMTP connections that use this command. When a client uses a command that is not recognized by the SMTP filter, the connection is also denied. For example, the SMTP filter does not define the TURN command, so TURN commands will be blocked by the SMTP filter.
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Exam Tip If you disable or delete an SMTP command, that command will be blocked by ISA Server. If you get an exam question in which SMTP messages are not flowing through the ISA Server computer, and you are given some information about how the SMTP filter is configured, make sure that configuration is not blocking the message flow. By default, the SMTP filter allows all required SMTP commands.
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Each SMTP command also has a maximum length that specifies the number of bytes allowed for each command. If an attacker sends a command that exceeds the number of bytes allowed for the command, ISA Server drops the connection and prevents the attacker from communicating with the SMTP server. For example, the default maximum length for the RCPT TO command is 266 bytes. If an SMTP connection uses a longer RCPT TO command than this limit, the connection is dropped.
Note The SMTP Request for Comment (RFC) considers the AUTH command to be part of the MAIL FROM command. For this reason, the SMTP filter blocks MAIL FROM commands only when they exceed the length of the MAIL FROM and AUTH commands issued (when AUTH is enabled). For example, if you specify the maximum length of MAIL FROM as 266 bytes and AUTH as 1024 bytes, the message will be blocked only if the MAIL FROM command exceeds 1290 bytes.
If an SMTP command is blocked because it violates one of the SMTP filter s conditions, the blocked message will only be logged when the SMTP Filter event alert is enabled. This alert is disabled by default.
How to Configure the SMTP Application Filter
The SMTP filter is installed and enabled by default. When you publish an SMTP mail server, or enable an SMTP access rule, all SMTP messages are filtered using the default policy. To modify the default configuration of the SMTP filter, complete the following procedure: 1. In the ISA Server Management Console, click Add-ins. 2. In the Details pane, on the Applications Filters tab, double-click SMTP Filter. 3. On the SMTP Commands tab, as shown in Figure 9-3, click the applicable command, and then click Edit.
Lesson 1
Configuring ISA Server to Secure SMTP Traffic
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F09im03
Figure 9-3
Configuring the SMTP application filter
4. In the SMTP Command Rule dialog box, shown in Figure 9-4, you can disable the command by clearing the Enable SMTP command check box.
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Figure 9-4
Configuring the SMTP command rule
5. To modify the maximum length for the SMTP command, type the maximum length of the command line (in bytes) for the command in the Maximum Length field. 6. To add an SMTP command to the filter, on the SMTP Commands tab, click Add and enter the command name and maximum length of the command line.
How to Implement SMTP Message Screener
The SMTP Message Screener works with the SMTP filter to intercept and filter SMTP traffic. The Message Screener provides additional functionality by inspecting the SMTP message contents and enabling the filtering of unwanted and malicious e-mail.
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