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Before disabling the ETRN command, you need to put some thought into whether disabling it is the most appropriate choice The command is a more secure enhancement of the TURN command It is designed to assist hosts that are not permanently connected to the Internet The mail for the occasionally connected hosts is accumulated at another SMTP server, and, when the host connects to the Internet, the host sends an ETRN command that instructs the storing SMTP Server to deliver all the stored mail If the given SMTP server does not have any stored messages, it does not reply to your SMTP server and the SMTP connection times out In most cases, ETRN does not pose a significant risk, but at least one exploit has used ETRN for a DoS service attack in the past.

1. 2.

2 If you do not use ETRN for anything, then to err on the side of caution, I recommend you disable it For Sendmail, simply change your confPRIVACY_FLAGS to Listing 7-21 Listing 7-21 Disable ETRN in Sendmail define(`confPRIVACY_FLAGS', `novrfy,noexpn,noetrn') Listing 7-21 now shows all the SMTP commands I have discussed (VRFY, EXPN, and ETRN) in a disabled state In Postfix you cannot entirely disable ETRN, but you can reduce the any potential threat by specifying what domains are able to use the ETRN command Add the option in Listing 7-22 to maincf, and reload Postfix to enable this Listing 7-22 ETRN in Postfix smtpd_etrn_restrictions = permit_mynetworks, hash:/etc/postfix/allow_etrn, reject This command tells Postfix to allow ETRN commands from two sources: any networks listed in the main.

cf config option $mynetworks, denoting any networks that Postfix trusts for purposes such as relaying, and any domains or IP addresses listed in a Postfix access database called allow_etrn in /etc/postfix The final statement, reject, tells Postfix to reject any other attempts to use ETRN..

s You can create Postfix access databases using the postmap command. You can read about them in Tip

http://www.securityfocus.com/bid/904/info/

Open MainMenu.xaml.cs. Add an event handler for when the MainMenu is loaded in the MainMenu constructor: public MainMenu() { InitializeComponent(); this.Loaded += new RoutedEventHandler(MainMenu_Loaded); }

In addition to the flags I have discussed, Sendmail also has a number of other useful flags for the confPRIVACY_FLAGS option. In Table 7-2 you can see a list of the ones I think are useful and recommend you set to increase the integrity and security of your Sendmail server. Table 7-2. Additional Sendmail Privacy Flags

authwarnings goaway needmailhelo nobodyreturn noreceipts noverb restrictexpand restrictmailq restrictqrun

Inserts a header, X-Authentication-Warnings, into any mail it suspects is not authentic. This is usually on by default in most Sendmail installations. Combines the functions of novrfy, noverb, and noexpn and also includes noreceipts, needmailhelo, needvrfyhelo, needexpnhelo, and nobodyreturn. A remote server must issue a HELO before sending mail. Does not return the original body of a message when it is bounced. Disables DSN (SUCCESS return receipts). Disables the SMTP VERB command. Tells Sendmail to drop privilege when a non-root user runs sendmail -bv to protect ./forward files, aliases, and :include: files from snooping. Restricts who can examine the mail queue to root or the queue owner. Restrict who can run or process the mail queue using the -q option to root or the queue owner.

In MainMenu_Loaded() add the following code: void MainMenu_Loaded(object sender, RoutedEventArgs e) { this.cmdStackPanel.Click += new RoutedEventHandler(cmdStackPanel_Click); }

I recommend setting your privacy options to the most secure possible. Listing 7-23 shows my recommended setting. Listing 7-23. Recommended Sendmail confPRIVACY_FLAGS Options define(`confPRIVACY_FLAGS', `goaway,restrictmailq,restrictqrun')

s If you are going to restrict access to the mail queue, ensure you turn off read permissions for ordinary Tip users on your logs. You can extract the same information via grepping your logs as you can reading the mail queue.

Sendmail also offers users the ability to run programs using the prog mailer function. This poses some risks if users are able to execute programs or code that could allow exploits or threaten the integrity of the system. The solution to this issue is the introduction of smrsh, the Sendmail restricted shell. The smrsh shell was designed as a replacement for the standard shell, sh, to prevent people from misusing the Sendmail |program functions by limiting those programs and shell functions that can be executed. If you specify the smrsh shell, then Sendmail can execute only those programs contained in the smrsh

Now create a method to be called when cmdStackPanel is clicked: void cmdStackPanel_Click(object sender, RoutedEventArgs e) { PageNavigator.LoadPage(new Layout.StackPanelTest()); }

directory (by default /usr/adm/sm.bin). It limits the use of shell commands to exec, exit, and echo. The smrsh shell also disables the use of the following characters when executing programs: ' < > ; $ ( ) \r \n