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Then restart syslog or syslog-NG, which should create a log device in the dev directory that will allow Postfix to log to your syslog daemon. Finally, if you are going to be using SASL, then you will need to copy the smtpd.conf file and all the required SASL mechanisms and plug-ins you intend to support. You can do this simply by copying all the files in the /usr/lib/sasl2 directory to /var/spool/postfix/usr/lib/sasl2. If you are using saslauthd, you also need to adjust the location of your saslauthd mux file to within your chroot jail. See 8 for how to do this. Now that you have a chroot jail for Postfix, you need to configure Postfix itself to use that jail. The Postfix daemons are controlled by the master.cf file, which is usually located in the /etc/postfix/ or /etc/mail directory. Open this file, and review its contents. The start of the file contains documentation explaining the daemons controlled from this file and their settings. After this documentation you will find a list of daemons that resembles Listing 7-6. Listing 7-6. Postfix master.cf File # service # smtp #628 pickup cleanup qmgr #qmgr rewrite bounce defer flush proxymap smtp relay type inet inet fifo unix fifo fifo unix unix unix unix unix unix unix private (yes) n n n n n n n unpriv (yes) chroot (yes) y y y y y y y y y y y y y wakeup (never) 60 300 300 1000 maxproc (100) 1 0 1 1 0 0 0 command + args smtpd qmqpd pickup cleanup qmgr nqmgr trivial-rewrite bounce bounce flush proxymap smtp smtp

Figure 5-77 You can insert a built-in equation and then edit it. When the equation is selected, the Equation Tools Design tab shown in Figure 5-78 will display as well. The tab includes numerous symbols and math structures.

# -o smtp_helo_timeout=5 -o smtp_connect_timeout=5 showq unix n y showq error unix y error local unix n n local virtual unix n n virtual lmtp unix y lmtp You should see that each daemon is followed by several columns of configuration switches. A hyphen (-) in a column indicates that Postfix will use the default setting for that setting, which is specified in the second commented line beneath the description of what each column does. For example, the default for unpriv is y (for yes). The most important columns are unpriv and chroot. In the chroot column, make sure all the daemons except those that use local or virtual services (check the last column under command to confirm this) are set to y. Then check that all the entries underneath unpriv are set to either - or y again with the same exceptions: the local and virtual services. Now reload Postfix by entering the following: puppy# postfix reload Check your mail log file (usually /var/log/maillog) for the results of the reload; if it reports that Postfix reloaded without incident, your system is now running Postfix chrooted!

I will now show you some options for securing Sendmail and Postfix, including hiding your banner, disabling some SMTP commands, setting the privacy flags for Sendmail, and using smrsh with Sendmail, amongst other issues. A large portion of the following sections focus on Sendmail rather than Postfix because Postfix provides built-in protection or turns on or off some security-related options by default and does not require you to manually do this. I will identify where any manual intervention for Postfix is required.

When you set a property of an object in ASP.NET such as Width on a TextBox, you would usually write something like this: <asp:TextBox Width= 300" Runat="server" /> Behind the scenes, the Width value is retained in a private field. If you were to retrieve the Width property, it would be the same as when it was first set. However, when working with dependency properties, this is not necessarily true.

Your MTA s banner is one of the few occasions when it does not pay to advertise. One of the easiest ways for attackers to customize their assaults on your MTA is by Telneting to port 25 on your system and watching your MTA s banner tell the attackers what application it is and its version. So I will take you through the steps required to change Sendmail and Postfix s banner to something that does not broadcast these details.