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The first two options, -c and -s, will output the commands for setting the environmental variables in the form of csh and Bourne shell commands. The next option, -k, will kill the running ssh-agent daemon based on the process ID contained in the SSH_AGENT_PID environmental variable. Enter the following: puppy$ ssh-agent -k The -t option allows you to set a lifetime for the keys you add to ssh-agent in seconds. After that period the key will expire and be removed from RAM. You can override this using the ssh-add command. The last option, -d, is debug mode that will start the ssh-agent but not fork it to the background. Now that you have ssh-agent running, you need to add keys to it. You do this using the ssh-add command. Listing 3-38 shows the ssh-add command. Listing 3-38. Adding Keys to ssh-agent Using the ssh-add Command puppy$ ssh-add If you run ssh-add without specifying a particular key file to load, the command will load id_rsa, id_dsa, and identity from the .ssh directory of the current user. If these keys require a passphrase, then you will be prompted to enter that phrase to successfully add that key to the cache. You can use additional command-line options with ssh-add (see Table 3-13). Table 3-13. ssh-add Command-Line Options

Many enterprises run an SMTP gateway or relay on the border of their network, usually housed in a DMZ with a firewall protecting it, to provide front-line mail services on the Internet. The SMTP gateway sends and receives all mail for the enterprise but does no local delivery of mail; rather, it relays it onto other mail servers that handle internal mail. This frontend mail server provides another layer of security for your network and often also performs spam filtering or antivirus functions. See Figure 7-1.

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As Sendmail is only relaying mail onward (or discarding it in the case of some spam- and virus-infected items), you are able to tightly chroot Sendmail within a jail on the gateway system because it does not need to write mail to local users. As I discussed elsewhere, the chroot jail protects your system from penetrations by locking the hacker into a jail where they can access the resources only in that jail and should be unable to take further action to compromise your system. With Sendmail, you achieve this by adding a user that Sendmail will run as who has limited privileges.

s Caution The chroot setup for Sendmail is quite complicated; you will need to carefully test that all the

1. Trim and wash the spinach. Cook in a small quantity of boiling water until wilted. Drain, cool under running water, and drain again. Press excess water out of the spinach, but do not squeeze too dry. 2. Heat the oil in a pan. Add the fat and render it. Remove and discard the cracklings (solid pieces remaining from the fat). 3. Add the spinach, pine nuts, and raisins. Saut until hot. 4. Season with salt and pepper.

The first step in setting up your chroot jail is to create a directory structure. You need to specify a root directory for your chroot jail. I often use /chroot with subdirectories for all the applications chrooted below this directory. In this case, /chroot/sendmail is the Sendmail chroot root directory. Create the directories in Listing 7-1 underneath the /chroot/sendmail directory.

Listing 7-1. chroot Directory Structure /dev /etc /etc/mail /lib /lib/tls /tmp /usr /usr/bin /usr/sbin /usr/lib /usr/lib/sasl2 /var /var/run /var/spool /var/spool/mqueue Next you will want to add a user for Sendmail to run as. I usually call this user sendmail and add it to the mail group. Enter the following: puppy# useradd -u 501 -g mail -s /sbin/nologin -d /dev/null sendmail Then enable the RunAsUser setting in sendmail.mc, and change it to the user you have created to run the Sendmail daemon. The following shows this: define(`confRUN_AS_USER',`sendmail') Re-create your sendmail.cf file to enable this.

Now you need to populate these directories with some of the files you will need. You can start with the /chroot/sendmail/etc directory. You need to copy the following: aliases aliases.db passwd group resolv.conf host.conf nsswitch.conf services hosts localtime Once you have copied in your passwd and group files, you should edit these down to just the users and groups you need to run Sendmail. My passwd file contains the following:

root:x:0:0:root:/root:/bin/bash bin:x:1:1:bin:/bin:/sbin/nologin daemon:x:2:2:daemon:/sbin:/sbin/nologin mail:x:8:12:mail:/var/spool/mail:/sbin/nologin mailnull:x:47:47::/var/spool/mqueue:/sbin/nologin sendmail:x:501:501::/dev/null:/sbin/nologin The group file contains the following: root:x:0:root bin:x:1:root,bin,daemon daemon:x:2:root,bin,daemon mail:x:12:mail,sendmail mailnull:x:47: Finally, you need to put in your Sendmail configuration files. Simply copy the entire contents of your /etc/mail directory and all subdirectories into the /chroot/sendmail/etc/ directory. As much as I would like to say there is an easier way to do this mount or links, for example there is not, and both these methods punch a hole in your chroot jail that could allow an attacker to get out. So you need copy these files from the source directory to the target directory. When you are updating databases and files, ensure that you update the files in the chroot jail.

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