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The first options, -l and -L, list the fingerprints and the public-key parameters of the keys stored in the agent, respectively. The -d option allows you to remove a key you previously added to the ssh-agent. Enter the following: puppy$ ssh-add -d /root/.ssh/id_rsa You can also remove all keys from the agent by using the -D option. The next two options allow you to lock and unlock the agent with a password to prevent anybody from making any changes without the password. The -x option locks the agent, and the -X option unlocks the agent. You will be prompted for a password for both options. The last option, -t, is the same as the -t option for the ssh-agent command, which sets the life span of the keys in the agent in seconds.

The ssh-agent also allows authentication-agent forwarding. Authentication-agent forwarding means that remote systems can use a local trusted ssh-agent daemon to perform authentication. To do this, you need to ensure either the -A command line option is issued or the ForwardAgent option in the ssh_config configuration file is set to yes. Let s see an example. 1. You have a trusted secure system running ssh-agent on it called puppy. 2. You have two other systems, kitten and duckling. Both kitten and duckling have your public key in their authorized_keys file. 3. You have a terminal session on puppy, and you ssh to kitten. The ssh-agent takes care of the authentication, and you sign on. You do what you need to on the kitten system. 4. Now you want to do something on duckling, so you need to ssh over there. But your private key is stored on the ssh-agent on puppy, and the kitten system does not have a copy of your private key. 5. But you have AgentForward enabled on the kitten and duckling systems. Your ssh session has recognized this, and when you connect to duckling it connects to the ssh-agent on puppy and passes your private key through to the duckling system. Thus, you are able to be authenticated to the duckling system.

8. 9.

s Caution This has risks, though. Never enable agent forwarding on a system where you do not control

root or do not trust the system. This is because your private key and passphrase are now in memory of the systems you have agent forwarded to, and the root user can pluck them from the memory of the system.

The last area of OpenSSH you will look at in this section is the sshd daemon itself. To allow remote connections via ssh to your system, you need to have the sshd daemon running and by default the TCP port 22 open (you can override this port in the sshd_config file, which I will discuss shortly). The sshd daemon is usually started when your system is started through an init script.

Press F5 to run the application. Click the Example 4 Edit Strongly Typed link (this is hard-wired to take you to a specific film).

s You can find examples of init scripts for Red Hat (which will work for Mandrake, Yellow Dog, and Tip

You can also start it from the command line; Listing 3-39 shows this. Listing 3-39. Starting the sshd Daemon puppy$ sshd -p 22

Listing 3-39 starts the sshd daemon, and the -p option tells the daemon to bind itself on TCP port 22. You can also specify multiple ports after the -p option to have sshd listen on more than one port. Table 3-14 describes some of the other command-line options available for sshd. Table 3-14. sshd Command-Line Options

10. Delete the title of the film and click Submit. You should see a screen similar to Figure 13-8.

Controls inbound and outbound delivery rates by limiting the number of concurrent processes Controls how many messages are delivered simultaneously to a local recipient Limits the number of recipients the SMTP daemon will take per delivery Error count Error count Pause that Postfix takes between reporting errors in seconds

1000 10 20 1