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ssh-agent and Agent Forwarding
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OpenSSH also comes with a set of tools for managing and caching keys. The primary tool I will use in this example is called ssh-agent. It runs as a daemon and allows you to cache keys in RAM so that you can use the keys for a variety of purposes, such as in a script or in an automated process, and have to enter only the passphrase for the key once. You first need to start the ssh-agent daemon and then add keys to it using an additional tool called ssh-add. This may seem insecure to you. What is to stop the user bob from using a key the root user has added to the ssh-agent daemon Well, the ssh-agent daemon runs on a per-user basis. Thus, if the root user started an ssh-agent and added keys to it, and then user bob started another ssh-agent and added keys to it, these would be separate processes and the keys in one process are not accessible in the other. Additionally, the ssh-agent is accessible only locally through a local socket. It is not directly connected to your network (though you can read about authentication agent forwarding next). Listing 3-37 shows you how to start ssh-agent. Listing 3-37. Starting the ssh-agent Process puppy$ ssh-agent SSH_AUTH_SOCK=/tmp/ssh-UITsiD7123/agent.7123; export SSH_AUTH_SOCK; SSH_AGENT_PID=7124; export SSH_AGENT_PID; echo Agent pid 7124; This starts the ssh-agent daemon and forks it into the background. You will note it sends an output of some commands to stdout. These are environment variables that need to be set in order for you to use ssh-agent. The first, SSH_AUTH_SOCK, indicates the location of the local socket ssh-agent uses. The second is SSH_AGENT_PID, which indicates the process ID of ssh-agent that is being started. The process of the commands being written out to stdout does not mean the environment variables are being set. You need to cut and paste the commands into the shell, or you can run the ssh-agent encapsulated in the eval function, which will set all of the environment variables. Enter the following: puppy$ eval `ssh-agent` Agent pid 7183 puppy$ env | grep 'SSH' SSH_AGENT_PID=7183 SSH_AUTH_SOCK=/tmp/ssh-SKxNXX7249/agent.7183 The ssh-agent binary also has a few additional command-line options (see Table 3-12). Table 3-12. ssh-agent Command-Line Options
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Generates C-shell commands on stdout. Generates Bourne shell commands on stdout. Kills the current agent (which needs the SSH_AGENT_PID environment variable set). Sets a default value for the maximum lifetime of keys added to the agent in seconds. Defaults to forever. Debug mode.
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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
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