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CHAPTER 8 MAKING A CONNECTION
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2. After creating the public/private key pair, you must transfer the public key to the server. The ultimate goal is to place the contents of the id_dsa.pub file in the /root/ .shh/authorized_keys file on the server. But you can t simply copy the file to the authorized_keys destination file because other keys may already be stored there. Therefore, first use scp to copy the file to a temporary location. The command scp /root/.ssh/id_dsa.pub root@server:/root/from_workstation_key.pub would do the job. 3. Now that the public key is on the server, you have to put it in the authorized_keys file. Before doing this, though, make sure that the .ssh directory exists on the server in the home directory of the user root, and that it has user and group root as its owner and permission mode 700. Then, on the server with /root as your current directory, use cat from_workstation_key.pub >> .ssh/authorized_keys. This command appends the content of the public key file to the authorized_keys file, thus not overwriting any file that may have been there already. 4. Hopefully, no errors have occurred, and you ve been successful. Go back to your workstation and start an SSH session to the server in which you just copied your public key to the authorized_keys file. You ll notice that you are no longer prompted for a password, but for a passphrase instead. This proves that everything worked. Do notice, however, that you need to repeat this procedure for every key-secured server with which you want to be able to establish a session. Working with keys as described in these steps is an excellent way to make SSH authentication more secure. But there s a drawback: if you need to establish an SSH session automatically from a shell script or cron job, it s not very handy if you re first prompted for a key. Therefore, some method is needed to execute such jobs automatically. One solution is to create a special user account with limited permissions and without a passphrase on its private key. Another solution is to run ssh-agent, which caches the keys before they are used (you ll learn how to do this in the next section).
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You can use ssh-agent to save yourself from constantly having to enter private keys. With this program, you can cache keys for a given shell environment. After starting ssh-agent from a shell prompt, you need to add the passphrase for the private key that belongs to it. This is something that you ll do for a specific shell, so after you close that specific shell or load another shell, you ll need to add the passphrase to that shell again. After adding a passphrase to ssh-agent, the passphrase is stored in RAM, and only the user who added the key to RAM can read it from there. Also, ssh-agent listens only to the ssh and scp commands that you ve started locally, so there s no way you can access a key that is kept by ssh-agent over the network. So you can be sure that using ssh-agent is pretty secure. Apart from being secure, it s pretty easy as well. Enabling ssh-agent and adding a passphrase to it is a simple two-step procedure:
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CHAPTER 8 MAKING A CONNECTION
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1. From the shell prompt, use ssh-agent followed by the name of the shell you want to use it from. For example, use ssh-agent /bin/bash to activate ssh-agent for the Bash shell. 2. Now type ssh-add. You ll be prompted for the passphrase of your current private key, and you ll then see the message identity added, followed by the private key whose passphrase is added to ssh-agent.
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Secure Shell is a great way of accessing other hosts. But did you know that you can also use it to Tip mount a file system on a remote computer All modern versions of SSH support this feature: just use sshfs for access to all the files and directories on the remote server, just like a local user on that server. If you know how to mount a directory with the mount command, working with sshfs is easy. For example, the command sshfs linda@AMS:/data /mnt allows access to the /data directory on the remote server and connects that directory to /mnt on the local server. Secure Shell is not installed by default, so use apt-get install sshfs to install it on your server.
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