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CHAPTER 3 s SECURING CONNECTIONS AND REMOTE ADMINISTRATION
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Table 3-10. Additional ssh-keygen Command-Line Options
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-b bits -f keyfile -e -i -l -t type -y
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Number of bits in the key that defaults to 1024. Specifies a particular key file. Exports a specified keyfile (using the -f option) in SECSH format to stdout. Imports a SECSH or SSH2 key file and outputs an OpenSSH-compatible file to stdout. Shows the fingerprint of a specified keyfile. Specifies the type of key generated, which can include rsa1, rsa, and dsa. Reads in a specified private key file and outputs an OpenSSH public-key file to stdout.
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The -b option allows you specify the number of bits. It defaults to 1024, and I recommend not using a size smaller than that. The -f option is designed to be used in conjunction with other options such as -y, -e, or -i to specify a particular key file. The -e and -i options allow the export and import of keys into OpenSSH, respectively. The imported keys need to be in SSH2 or SECSH format.18 The -l option displays the fingerprint of a particular key specified by the -f option. You can use the -t option to specify what type of encryption to use to create the key. By default ssh-keygen uses RSA encryption, but you can specify DSA encryption using the option dsa. I recommend you use RSA. Using the last option, -y, you can input an OpenSSH private key and output the equivalent public key. You can use other options, which you can find in the ssh-keygen man page.
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s Note In the last paragraph I recommend using RSA encryption over DSA encryption. This is a somewhat subjective judgment; considerably debate takes place in cryptography circles about which is more secure.19 That debate falls out of the scope of this book, but at this point until more information is available I recommend going with the better-documented and better-researched cipher system, RSA. But as previously mentioned, you should be using SSH version 2 only.
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So, you have keys on your local system, either created when you installed OpenSSH or created using the ssh-keygen tool. Next you need to add your public key to the remote systems lists of suitable keys. OpenSSH maintains a register of the public keys it will accept connections from in two places. The first is on a per-user basis in the file homedirectory/.ssh/ authorized_keys. The second is a centralized register in the file /etc/ssh/authorized_keys. In either of these files, each key should be on a single line in the file. When a user logs into the server, the remote ssh command tells the local sshd server what key pair it will use; this key is checked against the central authorized_keys file and then the user s authorized_keys file to see if the key is permitted. It then sends the user a challenge, encrypted with the specified
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18. http://www.openssh.org/txt/draft-ietf-secsh-publickeyfile-02.txt 19. If you are interested in the debate, see http://www.rsasecurity.com/rsalabs/node.asp id=2240.
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CHAPTER 3 s SECURING CONNECTIONS AND REMOTE ADMINISTRATION
public key, which can be decrypted only by the proper private key. If the ssh command is able to decrypt it, then the decrypted challenge is sent back to the remote sshd server and the connection is authenticated. This happens all without the private key being disclosed across the network or to the remote server. Once you have authenticated to a remote system, you have both the option of signing onto a shell session on the remote system, but you can also replicate the functionality of the rsh, or remote shell command shell, which allows you to remotely execute commands on another system. Listing 3-33 shows a remote command execution using ssh. Listing 3-33. Remote Command Execution Using ssh puppy$ ssh bob@kittten.yourdomain.com "ls -l /etc/ssh" bob@kitten's password: total 124 -rw------1 root root 88039 Sep 18 2003 moduli -rw-r--r-1 root root 1163 Jun 6 02:56 ssh_config
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