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Do not forget to specify the full path of the key for the HostKey to locate the new private key file. Making a new set of keys on a fixed interval will increase your SSH server s security and is important if the current private key is stolen.
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Earlier, when you connected to your local SSH server, you were asked if you want to accept or reject the local SSH server host because of an unknown fingerprint. The result is similar to Listing 11-1. Listing 11-1. The SSH client asking for your connection opinion [root@localhost ~]# ssh root@localhost The authenticity of host 'localhost (127.0.0.1)' can't be established. RSA key fingerprint is b4:d5:3e:81:02:b2:80:8c:dc:c1:c0:c5:0d:eb:f8:6e. Are you sure you want to continue connecting (yes/no) The value b4:d5:3e:81:02:b2:80:8c:dc:c1:c0:c5:0d:eb:f8:6e is your SSH server s fingerprint, which is used by your SSH client to check the authenticity of the server. This happens if you connect to an SSH server for the first time. The fingerprint is derived from the remote server s public key. Included with the fingerprint are the host s name or IP address, the type of encryption algorithm used by its public key (RSA), and the question for the user if he wants to accept it. If you accept the fingerprint by typing yes, the public key of the local SSH server is saved in the known_hosts file inside the .ssh directory of your home directory. The next time you connect to your local SSH server and you have its public key, you will not be asked again for fingerprint verification. Your SSH client will be able to derive the fingerprint value of your local SSH server s public key in the known_hosts file and compare it with the one being sent by the server during the connection attempt by the user for a match. The same process will apply if you are going to connect to another SSH server.
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In the following example, you play the role of the client trying to connect to the SSH server on 192.168.1.104. The server s administrator gave you a copy of his SSH server s public key contained in the ssh_host_rsa_key.pub file and you want to know if the fingerprint value derived from that file matches the one being shown on your prompt. To check whether the fingerprint value matches, you are going to use the ssh-keygen command. The syntax is ssh-keygen l f given_public_key_file where l informs ssh-keygen to get the fingerprint value of the given_public_key_file being pointed to by the f flag. After a successful run, you will see the output formatted like this: size fingerprint_value public_key_file encryption_method where size is the actual size of the public key, fingerprint_value is the fingerprint value of the key, public_key_file is the file that was used, and encryption_method is the method used to encrypt the key. This is the sample output of my run on ssh-keygen. The important part is the highlighted section: 2048 b4:d5:3e:81:02:b2:80:8c:dc:c1:c0:c5:0d:eb:f8:6e ssh_host_rsa_key.pub (RSA) Use the value you get in the second part of the output to match with the fingerprint shown by your ssh client. If it matches, it is safe to connect; otherwise, don t.
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After making a successful connection to an SSH server, the SSH client will store the remote host s public key inside the known_hosts file in the user s .ssh directory. This file will serve as a reference to the public keys it has collected from the SSH servers you have connected to. The SSH client will be able to derive the fingerprint values from this file when connecting to a server for verification. In case the public key and fingerprint value of a server has changed, the SSH client will issue a warning to the user and prevent the connection. The warning includes the offending line number, and you have to keep a note of it. This is for security purposes, and the first thing to do is to ask the server administrator if the SSH keys actually changed. If they did, you have to ask for the new public key and keep it for validation. Next, with the offending line number recorded from the warning earlier, open up the known_hosts file and find the line, then remove it. Reconnect to the server with the new public key and have the fingerprint validated as before.
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