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You create your public and private keys using the ssh-keygen command You need to specify the kind of encryption you want to use You can use either DSA or RSA encryption Specify the type using the -t option and the encryption name in lowercase (dsa or rsa) In the following example, the user creates a key with the RSA encryption:
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ssh-keygen -t rsa
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The ssh-keygen command prompts you for a passphrase, which it will use as a kind of password to protect your private key The passphrase should be several words long You are also prompted to enter a filename for the keys If you do not enter one, SSH will use its defaults The public key will be given the extension pub The ssh-keygen command generates the public key and places it in your ssh/id_dsapub or ssh/id_rsapub file,
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FIGURE 19-1 SSH setup and access
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depending on the type of key you specified; it places the private key in the corresponding ssh/id_dsa or ssh/id_rsapub This is file
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NOTE The ssh/identity filename is used in SSH version 1; it may be installed by default on older
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distribution versions SSH version 2 uses a different filename, ssh/id_dsa or ssh/id_rsa, depending on whether RSA or DSA authentication is used If you need to change your passphrase, you can do so with the ssh-keygen command and the -p option Each user will have their own SSH configuration directory, called ssh, located in their own home directory The public and private keys, as well as SSH configuration files, are placed here If you build from the source code, the make install operation will automatically run ssh-keygen Table 19-3 lists the SSH configuration files
File $HOME/ssh/known_hosts $HOME/ssh/random_seed $HOME/ssh/id_rsa $HOME/ssh/ id_dsa $HOME/ssh/id_rsapub
Description Records host keys for all hosts the user has logged in to (that are not in /etc/ssh/ssh_known_hosts) Seeds the random number generator Contains the RSA authentication identity of the user Contains the DSA authentication identity of the user Contains the RSA public key for authentication The contents of this file should be added to $HOME/ssh/ authorized_keys on all machines where you want to log in using RSA authentication Contains the DSA public key for authentication The contents of this file should be added to $HOME/ssh/ authorized_keys on all machines where you want to log in using DSA authentication The per-user configuration file Lists the RSA or DSA keys that can be used for logging in as this user Contains the systemwide list of known host keys Contains the systemwide configuration file This file provides defaults for those values not specified in the user s configuration file Contains the SSH server configuration file Contains the system default Commands in this file are executed by ssh when the user logs in, just before the user s shell (or command) is started Contains commands executed by ssh when the user logs in, just before the user s shell (or command) is started
$HOME/ssh/id_dsapub
$HOME/ssh/config $HOME/ssh/authorized_keys /etc/ssh/ssh_known_hosts /etc/ssh/ssh_config
/etc/ssh/sshd_config /etc/ssh/sshrc
$HOME/ssh/rc
TABLE 19-3 SSH Configuration Files
19:
Secure Shell and Kerberos
Authorized Keys
A public key is used to authenticate a user and its host You use the public key on a remote system to allow that user access The public key is placed in the remote user account s ssh/ authorized_keys file Recall that the public key for DSA is held in the ssh/id_dsapub file If a user wants to log in remotely from a local account to an account on a remote system, they would first place their public key for DSA in the ssh/authorized_keys file in the account on the remote system they want to access If the user larisa on turtlemytrekcom wants to access the aleina account on rabbitmytrekcom, larisa s public key from /home/ larisa/ssh/id_dsapub first must be placed in aleina s authorized_keys file, /home/aleina/ ssh/authorized_keys User larisa can send the key or have it copied over A simple cat operation can append a key to the authorized key file In the next example, the user adds the public key for aleina in the larisapub file to the authorized key file The larisapub file is a copy of the /home/larisa/ssh/id_dsapub file that the user received earlier
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