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Con guring SSH
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The Secure Shell (ssh) service on your Linux system works in almost the same manner as Telnet Like Telnet, it allows you to access the shell prompt on your Linux system from a remote computer system Also like Telnet, ssh is a client-server system You run the sshd daemon on the Linux system you want to connect to You run an ssh client on the remote client system However, unlike Telnet, ssh uses encryption to scramble that data being transmitted between the ssh client and the sshd daemon This scrambling is accomplished using encryption keys An eavesdropper can still capture data begin transferred between the client and the server, but because they don t have the encryption key, it s just gibberish to them To use ssh, you must first install the openssh package on your system from your distribution media, shown in Figure 14-60
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FIGURE 14-60
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Installing the openssh package
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14: Con guring Linux Network Services
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FIGURE 14-61
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This package includes both the sshd daemon and the ssh client After installation, you can configure the sshd daemon using the /etc/ssh/sshd_config file, shown in Figure 14-61 There are many directives within this file The good news is that after installing the openssh package the default parameters work very well in most circumstances To get sshd up and running, you shouldn t have to make any changes to the sshd_config file The ssh client on a Linux system is configured using the /etc/ssh/ssh_config file, shown in Figure 14-62 The /etc/ssh/ssh_config file is used to specify default parameters for all users running ssh on the system A user can override these defaults using the ~/ssh/ssh_ config file in his or her home directory As with the sshd daemon, the default parameters used in this file usually work without any customization Of course, before you can connect to the sshd daemon
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Con gure Remote Access on Linux
on your Linux system, you must open up IP port 22 in your host-based firewall After doing so, you can load the ssh client on the remote computer and connect to the sshd daemon on your Linux system by entering ssh l user_name ip_address For example, if I wanted to connect to my remote Linux system (which has an IP address of 192168110) as the user tux using the ssh client on a local computer system, I would enter ssh l tux 192168110 at the shell prompt This is shown in Figure 14-63 As with Telnet, ssh allows you full access to the shell prompt You can manage your Linux system as if you were sitting in front of it To close the connection, just enter exit at the shell prompt Because the ssh client uses an encryption key to encrypt and decrypt transmissions, you may be prompted to accept the key the first time you connect to a given sshd daemon If you see this prompt, enter yes to accept the key Windows workstations don t provide an ssh client You can download the PuTTY ssh client from the Internet to connect to a Linux sshd daemon from a Windows workstation Next, let s review some other command-line utilities you can use to remotely manage a Linux system
Using Remote Command-Line Utilities
In addition to Telnet and ssh, you also need to know how to use several other remote management utilities for your Linux+ exam These include the following:
rsh rlogin rcp
These utilities are frequently referred to as the r utilities Frankly, the r utilities aren t used much any more Nearly everything they can do can be done more securely using ssh Like Telnet, the r utilities don t use encryption; an eavesdropper sniffing the network can capture all data transmissions, including usernames and passwords
FIGURE 14-63
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