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Using scp to Copy Files Securely
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The scp command is another part of the SSH suite that you ll definitely like. It s used to copy files securely. If you know how the cp command works, you ll know how to handle scp. The only difference is that it requires a complete network pathname, including the names of the host and the file you want to copy. Also, if you don t want to use the name of the user you are currently logged in as, a user name should be included as well. Consider the following example: scp /some/file linda@AMS.sandervanvugt.com:/some/file This easy command copies /some/file to AMS.sandervanvugt.com and places it in the directory /some/file on that host. Of course, it s possible to do the opposite as well: scp
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CHAPTER 8 MAKING A CONNECTION
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root@SFO.sandervanvugt.com:/some/file /some/file copies /some/file from a remote host with the name SFO.sandervanvugt.com to the localhost. You ll like the -r option as well because it allows you to copy a complete subdirectory structure.
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Using sftp for Secured FTP Sessions
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As an alternative to copying files with scp, you can use the sftp command. This command is used to connect to servers running the sshd program and to establish a secured FTP session with it. From the sftp command, you have an interface that really looks a lot like the normal FTP client interface. All the standard FTP commands work here as well, except that it s secure in this case. For example, you can use the ls and cd commands to browse to a directory and see what files are available and use the get command from there to copy a file to the current local directory.
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Configuring SSH
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In an SSH environment, a node can be client and server simultaneously. So, as you can imagine, there s a configuration file for both of these aspects. The client is configured in /etc/ssh/ ssh_config, and the server uses /etc/ssh/sshd_config. Setting options for the server isn t hard to understand: just put them in the configuration file for the /etc/ssh/sshd_config daemon. For the client settings, however, the situation is more complicated because there are several ways of overwriting the default client settings: The generic /etc/ssh/ssh_config file is applied to all users initiating an SSH session. An individual user can overwrite them if he creates a .ssh_config file in the .ssh directory of his home directory. An option in /etc/ssh/ssh_config has to be supported by the sshd_config file on the server you are connecting to. For example, if you re allowing password-based authentication from the client side, but the server doesn t allow it, it won t work. Options in both files can be overwritten with command-line options. Table 8-3 is an overview of some of the most useful options that you can use to configure the client in ssh_config. Table 8-3. Useful options in ssh_config
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Description
This option restricts the following declarations (up to the next Host keyword) to a specific host. Therefore, this option is applied on a host that a user is connecting to. The host name is taken as specified on the command line. Use this parameter to add some extra security to specific hosts. You can also use wildcards such as * and to refer to more than one host name. If this option is set to yes (the default value), SSH will check the host IP address in the known_hosts file. Use this as a protection against DNS or IP address spoofing.
Continued
CheckHostIP
CHAPTER 8 MAKING A CONNECTION
Table 8-3. Continued
Option
Ciphers
Description
This option, which takes multiple arguments, is used to specify the order in which the different encryption algorithms should be tried to use in an SSHv2 session (version 2 is the default SSH version nowadays). The yes/no values for this option specify whether to use compression. The default is no. This very useful option specifies if X11 connections will be forwarded. If set to yes, graphical screens from an SSH session can be forwarded through a secure tunnel. The result is that the DISPLAY environment variable that determines where to draw graphical screens is set correctly. If you don t want to enable X forwarding by default, use the -X option on the command line when establishing an SSH session. This option specifies that a TCP/IP port on the local machine is forwarded over SSH to the specified port on a remote machine. (See Generic TCP Port Forwarding later in this chapter for more details.) Use this option to specify the level of verbosity for log messages. The default value is INFO. If this doesn t go deep enough, VERBOSE, DEBUG, DEBUG1, DEBUG2, and DEBUG3 provide progressively more information. Use this option to specify whether or not you want to use password authentication. By default, password authentication is used. In a secure environment in which keys are used for authentication, you can safely set this option to no to disable password authentication completely. This option specifies the protocol version that SSH should use. The default value is set to 2,1 (which indicates that version 2 should be used first and, if that doesn t work, version 1 is tried). It s a good idea to disable version 1 completely because it has some known security issues. Use this option to specify whether you want to use public key based authentication. This option should always be set to the default value (yes) because public key based authentication is the safest way of authenticating.
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