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The security of SSH relies on the use of public/private key pairs. By default, the client tries to authenticate using RSA or DSA key pairs. To make this work, the server must have the client s public key, which is something that you have to configure by hand, as you ll see later. When the client has a public/private key pair, it generates an encrypted string with its private key. If the server can decrypt this string using the client s public key, the client s identity is authenticated. When using public/private key pairs, you can configure different things. First, the user needs to determine what cryptographic algorithm she wants to use. For this purpose, she can choose between RSA and DSA (DSA is considered stronger). Next, she has to decide if she wants to protect her private key with a passphrase. Using a passphrase is important because the private key really is used as the identity of the user. Should anyone steal this private key, it would be possible to forge the identity of the key s owner, so it s a very good idea to secure private keys with a passphrase.
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CHAPTER 8 MAKING A CONNECTION
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Basically, Secure Shell is a suite of tools that consists of three main programs and a daemon: sshd. Before being able to use it, of course, you have to install it using apt-get install openssh-server (you might have installed it already using the SSH installation pattern when you installed your server). The tools are ssh, scp, and sftp. The first, ssh, is used to establish a secured remote session. Let s say that it s like telnet but cryptographically secured. The second, scp, is a very useful command that s used to copy files to and from another server where the SSH process is running. The third, sftp, is a secure FTP client interface. Using it establishes a secured FTP session to a server that s running the sshd. Two of the best things of all these tools are that they can be used without any preparation or setup, and you can set them up to work entirely according to your needs. They are at once easy-to-use and very specialized tools.
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The simplest way to work with SSH is to just enter the ssh command, followed by the name of the host you want to connect to. For example, to connect to the host AMS.sandervanvugt.com, use ssh AMS.sandervanvugt.com. Depending on whether you ve connected to that host before, it may check the host credentials or just ask for your password. The ssh command doesn t ask for a user name because it assumes that you want to connect to the other host with the same identity that you re logged in with locally. If you d rather log in with another user account, you can indicate this intention in one of two ways. You can specify the user name and follow it with an at sign (@) when establishing the connection to the remote host, and you can also use the -l option followed by the name of the user account you want to use to connect to the other host. So ssh linda@AMS.sandervanvugt.com and ssh -l linda AMS.sandervanvugt.com accomplish the same thing. After establishing a session, use the exit command (or Ctrl+D) to close the session and return to your own machine. Now, it seems a lot of trouble to log in to a remote host if you just need to enter one or two commands. If you face this situation often, it s good to know that you can just specify the name of the command at the end of the ssh command: ssh -l linda@AMS.sandervanvugt.com ls -l provides a long listing of files that user linda has in her home directory at the other host. Of course, this isn t the most realistic example of how to use one command only sessions to a host, but you probably can see its value when working from shell scripts.
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