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A full set of OpenSSH RPM packages are included with Red Hat distributions. These include the general OpenSSH package (openssh), the OpenSSH server (openssh-server), and the OpenSSH clients (openssh-clients). These packages also require OpenSSL (openssl) with installs the cryptographic libraries that SSH uses. You can easily update them from Red Hat FTP sites or by using the Red Hat Network. The SSH applications are listed in Table 40-9. They include several client programs and the ssh server. The ssh server (sshd) provides secure connections to anyone from the outside using the ssh client to connect. With ssh, users can remotely log in and execute commands using encrypted transmissions. In the same way, with scp, users can copy files from one host to another securely. The ssh server can also invoke the sftp-server to provide encrypted FTP transmissions to those using the sftp client. This client, which only works with ssh version
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2.0, operates much like ftp, with many of the same commands (see 19). Several configuration utilities are also included, such as ssh-add, which adds valid hosts to the authentication agent, and ssh-keygen, which generates the keys used for encryption. On Red Hat you can start, restart, and stop the sshd server with the service command:
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Application ssh sshd sftp sftp-server scp ssh-keygen ssh-add ssh-agent ssh-askpass ssh-askpass-gnome ssh-signer slogin
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Table 40-9: SSH Applications Description ssh client ssh server (daemon) sftp client. Version 2 only. Use to list sftp commands sftp server. Version 2 only scp client Utility for generating keys. -h for help Add identities to the authentication agent SSH authentication agent X Window System utility for querying passwords Gnome utility for querying passwords Signs host-based authentication packets. Version 2 only. Must be suid root (performed by installation) Remote login (version 1)
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SSH was originally designed to replace remote access operations, such as rlogin, rcp, and telnet, as well as FTP (see 21). The ssh-clients package contains corresponding SSH clients to replace these applications. With slogin or ssh, you can log in from a remote host to execute commands and run applications, much as you can with rlogin and rsh. With scp, you can copy files between the remote host and a network host, just as with rcp. scftp lets you make secure FTP connections. For version 2.0, names of the actual applications have a 2 suffix to indicate they are version 2.0 programs. Version 1.0 applications have a 1 as their suffix. During installation, however, links are set for each application to use only the name with the suffix. For example, if you have installed version 2.0, there is a link called scp to the scp2 application. You can then use the link to invoked the application. Using scp starts scp2. Table 40-9 specifies only the link names, as these are the same for each version. Remember, though, some applications, such as sftp, are only available with version 2.0.
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Using SSH involves creating your own public and private keys and then distributing your public key to other users you want to access. These can be different users or simply user accounts of your own that you have on remote systems. Often people remotely log in from a local client into an account on a remote server, say from a home computer to a company computer. Your home computer would be your client account and the account on your company computer would be your server account. On your client account, you would need to
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generate your public and private keys. Then you would have to place a copy of your public key in the server account. You can do this by simply emailing the key file or copying the file from a floppy disk. Once the account on your server has a copy of your client user's public key, you can access the server account from your client account. You will be also prompted for the server account's passphrase. You will have to know this to access that account. Figure 40-3 illustrates the SSH setup that allows a user george to access the account cecelia.
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Figure 40-3: SSH setup and access The following steps are needed to allow you to use SSH to access other accounts. 1. Create public and private keys on your account along with a passphrase. You will need to use this passphrase to access your account from another account. 2. Distribute your public key to other accounts you want to access, placing them in the .ssh/authorized_keys or .ssh/authorized_keys2 file. 3. Other accounts also have to set up a public and private key along with a passphrase. 4. You will need to also know the other account's passphrase to access it. You create your public and private keys using the ssh-keygen command. 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. For SSH version 1, the ssh-keygen command generates the public key and places it in your .ssh/identity. pub file; it places the private key in the .ssh/identity file. For SSH version 2, the ssh- keygen command generates the public key and places it in your .ssh/id_dsa.pub file; it places the private key in the .ssh/id_dsa file. If you need to change your passphrase, you can do so with the ssh-keygen command and the p option. Each user will have his or her 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, then the make install operation will automatically run ssh-keygen. Table 40-10 lists the SSH configuration files. Table 40-10: SSH Configuration Files (SSH2 files are placed in /etc/ssh2 and .ssh2 directories) File Description $HOME/.ssh/known_hosts $HOME/.ssh/random_seed $HOME/.ssh/identity Records host keys for all hosts the user has logged in to (that are not in /etc/ssh/ssh_known_hosts). Used for seeding the random number generator. Contains the RSA authentication identity of the user.
Table 40-10: SSH Configuration Files (SSH2 files are placed in /etc/ssh2 and .ssh2 directories) File Description $HOME/.ssh/identity.pub Contains the public key for authentication (public part of the identity file in human- readable form). 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. The per-user configuration file. Lists the RSA keys that can be used for logging in as this user. Systemwide list of known host keys. Systemwide configuration file. This file provides defaults for those values not specified in the user's configuration file. SSH server configuration file. This file is used in .rhosts authentication to list the host/user pairs permitted to log in. Note, this file is also used by rlogin and rsh, which makes using this file insecure. This file is used exactly the same way as .rhosts. The purpose for having this file is to use rhosts authentication with ssh without permitting login with rlogin or rsh. This file is used during .rhosts authentication. It contains canonical hosts' names, one per line. If the client host is found in this file, login is automatically permitted, provided client and server usernames are the same. This file is processed exactly as /etc/hosts.equiv. This file may be useful to permit logins using ssh but not using rsh/rlogin. 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. Commands in this file are executed by ssh when the user logs in just before the user's shell (or command) is started.
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