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Recipe 6.1 Logging into a Remote Host
6.1.1 Problem
You want to log into a remote host
securely.
6.1.2 Solution
$ ssh -l remoteuser remotehost
For example:
$ ssh -l smith server.example.com
If your local and remote usernames are the same, omit the
-l option:
$ ssh server.example.com
6.1.3 Discussion
The client program ssh establishes a secure
network connection to a remote machine that's
running an SSH server. It authenticates you to the remote machine
without transmitting a plaintext password over the network. Data that
flows across the connection is encrypted and decrypted transparently.By default, your login
password serves as proof of your identity
to the remote machine. SSH supports other authentication methods as
we'll see in other recipes. [Recipe 6.4][Recipe 6.8]Avoid the insecure programs rsh,
rlogin, and telnet when
communicating with remote hosts.[1] They do not encrypt your
connection, and they transmit your login password across the network
in the clear. Even if the local and remote hosts are together behind
a firewall, don't trust these programs for
communication: do you really want your passwords flying around
unencrypted even on your intranet? What if the firewall gets hacked?
What if a disgruntled coworker behind the firewall installs a packet
sniffer? [Recipe 9.19] Stick with SSH.
[1] And avoid
ftp in favor of scp or
sftp for the same reasons. [Recipe 6.3]
6.1.4 See Also
ssh(1). We keep lots of SSH tips at http://www.snailbook.com. The official
OpenSSH site is http://www.openssh.com.
