Once you have installed an OpenSSH server,
sudo apt-get install
openssh-server
you will need to configure it by editing the sshd_config file in
the /etc/sshdirectory.
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sshd_config is the configuration file for the OpenSSH server. ssh_config is the
configuration file for the OpenSSH client. Make sure
not to get them mixed up.
|
First, make a backup of your sshd_config file by copying
it to your home directory, or by making a read-only copy in /etc/ssh by doing:
sudo cp /etc/ssh/sshd_config
/etc/ssh/sshd_config.factory-defaults
sudo chmod a-w
/etc/ssh/sshd_config.factory-defaults
Creating a read-only backup in /etc/ssh means you'll
always be able to find a known-good configuration when you need it.
Once you've backed up your sshd_config file, you can
make changes with any text editor, for example;
sudo gedit
/etc/ssh/sshd_config
runs the standard text editor in Ubuntu 12.04 or more recent.
For older versions replace "sudo" with "gksudo". Once
you've made your changes (see the suggestions in the rest of this page), you
can apply them by saving the file then doing:
sudo restart ssh
If you get the error, "Unable to connect to Upstart",
restart ssh with the following:
sudo systemctl restart ssh
Configuring OpenSSH
means striking a balance between security and ease-of-use. Ubuntu's default
configuration tries to be as secure as possible without making it impossible to
use in common use cases. This page discusses some changes you can make, and how
they affect the balance between security and ease-of-use. When reading each
section, you should decide what balance is right for your specific situation.
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