Then to use SSH immediately without having to reboot use: # systemctl start ssh.service To instead permanently enable the SSH service to start whenever the system is booted use: # systemctl enable ssh.service When finished: # systemctl stop ssh.socket If you only need to temporarily start up the SSH service it’s recommended to use ssh.socket: # systemctl start ssh.socket At a basic level a service unit controls a process and a socket unit controls a filesystem or network socket. The units relevant to SSH are ssh.service and ssh.socket. It’s useful to know that Systemd has different units, a unit configuration file encodes information. You could also allow the root user login here, but instead consider creating a non-privileged user account instead. Then disabling password authentication: PasswordAuthentication no If you think you will use it for a length of time I would recommend at minimum enabling public key authentication: PubkeyAuthentication yes If you are only planning on using SSH briefly the defaults are probably fine. The next step is to edit the SSH server configuration file with the settings you need: # nano /etc/ssh/sshd_config Then to regenerate the keys: # dpkg-reconfigure openssh-server # mv /etc/ssh/ssh_host_* /etc/ssh/default_keys/ To backup the original keys first as a precaution use: # mkdir /etc/ssh/default_keys Since Kali comes with pre-generated SSH keys, to make it more secure, the first thing we will do is generate new ones. I will cover some of the basics briefly, but this is not meant to be a guide on securely running an SSH server. When enabling the service, be sure to fully secure SSH first. If it’s not installed, you can use this command to install it: # apt install openssh-server You should see the version with after it like this: The openssh-server package should already be installed, to verify this you can use the following command: # apt list openssh-server
This post will go over the Systemd method for enabling and starting the SSH (Secure Shell) service on Kali Linux.
This change brought with it a new way of enabling and starting services, even though many still use the old commands, which often still work but may also lead to errors. For quite some time now (Since version 2.0) Kali has used Systemd (System Management Daemon) in place of an init system. The Linux distribution Kali used by many penetration testers (including those here at LMG Security) recently released version 2017.1 of their rolling release. Thanks for visiting our blog and we hope you find this post helpful! We’re also passionate about increasing cybersecurity awareness through our various training programs. Here at LMG Security, we’re passionate about providing excellent cybersecurity services to organizations around the world.
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