This key bans logging in to the ssh system without using a password, effectively requiring all users to set passwords. We will use nano in this demo, but vi or emacs can be used instead.Ĭiphers aes128-ctr,aes192-ctr,aes256-ctr Disallow empty password To edit the ssh_config file, open a Terminal window and edit the file with your preferred text editor. We will cover the most relevant collection of changes below.
A detailed explanation of each key’s functionality can be found on the ssh_config man page. Options are declared using a key/definition pair. Wildcards like * can be used to match multiple hostnames with a single declaration. Each host contains specific settings for that host. The ssh configuration file is organized by hosts. The ssh_config file is used to control how secure shell, better known as the ssh terminal command, operates on your system. What is the ssh_config file and what does ssh_config do? You can edit whichever one is better suited to your purposes. Going forward, we will refer to this configuration file as “ssh_config” for clarity and simplicity. This file sets user-specific options without changing the system’s configuration. On macOS systems, the configuration file is found at “/private/etc/ssh/ssh_config,” which is symlinked to “/etc/ssh/ssh_config” for compatibility.Ī second, user-specific ssh_config is found at “~/.ssh/ssh_config.” If it exists, this file supersedes the system-wide configuration file. It can be used for simple alternations, like changing the ssh port on your devices, can often eliminate a huge number of ssh “cold calls” on your machine, the ssh configuration file can do much more than that.
The SSH configuration file on your Mac controls how secure shell, aka SSH, operates.
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