Configure OpenSSH to allow Public-key authentication
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Create file touch ~/.ssh/authorized_keys and add public key of client to provide access.
Limit connecting host and command: It is also possible also to lock access to only be able to run a specific command, or use it only from a specific host [1]. See man ssh.
Example syntax::cat ~/.ssh/authorized_keys
from="10.22.33.45",command="/path/to/executable argument" ssh-rsa key name
See also
sudo,visudo,su, passwd, sudo su,Passwordless sudo,/etc/sudoers,/etc/sudoers.d/,/etc/sudoers,sudo --help- Cisco IOS/Configure public RSA key authentication
/etc/ssh/sshd_config:AuthenticationMethods, PasswordAuthentication,PermitRootLogin,MaxStartups, sshd_config
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Original Source: https://en.wikiversity.org/wiki/OpenSSH/Configure_OpenSSH_to_allow_Public-key_authentication
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