Configure SSH Key-Based Authentication on Linux

#SSH #Linux #KeyBasedAuthentication #Certificates

Full steps can be found at https://i12bretro.github.io/tutorials/0554.html

Connecting from a Linux Host

   01. Log into the source Linux host    02. Run the following command in a terminal window          # generate a new ssh key pair          ssh-keygen -t rsa    03. Press enter to accept the default location    04. Optionally, set a password for the key pair NOTE: If you don't provide a password, anyone with the key and access to the target host can connect using the key. Proceed with caution    05. Continue with the following command          # output the public key          cat ~/.ssh/id_rsa.pub    06. Copy the output ssh-rsa public key to the clipboard    07. Log into the target Linux machine    08. Run the following command in a terminal window          # create .ssh directory          mkdir ~/.ssh -p          # edit the authorized_keys file          nano ~/.ssh/authorized_keys    09. Paste the copied public key to the bottom of the file    10. Press CTRL+O, Enter, CTRL+X to write the changes    11. Back on the source Linux device, connect to the Linux target using ssh (ie ssh username@hostname)    12. Type yes and press Enter the first time connecting with a new public key to accept the connection

Connecting from a Windows Host

   01. Log into the Windows host    02. Right click the Start menu ≫ Run ≫ Type cmd ≫ Press Enter    03. Run the following command in the command prompt          # generate a new ssh key pair          ssh-keygen -t rsa    04. Press enter to accept the default location    05. Optionally, set a password for the key pair NOTE: If you don't provide a password, anyone with the public key and access to the target host can connect using the key    06. Continue with the following command          # output the public key          type %userprofile%.ssh\id_rsa.pub    07. Copy the output ssh-rsa public key to the clipboard    08. Log into the target Linux machine    09. Run the following command in a terminal window          # create .ssh directory          mkdir ~/.ssh -p          # edit the authorized_keys file          nano ~/.ssh/authorized_keys    10. Paste the copied public key to the bottom of the file    11. Press CTRL+O, Enter, CTRL+X to write the changes    12. Back on the Windows device, connect to the Linux target using ssh (ie ssh username@hostname)    13. Type yes and press Enter the first time connecting with a new public key to accept the connection  

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