Configure SSH Key-Based Authentication on Linux

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i12bretro

Subscribers:

14,500

Published on June 5, 2023 9:00:13 AM ● Video Link: https://www.youtube.com/watch?v=GW6_xA_WxsM

Duration: 2:04

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#SSH #Linux #KeyBasedAuthentication #Certificates

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

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Connecting from a Linux Host
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   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
 
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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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