SSH

SSH Key Setup

Key Authentication with PuTTY

Server-side

• Begin with generating proper folder permissions for .ssh
• Make sure you're under the proper user before entering code

ssh-keygen

Accept defaults for all prompts: [enter]

Now create an authorized keys file under the .ssh folder created, and set permissions

touch /home/<username>/.ssh/authorized_keys
chmod 600 /home/<username>/.ssh/authorized_keys

PuttyGen

Inside of the puttygen program generate a key that will be used for connecting to the server

1. Under Actions heading click on Generate to generate a key pair
2. When done, click on Save Private Key, and name it priv.ppk
3. Manually copy and paste the public key starting from "ssh-rsa" down to the end of the key ending in "rsa-key-<numbers>" into a new file named public
4. Once you're done with this make sure to move a copy of the files into a new entry for KeePass

Server-side

Copy the text of the public key you created, and insert it into the authorized_keys file:

vim /home/<username>/.ssh/authorized_keys

Apply the key to a separate ssh session to make sure you've done everything correctly

Now to disallow root login and change other configuration for ssh:

sudo -i

(you are now under the root user)

vim /etc/ssh/sshd_config

Within the config change settings to match the following  !!Remove # sign if applicable!!

 PermitRootLogin no
 PasswordAuthentication no
 UsePAM no

Finally, Restart the sshd service to enable these changes:

sudo systemctl restart sshd