SSH Key-Pair Authentication2016/04/23
Configure SSH server to login with Keys Authentication. Create a private key for client and a public key for server to do it.
|||Create key pair for each user, so login with a common user and work it like follows.|
# create key pair
ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/home/ubuntu/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
# set passphrase (if not set, Enter with empty)
Enter same passphrase again:
Your identification has been saved in /home/ubuntu/.ssh/id_rsa. Your public key has been saved in /home/ubuntu/.ssh/id_rsa.pub. The key fingerprint is: 30:ee:f0:47:38:9d:8a:24:5e:01:c8:13:df:15:40:b4 ubuntu@dlp The key's randomart image is:ubuntu@dlp:~$
mv ~/.ssh/id_rsa.pub ~/.ssh/authorized_keys
chmod 600 ~/.ssh/authorized_keys
|||Transfer the secret key created on the Server to a Client, then it's possbile to login with keys authentication.|
# copy the secret key to the local ssh directory
scp email@example.com:/home/ubuntu/.ssh/id_rsa ~/.ssh/
Enter passphrase for key '/home/ubuntu/.ssh/id_rsa':
Last login: Wed April 24 21:37:19 2016 from www.srv.world
# just logined
|||If you set "PasswordAuthentication no", it's more secure.|
# line 52: uncomment and turn to "no"
systemctl restart ssh
SSH Key-Pair Authentication from Windows Client
It's the example to login to SSH server from Windows Client. It uses Putty on here. Transfer a secret key to Windows Client first.
|||Download "Puttygen.exe" from Putty Site and save it under the Putty directory. Next execute it and click "Load" button.|
|||Specify the secret key which you downloaded, then passphrase is required like follows, answer it.|
|||Click "Save private key" button to save it under a folder you like with any file name you like.|
|||Start Putty and open [Connection]-[SSH]-[Auth] on the left menu, then select the "private_key" which was just saved above.|
|||Back to the [Session] on the left menu and connect to the SSH server.|
|||The passphrase is required to login, then answer it. If it's correct, it's possible to login normally like follows.|