SSH Key-Pair Authentication
2014/04/18 |
Configure SSH server to login with Keys Authentication.
Create a private key for client and a public key for server to do it.
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[1] | Create key pair for each user, so login with a common user and work it like follows. |
# create key pair trusty@dlp:~$ ssh-keygen -t rsa Generating public/private rsa key pair. Enter file in which to save the key (/home/trusty/.ssh/id_rsa): # Enter 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/trusty/.ssh/id_rsa. Your public key has been saved in /home/trusty/.ssh/id_rsa.pub. The key fingerprint is: 30:ee:f0:47:38:9d:8a:24:5e:01:c8:13:df:15:40:b4 trusty@dlp The key's randomart image is:trusty@dlp:~$ mv ~/.ssh/id_rsa.pub ~/.ssh/authorized_keys trusty@dlp:~$ chmod 600 ~/.ssh/authorized_keys |
[2] | 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 ubuntu@www:~$ scp trusty@10.0.0.30:/home/trusty/.ssh/id_rsa ~/.ssh/ trusty@10.0.0.30's password: id_rsa ssh trusty@10.0.0.30 Enter passphrase for key '/home/trusty/.ssh/id_rsa': # passphrase Last login: Wed April 24 21:37:19 2014 from www.srv.world trusty@dlp:~$ # just logined |
[3] | If you set "PasswordAuthentication no", it's more secure. |
root@dlp:~#
vi /etc/ssh/sshd_config # line 52: turn to "no" PasswordAuthentication no
initctl restart ssh |
SSH Key-Pair Authentication from Windows Client
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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.
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[4] | Download "Puttygen.exe" from Putty Site and save it under the Putty directory. Next execute it and click "Load" button. |
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[5] | Specify the secret key which you downloaded, then passphrase is required like follows, answer it. |
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[6] | Click "Save private key" button to save it under a folder you like with any file name you like. |
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[7] | Start Putty and open [Connection]-[SSH]-[Auth] on the left menu, then select the "private_key" which was just saved above. |
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[8] | Back to the [Session] on the left menu and connect to the SSH server. |
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[9] | The passphrase is required to login, then answer it. If it's correct, it's possible to login normally like follows. |
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