Ubuntu 21.04
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OpenSSH : Password Authentication
2021/04/28
 
Configure SSH Server to manage a server from the remore computer. SSH uses 22/TCP.
[1] Password Authentication for OpenSSH Server on Ubuntu is enabled by default, so it's possible to login without changing any settings.
Furthermore, root account is prohibited Password Authentication by default with [PermitRootLogin prohibit-password], so default setting is good for use. But if you prohibit root login all, change like follows.
root@dlp:~#
apt -y install openssh-server
root@dlp:~#
vi /etc/ssh/sshd_config
# line 34 : uncomment and change to [no]

PermitRootLogin
no
root@dlp:~#
systemctl restart ssh

SSH Client : Ubuntu
 
Configure SSH Client for Ubuntu.
[2] Install SSH Client.
root@client:~#
apt -y install openssh-client
[3] Connect to the SSH server with a common user.
# ssh [username@hostname or IP address]

root@client:~#
ssh ubuntu@dlp.srv.world

The authenticity of host 'dlp.srv.world (10.0.0.30)' can't be established.
ECDSA key fingerprint is SHA256:fDO2aE2xmT1oXs0Md7iAufnssU6luJo3z7qpiVu0bjE.
Are you sure you want to continue connecting (yes/no/[fingerprint])? cyes
Warning: Permanently added 'dlp.srv.world,10.0.0.30' (ECDSA) to the list of known hosts.
ubuntu@dlp.srv.world's password:
Welcome to Ubuntu 21.04 (GNU/Linux 5.11.0-16-generic x86_64)
.....
.....
ubuntu@dlp:~$    
# just logined

[4] It's possbile to execute commands on remote Host with adding commands to ssh command.
# for example, open [/etc/passwd] on remote host

ubuntu@client:~$
ssh ubuntu@dlp.srv.world "cat /etc/passwd"

ubuntu@dlp.srv.world's password:
root:x:0:0:root:/root:/bin/bash
daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin
bin:x:2:2:bin:/bin:/usr/sbin/nologin
sys:x:3:3:sys:/dev:/usr/sbin/nologin
sync:x:4:65534:sync:/bin:/bin/sync
.....
.....
SSH Client : Windows#1
 
Configure SSH Client for Windows.
[5]
Get a SSH Client for Windows. This example shows to use Putty like follows.
Input your server's IP address and Click [Open] button.
[6] After authentication on SSH server, it's possible to login remotely with SSH.
SSH Client : Windows #2
[7] If your Windows is Windows 10 Version 1803, OpenSSH Client has been implemented as a Windows feature, so it's possible to use ssh command on PowerShell or Command Prompt without Putty and other SSH software.
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