SSH Server : Password Authentication2017/04/19

	Configure SSH Server to manage a server from the remore computer. SSH uses 22/TCP.
[1]	Password Authentication for Open SSH 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 32: uncomment and change to [no]

PermitRootLogin

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 (<no hostip for proxy command>)' can't be established.
ECDSA key fingerprint is xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:60:90:d8.
Are you sure you want to continue connecting (yes/no)?

yes

Warning: Permanently added 'dlp.srv.world' (ECDSA) to the list of known hosts.
ubuntu@dlp.srv.world's password:

# password of the user

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
...
...
ubuntu:x:1000:1000:ubuntu,,,:/home/ubuntu:/bin/bash
sshd:x:108:65534::/var/run/sshd:/usr/sbin/nologin

SSH Client : Windows

	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.

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