OpenSSH : Password Authentication2023/12/19

	Configure SSH Server to manage a server from the remote computer. SSH uses 22/TCP.
[1]	The OpenSSH server allows login using password authentication by default, so if the service is enabled, you can log in remotely.

# check the status of sshd

root@dlp:~ #

grep sshd /etc/rc.conf

sshd_enable="YES"

root@dlp:~ #

service sshd status

sshd is running as pid 757.

# if sshd_enable="NO" is set, change it to YES and start the service

root@dlp:~ #

service sshd start

SSH Client : FreeBSD

	How to connect to SSH server from FreeBSD client computer.
[2]	Connect to the SSH server with a common user.

# ssh [username@hostname or IP address]

freebsd@node01:~ $

ssh freebsd@dlp.srv.world

The authenticity of host 'dlp.srv.world (10.0.0.30)' can't be established.
ED25519 key fingerprint is SHA256:oN4KhZb5gSoBCvWBNw3IoayLZMY+jDHNVyun4sF6tOo.
This key is not known by any other names.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added 'dlp.srv.world' (ED25519) to the list of known hosts.
(freebsd@dlp.srv.world) Password for freebsd@dlp.srv.world:
FreeBSD 14.0-RELEASE (GENERIC) #0 releng/14.0-n265380-f9716eee8ab4: Fri Nov 10 05:57:23 UTC 2023

Welcome to FreeBSD!
.....
.....

freebsd@dlp:~ $

# logined

[3]	It's possible to execute commands on remote Host by specifying commands as an argument of the ssh command.

# for example, open [/etc/passwd] on remote host

freebsd@node01:~ $

ssh freebsd@dlp.srv.world "cat /etc/passwd"

(freebsd@dlp.srv.world) Password for freebsd@dlp.srv.world:
root:*:0:0:Charlie &:/root:/bin/sh
toor:*:0:0:Bourne-again Superuser:/root:
daemon:*:1:1:Owner of many system processes:/root:/usr/sbin/nologin
operator:*:2:5:System &:/:/usr/sbin/nologin
bin:*:3:7:Binaries Commands and Source:/:/usr/sbin/nologin
tty:*:4:65533:Tty Sandbox:/:/usr/sbin/nologin
kmem:*:5:65533:KMem Sandbox:/:/usr/sbin/nologin
.....
.....

SSH Client : Windows#1

	Configure SSH Client for Windows.
[4]	Get a SSH Client for Windows. This example shows to use Putty like follows. Input the IP address of your server and Click the [Open] button.

[5]	After successfully authenticated to SSH server, it's possible to login remotely via SSH.

SSH Client : Windows #2

[6]	OpenSSH Client has been implemented as an 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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