OpenSSH : Password Authentication2021/04/29

	Configure SSH Server to operate server from remote computers.
[1]	OpenSSH is already installed by default even if you installed Fedora with Minimal Install, so it does not need to install new packages. You can login with Password Authentication by default.

[root@dlp ~]#

systemctl status sshd

*  sshd.service - OpenSSH server daemon
     Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled; vendor pres>
     Active: active (running) since Thu 2021-04-29 10:06:40 JST; 11min ago
       Docs: man:sshd(8)
             man:sshd_config(5)
   Main PID: 724 (sshd)
      Tasks: 1 (limit: 4664)
     Memory: 2.5M
        CPU: 13ms
     CGroup: /system.slice/sshd.service
             +-- 724 sshd: /usr/sbin/sshd -D [listener] 0 of 10-100 startups
.....
.....

[2]	If Firewalld is running, allow SSH service. SSH uses [22/TCP]. (Generally it is allowed by default)

[root@dlp ~]#

firewall-cmd --add-service=ssh --permanent

success
[root@dlp ~]#

firewall-cmd --reload

success

SSH Client : Fedora

	Configure SSH Client for Fedora.
[3]	Install SSH Client.

[root@client ~]#

dnf -y install openssh-clients

[4]	Connect to SSH server with any common user.

# ssh [username@(hostname or IP address)]

[root@client ~]#

ssh fedora@dlp.srv.world

The authenticity of host 'dlp.srv.world (10.0.0.30)' can't be established.
ED25519 key fingerprint is SHA256:iH/kxud/8mwKn4S0EpC5Lg33wCpiLqRzUC9wo88HZxk.
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.
fedora@dlp.srv.world's password:
[fedora@dlp ~]$   # logined

[5]	It's possbile to execute commands on remote Host with SSH like follows.

# for example, run [cat /etc/passwd]

[fedora@client ~]$

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

fedora@dlp.srv.world's password:

root:x:0:0:root:/root:/bin/bash
bin:x:1:1:bin:/bin:/sbin/nologin
daemon:x:2:2:daemon:/sbin:/sbin/nologin
.....
.....
tcpdump:x:72:72::/:/sbin/nologin
systemd-network:x:985:985:systemd Network Management:/:/usr/sbin/nologin
fedora:x:1000:1000::/home/fedora:/bin/bash

SSH Client : Windows #1

	Configure SSH Client for Windows.
[6]	Download a SSH Client software for Windows. On this example, it shows Putty (www.chiark.greenend.org.uk/~sgtatham/putty/). Install and start Putty, then Input your server's Hostname or IP address on [Host name] field and Click [Open] button to connect.

[7]	After successfully passed authentication, it's possible to login and operate Fedora server from remote computer.

SSH Client : Windows #2

[8]	On Windows 10 version 1803 or later, OpenSSH Client has been implemented as a Windows feature, so it's possible to use [ssh] command on PowerShell or Command Prompt without Putty or other 3rd party SSH softwares. It's the same usage because it's the OpenSSH Client, refer to [4], [5] section.

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