Fedora 31
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OpenSSH : Password Authentication
2019/11/12
 
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 preset>
   Active: active (running) since Mon 2019-11-10 19:02:44 JST; 13min ago
     Docs: man:sshd(8)
           man:sshd_config(5)
 Main PID: 806 (sshd)
    Tasks: 1 (limit: 4675)
   Memory: 3.0M
      CPU: 71ms
   CGroup: /system.slice/sshd.service
           └─806 /usr/sbin/sshd -D -oCiphers=aes256-gcm@openssh.com,chacha20-po>
[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

ssh fedora@dlp.srv.world
The authenticity of host 'dlp.srv.world (10.0.0.30)' can't be established.
ECDSA key fingerprint is SHA256:ouDScYxWvmcjB1RmMFYXngYjgOM0qDSaoJUGryGCV04.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added 'dlp.srv.world,10.0.0.30' (ECDSA) to the list of known hosts.
fedora@dlp.srv.world's password:
Web console: https://dlp.srv.world:9090/ or https://10.0.0.30:9090/

[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
.....
.....
dnsmasq:x:989:989:Dnsmasq DHCP and DNS server:/var/lib/dnsmasq:/usr/sbin/nologin
tcpdump:x:72:72::/:/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 successing authentication, it's possible to login and operate Fedora server from remote computer.
SSH Client : Windows #2
[8] If you are using 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.
[9] It's the same usage because it's the OpenSSH Client, refer to [4], [5] section.
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