Fedora 26
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SSH Server : Password Authentication
2017/07/17
 
Configure SSH Server to login to a server from remote computer.
[1] OpenSSH is already installed by default even if you installed Fedora with [Minimal Install], so it's not necessarry to install new packages. You can login with Password Authentication by default, but change some settings for security like follows.
[root@dlp ~]#
vi /etc/ssh/sshd_config
# line 38: change ( prohibit root login remotely )

PermitRootLogin
no
# line 64: uncomment

PermitEmptyPasswords no
PasswordAuthentication yes
[root@dlp ~]#
systemctl restart sshd

[2] If Firewalld is running, allow SSH service. SSH uses 22/TCP.
[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 a common user.
# ssh [username@(hostname or IP address)]

[root@client ~]#
ssh fedora@dlp.srv.world

The authenticity of host 'dlp.srv.world (127.0.53.53)' 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.
fedora@dlp.srv.world's password:    
# password of the user

[fedora@dlp ~]$    
# just logined
[5] It's possbile to execute commands on remote Host with SSH like follows.
# for example, run [cat /etc/passwd]

[cent@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
...
...
tcpdump:x:72:72::/:/sbin/nologin
fedora:x:1000:1000:fedora:/home/fedora:/bin/bash
SSH Client : Windows
 
Configure SSH Client on Windows.
[6] Get a software which you can login with SSH from Windows clients. This example shows to use Putty. Install and start it and input your server's IP address and Click [Open] button like follows.
[7] After successing authentication, it's possible to login like follows.
 
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