OpenSSH : Password Authentication2023/06/14 |
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Configure SSH Server to manage a server from the remote computer. SSH uses 22/TCP.
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| [1] | Password Authentication for OpenSSH Server on Debian 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. |
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root@dlp:~#
apt -y install openssh-server
root@dlp:~#
vi /etc/ssh/sshd_config # line 33 : uncomment and change to [no] PermitRootLogin no
systemctl restart ssh |
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SSH Client : Debian
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Configure SSH Client for Debian.
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| [2] | Install SSH Client. |
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root@client:~# apt -y install openssh-client
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| [3] | Connect to the SSH server with a common user. |
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# ssh [username@hostname or IP address] debian@client:~$ ssh debian@dlp.srv.world
The authenticity of host 'dlp.srv.world (10.0.0.30)' can't be established.
ED25519 key fingerprint is SHA256:yKjR2T5206zIca4pz1cDMzh4axt9X6RmkrFKwD4dbg0.
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.
debian@dlp.srv.world's password:
Linux dlp.srv.world 6.1.0-9-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.27-1 (2023-05-08) x86_64
The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.
Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
debian@dlp:~$ # just logined |
| [4] | It's possible to execute commands on remote Host with adding commands to ssh command. |
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# for example, open [/etc/passwd] on remote host debian@client:~$ ssh debian@dlp.srv.world "cat /etc/passwd" debian@dlp.srv.world's password: root:x:0:0:root:/root:/bin/bash daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin bin:x:2:2:bin:/bin:/usr/sbin/nologin sys:x:3:3:sys:/dev:/usr/sbin/nologin sync:x:4:65534:sync:/bin:/bin/sync ..... ..... |
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SSH Client : Windows#1
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Configure SSH Client for Windows.
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| [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.
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| [6] | After authentication on SSH server, it's possible to login remotely with SSH. |
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SSH Client : Windows #2
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| [7] | 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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